WO2020179379A1 - Papier hygiénique - Google Patents

Papier hygiénique Download PDF

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Publication number
WO2020179379A1
WO2020179379A1 PCT/JP2020/005222 JP2020005222W WO2020179379A1 WO 2020179379 A1 WO2020179379 A1 WO 2020179379A1 JP 2020005222 W JP2020005222 W JP 2020005222W WO 2020179379 A1 WO2020179379 A1 WO 2020179379A1
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WO
WIPO (PCT)
Prior art keywords
paper
toilet paper
toilet
thickness
pulp
Prior art date
Application number
PCT/JP2020/005222
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English (en)
Japanese (ja)
Inventor
秀太 保井
穣 岩崎
Original Assignee
大王製紙株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 大王製紙株式会社 filed Critical 大王製紙株式会社
Priority to US17/436,145 priority Critical patent/US20220127790A1/en
Priority to KR1020217027641A priority patent/KR102683635B1/ko
Priority to EP20766224.8A priority patent/EP3907328B1/fr
Priority to CN202080010190.9A priority patent/CN113330158B/zh
Publication of WO2020179379A1 publication Critical patent/WO2020179379A1/fr

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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
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to toilet paper.
  • Toilet paper suitable for shower toilets is preferred to be a multi-ply product such as 3 ply or 4 ply because it is easy for consumers to feel secure when using it.
  • toilet paper is generally bleached from pulp, which is a fiber raw material, with chlorine, chlorine dioxide, and chlorine bleaching chemicals such as sodium hypochlorite in order to increase whiteness.
  • pulp which is a fiber raw material
  • chlorine bleaching chemicals such as sodium hypochlorite
  • Toilet paper is generally produced from a fiber raw material in which pulp derived from hardwood with a short fiber length and pulp derived from softwood with a long fiber length are mixed, and mainly obtained from hardwood-derived pulp that easily improves softness and surface properties. It is common to include many.
  • pulp that has not been bleached with chlorine-based bleaching chemicals has a large amount of lignin remaining, and the fibers are hard, and toilet paper that uses this as the main fiber raw material tends to feel hardness and surface roughness.
  • the main problem of the present invention is that while having a thickness feeling that can be relieved in a situation where it is used in a shower toilet, softness is sufficient and paper dust is unlikely to occur, and it is also excellent in water disintegration, to the human body during use. It is to provide toilet paper with a sense of security.
  • the first means to solve the above problems is 3-4 ply toilet paper, 50-100% by mass of fiber is oxygen-evaporated and chlorine-bleached softwood kraft pulp. Contains cationic fatty acid amide softener, The basis weight of one ply is 10.5-12.5 g/m 2 , The paper thickness of one ply is 80 to 100 ⁇ m, and the paper thickness of the entire toilet paper is 320 to 400 ⁇ m, Hydrolyzability is 10 seconds or less, It is a toilet paper characterized in that.
  • the softness is sufficient and paper dust is less likely to be generated, and further excellent in water disintegration, to the human body during use.
  • Toilet paper with a sense of security is provided.
  • the toilet paper according to this embodiment is 3-ply or 4-ply. That is, three or four sheets are stacked.
  • the overall paper thickness becomes thick while making each ply thin, making it especially easy to feel "softness” and secure against tearing. It can be made to have a feeling.
  • the thickness of 2 plies is less likely to give rise to a feeling of thickness, and it tends to lack a sense of security when wiping off while absorbing a large amount of water after using a shower toilet. If the number of plies is 5 or more, even if each ply is thinned, it becomes difficult to feel the softness when the skin is wiped. Further, when the basis weight and paper thickness per ply according to the present invention to be described later are 5 plies or more, and particularly embossing is given, a strong feeling of rigidity is felt and softness is hardly felt.
  • the basis weight per ply is 10.5 g/m 2 or more and 12.5 g/m 2 or less.
  • the grammage according to the present invention is based on the grammage measuring method of JIS P 8124 (1998).
  • the main fibers of the constituent fibers must be softwood kraft pulp that has been digested with oxygen and not bleached with chlorine.
