Kitchen paper roll and kitchen paper

Abstract

To provide a kitchen paper roll and kitchen paper capable of maintaining water and oil absorbency. [Solution] A kitchen paper roll 10 is a roll of kitchen paper, and when the actual measured value of the paper thickness of the kitchen paper is Tr and the calculated value obtained by dividing the area S occupied by the kitchen paper on a cross section perpendicular to the rotation axis C of the kitchen paper roll 10 by the winding length L of the kitchen paper wound around the kitchen paper roll 10 is Ti, the restoration value obtained by dividing the actual measured value Tr by the calculated value Ti is 1.10 or more, and the winding length of the kitchen paper wound around the kitchen paper roll 10 is 20m to 25m.

Description

Technical Field

[0001] The present invention relates to a kitchen paper roll and kitchen paper capable of maintaining water absorption and oil absorption.

Background Art

[0002] Conventionally, kitchen paper widely used in kitchens and the like is required to efficiently absorb water and oil. Therefore, for example, as disclosed in Patent Document 1, embossing is applied to the sheet constituting the kitchen paper to form voids between the sheets, thereby improving water absorption and oil absorption.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, kitchen paper with a devised shape and structure of the constituent sheets has a thick paper thickness, and when it is formed into a roll, the roll diameter becomes thick, and the number of usable sheets tends to be limited. On the other hand, for example, in the case of kitchen paper with embossing applied to the constituent sheets, if the force for winding the kitchen paper around the paper tube is increased to reduce the roll diameter of the kitchen paper roll, the shape of the embossing may be distorted, and there is a risk that water absorption and oil absorption are impaired.

[0005] Therefore, from the two viewpoints of ensuring the number of usable sheets and maintaining water absorption and oil absorption, it is required to determine the shape and structure of the sheet constituting the kitchen paper. In Patent Document 1, this point is not considered, and there is still room for improvement in the optimal shape and structure of the sheet constituting the kitchen paper.

[0006] An object of the present invention is to provide a kitchen paper roll and kitchen paper capable of maintaining water absorption and oil absorption.

Means for Solving the Problems

[0007] The kitchen paper roll according to the present invention is a kitchen paper roll in which kitchen paper is in a roll shape. When the actually measured value of the paper thickness of the kitchen paper is Tr, and in a cross-section orthogonal to the rotation axis of the kitchen paper roll, the area occupied by the kitchen paper is divided by the winding length of the kitchen paper wound around the kitchen paper roll to obtain a calculated value Ti, when the restoration value obtained by dividing the actually measured value Tr by the calculated value Ti is 1.10 or more, and the winding length of the kitchen paper wound around the kitchen paper roll is 20 m to 25 m.

[0008] Further, the kitchen paper according to the present invention can be pulled out from the kitchen paper roll according to the present invention and used.

Effects of the Invention

[0009] According to the present invention, since the shape and structure of the sheet constituting the kitchen paper, which have water absorption and oil absorption, are maintained, it is possible to maintain water absorption and oil absorption.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0011] Three embodiments, namely the first to third embodiments, for carrying out the kitchen paper roll according to the present invention will be described in detail with reference to Figs. 1 to 5. However, the present invention is not limited to the aspects of this embodiment.

[0012] <First Embodiment> Fig. 1 shows an overall perspective view of a kitchen paper roll 10 according to the first embodiment of the present invention. Fig. 2 is a diagram for explaining a kitchen paper 1 pulled out from the kitchen paper roll 10 according to this embodiment, the kitchen paper having embossments where concave portions and convex portions are adhered to each other. Fig. 2(a) is a plan view, and Fig. 2(b) is a schematic cross-sectional view taken along the line IIb-IIb in Fig. 2(a). Fig. 3 shows a schematic cross-sectional view of the kitchen paper roll 10 according to this embodiment.

[0013] The kitchen paper roll 10 according to this embodiment is composed of two-ply kitchen paper wound around a paper tube 14 (core). The two layers of sheets constituting the kitchen paper are each provided with concave portions and convex portions by embossing before being wound around the paper tube 14, and the convex portions and concave portions of the embossments applied to the two layers of sheets overlap (so-called nested type) (in the second embodiment described later, the convex portions of the embossments applied to the two layers of sheets overlap (so-called tip-to-tip type), and in the third embodiment described later, one side of the two layers of sheets constituting the kitchen paper is embossed in a state where they are overlapped (so-called single emboss)).

