EP3907328B1 - Toilettenpapier - Google Patents

Toilettenpapier Download PDF

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Publication number
EP3907328B1
EP3907328B1 EP20766224.8A EP20766224A EP3907328B1 EP 3907328 B1 EP3907328 B1 EP 3907328B1 EP 20766224 A EP20766224 A EP 20766224A EP 3907328 B1 EP3907328 B1 EP 3907328B1
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EP
European Patent Office
Prior art keywords
paper
toilet paper
toilet
pulp
ply
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EP20766224.8A
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English (en)
French (fr)
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EP3907328A1 (de
EP3907328A4 (de
Inventor
Shuta YASUI
Minoru Iwasaki
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Daio Paper Corp
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Daio Paper Corp
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Publication of EP3907328A4 publication Critical patent/EP3907328A4/de
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—Tissue paper; Absorbent paper
    • D21H27/004—Tissue paper; Absorbent paper characterised by specific parameters
    • D21H27/005—Tissue paper; Absorbent paper characterised by specific parameters relating to physical or mechanical properties, e.g. tensile strength, stretch, softness
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—Tissue paper; Absorbent paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • D21H11/04—Kraft or sulfate pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/07—Nitrogen-containing compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/22—Agents rendering paper porous, absorbent or bulky
    • D21H21/24—Surfactants
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
    • A47K10/00—Body-drying implements; Toilet paper; Holders therefor
    • A47K10/16—Paper towels; Toilet paper; Holders therefor