  • 80% by mass or more, and particularly preferably substantially 100% by mass without considering impurities and the like is a softwood kraft pulp that has been digested with oxygen and has not been bleached with chlorine. More specifically, this softwood kraft pulp is also referred to as NOKP, and is produced by continuously performing oxygen digestion in a continuous digester, and is not subjected to bleaching treatment with a chlorine bleaching chemical after that.
  • KP kraft pulp
  • used for toilet paper includes bleached ones and unbleached ones, and unbleached ones contain 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 undergone oxygen digestion (oxygen delignification), and thus about half of the lignin has been removed.
  • the chlorine-based bleaching chemical is meant to include not only chlorine but also chlorine dioxide and sodium hypochlorite. Therefore, the ECF pulp is not the 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 been unbleached with a chlorine-based bleaching agent but has been delignin-treated by oxygen cooking.
  • softwood kraft pulp is manufactured mainly as a fiber raw material, particularly as a whole fiber raw material, it is safe for the human body during use and is environmentally friendly.
  • the toilet paper containing 50% by mass or more of such softwood kraft pulp is light brown, it tends to give the impression that it is a natural product that has not been chemically treated, and that it has a soft impression. , The purchaser is very reassured. ..
  • the softness is more likely to be expressed than the pulp which is not subjected to the delignification treatment as a raw material. It is easy to make it strong. Further, the hardwood kraft pulp, which tends to have low water decomposability, can be at least less than 50% by mass, particularly 0% by mass, and the water decomposability can be easily improved, and paper dust hardly occurs.
  • lignin is not hydrophilic, oxygen-digested, non-chlorine-bleached softwood kraft pulp has low fiber swelling and weak interfiber bonding. For this reason, the fibers become sparse and the water decomposability becomes good. Furthermore, since softwood kraft pulp is derived from softwood, it has a longer fiber length than pulp derived from hardwood, so that paper dust is less likely to be generated, and lignin has an action of preventing the fibers from becoming dense, resulting in excellent cushioning properties. ..
  • Fiber components other than oxygen-evaporated and chlorine-bleached coniferous kraft pulp are not necessarily limited, but are oxygen-evaporated because they give a light brown appearance and give a sense of security that they have not been bleached with chlorine bleach.
  • Hardwood kraft pulp, unbleached with chlorine is preferred.
  • Other virgin pulp or used paper pulp may be used.
  • Waste paper pulp tends to be finer than pulp fiber before recycling in the process of recycling pulp from waste paper, and due to the nature of such fibers, the fibers become dense without thickening the paper thickness. Paper power tends to increase. On the other hand, if it is blended excessively, the texture such as flexibility is deteriorated. Therefore, in view of the characteristics of waste paper pulp, its blending ratio may be set in the range of 0 to less than 20% by mass.
  • the type of used paper pulp is not necessarily limited. Milk carton waste paper and waste paper pulp made from high-quality waste paper can be used.
  • the toilet paper according to the present invention contains 50 to 100% by mass of oxygen-evaporated and chlorine-bleached unbleached softwood kraft pulp, and has a low basis weight of 1 ply of 10.5-12.5 g / m 2, and further contains 3 plies or
  • the 4-ply multi-ply has excellent thickness and water decomposability, has sufficient softness, does not easily generate paper dust, has a feeling of safety to the human body during use, and is an environmentally friendly toilet. It can be a paper.
  • the toilet paper according to the present invention is one in which no moisturizer is applied externally.
  • the humectant as an external additive according to the present invention is a polyol, and at least glycerin, diglycerin, propylene glycol, 1,3-butylene glycol and polyethylene glycol are included.
  • the toilet paper according to the present invention has an excellent sense of security for the human body, and when a moisturizer is applied, a sticky feeling and a moist feeling peculiar to the moisturizer are felt. descend.
  • the toilet paper according to the present invention contains a softener that determines the softness and paper strength of the base paper itself that is 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 softener does not reduce the effect due to the inclusion of lignin, and acts to coat the fiber surface. Even if the pulp containing lignin is highly blended, the surface is smooth, the feeling of stiffness is significantly reduced, and the feeling of softness is also enhanced.
  • a specific example of the cationic fatty acid amide-based softening agent is preferably a reaction product of epihalohydrin with an amide-based compound obtained by the reaction of polyalkylene polyamines and monocarboxylic acids. If this cationic fatty acid amide softener is used, the effect will be exhibited.
