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WO2025134952A1 - Feuille de pâte à papier pour pâte défibrée, tapis défibré, article absorbant et procédé de production de feuille de pâte à papier pour pâte défibrée - Google Patents

Feuille de pâte à papier pour pâte défibrée, tapis défibré, article absorbant et procédé de production de feuille de pâte à papier pour pâte défibrée Download PDF

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Publication number
WO2025134952A1
WO2025134952A1 PCT/JP2024/044300 JP2024044300W WO2025134952A1 WO 2025134952 A1 WO2025134952 A1 WO 2025134952A1 JP 2024044300 W JP2024044300 W JP 2024044300W WO 2025134952 A1 WO2025134952 A1 WO 2025134952A1
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WO
WIPO (PCT)
Prior art keywords
pulp
fluff
sheet
mass
less
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.)
Pending
Application number
PCT/JP2024/044300
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English (en)
Japanese (ja)
Inventor
公暁 清水
広大 中山
友史 磯▲崎▼
香里 渡邊
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Oji Holdings Corp
Original Assignee
Oji Holdings 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
Priority claimed from JP2023216571A external-priority patent/JP2025099696A/ja
Priority claimed from JP2024080682A external-priority patent/JP2025174365A/ja
Application filed by Oji Holdings Corp filed Critical Oji Holdings Corp
Publication of WO2025134952A1 publication Critical patent/WO2025134952A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
    • 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
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment

Definitions

  • the present invention relates to a pulp sheet for fluff pulp, a fluff mat, an absorbent article, and a method for manufacturing a pulp sheet for fluff pulp.
  • Fluff pulp is made by defibrating wood pulp until it becomes cotton-like. Fluff pulp is used as a water-absorbing material in absorbent articles such as disposable diapers and sanitary napkins.
  • a pulp sheet for fluff pulp containing softwood pulp The content of hardwood pulp in the total pulp components in the pulp sheet for fluff pulp is 30% by mass or less;
  • B1 is the ISO brightness measured in accordance with JIS P 8154-1:2008 of the pulp sheet for fluff pulp after heating at 105°C for 2 hours
  • B0 is the ISO brightness of the pulp sheet for fluff pulp before heating.
  • the first embodiment of the present invention relates to a pulp sheet for fluff pulp, having a pH of a hot water extract measured in accordance with JIS P 8133-2:2013 of 7.0 to 9.5.
  • fluff pulp refers to defibrated pulp, i.e., pulp that has been fiberized or chopped.
  • a "pulp sheet for fluff pulp” refers to a pulp sheet before defibration that is used to manufacture fluff pulp.
  • fluff pulp by defibrating a "pulp sheet for fluff pulp", "fluff pulp” is obtained, and the “fluff pulp” is formed into a sheet shape called a "fluff mat”.
  • a "pulp sheet for fluff pulp” is obtained, for example, by papermaking a slurry containing raw material pulp.
  • the pulp sheet for fluff pulp is subjected to hot water treatment by the method described in JIS P 8133-2:2013, and the pH of the obtained hot water extract is 7.0 to 9.5. More specifically, 2 g of the pulp sheet for fluff pulp is added to 100 ml of deionized water, boiled for 1 hour, cooled to 25°C, and the contents are filtered through a glass filter to obtain a solution to which 1 mol/L potassium chloride solution is added to obtain a hot water extract, and the pH is measured.
  • the pH of the hot water extract is preferably 7.1 or more, more preferably 7.2 or more, and even more preferably 7.3 or more.
  • the pH of the hot water extract is preferably 9.4 or less, more preferably 9.3 or less, and even more preferably 9.2 or less.
  • the pulp raw material is bleached, washed, and then heated under specified conditions, so that the pH of the above-mentioned hot water extract can be adjusted to within a specified range. More specifically, it is preferable to set the pH of the slurry during the heating process to, for example, 2.0 to 9.0. In addition, by appropriately adjusting the raw pulp material, it is also easy to adjust the pH of the above-mentioned hot water extract to within the specified range.
  • the fluff pulp can be made neutral to alkaline by subjecting a pulp sheet for fluff pulp to hot water treatment using the method described in JIS P 8133-2:2013 to a hot water extract having a pH in the range of 7.0 to 9.5.