Definitions

  • the present invention relates to a toilet paper.
  • a wiping property may be required when a shower toilet, which is also called a toilet with a washing function, is used (Patent Literature 1 below).
  • Patent Literature 2 discloses a 4-6 ply toilet paper comprising a thickness of 350-550 micrometers, a basis weight of 40-75 g/m 2 and a water-degradability of 10-100 seconds.
  • a toilet paper suitable for the shower toilet is a multi-ply product such as a 3-ply or 4-ply product because it is easy for a consumer to obtain a security feeling during use of thereof.
  • pulp which is a fiber raw material
  • a chlorine-based bleaching agent such as chlorine, chlorine dioxide, or sodium hypochlorite
  • pulp is generally bleached with a chlorine-based bleaching agent such as chlorine, chlorine dioxide, or sodium hypochlorite in order to increase whiteness.
  • a chlorine-based bleaching agent such as chlorine, chlorine dioxide, or sodium hypochlorite
  • a toilet paper is generally manufactured from a fiber raw material obtained by mixing hardwood-derived pulp with a short fiber length and softwood-derived pulp with a long fiber length.
  • a toilet paper containing a large amount of hardwood-derived pulp that easily improves softness and a surface property is generally used.
  • pulp that has not been bleached with a chlorine-based bleaching agent contains a large amount of remaining lignin, and fibers thereof are hard.
  • a toilet paper containing this pulp as a main fiber raw material hardness and surface roughness are easily felt.
  • a main object of the present invention is to provide a toilet paper that provides a thick feeling that can make a user reassured during use thereof in a shower toilet, has sufficient softness, does not easily generate paper dust, has excellent water-disintegrability, and provides a security feeling to a human body during use thereof.
  • a first means to solve the above problems is a 3-ply or 4-ply toilet paper
  • the above present invention provides a toilet paper that provides a thick feeling that can make a user reassured during use thereof in a shower toilet, has sufficient softness, does not easily generate paper dust, has excellent water-disintegrability, and provides a security feeling to a human body during use thereof.
  • a toilet paper according to the present embodiment is a 3-ply or 4-ply product. That is, the toilet paper according to the present embodiment has three or four sheets stacked.
  • the toilet paper is a product of multi-ply exceeding 2-ply, such as a 3-ply or 4-ply product, the paper thickness of the entire paper is large while each ply is thin, and the paper can be hardly torn and can provide a security feeling while particularly "softness" is easily felt.
  • a 2-ply product hardly exhibits a thick feeling, and is likely to provide a poor security feeling when the paper absorbs a large amount of water and wipes the water after use in a shower toilet.
  • the toilet paper is a 5 or more-ply product, even if each ply is thin, softness is hardly felt when the skin is wiped with the toilet paper.
  • a 5 or more-ply product is used at the basis weight and the paper thickness per ply according to the present invention described later, and particularly an embossment is imparted to the toilet paper, strong rigidity is felt, and softness is hardly felt.
  • the basis weight of each ply is 10.5 g/m 2 or more and 12.5 g/m 2 or less.
  • the basis weight of each ply is preferably 10.6 g/m 2 or more and less than 12.4 g/m 2 , and more preferably 10.7 g/m 2 or more and 12.3 g/m 2 or less. If the basis weight of each ply is within this range, sufficient difficulty in tearing and favorable touch can be obtained when the above 3-ply or 4-ply product is used. In addition, water-disintegrability is easily exhibited.
  • the basis weight according to the present invention is measured by the basis weight measuring method of JIS P 8124 (1998).
  • the toilet paper according to the present invention needs to be made from softwood kraft pulp in which constituent main fibers, that is, 50% by mass or more of the constituent fibers are oxygen-pulped and non-chlorine-bleached.
  • the toilet paper according to the present invention is preferably made from softwood kraft pulp in which 80% by mass or more the constituent fibers are oxygen-pulped and non-chlorine-bleached, and particularly preferably softwood kraft pulp in which substantially 100% by mass of the constituent fibers without considering impurities and the like are oxygen-pulped and non-chlorine-bleached.
  • this softwood kraft pulp is also called NOKP, and is manufactured by continuously oxygen-pulping fibers in a continuous pulping pot, and particularly is not bleached with a chlorine-based bleaching agent thereafter.
  • kraft pulp (KP) used for a toilet paper includes a bleached one and an unbleached one, and an unbleached one contains a large amount of lignin.
  • the softwood kraft pulp according to the present invention has not been bleached with a chlorine-based bleaching agent, but has been oxygen-pulped (oxygen-delignified). Therefore, about half of the content of lignin has been removed from the softwood kraft pulp.
