Recycled pulp-containing non-hydrolyzable sanitary paper and method or use for enhancing tensile strength of the paper

Abstract

To provide recycled pulp-containing non-hydrolyzable sanitary paper with enhanced tensile strength.SOLUTION: There is provided recycled pulp-containing non-hydrolyzable sanitary paper in which the recycled pulp includes corrugated board recycled pulp.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to non-water-decomposable sanitary paper such as paper towels and a method for increasing the tensile strength thereof. [Background technology]

[0002] As sanitary papers used for sanitary purposes, for example, disposable papers such as paper towels, tissue paper, toilet paper, etc. are widely used.

[0003] Paper towels that are primarily used in the kitchen for purposes such as draining water and oil from meat, fish, and vegetables; laying on cutting boards; wiping off dishes; wiping off grease from frying pans; maintaining gas ranges and extractor fans; wiping off stains from the dining table, etc. are also called kitchen paper (including cooking paper) and are well known as a type of household paper.

[0004] In consideration of the environmental impact, recycled paper pulp is sometimes used as a raw material for such sanitary paper (Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2008-255496 A Summary of the Invention [Problem to be solved by the invention]

[0006] Among sanitary papers, paper towels and tissue paper are non-water-degradable, meaning that the fibers that make up the paper do not disperse in water, whereas toilet paper is water-degradable, meaning that the fibers that make up the paper disperse in water.

[0007] Compared with water-degradable sanitary paper such as toilet paper, non-water-degradable sanitary paper such as paper towels and tissue paper is often required to be strong for use in wiping down kitchens, etc. However, non-water-degradable sanitary paper made from recycled paper pulp has lower strength than non-water-degradable sanitary paper made from virgin pulp.

[0008] An object of the present invention is to provide a non-water-degradable sanitary paper containing recycled paper pulp having improved tensile strength. [Means for solving the problem]

[0009] As a result of extensive research, the inventors discovered that the tensile strength of non-water-degradable sanitary paper made from recycled paper pulp can be increased by blending recycled cardboard pulp with the recycled paper pulp, and thus completed the present invention.

[0010] A first aspect of the present invention is a non-water-degradable sanitary paper containing recycled paper pulp, The present invention relates to a non-water-decomposable sanitary paper containing recycled paper pulp, wherein the recycled paper pulp includes recycled cardboard paper pulp.

[0011] It is preferable that 30% by mass or more of the recycled paper pulp is recycled cardboard pulp.

[0012] The waste paper pulp preferably consists solely of waste corrugated cardboard pulp.

[0013] The non-water-decomposable sanitary paper has a basis weight of 10 to 100 g / m 2 It is preferable that:

[0014] The non-water-degradable sanitary paper preferably has a thickness of 50 to 300 μm.

[0015] The non-water-degradable sanitary paper is preferably crepe paper.

[0016] The non-water-degradable sanitary paper is preferably a paper towel.

[0017] A second aspect of the present invention is a method for increasing the tensile strength of non-water-degradable sanitary paper containing recycled paper pulp, comprising: The present invention relates to a method for producing a recycled paper pulp from cardboard, the method comprising the step of blending the recycled paper pulp with recycled cardboard pulp.

[0018] A third aspect of the present invention relates to the use of recycled corrugated paper pulp in recycled paper pulp for increasing the tensile strength of non-water-decomposable sanitary paper containing the recycled paper pulp. Effect of the Invention

[0019] According to the present invention, it is possible to provide non-water-decomposable sanitary paper containing recycled paper pulp with improved tensile strength. The higher the content of recycled corrugated paper pulp in the recycled paper pulp, the higher the tensile strength of the non-water-decomposable sanitary paper containing recycled paper pulp can be.

[0020] Therefore, the non-water-degradable sanitary paper containing recycled paper pulp according to the present invention is highly usable, for example, in wiping tasks in the kitchen, etc., as the paper is less likely to tear even when wiping with force.

