JP2005168582A - Water soluble sanitary paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure a thick feeling and water absorbency, and at the same time, to suitably increase softness and smoothness. <P>SOLUTION: A toilet paper 100 is formed by superposing a front tissue 11 and a rear tissue 12. On the front tissue 11 and the rear tissue 12, a plurality of macro-embosses 4 and a plurality of micro-embosses 5 which have a smaller shape than the macro-embosses 4 are provided in a manner to enter a tissue 1 side being different from the other tissue 1. The macro-embosses 4 and the micro-embosses 5 which are provided on the front tissue 11 are arranged at locations being relatively shifted from the macro-embosses 4 and the micro-embosses 5 which are provided on the rear tissue 12. The micro-embosses 5 are arranged between the macro-embosses 4 which are provided on one tissue 1 and the macro-embosses 4 which are provided on the other tissue 1 among from the front tissue 11 and the rear tissue 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a water-decomposable sanitary paper such as toilet paper.

Traditionally, toilet paper has been known as a water-degradable sanitary paper, and since this toilet paper directly touches the skin, it has a sensory effect such as softness, softness, smoothness, and thickness. Excellent ones are required.
In addition to the above-mentioned functionality, functionality such as water absorption of toilet paper and the absence of moisture penetration has been required with the recent popularization of warm water washing toilet seats.

Therefore, one piece of toilet paper uses a softening agent and uses a technology that improves softness and thickness while maintaining softness by increasing the basis weight (for example, Patent Documents). 1).
In addition, some toilet paper in which two thin papers are stacked have a plurality of embossed surfaces on the surface of the thin paper (see, for example, Patent Document 2).
Furthermore, toilet paper has been developed that is adapted to a warm water-washed toilet seat by superimposing three or more thin paper sheets to improve water absorption (see, for example, Patent Document 3).
JP 7-189171 A Special Table 2003-526394 JP 2002-172072 A

However, in the case of Patent Document 1 and the like, even if the feeling of thickness is improved, water absorption sufficient for wiping off water after washing with warm water cannot be obtained, and a large amount of toilet paper must be used to complete wiping. did not become.
Furthermore, in the case of the above-mentioned Patent Document 2, etc., by providing embossing, it is possible to improve the sense of thickness and expand the surface area to improve water absorption. However, embossing is necessary for securing the toilet paper support force. There is a problem that the softness and smoothness decrease and the touch becomes worse as the number of the increases.
In addition, in the case of the above-described Patent Document 3 or the like, there is a problem that the cost increases due to an increase in the number of thin paper sheets to be stacked.

  The subject of this invention is providing the water-decomposable sanitary paper which can aim at the improvement of softness and smoothness suitably while ensuring a feeling of thickness and water absorption.

The invention according to claim 1 is a water-degradable sanitary paper in which at least two thin papers are stacked,
The front thin paper and the back thin paper constituting the front and back surfaces of the water-decomposable sanitary paper have a plurality of first embossed recesses and a plurality of smaller shapes than the first embossed recesses so as to enter the opposing thin paper side. A second embossed recess is provided,
The first embossed recess and the second embossed recess provided in the front thin paper are disposed at positions shifted relative to the first embossed recess and the second embossed recess provided in the back thin paper. And
Of the front thin paper and the back thin paper, the second embossed concave portion is disposed between the first embossed concave portion provided in one thin paper and the first embossed concave portion provided in the other thin paper. It is characterized by being.

According to the first aspect of the present invention, the first embossed recess provided in the front thin paper is disposed at a position relatively shifted from the first embossed recess provided in the back thin paper. Even if the number of the first embossed recesses is reduced compared to the water-degradable sanitary paper disposed oppositely, the first embossed recesses provide sufficient support to maintain the thickness of the hydrolyzable sanitary paper at a predetermined value. It is possible to ensure the thickness and water absorbency of the water-degradable sanitary paper appropriately. As a result, the number of first embossed recesses can be reduced, so that the smoothness of the water-decomposable sanitary paper can be improved, and the first embossing provided on one of the front thin paper and the back thin paper. The number of the 2nd embossing recessed parts arrange | positioned between a recessed part and the 1st embossing recessed part provided in the other thin paper can be increased. And since the 2nd embossing recessed part provided in a front thin paper is arrange | positioned in the position relatively shifted | deviated from the 2nd embossing recessed part provided in a back thin paper, it becomes that a water-degradable sanitary paper becomes easier to curve. Thus, the softness of the water-decomposable sanitary paper can be improved.
As described above, even if the water-degradable sanitary paper is formed by stacking at least two thin papers, the thickness and water absorbability of the water-decomposable sanitary paper are appropriately secured, and the softness and smoothness of the water-degradable sanitary paper are ensured. An improvement can be aimed at suitably.