  • the chlorine-based bleaching agent means not only chlorine but also chlorine dioxide and sodium hypochlorite. Therefore, ECF pulp is not the above softwood kraft pulp according to the present invention.
  • the toilet paper according to the present invention contains 50% by mass or more, preferably 80 to 100% by mass or more of softwood kraft pulp that has not been bleached with a chlorine-based bleaching agent but has been delignified by oxygen-pulping.
  • the toilet paper is manufactured by using the softwood kraft pulp as a main fiber raw material, particularly as a whole fiber raw material. Therefore, the toilet paper provides a security feeling to a human body during use, and is environmentally friendly.
  • a toilet paper containing 50% by mass or more of the softwood kraft pulp is light brown, is likely to give a visual impression of a natural product that has not been chemically treated, and gives a soft impression. Therefore, the toilet paper provides a large security feeling to a purchaser thereof.
  • the toilet paper since the content of lignin has been reduced to about half of that before oxygen-pulping by the delignification treatment by oxygen-pulping. Therefore, the toilet paper exhibits softness more easily than a toilet paper containing pulp that has not been delignified at all as a raw material, and easily acquires a sufficient strength.
  • the content of hardwood kraft pulp that is likely to reduce water-disintegrability can be at least less than 50% by mass, and particularly 0% by mass. The toilet paper easily exhibits favorable water-disintegrability, and hardly generates paper dust.
  • softwood kraft pulp that contains lignin and has been oxygen-pulped and non-chlorine-bleached has a low fiber swelling property and a weak interfiber bond. Therefore, fibers are sparse, and water-disintegrability is favorable.
  • softwood kraft pulp is derived from softwood, and therefore has a longer fiber length than hardwood-derived pulp. Therefore, softwood kraft pulp hardly generates paper dust, and has an excellent cushioning property in combination with lignin's action of preventing fibers from being dense.
  • a fiber component other than oxygen-pulped and non-chlorine-bleached softwood kraft pulp is not necessarily limited. However, it is desirable that oxygen-pulped and non-chlorine-bleached hardwood kraft pulp is used because the oxygen-pulped and non-chlorine-bleached hardwood kraft pulp has a light brown appearance and provides a security feeling that bleaching with a chlorine-based bleaching agent has not been performed. Virgin pulp or used paper pulp other than the oxygen-pulped and non-chlorine-bleached hardwood kraft pulp may be used.
  • fibers in used paper pulp tend to be finer than pulp fibers before regeneration, and due to such a nature of the fibers, the fibers easily become dense without increasing a paper thickness, and paper strength easily increases. Meanwhile, if an excessive amount of used paper pulp is blended, texture such as flexibility is reduced. Therefore, in consideration of the characteristics of used paper pulp, the blending ratio thereof only needs to be set within a range of 0 to less than 20% by mass. Note that the type of used paper pulp is not necessarily limited. Used paper pulp made from milk carton used paper or high-quality used paper can be used.
  • the toilet paper according to the present invention can be a toilet paper that provides an excellent thick feeling, has excellent water-disintegrability, has sufficient softness, hardly generates paper dust, provides a security feeling to a human body during use, and is environmentally friendly by containing 50 to 100% by mass of oxygen-pulped and non-chlorine-bleached softwood kraft pulp, having a basis weight of 10.5 to 12.5 g/m 2 per ply, and being formed into a multi-ply product such as a 3-ply or 4-ply product.
  • the toilet paper according to the present invention is a non-moisturizer-applied paper to which a moisturizer has not been externally applied substantially.
  • the moisturizer as an external additive according to the present invention is a polyol, examples of which include at least glycerin, diglycerin, propylene glycol, 1,3-butylene glycol, and polyethylene glycol.
  • inclusion of the above component is not denied as long as the content of the above component is so small that an influence thereof is at a level not being worthy of a moisturizing toilet paper.
  • the toilet paper according to the present invention provides an excellent security feeling to a human body. When a moisturizer is applied to the toilet paper, stickiness and moist feeling peculiar to the moisturizer are felt, and therefore the above security feeling to a human body is reduced.
  • the toilet paper according to the present invention contains a softener that determines softness and paper strength of a base paper itself, the softener being internally added during papermaking.
  • the softener contained in the toilet paper according to the present invention is a cationic fatty acid amide-based softener.