[0014] The kitchen paper 1 pulled out from the kitchen paper roll 1 according to this embodiment is a laminated continuous sheet 13 formed by laminating a front sheet (first layer) 11 on which a first embossed portion 11e is formed and a back sheet (second layer) 12 on which a second embossed portion 12e is formed. As shown in FIG. 2(b), the first embossed portion 11e is constituted by forming a first embossed convex portion 11p on one surface of the front sheet 11 and a first embossed concave portion 11r corresponding to the first embossed convex portion 11p on the other surface. Further, as shown in FIG. 2(b), the second embossed portion 12e is constituted by forming a second embossed convex portion 12p on one surface of the back sheet 12 and a second embossed concave portion 12r corresponding to the second embossed convex portion 12p on the other surface. That is, a first embossed convex portion 11p is formed on one surface of the front sheet 11 so as to correspond to the first embossed concave portion 11r formed on the other surface of the front sheet 11, and a second embossed convex portion 12p is formed on one surface of the back sheet 12 so as to correspond to the second embossed concave portion 12r formed on the other surface of the back sheet 12.

[0015] As shown in FIG. 2(a), the shapes of the first embossed portion 11e and the second embossed portion 12e applied to the kitchen paper according to this embodiment are in a pattern in which dot-shaped embosses are arranged in an oblique lattice. In the present invention, the shape of the emboss applied to the kitchen paper (that is, the outer contour of the depression of the concave portion) is not limited to a circular dot shape as in this embodiment, and may have corners. When the shape of the emboss has corners, the emboss is less likely to be crushed, and it becomes possible to maintain the effects of the emboss described later. In the present invention, the shape of the emboss applied to the kitchen paper (that is, the outer contour of the depression of the concave portion) may be polygonal.

[0016] In the kitchen paper 1 according to the present invention, one surface of the front sheet 11 and one surface of the back sheet 12 are adhered via an adhesive portion 15, and the first embossed concave portions 11r and the second embossed concave portions 12r can be respectively formed such that the depressions of the first embossed concave portions 11r and the second embossed concave portions 12r are arranged on the other surface of the front sheet 11 and the other surface of the back sheet 12. In the kitchen paper 1 according to the present embodiment, as shown in FIG. 2(b), the top of the first embossed convex portion 11p and the surface of one surface of the back sheet 12 that is not embossed are adhered via the adhesive portion 15, and the top of the second embossed convex portion 12p and the surface of one surface of the front sheet 11 that is not embossed are adhered via the adhesive portion 15. Due to the concave shapes of the first embossed concave portion 11r and the second embossed concave portion 12r formed by such a joined configuration, the area in contact with oil becomes wider, and it is possible to quickly absorb the oil.

[0017] Also, due to the above-described joined configuration, as shown in FIG. 2(b), a gap G is formed between the first embossed convex portion 11p and the second embossed convex portion 12p. This gap G makes it possible to confine the absorbed water, improving the water absorption.

[0018] <Second Embodiment> FIG. 4 is a diagram for explaining a kitchen paper roll 10' having embossings in which convex portions are adhered to each other according to the second embodiment of the present invention, and is a schematic cross-sectional view taken along the line IIb-IIb in the direction of FIG. 2(a). Among the elements constituting the kitchen paper roll 10' according to the present embodiment, those having the same functions are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted.

[0019] The shape of the first embossed portion 11'e and the second embossed portion 12'e of the kitchen paper 1' according to the present embodiment, as viewed from above, is a pattern in which dot-like embossings are aligned, as shown in FIG. 2(a), similar to the first embodiment.

[0020] In the kitchen paper 1' according to this embodiment, as shown in FIG. 4, the top of the first embossed convex portion 11p and the top of the second embossed convex portion 12p are adhered via the adhesion portion 15. Due to the recessed shapes of the first embossed recess 11r and the second embossed recess 12r formed by such a joined configuration, similar to the first embodiment, the area in contact with oil becomes wider, and it is possible to quickly absorb the oil.

[0021] By joining a plurality of the first embossed convex portions 11p and a plurality of the second embossed convex portions 12p, as shown in FIG. 2(b), a gap G is formed therebetween. Due to this gap G, similar to the first embodiment, it is possible to confine the absorbed water, improving the water absorption.

[0022] <Third Embodiment> FIG. 5 is a diagram for explaining a kitchen paper roll 10'' obtained by laminating two-ply sheets and performing embossing according to the third embodiment of the present invention, and is a schematic cross-sectional view in the direction of IIb-IIb of FIG. 2(a). Among the elements constituting the kitchen paper roll 10'' according to this embodiment, those having the same functions are denoted by the same reference numerals as in the first embodiment, and the description thereof is omitted.

[0023] The shapes of the upper surface views of the first embossed portion 11''e and the second embossed portion 12''e applied to the kitchen paper according to this embodiment are, similar to the first embodiment, a pattern in which dot-shaped embosses are aligned, as shown in FIG. 2(a).

