Nothing Special   »   [go: up one dir, main page]

US20210401242A1 - Toilet paper - Google Patents

Toilet paper Download PDF

Info

Publication number
US20210401242A1
US20210401242A1 US17/297,220 US201917297220A US2021401242A1 US 20210401242 A1 US20210401242 A1 US 20210401242A1 US 201917297220 A US201917297220 A US 201917297220A US 2021401242 A1 US2021401242 A1 US 2021401242A1
Authority
US
United States
Prior art keywords
paper
toilet paper
toilet
pulp
roll
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US17/297,220
Other languages
English (en)
Inventor
Shuta YASUI
Minoru Iwasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daio Paper Corp
Original Assignee
Daio Paper Corp
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 Daio Paper Corp filed Critical Daio Paper Corp
Publication of US20210401242A1 publication Critical patent/US20210401242A1/en
Abandoned legal-status Critical Current

Links

Images

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
    • 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
    • D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
    • D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
    • 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
    • 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
    • D21H21/32—Bleaching agents
    • 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
    • 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
    • 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 toilet paper.
  • toilet paper suitable for shower toilets be a product with multiple plies such as three plies or four plies, which gives a sense of security when used by a consumer.
  • Toilet paper is generally produced from a fiber raw material obtained by mixing hardwood-derived pulp having a short fiber length and softwood-derived pulp having a long fiber length, and principally, common toilet paper contains a large amount of hardwood-derived pulp that likely improves softness and surface properties.
  • pulp which is a fiber raw material
  • a chlorine-based bleaching chemical such as chlorine, chlorine dioxide or sodium hypochlorite
  • consumers giving great importance to a sense of security for human bodies and environmental consideration desire environmentally friendly products in which pulp free of a chlorine-based bleaching chemical is used as a raw material.
  • Patent Literature 1 JP 2011-153387 A
  • pulp that has not been bleached with a chlorine-based bleaching chemical a large amount of lignin remains, and fiber is hard, and toilet paper obtained using the pulp as a main fiber raw material is likely to give a feeling of hardness or surface roughness.
  • the strength of the paper is decreased by increasing the blending amount of hardwood pulp for easily giving a feeling of softness, but when the blending amount of hardwood pulp is increased, water disintegrability is likely to deteriorate. In the case of multi-ply products, water disintegrability is likely to deteriorate in particular, and therefore when the blending amount of hardwood pulp is increased, the toilet paper may be unsuitable for use in shower toilets.
  • a main object of the present invention is to provide toilet paper which gives a thickness feeling providing security when used in a shower toilet, has sufficient softness, is excellent in water disintegrability, and gives a sense of security for human bodies during use.
  • the first means for achieving the above-described object is toilet paper having three or four plies, in which
  • 80 to 100 mass % of fiber is softwood kraft pulp that is subjected to oxygen pulping and is not bleached with chlorine
  • toilet paper which gives a thickness feeling providing security when used in a shower toilet, has sufficient softness, is excellent in water disintegrability, and gives a sense of security for human bodies during use.
  • FIG. 1 is a plan view of embosses according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram for illustrating a procedure for measuring an emboss depth according to the present invention.
  • FIG. 3 is a perspective view of a toilet roll according to an embodiment of the present invention.
  • the toilet paper according to an embodiment has three plies or four plies. That is, three or four sheets are stacked.
  • the toilet paper has multiple plies including more than two plies, such as three plies or four plies, the overall paper thickness is large while each ply is thin, and the toilet paper hardly breaks and gives a sense of security while it is likely to feel “soft” in particular.
  • the toilet paper has two plies, it is difficult to develop a thickness feeling, and the toilet paper lacks a sense of security when wiping is performed while a large amount of water is absorbed after use of a shower toilet.
  • the toilet paper has five or more plies, it is difficult to feel the softness during cleaning of the skin even when each ply is thinned.
  • the number of plies is five or more while the basis weight and the paper thickness per ply are set according to the present invention as described later, and in particular, embosses are applied, the rigid feeling is intensified, and it is difficult to feel the softness.