  • the cationic fatty acid amide-based softener does not reduce an effect due to inclusion of lignin, and acts to coat surfaces of the fibers. Even if the toilet paper contains a large amount of pulp containing lignin, the toilet paper has a smooth surface, remarkably reduces a stiff feeling, and enhances a fullness.
  • the cationic fatty acid amide-based softener is a reaction product between an amide-based compound obtained by a reaction between a polyalkylene polyamine and a monocarboxylic acid, and epihalohydrin. An effect is exhibited if this cationic fatty acid amide-based softener is used.
  • the reaction product between an amide-based compound obtained by a reaction between a polyalkylene polyamine and a monocarboxylic acid, and epihalohydrin is internally added, the product is preferably mixed with an emulsifier having an alkyl group and/or an alkenyl group having 4 to 20 carbon atoms, and water and added.
  • the content of the cationic fatty acid amide-based softener is not necessarily limited. However, when a fixing ratio is 50 to 60%, the amount thereof added during manufacturing only needs to be 0.5 to 4.0 kg/pulp t.
  • a softening moisturizer is internally added to the toilet paper. It is desirable that the content thereof is 0.2 to 2.0 kg/pulp t.
  • a particularly preferable softening moisturizer is a reaction product obtained by causing a compound obtained by adding an alkylene oxide having 2 to 4 carbon atoms to active hydrogen of a polyalkyleneimine having a weight average molecular weight of 500 to 10,000 to react with a higher fatty acid having 12 to 24 carbon atoms and/or an ester compound of a higher fatty acid having 12 to 24 carbon atoms. By inclusion of this softening moisturizer, softness is further improved.
  • each ply has a paper thickness of 80 to 100 um, and the toilet paper has an overall paper thickness of 320 to 400 um.
  • the paper thickness of the toilet paper is obtained by sufficiently (usually for about eight hours) subjecting a test piece to humidity control under conditions of JIS P 8111 (1998), and then measuring the paper thickness in a 1-ply state using a dial thickness gauge (thickness measuring instrument) "PEACOCK G type" (manufactured by Ozaki MFG. Co. Ltd.) under the same conditions.
  • the plunger is placed on the measuring table, a scale of the dial thickness gauge is moved to adjust a zero point, then the plunger is raised, a sample is placed on a test table, the plunger is lowered slowly, and the current gauge is read.
  • measurement is performed such that one constituent concave (convex) is necessarily within a range of the measuring table. Note that when there are concaves with different depths, measurement is performed such that the deepest concave is located within the range of the measuring table. During this measurement, the plunger is only placed and not pressed.
  • a terminal of the plunger is made of metal, and a circular plane thereof with a diameter of 10 mm strikes perpendicularly to a paper plane, and a load is about 70 gf when the paper thickness is measured.
  • the paper thickness is an average of values obtained by performing the measurement 10 times.
  • crushing of an embossment (concave) is assumed, but the paper thickness according to the present invention is a value measured including such crushing, and such crushing may be ignored.
  • a difference in paper thickness caused by crushing of a concave can be ignored.
  • the toilet paper contains pulp fibers that is not unbeaten. It is desirable that the beating degree of a papermaking raw material during manufacturing is not necessarily limited, but it is desirable to beat the papermaking raw material such that a down width of the Canadian standard freeness is 20cc to 50cc. This down width is much smaller than the beating width of a general papermaking raw material. In this case, the Canadian standard freeness of the papermaking raw material is approximately 600 cc or more.
  • the toilet paper may be embossed.
  • An emboss pattern thereof is not necessarily limited.
  • An embossment can be an appropriate emboss pattern such as a micro-embossment, a dot-shaped embossment, or a design embossment.
  • it is desirable that the emboss pattern according to the present invention is imparted in a ply stacked state called a single embossment.
  • a suitable emboss pattern has a concave area of 1.0 to 2.5 mm 2 , a density of 5.0 to 50 pieces/cm 2 , and an embossment depth of 0.05 to 0.5 mm.
  • Softness of the toilet paper is improved, and softness in a rolled state like a toilet roll is increased, which makes a consumer easily feel that the toilet paper is soft when the consumer holds the toilet paper in his/her hand.
  • the depth of embossing is measured by a one-shot 3D measurement macroscope VR-3200 manufactured by KEYENCE CORPORATION or its equivalent machine, and image analysis software "VR-H1A" or its equivalent software. Measurement is performed under conditions of a magnification of 12 times and a visual field area of 24 mm ⁇ 18 mm. However, the magnification and the visual field area can be appropriately changed depending on the size of an embossment (concave). A specific measurement procedure will be described with reference to Fig. 2 .
