JP4593059B2 - Laminate sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a laminate sheet obtained by bonding two base paper sheets.
[0002]
[Prior art]
In general, paper sheet products such as tissue paper, toilet paper, kitchen paper, and decorative paper, as shown in the longitudinal sectional view of FIG. It is provided to the consumer in the form of a laminate sheet 1 bonded to the substrate. And the main use of these laminate sheets 1 is to wipe off liquid and the like, and its bulkiness and liquid absorption are particularly required for its quality. Therefore, the base paper sheets 11 and 21 of the laminate sheet 1 are usually embossed to define a space S between the base paper sheets 11 and 21 that are bonded together, and thus have high bulkiness and liquid absorption. To increase.
[0003]
The form of the laminate sheet 1 is roughly classified into two types, “Tip to Tip” and “Nested”, depending on how the base paper sheets 11 and 21 on which the embossed convex portions 13 and 23 are formed are bonded to each other. Among these, “Tip to Tip” is an adhesive at the abutting position between the top of the embossed convex portion 13 of one base paper sheet 11 and the top of the embossed convex portion 23 of the other base paper sheet 21. A large space S can be defined between the embossed concave portions 15 and 25 located around the embossed convex portions 13 and 23, and is generally bulky and excellent in liquid absorption.
[0004]
[Problems to be solved by the invention]
However, as shown in FIG. 7 (b), when a pressing force F is applied perpendicularly to the surface of the laminate sheet 1, the space S is easily crushed, the liquid absorbency is impaired, and the embossed pattern is unclear. As a result, the laminate sheet 1 has a bad appearance. In general, the pressing force F is often applied at the final stage of the manufacturing process of the laminate sheet 1. That is, at the stage after bonding the two base paper sheets 11 and 21 on which the embossed convex portions 13 and 23 are formed, the laminate sheet 1 is wound up in a roll shape by a take-up reel. Due to the take-up tension or the like, the wound-up laminate sheet 1 is wound up. That is, the laminate sheet 1 wound inward is given a pressing force F in a direction perpendicular to the sheet 1 surface from the laminate sheet 1 wound outward. When the pressing force F is large, the space S between the embossed recesses 15 and 25 facing each other is crushed as shown in FIG. 7B.
[0005]
The present invention has been made in view of such a conventional problem, and two base paper sheets on which a plurality of first embossed convex portions corresponding to each other are formed are overlapped with each other at a position where the first embossed convex portions are brought into contact with each other. An object of the present invention is to provide a laminate sheet that adheres to each other, and in which a space between embossed concave portions facing each other is not easily crushed.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, the invention shown in claim 1 is configured such that two base paper sheets formed with a plurality of first embossed convex portions corresponding to each other are overlapped with each other at the butted position. In the laminated sheet to be bonded, a second embossed protrusion projecting toward the embossed recess of the facing base paper sheet is formed in the embossed recess that is a part around the first embossed convex part. The portion is formed on one of the two base paper sheets and the other base paper sheet, and the height of the second embossed convex portion is higher than that of the first embossed convex portion. It is characterized by.
According to the above invention, even if a pressing force in a direction perpendicular to the sheet surface acts on the laminate sheet, the other embossed paper sheet on which the second embossed convex part formed in the embossed concave part of one of the original paper sheets faces is provided. It is possible to hold the space defined between the embossed recesses by abutting against the embossed recesses and resisting the pressing force.
In addition, since the height of the second embossed convex portion is higher than that of the first embossed convex portion, the second embossed convex portion comes into contact with the embossed concave portion facing each other before the space is largely crushed. , Effectively prevents the collapse of the space.
[0009]
Invention shown in claim 2 is the laminated sheet according to claim 1, wherein the laminate sheet and the embossed area where the first embossing protrusions more, which are arranged at predetermined intervals, situated between the embossed area And a first embossed convex part, and the second embossed convex part is formed in the extracted pattern area.
According to the said invention, the said laminate sheet can express a design with an embossing area | region and a punching pattern area | region, and is excellent in the designability. Further, since the liquid easily passes through the punched pattern region, the liquid easily diffuses over the entire surface of the laminate sheet.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a kitchen paper is taken as an example of the laminate sheet of the reference example and the embodiment according to the present invention and will be described in the order of the following items.
(1) Laminate sheet (2) Laminate sheet manufacturing method (3) Plane arrangement example of second embossed convex part with respect to other planar arrangement of first embossed convex part
== (1) Laminate sheet ==
FIG. 1 is a conceptual diagram showing a laminate sheet of a reference example . FIG. 1 (a) is a plan view of a base paper sheet 11 on the front surface side, and FIG. 1 (b) is a plan view of a base paper sheet 21 on the back side. Each is shown. Moreover, in FIG.1 (c), the longitudinal cross-sectional view of CC arrow in FIG.1 (a) and (b) is shown.
