US3901238A - Disposable diaper having a resin treated absorbent pad to improve integrity, softness and dryness - Google Patents
Disposable diaper having a resin treated absorbent pad to improve integrity, softness and dryness Download PDFInfo
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- US3901238A US3901238A US452095A US45209574A US3901238A US 3901238 A US3901238 A US 3901238A US 452095 A US452095 A US 452095A US 45209574 A US45209574 A US 45209574A US 3901238 A US3901238 A US 3901238A
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- web
- absorbent
- resin
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- absorbent pad
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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
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15585—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers
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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
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15666—Wrapping formed fibrous webs or pads, e.g. the pads being formed by uniting pad pieces cut from fibrous webs
- A61F13/15674—Wrapping formed fibrous webs or pads, e.g. the pads being formed by uniting pad pieces cut from fibrous webs by wrapping webs or pads between webs moving in their longitudinal direction
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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
- A61F13/53—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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS 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
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS 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
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/425—Porous materials, e.g. foams or sponges
-
- 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
- A61F13/537—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
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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
- A61F13/53—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
- A61F13/539—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 characterised by the connection of the absorbent layers with each other or with the outer layers
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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
- A61F13/15577—Apparatus or processes for manufacturing
- A61F2013/15821—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing
-
- 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
- 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
-
- 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
- A61F13/537—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F13/53708—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction
- A61F2013/53721—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction with capillary means
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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
- A61F13/53—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
- A61F13/539—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 characterised by the connection of the absorbent layers with each other or with the outer layers
- A61F2013/53908—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 characterised by the connection of the absorbent layers with each other or with the outer layers with adhesive
Definitions
- a disposable diaper of the present invention employs an air laid absorbent cellulosic core reinforced by the application of a hydrophobic resin at relatively low levels of solids addition to one side thereof with subsequent drying, curing and calendering to the desired overall density.
- a resin-stabilized absorbent core of the present invention exhibits improved surface dryness due to favorable density and capillary gradients which provide improved liquid penetration from the resin treated surface of the core to the non-resin treated portions of the core.
- the present invention has relation to disposable absorbent products generally, and in particular to disposable absorbent products such as bandages, diapers and sanitary napkins.
- the present invention has relation to a resin-stabilized absorbent cellulosic web suitable for use in disposable absorbent products, said web having improved softness and strength as well as favorable density and capillary gradients to provide improved liquid penetration and retention characteristics between the resin treated surface of the web and the non-resin treated portions thereof.
- the present invention has relation to a disposable diaper exhibiting improved softness, texture and hand as well as sufficient strength to resist tearing or shredding of the absorbent pad in use, thereby providing greater wearer comfort and better absorbency along with improved containment due to better fit.
- the present invention has relation to a disposable diaper exhibiting both improved surface dryness and more rapid strikethrough of fluids deposited on the surface of said diaper, thereby eliminating the need for gasketing means along the lateral edge portions of said structure to prevent liquid run-off during periods of heavy flow.
- Disposable absorbent products and particularly disposable absorbent bandages, diapers and sanitary nap kins are well known.
- An object common to such products is the provision of an effective means for absorbing aqueous liquids such as urine deposited thereon in such a manner as to prevent run-off during maximum flow conditions and to effectively retain such liquids absorbed within the absorbent core member of the structure.
- Such structures should preferably exhibit both strength and softness to enhance their absorbency and containment characteristics in addition to wearer comfort.
- Prior art disposable absorbent products have not, however, successfully combined all of the aforementioned desirable features in a single structure.
- hydrophobic and hydrophilic as herein employed, while useful in their brevity actually refer, respectively to relatively low and relatively high critical surface tensions of the materials being characterized.
- the hydrophobic nature of a prior art diaper topsheet is evidenced by its lack of affinity for liquid human waste relative to that of the hydrophilic or absorbent substrate.
- a web is hydrophobic when a drop of liquid waste placed thereon does not spread to any appreciable degree on the web.