  • an embossment depth (measurement cross-sectional curve) profile at a line segment Q1 crossing the longest portion of a peripheral edge of one embossment (concave) 40 in an image portion (X portion in the drawing) illustrated by a plane viewpoint is obtained.
  • a "contour curve Q2" of an image portion (Y portion in the drawing) illustrated by a cross-sectional viewpoint is obtained by removing a component of surface roughness having a shorter wavelength than Ac: 800 um (provided that Xc is the "filter that defines a boundary between a roughness component and a waviness component" described in JIS-B0601 "3.1.1.2") from the cross-sectional curve of this embossment depth profile with a low pass filter.
  • a contour E in the image illustrated by a plane viewpoint of the embossment (concave) 40 during the measurement may be referred to.
  • the depth of an embossment (concave) is measured for the shortest portion in a direction perpendicular to the longest portion, and a larger value is adopted as the depth of the embossment (concave).
  • the above measurement is performed for any 10 embossments on a surface of the toilet paper, and an average value thereof is defined as a final embossment depth.
  • a contour of an embossment concave is visually confirmed from a 3D image obtained by measurement with a one-shot 3D measurement macroscope VR-3200 or its equivalent machine and image analysis software "VR-H1A" or its equivalent software, and an area inside the contour is measured.
  • the above measurement is performed for any 10 embossments on a surface of the toilet paper, and an average value thereof is defined as a final area of the embossment concave.
  • the toilet paper according to the present invention has water-disintegrability of 10 seconds or less, which is very fast. This is because 50% by mass or more, preferably 80% by mass or more, particularly 100% by mass of the constituent fibers is softwood kraft pulp containing lignin, and the fibers are easily loosened. If water-disintegrability is within 10 seconds, a risk of clogging a pipe is remarkably reduced when the toilet paper is discarded into running water in a flush toilet or the like. This water-disintegrability (easiness of loosening) is measured according to JIS P 4501 (1993).
  • a 300 mL beaker containing 300 mL of water (water temperature 20 ⁇ 5°C) is placed on a magnetic stirrer, and the rotation speed of a rotor is adjusted to 600 ⁇ 10 revolutions/minute.
  • a test piece of a 100 ⁇ 2 mm square is put into the beaker, and a stopwatch is pressed.
  • the rotation speed of the rotor once drops to about 500 revolutions due to a resistance of the test piece, and rises as the test piece is loosened. When this rotation speed recovers to 540 revolutions, the stopwatch is stopped, and the time is measured in units of one second.
  • a result of easiness of loosening is expressed by an average of results of five tests.
  • the rotor has a disk shape having a diameter of 35 mm and a thickness of 12 mm.
  • the toilet paper has a longitudinal dry tensile strength of 500 cN/25 mm or more and 1200 cN/25 mm or less, more preferably 600 cN/25 mm or more and 1000 cN/25 mm or less. It is desirable that the toilet paper has a lateral dry tensile strength of 200 cN/25 mm or more and 450 cN/25 mm or less, more preferably 200 cN/25 mm or more and 350 cN/25 mm or less. If the dry tensile strength is within this range, the toilet paper is sufficiently durable for use.
  • the longitudinal direction of paper is also referred to as MD (Machine Direction) and is a flow direction during papermaking.
  • the lateral direction of paper is also referred to as CD (Cross Direction), and is a direction perpendicular to a flow direction (MD) during papermaking.
  • the dry tensile strength is a value measured based on JIS P 8113 (2006), and is measured as follows.
  • As a test piece a tissue paper cut into a size of about 25 mm ( ⁇ 0.5 mm) (width) ⁇ about 150 mm (length) in both MD and CD is used. The test piece is measured in a state of multiple plies.
  • As a tester a load cell tensile tester TG-200N manufactured by Minebea Co., Ltd.
  • a grip interval is set to 100 mm
  • a tensile speed is set to 100 mm/min.
  • the measurement is performed by tightening both ends of the test piece to a grip of the tester, applying a tensile load to the paper piece in an up-down direction, and reading an indicated value (a digital value when the value is indicated by the digital value) when the paper breaks.
  • Five sets of samples are prepared in each of MD and CD, and each sample is measured five times. An average of the measured values is defined as a dry tensile strength in each of the directions.
  • the toilet paper has a wet tensile strength in MD of 50 cN/25 mm or more and 100 cN/25 mm or less. It is desirable that the toilet paper has a wet tensile strength in CD of 15 cN/25 mm or more and 70 cN/25 mm or less.
  • the wet tensile strength is a value measured based on JIS P 8135 (1998), and is measured as follows. As a test piece, a tissue paper cut into a size of about 25 mm ( ⁇ 0.5 mm) (width) ⁇ about 150 mm (length) in both MD and CD is used. A multi-ply tissue paper is measured in a state of multiple plies.