  • a fluff mat made from such fluff pulp is used as a constituent material for a diaper, acidic urine can be neutralized, and the occurrence of skin rash can be suppressed.
  • a fluff mat For example, 5 parts by weight of a fluff mat is mixed with 20 parts by weight of artificial urine containing 1.94% by weight urea, 0.8040% by weight sodium chloride, 0.2045% by weight magnesium sulfate heptahydrate, and 0.0835% by weight calcium chloride dihydrate, and the mixture is left sealed at 40°C for 1 hour.
  • the pH of the liquid squeezed out of the fluff mat is preferably 6.6 or higher, more preferably 6.8 or higher, even more preferably 7.0 or higher, and particularly preferably 7.5 or higher. If the pH of the liquid squeezed out of the fluff mat is within the above range, this means that the acidic urine has been neutralized, and the occurrence of skin rash is more effectively suppressed.
  • B1 is the ISO brightness measured in accordance with JIS P 8154-1:2008 of the pulp sheet for fluff pulp after heating at 105°C for 2 hours
  • B0 is the ISO brightness of the pulp sheet for fluff pulp before heating.
  • the ISO brightness change is preferably 1.5% or less, more preferably 1.3% or less, and even more preferably 1.1% or less.
  • the lower limit of the ISO brightness change is not particularly limited and may be 0%.
  • a heating treatment process is provided after the pulp raw material is bleached, so that the ISO brightness change amount can be adjusted to a desired range.
  • the ISO whiteness measured in accordance with JIS P 8148:2018 is preferably 80% or more, more preferably 81% or more, even more preferably 82% or more, and particularly preferably 83% or more.
  • the ISO whiteness of the pulp sheet for fluff pulp is preferably 93% or less.
  • the basis weight of the pulp sheet for fluff pulp of this embodiment is not particularly limited, and may be any basis weight that can be produced by the papermaking device used for papermaking.
  • the basis weight of the pulp sheet for fluff pulp is preferably 100 g/m 2 or more, more preferably 150 g/m 2 or more, and even more preferably 200 g/m 2 or more.
  • the basis weight of the pulp sheet for fluff pulp is preferably 1500 g/m 2 or less, more preferably 1400 g/m 2 or less, and even more preferably 1300 g/m 2 or less.
  • the basis weight of the pulp sheet for fluff pulp is measured in accordance with JIS P 8124:2011.
  • the specific burst strength of the pulp sheet for fluff pulp of this embodiment measured in accordance with JIS P 8131: 2009 is preferably 0.5 kPa ⁇ m2 /g or more, more preferably 0.7 kPa ⁇ m2 /g or more, and even more preferably 0.9 kPa ⁇ m2 /g or more.
  • the specific burst strength of the pulp sheet for fluff pulp is preferably 5.0 kPa ⁇ m2 /g or less, more preferably 4.5 kPa ⁇ m2 /g or less, and even more preferably 4.0 kPa ⁇ m2 /g or less.
  • the pulp sheet for fluff pulp of this embodiment preferably contains coniferous pulp.
  • the pulp sheet for fluff pulp of this embodiment may contain hardwood pulp, but the content of hardwood pulp relative to the total pulp components in the pulp sheet for fluff pulp is preferably 30% by mass or less, more preferably 20% by mass or less, even more preferably 15% by mass or less, even more preferably 10% by mass or less, and particularly preferably 5% by mass or less.
  • the content of hardwood pulp may be 0% by mass relative to the total pulp components in the pulp sheet for fluff pulp. By making the content of hardwood pulp 0% by mass, the defibration property of the fluff pulp can be more effectively increased. On the other hand, by containing hardwood pulp within the above range, it is possible to suppress the liquid absorbed in the fluff mat from returning back.
  • the content of softwood pulp relative to all pulp components in the pulp sheet for fluff pulp is preferably 70% by mass or more, more preferably 80% by mass or more, even more preferably 85% by mass or more, even more preferably 90% by mass or more, and particularly preferably 95% by mass or more.
