JP2005287725A - Rolled sanitary thin paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide rolled sanitary thin paper having an appropriate cushion property, thickness, softness and smoothness, even after being rolled into a roll state, having embossment scarcely crushed and, even in using it, non-losing the bulkiness, flexibility, and cushion property. <P>SOLUTION: This rolled sanitary thin paper 1 is formed by sticking two paper sheets 2 and 3 embossed respectively and rolling them into a roll. This rolled sanitary paper 1 has a roll density of 80-110 kg/m<SP>3</SP>and a value of paper thickness×roll length/roll cross section is 70-87 %. The rolled sanitary paper 1 has a winding density defined as a value obtained by dividing the winding length by the roll cross section is 0.28-0.36×10<SP>4</SP>m<SP>-1</SP>and the two paper sheets 2 and 3 are stuck by a nested method wherein a projecting part 2a of one side paper sheet 2 is stuck to a recess part 3a of the other side paper sheet 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to sanitary thin paper wound in a roll shape, such as toilet paper, which is particularly excellent in cushioning and thickness.

  For hygienic thin paper such as toilet paper and kitchen paper, paper sheets of 1-ply (1 ply) or 2-ply (2-ply) paper are used according to consumer requirements such as texture, ease of wiping and water absorption. Paper rolls that have been rolled up, and paper sheets that have been embossed in a concavo-convex shape to provide a soft and thick feeling are provided. In the case of the toilet paper, the product shape is usually about 60 m for 1 ply and about 30 m for 2 ply wrapped around a paper tube with an outer diameter of about 38 to 45 mm, and the outer diameter is about 110 mm. It is common.

In recent years, three or more sheets are stacked and rolled so as to improve the water absorption by utilizing the gap generated by stacking sheets in addition to the sheet's own water-absorbing power so as to be suitable for a warm water washing toilet seat. Toilet paper rolled in a shape (see Patent Document 1 below), a pair of paper sheets having an emboss pattern, joined together so that the convex surfaces of the emboss formed on each paper sheet face each other close together, A hygienic product of two or more plies integrated with a second embossing pattern different from the first embossing and having a large embossing depth on one of the pair of paper sheets (see Patent Document 2 below) is also proposed. ing.
JP 2002-172072 A Japanese Patent Laid-Open No. 2003-116741 JP-A-57-195430

  However, in the case of the toilet paper described in Patent Document 1, although it will give a soft touch with good water absorption, there is a lot of resource waste because the winding length is shortened and the amount of use at one time is increased. . In addition, if the number of plies is increased, it is a fact that the amount of water absorption increases. However, since the softness and softness are lost during use, and the feeling becomes hard and stiff, consumer satisfaction is not obtained.

  By the way, the consumer often decides to purchase after actually holding the toilet roll in his / her hand and confirming the touch. In the case of toilet paper that is too hard to feel, it may feel stiff during use and feel unusable, and if it is too soft, there may be concerns that tearing may occur during use.

  There is a tendency that embossing is effective in order to give a soft feeling and a thick feeling while hardening the winding, but toilet paper that is wound up in a roll shape etc. In some cases, the embossing disappears due to the winding pressure or the passage of time, and the embossing effect is not necessarily obtained. In the sanitary product described in Patent Document 2, the two paper sheets 50 and 51 are joined by the so-called Tip To Tip method (see FIG. 4) disclosed in Patent Document 3, so that the bulkiness and softness are felt. However, since this joining form makes the embossed convex portions face each other, there is a drawback that the emboss is easily crushed by pressure. Therefore, if the embossing is functioning, that is, the state where the embossing is not crushed and immediately after production before being wound on the paper tube, various characteristics such as bulkiness, sheet surface characteristics, flexibility and cushioning are satisfied. Although many of these sanitary thin papers are rolled up and shipped to the market, the embossing is flattened or disappears over time, and is used. At the time of unwinding, there were already problems such as loss of bulkiness, flexibility and cushion feeling.

  Then, the 1st subject of this invention is providing the roll-shaped sanitary thin paper which has a moderate cushion feeling and a feeling of thickness. Secondly, it has softness and smoothness, and even after being rolled up, the embossing is not easily crushed, and the bulkiness, flexibility, cushion feeling, etc. have disappeared even when used by consumers. There is no roll-like sanitary thin paper.

In order to solve the above-mentioned problem, as the present invention according to claim 1, in the roll-like sanitary thin paper in which two paper sheets each provided with embossing are bonded and wound into a roll shape,
The roll-like sanitary paper is provided with a roll-like sanitary thin paper having a roll density of 80 to 110 kg / m ³ and a value of paper thickness × winding length / roll cross-sectional area of 70 to 87%. Is done.

