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ABSORBENT FIBROUS STRUCTURES
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Title:
ABSORBENT FIBROUS STRUCTURES
Subjects:
BRAIDING
;
CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES
;
COTTON-WOOL
;
DISINFECTION, STERILISATION, OR DEODORISATION OF AIR
;
FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS
;
FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
;
HUMAN NECESSITIES
;
HYGIENE
;
IMPREGNATING OR COATING OF PAPER
;
KNITTING
;
LACE-MAKING
;
MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL
;
MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES
;
MEDICAL OR VETERINARY SCIENCE
;
METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL
;
NON-WOVEN FABRICS
;
PAPER NOT OTHERWISE PROVIDED FOR
;
PAPER-MAKING
;
PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D
;
PRODUCTION OF CELLULOSE
;
PULP COMPOSITIONS
;
TEXTILES
;
TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
;
TRIMMINGS
;
WADDING
Description:
1500053 Hydrophillic wood pulp baths PROCTER & GAMBLE CO 2 May 1975 [7 March 1975] 18526/75 Heading D1R An absorbent air-laid structure comprises bleached hydrophilic defibrated wood pulp fibres having an average fibre length of at least 2 mm and an average fibre diameter of 0.02 to 0.06 mm, the structure having a density of 0.04 to 0.18 g/c.c. Preferably the fibres are 2 to 55 mm long. Soft woods (gymnosperms) e.g. spruce are steamed to plasticise the lignin and ground. The pulp is treated with dilute sulphuric acid to destroy micro-organisms and with diethylene triamine pentaacetic acid to remove metal ions and washed with de-ionised water. The pulp is rendered hydrophilic by bleaching with a hot aqueous hydrogen peroxide or sodium peroxide in the presence of sodium silicate and magnesium sulphate, or by bleaching with a hydrosulphite and its hydrophilic character further increased by slurrying with acetone/ methanol to extract hydrophobic lipids. The hydrophilic pulp is comminuted and air laid and the web compressed in a hydraulic die or by rolling. The density of the web is measured under load of 5 g/cm2. The web may include delignified wood pulp, rayon, cotton, cellulose acetate, wool and asbestos fibres.
Creation Date:
1978
Language:
English
Source:
esp@cenet
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