  • an amide compound obtained by the reaction of polyalkylene polyamines with monocarboxylic acids and a reaction product of epihalohydrin are internally added, an emulsifier having an alkyl group and / or an alkenyl group having 4 to 20 carbon atoms is used. , And it is better to mix with water and add.
  • the content of the cationic fatty acid amide-based softening agent is not necessarily limited, but when the fixing ratio is 50 to 60%, the addition amount at the time of production may be 0.5 to 4.0 kg/pulp t.
  • the toilet paper according to the present invention preferably has a soft moisturizer internally added.
  • the content is preferably 0.2 to 2.0 kg/pulp t.
  • a soft moisturizer flexibility is improved.
  • a particularly preferable softening agent is a compound obtained by adding an alkylene oxide having 2 to 4 carbon atoms to active hydrogen of polyalkyleneimine having a weight average molecular weight of 500 to 10,000, and a higher fatty acid having 12 to 24 carbon atoms and And/or a reaction product obtained by reacting an ester compound of a higher fatty acid having 12 to 24 carbon atoms.
  • this soft moisturizer the softness is further improved.
  • the toilet paper according to the present invention has a one-ply paper thickness of 80 to 100 ⁇ m, and a total toilet paper thickness of 320 to 400 ⁇ m. When the paper thickness is within this range, it is excellent in softness and softness, and you can get a reliable thickness feeling.
  • the test piece is sufficiently adjusted under the conditions of JIS P8111 (1998) (usually about 8 hours), and then the dial thickness gauge (thickness measuring instrument) is used under the same conditions. It shall be measured in the state of 1 ply using "PEACOCK G type" (manufactured by Ozaki Seisakusho). Specifically, check that there is no dust, dust, etc.
  • the terminal of the plunger is made of metal so that a circular flat surface having a diameter of 10 mm hits the plane of the paper perpendicularly, and the load at the time of measuring the paper thickness is about 70 gf.
  • the paper thickness is an average value obtained by performing the measurement 10 times.
  • crushing of the emboss concave portion
  • the paper thickness according to the present invention is a value measured including such crushing, and such crushing is ignored. Good. In this paper thickness measurement, the paper thickness difference caused by the collapse of the concave portion can be ignored.
  • the toilet paper according to the present invention contains pulp fibers that are not unbeaten.
  • the beating degree of the papermaking raw material at the time of production is not necessarily limited, but it is desirable that the Canadian standard freeness is beaten so that the down width is 20 cc to 50 cc. This down width is much smaller than the beating width of general papermaking materials. In this case, the Canadian standard drainage degree of the papermaking raw material is approximately 600 cc or more.
  • the softening agent is easily fixed on the fiber surface when internally added to contain the above-mentioned softening agent, and the fibers are Becomes moderately entangled, tends to have a low desired paper thickness, is excellent in softness, and has a good fluffy feeling. On top of that, paper dust is extremely unlikely to be generated. Further adjustment of paper thickness can be further made by crepe rate.
  • the toilet paper according to the present invention may be embossed.
  • the embossing pattern is not always limited.
  • the embossing can be an appropriate embossing pattern such as micro embossing, dot type embossing, design embossing and the like.
  • the embossing pattern according to the present invention is an embossing applied in a ply laminated state called a single embossing.
  • a suitable embossing pattern according to the present invention has a recess area of 1.0 to 2.5 mm 2 , a density of 5.0 to 50 pieces / cm 2 , and an embossing depth of 0.05 to 0.5 mm. is there.
  • the softness as a toilet paper is improved, and the softness in a roll state like a toilet roll is increased, and it becomes easy for a consumer to feel soft when it is held in a hand.
  • the concave portions 32 each of which has a substantially square shape (FIG.
  • the valley line portions 33 that are arranged and extend from the four directions of the recesses are provided between the recesses 31 (32) and the recesses 31 (32). It is desirable that the valley line portion 33 is gradually and gently arranged in a cross-sectional arch so that the four directions of the recesses 31 (32) are the deepest and the middle between the recesses is the shallowest. This embossed pattern is excellent in softness and stool wipeability.
  • the depth of embossing is measured with 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.