  • the toilet paper according to this embodiment has a basis weight of 12.5 g/m 2 or more and 16.2 g/m 2 or less per ply. If the basis weight of one ply is within this range, when the toilet paper has three or four plies, sufficient resistance to breakage and a good feel against the skin can be obtained, and water disintegrability is easily developed.
  • 80 to 100 mass %, particularly 100 mass %, of the constituent fiber is softwood kraft pulp which is subjected to oxygen pulping and is not bleached with chlorine. More specifically, this softwood kraft pulp, which is also called NOKP, is produced by oxygen pulping continuously performed in a continuous pulping kettle, and is not subsequently bleached with a chlorine-based bleaching chemical in particular.
  • kraft pulp (KP) used for toilet paper includes bleached and unbleached kraft pulp, and unbleached kraft pulp contains a large amount of lignin.
  • the softwood kraft pulp used in the present invention is not bleached with a chlorine-based bleaching chemical, but is subjected to oxygen pulping (removal lignin with oxygen), so that about half of the lignin is removed.
  • the chlorine-based bleaching chemical includes not only chlorine but also chlorine dioxide and sodium hypochlorite.
  • the ECF pulp is not the softwood kraft pulp used in the present invention.
  • the toilet paper according to the present invention contains 80 to 100 mass % of softwood kraft pulp which is not bleached with a chlorine-based bleaching chemical and is subjected to lignin removal treatment by oxygen pulping. That is, the toilet paper is produced using such softwood kraft pulp as a main fiber raw material, particularly as all of fiber raw materials, and therefore gives a sense of security for human bodies during use and it is environmentally friendly.
  • toilet paper containing 80 to 100 mass % of such softwood kraft pulp is light brown and thus apt to look like a natural product which has not been chemically treated. Also, such toilet paper gives an impression of being soft. Therefore, a purchaser has a great sense of security.
  • lignin removal treatment by oxygen pulping reduces the amount of lignin to about half of that before the oxygen pulping, it is easier to develop softness and obtain high strength as compared to a case where pulp which is not subjected to lignin removal treatment at all is used as a raw material.
  • the amount of hardwood kraft pulp, whose water disintegrability is apt to decrease is at most less than 20 mass %, particularly 0 mass %, it is easy to improve water disintegrability.
  • lignin is not hydrophilic
  • lignin-containing softwood kraft pulp which is subjected to oxygen pulping and is not bleached with chlorine has low fiber swellability and weak interfiber bonding.
  • the fibers become less dense, so that water disintegrability is improved.
  • an excellent cushioning property is obtained because softwood kraft pulp is derived from softwood and thus has a longer fiber length than that of pulp derived from hardwood and because lignin has an action of preventing densification of the fibers.
  • the toilet paper according to the present invention contains 80 to 100 mass % of the softwood kraft pulp and has a basis weight of 12.5 to 16.0 g/m 2 per ply.
  • the basis weight per ply is more preferably 12.7 to 15.8 g/m 2 .
  • the basis weight according to the present invention is based on the basis weight measurement method of JIS P 8124 (1998).
  • the toilet paper contains 80 to 100 mass % of the softwood kraft pulp, and has a slightly low basis weight per ply of 12.5 to 15.5 g/m 2 , and multiple plies such as three plies or four plies, the toilet paper is excellent in thickness feeling and water disintegrability, easily develops softness, gives a sense of security for human bodies during use, and is environmentally friendly.
  • the pulp fiber may be virgin pulp or used paper pulp.
  • the used paper pulp tends to have finer fiber than the pulp fiber before the regeneration, and due to such a property of the fiber, the fiber is easily densified to enhance the paper strength without increasing the paper thickness.
  • the blending ratio may be set within the range of 0 to less than 20 mass %.
  • the type of used paper pulp is not necessarily limited, and used paper pulp with milk carton used paper or high-quality used paper is particularly desirable.
  • Used paper pulp contains a large amount of hardwood kraft pulp (LBKP) derived from a raw material, so that it is easy to develop paper strength.
  • LLKP hardwood kraft pulp
  • the toilet paper according to the present invention be moisturizer-non-coated toilet paper substantially not coated with a moisturizer.
  • the moisturizer as an external additive according to the present invention is a polyol, and includes at least glycerin, diglycerin, propylene glycol, 1,3-butylene glycol and polyethylene glycol.
  • the toilet paper may contain the above-described components as long as their effect is not worthy of giving the toilet paper a moisture-retaining property.