The invention according to claim 2 is the water-decomposable sanitary paper according to claim 1,
A portion corresponding to one rotation of the production roll used for forming the first embossed recess in each of the front thin paper and the back thin paper has a bottom surface portion of the plurality of first embossed recesses with respect to the area of this portion. The first embossed recess is provided so that the ratio of the sum of the areas is less than 12.5%.

  According to the second aspect of the present invention, it is possible to obtain the same effect as the first aspect of the invention, particularly for use in forming the first embossed recess in each of the front thin paper and the back thin paper. In the portion corresponding to one rotation of the production roll, the ratio of the sum of the areas of the bottom surfaces of the plurality of first embossed recesses to the area of this portion is less than 12.5%. Since the concave portions are provided, the number of the second embossed concave portions can be appropriately increased by further reducing the number of the first embossed concave portions, and the softness and smoothness of the water-degradable sanitary paper can be achieved. Can improve the touch.

The invention according to claim 3 is the water-decomposable sanitary paper according to claim 1 or 2,
A portion of the front thin paper and the back thin paper corresponding to one rotation of the production roll used for forming the first embossed concave portion has a circumferential direction at a predetermined position of a side wall portion of the plurality of first embossed concave portions. The first embossed recess is provided so that the sum of the lengths is 35 mm / cm ² or more.

  Here, the predetermined position of the side wall portion of the first embossed recess is, for example, the outer peripheral portion of the bottom surface portion of the first embossed recess.

According to the third aspect of the present invention, the same effect as that of the first or second aspect of the present invention can be obtained, especially for the formation of the first embossed recess in the front thin paper and the back thin paper. In the portion corresponding to one rotation of the manufactured roll, the first length is set such that the sum of the circumferential lengths at predetermined positions of the side wall portions of the plurality of first embossed recesses is 35 mm / cm ² or more. Since the embossed recess is provided, it is possible to appropriately secure the supporting force for maintaining the thickness of the water-degradable sanitary paper at a predetermined value, and to ensure the sense of thickness of the water-degradable sanitary paper properly. .

The invention according to claim 4 is the water-degradable sanitary paper according to any one of claims 1 to 3,
The area of the bottom face of the second embossed recess is less than 1 mm ² .

According to the invention described in claim 4, it is a matter of course that the same effect as that of the invention described in claims 1 to 3 can be obtained. In particular, the area of the bottom surface of the second embossed recess is less than 1 mm ^2. Therefore, the softness of the water-decomposable sanitary paper can be improved more appropriately.

The invention according to claim 5 is the water-decomposable sanitary paper according to any one of claims 1 to 4,
A tensile strength [N / 25 mm] in the longitudinal direction of the water-degradable sanitary paper in a wet state is 0.35 to 0.8.

  Here, the measurement of the tensile strength is performed in a state in which the water-decomposable sanitary paper is wetted using a predetermined moisture applying means such as a brush, in accordance with a method according to JIS P8113 in the measurement of the dry tensile strength.

  According to the fifth aspect of the present invention, it is possible to obtain the same effect as the first to fourth aspects of the invention. In particular, the tensile strength in the longitudinal direction of the water-degradable sanitary paper in a wet state [N / 25 mm] is 0.35 to 0.8, it is possible to provide a water-decomposable sanitary paper in which paper strength in a wet state is appropriately secured.

The invention according to claim 6 is the water-decomposable sanitary paper according to any one of claims 1 to 5,
The basis weight of each thin paper is 13 to 25 g / m ² .

According to the invention described in claim 6, even if the basis weight of each thin paper is 13 to 25 g / m ² , the same effect as that of the invention described in claims 1 to 5 is obtained. be able to.

The invention according to claim 7 is the water-decomposable sanitary paper according to any one of claims 1 to 6,
The water-decomposable sanitary paper is a laminate of the front thin paper and the back thin paper,
The front thin paper and the back thin paper are characterized in that a bottom surface portion of the first embossed concave portion of at least one thin paper paper and a portion facing the bottom surface portion of the other thin paper paper are bonded with an adhesive.

  According to the invention described in claim 7, it is needless to say that the same effects as those of the invention described in claims 1 to 6 can be obtained. The thickness feeling and water absorption of sanitary paper can be improved more appropriately.

The invention according to claim 8 is the water-decomposable sanitary paper according to claim 7,
The adhesive is different in color from the thin paper.

  According to the invention described in claim 8, it is of course possible to obtain the same effect as that of the invention described in claim 7, and in particular, by designing the adhesive to have a color different from that of the thin paper, It can be made excellent. That is, since the freedom degree of arrangement | positioning of a 1st embossing recessed part can be improved, the bottom face part of a 1st embossing recessed part can be formed in patterns, such as a floral pattern, or a predetermined number of 1st embossing recessed parts can be predetermined. The design of the water-degradable sanitary paper can be improved by forming a figure and applying an adhesive to the first embossed concave part that forms the pattern or figure.