  • the upper limit of the content of hardwood pulp relative to all pulp components in the pulp sheet for fluff pulp is not particularly limited, and may be 100% by mass.
  • softwood pulp and hardwood pulp examples include chemical pulps such as sulfite pulp (SP), soda pulp (AP), bleached kraft pulp (BKP), unbleached kraft pulp (UKP) and oxygen bleached kraft pulp (OKP), semi-chemical pulps such as semi-chemical pulp (SCP) and chemi-groundwood pulp (CGP), and mechanical pulps such as groundwood pulp (GP) and thermomechanical pulp (TMP, BCTMP).
  • SP sulfite pulp
  • AP soda pulp
  • BKP bleached kraft pulp
  • UKP unbleached kraft pulp
  • OKP oxygen bleached kraft pulp
  • semi-chemical pulps such as semi-chemical pulp (SCP) and chemi-groundwood pulp (CGP)
  • mechanical pulps such as groundwood pulp (GP) and thermomechanical pulp (TMP, BCTMP
  • the softwood pulp and hardwood pulp may also be dissolving pulp (DP).
  • the coniferous pulp contained in the pulp sheet for fluff pulp is preferably bleached coniferous kraft pulp.
  • the raw material for bleached coniferous kraft pulp preferably contains at least one species selected from the group consisting of the Pinus, Douglas fir, and Cedar, and more preferably contains at least one species selected from the group consisting of the Pinus and Douglas fir. In this embodiment, it is also preferable to use the Pinus and Douglas fir in combination.
  • the Canadian Standard Freeness (CSF) of hardwood pulp measured in accordance with JIS P 8121-2:2012 is preferably 370 ml or more, more preferably 400 ml or more, and even more preferably 430 ml or more.
  • this Canadian Standard Freeness (CSF) of hardwood pulp is a value measured on the hardwood pulp before papermaking.
  • the length-weighted average fiber length of the softwood pulp used as the raw material pulp is preferably 1.50 mm or more, more preferably 1.75 mm or more, and even more preferably 2.00 mm or more.
  • the length-weighted average fiber length of the softwood pulp is preferably 3.50 mm or less, more preferably 3.20 mm or less, and even more preferably 3.00 mm or less.
  • the length-weighted average fiber length of the hardwood pulp is preferably 0.50 mm or more, more preferably 0.60 mm or more, and even more preferably 0.65 mm or more, and is preferably 1.20 mm or less, more preferably 1.10 mm or less, and even more preferably 1.0 mm or less.
  • the length-weighted average fiber length of each type of pulp contained in the pulp sheet for fluff pulp is measured in accordance with JIS P 8226-2:2011.
  • the pulp sheet for fluff pulp may contain additives as necessary.
  • additives include softeners, fillers, pigments, sizing agents, coagulants, oil-resistant agents, aluminum sulfate, retention improvers, drainage improvers, dry strength enhancers, wet strength enhancers, coloring pigments, water-resistant agents, antistatic agents, sodium sulfate, surfactants, and pH adjusting chemicals (sodium hydroxide, etc.).
  • the pulp sheet for fluff pulp of this embodiment may contain a softener. By including a softener in the pulp sheet for fluff pulp, it is possible to more effectively increase defibration properties.
  • the manufacturing method of the pulp sheet for fluff pulp of this embodiment preferably includes a cooking step in which the pulp raw material is cooked to produce unbleached pulp, a bleaching step, a heating treatment step, and a sheeting step.
  • a dehydration and washing step may be provided between each step as appropriate.
  • a pre-hydrolysis step may be provided before the cooking step
  • an oxygen delignification step may be provided before the bleaching step
  • a cold alkali step may be provided after the bleaching step.
  • a beating step in which the bleached pulp is beaten to a desired freeness may be provided before the sheeting step.
  • the pulp raw material is cooked to obtain unbleached pulp.
  • a known cooking method can be used as the cooking method.
  • the cooking conditions in the cooking step are not particularly limited, but for example, when using the kraft cooking method, the sulfidity of the cooking liquor is preferably 15 to 45%, the cooking temperature is preferably 130 to 170°C, the effective alkali addition rate is preferably 5 to 30 mass% per bone dry wood mass, and the cooking time is preferably 45 to 500 minutes.