  • the toilet paper according to the present invention is excellent in sense of security for human bodies, and when a moisturizer is applied, a sticky feeling and a moist feeling peculiar to the moisturizer arise, so that the sense of security for human bodies decreases.
  • a softener or a softening moisturizer that determines the softness and paper strength of the base paper itself, is internally added during papermaking to the toilet paper according to the present invention.
  • the softener contained in the toilet paper according to the present invention is a cationic fatty acid amide-based softener.
  • the toilet paper according to the present invention preferably contains this cationic fatty acid amide-based softener.
  • the cationic fatty acid amide-based softener does not undergo a decrease in effect due to the presence of lignin, and acts to coat the fiber surface. Accordingly, even when pulp containing lignin is blended at a high ratio, the surface is smooth, the stiff feeling markedly decreases, and the fullness is enhanced.
  • a reaction product of epihalohydrin with an amide-based compound obtained by reaction of a polyalkylene polyamine with a monocarboxylic acid is desirable.
  • the effect is exhibited when this cationic fatty acid amide-based softener is used.
  • the reaction product is mixed with an emulsifier having an alkyl group and/or an alkylene group with 4 to 20 carbon atoms, and water, followed by addition of the mixture.
  • the content of the cationic fatty acid amide-based softener is not necessarily limited, and when the fixing rate is 50 to 60%, the amount added during production may be 0.5 to 4.0 kg/ton of pulp.
  • a softening moisturizer be internally added to the toilet paper according to the present invention. It is desirable that the content be 0.2 to 2.0 kg/ton of pulp. Presence of a softening moisturizer improves flexibility.
  • the softening moisturizer is particularly preferably a reaction product obtained by reacting a higher fatty acid with 12 to 24 carbon atoms and/or an ester compound of a higher fatty acid with 12 to 24 carbon atoms with a compound obtained by adding an alkylene oxide with 2 to 4 carbon atoms to active hydrogen of a polyalkyleneimine with a weight average molecular weight of 500 to 10,000. Presence of the softening moisturizer further improves softness.
  • the toilet paper according to the present invention may be embossed.
  • the embossed pattern is not necessarily limited.
  • the embosses can be applied in an appropriate embossed pattern such as microembosses, dot-shaped embosses or design embosses.
  • a suitable embossed pattern according to the present invention has a concave area of 1.0 to 2.5 mm 2 , a density of 5.0 to 50 pieces/cm 2 and an emboss depth of 0.05 to 0.5 mm.
  • the softness as toilet paper is improved, and the softness in a rolled state like that of a toilet roll is enhanced, so that the toilet paper is likely to feel soft when a consumer holds it in the hand.
  • valley line portions 33 extending from the four corners of the concave are present between the concave 31 ( 32 ) and the concave 31 ( 32 ). It is desirable that the valley line portion 33 be gradually gently arranged in an arch shape at a cross-section so as to be deepest at the four corners of the concave 31 ( 32 ) and shallowest at the middle point between the concaves. This embossed pattern is excellent in softness and stool wiping property.
  • the emboss depth is measured by a one-shot 3D measurement macroscope VR-3200 manufactured by KEYENCE CORPORATION or its equivalent, and the image analysis software “VR-H1A” or its equivalent software.
  • the measurement is performed under the conditions of a magnification of 12 times and a viewing area of 24 mm ⁇ 18 mm. However, the magnification and the viewing area can be appropriately changed depending on the size of the emboss (concave).
  • the specific measurement procedure will be described with reference to FIG. 2 .
  • the average of the depth values of the concave edge points P 1 and P 2 is taken as a maximum depth value Max.
  • the distance (length) of the concave edge points P 1 and P 2 on the X-Y plane is taken as a length of the longest part.
  • the two concave edge points P 1 and P 2 projected and most sharply curved are visually selected. In the selection, reference may be made to a contour E in the image in plan view of the emboss (concave) 40 during the measurement.
  • the emboss (concave) depth is measured for the shortest part in a direction perpendicular to the longest part, and the value of a larger depth is adopted as the emboss (concave) depth.
  • the above measurement is performed for any 10 embosses on the surface of the toilet paper, and an average thereof is taken as the final emboss depth.
  • the contour of the emboss concave is visually confirmed from a 3D image obtained by performing measurement with a one-shot 3D measurement macroscope VR-3200 manufactured by KEYENCE CORPORATION or its equivalent, and the image analysis software “VR-H1A” or its equivalent software, and the area inside the contour is measured.
  • the measurement is performed for any 10 embosses on the surface of the toilet paper, and an average thereof is taken as the final emboss area.