According to invention of Claim 1, even if it reduces the number of 1st embossing recessed parts compared with the water-decomposable sanitary paper in which embossing was opposingly arranged, the thickness of water-decomposable sanitary paper by the 1st embossing recessed part It is possible to sufficiently secure the supporting force for maintaining the water content at a predetermined value, and it is possible to appropriately ensure the sense of thickness and water absorption of the water-degradable sanitary paper. As a result, the number of first embossed recesses can be reduced, so that the smoothness of the water-decomposable sanitary paper can be improved, and the first embossing provided on one of the front thin paper and the back thin paper. The number of the 2nd embossing recessed parts arrange | positioned between a recessed part and the 1st embossing recessed part provided in the other thin paper can be increased. And since the 2nd embossing recessed part provided in a front thin paper is arrange | positioned in the position relatively shifted | deviated from the 2nd embossing recessed part provided in a back thin paper, it becomes that a water-degradable sanitary paper becomes easier to curve. Thus, the softness of the water-decomposable sanitary paper can be improved.
As described above, even if the water-degradable sanitary paper is formed by stacking at least two thin papers, the thickness and water absorbability of the water-decomposable sanitary paper are appropriately secured, and the softness and smoothness of the water-degradable sanitary paper are ensured. An improvement can be aimed at suitably.

  According to the second aspect of the invention, the number of the second embossed recesses can be appropriately increased by further reducing the number of the first embossed recesses, and the softness of the water-degradable sanitary paper. And the smoothness can be improved and the touch can be improved.

  According to the invention described in claim 3, it is possible to appropriately secure the supporting force for maintaining the thickness of the water-decomposable sanitary paper at a predetermined value, and appropriately ensure the thickness feeling of the water-degradable sanitary paper. Can do.

  According to the invention described in claim 4, the softness of the water-decomposable sanitary paper can be improved more appropriately.

  According to invention of Claim 5, the water-decomposable sanitary paper in which the paper strength in the wet state was ensured appropriately can be provided.

According to the invention described in claim 6, even if the basis weight of each thin paper is 13 to 25 g / m ² , the same effect as that of the invention described in claims 1 to 5 is obtained. be able to.

  According to the seventh aspect of the present invention, the thickness and water absorption of the water-degradable sanitary paper can be improved more appropriately by bonding the two thin paper sheets with the adhesive.

  According to invention of Claim 8, it can be set as the thing which was excellent in the design property of water-degradable sanitary paper. That is, since the freedom degree of arrangement | positioning of a 1st embossing recessed part can be improved, the bottom face part of a 1st embossing recessed part can be formed in patterns, such as a floral pattern, or a predetermined number of 1st embossing recessed parts can be predetermined. The design of the water-degradable sanitary paper can be improved by forming a figure and applying an adhesive to the first embossed concave part that forms the pattern or figure.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.
Here, FIG. 1 is a perspective view of the toilet paper illustrated as an embodiment to which the present invention is applied, and FIG. 2 is a plan view showing an enlarged main part of the toilet paper of FIG. FIG. 3 is a cross-sectional view of the main part of the toilet paper taken along line III-III in FIG. 2.

  As shown in FIGS. 1 to 3, a toilet paper (water-degradable sanitary paper) 100 is formed by laminating a front thin paper 11 constituting the surface of the toilet paper 100 and a back thin paper 12 constituting the back surface of the toilet paper 100. The roll core 3 is wound around a roll.

The basis weight of each thin paper 1 is preferably 13 to 25 g / m ² . The reason why the lower limit is defined as 13 g / m ² is that if it is less than 13 g / m ² , it is preferable from the viewpoint of improving the softness of the toilet paper 100, but the strength as the toilet paper 100 cannot be ensured properly. is there. Further, the upper limit was defined as 25 g / m ^2, when greater than 25 g / m ^2, too hard toilet paper 100, because the skin feel of toilet paper 100 is deteriorated.
Here, as a measuring method of basic weight, the method according to JIS P8124 etc. are mentioned, for example.

As shown in FIG. 2, each of the front thin paper 11 and the back thin paper 12 has a thin paper 1 side facing each thin paper 1, that is, in the case of the front thin paper 11, the back thin paper 12 side, and the back thin paper 12 In some cases, a plurality of macro embosses (first embossed recesses) 4 and a plurality of microembosses (second embossed recesses) 5 having a shape smaller than these macro embosses 4 are provided so as to enter the front thin paper 11 side. It has been.
In FIG. 2, the macro emboss 4 formed on the front thin paper 11 is indicated by a solid line, and the macro emboss 4 formed on the back thin paper 12 is indicated by a broken line.

