JPH06155641A - Folding method of paper sheet - Google Patents

Abstract

PURPOSE:To provide a method for folding a paper sheet having embossed pattern and excellent bulkiness of the paper sheet after it is folded, with which bulkiness of quantity of contents after it is wrapped can be kept constant. CONSTITUTION:In a method for folding a paper sheet 1 having embossed pattern, the paper sheet 1 having embossed pattern where a protrusion 2 and a recess 3 on one face are formed so as to respectively correspond to a recess 3 and a protrusion 2 on the opposite face is to be folded along a line which makes the protrusion 2 and the recess 3 of the embossed pattern asymmetric or along its parallel line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for folding a paper sheet, and more particularly to a method for folding a paper sheet having an embossed pattern of three-dimensional unevenness.

[0002]

2. Description of the Related Art It is generally well known that embossing a paper sheet gives the sheet a bulkiness. This bulkiness is one of the particularly important properties in the manufacture of paper sheets, as it is related to the softness and absorbency of the consumer when using it. Further, the bulkiness of a paper sheet is important not only for the feel of each sheet, but also for the packaging of products. In the case of paper sheets, the product is packaged by folding a single sheet several times and stacking a predetermined number of sheets. There is also a method in which the material is wound into a roll and packaged. The packaging includes cartons, pillows, containers, etc., but it is desirable to maintain the stacking height of a predetermined number of sheets or the winding diameter as much as possible with respect to the packaging size.

By the way, there are the following several methods for applying an embossed pattern to a paper sheet. one,
This is a method of embossing by passing it between a rubber roll and a steel embossing roll. Also, each sheet of the two layers is separately embossed by passing between a rubber roll and a steel embossing roll, and an adhesive is applied to the convex portion of one sheet using a roller, and one sheet is There is a method of combining two layers so that the convex portion of the sheet is attached to the convex portion of the other sheet to give bulkiness. Further, there is a method of performing embossing with an embossing roll in which each set of embossing rolls is made of steel and a pattern is engraved so that the convex portion of one roll corresponds to the concave portion of the other roll.

[0004]

However, there is a problem in the bulkiness of the paper sheet manufactured in this way. For example, although the method using the rubber roll and the steel embossing roll is simple, there are cases in which a difference in pattern occurs between the front and back of the paper sheet, and bulkiness hardly occurs. Also, the two-layer combined paper sheet was cumbersome in that it required two rubber / steel nips in its manufacturing process and a roller-type adhesive applicator. Furthermore, with a paper sheet made of a roll having an uneven portion made of steel, there is no front and back, and a high bulky paper sheet is obtained, but when the paper sheet is folded, the convex portion of the embossed pattern overlaps the concave portion, There is a problem that the bulkiness of the paper sheet after folding is reduced. Also,
If one convex part of the embossed paper sheet overlaps the other convex part, the bulk of the folded paper sheet is high, and if one convex part overlaps the other concave part, There is a problem in that the volume of the folded paper sheet becomes low, and the volume of the product after the stacking varies. The purpose of the present invention is to
An object of the present invention is to provide a method for folding a paper sheet having an embossed pattern, which is excellent in the bulkiness of the paper sheet after being folded and can keep the bulkiness of the inner volume after packaging constant.

[Means for Solving the Problems] The inventors of the present invention have completed the present invention as a result of intensive research to achieve the above-mentioned object. That is, the folding method of a paper sheet having an embossed pattern of the present invention is a paper having an embossed pattern in which convex portions and concave portions on one surface are formed corresponding to concave portions and convex portions on the opposite surface. It is characterized in that the sheet is folded along a line in which a convex portion and a concave portion of the embossed pattern are asymmetrical or a parallel line thereof. When the above-mentioned paper sheet is folded along an asymmetrical line or its parallel line, the convex portion of the embossed pattern does not completely overlap the concave portion of the pattern, and the bulkiness of the sheet after folding is not lowered, and the sheet becomes bulky. Little change in volume due to variations.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a plan view of the paper sheet according to this embodiment, FIG. 2 is a cross-sectional view taken along the line AA or BB of the paper sheet of FIG. 1, and FIG. FIG. 4 is a plan view of the paper sheet rotated by 45 °, and FIG.
5 is a process chart of forming an embossed pattern on the paper sheet of FIG.
[Fig. 5] is a main part explanatory view of an embossing roll portion in the step of Fig. 4. As shown in FIGS. 1 and 2, a paper sheet 1 having an embossed pattern used in the folding method of the present embodiment.
Is the convex portion 2 and the concave portion 3 of the one surface 1A, and the opposite surface 1B
1 has an embossed pattern formed corresponding to each of the concave portion 3 and the convex portion 2. In the folding method according to the present embodiment, the paper sheet 1 is formed by a line in which the convex portion 2 and the concave portion 3 of the embossed pattern are asymmetrical (line C-C and line D-D in FIG. 1) or their parallel lines. (EE line and F- line in FIG. 3)
It is characterized by folding along the line (F).

To explain this embodiment in more detail, a paper sheet 1 having an embossed pattern as shown in FIG. 1 is alternately passed through convex portions 2 and concave portions 3 of the embossed pattern to form convex portions 2 and concave portions. Lines that are symmetric with respect to 3, that is, lines A-A and B-
When folding is performed with respect to a line parallel to B (symmetrical lines orthogonal to each other), the folding positions may be in phase, and the convex portion 2 of the pattern may completely overlap the concave portion 3. As a result, the paper sheet after being folded several times has a very low bulk and becomes uneven.

