Laminate paper, product produced by processing laminate paper, laminate paper producing device, and heat seal roller for laminate paper producing device

Abstract

To provide a product that has high-value-added functions and achieves drastic improvement in performance compared to a conventional one, and a laminate paper producing device.SOLUTION: The laminate paper includes a pair of crepe sheets as outer layer sheets, and a thermally fusible intermediate layer sheet arranged in a laminated state between the pair of crepe sheets. The crepe sheets are thermally fused to the intermediate layer sheet by thermally fusing means, to form rows of linear thermally fused parts extending in a direction orthogonal to a direction in which crepe wrinkles of the crepe sheets extend, thereby thermally fusing the crepe sheets to the intermediate layer sheet, resulting in a laminate structure.SELECTED DRAWING: Figure 16

Description

Technical Field

[0001] The present invention relates to laminated paper, a product obtained by processing the laminated paper, a manufacturing apparatus for the laminated paper, and a heat-sealing roller of the manufacturing apparatus for the laminated paper.

Background Art

[0002] As inventions related to laminated paper that can be used for conventional paper towels and the like, there are the invention according to Patent Document 1 and the invention according to Patent Document 2 related to the inventions or devices of the present inventor. In these inventions, a moisture-absorbing paper having crepe and a heat-fusible sheet (a moisture-absorbing paper or non-woven fabric mixed with synthetic fibers) are laminated, and a heat-set portion or a heat-sealing portion is formed so as to extend in a direction substantially orthogonal to the crepe of the moisture-absorbing paper, and they are heat-fused and integrated. These inventions can provide laminated paper with a good touch, excellent appearance and usability, and also enable heat-sealing of the laminated paper at a low temperature, facilitating processing and reducing manufacturing costs.

[0003] Also, as inventions of the present inventor that further improve the conventional laminated paper having the above excellent effects, there are the invention described in Patent Document 3 and the invention described in Patent Document 4. These inventions can provide laminated paper that significantly improves the fusion strength of the heat-sealing portion of crepe paper and the heat-fusible sheet, increases the overall volume feeling, and further improves the appearance. That is, the laminated paper according to these inventions can obtain sufficient fusion strength even with a reduced fusion area, and can also increase the overall volume feeling.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0005] The inventions of the above Patent Documents 1 to 4 can all significantly improve the texture, appearance, and usability when the laminated paper is embodied in a paper towel or the like. Also, they can significantly improve the adhesion strength between the moisture-absorbing paper and the heat-sealable sheet that constitute the laminated paper, and can significantly increase the overall volume feeling. They mainly exhibit effects related to functions and bring great advantages as products. On the other hand, the inventor considered adding more highly value-added functions to the conventional laminated paper during the process of processing the laminated paper as a material into final products such as paper towels or at a stage after processing, and explored a new laminated paper and its manufacturing method that can leapfrog improve the performance of the laminated paper compared to the prior art. As a result of continuously researching and developing, and repeatedly trying and erring on the laminated paper with such highly value-added functions, improved performance compared to the prior art, the manufacturing method for manufacturing such laminated paper, and the manufacturing apparatus for manufacturing such laminated paper, or the manufacturing apparatus used in such manufacturing method, the present invention was achieved.

[0006] That is, the present invention aims to provide a laminated paper with highly value-added functions and significantly improved performance compared to the prior art, a product obtained by processing the laminated paper, a manufacturing apparatus for the laminated paper, and a heat-sealing roller of the manufacturing apparatus for the laminated paper.

Means for Solving the Problems

[0007] The laminated paper according to the first aspect of the present invention comprises a pair of crepe papers and a non-woven fabric as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers. The crepe papers are heat-sealed to the intermediate layer sheet by a linear heat-sealing portion row extending in a direction orthogonal to the direction in which the crepe wrinkles of the crepe papers extend, forming a laminated structure. The laminated paper sets the crepe rate of the crepe paper within a predetermined crepe rate range and sets the heat-sealing portion interval in the width direction of the heat-sealing portion row within a predetermined heat-sealing portion interval range. The laminated paper sets the crepe rate of the crepe paper to one value of a predetermined crepe rate within the range of 20% to 40% as the predetermined crepe rate range, and sets the heat-sealing portion interval in the width direction of the heat-sealing portion row to one value of a predetermined heat-sealing portion interval within the range of 10 mm to 25 mm as the predetermined heat-sealing portion interval range. The laminated paper has a non-sealed portion between the adjacent heat-sealing portion rows. The non-sealed portion of the laminated paper expands after the laminated paper absorbs water to form an expanded portion, and the expanded portion forms a wide-expanded portion and a narrow-expanded portion. The expanded portion of the laminated paper has expansion wrinkles that are different from the crepe wrinkles of the crepe paper and are larger in size than the crepe wrinkles, and the expansion wrinkles include an expansion large wrinkle that extends substantially throughout the width direction of the wide-expanded portion and an expansion medium wrinkle that extends substantially throughout the width direction of the narrow-expanded portion. The expansion large wrinkle of the laminated paper consists of a first expansion large wrinkle in which some of the crepe wrinkles remain and are mixed with the expansion large wrinkle without disappearing, and a second expansion large wrinkle in which the crepe wrinkles completely disappear. The expansion medium wrinkle of the laminated paper consists of a first expansion medium wrinkle in which some of the crepe wrinkles remain and are mixed with the expansion medium wrinkle without disappearing, and a second expansion medium wrinkle in which the crepe wrinkles completely disappear. The first expansion large wrinkle, the second expansion large wrinkle, the first expansion medium wrinkle, and the second expansion medium wrinkle of the laminated paper remain not only when the laminated paper absorbs water but also after the laminated paper is dried after absorbing water.

[0008] In the product formed by processing the laminated paper according to the second aspect of the present invention, the laminated paper is composed of a pair of crepe papers and a non-woven fabric as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers. The crepe papers are heat-sealed to the intermediate layer sheet by a linear heat-sealing portion row extending in a direction orthogonal to the direction in which the crepe wrinkles of the crepe papers extend, forming a laminated structure. The laminated paper sets the crepe rate of the crepe paper within a predetermined crepe rate range and sets the heat-sealing portion interval in the width direction of the heat-sealing portion row within a predetermined heat-sealing portion interval range. The laminated paper sets the crepe rate of the crepe paper to one value of a predetermined crepe rate within the range of 20% to 40% as the predetermined crepe rate range, and sets the heat-sealing portion interval in the width direction of the heat-sealing portion row to one value of a predetermined heat-sealing portion interval within the range of 10 mm to 25 mm as the predetermined heat-sealing portion interval range. The laminated paper has a non-sealed portion between the adjacent heat-sealing portion rows. The non-sealed portion of the laminated paper expands after the laminated paper absorbs water to form an expanded portion, and as the expanded portion, a wide expanded portion and a narrow expanded portion are formed. The expanded portion of the laminated paper has expansion wrinkles that are different from the crepe wrinkles of the crepe paper and are wrinkles with dimensions larger than the crepe wrinkles. As the expansion wrinkles, there are an expansion large wrinkle extending substantially throughout the width direction of the wide expanded portion and an expansion medium wrinkle extending substantially throughout the width direction of the narrow expanded portion. The expansion large wrinkle of the laminated paper consists of a first expansion large wrinkle in which some of the crepe wrinkles of the crepe paper remain and are mixed with the expansion large wrinkle without disappearing, and a second expansion large wrinkle in which the crepe wrinkles completely disappear. The expansion medium wrinkle of the laminated paper consists of a first expansion medium wrinkle in which some of the crepe wrinkles of the crepe paper remain and are mixed with the expansion medium wrinkle without disappearing, and a second expansion medium wrinkle in which the crepe wrinkles completely disappear. The first expansion large wrinkle, the second expansion large wrinkle, the first expansion medium wrinkle, and the second expansion medium wrinkle of the laminated paper remain not only when the laminated paper absorbs water but also after the laminated paper is dried after absorbing water.

[0009] The laminated paper according to the third aspect of the present invention comprises a pair of crepe papers and a non-woven fabric as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers, and the crepe papers are heat-sealed to the intermediate layer sheet by a linear heat-sealing portion row extending in a direction orthogonal to the direction in which the crepe wrinkles of the crepe papers extend, thereby forming a laminated structure. The laminated paper sets the crepe rate of the crepe paper within a predetermined crepe rate range and sets the heat-sealing portion interval in the width direction of the heat-sealing portion row within a predetermined heat-sealing portion interval range. The laminated paper sets the crepe rate of the crepe paper to one value of a predetermined crepe rate within the range of 20% to 40% as the predetermined crepe rate range, and sets the heat-sealing portion interval in the width direction of the heat-sealing portion row to one value of a predetermined heat-sealing portion interval within the range of 10 mm to 25 mm as the predetermined heat-sealing portion interval range. The laminated paper has a non-sealed portion between the adjacent heat-sealing portion rows. The non-sealed portion of the laminated paper expands after the laminated paper absorbs water to form an expanded portion, and the expanded portion forms a wide expanded portion and a narrow expanded portion. The expanded portion of the laminated paper has an expansion wrinkle that is a wrinkle different from the crepe wrinkles of the crepe paper and is larger in size than the crepe wrinkles, and the expansion wrinkle includes an expansion large wrinkle that extends substantially over the entire width direction of the wide expanded portion and an expansion medium wrinkle that extends substantially over the entire width direction of the narrow expanded portion. The expansion large wrinkle of the laminated paper consists of a first expansion large wrinkle in which some of the crepe wrinkles of the crepe paper remain and are mixed with the expansion large wrinkle without disappearing, and a second expansion large wrinkle in which the crepe wrinkles have completely disappeared. The expansion medium wrinkle of the laminated paper consists of a first expansion medium wrinkle in which some of the crepe wrinkles of the crepe paper remain and are mixed with the expansion medium wrinkle without disappearing, and a second expansion medium wrinkle in which the crepe wrinkles have completely disappeared. The first expansion large wrinkle, the second expansion large wrinkle, the first expansion medium wrinkle, and the second expansion medium wrinkle of the laminated paper remain not only when the laminated paper absorbs water but also after the laminated paper is dried after absorbing water. The laminated paper further has a printing portion.

[0010] In the product formed by folding the laminated paper according to the fourth aspect of the present invention, the laminated paper is composed of a pair of crepe papers and a non-woven fabric as a heat-fusible intermediate layer sheet disposed in a laminated state between the pair of crepe papers. The crepe papers are heat-fused to the intermediate layer sheet by a linear heat-fusion part row extending in a direction orthogonal to the direction in which the crepe wrinkles of the crepe papers extend, forming a laminated structure. The laminated paper sets the crepe rate of the crepe paper within a predetermined crepe rate range and sets the heat-fusion part interval in the width direction of the heat-fusion part row within a predetermined heat-fusion part interval range. The laminated paper sets the crepe rate of the crepe paper to one value of a predetermined crepe rate within the range of 20% to 40% as the predetermined crepe rate range, and sets the heat-fusion part interval in the width direction of the heat-fusion part row to one value of a predetermined heat-fusion part interval within the range of 10 mm to 25 mm as the predetermined heat-fusion part interval range. The laminated paper has a non-fusion part between the adjacent heat-fusion part rows. The non-fusion part of the laminated paper expands after the laminated paper absorbs water to form an expansion part, and the expansion part forms a wide expansion part and a narrow expansion part. The expansion part of the laminated paper has expansion wrinkles that are different from the crepe wrinkles of the crepe paper and are larger in size than the crepe wrinkles, and the expansion wrinkles include an expansion large wrinkle that extends substantially throughout the width direction of the wide expansion part and an expansion medium wrinkle that extends substantially throughout the width direction of the narrow expansion part. The expansion large wrinkle of the laminated paper consists of a first expansion large wrinkle in which some of the crepe wrinkles of the crepe paper remain and are mixed with the expansion large wrinkle without disappearing, and a second expansion large wrinkle in which the crepe wrinkles completely disappear. The expansion medium wrinkle of the laminated paper consists of a first expansion medium wrinkle in which some of the crepe wrinkles of the crepe paper remain and are mixed with the expansion medium wrinkle without disappearing, and a second expansion medium wrinkle in which the crepe wrinkles completely disappear. The first expansion large wrinkle, the second expansion large wrinkle, the first expansion medium wrinkle, and the second expansion medium wrinkle of the laminated paper remain not only when the laminated paper absorbs water but also after the laminated paper is dried after absorbing water. The laminated paper further has a printing part.

[0011] In the paper towel formed by subjecting the laminated paper according to the fourth aspect of the present invention to water-containing processing, the laminated paper comprises a pair of crepe papers and a non-woven fabric as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers, and the crepe papers are heat-sealed to the intermediate layer sheet by a linear heat-sealing portion row extending in a direction orthogonal to the direction in which the crepe wrinkles of the crepe papers extend to form a laminated structure. The laminated paper sets the crepe rate of the crepe paper within a predetermined crepe rate range and sets the heat-sealing portion interval in the width direction of the heat-sealing portion row within a predetermined heat-sealing portion interval range. The laminated paper sets the crepe rate of the crepe paper to one value of a predetermined crepe rate within the range of 20% to 40% as the predetermined crepe rate range, and sets the heat-sealing portion interval in the width direction of the heat-sealing portion row to one value of a predetermined heat-sealing portion interval within the range of 10 mm to 25 mm as the predetermined heat-sealing portion interval range. The laminated paper has a non-sealing portion between the adjacent heat-sealing portion rows. The non-sealing portion of the laminated paper expands after the laminated paper absorbs water to form an expanded portion, and the expanded portion forms a wide-expanded portion and a narrow-expanded portion. The expanded portion of the laminated paper has expansion wrinkles that are different from the crepe wrinkles of the crepe paper and are larger in size than the crepe wrinkles, and the expansion wrinkles include an expansion large wrinkle that extends substantially throughout the width direction of the wide-expanded portion and an expansion medium wrinkle that extends substantially throughout the width direction of the narrow-expanded portion. The expansion large wrinkle of the laminated paper consists of a first expansion large wrinkle in which some of the crepe wrinkles of the crepe paper remain and are mixed with the expansion large wrinkle without disappearing and a second expansion large wrinkle in which the crepe wrinkles completely disappear. The expansion medium wrinkle of the laminated paper consists of a first expansion medium wrinkle in which some of the crepe wrinkles of the crepe paper remain and are mixed with the expansion medium wrinkle without disappearing and a second expansion medium wrinkle in which the crepe wrinkles completely disappear. The first expansion large wrinkle, the second expansion large wrinkle, the first expansion medium wrinkle, and the second expansion medium wrinkle of the laminated paper remain not only when the laminated paper absorbs water but also after the laminated paper is dried after absorbing water. The laminated paper further has a printing portion.

Advantages of the Invention

[0012] According to the laminated paper of the present invention, a product obtained by processing the laminated paper, a manufacturing apparatus for the laminated paper, and a heat-sealing roller of the manufacturing apparatus for the laminated paper, it is possible to provide a laminated paper and a product obtained by processing the laminated paper that have functions with high added value and have a dramatically improved performance compared to the prior art.

Brief Description of the Drawings

[0013]

Figure 1

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Figure 16

Embodiments for Carrying Out the Invention

[0014] Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described. Throughout the embodiments, the same members, elements, or parts are denoted by the same reference numerals, and the description thereof will be omitted.

[0015] Embodiment 1 (Laminated paper having a printing portion provided on a nonwoven fabric) [Overall Configuration of Laminated Paper] The laminated paper of Embodiment 1 is embodied in a laminated paper 10 having a printing portion, as shown in FIGS. 1 to 5. First, the overall configuration of the laminated paper 10 will be described. As shown in FIG. 1, in a plan view (or bottom view) of the laminated paper 10, the laminated paper 10 is formed in a sheet shape having a predetermined outer contour (typically, a rectangular shape such as a rectangular shape). On the other hand, in a side view (or cross-sectional view) of the laminated paper 10, as shown in the side view of FIG. 4, the laminated paper 10 includes a crepe paper 1 as an outer layer sheet constituting a pair of outer layers and a non-woven fabric 2 as an intermediate layer sheet constituting an intermediate layer interposed between the pair of outer layers. It has a laminated structure. Further, the laminated paper 10 maintains the laminated structure by thermally fusing one and the other of the pair of crepe papers 1 to the same location on one and the other surfaces of the non-woven fabric 2, respectively. That is, the laminated paper 10 thermally fuses the pair of crepe papers 1 to the non-woven fabric 2 at each location of the first heat fusion portion 11a and the second heat fusion portion 11b that respectively constitute the heat fusion portion row 11 (the first heat fusion portion row 11A and the second heat fusion portion row 11B), thereby thermally fusing the pair of crepe papers 1 to the non-woven fabric 2 at the same location respectively.

[0016] [Heat fusion portion] Regarding the heat-sealing part 11 in detail, the laminated paper 10 forms a heat-sealing part row 11 in a broken line shape so as to extend over the entire length direction of the laminated paper 10 (the raw paper supply direction during manufacturing, which is the vertical direction in FIG. 1), constituting a row of heat-sealing parts 11 rows. Further, the laminated paper 10 has a plurality of rows of heat-sealing part rows 11 arranged continuously and in parallel with each other at a certain interval over the entire width direction of the laminated paper 10 (the direction orthogonal to the raw paper supply direction during manufacturing, which is the left-right direction in FIG. 1). As a result, the laminated paper 10 has non-sealing parts 12 in a linear band shape between adjacent heat-sealing part rows 11. That is, the laminated paper 10 has a plurality of rows of non-sealing parts 12 arranged continuously and in parallel with each other at a certain interval over the entire width direction. In the laminated paper 10, the plurality of rows of heat-sealing part rows 11 are composed of a first row of heat-sealing part rows 11A formed by arranging the first heat-sealing parts 11a linearly at a certain interval in the length direction of the laminated paper 10, and a second row of heat-sealing part rows 11B formed by arranging the second heat-sealing parts 11b linearly at a certain interval in the length direction of the laminated paper 10. That is, the first row of heat-sealing part rows 11A composed of the first heat-sealing parts 11a and the second row of heat-sealing part rows 11B composed of the second heat-sealing parts 11b are arranged alternately and in parallel at a certain interval in the width direction of the laminated paper 10. Also, as shown in FIG. 2, the first heat-sealing part 11a constitutes a fused portion in a linear segment shape having a predetermined length and a predetermined width in the laminated paper 10. By arranging such first heat-sealing parts 11a having a certain length and a certain width linearly at a certain interval in the length direction, a broken-line-shaped first row of heat-sealing part rows 11A is formed. The second heat-sealing part 11b constitutes a fused portion in a linear segment shape having the same length and the same width as the first heat-sealing part 11a. By arranging such second heat-sealing parts 11b having a certain length and a certain width linearly at a certain interval in the length direction, a second row of heat-sealing part rows 11B having the same broken-line shape as the first row of heat-sealing part rows 11A is formed.Then, the first heat-sealing part 11a of the heat-sealing part row 11A in the first column and the second heat-sealing part 11b of the heat-sealing part row 11B in the second column (that is, the heat-sealing part rows 11A and 11B in adjacent columns) are arranged such that the center position in the length direction of the first heat-sealing part 11a of the heat-sealing part row 11A in the first column comes to the middle position of the gap between the adjacent second heat-sealing parts 11b of the heat-sealing part row 11B in the second column, with their positions in the length direction of the laminated paper 10 shifted from each other.

