JP2016182187A - Sanitary paper and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sanitary paper which has un-excessive firmness even if two-folded sheets each having 3 plies or more are superimposed while sandwiching each other sequentially in a rotary type inter holder and does not hinder smooth conveyance of the sheets in box packing, and to provide a manufacturing method of the sanitary paper.SOLUTION: In the sanitary paper, two folded sheets 12 formed by superimposing at least three pieces of thin paper on each other and two-folding the pieces of thin paper collectively are superimposed while sandwiching each other sequentially. A folding line L of the two-folded sheet is formed in a direction perpendicular to a paper-making direction of each thin paper. A ratio of tensile strength of the sheet along a direction perpendicular to the paper-making direction with respect to tensile strength of the sheet along the paper-making direction is in a range of 0.1-0.2. Flexure hysteresis by a KES of the sheet along the paper-making direction is in a range of 0.012 gf cm/cm-0.020 gf cm/cm.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sanitary paper in which at least three thin papers are overlapped with each other, and two fold sheets formed by folding the two at once are sandwiched in order, and a method for manufacturing the sanitary paper. .

  Many sanitary papers such as tissue paper and kitchen paper have a two-ply configuration in which a plurality of sheets, generally two thin papers, are stacked for the purpose of preventing moisture penetration and improving the texture. ing. In recent years, sanitary papers having a three-ply or four-ply structure in which three or more thin papers are superposed for the purpose of further improving the texture are commercially available as high-grade tissue cartons.

  Since the individual thin papers constituting the three-ply or four-ply tissue paper used in such high-grade tissue cartons need to have a smaller basis weight than that of the two-ply structure, the strength of the individual thin papers is reduced. For the purpose of maintenance, it is common to beat pulp fibers to make thin paper.

Japanese Patent Laid-Open No. 5-124770 JP 2012-34868 A

  In the tissue carton, individual tissue papers are folded in two, and the two folded tissue papers are sequentially stacked and packed in a box. In this case, if a three-ply or four-ply tissue paper in which three or more thin papers are stacked is folded in half using a rotary type inter-holder known in Cited Document 1 or Cited Document 2, The following problems arise.

  That is, when thin paper drawn from three or four original fabric rolls is fed into a rotary inter-holder, the rotary inter-holder uses individual tissue with three or four thin papers stacked on top of each other. Cut continuously to the dimensions of the paper. The cut tissue paper is folded in two in a direction perpendicular to the paper making direction, and the tissue paper to be folded next is sandwiched in order. As described above, in the tissue paper having a three-ply or four-ply structure obtained by paper-pulverizing pulp fiber, the restoring force to return to the original state when the tissue paper is folded in two is a tissue having a two-ply structure. It tends to be relatively larger than paper. Therefore, when they are stacked in a state where they are sandwiched in sequence, the edges of the tissue paper that should overlap each other do not align with each other, and the edges of some tissue paper are transported during transport for packaging and boxing. There is a risk of getting caught in the equipment and preventing normal transport. In addition, the tissue paper located at the top of the box may be caught by the open end of the box during boxing, and the tissue paper located at the top may be wrinkled, thereby reducing the commercial value.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sanitary paper capable of producing a tissue carton having a high commercial value that solves the above-mentioned problems that occur when boxing the above-described three-ply or four-ply tissue paper using a rotary inter-holder. There is to do. It is also included in the object of the present invention to provide a method capable of producing such a tissue carton.

  The first embodiment of the present invention is a sanitary paper in which at least three thin papers are superposed on each other, and two folded sheets formed by collectively folding the two sheets are sandwiched in order with each other. The folding line of the bi-fold sheet is formed in a direction perpendicular to the paper making direction of each thin paper, and in the paper making direction with respect to the tensile strength of the sheet along the paper making direction. The ratio of the tensile strength of the sheet along the direction perpendicular to the sheet is 0.2 or less, and the bending hysteresis (2HB) due to KES of the sheet along the paper making direction is from 0.012 gf · cm / cm to 0. It is characterized by being in the range of up to 0.020 gf · cm / cm.