[0021] The non-hydrolyzable sanitary paper containing recycled paper pulp according to the present invention uses recycled paper pulp as a raw material, which reduces the environmental impact compared to using virgin pulp as a raw material. Furthermore, the use of recycled corrugated cardboard pulp also allows for the effective use of used corrugated cardboard, etc.

[0022] When the non-water-decomposable sanitary paper containing recycled paper pulp according to the present invention is creped paper, the paper has increased elasticity and is more compliant with deformation caused by external forces, which further reduces tearing of the sanitary paper. Also, by reducing the crepe ratio, the paper thickness can be reduced and the production speed can be increased. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] [First aspect] A first aspect of the present invention is a non-water-degradable sanitary paper containing recycled paper pulp, The recycled paper pulp is characterized in that it contains recycled corrugated paper pulp.

[0024] Sanitary paper is paper used for the purpose of improving hygienic conditions, and examples of such paper include disposable papers such as tissue paper (such as face wipes and cosmetic paper), tissue paper, paper towels (such as kitchen paper), toilet paper, and watting paper (see, for example, Paper and Pulp Technology Handbook, 5th edition, p. 459, published January 30, 1992, edited and published by the Paper and Pulp Technology Association). Sanitary paper is also called sanitary paper (JIS P0001:1998).

[0025] Among sanitary papers, paper towels, tissue paper, etc. are non-water-degradable, and the fibers that make up the paper do not disperse in water, but toilet paper, which is flushed down the toilet, etc., is water-degradable, and the fibers that make up the paper disperse in water. The water temperature here can be room temperature (25°C).

[0026] A first aspect of the present invention is non-water-degradable sanitary paper. In the non-water-degradable sanitary paper of the present invention, the fibers that make up the paper do not disperse in water. In other words, the non-water-degradable sanitary paper of the present invention is non-water-dispersible paper. Therefore, the non-water-degradable sanitary paper of the present invention is not toilet paper, particularly for use in flush toilets.

[0027] The non-water-decomposable sanitary paper according to the present invention is preferably a paper towel such as kitchen paper. Kitchen paper (including cooking paper) is mainly used in the kitchen for draining water and oil from meat, fish, vegetables, etc., as a cutting board cover, wiping off dishes, wiping off oil from frying pans, maintaining gas ranges, ventilation fans, etc., wiping off dirt from dining tables, etc.

[0028] Sanitary paper is porous and has the ability to absorb liquids, such as water, oil, etc. Therefore, the non-water-decomposable sanitary paper of the present invention has water-absorbency and oil-absorbency, and is suitable for use in the kitchen, for example.

[0029] The non-water-degradable sanitary paper according to the present invention contains recycled paper pulp. The non-water-degradable sanitary paper according to the present invention contains recycled paper pulp as its raw material. The recycled paper pulp-containing non-water-degradable sanitary paper according to the present invention uses recycled paper pulp as its raw material, which reduces the environmental impact compared to using virgin pulp as the raw material.

[0030] The waste paper pulp contained in the non-water-degradable sanitary paper according to the present invention includes waste corrugated cardboard pulp. Waste corrugated cardboard pulp is pulp derived from corrugated cardboard, and "corrugated cardboard" here includes not only the finished corrugated cardboard but also the components (liner, core paper) that constitute the corrugated cardboard. Both used and unused corrugated cardboard can be used. Scraps of corrugated cardboard generated during the corrugated cardboard manufacturing process can also be used. Waste corrugated cardboard pulp may be derived from two or more types of corrugated cardboard. By using waste corrugated cardboard pulp, it is possible to effectively utilize used corrugated cardboard, scraps generated during the corrugated cardboard manufacturing stage, excess corrugated cardboard, stock corrugated cardboard, etc.

[0031] The non-water-degradable sanitary paper according to the present invention contains recycled cardboard pulp, which gives it excellent tensile strength. In particular, the non-water-degradable sanitary paper according to the present invention has excellent tensile strength in the longitudinal direction (M direction). Therefore, the non-water-degradable sanitary paper containing recycled paper pulp according to the present invention is less likely to tear even when wiping hard in the kitchen, for example, and is therefore excellent in usability.