[0017] [Non-heat-sealing part] As shown in FIG. 4, the laminated paper 10 forms a non-fusion part 12 in a straight strip shape between two adjacent rows of heat-sealing parts 11. This non-fusion part 12 expands after absorbing water into the laminated paper 10 to form an expanded part. Specifically, as shown in FIGS. 1 and 2, the non-fusion part 12 is composed of a wide-expanded part 12a (which will form a wide-expanded part after the laminated paper 10 absorbs water) and a narrow-expanded part 12b (which will form a narrow-expanded part after the laminated paper 10 absorbs water). More specifically, the wide-expanded part 12a is provided on the laminated paper 10 as a substantially rectangular part having the length of the non-overlapping range and the width of the non-overlapping range in a range where the adjacent first row of heat-sealing part rows 11A and the second row of heat-sealing part rows 11B do not overlap (non-overlapping range). For example, in FIG. 2, the wide-expanded part 12a is in the range of the middle part in the length direction where the first heat-sealing part 11a of the first row of heat-sealing part rows 11A in the second column from the left and the second heat-sealing part 11b of the second row of heat-sealing part rows 11B in the third column from the left do not overlap with each other. It is in the length range between the ends (between one end and the other end) of the first heat-sealing part 11a adjacent vertically in the first row of heat-sealing part rows 11A, and extends over the width range from the right edge of the first row of heat-sealing part rows 11A to the left edge of another first row of heat-sealing part rows 11A (in the case of FIG. 2, the first row of heat-sealing part rows 11A in the fourth column from the left) facing the second row of heat-sealing part rows 11B across the second row of heat-sealing part rows 11B, and is provided in a substantially rectangular shape. On the other hand, the narrow-expanded part 12b is provided on the laminated paper 10 as a small substantially rectangular part having the length of the overlapping range and the width of the overlapping range in a range where the adjacent first row of heat-sealing part rows 11A and the second row of heat-sealing part rows 11A overlap (overlapping range). For example, in FIG. 2, the narrow-expanded part 12b is in the range of the end part in the length direction where the first heat-sealing part 11a of the first row of heat-sealing part rows 11A in the second column from the left and the second heat-sealing part 11b of the second row of heat-sealing part rows 11B in the third column from the left overlap with each other. It is in the length range from one end (for example, the upper end) of the first heat-sealing part 11a of the first row of heat-sealing part rows 11A to the other end (lower end) of the second heat-sealing part 11b of the second row of heat-sealing part rows 11B adjacent to it, and extends over the width range from the right edge of the first row of heat-sealing part rows 11A to the left edge of the second row of heat-sealing part rows 11B, and is provided in a substantially rectangular shape.

[0018] [Wrinkles of the non-fused part (expansion part)] In the laminated paper 10, in the non-fused part 12, the outer crepe paper 1 and the intermediate non-woven fabric 2 are not joined at all. The non-fused part 12 of the crepe paper 1 is a part that is not restricted by the heat-fused parts 11a and 11b of the heat-fused part row 11 (that is, a part that is not fixed to the non-woven fabric 2), and can move and deform in the thickness direction and the like with respect to the non-woven fabric 2. In particular, in the part of the non-fused part 12 close to the heat-fused part row 11 (that is, the boundary part with the heat-fused part row 11), the amount of movement of the crepe paper 1 is relatively small, but in the part of the non-fused part 12 where the separation amount from the heat-fused part row 11 is large (that is, the central part between adjacent heat-fused part rows 11), the amount of movement of the crepe paper 1 is relatively large, and the amount of movement of the crepe paper 1 is the largest at the central position between adjacent heat-fused part rows 11. Further, in the laminated paper 10, in each non-fused part 12 of the crepe paper 1 that forms both outer layers (that is, each wide expansion part 12a and each narrow expansion part 12b), a large number of crepe wrinkles, which are the original inherent small wrinkles of the crepe paper 1, appear before the first water absorption of the laminated paper 10. These crepe wrinkles are small wrinkles extending in the width direction of the laminated paper 10 (and the width direction of the crepe paper 1), and are formed during the manufacture of the crepe paper 1.

[0019] (Division candidate) On the one hand, after the first water content addition to the laminated paper 10, in each non-fused portion 12 (wide expansion portion 12a and narrow expansion portion 12b) of the crepe paper 1, the crepe paper 1 expands through the crepe wrinkles, that is, the crepe wrinkles which are small wrinkles expand due to moisture. As shown in FIG. 2, wrinkles different from the original crepe wrinkles of the crepe paper 1 (wrinkles having a larger dimension than the crepe wrinkles, hereinafter referred to as "expansion wrinkles") are formed. In this case, in the crepe paper 1, a plurality of adjacent crepe wrinkles expand due to moisture and integrate, and one expansion wrinkle corresponding to these plurality of crepe wrinkles is formed. And in the expansion wrinkle portion, it can be considered that all or part of the crepe wrinkles that are the origin of the expansion wrinkle disappear. Further, the expansion wrinkles of this crepe paper 1 become large wrinkles (hereinafter referred to as "expansion large wrinkles") extending substantially over the entire width direction of the wide expansion portion 12a in the wide expansion portion 12a, and become medium-sized wrinkles (hereinafter referred to as "expansion medium wrinkles") extending substantially over the entire width direction of the narrow expansion portion 12b in the narrow expansion portion 12b. Both the expansion large wrinkles and the expansion medium wrinkles are larger than the crepe wrinkles. Note that FIG. 14 shows examples of these expansion large wrinkles 12aw and expansion medium wrinkles 12bw. Furthermore, in the non-fused portion 12 of the crepe paper 1, not all the crepe wrinkles are deformed into the expansion large wrinkles or the expansion medium wrinkles, and some crepe wrinkles remain in the crepe paper 1 as they are (in the state of the original small wrinkles). In addition, the inventor has conceived that in the laminated paper 10, in the non-fused portion 12 of the crepe paper 1, there are two types of expansion large wrinkles in the expansion large wrinkles of the wide expansion portion 12a. That is, the inventor has obtained the knowledge that as the expansion large wrinkles, there are a first type of expansion large wrinkles (hereinafter referred to as "large-small mixed wrinkles") in which some of the crepe wrinkles remain (i.e., are mixed) together with the expansion large wrinkles without disappearing, and a second type of expansion large wrinkles (hereinafter referred to as "complete large wrinkles") in which the crepe wrinkles completely disappear. Similarly, the inventor has conceived that in the laminated paper 10, in the non-fused portion 12 of the crepe paper 1, there are two types of expansion medium wrinkles in the expansion medium wrinkles of the narrow expansion portion 12b. That is, the inventor has obtained the knowledge that as the expansion medium wrinkles, there is a first type of expansion medium wrinkles (hereinafter referred to as "medium-small mixed wrinkles") in which some of the crepe wrinkles remain (i.e., are mixed) together with the expansion medium wrinkles without disappearing.) and the finding that there exists a second type of swelling wrinkles during inflation in which the crepe wrinkles have completely disappeared (hereinafter referred to as "complete intermediate wrinkles"). Furthermore, in the laminated paper 10, in the crepe paper 1, these swelling large wrinkles, swelling intermediate wrinkles, large-small mixed wrinkles, medium-small mixed wrinkles, complete large wrinkles, and complete intermediate wrinkles basically remain in the same state even after the laminated paper 10 dries after being hydrated.

[0020] As a result, in the laminated paper 10 after being hydrated, both during hydration and during drying after hydration, the swelling large wrinkles, swelling intermediate wrinkles, large-small mixed wrinkles, medium-small mixed wrinkles, complete large wrinkles, and complete intermediate wrinkles coexist. In particular, the combination of the swelling large wrinkles, large-small mixed wrinkles, and complete large wrinkles, as well as the combination of the swelling intermediate wrinkles, medium-small mixed wrinkles, and complete intermediate wrinkles, alternately exist in the wide swelling portion 12a and the narrow swelling portion 12b respectively, and exhibit a unique effect of increasing the volume balance well over the entire surfaces of both sides of the laminated paper 10.

[0021] [Dimensions of the heat-sealing portions and intervals between the heat-sealing portions] In the laminated paper 10, each row of heat-sealing portion rows 11 is constituted by arranging linear first heat-sealing portions 11a having a certain length and a certain width in a broken line shape at a certain interval in the length direction, and also by arranging linear second heat-sealing portions 11b having a certain length and a certain width in a broken line shape at a certain interval in the length direction while shifting the position with respect to the first heat-sealing portions 11a (that is, so that the intermediate position of each second heat-sealing portion 11b coincides with the intermediate position of the intervals between the first heat-sealing portions 11a). Also, since the lengths and widths of the first heat-sealing portions 11a and the second heat-sealing portions 11b are set to be the same respectively, the first heat-sealing portions 11a and the second heat-sealing portions 11b have the same configuration except for the point that they are arranged with their positions shifted in the length direction as described above. On the other hand, in the laminated paper 10, the lengths and widths of the first heat-sealing portions 11a and the second heat-sealing portions 11b are set to a predetermined length and a predetermined width. That is, the lengths and / or widths of each of the first heat-sealing portions 11a and each of the second heat-sealing portions 11b are appropriately set according to the outer dimensions of one sheet during the use of the laminated paper 10, etc. (that is, appropriately set according to the vertical dimensions, horizontal dimensions, etc. determined according to the use of the laminated paper 10).

[0022] Specifically, for example, when the laminated paper 10 is used for a paper towel application, the length of each heat-sealing portion 11a, 11b is set to an arbitrary value within the range of 35 mm to 45 mm, preferably set to an arbitrary value within the range of 38 mm to 42 mm, and more preferably set to a value of about 40 mm. Also, the width of each heat-sealing portion 11a, 11b is set to an arbitrary value within the range of 1.5 mm to 2.5 mm, preferably set to a value of about 2 mm. And the ratio (aspect ratio) of the length to the width of each heat-sealing portion 11a, 11b is preferably set to an arbitrary ratio within the range of 13:1 to 23:1, and more preferably set to about 20:1. That is, it is preferable to set the width of each heat-sealing portion 11a, 11b to about 5% of the length (or set the length to about 20 times the width). Further, in each row of heat-sealing portions 11 of the laminated paper 10, the interval between the heat-sealing portions 11A, 11b adjacent in the length direction (hereinafter referred to as the "interval between heat-sealing portions in the length direction") is set to an arbitrary value within the range of 18 mm to 22 mm, preferably set to a value of about 20 mm. It is preferable to set the ratio of the length of each heat-sealing portion 11a, 11b to the interval between heat-sealing portions to 2:1. That is, for each row of heat-sealing portions 11, it is preferable to set the interval between heat-sealing portions in the length direction to about 50% of the length of the heat-sealing portions 11a, 11b (or set the length of the heat-sealing portions 11a, 11b to about 2 times the interval between heat-sealing portions). By doing so, while maintaining the integral bonding force between the crepe paper 1 and the non-woven fabric 2 by the heat-sealing portion row 11, the expansion rate of the crepe 1 by the non-sealing portion 12 can be maximally increased, and the volume feeling of the laminated paper 10 can be maintained in the best state.

[0023] [End Shape of Heat-Sealing Portion] Furthermore, both ends of each heat-sealing part 11a, 11b in its longitudinal direction are formed into a planar semi-circular curved shape. This can effectively prevent the crepe paper 1 from peeling off from the ends of each heat-sealing part 11a, 11b with respect to the non-woven fabric 2 as compared with the case where the ends of each heat-sealing part are rectangular (i.e., the corners at the ends are right-angled corners). Also, as will be described later, in this case, both ends in the longitudinal direction of the heat-pressing surface of the heat-pressing convex part of the heat-sealing roller that constitutes the forming means of the heat-sealing part in the laminated paper manufacturing apparatus also have a corresponding planar semi-circular curved shape. Therefore, as compared with the case where the ends of each heat-pressing surface are rectangular (i.e., the corners at the ends are right-angled corners), when forming the heat-sealing part by the heat-pressing surface of the heat-sealing roller, the raw material sheet of the crepe paper 1 that receives the pressing force from the heat-pressing surface will not be damaged due to excessive pressure concentration at the ends of the heat-pressing surface, and the manufacturing yield can be improved, and the quality of the laminated paper 10 can be improved. (That is, as will be described later, when the ends of the heat-pressing surface are right-angled corners, compared with the case where the heat-pressing surface has a curved shape, stress concentrates on the raw material sheet of the crepe paper 1 at the corners, and the possibility of the raw material sheet being damaged at the corner parts increases.)

[0024] [Crepe ratio of crepe paper] In the laminated paper 10, the crepe ratio of the crepe paper 1 is set to an arbitrary value within the range of 20% to 40%, preferably set to an arbitrary value within the range of 20% to 30%, and more preferably set to a value of about 30%. That is, when the crepe ratio of the crepe paper 1 is less than 20%, after being laminated and joined to the non-woven fabric 2 to form the laminated paper 10, when the laminated paper 10 contains water, the crepe paper 1 is very likely not to expand or swell sufficiently. On the other hand, when the crepe ratio of the crepe 1 is greater than 40%, it becomes difficult to form the raw material sheet of the crepe paper 1 (i.e., at the time of papermaking) by the paper-making machine.

[0025] [Crepe ratio of crepe paper and arrangement interval of heat-sealing parts] Also, as shown in FIG. 14, in the laminated paper 10, the arrangement intervals LW1 and LW2 of the heat-sealing part rows 11 (that is, the interval between the center lines in the width direction of adjacent heat-sealing part rows 11, hereinafter referred to as the "interval between heat-sealing parts in the width direction") are set to arbitrary values within a predetermined range according to the range of the crepe rate of the crepe paper 1. Specifically, when the crepe rate of the crepe paper 1 is within the range of 20% to 26%, the interval between heat-sealing parts in the width direction is set as the first interval between heat-sealing parts in the width direction LW1 (which is a relatively small dimension), and it is preferably set to an arbitrary value within the range of 10 mm to 15 mm (that is, it is preferable that the lower limit value is 10 mm and the upper limit value is 15 mm). Also, within this range of the interval between heat-sealing parts in the width direction, it is preferable to increase the interval between heat-sealing parts in the width direction in proportion to the increase in the crepe rate. Further, when the crepe rate of the crepe paper 1 is within the range of 26% to 30%, the interval between heat-sealing parts in the width direction is set as the second interval between heat-sealing parts in the width direction LW2 (which is a relatively large dimension), and it is preferably set to an arbitrary value within the range of 15 to 25 mm (that is, it is preferable that the lower limit value is 15 mm and the upper limit value is 25 mm). Also, within this range of the interval between heat-sealing parts in the width direction, it is preferable to increase the interval between heat-sealing parts in the width direction in proportion to the increase in the crepe rate. If the interval between heat-sealing parts in the width direction LW1 and LW2 in the laminated paper 10 is smaller than the lower limit value, when the laminated paper 10 contains water, there is a high possibility that the crepe paper 1 will not expand or swell sufficiently. On the other hand, if the interval between heat-sealing parts in the width direction LW1 and LW2 in the laminated paper 10 is larger than the upper limit value, when water is contained in the laminated paper 10, the expansion large wrinkles, expansion middle wrinkles, etc. will expand or elongate excessively compared to the expected expansion rate, and slack will occur in these expansion large wrinkles, expansion middle wrinkles, etc., which may reduce the quality of the laminated paper 10. For example, when the interval between heat-sealing parts in the width direction LW1 and LW2 in the laminated paper 10 is 30 mm or more (that is, a value larger than 25 mm, specifically, a value that is 125% or more of 25 mm), the inventor has confirmed by experiments that when water is contained in the laminated paper 10, the expansion large wrinkles, expansion middle wrinkles, etc. will expand or elongate too much and become a slack state.That is, even if the crepe rate of the crepe paper 1 is set to 30%, which is the maximum value within the above range, when the intervals LW1 and LW2 of the heat-sealed portions in the width direction of the laminated paper 10 are set to a value of 30 mm or more in the laminated paper 10, when water is contained in the laminated paper 10, the expansion large wrinkles, expansion medium wrinkles, etc. expand or elongate too much and become a slack state.

[0026] [Pattern portion as a printing portion] As shown in FIG. 1, the laminated paper 10 can be embodied as a laminated paper 10 having a pattern portion 13 as a first specific example of a printing portion. Specifically, for example, as shown in FIG. 2, the pattern portion 13 can be configured by arranging unit patterns 13a and 13b of the same motif over the entire surface or a certain range of the laminated paper 10. In FIG. 2, for example, the unit pattern 13a constitutes a pattern of a predetermined size with the motif of the corolla (aggregate of petals) of a predetermined type of flower, while the unit pattern 13b constitutes a pattern of a size larger than that of the unit pattern 13a with the motif of the same corolla as the unit pattern 13a. Note that the configuration of the pattern portion 13 is not limited to that shown in FIG. 2, and can be a configuration using any pattern. That is, the pattern portion 13 can use unit patterns of motifs different from the unit patterns 13a and 13b in FIG. 2, and in addition to those using unit patterns of the same motif, can be any pattern formed by combining unit patterns of various motifs. Alternatively, the pattern portion 13 can have a configuration using a pattern consisting of a repeating pattern such as a lattice pattern or a checkered pattern, in addition to the configuration using individual unit patterns as shown in FIG. 2. Alternatively, the pattern portion 13 can be a single-color pattern (entire surface single-color pattern) formed by printing an arbitrary single color different from the original base color of the laminated paper 10 (particularly, the base color of the crepe paper 1) over the entire surface of the laminated paper 10, or a single-color pattern (partial single-color pattern) formed by printing an arbitrary single color different from the original base color of the laminated paper 10 over a partial range of the laminated paper 10. Alternatively, the pattern portion 13 can be a pattern (hereinafter referred to as a "multi-color pattern") formed by randomly printing two or more different colors over the entire surface or a partial range of the laminated paper 10. In short, the pattern portion 13 can have any configuration as long as it can impart a distinct visual effect to the laminated paper 10 by printing an arbitrary color different from the normal base color of the laminated paper 10 on the laminated paper 10.