  The macro embossing 4 is formed in a substantially truncated cone shape as shown in FIGS. 2 and 3, and further, as shown in FIG. 2, a predetermined number of macro embossing is provided on each of the front thin paper 11 and the back thin paper 12. 4 are arranged so that a predetermined pattern is formed. Specifically, the front thin paper 11 and the back thin paper 12 are combined with a predetermined number of macro embosses 4 arranged in a predetermined shape such as a substantially arc shape, a substantially circular shape, or a substantially linear shape, for example. Is formed. Thereby, the design property of the toilet paper 100 can be improved.

Further, as shown in FIG. 3, the macro emboss 4 is a macro provided on the other thin paper 1 between two macro embosses 4, 4 provided on one thin paper 1 of the front thin paper 11 and the back thin paper 12. The emboss 4 is formed so as to be positioned. That is, the plurality of macro embosses 4 are disposed at positions that are relatively displaced from the front thin paper 11 and the back thin paper 12.
Accordingly, even if the number of macro embosses 4 provided per predetermined area of each thin paper 1 is reduced with respect to the so-called “Tip to Tip” type toilet paper in which the embosses are arranged to face each other, the toilet paper The support force by the macro embossing 4 for maintaining the thickness of 100 at a predetermined value can be ensured appropriately. Furthermore, even when the toilet paper 100 is pressed by a user, the force applied to the toilet paper 100 can be more appropriately distributed.

  Further, in the macro embossing 4, the bottom surface portions 41 of the plurality of macro embossing 4 with respect to an area corresponding to one rotation of a manufacturing roll (not shown) used for forming the macro embossing 4 in each thin paper 1. The ratio of the sum of the areas is preferably less than 12.5%. The upper limit of 12.5% is defined as 12.5% or more because it is preferable from the viewpoint of ensuring the thickness of the toilet paper 100 and ensuring water absorption, but the smoothness of the toilet paper 100 is deteriorated. It is. Here, the lower limit is preferably 5%, and if it is less than 5%, the support of the toilet paper 100 by the macro emboss 4 is not sufficient, and the thickness of the toilet paper 100 is lowered. Thereby, the number of the micro embossing 4 can be increased appropriately by reducing the number of the macro embossing 4 more, and the softness and smoothness of the toilet paper 100 are improved and the touch is improved. be able to.

Further, a plurality of macro embosses 4 provided in a region corresponding to one rotation of a production roll (not shown) in the front thin paper 11 and the back thin paper 12 are outer peripheral portions of the bottom surface portions 41 of the macro embosses 4 ( The sum of the circumferential lengths of the predetermined positions of the side wall portions is preferably 35 mm / cm ² or more. The lower limit was defined as 35 mm / cm ² is below the 35 mm / cm ^2, to secure is preferred from the viewpoint of softness improvement in sensation thickness easily collapse too thin toilet paper 100 of toilet paper 100 This is because it is not enough. Here, the upper limit is preferably 70 mm / cm ^2, exceeds the 70 mm / cm ^2, because the toilet paper 100 is not realistic too hard. Thereby, it is possible to appropriately secure the support force for maintaining the thickness of the toilet paper 100 at a predetermined value, and it is possible to appropriately ensure the feeling of thickness of the toilet paper 100.

Further, among the front thin paper 11 and the back thin paper 12, a plurality of micro embosses 5 are arranged between the macro emboss 4 provided on one thin paper 1 and the macro emboss 4 provided on the other thin paper 1. .
The micro embossing 5 is formed, for example, in a substantially cut cone shape. As shown in FIG. 3, the micro embossing 5 is provided between two micro embossing 5 and 5 provided on one thin paper 1 of the front thin paper 11 and the back thin paper 12. Further, the micro embossing 5 provided on the other thin paper 1 is formed so as to be positioned. That is, the plurality of microembosses 5 are disposed at positions that are relatively displaced from the front thin paper 11 and the back thin paper 12.
Thereby, the toilet paper 100 can be more easily bent, and the softness of the toilet paper 100 can be improved more appropriately.

In addition, the ratio of the sum of the areas of the bottom surface portions (not shown) of the plurality of microembosses 5 to the area corresponding to one rotation of the production roll (not shown) used for forming the microembosses 5 in each thin paper 1 Is preferably, for example, 17 to 27%. Here, the area of the bottom surface portion of the micro embossing 5 is less than 1 mm ^2, and the diameter of the bottom surface portion is, for example, 0.508 mm.
Further, the number of microembosses 5 formed per predetermined area of each of the front thin paper 11 and the back thin paper 12 may be appropriately adjusted according to the required softness of the toilet paper 100.
Further, the method for forming the macro emboss 4 and the micro emboss 5 may be any method implemented in the manufacturing process of the toilet paper 100.