  When the ratio of the tensile strength of the sheet along the direction perpendicular to the paper making direction to the tensile strength of the sheet along the paper making direction exceeds 0.2, the fold line is perpendicular to the paper making direction. When the sheet is folded in half so as to be formed, the restoring force to return to the original state tends to be relatively large. Similarly, when the bending hysteresis due to KES of the sheet along the paper making direction is less than 0.012 gf · cm / cm, the sheet is folded in two so that a folding line is formed in a direction perpendicular to the paper making direction. There is a tendency that the restoring force to return to the original state is relatively large. In any case, when two or more folded sheets are stacked in a state where they are sandwiched in order, the edges of the plurality of sheets that should overlap each other do not align with each other, and are transported for packaging and boxing There is a possibility that the edge of some sheets may be caught by the conveying device, and normal conveyance may not be possible. In addition, the sheet located at the uppermost part may be caught at the opening end of the box when packing, and the sheet may be wrinkled, which may reduce the commercial value.

  Conversely, when the bending hysteresis due to KES of the sheet along the paper making direction exceeds 0.020 gf · cm / cm, the sheet is folded in two so that a folding line is formed in a direction perpendicular to the paper making direction. The restoring force to return to the original state is almost lost. For this reason, when a plurality of two-folded sheets are stacked in a state where they are sandwiched in order, the sheet bundle is difficult to be bulky and inferior in the soft feeling.

  The second embodiment of the present invention is a state in which thin paper is pulled out from at least three thin paper rolls and supplied to a rotary inter-holder, and two folded sheets of at least three thin papers are sandwiched in order. The method comprises a step of feeding raw material containing pulp to a paper machine without beating, and a bi-fold sheet made of at least three thin papers made by a rotary inter-holder is Are folded so that a fold line is formed in a direction perpendicular to the papermaking direction of the thin paper constituting each of the sheets, and in the papermaking direction with respect to the tensile strength of the sheet along the papermaking direction. The ratio of the tensile strength of the sheet along the direction perpendicular to the sheet is 0.2 or less, and the sheet along the paper making direction is The bending hysteresis due to the KES of the sheet is in the range of 0.012 gf · cm / cm to 0.020 gf · cm / cm.

  In the present invention, the raw material containing pulp is supplied to the paper machine without passing through a refiner, beater, or other beater, while adjusting the ratio of the supply rate of the stock to the moving speed of the wire, that is, the J / W ratio. The ratio of the tensile strength of the sheet along the direction perpendicular to the papermaking direction to the tensile strength of the sheet along the papermaking direction is 0.2 or less, and the bending hysteresis due to KES of the sheet along the papermaking direction is 0. A thin paper is produced so as to be in the range of 0.012 gf · cm / cm to 0.020 gf · cm / cm to obtain an original roll of thin paper.

  In the sanitary paper according to the first aspect of the present invention and the method according to the second aspect, the ratio of the tensile strength of the sheet along the direction perpendicular to the papermaking direction to the tensile strength of the sheet along the papermaking direction. If is smaller than 0.1, it becomes difficult to maintain the strength required for sanitary paper. Therefore, it is preferable that the ratio of the tensile strength of the sheet along the direction orthogonal to the paper making direction to the tensile strength of the sheet along the paper making direction is 0.1 or more.

  According to the sanitary paper of the present invention, the edges of a plurality of sheets that should overlap each other are aligned with each other, avoiding the conventional problems that have occurred during transportation and boxing, and sufficiently bulky with a soft feeling Now, the two folded sheets can be overlapped with each other being sandwiched in order.

  According to the method of the present invention, since the raw material containing pulp is supplied to the paper machine without beating, the physical characteristics of the thin paper to be produced can be relatively easily within a predetermined range, and the sanitary paper according to the present invention can be obtained. It becomes possible to provide.

  When the ratio of the tensile strength of the sheet along the direction perpendicular to the paper making direction to the tensile strength of the sheet along the paper making direction is 0.1 or more, the strength required for sanitary paper is maintained. be able to.

