Laminated paper, products made by processing laminated paper, paper towels, laminated paper manufacturing device, and heat seal roller for laminated paper manufacturing device

Abstract

To provide a product using laminated paper having high added-value functions and dramatically improved performance compared to conventional products, and to provide a laminated paper manufacturing device. [Solution] The laminated paper consists of a pair of crepe papers as outer layer sheets and a heat-sealable intermediate layer sheet arranged in a stacked state between the pair of crepe papers.The crepe paper is heat-sealed to the intermediate layer sheet using a heat-sealing means to form a linear row of heat-sealed portions extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend, thereby heat-sealing the crepe paper to the intermediate layer sheet to form a laminated structure.

Description

[Technical Field]

[0001] The present invention relates to laminated paper, products made by processing laminated paper, paper hand towels, a laminated paper manufacturing device, and a heat seal roller for a laminated paper manufacturing device. [Background technology]

[0002] Conventional inventions relating to laminated paper that can be used for paper towels and the like include the inventions disclosed in Patent Document 1 and Patent Document 2, which are inventions or devices of the present inventor. In these inventions, moisture-absorbent paper with crepe and a heat-fusible sheet (moisture-absorbent paper or nonwoven fabric blended with synthetic fibers) are laminated together, a heat-set section or heat-sealed section is formed so as to extend in a direction approximately perpendicular to the crepe of the moisture-absorbent paper, and these are integrated by heat fusion. These inventions can provide laminated paper that is pleasant to the touch and has excellent appearance and usability, and can also be heat-sealed at low temperatures, facilitating processing and reducing manufacturing costs.

[0003] Furthermore, the inventor has also made improvements to conventional laminated paper having the above-mentioned excellent effects in the inventions described in Patent Documents 3 and 4. These inventions can provide laminated paper that significantly improves the fusion strength of the heat-sealed portions of the crepe paper and the heat-fusible sheet, and also increases the overall volume, further improving the appearance. In other words, the laminated paper according to these inventions can obtain sufficient fusion strength even with a small fusion area, and can also increase the overall volume. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 4-24480 [Patent Document 2] Publication No. 4-15116 [Patent Document 3] Japanese Patent Application Publication No. 11-342090 [Patent Document 4] Japanese Patent Application Laid-Open No. 2003-39581 Summary of the Invention [Problem to be solved by the invention]

[0005] The inventions of Patent Documents 1 to 4 all exhibit primarily functional effects, such as significantly improving the texture, appearance, and usability of laminated paper when it is embodied in paper towels or the like, significantly improving the fusion strength between the absorbent paper and the heat-fusible sheet that make up the laminated paper, and significantly increasing the overall volume, thereby providing significant commercial advantages. Meanwhile, the present inventor conceived of imparting additional value-added functionality to conventional laminated paper during or after the processing of the laminated paper as a raw material into a final product such as paper towels, and sought to develop a novel laminated paper and a manufacturing method thereof that would dramatically improve the performance of the laminated paper compared to conventional paper. The present inventor then continued research and development into laminated paper with such added-value functionality and dramatically improved performance compared to conventional paper, a manufacturing method for manufacturing the laminated paper, a manufacturing device for manufacturing the laminated paper, and a manufacturing device used in the manufacturing method, and through repeated trial and error, he finally arrived at the present invention.

[0006] In other words, the present invention aims to provide laminated paper, products made from processed laminated paper, paper towels, a laminated paper manufacturing device, and a heat seal roller for a laminated paper manufacturing device that have high added-value functions and dramatically improved performance compared to conventional devices. [Means for solving the problem]

[0007] A laminated paper according to a first aspect of the present invention comprises a pair of crepe papers and a nonwoven fabric serving as a heat-sealable intermediate layer sheet disposed between the pair of crepe papers in a laminated state, and the crepe papers are heat-sealed to the intermediate layer sheet by a linear heat-sealed portion row extending perpendicular to the direction of extension of the crepe wrinkles of the crepe papers to form a laminated structure. The heat-sealed portion row is formed by arranging straight heat-sealed portions of a constant length and a constant width in a broken line at regular intervals in the longitudinal direction, and each heat-sealed portion in the heat-sealed portion row has both longitudinal ends curved into a flat semicircular shape.

[0008] In a product made by processing laminated paper according to a second aspect of the present invention, the laminated paper comprises a pair of crepe papers and a nonwoven fabric as a heat-sealable intermediate layer sheet arranged 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 row of heat-sealed portions extending in a direction perpendicular to the direction of extension of the crepe wrinkles of the crepe paper to form a laminated structure. The row of heat-sealed portions is composed of straight line-shaped heat-sealed portions of a constant length and a constant width arranged in a broken line at regular intervals in the longitudinal direction, and both longitudinal ends of each heat-sealed portion in the row of heat-sealed portions are curved into a flat semicircular shape.

[0009] A laminated paper according to a third aspect of the present invention comprises a pair of crepe papers and a heat-sealable intermediate layer sheet of nonwoven fabric laminated between the pair of crepe papers, and the crepe papers are heat-sealed to the intermediate layer sheet by a linear array of heat-sealed portions extending perpendicular to the direction of crepe wrinkles in the crepe paper to form a laminated structure. The array of heat-sealed portions is formed by linear heat-sealed portions of a constant length and width arranged in a broken line at regular intervals along the length, and each heat-sealed portion in the array of heat-sealed portions has both longitudinal ends curved into a flat semicircular shape. The laminated paper further has a printed portion.

[0010] In a fourth aspect of the present invention, a product obtained by folding laminated paper comprises a pair of crepe papers and a heat-sealable intermediate layer sheet of nonwoven fabric arranged 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 row of heat-sealed portions extending perpendicular to the direction of crepe wrinkles in the crepe paper to form a laminated structure. The row of heat-sealed portions is formed by linear heat-sealed portions of constant length and width arranged in a broken line at regular intervals along the length, and each heat-sealed portion in the row of heat-sealed portions has both longitudinal ends curved into a flat semicircular shape. The laminated paper further has a printed portion.

[0011] In a paper towel made by moisture-imparting laminated paper according to a fifth aspect of the present invention, the laminated paper comprises a pair of crepe papers and a nonwoven fabric as a heat-sealable intermediate layer sheet arranged 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 row of heat-sealed portions extending in a direction perpendicular to the direction of extension of crepe wrinkles in the crepe paper to form a laminated structure. The row of heat-sealed portions is formed by arranging straight line-shaped heat-sealed portions of constant length and width in a broken line at regular intervals in the longitudinal direction, and both longitudinal ends of each heat-sealed portion in the row of heat-sealed portions are curved into a flat semicircular shape.

[0012] In a paper towel according to a sixth aspect of the present invention, the laminated paper is made of a pair of crepe papers and a heat-sealable intermediate layer sheet of nonwoven fabric laminated between the pair of crepe papers, and the crepe papers are heat-sealed to the intermediate layer sheet by a linear row of heat-sealed portions extending in a direction perpendicular to the direction of crepe wrinkles in the crepe paper to form a laminated structure. The row of heat-sealed portions is formed by arranging straight line-shaped heat-sealed portions of constant length and width in a broken line at regular intervals along the length, and each heat-sealed portion in the row of heat-sealed portions has both longitudinal ends curved into a flat semicircular shape. The paper towel further has a printed portion. [Effects of the Invention]

[0013] The laminated paper, products made from processed laminated paper, laminated paper manufacturing apparatus, and heat seal roller of the laminated paper manufacturing apparatus of the present invention can provide laminated paper and products made from processed laminated paper that have high added-value functions and have performance that is dramatically improved over conventional methods. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a plan view showing a first specific example (laminated paper having a pattern portion) of laminated paper (laminated paper having a printed portion) according to the first embodiment of the present invention. [Figure 2] Figure 2 is an enlarged plan view of the laminated paper according to embodiment 1 of the present invention, taken along line AA in Figure 1, where (a) shows the dry state of the laminated paper according to embodiment 1, and (b) shows the swollen state of the laminated paper according to embodiment 1 when it absorbs water. [Figure 3] FIG. 3 is a plan view showing a second specific example of the laminated paper sheet according to the first embodiment of the present invention (a laminated paper sheet having an advertising section). [Figure 4] FIG. 4 is a side view showing the laminated paperboard according to the first embodiment of the present invention. [Figure 5] FIG. 5 is a cross-sectional view showing the laminated paper according to the first embodiment of the present invention cut in the horizontal direction, and shows an enlarged view of the area where the printed layer is provided within the dashed-dotted circle. [Figure 6] Figure 6 is a cross-sectional view showing a laminated paper (laminated paper having a printed portion) according to embodiment 2 of the present invention, cut horizontally, and shows an enlarged view of the circular portion indicated by the dotted line (the portion where the printed layer is provided). [Figure 7] FIG. 7 is an enlarged cross-sectional view showing a laminated paper sheet (a laminated paper sheet having a plurality of intermediate layer sheets) according to a third embodiment of the present invention, cut in the horizontal direction. [Figure 8] FIG. 8 is an enlarged cross-sectional view showing a laminated paperboard (a laminated paperboard having a water-impermeable intermediate layer sheet) according to a fourth embodiment of the present invention, cut in the horizontal direction. [Figure 9] FIG. 9 is a side view that schematically shows a laminated paper manufacturing apparatus (heat seal roller type laminated paper manufacturing apparatus) according to a fifth embodiment of the present invention. [Figure 10]FIG. 10 is a side view showing a schematic diagram of a heat seal roller of a laminated paper manufacturing device according to embodiment 5 of the present invention, and shows an enlarged circular portion indicated by a dotted line to explain the linear thermocompression bonding protrusions. [Figure 11] FIG. 11 is an explanatory diagram for explaining the step of forming a linear heat-sealed portion in a laminated papermaking device according to a fifth embodiment of the present invention, and is an explanatory diagram showing a heat seal roller portion as viewed from the side. [Figure 12] Figure 12 is an explanatory diagram for explaining the process of forming a linear heat-sealed portion using a laminated paper manufacturing apparatus according to embodiment 5 of the present invention, and is an explanatory diagram showing a cross section of the internal structure of a heat seal roller corresponding to Figure 11 cut at an end surface. [Figure 13] Figure 13 is an explanatory diagram showing the configuration of the linear thermocompression protrusions of the heat seal rollers of the laminated paper manufacturing apparatus relating to embodiment 5 of the present invention, where the upper figure is an oblique view showing a portion of a pair of heat seal rollers, the central figure is a cross-sectional view showing an enlarged cross-section of the circular portion indicated by the dotted line in the upper figure to explain the state in which the linear thermocompression protrusions of the pair of heat seal rollers mesh with each other to press the raw material sheets of the laminated paper, and the lower figure is a cross-sectional view showing an enlarged circular portion indicated by the dotted line in the center of the central figure to explain the shape of the linear thermocompression protrusions of the pair of heat seal rollers. [Figure 14] Figure 14 shows an example of a laminated paper according to embodiment 1 of the present invention, in which the width between linear heat-sealed portions is changed depending on the crepe rate, where (a) is an enlarged plan view of a portion of the laminated paper showing a case in which the spacing (width) between adjacent linear heat-sealed portions is a first width corresponding to a first crepe rate, and (b) is an enlarged plan view of a portion of the laminated paper showing a case in which the spacing (width) between adjacent linear heat-sealed portions is a second width corresponding to a second crepe rate. [Figure 15]Figure 15 is a graph for explaining a preferred specific example of a method for manufacturing laminated paper using a laminated paper manufacturing apparatus relating to embodiment 5 of the present invention, where (a) is an explanatory diagram showing the relationship between the feed speed of the laminated paper raw material sheet by the laminated paper manufacturing apparatus and the thermocompression temperature of the heat seal roller of the laminated paper manufacturing apparatus, (b) is an explanatory diagram showing the relationship between the thermocompression temperature of the heat seal roller of the laminated paper manufacturing apparatus and the thickness of the base paper of the laminated paper raw material sheet (base paper thickness), (c) is an explanatory diagram showing the relationship between the feed speed of the laminated paper raw material sheet by the laminated paper manufacturing apparatus and the base paper thickness of the laminated paper raw material sheet, and (d) is an explanatory diagram showing the relationship between the thermocompression temperature of the heat seal roller of the laminated paper manufacturing apparatus and the thickness of the nonwoven fabric of the laminated paper raw material sheet (nonwoven fabric thickness). [Figure 16] FIG. 16 is a side view that schematically shows a laminated paper manufacturing device (high frequency perforation type laminated paper manufacturing device) according to a sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described. Note that throughout the embodiments, the same members, elements, or portions will be designated by the same reference numerals, and descriptions thereof will be omitted.

[0016] Embodiment 1 (Laminated paper with a printed portion provided on a nonwoven fabric) [Overall structure of laminated paper] The laminated paper of the first embodiment is embodied as laminated paper 10 having a printed portion, as shown in Figures 1 to 5. First, the overall structure of laminated paper 10 will be described. As shown in Figure 1, in a plan view (or bottom view) of laminated paper 10, laminated paper 10 is formed in the shape of a sheet having a predetermined outline (typically a rectangular shape such as a rectangle). On the other hand, in a side view (or cross-sectional view) of laminated paper 10, as shown in the side view of Figure 4, laminated paper 10 has a laminated structure consisting of crepe paper 1 as an outer-layer sheet constituting a pair of outer layers, and nonwoven fabric 2 as an intermediate-layer sheet constituting an intermediate layer interposed between the pair of outer layers. Furthermore, laminated paper 10 maintains the laminated structure by heat-sealing one and the other of the pair of crepe paper 1 to one and the other of the nonwoven fabric 2 at the same locations. In other words, the laminated paper 10 is heat-sealed to the nonwoven fabric 2 at the same locations by heat-sealing a pair of crepe papers 1 to the nonwoven fabric 2 at each of the first heat-sealing sections 11a and the second heat-sealing sections 11b that respectively constitute the heat-sealing section row 11 (the first heat-sealing section row 11A and the second heat-sealing section row 11B).

[0017] [Heat-sealed part] To explain the heat-sealed portions 11 in more detail, the laminated paper 10 has a single row of heat-sealed portions 11, each row formed in the shape of a broken line, extending across the entire length of the laminated paper 10 (the direction in which the base paper is fed during manufacturing, the vertical direction in Figure 1). The laminated paper 10 also has multiple rows of heat-sealed portions 11 arranged side by side across the entire width of the laminated paper 10 (the direction perpendicular to the direction in which the base paper is fed during manufacturing, the horizontal direction in Figure 1), so that the rows are parallel to each other at regular intervals. This allows the laminated paper 10 to have linear band-like non-fused portions 12 between adjacent rows of heat-sealed portions 11. In other words, the laminated paper 10 has multiple rows of non-fused portions 12 arranged side by side across the entire width of the laminated paper 10, so that the rows are parallel to each other at regular intervals. In the laminated paper 10, the multiple rows of heat-sealed portions 11 are composed of a first row of heat-sealed portions 11A, which are made up of first heat-sealed portions 11a arranged in a line at regular intervals in the length direction of the laminated paper 10, and a second row of heat-sealed portions 11B, which are made up of second heat-sealed portions 11b arranged in a line at regular intervals in the length direction of the laminated paper 10. In other words, the first row of heat-sealed portions 11A, which is made up of the first heat-sealed portions 11a, and the second row of heat-sealed portions 11B, which is made up of the second heat-sealed portions 11b, are arranged alternately in parallel at regular intervals in the width direction of the laminated paper 10. 2, the first heat-sealed portions 11a form straight line-shaped fused portions of a predetermined length and width in the laminated paper 10, and by arranging these first heat-sealed portions 11a of a predetermined length and width linearly at regular intervals in the longitudinal direction, a first broken line-shaped heat-sealed portion row 11A is formed. The second heat-sealed portions 11b form straight line-shaped fused portions of the same length and width as the first heat-sealed portions 11a, and by arranging these second heat-sealed portions 11b of a predetermined length and width linearly at regular intervals in the longitudinal direction, a second broken line-shaped heat-sealed portion row 11B is formed similar to the first heat-sealed portion row 11A.The first heat-sealed portion 11a of the first row of heat-sealed portion rows 11A and the second heat-sealed portion 11b of the second row of heat-sealed portion rows 11B (i.e., adjacent rows of heat-sealed portion rows 11A and 11B) are arranged so that their positions in the longitudinal direction of the laminated paper 10 are offset from each other so that the longitudinal center position of the first heat-sealed portion 11a of the first row of heat-sealed portion rows 11A is located at the middle position of the gap between adjacent second heat-sealed portions 11b of the second row of heat-sealed portion rows 11B.