  • the toilet paper according to the present invention has a paper thickness of 120 to 150 ⁇ m per ply, and a paper thickness of 400 to 600 ⁇ m as a whole of the toilet paper.
  • the method for measuring the paper thickness of toilet paper includes sufficiently humidity-conditioning a test piece under the conditions of JIS P 8111 (1998) (usually about 8 hours), and then performing measurement in a one-ply state by use of 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, the scale on the dial thickness gauge is moved to set to the zero point, the plunger is then raised to place a sample on a sample table, the plunger is slowly moved down, and the gauge at this time is read.
  • the toilet paper is embossed, it is ensured that one concave (convex) is within the range of the measuring table.
  • the plunger is merely placed, and is not pressed.
  • the terminal of the plunger is made of metal.
  • the paper thickness is an average of values obtained by performing measurement 10 times.
  • there may be collapsed embosses (concaves) but the paper thickness in the present invention is a value obtained by measuring the values including those of such collapsed embosses, and such collapse may be ignored.
  • a paper thickness difference caused by collapse of concaves can be ignored.
  • the toilet paper according to the present invention is very rapidly hydrolyzed with the water disintegrability being 10 seconds or less. This is because 80 mass % or more, particularly 100 mass %, of the constituent fiber is softwood kraft pulp containing lignin, so that the fiber is easily loosened.
  • the water disintegrability is 10 seconds or less, the risk of clogging pipes at the time of disposition by running water in a flush toilet or the like dramatically decreases.
  • the water disintegrability (easiness of loosening) is measured in accordance with 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 the rotor is adjusted to 600 ⁇ 10 rotations/minute.
  • a square test piece 100 ⁇ 2 mm on a side is put into the beaker, and the stopwatch is started.
  • the rotation speed of the rotor once decreases to about 500 rotations due to the resistance of the test piece, and the rotation speed increases as the test piece is loosened.
  • the test is conducted five times, and an average thereof is taken as a result of ease of loosening.
  • 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 be one in which the Canadian standard freshness of the papermaking raw material is 650 cc or more.
  • the Canadian standard freshness of the papermaking raw material is 650 cc or more, the pulp fiber is hardly beaten, or fiber from an unbeaten raw material, and therefore toilet paper further excellent in water disintegrability is easily obtained.
  • the toilet paper according to the present invention have a dry tensile strength of 400 cN/25 mm or more and 900 cN/25 mm or less in a longitudinal direction. It is desirable that the dry tensile strength in a lateral direction be 200 cN/25 mm or more and 450 cN/25 mm or less.
  • the toilet paper can be sufficiently used as long as the dry tensile strength is within the above-mentioned range.
  • the longitudinal direction of the paper which is also called a MD direction
  • the lateral direction of the paper which is also called a CD direction
  • the dry tensile strength according to the present invention is a value measured in accordance with JIS P 8113 (2006). The measurement is performed in the following manner.
  • As a test piece one obtained by cutting the paper to approximately a width of 25 mm ( ⁇ 0.5 mm) ⁇ length of 150 mm in both longitudinal and lateral directions, is used.
  • the test piece is measured as it has a plurality of plies.
  • As a testing machine a load cell tensile testing machine TG-200N manufactured by Minebea Inc.
  • the grip interval is set to 100 mm, and the tensile speed is set to 100 mm/min.
  • the measurement is performed in accordance with a procedure in which the test piece is tightly fastened at both ends to a grip of the testing machine, a tensile load is applied to the paper piece in an up-down direction, and an indicated value (digital value) is read at the time when the paper breaks.
  • For each of the longitudinal direction and the lateral direction five samples are prepared, measurement is performed five times, and an average of the measured values is taken as a dry tensile strength in each of the directions.
  • the dry tensile strength was measured with a plurality of sheets stacked to coincide with the number of plies of the product.
  • For the base paper the dry tensile strength was measured with a plurality of sheets stacked to coincide with the number of plies of the product.
  • the toilet paper according to the present invention have a wet tensile strength of 50 cN/25 mm or more and 100 cN/25 mm or less in a longitudinal direction. It is desirable that the wet tensile strength in a lateral direction be 25 cN/25 mm or more and 50 cN/25 mm or less.
  • the wet tensile strength is a value measured in accordance with JIS P 8135 (1998). The measurement is performed in the following manner. A test piece cut to approximately a width of 25 mm ( ⁇ 0.5 mm) ⁇ length of 150 mm in both longitudinal and lateral directions. When having a plurality of plies, the tissue paper is measured as it has a plurality of plies.