Moreover, the front thin paper 11 and the back thin paper 12 having the above-described configuration are the portion corresponding to the bottom surface 41 and the back thin paper by the adhesive G applied to the portion corresponding to the bottom surface 41 of the macro emboss 4 of the front thin paper 11. A portion facing the bottom surface portion 41 of 12 is adhered. As a result, an air layer is formed between the front thin paper 11 and the back thin paper 12 in a portion that is not bonded by the adhesive G, and the thickness and softness of the toilet paper 100 are improved. Can do.
Here, the peel strength [N] between the front thin paper 11 and the back thin paper 12 is preferably 0.05 to 0.4, for example. The reason why the lower limit is defined as 0.05 is that when the thickness is less than 0.05, the thin papers 1 cannot be properly bonded to each other. Moreover, the upper limit is defined as 0.4 because, if it exceeds 0.4, the toilet paper 100 becomes too hard and the touch is deteriorated.
The peel strength can be measured by, for example, cutting toilet paper into a 50 mm square, peeling it off a predetermined length, and then using a load cell for peeling test (TG200N, manufactured by Minebea) on the front and back surfaces of the toilet paper. Then, they were peeled off by pulling in a substantially vertical direction at a speed of 300 mm / min, and the strength at that time was measured.

  The method of applying the adhesive G is preferably a predetermined method that is performed, for example, in the bonding process of the thin paper 1 after the embossing is formed, but is not limited thereto and may be any method.

  Here, the adhesive G may have a color different from that of the thin paper 1. That is, according to the present invention, the degree of freedom of arrangement of the macro emboss 4 can be improved while ensuring the thickness feeling and water absorption of the toilet paper 100. By forming a pattern or forming a predetermined figure with a predetermined number of macro embosses 4 and applying an adhesive G having a color different from that of the thin paper 1 to the portions of the macro emboss 4 that form these patterns and figures Thus, the design of the toilet paper 100 can be improved.

Moreover, as adhesive G, Na salt of carboxymethylcellulose, PVA (polyvinyl alcohol), etc. are applicable, for example.
Further, the color of the adhesive G can be any color as long as it is different from white because, for example, the color of general toilet paper is white. For example, pink is preferable. The colorant may be any dye or pigment that is water-soluble and does not harm the human body. For example, an azo dye is preferred.

The toilet paper 100 having the above-described configuration is obtained by adding a predetermined amount of wet paper strength enhancer in the manufacturing process of the toilet paper 100, and has a tensile strength [N / 25 mm] in the longitudinal direction of the toilet paper 100 in a wet state. 0.35 to 0.8. Here, the lower limit is defined as 0.35. If the lower limit is less than 0.35, the thin paper 1 is torn in the application of glue (for example, water-based glue) during processing, and the glue is properly applied. It becomes difficult. Moreover, when the upper limit is defined as 0.8, when the value exceeds 0.8, water disintegration is deteriorated and the commercial value is lowered. Thereby, the toilet paper 100 in which the paper strength in the wet state is appropriately secured can be provided.
Examples of the wet paper strength enhancer include polyamide polyamine epichlorohydrin resin, urea formaldehyde resin, and melamine formaldehyde resin.

  Moreover, as a measuring method of the tensile strength, for example, according to a method according to JIS P8113 in measuring the dry tensile strength, a method is performed in which the toilet paper 100 is wetted using a predetermined moisture applying means such as a brush. It is done.

Moreover, it is preferable that the softness (bending synthesis | combination) of the toilet paper 100 of the said structure is 0.05-0.15N, for example. The lower limit is defined as 0.05N because if it is less than 0.05N, the toilet paper 100 becomes too soft and it is difficult to ensure a sense of thickness. Moreover, the upper limit is defined as 0.15N because when the thickness exceeds 0.15N, the toilet paper 100 becomes too hard and the touch is deteriorated.
In addition, as a measuring method of softness, the handle ohm method prescribed | regulated to JISL1096E method etc. are mentioned, for example.

Examples of the present invention and comparative examples will be described below.
In the following description, Example 1 is a toilet paper according to the present invention, and Comparative Example 1 is a comparative example as a so-called “Tip to Tip” toilet paper in which embosses are opposed to each other. 2 is a so-called “single embossed” type toilet paper in which embossing is formed in a state where four thin paper sheets are stacked, Comparative Example 3 is a so-called “double embossed” type toilet paper, and Comparative Example 4 is Each is manufactured as a normal toilet paper with embossing.