[0018] [Non-fused area] As shown in Figure 4, the laminated paper 10 forms a linear band-shaped non-fused portion 12 between two adjacent rows of heat-sealed portions 11, and this non-fused portion 12 expands to form an expanded portion after the laminated paper 10 absorbs water. Specifically, as shown in Figures 1 and 2, the non-fused portion 12 is composed of a wide expanded portion 12a (which will form the wide expanded portion after the laminated paper 10 absorbs water) and a narrow expanded portion 12b (which will form the narrow expanded portion after the laminated paper 10 absorbs water). More specifically, the wide expanded portion 12a is provided in the laminated paper 10 in a non-overlapping range (non-overlapping range) where the adjacent first row of heat-sealed portion rows 11A and second row of heat-sealed portion rows 11B do not overlap, as a substantially rectangular portion having the length and width of the non-overlapping range. For example, in Figure 2, the wide expansion section 12a is arranged in a roughly rectangular shape in the longitudinal middle range where the first heat-sealed section 11a of the first heat-sealed section row 11A, the second row from the left, and the second heat-sealed section 11b of the second heat-sealed section row 11B, the third row from the left, do not overlap each other, over the length range between the ends (between one end and the other end) of the first heat-sealed sections 11a adjacent to each other in the first heat-sealed section row 11A, and across the width range from the right edge of the first heat-sealed section row 11A to the left edge of another first heat-sealed section row 11A (in Figure 2, the first heat-sealed section row 11A, the fourth row from the left) that faces the second heat-sealed section row 11B. On the other hand, the narrow expansion portions 12b are each provided in the laminated paper 10 in the area (overlapping area) where adjacent first and second rows of heat-sealed portions 11A and 11A overlap, as small, approximately rectangular portions having the length and width of the overlapping area. For example, in Figure 2, the narrow expansion section 12b is arranged in a roughly rectangular shape in the range of the longitudinal ends where the first heat-sealed section 11a of the first heat-sealed section row 11A, the second row from the left, and the second heat-sealed section 11b of the second heat-sealed section row 11B, the third row from the left, overlap each other, over a length range from one end (e.g., the upper end) of the first heat-sealed section 11a of the first heat-sealed section row 11A to the other end (lower end) of the second heat-sealed section 11b of the adjacent second heat-sealed section row 11B, and over a width range from the right edge of the first heat-sealed section row 11A to the left edge of the second heat-sealed section row 11B.

[0019] [Wrinkles in the non-fused area (expanded area)] In the laminated paper 10, the non-fused portion 12 does not bond the outer crepe paper 1 to the middle nonwoven fabric 2, and the non-fused portion 12 of the crepe paper 1 is not constrained by the heat-fused portions 11a and 11b of the heat-fused portion row 11 (i.e., the portion that is not fixed to the nonwoven fabric 2), and is therefore free to move and deform in the thickness direction, etc., relative to the nonwoven fabric 2. In particular, the amount of movement of the crepe paper 1 is relatively small in the portion of the non-fused portion 12 that is close to the heat-fused portion row 11 (i.e., the boundary portion with the heat-fused portion row 11), but the amount of movement of the crepe paper 1 is relatively large in the portion of the non-fused portion 12 that is farther away from the heat-fused portion row 11 (i.e., the central portion between adjacent heat-fused portion rows 11), and the amount of movement of the crepe paper 1 is greatest at the central position between adjacent heat-fused portion rows 11. Furthermore, in the laminated paper 10, in each of the non-fused portions 12 (i.e., each of the wide expanded portions 12a and each of the narrow expanded portions 12b) of the crepe paper 1, which constitute the two outer layers, numerous crepe wrinkles, which are small wrinkles inherent to the crepe paper 1, appear before the laminated paper 10 is first hydrated. These crepe wrinkles are small wrinkles that extend in the width direction of the laminated paper 10 (and in the width direction of the crepe paper 1), and are formed during the manufacturing of the crepe paper 1.

[0020] On the other hand, after the laminated paper 10 is initially hydrated, in each of the non-fused portions 12 (wide expanded portions 12a and narrow expanded portions 12b) of the crepe paper 1, the crepe paper 1 expands through the crepe wrinkles, i.e., the small crepe wrinkles expand with moisture, forming wrinkles (larger than the original crepe wrinkles, hereinafter referred to as "expansion wrinkles") different from the original crepe wrinkles of the crepe paper 1, as shown in Figure 2. In this case, in the crepe paper 1, adjacent crepe wrinkles expand with moisture and merge to form a single expansion wrinkle corresponding to the multiple crepe wrinkles, and it can be considered that in the expansion wrinkle portion, all or part of the crepe wrinkles that were the source of the expansion wrinkles disappear. Furthermore, the expanded wrinkles of this crepe paper 1 in the wide expanded portion 12a are large wrinkles (hereinafter referred to as "large expanded wrinkles") that extend across almost the entire width of the wide expanded portion 12a, while in the narrow expanded portion 12b they are medium-sized wrinkles (hereinafter referred to as "medium expanded wrinkles") that extend across almost the entire width of the narrow expanded portion 12b. Both the large expanded wrinkles and the medium expanded wrinkles are larger than the crepe wrinkles. Examples of the large expanded wrinkles 12aw and the medium expanded wrinkles 12bw are shown in Figure 14. Furthermore, in the non-fused portion 12 of the crepe paper 1, not all the crepe wrinkles are transformed into the large expanded wrinkles or the medium expanded wrinkles, and some crepe wrinkles remain in the crepe paper 1 as they are (in their original small wrinkle state). Additionally, the inventors have discovered that in the laminated paper 10, in the non-fused portions 12 of the crepe paper 1, there are two types of large expansion wrinkles in the wide expanded portions 12a. That is, the inventors have discovered that there are two types of large expansion wrinkles: a first type (hereinafter referred to as "mixed large and small wrinkles") in which some of the crepe wrinkles do not disappear but remain (i.e., are mixed) with the large expansion wrinkles, and a second type (hereinafter referred to as "complete large wrinkles") in which the crepe wrinkles have completely disappeared. Similarly, the inventors have discovered that in the laminated paper 10, in the non-fused portions 12 of the crepe paper 1, there are two types of medium expansion wrinkles in the narrow expanded portions 12b. That is, the inventors have classified the expanded wrinkles into a first type of expanded wrinkles (hereinafter referred to as "mixed small and medium wrinkles") in which some of the crepe wrinkles do not disappear but remain together with the expanded wrinkles (i.e., are mixed).It has been found that there are two types of expanded medium wrinkles (hereinafter referred to as "complete medium wrinkles"), in which the crepe wrinkles have completely disappeared, and a second type of expanded medium wrinkles (hereinafter referred to as "complete medium wrinkles") in which the crepe wrinkles have completely disappeared. Furthermore, in the crepe paper 10, these expanded large wrinkles, expanded medium wrinkles, mixed large and small wrinkles, mixed medium and small wrinkles, complete large wrinkles, and complete medium wrinkles basically remain in their original state even after the laminate paper 10 is dried after absorbing water.

[0021] As a result, in the laminated paper 10 after hydration, both when hydrating and when drying after hydration, the expanded large wrinkles, expanded medium wrinkles, mixed large and small wrinkles, mixed medium and small wrinkles, complete large wrinkles, and complete medium wrinkles are mixed together, and in particular, the sets of expanded large wrinkles, mixed large and small wrinkles, and complete large wrinkles, as well as the sets of expanded medium wrinkles, mixed medium and small wrinkles, and complete medium wrinkles are alternately present in the wide expanded section 12a and the narrow expanded section 12b, respectively, thereby achieving the unique effect of increasing the sense of volume in a balanced manner across both sides of the laminated paper 10.

[0022] [Dimensions of heat-sealed parts and spacing between heat-sealed parts] In the laminated paper 10, each row of heat-sealed sections 11 is composed of first heat-sealed sections 11a, which are straight line segments of a fixed length and width, arranged in a broken line at regular intervals along the length, and second heat-sealed sections 11b, which are straight line segments of a fixed length and width, arranged in a broken line at regular intervals along the length, offset from the first heat-sealed sections 11a (i.e., so that the midpoint of each second heat-sealed section 11b coincides with the midpoint of the interval between the first heat-sealed sections 11a). Furthermore, because the first heat-sealed sections 11a and the second heat-sealed sections 11b are set to the same length and width, the first heat-sealed sections 11a and the second heat-sealed sections 11b have the same configuration, except for the fact that they are arranged at offset positions along the length as described above. Meanwhile, the length and width of the first heat-sealed portion 11a and the second heat-sealed portion 11b in the laminated paper 10 are set to predetermined lengths and widths. That is, the length and / or width of each of the first heat-sealed portion 11a and each of the second heat-sealed portion 11b are appropriately set according to the external dimensions of a single sheet of the laminated paper 10 when in use (i.e., appropriately set according to the length and width dimensions, etc., determined according to the intended use of the laminated paper 10).

[0023] Specifically, for example, when the laminated paper 10 is used for paper towels, the length of each heat-sealed portion 11a, 11b is set to any value within the range of 35 mm to 45 mm, preferably within the range of 38 mm to 42 mm, and more preferably approximately 40 mm. The width of each heat-sealed portion 11a, 11b is set to any value within the range of 1.5 mm to 2.5 mm, and preferably approximately 2 mm. The length-to-width ratio (aspect ratio) of each heat-sealed portion 11a, 11b is preferably set to any ratio within the range of 13:1 to 23:1, and more preferably approximately 20:1. That is, it is preferable that the width of each heat-sealed portion 11a, 11b be set to approximately 5% of the length (or the length be set to approximately 20 times the width). Furthermore, in each row of heat-sealed portions 11 of the laminated paper 10, the distance between adjacent heat-sealed portions 11A, 11b in the longitudinal direction (hereinafter referred to as the "longitudinal heat-sealed portion distance") is set to any value within the range of 18 mm to 22 mm, preferably approximately 20 mm. The ratio of the length of each heat-sealed portion 11a, 11b to the distance between the heat-sealed portions is preferably set to 2:1. That is, the longitudinal distance between the heat-sealed portions 11 in each row is preferably set to approximately 50% of the length of the heat-sealed portions 11a, 11b (or the length of the heat-sealed portions 11a, 11b is preferably set to approximately twice the distance between the heat-sealed portions). This maintains the excellent bonding strength between the crepe paper 1 and the nonwoven fabric 2 provided by the heat-sealed portion row 11 while maximizing the expansion rate of the crepe 1 provided by the non-fused portions 12, thereby maintaining the optimal volume of the laminated paper 10.

[0024] [End shape of heat-sealed part] Furthermore, both longitudinal ends of each heat-sealed portion 11a, 11b are curved in a planar semicircular shape. This effectively prevents the crepe paper 1 from peeling off from the nonwoven fabric 2 at the ends of each heat-sealed portion 11a, 11b, compared to when the ends of each heat-sealed portion are rectangular (i.e., when the corners of the ends are right angles). As will be described later, in this case, both longitudinal ends of the heat-sealed surface of the heat-sealed protrusion of the heat-seal roller, which constitutes the heat-sealed portion forming means in the laminated paper manufacturing apparatus, are also curved in a planar semicircular shape. Therefore, compared to when the ends of each heat-sealed surface are rectangular (i.e., when the corners of the ends are right angles), the raw material sheet of the crepe paper 1 is subjected to pressure from the heat-sealed surface of the heat-sealed roller when the heat-sealed portion is formed by the heat-sealed surface, but is not damaged by excessive pressure concentration at the ends of the heat-sealed surface. This improves the manufacturing yield and the quality of the laminated paper 10. (That is, as will be described later, when the end of the thermocompression-bonded surface forms a right-angle corner, stress is concentrated on the raw material sheet of crepe paper 1 at the corner, increasing the possibility of the raw material sheet breaking at the corner, compared to when the thermocompression-bonded surface is curved.)

[0025] [Crepe rate of crepe paper] In the laminated paper 10, the crepe rate of the crepe paper 1 is set to any value within the range of 20% to 40%, preferably any value within the range of 20% to 30%, and more preferably set to a value of approximately 30%. In other words, if the crepe rate of the crepe paper 1 is less than 20%, there is a high possibility that the crepe paper 1 will not expand or swell sufficiently when the laminated paper 10 is soaked in water after being laminated and joined to the nonwoven fabric 2 to form the laminated paper 10. On the other hand, if the crepe rate of the crepe paper 1 is greater than 40%, it will be difficult to make the raw material sheet of the crepe paper 1 in a papermaking machine during production (i.e., during papermaking).

[0026] [Crepe rate of crepe paper and spacing of heat-sealed parts] 14, the arrangement intervals LW1, LW2 of the heat-sealed portion rows 11 in the laminated paper 10 (i.e., the distance between the widthwise centerlines of adjacent heat-sealed portion rows 11; hereinafter, referred to as the "widthwise heat-sealed portion spacing") are set to any value 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 a range of 20% to 26%, the widthwise heat-sealed portion spacing is preferably set to any value within a range of 10 mm to 15 mm as the first widthwise heat-sealed portion spacing LW1 (which is a relatively small dimension) (i.e., the lower limit is preferably 10 mm and the upper limit is preferably 15 mm), and the widthwise heat-sealed portion spacing is preferably increased in proportion to the increase in the crepe rate within this widthwise heat-sealed portion spacing range. Furthermore, when the crepe rate of the crepe paper 1 is within the range of 26% to 30%, the widthwise heat-sealed portion spacing (second widthwise heat-sealed portion spacing LW2, which is a relatively large dimension) is preferably set to any value within the range of 15 to 25 mm (i.e., the lower limit is preferably 15 mm and the upper limit is preferably 25 mm), and within this widthwise heat-sealed portion spacing range, it is preferable to increase the widthwise heat-sealed portion spacing in proportion to the increase in the crepe rate.If the widthwise heat-sealed portion spacings LW1 and LW2 in the laminated paper 10 are smaller than the above-mentioned lower limit, there is a high possibility that the crepe paper 1 will not expand or swell sufficiently when the laminated paper 10 absorbs water. On the other hand, if the widthwise heat-sealed portion spacings LW1, LW2 in the laminated paper 10 are greater than the upper limit values, the large expanded wrinkles and medium expanded wrinkles will expand or stretch more than the expected expansion rate when the laminated paper 10 absorbs water, causing the large expanded wrinkles and medium expanded wrinkles to sag and potentially degrade the quality of the laminated paper 10. For example, the inventors have experimentally confirmed that if the widthwise heat-sealed portion spacings LW1, LW2 in the laminated paper 10 are 30 mm or more (i.e., a value significantly exceeding 25 mm, specifically a value that is 125% or more of 25 mm), the large expanded wrinkles and medium expanded wrinkles will expand or stretch too much when the laminated paper 10 absorbs water, causing them to sag.In other words, even if the crepe rate of the crepe paper 1 is 30%, which is the maximum value of the above range, if the widthwise heat-sealed portion spacing LW1, LW2 in the laminated paper 10 is 30 mm or more, when the laminated paper 10 absorbs water, the large expanded wrinkles, medium expanded wrinkles, etc. will expand or stretch too much and become loose.

[0027] [Pattern part as printing part] As shown in FIG. 1, the laminated paper 10 can be embodied as a laminated paper 10 having a pattern section 13 as a first specific example of a printed section. In detail, the pattern section 13 can be configured, for example, as shown in FIG. 2, by arranging unit patterns 13a and 13b of the same motif over the entire surface or a certain area of ​​the laminated paper 10. In FIG. 2, for example, the unit pattern 13a is a pattern of a predetermined size using a corolla (a collection of petals) motif of a predetermined type of flower, while the unit pattern 13b is a pattern of a larger size using the same corolla motif as the unit pattern 13a. The configuration of the pattern section 13 is not limited to that shown in FIG. 2, and any pattern can be used. That is, the pattern section 13 can use unit patterns of a motif different from the unit patterns 13a and 13b shown in FIG. 2, and can also be any pattern formed by combining unit patterns of various motifs in addition to unit patterns of the same motif. Alternatively, the pattern section 13 may be configured using individual unit patterns as shown in FIG. 2 , or may be configured using a pattern consisting of repeating designs such as a grid pattern or a checkerboard pattern. Alternatively, the pattern section 13 may be configured as a monochromatic pattern (all-over monochromatic pattern) obtained by printing an arbitrary monochromatic color different from the original base color of the laminated paper 10 (particularly the base color of the crepe paper 1) on the entire surface of the laminated paper 10, or as a monochromatic pattern (partial monochromatic pattern) obtained by printing an arbitrary monochromatic color different from the original base color of the laminated paper 10 on a partial area of ​​the laminated paper 10. Alternatively, the pattern section 13 may be configured as a pattern obtained by randomly printing two or more distinct colors on the entire surface or a partial area of ​​the laminated paper 10 (hereinafter referred to as a "multi-color pattern"). In short, the pattern section 13 may be configured in any way as long as it can impart a distinct visual effect to the laminated paper 10 by printing an arbitrary color different from the base color of the ordinary laminated paper 10 on the laminated paper 10.