  • a load cell tensile testing machine TG-200N manufactured by Minebea Inc. or a machine equivalent thereto is used as a testing machine.
  • the grip interval is set to 100 mm, and the tensile speed is set to 50 mm/min.
  • As the test piece one cured with a dryer at 105° C. for 10 minutes is used.
  • the measurement is performed in accordance with a procedure in which the test piece is tightly fastened at both ends to a grip of the testing machine, water is then horizontally applied to the central part of the test piece with a width of about 10 mm, a tensile load is then immediately applied to the paper piece in an up-down direction, and an indicated value (digital value) is read at the time when the paper breaks.
  • wet tensile strength was measured with a plurality of sheets stacked to coincide with the number of plies of the product.
  • the toilet paper according to the present invention be one in which the MMD value that is an index showing surface properties is 7.5 or more and 9.5 or less. If MMD is less than 7.5, the surface is excessively slippery, so that the wiping property deteriorates. If MMD is more than 9.5, the toilet paper may be poor in texture, and thus unsuitable for its use purpose.
  • the surface of a friction element is brought into contact under a contact pressure of 25 g with the surface of a measurement sample given a tension of 20 g/cm in a predetermined direction, and is simultaneously moved by 2 cm at a speed of 0.1 cm/s in a direction substantially identical to the direction in which the tension is given, and the coefficient of friction at this time is measured by use of a frictional feeling tester KES-SE (manufactured by KATO TECH CO., LTD.) or an equivalent machine.
  • the value obtained by dividing the coefficient of friction by the friction distance is MMD.
  • the friction element is formed by mutually adjacent 20 piano wires P each having a diameter of 0.5 mm, and has a contact surface formed so as to have a length of 10 mm and a width of 10 mm.
  • the contact surface is provided with a unit bulge portion having a tip formed by 20 piano wires P (curvature radius is 0.25 mm).
  • the toilet paper of this embodiment preferably have a softness of 1.8 cN/100 mm or more and 3.5 cN/100 mm or less.
  • the softness is one of the indices of softness, and the lower the value of the softness, the softer the product.
  • the tissue paper or the toilet paper is considered sufficiently soft when the value of the softness is 1.0 cN/100 mm or less.
  • the softness is a value measured on the basis of a handle-o-meter method conforming to the JIS L 1096E method (1990).
  • the size of the test piece is 100 mm ⁇ 100 mm, and the clearance is 5 mm. In each of the longitudinal direction and the lateral direction, measurement is performed five times per ply. An average of a total of 10 measurements is taken as the softness.
  • the softness has no unit, but may be expressed in a unit of cN/100 mm with consideration given to the size of the test piece.
  • the dry tensile strength and the wet tensile strength can be adjusted without use of a dry paper strength enhancer or a wet paper strength enhancer. It is desirable that in particular, the toilet paper be free of the paper strength enhancer from the viewpoint of a sense of security for users.
  • the toilet paper according to the present invention contains softwood kraft pulp having a large fiber length in a large amount of 80 mass % or more, particularly 100 mass %, and therefore even when a paper strength enhancer is not contained, entanglement of fibers can be secured to obtain strength sufficient for use.
  • the toilet paper contains lignin, and is therefore excellent in water disintegrability. That is, sufficient strength can be secured without use of a paper strength enhancer, and water disintegrability can be improved.
  • the toilet paper of this embodiment it is desirable to prevent use of a dry paper strength enhancer or a wet paper strength enhancer as described above, but such an agent may be used as necessary as long as the water disintegrability is not impaired.
  • the dry paper strength enhancer as used herein include starch, polyacrylamide, CMC (carboxymethyl cellulose), and sodium carboxymethyl cellulose, calcium carboxymethyl cellulose and zinc carboxymethyl cellulose which are salts of CMC.
  • wetting paper strength enhancer examples include polyamide polyamine epichlorohydrin resins, urea resins, acid colloid/melamine resins, heat-crosslinkable coating PAM, TS-20 manufactured by Seiko PMC Corporation, polymer-aldehyde functional compounds such as glyoxylated polyacrylamide and cationic glyoxylated polyacrylamide, copolymers of acrylamide monomers obtained by modifying glyoxal with divalent aldehyde and other copolymerizable unsaturated monomers, and dialdehyde starch.
  • the toilet paper of this embodiment is suitable for formation of a toilet roll in which a strip-shaped toilet paper 10 is wound around a paper tube (also referred to as a tube core) 20 in a roll shape as shown in FIG. 3 .