[Example 1, Comparative Examples 1 to 4]
(Composition of toilet paper, etc.)
Basis weight [g / m ² ] of one thin paper: 16.5 <Example 1>, 17.4 <Comparative Example 1>, 16.4 <Comparative Example 2>, 16.7 <Comparative Example 3>, 30 1 <Comparative Example 4>; The basis weight was measured according to a method according to JIS P8124.
Number of plies: 2 sheets <Example 1>, 2 sheets <Comparative example 1>, 4 sheets <Comparative example 2>, 2 sheets <Comparative example 3>, 1 sheet <Comparative example 4>
Thickness [μm]: 280 <Example 1>, 270 <Comparative Example 1>, 530 <Comparative Example 2>, 210 <Comparative Example 3>, 180 <Comparative Example 4>; This was performed using “PEACOCK G type” (manufactured by Ozaki Seisakusho).
Presence / absence of bonding: Existence <Example 1>, Existence <Comparative Example 1>, Exclusion <Comparative Example 2>, Existence <Comparative Example 3>, Existence <Comparative Example 4>; Apply adhesive (PVA) to the part corresponding to the bottom part of the macro embossing formed on any one of the thin papers, and face the part corresponding to the bottom part and the bottom part of the other thin paper It was done by adhering to the part to be.
Amount of addition of wet paper strength enhancer [%]: 0.5 <Example 1>, 0 <Comparative Example 3>; Polyamide polyamine epichlorohydrin was used as the wet paper strength enhancer, and the ratio was as dry weight. The amount [kg] added to 1 t of tissue paper is shown in terms of% by weight.
Dry tensile strength [N / 25 mm] in length (longitudinal direction) and width (short direction) (shown in order of length and width): 3.3, 1.8 <Example 1>, 4.54, 1.6 <Comparative Example 1> 5.31, 1.85 <Comparative Example 2>, 3.34, 1.37 <Comparative Example 3>, 2.81, 1.16 <Comparative Example 4>; Measurement of dry tensile strength Was measured according to a method according to JIS P8113.
Wet tensile strength in length and width [N / 25 mm] (shown in order of length and width): 0.59, 0.27 <Example 1>, 0.53, 0.21 <Comparative Example 1>, 0.84 0.24 <Comparative Example 2>, 0.33, 0.14 <Comparative Example 3>, 0.43, 0.16 <Comparative Example 4>; The wet tensile strength was measured with a toilet wet with a brush. It measured according to the method according to JISP8113 in the measurement of dry tensile strength using paper.
(Macro emboss dimensions, etc.)
Ratio of the sum of the area of the bottom surface of the macro embossing to the area corresponding to one rotation of the production roll in the thin paper (hereinafter simply referred to as “the ratio of macro embossing”) [%]: 8 <Example 1> 12.5 <Comparative Example 1>, 17.8 <Comparative Example 2>, 10.5 <Comparative Example 3>, 10.5 <Comparative Example 4>
In the area corresponding to one rotation of the production roll in the thin paper, the circumferential length [mm / cm ² ] (hereinafter simply referred to as “the length of the column”) of the outer peripheral portion of the bottom surface portion of the macro embossing: 38 ( It is shown as the sum of the lengths of the macro embosses formed on each of the front thin paper and the back thin paper.) <Example 1>, 28 <Comparative Example 1>, 55 <Comparative Example 2>, 37 <Comparative Example 3>, 37 <Comparative Example 4>

(Measurement of thickness and smoothness)
The thickness feeling and smoothness of each toilet paper were evaluated in five stages by 50 testers. Here, the larger the value, the better the feeling of thickness and smoothness.
(Measure softness)
The softness [N] of each toilet paper was measured based on the handle ohmmeter method defined in JIS L1096 E method.
(Measurement of peel strength)
The measurement of the peel strength of each toilet paper was performed according to the test method described above.

(Measurement of MMD value (average deviation of friction coefficient))
First, as shown in FIG. 5, the friction element 20 is composed of a plurality of piano wires P having a diameter of 0.5 mm (curvature radius: 0.25 mm; see FIG. 5B) adjacent to each other, both in length and width. It has a contact surface for a measurement sample formed to be 10 mm. Then, tension is applied while the contact surface of the friction element 20 is brought into contact with the surface of the measurement sample to which tension of 20 g / cm is applied in a predetermined direction (downwardly rightward in FIG. 5) with a contact pressure of 50 g. It was moved 2 cm at a speed of 0.1 cm / s in a direction (longitudinal direction) substantially the same as the above direction or a direction perpendicular to the direction (lateral direction). The friction coefficient at this time is measured using a friction tester KES-SE (manufactured by Kato Tech Co., Ltd.), and a value obtained by dividing the measured friction coefficient by the friction distance (movement distance = 2 cm) is the friction element 20. Was calculated for each moving direction, and the average value thereof was taken as the MMD value.
In FIG. 5, an enlarged view of a portion surrounded by an alternate long and short dash line in FIG. 5A is shown in FIG.