It is a three-dimensional projection figure showing the external appearance of one Embodiment which applied the sanitary paper by this invention to the tissue carton in a partially broken state. In the embodiment shown in FIG. 1, it is a conceptual diagram which represents typically the overlapping state of a bi-fold sheet | seat. It is a three-dimensional projection figure which represents typically the external appearance of the one sheet | seat which comprises each bi-fold sheet | seat.

  Although an embodiment in which the present invention is applied to a tissue carton using tissue paper having a three-ply structure will be described in detail with reference to FIGS. 1 to 3, the present invention is not limited to such an embodiment. At least three or more thin papers are superposed on each other, and the two folded sheets formed by folding them together at a fold line perpendicular to the paper making direction are superposed in a state where they are sandwiched in order. It can be applied to sanitary paper and its manufacturing method.

  The appearance of the tissue carton in the present embodiment is partly broken and schematically shown in FIG. On the upper surface of the tissue carton 10 having a rectangular parallelepiped shape, a lid plate portion 10a that can be removed when the tissue carton 10 is used by using a perforation formed in an elongated frame shape in advance, and formed by removing the lid plate portion 10a. The opening 10b to be formed is formed. Moreover, the resin film 11 which covers this opening part 10b is joined beforehand from the inside of the tissue carton 10, and the tissue paper 12 is one by one from the tissue paper bundle 12 </ b> B accommodated in the tissue carton 10. A slit-shaped opening 11a is formed for taking out.

  The overlapping state of the tissue paper bundle 12B accommodated in the tissue carton 10 is schematically shown in FIG. 2, and a part thereof is extracted and enlarged and shown in FIG. In other words, each tissue paper 12 in the present embodiment is composed of three thin papers 12a, and the tissue paper bundle 12B is made using a rotary type inter-holder known in Patent Document 1, Patent Document 2, and the like. For this reason, each tissue paper 12 is in a state of being made along a direction perpendicular to the folding line L of the folded tissue paper 12.

  The three thin papers 12a constituting the tissue paper 12 are made of the tissue paper 12 along the direction perpendicular to the paper making direction with respect to the tensile strength of the tissue paper 12 along the paper making direction, that is, the arrangement direction of the pulp fibers. The ratio of tensile strength is in the range of 0.1 to 0.2, and the bending hysteresis (2HB) due to KES of tissue paper 12 along the paper making direction is 0.012 gf · cm / cm to 0.020 gf · cm /. Paper is made to a range up to cm.

  When the ratio of the tensile strength of the tissue paper 12 along the direction perpendicular to the paper making direction to the tensile strength of the tissue paper 12 along the paper making direction exceeds 0.2, the tissue paper 12 is folded in half. When this happens, the restoring force to return to the original state tends to be relatively large. Similarly, if the bending hysteresis due to KES of tissue paper 12 along the paper making direction is less than 0.012 gf · cm / cm, the restoring force to return to the original state when tissue paper 12 is folded in two is relatively Has a great tendency. In any case, when the folded tissue papers 12 are stacked in a state where they are sandwiched in order, the edges of the tissue paper bundles 12B that should overlap with each other are not aligned with each other, and are being transported for packaging or boxing. In addition, there is a possibility that the edge of some tissue paper 12 is caught by the conveying device, and normal conveyance may not be possible. In addition, the tissue paper 12 positioned at the uppermost part during boxing may be hooked on the opening end of the tissue carton 10 to cause wrinkles in the tissue paper 12 and reduce the commercial value.

  Therefore, it is effective that the ratio of the tensile strength of the tissue paper 12 along the direction orthogonal to the paper making direction to the tensile strength of the tissue paper 12 along the paper making direction is 0.2 or less. Similarly, it is effective that the bending hysteresis due to KES of the tissue paper 12 along the paper making direction is 0.012 gf · cm / cm or more.

  However, if the ratio of the tensile strength of the tissue paper 12 along the direction perpendicular to the paper making direction to the tensile strength of the tissue paper 12 along the paper making direction is less than 0.1, it is required as sanitary paper. The practicality is almost lost due to insufficient strength. Accordingly, the ratio of the tensile strength of the tissue paper 12 along the direction orthogonal to the paper making direction to the tensile strength of the tissue paper 12 along the paper making direction is in the range from 0.1 to 0.2. It is particularly preferred.