[0024] In the kitchen paper according to this embodiment, as shown in FIG. 5, the first embossed portion 11''e and the second embossed portion 12''e are formed by laminating two-ply sheets and performing embossing. Due to the recessed shapes of the first embossed recess 11r and the second embossed recess 12r formed by the above embossing, similar to the first embodiment, the area in contact with oil becomes wider, and it is possible to quickly absorb the oil.

[0025] <Common configurations of the kitchen papers according to the first to third embodiments of the present invention> The basis weight of one sheet taken out (for example, with a cut in between) and cut from the kitchen paper roll according to the present invention is 15 to 25 g / m 2 which is preferably. More preferably 19 to 23 g / m 2 The basis weight is determined according to JIS P 8124 (1998).

[0026] In the kitchen paper according to the first to third aspects of the present invention, as shown in FIGS. 2(b), 4, and 5, the depths H1, H’1, H’’1 of the first embossed concave portions 11r and the second embossed concave portions 12r, and the heights H2, H’2, H’’2 of the first embossed convex portions 11p and the second embossed convex portions 12p, the suitable ranges for effectively achieving the effects of the present invention are each 200 to 450 μm. Also, in the kitchen paper according to the first to third aspects of the present invention, the area (for one) of each concave portion or each convex portion is made to be 0.40 to 4.20 mm 2 / piece. In the present invention, the area (for one) of each concave portion or each convex portion is more preferably made to be 0.40 to 2.00 mm 2 / piece. Further, the density of the embossing applied to the kitchen paper according to the first to third aspects of the present invention is appropriately set to 5.0 to 12.0 pieces / cm 2 The ratio of the area of the concave portions per unit area of the kitchen paper according to the first to third aspects of the present invention is preferably 3% to 50%. In the present invention, the ratio of the area of the concave portions per unit area of the kitchen paper is more preferably 3% to 20%. In the kitchen paper according to the first to third aspects of the present invention, the concave portions or the convex portions are formed by embossing in a pattern with a separation interval of about 2 to 5 mm.

[0027] The kitchen paper rolls according to the first to third aspects of the present invention are each manufactured so as to satisfy certain conditions (for example, the lower limit value of the parameters corresponding to the recovery rate and the recovery amount).

[0028] In the first embodiment of the present invention, the paper thickness of the kitchen paper 1 pulled out from the kitchen paper roll 10 is measured in accordance with ISO12625-3. Let the measured value of the paper thickness of this kitchen paper 1 be Tr, and in the cross-sectional plane orthogonal to the rotation axis C of the kitchen paper roll 10, when the area S occupied by the kitchen paper is divided by the winding length L of the kitchen paper wound around the kitchen paper roll 10 to obtain a calculated value Ti, it is preferable for the present invention to have an restoration value obtained by dividing the measured value Tr by the calculated value Ti of 1.10 or more. The present invention is not limited to this, and the restoration value is preferably 1.15 or more, 1.25 or more, 1.27 or more, 1.40 or more in this order. The paper thickness of the kitchen paper 1 can be measured by various known measuring methods as long as it complies with ISO12625-3. As shown in Fig. 3, the area S occupied by the kitchen paper is obtained by subtracting the value obtained by multiplying π by the square of d / 2 from the value obtained by multiplying π by the square of D / 2, where d is the diameter (core diameter) of the paper tube 14 and D is the winding diameter of the kitchen paper roll 10.

[0029] When the restoration value is 1.10 or more, there is sufficient restoring force, so even after the kitchen paper is wound into a roll and pulled out from the kitchen paper roll, the shape of the emboss is stable, the oil absorption property is maintained, and the water absorption property is maintained because the gap G of the emboss is maintained. On the other hand, if it is less than 1.10, for example, since there is not enough restoring force, the shape of the emboss is deformed when the kitchen paper is wound into a roll, and even after being pulled out from the kitchen paper roll, the shape of the emboss remains deformed, and the above gap G may be narrowed or the shape of the emboss may collapse, and there is a risk that the water absorption and oil absorption properties are not maintained.

[0030] Also, when the restored value is 1.10 or more, the theoretical value of the paper thickness becomes smaller than the measured value of the paper thickness (see Examples 1 to 9 in Tables 1 and 2 below). Since the winding diameter can be kept small, the winding length can be increased accordingly, and the number of available sheets can be ensured. On the other hand, when it is less than 1.10, the theoretical value of the paper thickness hardly changes from the measured value of the paper thickness (see Comparative Examples 1 to 3 in Table 2 below), and the winding diameter also does not change. Therefore, the winding length cannot be made sufficiently long, and there is a possibility that the number of available sheets cannot be ensured sufficiently.