On the other hand, a line in which the convex portion 2 and the concave portion 3 of the embossed pattern are asymmetrical, for example, line segments C-C and D-
When folded along a line parallel to D, the pattern of the convex portion 2 and the pattern of the concave portion 3 always deviate, the convex portion 2 does not overlap the concave portion 3, and the volume is not reduced and is stable. This will be described in more detail with reference to FIG. 3, where line D-D and line D-
When folded along a line E-E parallel to D, there may be only the convex portion 2 on a line orthogonal to these lines,
The convex portions 2 of the pattern overlap each other, and the bulkiness is maintained. Also, when folded along the line FF, when the length b between patterns is smaller than the width dimension a of the pattern,
The convex portions 2 overlap with each other and the bulkiness can be maintained. When a <b, the convex portions 2 do not overlap with each other, but the convex portions 2 do not fall into the concave portions 3 and a large reduction in volume does not occur. . This is also the case when folded perpendicular to the line D-D.

In the above-mentioned paper sheet 1, as shown in FIG. 3, the convex portion 2 and the concave portion 3 have a square pattern. However, the embossed pattern and the folding method of FIG. 3 are merely examples of the present invention, and are not limited thereto. For example, each embossed pattern may be a rectangle, a hexagonal shape, a circle, an ellipse, or the like, and is not particularly limited as long as it can be engraved. It is preferable that the pattern of the convex portion 2 and the pattern of the concave portion 3 have the same shape. Further, in the above-described embodiment, the embossed paper sheet 1 is not limited to one layer, and may be formed in a plurality of layers.

Next, an example of an apparatus for carrying out the present invention will be described with reference to the schematic view of FIG. An embossed sheet of paper 1'consisting of one or more layers is unwound from an unwinding section 10 and is made of steel on both sides, and a pattern is engraved so that the convex portion of one roll corresponds to the concave portion of the other roll. The paper sheet 1 ′ is delivered to the rolls 11 and 12. At this time, the embossed pattern is engraved so that a line in which the convex portion 2 and the concave portion 3 of the pattern are asymmetric is in the flow direction, for example, line segment D-D in FIG. This embossing roll 11,1
The paper sheet 1 ′ fed into 2 is then given the necessary embossed pattern on the paper sheet, and as a result, as a paper sheet 1 having an uneven pattern as shown in FIG. It is sent out and wound up, or the flow direction (Fig. 3
(D-D line direction) and several times in a direction perpendicular to the flow direction, and accumulated into a predetermined number of sheets to be commercialized. At this time, the embossing rolls 11 and 12 may be at room temperature or may be heated. As a result, it becomes a particularly simple method for winding or supplying a bulky paper sheet with a constant bulkiness.

[0010]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples. For evaluation, the thickness of one paper sheet, the thickness after four paper sheets were folded, and the height after twelve paper sheets were stacked and 12 sheets were stacked were measured, and the results are summarized in Table 1. Example 1 The individual embossed patterns of the convex portion and the concave portion are squares as shown in FIG. 3, and the folding direction is 45 with respect to the symmetry line of the pattern.
Direction (° D-D line in FIG. 3) and the pattern size is a =
2.8 mm and b = 1.4 mm. The paper sheet was a 1-ply sheet with a 2-ply adhesive having a basis weight of 30 g / m ² . The processing conditions were emboss clearance of 0 mm and processing speed of 75 mm / min. Example 2 The individual embossed patterns of the convex portion and the concave portion are circular, the folding direction is 45 ° with respect to the symmetry line of the pattern, and the pattern dimensions are a = 2.0 mm and b = 1.9 mm. . The paper sheet was the same as in Example 1, and the processing conditions were the same as in Example 1.

Comparative Example 1 Each embossed pattern of a convex portion and a concave portion is a square,
The folding direction is to fold with respect to the line where the pattern is symmetrical. The pattern dimensions were a = 1.0 mm and b = 2.5 mm, and the paper sheet and processing conditions were the same as in Example 1 for processing. Comparative Example 2 The individual embossed patterns for the convex portion and the concave portion are circular, and are folded in the same direction as in Comparative Example 1. The pattern size is a =
The processing conditions were the same as in Example 1, with 1.0 mm and b = 2.5 mm.

[0012]

[Table 1]

[0013]

The method for folding a paper sheet having an embossed pattern according to the present invention is excellent in the bulkiness of the paper sheet after folding, which is a drawback of the conventional paper sheets, and makes the bulk content volume after packaging uniform. It can be maintained and stable products can be supplied.

[Brief description of drawings]

FIG. 1 is a plan view of a paper sheet used in a method for folding a paper sheet having an embossed pattern according to the present invention.

FIG. 2 is a cross-sectional view of the paper sheet of FIG. 1 taken along the line AA or the line BB.

FIG. 3 is a plan view of the paper sheet of FIG. 1 rotated by 45 °.

FIG. 4 is a process diagram of forming an embossed pattern on the paper sheet of FIG.

5 is an explanatory view of a main part of an embossing roll portion in the process of FIG.

[Explanation of symbols]

 1 Paper sheet 2 Convex part 3 Recessed part 11, 12 Steel embossing roll

Claims (3)

[Claims] 1. A paper sheet having an embossed pattern in which convex portions and concave portions on one surface are formed corresponding to concave portions and convex portions on the opposite surface, respectively. A method for folding a paper sheet, characterized by folding along a line whose portions are asymmetrical or a parallel line. 2. The method for folding a paper sheet according to claim 1, wherein the embossed pattern has the same convex portion and the same concave portion. 3. The embossed pattern is formed so that there are two symmetry lines that intersect each other and that pass through the convex portion and the concave portion alternately. Alternatively, the method of folding the paper sheet according to the second item.