- hydrophobic sheet when a hydrophobic sheet is superimposed upon a layer of hydrophilic or less hydrophobic absorbent material to form a diaper and the hydrophobic material is placed next to wearers skin, waste fluids from the wearer pass through the hydrophobic sheet and are preferentially partitioned by and absorbed within the underlying hydrophilic layer, leaving the topsheet adjacent the wearers skin relatively dry.
- the rate at which liquid penetration takes place varies greatly, however, depending upon such factors as the density and capillary gradients existing between the various layers of the absorbent structure and the relative hydrophobicity of the various layers.
- Capillary forces act to draw a liquid from a less dense structure to a more dense hydrophilic structure, i.e., from a large pore size to a smaller pore size, and thisdirectional action can be augmented further by employing a topsheet which is both lower in density and slightly hydrophobic with respect to the hydrophilic absorbent core to promote rapid absorption of the liquid deposited on the topsheet by the absorbent core member, thereby minimizing liquid run-off during periods of heavy flow. Care must be taken, however, that the surface dryness of the structure not be adversely affected.
- hydrophilic core may not be effectively prevented from re-emerging at the surface of the topsheet when the structure is subjected to compressive forces generated by the activities of the wearer.
- a more hydrophobic topsheet provides poorer strike-through characteristics but better surface dryness, while a less hydrophobic topsheet provides better strike-through characteristics but poorer surface dryness.
- a less hydrophobic topsheet provides better strike-through characteristics but poorer surface dryness.
- strike-through is a measure of how long it takes for an absorbent structure to completely absorb a specified quantity of liquid deposited on its surface. Strike-through values are normally expressed in seconds. Low strike-through values are indicative of high absorbency rates, and are, therefore, generally preferred in absorbent bandages and the like.
- Surface wetness is a measure of the degree to which absorbed moisture can be caused to re-emerge from an absorbing matrix, under pressure, to appear as moisture at the surface of the structure where it originally entered the absorbing matrix. Surface wetness values are normally expressed in grams of reemerging liquid absorbed on a standard filter paper superposed on the absorbing matrix. Low surface wetness values are indicative of a greater ability of the absorbent structure to retain an aqueous solution once it has been absorbed, i.e., improved surface dryness.
- a hydropho- Best Available Co Best, Available Copy bic nipshcet encloses the absorbent material of the pad.
- the glthlitfllli? action gives the absorbent pad sufficient time to absorb liquid wastes to thus utilize, as fully as possible. 23.; absorptive power of the diaper while simultaneously preventing runoff during periods of heavy flow and consequent soiling of garments.
- ap plicants invention in a preferred embodiment, provides rapid strike-through and improved surface dryness characteristics in a single structure, thus making the use of side flaps to prevent liquid run-off unnecessary.
- Applicants structure is, therefore, simpler in terms of construction as well as in its application to the wearer.
- Another problem common to most prior art disposable absorbent structures relates to a laclt of strength in the absorbent core materials employed. This problem is particularly apparent with airfelt, an air laid cellulosic material which is widely used in disposable absorbent products due to its desirable absorbency and softness characteristics and its relatively low cost. Disposablc abs rbent products, and particularly disposable diapers fabricated with absorbent cores of unreinforced airfelt do not, however, have sufficient strength to resist tearing and shredding in use. Tearing and shredding of the absorbent core in a disposable diaper is undesirable in that it adversely affects both the absorbency and containment characteristics of the structure in addition to being aesthetically unacceptable to the consumer.
- Prior art disposable absorbent products have dealt with this problem by various means, including, for example, wet calendering of the airfelt, wetstrength tissue addition, embossing of the airfelt, addition of adhesive strips to the airfelt, etc.
- US. Pat. No. 3,6l2,055 which issued to Mesek, et al.. on Oct. l2, i971 discloses a disposable diaper having an absorbent core of loosely compacted cellulosic batt having gr 'iter wettability than that of the facing said batt having a highly compacted layer on its side which is adhered directly to a waterproof king sheet over a widely distributed area of adhesion.
- the densified surface is produced by calendering the absorbent web while the surface to be densified is in a moist condition.