[0031] Regarding the paper thicknesses of the kitchen papers 1' and 1'' pulled out from the kitchen paper rolls according to the second and third aspects of the present invention, similarly to the first aspect, they are measured in accordance with ISO 12625-3, and the restored value obtained by dividing the measured value Tr by the calculated value Ti is 1.10 or more.

[0032] <Method for manufacturing kitchen paper according to the present invention> The method for manufacturing the kitchen paper of the present invention includes a step of papermaking a slurry containing pulp to obtain a single-ply kitchen paper web, a step of embossing the kitchen paper roll, and a step of laminating the kitchen paper webs. The steps of embossing and laminating may be performed in this order, or laminating may be performed first and then embossing may be performed. By performing embossing before the laminating step, the thickness feeling of the laminated kitchen paper can be further enhanced, and the usability can be improved. Hereinafter, the manufacturing process of the kitchen paper will be described in order.

[0033] Here, in at least one of the following steps: (1) pulp blending step, (2) pulp beating step, (3) chemical addition step, (5) dehydration step and pressing step (wet creping step), (6) drying step (dry creping step), and (8) embossing step, the paper quality of the kitchen paper web can be adjusted so that the restored value of the kitchen paper falls within an optimal range. Thereby, kitchen papers corresponding to various uses can be manufactured.

[0034] Before the step of obtaining a single-ply kitchen paper web, a step of bleaching the pulp may be included. Examples of the bleaching agent used in the bleaching step include known bleaching agents such as oxygen-based bleaching agents and chlorine-based bleaching agents.

[0035] First, the step of obtaining a single-ply kitchen paper web includes a step of obtaining a slurry containing pulp. This step of obtaining the slurry further includes (1) a step of blending the pulp, (2) a step of beating the pulp, and (3) a step of adding chemicals.

[0036] (1) Step of blending the pulp In the step of blending the pulp, pulp fibers of a known composition suitable for kitchen paper are adopted and produced, and it is suitable to contain 90 to 100% by mass of virgin pulp. As a pulp composition in which the specific effects of the present invention are remarkable, softwood pulps such as NBKP (needle kraft pulp) and NUKP (needle unbleached pulp), and hardwood pulps such as LBKP (hardwood kraft pulp) and LUKP (hardwood unbleached pulp) are preferably blended at an appropriate ratio. In particular, the ratio of softwood pulp to hardwood pulp is optimally 10:90 to 90:10.

[0037] (2) Step of beating the pulp In the step of beating the pulp, mechanical beating treatment (for example, a double disk refiner, etc.) is applied to the pulp fibers. At this time, the softwood pulp and the hardwood pulp may be beaten separately or after being mixed. By fibrillating the pulp fibers by the beating treatment, the paper quality of the kitchen paper web can be adjusted. Here, it is appropriate to set the freeness represented by CSF: Canadian Standard Freeness of the fiber component (pulp component) contained in the kitchen paper indicating the degree of beating to 300 to 650 ml.

[0038] (3) Step of adding chemicals In the step of adding chemicals, optional components may be added to pulp fibers. Examples of the optional components include, for example, dry paper strengthening agents, wet paper strengthening agents, and the like. Examples of the dry paper strengthening agents include, for example, cationized starch, polyacrylamide (PAM), carboxymethyl cellulose (CMC), and the like. Examples of the wet paper strengthening agents include polyamide epichlorohydrin, urea, melamine, heat-crosslinkable polyacrylamide, and the like.

[0039] The step of obtaining a one-ply kitchen paper web includes the step of forming a slurry containing pulp into a paper sheet. Examples of the paper machine used in the step of forming a paper sheet include, for example, suction breast formers (cylinder type, fourdrinier type), twin-wire formers, cylinder formers (C-wrap, S-wrap), crescent formers, and other paper machines. The step of forming this slurry into a paper sheet further includes a (4) supply step, a (5) dehydration and pressing step, a (6) drying step, and a (7) base paper winding step.

[0040] (4) Supply step In the supply step, a slurry containing pulp is supplied onto a wire mesh to form a thin layer of pulp. Generally, the wire is made of a metal or plastic mesh loop. Here, for example, there are methods of forming a wet paper as a uniform single layer by forming a paper sheet from a pulp slurry mixed with softwood pulp and hardwood pulp, methods of forming a single wet paper by laminating a pulp slurry mixed with softwood pulp and hardwood pulp, methods of forming a single wet paper by laminating a softwood pulp layer and a hardwood pulp layer, and the like, and any of these methods may be adopted.

[0041] (5) Dehydration and pressing step In the dewatering process, while being transferred towards the press part, the moisture of the thin layer of pulp is removed through the wire to the underside, thereby dehydrating the thin layer of pulp. After the dewatering process, in the pressing process, the wet paper moves from the wire to the felt. By applying pressure to the wet paper with a press roll through the felt, the wet paper is further mechanically squeezed for water. Here, by subjecting the wet paper to wet creping (wet creping process), a plurality of crepes extending in the width direction of the kitchen paper can be imparted, and the paper quality of the kitchen paper web can be adjusted.