  • the measurement is performed under the conditions of a magnification of 12 times and a visual field area of 24 mm ⁇ 18 mm.
  • the magnification and the viewing area can be appropriately changed depending on the size of the embossing (recess).
  • a specific measurement procedure will be described with reference to FIG. 2. Using the software described above, the longest part of the peripheral edge of one emboss (recess) 40 in the image part (X part in the drawing) shown in a plan view is determined.
  • ⁇ c 800 ⁇ m (however, ⁇ c is shorter than the “filter that defines the boundary between the roughness component and the waviness component” described in JIS-B0601 “3.1.1.2”).
  • the "contour curve Q2" of the image portion (Y portion in the figure) shown by the cross-sectional viewpoint obtained by removing the component of the surface roughness of the wavelength the two that are convex upward and have the strongest bending
  • the minimum value between the concave edge points P1 and P2 and the concave edge points P1 and P2 is obtained, and the minimum depth is set to Min.
  • the depth of the emboss is measured for the shortest part in the direction perpendicular to the longest part, and the larger value is adopted as the depth of the emboss (recess).
  • the above measurement is performed for any 10 embosses on the surface of the toilet paper, and the average value thereof is used as the final emboss depth.
  • each recess of the embossed pattern is also visually observed from the one-shot 3D measurement macroscope VR-3200 or its equivalent machine and the 3D image obtained by measuring with the image analysis software "VR-H1A" or its equivalent software. Check the contour of the embossed recess and measure the area inside the contour. The process is performed for any 10 embosses on the surface of the toilet paper, and the average value is used as the final embossed recess area.
  • the toilet paper according to the present invention has a water degradability of 10 seconds or less, which is extremely fast. This is because 50% by mass or more, preferably 80% by mass or more, and particularly 100% by mass of the constituent fibers is softwood kraft pulp containing lignin, and the fibers are easily loosened. If the water solubility is within 10 seconds, the risk of clogging the pipes when running water is disposed of in a flush toilet or the like is further reduced. The measurement of this water decomposability (easiness of loosening) is according to JIS P4501 (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 the rotor is adjusted to 600 ⁇ 10 rotations/minute. Insert a test piece with a side of 100 ⁇ 2 mm into it and press the stopwatch. The rotation speed of the rotor once drops to about 500 rotations due to the resistance of the test piece, and the rotation speed increases as the test piece is loosened. The stopwatch is stopped when the number of revolutions is recovered to 540, and the time is measured in units of 1 second. The result of ease of unraveling is expressed by the average of 5 tests.
  • the rotor has a disk shape with a diameter of 35 mm and a thickness of 12 mm.
  • the toilet paper according to the present invention preferably has a dry tensile strength in the vertical direction 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.
  • the dry tensile strength in the transverse direction is preferably 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. Within this range, it can be sufficiently used.
  • the longitudinal direction of paper is also called the MD direction, and is the flow direction during papermaking.
  • the lateral direction of the paper is also called the CD direction, and is a direction orthogonal to the flow direction (MD direction) at the time of papermaking.
  • the dry tensile strength according to the present invention is a value measured based on JIS P8113 (2006), and is measured as follows.
  • As the test piece a test piece cut into a width of 25 mm ( ⁇ 0.5 mm) and a length of 150 mm is used in both the vertical and horizontal directions. The test piece is measured with multiple plies.
  • As the tester a load cell tensile tester TG-200N manufactured by Minebea Co., Ltd. and an equivalent machine are used.
  • the gripping interval is set to 100 mm, and the tensile speed is set to 100 mm / min.
  • the measurement is performed by tightening both ends of the test piece to the grips of the tester, applying a tensile load to the paper piece in the vertical direction, and reading the indicated value when the paper breaks (the digital value if indicated by a digital value). .. Five sets of samples are prepared in each of the longitudinal direction and the transverse direction, and the measurement is performed 5 times each, and the average of the measured values is taken as the dry tensile strength in each direction.
  • the toilet paper according to the present invention preferably has a wet tensile strength in the longitudinal direction of 50 cN/25 mm or more and 100 cN/25 mm or less.
  • the wet tensile strength in the transverse direction is preferably 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 the test piece a test piece cut into a width of 25 mm ( ⁇ 0.5 mm) and a length of 150 mm is used in both the vertical and horizontal directions. In the case of multiple plies, the tissue paper is measured with multiple plies.