  • the kappa number of the unbleached pulp obtained through the cooking step is preferably 10 to 70.
  • Pre-hydrolysis step A prehydrolysis step can be provided before the cooking step.
  • broadleaf or coniferous wood is heated in the presence of water to perform a prehydrolysis treatment.
  • the amount of water relative to broadleaf or coniferous wood is preferably 1.0 to 10, more preferably 1.5 to 8.0, even more preferably 2.0 to 7.0, and even more preferably 2.7 to 5.0.
  • a liquid ratio of 1.0 or more is preferable because hydrolysis proceeds sufficiently and the reaction becomes uniform.
  • the pH of the pulp slurry in the heating treatment step is preferably 2.0 or higher, more preferably 2.5 or higher, even more preferably 3.0 or higher, even more preferably 4.0 or higher, and particularly preferably 5.0 or higher.
  • the pH of the pulp slurry in the heating treatment step is preferably 9.0 or lower, more preferably 8.5 or lower, and even more preferably 8.0 or lower.
  • the pH of the pulp slurry in the heating treatment step is preferably within the above range, but does not have to be a constant pH.
  • the heating method in the heating process is not particularly limited, and steam may be directly introduced into the pulp slurry to heat it, a jacket-type heating device may be used, or the pulp slurry may be left to stand in a heated atmosphere at a temperature higher than room temperature.
  • the temperature of the pulp slurry maintained from the previous process may be used to maintain the temperature.
  • the material may be concrete, metal, or resin.
  • a dedicated heating tank may be used as the heating container, or the residence time until the sheeting process may be used.
  • This embodiment includes a cooking process in which the pulp raw material is cooked to produce unbleached pulp, a bleaching process, a washing process, a heating process, and a sheeting process.
  • the pH of the pulp slurry in the heating process is preferably 2.0 or higher, more preferably 2.5 or higher, even more preferably 3.0 or higher, even more preferably 4.0 or higher, and particularly preferably 5.0 or higher.
  • the pH of the pulp slurry in the heating process is preferably 9.0 or lower, more preferably 8.5 or lower, and even more preferably 8.0 or lower.
  • the pH of the pulp slurry in the heating process is preferably within the above range, but does not have to be a constant pH.
  • the heating process step may be a color tone adjustment step.
  • color tone adjustment is performed in the heating process step, it is preferable that hydrogen peroxide treatment is performed.
  • a hydrogen peroxide treatment step is provided as the final step of the bleaching process, this step corresponds to the color tone adjustment step.
  • a hydrogen peroxide treatment step may be provided separately from the bleaching process.
  • the hydrogen peroxide treatment time is preferably 1 minute or more, more preferably 10 minutes or more, even more preferably 20 minutes or more, and particularly preferably 30 minutes or more.
  • the hydrogen peroxide treatment time is preferably 600 minutes or less, more preferably 300 minutes or less, and even more preferably 120 minutes or less.
  • the concentration of the pulp slurry is preferably 0.5% by mass or more, more preferably 2% by mass or more, and even more preferably 5% by mass or more.
  • the concentration of the pulp slurry is preferably 40% by mass or less, more preferably 35% by mass or less, and even more preferably 30% by mass or less.
  • the pulp slurry concentration in the hydrogen peroxide treatment step is preferably within the above range, but does not have to be a constant concentration.
  • a washing step may be provided after the above steps.
  • the washing step is preferably a dehydration washing step.
  • the pulp after each step is diluted and dehydrated to perform washing.
  • the washing method is not particularly limited, and washing can be performed using a known washing machine. For example, a displacement washing method, a dilution/dehydration method, a press washing method, or a combination of these washing methods can be used.
  • the cleaning process is performed after the bleaching process, but it is not limited to being performed after the bleaching process and may be performed between each process as necessary.
  • the bleached pulp obtained through the heating treatment process is dispersed in water to prepare a slurry.
  • the pulp concentration in the slurry is preferably 0.01 to 10% by mass.
  • additives are added as necessary, it is preferable to add the additives to the slurry.
  • the sheet forming process includes a process of making paper from the slurry using a papermaking machine.