[0013]
The kitchen paper which is the laminate sheet 1 according to this reference example is obtained by bonding two base paper sheets 11 and 21 made of pulp on which a plurality of first embossed convex portions 13 and 23 are formed, and the basis weight thereof. Is 10 to 60 g / m ² . In addition, a so-called “Tip to Tip” form is used as the bonding form, that is, the first base sheet 21 on the back side is firstly associated with the first embossed convex portion 13 of the base sheet 11 on the front side. While the embossed convex portion 23 is formed, the top portions of the first embossed convex portions 13 and 23 of the base paper sheets 11 and 21 are bonded together by an adhesive 31 at the abutting position.
[0014]
The shape of the first embossed convex portion 13 of the base paper sheet 11 on the front surface has a truncated quadrangular pyramid shape as if the head portion of the quadrangular pyramid is cut, and the top portion of the first embossed convex portion 13 becomes flat. ing. The flat top of the first embossed convex portion 23 of the same shape of the base paper sheet 21 on the back side faces the flat top, and these tops are bonded to each other by an adhesive 31 such as PVA. As a result, a space S sandwiched between the embossed recesses 15 and 25 is formed around the first embossed projections 13 and 23.
[0015]
The height H1 of the first embossed convex portions 13 and 23 is preferably 0.4 to 1.5 mm from the viewpoint of difficulty in crushing the convex portions 13 and 23. Further, the area A1 of the top part (see the hatched part in FIG. 1A) is preferably 1 to 10 mm ² from the viewpoint of adhesiveness and the difficulty of crushing the convex parts 13 and 23, and the convex part 13 , 23 is defined by an area A2 (refer to the shaded area in FIG. 1A) of 1.0 to 2. 5 times is desirable.
[0016]
In addition to PVA, CMC, MC, starch and the like can be used for the adhesive 31. Further, the shape of the first embossed convex portions 13 and 23 is not limited to a truncated quadrangular pyramid shape, and may be a truncated cone shape, a truncated triangular pyramid shape, a truncated polygonal pyramid shape, a rectangular parallelepiped shape, and the like. The top portion is preferably flat from the viewpoint of adhesiveness, that is, the first embossed convex portions 13 and 23 are preferably truncated.
[0017]
As shown in FIGS. 1A and 1B, the first embossed protrusions 13 and 23 cover the entire surface of the front-side base paper sheet 11 and the back-side base paper sheet 21. It is formed at equal intervals vertically and horizontally.
[0018]
Here, with respect to the base paper sheet 21 on the back surface side according to the present invention, in addition to the first embossed convex part 23, an embossed concave part 25 which is a part around the first embossed convex part 23 has a base paper sheet facing it. The 2nd embossing convex part 24 which protrudes toward 11 embossing recessed parts 15 is formed. Specifically, the second embossed convex part 24 is formed at the position of the midpoint of the line segment connecting the plane centers of the two adjacent first embossed convex parts 23, and from there, the surface side raw paper sheet It protrudes toward 11 embossed recesses 15.
[0019]
And according to the structure provided with this 2nd embossing convex part 24, even if the pushing force of the orthogonal | vertical direction with respect to the sheet | seat 1 surface acts on the laminate sheet 1, the 2nd embossing convex part 24 faces the embossing recessed part 15 which faces. The space S defined between the embossed recesses 15 and 25 can be maintained by resisting the pressing force. Therefore, the high bulkiness and liquid absorption of the laminate sheet 1 are maintained.
[0020]
The height H2 of the second embossing protrusions 24, in order to effectively exhibit the space holding the above-described effects, and high rot than the height H1 of the first embossing protrusions 13 and 23, good Mashiku Is preferably twice as high as H1. When the height H2 is twice the height H1, the embossed concave portion of the front side base paper sheet 11 facing the top of the second embossed convex portion 24 in a state where the space S is not crushed at all. 15, the space holding effect can be expressed most effectively.
[0021]
In addition, from the viewpoint of difficulty in crushing the second embossed convex portion 24, the area A3 of the top portion of the second embossed convex portion 24 (see the hatched portion in FIG. 1B) is 1 to 10 mm ² . It is desirable that the area A4 defined by the bottom of the convex portion 24 (see the hatched portion in FIG. 1B) is 1.0 to 2.5 times the area A3 of the top portion.