(Measurement of water absorption)
First, five sheets of each toilet paper cut into 100 mm squares were prepared and used as measurement samples. The weight of each measurement sample (up to the third decimal place) was measured. Thereafter, each measurement sample was placed on a sample support member (support portion dimensions: 120 mm × 120 mm, lattice spacing 15 mm, wire thickness) 7 shown in FIG. 4 and a bat (length: vertical) filled with 500 ml of pure water. 200 mm × width: 150 mm × depth: 40 mm) 8, and the measurement sample was removed from the sample support member 7 and floated on pure water. When the pure water spreads over the entire measurement sample, the measurement sample was immediately pulled up using the sample support member 7 and drained for 30 seconds.
The drained measurement sample was transferred to a previously measured container (not shown) using tweezers (not shown), and the weight of the measurement sample was measured together with the container. And the average was computed from the value measured for every toilet paper, and it was set as the water absorption amount of each toilet paper.
In FIG. 4, the bat 8 is indicated by a broken line, and a state in which the bat 8 is seen through is illustrated.

The measurement results of each test are shown in Table 1.

[Evaluation]
(Effect of basis weight)
When the basis weight of one thin paper sheet was larger than 25 g / m ² (Comparative Example 4), the MMD value was 12 and increased, but when it was 25 g / m ² or less (Example 1), the MMD value was 9.8. It was possible to improve the smoothness of the toilet paper and improve the touch.

(Influence of macro emboss dimensions)
When the ratio of macro embossing is 12.5% or more (Comparative Example 1 and Comparative Example 2), softness and MMD values that are indices of the feeling of touch of toilet paper are increased, but it is 12.5% or less. (Example 1), the softness and MMD values could be reduced with 0.162 [N] and 9.8, and the softness and smoothness of the toilet paper could be improved to improve the touch. .
Moreover, when the length of the column was shorter than 35 mm / cm ² (Comparative Example 1), the thickness of the toilet paper and the amount of water absorption decreased, and these could not be sufficiently secured. ^{When it was 2} or more (Example 1), it was possible to improve the thickness and water absorption of the toilet paper.

(Influence of the number of plies)
When the number of thin paper sheets is 4 (Comparative Example 2), the toilet paper becomes thick and the water absorption amount can be improved. However, since the basis weight of the entire toilet paper is increased, the product cost is increased. Moreover, in the toilet paper which consists of one thin paper (comparative example 4), the feeling of thickness and water absorption of the toilet paper were not able to be ensured.

(Influence of bonding)
In the case where the thin papers were not bonded together (Comparative Example 3), the thickness feeling of the toilet paper and the water absorption decreased, but by sticking the thin papers together (Example 1), the thickness feeling of the toilet paper and Both water absorption was able to be improved. In addition, since the peel strength of thin paper increased / decreased according to the application quantity of an adhesive agent, the toilet paper of the comparative example 1 with many macro embossing compared with the thing of Example 1 became larger.

(Influence of wet paper strength enhancer)
In the case where the wet paper strength enhancer was not added (Comparative Example 3), the wet tensile strength (longitudinal) was less than 0.35, but by adding 0.5% by weight of the wet paper strength enhancer (implemented) Example 1) The wet tensile strength (longitudinal) could be improved. Thereby, while ensuring a feeling of thickness, water absorption, softness, and smoothness, it is thought that the toilet paper which ensured the paper strength in a wet state can be provided.

As described above, according to the toilet paper 100 of this embodiment, even if the number of macro embosses 4 is reduced as compared with, for example, “Tip to Tip” toilet paper, the front thin paper 11 and the back thin paper 12 The macro embossing 4 disposed at a relatively deviated position can sufficiently secure a supporting force for maintaining the thickness of the toilet paper 100 at a predetermined value. Sex can be ensured appropriately. Thereby, since the number of the macro embossing 4 can be reduced, while the smoothness of the toilet paper 100 can be improved, the number of the micro embossing 5 can be increased. And since the micro embossing 5 is arrange | positioned in the position relatively shifted | deviated with the front thin paper 11 and the back thin paper 12, the toilet paper 100 becomes easy to curve more and the softness of the said toilet paper 100 is concerned. Can be improved.
As described above, even when the toilet paper 100 is configured by stacking at least two thin paper sheets 1 and 1, the thickness and water absorption of the toilet paper 100 are appropriately secured, Smoothness can be suitably improved.

Moreover, since the front thin paper 11 and the back thin paper 12 are bonded together with the adhesive G, the thickness feeling and water absorption of the toilet paper 100 can be improved more appropriately.
Furthermore, the tensile strength [N / 25 mm] in the longitudinal direction of the toilet paper 100 in a wet state can be set to 0.35 to 0.8 by adding a predetermined amount of the wet paper strength enhancer. Toilet paper 100 in which paper strength in a wet state is appropriately secured can be provided.