  • the papermaking machine used in the papermaking process is not particularly limited, but for example, a Fourdrinier papermaking machine, a cylinder papermaking machine, a hybrid former, a gap former, or other papermaking machines can be used.
  • the paper may be made into a single layer, or multiple layers may be made together.
  • the fluff mat is a sheet-shaped product of fluff pulp obtained by defibrating the above-mentioned pulp sheet for fluff pulp.
  • the fluff mat of this embodiment is used as a constituent material for a diaper, for example, the occurrence of skin rash can be suppressed.
  • the fluff mat of this embodiment has excellent water absorption properties and can retain liquid after absorbing it. Therefore, the fluff mat of this embodiment suppresses the backflow of liquid.
  • the conditions for defibrating the pulp sheet for fluff pulp are not particularly limited, and for example, a known defibrator or grinder can be used.
  • Fluff mats are formed by layering fluff pulp under an air flow. Specifically, defibrated fluff pulp is transported by air and layered on a metal mesh or a porous substrate such as tissue or nonwoven fabric.
  • This embodiment may relate to an absorbent article having the above-mentioned fluff mat.
  • the absorbent article include paper diapers, urine pads, light incontinence pads, sanitary napkins, etc. Since the fluff mat of this embodiment can neutralize particularly acidic urine, the absorbent article is preferably a paper diaper, a urine pad, or a light incontinence pad.
  • the pulp after the D0 stage was placed in a plastic bag, and ion-exchanged water was added to adjust the pulp concentration to 10% by mass, after which caustic soda was added to the bone dry pulp at 1.0% by mass and hydrogen peroxide was added at 0.2% by mass and mixed thoroughly.
  • the pulp was then immersed in a thermostatic water bath at 70° C. for 90 minutes to carry out E/P stage treatment.
  • the obtained pulp was diluted to 3% by mass with ion-exchanged water, and then dehydrated and washed using a Buchner funnel.
  • the pulp after the E/P stage was placed in a plastic bag and adjusted to a pulp concentration of 10% by mass using ion-exchanged water, after which caustic soda was added to the bone-dry pulp at 1.0% by mass and hydrogen peroxide was added to the bone-dry pulp at 0.3% by mass and mixed thoroughly.
  • the pulp was then immersed in a thermostatic water bath at 70° C. for 90 minutes to carry out a P stage treatment.
  • the resulting pulp was diluted to 3% by mass with ion-exchanged water, and then dehydrated and washed using a Buchner funnel.
  • the pulp after the P stage was placed in a plastic bag and adjusted to a pulp concentration of 10% by mass using ion-exchanged water, after which chlorine dioxide was added to the bone-dry pulp at 0.2% by mass and the pulp was immersed in a thermostatic water bath at 70° C. for 60 minutes to carry out bleaching in the D1 stage.
  • the resulting bleached softwood pulp was diluted to 3% by mass with ion-exchanged water, and then dehydrated and washed using a Buchner funnel.
  • the pulp after the D1 stage was placed in a plastic bag and adjusted to a pulp concentration of 10% by mass using ion-exchanged water, after which chlorine dioxide was added to the bone-dry pulp at 1.0% by mass and the pulp was immersed in a thermostatic water bath at 70° C. for 60 minutes to perform bleaching in the D2 stage.
  • the resulting bleached softwood pulp was diluted to 3% by mass with ion-exchanged water, and then dehydrated and washed using a Buchner funnel to obtain a bleached softwood pulp slurry with a concentration of 10% by mass.
  • Example 4 In Example 2, the same operation as in Example 1 was carried out to obtain a pulp sheet for fluff pulp, except that ion-exchanged water was added to the bleached softwood pulp slurry and the concentration of the bleached softwood pulp slurry during the heating treatment was 2 mass %.
  • Example 6 In Example 2, the same procedure as in Example 1 was carried out except that the heating temperature of the bleached softwood pulp slurry was changed to 70° C., to obtain a pulp sheet for fluff pulp.
  • Example 7 In Example 2, the same procedure as in Example 1 was carried out to obtain a pulp sheet for fluff pulp, except that the heating treatment temperature of the bleached softwood pulp slurry was 60° C. and the slurry was allowed to cool to 25° C. after 12 hours.