[0022]
The second embossed protrusions 24 need not be formed at all midpoint positions between the first embossed protrusions 23, and may be provided as necessary. For example, as shown in the plan view of FIG. 2A, the midpoint between the first embossed convex portion 23 that is the farthest adjacent one of the first embossed convex portions 23 that are adjacent to the periphery of the first embossed convex portion 23. It may be formed only at the position of, and not at the midpoint of the first embossed convex portion 23 that is closest to the first embossed convex portion 23, but may have a tooth-missing shape. Of course, the arrangement shown in the plan view of FIG.
[0023]
In the present embodiment, the second embossed convex portion 24 is formed on the base paper sheet 11 on the surface side in the planar arrangement shown in FIG. 2A, while the second embossed convex portion is formed in the planar arrangement shown in FIG. 24 is formed on the base paper sheet 21 on the back surface side, and these are bonded together so that the positions at which the second embossed protrusions 24 are missing are complemented .
[0024]
== (2) Manufacturing method of laminate sheet ==
Here, the manufacturing method of the laminate sheet 1 of a reference example is demonstrated. The base paper sheet manufactured through the pulping process and the paper making process is wound on a take-up reel at the end of the paper making process to become a base paper sheet roll. Here, the pulping step refers to a step of extracting the fiber (pulp) by boiling a wood piece or the like as a raw material with a cooking solution, and the paper making step is a pulp containing pulp extracted in the pulping step. It refers to the process of finishing a uniform and thin continuous sheet by pouring the solution over the wire part and making it.
[0025]
Next, two base paper sheet rolls 3 are carried into the line 51 of the bonding step shown in FIG. 3, and one of the base paper sheet rolls 3 is a front side base paper sheet and the other side is a back side base paper sheet. Each is unwound into a sheet state and bonded together to form the laminate sheet 1.
[0026]
The line 51 of the laminating process for performing the above operation includes a pair of upper and lower unwinding reels 53 and 53 for unwinding the two base paper sheet rolls 3 and 3 respectively, and the pair of upper and lower base paper sheets unwound. A pair of upper and lower embossing rolls 55 and 57 for processing and bonding the first embossed convex portions 13 and 23 to each other, and a laminate sheet 1 formed by bonding the two base paper sheets are wound up in a roll shape. And a take-up reel 59.
[0027]
The pair of upper and lower embossing rolls 55, 57 are steel rolls of the same diameter that are rotatably arranged with their circumferential surfaces facing each other in parallel, and the circumferential surfaces of the rolls 55, 57 are respectively In order to form the first embossed convex portion 13 on the front side base paper sheet and the first embossed convex portion 23 on the back side base paper sheet, a number of corresponding protrusions 55a and 57a are formed at the same height. . Then, when the two unwound base paper sheets pass through the inter-roll gap 56a, the base paper sheets are bonded to each other.
[0028]
Each base paper sheet is wound around the circumferential surface of each embossing roll 55, 57 over a predetermined range in the rotational direction before reaching the inter-roll gap 56a. Without the rotation, the embossing rolls 55 and 57 move to the inter-roll gap 56a. Between the winding start position 56b and the inter-roll gap 56a, pretreatment for bonding is performed on each base paper sheet.
[0029]
The preprocessing will be described in detail. For each of the upper and lower embossing rolls 55 and 57, an emboss formation position and a base paper sheet bonding position are set in order along the rotation direction for the preprocessing. ing. At the emboss formation position, the rubber roll 61 is arranged in parallel with its peripheral surfaces facing each other. The first embossed protrusions 13 and 23 are formed on the base paper sheet by narrowing the base paper sheet between the peripheral surface of the rubber roll 61 and the protrusions 55a and 57a of the embossing rolls 55 and 57. At the base paper sheet bonding position, as described above, the gap between the upper and lower embossing rolls 55, 57 is narrowed and pasted in a state where the two base paper sheets are overlapped. . At the time of this narrow pressure, the projections 55a and 57a formed on the peripheral surfaces of the upper and lower embossing rolls 55 and 57 are opposed to each other. The top portions of the first embossed convex portions 13 and 23 are bonded to each other.
[0030]
For the upper embossing roll 55, an adhesive application position for applying the adhesive 31 to the top of the first embossing convex portion 13 is set between the embossing position and the base paper sheet bonding position. Yes. At this adhesive application position, a rubber application roll 63 carrying the adhesive 31 on its peripheral surface is arranged with its peripheral surface facing each other, and the base paper is between the peripheral surface of the application roll 63 and the embossing roll 55. When the sheet passes, the peripheral surface of the coating roll 63 is selectively brought into contact only with the top of the first embossed convex portion 13, so that the adhesive 31 is applied only to the top. .