The present invention is not limited to the above embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.
For example, in the above embodiment, the toilet paper 100 is configured by two sheets of the front thin paper 11 and the back thin paper 12, but is not limited thereto, and is configured by at least two thin papers 1. Just do it.
Further, the shape of the macro emboss 4 and the micro emboss 5 is not limited to the above embodiment, and may be any shape. Furthermore, according to the present invention, since the degree of freedom of the arrangement of the macro embossing 4 can be increased, the arrangement of the macro embossing 4 is limited to a substantially arc shape or a substantially circular shape as shown in the drawings. It is not a thing and what kind of arrangement may be sufficient.

  In addition, in order to bond the front thin paper 11 and the back thin paper 12, the adhesive G is applied to the portion corresponding to the bottom surface portion of the macro emboss 4 formed on the front thin paper 11, but the present invention is not limited to this. Alternatively, it may be applied to a portion corresponding to the bottom surface portion of the macro emboss 4 formed on the back thin paper 12, or may be applied to a portion corresponding to the bottom surface portion of the macro emboss 4 formed on both thin papers 1. good.

  Furthermore, the adhesive G may be substantially the same color or colorless as the thin paper 1, and a predetermined print may be applied to the surface of the thin paper 1, and the design of the toilet paper 100 can also be improved by such a configuration. Moreover, you may make it improve the design property of the toilet paper 100 by forming a predetermined pattern with both the adhesive G of a different color from the thin paper 1, and the print formed on the surface of the thin paper 1. FIG.

  Moreover, in the said embodiment, although toilet paper 100 was illustrated as water-decomposable sanitary paper, it is not restricted to this.

It is a perspective view of the toilet paper illustrated as one embodiment to which the present invention is applied. It is the top view which expanded and showed the principal part of the toilet paper of FIG. It is principal part sectional drawing of the toilet paper in the III-III line of FIG. It is the perspective view which showed the bat and measurement support member which are used for the measurement of the water absorption amount of toilet paper. It is a figure for demonstrating the measurement of the MMD value of toilet paper.

Explanation of symbols

100 Toilet paper (water-degradable sanitary paper)
1 Thin paper 11 Front thin paper 12 Back thin paper 4 Macro emboss (first embossed recess)
41 Bottom 5 Micro-emboss (second embossed recess)
G adhesive

Claims (8)

A water-degradable sanitary paper made of at least two thin papers,
The front thin paper and the back thin paper constituting the front and back surfaces of the water-decomposable sanitary paper have a plurality of first embossed recesses and a plurality of smaller shapes than the first embossed recesses so as to enter the opposing thin paper side. A second embossed recess is provided,
The first embossed recess and the second embossed recess provided in the front thin paper are disposed at positions shifted relative to the first embossed recess and the second embossed recess provided in the back thin paper. And
Of the front thin paper and the back thin paper, the second embossed concave portion is disposed between the first embossed concave portion provided in one thin paper and the first embossed concave portion provided in the other thin paper. Water-degradable sanitary paper characterized by   A portion corresponding to one rotation of the production roll used for forming the first embossed recess in each of the front thin paper and the back thin paper has a bottom surface portion of the plurality of first embossed recesses with respect to the area of this portion. 2. The water-decomposable sanitary paper according to claim 1, wherein the first embossed recess is provided so that the ratio of the sum of the areas is less than 12.5%. A portion of the front thin paper and the back thin paper corresponding to one rotation of the production roll used for forming the first embossed concave portion has a circumferential direction at a predetermined position of a side wall portion of the plurality of first embossed concave portions. The water-decomposable sanitary paper according to claim 1 or 2, wherein the first embossed recess is provided so that the sum of the lengths is 35 mm / cm ² or more. The area of the bottom surface portion of the second embossed depressions is, water-degradable hygiene paper according to claim 1, characterized in that less than 1 mm ^2.   The water-degradable sanitary paper according to any one of claims 1 to 4, wherein the water-degradable sanitary paper in a wet state has a tensile strength [N / 25 mm] in the longitudinal direction of 0.35 to 0.8. . The basis weight of each of the thin paper is water-degradable hygiene paper according to any one of claims 1 to 5, characterized in that a 13~25g / m ^2. Two sheets of the water-decomposable sanitary paper, the front thin paper and the back thin paper,
The front thin paper and the back thin paper are formed by adhering a bottom surface portion of the first embossed concave portion of at least one thin paper paper and a portion facing the bottom surface portion of the other thin paper paper with an adhesive. Item 7. The water-decomposable sanitary paper according to any one of items 1 to 6.   The water-decomposable sanitary paper according to claim 7, wherein the adhesive has a color different from that of the thin paper.

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