  Also, if the bending hysteresis due to KES of the tissue paper 12 along the paper making direction exceeds 0.020 gf · cm / cm, the restoring force to return the tissue paper 12 to its original state is almost lost when the tissue paper 12 is folded in half. . For this reason, when the two-fold tissue papers 12 are stacked in a state where they are sandwiched in order, the tissue paper 12 is less likely to be bulky and has a soft feeling. Therefore, the bending hysteresis due to KES of the tissue paper 12 along the paper making direction is particularly preferably in the range of 0.012 gf · cm / cm to 0.020 gf · cm / cm.

  The thin paper 12a that can be the tissue paper 12 having such physical characteristics can be easily manufactured by papermaking without beating the pulp fiber. That is, if the thin paper 12a is made without beating the pulp fibers, the longitudinal direction of the pulp fibers is easily arranged along the paper making direction of the thin paper 12a, and the entanglement between the pulp fibers is reduced. As a result, the strength of the thin paper 12a obtained However, it tends to be lower than when pulp paper is pulverized. However, in the present invention, the tissue paper 12 having a configuration of 3 plies or more can ensure the necessary strength as the tissue paper 12 even when pulp fibers that do not beat the pulp fibers are used. is there.

  It is also possible to add a moisturizing component to the tissue paper 12. Such moisturizing components include polysiloxanes such as silicone oil and silicone powder, polyhydric alcohols such as glycerin and propylene glycol, saccharides such as sorbitol and glucose, higher alcohols such as cetanol and oleyl alcohol, liquid paraffin and glycol solvents. And derivatives thereof can be generally used, but are not limited thereto. These moisturizing components can be added at the time of papermaking or production of a raw roll depending on the characteristics.

  It should be noted that the present invention should be construed only from the matters described in the claims, and in the above-described embodiment, all the changes and modifications included in the concept of the present invention are other than those described. Is possible. That is, all matters in the above-described embodiments are not intended to limit the present invention, and can be arbitrarily changed according to its use, purpose, and the like, including configurations not directly related to the present invention. Is.

DESCRIPTION OF SYMBOLS 10 Tissue carton 10a Cover plate part 10b Opening part 11 Resin film 11a Slit-like opening part 12 Tissue paper 12a Thin paper 12B Tissue paper bundle L Folding line

Claims (4)

A sanitary paper in which at least three thin papers are overlapped with each other, and the two folded sheets formed by folding these two in a lump are sandwiched in sequence with each other,
The folding line of the folded sheet is formed in a direction perpendicular to the paper making direction of the individual thin paper,
The ratio of the tensile strength of the sheet along the direction perpendicular to the papermaking direction to the tensile strength of the sheet along the papermaking direction is 0.2 or less,
A sanitary paper, wherein a bending hysteresis due to KES of the sheet along the paper making direction is in a range of 0.012 gf · cm / cm to 0.020 gf · cm / cm.   The ratio of the tensile strength of the sheet along the direction orthogonal to the paper making direction to the tensile strength of the sheet along the paper making direction is 0.1 or more. Sanitary paper as described in 1. Each of the thin papers is pulled out from at least three thin paper rolls and supplied to the rotary inter-holder, and the bi-fold sheets of at least three thin papers are sequentially stacked and overlapped with each other.
A bi-fold sheet consisting of at least three thin sheets made of a rotary inter-holder is provided with a step of supplying pulp-containing raw materials to a paper machine without beating, and the thin sheets that constitute the bi-fold sheets respectively. Folded in a direction perpendicular to the papermaking direction,
The ratio of the tensile strength of the sheet along the direction perpendicular to the papermaking direction to the tensile strength of the sheet along the papermaking direction is 0.2 or less,
Bending hysteresis due to KES of the sheet along the paper making direction is in the range of 0.012 gf · cm / cm to 0.020 gf · cm / cm.   The ratio of the tensile strength of the sheet along the direction orthogonal to the paper making direction to the tensile strength of the sheet along the paper making direction is 0.1 or more. The method described in 1.