[0032] Waste corrugated cardboard pulp can be produced, for example, by putting corrugated cardboard into a pulper, adding water or hot water and, if necessary, chemicals such as surfactants, and stirring to loosen the cellulose fibers and other fibers that make up the corrugated cardboard. Since corrugated cardboard contains a relatively large amount of foreign matter such as adhesives, adhesive tape, staples, etc., it is preferable to remove the foreign matter in the waste corrugated cardboard pulp using a screen or the like. In addition, in order to remove ink printed on the corrugated cardboard, it is preferable to remove the ink by deinking. Furthermore, sterilization or disinfection may be performed using hydrogen peroxide, sodium hypochlorite, etc., if necessary.

[0033] The waste paper pulp may include waste paper pulp other than waste corrugated cardboard pulp. The raw material of the waste paper pulp other than waste corrugated cardboard pulp is not particularly limited, and any waste paper pulp made from, for example, newspapers, magazines, etc. may be used.

[0034] The mixing ratio of the waste cardboard pulp in the waste paper pulp contained in the non-hydrolyzable sanitary paper according to the present invention is not particularly limited, but is preferably 10% by mass or more, more preferably 20% by mass or more, more preferably 30% by mass or more, more preferably 40% by mass or more, more preferably 50% by mass or more, more preferably 60% by mass or more, more preferably 70% by mass or more, more preferably 80% by mass or more, more preferably 90% by mass or more, and most preferably 100% by mass. The higher the mixing ratio of the waste cardboard pulp in the waste paper pulp, the higher the tensile strength of the non-hydrolyzable sanitary paper containing the waste paper pulp can be. Therefore, it is most preferable that the waste paper pulp consists of only the waste cardboard pulp.

[0035] The blend ratio of recycled paper pulp contained in the non-water-degradable sanitary paper of the present invention is not particularly limited, but is preferably 10% by mass or more, more preferably 20% by mass or more, more preferably 30% by mass or more, more preferably 40% by mass or more, more preferably 50% by mass or more, more preferably 60% by mass or more, more preferably 70% by mass or more, more preferably 80% by mass or more, more preferably 90% by mass or more, and most preferably 100% by mass.

[0036] The non-water-decomposable sanitary paper according to the present invention may contain other fiber raw materials than waste paper pulp. The other fiber raw materials than waste paper pulp are not particularly limited, and include virgin pulp, natural fibers such as cotton and wool, regenerated fibers such as rayon, and synthetic fibers made from synthetic polymers such as vinylon, nylon, polyester, polyethylene, polypropylene, and acrylic. These other fiber raw materials may be used alone or may be mixed and composite. As the virgin pulp, virgin wood pulp is preferable. As the virgin wood pulp, for example, softwood pulp such as NBKP (softwood kraft pulp) and NUKP (softwood unbleached pulp) and hardwood pulp such as LBKP (hardwood kraft pulp) and LUKP (hardwood unbleached pulp) can be used alone or mixed in an appropriate ratio, and for example, the ratio of softwood pulp:hardwood pulp can be 1 (25%):3 (75%) to 1 (50%):1 (50%). It is preferable that the non-water-degradable sanitary paper according to the present invention does not contain any other fiber raw material than recycled paper pulp.

[0037] The non-water-decomposable sanitary paper according to the present invention can be manufactured by a conventionally known manufacturing method, except that recycled corrugated paper pulp is used as part of the raw materials. For example, the non-water-decomposable sanitary paper according to the present invention can be manufactured by preparing a stock using recycled corrugated paper pulp and, if necessary, other recycled paper pulp and / or other fiber raw materials, and then carrying out papermaking. In the wire part of the papermaking process, the stock is spread on a mesh-like wire of a papermaking machine such as a Fourdrinier papermaking machine or a cylinder papermaking machine, and wet paper is produced by passing water through the wire. In the next pressing process, the wet paper passes between rollers to squeeze out the water, and in the next drying process, the wet paper is dried by a dryer such as a cylindrical Yankee dryer to become paper.