  • Example 8 In Example 2, the same procedure as in Example 1 was carried out, except that the heating treatment time of the bleached softwood pulp slurry was changed to 2 hours, to obtain a pulp sheet for fluff pulp.
  • Example 9 In Example 2, the same procedure as in Example 1 was carried out, except that the heating treatment time of the bleached softwood pulp slurry was changed to 48 hours, to obtain a pulp sheet for fluff pulp.
  • Example 10 A pulp sheet for fluff pulp was obtained in the same manner as in Example 2, except that in the preparation of coniferous pulp, the pine and Douglas fir chips were mixed in an oven-dry weight ratio of 70:30.
  • Example 11 Heat treatment of bleached softwood pulp slurry with a concentration of 10% by mass was carried out in the same manner as in Example 2.
  • 60 g of bleached hardwood pulp slurry with a concentration of 10% by mass after the D2 stage was placed in a plastic bag, caustic soda was added to adjust the pH to 5.5, and the bag was left to stand at 40° C. for 12 hours to heat the bleached hardwood pulp.
  • a pulp sheet for fluff pulp was obtained by carrying out the same operation as in Example 1, except that the bleached softwood pulp and the bleached hardwood pulp that had been subjected to the heat treatment were mixed in an oven-dry mass ratio of 95:5 at the time of papermaking.
  • Example 12 A pulp sheet for fluff pulp was obtained in the same manner as in Example 11, except that bleached softwood pulp and bleached hardwood pulp were mixed in an oven-dry mass ratio of 85:15 during papermaking.
  • Example 13 A pulp sheet for fluff pulp was obtained in the same manner as in Example 11, except that bleached softwood pulp and bleached hardwood pulp were mixed in an oven-dry mass ratio of 70:30 during papermaking.
  • Pulp after D1 stage was prepared in [Preparation of softwood pulp] and [Bleaching] in [Preparation of hardwood pulp].
  • the bleached softwood pulp after D1 stage and the bleached hardwood pulp after D1 stage were mixed in an oven-dry mass ratio of 85:15 to obtain a mixed pulp slurry of bleached softwood pulp and bleached hardwood pulp with a concentration of 10% by mass.
  • the same operation as in Example 2 was carried out, except that caustic soda was added to the mixed pulp slurry with a concentration of 10% by mass to adjust the pH of the pulp slurry to 5.5.
  • Comparative Example 2 A pulp sheet for fluff pulp was obtained in the same manner as in Example 1, except that the pH of the bleached softwood pulp was set to 1.0.
  • Example 4 A pulp sheet for fluff pulp was obtained in the same manner as in Example 11, except that bleached softwood pulp and bleached hardwood pulp were mixed in an oven-dry mass ratio of 50:50 during papermaking.
  • Example 2 was carried out in the same manner as in Example 1, except that the bleached softwood pulp slurry having a concentration of 10% by mass after the D2 stage was replaced with a bleached hardwood pulp slurry having a concentration of 10% by mass after the D2 stage.
  • a pulp sheet for fluff pulp conditioned at 23°C and a relative humidity of 50% was cut into 10 mm x 10 mm squares, 3 g of which was weighed out and evenly placed in a Wonder Blender (Osaka Chemical Co., Ltd., model WB-1, rotation speed 25,000 rpm) and defibrated for a predetermined time to produce fluff pulp.
  • the fluff pulp was used to produce hand-made paper with a basis weight of 25 g/ m2 using a standard circular hand-made papermaking machine, and the time required for visual observation to remove all undefibrated material was defined as the defibration time.
  • the fluff mat was prepared using the fluff mat preparation device 100 shown in Fig. 1 under an environment of 23°C and relative humidity of 50%.
  • the fluff mat preparation device 100 is composed of a pulp defibrator 5 (manufactured by Maruto Seiki Co., Ltd.), a stainless steel sieve 22 with a mesh size of 180 ⁇ m (manufactured by AS ONE Co., Ltd., inner diameter 75 mm x inner height 20 mm), a stainless steel sieve 24 with a mesh size of 150 ⁇ m (manufactured by AS ONE Co., Ltd., inner diameter 75 mm x inner height 20 mm), and a PET resin plate (manufactured by Acri Sunday Co., Ltd., Sunday PET, thickness 0.5 mm) cut to 70 cm x 40 cm.