[0028] [Advertising department as a printing department] Furthermore, as shown in FIG. 3, the laminated paper 10 can be embodied as a laminated paper 10 having an advertising section 14 as a second specific example of a printed section. In detail, the advertising section 14 can be configured, for example, to have advertising space 14b and advertising space 14c within the inner area of ​​an outer frame 14a. In this case, the advertising section 14 can be configured, for example, by printing the title and copy of specific advertising content in advertising space 14b and printing details of the advertising content (such as product descriptions and images corresponding to the products) in advertising space 14c. Note that in FIG. 3, the outer frame 14a, advertising space 14b, and advertising space 14c of the advertising section 14 are each outlined with dashed lines, but this is merely a way of explaining the extent of the outer frame 14a, advertising space 14b, and advertising space 14c. (Of course, they can also be drawn intentionally.) Normally, the outlines of the outer frame 14a, advertising space 14b, and advertising space 14c are not drawn on the laminated paper 10. Furthermore, the outer frame 14a of the advertising section 14 is provided for convenience to illustrate an example of advertising content. It is also possible to implement the entire advertising section as advertising frames 14a and 14b without providing the outer frame 14a. The number of advertising frames 14a and 14b can also be one, or any number of frames, such as two or more. Furthermore, the configuration of the advertising section 14 is not limited to that shown in FIG. 2 and can be any configuration. That is, the advertising section 14 can be configured to print any advertising content or content in any expression mode or format, as long as it is advertising content printed on advertising print media such as ordinary flyers or promotional items. Furthermore, the content or content printed on the advertising section 14 can be any content, such as a company name, logo, or brand. Furthermore, the laminated paper 10 with a printing section can be used for novelty goods such as paper towels that are distributed in large quantities to announce or advertise various information such as sales information at retail stores or company campaign information, or for novelty goods such as paper towels that are distributed in large quantities to announce or publicize various events (festivals) such as the Olympics or expositions.

[0029] [Printing unit structure] Next, the structure of the printed portion of laminated paper 10 will be described. As shown in the specific examples in Figures 5, 6, 7, and 8, one of the main features of laminated paper 10 is that a printed portion is printed using a predetermined printing ink on one surface other than the outer surface of crepe paper 1 serving as an outer layer sheet, which is disposed inside laminated paper 10. In addition, another main feature of laminated paper 10 is that the thickness (basis weight) of at least the crepe paper 1 serving as the outer layer sheet on which the printed portion is provided is set, and, if necessary, the material (paper quality) is also set together with the thickness, so that the printed portion is visible from the outside through the crepe paper 1 serving as the outer layer sheet of laminated paper 10 even when the laminated paper 10 is dry, and the transparency of the printed portion through the crepe paper 1 serving as the outer layer sheet of laminated paper 10 increases when the laminated paper 10 absorbs water, thereby increasing visibility from the outside. Specifically, in embodiment 1, the laminated paper 10 has a multi-layer structure (a multi-layer structure of three or more layers) consisting of a pair of crepe papers 1 as outer layers and one or more sheets of nonwoven fabric 2 arranged in a stacked state between the pair of crepe papers 1, and is characterized in that the printed portion is provided on the inner surface (i.e., the inner surface of the laminated paper 10) of the nonwoven fabric 2 facing one of the crepe papers 1 as the outer layer sheet, and the crepe paper 1 is bonded to the nonwoven fabric 2 by heat fusion and pressure bonding using the heat fusion portion 1.

[0030] [Printed area on nonwoven fabric] For example, as shown in Figure 5, the printed portion comprises a printed layer 2a provided on one surface (one side in the thickness direction) of a nonwoven fabric 2 serving as an intermediate layer sheet. That is, the nonwoven fabric 2 of the laminated paper 10 is configured as an intermediate layer sheet made of a material that can be printed with the printed portion, and the printed portion is formed by printing a desired pattern portion 13 or advertisement portion 14 on one surface of the nonwoven fabric 2 using a predetermined printing ink. Note that in Figure 5, for the sake of convenience, the printed layer 2a is depicted as a thin layer on one surface of the nonwoven fabric 2. However, in reality, the printing ink that constitutes the printed layer 2a penetrates into the nonwoven fabric 2 from one surface during printing to form the predetermined pattern, etc. of the printed portion. Therefore, there are cases where the printing ink completely penetrates into the nonwoven fabric 2 and no layer of printing ink is formed on one surface of the nonwoven fabric 2, or there are cases where some of the printing ink penetrates into the nonwoven fabric 2 while the remaining printing ink forms a layer on one surface of the nonwoven fabric 2. In addition, after the printing ink has completely penetrated into the nonwoven fabric 2, it may be exposed from the other side of the nonwoven fabric 2, and a layer of printing ink may also be formed on the other side of the nonwoven fabric 2. In either case, the printed portion of the laminated paper 10 is drawn with the highest density on the one side of the nonwoven fabric 2 that will be the printing surface, and is visible as the printed layer 2a. In other words, the pattern portion 13 and advertising portion 14 of the various types of laminated paper 10 described above are formed by printing on one side of the nonwoven fabric 2 using any printing ink and any printing method in accordance with the pattern configuration, advertising content, etc.

[0031] [Printing layer composition (printing ink and printing method)] Here, the printed layer 2a of the printed portion of the laminated paper 10 is formed on one side of the nonwoven fabric 2 by any printing method using any printing ink. Preferably, the printed portion is formed using flexographic printing technology and aqueous ink or UV (ultraviolet-curable) ink. Specifically, flexographic printing is a type of direct-transfer relief printing that uses rubber or synthetic resin as the plate material and liquid ink such as aqueous ink or UV ink. The printed layer 2a of the printed portion of the laminated paper 10 is formed by printing a predetermined pattern portion 13 or advertising portion 14 on one side of the nonwoven fabric 2 with the aqueous ink or UV ink of adjusted concentration. The laminated paper 10 is formed by sandwiching the nonwoven fabric 2 with this printed portion between a pair of crepe papers 1 and integrating them by heat-sealing them together using a row of heat-sealed portions 11. Even when the printed portion of this laminated paper 10 is a nonwoven fabric 2 with a finely textured surface, the desired pattern 13 or advertisement 14 can be clearly printed as the printed portion using a flexographic printing plate with the elasticity and shape-following properties of flexographic printing. As a result, in laminated paper 10 manufactured using nonwoven fabric 2 with printed portions, the printed portion is visible from the outside through the crepe paper 1 with good print quality, especially when wet. Furthermore, since the printing ink used for the printed portion of nonwoven fabric 2 in this laminated paper 10 is water-based ink or UV ink, the printing ink does not contain organic solvents. As a result, laminated paper 10 manufactured using nonwoven fabric 2 with printed portions is not affected by the volatilization of organic solvents, as is the case with printing inks that use organic solvents. This makes it a user- and environmentally-friendly product, especially when used for sanitary products such as paper towels. Printing of laminated paper 10 onto nonwoven fabric 2 is performed using a flexographic printing machine capable of printing up to seven colors, with the density of each printing ink adjusted.

[0032] [Nonwoven fabric material] On the other hand, in the laminated paper 10 according to embodiment 1 shown in Figure 5, the nonwoven fabric 2 serving as the middle layer sheet is made of a material that can be printed with the printed portion, and the crepe paper serving as the outer layer sheet is made of a nonwoven fabric of a material that can be reliably heat-sealed and bonded at the linear heat-sealing portion. This makes it possible to provide a pattern portion 13 or an advertising portion 14 by printing on one side of the nonwoven fabric 2 that will be placed on one side of the laminated paper 10 (typically, when the laminated paper 10 is used in a paper towel, this is the side of the laminated paper that is exposed on the outer surface of the paper towel, i.e., the front side of the paper towel), and by favorably bonding the crepe paper 1 that forms a pair of outer layers to both sides of the nonwoven fabric 2, it is possible to form laminated paper 10 with a multi-layer structure (a three-layer structure in the case of Figure 5).

[0033] [Thickness of nonwoven fabric] Furthermore, in the laminated paper 10, as described above, the nonwoven fabric 2 serving as the intermediate layer sheet must be made of a material that has both the printability to allow printing of the printed portion and the heat-sealability to allow heat-sealing of the crepe paper. In order to combine the printability and heat-sealability properties, it is preferable to use a nonwoven fabric having a thickness of any value within a predetermined range. Specifically, for example, conventional nonwoven paper towels use a sheet-shaped nonwoven fabric with a basis weight of 45 to 70 g / cm2 as the raw material sheet. On the other hand, the laminated paper 10 of the present embodiment uses a pair of crepe paper 1 and nonwoven fabric 2 as the raw material sheets, and also uses a nonwoven fabric 2 with a basis weight of 15 to 25 g / m2. 2 It is preferable to use a nonwoven fabric having a thickness within the range of 18 to 22 g / m 2 It is more preferable that the thickness is within the range of 18 to 20 g / m 2 and a basis weight of 20 g / m 2 That is, in the laminated paper 10, the thickness of the nonwoven fabric 2 is most preferably 25 g / m 2 If the thickness of the nonwoven fabric 2 is greater than 25 g / m², the laminated paper 10 may lack flexibility, and for example, when the laminated paper 10 is used for paper towels or the like, the laminated paper 10 may feel stiff to the touch. 2If it is larger than this, the strength will be higher than necessary, which will cause unnecessary cost increases. Furthermore, during the manufacturing process of the laminated paper 10, for example, in the process of heat-sealing the crepe paper 1 to the nonwoven fabric 2 using a pair of heat-seal rollers, when heat is transferred from the heat-seal roller having a heat source to the nonwoven fabric 2 via one of the crepe papers 1, the efficiency of heat transfer decreases as the thickness of the nonwoven fabric 2 increases. Therefore, even if heat-sealing between one of the crepe papers 1 and one side of the nonwoven fabric 2 is performed well, heat-sealing between the other crepe paper 1 and the other side of the nonwoven fabric may not be performed sufficiently, and the adhesive strength of the nonwoven fabric 2 to the other crepe paper 1 may be insufficient. On the other hand, when the thickness of the nonwoven fabric 2 is 15 g / m2 or less, 2 If it is smaller than this, the amount of thermoplastic resin contained in the nonwoven fabric 2, which is the material for expressing the thermal adhesive strength, will be relatively reduced, and there is a possibility that sufficient thermal adhesive strength will not be obtained when thermally adhesively bonding the crepe paper 1 to both sides of the nonwoven fabric 2. In addition, the overall stiffness of the laminated paper 10 will be weakened, which may have an adverse effect on the user's experience of using the laminated paper 10, for example, when the laminated paper 10 is used for paper towels, etc.

[0034] [Nonwoven fabric raw fiber] Furthermore, when the thickness of the nonwoven fabric 2 is set to a value within the above-mentioned predetermined range in order to provide both the printability and the heat-sealing property, and particularly when the thickness is set to a value on the lower limit side of the above-mentioned predetermined range (for example, when the thickness is set to a basis weight of 15 g / m 2 , basis weight 18g / m 2(when the thickness of the nonwoven fabric 2 is set to a value on the lower limit side of the above-mentioned range), it is preferable to use a nonwoven fabric made of sheath-core composite fibers. That is, when the thickness of the nonwoven fabric 2 is relatively small (i.e., when the thickness is on the lower limit side of the above-mentioned specified range), a nonwoven fabric with such a relatively small thickness is likely to weaken the overall stiffness of the laminated paper 10. However, by using a nonwoven fabric made of sheath-core composite fibers, when the crepe paper 1 is heat-sealed to the nonwoven fabric 2, the sheath portion of the sheath-core composite fibers softens or melts at a specified heating temperature, thereby exerting adhesive strength to the crepe paper 1 through heat fusion, while the core portion of the sheath-core composite fibers remains intact without softening or melting, maintaining the strength and stiffness of the nonwoven fabric 2 itself. As a result, the strength and stiffness of the entire laminated paper 10 can be maintained, and the volume of the laminated paper 10 can be maintained even with a thin nonwoven fabric 2.

[0035] [Crepe paper thickness] In the laminated paper 10, the crepe paper 1 has a thickness within a predetermined range to achieve a predetermined transmittance (degree of transparency). Specifically, one piece of crepe paper 1, which is overlaid and bonded to one side of the nonwoven fabric 2 (i.e., the side on which the printed portion is provided), has a thickness set so that when the laminated paper 10 is dry, at least a portion of the printed portion of the nonwoven fabric 2 is visible through the crepe paper 1 (or at least a portion of the printed portion of the nonwoven fabric 2 is visible in a semi-transparent state), and at least when the laminated paper 10 is wet due to water absorption, the entire printed portion of the nonwoven fabric 2 is clearly visible through the crepe paper 1 (or at least a portion of the printed portion of the nonwoven fabric 2 is visible in a substantially transparent state). On the other hand, the other piece of crepe paper 1, which is overlaid and bonded to the other side of the nonwoven fabric 2, is usually set to the same thickness as the one piece of crepe paper 1, but can also be set to a different thickness. Even if the other crepe paper 1 is made the same thickness as one of the crepe papers 1, if the thickness of the nonwoven fabric 2 is within the above-mentioned specified range, when the laminated paper 10 is in a dry state, at least a portion of the printed portion of the nonwoven fabric 2 will still be visible through the other crepe paper 1 (although less clearly than on the side of one of the crepe papers 1), and when the laminated paper 10 is in a wet state due to its water content, the entire printed portion of the nonwoven fabric 2 will be visible through the other crepe paper 1 with a certain degree of clarity (although less clearly than on the side of one of the crepe papers 1). In any case, in the laminated paper 10, the crepe paper 1 is set to a thickness of any value within a specified range to achieve a specified light transmittance (synonymous with light transmittance, hereinafter simply referred to as "transmittance").This results in a unique effect in which, when the laminated paper 10 is in a dry state, at least a portion of the printed portion of the nonwoven fabric 2 is visible through the crepe paper 1, whether viewed from one side of the crepe paper 1 or the other side of the crepe paper, and when the laminated paper 10 is in a wet state due to its water content, the entire printed portion of the nonwoven fabric 2 is visible, to varying degrees, clearly through the crepe paper 1.

[0036] Specifically, in the laminated paper 10, the thickness of the crepe paper 1 is 20 to 50 g / m 2 and more preferably, 20 to 40 g / m 2and more preferably, 30 to 40 g / m 2 and more preferably, 30 to 35 g / m 2 and more preferably, 30 to 33 g / m 2 Any value within the range of 33 to 35 g / m 2 and most preferably about 33 g / m 2 or approximately 35 g / m 2 For example, the thickness of crepe paper 1 is set to a value of 35 g / m 2 , 27g / m 2 , or 23 g / m 2 The inventors have conducted extensive research into the relationship between the crepe wrinkles of the crepe paper 1 and the thickness of the crepe paper 1, and have found that if the thickness of the crepe paper 1 is outside the above range, the desired physical properties required of the crepe paper 1 of the laminated paper 10 cannot be ensured. 2 In the following, we have found that when manufacturing crepe paper 1 using a crepe paper manufacturing device, if the feed speed of the raw material sheet (paper sheet in an uncreped state) of the crepe paper 1 is increased, it is not possible to form a crepe on the raw material sheet. On the other hand, when the thickness of the crepe paper 1 is 50 g / m2 in basis weight, 2 If this temperature exceeds 100°C, when the crepe paper 1 is laminated on the nonwoven fabric 2 and heat-sealed to the nonwoven fabric 2 in the heat-sealing section 11 to form the laminated paper 10, the heat from the pressing surface of the heat-sealing roller will be blocked by the thick crepe paper 1 and will not fully reach the nonwoven fabric 2, and the thermoplastic resin used as the adhesive for the nonwoven fabric 2 will not melt sufficiently, and the desired adhesive strength to the crepe paper 1 will not be exhibited, which may make it impossible to adhere the crepe paper 1 to the nonwoven fabric 2.

[0037] In addition, the thickness of crepe paper 1 is 40 g / m 2 If the thickness exceeds 40 g / m, the feed speed of the raw material sheet must be extremely slowed down during production by the crepe paper production device, which may result in a decrease in production efficiency. From this point of view, the upper limit of the thickness of the crepe paper 1 is set to 40 g / m.2 It is preferable that the thickness of the crepe paper 1 is 35 g / m 2 If the thickness exceeds 35 g / m, even if the feed rate of the raw material sheet is slowed down during production by the crepe paper production device, the production of the crepe paper itself may become difficult depending on the performance of the crepe paper production device. From this point of view, the upper limit of the thickness of the crepe paper 1 is set to 35 g / m. 2 It is preferable to set the following.