In the present invention according to the first aspect, a roll-like sanitary thin paper having a roll density of 80 to 110 kg / m ³ and a value of paper thickness × winding length / roll cross-sectional area of 70 to 87% is used. . By setting the values of the roll density and paper thickness × winding length / roll cross-sectional area within the above numerical range, it is possible to obtain a roll-like sanitary thin paper having an appropriate cushion feeling and thickness feeling.

According to a second aspect of the present invention, in the rolled sanitary paper, a winding density determined as a value obtained by dividing a winding length by a roll cross-sectional area is 0.56 to 0.72 × 10 ⁴ m ^−1. The rolled sanitary thin paper described is provided.

In the present invention according to the second aspect, the winding density is set to 0.56 to 0.72 × 10 ⁴ m ⁻¹ . By setting the winding density within the above numerical range, it is difficult to cause deformation while having a cushion feeling, a thickness feeling, and softness.

  According to a third aspect of the present invention, in the form of a roll according to any one of the first and second aspects, the two paper sheets have a convex portion of one paper sheet bonded to a concave portion of the other paper sheet. Sanitary tissue paper is provided.

  In the present invention described in claim 3, a laminate structure in which the convex portion of the paper sheet on one side is bonded to the concave portion of the paper sheet on the other side, that is, a bonding structure called “Nested system” is adopted. . Compared to the above TipToTip method, the nested method has significantly more strut portions (joint portions between the convex portions and the concave portions) that connect the paper sheets, and the embossing is less likely to be crushed even with winding pressure or time. Since the embossing is not easily crushed, the feeling of bulkiness, softness, and cushioning remains even during use. Moreover, since the degree of unevenness is small and the embossing is precisely defined, it feels smooth. Further, since the amount of water absorption can be improved by utilizing the gap formed between the two paper sheets, it can be suitably used, for example, for a warm water toilet seat.

  As the present invention according to claim 4, two or more types of embossments having different emboss depths are provided on both or one side of the two paper sheets. Tissue paper is provided.

  In the present invention described in claim 4, two or more types of embosses having different emboss depths are provided on both or one side of the paper sheet.

  In the invention described in claim 4, the emboss having a relatively deep emboss depth gives bulkiness, and the emboss having a relatively shallow emboss depth gives a feeling such as a touch feeling, a soft feeling, and a smooth feeling. It becomes like this.

  As for this invention which concerns on Claim 5, the 2nd embossing whose dimension and depth are smaller than the said embossing is provided to the paper sheet of the at least one side of the said two paper sheets. A roll-like sanitary thin paper as described above is provided.

  In the present invention described in claim 5, the second emboss having a small emboss size and depth is provided on at least one side of the paper sheet. Since the second emboss is not in contact with the base surface of the other paper sheet, it can give a high flexibility and a smooth feeling as a touch feeling.

  As the present invention according to claim 6, the paper sheet has a longitudinal (MD) tensile strength of 250 to 400 CN / 25 mm and a transverse (CD) tensile strength of 80 to 300 CN / 25 mm based on JIS P 8113. A roll-like sanitary thin paper according to any one of claims 1 to 5 is provided.

  In the present invention described in claim 6, the longitudinal (MD) tensile strength of the paper sheet based on JIS P 8113 is 250 to 400 CN / 25 mm, and the transverse (CD) tensile strength is 80 to 300 CN / 25 mm. It is. By setting the longitudinal tensile strength and the transverse tensile strength to be in the above numerical range, it is possible to make embossing that has softness, cushion feeling, thickness feeling and hardly collapses due to winding pressure or time. Become.

  According to a seventh aspect of the present invention, there is provided the roll-like sanitary thin paper according to any one of the first to sixth aspects, wherein the paper sheet has a water decomposability based on JIS P 4501 of 8 to 40 sec. It is desirable that the water disintegrability (easy to loosen) and the hygienic thin paper be within a general range, specifically 8 to 40 sec so as not to impede the function of the water distribution pipe or the like when the sanitary thin paper flows out of the flush toilet.

  The roll-like sanitary thin paper according to any one of claims 1 to 7 is provided as the present invention according to claim 8, wherein a viscosity of the adhesive for bonding the two paper sheets is 4 to 50 mps.

  In the present invention according to claim 8, the viscosity of the adhesive is 4 to 50 mps. When the adhesive viscosity is less than 4 mps, peeling occurs at the time of use, and when it exceeds 50 mps, an operation trouble such as paper winding around the coating roll occurs.