  • the toilet roll according to the present invention have a winding diameter L 2 (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 prepared on the basis that the winding diameter is 120 mm.
  • the toilet roll of the present invention which has a winding diameter of 110 to 115 mm, is sized to be thoroughly settable in a general holder.
  • the winding diameter is a value measured by use of a diameter rule manufactured by MURATEC-KDS Corp. or an equivalent machine. The measured value is an average of measurements made at three different positions in a width direction. The average in products of the same production lot is an average for five rolls.
  • the winding length of the toilet roll be 20 to 40 m, and here it is desirable that the winding density be 0.20 to 0.30 m/cm 2 .
  • the winding density here is a value calculated from the formula: winding length (m) ⁇ actual cross-sectional area.
  • the actual cross-sectional area is calculated from the formula: ⁇ (roll diameter/2) ⁇ (roll diameter/2) ⁇ (paper tube outer diameter/2) ⁇ (paper tube outer diameter/2) ⁇ (unit; cm 2 ). That is, actual cross-sectional area is an area obtained by subtracting the lateral surface area of the opening of the paper tube from the area of the end surface.
  • the toilet paper according to the present invention feels markedly soft when the peripheral surface of the roll is held in a hand. It is desirable that the outer diameter of the paper tube (paper tube diameter) L 3 be 35 to 45 mm ⁇ , similarly to a general size.
  • the winding hardness of the roll be 1.8 to 2.2 mm.
  • “Handy Compression Tester KES-G5” manufactured by KATO TECH CO., LTD. is used for measuring the winding hardness (mm) (T0-TM) of the roll.
  • the toilet roll TR is horizontally placed on a horizontal pedestal formed of a steel plate in such a manner that the central axis of the toilet paper 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 periphery of the roll trunk.
  • This contact state is taken as a zero point, and the steel plate terminal is moved vertically downward from such a zero point at a speed of 10 mm/min to compress the toilet roll.
  • the amount of pressing at a compressive load of 0.5 gf/cm 2 is T0 (mm)
  • the amount of pressing at a compressive load of 50 gf/cm 2 is TM (mm)
  • (T0-TM) (mm) is the winding hardness of the roll.
  • the toilet roll of the present invention have a compression work amount (WC) of 3.6 to 4.6 gf ⁇ cm/cm 2 .
  • the compression work amount (WC) is a work amount when the steel plate terminal is brought into contact with the roll at 0.5 gf/cm 2 and then pressed to 50 gf/cm 2 .
  • the compression work amount (WC) increases, the repulsive force at the initial stage of pressing decreases, so that the roll feels soft at the instance when the roll is grasped, and when the roll is subsequently pressed to a large depth under a compression load of 50 gf/cm 2 at which the roll is normally held, the roll can be evaluated as being soft and fluffy in quality.
  • 80 to 100 mass % of fiber is softwood kraft pulp which is subjected to oxygen pulping and is not bleached with chlorine and which contains lignin and has a large fiber length, and interfiber bonding is weak, so that in the above-described roll form, the toilet paper is excellent in cushioning property, and likely to feel soft when held in a hand as described above.
  • Comparative Example 3 For the sensory evaluation, 18 subjects actually used the rolled toilet paper of each example, and relative evaluation was performed on the items of “softness”, “fullness”, “thickness feeling” and “tear strength during use” with respect to Comparative Example 3 (conventional product). In the evaluation, Comparative Example 3 was given a score of four points (median), and scores were given at intervals of one point where the highest score was set to seven points and the lowest score was set to one point. An average of the scores was calculated.
  • Examples according to the present invention showed excellent results in the sensory evaluation. In addition, for water disintegrability, markedly excellent results were obtained. In addition, in comparison with Comparative Example 1 which is comparable in winding density to examples, superior measurement results were obtained in terms of winding hardness and compression work amount (WC) when the toilet paper is in the form of a roll. Further, regarding the strength, measurement results were obtained which shows that strength sufficient to prevent breakage during use was secured.
  • WC winding hardness and compression work amount
  • the toilet paper according to the present invention gives a thickness feeling providing security when used in a shower toilet, has sufficient softness, is excellent in water disintegrability, and gives a sense of security for human bodies during use.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Sanitary Thin Papers (AREA)
  • Paper (AREA)
US17/297,220 2018-11-30 2019-11-22 Toilet paper Abandoned US20210401242A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2018-226101 2018-11-30
JP2018226101A JP6689944B1 (ja) 2018-11-30 2018-11-30 トイレットペーパー
PCT/JP2019/045729 WO2020110923A1 (ja) 2018-11-30 2019-11-22 トイレットペーパー