[0038] [Total thickness of laminated paper (total thickness of crepe paper and nonwoven fabric)] As described above, the crepe paper 1 and nonwoven fabric 2, which are components of the laminated paper 10, are each configured to have a thickness of any value within a predetermined range, and the overall thickness of the laminated paper 10 is determined by the thickness of the crepe paper 1 and the thickness of the nonwoven fabric 2. Preferably, the overall thickness of the laminated paper 10 is determined by the thickness of each crepe paper 1 being 35 g / m2 in basis weight. 2 The thickness of the nonwoven fabric 2 is 20 g / m 2 By doing so, the total thickness is (35 + 20 + 35 =) 90 g / m 2 It is most preferable to set the thickness of the crepe paper 1 to this value (35 g / m 2 ) and the thickness of the nonwoven fabric 2 is set to this value (20 g / m 2 ), and the total thickness of the laminated paper 10 is set to this value (90 g / m 2 ), when the raw material sheet of the laminated paper 10 (i.e., a raw material sheet consisting of a pair of crepe paper raw material sheets with one nonwoven fabric raw material sheet sandwiched between them) is cut at a predetermined feeding position during the production of the laminated paper 10 (i.e., when the raw material sheet of the laminated paper 10 is cut to a predetermined length depending on the intended use), cutting can be performed most efficiently, thereby improving production efficiency and yield.

[0039] [Effect of laminated paper with printed area] In this way, laminated paper 10 with printed portions can achieve a unique design effect because printed portions such as pattern portion 13 and advertisement portion 14 have an appearance and feel as if they are half-raised through crepe paper 1. Specifically, when laminated paper 10 is in a dry state, the transmittance (transparency) of the dried crepe paper 1 is relatively low, so the patterns and advertisements in the printed portions are indistinct through the crepe paper 1 but are still visible to some extent. However, when laminated paper 10 is in a wet state due to water absorption, the transmittance (transparency) of the wet crepe paper 1 becomes relatively high, so the patterns and advertisements in the printed portions are clearly visible through the crepe paper 1 and, due to the presence of the crepe paper 1, the unique effect of appearing as if they are raised from laminated paper 10 is achieved.

[0040] [Effect of printed area on nonwoven fabric] Furthermore, as described above, the laminated paper 10 can be configured as described above, and thus can have a printed portion on which a pattern portion 13 or an advertisement portion 14, which has not been conventionally printed, is provided. Therefore, compared to, for example, conventional colored paper towels (paper towels colored entirely in a single color), which are made by simply coloring the raw fiber (e.g., pulp) of the raw material sheet for the towel, the laminated paper 10, with its printed pattern portion 13 or advertisement portion 14, is a product with a highly design-rich appearance. Furthermore, because the laminated paper 10 is formed by sandwiching the nonwoven fabric 2 with a printed portion between a pair of crepe papers 1, the pattern or advertisement of the printed portion gives the viewer a soft impression when viewed from the outside, achieving a unique visual effect. In particular, when the laminated paper 10 is applied to sanitary paper products such as paper towels, which is its primary use, the laminated paper 10 as a sanitary paper product is typically provided to the user after being moistened with water, and the user uses the moist laminated paper 10 to wipe away dirt from their hands or other parts of their body. In this case, it is necessary to prevent the printing ink in the printed portion of the laminated paper 10 from dissolving in water and leaching out of the crepe paper 1, resulting in contact with the user's hands or body. However, conventional colored paper towels are colored entirely with a single color of printing ink, which means that the printing ink is exposed on the surface of the colored paper towel. Therefore, conventional colored paper towels must use organic solvent-type printing ink so that the printing ink exposed on the surface does not dissolve and come into contact with the user's hands or skin when wet due to water content, and as mentioned above, the effects of volatile components of organic solvents cannot be ruled out.

[0041] In contrast, in the laminate paper 10 of the present embodiment, as described above, the printed area is formed on the nonwoven fabric 2 using aqueous ink or UV ink by flexographic printing, and both sides of the nonwoven fabric 2 are completely covered with crepe paper 1. Therefore, the printing ink in the printed area is never directly exposed on the surface of the laminate paper 10 and remains shielded by the crepe paper 1. Therefore, despite the printed area, the laminate paper 10 is configured so that the printing ink does not come into direct contact with the user's hands or skin even when used in a wet state when it is hydrated. This allows the laminate paper 10 to be provided as a safe and harmless laminate paper for users, as well as an environmentally friendly laminate paper. This also has the advantage of eliminating the need for organic solvent-based printing inks, as is the case with conventional colored paper towels. The aqueous ink used for the printing area of ​​the laminate paper 10 is preferably a pigment-based aqueous ink, which effectively prevents the printing ink in the printed area of ​​the nonwoven fabric 2 from easily dissolving and leaching out when the laminate paper 10 is wet when it is hydrated.

[0042] [Manufacturing method for laminated paper with printed section (width dimension of nonwoven fabric raw material sheet)] Next, a method for manufacturing the laminated paper 10 having a printed portion will be described. Generally, nonwoven fabrics are manufactured by producing a web (also called fleece) from predetermined raw fiber materials consisting of natural fibers (pulp) or synthetic fibers using a predetermined web-forming method such as a dry method, a wet method, or a spunbonding method, and then bonding the fibers of the web using a predetermined bonding method such as a chemical bonding method, a thermal bonding method, a needle punching method, or a hydroentanglement method. While it is preferable to use a nonwoven fabric made of the core-sheath composite fiber as the nonwoven fabric 2 in the laminated paper 10 of this embodiment, it is even more preferable to use a nonwoven fabric manufactured by bonding the fibers using an air-through method, which is a type of thermal bonding method (hereinafter, for convenience of explanation, referred to as an "air-through nonwoven fabric") as the nonwoven fabric 2. This air-through nonwoven fabric has advantages such as excellent extensibility and flexibility, providing a soft feel to the user and a pleasant texture. Furthermore, even after heat-sealing crepe paper 1 to form nonwoven fabric 2, the crepe paper 1 exhibits good adhesive strength. In producing laminated paper 10, a pair of raw material sheets for crepe paper 1 (hereinafter referred to as "crepe paper raw material sheets") is sandwiched between a pair of raw material sheets for nonwoven fabric 2 (hereinafter referred to as "nonwoven fabric raw material sheets") to form a three-layer (three-ply) raw material sheet (hereinafter referred to as "laminate raw material sheet"). The laminated raw material sheet is then fed, for example, between a pair of heat-sealing rollers, and the pair of crepe paper raw material sheets are heat-sealed to the respective nonwoven fabric raw material sheets by the pair of heat-sealing rollers to form the final laminated paper. In this case, the crepe paper raw material sheet and the nonwoven fabric raw material sheet usually have the same width (for example, 1200 mm). In particular, if the width dimension of the nonwoven fabric raw material sheet is smaller than the width dimension of the crepe paper raw material sheet, there will be portions at the width direction end of the laminated raw material sheet where the crepe paper raw material sheet cannot be heat-sealed to the nonwoven fabric raw material sheet, so it is not preferable for the width dimension of the nonwoven fabric raw material sheet to be smaller than the width dimension of the crepe paper raw material sheet.

[0043] [Setting the width direction dimension of the nonwoven fabric raw material sheet according to the nonwoven fabric material] On the other hand, when providing a printed portion on the nonwoven fabric 2 as described above, the nonwoven fabric raw material sheet is fed into a predetermined printing device in advance to print the predetermined printed portion on the raw material sheet. However, the present inventors have found that when the air-through nonwoven fabric is used as the nonwoven fabric, the nonwoven fabric raw material sheet shrinks due to the heat generated during printing, presumably due to its high elasticity. Consequently, the inventors have conducted extensive research into an invention for a laminated paper that takes this effect into consideration and have come up with the following configuration. Specifically, the present inventors have found that when a printed portion is formed on the laminated paper 10, for example, when the printed portion is formed using flexographic printing, if the printed portion is printed on a nonwoven fabric raw material sheet 2 having a width of 1200 mm, the width of the nonwoven fabric raw material sheet will shrink from 1200 mm to 1150 mm after printing (i.e., to about 96% of its original width), or that under other conditions the width of the nonwoven fabric raw material sheet will shrink from 1300 mm to 1200 mm (i.e., to about 92% of its original width). The inventors have attempted to print on the nonwoven fabric raw material sheet in a state in which it is stretched in the width direction (by the amount of shrinkage), taking into consideration the shrinkage of the nonwoven fabric raw material sheet during printing, but have found that in this case it becomes difficult to perform the desired printing on the nonwoven fabric raw material sheet. Therefore, in the method for manufacturing laminated paper 10 having a printing section, a nonwoven fabric raw material sheet having a width that is a predetermined percentage larger than the width of laminated paper 10 that is actually to be obtained, depending on the shrinkage rate, is used as the nonwoven fabric raw material sheet, in order to compensate for the shrinkage of the nonwoven fabric raw material sheet during printing (i.e., the width dimension of the nonwoven fabric raw material sheet is set to a width that compensates for the shrinkage dimension depending on the shrinkage rate).

[0044] The inventors have experimentally confirmed that, for example, when a 1200 mm wide nonwoven fabric raw material sheet is used and the printing portion is printed on this nonwoven fabric raw material sheet, the nonwoven fabric raw material sheet shrinks after printing to a width of 1150 mm (i.e., 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 laminated paper in this embodiment, a nonwoven fabric is used as base paper that is approximately 4% (approximately 4.12%) larger than the required dimension after shrinkage. For example, if the width of the raw material sheet for laminated paper is 1200 mm, the width of the crepe paper raw material sheet is the same 1200 mm, but the width of the nonwoven fabric raw material sheet is approximately 4% larger than 1200 mm (for example, 1250 mm).

[0045] [Effects specific to the width dimension setting of nonwoven fabric raw material sheets] According to the method for manufacturing laminated paper using nonwoven fabric raw material sheets whose width direction dimension is set as described above (i.e., whose width direction dimension is set so as to compensate for the shrinkage rate of the nonwoven fabric raw material sheets during printing), the width of the nonwoven fabric raw material sheets becomes the same as the predetermined width of the laminated paper raw material sheets (i.e., the predetermined width of the crepe paper raw material sheets) after the printing process in the printing unit. For example, if the predetermined width of the laminated paper raw material sheets (i.e., the predetermined width of the crepe paper raw material sheets) is 1200 mm, the width of the nonwoven fabric raw material sheets will also be the same width, about 1200 mm (i.e., 50 mm smaller than the width before printing, or about 4% smaller than the width before printing). Therefore, a three-layer laminated paper raw material sheet is formed by stacking this printed nonwoven fabric raw material sheet (approximately 1200 mm wide) between a pair of crepe paper raw material sheets (1200 mm wide).The crepe paper raw material sheets as the pair of outer layers and the nonwoven fabric raw material sheet as the middle layer all have the same width, and can be smoothly supplied to the laminated paper manufacturing process as a 1200 mm wide laminated paper raw material sheet.The manufactured laminated paper 10 will also have the desired width of 1200 mm.

[0046] Embodiment 2 (Laminated paper with a printed portion provided on crepe paper) [Overall structure of laminated paper and structure of crepe paper] As shown in Figure 5, in the example of the first embodiment, the laminated paper 10 has a three-layer structure (a structure of three overlapping sheets) consisting of a pair of crepe papers 1 and one sheet of nonwoven fabric 2, and is configured so that a printed layer 2a of the printed portion is provided on the surface of the nonwoven fabric 2 serving as an intermediate layer sheet. However, as shown in Figure 6, in the three-layer laminated paper 10 of the second embodiment, a printed layer 1a of the printed portion is provided on the inner surface of the crepe paper 1 serving as an outer layer sheet. That is, in the second embodiment, the laminated paper 10 has a multi-layer structure (a multi-layer structure of three or more layers) consisting of a pair of crepe papers 1 serving as outer layer sheets and one or more sheets of nonwoven fabric 2 serving as intermediate layer sheets arranged in a stacked state between the pair of crepe papers 1, and is characterized in that the printed portion is provided on the inner surface of one of the crepe papers 1 serving as an outer layer sheet as its internal surface (i.e., as the internal surface of the laminated paper 10), and the crepe paper 1 is bonded to the nonwoven fabric 2 by heat fusion and pressure bonding using the heat fusion unit 1. The inner surface of the crepe paper 1 refers to the surface that is on the inside of the laminated structure of the laminated paper 10 (i.e., the side facing the nonwoven fabric 2) when one (or two or more) sheets of nonwoven fabric 2 are sandwiched between a pair of crepe papers 1 as outer layer sheets to form the laminated paper 10. Here, the crepe paper 1 has two surfaces, one of which is highly smooth (i.e., a relatively smooth surface that feels good to the touch) and the other of which is a back surface that is less smooth (i.e., a relatively rough surface that feels rough to the touch). However, in the laminated paper 10 of the second embodiment, it is preferable to form the above-mentioned laminated structure with the surface side of the crepe paper 1 as the inner surface.

[0047] [Unique effect of printing on the inside (surface) of crepe paper] The inventors have experimentally confirmed that the laminated paper 10 of the second embodiment, when a nonwoven fabric 2 is interposed between a pair of crepe papers 1 and the crepe paper 1 is thermally fused to the nonwoven fabric 2 by the thermal fusion unit 1, the crepe paper 1 is more reliably and firmly bonded to the nonwoven fabric 2. In addition, when a printed layer 1a of a printed section is provided on the inner surface of the crepe paper 1 as in the second embodiment, the inner surface of the crepe paper 1 on which the printed layer 1a is provided (i.e., on which printing ink is printed) has a high smoothness, allowing the desired pattern 13 or advertisement 14 to be printed in a more favorable condition, thereby further improving print quality. Furthermore, in the second embodiment, the printed section is provided on the inner surface of the crepe paper 1, and therefore the printed section does not come into contact with the user's fingers or skin. This eliminates user anxiety about direct contact with printing ink and reliably prevents health problems caused by printing ink. Furthermore, when providing a printed portion on the laminated paper 10, it is preferable in terms of print quality to provide the printed portion on the nonwoven fabric 2, which is the middle layer (i.e., inner layer) of the laminated paper 10, as in embodiment 1, rather than providing the printed portion on the crepe paper 1, which is the outer layer of the laminated paper 10, as in embodiment 2.

[0048] [Thickness of crepe paper, nonwoven fabric, and laminated paper] In the case of the laminated paper 10 of the second embodiment, the thickness of the crepe paper 1, the thickness of the nonwoven fabric 2, and the overall thickness of the laminated paper 10 can be set in the same manner as in the first embodiment.

[0049] Embodiment 3 (Laminated paper having a colored portion provided on an intermediate layer sheet) [Overall structure of laminated paper and structure of non-permeable sheet as intermediate layer sheet] As shown in Figure 5, in the example of embodiment 1, the laminated paper 10 has a three-layer structure and is configured with a printed portion on the surface of the nonwoven fabric 2 serving as the middle layer sheet; as shown in Figure 6, in embodiment 2, the laminated paper 10 has a three-layer structure and is configured with a printed portion on the inner surface of the crepe paper 1 serving as the outer layer sheet; but in embodiment 3, as shown in Figure 7, the three-layer laminated paper 10 of embodiment 3 has an intermediate layer sheet made of an impermeable sheet 5 made of synthetic resin film (e.g., an impermeable sheet or a waterproof sheet), and a printed layer 5a of the printed portion is provided on the surface of this impermeable sheet 5. That is, in the third embodiment, the laminated paper 10 has a multi-layer structure (three-layer structure) consisting of a pair of crepe papers 1 as outer layer sheets and a single impermeable sheet 5 as an intermediate layer sheet laminated between the pair of crepe papers 1. The printed portion is provided on the surface of the impermeable sheet 5 as its inner surface (i.e., the inner surface of the laminated paper 10), and the crepe paper 1 is bonded to the impermeable sheet 5 by heat fusion and pressure bonding using the heat fusion unit 1. Suitable examples of the impermeable sheet 5 include those commonly called vinyl sheets or vinyl films, as well as resin films or sheets made of polyvinyl chloride resins and polyolefin resins (such as polyethylene resins and polypropylene resins). The thickness of the impermeable sheet 5 is preferably within a range of 0.1 mm to 0.2 mm. The water-impermeable sheet serving as the impermeable sheet 5 has the primary function of blocking the permeation of water, but the impermeable sheet may also be configured with an impermeable sheet that blocks the permeation of oil (hereinafter referred to as an "oil-impermeable sheet"). Furthermore, in the present application, the term "impermeable sheet" includes not only the water-impermeable sheet but also the oil-impermeable sheet, and also includes sheets that block the permeation of other liquids and some gases. In other words, in the present invention, the impermeable sheet may be a sheet or film made of synthetic resin that serves as the intermediate layer sheet and blocks the permeation of water and / or oil.

[0050] [Unique effect of non-transparent sheet] According to the laminated paper 10 of embodiment 3, the impermeable sheet 5, which includes an impermeable sheet or an oil-impermeable sheet as an intermediate layer sheet, blocks the penetration of moisture and oil, so that the laminated paper 10 can be used not only for typical products such as paper towels, but also as wrapping paper for temporarily or long-term packaging of objects or goods that have moisture or oil attached, thereby greatly expanding the uses of the laminated paper 10.