[0042] (6) Drying process In the drying process after the pressing process, for example, it is preferably a process of blowing hot air towards the wet paper or a process of pressing a dryer cylinder against the outer peripheral surface. Here, by subjecting the dried paper to dry creping (dry creping process), a plurality of crepes extending in the width direction of the kitchen paper can be imparted, and the paper quality of the kitchen paper web can be adjusted.

[0043] (7) Base paper winding process After the drying process, a base paper winding process is provided. In the base paper winding process, the kitchen paper web finished through the above processes is wound up to obtain a single-ply base paper roll. At this time, it is preferable to wind it so that the outer winding surface of the kitchen paper web becomes the outer peripheral surface of the base paper roll.

[0044] Next, in the process of laminating single-ply kitchen paper webs, two single-ply base paper rolls are fed into a processing machine, and while unwinding, an (8) embossing process on the surface of the base paper and a (9) laminating process into a two-ply are performed.

[0045] (8) Embossing process The embossing process is performed, for example, by using a steel-rubber type embossing device and applying pressure with an embossed embossing roll. By changing the amount of indentation or the indentation pressure of the embossing roll, an embossed shape having a predetermined embossing height can be formed. Here, it is preferable to perform the embossing process before the lamination process described later. Here, when providing an embossing on the kitchen paper, the area of the embossing (per one) is suitably set to 0.40 to 2.00 mm2 / piece. Also, the height of the embossing (depth of the concave portion) applied to the kitchen paper is suitably set to 200 to 450 μm. Further, the density of the embossing applied to the kitchen paper is suitably set to 5.0 to 12.0 pieces / cm2.

[0046] (9) Lamination process In the lamination process, two or more single-ply kitchen paper webs are laminated and bonded. It is preferable to perform the lamination to two plies so that the outer surfaces of the outer sides of the single-ply base paper rolls face outward. In this process, for example, after overlapping the base papers, an adhesive for bonding is applied to the embossed convex portions of the product, and the single plies are laminated. At that time, it is preferable to laminate with the surface pushed in by the embossing roll facing outward from the viewpoint of better wiping property. Here, the area of the bonded portion (per one) is suitably set to 0.40 to 1.20 mm2 / piece. Also, the adhesive strength of the bonded portion is suitably set to 0.50 to 3.00 N. Further, the density of the bonded portion is suitably set to 5.0 to 24.0 pieces / cm2. The measurement of the adhesive strength of the bonded portion can be performed under the same conditions as the following tensile strength measurement method.

[0047] Conventionally, kitchen paper widely used in kitchens and the like is required to efficiently absorb water and oil. For example, Patent Document 1 discloses an attempt to meet this requirement by embossing the sheets constituting the kitchen paper to form voids between the sheets.

[0048] By the way, kitchen paper with a special shape or structure of the constituent sheet has a thick paper thickness. When it is rolled up, the roll diameter becomes thick, and the number of available sheets tends to be limited. On the other hand, for example, in the case of kitchen paper with an embossed pattern on the constituent sheet, if the force to wind the kitchen paper around the paper tube is increased to make the roll diameter of the kitchen paper roll thinner, the shape of the emboss may be distorted, and there is a risk of impairing water absorption and oil absorption.

[0049] Therefore, from the two viewpoints of ensuring the number of available sheets and maintaining water absorption and oil absorption, it is required to determine the shape and structure of the sheet constituting the kitchen paper.

[0050] According to the first to third aspects of the present invention, since the shape and structure of the sheet constituting the kitchen paper having water absorption and oil absorption are maintained, it is possible to maintain water absorption and oil absorption.

[0051] In addition, while ensuring the water absorption and oil absorption of the kitchen paper, it is possible to make the roll diameter compact and the roll length long, so that it is possible to ensure the number of available sheets.

[0052] Furthermore, according to the first to third aspects of the present invention, as will be described later, it is possible to improve the wiping property.

[0053] As a preferable range for effectively exerting the effects of the present invention, the elongation in the longitudinal direction of the kitchen paper roll is 10.0% to 25.0%, the elongation in the width direction of the kitchen paper is 4.0% to 7.0%, the tensile strength at dry time in the longitudinal direction of the kitchen paper is 5.0 N to 13.0 N, and the tensile strength at dry time in the width direction of the kitchen paper is 1.5 N to 4.5 N.