[0027] [Advertising department as the printing department] Also, as shown in FIG. 3, the laminated paper 10 can be embodied as a laminated paper 10 having an advertising department 14 as a second specific example of the printing department. Specifically, the advertising department 14 can have, for example, an advertising frame 14b and an advertising frame 14c within the inner range of the outer frame 14a. In this case, the advertising department 14 can be configured such that, for example, the title, copy, etc. of specific advertising content are printed on the advertising frame 14b, and the details of the advertising content (product description text, pattern corresponding to the product, etc.) are printed on the advertising frame 14c. In FIG. 3, the outer frame 14a, the advertising frame 14b, and the advertising frame 14c of the advertising department 14 each have an outer contour line drawn by a dashed line, but this is merely for convenience in explaining the ranges of the outer frame 14a, the advertising frame 14b, and the advertising frame 14c (of course, it is also possible to draw them deliberately), but usually, the outer contour lines of the outer frame 14a, the advertising frame 14b, and the advertising frame 14c are not drawn on the laminated paper 10. Also, the outer frame 14a of the advertising department 14 is also provided for convenience in showing an example of the advertising content, and it is also possible to embody everything as advertising frames 14a and 14b without providing the outer frame 14a. Also, the number of advertising frames 14a and 14b can be one frame or any number of two or more frames. Furthermore, the configuration of the advertising department 14 is not limited to that in FIG. 2 and can be any configuration. That is, the advertising department 14 can be configured as printing any advertising content and content in any expression mode and expression form as long as it is advertising content printed on advertising printing media such as ordinary flyers and promotional items. Also, as the content and content to be printed on the advertising department 14, any thing such as a company name, a logo mark, a brand, etc. can be printed. Furthermore, the laminated paper 10 provided with the printing department can be applied to novelty goods such as paper hand towels that are distributed in large quantities for the purpose of informing or advertising various information such as sale information of retail stores and campaign information of companies, or can be applied to novelty goods such as paper hand towels that are distributed in large quantities for the purpose of informing or publicizing various events (functions) such as the Olympics and expositions.

[0028] [Structure of the printing department] Next, the structure of the printed portion of the laminated paper 10 will be described. As shown in the specific examples of FIGS. 5, 6, 7, and 8, one of the main features of the laminated paper 10 is that a printing portion is printed using a predetermined printing ink on one surface that is inside the laminated paper 10 and is other than the outer surface of the crepe paper 1 as the outer layer sheet. In addition to this, the laminated paper 10 is configured such that even when the laminated paper 10 is dried, the printed portion is visible from the outside through the crepe paper 1 of the outer layer sheet of the laminated paper 10, and when the laminated paper 10 is wetted, the degree of transmission from the crepe 1 as the outer layer sheet of the printed portion increases and the visibility from the outside increases. Thus, at least the thickness (basis weight) of the crepe paper 1 as the outer layer sheet on the side where the printed portion is provided is set, and if necessary, the material (paper quality) is also set together with the thickness, which is another main feature. Specifically, in Embodiment 1, the laminated paper 10 has a laminated structure of a multi-layer structure (a multi-layer structure of three or more layers) composed of a pair of crepe papers 1 as the outer layer and one or more non-woven fabrics 2 disposed in a laminated state between the pair of crepe papers 1. As an inner surface thereof (that is, as an inner surface of the laminated paper 10), the printing portion is provided on the surface of the non-woven fabric 2 facing one of the crepe papers 1 as the outer layer sheet, and the crepe paper 1 is heat-sealed and pressure-bonded to the non-woven fabric 2 by the heat-sealing portion 1 and adhered thereto.

[0029] [Printing portion provided on non-woven fabric] For example, as shown in FIG. 5, the printing section is composed of a printing layer 2a provided on one surface (one side in the thickness direction) of the non-woven fabric 2 as the intermediate layer sheet. That is, the non-woven fabric 2 of the laminated paper 10 is configured as an intermediate layer sheet made of a material capable of printing on the printing section, and a desired pattern section 13 and advertisement section 14 are provided by printing using a predetermined printing ink on one surface of the non-woven fabric 2, thereby constituting the printing section. In FIG. 5, for the sake of convenience of explanation, the printing layer 2a is depicted as a thin layer on one surface of the non-woven fabric 2. However, in reality, the printing ink constituting the printing layer 2a penetrates from one surface of the non-woven fabric 2 into the interior of the non-woven fabric 2 during printing to form a predetermined pattern or the like of the printing section. Therefore, there may be a case where the printing ink completely penetrates into the interior of the non-woven fabric 2 and no layer of the printing ink is formed on one surface of the non-woven fabric 2, or a case where part of the printing ink penetrates into the interior of the non-woven fabric 2 while a layer of the remaining printing ink is formed on one surface of the non-woven fabric 2. Also, after the printing ink completely penetrates into the interior of the non-woven fabric 2, it may be exposed from the other surface of the non-woven fabric 2, and a layer of the printing ink may also be formed on the other surface of the non-woven fabric 2. In any case, the printing section of the laminated paper 10 is drawn with the highest density on one surface of the non-woven fabric 2 that serves as the printing surface and is visually recognized as the printing layer 2a. That is, the above-described pattern section 13 and advertisement section 14 of various laminated papers 10 are provided by printing on one surface of the non-woven fabric 2 using an arbitrary printing ink and an arbitrary printing method according to the configuration of the pattern, the advertisement content, and the like.

[0030] [Configuration of Printing Layer (Printing Ink and Printing Method)] Here, the printing layer 2a of the printed portion of the laminated paper 10 is formed on one surface of the non-woven fabric 2 using any printing ink by any printing method. Preferably, the printed portion is formed using flexographic printing technology as the printing method, and the printing ink is an aqueous ink or a UV (ultraviolet curable) ink. Specifically, flexographic printing is a type of relief printing of the direct transfer method, which uses rubber or synthetic resin as the plate material and a liquid ink composed of aqueous ink or UV ink as the printing ink. The printing layer 2a of the printed portion of the laminated paper 10 is formed by printing a predetermined pattern portion 13 or advertisement portion 14 on one surface of the non-woven fabric 2 after adjusting the concentration of the aqueous ink or UV ink to form the printed portion. The laminated paper 10 is formed by interposing the non-woven fabric 2 having this printed portion between a pair of crepe papers 1 and integrally thermally fusing them with a thermally fused portion row 11. Even when the printing target of the printed portion is the non-woven fabric 2 having a fine uneven surface on the surface, the desired pattern portion 13 and advertisement portion 14 can be clearly printed as the printed portion by a plate having the elasticity and shape followability of flexographic printing. As a result, in the laminated paper 10 manufactured using the non-woven fabric 2 having the printed portion, especially in its wet state, the printed portion is visually recognized from the outside with good print quality through the crepe paper 1. Further, since the printing ink of the printed portion of the non-woven fabric 2 of this laminated paper 10 is composed of aqueous ink or UV ink, the printing ink does not contain an organic solvent. As a result, the laminated paper 10 manufactured using the non-woven fabric 2 having the printed portion is not affected by the volatilization of the organic solvent like the printing ink using the organic solvent, and in particular, when applied to sanitary products such as paper towels, it becomes a product friendly to users and the environment. In the printing on the non-woven fabric 2 of the laminated paper 10, for example, a flexographic printing machine capable of printing up to 7 colors is used, and the concentration of the printing ink for each color is adjusted.

[0031] [Material of non-woven fabric] On the other hand, the laminated paper 10 according to Embodiment 1 shown in FIG. 5 uses the non-woven fabric 2 as the intermediate layer sheet, which is made of a material capable of printing on the printing portion, and the crepe paper as the outer layer sheet is surely heat-sealed at the linear heat-sealed portion and is a non-woven fabric made of an adhesive material. Thereby, a pattern portion 13 and an advertisement portion 14 can be provided by printing on one surface of the non-woven fabric 2 that will be disposed on one surface side of the laminated paper 10 (typically, when the laminated paper 10 is applied to a paper towel, it is the one surface side of the laminated paper exposed on the outer surface side of the paper towel, that is, the surface side of the paper towel), and a pair of crepe papers 1 serving as outer layers can be satisfactorily adhered to both surfaces of the non-woven fabric 2 to form a laminated paper 10 having a multi-layer structure (a three-layer structure in the case of FIG. 5).

[0032] [Thickness of non-woven fabric] Also, in the laminated paper 10, as described above, the non-woven fabric 2 as the intermediate layer sheet needs to be a material having both the printability that enables printing on the printing portion and the heat-sealability that enables heat-sealing of the crepe paper. However, in order to have both the printability and the heat-sealability, it is preferable to use a non-woven fabric having a thickness within a predetermined range. Specifically, for example, a conventional non-woven fabric paper towel uses a non-woven fabric having a basis weight of 45 to 70 g / cm2 and formed into a sheet as the raw material sheet. On the other hand, in addition to using a pair of crepe papers 1 and a non-woven fabric 2 as the raw material sheets, the laminated paper 10 of the present embodiment uses, as the non-woven fabric 2, a non-woven fabric having a thickness within an arbitrary value in the range of 2 15 to 25 g / m, preferably having a thickness within an arbitrary value in the range of 2 18 to 22 g / m, more preferably having a thickness within an arbitrary value in the range of 2 18 to 20 g / m, still more preferably having a thickness within an arbitrary value in the range of 2 20 g / m, and most preferably having a thickness of 20 g / m. That is, in the laminated paper 10, if the thickness of the non-woven fabric 2 is greater than 2 25 g / m, the laminated paper 10 may lack flexibility. For example, when the laminated paper 10 is applied to a paper towel or the like, it may give a hard touch feeling to the user of the laminated paper 10. Also, if the thickness of the non-woven fabric 2 is greater than 2If it is larger than that, the strength will become higher than necessary, causing unnecessary cost increases. Further, during the manufacturing process of the laminated paper 10, for example, in the step of heat-sealing the crepe paper 1 to the non-woven fabric 2 with a pair of heat-sealing rollers, when heat is transferred from the heat-sealing roller having a heat source to the non-woven fabric 2 through one of the crepe papers 1, as the thickness of the non-woven fabric 2 increases, the heat transfer efficiency decreases. Therefore, even if the heat-sealing between one of the crepe papers 1 and one surface of the non-woven fabric 2 can be performed well, the heat-sealing between the other crepe paper 1 and the other surface of the non-woven fabric may not be sufficiently performed, and the adhesive strength of the non-woven fabric 2 to the other crepe paper 1 may be insufficient. On the other hand, when the thickness of the non-woven fabric 2 is less than the basis weight of 15 g / m 2 If it is smaller than that, the amount of the thermoplastic resin, which is a material for developing the heat-sealing force contained in the non-woven fabric 2, relatively decreases, and sufficient heat-sealing force may not be obtained when the crepe paper 1 is heat-sealed to both sides of the non-woven fabric 2. Also, the firmness of the entire laminated paper 10 becomes weak. For example, when the laminated paper 10 is applied to a paper towel or the like, it may have an adverse effect on the user experience of the laminated paper 10.

[0033] [Raw fibers of non-woven fabric] Furthermore, as the non-woven fabric 2, when the thickness is set to a value within the above-mentioned predetermined range in order to have both the above-mentioned printability and heat-sealability, particularly when the thickness is set to a value on the lower limit side within the above-mentioned predetermined range (for example, when the thickness is the basis weight of 15 g / m 2 , the basis weight of 18 g / m 2When the value is such as [etc.], it is preferable to use a non-woven fabric made of core-sheath structure composite fibers. That is, when the thickness of the non-woven fabric 2 becomes relatively small (that is, when it becomes a value on the lower limit side within the above-mentioned predetermined range), in the case of such a non-woven fabric with a relatively small thickness, the firmness of the entire laminated paper 10 is likely to become weak. However, by using a non-woven fabric made of core-sheath structure composite fibers, when the crepe paper 1 is heat-sealed to the non-woven fabric 2, the sheath part of the core-sheath structure composite fibers softens or melts at a predetermined heating temperature, and an adhesive force due to heat-sealing is exhibited with respect to the crepe paper 1. On the other hand, the core part of the core-sheath structure composite fibers remains as it is without softening or melting, so as to maintain the strength and firmness of the non-woven fabric 2 itself. Therefore, finally, the strength and firmness of the entire laminated paper 10 can also be maintained, and the volume feeling of the laminated paper 10 can be maintained with the thin non-woven fabric 2.

[0034] [Thickness of crepe paper] In the laminated paper 10, the crepe paper 1 has a thickness of an arbitrary value within a predetermined range to achieve a predetermined transmittance (degree of transparency). Specifically, one crepe paper 1 that is overlapped and joined to one surface of the non-woven fabric 2 (that is, the surface on the side where the printing portion is provided) has a transmittance such that at least a part of the printing portion of the non-woven fabric 2 is visible through the crepe paper 1 in the dry state of the laminated paper 10 (or a transmittance such that at least a part of the printing portion of the non-woven fabric 2 is visible in a semi-transparent state), and at least in the wet state due to the water content of the laminated paper 10, the entire printing portion of the non-woven fabric 2 is clearly visible through the crepe paper 1 (or a transmittance such that the entire printing portion of the non-woven fabric 2 is visible in a substantially transparent state). Its thickness is set accordingly. On the other hand, the other crepe paper 1 that is overlapped and joined to the other surface of the non-woven fabric 2 is usually set to the same thickness as the one crepe paper 1, but can also be set to a different thickness. Even when the other crepe paper 1 has the same thickness as the one crepe paper 1, if the thickness of the non-woven fabric 2 is within the above-mentioned predetermined range, at least a part of the printing portion of the non-woven fabric 2 is still visible through the other crepe paper 1 in the dry state of the laminated paper 10 (although the sharpness is lower than that from the side of the one crepe paper 1), and in the wet state due to the water content of the laminated paper 10, the entire printing portion of the non-woven fabric 2 is somewhat clearly visible through the other crepe paper 1 (although the sharpness is lower than that from the side of the one crepe paper 1). In any case, in the laminated paper 10, the crepe paper 1 is set to a thickness of an arbitrary value within a predetermined range to achieve a predetermined light transmittance (synonymous with light transmittance, hereinafter simply referred to as "transmittance"). As a result, whether viewed from the side of the one crepe paper 1 or from the side of the other crepe paper, at least a part of the printing portion of the non-woven fabric 2 is visible through the crepe paper 1 in the dry state of the laminated paper 10, and in the wet state due to the water content of the laminated paper 10, the entire printing portion of the non-woven fabric 2 is clearly visible to some extent through the crepe paper 1, and a specific effect is exerted.

[0035] Specifically, in the laminated paper 10, the thickness of the crepe paper 1 is set to an arbitrary value within the range of 20 to 50 g / m 2 in terms of basis weight, and more preferably, 20 to 40 g / m 2is set to any value within the range, and more preferably, 30 to 40 g / m 2 is set to any value within the range, and even more preferably, 30 to 35 g / m 2 is set to any value within the range, and still more preferably, 30 to 33 g / m 2 is set to any value within the range or 33 to 35 g / m 2 is set to any value within the range, and most preferably, about 33 g / m 2 or a value of about 35 g / m 2 is set. For example, the thickness of crepe paper 1 is 35 g / m in basis weight 2 , 27 g / m 2 , or 23 g / m 2 can be set. As a result of intensive research on the relationship between the crepe wrinkles of crepe paper 1 and the thickness of crepe paper 1, the inventor has obtained the knowledge that when the thickness of crepe paper 1 is outside the above range, the desired physical properties required for crepe paper 1 of laminated paper 10 cannot be ensured. That is, when the thickness of crepe paper 1 is 20 g / m or less in basis weight 2 , when manufacturing crepe paper 1 using a crepe paper manufacturing apparatus, when the feeding speed of the raw material sheet (paper sheet in a state where no crepe is formed) of crepe paper 1 is increased, it has been found that crepe cannot be formed on the raw material sheet. On the other hand, when the thickness of crepe paper 1 exceeds 50 g / m in basis weight 2 , when trying to laminate crepe paper 1 on nonwoven fabric 2 and thermally fuse it to nonwoven fabric 2 at heat-sealing part 11 to form laminated paper 10, the heat from the pressure-bonding surface of the heat-sealing roller is blocked by the thick crepe paper 1 and does not reach nonwoven fabric 2 sufficiently, the thermoplastic resin as the adhesive of nonwoven fabric 2 does not melt sufficiently, and the desired adhesive force to crepe paper 1 cannot be exhibited, and there is a possibility that crepe paper 1 cannot be adhered to nonwoven fabric 2.

[0036] Also, when the thickness of crepe paper 1 exceeds 40 g / m in basis weight 2 , during manufacturing by a crepe paper manufacturing apparatus, it is necessary to extremely slow down the feeding speed of the raw material sheet to manufacture crepe paper, and there is a possibility that the manufacturing efficiency will decrease. Therefore, from this point, the upper limit of the thickness of crepe paper 1 is 40 g / m2 is preferably set as such. Further, when the thickness of the crepe paper 1 exceeds 35 g / m² in basis weight, even if the feeding speed of the raw material sheet is reduced during the production by the crepe paper manufacturing apparatus, depending on the performance of the crepe paper manufacturing apparatus, the production of the crepe paper itself may become difficult. Therefore, from this aspect, it is preferable that the upper limit of the thickness of the crepe paper 1 is 35 g / m² 2 in basis weight. 2 is preferably set as such.