Publications (1)

Publication Number Publication Date
US20210401242A1 true US20210401242A1 (en) 2021-12-30

Family

ID=70413777

Family Applications (1)

Application Number Title Priority Date Filing Date
US17/297,220 Abandoned US20210401242A1 (en) 2018-11-30 2019-11-22 Toilet paper

Country Status (7)

Country Link
US (1) US20210401242A1 (ja)
EP (1) EP3865035A4 (ja)
JP (1) JP6689944B1 (ja)
KR (1) KR102644625B1 (ja)
CN (1) CN112911977B (ja)
BR (1) BR112021010204A2 (ja)
WO (1) WO2020110923A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113699825A (zh) * 2021-08-31 2021-11-26 田家辉 一种不易破碎的卫生纸及其制备方法

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080248A (en) * 1976-06-28 1978-03-21 Crown Zellerbach Corporation Two-stage oxygen pulping
US6153053A (en) * 1998-04-15 2000-11-28 Fort James Corporation Soft, bulky single-ply absorbent paper having a serpentine configuration and methods for its manufacture
US6419790B1 (en) * 1996-05-09 2002-07-16 Fort James Corporation Methods of making an ultra soft, high basis weight tissue and product produced thereby
US20030102096A1 (en) * 2001-04-27 2003-06-05 Georgia-Pacific Corporation Soft bulky multi-ply product and method of making the same
US20060130986A1 (en) * 2004-12-20 2006-06-22 Kimberly-Clark Worldwide, Inc. Flexible multi-ply tissue products
US7381299B2 (en) * 2004-06-10 2008-06-03 Kimberly-Clark Worldwide, Inc. Apertured tissue products
US20090126885A1 (en) * 2004-08-20 2009-05-21 Hiroyuki Akai Bulky water-disintegratable cleaning article and process for producing water-disintegratable paper
US7803250B2 (en) * 2005-12-15 2010-09-28 Dow Global Technologies, Inc. Wiping products having enhanced cleaning abilities
US7815769B2 (en) * 2001-12-03 2010-10-19 Daio Paper Corporation Sanitary paper
US8557269B2 (en) * 2004-04-23 2013-10-15 The Procter & Gamble Company Paper tissue with high lotion transferability
US20180002864A1 (en) * 2016-07-01 2018-01-04 Mercer International, Inc. Multi-density tissue towel products comprising high-aspect-ratio cellulose filaments
US20180127920A1 (en) * 2015-04-29 2018-05-10 Sca Hygiene Products Ab Tissue paper comprising pulp fibers originating from miscanthus and method for manufacturing the same
US20180142420A1 (en) * 2016-11-23 2018-05-24 Kimberly-Clark Worldwide, Inc. Hesperaloe tissue having improved cross-machine direction properties

Family Cites Families (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06322696A (ja) * 1993-05-13 1994-11-22 Nippon Paper Ind Co Ltd 家庭用紙及びその製造方法
JP3566044B2 (ja) * 1997-09-24 2004-09-15 ユニ・チャーム株式会社 水解性の繊維シート及びそれが重ねられた拭き取り用シート
JP2005204868A (ja) * 2004-01-22 2005-08-04 Daio Paper Corp 家庭用薄葉紙
US7377995B2 (en) * 2004-05-12 2008-05-27 Kimberly-Clark Worldwide, Inc. Soft durable tissue
US20070233024A1 (en) * 2004-06-03 2007-10-04 Daio Paper Corporation Sanitary Thin Paper and Process for Producing the Same
JP4776989B2 (ja) * 2005-04-19 2011-09-21 王子ネピア株式会社 洗浄便座用トイレットロール
JP4533806B2 (ja) * 2005-06-06 2010-09-01 大王製紙株式会社 水解性衛生紙
JP5191112B2 (ja) * 2006-09-20 2013-04-24 大王製紙株式会社 紙製ワイパー
JP4570669B2 (ja) * 2008-03-31 2010-10-27 大王製紙株式会社 衛生薄葉紙
JP5497310B2 (ja) * 2009-02-27 2014-05-21 大王製紙株式会社 水解性衛生薄葉紙及びトイレットペーパーロール
JP5317995B2 (ja) 2010-01-26 2013-10-16 日本製紙クレシア株式会社 洗浄機能付きトイレ用トイレットペーパー
JP6034004B2 (ja) * 2011-03-31 2016-11-30 大王製紙株式会社 トイレットペーパー
ES2533841T3 (es) * 2012-05-14 2015-04-15 Sca Tissue France Producto de papel tisú multicapa híbrido y método para fabricarlo
JP6110709B2 (ja) * 2013-03-29 2017-04-05 大王製紙株式会社 トイレットロール
JP5951814B1 (ja) * 2015-01-30 2016-07-13 大王製紙株式会社 トイレットロール
JP6242018B2 (ja) * 2015-06-16 2017-12-06 大王製紙株式会社 ティシュペーパー
JP6131301B2 (ja) * 2015-09-11 2017-05-17 大王製紙株式会社 対人用拭き取り紙
JP6069452B1 (ja) * 2015-09-30 2017-02-01 大王製紙株式会社 トイレットペーパー
JP6399998B2 (ja) * 2015-12-28 2018-10-03 ユニ・チャーム株式会社 水解性不織布及びその製造方法
JP6794640B2 (ja) * 2016-03-22 2020-12-02 王子ホールディングス株式会社 トイレットペーパー
JP6188855B1 (ja) * 2016-03-31 2017-08-30 大王製紙株式会社 ティシュペーパー
JP6733412B2 (ja) * 2016-08-09 2020-07-29 王子ホールディングス株式会社 トイレットロール
CN106283840A (zh) * 2016-08-17 2017-01-04 安庆市新宜纸业有限公司 一种水溶性卫生纸的制备方法
JP6801151B2 (ja) * 2016-08-31 2020-12-16 日本製紙クレシア株式会社 トイレットロール
JP6633565B2 (ja) * 2017-03-31 2020-01-22 大王製紙株式会社 ティシュペーパー及びティシュペーパー製品の製造方法
JP7084717B2 (ja) * 2017-12-27 2022-06-15 大王製紙株式会社 トイレットペーパー
CN108179647B (zh) * 2018-02-27 2021-03-23 日照华泰纸业有限公司 一种无氯微漂针叶木浆制备方法
CN108685512B (zh) * 2018-05-25 2020-04-28 龙游旭荣纸业有限公司 一种纸巾及其制造方法和应用