[0054] In addition, in terms of a preferable range for effectively demonstrating the effects of the present invention, the weight of the kitchen paper roll is 150 g to 320 g, more preferably 200 g to 250 g; the winding diameter D of the kitchen paper roll is 110 mm to 120 mm; the winding length L of the kitchen paper is 14 m to 35 m, more preferably 20 m to 25 m; the diameter d of the paper tube 14 is 38 mm to 42 mm; the actually measured value Tr of the paper thickness of the kitchen paper is 450 μm to 670 μm, more preferably 450 μm to 650 μm. Here, the weight of the kitchen paper roll includes the weight of the paper tube.

[0055] <Comparative Evaluation of Physical Properties> In the kitchen paper rolls according to Examples 1 to 9 of the present invention, a comparative evaluation was performed on 22 parameters related to physical properties with respect to Comparative Examples 1 to 3. The comparative evaluation is shown in Tables 1 and 2 below. It should be noted that Examples 1 to 7 and Comparative Examples 1 to 3 are of the nested type (refer to Fig. 2(b)) as in the above-described first form, Example 8 is of the tip-to-tip type (refer to Fig. 4) as in the above-described second form, and Example 9 is of the single emboss type (refer to Fig. 5) as in the above-described third form. Comparative Examples 1 to 3 are of the nested type as in the above-described first form, but as will be described later, it can be understood from Tables 1 and 2 that the restoration value, elongation, tensile strength, water absorption, oil absorption, wiping property, etc. are clearly different from those of Examples 1 to 9.

[0056]

Table 1

[0057]

Table 2

[0058] <Regarding the Depth of the Recess> The "depth of the recess" described in Table 1 and Table 2 represents the difference between the paper thickness of the base paper before embossing (measured by ISO) and the paper thickness of the product state (measured by ISO) when the structure is nested. That is, the "depth of the recess" represents the difference when subtracting the paper thickness of the base paper from the measured value Tr of the paper thickness. When the structure is Tip to Tip, since the embossed protrusions overlap, it becomes half of the paper thickness of the nested structure. Here, the paper thickness of the base paper is around 205 μm.

[0059] The shape of the recess (depth of the recess) was measured using a 3D shape measuring instrument VR-3000 and an analysis application VR-H2A (both manufactured by Keyence Corporation). The procedure was as follows in I~IV below. I: Using the 3D shape measuring instrument VR-3000, the 3D shape of the recess was photographed at a magnification of 12 times. II: Using the function of the analysis application VR-H2A, a reference line was set for all of the 3D shape of the recess. III: Using the distortion correction function of the shape correction tool provided in the same application, the distortion of the measurement data of the 3D shape of the recess was corrected. IV: Using the function of the same application, the part below the reference line was taken as the recess, and the average value of the depth of the recess was calculated. This was obtained by measuring the depth of the recess at 6 randomly selected locations for each of 5 samples per level, and averaging the resulting 30 values.

[0060] <Regarding density> Regarding the density in Table 1 and Table 2, the density of the kitchen paper of the present invention is obtained by dividing the basis weight per sheet (1 ply) (g / m 2 ) by the measured value Tr (μm) of the paper thickness of the kitchen paper, and then doubling that value (g / cm 3 ).

[0061] <Regarding tensile strength> Regarding the tensile strength in Tables 1 and 2, the dry tensile strength (T) in the longitudinal direction (vertical direction) of the kitchen paper of the present invention is preferably lower than 13.0 N, more preferably lower than 11.0 N, and even more preferably lower than 10.3 N. The dry tensile strength (Y) in the width direction (horizontal direction) of the kitchen paper of the present invention is preferably lower than 4.5 N, more preferably lower than 4.0 N, and even more preferably lower than 3.8 N.

[0062] The dry tensile strength of the kitchen paper in this specification (tensile strength in Tables 1 and 2) is a value obtained by cutting a sample of the kitchen paper into a width of 15 mm and a span length of 100 mm, measuring it under the condition of a tensile speed of 50 mm / min, and calculating the average of 10 measurements. For the measurement of the dry tensile strength, for example, a horizontal tensile testing machine (manufactured by Kumagai Riki Kogyo Co., Ltd.) can be used. The measurement of the dry tensile strength was carried out in an environment conforming to ISO187 (temperature 23 ± 1°C, relative humidity 50 ± 2%).

[0063] <Regarding elongation> Regarding the elongation in Tables 1 and 2, the elongation rate (%) in the longitudinal direction (vertical direction) of the kitchen paper of the present invention is preferably lower than 30.0%, more preferably 25.0% or less, and particularly preferably 19.0% or less. Also, the elongation rate (%) in the width direction (horizontal direction) of the kitchen paper of the present invention is preferably lower than 10.0%, and more preferably 7.0% or less.