[0038] The paper material may contain additives normally used in papermaking, such as wet strength agents and dry strength agents, in addition to fiber raw materials such as recycled corrugated cardboard pulp. Since the non-water-degradable sanitary paper of the present invention can exhibit excellent tensile strength by using recycled corrugated cardboard pulp, the amount of wet strength agents or dry strength agents can be reduced. Therefore, in the non-water-degradable sanitary paper of the present invention, the amount of wet strength agents or dry strength agents can be less than 0.10% by mass of the fiber raw materials, and can be, for example, 0.05 to 0.08% by mass.

[0039] The basis weight of the non-water-decomposable sanitary paper according to the present invention is not particularly limited, but the basis weight (measurement method: JIS P 8124

[2011] ) is 10 g / m 2 ~100g / m 2 is preferred, and 20 g / m 2 ~75g / m 2 More preferably, 30 g / m 2 ~50g / m 2 is even more preferred.

[0040] The thickness of the non-water-degradable sanitary paper according to the present invention is not particularly limited, but the thickness (measurement method: JIS P 8118

[2014] ) is preferably 50 μm to 300 μm, more preferably 60 μm to 250 μm, even more preferably 70 μm to 200 μm, and even more preferably 80 μm to 150 μm.

[0041] The non-water-decomposable sanitary paper according to the present invention is preferably made of crepe paper. Crepe paper has many wrinkles and has excellent elasticity, so it has high deformability. Therefore, the non-water-decomposable sanitary paper according to the present invention made of crepe paper has excellent elasticity, is highly adaptable to deformation due to external forces, and is less likely to tear.

[0042] Crepe paper can be produced by a conventional method. For example, a wet paper is pressed against the surface of a heated cylindrical Yankee dryer, and after a certain amount of drying, the paper body is peeled off from the Yankee dryer by a doctor blade and creped. By lowering the crepe rate, the paper thickness can be reduced and the production speed can be increased.

[0043] The non-water-decomposable sanitary paper according to the present invention preferably has irregularities on one or both surfaces. The irregularities may be present on only a part of the surface of the paper, or may be present on the entire surface.

[0044] The unevenness is preferably imparted by embossing. The height of the unevenness (the vertical height from the bottom of the recess to the top of the protrusion) is not particularly limited, but may be, for example, 0.1 mm to 5 mm, or 1 mm to 3 mm.

[0045] The form of the non-water-degradable sanitary paper according to the present invention is not particularly limited, and may be in the form of a roll of long sanitary paper wound up, but is preferably in a non-roll form, more preferably a laminate of flat sanitary paper, and even more preferably the flat sanitary paper is folded and stored in a packaging bag. The non-water-degradable sanitary paper according to the present invention may be in the form of one sheet (so-called 1-ply) folded in half for use, or a set of a laminated structure of two sheets (so-called 2-ply) or three sheets (so-called 3-ply) or more sheets folded in half for use in the same way as one sheet.

[0046] It is preferable that the non-water-decomposable sanitary paper according to the present invention is contained in the packaging bag in a pop-up manner. With the pop-up type, after the non-water-decomposable sanitary paper according to the present invention is taken out of the packaging bag, a part of the next sanitary paper is outside the packaging bag, so that it is easy to take out the next sanitary paper.

[0047] The non-water-decomposable sanitary paper according to the present invention is preferably not a garment such as a diaper, incontinence pants for adults, or training pants for infants.

[0048] The non-water-degradable sanitary paper according to the present invention is preferably packaged in a packaging bag to form a package. The shape of the package is not particularly limited, and it can be, for example, a non-box shape or a box shape.

[0049] The packaging bag preferably has at least one air hole, which has the function of discharging air from within the packaging bag to the outside, and by discharging the air from within the packaging bag to the outside, the volume of the packaging bag can be reduced, making it easier to pack the package, for example.

[0050] The air hole can be formed, for example, by piercing the packaging bag with at least one needle or the like.