[0051] [Scope of the invention of laminated paper according to embodiments 1 to 3] The laminated paper 10 of the first to third embodiments is primarily characterized by a printed section provided on the inner surface of the laminated paper 10 (the inner surface of the middle layer sheet or outer layer sheet). In other words, the laminated paper 10 of the first to third embodiments can have a different configuration from the above-described embodiments in terms of the components other than the printed section (such as the thermally fused section) as long as it has such a printed section. In other words, the laminated paper 10 has a multi-layer structure consisting of an outer layer sheet and a middle layer sheet, and as long as it has the printed section on its inner surface, the thermally fused section and other elements or parts can have any configuration. For example, in the laminated paper provided with the printed portion of the present invention, the row of heat-sealed portions may be in the form of a broken line as in the first embodiment, or may be in the form of a wavy line of another configuration, a dotted line, a chain line consisting of chain lines such as a dashed line or a two-dot chain line, or may be in the form of a zigzag or staggered line, or may be in the form of a straight line consisting of solid lines, or may be embodied in a laminated paper with scattered dot-shaped heat-sealed portions. However, in order to obtain a sufficient expansion effect throughout the laminated paper after it is hydrated and to create a sense of volume when in use, it is preferable that the row of heat-sealed portions be in the form of a straight broken line (or chain line) as in the above embodiment.

[0052] [Invention of laminated paper without a printing section] On the other hand, among the configurations of the laminated paper 10 described in the first embodiment above, the following configurations alone are novel and involve an inventive step over the prior art. That is, in addition to the laminated paper invention having a printed portion as described above (hereinafter referred to as the "first laminated paper invention"), the laminated paper invention in which the thickness of the nonwoven fabric is within the predetermined range and the thickness of the crepe paper is also within the predetermined range (hereinafter referred to as the "second laminated paper invention"), and the laminated paper invention in which the spacing between the heat-sealed portions in the width direction is within the predetermined range depending on the crepe rate of the crepe paper (hereinafter referred to as the "third laminated paper invention") are novel and involve an inventive step over the prior art even in their own right (i.e., even if they do not have a printed portion).

[0053] [Second laminated paper invention (thickness range of crepe paper and thickness range of nonwoven fabric)] Specifically, the second laminated paper invention comprises a pair of crepe papers as outer layer sheets and a heat-sealable intermediate layer sheet disposed in a laminated state between the crepe papers, and the crepe paper is heat-sealed to the intermediate layer sheet by a linear heat-sealed row extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend to form a laminated structure, and further, the crepe paper has a density of 20 to 50 g / m 2 and the nonwoven fabric has a basis weight of 15 to 25 g / m 2 The thickness of the film is in the range of 1000 to 15000 mm.

[0054] [Third invention of laminated paper (crepe rate of crepe paper and widthwise heat-sealed interval)] Furthermore, the third laminated paper invention comprises a pair of crepe papers as outer layer sheets and a heat-sealable intermediate layer sheet arranged in a laminated state between the crepe papers, and the crepe paper is heat-sealed to the intermediate layer sheet by a linear row of heat-sealed portions extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend to form a laminated structure, and further, the widthwise heat-sealed portion spacing, which is the spacing between the widthwise center lines of adjacent rows of heat-sealed portions, is set to any value within a predetermined range depending on the crepe rate of the crepe paper, and when the crepe rate of the crepe paper is within the range of 20% to 26%, the widthwise heat-sealed portion spacing is set within the range of 10 mm to 15 mm, and when the crepe rate of the crepe paper is within the range of 26% to 30%, the widthwise heat-sealed portion spacing is set within the range of 15 mm to 25 mm.

[0055] Embodiment 4 (Laminated paper having improved nonwoven fabric in the intermediate layer sheet) [Nonwoven fabric composition] The laminated paper of the present invention can be embodied as follows, featuring a nonwoven fabric structure as an intermediate layer sheet. Specifically, in the laminated paper of embodiment 4, the nonwoven fabric is made of a nonwoven fabric with a high degree of stretch, specifically, a nonwoven fabric manufactured using so-called core-sheath structure fibers, as described below. That is, conventional nonwoven fabrics are made of so-called pulp nonwoven fabrics, and are manufactured by accumulating fibrous materials obtained by pulverizing wood pulp into a web-like form and bonding them together to form a sheet-like portion. Furthermore, conventional paper towels are generally made from nonwoven fabric, and the nonwoven fabric used is formed into a sheet with a basis weight of 45 to 70 g / cm2.

[0056] [Types of nonwoven fabrics of the present invention (types by manufacturing method)] In contrast, referring to the cross-sectional view of Figure 5, for example, the laminated paper 10 of the fourth embodiment can use an air-through type (thermal bonded) nonwoven fabric containing air as the intermediate layer sheet. This allows the laminated paper 10 to have a thick overall structure while being highly stretchable, with a pleasant feel and thermal fusion properties. Furthermore, the nonwoven fabric of the laminated paper of the fourth embodiment is made from a nonwoven fabric made from so-called sheath-core composite fibers. These sheath-core composite fibers are short synthetic fibers (such as PE / PP or PE / PET composite fibers) that are used as the raw fibers for the nonwoven web (a layer of fibers sometimes called fleece) manufactured by a dry process or the like. The fibers are bonded together using the air-through method of thermal bonding (i.e., by passing hot air through the web in the thickness direction from the front to the back, melting the resin in the sheath of the composite fiber and bonding the fibers together). This sheath-core fiber has an outer sheath made of PE (polyethylene) and an inner (central) core made of PET (polyethylene terephthalate). This nonwoven fabric has a soft texture because no adhesive is used to bond the fibers together, but it is not water-absorbent. Therefore, when a printed section is provided on the nonwoven fabric 2, as in the laminated paper 10 of embodiments 1 to 3, the nonwoven fabric 2 does not absorb moisture and supply water to the printing ink on the surface printed layer 2a when the laminated paper 10 absorbs water. Therefore, this laminated paper 10 exhibits an additional unique effect of maintaining good print quality on the printed section of the nonwoven fabric 2. Furthermore, the PE in the sheath softens at low temperatures, allowing the heat-sealed section 11 of the laminated paper 10 to effectively bond the crepe paper 1, while the PET in the core maintains the strength of the fiber itself, thereby maintaining the overall strength of the nonwoven fabric. In other words, the sheath of this nonwoven fabric's sheath-core structure exerts adhesive strength and functions as an adhesive for the crepe paper, while the core contributes to maintaining strength.

[0057] The core-sheath fiber material for this nonwoven fabric can be polyethylene (PE) with a melting point of approximately 120°C (i.e., low-density PE with a melting point of 95-130°C or 114-126°C, or high-density PE with a melting point of 120-140°C or 126-137°C). While low-density PE is typically used, PE with a density that results in a melting point of approximately 120°C can also be used. Polypropylene (PP) with a melting point of approximately 140°C (i.e., low-melting-point PP) can also be used. There are three types of PP: random copolymer PP, block copolymer PP, and homopolymer PP. Homopolymer PP has a melting point of 160-165°C, while block PP has a synthetic melting point of 140-150°C (or 160-165°C). Therefore, block PP with a lower melting point is used. The random PP with the lowest melting point can be one with a melting point of about 135 to 145° C. or 135 to 150° C. In this embodiment, random PP can be used as the raw fiber PP for the nonwoven fabric, and in this case, the melting point of the random PP is a low 125° C.

[0058] [Nonwoven fabric types (by melting point)] In the laminated paper of the present invention, even if any nonwoven fabric is used as the intermediate layer sheet, there are some nonwoven fabrics to which the crepe paper does not adhere well due to their melting points. Therefore, the nonwoven fabric 2 of the laminated paper 10 should have a melting point such that the crepe paper 1 is reliably bonded to the nonwoven fabric 2 by the heat-fusible components of the nonwoven fabric 2 (e.g., PE in the sheath portion of a core-sheath fiber) at the predetermined heating temperature during heat fusion by the heat-fusible section row 11 in the laminated paper manufacturing device. In particular, since the laminated paper of the present invention, including the laminated paper 10 of embodiments 1 to 3, is structured so that a pair of crepe papers is bonded to the nonwoven fabric by the adhesive force of the linear heat-fusible section row alone, the type of nonwoven fabric is selected so that sufficient bonding strength can be obtained between the crepe paper and the nonwoven fabric with such a small adhesive area. Such a nonwoven fabric can be manufactured using a core-sheath composite fiber, a polyester-based composite fiber, that is, a heat-fusible fiber for nonwoven fabric. For example, the nonwoven fabric used in this case may be one made from sheath-core conjugate fibers having a fineness of 2.2 dtex, a cut length of 5 mm or 10 mm, and a sheath component softening point of approximately 110° C., or one made from sheath-core conjugate fibers having a fineness of 1.7 dtex, a cut length of 5 mm, and a sheath component softening point of approximately 110° C., or one made from sheath-core conjugate fibers having a fineness of 2.2 dtex, a cut length of 5 mm, and a sheath component softening point of approximately 130° C. Alternatively, a nonwoven fabric may be used in which two or more of the above sheath-core conjugate fibers are appropriately mixed as raw fibers.

[0059] Embodiment 5 (Laminated Paper Manufacturing Apparatus) The laminated paper of the present invention, including the invention of the laminated paper 10 of the first to third embodiments, is preferably produced using a laminated paper production device described below.

[0060] [Manufacturing equipment configuration] 9, the laminated paper manufacturing apparatus of the fifth embodiment has three support rollers 51, 52, and 53 arranged side by side, each of which supports and rotatably supplies a roll of crepe paper 21, which will be the raw material sheet (crepe paper raw material sheet) for one of the pair of crepe papers, a roll of nonwoven fabric 22, which will be the raw material sheet (nonwoven fabric raw material sheet) for the nonwoven fabric, and a roll of crepe paper 23, which will be the raw material sheet (crepe paper raw material sheet) for the other of the pair of crepe papers. Furthermore, one crepe paper 1, one nonwoven fabric 2, and the other crepe paper 1, which are pulled out from one roll of crepe paper 21, one roll of nonwoven fabric 22, and the other roll of crepe paper 23, are stacked together (i.e., in a three-layer stack) to form a raw material sheet (laminate paper raw material sheet) for laminated paper 10. This laminated paper stock sheet is folded back by a first guide roller 61 and is guided and introduced between a first heat seal roller 70 as one pressure roller and a second heat seal roller 80 as the other pressure roller. The laminated paper stock sheet is folded back from the first guide roller 61 to the second heat seal roller 80, and is guided by a second guide roller 62 to be inserted between the first heat seal roller 70 and the second heat seal roller 80. Before being inserted between the first heat seal roller 70 and the second heat seal roller 80, the laminated paper stock sheet is a pre-heat-sealed laminated paper 10X in which the crepe paper 1 and the nonwoven fabric 2 are not heat-sealed.

[0061] Next, the stacked crepe paper 1 and nonwoven fabric 2 are heat-sealed between the first and second heat-seal rollers 70, 80, forming a laminated paper 10 having the heat-sealed portion 11. The laminated paper raw material sheet after this heat-sealing stage becomes a heat-sealed laminated paper 10Y 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) delivered from the first and second heat-seal rollers 70, 80 is then 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 a 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 placed 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 paper 10s of a predetermined width are arranged side by side and wound onto the winding roller.

[0062] [Heat seal roller] Next, the first and second heat-seal rollers 70, 80 will be described in detail with reference to Figures 10 to 13. Figure 10 shows the first and second heat-seal rollers 70, 80 of Figure 9 as viewed from above, with the first and second heat-seal rollers 70, 80 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).

[0063] [First heat seal roller] As shown in Figures 9 and 10, the first heat-sealing roller 70 is cylindrical with the predetermined roller diameter D, and its peripheral surface is provided with non-bonding portions 71 each having a ring-shaped groove shape of a constant width and thermo-compression-bonding protrusions 72 each having a dashed ring shape (or dashed stripe shape) of a constant width, arranged parallel to each other in the axial direction. As shown in Figure 11, each non-bonding portion 71 has a bonding surface 72a that extends intermittently as an arc-shaped surface in the circumferential direction along the peripheral surface of the first heat-sealing roller 70 and is flat in the width direction. Specifically, each thermo-compression-bonding protrusion 72 has a thermo-compression-bonding surface 72a (as the peripheral surface of the thermo-compression-bonding protrusion 72) that extends linearly in the circumferential direction for a predetermined length along the peripheral surface of the first heat-sealing roller 70 and is arranged continuously at regular intervals in the circumferential direction of the first heat-sealing roller 70. The thermocompression bonding surface 72a of the thermocompression bonding protrusion 72 is an arc-shaped surface (curved surface) in the length direction, and the length of the arc is set to be the same as the length of the first heat-sealed portion 11a or the second heat-sealed portion 11b in the heat-sealed portion row 11. The thermocompression bonding surface 72a of the thermocompression bonding protrusion 72 is flat in the width direction, and the width is set to be the same as the width of the first heat-sealed portion 11a or the second heat-sealed portion 11b in the heat-sealed portion row 11. Furthermore, the spacing between adjacent thermocompression bonding surfaces 72a of the thermocompression bonding protrusions 72 in each row is set to be the same dimension as the spacing between adjacent first heat-sealed portions 11a or second heat-sealed portions 11b in the heat-sealed portion row 11.

[0064] In this way, the first heat-seal roller 70 is configured to form broken-line convex ring-shaped thermo-compression protrusions 72 around its entire circumferential circumference, thereby forming one row of heat-sealed portions 11 on the laminated paper 10. The first heat-seal roller 70 also has multiple rows of thermo-compression protrusions 72 arranged continuously along its entire axial direction, parallel to one another and spaced at the same fixed intervals as the widthwise arrangement intervals of the multiple rows of heat-sealed portions 11 on the laminated paper 10. This results in the first heat-seal roller 70 having ring-shaped non-compression portions 71 between adjacent thermo-compression protrusions 72. The first heat-seal roller 70 also has multiple rows of non-compression portions 71 arranged continuously along its entire axial direction, parallel to one another and spaced at the same fixed intervals as the non-fused portions 12 on the laminated paper 10. Furthermore, on the first heat-seal roller 70, the heat-sealed surfaces 72a of adjacent rows of heat-sealed protrusions 72 are arranged so that their positions in the circumferential direction of the first heat-seal roller 70 are shifted from each other so that the longitudinal center position of the heat-sealed surface 72a of one heat-sealed protrusion 72 is located at the middle position of the gap between adjacent heat-sealed surfaces 72a of the other heat-sealed protrusion 72. As a result, as shown in Figures 11, 12, and 13, the heat-sealed protrusions 72 are composed of a first row of heat-sealed protrusions 72A corresponding to the first row of heat-sealed portion rows 11A of the laminated paper 10, and a second row of heat-sealed protrusions 72B corresponding to the second row of heat-sealed portion rows 11B. The first row of heat-sealed protrusions 72A have their heat-sealed surfaces 72a arranged in the circumferential direction of the first heat-seal roller 70 in correspondence with the first heat-sealed portions 11a of the first row of heat-sealed portion rows 11A, and the second row of heat-sealed protrusions 72B have their heat-sealed surfaces 72a arranged in the circumferential direction of the first heat-seal roller 70 in correspondence with the second heat-sealed portions 11b of the second row of heat-sealed portion rows 11B.

[0065] 10, the heat-sealing surface 72a of the heat-sealing protrusion 72 is made up of a straight narrow band portion 72x that extends linearly in a plan view (extending in a curved manner along the circumferential surface of the second heat-seal roller 70) and semicircular curved portions 72y at both longitudinal ends of the straight narrow band portion 72x. As a result, each of the heat-sealing portions 11a, 11b of the heat-sealing portion row 11 of the laminated paper 10 obtained by heat-sealing and heat-sealing the crepe paper raw material sheet of the laminated paper raw material sheet to the nonwoven fabric raw material sheet by the heat-sealing surface 72a of the heat-sealing protrusion 72 of the heat-sealing roller 70 is made up of a straight narrow band portion that extends linearly in the longitudinal direction of the laminated paper 10 and semicircular portions at both longitudinal ends of the straight narrow band portion, as shown in FIGS. 1, 2, and 14, corresponding to the outer shape of each heat-sealing surface 72a. Furthermore, as shown in FIG. 13, on both sides of the thermocompression bonding surface 72a of each thermocompression bonding protrusion 72 in the width direction, a pair of side surfaces 72b extend perpendicular to the thermocompression bonding surface 72a.