[0064] The elongation rate of the kitchen paper in this specification (elongation in Tables 1 and 2) is a value obtained by cutting a sample of the kitchen paper into a width of 15 mm and a span length of 100 mm, measuring it under the condition of a tensile speed of 50 mm / min, and calculating the average of 10 measurements. The measurement of the elongation rate was carried out in an environment conforming to ISO187 (temperature 23 ± 1°C, relative humidity 50 ± 2%).

[0065] The elongation rate (%) is calculated from the following formula. Elongation rate (%) = Elongation amount of sample (mm) × 100 / Span length (mm) Note that the "tensile strength" and "elongation" can be measured by a test method compliant with JIS P 8113.

[0066] <Regarding water absorption and oil absorption> Regarding the water absorption and oil absorption in Table 1 and Table 2, in the case of water absorption measurement, 0.1 g of ion-exchanged water was dropped from a height of 10 mm onto a kitchen paper (10 mm × 10 mm), and in the case of oil absorption measurement, 0.05 g of salad oil was dropped. The time until the liquid was absorbed and the light reflection disappeared from the sample surface (by visual observation) was measured.

[0067] Regarding water absorption, it was rated as "acceptable" if it was 1.1 seconds or less, "good" if it was 0.8 seconds or less, and "excellent" if it was 0.7 seconds or less.

[0068] Regarding oil absorption, it was rated as "acceptable" if it was 13.9 seconds or less, "good" if it was 12.0 seconds or less, and "excellent" if it was 11.0 seconds or less.

[0069] Note that the above dropping method was conducted by a test method compliant with No. 32-2 of the JAPAN TAPPI pulp test method, and the immersion method was conducted by a test method compliant with No. 32-1 of the JAPAN TAPPI pulp test method.

[0070] <Regarding wiping property> Regarding the wiping property in Table 1 and Table 2, it was evaluated on a 5-point scale from 1 to 5, and the higher the numerical value, the better the wiping property.

[0071] Regarding the "wiping property" of the product, 50 monitors were asked to evaluate it as follows: those who felt "particularly excellent" were given 5 points, those who felt "excellent" were given 4 points, those who felt "good" were given 3 points, those who felt "ordinary" were given 2 points, and those who felt "inferior" were given 1 point.

[0072] The decimal part of the average value of the evaluation scores of the 50 people was rounded off, and the evaluation was made on a 5-point scale from 1 to 5.

[0073] <Regarding restoration value> If the restoration value (Tr / Ti) is 1.10 or more, both the water absorption and oil absorption degrees can be "acceptable" or more, and both the wiping properties can be "2" or more. If the restoration value is 1.25 or more, both the water absorption and oil absorption degrees are "good" or more and are further excellent, and both the wiping properties are "4" or more and are further excellent. If the restoration value is 1.40 or more, both the water absorption and oil absorption degrees are "excellent" or more and are particularly excellent, and both the wiping properties are "5" or more and are further excellent.

[0074] As shown in Table 1 and Table 2, since the restoration values according to Example 7, Example 8, and Example 9 of the present invention are 1.12, 1.15, and 1.24 respectively, according to each of Example 7 to Example 9, both the water absorption and oil absorption degrees can be obtained as "acceptable" or more respectively, and both the wiping properties can be obtained as "2" or more respectively. Since the restoration values according to Example 5 and Example 6 are 1.28 and 1.25 respectively, according to Example 5 and Example 6, both the water absorption and oil absorption degrees can be obtained as "good" respectively, and both the wiping properties can be obtained as "4" or more respectively. Since the restoration values according to Example 1, Example 2, Example 3, and Example 4 are 1.46, 1.40, 1.58, and 1.53 respectively, according to each of Example 1 to Example 4, both the water absorption and oil absorption degrees can be obtained as "excellent" respectively, and both the wiping properties can be obtained as "5" or more respectively.

[0075] As shown in Table 1 and Table 2, since the restoration values according to each of Example 1 to Example 9 of the present invention are 1.10 or more, according to each of Example 1 to Example 9 of the present invention, the water absorption and oil absorption properties can be maintained, and the effect of the present invention of improving the wiping properties can be effectively obtained. On the other hand, for Comparative Example 1 to Comparative Example 3, since the restoration values are less than 1.10, the above-described effects of the present invention cannot be obtained.