  • a load cell tensile tester TG-200N manufactured by Minebea Co., Ltd. and its equivalent machine are used as a tester. Note that a grip interval is set to 100 mm, and a tensile speed is set to 50 mm/min.
  • the test piece used has been cured for 10 minutes in a dryer at 105°C. The measurement is performed by tightening both ends of the test piece to a grip of the tester, then horizontally imparting water to a central portion of the test piece with a width of about 10 mm using a flat brush containing water, immediately thereafter applying a tensile load to the paper piece in an up-down direction, and reading an indicated value (digital value) when the paper breaks.
  • the toilet paper has an MMD value of 7.5 or more and 11.0 or less, which is an indicator indicating a surface property.
  • MMD is less than 7.5, the surface is too smooth, and a wiping property deteriorates.
  • MMD exceeds 11.0, the toilet paper may have poor touch and may be unsuitable for use as a toilet paper.
  • the friction element is formed by adjoining 20 piano wires P each having a diameter of 0.5 mm, and has a contact surface formed such that the length and the width are both 10 mm. On the contact surface, a unit bulging portion having a tip formed with 20 piano wires P (radius of curvature: 0.25 mm) is formed.
  • the toilet paper of the present embodiment has Softness of 2.0 cN/100 mm or more and 3.5 cN/100 mm or less.
  • Softness is one of indicators of softness, in which paper is softer as the paper has a lower value of Softness.
  • a tissue paper or a toilet paper having Softness of 3.5 cN/100mm or less is evaluated to be soft.
  • Softness is a value measured based on a handle-o-meter method according to the JIS L 1096 E method (1990). However, a test piece has a size of 100 mm ⁇ 100 mm, and a clearance is set to 5 mm.
  • a 1-ply product is measured five times in each of MD and CD, and an average of the total 10 values is defined as Softness. Softness is unitless, but may be expressed in units of cN/100 mm considering the size of a test piece.
  • the dry tensile strength and the wet tensile strength can be adjusted without using a paper strength agent such as a dry paper strength enhancer or a wet paper strength enhancer.
  • a paper strength agent such as a dry paper strength enhancer or a wet paper strength enhancer.
  • the toilet paper contains no paper strength agent from a viewpoint of a user's security feeling.
  • a large amount (80% by mass or more, particularly 100% by mass) of softwood kraft pulp having a long fiber length in the toilet paper entanglement between the fibers is ensured, and sufficient strength for use can be achieved even if the toilet paper contains no paper strength agent.
  • the toilet paper contains lignin, and therefore also has excellent water-disintegrability. That is, sufficient strength can be ensured without using a paper strength agent, and excellent water-disintegrability can be further achieved.
  • the toilet paper of the present embodiment does not use a dry paper strength enhancer or a wet paper strength enhancer as described above, but the toilet paper may use the dry paper strength enhancer or the wet paper strength enhancer as necessary as long as water-disintegrability is not impaired.
  • the dry paper strength enhancer here include starch, polyacrylamide, and carboxymethyl cellulose (CMC) or salt thereof such as sodium carboxymethyl cellulose, calcium carboxymethyl cellulose and zinc carboxymethyl cellulose.
  • wet paper strength enhancer examples include a polyamide polyamine epichlorohydrin resin, a urea resin, an acid colloid/melamine resin, heat-crosslinkable coating PAM, TS-20 manufactured by Seiko PMC Corporation, a polymer aldehyde-functional compound such as glioxylated polyacrylamide and cationic glioxylated polyacrylamide, a copolymer of an acrylamide monomer modified with a divalent aldehyde of glyoxal and another copolymerizable unsaturated monomer, and dialdehyde starch.
  • a polyamide polyamine epichlorohydrin resin a urea resin, an acid colloid/melamine resin, heat-crosslinkable coating PAM, TS-20 manufactured by Seiko PMC Corporation
  • a polymer aldehyde-functional compound such as glioxylated polyacrylamide and cationic glioxylated polyacrylamide
  • the toilet paper of the present embodiment may have a sheet-like shape.
  • the toilet paper is suitably in a form of a toilet roll obtained by winding a belt-shaped toilet paper 10 around a paper tube (also referred to as a tube core) 20 into a roll shape.
  • the toilet roll has a winding diameter L2 (diameter) of 110 to 115 mm.
  • the winding diameter of the toilet roll is defined as 120 mm or less in JIS P 4501, and a holder for setting a general toilet roll is created based on this 120 mm.
  • the toilet roll has a winding diameter of 110 to 115 mm, and has a size that can be sufficiently set in a general holder.
  • the winding diameter is a value measured using a diameter rule manufactured by Muratec KDS Corporation or its equivalent machine. An average of measured values at three different locations in a width direction is used as a measured value. Note that an average value for five rolls is used as an average value for products in the same manufacturing lot.
