US3395708A - Method for improving a fluffed fibrous wood pulp batt for use in sanitary products and the products thereof - Google Patents

Method for improving a fluffed fibrous wood pulp batt for use in sanitary products and the products thereof Download PDF

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US3395708A
US3395708A US59300466A US3395708A US 3395708 A US3395708 A US 3395708A US 59300466 A US59300466 A US 59300466A US 3395708 A US3395708 A US 3395708A
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Prior art keywords
wood pulp
batt
products
fibrous wood
improving
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Laurence R B Hervey
Donald K George
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Riegel Textile Corp
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Riegel Textile Corp
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Priority to NL135226D priority Critical patent/NL135226C/xx
Application filed by Riegel Textile Corp filed Critical Riegel Textile Corp
Priority to US59300466 priority patent/US3395708A/en
Priority to GB497567A priority patent/GB1180801A/en
Priority to AT99267A priority patent/AT288601B/en
Priority to CH168467A priority patent/CH453060A/en
Priority to DK66867A priority patent/DK127258C/en
Priority to ES336599A priority patent/ES336599A1/en
Priority to DE1561756A priority patent/DE1561756C2/en
Priority to FR94527A priority patent/FR1510789A/en
Priority to NL6702327A priority patent/NL6702327A/xx
Priority to BE694400D priority patent/BE694400A/xx
Priority to LU53062D priority patent/LU53062A1/xx
Priority to SE778267A priority patent/SE318187B/xx
Application granted granted Critical
Publication of US3395708A publication Critical patent/US3395708A/en
Priority to DE19691932012 priority patent/DE1932012A1/en
Anticipated expiration legal-status Critical
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/505Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators with separable parts, e.g. combination of disposable and reusable parts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent 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
    • A61F13/534Absorbent 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 having an inhomogeneous composition through the thickness of the pad
    • A61F13/53409Absorbent 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 having an inhomogeneous composition through the thickness of the pad having a folded core
    • A61F13/53427Absorbent 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 having an inhomogeneous composition through the thickness of the pad having a folded core having an e-folded cross-section
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/20Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing organic materials
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42Use of materials characterised by their function or physical properties
    • A61L15/48Surfactants
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425Cellulose series
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001Modification of pulp properties
    • D21C9/002Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • D21C9/005Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives organic compounds
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H17/00Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03Non-macromolecular organic compounds
    • D21H17/05Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/07Nitrogen-containing compounds
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15203Properties of the article, e.g. stiffness or absorbency
    • A61F13/15211Properties of the article, e.g. stiffness or absorbency soluble or disintegratable in liquid
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent 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
    • A61F13/534Absorbent 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 having an inhomogeneous composition through the thickness of the pad
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent 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
    • A61F13/534Absorbent 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 having an inhomogeneous composition through the thickness of the pad
    • A61F13/53409Absorbent 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 having an inhomogeneous composition through the thickness of the pad having a folded core
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent 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 shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F2013/49068Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterized by the shape of the outline
    • A61F2013/49076Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterized by the shape of the outline as "I"-shaped
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51Absorbent 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 outer layers
    • A61F13/514Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51401Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material
    • A61F2013/51409Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a film
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent 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
    • A61F2013/530131Absorbent 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 being made in fibre but being not pulp
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/56Supporting or fastening means
    • A61F2013/5694Other non adhesive means than hook and loop-type fastener or belts
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/249921Web or sheet containing structurally defined element or component
    • Y10T428/249953Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249962Void-containing component has a continuous matrix of fibers only [e.g., porous paper, etc.]
    • Y10T428/249964Fibers of defined composition
    • Y10T428/249965Cellulosic

Definitions

  • ABSTRACT OF THE DISCLOSURE A method for improving a fluffed fibrous wood pulp batt and the resulting product thereof comp-rising impregnating a wet slurry of wood pulp with a cationic debonding agent, forming the wet slurry into a wet pressed wood pulp sheet, drying, mechanically fiberizing the sheet and air-laying the fibers to form a fluffed fibrous wood pulp batt.
  • This method and improved product provides a uffed fibrous wood pulp batt which is substantially completely fiberized to eliminate undesirable residual sheet particles and minimize fiber breakage and dust to provide longer, stronger andmore uniform fibers for producing greater loft, moisture absorption and strength in the batt to adapt the same for use in sanitary products or the like.
  • This invention relates to a novel method for improving a flufied fibrous wood pulp batt wherein the iiuffed fibrous wood pulp is substantially completely fiberized to eliminate undesi-ra-ble residual untiberized sheet particles and minimize ber breakage and dust so as to provide longer, stronger and more uniform fibers for producing greater loft, moisture absorption and strength in the batt. Additionally, the invention relates to the utilization of the improved fiuffed fibrous wood pulp batt in the construction of diapers, sanitary napkins, bandages, nursing pads, etc., which are collectively designated hereinafter as sanitary products.
  • fluffed fibrous wood pulp batts for use in sanitary products or the like have been formed by mechanically fiberizing a dried wet pressed wood pulp sheet with a hammermill or other suitable mechanical means and forming the resulting fibers into a coherent web or batt with an air-laying device. Due to the difiiculty of mechanically fiberizing the pulp sheet, these prior fiberizing operations were dusty and necessarily utilized a large energy requirement. The resulting fiberized liuffed wood pulp batt had the undesirable characteristics of not being fully fiberized resulting in nonuniformity of fiber lengths, fiber breakage, residual sheet particles, etc. which reduced loft, moisture labsorption and strength in the batt. Batts formed by these conventional methods often had a rough granular texture and did not provide maximum comfort to the wearer when used in sanitary products worn against the body to absorb body liuids.
  • the novel method of the present invention overcomes the above problems and, therefore, rprovides an improved fluffed wood pulp batt and resulting improved sanitary products utilizing the improved flutfed wood pulp batt.
  • FIGURE 1 is a reduced perspective view of a sanitary napkin utilizing the improved fiuffed fibrous wood pulp batt of this invention
  • FIGURE 2 is a full scale cross-sectional view of the sanitary napkin of FIGURE 1 taken substantially along the line 2 2 of FIGURE 1;
  • FIGURE 3 is a reduced perspective view of a diaper 3,395,708 Patented Aug. 6, 1968 ice pad utilizing the improved fluffed fibrous wood pulp batt of this invention and illustrated as being held in a holder for application to a baby; and
  • FIGURE 4 is a full scale cross-sectional view of the diaper pad of FIGURE 3 taken substantiallyalong the line 4 4 of FIGURE 3.
  • a fiuffed fibrous wood pulp batt adapted for use in sanitary products or the like, may be improved by being substantially completely liberized so as to eliminate undesirable residual sheet particles and minimize fiber breakage and dust providing longer, stronger and more uniform fibers for producing g-reater loft, softness, moisture absorption and strength in the batt.
  • the improvement is accomplished by impregnating a wet slurry of wood pulp with a cationic debonding agent, forming the wet slurry into a wet pressed wood pulp sheet, and mechanically fiberizing the dried sheet to form a substantially completely fiberized fluffed fibrous wood pulp batt.
  • wet pressed wood pulp sheets are formed by the utilization of a pulping operation which reduces wood into pulp and forms a wet slurry of wood pulp. From the pulping process, the wet slurry of Wood pulp is led to a conventional paper machine or other suitable apparatus and formed into a sheet which is then wet pressed and dried.
  • the above Operations are conventional and well known to those with ordinary skill in the art and, therefore, further details herein are deemed unnecessary.
  • the cationic debonding agent it has been found most advantageous to add the cationic debonding agent to the wet slu-rry of wood pulp following the pulping operation, preferably in a stock chest or other suitable storage means prior to the papermaking process. It has been found preferable to allow the cationic debonding agent to remain in the wet slurry of unfiberized wood pulp for at least approximately ten minutes before forming the wet pressed wood pulp sheet on the paper machine.
  • the cationic debondin-g agent due to the positive charge thereof, is attracted to the wood pulp and substantially absorbed onto it and weakens the inherent bonding characteristics of the wood pulp during t-he formation of the wet pressed Wood pulp sheet on the paper machine.
  • this action will allow the wood pulp sheet to be more easily mechanically fiberized for forming a substantially completely fiberized, iiuffed, wood pulp batt resulting in the ab-ove-described improved qualities of the fiberized, fluffed, woord pulp batt.
  • Suitable cationic debonding agents for accomplishing the above-described purposes of the present invention fall within ⁇ the class of long chain cationic surfactants, preferably with at least twelve carbon atoms in at least one alkyl chain, and illustrative, but non-limiting, specific examples of same are fatty dialkyl amine quaternary salts, mono fatty alkyl tertiary amine salts, primary amine salts, and unsaturated fatty alkyl amine salts.
  • the amount of debonding agent to be added to the wet slurry of wood pulp may vary substantially, but in actual practice it has been found that amounts of about 0.1% to 5.0%, based on the weight of dry wood pulp, may be used. Amounts less than 0.1% provide very little irnprovement in the fiberization process. A typical treatment which has been found to give very good results is 1.5% of di hydrogenated tallow dimethyl ammonium chloride or 1.0% of di-soya dimethyl ammonium chloride.
  • the improved fiuffe'd fibrous wood pulp batt is particularly adaptable for use in the manufacture of sanitary products, above described, or for other similar products which require an interior pad of dispersible fibrous absorbent material adapted to absorb the body liuids of the wearer.
  • An interior pad formed from the improved fiuffed 3 fibrous wood pulp batt of this invention is particularly desirable for use with a fiushable paper' wiiappe'r or cover material of the type disclosed is copending application Ser. No. 572,929, now U.S. Patent No. 3,370,590, issued Feb. 27, 1968, assigned to the same assignee as the present invention, for producing ⁇ a completely iiushable sanitary product.
  • a sanitary napkin may be formed which comprises a wrapper or cover layer for completely enclosing a layered, folded or otherwise formed pad 12 utilizing the improved ufied fibrous wood pulp batt 14 of the present invention.
  • the wrapper or cover material 10 ⁇ ⁇ may be woven gauze or other conventional materials or it may be formed of the fiushable paper described in the above-mentioned copending application.
  • This wrapper or cover material will be manufactured in the usual configuration and secured around the interior pad 12 to form attachment tabs on either side of the interior pad for attachment to the normal belt or holding means when utilized by the wearer.
  • the interior pad 12 is formed from a cut fiuffed fibrous Wood pulp batt 14 having a cut layer of creped cellulose wadding 16 superimposed thereon.
  • the batt 14 and the creped cellulose wadding layer 16 are then folded with multiple reverse folds extending in the longitudinal direction of the pad to form a multi-layer interior pad 12, as shown in FIGURE 2.
  • the interior pad 12 may also include a conventional moisture barrier 18 formed of any suitable liquid impervious material.
  • a diaper pad may be formed which comprises a wrapper or cover layer 20 for completely enclosing a layered, folded or otherwise formed interior pad 22 utilizing the improved liuffed fibrous wood pulp batt 24 formed according to this invention.
  • the wrapper or cover material 20 may be woven gauze or other conventional materials or it may be formed of the fiushable paper described in the above-mentioned copending application. This wrapper or cover material is formed in a generally rectangular configuration and is secured around the generally rectangular interior pad 22 for use as a diaper pad to be inserted within a holder 26 for placing in position on the body of the wearer.
  • the interior t. 14- pad 22 utilizes two cut layers of fiuffed fibrous wood pulp 24 superimposed 'on'V eachother andhaving layers of creped cellulose wadding 28 superimposed therebetween and on each of the outside surfaces thereof.
  • Method for improving a fluffed fibrous wood pulp batt adapted for use in sanitary products or the like wherein the fluffed fibrous wood p ulp is substantially completely fiberized to ,eliminate undesirable residual sheet particles and minimize fiber. breakage and dust so as to provide longer, stronger and more uniform fibers for producing greater loft, moisture absorption and strength in said batt said method comprising impregnating a wet slurry of wood pulp with a cationic debonding agent, forming said wet slurry into a wet pressed wood pulp sheet, drying, mechanically fiberizing said sheet and airlaying said fibers to form a fiuffyed wood pulp batt.
  • cationic -debonding agent is a long chain cationic surfactant with at least 12 carbon atoms in at least one alkylchain.

Description

Aug. 6, 1968 L, R, B, HERVEY ET AL 3,395,708
METHOD FOR TMPROVTNG A FLOR-FEO FIBROUS WOOD PULP BATT FOR USE 1N SANITARY PRODUCTS AND THR PRODUCTS THEREFOF Filed NOV. 9, 1966 m mw E V ma E H. DN E C N E R U A and bou/RUS K. GEORGE BY A ,QAM
ATTORNEYS United States Patent O 3,395,708 METHOD FOR-IMPROVING A FLUFFED FIBROUS WOOD PULP BATT FOR USE IN SANITARY PRODUCTS AND THE PRODUCTS THEREOF Laurence R. B. Hervey, West Concord, Mass., and Donald K. George, Greenwood, S.C., assignors, by direct and mesne assignments, to Riegel Textile Corporation, New York, N.Y., a corporation of Delaware Filed Nov. 9, 1966, Ser. No. 593,004
Claims. (Cl. 12S- 284) ABSTRACT OF THE DISCLOSURE A method for improving a fluffed fibrous wood pulp batt and the resulting product thereof comp-rising impregnating a wet slurry of wood pulp with a cationic debonding agent, forming the wet slurry into a wet pressed wood pulp sheet, drying, mechanically fiberizing the sheet and air-laying the fibers to form a fluffed fibrous wood pulp batt. This method and improved product provides a uffed fibrous wood pulp batt which is substantially completely fiberized to eliminate undesirable residual sheet particles and minimize fiber breakage and dust to provide longer, stronger andmore uniform fibers for producing greater loft, moisture absorption and strength in the batt to adapt the same for use in sanitary products or the like.
, This invention relates to a novel method for improving a flufied fibrous wood pulp batt wherein the iiuffed fibrous wood pulp is substantially completely fiberized to eliminate undesi-ra-ble residual untiberized sheet particles and minimize ber breakage and dust so as to provide longer, stronger and more uniform fibers for producing greater loft, moisture absorption and strength in the batt. Additionally, the invention relates to the utilization of the improved fiuffed fibrous wood pulp batt in the construction of diapers, sanitary napkins, bandages, nursing pads, etc., which are collectively designated hereinafter as sanitary products.
Conventionally, fluffed fibrous wood pulp batts for use in sanitary products or the like have been formed by mechanically fiberizing a dried wet pressed wood pulp sheet with a hammermill or other suitable mechanical means and forming the resulting fibers into a coherent web or batt with an air-laying device. Due to the difiiculty of mechanically fiberizing the pulp sheet, these prior fiberizing operations were dusty and necessarily utilized a large energy requirement. The resulting fiberized liuffed wood pulp batt had the undesirable characteristics of not being fully fiberized resulting in nonuniformity of fiber lengths, fiber breakage, residual sheet particles, etc. which reduced loft, moisture labsorption and strength in the batt. Batts formed by these conventional methods often had a rough granular texture and did not provide maximum comfort to the wearer when used in sanitary products worn against the body to absorb body liuids.
The novel method of the present invention overcomes the above problems and, therefore, rprovides an improved fluffed wood pulp batt and resulting improved sanitary products utilizing the improved flutfed wood pulp batt.
Some of the features of this invention having been stated, other features will appear as the description proceeds, when taken in conjunction with the accompanying drawings, in which- FIGURE 1 is a reduced perspective view of a sanitary napkin utilizing the improved fiuffed fibrous wood pulp batt of this invention;
FIGURE 2 is a full scale cross-sectional view of the sanitary napkin of FIGURE 1 taken substantially along the line 2 2 of FIGURE 1;
FIGURE 3 is a reduced perspective view of a diaper 3,395,708 Patented Aug. 6, 1968 ice pad utilizing the improved fluffed fibrous wood pulp batt of this invention and illustrated as being held in a holder for application to a baby; and
FIGURE 4 is a full scale cross-sectional view of the diaper pad of FIGURE 3 taken substantiallyalong the line 4 4 of FIGURE 3.
In accordance with the present invention, it has been discovered that a fiuffed fibrous wood pulp batt, adapted for use in sanitary products or the like, may be improved by being substantially completely liberized so as to eliminate undesirable residual sheet particles and minimize fiber breakage and dust providing longer, stronger and more uniform fibers for producing g-reater loft, softness, moisture absorption and strength in the batt. The improvement is accomplished by impregnating a wet slurry of wood pulp with a cationic debonding agent, forming the wet slurry into a wet pressed wood pulp sheet, and mechanically fiberizing the dried sheet to form a substantially completely fiberized fluffed fibrous wood pulp batt.
Conventionally, wet pressed wood pulp sheets are formed by the utilization of a pulping operation which reduces wood into pulp and forms a wet slurry of wood pulp. From the pulping process, the wet slurry of Wood pulp is led to a conventional paper machine or other suitable apparatus and formed into a sheet which is then wet pressed and dried. The above Operations are conventional and well known to those with ordinary skill in the art and, therefore, further details herein are deemed unnecessary.
By this invention, it has been found most advantageous to add the cationic debonding agent to the wet slu-rry of wood pulp following the pulping operation, preferably in a stock chest or other suitable storage means prior to the papermaking process. It has been found preferable to allow the cationic debonding agent to remain in the wet slurry of unfiberized wood pulp for at least approximately ten minutes before forming the wet pressed wood pulp sheet on the paper machine. The cationic debondin-g agent, due to the positive charge thereof, is attracted to the wood pulp and substantially absorbed onto it and weakens the inherent bonding characteristics of the wood pulp during t-he formation of the wet pressed Wood pulp sheet on the paper machine. Manifestly, this action will allow the wood pulp sheet to be more easily mechanically fiberized for forming a substantially completely fiberized, iiuffed, wood pulp batt resulting in the ab-ove-described improved qualities of the fiberized, fluffed, woord pulp batt.
Suitable cationic debonding agents for accomplishing the above-described purposes of the present invention fall within `the class of long chain cationic surfactants, preferably with at least twelve carbon atoms in at least one alkyl chain, and illustrative, but non-limiting, specific examples of same are fatty dialkyl amine quaternary salts, mono fatty alkyl tertiary amine salts, primary amine salts, and unsaturated fatty alkyl amine salts.
The amount of debonding agent to be added to the wet slurry of wood pulp may vary substantially, but in actual practice it has been found that amounts of about 0.1% to 5.0%, based on the weight of dry wood pulp, may be used. Amounts less than 0.1% provide very little irnprovement in the fiberization process. A typical treatment which has been found to give very good results is 1.5% of di hydrogenated tallow dimethyl ammonium chloride or 1.0% of di-soya dimethyl ammonium chloride.
The improved fiuffe'd fibrous wood pulp batt, produced in accordance with the present invention, is particularly adaptable for use in the manufacture of sanitary products, above described, or for other similar products which require an interior pad of dispersible fibrous absorbent material adapted to absorb the body liuids of the wearer.
An interior pad formed from the improved fiuffed 3 fibrous wood pulp batt of this invention is particularly desirable for use with a fiushable paper' wiiappe'r or cover material of the type disclosed is copending application Ser. No. 572,929, now U.S. Patent No. 3,370,590, issued Feb. 27, 1968, assigned to the same assignee as the present invention, for producing `a completely iiushable sanitary product.
Referring now to the drawings, two examples of conimercial sanitary products are shown therein and Will be specifically described hereinafter; however, it is pointed gut that other commercial sanitary products may be prouced.
Referring now to FIGURES l and 2, a sanitary napkin may be formed which comprises a wrapper or cover layer for completely enclosing a layered, folded or otherwise formed pad 12 utilizing the improved ufied fibrous wood pulp batt 14 of the present invention. The wrapper or cover material 10` `may be woven gauze or other conventional materials or it may be formed of the fiushable paper described in the above-mentioned copending application. This wrapper or cover material will be manufactured in the usual configuration and secured around the interior pad 12 to form attachment tabs on either side of the interior pad for attachment to the normal belt or holding means when utilized by the wearer.
In one commercially advantageous form, the interior pad 12 is formed from a cut fiuffed fibrous Wood pulp batt 14 having a cut layer of creped cellulose wadding 16 superimposed thereon. The batt 14 and the creped cellulose wadding layer 16 are then folded with multiple reverse folds extending in the longitudinal direction of the pad to form a multi-layer interior pad 12, as shown in FIGURE 2. The interior pad 12 may also include a conventional moisture barrier 18 formed of any suitable liquid impervious material.
Referring to FIGURES 3 and 4, a diaper pad may be formed which comprises a wrapper or cover layer 20 for completely enclosing a layered, folded or otherwise formed interior pad 22 utilizing the improved liuffed fibrous wood pulp batt 24 formed according to this invention.
The wrapper or cover material 20 may be woven gauze or other conventional materials or it may be formed of the fiushable paper described in the above-mentioned copending application. This wrapper or cover material is formed in a generally rectangular configuration and is secured around the generally rectangular interior pad 22 for use as a diaper pad to be inserted within a holder 26 for placing in position on the body of the wearer.
In one commercially advantageous form, the interior t. 14- pad 22 utilizes two cut layers of fiuffed fibrous wood pulp 24 superimposed 'on'V eachother andhaving layers of creped cellulose wadding 28 superimposed therebetween and on each of the outside surfaces thereof.
Various modifications and changes may be effected in the foregoing description without departing from the scope of this invention as defined in the appended claims.
What claimed is:
1. Method for improving a fluffed fibrous wood pulp batt adapted for use in sanitary products or the like wherein the fluffed fibrous wood p ulp is substantially completely fiberized to ,eliminate undesirable residual sheet particles and minimize fiber. breakage and dust so as to provide longer, stronger and more uniform fibers for producing greater loft, moisture absorption and strength in said batt, said method comprising impregnating a wet slurry of wood pulp with a cationic debonding agent, forming said wet slurry into a wet pressed wood pulp sheet, drying, mechanically fiberizing said sheet and airlaying said fibers to form a fiuffyed wood pulp batt.
2. A method, as defined in claim 1, in which the cationic -debonding agent is a long chain cationic surfactant with at least 12 carbon atoms in at least one alkylchain.
3. A method, as defined in claim 1, in which said debonding agent is selected from the group consisting of fatty dialkyl quaternary amine salts, mono fatty alkyl tertiary amine salts, primary amine salts, and unsaturated fatty alkyl amine salts` 4. A method, as set forth in claim 1, in which from about 0.1% to 5.0% of said debonding agent based on fiber content is impregnated in the wet slurry of wood pulp.
5. An improved fiuffed fibrous wood pulp batt adapted for use in sanitary products or the like produced in accordance with the method of claim 1.
References Cited UNITED STATES PATENTS CHARLES F. ROSENBAUM, Primary Examiner.
US59300466 1966-11-09 1966-11-09 Method for improving a fluffed fibrous wood pulp batt for use in sanitary products and the products thereof Expired - Lifetime US3395708A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
NL135226D NL135226C (en) 1966-11-09
US59300466 US3395708A (en) 1966-11-09 1966-11-09 Method for improving a fluffed fibrous wood pulp batt for use in sanitary products and the products thereof
GB497567A GB1180801A (en) 1966-11-09 1967-02-01 Improvements in or relating to Fluffed Fibrous Wood Pulp Batts for use in Sanitary products
AT99267A AT288601B (en) 1966-11-09 1967-02-02 Process for the production of a fluffy, fibrous wood pulp fleece
CH168467A CH453060A (en) 1966-11-09 1967-02-06 Process for the production of a fluffy fibrous pulp material and use of this material for the production of sanitary products
DK66867A DK127258C (en) 1966-11-09 1967-02-07 PROCEDURE FOR MAKING A PILLOW OF BLOOD, FIBROES WOOD PAPER PULP, ESPECIALLY FOR USE IN SANITARY PRODUCTS
ES336599A ES336599A1 (en) 1966-11-09 1967-02-08 Method for improving a fluffed fibrous wood pulp batt for use in sanitary products and the products thereof
DE1561756A DE1561756C2 (en) 1966-11-09 1967-02-09 Process for making cellulosic material and sanitary goods made using this cellulosic material
FR94527A FR1510789A (en) 1966-11-09 1967-02-10 A method of improving a fluffy web of fibrous wood pulp for use in sanitary ware and products thereby obtained
NL6702327A NL6702327A (en) 1966-11-09 1967-02-16
BE694400D BE694400A (en) 1966-11-09 1967-02-21
LU53062D LU53062A1 (en) 1966-11-09 1967-02-23
SE778267A SE318187B (en) 1966-11-09 1967-06-02
DE19691932012 DE1932012A1 (en) 1966-11-09 1969-06-24 Cellulose fibre pulp sheet impregnated with - long chain cationic debonding agent

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AT (1) AT288601B (en)
BE (1) BE694400A (en)
CH (1) CH453060A (en)
DE (1) DE1561756C2 (en)
DK (1) DK127258C (en)
ES (1) ES336599A1 (en)
FR (1) FR1510789A (en)
GB (1) GB1180801A (en)
LU (1) LU53062A1 (en)
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US5749863A (en) * 1994-03-18 1998-05-12 The Procter & Gamble Company Fluid acquisition and distribution member for absorbent core
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US5906894A (en) * 1994-03-25 1999-05-25 Weyerhaeuser Company Multi-ply cellulosic products using high-bulk cellulosic fibers
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CH453060A (en) 1968-05-31
FR1510789A (en) 1968-01-19
GB1180801A (en) 1970-02-11
DE1561756C2 (en) 1975-11-27
SE318187B (en) 1969-12-01
DK127258B (en) 1973-10-08
BE694400A (en) 1967-08-21
DK127258C (en) 1979-07-02
NL6702327A (en) 1968-05-10
NL135226C (en) 1900-01-01
AT288601B (en) 1971-03-10
DE1561756B1 (en) 1970-10-29
LU53062A1 (en) 1967-08-23
ES336599A1 (en) 1968-04-01

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