Process for applying composition containing a cationic trivalent metal and debonder and fluff pulp sheet made from same

Patent metadata

Field	Value
Publication number	US-10260201-B2
Application number	US-201715681689-A
Country	US
Kind code	B2
Filing date	Aug 21, 2017
Priority date	Aug 5, 2009
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

A process is provided for making a fluff pulp sheet, comprising contacting at least one cationic trivalent metal, salt thereof, or combination thereof with a composition comprising fluff pulp fibers and water at a first pH, to form a fluff pulp mixture; forming a web from the fluff pulp mixture; and applying at least one debonder surfactant to the web and raising the pH to a second pH, which is higher than the first pH, to make the fluff pulp sheet. A fluff pulp sheet is also provided, comprising a web comprising fluff pulp fibers; at least one cationic trivalent metal, salt thereof, or combination thereof; at least one debonder surfactant; and a fiberization energy of <145 kJ/kg. Products and uses of the fluff pulp sheet are also provided.

First claim

What is claimed is:

1. A process for making a fluff pulp sheet with decreased fiberization energy requirements and maintains a good Mullen value, comprising:
contacting at least one cationic trivalent metal, salt thereof, or a combination thereof with a composition comprising fluff pulp fibers and water at a first pH, to form a fluff pulp mixture;
forming a web from the fluff pulp mixture; and
applying at least one debonder surfactant to the web and raising a pH of the web to a second pH, which is higher than the first pH, to make the fluff pulp sheet,
wherein the first pH is <5.0, and the second pH is ≥5.0;
wherein the debonder surfactant is present in an amount of from 0.45-9.07 kg (1-20 lb) per ton of the fluff pulp fibers;
wherein the cationic trivalent metal, salt thereof, or a combination thereof is present in an amount of 0.45-15.87 kg (1-35 lb) per ton of the fluff pulp fibers; and
wherein the resulting fluff pulp sheet has a fiberization energy of <145 KJ/kg, as determined by fiberizing or shredding the fluff pulp sheet on a hammermill and a Mullen of ≥620.5 KPa (90 psi).

2. The process of claim 1 , wherein:
the forming comprises one or more of contacting the fluff pulp mixture with a table in a papermaking machine, removing at least a portion of water from the fluff pulp mixture with a suction box under a table in a papermaking machine, heating the fluff pulp mixture, or a combination thereof,
the cationic trivalent metal or salt thereof is boron, iron, cobalt, nickel, aluminum, manganese, chromium, salt thereof, or a combination thereof, and
the applying comprises spraying the debonder surfactant onto the web, coating the debonder surfactant onto the web, immersing the web in the debonder surfactant, or a combination thereof, wherein spraying the debonder surfactant onto the web is carried out using one or more formation showers over a table in a papermaking machine,
wherein the process further comprises:
drying the web in a flotation dryer;
applying a debonder surfactant to the fluff pulp sheet,
wherein the applying of the debonder surfactant is carried out before, during, or after the raising of the pH to the second pH, or a combination thereof,
wherein the web has a moisture content of about 6.3%,
wherein the web has a basis weight of 100 to 1100 gsm,
wherein the fluff pulp mixture further comprises one or more whitener, colorant, pigment, optical brightening agent, wetting agent, binder, bleaching agent, other additive, or a combination thereof,
wherein the web comprises a solids content of >1% by weight,
wherein the debonder surfactant is neat, in combination with one or more second debonder surfactant, in solution, or a combination thereof,
wherein the debonder surfactant is in the form of a composition further comprising water and optionally one or more pH adjusting agent, whitener, colorant, pigment, optical brightening agent, wetting agent, binder, bleaching agent, trivalent cationic metal, alum, other additive, or a combination thereof, and
wherein the debonder surfactant comprises one or more of linear or branched monoalkyl amine, linear or branched dialkyl amine, linear or branched tertiary alkyl amine, linear or branched quaternary alkyl amine, ethoxylated alcohol, linear or branched, saturated or unsaturated hydrocarbon surfactant, fatty acid amide, fatty acid amide quaternary ammonium salt, dialkyl dimethyl quaternary ammonium salt, dialkylimidazolinium quaternary ammonium salt, dialkyl ester quaternary ammonium salt, triethanolamine-ditallow fatty acid, fatty acid ester of ethoxylated primary amine, ethoxylated quaternary ammonium salt, dialkyl amide of fatty acid, cationic surfactant, non-ionic surfactant, C 16 -C 18 unsaturated alkyl alcohol ethoxylate, compound having CAS Registry No. 68155-01-1, compound having CAS Registry No. 26316-40-5, or a combination thereof.

3. A fluff pulp sheet, made by the process of claim 1 , comprising
a SCAN-C 33:80 adsorption-time of <4.0,
on screen fractionation a % Good of ≥50%, wherein the % Good is a percent retained on a USA Std #200 sieve and passing a USA Std #50 sieve,
on screen fractionation a % Fines of ≤40%, wherein the % Fines is a percent passing the USA Std #200 sieve, and
on screen fractionation a % Pieces of ≤30%, wherein the % Pieces is a percent retained on a USA Std #8 sieve.

4. The sheet of claim 3 , wherein the cationic trivalent metal is present in the fluff pulp sheet in an amount ≥150 ppm.

5. The sheet of claim 3 , further comprising a moisture content of about 6.3%.

6. The sheet of claim 3 , further comprising a density of 0.5 to 0.75 g/cc.

7. The sheet of claim 3 , further comprising a caliper of 40 to 70 mm.

8. The sheet of claim 3 , further comprising a finished basis weight of 100-1100 gsm.

9. An adsorbent product, paper product, personal care product, medical product, insulating product, construction product, structural material, cement, food product, veterinary product, packaging product, diaper, tampon, sanitary napkin, gauze, bandage, fire retardant, or a combination thereof, comprising the sheet of claim 3 .

Assignees

• Int Paper Co

Inventors

• Sealey James E
• Hevenor Michael

Classifications

• D21H27/002

  Tissue paper; Absorbent paper (D21H21/22, D21H27/02, D21H27/20 take precedence; toilet paper A47K10/00; absorbent pads for physiological fluids A61L15/16; making on paper-making machines D21F11/00) · CPC title

• D21H11/16

  modified by a particular after-treatment · CPC title

• D21C9/002

  by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives · CPC title

• D21H17/66

  Salts, e.g. alums · CPC title

• D21H21/24 Primary

  Surfactants · CPC title