  • the toilet roll has a winding length of 20 to 40m and a winding density of 0.20 to 0.30 m/cm 2 at this time.
  • the winding density here is a value calculated by winding length (m)/actual cross-sectional area.
  • the actual cross-sectional area is a value calculated by ⁇ (winding diameter/2) ⁇ (winding diameter/2) ⁇ ⁇ - (paper tube outer diameter/2) ⁇ (paper tube outer diameter/2) ⁇ n ⁇ (unit: cm 2 ). That is, the actual cross-sectional area is an area obtained by subtracting the area of the paper tube on an opening end side from the area of an end surface.
  • a paper tube outer diameter (paper tube diameter) L3 is 35 to 45 mm ⁇ , which is similar to a general size.
  • the toilet paper has a roll winding tightness of 1.8 to 3.0 mm.
  • a "handy compression tester KES-G5" manufactured by Kato Tech Co., Ltd. is used to measure the roll winding tightness (mm) (T0 - TM).
  • a toilet roll TR is placed horizontally on a horizontal pedestal made of a steel plate such that a central axis of the toilet roll TR is horizontal.
  • a steel plate terminal having a circular plane with a compression area of 2 cm 2 is brought into contact with the center of an upper surface of an outer periphery of a roll trunk. With this contacted state as a zero point, the steel plate terminal is moved vertically downward at a speed of 10 mm/min from the zero point to compress the toilet roll.
  • T0 - TM (mm) is defined as a roll winding tightness (mm), in which T0 (mm) represents the amount of pushing when a compression load is 0.5 gf/cm 2 , and TM (mm) represents the amount of pushing when the compression load is 50 gf/cm 2 .
  • the toilet roll has a compression work amount (WC) of 3.5 to 5.5 gf ⁇ cm/cm 2 .
  • the compression work amount (WC) is a work amount from a time point when a steel plate terminal is brought into contact with a roll at 0.5 gf/cm 2 to a time point of pushing at a maximum load of 50 gf/cm 2 .
  • the toilet paper contains oxygen-pulped and non-chlorine-bleached softwood kraft pulp containing lignin and having a long fiber length in an amount of 50% by mass or more of fibers, in which a bond between the fibers is moderately weak. Therefore, when the toilet paper is formed into the above roll form, the toilet paper has an excellent cushioning property, and softness is easily felt when the toilet paper is held in the hand as described above.
  • Reference Example has a general fiber structure equivalent to a product using pulp bleached with chlorine-based bleaching agent, which is also called a bleached product, and contains a larger amount of LBKP, which is hardwood pulp, than NBKP, which is softwood pulp.
  • Comparative Examples 5 and 6 are commercially available products each containing unbleached pulp. In Comparative Examples 1 to 3, the basis weight and the paper thickness are particularly higher than those in Examples.
  • An embossment of each of Reference Example, Examples, and Comparative Examples 1 to 4 had the pattern illustrated in Fig. 1 .
  • Comparative Example 3 was evaluated as 4 points (median), and scoring was performed from 7 points for a good evaluation to 1 point for a poor evaluation with a difference for one point up or down, and an average value thereof was calculated for judgement.
  • Examples of the present invention show much better sensory evaluation results than Comparative Examples 5 to 7, which are conventional unbleached products, in “softness”, “fullness”, “thick feeling”, “tear and strength during use”, and “how small the paper dust amount during use is”.
  • Examples of the present invention show sensory evaluation results equivalent to or higher than the bleached product (Reference Example) in “softness”, “fullness”, “thick feeling”, “tear and strength during use”, and “how small the paper dust amount during use is”.
  • each of Examples of the present invention uses softwood pulp having a long fiber length as 100% by mass raw material pulp, and has high freeness, but obtained sensory evaluation results equivalent to or higher than the bleached product (Reference Example) using a papermaking raw material containing a large amount of LBKP with a short fiber length and having a low freeness. That is, each of Examples of the present invention has quality equivalent to the bleached product (Reference Example) while providing a security feeling provided by the unbleached product.
  • Example 1 is compared with Comparative Examples 1 to 4, it is evaluated that paper dust is much less likely to be generated in Example 1.
  • the compression work amount was larger than those in Reference Example and Comparative Examples, and more softness was felt when the toilet paper in the roll form was held in the hand.
  • the toilet paper according to the present invention provides a thick feeling that can make a user reassured during use thereof in a shower toilet, has sufficient softness, does not easily generate paper dust, has excellent water-disintegrability, and provides a security feeling to a human body during use thereof.