  • a load cell tensile tester TG-200N manufactured by Minebea Co., Ltd. and an equivalent machine are used as the tester.
  • the gripping interval is set to 100 mm, and the tensile speed is set to 50 mm / min.
  • the test piece used is one that has been cured in a dryer at 105 ° C. for 10 minutes. After tightening both ends of the test piece to the grips of the tester, use a flat brush soaked in water to apply water horizontally to the center of the test piece with a width of about 10 mm, and then immediately move it up and down with respect to the paper piece. A tensile load is applied to and the measurement is performed by the procedure to read the indicated value (digital value) when the paper breaks.
  • the wet tensile strength Five sets of samples are prepared in each of the longitudinal direction and the transverse direction, and the measurement is performed 5 times each, and the average of the measured values is taken as the wet tensile strength in each direction.
  • the wet tensile strength a plurality of sheets were stacked and the wet tensile strength was measured according to the number of plies of the product.
  • the toilet paper according to the present invention has an MMD value, which is an index showing surface properties, of 7.5 or more and 11.0 or less. If the MMD is less than 7.5, the surface is too slippery and the wiping-off property is deteriorated, and if it is more than 11.0, the skin feels poor and it may not be suitable for use as toilet paper.
  • the measurement of MMD is substantially the same as the direction in which the tension is applied while the contact surface of the friction element is brought into contact with the surface of the measurement sample to which a tension of 20 g/cm is applied in the predetermined direction at a contact pressure of 25 g.
  • the friction element is formed by adjoining 20 piano wires P having a diameter of 0.5 mm and has a contact surface formed so that both length and width are 10 mm. It is assumed that a unit bulging portion having a tip formed by 20 piano wires P (radius of curvature 0.25 mm) is formed on the contact surface.
  • the toilet paper of the present embodiment has a softness of 2.0 cN / 100 mm or more and 3.5 cN / 100 mm or less.
  • Softness is one of the indicators of softness that the lower the value, the softer it is. If it is tissue paper or toilet paper, it is said to be soft if it is 3.5 cN / 100 mm or less.
  • the measurement of softness refers to a value measured based on the handle ometer method according to the JIS L 1096 E method (1990). However, the size of the test piece shall be 100 mm ⁇ 100 mm, and the clearance shall be 5 mm. Each ply is measured 5 times in the longitudinal direction and 5 times in the lateral direction, and the average value of all 10 times is taken.
  • the softness is unitless, but in consideration of the size of the test piece, cN/ It may be expressed in units of 100 mm.
  • 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 paper strength agent is not contained from the viewpoint of the user's sense of security.
  • a paper-strengthening agent even if it does not contain a paper-strengthening agent, a high content of 80% by mass or more, and particularly 100% by mass of a softwood kraft pulp having a long fiber length ensures a entanglement between fibers, and it is used. Can be strong enough.
  • since it contains lignin it is also excellent in water decomposability. That is, it is possible to secure sufficient strength without using a paper-strengthening agent and also to improve water decomposability.
  • the toilet paper of the present embodiment it is desirable not to use a dry paper strength enhancer or a wet paper strength enhancer as described above, but it may be used as necessary as long as it does not impair water decomposability.
  • the dry paper strength enhancer used herein include starch, polyacrylamide, CMC (carboxymethyl cellulose) or a salt thereof such as sodium carboxymethyl cellulose, carboxymethyl cellulose calcium, and zinc carboxymethyl cellulose.
  • Wetting paper strength enhancers are polyamide polyamine epichlorohydrin resin, urea resin, acid colloid / melamine resin, heat-crosslinkable coating PAM, TS-20 manufactured by Seikou PMC Co., Ltd., glioxylated polyacrylamide, cationic glioxylated polyacrylamide.
  • examples thereof include polymer aldehyde-functional compounds such as, copolymers of acrylamide monomers modified with divalent aldehydes of glioxal and other copolymerizable unsaturated monomers, or dialdehyde starch.
  • the toilet paper of the present embodiment may be in the form of a sheet, but as shown in FIG. 3, the strip-shaped toilet paper 10 is rolled into a paper tube (also referred to as a tube core) 20. Suitable for the form of rolled toilet rolls.