[0066] [Second heat seal roller] 9 and 10, the second heat-sealing roller 80 is cylindrical and has the predetermined roller diameter D. On its circumferential surface, non-bonding portions 81 each having a ring-shaped groove shape of a certain width and thermo-compression-bonding protrusions 82 each having a convex ring shape (or a convex strip shape) of a certain width are arranged parallel to each other, alternately 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-sealing roller 80 (i.e., around the entire periphery of the circumferential surface of the second heat-sealing roller 80), and has a compression surface 82a (as the circumferential surface of the thermo-compression-bonding protrusion 82) that is flat in the width direction. The thermo-compression surface 82a of the thermo-compression-bonding protrusion 82 is an arc-shaped surface (curved surface) in the longitudinal direction. Furthermore, the heat-sealing surface 82a of the heat-sealing protrusion 82 is flat in the width direction, but its width is set to be larger than the width of the first heat-sealing portion 11a or the second heat-sealing portion 11b of the heat-sealing portion 11 (i.e., larger than the width of the heat-sealing surface 72a of the heat-sealing protrusion 72 of the first heat-sealing roller 70).

[0067] In this way, the second heat-seal roller 80 has ring-shaped heat-sealed protrusions 82 formed around the entire circumference at positions facing the heat-sealed protrusions 72 of the first heat-seal roller 70. As a result, the pre-heat-sealed laminate paper 10X is sandwiched between the heat-sealed protrusions 72 of the first heat-seal roller 70 and the heat-sealed protrusions 82 of the second heat-seal roller 80, and the crepe paper 1 of the pre-heat-sealed laminate paper 10X is heat-sealed and heat-sealed to the nonwoven fabric 2 between the heat-sealed surfaces 72a of the heat-sealed protrusions 72 and the heat-sealed surfaces 82a of the heat-sealed protrusions 82, thereby forming the heat-sealed portion row 11 of the laminate paper 10.

[0068] Furthermore, as shown in Figure 13, the width of the heat-pressed surface 82a of the heat-pressed protrusion 82 of the second heat-seal roller 80 is set to be a certain dimension larger than the width of the heat-pressed surface 72a of the heat-pressed protrusion 72 of the first heat-seal roller 70, so that when the heat-pressed surface 72a of the heat-pressed protrusion 72 and the heat-pressed surface 82a of the heat-pressed protrusion 82 are arranged facing each other in a substantially close contact state (with a gap equal to the thickness of the heat-sealed portion 11 of the laminated paper 10), a certain width portion of both ends of the heat-pressed surface 82a of the heat-pressed protrusion 82 is exposed on both sides of the width of the heat-pressed surface 72a of the heat-pressed protrusion 72. As a result, when the crepe paper 1 of the pre-heat-fused laminated paper 10X is heat-pressed and heat-fused to the nonwoven fabric 2 between the heat-pressed surface 72a of the heat-pressed protrusion 72 and the heat-pressed surface 82a of the heat-pressed protrusion 82, both widthwise end edges of the heat-pressed surface 72a of the heat-pressed protrusion 72 are positioned on top of the heat-pressed surface 82a of the heat-pressed protrusion 82, thereby significantly reducing the external force (especially shear force) applied to the pre-heat-fused laminated paper 10X from both widthwise end edges of the heat-pressed surface 72a of the heat-pressed protrusion 72. In other words, if the width of the heat-pressed surface 72a of the heat-pressed protrusion 72 and the width of the heat-pressed surface 82a of the heat-pressed protrusion 82 were the same width, when the crepe paper 1 of the pre-heat-fused laminate paper 10X is heat-pressed and heat-fused to the nonwoven fabric 2 between the heat-pressed surface 72a of the heat-pressed protrusion 72 and the heat-pressed surface 82a of the heat-pressed protrusion 82, both widthwise end edges of the heat-pressed surface 72a of the heat-pressed protrusion 72 would be positioned in the same position as both widthwise end edges of the heat-pressed surface 82a of the heat-pressed protrusion 82, and the external force (especially the shear force) applied to the pre-heat-fused laminate paper 10X from both widthwise end edges of the heat-pressed surface 72a of the heat-pressed protrusion 72 would be large, which could result in cutting or damaging part of the pre-heat-fused laminate paper 10X (especially the crepe paper 1). However, as shown in Fig. 13, such a problem can be reliably prevented by setting the width of the thermocompression bonding surface 82a of the thermocompression bonding protrusions 82 of the second heat-seal roller 80 to be a certain dimension larger than the width of the thermocompression bonding surface 72a of the thermocompression bonding protrusions 72 of the first heat-seal roller 70. Note that on both sides in the width direction of the thermocompression bonding surface 82a of the thermocompression bonding protrusions 82 of the second heat-seal roller 80, a pair of side surfaces 82b extend at a predetermined angle (an obtuse angle) to the thermocompression bonding surface 82a.In this way, in the laminated paper manufacturing apparatus, it is preferable that the heat-pressed surfaces 72a, 82a of the heat-pressed protrusions 72, 82 of the lower heat-seal roller 80 are wider than the heat-pressed surface 72a of the upper heat-seal roller 70, and that the corners of both widthwise edge portions of the heat-pressed protrusions 92 of the lower heat-seal roller 80 are cut (notched) to form a tapered (chamfered) or rounded (curved chamfered) cut shape.

[0069] [Roller length and diameter] The roller length L of the heat-seal rollers 70, 80 is preferably in the range of 1200 mm to 1500 mm. If the roller diameter D of the heat-seal rollers 70, 80 is less than 1200 mm, productivity may decrease. On the other hand, if the roller length L of the heat-seal rollers 70, 80 is more than 1500 mm, the problem of the crown phenomenon described below may occur. Furthermore, the roller diameter D of the heat-seal rollers 70, 80 is preferably in the range of 180 mm to 300 mm. If the roller diameter D of the heat-seal rollers 70, 80 is less than 180 mm, the pressure-bonding force of the heat-bonding protrusions 72, 82 on the heat-sealed portion of the pre-heat-sealed laminate paper 10X may be insufficient. On the other hand, if the roller diameter D of the heat-seal rollers 70, 80 is more than 300 mm, high costs may occur.

[0070] [Relationship between the roller diameter and length of the heat seal roller and the pressure during thermocompression bonding] The present inventors have found that, in the thermocompression bonding operation of the pre-heat-sealed laminate paper 10X by the heat seal rollers 70, 80, the pressing force applied from the thermocompression bonding protrusions 72, 82 to the heat-sealed portion of the pre-heat-sealed laminate paper 10X varies depending on the roller diameter D and roller length L of the heat seal rollers 70, 80. The present inventors have also found that, in the thermocompression bonding operation of the pre-heat-sealed laminate paper 10X by the heat seal rollers 70, 80, the pressing force applied from the thermocompression bonding protrusions 72, 82 to the heat-sealed portion of the pre-heat-sealed laminate paper 10X (hereinafter referred to as the "pressing force during thermocompression bonding") needs to be at least 2 to 3 atmospheres or more in order to reliably form the heat-sealed portions 11, 11b, even when the roller length L of the heat seal rollers 70, 80 is small. Furthermore, when the roller length L of the heat-seal rollers 70, 80 is 1400 mm, the pressure during thermocompression bonding is preferably within the range of 5.5 to 7.0 atmospheres. That is, when the roller length L of the heat-seal rollers 70, 80 is 1400 mm, the pre-heat-fused laminate paper 10X is sufficiently durable up to pressures of 5 to 7 atmospheres during thermocompression bonding by the heat-seal rollers 70, 80, and this range is optimal for the pressure during thermocompression bonding. If the pressure during thermocompression bonding is 7 atmospheres or more, the pre-heat-fused laminate paper 10X may be damaged (for example, rupture at a portion corresponding to the corner or the like of the thermocompression bonding surface 72a of the thermocompression bonding protrusion 72).

[0071] Furthermore, if the roller length L of the heat-seal rollers 70, 80 is 1400 mm and the pressure during thermocompression bonding is 7 atmospheres or more, the so-called crown phenomenon (a phenomenon in which the heat-seal rollers 70, 80 bend in the radial direction, creating a gap between the heat-seal rollers 70, 80) may occur. If this crown phenomenon occurs, the heat-seal rollers 70, 80 will bend in the radial direction, creating a drum-shaped gap between the heat-seal rollers 70, 80 when viewed from the front. In this case, although the radial gap created between the heat-seal rollers 70, 80 is very small, a large range will bend in the longitudinal direction of the heat-seal rollers 70, 80, creating a very small gap over that large range. Therefore, although the gap between the heat seal rollers 70, 80 due to this crowning phenomenon is a very small gap of less than 1 mm, because the thickness of the laminated paper raw material sheet (pre-heat-fused laminated paper 10X) is thin, at less than 1 mm, the heat-pressing surfaces 72a, 82a of the heat seal rollers 70, 80 may be floating above the pre-heat-fused laminated paper 10X, creating a gap between them.In this case, the heat-pressing surfaces 72a, 82a of the heat seal rollers 70, 80 will not be able to press the heat-sealed portion of the pre-heat-fused laminated paper 10X.

[0072] Therefore, to avoid this crowning problem, when the roller length L of the heat-seal rollers 70, 80 is 1400 mm, it is preferable to set the pressure during thermocompression bonding within the range of 5.5 to 7.0 atmospheres, as described above. When the roller length L of the heat-seal rollers 70, 80 is 1400 mm, if the pressure during thermocompression bonding is less than 5.5 atmospheres, the thermocompression protrusions 72, 82 may not be able to stably form the heat-sealed portion of the pre-heat-sealed laminate paper 10X (i.e., the adhesive strength of the heat-sealed portion may be insufficient). On the other hand, when the roller length L of the heat-seal rollers 70, 80 is 1400 mm, if the pressure during thermocompression bonding exceeds 7 atmospheres, excessive pressure may be applied to the heat-sealed portion of the pre-heat-sealed laminate paper 10X, potentially hardening the heat-sealed portion during bonding. Furthermore, when the roller length L of the heat-seal rollers 70, 80 is 1200 mm, the pressure during thermocompression bonding may be 4.5 atmospheres. Furthermore, when the roller length L of the heat-seal rollers 70, 80 is 1500 mm, the pressure during thermocompression bonding can be in the range of 7.5 to 8.0 atmospheres. When the roller length L of the heat-seal rollers 70, 80 is 1500 mm and the pressure during thermocompression bonding is less than 7.5 atmospheres, the thermocompression protrusions 72, 82 may not be able to stably form the heat-sealed portion of the pre-heat-sealed laminate paper 10X (i.e., the adhesive strength of the heat-sealed portion may be insufficient). On the other hand, when the roller length L of the heat-seal rollers 70, 80 is 1500 mm and the pressure during thermocompression bonding is more than 8 atmospheres, excessive pressure may be applied to the heat-sealed portion of the pre-heat-sealed laminate paper 10X, causing the heat-sealed portion to harden during bonding.

[0073] [Heat seal roller temperature control] In the laminated paper manufacturing apparatus, in order to reliably heat-seal the crepe paper as the outer layer sheet and the middle layer sheet (nonwoven fabric, non-permeable sheet, etc.) at the heat-sealing portion of the pre-heat-sealed laminated paper 10X, it is preferable to set the temperature during heat-sealing of the heat-sealing rollers 70, 80 (hereinafter referred to as the "heat-sealing temperature") within the range of 175 to 200°C, and to control the temperature so that the temperature distribution is constant throughout the entire length of the heat-sealing rollers 70, 80. If the heat-sealing temperature of the heat-sealing rollers 70, 80 is below 175°C, the crepe paper and nonwoven fabric cannot be reliably bonded by heat fusion at the heat-sealed portion of the pre-heat-fused laminate paper 10X. On the other hand, if the heat-sealing temperature is above 200°C, the heat-sealing resin (PP (polypropylene), PE (polyethylene), etc.) of the intermediate layer sheet may harden and deteriorate, or the intermediate layer sheet itself, such as the nonwoven fabric, may harden, causing the heat-sealing fiber material (heat-sealing synthetic resin fiber) to lose its fusion function (i.e., making it impossible to bond the crepe paper by fusion). Furthermore, as shown in Figure 15(a), it is preferable to control the temperature and rotation of the heat-sealing rollers 70, 80 in the laminate paper manufacturing device so that the heat-sealing temperature of the heat-sealing rollers 70, 80 increases or decreases in proportion to the rotation speed of the heat-sealing rollers 70, 80 (i.e., the feed speed of the pre-heat-sealing laminate paper 10X, in other words, the formation speed of the heat-sealed portion in the longitudinal direction).

[0074] [Heat seal roller rotation control] In the laminated paper manufacturing apparatus, to ensure reliable heat fusion between the crepe paper serving as the outer layer sheet and the middle layer sheet (such as a nonwoven fabric or an impermeable sheet) at the heat-sealed portion of the pre-heat-sealed laminated paper 10X, the heat-sealing rollers 70, 80 begin to rotate once they reach a heat-sealing temperature within the above-mentioned set range, thereby forming the heat-sealed portion of the pre-heat-sealed laminated paper 10X. Furthermore, while the heat-sealing temperature of the heat-sealing rollers 70, 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, 80 by increasing or decreasing it depending on the thickness of the laminated paper raw material sheet (i.e., the thickness of the pre-heat-sealed laminated paper 10X). That is, as shown in Figure 15(c), it is preferable for the laminated paper manufacturing apparatus to control the rotation speed of the heat-sealing rollers 70, 80 so that it increases or decreases in proportion to the thickness (base paper thickness) of the pre-heat-sealed laminated paper 10X. In this case, too, the thermocompression temperature of the heat-seal rollers 70, 80 is maintained constant, and the rotation speed of the heat-seal rollers 70, 80 (base paper feed speed) is increased or decreased depending on the base paper thickness. Similarly, as shown in Figure 15(d), the rotation of the heat-seal rollers 70, 80 can be controlled by the laminated paper manufacturing device so that the rotation speed of the heat-seal rollers 70, 80 increases or decreases in proportion to the thickness of the nonwoven fabric raw material sheet (nonwoven fabric thickness) of the pre-heat-fused laminated paper 10X. In this case, too, the thermocompression temperature of the heat-seal rollers 70, 80 is maintained constant, and the rotation speed of the heat-seal rollers 70, 80 (base paper feed speed) is increased or decreased depending on the nonwoven fabric thickness. Furthermore, as shown in Figure 15(b), the temperature of the heat-seal rollers 70, 80 can be controlled by the laminated paper manufacturing device so that the thermocompression temperature of the heat-seal rollers 70, 80 increases or decreases in proportion to the thickness of the nonwoven fabric (nonwoven fabric thickness) of the pre-heat-fused laminated paper 10X. In this case, too, the rotation speed of the heat seal rollers 70, 80 is maintained constant, and the thermocompression temperature of the heat seal rollers 70, 80 is increased or decreased depending on the thickness of the nonwoven fabric. Here, the thermocompression speed (the length of the row of heat-sealed portions formed on the pre-heat-sealed laminated paper 10X per unit time) by the heat seal rollers is preferably set to, for example, 20 m / min.

[0075] [Uniform temperature control] As described above, the laminated paper manufacturing device controls the thermocompression temperature of the heat-seal rollers 70, 80 to achieve a uniform temperature distribution throughout the heat-seal rollers 70, 80, preventing uneven adhesion in the heat-sealed areas, and the configuration shown in Figure 12 can be used for this temperature control. More specifically, as shown in Figure 11, the heat-seal rollers 70, 80 are each cylindrical with both ends closed by a peripheral wall and a pair of side walls 73, 83, which forms sealed spaces 70S, 80S inside the heat-seal rollers 70, 80, respectively, as shown in Figure 12. The internal spaces 70S, 80S of the heat-seal rollers 70, 80 are sealed spaces maintained in a vacuum state. The laminated paper manufacturing apparatus connects external water supply means to the internal spaces 70S, 80S of the heat-seal rollers 70, 80, respectively, and supplies moisture from these water supply means to the internal spaces 70S, 80S of the heat-seal rollers 70, 80, respectively, and uses the steam obtained by heating the moisture to maintain a constant temperature of the heat-seal rollers 70, 80 when the heat-seal rollers 70, 80 are heated. For example, the laminated paper manufacturing apparatus may store a predetermined amount of water in the internal spaces 70S, 80S of the heat-seal rollers 70, 80 in advance, and use the steam obtained by heating the moisture to maintain a constant temperature of the heat-seal rollers 70, 80 when the heat-seal rollers 70, 80 are heated, or may supply saturated steam or superheated steam to the internal spaces 70S, 80S when the heat-seal rollers 70, 80 are operating, and use the steam to maintain a constant temperature of the heat-seal rollers 70, 80. In this case, high-temperature steam (for example, saturated steam) is applied to the inner surface of the heat-seal rollers 70, 80 in the form of a thin layer or film, and this layer or film of steam maintains a uniform temperature throughout the heat-seal rollers 70, 80. The laminated paper manufacturing device heats the heat-seal rollers 70, 80 with a specified heating means to raise the temperature to the thermo-compression bonding temperature before the heat-seal rollers 70, 80 start the thermo-compression bonding operation.For example, a laminated paper manufacturing device may have an induction coil wound around the heat-seal rollers 70, 80. An AC current is applied to the induction coil to induce eddy currents in the heat-seal rollers 70, 80, heating the rollers to the predetermined thermocompression temperature through Joule heating and maintaining the predetermined temperature constant. In addition to induction heating by the induction heating means, the temperature stabilization operation using steam controls the heat-seal rollers 70, 80 to maintain the predetermined thermocompression temperature uniformly and evenly throughout their entire circumferential and longitudinal directions (particularly, over the entire thermocompression surfaces 72a, 82a of all thermocompression-bonding protrusions 72, 82). This ensures that the temperature distribution of the thermocompression surfaces 72a, 82a of the thermocompression-bonding protrusions 72, 83 of the heat-seal rollers 70, 80 is maintained uniformly across the entire surface. It is preferable that the heating means (heater) of the heat-seal rollers 70, 80 be of the above-mentioned electric type (for example, an induction heating type configuration like the induction heating means.) This can avoid the risk of oil leakage that occurs when the heating means is an oil heater type, and also, compared to the oil heater type, the heating means itself can contribute to stabilizing the temperature distribution of the heat-seal rollers 70, 80.