  As described above in detail, according to the present invention, it has an appropriate cushion feeling and thickness feeling, and additionally has softness and smoothness, and even after being wound into a roll, the embossing is not easily crushed, and the consumer's Even when in use, it can be a sanitary thin paper that does not lose bulkiness, flexibility, cushioning, and the like.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a roll-like sanitary thin paper 1 according to the present invention.

The roll-like sanitary thin paper 1 such as toilet paper according to the present invention is a sanitary thin paper in which two paper sheets 2 and 3 each having an uneven embossing are bonded to each other and wound around the paper tube 5 in a roll shape. In particular, in the present invention, the roll density is 80 to 110 kg / m ³ and the value of paper thickness × winding length / roll cross-sectional area is 70 to 87%. Here, the “winding length” refers to the length of the thin paper in the winding direction (longitudinal direction), and the “roll cross-sectional area” refers to the area S of the surface perpendicular to the central axis of the roll (paper tube and center). Excluding the space.) The paper thickness is measured under the conditions of JIS P8111 using an Ozaki dial thickness gauge “PEACOCK G type”. Specifically, confirm that there is no dust, dust, etc. between the plunger and the measuring table, lower the plunger on the measuring table, move the dial thickness gauge memory to adjust the zero point, then Raise the plunger, place the sample (paper sheet) on the test table, slowly lower the plunger and read the gauge at that time. At this time, only the plunger is placed. In addition, a measurement is performed with 2 sheets piled up, and it is set as an average value of 10 times.

The roll density (kg / m ³ ) represents the weight per unit volume in a state where the paper sheets 2 and 3 are wound around a roll, and the weight per unit of paper × (paper width) × winding length × number of stacked sheets / roll cross-sectional area × It is calculated by the formula of (paper width). This roll density is an index value of the winding hardness. That is, when the roll density is less than 80 kg / m ^3, it is not preferable because strong embossing that is not crushed is applied and smoothness is lost. On the other hand, when it exceeds 110 kg / m ³ , the cushion feeling and the soft feeling disappear, which is not preferable.

  The formula of paper thickness x winding length / roll cross-sectional area shows the value of unfolded volume (paper thickness x paper width x winding length) / rolled volume (roll cross-sectional area x paper width). This is an index value for (bulkyness). That is, when the value of the paper thickness × winding length / roll cross-sectional area is less than 70%, there are many voids and the roll is easily deformed, and when it exceeds 87%, the embossing is crushed. It is not preferable.

In the roll-like sanitary thin paper 1, the winding density determined as a value obtained by dividing the winding length by the roll cross-sectional area is preferably 0.56 to 0.72 × 10 ⁴ m ⁻¹ . When the winding density is in the above numerical range, it is difficult to cause deformation while having a feeling of cushion, a feeling of thickness, and softness. When the winding density is less than 0.56 × 10 ⁴ m ⁻¹ , the roll is deformed, and when it exceeds 0.72 × 10 ⁴ m ⁻¹ , the emboss is crushed. The winding density can be adjusted by adjusting the tensile force applied to the thin paper when winding the paper tube.

The embossing formed on the two paper sheets 2 and 3 is 3 to 8 pieces / cm ² , preferably 4 to 6 pieces / cm ² , and the diameter φ is 0.5 to 3 mm, preferably 1 to 2 mm. The depth h is 0.5 to 2 mm, preferably 0.5 to 1.5 mm.

  As the embossing method, for example, a method of applying embossing by pressing thin paper between a steel roll and a rubber roll to which an embossing pattern is applied, or a steel roll having a male embossing pattern and a female steel roll. Examples thereof include a method of applying embossing by applying pressure through a thin paper. Moreover, the said embossing can form a thing of various shapes with arbitrary arrangement | positioning patterns.

  As shown in FIG. 2, the two paper sheets 2 and 3 have an embossed convex portion 2a of one sheet 2 fitted into an embossed concave portion 3a of the other sheet 3, and a space H in the fitting region. The top of the embossed convex part 2 a and the bottom of the embossed concave part 3 a are adhered by an adhesive 4. As said adhesive agent, what does not have a hygiene problem, for example, carboxymethylcellulose or its salt, polyvinyl alcohol, or its salt, etc. can be used.

  The viscosity of the adhesive used to bond the paper sheets 2 and 3 is preferably 4 to 50 mps. When the viscosity is less than 4 mps, the adhesive strength is too weak and the sheet peels during use. Further, if it exceeds 50 mps, an operation trouble such as the sheet being wound around the pressure-sensitive adhesive application roll in the production line may occur, and the solidified adhesive may give the skin an uncomfortable feeling.