[0031]
Here, in the method for manufacturing the laminate sheet 1 of the present invention, the second embossed protrusion 24 is formed on the peripheral surface of the lower embossing roll 57 at a position between the protrusions 57a. A protrusion 57b is provided. The protrusions 57b are preferably formed at the same height as the protrusions 57a. In this way, the protrusion height of the lower embossing roll 57 can be engraved constant, and the embossing roll 57 can be easily manufactured. . Moreover, since the protrusion 57b for forming the 2nd embossing convex part 24 does not enter into the recessed part of the protrusions 55a of the embossing roll 55, even if the misalignment of the embossing convex part arises at the time of embossing, one embossing roll There is very little possibility that the end portion of the convex portion comes into contact with the end portion of the other embossing roll, which facilitates production. Needless to say, the arrangement pattern of the protrusions 57a and 57b is set in correspondence with the embossed protrusions 23 and 24 described above.
[0032]
Next, the laminate sheet 1 bonded at the inter-roll gap 56a is wound up in a roll shape by the take-up reel 59 and conveyed to the next step.
The wound laminate sheet 1 is subjected to a winding tightening force due to a normal winding tension or the like, and the space S formed between the embossed recesses 15 and 25 is thereby crushed. However, in the laminate sheet 1 of the present invention, since the second embossed convex part 24 is formed in the embossed concave part 25, the second embossed convex part 24 comes into contact with the embossed concave part 15 that faces the space. S can be held, so that the collapse of the space S can be suppressed.
[0033]
According to the above-described lower embossing roll 57 having the protrusions 57b having the same height as the protrusions 57a, when the embossing protrusions 23 and 24 are applied, the first embossing protrusions 23 formed on the base paper sheet The second embossed convex portion 24 has the same height, but when wound by the take-up reel 59, the height of the second embossed convex portion 24 becomes higher than the height of the first embossed convex portion 23. It becomes possible to effectively prevent the space S formed between the embossed recesses 15 and 25 from being crushed.
[0034]
In the subsequent steps, the laminate sheet 1 is wound into a roll after a perforation roll (perforation blade roll) is formed with perforations in the width direction at appropriate intervals in the longitudinal direction, and is wound into a roll. Or is cut at appropriate intervals in the longitudinal direction to become a single sheet product. Then, after being stored in the storage box, it is shipped.
[0035]
In addition, in description of the said manufacturing method, although the line 51 of the bonding process was provided separately from the said pulping process and papermaking process, it is not restricted to this, The line 51 of this bonding process is the said You may enable it to process continuously by making it continuous in a papermaking process.
[0036]
== (3) Example of Planar Arrangement of Second Embossed Protrusion to Other Planar Arrangement of First Embossed Protrusion ==
Here, an example of the planar arrangement of the second embossed convex portion with respect to another planar arrangement of the first embossed convex portion will be described.
A first example of the planar arrangement of the first embossed convex portion is shown in the plan view of the base paper sheet on the back side in FIG. The first embossed convex portion 23 (13) is arranged in a planar manner between the embossed region A1 formed with a large number of first embossed convex portions 23 (13) and the embossed region A1. The embossed convex portion 23 (13) is formed from a punched pattern region A2. The embossed area A1 and the cut pattern area A2 can express a predetermined design on the laminate sheet 1 to improve the design.
[0037]
The punched pattern area A2 has a regular quadrangular lattice shape, and the embossed area A1 located in the lattice has a square outline. And this embossing area | region A1 is comprised from the 49 1st embossing convex parts 23 (13) arrange | positioned at equal intervals. Here, in the present invention, the second embossed convex portion 24 is formed only in the pattern area A2 of the base paper sheet 21 on the back surface side. Specifically, a plurality of the second embossed convex portions 24 are arranged at a uniform pitch along the center line in the width direction of the pattern area A2.
[0038]
And according to this structure provided with the 2nd embossing convex part 24, it forms between the part of the pattern area A2 of the base paper sheet 11 of the surface side, and the part of the pattern area A2 of the base paper sheet 21 of the back side. The space S can be held by the second embossed convex portion 24.
[0039]
It should be noted that the second embossed convex part 24 may be arranged with respect to the front side base paper sheet 11 as long as it does not overlap the second embossed convex part 24 of the back side base paper sheet 21, that is, the back side. The base paper sheet 21 and the front side base paper sheet 11 may be alternately arranged along the center line.
The contour of the embossed area A1 is not limited to a square, but may be a rectangle, a circle, an ellipse, or the like.