[0051] The number of air holes is not particularly limited, but is preferably more than one, and more preferably 2 to 100, and more preferably 10 to 50 per packaging bag.

[0052] The (cross-sectional) shape of the air hole is not limited, for example, the air hole shape may be circular or non-circular, and an example of a non-circular air hole shape may be a short slit.

[0053] The interval between the air holes is not particularly limited. For example, the interval between the air holes can be in the range of 10 mm to 50 mm, preferably in the range of 15 mm to 40 mm, and more preferably in the range of 20 mm to 30 mm.

[0054] The density of the air holes is not particularly limited. For example, the density of the air holes is set to 1 to 10 holes / 25 cm on the surface on which the air holes are present. 2 The range is 2~8 pieces / 25cm 2 The range is preferably 3 to 6 pieces / 25 cm. 2 The range is more preferable.

[0055] The distribution of the air holes can be uniform or non-uniform. For example, when the packaging bag is box-shaped, it is preferable to form the air holes on the side surface of the packaging bag.

[0056] A plurality of air holes may be arranged in a straight line to form one or more air hole rows. The spacing between the air hole rows is not limited, but may be, for example, 5 mm to 50 mm, 10 mm to 40 mm, or 15 mm to 30 mm.

[0057] The packaging bag is preferably made of paper. That is, the packaging body is preferably made of paper. The raw material of the paper constituting the packaging bag is not particularly limited, and examples thereof include natural fibers such as wood pulp, cotton, and wool, regenerated fibers such as rayon, and synthetic fibers made from synthetic polymers such as vinylon, nylon, polyester, polyethylene, polypropylene, and acrylic. These fibers may be used alone or may be mixed and composite.

[0058] The raw material for the paper constituting the packaging bag is preferably wood pulp, and virgin wood pulp, recycled paper pulp, or a mixture thereof can be used. Examples of wood pulp that can be used include softwood pulp such as NBKP (softwood kraft pulp) and NUKP (softwood unbleached pulp), hardwood pulp such as LBKP (hardwood kraft pulp) and LUKP (hardwood unbleached pulp), and mixtures of softwood pulp and hardwood pulp.

[0059] It is preferable that a thermoplastic resin layer is present on the surface of the paper constituting the packaging bag. In other words, it is preferable that the packaging bag is constituted by a laminate having a thermoplastic resin layer on a paper base material.

[0060] When a thermoplastic resin layer is present on the surface of the paper base material constituting the packaging bag, the packaging bag can be easily manufactured by melting the thermoplastic resin layer and heat sealing it. The thermoplastic resin layer does not need to be present on the entire surface of the paper base material, and may be present on at least a part (e.g., an end) of the surface of the paper base material, but may be present on the entire surface of the paper base material.

[0061] When the laminate is used to form a packaging bag, it is preferable that the paper base material forms the outer surface of the packaging bag, so that the packaging bag can be easily recognized as being made of paper.

[0062] The method for producing the laminate is not particularly limited, and it can be produced by, for example, integrating the paper substrate and the thermoplastic resin layer by extrusion lamination of the thermoplastic resin, integrating a thermoplastic resin film and the paper substrate with an adhesive, etc. A method for integrating the paper substrate and the thermoplastic resin layer by extrusion lamination is preferred. That is, the thermoplastic resin is preferably an extrusion coating layer.

[0063] The combined thickness of the paper base material and the thermoplastic resin layer is preferably 50 μm to 300 μm, more preferably 60 μm to 200 μm, and even more preferably 70 μm to 100 μm.

[0064] [Second aspect] A second aspect of the present invention is a method for increasing the tensile strength of non-water-degradable sanitary paper containing recycled paper pulp, comprising: The method further comprises the step of blending the recycled paper pulp with recycled corrugated paper pulp.

[0065] The explanation in the first aspect of the present invention applies to the non-water-decomposable sanitary paper, waste paper pulp, and waste cardboard paper pulp.