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sanitary Thin Papers (AREA)
  • Paper (AREA)

Claims (1)

  1. Ein 3-lagiges oder 4-lagiges Toilettenpapier, umfassend:
    sauerstoffaufgeschlossenen und chlorfrei gebleichten Weichholz-Kraftzellstoff in einer Menge von 50 bis 100 Massenprozent Fasern; und
    einen kationischen Weichmacher auf Fettsäureamidbasis,
    wobei jede Lage ein Flächengewicht von 10,5 bis 12,5 g/m2 und eine Dicke von 80 bis 100 µm aufweist, und
    das Toilettenpapier eine Gesamtdicke von 320 bis 400 um und eine Wasser-Desintegrabilität von 10 Sekunden oder weniger aufweist.
EP20766224.8A 2019-03-06 2020-02-12 Toilettenpapier Active EP3907328B1 (de)

Applications Claiming Priority (2)

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JP2019040905A JP7175801B2 (ja) 2019-03-06 2019-03-06 トイレットペーパー
PCT/JP2020/005222 WO2020179379A1 (ja) 2019-03-06 2020-02-12 トイレットペーパー

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EP3907328A1 EP3907328A1 (de) 2021-11-10
EP3907328A4 EP3907328A4 (de) 2022-10-05
EP3907328B1 true EP3907328B1 (de) 2023-12-06

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WO (1) WO2020179379A1 (de)

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CN116590951A (zh) * 2023-04-26 2023-08-15 维达护理用品（中国）有限公司 一种蓬松原纸的制备方法

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US12091820B2 (en) * 2020-10-09 2024-09-17 Kimberly-Clark Worldwide, Inc. Embossed tissue

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JP7175801B2 (ja) 2022-11-21
KR102683635B1 (ko) 2024-07-09
JP2020141870A (ja) 2020-09-10
US20220127790A1 (en) 2022-04-28
WO2020179379A1 (ja) 2020-09-10
EP3907328A1 (de) 2021-11-10
EP3907328A4 (de) 2022-10-05
KR20210134645A (ko) 2021-11-10
CN113330158A (zh) 2021-08-31
CN113330158B (zh) 2022-11-15

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