[0076] Furthermore, the laminated paper manufacturing device controls the pressure applied by the heat-seal rollers 70, 80 during thermal bonding so that it is constant across the entire surface of the opposing surface between the thermal bonding surface 72a of the thermal bonding protrusion 72 and the thermal bonding surface 82a of the thermal bonding protrusion 82. In this way, it is preferable for the laminated paper manufacturing device to simultaneously control the temperature distribution and the pressure distribution of the heat-seal rollers 70, 80, which makes it possible to minimize uneven adhesion at each of the thermally bonded portions 11a, 11b of the thermally bonded portion row 11 of the laminated paper 10.

[0077] [Laminated paper manufacturing method] The laminated paper of the present invention, including the invention of the laminated paper 10 of the above-mentioned embodiments 1 to 3, is preferably manufactured by the laminated paper manufacturing method described below. Note that the laminated paper manufacturing device of embodiment 5 can be suitably used for this laminated paper manufacturing method.

[0078] Sixth embodiment (another example of a laminated paper manufacturing device) The laminated paper manufacturing apparatus of embodiment 5 employs a thermocompression bonding configuration using a pair of heat seal rollers 70, 80 as the means for forming the heat-sealed row 11 of the laminated paper 10 (hereinafter referred to as the "heat-sealing means"). However, other heat-sealing means for forming the heat-sealed row 11 of the laminated paper 10 can also be employed, such as high-frequency welding or ultrasonic welding to bond the crepe paper to an intermediate layer sheet such as a nonwoven fabric (by the fusion action of the heat-sealing component of the intermediate layer sheet). These heat-sealing means using high-frequency welding or ultrasonic welding allow for easy adjustment of the heat-sealing bonding temperature, a wide variety of materials, and the possibility of using inexpensive materials such as thermoplastic resin film sheets with low melting points. For example, the laminated paper manufacturing apparatus shown in FIG. 16 employs a high-frequency sewing machine as the high-frequency welding means in the heat-sealing means. The laminated paper manufacturing apparatus of this embodiment 6 is basically configured in the same way as the laminated paper manufacturing apparatus of embodiment 5, except that the pair of heat seal rollers 70, 80 of the laminated paper manufacturing apparatus of embodiment 5 shown in Figure 9 is replaced with a high-frequency perforation machine 100.A pre-heat-fused laminated paper 10X having a three-layer structure (three-ply structure) with a nonwoven fabric 2 sandwiched between a pair of crepe papers 1 is guided and fed to the high-frequency perforation machine 100 by guide rollers 61, 62, and the high-frequency perforation machine 100 forms a heat-fused section row 11 at a predetermined position of the pre-heat-fused laminated paper 10.After that, the post-heat-fused laminated paper 10Y is guided by guide rollers 63, 64 and wound around the winding roller 55.

[0079] [High frequency sewing machine] The high frequency sewing machine 100 has a first welding roller 101 and a second welding roller 102 arranged opposite each other, and sandwiches the pre-heat-fused laminated paper 10X between the first welding roller 101 and the second welding roller 102 and high frequency welds it to form the heat-fused section row 11. At this time, it is preferable that the high frequency current (for heat welding) applied to the first welding roller 101 and the second welding roller 102 is variously controlled so as to maintain a constant temperature according to various conditions such as the thickness of the base paper and the nonwoven fabric, as described in the laminated paper manufacturing apparatus and laminated paper manufacturing method of the fifth embodiment above.

[0080] [Another aspect of the present invention] The present invention can also be understood as an invention of a laminated paper, a method for manufacturing a laminated paper, or an apparatus for manufacturing a laminated paper, as described below.

[0081] First, the laminated paper according to a first aspect of the present invention comprises a pair of crepe papers as outer layer sheets and a heat-sealable intermediate layer sheet arranged in a laminated state between the crepe papers, and the crepe paper is heat-sealed to the intermediate layer sheet by a linear array of heat-sealed portions extending in a direction perpendicular to the direction of extension of the crepe wrinkles of the crepe paper to form a laminated structure. Furthermore, the laminated paper of the present invention has a printed portion on the inner surface of the intermediate layer sheet or the crepe paper, and the thickness of the crepe paper is set so that the printed portion can be seen from the outside through the crepe paper when the crepe paper is in a wet state.

[0082] A second aspect of the present invention relates to a method for manufacturing laminated paper according to claim 1, wherein the intermediate layer sheet is made of nonwoven fabric, and in order to compensate for shrinkage that occurs during printing of the printed portion on the nonwoven fabric raw material sheet that serves as the raw material sheet for the nonwoven fabric, a nonwoven fabric raw material sheet is used that has a width that is a predetermined percentage larger than the width of the laminated paper that is actually to be obtained, depending on the shrinkage rate.

[0083] A laminated paper manufacturing apparatus according to a third aspect of the present invention is a laminated paper manufacturing apparatus according to the first aspect, comprising a pair of first and second heat seal rollers for forming the row of heat-sealed portions, wherein the first heat seal roller has a convex heat-pressed protrusion corresponding to the heat-sealed portion, and the peripheral surface of the heat-pressed protrusion serves as the heat-pressed surface, and the second heat seal roller has a convex heat-pressed protrusion facing the heat-pressed protrusion of the first heat seal roller, and the peripheral surface of the heat-pressed protrusion serves as the heat-pressed surface facing the heat-pressed surface of the first heat seal roller, and the width of the heat-pressed surface of the heat-pressed protrusion of the second heat seal roller is set to be a certain dimension larger than the width of the heat-pressed surface of the heat-pressed protrusion of the first heat seal roller.

[0084] According to another aspect of the present invention, there is provided a laminated paper comprising a pair of crepe papers as outer layer sheets and a heat-sealable intermediate layer sheet disposed in a laminated state between the crepe papers, wherein the crepe paper is heat-sealed to the intermediate layer sheet by a linear heat-sealed row extending in a direction perpendicular to the direction in which crepe wrinkles extend in the crepe paper to form a laminated structure, a printed section is provided on the surface of the intermediate layer sheet facing one of the crepe papers as the outer layer sheets, and the thickness of the crepe paper is adjusted by the printed section provided on the surface of the intermediate layer sheet when the crepe paper is in a wet state. The thickness of the crepe paper is set so that it can be seen from the outside through the crepe paper, and the printed portion on the intermediate layer sheet can be seen from the outside through the crepe paper even when the crepe paper is dry, and the thickness of the crepe paper on at least the side of the intermediate layer sheet where the printed portion is provided is set so that when the crepe paper is wet, the transparency of the printed portion on the intermediate layer sheet through the crepe increases, thereby increasing the visibility of the printed portion on the intermediate layer sheet from the outside through the crepe paper. In addition, the laminated paper of the present invention can be configured as follows: a pair of crepe papers as outer layer sheets; and a heat-sealable intermediate layer sheet arranged in a laminated state between the crepe papers; the crepe paper is heat-sealed to the intermediate layer sheet by a linear row of heat-sealed portions extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend, thereby forming a laminated structure; a printed portion 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 printed portion can be seen from the outside through the crepe paper when the crepe paper is in a wet state.

[0085] Another aspect of the method for manufacturing laminated paper of the present invention is the method for manufacturing laminated paper of the above-mentioned another aspect, wherein the intermediate layer sheet is made of nonwoven fabric, and the nonwoven fabric is a non-water-absorbent air-through nonwoven fabric manufactured by inter-fiber bonding of core-sheath structure composite fibers, in which the outer sheath is polyethylene and the inner core is polyethylene terephthalate, using an air-through method without using an adhesive, and the printed portion is formed using flexographic printing technology as the printing method and using water-based ink or ultraviolet-curing ink as the printing ink, and in order to compensate for shrinkage during printing of the printed portion on the nonwoven fabric raw material sheet that will become the raw material sheet for the nonwoven fabric, the printed portion is printed on the nonwoven fabric using a nonwoven fabric raw material sheet having a width that is larger by a predetermined percentage than the width of the laminated paper that is actually to be obtained, depending on the shrinkage rate. In addition, the manufacturing method of laminated paper of the present invention can also be configured so that the intermediate layer sheet is made of nonwoven fabric, and in order to compensate for shrinkage during printing of the printed portion on the nonwoven fabric raw material sheet that becomes the raw material sheet of the nonwoven fabric, a nonwoven fabric raw material sheet having a width that is a predetermined percentage larger than the width of the laminated paper that is actually to be obtained is used, depending on the shrinkage rate.

[0086] A laminated paper manufacturing apparatus according to another aspect of the present invention is a laminated paper manufacturing apparatus according to the above-mentioned another aspect, comprising a pair of first and second heat seal rollers for forming the row of heat-sealed portions, wherein the first heat seal roller has a convex heat-pressed protrusion corresponding to the heat-sealed portion, and the peripheral surface of the heat-pressed protrusion serves as the heat-sealed surface, and the second heat seal roller has a convex heat-pressed protrusion facing the heat-pressed protrusion of the first heat seal roller, and the peripheral surface of the heat-pressed protrusion serves as the heat-pressed surface facing the heat-sealed surface of the first heat seal roller, and the width of the heat-pressed surface of the heat-pressed protrusion of the second heat seal roller is set to be a certain dimension larger than the width of the heat-pressed surface of the heat-pressed protrusion of the first heat seal roller.

[0087] Alternatively, the present invention can be understood as an invention of a laminated paper, a method for manufacturing a laminated paper, or an apparatus for manufacturing a laminated paper, as described below.

[0088] First, the present invention can also be understood as a laminated paper comprising a pair of crepe papers as outer layer sheets and a heat-sealable intermediate layer sheet arranged in a laminated state between the crepe papers, wherein the crepe paper is heat-sealed to the intermediate layer sheet by a linear row of heat-sealed portions extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend to form a laminated structure, a printed portion 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 printed portion can be seen from the outside through the crepe paper when the crepe paper is in a wet state.

[0089] Furthermore, the above invention can also be understood as a laminated paper characterized in that the intermediate layer sheet is made of a material on which the printed portion can be printed and that the crepe paper serving as the outer layer sheet can be heat-sealed and bonded to it in the heat-sealing portion row, and the printed portion is provided on the surface of the nonwoven fabric facing one of the crepe papers serving as the outer layer sheets.

[0090] The above invention can also be understood as a laminated paper characterized in that the printed portion is provided on the inner surface of one of the crepe papers serving as the outer layer sheet.

[0091] The above invention can also be understood as a laminated paper characterized in that the intermediate layer sheet is an impermeable sheet made of synthetic resin that blocks the penetration of moisture and / or oil, and the printed portion is provided on the impermeable sheet that serves as the intermediate layer sheet.

[0092] In addition, the nonwoven fabric has a basis weight of 15 to 25 g / m 2 It can also be understood as a laminated paper characterized by having a thickness within the range of

[0093] In addition, the crepe paper has a density of 20 to 50 g / m 2 It can also be understood as a laminated paper characterized by having a thickness within the range of

[0094] The above invention can also be understood as a laminated paper characterized in that the widthwise heat-sealed portion spacing, which is the distance between the widthwise center lines of adjacent heat-sealed portion rows, is set to any value within a predetermined range depending on the range of the crepe rate of the crepe paper, and when the crepe rate of the crepe paper is within the range of 20% to 26%, the widthwise heat-sealed portion spacing is set within the range of 10 mm to 15 mm, and when the crepe rate of the crepe paper is within the range of 26% to 30%, the widthwise heat-sealed portion spacing is set within the range of 15 mm to 25 mm.

[0095] The present invention can also be understood as a method for manufacturing laminated paper of the above-mentioned invention, characterized in that the intermediate layer sheet is made of nonwoven fabric, and in order to compensate for shrinkage during printing of the printed portion on the nonwoven fabric raw material sheet that becomes the raw material sheet of the nonwoven fabric, a nonwoven fabric raw material sheet having a width that is a predetermined percentage larger than the width of the laminated paper that is actually to be obtained is used, depending on the shrinkage rate.

[0096] The present invention can also be understood as a laminated paper manufacturing apparatus according to the above invention, comprising a pair of first and second heat seal rollers for forming the row of heat-sealed portions, the first heat seal roller having a convex heat-pressed protrusion corresponding to the heat-sealed portion, with the peripheral surface of the heat-pressed protrusion serving as a heat-pressed surface, the second heat seal roller having a convex heat-pressed protrusion facing the heat-pressed protrusion of the first heat seal roller, with the peripheral surface of the heat-pressed protrusion serving as a heat-pressed surface facing the heat-pressed surface of the first heat seal roller, and the width of the heat-pressed surface of the heat-pressed protrusion of the second heat seal roller being set to a width that is a certain dimension larger than the width of the heat-pressed surface of the heat-pressed protrusion of the first heat seal roller.

[0097] Now, regarding another aspect of the present invention, the laminated paper according to the first aspect of the present invention comprises a pair of crepe papers as outer layer sheets and a nonwoven fabric as a heat-sealable intermediate layer sheet arranged in a laminated state between the pair of crepe papers, and the crepe paper is heat-sealed to the intermediate layer sheet by a linear row of heat-sealed portions extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend to form a laminated structure, the crepe ratio of the crepe paper is set within a range of 20% to 30%, and the widthwise heat-sealed portion spacing of the row of heat-sealed portions is set within a range of 10 mm to 25 mm, and the widthwise heat-sealed portion spacing increases in proportion to the increase in the crepe ratio of the crepe paper within the widthwise heat-sealed portion spacing range.

[0098] Further, regarding another aspect of the present invention, a laminated paper according to a second aspect of the present invention comprises a pair of crepe papers as outer layer sheets and a nonwoven fabric as a heat-sealable intermediate layer sheet arranged in a laminated state between the pair of crepe papers, and the crepe paper is heat-sealed to the intermediate layer sheet by a linear row of heat-sealed portions extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend to form a laminated structure, and when the crepe rate of the crepe paper is within the range of 20% to 26%, the widthwise heat-sealed portion spacing of the row of heat-sealed portions is set within the range of 10 mm to 15 mm, and when the crepe rate of the crepe paper is within the range of 26% to 30%, the widthwise heat-sealed portion spacing of the row of heat-sealed portions is set within the range of 15 mm to 25 mm, and within this widthwise heat-sealed portion spacing range, the widthwise heat-sealed portion spacing increases in proportion to the increase in the crepe rate of the crepe paper. [Industrial Applicability]

[0099] The laminated paper, the method for manufacturing the laminated paper, and the device for manufacturing the laminated paper of the present invention can be suitably applied to the application of paper towel products, and in the case of paper towel products, they can be applied to paper towel products folded in half, in three, in four, folded like a gate, etc., but in addition to this, the rolled base paper can also be manufactured as is and used as base paper for automatic paper towel manufacturing machines, and in addition to paper towel products, they can also be applied to hygiene products used for purposes such as care and nursing. [Explanation of symbols]

[0100] 1: Crepe paper, 2: Nonwoven fabric (heat-sealable sheet) 10, 40, 50, 60, 70, 80: Laminated paper 11, 12, 41, 42, 51, 61, 82: Heat-sealed parts 11a,12a,41a,42a,51a,61a,82a:Dash point 11b, 12b, 41b, 42b, 51b, 61b, 82b: Non-fused part 30: Second heat seal roller (heat seal roller) 31: First heat seal part (heat seal part) 32: Second heat seal section (heat seal section) 31a, 32a: pressing protrusions, 31b, 32b: non-pressing portions

Claims

1. A laminated paper, The crepe paper that forms the pair, a nonwoven fabric serving as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers; a linear heat-sealed row of portions extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend, thereby heat-sealing the crepe paper to the intermediate layer sheet to form a laminated structure; The row of heat-sealed portions is formed by arranging heat-sealed portions in the form of straight line segments each having a constant length and a constant width at regular intervals in the longitudinal direction in the form of a broken line, The laminated paper is characterized in that each heat-sealed portion in the heat-sealed portion row has both longitudinal ends formed into a curved shape like a flat semicircle.