[0066] In a second aspect of the present invention, by blending recycled corrugated paper pulp with recycled paper pulp, which is the raw material for recycled paper pulp-containing non-water-degradable sanitary paper, the tensile strength of the recycled paper pulp-containing non-water-degradable sanitary paper, particularly the tensile strength in the longitudinal direction (M direction), can be increased.

[0067] The mixing ratio of the cardboard waste paper pulp in the waste paper pulp is not particularly limited, but is preferably 10% by mass or more, more preferably 20% by mass or more, more preferably 30% by mass or more, more preferably 40% by mass or more, more preferably 50% by mass or more, more preferably 60% by mass or more, more preferably 70% by mass or more, more preferably 80% by mass or more, more preferably 90% by mass or more, and most preferably 100% by mass. The higher the mixing ratio of the cardboard waste paper pulp in the waste paper pulp, the higher the tensile strength of the non-hydrolyzable sanitary paper containing the cardboard waste paper pulp can be. Therefore, it is most preferable that the waste paper pulp consists of only cardboard waste paper pulp.

[0068] [Third aspect] A third aspect of the present invention is the use of recycled corrugated paper pulp in recycled paper pulp to increase the tensile strength of non-water-decomposable sanitary paper containing the recycled paper pulp.

[0069] The explanation in the first aspect of the present invention applies to the non-water-decomposable sanitary paper, waste paper pulp, and waste cardboard paper pulp.

[0070] In a third aspect of the present invention, by using cardboard waste paper pulp in the waste paper pulp that is the raw material for non-water-degradable sanitary paper containing waste paper pulp, the tensile strength of the non-water-degradable sanitary paper containing waste paper pulp, particularly the tensile strength in the longitudinal direction (M direction), can be increased.

[0071] The proportion of cardboard waste paper pulp in the waste paper pulp is not particularly limited, but is preferably 10% by mass or more, more preferably 20% by mass or more, more preferably 30% by mass or more, more preferably 40% by mass or more, more preferably 50% by mass or more, more preferably 60% by mass or more, more preferably 70% by mass or more, more preferably 80% by mass or more, more preferably 90% by mass or more, and most preferably 100% by mass. The higher the amount of cardboard waste paper pulp in the waste paper pulp, the higher the tensile strength of the non-hydrolyzable sanitary paper containing the cardboard waste paper pulp can be. Therefore, it is most preferable that the waste paper pulp consists of cardboard waste paper pulp only. [Industrial Applicability]

[0072] The non-water-degradable sanitary paper containing recycled paper pulp according to the present invention can be suitably used as non-water-degradable sanitary paper that requires strength when used, such as paper towels.

[0073] The non-hydrolyzable sanitary paper containing recycled paper pulp according to the present invention uses recycled paper pulp as a raw material, which reduces the environmental impact compared to using virgin pulp as a raw material. Furthermore, by using recycled cardboard pulp, it is possible to effectively utilize used cardboard, etc. EXAMPLES

[0074] The present invention will be described in more detail below using examples and comparative examples, but the scope of the present invention is not limited to the examples. In the following, the basis weight and paper thickness were measured as follows.

[0075] Basis weight: Measured in accordance with JIS P8124. Paper thickness: Measured in accordance with JIS P8118.

[0076] [Example 1] A dry strength agent (DS4424 manufactured by Seiko PMC) and a wet strength agent (WS4030 manufactured by Seiko PMC) were added to a slurry containing deinked waste paper pulp and cardboard waste paper pulp mixed in a weight ratio of 70:30, at concentrations of 0.4% by weight and 0.2% by weight, respectively, relative to the waste paper pulp. The slurry was then run on a cylinder Yankee papermaking machine and the papermaking speed was adjusted to produce a grammage of 32.5 g / m2. 2 and a paper towel in the form of crepe paper having a thickness of 87 μm was produced.

[0077] [Comparative Example 1] A 31.1 g / m2 sheet was prepared in the same manner as in Example 1, except that no recycled corrugated cardboard pulp was used. 2 and a paper towel in the form of crepe paper having a thickness of 87 μm was produced.