  • the roll diameter of the toilet roll according to the present invention is preferably L2 (diameter) 110 to 115 mm.
  • the roll diameter of the toilet roll is specified in JIS P 4501 to be 120 mm or less, and a holder for setting a general toilet roll is created based on this 120 mm.
  • the toilet roll of the present invention 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 by using a diameter rule manufactured by Muratec KDS Co., Ltd. or an equivalent machine.
  • the measured value shall be the average value measured at three locations by changing the location in the width direction.
  • the average value for the same production lot product is the average value of 5 rolls.
  • such a toilet roll preferably has a winding length of 20 to 40 m, and at that time, a winding density of 0.20 to 0.30 m/cm 2 .
  • the winding density here is a value calculated by winding length (m) ⁇ actual cross-sectional area.
  • the actual cross-sectional area is ⁇ (roll diameter / 2) x (roll diameter / 2) x ⁇ - (paper tube outer diameter / 2) x (paper tube outer diameter / 2) x ⁇ (unit: cm 2 ). It is a calculated value. That is, it is the area obtained by subtracting the area on the end side of the paper tube opening from the area of the end face.
  • the toilet paper according to the present invention feels remarkably soft when the roll is held in the hand on the peripheral surface when the winding density is in the range of 0.20 to 0.28 m / cm 2. It becomes a thing.
  • the outer diameter of the paper tube (paper tube diameter) L3 is preferably 35 to 45 mm ⁇ , similar to a general size.
  • the roll hardness is 1.8 to 3.0 mm.
  • "Handy compression tester KES-G5" manufactured by Kato Tech Co., Ltd. is used to measure the roll hardness (mm) (T0-TM).
  • the toilet roll TR is placed horizontally on a horizontal pedestal made of steel plate so that its central axis is horizontal, and a steel plate terminal having a circular plane with a compression area of 2 cm 2 is brought into contact with the center of the upper surface of the outer circumference of the roll body. With this contact state as the zero point, the steel plate terminal is moved vertically downward from the zero point at a speed of 10 mm/min to compress the toilet roll.
  • the amount I press when the compressive load 0.5gf / cm 2 T0 (mm) the amount try press when the compressive load 50 gf / cm 2 as a TM (mm), the (T0-TM) (mm) Roll And the winding hardness (mm).
  • the larger the winding hardness (mm) of the roll the larger the pressing depth when pressed to 50 gf/cm@2, indicating that the paper quality is fluffy. That is, it corresponds to a fluffy feeling. It should be noted that the winding length and the winding density described above can provide sufficient winding hardness.
  • the toilet roll of the present invention preferably has a compression work (WC) of 3.5 to 5.5 gf ⁇ cm/cm 2 .
  • Compression work amount (WC) is an amount of work when pushed to 50 gf / cm 2 from contact with steel pins to roll 0.5 gf / cm 2, as the amount of compression work (WC) is large, the initial pushing Since the repulsive force is weak, it feels soft at the moment of gripping the roll, and when the compression load is then pushed deeply to 50 gf/cm 2 when gripping the roll, the roll can be evaluated as soft and fluffy quality.
  • the toilet paper according to the present invention is a long-fiber coniferous kraft pulp containing lignin in which 50% by mass or more of the fibers are oxygen-evaporated and not chlorine-bleached, and the bonds between the fibers are moderately weak. When formed into a shape, it has excellent cushioning properties, and when held in the hand, it is easy to feel the softness as described above.
  • Table 1 shows the composition of the toilet roll and the physical properties/composition of the toilet paper according to each example.
  • the reference example has a general fiber composition equivalent to that of products using chlorine-based bleached pulp, which is also called a bleached product, and LBKP, which is a hardwood pulp, is compared with NBKP, which is a softwood pulp. Many are blended.
  • Comparative Examples 5 to 6 are commercially available products containing unbleached pulp. In Comparative Examples 1 to 3, the basis weight and the paper thickness are particularly higher than those in the examples.
  • the embossing of Reference Examples, Examples, and Comparative Examples 1 to 4 had the pattern shown in FIG.