[0076] The restoration value (or wiping property) of the kitchen paper according to the present invention affects the "elongation" of the kitchen paper. This restoration value can also be said to be a value representing the restoration of the emboss, and the stretchability is affected. As one of the factors affecting this stretchability, the elongation (%) is related. Referring to Table 1 and Table 2, the "elongation" of the kitchen paper from Example 1 to Example 9 is in the range of 13.4% to 22.7% in the longitudinal direction (the first range) and in the range of 4.9% to 6.5% in the lateral direction (the second range). On the other hand, the "elongation" of the kitchen paper from Comparative Example 1 to Comparative Example 3 deviates from these ranges, being in the range of 24.3% to 25.0% in the longitudinal direction and in the range of 7.5% to 7.8% in the lateral direction. That is, by setting the "elongation" of the kitchen paper in the longitudinal direction to the above first range and the "elongation" in the lateral direction to the above second range, it is possible to manufacture a kitchen paper roll having a restoration value of 1.10 or more. This longitudinal "elongation" and lateral "elongation" can be adjusted by the creping process in the (5) dehydration process and pressing process and the (6) drying process in the above manufacturing process. That is, it can be said that the crepe affecting the "elongation" of the kitchen paper also affects the wiping property.

[0077] <Others> The present invention is not limited to the above-described various forms, each example, and the modification examples described throughout, and appropriate changes and modifications can be made without departing from the technical idea of the present invention.

[0078] For example, in each of the above forms, each example, or its modification example, the value obtained by dividing the calculated value Ti from the measured value Tr is conveniently referred to as the "restoration value". In the present invention, this restoration value means, for example, when it is made into a roll shape, the convex part of the single emboss enters the concave part, and then when it is pulled out from the roll and used as a single sheet, Tr > Ti, that is, it includes the apparent restoration.

Explanation of Signs

[0079] 1, 1', 1'' Kitchen paper 10, 10’, 10’’ Kitchen paper rolls 11 Surface sheet (first layer) 11e, 11’e, 11’’e First embossed part 11p First embossed convex part 11r First embossed concave part 12 Back sheet (second layer) 12e, 12’e, 12’’e Second embossed part 12p Second embossed convex part 12r Second embossed concave part 13 Laminated continuous sheet 14 Paper tube 15 Adhesive part d Diameter of the paper tube C Rotation axis D Diameter of the kitchen paper roll G Gap L Roll length S Area occupied by the kitchen paper Tr Measured value of the paper thickness of the kitchen paper Ti Calculated value of the paper thickness of the kitchen paper

Claims

1. A kitchen paper roll in which the kitchen paper is in a roll shape, wherein when the measured value of the paper thickness of the kitchen paper is Tr, and in a cross-section perpendicular to the rotation axis of the kitchen paper roll, the area occupied by the kitchen paper is divided by the winding length of the kitchen paper wound around the kitchen paper roll to obtain a calculated value Ti, the restoration value obtained by dividing the measured value Tr by the calculated value Ti is 1.10 or more, the measured value Tr is 456 μm to 664 μm or less, the winding length of the kitchen paper wound around the kitchen paper roll is 20 m to 25 m, and the winding diameter of the kitchen paper roll is 109.4 mm to 115 mm, the tensile strength of the kitchen paper in the longitudinal direction when dry is 5.0 N to 13.0 N, and the tensile strength of the kitchen paper in the width direction when dry is 1.5 N to 4.5 N, the kitchen paper is provided with recesses by embossing, the depth of the recesses is 200 μm to 450 μm, characterized in that it is a kitchen paper roll.

2. The kitchen paper roll according to claim 1, characterized in that the restoration value is 1.15 or more.

3. The ratio of the area of the recesses per unit area of the kitchen paper is 3% to 50%, characterized in that it is the kitchen paper roll according to claim 1 or claim 2.

4. The outer contour of the depression of the recess formed in the kitchen paper has corners, characterized in that it is the kitchen paper roll according to any one of claims 1 to 3.

5. The outer contour of the depression of the recess formed in the kitchen paper is in the shape of a polygon, characterized in that it is the kitchen paper roll according to claim 4.

6. the kitchen paper has a first layer and a second layer, one surface of the first layer and one surface of the second layer are adhered via an adhesive portion, the recesses are respectively formed such that the depressions of the recesses are arranged on the other surface of the first layer and the other surface of the second layer, characterized in that it is the kitchen paper roll according to any one of claims 1 to 5.

7. On the one surface of the first layer, a first embossed convex portion is formed so as to correspond to the recess formed on the other surface of the first layer, On one surface of the second layer, a second embossed convex portion is formed so as to correspond to the concave portion formed on the other surface of the second layer. The top of the first embossed convex portion and the surface of the one surface of the second layer that has not been embossed are adhered via the adhesive portion, and the top of the second embossed convex portion and the surface of the one surface of the first layer that has not been embossed are adhered via the adhesive portion. The kitchen paper roll according to claim 6, characterized in that.

8. The kitchen paper roll according to any one of claims 1 to 7, characterized in that the weight of the kitchen paper roll is 150 g to 320 g.

9. Kitchen paper that can be pulled out and used from the kitchen paper roll according to any one of claims 1 to 8.

Images