  • a pulp defibrator 5 manufactured by Maruto Seiki Co., Ltd.
  • a stainless steel sieve 22 with a mesh size of 180 ⁇ m manufactured by AS
  • the device was assembled as shown in FIG. 1 using a ram 20, a polypropylene powder funnel 10 (manufactured by AS ONE Corporation, model number 166, aperture 180 mm, leg outer diameter 43 mm, leg length 48 mm), a polypropylene powder funnel 30 (manufactured by AS ONE Corporation, model number 169, aperture 120 mm, leg outer diameter 30 mm, leg length 27 mm), and a household vacuum cleaner 40 (manufactured by Hitachi Home & Life Solutions Corporation, model number CV-CF4).
  • a polypropylene powder funnel 10 manufactured by AS ONE Corporation, model number 166, aperture 180 mm, leg outer diameter 43 mm, leg length 48 mm
  • a polypropylene powder funnel 30 manufactured by AS ONE Corporation, model number 169, aperture 120 mm, leg outer diameter 30 mm, leg length 27 mm
  • a household vacuum cleaner 40 manufactured by Hitachi Home & Life Solutions Corporation, model number CV-CF4
  • the suction power of the household vacuum cleaner was set to a weak setting (suction power of approximately 80 W), and the fluff pulp without undefibrated material obtained during the evaluation of [defibration ability] was added little by little from the top of the fluff mat preparation device. From time to time, the weight of the fluff mat formed on the stainless steel sieve with 180 ⁇ m openings was measured, and the fluff mat was formed until it reached 200 g/m 2. After reaching 200 g/m 2 , the pulp defibrator and the household vacuum cleaner were stopped.
  • the surface of the fluff mat was lightly pressed with a circular stainless steel plate to shape it, and the fluff mat (diameter 75 mm) was gently removed from the sieve with 180 ⁇ m openings so as not to lose its shape.
  • the surface that had been in contact with the stainless steel mesh was defined as the wire surface of the fluff mat.
  • SAP manufactured by Sumitomo Seika Chemicals Co., Ltd., SA60SXII
  • a strike-through plate (10 cm x 10 cm, thickness 85 mm, weight 665 g) made of stainless steel with a hole of 25 mm diameter in the center was placed, and after 10 seconds, 20 g of artificial urine was poured into the hole of the strike-through plate. After the artificial urine was completely absorbed, the strike-through plate was immediately removed.
  • a polyethylene sheet of 11 cm x 11 cm square was placed on the core wrap tissue, and a sponge rubber sheet made of chloroprene rubber of 11 cm x 11 cm square (AS ONE Co., Ltd., thickness 10 mm, hardness (Asker C hardness meter): 45 degrees) was placed on top of that, and a 5 mm thick acrylic plate of 11 cm x 11 cm square was placed on top of that, and a weight of 2.2 kg was placed on top of that.
  • the total weight of the polyethylene sheet, sponge rubber sheet, two acrylic plates, and 2.2 kg weight was 2.31 kg, and the area of the fluff mat was 0.00442 m2 , so the pressure applied to the fluff mat was 5.1 kPa.
  • the artificial urine used here was prepared according to the following procedure. First, methylene blue (manufactured by Kanto Chemical Co., Ltd.) was dissolved in ion-exchanged water to prepare a methylene blue aqueous solution with a concentration of 0.50% by mass.
  • the examples provided a pulp sheet for fluff pulp that was less prone to fading and had excellent defibration properties.
  • the examples also provided a fluff mat that could prevent the occurrence of skin rashes.
  • Second Embodiment Preparation of softwood pulp
  • 200 g bone dry weight was taken and placed in a 2.5 liter autoclave, where kraft cooking was carried out under the following conditions: liquor ratio 5, cooking liquor sulfidity 28%, alkali addition rate 22%, cooking temperature 165° C., and cooking time 120 minutes.
