# US 9,039,651 B2 · Fibrous sheet that disintegrates in water, process for manufacturing said fibrous sheet, core consisting of strips of said fibrous sheet

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- Number: US 9,039,651 B2
- Document ID: US9039651B2
- Status: Granted
- Kind: B2
- Application number: 13/264,114
- Filed: 2010-06-11
- Published: 2012-04-12
- Granted: 2015-05-26
- Earliest claimed: 2009-08-03
- Assignees: Sca Tissue France
- Applicants: Philippe Colin; Jean-Claude Dozzi; Pierre Probst; Veronique Wiss; Remy Ruppel
- Inventors: Philippe Colin; Jean-Claude Dozzi; Pierre Probst; Veronique Wiss; Remy Ruppel
- Web page: https://patentgrep.com/patent/US9039651B2

## CPC

- D21H 17/28: Starch
- A47K 10/22: for rolled-up webs
- A61F 13/266: {Insertion devices, e.g. rods or plungers, separate from the tampon}
- D21H 27/30: Multi-ply (for surface covering D21H27/18; making on paper-making machines D21F9/00, D21F11/00)
- D21H 19/54: Starch
- D21H 25/04: Physical treatment, e.g. heating, irradiating (D21H25/18 takes precedence; dryer section of machines for making continuous webs of paper D21F5/00)
- D21H 27/002: {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)}
- 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
- A47K: SANITARY EQUIPMENT; ACCESSORIES THEREFOR, e.g. TOILET ACCESSORIES
- 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 (dental prosthetics A61C)

## Abstract

A fibrous sheet having a basis weight of between 20 and 1000 g/m2 that disintegrates in water, has 10% to 70% starch on the basis of the total weight of the dry fibrous sheet. The disintegration time in water, measured in accordance with standard NF Q34-020 applied to a specimen of the sheet of 9×8 cm2, is less than 50 seconds. A loss of strength of the sheet measured in accordance with a defined table test corresponds to a loss of strength of a specimen of said sheet forming an angle of at least 85° after having being wetted with water for a duration of 6 seconds, and/or a residual wet strength of the sheet relative to its dry strength, as measured according to a defined ring crush test, is less than 1%. The fibrous sheet may be used for the manufacture of a water disintegrable core in a roll of tissue paper.

## Claims

### Claim 1

A process for manufacturing a fibrous sheet comprising at least 30% of papermaking fibres, that disintegrates in water in less than 120 seconds, the process comprising the steps of:
preparing a pulp by suspending the fibres in water;
adding to the pulp a starch which is not soluble in water at a temperature at which it is incorporated;
forming the fibrous sheet from the pulp containing the starch on a forming table; and
drying the fibrous sheet at a temperature that progressively rises so as to reach complete gelatinization of the starch,
wherein the starch is uniformly distributed through the thickness of the fibrous sheet including the external surfaces of the sheet.

### Claim 2

A process for manufacturing a fibrous sheet comprising at least 30% of papermaking fibres, that disintegrates in water in less than 120 seconds, the process comprising the steps of:
preparing a pulp by suspending the fibres in water;
forming the fibrous sheet from the pulp;
adding to the fibrous sheet a starch which is not soluble in water at a temperature at which it is incorporated, wherein the water-insoluble starch is incorporated when the sheet is on a forming wire; and
drying the fibrous sheet containing the starch at a temperature that progressively rises so as to reach complete gelatinization of the starch.

### Claim 3 (depends on 1)

The process according to claim 1, further comprising pressing the fibrous sheet before the drying step.

### Claim 4 (depends on 1)

The process according to claim 1, wherein the water-insoluble starch is a starch modified by physical, chemical or physico-chemical treatment.

### Claim 5 (depends on 2)

The process according to claim 2, further comprising pressing the fibrous sheet before the drying step.

### Claim 6 (depends on 2)

The process according to claim 2, wherein the water-insoluble starch is a starch modified by physical, chemical or physico-chemical treatment.