  The embossing pattern of the two paper sheets 2 and 3 is desirably provided with two or more types of embossing having different emboss depths on both or one side of the paper sheets 2 and 3. Embossing having a relatively deep embossing depth provides bulkiness, and embossing having a relatively small embossing depth provides a feeling of touch, flexibility, and smoothness.

  For example, the example shown in FIG. 3 is an example in which second embosses 2b and 3b having a size and depth smaller than the emboss (base emboss) are formed on both of the two paper sheets 2 and 3. Since the second embosses 2b and 3b are small embosses that are not in contact with the base surface of the other paper sheet 2 (3), they give a high flexibility and smoothness as a feeling of touch. The second embosses 2b and 3b may be formed only on one of the paper sheets 2 and 3.

  On the other hand, it is desirable that the paper sheets 2 and 3 have a longitudinal (MD) tensile strength of 250 to 400 CN / 25 mm and a transverse (CD) tensile strength of 80 to 300 CN / 25 mm based on JIS P 8113. By setting the longitudinal tensile strength and the transverse tensile strength to be in the above numerical range, it is possible to achieve embossing that does not easily collapse due to the winding pressure or the passage of time while having a feeling of cushion and thickness. Furthermore, when the sanitary thin paper has water decomposability such as toilet paper, the water decomposability based on JIS P 4501 is desirably 8 to 40 sec.

[Other examples]
(1) Although the roll type sanitary thin paper 1 of the core type has been described in the above embodiment, the present invention can be similarly applied to a coreless type in which the winding core is omitted.

  Hereinafter, the effects of the present invention will be clarified by examples. As shown in Table 1, US tsubo, paper thickness, tensile strength, water disintegration, winding length, winding diameter, paper tube diameter, embossing method, roll cross-sectional area, paper thickness / US tsubo, paper thickness x winding length / Manufacturing or obtaining eight types of toilet paper (2 types of examples and 6 types of comparative examples) with different roll cross-sectional area, winding density and roll density, and sensory evaluation of softness, smoothness, cushion / thickness Went. The sensory evaluation was made into a three-level evaluation of ○: excellent, Δ: normal, and X: inferior.

  As is apparent from Table 1, in the case of the toilet paper according to the present invention, it has been found that all of the softness, smoothness, and cushion / thickness are excellent.

  The present invention can be applied to sanitary thin paper such as kitchen paper as well as sanitary thin paper such as toilet paper.

1 is a perspective view of a roll-like sanitary thin paper 1 according to the present invention. 1 is a cross-sectional view of a sanitary thin paper 1. FIG. It is sectional drawing which shows the other emboss formation example of the sanitary thin paper 1. FIG. It is sectional drawing which shows the bonding cross-section concerning the conventional TipToTip system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Roll-like sanitary thin paper, 2.3 ... Paper sheet, 4 ... Adhesive, 5 ... Paper tube

Claims (8)

In a roll-like sanitary thin paper that has been rolled into a roll shape by bonding two paper sheets each embossed,
The roll-like sanitary paper is characterized in that the roll density is 80 to 110 kg / m ³ and the value of paper thickness × winding length / roll cross-sectional area is 70 to 87%. 2. The roll-like sanitary thin paper according to claim ¹ , wherein the roll-like sanitary paper has a winding density determined as a value obtained by dividing a roll length by a roll cross-sectional area of 0.56 to 0.72 × 10 ⁴ m ⁻¹ .   The roll-like sanitary thin paper according to any one of claims 1 and 2, wherein the two paper sheets have a convex portion of one paper sheet bonded to a concave portion of the other paper sheet.   The roll-like sanitary thin paper according to any one of claims 1 to 3, wherein two or more kinds of embosses having different emboss depths are provided on both or one side of the two paper sheets.   The roll-like sanitary thin paper according to any one of claims 1 to 3, wherein a second emboss having a size and a depth smaller than that of the emboss is provided on at least one of the two paper sheets.   The longitudinal direction (MD) tensile strength based on JIS P 8113 is 250-400 CN / 25mm, and the said paper sheet is transverse direction (CD) tensile strength 80-300CN / 25mm. Roll of sanitary thin paper.   The roll-like sanitary thin paper according to any one of claims 1 to 6, wherein the paper sheet has a water decomposability based on JIS P 4501 of 8 to 40 sec. The roll-like sanitary thin paper according to any one of claims 1 to 7, wherein the adhesive for bonding the two paper sheets has a viscosity of 4 to 50 mps.

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