[0037] [Total thickness of the laminated paper (total thickness of the crepe paper and the non-woven fabric)] As described above, the crepe paper 1 and the non-woven fabric 2, which are components of the laminated paper 10, are each configured to have a thickness of an arbitrary value within a predetermined range, and the total thickness of the laminated paper 10 is determined by the thickness of the crepe paper 1 and the thickness of the non-woven fabric 2. Preferably, the total thickness of the laminated paper 10 is such that the thickness of each crepe paper 1 is 35 g / m² 2 in basis weight, and the thickness of the non-woven fabric 2 is 20 g / m² 2 in basis weight. By setting it like this, the total thickness is (35 + 20 + 35 =) 90 g / m² 2 in basis weight, which is most preferable. When the thickness of the crepe paper 1 is set to this value (35 g / m² 2 ) and the thickness of the non-woven fabric 2 is set to this value (20 g / m² 2 ) and the total thickness of the laminated paper 10 is set to this value (90 g / m² 2 ) when cutting the raw material sheet of the laminated paper 10 (that is, the raw material sheet formed by interposing one non-woven fabric raw material sheet between a pair of crepe paper raw material sheets) at a predetermined feeding position during the production of the laminated paper 10 (that is, cutting the raw material sheet of the laminated paper 10 to a predetermined length according to the purpose of use), the cutting can be performed most favorably, improving the production efficiency and the yield.

[0038] [Effect of the laminated paper having a printing portion] In this way, the laminated paper 10 provided with the printing section has a unique design effect because the printing sections such as the pattern section 13 and the advertisement section 14 have an appearance and look as if they are half-emerged through the crepe paper 1. Specifically, in the dry state of the laminated paper 10, the transmittance (transparency) of the dry crepe paper 1 is relatively low, so the patterns and advertisements of the printing section are in a somewhat visible state although they are unclear through the crepe paper 1. However, in the wet state due to the water content of the laminated paper 10, the transmittance (transparency) of the wet crepe paper 1 is relatively high, so the patterns and advertisements of the printing section are clearly visible through the crepe paper 1, and at the same time, due to the presence of the crepe paper 1, a unique effect is exerted that they are visually recognized as if they are emerging from the laminated paper 10.

[0039] [Effect of the printing section when provided on the nonwoven fabric] Also, as described above, since the laminated paper 10 is configured as described above, it can be provided with a printed portion having a never-before-seen pattern portion 13 and advertisement portion 14. Therefore, for example, compared to simply coloring the raw material fibers (such as pulp) of the raw material sheet of the towel with a single color as in a conventional colored paper towel (a paper towel colored in a single color on the entire surface), the laminated paper 10 becomes a product extremely rich in design due to the pattern portion 13 and advertisement portion 14 as the printed portion. Further, since the laminated paper 10 is formed by sandwiching the non-woven fabric 2 provided with the printed portion between a pair of crepe papers 1, the pattern and advertisement of the printed portion give a soft impression to the viewer when viewed from the outside and exhibit a unique visual effect. In particular, when the laminated paper 10 is applied to sanitary paper products such as paper towels which are the main use, usually, the laminated paper 10 as a sanitary paper product is provided to the user after being wetted by containing water, and the user wipes off dirt on the hand or a part of the body with the wetted laminated paper 10. In this case, it is necessary to prevent the printing ink of the printed portion of the laminated paper 10 from dissolving in water and eluting from the crepe paper 1 and adhering to the user's hand or body. However, in a conventional colored paper towel, since the entire surface is colored with a predetermined single-color printing ink, the printing ink is exposed on the surface of the colored paper towel. Therefore, it is necessary to use an organic solvent type printing ink for the conventional colored paper towel so that the printing ink exposed on the surface does not dissolve and touch the user's hand or skin in a wet state due to containing water. As described above, the influence of the volatile components of the organic solvent cannot be denied.

[0040] On the one hand, as described above, the laminated paper 10 of the present embodiment forms a printed portion on the nonwoven fabric 2 with aqueous ink or UV ink using flexographic printing, and completely covers both sides of the nonwoven fabric 2 with the crepe paper 1 respectively. Therefore, the printing ink of the printed portion is not directly exposed on the surface of the laminated paper 10 and is always kept shielded by the crepe paper 1. Accordingly, even when the laminated paper 10 is used in a wet state when containing water despite having a printed portion, the printing ink does not directly contact the user's hand or skin, and the laminated paper 10 can be provided as a safe and harmless laminated paper for the user, and can be provided as an environmentally friendly laminated paper. Also, for this reason, there is an advantage that it is not necessary to use an organic solvent type printing ink like conventional colored paper towels. Note that as the aqueous ink as the printing ink of the printed portion of the laminated paper 10, it is preferably a pigment type aqueous ink. By doing so, in the wet state when the laminated paper 10 contains water, it is possible to effectively prevent the printing ink of the printed portion of the nonwoven fabric 2 from easily dissolving and eluting to the outside.

[0041] [Manufacturing method of laminated paper having a printed portion (width dimension of nonwoven fabric raw material sheet)] Next, a method for manufacturing the laminated paper 10 having a printing section will be described. Generally, a nonwoven fabric is manufactured by producing a web (also called a fleece) from predetermined raw material fibers made of natural fibers (pulp) or synthetic fibers by a predetermined web forming method such as a dry method, a wet method, or a spunbond method, and binding the fibers of the web by a predetermined binding method such as a chemical bond method, a thermal bond method, a needle punch method, or a water entanglement method. On the other hand, for the laminated paper 10 of the present embodiment, it is preferable to use, as the nonwoven fabric 2, a nonwoven fabric made of the core-sheath structure composite fiber. Further, as the nonwoven fabric 2, it is more preferable to use a nonwoven fabric (hereinafter, for convenience of explanation, referred to as an "air-through nonwoven fabric") manufactured by binding fibers by an air-through method which is a kind of the thermal bond method. This air-through nonwoven fabric has advantages such as being rich in stretchability and flexibility, giving a soft touch to the user and having a good texture, and enabling the manifestation of good adhesive strength even when the crepe paper 1 is heat-sealed to the nonwoven fabric 2. Further details will be described in the section on the manufacturing apparatus for the laminated paper and the manufacturing method for the laminated paper, but in the manufacture of the laminated paper 10, a raw material sheet of the nonwoven fabric 2 (hereinafter referred to as a "nonwoven fabric raw material sheet") is sandwiched between raw material sheets of a pair of crepe papers 1 (hereinafter referred to as "crepe paper raw material sheets") to form a raw material sheet having a three-layer structure (three sheets stacked) (hereinafter referred to as a "laminated raw material sheet"). Then, the laminated raw material sheet is fed between, for example, a pair of heat-sealing rollers, and the pair of crepe paper raw material sheets are heat-sealed to the nonwoven fabric raw material sheet by the pair of heat-sealing rollers and integrated to manufacture the final laminated paper. At this time, the crepe paper raw material sheet and the nonwoven fabric raw material sheet usually have a width direction dimension (for example, a width direction dimension of 1200 mm) which is the same width of a predetermined width. In particular, if the width direction dimension of the nonwoven fabric raw material sheet is smaller than the width direction dimension of the crepe paper raw material sheet, a portion where the crepe paper raw material sheet cannot be heat-sealed to the nonwoven fabric raw material sheet will occur at the width direction end of the laminated raw material sheet. Therefore, it is not preferable for the width direction dimension of the nonwoven fabric raw material sheet to be smaller than the width direction dimension of the crepe paper raw material sheet.

[0042] [Setting the Width Dimension of the Nonwoven Fabric Raw Material Sheet According to the Material of the Nonwoven Fabric] On the other hand, when providing a printing portion on the nonwoven fabric 2 as described above, the nonwoven fabric raw material sheet is fed to a predetermined printing apparatus in advance and a predetermined printing portion is printed on the raw material sheet. However, the inventor has found that when the air-through nonwoven fabric is used as the nonwoven fabric at this time, it is considered to be due to its large elasticity, but the nonwoven fabric raw material sheet shrinks due to the heat during printing. As a result of continuous intensive research on the invention of laminated paper considering this influence, the following configuration was conceived. That is, when forming a printing portion on the laminated paper 10, for example, when forming a printing portion using flexographic printing, when printing a printing portion on a nonwoven fabric raw material sheet 2 having a width of 1200 mm, after printing, the width of the nonwoven fabric raw material sheet shrinks from 1200 mm to 1150 mm (that is, it shrinks to about 96% of the original width), or under other conditions, the width of the nonwoven fabric raw material sheet shrinks from 1300 mm to 1200 mm (that is, it shrinks to about 92% of the original width). The inventor has obtained such findings. The inventor has also tried printing the nonwoven fabric raw material sheet in a state where it is stretched in the width direction (by the amount of shrinkage) in consideration of the shrinkage of the nonwoven fabric raw material sheet during printing, but in this case, it has been found that it becomes difficult to perform the intended printing on the nonwoven fabric raw material sheet. Therefore, in the method for manufacturing the laminated paper 10 having a printing portion, as the nonwoven fabric raw material sheet, in order to compensate for the shrinkage during printing on the nonwoven fabric raw material sheet, a nonwoven fabric raw material sheet having a width dimension that is a predetermined ratio larger than the width of the laminated paper 10 that should actually be obtained is used according to the shrinkage rate (that is, the width dimension of the nonwoven fabric raw material sheet is set so as to be a width that compensates for the shrinkage dimension according to the shrinkage rate).

[0043] The inventor has confirmed through experiments that, for example, when using a non-woven fabric raw material sheet with a width of 1200 mm and printing the printing portion on this non-woven fabric raw material sheet, the non-woven fabric raw material sheet shrinks after printing, and its width becomes 1150 mm (that is, a width 50 mm smaller than the width before printing, or a width approximately 4% smaller than the width before printing). Therefore, in the production of the laminated paper of this embodiment, a non-woven fabric as the base paper with a dimension approximately 4% (about 4.12%) larger than the required dimension after shrinkage is used. For example, when the width of the raw material sheet of the laminated paper is 1200 mm, the width of the crepe paper raw material sheet is the same 1200 mm, but the width of the non-woven fabric raw material sheet is set to a width approximately 4% larger than 1200 mm (for example, a width of 1250 mm).

[0044] [Specific Effect by Setting the Width Dimension of the Non-Woven Fabric Raw Material Sheet] According to the method for manufacturing a laminated paper using a non-woven fabric raw material sheet whose width direction dimension is set as described above (that is, the width direction dimension is set to compensate for the shrinkage rate during printing of the non-woven fabric raw material sheet), the width of the non-woven fabric raw material sheet becomes the same width as the predetermined width of the laminated paper raw material sheet (that is, the predetermined width of the crepe paper raw material sheet) after the printing process of the printing portion. For example, when the predetermined width of the laminated paper raw material sheet (that is, the predetermined width of the crepe paper raw material sheet) is 1200 mm, the width of the non-woven fabric raw material sheet also becomes the same width of about 1200 mm (that is, a width 50 mm smaller than the width before printing, or a width approximately 4% smaller than the width before printing). Therefore, the laminated paper raw material sheet with a three-layer structure formed by laminating this non-woven fabric raw material sheet after printing (width about 1200 mm) in the middle of a pair of crepe paper raw material sheets (width 1200 mm) has the crepe paper raw material sheets as a pair of outer layers and the non-woven fabric raw material sheet as the middle layer, all having the same width, and can be smoothly provided to the manufacturing process of the laminated paper as a laminated paper raw material sheet with a width of 1200 mm. The manufactured laminated paper 10 will also have a width of 1200 mm, which is the desired width.

[0045] Embodiment 2 (Laminated Paper with a Printing Portion Provided on Crepe Paper) [Overall Structure of the Laminated Paper and Structure of the Crepe Paper] As shown in FIG. 5, in the example of Embodiment 1, the laminated paper 10 has a three-layer structure (a superposed structure of three sheets) composed of a pair of crepe papers 1 and one non-woven fabric 2, and a printing layer 2a of a printing portion is provided on the surface of the non-woven fabric 2 as an intermediate layer sheet. However, as shown in FIG. 6, in the laminated paper 10 having a three-layer structure of Embodiment 2, a printing layer 1a of a printing portion is provided on the inner surface of the crepe paper 1 as an outer layer sheet. That is, in Embodiment 2, the laminated paper 10 has a multi-layer structure (a multi-layer structure of three or more layers) composed of a pair of crepe papers 1 as outer layer sheets and one or more non-woven fabrics 2 as intermediate layer sheets disposed in a laminated state between the pair of crepe papers 1. As an inner surface thereof (that is, as an inner surface of the laminated paper 10), the printing portion is provided on the inner surface of one of the crepe papers 1 as an outer layer sheet, and the crepe paper 1 is heat-sealed and pressure-bonded to the non-woven fabric 2 by the heat-sealing portion 1 and adhered. Here, the inner surface of the crepe paper 1 means the surface that comes to the inside of the laminated structure of the laminated paper 10 (that is, the side facing the non-woven fabric 2) when one (or two or more) non-woven fabrics 2 are sandwiched between a pair of crepe papers 1 as outer layer sheets and superposed to form the laminated paper 10 having a laminated structure. Here, both surfaces of the crepe paper 1 are composed of a surface with high smoothness (that is, a relatively smooth surface with a good touch feeling) on one side and a back surface with low smoothness (that is, a relatively rough surface with a granular touch) on the other side. However, in the laminated paper 10 of Embodiment 2, it is preferable to form the above laminated structure with the surface side of the crepe paper 1 as the inner surface side.

[0046] [Specific effects by printing on the inner surface (surface) of the crepe paper] According to the laminated paper 10 of Embodiment 2, when the non-woven fabric 2 is interposed between a pair of crepe papers 1 and the crepe papers 1 are heat-sealed and fixed to the non-woven fabric 2 by the heat-sealing portion 1, the inventor has confirmed by experiments that the crepe paper 1 is adhered to the non-woven fabric 2 more reliably and firmly. In addition, when the printing layer 1a of the printing portion is provided on the inner surface of the crepe paper 1 as in Embodiment 2, since the inner surface of the crepe paper 1 provided with the printing layer 1a (that is, printed with printing ink) becomes the surface with high smoothness, printing of a desired pattern portion 13 or advertisement portion 14 can be performed in a better state, and the printing quality can be further improved. Further, in Embodiment 2, since the printing portion is provided on the inner surface of the crepe paper 1, the printing portion does not come into contact with the fingers or skin of the user, so that the user's uneasiness regarding direct contact with the printing ink is eliminated, and health problems caused by the printing ink can be surely prevented. When a printing portion is provided on the laminated paper 10, in terms of printing quality, it is more preferable to provide the printing portion on the non-woven fabric 2 serving as the intermediate layer (that is, the inner layer) of the laminated paper 10 as in Embodiment 1 than to provide the printing portion on the crepe paper 1 serving as the outer layer of the laminated paper 10 as in Embodiment 2.

[0047] [Thicknesses of each of the crepe paper, non-woven fabric, and laminated paper] In the case of the laminated paper 10 of Embodiment 2, the thickness of the crepe paper 1, the thickness of the non-woven fabric 2, and the overall thickness of the laminated paper 10 can be set in the same manner as in the case of Embodiment 1.

[0048] Embodiment 3 (Laminated paper having a colored portion provided on an intermediate layer sheet) [Overall configuration of the laminated paper and configuration of the non-permeable sheet as the intermediate layer sheet] As shown in Fig. 5, in the example of Embodiment 1, the laminated paper 10 has a three-layer structure, and a printing portion is provided on the surface of the non-woven fabric 2 as the intermediate layer sheet. As shown in Fig. 6, in Embodiment 2, the laminated paper 10 has a three-layer structure, and a printing portion is provided on the inner surface of the crepe paper 1 as the outer layer sheet. However, in Embodiment 3, as shown in Fig. 7, the laminated paper 10 with a three-layer structure in Embodiment 3 is constituted by a non-permeable sheet 5 (for example, a non-water-permeable sheet or a water-resistant sheet) made of a synthetic resin film as the intermediate layer sheet, and a printing layer 5a of the printing portion is provided on the surface of this non-permeable sheet 5. That is, in Embodiment 3, the laminated paper 10 has a multi-layer structure (three-layer structure) composed of a pair of crepe papers 1 as the outer layer sheets and one non-permeable sheet 5 as the intermediate layer sheet disposed in a laminated state between the pair of crepe papers 1. As the inner surface thereof (that is, as the inner surface of the laminated paper 10), the printing portion is provided on the surface of the non-permeable sheet 5, and the crepe paper 1 is heat-sealed and pressure-bonded to the non-permeable sheet 5 by the heat-sealing portion 1 and adhered. As the non-permeable sheet 5, for example, in addition to what is generally called a vinyl sheet or a vinyl film, a resin film or a resin sheet made of a polyvinyl chloride resin, a resin film or a resin sheet made of a polyolefin resin (such as a polyethylene resin or a polypropylene resin), etc. can be preferably used. Further, the thickness of the non-permeable sheet 5 is preferably a predetermined thickness within the range of, for example, 0.1 mm to 0.2 mm. Note that the non-water-permeable sheet as the non-permeable sheet 5 mainly functions to block the permeation of moisture, but the non-permeable sheet may be constituted by a non-permeable sheet (hereinafter referred to as a "non-oil-permeable sheet") that blocks the permeation of oil. Also, in these documents of the present application, when simply referred to as a "non-permeable sheet", in addition to the non-water-permeable sheet, it also includes the non-oil-permeable sheet, and also includes those that block the permeation of other liquids and some gases. That is, in the present invention, the non-permeable sheet may be any sheet-like or film-like synthetic resin sheet that blocks the permeation of moisture and / or oil as the intermediate layer sheet.

[0049] [Unique Effects by Non-Permeable Sheet] According to the laminated paper 10 of Embodiment 3, the non-permeable sheet 5 including a water-impermeable sheet or an oil-impermeable sheet as the intermediate layer sheet blocks the permeation of moisture and oil. Therefore, in addition to typical products such as paper towels, the laminated paper 10 can be applied to wrapping papers and the like for temporarily or permanently wrapping objects and articles to which moisture or oil adheres, and the applications of the laminated paper 10 can be greatly expanded.