[0078] [Example 2] A dry strength agent (DS4424 manufactured by Seiko PMC) and a wet strength agent (WS4030 manufactured by Seiko PMC) were added to a slurry containing deinked waste paper pulp and cardboard waste paper pulp mixed in a weight ratio of 70:30, at concentrations of 0.4% by weight and 0.2% by weight, respectively, relative to the waste paper pulp. The slurry was then run on a cylinder Yankee papermaking machine and the papermaking speed was adjusted to produce a grammage of 35.2 g / m. 2 and a paper towel in the form of crepe paper having a thickness of 101 μm was produced.

[0079] [Comparative Example 2] A 34.7 g / m2 slab was prepared in the same manner as in Example 2, except that no recycled corrugated cardboard pulp was used. 2 and a paper towel in the form of crepe paper having a thickness of 100 μm was produced.

[0080] [Example 3] A dry strength agent (DS4424 manufactured by Seiko PMC) and a wet strength agent (WS4030 manufactured by Seiko PMC) were added to a slurry containing deinked waste paper pulp and cardboard waste paper pulp mixed in a weight ratio of 70:30, at concentrations of 0.4% by weight and 0.2% by weight, respectively, relative to the waste paper pulp. The papermaking speed was adjusted on a cylinder Yankee papermaking machine to produce a grammage of 42.3 g / m. 2 and a paper towel in the form of crepe paper having a thickness of 108 μm was produced.

[0081] [Comparative Example 3] A 41.5 g / m2 slab was prepared in the same manner as in Example 3, except that no recycled corrugated cardboard pulp was used. 2 and a paper towel in the form of crepe paper having a thickness of 103 μm was produced.

[0082] [evaluation] The tensile strength (longitudinal and transverse directions) of each of the paper towels of Examples 1 to 3 and Comparative Examples 1 to 3 was measured in accordance with JIS P8113, and the specific tensile strength (longitudinal and transverse directions) was determined by dividing by the basis weight. The results are shown in Table 1. The basis weight and paper thickness of each of the paper towels of Examples 1 to 3 and Comparative Examples 1 to 3 are also shown in Table 1.

[0083] [Table 1]

[0084] As is clear from a comparison of Example 1 and Comparative Example 1, Example 2 and Comparative Example 2, and Example 3 and Comparative Example 3, which have almost the same or similar basis weight and thickness, the (specific) tensile strength of the paper towels of the Examples containing recycled corrugated cardboard pulp is higher than the (specific) tensile strength of the paper towels of the Comparative Examples not containing recycled corrugated cardboard pulp. In particular, the (specific) tensile strength in the longitudinal direction is improved.

Claims

1. A non-hydrolyzable sanitary paper containing recycled paper pulp, The non-hydrolyzable sanitary paper containing waste paper pulp, wherein the waste paper pulp includes waste cardboard paper pulp.

2. 2. The non-water-decomposable sanitary paper containing waste paper pulp according to claim 1, wherein 30% by mass or more of the waste paper pulp is cardboard waste paper pulp.

3. 2. The non-water-decomposable sanitary paper containing waste paper pulp according to claim 1, wherein the waste paper pulp consists solely of waste corrugated cardboard pulp.

4. Basis weight: 10 to 100 g / m ２ The non-water-decomposable sanitary paper containing recycled paper pulp according to claim 1 .

5. The non-water-decomposable sanitary paper containing recycled paper pulp according to claim 1, which has a thickness of 50 to 300 μm.

6. 2. The non-water-decomposable sanitary paper containing recycled paper pulp according to claim 1, which is crepe paper.

7. 2. The non-water-decomposable sanitary paper containing recycled paper pulp according to claim 1, which is a paper towel.

8. A method for increasing the tensile strength of non-water-degradable sanitary paper containing recycled paper pulp, comprising the steps of: The method further comprises a step of blending the recycled paper pulp with recycled corrugated paper pulp.

9. The use of recycled corrugated paper pulp in recycled paper pulp for increasing the tensile strength of non-hydrolyzable sanitary paper containing the recycled paper pulp.

Images