  • the sensory evaluation was performed by having 18 test subjects actually use the rolled toilet paper according to each example, "softness”, “softness”, “thickness”, “tear when using, strength”, Relative evaluation was performed for each item of "small amount of paper dust during use” based on Comparative Example 6 (conventional product).
  • the evaluation was made by setting Comparative Example 3 to 4 points (median value), scoring up to 7 points when it was good, up to 1 point when it was bad, and scoring the points one by one, and calculating the average value to make a judgment. It was decided to.
  • the examples according to the present invention are “soft”, “soft feeling”, “thickness”, “tear when used, strength”, as compared with the conventional unbleached products of Comparative Examples 5 to 7. , "The amount of paper dust at the time of use” was excellent in sensory evaluation. Also, compared to the bleached product (reference example), it is equivalent in “softness”, “softness”, “thickness”, “tear and strength during use”, “small amount of paper dust during use” The above sensory evaluation has been obtained.
  • softwood pulp having a long fiber length was used as a raw material pulp of 100% by mass, and a papermaking raw material having a high freeness but containing a large amount of LBKP having a short fiber length and a low freeness was used.
  • a sensory evaluation equal to or higher than that of the bleached product (reference example) was obtained. That is, the embodiment of the present invention has the same quality as the bleached product (reference example) while having the sense of security that the unbleached product has.
  • Example 1 is less likely to generate paper dust in each stage.
  • the working amount of the embodiment of the present invention is higher than that of the reference example and the comparative example, and the roll form makes it easier to feel the softness when held in the hand.
  • the toilet paper according to the present invention has a thickness feeling that can be relieved in a situation where it is used in a shower toilet, but it has sufficient softness and does not easily generate paper dust, and is further excellent in water disintegration and is in use. There is a sense of security for the human body in.
  • Toilet roll 10 ... Toilet paper, 20 ... Paper tube (tube core), L1 ... Toilet roll winding diameter (diameter), L2 ... Toilet roll tube core diameter, L3 ... Toilet roll width, 31, 32 ... recess, 33 ... valley line.

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

Le problème décrit par la présente invention est de fournir un papier hygiénique qui présente une excellente sensation d'épaisseur et une excellente capacité de désintégration dans l'eau, qui présente une souplesse suffisante, qui procure une sensation de confort sur le corps d'un utilisateur lors de l'utilisation, et qui est respectueux de l'environnement. Le problème ci-dessus est résolu par un papier hygiénique de 3 à 4 plis dans lequel : chaque pli présente un poids de base de 10,5 à 12,5 g/m2 ; de 50 à 100 % en masse de fibres dans le papier sont de la pâte kraft de résineux blanchie à l'oxygène et non au chlore ; un agent adoucissant à base d'amide d'acide gras cationique est présent ; chacun des plis présente une épaisseur de 80 à 100 µm ; et le papier hygiénique présente une épaisseur globale de 320 à 400 µm et une capacité de désintégration dans l'eau d'au plus 10 secondes.
PCT/JP2020/005222 2019-03-06 2020-02-12 Papier hygiénique WO2020179379A1 (fr)

Priority Applications (4)

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US17/436,145 US20220127790A1 (en) 2019-03-06 2020-02-12 Toilet paper
KR1020217027641A KR102683635B1 (ko) 2019-03-06 2020-02-12 화장지
EP20766224.8A EP3907328B1 (fr) 2019-03-06 2020-02-12 Papier hygiénique
CN202080010190.9A CN113330158B (zh) 2019-03-06 2020-02-12 卫生纸

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JP2019040905A JP7175801B2 (ja) 2019-03-06 2019-03-06 トイレットペーパー

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AU2020471607A1 (en) * 2020-10-09 2023-06-15 Kimberly-Clark Worldwide, Inc. Embossed tissue

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See also references of EP3907328A4

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EP3907328A1 (fr) 2021-11-10
US20220127790A1 (en) 2022-04-28
KR20210134645A (ko) 2021-11-10
JP2020141870A (ja) 2020-09-10
CN113330158A (zh) 2021-08-31
EP3907328B1 (fr) 2023-12-06
JP7175801B2 (ja) 2022-11-21
EP3907328A4 (fr) 2022-10-05
CN113330158B (zh) 2022-11-15

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