[0040]
The 2nd example of planar arrangement | positioning of a 1st embossing convex part is shown in the top view of the base paper sheet of the back surface side of FIG. In this planar arrangement example, the first embossed convex portions 23 (13) are arranged in alignment on the surface of the sheet 21 to draw a line-like drawn line as a whole. In this illustrated example, the row 23a (13a) of the first embossed convex portion 23 (13) has a sine curve, and the plurality of rows 23a (13a) are formed with each other's crest and crest, and The sheet is set in a predetermined direction of the sheet 1 so that the valleys are opposed to each other, that is, the phases of the sine curves are aligned. And the 2nd embossing convex part 24 is formed between the peak parts of the row | line | column 23a (13a) of the sine curve which mutually opposes, and between trough parts. The second embossed convex portion 24 is formed in a truncated cone shape.
[0041]
FIG. 6 is a plan view showing a third example of the planar arrangement of the first embossed protrusions, where FIG. 6 (a) shows the front side base paper sheet and FIG. 6 (b) shows the back side base paper sheet. Respectively.
[0042]
The first embossed convex portions 13 and 23 indicated by white ovals in FIG. 6 are formed in a truncated elliptical cone shape, and a large number of the first embossed convex portions 13 and 23 are formed over the entire surface of both the base paper sheets 11 and 21 on the front side and the back side. It is arranged to draw a arabesque pattern as a whole. In addition, in the base paper sheet 21 on the back surface side, in addition to these drawn lines, a second embossed convex portion 24 indicated by a black ellipse is arranged between adjacent drawn lines. The drawn line drawn by the convex part 24 is a line-like drawn line filling the space between the drawn lines drawn by the first embossed convex part 23.
[0043]
As mentioned above, although embodiment which concerns on this invention was described, this invention is not limited to this embodiment, The deformation | transformation as shown below is possible in the range which does not deviate from the summary.
In the present embodiment, the kitchen paper is described as an example of the laminate sheet. However, the laminate sheet is not limited to this as long as it is a so-called “Tip to Tip” laminate sheet, and it is also applicable to tissue paper, toilet paper, and decorative paper. Applicable.
[0044]
【The invention's effect】
As described above, according to the present invention, two base paper sheets on which a plurality of first embossed convex portions corresponding to each other are formed are bonded by overlapping the first embossed convex portions at a butting position. It is a sheet | seat, Comprising: The laminated sheet with which the space between the embossing recessed parts which mutually face is hard to be crushed can be provided.
[Brief description of the drawings]
FIG. 1 (a) is a conceptual diagram showing a laminate sheet according to the present invention, FIG. 1 (a) is a plan view of a base paper sheet on its front side, and FIG. 1 (b) is its rear side. A plan view of the base paper sheet is shown, and FIG. 1 (c) shows a longitudinal sectional view taken along line CC in FIGS. 1 (a) and 1 (b).
FIGS. 2A and 2B are plan views of a base paper sheet on the front surface side and the back surface side for explaining an arrangement example of the second embossed convex portions of the embodiment according to the present invention.
FIG. 3 is a schematic side view of a bonding process line according to a laminate sheet of a reference example of the present invention.
FIG. 4 is a plan view of a base paper sheet on the back surface side for explaining an arrangement example of first and second embossed convex portions according to the present invention.
FIG. 5 is a plan view of a base paper sheet on the back surface side for explaining a planar arrangement example of first and second embossed convex portions according to the present invention.
FIG. 6 is a plan view of a base paper sheet for explaining a planar arrangement example of first and second embossed convex portions according to the present invention.
FIG. 7 is a longitudinal sectional view of a conventional “Tip to Tip” laminate sheet.
[Explanation of symbols]
1 Laminate sheet 11 Base side paper sheet (base paper sheet)
21 Back side base paper sheet (base paper sheet)
13, 23 First embossed convex portion 15, 25 Embossed concave portion 24 Second embossed convex portion 31 Adhesive S space

Claims (2)

In a laminate sheet in which a plurality of base paper sheets on which a plurality of first embossed convex portions corresponding to each other are formed and the first embossed convex portions are overlapped and bonded to each other at a butting position,
In the embossed concave portion that is a portion around the first embossed convex portion, a second embossed convex portion that protrudes toward the embossed concave portion of the facing base paper sheet is formed,
The second embossed convex portion is formed on both one base paper sheet and the other base paper sheet of the two base paper sheets,
The laminate sheet , wherein the height of the second embossed convex portion is higher than that of the first embossed convex portion . The laminate sheet has an embossed region in which a plurality of first embossed convex portions are arranged at a predetermined interval, and a cutout region in which the first embossed convex portions are not arranged between the embossed regions, laminate sheet according to claim 1, characterized in that the the punching handle region second embossing protrusions are formed.

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