2. The row of heat-sealed portions is configured by arranging first heat-sealed portions in the form of straight line segments with a constant length and a constant width in a broken line at constant intervals in the length direction, and arranging second heat-sealed portions in the form of straight line segments with the same constant length and width as the first heat-sealed portions at positions shifted relative to the first heat-sealed portions so that the intermediate positions of the second heat-sealed portions coincide with the intermediate positions of the intervals between the first heat-sealed portions, The length of each heat-sealed portion is set to a predetermined length within a range of 35 mm to 45 mm, The width of each heat-sealed portion 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 heat-sealed portion, is set to a predetermined aspect ratio within the range of 13:1 to 23:

1.

3. The row of heat-sealed portions is configured by arranging first heat-sealed portions in the form of straight line segments with a constant length and a constant width in a broken line at constant intervals in the length direction, and arranging second heat-sealed portions in the form of straight line segments with the same constant length and width as the first heat-sealed portions at positions shifted relative to the first heat-sealed portions so that the intermediate positions of the second heat-sealed portions coincide with the intermediate positions of the intervals between the first heat-sealed portions, the laminated paper has a non-fused portion between the adjacent rows of heat-fused 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 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 heat-sealed portion is set to a predetermined length within a range of 35 mm to 45 mm, The width of each heat-sealed portion 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 heat-sealed portion, is set to a predetermined aspect ratio within the range of 13:1 to 23:

1.

4. In each of the rows of heat-sealed portions, a longitudinal heat-sealed portion interval, which is an 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; 2. The laminated paper according to claim 1, wherein the ratio of the length of each heat-sealed portion to the distance between the heat-sealed portions is set to 2:

1.

5. The laminated paper according to claim 1, characterized in that, when hydrated, the laminated paper forms expanded wrinkles that are larger in size than the crepe wrinkles of the crepe paper, and the expanded wrinkles include a first type of expanded wrinkles in which some of the crepe wrinkles do not disappear and remain together with the expanded wrinkles, and a second type of expanded wrinkles in which the crepe wrinkles have completely disappeared.

6. The row of heat-sealed portions is configured by arranging first heat-sealed portions in the form of straight line segments with a constant length and a constant width in a broken line at constant intervals in the length direction, and arranging second heat-sealed portions in the form of straight line segments with the same constant length and width as the first heat-sealed portions at positions shifted relative to the first heat-sealed portions so that the intermediate positions of the second heat-sealed portions coincide with the intermediate positions of the intervals between the first heat-sealed portions, the laminated paper has a non-fused portion between the adjacent rows of heat-fused 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 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 laminated paper forms expanded wrinkles larger in size than the crepe wrinkles of the crepe paper when it absorbs water, The expansion wrinkles of the laminated paper include large expansion wrinkles that extend across almost the entire width of the wide expanded portion, and medium expansion wrinkles that extend across almost the entire width of the narrow expanded portion, The expanded large wrinkles of the laminated paper consist of first expanded large wrinkles in which some of the crepe wrinkles have not disappeared but remain and are mixed with the expanded large wrinkles, and second expanded large wrinkles in which the crepe wrinkles have completely disappeared, The laminated paper according to claim 1, characterized in that the expansion wrinkles of the laminated paper consist of first expansion wrinkles in which some of the crepe wrinkles have not disappeared but remain mixed with the expansion wrinkles, and second expansion wrinkles in which the crepe wrinkles have completely disappeared.

7. The laminated paper of claim 6, 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.

8. The basis weight of the crepe paper is 20 to 50 g / m ２ is set within the range of The basis weight of the nonwoven fabric is 15 to 25 g / m ２ The laminated paper according to any one of claims 1 to 7, characterized in that the thickness is set within the range of 1 / 2 to 1 / 4.

9. 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 9. The laminated paper according to claim 8, wherein the laminated paper is

10. The nonwoven fabric has a density of 20 g / m ２ and Each of the crepe papers is 20 to 35 m ２ 8. The laminated paper of claim 1, wherein the laminated paper has a basis weight in the range of 1:

1.

11. A product made by folding laminated paper, The laminated paper is The crepe paper that forms the pair, a nonwoven fabric serving as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers; a linear heat-sealed row of portions extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend, thereby heat-sealing the crepe paper to the intermediate layer sheet to form a laminated structure; The row of heat-sealed portions is formed by arranging heat-sealed portions in the form of straight line segments each having a constant length and a constant width at regular intervals in the longitudinal direction in the form of a broken line, A product obtained by processing laminated paper, characterized in that each heat-sealed portion in the heat-sealed portion row has both longitudinal ends curved into a flat semicircular shape.

12. The row of heat-sealed portions is configured by arranging first heat-sealed portions in the form of straight line segments with a constant length and a constant width in a broken line at constant intervals in the length direction, and arranging second heat-sealed portions in the form of straight line segments with the same constant length and width as the first heat-sealed portions at positions shifted relative to the first heat-sealed portions so that the intermediate positions of the second heat-sealed portions coincide with the intermediate positions of the intervals between the first heat-sealed portions, The length of each heat-sealed portion is set to a predetermined length within a range of 35 mm to 45 mm, The width of each heat-sealed portion 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 11, characterized in that the aspect ratio, which is the ratio of the length to the width of each heat-sealed portion, is set to a predetermined aspect ratio within the range of 13:1 to 23:

1.

13. The row of heat-sealed portions is configured by arranging first heat-sealed portions in the form of straight line segments with a constant length and a constant width in a broken line at constant intervals in the length direction, and arranging second heat-sealed portions in the form of straight line segments with the same constant length and width as the first heat-sealed portions at positions shifted relative to the first heat-sealed portions so that the intermediate positions of the second heat-sealed portions coincide with the intermediate positions of the intervals between the first heat-sealed portions, the laminated paper has a non-fused portion between the adjacent rows of heat-fused 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 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 heat-sealed portion is set to a predetermined length within a range of 35 mm to 45 mm, The width of each heat-sealed portion 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 11, characterized in that the aspect ratio, which is the ratio of the length to the width of each heat-sealed portion, is set to a predetermined aspect ratio within the range of 13:1 to 23:

1.

14. In each of the rows of heat-sealed portions, a longitudinal heat-sealed portion interval, which is an interval between adjacent heat-sealed portions in the longitudinal direction, is set within a range of 18 mm to 22 mm; 12. A product made by processing laminated paper according to claim 11, wherein the ratio of the length of each heat-sealed portion to the distance between the heat-sealed portions is set to 2:

1.

15. A product made by processing the laminated paper described in claim 11, characterized in that the laminated paper, when hydrated, forms expanded wrinkles that are larger in size than the crepe wrinkles of the crepe paper, and the expanded wrinkles include a first type of expanded wrinkles in which some of the crepe wrinkles do not disappear and remain together with the expanded wrinkles, and a second type of expanded wrinkles in which the crepe wrinkles have completely disappeared.

16. The row of heat-sealed portions is configured by arranging first heat-sealed portions in the form of straight line segments with a constant length and a constant width in a broken line at constant intervals in the length direction, and arranging second heat-sealed portions in the form of straight line segments with the same constant length and width as the first heat-sealed portions at positions shifted relative to the first heat-sealed portions so that the intermediate positions of the second heat-sealed portions coincide with the intermediate positions of the intervals between the first heat-sealed portions, the laminated paper has a non-fused portion between the adjacent rows of heat-fused 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 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 laminated paper forms expanded wrinkles larger in size than the crepe wrinkles of the crepe paper when it absorbs water, The expansion wrinkles of the laminated paper include large expansion wrinkles that extend across almost the entire width of the wide expanded portion, and medium expansion wrinkles that extend across almost the entire width of the narrow expanded portion, The expanded large wrinkles of the laminated paper consist of first expanded large wrinkles in which some of the crepe wrinkles have not disappeared but remain and are mixed with the expanded large wrinkles, and second expanded large wrinkles in which the crepe wrinkles have completely disappeared, A product obtained by processing the laminated paper described in claim 11, characterized in that the expansion wrinkles of the laminated paper consist of first expansion wrinkles in which some of the crepe wrinkles have not disappeared and remain mixed together with the expansion wrinkles, and second expansion wrinkles in which the crepe wrinkles have completely disappeared.

17. A product made by processing the laminated paper described in claim 16, characterized in that the first large expansion wrinkles, second large expansion wrinkles, first medium expansion wrinkles, and 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.

18. The basis weight of the crepe paper is 20 to 50 g / m ２ is set within the range of The basis weight of the nonwoven fabric is 15 to 25 g / m ２ 18. A product obtained by processing the laminated paper according to claim 11, wherein the thickness is set within the range of 1 / 2 mm.

19. 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 19. A product obtained by processing the laminated paper according to claim 18.

20. The nonwoven fabric has a density of 20 g / m ２ and Each of the crepe papers is 20 to 35 m ２ 18. A product obtained by processing the laminated paper of any one of claims 11 to 17, having a basis weight within the range of

21. A paper towel made by subjecting laminated paper to moisture treatment, The laminated paper is The crepe paper that forms the pair, a nonwoven fabric serving as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers; a linear heat-sealed row of portions extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend, thereby heat-sealing the crepe paper to the intermediate layer sheet to form a laminated structure; The row of heat-sealed portions is formed by arranging heat-sealed portions in the form of straight line segments each having a constant length and a constant width at regular intervals in the longitudinal direction in the form of a broken line, A paper towel made by processing laminated paper, characterized in that each heat-sealed portion in the heat-sealed portion row has both longitudinal ends curved into a flat semicircular shape.

22. A laminated paper, The crepe paper that forms the pair, a nonwoven fabric serving as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers; a linear heat-sealed row of portions extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend, thereby heat-sealing the crepe paper to the intermediate layer sheet to form a laminated structure; The row of heat-sealed portions is formed by arranging heat-sealed portions in the form of straight line segments each having a constant length and a constant width at regular intervals in the longitudinal direction in the form of a broken line, Each heat-sealed portion in the heat-sealed portion row has both longitudinal ends each having a curved shape like a semicircle in plan view, The laminated paper further comprises a printing section.

23. The printing unit is provided on either the crepe paper or the nonwoven fabric, 23. The laminated paper according to claim 22, wherein the printed portion is a pattern portion consisting of a single-color or multi-color pattern, or an advertising portion consisting of advertising content.

24. 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 22, 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.

25. A product made by folding laminated paper, The laminated paper is The crepe paper that forms the pair, a nonwoven fabric serving as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers; a linear heat-sealed row of portions extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend, thereby heat-sealing the crepe paper to the intermediate layer sheet to form a laminated structure; The row of heat-sealed portions is formed by arranging heat-sealed portions in the form of straight line segments each having a constant length and a constant width at regular intervals in the longitudinal direction in the form of a broken line, Each heat-sealed portion in the heat-sealed portion row has both longitudinal ends each having a curved shape like a semicircle in plan view, Furthermore, a product obtained by processing laminated paper characterized by having a printed portion.

26. The printed portion is provided on either the crepe paper or the nonwoven fabric in the laminated paper, 26. A product made by processing laminated paper according to claim 25, wherein the printed portion is a pattern portion consisting of a single-color or multi-color pattern, or an advertising portion consisting of advertising content.

27. 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 25, 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.

28. A paper towel made by subjecting laminated paper to moisture treatment, The laminated paper is The crepe paper that forms the pair, a nonwoven fabric serving as a heat-sealable intermediate layer sheet disposed in a laminated state between the pair of crepe papers; a linear heat-sealed row of portions extending in a direction perpendicular to the direction in which the crepe wrinkles of the crepe paper extend, thereby heat-sealing the crepe paper to the intermediate layer sheet to form a laminated structure; The row of heat-sealed portions is formed by arranging heat-sealed portions in the form of straight line segments each having a constant length and a constant width at regular intervals in the longitudinal direction in the form of a broken line, Each heat-sealed portion in the heat-sealed portion row has both longitudinal ends each having a curved shape like a semicircle in plan view, Further, a paper towel made by processing the laminated paper characterized by having a printed portion.

29. The printed portion is provided on either the crepe paper or the nonwoven fabric in the laminated paper, 29. The paper towel made by processing the laminated paper according to claim 28, 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.

30. 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 28, characterized in that the crepe paper on the side of the laminated paper where 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.

31. A laminated paper manufacturing apparatus for manufacturing the laminated paper of claim 1, The laminated paper manufacturing apparatus includes: a pair of heat seal rollers as heat sealing means for forming the heat-sealed portion row of the laminated paper; One of the pair of heat seal rollers has a ridge-shaped heat-compression bonding protrusion corresponding to the heat-sealed portion row of the laminated paper, and the peripheral surface of the heat-compression bonding protrusion serves as a heat-compression surface, A laminated paper manufacturing apparatus for manufacturing laminated paper as described in claim 1, characterized in that both longitudinal ends of the heat-pressing surface of the heat-pressing convex portion of one of the heat-sealing rollers have a flat semicircular curved shape corresponding to the planar shape of both longitudinal ends of the heat-sealed portion of the laminated paper.

32. A laminated paper manufacturing apparatus for manufacturing the laminated paper of claim 1, The laminated paper manufacturing apparatus includes: a pair of heat seal rollers as heat sealing means for forming the heat-sealed portion row of the laminated paper; One of the pair of heat seal rollers has a ridge-shaped heat-compression bonding protrusion corresponding to the heat-sealed portion row of the laminated paper, and the peripheral surface of the heat-compression bonding protrusion serves as a heat-compression surface, the other heat seal roller of the pair of heat seal rollers has a convex stripe-shaped heat compression bonding protrusion facing the heat compression bonding protrusion of the one heat seal roller, and the peripheral surface of the heat compression bonding protrusion serves as a heat compression bonding surface facing the heat compression bonding surface of the one heat seal roller, A laminated paper manufacturing apparatus for manufacturing laminated paper as described in claim 1, characterized in that both longitudinal ends of the heat-pressing surface of the heat-pressing convex portion of one of the heat-sealing rollers have a flat semicircular curved shape corresponding to the planar shape of both longitudinal ends of the heat-sealed portion of the laminated paper.

33. A heat seal roller of a laminated paper manufacturing apparatus for manufacturing the laminated paper of claim 1, The heat seal roller of the laminated paper manufacturing device is a pair of heat seal rollers as heat sealing means for forming the heat-sealed portion row of the laminated paper; One of the pair of heat seal rollers has a ridge-shaped heat-compression bonding protrusion corresponding to the heat-sealed portion row of the laminated paper, and the peripheral surface of the heat-compression bonding protrusion serves as a heat-compression surface, A laminated paper manufacturing apparatus for manufacturing laminated paper as described in claim 1, characterized in that both longitudinal ends of the heat-pressing surface of the heat-pressing convex portion of one of the heat-sealing rollers have a flat semicircular curved shape corresponding to the planar shape of both longitudinal ends of the heat-sealed portion of the laminated paper.

34. A heat seal roller of a laminated paper manufacturing apparatus for manufacturing the laminated paper of claim 1, The heat seal roller of the laminated paper manufacturing device is a pair of heat seal rollers as heat sealing means for forming the heat-sealed portion row of the laminated paper; One of the pair of heat seal rollers has a ridge-shaped heat-compression bonding protrusion corresponding to the heat-sealed portion row of the laminated paper, and the peripheral surface of the heat-compression bonding protrusion serves as a heat-compression surface, the other heat seal roller of the pair of heat seal rollers has a convex stripe-shaped heat compression bonding protrusion facing the heat compression bonding protrusion of the one heat seal roller, and the peripheral surface of the heat compression bonding protrusion serves as a heat compression bonding surface facing the heat compression bonding surface of the one heat seal roller, A heat seal roller of a laminated paper manufacturing device for manufacturing laminated paper as described in claim 1, characterized in that both longitudinal ends of the heat-pressing surface of the heat-pressing convex portion of one of the heat seal rollers have a flat semicircular curved shape corresponding to the planar shape of both longitudinal ends of the heat-sealed portion of the laminated paper.

35. A laminated paper manufacturing apparatus for manufacturing the laminated paper of claim 1, The laminated paper manufacturing apparatus includes: A laminated paper manufacturing apparatus for producing laminated paper as described in claim 1, characterized in that it is equipped with a high-frequency welding means that adheres the crepe paper to the intermediate layer sheet by high-frequency welding or ultrasonic welding as a heat-sealing means, which is a means for forming the heat-sealed portion row of the laminated paper.

36. A laminated paper manufacturing apparatus for manufacturing the laminated paper of claim 1, The laminated paper manufacturing apparatus includes: a high frequency perforation machine is provided as a heat sealing means for forming the heat sealing row of the laminated paper; The high-frequency sewing machine is configured to arrange a first welding roller and a second welding roller opposite each other, and to clamp the stacked crepe paper and nonwoven fabric between the first welding roller and the second welding roller and high-frequency weld them to form a row of heat-sealed portions of the stacked paper, as described in claim 1.

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