  • the black liquor and pulp were then separated, and the pulp was screened using a flat screen equipped with a 10-cut screen plate to obtain unbleached pulp with a kappa number of about 30.
  • the pulp after the D0 stage was placed in a plastic bag, and ion-exchanged water was added to adjust the pulp concentration to 10% by mass, after which caustic soda was added to the bone dry pulp at 1.0% by mass and hydrogen peroxide was added at 0.2% by mass and mixed thoroughly.
  • the pulp was then immersed in a thermostatic water bath at 70° C. for 90 minutes to carry out E/P stage treatment.
  • the obtained pulp was diluted to 3% by mass with ion-exchanged water, and then dehydrated and washed using a Buchner funnel.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Epidemiology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Chemical & Material Sciences (AREA)
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  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
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Abstract

La présente invention concerne une feuille de pâte à papier pour pâte défibrée qui supprime la décoloration et qui présente d'excellentes propriétés de défibrillation. La présente invention concerne une feuille de pâte à papier pour pâte défibrée, la feuille ayant un pH d'extrait dans l'eau chaude de 7,0 à 9,5 tel que mesuré conformément à la norme JIS P 8133-2:2013. De plus, la présente invention concerne une feuille de pâte à papier pour pâte défibrée contenant de la pâte de bois tendre, la teneur en pâte de bois dur par rapport aux composants de pâte totale dans la feuille de pâte à papier pour pâte à papier défibrée étant inférieure ou égale à 30 % en masse, et le changement de blancheur ISO étant inférieur ou égal à 1,5 %. En outre, la présente invention concerne un tapis défibré et un article absorbant formé à partir de la feuille de pâte à papier pour pâte défibrée ainsi qu'un procédé de fabrication de la feuille de pâte à papier pour pâte défibrée.
PCT/JP2024/044300 2023-12-22 2024-12-13 Feuille de pâte à papier pour pâte défibrée, tapis défibré, article absorbant et procédé de production de feuille de pâte à papier pour pâte défibrée Pending WO2025134952A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2023-216571 2023-12-22
JP2023216571A JP2025099696A (ja) 2023-12-22 2023-12-22 フラッフパルプ用パルプシート、フラッフマット及び吸収性物品
JP2024080682A JP2025174365A (ja) 2024-05-17 2024-05-17 フラッフパルプ用パルプシート、フラッフマット、吸収性物品及びフラッフパルプ用パルプシートの製造方法
JP2024-080682 2024-05-17

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WO2025134952A1 true WO2025134952A1 (fr) 2025-06-26

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08667A (ja) * 1994-06-17 1996-01-09 New Oji Paper Co Ltd フラッフ化セルロース系繊維の製造方法
JP2012211411A (ja) * 2011-03-31 2012-11-01 Nippon Paper Industries Co Ltd フラッフ化パルプを含有する紙
JP2021119271A (ja) * 2017-03-21 2021-08-12 インターナショナル・ペーパー・カンパニー 臭気制御パルプ組成物
JP2021159339A (ja) * 2020-03-31 2021-10-11 Jnc株式会社 不織布シート及びそれを用いた吸収性物品
JP2022546713A (ja) * 2019-09-04 2022-11-07 ストラ エンソ オーワイジェイ フラッフパルプ
JP2023041874A (ja) * 2020-12-24 2023-03-24 大王製紙株式会社 吸収性物品

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08667A (ja) * 1994-06-17 1996-01-09 New Oji Paper Co Ltd フラッフ化セルロース系繊維の製造方法
JP2012211411A (ja) * 2011-03-31 2012-11-01 Nippon Paper Industries Co Ltd フラッフ化パルプを含有する紙
JP2021119271A (ja) * 2017-03-21 2021-08-12 インターナショナル・ペーパー・カンパニー 臭気制御パルプ組成物
JP2022546713A (ja) * 2019-09-04 2022-11-07 ストラ エンソ オーワイジェイ フラッフパルプ
JP2021159339A (ja) * 2020-03-31 2021-10-11 Jnc株式会社 不織布シート及びそれを用いた吸収性物品
JP2023041874A (ja) * 2020-12-24 2023-03-24 大王製紙株式会社 吸収性物品

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