[0050] [Scope of the Invention of the Laminated Paper of Embodiments 1 to 3] Incidentally, the invention of the laminated paper 10 of the above-described Embodiments 1 to 3 mainly features that a printing portion is provided on the inner surface side of the laminated paper 10 (the inner surface of the intermediate layer sheet or the outer layer sheet). That is, as long as the laminated paper 10 of the invention of Embodiments 1 to 3 includes such a printing portion, the configurations other than the printing portion (configurations such as the heat-sealing portion) can be different from those of the above-described embodiments. That is, as long as the laminated paper 10 has a multi-layer structure composed of an outer layer sheet and an intermediate layer sheet and includes the printing portion on the inner surface side thereof, the configuration of the heat-sealing portion and the configurations of other elements or parts can be arbitrary configurations. For example, the laminated paper including the printing portion of the present invention can have a wavy shape, a dotted line shape, a chain line shape composed of a chain line such as a one-dot chain line or a two-dot chain line, or a zigzag shape, a staggered shape, etc. instead of a broken line shape as in Embodiment 1 of the above-described embodiments, or can be a linear shape composed of a solid line, or can be embodied as a laminated paper in which dot-shaped heat-sealing portions are scattered. However, in order to obtain a sufficient expansion effect over the entire laminated paper after the laminated paper absorbs water and produce a volume feeling during use, the heat-sealing portion row is preferably a linear shape of a broken line (or a chain line) as in the above-described embodiments.

[0051] [Invention of the Laminated Paper without a Printing Portion] On the other hand, among the configurations of the laminated paper 10 described in the above Embodiment 1, the following configurations have novelty and inventiveness when viewed from the prior art even on their own. That is, in addition to the invention of the laminated paper provided with the printing portion as described above (hereinafter referred to as "the invention of the first laminated paper"), the invention of the laminated paper in which the thickness of the non-woven fabric is within the predetermined range and the thickness of the crepe paper is within the predetermined range (hereinafter referred to as "the invention of the second laminated paper"), and the invention of the laminated paper in which the interval between the heat-sealing portions in the width direction is within the predetermined range according to the crepe ratio of the crepe paper (hereinafter referred to as "the invention of the third laminated paper") have novelty and inventiveness when viewed from the prior art even in themselves (that is, even when not provided with a printing portion).

[0052] [Invention of the second laminated paper (thickness range of crepe paper and thickness range of non-woven fabric)] Specifically, the invention of the second laminated paper comprises crepe paper as a pair of outer layer sheets and a heat-sealable intermediate layer sheet disposed in a laminated state between the crepe papers. The crepe papers are heat-sealed to the intermediate layer sheet by a linear heat-sealing portion row extending in a direction orthogonal to the direction in which the crepe wrinkles of the crepe paper extend to form a laminated structure. Further, the crepe paper has a thickness within the range of 20 to 50 g / m 2 and the non-woven fabric has a thickness within the range of 15 to 25 g / m in terms of basis weight. 2 This is characterized by the above.

[0053] [Invention of the third laminated paper (crepe ratio of crepe paper and interval between heat-sealing portions in width direction)] The invention of the third laminated paper also comprises crepe paper as a pair of outer layer sheets and a heat-sealable intermediate layer sheet disposed in a laminated state between the crepe papers. The crepe papers are heat-sealed to the intermediate layer sheet by a linear heat-sealing portion row extending in a direction perpendicular to the extending direction of the crepe wrinkles of the crepe paper to form a laminated structure. Further, the widthwise heat-sealing portion interval, which is the interval between the center lines in the width direction of adjacent heat-sealing portion rows, is set to an arbitrary value within a predetermined range according to the crepe rate range of the crepe paper. When the crepe rate of the crepe paper is within the range of 20% to 26%, the widthwise heat-sealing portion interval is set within the range of 10 mm to 15 mm. When the crepe rate of the crepe paper is within the range of 26% to 30%, the widthwise heat-sealing portion interval is set within the range of 15 to 25 mm.

[0054] Embodiment 4 (Laminated paper having an improved nonwoven fabric as the intermediate layer sheet) [Configuration of the nonwoven fabric] The laminated paper of the present invention can be embodied as follows, characterized by the configuration of the nonwoven fabric as the intermediate layer sheet. Specifically, in the laminated paper of Embodiment 4, the nonwoven fabric is made of a nonwoven fabric with a high elongation rate. Specifically, as will be described later, it is made of a nonwoven fabric produced using so-called core-sheath structured fibers. That is, conventional nonwoven fabrics are made of so-called pulp nonwoven fabrics, which are produced by aggregating fibrous materials obtained by pulverizing wood pulp into a web shape and joining them to each other to form a sheet-like part. Also, conventional paper towels are generally made of nonwoven fabrics, and as this nonwoven fabric, one with a basis weight of 45 to 70 g / cm2 formed into a sheet is used.

[0055] [Types of the nonwoven fabric of the present invention (types according to the manufacturing method)] In contrast, for example, referring to the cross-sectional view of FIG. 5, the laminated paper 10 of Embodiment 4 can use, as the intermediate layer sheet, a non-woven fabric of the air-through type (manufactured by thermal bonding) containing air. In this way, the laminated paper 10 has a structure that is thick as a whole and rich in stretchability, has a good touch feeling, and has a structure with heat-sealing properties. Furthermore, the non-woven fabric of the laminated paper of Embodiment 4 is made of a non-woven fabric manufactured using so-called core-sheath structure composite fibers as raw materials. This core-sheath composite fiber is a short-fiber synthetic fiber, such as a composite fiber of PE / PP or PE / PET, and is used as the raw material fiber of a web of a non-woven fabric (a fiber integrated layer sometimes called a fleece) manufactured by a dry method or the like. As a method of bonding the fibers together, the air-through method among thermal bonding methods is used (that is, by passing hot air from the front surface to the back surface in the thickness direction of the web, the resin in the sheath portion of the composite fiber is melted to bond between the fibers). Also, this core-sheath structure fiber is a fiber in which the outer sheath is PE (polyethylene) and the inner (central) core is PET (polyethylene terephthalate). Since this non-woven fabric does not use an adhesive for bonding between the fibers, it has a soft texture, but since it has no water absorption, when a printing portion is provided on the non-woven fabric 2 as in the laminated paper 10 of Embodiments 1 to 3, when the laminated paper 10 contains water, the non-woven fabric 2 does not supply moisture to the printing ink of the printing layer 2a on the surface due to water absorption. Therefore, this laminated paper 10 exhibits an additional specific effect of being able to maintain good print quality of the printed portion of the non-woven fabric 2. Also, in this non-woven fabric, the PE in the sheath portion softens at a low temperature, and the crepe paper 1 can be well adhered by the heat-sealing portion 11 of the laminated paper 10, while the PET in the core portion maintains the strength of the fiber itself and maintains the overall strength of the non-woven fabric. That is, in this non-woven fabric, the sheath portion of the core-sheath structure exhibits an adhesive force and functions as an adhesive for the crepe paper, while the core portion contributes to maintaining the strength.

[0056] In addition, as the material of the core-sheath structure fiber of this non-woven fabric, for polyethylene (PE), those with a melting point of around 120°C (i.e., low-density PE with a melting point of 95 - 130°C or 114 - 126°C, high-density PE with a melting point of 120 - 140°C or 126 - 137°C) can be used. Usually, low-density PE is used, but PE with a density such that the melting point is around 120°C can be used. On the other hand, for polypropylene (PP), those with a melting point of around 140°C (i.e., low-melting-point type PP) can be used. Note that there are three types of PP: random copolymerized PP, block copolymerized PP, and homopolymerized PP. Homopolymerized PP has a melting point of 160 - 165°C, and for block copolymerized PP, the synthetic melting point is 140 - 150°C (or 160 - 165°C). Therefore, in the case of block copolymerized PP, the one with the lower melting point side is used. Also, the random copolymerized PP with the lowest melting point can have a melting point of about 135 - 145°C or 135 - 150°C. In this embodiment, as the PP of the raw material fiber of the non-woven fabric, random copolymerized PP can be used. In this case, the melting point of the random copolymerized PP is a low melting point of 125°C.

[0057] [Type of non-woven fabric (type according to melting point)] In the laminated paper of the present invention, when a non-woven fabric is used as the intermediate layer sheet and any non-woven fabric is used, there are non-woven fabrics to which crepe paper does not adhere well due to the relationship of the melting point. Therefore, as the non-woven fabric 2 of the laminated paper 10, at a predetermined heating temperature during heat fusion by the heat fusion section row 11 in the manufacturing apparatus of the laminated paper, the crepe paper 1 is surely adhered to the non-woven fabric 2 by the heat fusion component of the non-woven fabric 2 (for example, PE of the sheath portion of the core-sheath structure fiber, etc.). A non-woven fabric having a melting point is used. In particular, including the laminated paper 10 of Embodiments 1 to 3, the laminated paper of the present invention has a structure in which a pair of crepe papers are adhered to the non-woven fabric only by the adhesive force of the linear heat fusion section row. Therefore, the type of non-woven fabric is selected so that sufficient bonding strength can be obtained between the crepe paper and the non-woven fabric with such a small bonding area. As such a non-woven fabric, a core-sheath type composite fiber as a polyester-based composite fiber, which is manufactured using a heat-fusible fiber for non-woven fabrics, can be used. For example, as the non-woven fabric in this case, a non-woven fabric manufactured from core-sheath type composite fibers with a fineness of 2.2 dtex, a cut length of 5 mm or 10 mm, and a sheath component softening point of about 110 ° C. can be used, or a fineness of 1.7 dtex, a cut length of 5 mm, and a sheath component softening point of about 110 ° C. A non-woven fabric manufactured from core-sheath type composite fibers can be used, or a non-woven fabric manufactured from core-sheath type composite fibers with a fineness of 2.2 dtex, a cut length of 5 mm, and a sheath component softening point of about 130 ° C. can be used. Alternatively, a non-woven fabric using two or more of the above core-sheath type composite fibers appropriately mixed as raw material fibers may be used.

[0058] Embodiment 5 (Manufacturing Apparatus for Laminated Paper) Including the invention of the laminated paper 10 of the above-described Embodiments 1 to 3, the laminated paper of the present invention is preferably manufactured using the manufacturing apparatus for laminated paper described below.

[0059] [Configuration of Manufacturing Apparatus] As shown in Fig. 9, the manufacturing apparatus for the laminated paper of Embodiment 5 rotatably supports, on three support rollers 51, 52, and 53 arranged side by side, a roll-shaped crepe paper 21 that is a raw material sheet (crepe paper raw material sheet) of one of the pair of crepe papers, a roll-shaped nonwoven fabric 22 that is a raw material sheet (nonwoven fabric raw material sheet) of the nonwoven fabric, and another roll-shaped crepe paper 23 that is a raw material sheet (crepe paper raw material sheet) of the other of the pair of crepe papers, respectively. Further, one crepe paper 1, the nonwoven fabric 2, and the other crepe paper 1 drawn from the one roll-shaped crepe paper 21, the roll-shaped nonwoven fabric 22, and the other roll-shaped crepe paper 23 respectively constitute a raw material sheet (laminated paper raw material sheet) of the laminated paper 10 in a laminated state (i.e., in a three-layer laminated state). This laminated paper raw material sheet is folded back by a first guide roller 61 and is guided and introduced between a first heat-sealing roller 70 as one pressure-bonding roller and a second heat-sealing roller 80 as the other pressure-bonding roller. Note that the laminated paper raw material sheet is folded back at the second heat-sealing roller 80 from the first guide roller 61 and is guided by a second guide roller 62 and inserted between the first heat-sealing roller 70 and the second heat-sealing roller 80. The laminated paper raw material sheet at the stage before being inserted between the first heat-sealing roller 70 and the second heat-sealing roller 80 is a pre-thermally-bonded laminated paper 10X in a state where the crepe paper 1 and the nonwoven fabric 2 are not thermally bonded.

[0060] Next, the crepe paper 1 and the nonwoven fabric 2 in a stacked state are heat-sealed between the first and second heat seal rollers 70, 80 to form the laminated paper 10 having the heat-sealed portion 11. The laminated paper raw material sheet after heat fusion becomes the heat-sealed laminated paper 10Y in a state in which the crepe paper 1 and the nonwoven fabric 2 are heat-sealed. The long heat-sealed laminated paper 10Y (as the base paper before cutting) led out from the first and second heat seal rollers 70, 80 is folded back by the third guide roller 63 and the fourth guide roller 64 and guided to the winding roller 55. The winding roller 55 winds up the heat-sealed laminated paper 10Y to form the rolled laminated paper 10R. This rolled laminated paper 10R is removed from the winding roller 55 and used as base paper for paper towels and the like. In addition, a slitter is disposed between the fourth guide roller 64 and the winding roller 55, and after heat sealing, the laminated paper 10R is cut into multiple pieces in the width direction, and multiple laminated papers 10 of a predetermined width are arranged side by side and wound around the winding roller.

[0061] [Heat seal roller] Next, the first and second heat seal rollers 70, 80 will be described in detail with reference to Figs. 10 to 13. Fig. 10 shows the first and second heat seal rollers 70, 80 of Fig. 9 as viewed from above, and the first and second heat seal rollers 70, 80 are arranged side by side facing each other at the front and rear of the supply direction of the pre-heat-sealing laminated paper 10X so that their axes are parallel to each other. The first and second heat seal rollers 70, 80 have the same predetermined roller length L (for example, an axis length of any value within the range of 1200 mm to 1500 mm) and the same predetermined roller diameter D (for example, a diameter of any value within the range of 180 mm to 300 mm).

[0062] [First heat seal roller] As shown in FIGS. 9 and 10, the first heat-sealing roller 70 is formed in a cylindrical shape with the predetermined roller diameter D, and on its circumferential surface, a non-pressure-bonding portion 71 having a ring-shaped concave groove with a constant width and a heat-pressure-bonding convex portion 72 having a broken-line convex ring shape (or broken-line convex strip shape) are arranged in parallel with each other at intervals in the axial direction. As shown in FIG. 11, each of the non-pressure-bonding portions 71 has a pressure-bonding surface 72a that extends intermittently as an arc-shaped surface in the circumferential direction along the circumferential surface of the first heat-sealing roller 70 and is a flat surface in the width direction. Specifically, each of the heat-pressure-bonding convex portions 72 has a heat-pressure-bonding surface 72a (as the circumferential surface of the heat-pressure-bonding convex portion 72) that linearly extends for a predetermined length in the circumferential direction along the circumferential surface of the first heat-sealing roller 70, and is continuously arranged at regular intervals in the circumferential direction of the first heat-sealing roller 70. The heat-pressure-bonding surface 72a of the heat-pressure-bonding convex portion 72 is an arc-shaped surface (curved surface) in the length direction, and the arc length is set to be the same as the length of the first heat-fusion portion 11a or the second heat-fusion portion 11b of the heat-fusion portion row 11. Also, the heat-pressure-bonding surface 72a of the heat-pressure-bonding convex portion 72 is a flat surface in the width direction, and the width is set to be the same as the width of the first heat-fusion portion 11a or the second heat-fusion portion 11b of the heat-fusion portion row 11. Furthermore, the interval of the gaps between the adjacent heat-pressure-bonding surfaces 72a of the heat-pressure-bonding convex portions 72 in each row is set to be the same dimension as the interval of the gaps between the adjacent first heat-fusion portions 11a or second heat-fusion portions 11b of the heat-fusion portion row 11.

[0063] Thus, the first heat-sealing roller 70 is configured to form heat-pressure bonding convex portions 72 in a broken-line convex ring shape over the entire circumference in the circumferential direction, thereby forming a row of heat-fusion bonding portions row 11 of the laminated paper 10. Further, the first heat-sealing roller 70 has a plurality of rows of heat-pressure bonding convex portions 72 arranged continuously and in parallel with each other at the same constant interval as the arrangement interval in the width direction of the plurality of rows of heat-fusion bonding portions row 11 of the laminated paper 10 over the entire axial direction thereof. As a result, the first heat-sealing roller 70 has non-pressure bonding portions 71 each in a ring concave groove shape between adjacent heat-pressure bonding convex portions 72. Also, the first heat-sealing roller 70 has a plurality of rows of non-pressure bonding portions 71 arranged continuously and in parallel with each other at the same constant interval as the non-fusion bonding portion 12 of the laminated paper 10 over the entire axial direction thereof. Further, in the first heat-sealing roller 70, the heat-pressure bonding surfaces 72a of the heat-pressure bonding convex portions 72 in adjacent rows are arranged such that the center position in the length direction of the heat-pressure bonding surface 72a of one heat-pressure bonding convex portion 72 comes to the middle position of the gap between the adjacent heat-pressure bonding surfaces 72a of the other heat-pressure bonding convex portion 72 by shifting the positions in the circumferential direction of the first heat-sealing roller 70 relative to each other. As a result, as shown in FIGS. 11, 12, and 13, the heat-pressure bonding convex portions 72 are composed of a first row of heat-pressure bonding convex portions 72A corresponding to the first row of heat-fusion bonding portions row 11A of the laminated paper 10 and a second row of heat-pressure bonding convex portions 72B corresponding to the second row of heat-fusion bonding portions row 11B. And the first row of heat-pressure bonding convex portions 72A arranges the heat-pressure bonding surface 72a in the circumferential direction of the first heat-sealing roller 70 corresponding to the first heat-fusion bonding portion 11a of the first row of heat-fusion bonding portions row 11A, and the second row of heat-pressure bonding convex portions 72B arranges the heat-pressure bonding surface 72a in the circumferential direction of the first heat-sealing roller 70 corresponding to the second heat-fusion bonding portion 11b of the second row of heat-fusion bonding portions row 11B.

[0064] Further, as shown in FIG. 10, the thermocompression bonding surface 72a of the heat fusion convex portion 72 is composed of a linear narrow band portion 72x that extends linearly in a plan view (curves along the circumferential surface in the circumferential direction of the second heat seal roller 70) and semicircular curved portions 72y at both ends in the length direction of the linear narrow band portion 72x. Thus, by the thermocompression bonding surface 72a of the heat fusion convex portion 72 of the heat seal roller 70, each of the heat fusion portions 11a and 11b of the heat fusion portion row 11 of the laminated paper 10 obtained by thermocompression bonding and heat fusing the crepe paper raw material sheet of the laminated paper raw material sheet to the nonwoven fabric raw material sheet corresponds to the outer shape of each thermocompression bonding surface 72a. As shown in FIGS. 1, 2, and 14, it is composed of a linear narrow band-shaped portion that extends linearly in the length direction of the laminated paper 10 and semicircular portions at both ends in the length direction of the linear narrow band-shaped portion. Further, as shown in FIG. 13, on both sides in the width direction of the thermocompression bonding surface 72a of each heat fusion convex portion 72, a pair of side surfaces 72b extend orthogonally to the thermocompression bonding surface 72a.