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080248A (en) * 1976-06-28 1978-03-21 Crown Zellerbach Corporation Two-stage oxygen pulping
US6419790B1 (en) * 1996-05-09 2002-07-16 Fort James Corporation Methods of making an ultra soft, high basis weight tissue and product produced thereby
US6153053A (en) * 1998-04-15 2000-11-28 Fort James Corporation Soft, bulky single-ply absorbent paper having a serpentine configuration and methods for its manufacture
US20030102096A1 (en) * 2001-04-27 2003-06-05 Georgia-Pacific Corporation Soft bulky multi-ply product and method of making the same
US7815769B2 (en) * 2001-12-03 2010-10-19 Daio Paper Corporation Sanitary paper
US8557269B2 (en) * 2004-04-23 2013-10-15 The Procter & Gamble Company Paper tissue with high lotion transferability
US7381299B2 (en) * 2004-06-10 2008-06-03 Kimberly-Clark Worldwide, Inc. Apertured tissue products
US20090126885A1 (en) * 2004-08-20 2009-05-21 Hiroyuki Akai Bulky water-disintegratable cleaning article and process for producing water-disintegratable paper
US20060130986A1 (en) * 2004-12-20 2006-06-22 Kimberly-Clark Worldwide, Inc. Flexible multi-ply tissue products
US7803250B2 (en) * 2005-12-15 2010-09-28 Dow Global Technologies, Inc. Wiping products having enhanced cleaning abilities
US20180127920A1 (en) * 2015-04-29 2018-05-10 Sca Hygiene Products Ab Tissue paper comprising pulp fibers originating from miscanthus and method for manufacturing the same
US20180002864A1 (en) * 2016-07-01 2018-01-04 Mercer International, Inc. Multi-density tissue towel products comprising high-aspect-ratio cellulose filaments
US20180142420A1 (en) * 2016-11-23 2018-05-24 Kimberly-Clark Worldwide, Inc. Hesperaloe tissue having improved cross-machine direction properties

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Johan Gullichsen, Papermaking Science and Technology, Fapet Helsinki, 1st Edition, A635-A665 (Year: 2000) *

Also Published As

Publication number Publication date
JP6689944B1 (ja) 2020-04-28
EP3865035A4 (en) 2022-07-20
WO2020110923A1 (ja) 2020-06-04
JP2020081795A (ja) 2020-06-04
EP3865035A1 (en) 2021-08-18
KR102644625B1 (ko) 2024-03-06
KR20210095857A (ko) 2021-08-03
CN112911977A (zh) 2021-06-04
CN112911977B (zh) 2022-11-11
BR112021010204A2 (pt) 2021-08-17

Similar Documents

Publication Publication Date Title
US6896767B2 (en) Embossed tissue product with improved bulk properties
EP3907328B1 (en) Toilet paper
JP5485520B2 (ja) 衛生薄葉紙及びその製造方法
US20210059484A1 (en) Toilet paper
JP2009240721A5 (ja)
US20210401242A1 (en) Toilet paper
US12134862B2 (en) Toilet paper and method for producing toilet paper
JP2800595B2 (ja) ティシュペーパー
JP2020044385A (ja) ペーパータオルのロール体
JP7493328B2 (ja) トイレットロール
WO2023053494A1 (ja) トイレットロール
WO2023053496A1 (ja) トイレットロール
WO2023053495A1 (ja) トイレットロール
JP6985323B2 (ja) トイレットペーパー
JP2023051120A5 (ja)
JP2023051121A5 (ja)

Legal Events

Date Code Title Description
STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: FINAL REJECTION MAILED

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION