US3799167A - Disposable absorbent pad - Google Patents

Disposable absorbent pad Download PDF

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US3799167A
US3799167A US00214168A US21416871A US3799167A US 3799167 A US3799167 A US 3799167A US 00214168 A US00214168 A US 00214168A US 21416871 A US21416871 A US 21416871A US 3799167 A US3799167 A US 3799167A
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pad
sheet
moisture impermeable
core pad
moisture
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US00214168A
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A Miller
G Currie
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Cellu Products Co Inc
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Cellu Products Co Inc
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    • 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
    • A61F13/45—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 shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/475—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means
    • A61F13/4751—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means the means preventing fluid flow in a transversal direction
    • A61F13/4755—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means the means preventing fluid flow in a transversal direction the means being a flat barrier on or inside the absorbent article, e.g. backsheet wrapped around the edges
    • 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
    • A61F13/45—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 shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/494—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by edge leakage prevention means
    • A61F13/49473—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by edge leakage prevention means the edge leakage prevention means having a continuous closed form, e.g. circle, ellipse, rectangle
    • 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
    • A61F13/51—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 outer layers
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/513—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability
    • A61F13/51305—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability having areas of different permeability
    • 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
    • A61F13/534—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 having an inhomogeneous composition through the thickness of the pad
    • 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
    • A61F13/51—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 outer layers
    • A61F2013/51002—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 outer layers with special fibres
    • A61F2013/51038—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 outer layers with special fibres being a mixture of fibres
    • A61F2013/51042—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 outer layers with special fibres being a mixture of fibres with hydrophobic and hydrophilic fibres
    • 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
    • A61F13/51—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 outer layers
    • A61F2013/51059—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 outer layers being sprayed with chemicals
    • A61F2013/51061—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 outer layers being sprayed with chemicals for rendering the surface hydrophobic
    • 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
    • A61F13/51—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 outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51401—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material
    • A61F2013/51409—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a film
    • 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
    • A61F2013/530131—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 being made in fibre but being not pulp
    • 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
    • A61F13/534—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 having an inhomogeneous composition through the thickness of the pad
    • A61F2013/53445—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 having an inhomogeneous composition through the thickness of the pad from several sheets

Definitions

  • An absorbent pad structure is provided of the sort that is arranged to be disposable and that is particularly suited for use in forming disposable diapers.
  • the disclosed structure incorporates pad means of moisture permeable material having a peripheral margin thereof rendered moisture impermeable and a moisture impermeable backing sheet secured at the peripheral margin 2
  • Drawing Figures 5 UNITED STATES PATENTS 1,850,033 3/1932 Ritter 128/290 R ofthe pad means 2,005,298 6/1935 OBrien 8! a] 128/290 R 3,059,644 10/1962 Atkinson 128/290'R 1 Claim,
  • Disposable diapers as heretofore developed in the art commonly employ an absorbent pad of plied and creped wood pulp wadding covered with a moisture permeable non-woven fabric sheet and backed by a moisture impermeable protective sheet.
  • Representative prior disclosures are found in US. Pats. No. 2,788,003, Reissue No. 26,151, and No. 3,426,756.
  • a problem evident from these prior disclosures has been that of providing satisfactorily against leakage of waste materials by wicking or seepage at the edges of the diaper.
  • the present invention deals effectively with this problem in an improved manner.
  • the present invention is characterized by the combination of pad means of moisture permeable material having a peripheral margin thereof rendered moisture impermeable and a moisture impermeable backing sheet secured to the pad means at its peripheral margin so as to be sealed thereat against lateral escape of moisture from the pad means.
  • peripheral margin of the pad means is rendered moisture impermeable by treatment with a suitable waterproofing composition as noted further below, and marginal sealing of the backing sheet is preferably effected'with a waterproof adhesive, although heat sealing may be employed alternatively for this purpose if desired.
  • FIG. I is a plan view of a disposable diaper structure embodying the present invention.
  • FIG. 2 is an enlarged partial section detail taken substantially at the line 22 in FIG. 1.
  • a pad means 12 formed by a core pad 14 of absorbent material, such as plied and creped wood pulp wadding of the usual sort, with a covering sheet 16 of moisture permeable non-woven fabric of hydrophobic character, such as may be formed with blended acrylic and rayon fiber, applied thereto.
  • the diaper structure is shaped rectangularly in plan with the non-woven cover sheet 16 extending somewhat beyond the core pad 14 in both length and breadth.
  • the dimension of cover sheet 16 should be increased by I inch in both directions so as to provide a r inch extension all around for the securing purposes explained in detail further below.
  • a peripheral margin of the pad means 12 is rendered moisture impermeable by treating the cover sheet 16 with a waterproofing composition in an extent reaching inwardly over the edges of core pad 14 as indicated by stipling at 16 in FIGS. 1 and 2.
  • this inward extent of the peripheral waterproofing of cover sheet 16 should reach over core pad 14 for about I inch from its edges.
  • the diaper structure 10 is completed by a waterproof backing sheet 18 of a moisture impermeable material such as polyethylene film, which is provided in a size corresponding with that of cover sheet 16 and is secured marginally to cover sheet 16 with a waterproof adhesive, as indicated in FIG. 2 at 20, as as to form a seal thereat against lateral escape of moisture from the core pad 14.
  • a waterproof backing sheet 18 of a moisture impermeable material such as polyethylene film
  • Treatment of the covering sheet 16 to render its peripheral margin 16' moisture impermeable can be effected with any composition that will apply readily to saturate the covering sheet material and cure to waterproof the same without stiffening unduly or being chemically irritating in any respect during use of the pad unit.
  • a suitable composition meeting these requirements employs (by weight) parts of emulsified acrylic polyester at 40-70 percent solids formulated with l-l5 parts of emulsified polyacrylic acid salt at 20-40 percent solids and adjusted for proper application viscosity with 3-12 parts of a volatile amine or hydroxide base as well as incorporating 0.1-5.0 parts of a latent acid catlyst.
  • a solvent solution of 100 parts (by weight) of acrylic polyester at 40-70 percent solids with 15-45 parts of formaldehyde, urea or melamine type resins at 50-90 percent solids may be used. Either of these compositions can be applied effectively to nonwoven covering sheet material by roller printing and cured in times ranging from 15 seconds to 5 minutes at temperatures within the range of 200 to 450F.
  • a further composition that may be used is composed of I00 parts (by weight) of emulsified and stabilized butyl'rubber polymer at 40-70 percent solids which may be cured with or without heat (up to 350F) in from 20 minutes to overnight, or from which vulcanilates may be obtained by adding 2-6 parts of elemental sulfur or 2-l0 parts of zinc diethyl dithiocarbamate or 2-8 parts of zinc dibutyl dithiocarbamate, together with a small amount of soluble ionic dithiocarbamate or 2-5 parts of an alkaline dispersion of guanadine acetate.
  • Such additions are mixed with the butyl rubber polymer at a pH of 7.0-9.5, and viscosity is adjusted by further addition of l-8 parts of ammonium or sodium carboxymethyl cellulose or 0.1-3.0 parts of ammonium or sodium chloride. Whenever necessary application tack may be improved by the further addition of 5-30 parts phenol-formaldehyde resin or the like.
  • any of these formulations may be pigmented if desired although the first and last ones require use of a primary dispersant for this purpose. Also, all three formulations can be modified to exhibit fire retardant properties by the addition of 15-45 parts of zinc b0- rate, alumina trihydrate, or alumina hexahydrate.
  • either of the first two formulations can be used quite well as adhesives for securing the covering and backing sheets 16 and I8 peripherally when adjusted to a suitably increased viscosity for this purpose.
  • the procedure for forming a pad structure 10 in accordance with the present invention for disposable diaper use follows usual practice in plying and creping (or embossing) the wood pulp wadding and then cutting the same transversely to form successive core pads 14 of proper size. Then the cut core pads 14 are laminated in registering relation between a suitably wider top running stip of the non-woven covering sheet material, to which a formulation of the foregoing sort has been applied and cured to render the same moisture impermeable at the areas that will form the peripheral margins 16' in successive pad units 10, and a correspondingly wide bottom running strip of the moisture impermeable backing sheet material, to which securing adhesive has been applied to form the peripheral seal 20 during the laminating step. After which, the laminated structure, still in running strip form, is box pleated to the usual disposable diaper disposition and then cut into separate diaper units and finally doubled lengthwise to the arrangement in which such units are normally packed for marketing.
  • a disposable absorbent pad comprising a moisture impermeable backing sheet, a core pad of abosrbent material superimposed on said backing sheet, and a moisture impermeable covering sheet applied to said core pad, said backing and covering sheets corresponding in size and extending peripherally beyond said core pad, and said covering sheet being treated to render the same moisture impermeable at a continuous peripheral margin thereof reaching inwardly over a substantial peripheral portion of said core pad and being secured to said back sheet throughout the entire peripheral extent of said margin so as to form a seal thereat against lateral escape of moisture from said core pad in any direc- PO-ww UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent N 3.799.167 Da d March 26. 1974 I r) Alan H. Miller and Grover C. Currie It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Abstract

An absorbent pad structure is provided of the sort that is arranged to be disposable and that is particularly suited for use in forming disposable diapers. The disclosed structure incorporates pad means of moisture permeable material having a peripheral margin thereof rendered moisture impermeable and a moisture impermeable backing sheet secured at the peripheral margin of the pad means.

Description

United States Patent [1 1 Miller et al.
[i 3,799,167 Mar. 26, 1974 DISPOSABLE ABSORBENT PAD Inventors: Alan H. Miller, Hickory; Grover C.
Currie, Lenoir, both of NC.
Cellu-Products Company, Patterson, N.C
Filed: Dec. 30, 1971 Appl. No.: 214,168
Assignee:
US. Cl. 128/287 References Cited Ruffo 128/287 Grad et a1. 128/290 R Joa 128/290 P Mesek et al. 128/287 Jones 128/290 R Primary Examiner-Charles F. Rosenbaum Attorney, Pinckney Agent, or
F irm-Richards, Shefte &
ABSTRACT An absorbent pad structure is provided of the sort that is arranged to be disposable and that is particularly suited for use in forming disposable diapers. The disclosed structure incorporates pad means of moisture permeable material having a peripheral margin thereof rendered moisture impermeable and a moisture impermeable backing sheet secured at the peripheral margin 2 Drawing Figures 5 UNITED STATES PATENTS 1,850,033 3/1932 Ritter 128/290 R ofthe pad means 2,005,298 6/1935 OBrien 8! a] 128/290 R 3,059,644 10/1962 Atkinson 128/290'R 1 Claim,
I 1" 54 f \'r- .fi
DISPOSABLE ABSORBENT PAD BACKGROUND OF THE INVENTION Disposable diapers as heretofore developed in the art commonly employ an absorbent pad of plied and creped wood pulp wadding covered with a moisture permeable non-woven fabric sheet and backed by a moisture impermeable protective sheet. Representative prior disclosures are found in US. Pats. No. 2,788,003, Reissue No. 26,151, and No. 3,426,756. A problem evident from these prior disclosures has been that of providing satisfactorily against leakage of waste materials by wicking or seepage at the edges of the diaper. The present invention deals effectively with this problem in an improved manner.
SUMMARY OF THE INVENTION Briefly described, the present invention is characterized by the combination of pad means of moisture permeable material having a peripheral margin thereof rendered moisture impermeable and a moisture impermeable backing sheet secured to the pad means at its peripheral margin so as to be sealed thereat against lateral escape of moisture from the pad means.
The peripheral margin of the pad means is rendered moisture impermeable by treatment with a suitable waterproofing composition as noted further below, and marginal sealing of the backing sheet is preferably effected'with a waterproof adhesive, although heat sealing may be employed alternatively for this purpose if desired.
DESCRIPTION OF THE DRAWINGS FIG. I is a plan view of a disposable diaper structure embodying the present invention; and
FIG. 2 is an enlarged partial section detail taken substantially at the line 22 in FIG. 1.
DETAILED DESCRIPTION OFTHIS INVENTION The disposable diaper structure illustrated in the drawings, and indicated generally by the reference numeral It), incorporates a pad means 12 formed by a core pad 14 of absorbent material, such as plied and creped wood pulp wadding of the usual sort, with a covering sheet 16 of moisture permeable non-woven fabric of hydrophobic character, such as may be formed with blended acrylic and rayon fiber, applied thereto.
As shown, the diaper structure is shaped rectangularly in plan with the non-woven cover sheet 16 extending somewhat beyond the core pad 14 in both length and breadth. For example, in a diaper size using a core pad 14 in a length of 16 inches and a width of 12 inches, the dimension of cover sheet 16 should be increased by I inch in both directions so as to provide a r inch extension all around for the securing purposes explained in detail further below.
Additionally, a peripheral margin of the pad means 12 is rendered moisture impermeable by treating the cover sheet 16 with a waterproofing composition in an extent reaching inwardly over the edges of core pad 14 as indicated by stipling at 16 in FIGS. 1 and 2. For exemplary dimensions such as are mentioned above, this inward extent of the peripheral waterproofing of cover sheet 16 should reach over core pad 14 for about I inch from its edges.
The diaper structure 10 is completed by a waterproof backing sheet 18 of a moisture impermeable material such as polyethylene film, which is provided in a size corresponding with that of cover sheet 16 and is secured marginally to cover sheet 16 with a waterproof adhesive, as indicated in FIG. 2 at 20, as as to form a seal thereat against lateral escape of moisture from the core pad 14.
The result of this arrangement is to contain the abosrbent core pad 14 edgewise within a moisture impermeable envelope that not only eliminates all problem with leakage of waste materials therefrom, but also prevents any objectionable separation of core pad portions from the pad unit during use, which has been a further problem with prior art arrangements.
Treatment of the covering sheet 16 to render its peripheral margin 16' moisture impermeable can be effected with any composition that will apply readily to saturate the covering sheet material and cure to waterproof the same without stiffening unduly or being chemically irritating in any respect during use of the pad unit. A suitable composition meeting these requirements employs (by weight) parts of emulsified acrylic polyester at 40-70 percent solids formulated with l-l5 parts of emulsified polyacrylic acid salt at 20-40 percent solids and adjusted for proper application viscosity with 3-12 parts of a volatile amine or hydroxide base as well as incorporating 0.1-5.0 parts of a latent acid catlyst.
Alternatively, a solvent solution of 100 parts (by weight) of acrylic polyester at 40-70 percent solids with 15-45 parts of formaldehyde, urea or melamine type resins at 50-90 percent solids may be used. Either of these compositions can be applied effectively to nonwoven covering sheet material by roller printing and cured in times ranging from 15 seconds to 5 minutes at temperatures within the range of 200 to 450F.
A further composition that may be used is composed of I00 parts (by weight) of emulsified and stabilized butyl'rubber polymer at 40-70 percent solids which may be cured with or without heat (up to 350F) in from 20 minutes to overnight, or from which vulcanilates may be obtained by adding 2-6 parts of elemental sulfur or 2-l0 parts of zinc diethyl dithiocarbamate or 2-8 parts of zinc dibutyl dithiocarbamate, together with a small amount of soluble ionic dithiocarbamate or 2-5 parts of an alkaline dispersion of guanadine acetate. Such additions are mixed with the butyl rubber polymer at a pH of 7.0-9.5, and viscosity is adjusted by further addition of l-8 parts of ammonium or sodium carboxymethyl cellulose or 0.1-3.0 parts of ammonium or sodium chloride. Whenever necessary application tack may be improved by the further addition of 5-30 parts phenol-formaldehyde resin or the like.
Any of these formulations may be pigmented if desired although the first and last ones require use of a primary dispersant for this purpose. Also, all three formulations can be modified to exhibit fire retardant properties by the addition of 15-45 parts of zinc b0- rate, alumina trihydrate, or alumina hexahydrate.
In addition, either of the first two formulations can be used quite well as adhesives for securing the covering and backing sheets 16 and I8 peripherally when adjusted to a suitably increased viscosity for this purpose.
The procedure for forming a pad structure 10 in accordance with the present invention for disposable diaper use follows usual practice in plying and creping (or embossing) the wood pulp wadding and then cutting the same transversely to form successive core pads 14 of proper size. Then the cut core pads 14 are laminated in registering relation between a suitably wider top running stip of the non-woven covering sheet material, to which a formulation of the foregoing sort has been applied and cured to render the same moisture impermeable at the areas that will form the peripheral margins 16' in successive pad units 10, and a correspondingly wide bottom running strip of the moisture impermeable backing sheet material, to which securing adhesive has been applied to form the peripheral seal 20 during the laminating step. After which, the laminated structure, still in running strip form, is box pleated to the usual disposable diaper disposition and then cut into separate diaper units and finally doubled lengthwise to the arrangement in which such units are normally packed for marketing.
The present invention has been described in detail above for purposes of illustration only and is not intended to be limited by this description or otherwise to exclude any variation or equivalent form or procedure that would be apparent from, or reasonably suggested by, the foregoing disclosure to the skill of the art.
We claim:
1. A disposable absorbent pad comprising a moisture impermeable backing sheet, a core pad of abosrbent material superimposed on said backing sheet, and a moisture impermeable covering sheet applied to said core pad, said backing and covering sheets corresponding in size and extending peripherally beyond said core pad, and said covering sheet being treated to render the same moisture impermeable at a continuous peripheral margin thereof reaching inwardly over a substantial peripheral portion of said core pad and being secured to said back sheet throughout the entire peripheral extent of said margin so as to form a seal thereat against lateral escape of moisture from said core pad in any direc- PO-ww UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent N 3.799.167 Da d March 26. 1974 I r) Alan H. Miller and Grover C. Currie It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
Column 2, line 4, after "20" delete "as" and insert therefor -so; Column 2, line 8, delete "abosrbent" and insert therefor -absorbent; Column 2, line 27, delete "catlyst" and insert therefor -catalyst; Column 2, line 48, delete "ammonium" and insert therefor --methyl-; Column 3, l ine 3, delete "stip" and insert therefor -st rip; Column 4, line 8, delete "impermeable" and insert therefor permeable;i Column 4, line 15, delete "bask" and insert therefor -backing-.
Signed and sealed this 4th day'of-February 1975.
(SEAL) Attest:
McCOY M. GIBSON JR. c. MARssALL DANN Attesting Officer Commissioner of Patents

Claims (1)

1. A disposable absorbent pad comprising a moisture impermeable backing sheet, a core pad of abosrbent material superimposed on said backing sheet, and a moisture impermeable covering sheet applied to said core pad, said backing and covering sheets corresponding in size and extending peripherally beyond said core pad, and said covering sheet being treated to render the same moisture impermeable at a continuous peripheral margin thereof reaching inwardly over a substantial peripheral portion of said core pad and being secured to said back sheet throughout the entire peripheral extent of said margin so as to form a seal thereat against lateral escape of moisture from said core pad in any direction.
US00214168A 1971-12-30 1971-12-30 Disposable absorbent pad Expired - Lifetime US3799167A (en)

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Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3934587A (en) * 1974-06-17 1976-01-27 Roy Gerald Gordon Disposable articles having a water-permeable and water-repellent surface
US3955040A (en) * 1973-01-29 1976-05-04 W. R. Grace & Co. Polyamide film laminate with entrapped liquid
FR2299824A1 (en) * 1975-02-10 1976-09-03 Willot Consortium Gl Textile D Absorbent nappy pad with one impermeable face - having impermeable border around other face to prevent the pad adhering to the skin
US4015604A (en) * 1976-03-25 1977-04-05 Personal Products Company Absorbent product with side leakage control means
US4085752A (en) * 1976-05-07 1978-04-25 James Canale Colostomy bag pad
US4107426A (en) * 1976-07-06 1978-08-15 Roy Gerald Gordon Process for treating cellulose
US4397645A (en) * 1981-02-24 1983-08-09 The Procter & Gamble Company Disposable absorbent article having an improved liquid containment construction
EP0196654A2 (en) * 1985-04-03 1986-10-08 National Starch and Chemical Investment Holding Corporation Hot melt adhesive waste barrier
US4692161A (en) * 1985-04-03 1987-09-08 National Starch And Chemical Corporation Hot melt adhesive waste barrier
US4718898A (en) * 1985-04-03 1988-01-12 National Starch And Chemical Corporation Hot melt adhesive waste barrier
JPS6399301A (en) * 1986-10-09 1988-04-30 大王製紙株式会社 Disposable diaper
JPS63149903U (en) * 1987-03-23 1988-10-03
US4778458A (en) * 1987-04-16 1988-10-18 Whitestone Products Disposable sanitary absorbent incontinence pad
US4778459A (en) * 1985-03-08 1988-10-18 Fuisz Richard C High absorbency diaper with composite absorbent layer
FR2618645A1 (en) * 1987-07-30 1989-02-03 Boussac Saint Freres Bsf DISPOSABLE PANTY LAYER WITH INSERTS AND LATERAL SEALING COATING
US4808178A (en) * 1981-07-17 1989-02-28 The Proctor & Gamble Company Disposable absorbent article having elasticized flaps provided with leakage resistant portions
EP0360277A2 (en) * 1988-09-23 1990-03-28 Bauerfeind GmbH & Co. Bandage consisting of elastic textile material
US4997428A (en) * 1987-10-27 1991-03-05 Paul Hartman Aktiengesellschaft Disposable diaper with longitudinal superabsorbent concentration gradient
US5013382A (en) * 1986-04-17 1991-05-07 Paul Hartmann Aktiengesellschaft Method of making an absorbent disposable article
US5300054A (en) * 1991-01-03 1994-04-05 The Procter & Gamble Company Absorbent article having rapid acquiring, wrapped multiple layer absorbent body
US5304161A (en) * 1991-01-03 1994-04-19 The Procter & Gamble Company Absorbent article having rapid acquiring, multiple layer absorbent core
US5308344A (en) * 1987-06-08 1994-05-03 The Kendall Company Absorbent pad with moisture barrier
US5476456A (en) * 1994-05-27 1995-12-19 Rankin; Paul Disposable absorbent cover for patient supporting article
US5492751A (en) * 1993-05-20 1996-02-20 Kimberly-Clark Corporation Disposable garment with improved containments means
US5562650A (en) * 1994-03-04 1996-10-08 Kimberly-Clark Corporation Absorbent article having an improved surge management
EP0747029A1 (en) * 1995-06-09 1996-12-11 The Procter & Gamble Company Absorbent article comprising barrier cuffs and an anti-wicking topsheet region located inboard from the barrier cuffs
US5669895A (en) * 1991-11-11 1997-09-23 The Procter & Gamble Company Absorbent article having rapid distribution strip
US5728084A (en) * 1992-09-16 1998-03-17 The Proctor & Gamble Company Absorbent article with controlled distribution of liquid
US5733824A (en) * 1995-06-07 1998-03-31 Bay Mills Ltd Hand-tearable moisture barrier laminate
US5962106A (en) * 1996-09-02 1999-10-05 Johnson & Johnson Ind. E. Com. Ltda Absorbent product
EP1149569A1 (en) * 1999-12-01 2001-10-31 Toyo Eizai Kabushiki Kaisha Disposable diaper
US7368627B1 (en) * 1997-02-04 2008-05-06 Sca Hygiene Products Ab Absorbent article having improved surface properties
US20140378033A1 (en) * 2011-12-13 2014-12-25 Alderson (Nz) Limited Abrasive apparatus and components thereof
WO2015156955A1 (en) * 2014-04-08 2015-10-15 The Procter & Gamble Company Absorbent articles having substrates having flow control materials
US20170095376A1 (en) * 2011-07-29 2017-04-06 Unicharm Corporation Bodily fluid absorbent matrix and method for manufacturing the same
US10271997B2 (en) 2014-04-08 2019-04-30 The Procter & Gamble Company Absorbent articles having substrates having zonal treatments
US10993848B2 (en) 2016-10-11 2021-05-04 The Procter & Gamble Company Discreet disposable absorbent article
US11324642B2 (en) 2018-04-11 2022-05-10 The Procter & Gamble Company Absorbent articles and methods of making the same
US11344454B2 (en) 2016-02-25 2022-05-31 The Procter & Gamble Company Configurable absorbent articles
US11399992B2 (en) 2017-08-24 2022-08-02 The Procter & Gamble Company Configurable absorbent articles having removable fastening members
US11452646B2 (en) 2017-06-05 2022-09-27 The Procter & Gamble Company Configurable absorbent articles having improved bodily exudate visualization
US11478387B2 (en) 2018-04-11 2022-10-25 The Procter & Gamble Company Folded disposable absorbent articles
US11730633B2 (en) 2019-02-21 2023-08-22 The Procter & Gamble Company Absorbent articles having fully removable fastening members

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US3059644A (en) * 1958-10-07 1962-10-23 Personal Products Corp Sanitary napkin and suspensory device therefor
US3523536A (en) * 1966-02-26 1970-08-11 Johnson & Johnson Absorbent fibrous products
US3559649A (en) * 1967-12-20 1971-02-02 Procter & Gamble Sanitary napkin
US3666611A (en) * 1969-08-15 1972-05-30 Curt G Joa Absorbent pad
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US3683916A (en) * 1971-01-11 1972-08-15 Frederick K Mesek Disposable diaper

Cited By (58)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955040A (en) * 1973-01-29 1976-05-04 W. R. Grace & Co. Polyamide film laminate with entrapped liquid
US3934587A (en) * 1974-06-17 1976-01-27 Roy Gerald Gordon Disposable articles having a water-permeable and water-repellent surface
FR2299824A1 (en) * 1975-02-10 1976-09-03 Willot Consortium Gl Textile D Absorbent nappy pad with one impermeable face - having impermeable border around other face to prevent the pad adhering to the skin
US4015604A (en) * 1976-03-25 1977-04-05 Personal Products Company Absorbent product with side leakage control means
US4085752A (en) * 1976-05-07 1978-04-25 James Canale Colostomy bag pad
US4107426A (en) * 1976-07-06 1978-08-15 Roy Gerald Gordon Process for treating cellulose
US4397645A (en) * 1981-02-24 1983-08-09 The Procter & Gamble Company Disposable absorbent article having an improved liquid containment construction
US4808178A (en) * 1981-07-17 1989-02-28 The Proctor & Gamble Company Disposable absorbent article having elasticized flaps provided with leakage resistant portions
US4778459A (en) * 1985-03-08 1988-10-18 Fuisz Richard C High absorbency diaper with composite absorbent layer
EP0196654A2 (en) * 1985-04-03 1986-10-08 National Starch and Chemical Investment Holding Corporation Hot melt adhesive waste barrier
US4718898A (en) * 1985-04-03 1988-01-12 National Starch And Chemical Corporation Hot melt adhesive waste barrier
EP0196654A3 (en) * 1985-04-03 1988-09-21 National Starch And Chemical Corporation Hot melt adhesive waste barrier
EP0400694A1 (en) * 1985-04-03 1990-12-05 National Starch and Chemical Investment Holding Corporation Hot melt adhesive waste barrier
US4692161A (en) * 1985-04-03 1987-09-08 National Starch And Chemical Corporation Hot melt adhesive waste barrier
US5013382A (en) * 1986-04-17 1991-05-07 Paul Hartmann Aktiengesellschaft Method of making an absorbent disposable article
US5062838A (en) * 1986-04-17 1991-11-05 Paul Hartmann Aktiengesellschaft Absorbent disposeable article
JPH0450828B2 (en) * 1986-10-09 1992-08-17 Daio Seishi Kk
JPS6399301A (en) * 1986-10-09 1988-04-30 大王製紙株式会社 Disposable diaper
JPS63149903U (en) * 1987-03-23 1988-10-03
JPH0434825Y2 (en) * 1987-03-23 1992-08-19
US4778458A (en) * 1987-04-16 1988-10-18 Whitestone Products Disposable sanitary absorbent incontinence pad
US5308344A (en) * 1987-06-08 1994-05-03 The Kendall Company Absorbent pad with moisture barrier
EP0304631A1 (en) * 1987-07-30 1989-03-01 Peaudouce Disposable napkin with elastic leg-enclosing means and a spillage barrier
JPH01118605A (en) * 1987-07-30 1989-05-11 Peaudouce Disposable diaper
FR2618645A1 (en) * 1987-07-30 1989-02-03 Boussac Saint Freres Bsf DISPOSABLE PANTY LAYER WITH INSERTS AND LATERAL SEALING COATING
US5100398A (en) * 1987-07-30 1992-03-31 Peaudouce Disposable diaper with crotch elastics and lateral sealing coating
US4997428A (en) * 1987-10-27 1991-03-05 Paul Hartman Aktiengesellschaft Disposable diaper with longitudinal superabsorbent concentration gradient
EP0360277A3 (en) * 1988-09-23 1992-03-04 Bauerfeind GmbH & Co. Bandage consisting of elastic textile material
EP0360277A2 (en) * 1988-09-23 1990-03-28 Bauerfeind GmbH & Co. Bandage consisting of elastic textile material
US5300054A (en) * 1991-01-03 1994-04-05 The Procter & Gamble Company Absorbent article having rapid acquiring, wrapped multiple layer absorbent body
US5439458A (en) * 1991-01-03 1995-08-08 The Procter & Gamble Company Absorbent article having rapid acquiring, multiple layer absorbent core
US5304161A (en) * 1991-01-03 1994-04-19 The Procter & Gamble Company Absorbent article having rapid acquiring, multiple layer absorbent core
US5669895A (en) * 1991-11-11 1997-09-23 The Procter & Gamble Company Absorbent article having rapid distribution strip
US5728084A (en) * 1992-09-16 1998-03-17 The Proctor & Gamble Company Absorbent article with controlled distribution of liquid
US5492751A (en) * 1993-05-20 1996-02-20 Kimberly-Clark Corporation Disposable garment with improved containments means
US5562650A (en) * 1994-03-04 1996-10-08 Kimberly-Clark Corporation Absorbent article having an improved surge management
US5476456A (en) * 1994-05-27 1995-12-19 Rankin; Paul Disposable absorbent cover for patient supporting article
US5733824A (en) * 1995-06-07 1998-03-31 Bay Mills Ltd Hand-tearable moisture barrier laminate
EP0747029A1 (en) * 1995-06-09 1996-12-11 The Procter & Gamble Company Absorbent article comprising barrier cuffs and an anti-wicking topsheet region located inboard from the barrier cuffs
US5962106A (en) * 1996-09-02 1999-10-05 Johnson & Johnson Ind. E. Com. Ltda Absorbent product
US7368627B1 (en) * 1997-02-04 2008-05-06 Sca Hygiene Products Ab Absorbent article having improved surface properties
EP1149569A1 (en) * 1999-12-01 2001-10-31 Toyo Eizai Kabushiki Kaisha Disposable diaper
EP1149569A4 (en) * 1999-12-01 2004-10-27 Toyo Eizai Kk Disposable diaper
US20170095376A1 (en) * 2011-07-29 2017-04-06 Unicharm Corporation Bodily fluid absorbent matrix and method for manufacturing the same
US20140378033A1 (en) * 2011-12-13 2014-12-25 Alderson (Nz) Limited Abrasive apparatus and components thereof
US9387565B2 (en) * 2011-12-13 2016-07-12 Alderson (Nz) Limited Abrasive apparatus and components thereof
WO2015156955A1 (en) * 2014-04-08 2015-10-15 The Procter & Gamble Company Absorbent articles having substrates having flow control materials
CN106132372A (en) * 2014-04-08 2016-11-16 宝洁公司 There is the absorbent article of the substrate including flow control material
JP2017510373A (en) * 2014-04-08 2017-04-13 ザ プロクター アンド ギャンブル カンパニー Absorbent article with substrate having flow control material
US10271997B2 (en) 2014-04-08 2019-04-30 The Procter & Gamble Company Absorbent articles having substrates having zonal treatments
US11344454B2 (en) 2016-02-25 2022-05-31 The Procter & Gamble Company Configurable absorbent articles
US10993848B2 (en) 2016-10-11 2021-05-04 The Procter & Gamble Company Discreet disposable absorbent article
US11452646B2 (en) 2017-06-05 2022-09-27 The Procter & Gamble Company Configurable absorbent articles having improved bodily exudate visualization
US11399992B2 (en) 2017-08-24 2022-08-02 The Procter & Gamble Company Configurable absorbent articles having removable fastening members
US11324642B2 (en) 2018-04-11 2022-05-10 The Procter & Gamble Company Absorbent articles and methods of making the same
US11478387B2 (en) 2018-04-11 2022-10-25 The Procter & Gamble Company Folded disposable absorbent articles
US11576824B2 (en) 2018-04-11 2023-02-14 The Procter & Gamble Company Absorbent articles and methods of making the same
US11730633B2 (en) 2019-02-21 2023-08-22 The Procter & Gamble Company Absorbent articles having fully removable fastening members

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