[0065] [Second heat seal roller] On the other hand, as shown in FIGS. 9 and 10, the second heat seal roller 80 is formed in a cylindrical shape with the predetermined roller diameter D, and on its circumferential surface, a non-bonding portion 81 forming a ring-shaped concave groove with a constant width and a heat fusion convex portion 82 forming a convex ring shape (or convex strip shape) with a constant width are arranged in parallel with each other at intervals in the axial direction. As shown in FIG. 11, each of the non-bonding portions 81 extends continuously as an arc-shaped surface in the circumferential direction along the circumferential surface of the second heat seal roller 80 (that is, over the entire circumference of the circumferential surface of the second heat seal roller 80), and has a pressure bonding surface 82a that is a flat surface in the width direction (as the circumferential surface of the heat fusion convex portion 82). The thermocompression bonding surface 82a of the heat fusion convex portion 82 is an arc-shaped surface (curved surface) in the length direction. Also, the thermocompression bonding surface 82a of the heat fusion convex portion 82 is a flat surface in the width direction, but its width is set to be larger than the width of the first heat fusion portion 11a or the second heat fusion portion 11b of the heat fusion portion 11 (that is, larger than the width of the thermocompression bonding surface 72a of the heat fusion convex portion 72 of the first heat seal roller 70).

[0066] As described above, the second heat-sealing roller 80 is formed with heat-sealing convex portions 82 each having a convex ring shape over the entire circumference in the circumferential direction at positions facing the heat-bonding convex portions 72 of the first heat-sealing roller 70. Thereby, the pre-thermo-fusion laminated paper 10X is sandwiched between the heat-bonding convex portions 72 of the first heat-sealing roller 70 and the heat-bonding convex portions 82 of the second heat-sealing roller 80, and the crepe paper 1 of the pre-thermo-fusion laminated paper 10X is heat-bonded and thermally fused to the non-woven fabric 2 between the heat-bonding surface 72a of the heat-bonding convex portion 72 and the heat-bonding surface 82a of the heat-bonding convex portion 82, so as to form the thermo-fusion portion row 11 of the laminated paper 10.

[0067] Furthermore, as shown in FIG. 13, the width of the thermocompression bonding surface 82a of the thermocompression bonding convex portion 82 of the second heat seal roller 80 is set to be a width that is larger by a certain dimension than the width of the thermocompression bonding surface 72a of the thermocompression bonding convex portion 72 of the first heat seal roller 70. When the thermocompression bonding surface 72a of the thermocompression bonding convex portion 72 and the thermocompression bonding surface 82a of the thermocompression bonding convex portion 82 are arranged facing each other (with a gap corresponding to the thickness of the heat fusion portion 11 of the laminated paper 10), in a substantially close contact state, on both sides in the width direction of the thermocompression bonding surface 72a of the thermocompression bonding convex portion 72, a certain width portions at both ends in the width direction of the thermocompression bonding surface 82a of the thermocompression bonding convex portion 82 are respectively exposed. Thereby, when thermocompression bonding and heat fusing the crepe paper 1 of the pre-heat fusion laminated paper 10X to the non-woven fabric 2 between the thermocompression bonding surface 72a of the thermocompression bonding convex portion 72 and the thermocompression bonding surface 82a of the thermocompression bonding convex portion 82, both end edges in the width direction of the thermocompression bonding surface 72a of the thermocompression bonding convex portion 72 will be arranged on the thermocompression bonding surface 82a of the thermocompression bonding convex portion 82, and the external force (especially, shear force) applied to the pre-heat fusion laminated paper 10X from both end edges in the width direction of the thermocompression bonding surface 72a of the thermocompression bonding convex portion 72 can be greatly reduced. That is, if the width of the thermocompression bonding surface 72a of the thermocompression bonding convex portion 72 and the width of the thermocompression bonding surface 82a of the thermocompression bonding convex portion 82 are set to the same width, when thermocompression bonding and heat fusing the crepe paper 1 of the pre-heat fusion laminated paper 10X to the non-woven fabric 2 between the thermocompression bonding surface 72a of the thermocompression bonding convex portion 72 and the thermocompression bonding surface 82a of the thermocompression bonding convex portion 82, both end edges in the width direction of the thermocompression bonding surface 72a of the thermocompression bonding convex portion 72 will be arranged at the same position as both end edges in the width direction of the thermocompression bonding surface 82a of the thermocompression bonding convex portion 82, and the external force (especially, shear force) applied to the pre-heat fusion laminated paper 10X from both end edges in the width direction of the thermocompression bonding surface 72a of the thermocompression bonding convex portion 72 will increase, so there is a possibility of cutting or damaging a part of the pre-heat fusion laminated paper 10X (especially, the crepe paper 1). However, as shown in FIG. 13, if the width of the thermocompression bonding surface 82a of the thermocompression bonding convex portion 82 of the second heat seal roller 80 is set to be a width that is larger by a certain dimension than the width of the thermocompression bonding surface 72a of the thermocompression bonding convex portion 72 of the first heat seal roller 70, such a problem can be surely prevented. Note that on both sides in the width direction of the thermocompression bonding surface 82a of the thermocompression bonding convex portion 82 of the second heat seal roller 80, a pair of side surfaces 82b extend while being inclined at a predetermined angle (an inclination angle that forms an obtuse angle) with respect to the thermocompression bonding surface 82a.Thus, in the laminated paper manufacturing apparatus, the heat-bonding surfaces 72a, 82a of the heat-bonding projections 72, 82 are wider than the heat-bonding surface 72a of the upper heat-sealing roller 70 and the heat-bonding surface 80 of the lower heat-sealing roller 80. Moreover, it is preferable to cut (notch) the corner portions at both ends in the width direction of the heat-bonding projections 92 of the lower heat-sealing roller 80 to form a cut shape such as a tapered shape (chamfered shape) or a rounded shape (curved chamfered shape).

[0068] [Roller length and roller diameter] The roller length L of the heat-sealing rollers 70, 80 is preferably in the range of 1200 mm to 1500 mm. If the roller diameter D of the heat-sealing rollers 70, 80 is less than 1200 mm, the productivity may decrease. On the other hand, if the roller length L of the heat-sealing rollers 70, 80 exceeds 1500 mm, there may be a problem of the crown phenomenon described later. Also, the roller diameter D of the heat-sealing rollers 70, 80 is preferably in the range of 180 mm to 300 mm. If the roller diameter D of the heat-sealing rollers 70, 80 is less than 180 mm, the pressure bonding force of the heat-fusion part of the pre-laminated paper 10X by the heat-bonding projections 72, 82 may be insufficient. On the other hand, if the roller diameter D of the heat-sealing rollers 70, 80 exceeds 300 mm, there will be a problem of high cost.

[0069] [Relationship between the roller diameter and roller length of the heat-sealing roller and the pressing force during heat bonding] In the hot pressing operation of the pre-laminated paper 10X before heat fusion by the heat-sealing rollers 70 and 80, the inventor has obtained the finding that the pressing force applied from the heat-pressing convex portions 72 and 82 to the heat-fusion portion of the pre-laminated paper 10X before heat fusion changes depending on the roller diameter D and the roller length L of the heat-sealing rollers 70 and 80. Further, the inventor has found that in the hot pressing operation of the pre-laminated paper 10X before heat fusion by the heat-sealing rollers 70 and 80, the pressing force applied from the heat-pressing convex portions 72 and 82 to the heat-fusion portion of the pre-laminated paper 10X before heat fusion (hereinafter referred to as "pressing force during hot pressing") needs to be at least 2 to 3 atmospheres or more even when the roller length L of the heat-sealing rollers 70 and 80 is small in order to surely form the heat-fusion portions 11 and 11b. Also, when the roller length L of the heat-sealing rollers 70 and 80 is 1400 mm, the pressing force during hot pressing is preferably in the range of 5.5 to 7.0 atmospheres. That is, when the roller length L of the heat-sealing rollers 70 and 80 is 1400 mm, since the pre-laminated paper 10X has sufficient durability up to a pressure of 5 to 7 atmospheres during hot pressing by the heat-sealing rollers 70 and 80, this range is optimal as the pressing force during hot pressing. If the pressing force during hot pressing is 7 atmospheres or more, there is a possibility that the pre-laminated paper 10X before heat fusion may be damaged (for example, break at a part corresponding to the corner portion of the heat-pressing surface 72a of the heat-pressing convex portion 72).

[0070] In addition, when the roller length L of the heat seal rollers 70 and 80 is 1400 mm, if the pressing force during thermocompression bonding is 7 atm or more, there is a possibility that a so-called crown phenomenon (a phenomenon in which the heat seal rollers 70 and 80 are curved in the radial direction and a gap is generated between the heat seal rollers 70 and 80) may occur in the heat seal rollers 70 and 80. When this crown phenomenon occurs, the heat seal rollers 70 and 80 are curved in the radial direction, and a drum-shaped gap is generated between the heat seal rollers 70 and 80 when viewed from the front. In this case, although the radial gap interval generated between the heat seal rollers 70 and 80 is a minute interval, in the length direction of the heat seal rollers 70 and 80, a large range is curved, and minute interval gaps are generated in that large range. Therefore, the gap between the heat seal rollers 70 and 80 due to this crown phenomenon is a minute gap of 1 mm or less. However, since the thickness of the laminated paper raw material sheet (the laminated paper 10X before heat fusion) is as thin as 1 mm or less, the thermocompression bonding surfaces 72a and 82a of the heat seal rollers 70 and 80 may float from the laminated paper 10X before heat fusion, and a gap may be generated between them. In this case, it becomes impossible to press the heat fusion part of the laminated paper 10X before heat fusion by the thermocompression bonding surfaces 72a and 82a of the heat seal rollers 70 and 80.

[0071] Therefore, in order to avoid the problem of such a crown phenomenon, when the roller length L of the heat-sealing rollers 70 and 80 is 1400 mm, as described above, the pressing force during thermocompression bonding is preferably within the range of 5.5 to 7.0 atmospheres. When the roller length L of the heat-sealing rollers 70 and 80 is 1400 mm, if the pressing force during thermocompression bonding is less than 5.5 atmospheres, there is a possibility that the laminated paper 10X before heat fusion cannot be stably formed into a heat-fused portion by the thermocompression bonding projections 72 and 82 (that is, the adhesive force of the heat-fused portion may be insufficient). On the other hand, when the roller length L of the heat-sealing rollers 70 and 80 is 1400 mm, if the pressing force during thermocompression bonding exceeds 7 atmospheres, excessive pressure is applied to the heat-fused portion of the laminated paper 10X before heat fusion, and the heat-fused portion may harden during adhesion. Also, when the roller length L of the heat-sealing rollers 70 and 80 is 1200 mm, the pressing force during thermocompression bonding can also be 4.5 atmospheres. Further, when the roller length L of the heat-sealing rollers 70 and 80 is 1500 mm, the pressing force during thermocompression bonding can also be within the range of 7.5 to 8.0 atmospheres. When the roller length L of the heat-sealing rollers 70 and 80 is 1500 mm, if the pressing force during thermocompression bonding is less than 7.5 atmospheres, there is a possibility that the laminated paper 10X before heat fusion cannot be stably formed into a heat-fused portion by the thermocompression bonding projections 72 and 82 (that is, the adhesive force of the heat-fused portion may be insufficient). On the other hand, when the roller length L of the heat-sealing rollers 70 and 80 is 1500 mm, if the pressing force during thermocompression bonding exceeds 8 atmospheres, excessive pressure is applied to the heat-fused portion of the laminated paper 10X before heat fusion, and the heat-fused portion may harden during adhesion.

[0072] [Temperature Control of Heat-Sealing Roller] In the laminated paper manufacturing apparatus, in order to surely thermally bond the crepe paper as the outer layer sheet and the intermediate layer sheet (such as a nonwoven fabric or a non-permeable sheet) at the thermally bonded portion of the laminated paper 10X before thermal bonding, the temperature during thermocompression bonding of the heat seal rollers 70 and 80 (hereinafter referred to as "thermocompression bonding temperature") is set within the range of 175 to 200°C, and it is preferable to control the temperature so that the temperature distribution is constant over the entire length direction of the heat seal rollers 70 and 80. When the thermocompression bonding temperature of the heat seal rollers 70 and 80 is 175°C or lower, the crepe paper and the nonwoven fabric cannot be surely adhered by thermal bonding at the thermally bonded portion of the laminated paper 10X before thermal bonding. On the other hand, when the thermocompression bonding temperature is 200°C or higher, the heat-curing resin (such as PP (polypropylene), PE (polyethylene), etc.) of the intermediate layer sheet may be cured and deteriorated, or the intermediate layer sheet itself such as the nonwoven fabric may be cured, and the heat-fusible fiber material (heat-fusible synthetic resin fiber) may not exhibit the fusion function (that is, this makes it impossible to bond by fusing the crepe paper). Also, as shown in Fig. 15(a), the thermocompression bonding temperature of the heat seal rollers 70 and 80 is preferably controlled in terms of temperature and rotation in the laminated paper manufacturing apparatus so that it increases or decreases in proportion to the rotation speed of the heat seal rollers 70 and 80 (that is, the supply speed of the laminated paper 10X before thermal bonding, in other words, the forming speed in the length direction of the thermally bonded portion).

[0073] [Rotation control of heat seal roller] In the laminated paper manufacturing apparatus, in order to surely heat-seal the crepe paper as the outer layer sheet and the intermediate layer sheet (such as a nonwoven fabric or a non-permeable sheet) at the heat-sealing part of the laminated paper 10X before heat-sealing, after the heat-pressing temperature of the heat-sealing rollers 70 and 80 reaches within the above-mentioned set range, the heat-sealing rollers 70 and 80 are started to rotate to execute the formation of the heat-sealing part of the laminated paper 10X before heat-sealing. Further, although the heat-pressing temperature of the heat-sealing rollers 70 and 80 is controlled to be constant within the above-mentioned set range, it is preferable to control the rotation speed of the heat-sealing rollers 70 and 80 to increase or decrease according to the thickness of the laminated paper raw material sheet (that is, the thickness of the laminated paper 10X before heat-sealing). That is, as shown in FIG. 15(c), it is preferable to perform rotation control of the heat-sealing rollers 70 and 80 in the laminated paper manufacturing apparatus so that the rotation speed of the heat-sealing rollers 70 and 80 increases or decreases in proportion to the thickness (base paper thickness) of the laminated paper 10X before heat-sealing. Also in this case, the heat-pressing temperature of the heat-sealing rollers 70 and 80 is maintained constant, and the rotation speed (feeding speed of the base paper) of the heat-sealing rollers 70 and 80 is increased or decreased according to the base paper thickness. Similarly, as shown in FIG. 15(d), it is also possible to perform rotation control of the heat-sealing rollers 70 and 80 in the laminated paper manufacturing apparatus so that the rotation speed of the heat-sealing rollers 70 and 80 increases or decreases in proportion to the thickness of the nonwoven fabric raw material sheet (nonwoven fabric thickness) of the laminated paper 10X before heat-sealing. Also in this case, the heat-pressing temperature of the heat-sealing rollers 70 and 80 is maintained constant, and the rotation speed (feeding speed of the base paper) of the heat-sealing rollers 70 and 80 is increased or decreased according to the nonwoven fabric thickness. Further, as shown in FIG. 15(b), it is also possible to perform temperature control of the heat-sealing rollers 70 and 80 in the laminated paper manufacturing apparatus so that the heat-pressing temperature of the heat-sealing rollers 70 and 80 increases or decreases in proportion to the thickness of the nonwoven fabric (nonwoven fabric thickness) of the laminated paper 10X before heat-sealing. Also in this case, the rotation speed of the heat-sealing rollers 70 and 80 is maintained constant, and the heat-pressing temperature of the heat-sealing rollers 70 and 80 is increased or decreased according to the nonwoven fabric thickness. Here, it is preferable that the heat-pressing speed (the length of the heat-sealing part row formed on the laminated paper 10X per unit time) by the heat-sealing roller is, for example, 20 m / min.

[0074] [Uniform Temperature Control] As described above, the laminated paper manufacturing apparatus controls the thermocompression bonding temperature of the heat seal rollers 70 and 80 so as to achieve a uniform temperature distribution over the entire heat seal rollers 70 and 80, thereby preventing uneven adhesion in the heat fusion part. As a configuration for this temperature control, the configuration shown in FIG. 12 can be adopted. Specifically, as shown in FIG. 11, the heat seal rollers 70 and 80 each have a cylindrical shape with both ends closed by a peripheral wall and a pair of side walls 73 and 83. As a result, as shown in FIG. 12, sealed spaces 70S and 80S are respectively formed inside the heat seal rollers 70 and 80. The internal spaces 70S and 80S of these heat seal rollers 70 and 80 are sealed spaces maintained in a vacuum state. And the laminated paper manufacturing apparatus connects external water supply means to the internal spaces 70S and 80S of the heat seal rollers 70 and 80 respectively, supplies moisture to the internal spaces 70S and 80S of the heat seal rollers 70 and 80 from this water supply means, and utilizes the water vapor obtained by heating the moisture when the heat seal rollers 70 and 80 are heated to maintain the temperature of the heat seal rollers 70 and 80 constant. For example, the laminated paper manufacturing apparatus stores a predetermined amount of water in the internal spaces 70S and 80S of the heat seal rollers 70 and 80 in advance, and utilizes the water vapor obtained by heating the moisture when the heat seal rollers 70 and 80 are heated to maintain the temperature of the heat seal rollers 70 and 80 constant, or supplies saturated water vapor or superheated water vapor to the internal spaces 70S and 80S during the operation of the heat seal rollers 70 and 80, and utilizes the water vapor to maintain the temperature of the heat seal rollers 70 and 80 constant. In this case, high-temperature water vapor (for example, saturated water vapor) is adhered to the inner surface of the heat seal rollers 70 and 80 so as to form a thin layer or film, and the entire heat seal rollers 70 and 80 are maintained at a uniform temperature by the layer-like or film-like water vapor. And the laminated paper manufacturing apparatus heats the heat seal rollers 70 and 80 by a predetermined heating means to raise the temperature to the thermocompression bonding temperature before the start of the thermocompression bonding operation by the heat seal rollers 70 and 80.For example, in the manufacturing apparatus for laminated paper, an induction coil is wound and disposed inside the heat-sealing rollers 70 and 80, and an alternating current is output to the induction coil to inductively generate eddy currents in the heat-sealing rollers 70 and 80, thereby heating the heat-sealing rollers to the predetermined thermocompression bonding temperature by Joule heating and controlling to maintain the predetermined temperature constant. Then, in addition to the induction heating by this induction heating means, by the temperature stabilization operation by the steam, the heat-sealing rollers 70 and 80 are respectively controlled so that the predetermined thermocompression bonding temperature is uniformly and equally maintained over the entire circumferential direction and the entire length direction (particularly, over the entire heat-pressing surfaces 72a and 82a of all the thermocompression bonding convex portions 72 and 82). Thereby, the temperature distribution of the heat-pressing surfaces 72a and 82a of the thermocompression bonding convex portions 72 and 83 of the heat-sealing rollers 70 and 80 is maintained absolutely identical (uniform) over the entire surface. Note that the heating means (heating heater) of the heat-sealing rollers 70 and 80 is preferably configured electrically as described above (for example, an induction heating type configuration such as the above induction heating means). By doing so, it is possible to avoid the risk of oil leakage as in the case of an oil heater type heating means, and also, compared to the oil heater type, the heating means itself can contribute to stabilizing the temperature distribution of the heat-sealing rollers 70 and 80.

[0075] Further, the manufacturing apparatus for laminated paper controls the pressing force during thermocompression bonding of the heat-sealing rollers 70 and 80 to be constant particularly over the entire opposing surface between the heat-pressing surface 72a of the thermocompression bonding convex portion 72 and the heat-pressing surface 82a of the thermocompression bonding convex portion 82. In this way, it is preferable that the manufacturing apparatus for laminated paper simultaneously controls the temperature distribution and the pressure distribution of the heat-sealing rollers 70 and 80. By doing so, it is possible to minimize the uneven adhesion in each heat fusion portion 11a and 11b of the heat fusion portion row 11 of the laminated paper 10.

[0076] [Manufacturing Method of Laminated Paper] Including the invention of the laminated paper 10 of the above Embodiments 1 to 3, the laminated paper of the present invention is preferably manufactured by the manufacturing method of the laminated paper described below. Note that the manufacturing apparatus for laminated paper of Embodiment 5 can be preferably used for this manufacturing method of laminated paper.

[0077] Embodiment 6 (Another Example of Laminated Paper Manufacturing Apparatus) In the laminated paper manufacturing apparatus of Embodiment 5, as a means for forming the heat fusion part row 11 of the laminated paper 10 (hereinafter referred to as "heat fusion means"), a configuration of thermocompression bonding by a pair of heat seal rollers 70 and 80 is adopted. However, as the heat fusion means for forming the heat fusion part row 11 of the laminated paper 10, in addition to this configuration, a configuration can also be adopted in which crepe paper is adhered to an intermediate layer sheet such as a non-woven fabric by high-frequency welding or ultrasonic welding (by the fusion operation of the heat fusion component of the intermediate layer sheet). According to these heat fusion means using high-frequency welding or ultrasonic welding, it is easy to adjust the adhesion temperature by heat fusion, there is a variety of materials, and there is also a possibility of using an inexpensive material in the form of a sheet of a thermoplastic resin film with a low melting point. For example, the laminated paper manufacturing apparatus shown in FIG. 16 is provided with a high-frequency sewing machine as the high-frequency welding means in the heat fusion means. The laminated paper manufacturing apparatus of this Embodiment 6 has basically the same configuration as the laminated paper manufacturing apparatus of Embodiment 5 shown in FIG. 9, except that the pair of heat seal rollers 70 and 80 of the laminated paper manufacturing apparatus of Embodiment 5 are replaced with a high-frequency sewing machine 100. The pre-laminated paper 10X with a three-layer structure (a structure of three sheets combined) in which a non-woven fabric 2 is interposed between a pair of crepe papers 1 is guided and fed to the high-frequency sewing machine 100 by guide rollers 61 and 62. After the heat fusion part row 11 is formed at a predetermined position of the laminated paper 10 during heat fusion by the high-frequency sewing machine 100, the laminated paper 10Y after heat fusion is guided by guide rollers 63 and 64 and wound around a winding roller 55.

[0078] [High-frequency sewing machine] The high-frequency sewing machine 100 is configured such that a first welding roller 101 and a second welding roller 102 are arranged opposite to each other, and a pre-thermal fusion laminated paper 10X is sandwiched between the first welding roller 101 and the second welding roller 102 and subjected to high-frequency welding to form the heat fusion part row 11. At this time, the high-frequency current applied to the first welding roller 101 and the second welding roller 102 (for heat welding) is preferably subjected to various controls so as to achieve constant temperature control according to various conditions such as the base paper thickness and non-woven fabric thickness, as described in the laminated paper manufacturing apparatus and the laminated paper manufacturing method of the fifth embodiment.

[0079] [Another aspect of the present invention] Note that the present invention can also be grasped as an invention of a laminated paper, a method for manufacturing a laminated paper, or a manufacturing apparatus for a laminated paper described below.

[0080] First, the laminated paper according to the first aspect of the present invention is composed of crepe paper as a pair of outer layer sheets and a heat-fusible intermediate layer sheet disposed in a laminated state between the crepe papers, and the crepe paper is heat-fused to the intermediate layer sheet by a linear heat fusion part row extending in a direction orthogonal to the direction in which the crepe wrinkles of the crepe paper extend to form a laminated structure. Further, in the laminated paper of the present invention, a printing part is provided on the inner surface of the intermediate layer sheet or the crepe paper, and the thickness of the crepe paper is set to a thickness such that the printing part can be visually recognized from the outside through the crepe paper when the crepe paper is in a wet state.

[0081] The method for manufacturing a laminated paper according to the second aspect of the present invention is the method for manufacturing a laminated paper according to claim 1, wherein the intermediate layer sheet is made of a non-woven fabric, and in order to compensate for the shrinkage during printing of the printing part on the non-woven fabric raw sheet that becomes the raw sheet of the non-woven fabric, a non-woven fabric raw sheet having a width larger by a predetermined ratio than the width of the laminated paper to be actually obtained is used according to the shrinkage rate.

[0082] The manufacturing apparatus for laminated paper according to the third aspect of the present invention is the manufacturing apparatus for laminated paper according to the first aspect, and includes a pair of first and second heat-sealing rollers for forming the heat-fusing part row. The first heat-sealing roller has convex heat-pressing convex parts in a strip shape corresponding to the heat-fusing part, and the peripheral surface of the heat-pressing convex part is used as a heat-pressing surface. The second heat-sealing roller has convex heat-pressing convex parts in a strip shape facing the heat-pressing convex parts of the first heat-sealing roller, and the peripheral surface of the heat-pressing convex part is used as a heat-pressing surface facing the heat-pressing surface of the first heat-sealing roller. The width of the heat-pressing surface of the heat-pressing convex part of the second heat-sealing roller is set to be larger by a certain dimension than the width of the heat-pressing surface of the heat-pressing convex part of the first heat-sealing roller.

[0083] Further, the laminated paper of the present invention from another aspect comprises crepe paper as a pair of outer layer sheets and a heat-fusible intermediate layer sheet disposed in a laminated state between the crepe papers. The crepe papers are heat-fused to the intermediate layer sheet by a linear heat-fusion part row extending in a direction orthogonal to the extending direction of the crepe wrinkles of the crepe paper to form a laminated structure. A printing part is provided on the surface of the intermediate layer sheet facing one of the crepe papers serving as the outer layer sheet. The thickness of the crepe paper is set to such a thickness that the printing part provided on the surface of the intermediate layer sheet can be visually recognized from the outside through the crepe paper when the crepe paper is in a wet state. Even when the crepe paper is in a dry state, the printing part provided on the intermediate layer sheet can be visually recognized from the outside through the crepe paper, and when the crepe paper contains water, the degree of transmission of the printing part provided on the intermediate layer sheet through the crepe paper increases, so that the visibility of the printing part provided on the intermediate layer sheet from the outside through the crepe paper increases. At least the thickness of the crepe paper on the side where the printing part is provided in the intermediate layer sheet is set. Incidentally, the laminated paper of the present invention comprises crepe paper as a pair of outer layer sheets and a heat-fusible intermediate layer sheet disposed in a laminated state between the crepe papers. The crepe papers are heat-fused to the intermediate layer sheet by a linear heat-fusion part row extending in a direction orthogonal to the extending direction of the crepe wrinkles of the crepe paper to form a laminated structure, and a printing part is provided on the intermediate layer sheet or the inner surface of the crepe paper. The thickness of the crepe paper can be configured to be set to such a thickness that the printing part can be visually recognized from the outside through the crepe paper when the crepe paper is in a wet state.

[0084] Moreover, the method for manufacturing a laminated paper according to another aspect of the present invention is the method for manufacturing a laminated paper according to the above - mentioned another aspect, wherein the intermediate layer sheet is made of a non - woven fabric. As the non - woven fabric, a non - water - absorbent air - through non - woven fabric manufactured by bonding fibers of a core - sheath structure composite fiber, in which the outer sheath is polyethylene and the inner core is polyethylene terephthalate, by the air - through method without using an adhesive, is used. The printing part is formed using a flexographic printing technique as the printing method and using aqueous ink or ultraviolet - curable ink as the printing ink. In order to compensate for the shrinkage during printing of the printing part on the non - woven fabric raw sheet that becomes the raw sheet of the non - woven fabric, a non - woven fabric raw sheet having a width larger by a predetermined ratio than the width of the laminated paper to be actually obtained is used according to the shrinkage rate to perform printing of the printing part on the non - woven fabric. Note that the method for manufacturing a laminated paper of the present invention may be configured such that the intermediate layer sheet is made of a non - woven fabric, and in order to compensate for the shrinkage during printing of the printing part on the non - woven fabric raw sheet that becomes the raw sheet of the non - woven fabric, a non - woven fabric raw sheet having a width larger by a predetermined ratio than the width of the laminated paper to be actually obtained is used according to the shrinkage rate.

[0085] The manufacturing apparatus for a laminated paper according to another aspect of the present invention is the manufacturing apparatus for a laminated paper according to the above - mentioned another aspect, and includes a pair of first and second heat - seal rollers for forming the heat - fusion part row. The first heat - seal roller has convex - strip - shaped heat - pressure - bonding convex parts corresponding to the heat - fusion part, and the peripheral surface of the heat - pressure - bonding convex parts is used as the heat - pressure - bonding surface. The second heat - seal roller has convex - strip - shaped heat - pressure - bonding convex parts facing the heat - pressure - bonding convex parts of the first heat - seal roller, and the peripheral surface of the heat - pressure - bonding convex parts is used as a heat - pressure - bonding surface facing the heat - pressure - bonding surface of the first heat - seal roller. The width of the heat - pressure - bonding surface of the heat - pressure - bonding convex parts of the second heat - seal roller is set to be larger by a certain dimension than the width of the heat - pressure - bonding surface of the heat - pressure - bonding convex parts of the first heat - seal roller.

[0086] Alternatively, the present invention can also be understood as the invention of the laminated paper, the method for manufacturing a laminated paper, or the manufacturing apparatus for a laminated paper described below.

[0087] First, the present invention comprises crepe paper as a pair of outer sheets and a heat-fusible intermediate sheet disposed in a laminated state between the crepe papers. The crepe papers are heat-fused to the intermediate sheet by a linear heat-fusion part row extending in a direction orthogonal to the direction in which the crepe wrinkles of the crepe paper extend, to form a laminated structure. A printing part is provided on the inner surface of the intermediate sheet or the crepe paper. The thickness of the crepe paper is set to a thickness such that the printing part can be visually recognized from the outside through the crepe paper when the crepe paper is in a wet state. It can also be grasped as a laminated paper characterized by this.

[0088] Furthermore, in the above invention, the intermediate sheet is made of a non-woven fabric that is a material capable of printing the printing part and is a material capable of heat-fusing and adhering the crepe paper as the outer sheet with the heat-fusion part row. The printing part is provided on the surface of the non-woven fabric facing one of the crepe papers as the outer sheet. It can also be grasped as a laminated paper characterized by this.

[0089] Furthermore, in the above invention, the printing part is provided on the inner surface of one of the crepe papers as the outer sheet. It can also be grasped as a laminated paper characterized by this.

[0090] Furthermore, in the above invention, the intermediate sheet is made of a non-permeable sheet made of a synthetic resin that blocks the permeation of moisture and / or oil. The printing part is provided on the non-permeable sheet as the intermediate sheet. It can also be grasped as a laminated paper characterized by this.

[0091] Furthermore, in the above invention, the non-woven fabric has a basis weight in the range of 15 to 25 g / m 2 and has a thickness within this range. It can also be grasped as a laminated paper characterized by this.

[0092] Furthermore, in the above invention, the crepe paper has a thickness in the range of 20 to 50 g / m 2 and has a thickness within this range. It can also be grasped as a laminated paper characterized by this.

[0093] In addition, in the above invention, the interval in the width direction between the center lines in the width direction of the adjacent heat-sealing part rows, that is, the interval between the heat-sealing parts in the width direction, is set to an arbitrary value within a predetermined range according to the range of the crepe ratio of the crepe paper. When the crepe ratio of the crepe paper is within the range of 20% to 26%, the interval between the heat-sealing parts in the width direction is set within the range of 10 mm to 15 mm. When the crepe ratio of the crepe paper is within the range of 26% to 30%, the interval between the heat-sealing parts in the width direction is set within the range of 15 to 25 mm. It can also be understood as a laminated paper characterized by this.

[0094] In addition, the present invention is a method for manufacturing the laminated paper of the above invention. The intermediate layer sheet is made of a non-woven fabric. In order to compensate for the shrinkage during printing of the printing part on the non-woven fabric raw sheet that becomes the raw sheet of the non-woven fabric, a non-woven fabric raw sheet having a width that is a predetermined ratio larger than the width of the laminated paper to be actually obtained is used according to the shrinkage rate. It can also be understood as a method for manufacturing a laminated paper characterized by this.

[0095] In addition, the present invention is a manufacturing apparatus for the laminated paper of the above invention. It includes a pair of first and second heat-sealing rollers for forming the heat-sealing part rows. The first heat-sealing roller has convex heat-pressing protrusions corresponding to the heat-sealing parts, and the peripheral surface of the heat-pressing protrusions is used as the heat-pressing surface. The second heat-sealing roller has convex heat-pressing protrusions facing the heat-pressing protrusions of the first heat-sealing roller, and the peripheral surface of the heat-pressing protrusions is used as the heat-pressing surface facing the heat-pressing surface of the first heat-sealing roller. The width of the heat-pressing surface of the heat-pressing protrusions of the second heat-sealing roller is set to a width that is a certain dimension larger than the width of the heat-pressing surface of the heat-pressing protrusions of the first heat-sealing roller. It can also be understood as a manufacturing apparatus for laminated paper characterized by this.

[0096] Incidentally, the present invention according to another aspect will be described. The laminated paper according to the first aspect of the present invention comprises crepe paper as a pair of outer layer sheets and a non-woven fabric as a heat-fusible intermediate layer sheet disposed in a laminated state between the pair of crepe papers. The crepe paper is heat-fused to the intermediate layer sheet by a linear heat-fusion part row extending in a direction orthogonal to the extending direction of the crepe wrinkles of the crepe paper to form a laminated structure. The crepe rate of the crepe paper is set within the range of 20% to 30%, and the heat-fusion part interval in the width direction of the heat-fusion part row is set within the range of 10 mm to 25 mm. Within the range of the heat-fusion part interval in the width direction, the heat-fusion part interval in the width direction is increased in proportion to the increase in the crepe rate of the crepe paper.

[0097] Further, the present invention according to another aspect will be described. The laminated paper according to the second aspect of the present invention comprises crepe paper as a pair of outer layer sheets and a non-woven fabric as a heat-fusible intermediate layer sheet disposed in a laminated state between the pair of crepe papers. The crepe paper is heat-fused to the intermediate layer sheet by a linear heat-fusion part row extending in a direction orthogonal to the extending direction of the crepe wrinkles of the crepe paper to form a laminated structure. When the crepe rate of the crepe paper is within the range of 20% to 26%, the heat-fusion part interval in the width direction of the heat-fusion part row is set within the range of 10 mm to 15 mm. When the crepe rate of the crepe paper is within the range of 26% to 30%, the heat-fusion part interval in the width direction of the heat-fusion part row is set within the range of 15 to 25 mm. Within the range of the heat-fusion part interval in the width direction, the heat-fusion part interval in the width direction is increased in proportion to the increase in the crepe rate of the crepe paper.

Industrial Applicability

[0098] The laminated paper of the present invention, the method for manufacturing the laminated paper, and the manufacturing apparatus for the laminated paper can be suitably applied to the use of paper towel products. In the case of paper towel products, it can be applied to paper towel products such as two-fold, three-fold, four-fold, and Avalokitesvara fold. In addition to this, the roll-shaped base paper can be directly commercialized and used for the use of the base paper of an automatic paper towel manufacturing machine. Also, in addition to paper towel products, it can be applied to sanitary products used for purposes such as care and nursing.

Explanation of Symbols

[0099] 1: Crepe paper, 2: Non-woven fabric (heat-fusible sheet) 10, 40, 50, 60, 70, 80: Laminated paper 11, 12, 41, 42, 51, 61, 82: Heat-fusion part 11a, 12a, 41a, 42a, 51a, 61a, 82a: Long dot 11b, 12b, 41b, 42b, 51b, 61b, 82b: Non-fusion part 30: Second heat-sealing roller (heat-sealing roller) 31: First heat-sealing part (heat-sealing part) 32: Second heat-sealing part (heat-sealing part) 31a, 32a: Pressing protrusion, 31b, 32b: Non-pressing part

Claims

1. A laminated paper, The crepe paper that matches the and a nonwoven fabric as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers, The crepe paper is heat-sealed to the intermediate layer sheet by a linear heat-sealing portion row extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend to form a laminated structure; The laminated paper is The crepe rate of the crepe paper is set within a predetermined crepe rate range, and the interval between the heat-sealed portions in the width direction of the row of heat-sealed portions is set within a predetermined interval between the heat-sealed portions; The laminated paper is The crepe rate of the crepe paper is set to one of the predetermined crepe rates within a range of 20% to 40% as the predetermined crepe rate range, and the widthwise spacing of the heat-sealed portions of the row of heat-sealed portions is set to one of the predetermined spacings of the heat-sealed portions within a range of 10 mm to 25 mm as the predetermined spacing range of the heat-sealed portions; the laminated paper has a non-fused portion between the adjacent rows of heat-sealed portions, The non-fused portion of the laminated paper expands after the laminated paper absorbs water to form an expanded portion, and the expanded portion is configured to form a wide expanded portion and a narrow expanded portion, The expanded portion of the laminated paper has expanded wrinkles which are different from the crepe wrinkles of the crepe paper and are larger in size than the crepe wrinkles, and the expanded wrinkles include large expanded wrinkles which extend over almost the entire width of the wide expanded portion and medium expanded wrinkles which extend over almost the entire width of the narrow expanded portion, The expanded large wrinkles of the laminated paper are composed of first expanded large wrinkles in which some of the crepe wrinkles do not disappear and remain mixed with the expanded large wrinkles, and second expanded large wrinkles in which the crepe wrinkles have completely disappeared, The expansion wrinkles of the laminated paper are composed of first expansion wrinkles in which some of the crepe wrinkles do not disappear but remain and are mixed with the expansion wrinkles, and second expansion wrinkles in which the crepe wrinkles have completely disappeared, This laminated paper is characterized in that the first large expansion wrinkles, the second large expansion wrinkles, the first medium expansion wrinkles, and the second medium expansion wrinkles of the laminated paper remain not only when the laminated paper is moistened, but also after the laminated paper is dried after being moistened.

2. The row of heat-sealed portions is configured by arranging first heat-sealed portions in the form of straight line segments of a constant length and a constant width in a broken line shape at constant intervals in the length direction, and arranging second heat-sealed portions in the form of straight line segments of the same constant length and width as the first heat-sealed portions at positions shifted from the first heat-sealed portions such that the midpoints of the second heat-sealed portions coincide with the midpoints of the intervals between the first heat-sealed portions, the wide expansion portion is provided on the laminated paper in a non-overlapping range, which is a range where the adjacent first heat-sealed portion and the adjacent second heat-sealed portion do not overlap, as a substantially rectangular portion having the length of the non-overlapping range and the width of the non-overlapping range, and the narrow expansion portion is provided on the laminated paper in an overlapping range, which is a range where the adjacent first heat-sealed portion and the adjacent second heat-sealed portion overlap, as a small substantially rectangular portion having the length of the overlapping range and the width of the overlapping range, The length of each of the heat-sealed portions is set to a predetermined length within a range of 35 mm to 45 mm; The width of each of the heat-sealed portions is set to a predetermined width within a range of 1.5 mm to 2.5 mm; 2. The laminated paper according to claim 1, wherein the aspect ratio, which is the ratio of the length to the width of each of the heat-sealed portions, is set to a predetermined aspect ratio within a range of 13:1 to 23:

1.

3. In each of the rows of heat-sealed portions, a longitudinal heat-sealed portion interval between adjacent heat-sealed portions in the longitudinal direction is set to a predetermined value within a range of 18 mm to 22 mm; 3. The laminated paper according to claim 2, wherein the ratio of the length of each heat-sealed portion to the distance between the heat-sealed portions is set to 2:

1.

4. The row of heat-sealed portions is configured by arranging first heat-sealed portions in the form of straight line segments of a constant length and a constant width in a broken line shape at constant intervals in the length direction, and arranging second heat-sealed portions in the form of straight line segments of the same constant length and width as the first heat-sealed portions at positions shifted from the first heat-sealed portions such that the midpoints of the second heat-sealed portions coincide with the midpoints of the intervals between the first heat-sealed portions, 3. The laminated paper according to claim 2, wherein each of said heat-sealed portions in said heat-sealed portion row has both longitudinal ends curved into a flat semicircular shape.

5. The basis weight of the crepe paper is 20 to 50 g / m ２ is set within the range The nonwoven fabric has a basis weight of 15 to 25 g / m ２ 5. The laminated paper according to claim 1, wherein the thickness is set within the range of 1.0 mm / s.

6. The nonwoven fabric has a density of 20 g / m ２ and Each of the crepe papers has a thickness of 35 g / m ２ and The overall basis weight is 90 g / m ２ 6. The laminated paper according to claim 5, characterized in that

7. The nonwoven fabric has a density of 20 g / m ２ and Each of the crepe papers is 20 to 35 m ２ 5. The laminated paper of claim 1, wherein the laminated paper has a basis weight in the range of 1:1 to 1:

1.

8. A product made by folding laminated paper, The laminated paper is The crepe paper that matches the and a nonwoven fabric as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers, The crepe paper is heat-sealed to the intermediate layer sheet by a linear heat-sealing portion row extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend to form a laminated structure; The laminated paper is The crepe rate of the crepe paper is set within a predetermined crepe rate range, and the interval between the heat-sealed portions in the width direction of the row of heat-sealed portions is set within a predetermined interval between the heat-sealed portions; The laminated paper is The crepe rate of the crepe paper is set to one of the predetermined crepe rates within a range of 20% to 40% as the predetermined crepe rate range, and the widthwise spacing of the heat-sealed portions of the row of heat-sealed portions is set to one of the predetermined spacings of the heat-sealed portions within a range of 10 mm to 25 mm as the predetermined spacing range of the heat-sealed portions; the laminated paper has a non-fused portion between the adjacent rows of heat-sealed portions, The non-fused portion of the laminated paper expands after the laminated paper absorbs water to form an expanded portion, and the expanded portion is configured to form a wide expanded portion and a narrow expanded portion, The expanded portion of the laminated paper has expanded wrinkles which are different from the crepe wrinkles of the crepe paper and are larger in size than the crepe wrinkles, and the expanded wrinkles include large expanded wrinkles which extend over almost the entire width of the wide expanded portion and medium expanded wrinkles which extend over almost the entire width of the narrow expanded portion, The expanded large wrinkles of the laminated paper are composed of first expanded large wrinkles in which some of the crepe wrinkles do not disappear and remain mixed with the expanded large wrinkles, and second expanded large wrinkles in which the crepe wrinkles have completely disappeared, The expansion wrinkles of the laminated paper are composed of first expansion wrinkles in which some of the crepe wrinkles do not disappear but remain and are mixed with the expansion wrinkles, and second expansion wrinkles in which the crepe wrinkles have completely disappeared, The product is made by processing the laminated paper, characterized in that the first large expansion wrinkles, the second large expansion wrinkles, the first medium expansion wrinkles, and the second medium expansion wrinkles of the laminated paper remain not only when the laminated paper is moistened, but also after the laminated paper is dried after being moistened.

9. The row of heat-sealed portions is configured by arranging first heat-sealed portions in the form of straight line segments of a constant length and a constant width in a broken line shape at constant intervals in the length direction, and arranging second heat-sealed portions in the form of straight line segments of the same constant length and width as the first heat-sealed portions at positions shifted from the first heat-sealed portions such that the midpoints of the second heat-sealed portions coincide with the midpoints of the intervals between the first heat-sealed portions, the wide expansion portion is provided on the laminated paper in a non-overlapping range, which is a range where the adjacent first heat-sealed portion and the adjacent second heat-sealed portion do not overlap, as a substantially rectangular portion having the length of the non-overlapping range and the width of the non-overlapping range, and the narrow expansion portion is provided on the laminated paper in an overlapping range, which is a range where the adjacent first heat-sealed portion and the adjacent second heat-sealed portion overlap, as a small substantially rectangular portion having the length of the overlapping range and the width of the overlapping range, The length of each of the heat-sealed portions is set to a predetermined length within a range of 35 mm to 45 mm; The width of each of the heat-sealed portions is set to a predetermined width within a range of 1.5 mm to 2.5 mm; A product made by processing the laminated paper described in claim 8, characterized in that the aspect ratio, which is the ratio of length to width of each heat-sealed portion, is set to a predetermined aspect ratio within the range of 13:1 to 23:

1.

10. In each of the rows of heat-sealed portions, a longitudinal heat-sealed portion interval between adjacent heat-sealed portions in the longitudinal direction is set within a range of 18 mm to 22 mm; 10. A product produced by processing a laminated paper according to claim 9, wherein the ratio of the length of each heat-sealed portion to the distance between the heat-sealed portions is set to 2:

1.

11. The row of heat-sealed portions is configured by arranging first heat-sealed portions in the form of straight line segments of a constant length and a constant width in a broken line shape at constant intervals in the length direction, and arranging second heat-sealed portions in the form of straight line segments of the same constant length and width as the first heat-sealed portions at positions shifted from the first heat-sealed portions such that the midpoints of the second heat-sealed portions coincide with the midpoints of the intervals between the first heat-sealed portions, 10. A product produced by processing laminated paper according to claim 9, wherein each heat-sealed portion in the heat-sealed portion row has both longitudinal ends curved into a flat semicircular shape.

12. The basis weight of the crepe paper is 20 to 50 g / m ２ is set within the range The nonwoven fabric has a basis weight of 15 to 25 g / m ２ A product obtained by processing the laminated paper according to any one of claims 8 to 11, characterized in that the range of

13. The nonwoven fabric has a density of 20 g / m ２ and Each of the crepe papers has a thickness of 35 g / m ２ and The overall basis weight is 90 g / m ２ 13. A product obtained by processing the laminated paper according to claim 12.

14. The nonwoven fabric has a density of 20 g / m ２ and Each of the crepe papers is 20 to 35 m ２ 12. A product obtained by processing the laminated paper according to any one of claims 8 to 11, characterized in that it has a basis weight within the range of

15. A laminated paper, The crepe paper that matches the and a nonwoven fabric as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers, The crepe paper is heat-sealed to the intermediate layer sheet by a linear heat-sealing portion row extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend to form a laminated structure; The laminated paper is The crepe rate of the crepe paper is set within a predetermined crepe rate range, and the interval between the heat-sealed portions in the width direction of the row of heat-sealed portions is set within a predetermined interval between the heat-sealed portions; The laminated paper is The crepe rate of the crepe paper is set to one of the predetermined crepe rates within a range of 20% to 40% as the predetermined crepe rate range, and the widthwise spacing of the heat-sealed portions of the row of heat-sealed portions is set to one of the predetermined spacings of the heat-sealed portions within a range of 10 mm to 25 mm as the predetermined spacing range of the heat-sealed portions; the laminated paper has a non-fused portion between the adjacent rows of heat-sealed portions, The non-fused portion of the laminated paper expands after the laminated paper absorbs water to form an expanded portion, and the expanded portion is configured to form a wide expanded portion and a narrow expanded portion, The expanded portion of the laminated paper has expanded wrinkles which are different from the crepe wrinkles of the crepe paper and are larger in size than the crepe wrinkles, and the expanded wrinkles include large expanded wrinkles which extend over almost the entire width of the wide expanded portion and medium expanded wrinkles which extend over almost the entire width of the narrow expanded portion, The expanded large wrinkles of the laminated paper are composed of first expanded large wrinkles in which some of the crepe wrinkles do not disappear and remain mixed with the expanded large wrinkles, and second expanded large wrinkles in which the crepe wrinkles have completely disappeared, The expansion wrinkles of the laminated paper are composed of first expansion wrinkles in which some of the crepe wrinkles do not disappear but remain and are mixed with the expansion wrinkles, and second expansion wrinkles in which the crepe wrinkles have completely disappeared, The first large expansion wrinkles, the second large expansion wrinkles, the first medium expansion wrinkles, and the second medium expansion wrinkles of the laminated paper remain not only when the laminated paper is moistened, but also after the laminated paper is moistened and then dried, The laminated paper further comprises a printing portion.

16. The printing unit is provided on either the crepe paper or the nonwoven fabric, 16. The laminated paper according to claim 15, wherein the printed portion is a pattern portion consisting of a single color pattern or a multi-color pattern, or an advertising portion consisting of advertising content.

17. The printed portion is provided on a surface of the laminated paper other than the outer surface of the crepe paper, A laminated paper as described in claim 15, characterized in that the crepe paper on the side of the laminated paper on which the printed portion is provided is set to a thickness that increases the visibility of the printed portion from the outside when the crepe paper is moistened.

18. 16. The laminated paper according to claim 15, wherein the printed portion is formed on the nonwoven fabric by flexographic printing.

19. A product made by folding laminated paper, The laminated paper is The crepe paper that matches the and a nonwoven fabric as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers, The crepe paper is heat-sealed to the intermediate layer sheet by a linear heat-sealing portion row extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend to form a laminated structure; The laminated paper is The crepe rate of the crepe paper is set within a predetermined crepe rate range, and the interval between the heat-sealed portions in the width direction of the row of heat-sealed portions is set within a predetermined interval between the heat-sealed portions; The laminated paper is The crepe rate of the crepe paper is set to one of the predetermined crepe rates within a range of 20% to 40% as the predetermined crepe rate range, and the widthwise spacing of the heat-sealed portions of the row of heat-sealed portions is set to one of the predetermined spacings of the heat-sealed portions within a range of 10 mm to 25 mm as the predetermined spacing range of the heat-sealed portions; the laminated paper has a non-fused portion between the adjacent rows of heat-sealed portions, The non-fused portion of the laminated paper expands after the laminated paper absorbs water to form an expanded portion, and the expanded portion is configured to form a wide expanded portion and a narrow expanded portion, The expanded portion of the laminated paper has expanded wrinkles which are different from the crepe wrinkles of the crepe paper and are larger in size than the crepe wrinkles, and the expanded wrinkles include large expanded wrinkles which extend over almost the entire width of the wide expanded portion and medium expanded wrinkles which extend over almost the entire width of the narrow expanded portion, The expanded large wrinkles of the laminated paper are composed of first expanded large wrinkles in which some of the crepe wrinkles do not disappear and remain mixed with the expanded large wrinkles, and second expanded large wrinkles in which the crepe wrinkles have completely disappeared, The expansion wrinkles of the laminated paper are composed of first expansion wrinkles in which some of the crepe wrinkles do not disappear but remain and are mixed with the expansion wrinkles, and second expansion wrinkles in which the crepe wrinkles have completely disappeared, The first large expansion wrinkles, the second large expansion wrinkles, the first medium expansion wrinkles, and the second medium expansion wrinkles of the laminated paper remain not only when the laminated paper is moistened, but also after the laminated paper is moistened and then dried, Further, a product obtained by processing the laminated paper, characterized in that it has a printed portion.

20. The printed portion is provided on either the crepe paper or the nonwoven fabric in the laminated paper, 20. The product produced by processing the laminated paper according to claim 19, wherein the printed portion is a pattern portion consisting of a single color pattern or a multi-color pattern, or an advertising portion consisting of advertising content.

21. The printed portion is provided on a surface of the laminated paper other than the outer surface of the crepe paper, A product made by processing the laminated paper described in claim 19, characterized in that the crepe paper on the side of the laminated paper on which the printed portion is provided is set to a thickness that increases the visibility of the printed portion from the outside when the crepe paper is moistened.

22. 20. A product produced by processing a laminated paper according to claim 19, characterized in that the printed portion is formed on the nonwoven fabric in the laminated paper by flexographic printing.

23. A paper towel made by subjecting laminated paper to a moisture-containing treatment, The laminated paper is The crepe paper that matches the and a nonwoven fabric as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers, The crepe paper is heat-sealed to the intermediate layer sheet by a linear heat-sealing portion row extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend to form a laminated structure; The laminated paper is The crepe rate of the crepe paper is set within a predetermined crepe rate range, and the interval between the heat-sealed portions in the width direction of the row of heat-sealed portions is set within a predetermined interval between the heat-sealed portions; The laminated paper is The crepe rate of the crepe paper is set to one of the predetermined crepe rates within a range of 20% to 40% as the predetermined crepe rate range, and the widthwise spacing of the heat-sealed portions of the row of heat-sealed portions is set to one of the predetermined spacings of the heat-sealed portions within a range of 10 mm to 25 mm as the predetermined spacing range of the heat-sealed portions; the laminated paper has a non-fused portion between the adjacent rows of heat-sealed portions, The non-fused portion of the laminated paper expands after the laminated paper absorbs water to form an expanded portion, and the expanded portion is configured to form a wide expanded portion and a narrow expanded portion, The expanded portion of the laminated paper has expanded wrinkles which are different from the crepe wrinkles of the crepe paper and are larger in size than the crepe wrinkles, and the expanded wrinkles include large expanded wrinkles which extend over almost the entire width of the wide expanded portion and medium expanded wrinkles which extend over almost the entire width of the narrow expanded portion, The expanded large wrinkles of the laminated paper are composed of first expanded large wrinkles in which some of the crepe wrinkles do not disappear and remain mixed with the expanded large wrinkles, and second expanded large wrinkles in which the crepe wrinkles have completely disappeared, The expansion wrinkles of the laminated paper are composed of first expansion wrinkles in which some of the crepe wrinkles do not disappear but remain and are mixed with the expansion wrinkles, and second expansion wrinkles in which the crepe wrinkles have completely disappeared, The first large expansion wrinkles, the second large expansion wrinkles, the first medium expansion wrinkles, and the second medium expansion wrinkles of the laminated paper remain not only when the laminated paper is moistened, but also after the laminated paper is moistened and then dried, The present invention also provides a paper towel produced by processing the laminated paper, the paper towel further comprising a printed portion.

24. The printed portion is provided on either the crepe paper or the nonwoven fabric in the laminated paper, 24. The paper hand towel produced by processing the laminated paper according to claim 23, wherein the printed portion is a pattern portion consisting of a single color pattern or a multi-color pattern, or an advertising portion consisting of advertising content.

25. The printed portion is provided on a surface of the laminated paper other than the outer surface of the crepe paper, A paper towel made by processing the laminated paper described in claim 23, characterized in that the crepe paper on the side of the laminated paper on which the printed portion is provided is set to a thickness that increases the visibility of the printed portion from the outside when the crepe paper is moistened.

26. 24. The paper hand towel produced by processing the laminated paper according to claim 23, wherein the printed portion is formed on the nonwoven fabric in the laminated paper by flexographic printing.

27. The printed portion is formed on the nonwoven fabric of the laminated paper by flexographic printing with a water-based ink or a UV ink, Both sides of the nonwoven fabric are completely covered with the crepe paper, 24. A paper hand towel produced by processing the laminated paper according to claim 23, characterized in that the laminated paper is water-absorbed and in a wet state.

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