- Liquid deposited on the surface of cture disclosed by lvieselt ct alv passes through the body of the loosely compacted batt and is strongly drawn into the densified layer due to the small capillary radius of the of the densified fibers.
- Such a diaper although e ctive from a liquid absorption and liquid retention standpoint. has a rather stiff feel due to the fact that the ricnsified layer of the absorbent core is in ad lit. it. contact with the waterproof bacltshcet, thereby tending to impart the stiffness of the absorbent core to the entire Structure.
- Still another object of the present invention is to pro vide a soft, compliant disposable diaper exhibiting strike-through characteristics sufficiently rapid to substantially prevent liquid run-off during periods of heavy flow as well as improved surface dryness characteris tics.
- an absorbent fibrous web suitable for use an absorbent core in disposable absorbent products comprising a compressed mass of entangled hydrophilic fibers, the fibers on one surface thereof being treated by the addition of a film-forming, hydrophobic resin at relatively low levels of solids addition while said web is in an uncompressed state, with drying and curing of said resin treated web in the uncompressed state followed by subsequent calendaring of said web to the desired overall density.
- the resin acts as an interfiber bond inhibitor and fiber stiffener during compression so that the treated portions of the absorbent.
- the web remain at a lower density after calendering than the untreated portions, thereby creating a favorable density and capillary gradient between the resin treated surface and the untreated portions of the web. Because of the hydrophobic nature of the resin, the favorable gradients are maintained when moisture is deposited on the structure, thus providing improved surface dryness on the resin treated surface of the web. in addition, the resin treatment imparts sufficient strength to the absor bent web to resist in use tearing and shredding when the web is employed as an absorbent core in an absorbent structure such as a disposable diaper.
- an absorbent web of the present invention is incorporated in a disposable diaper so that the non-resin treated surface of the web is adhered directly to a soft, waterproof bacltsheet. Due to the inherent softness of the untreated surface of the ab sorbent web, a unique texture and hand which complement softness are produced, while the resin treated surface of the web provides the strength necessary to resist tearing and shredding in use; Because such iaper exhibits improved strength and softness, better compliance and fit are achieved when the structure is applied to the wearer. This in turn provides better containment of discharged wastes and improved wearer comfort.
- a fast strikethrough topsheet is superimposed on the resin treated surface of an absorbent pad of the present invention and secured at its periphery to a waterproof backsheet adhered to the untreated surface of the absorbent pad to form a disposable diaper.
- Such a diaper also exhibits better surface dryness than is normally obtainable when a fast strike-through topsheet is employed due to the tendency of the resin treated surface of the absorbent pad to partition liquid absorbed in the non-resin treated portions of the pad from the topsheet, at least until the full absorptive ca- BRIEF DESCRIPTION OF THE DRAWINGS While the specification concludes with claims particularly pointing out and distinctly claiming the subject matter which is regarded as the present invention, it is believed that the invention will be better understood from the following description taken in connection with the accompanying drawings in which:
- FIG. 1A is a simplified schematic illustration of a portion of a production line used for processing an absorbent fibrous web in accordance with the present invention and for converting the processed web into a disposable diaper.
- FIG. 1B is a continuation of the simplified schematic illustration of FIG. 1A showing the balance of the diaper converting operation.
- FIG. 2 is an enlarged schematic illustration of an uncompressed fibrous web shown prior to processing in accordance with the present invention, taken along section line 22 in FIG. 1A.
- FIG. 3 is an enlarged simplified schematic illustration of the absorbent fibrous web illustrated in FIG. 2 shown after application of the reinforcing resin to the lowermost side thereof, taken along section line 3-3 in FIG.
- FIG. 4 is an enlarged simplified schematic illustration, taken along section line 4-4 in FIG. 1A, illustrating the condition of the absorbent fibrous web shown in FIGS. 2 and 3 after compression of the structure and prior to total encapsulation thereof between the waterproof backsheet adhered to its uppermost surface and the topsheet adjacent its lowermost surface.
- FIG. 5 is an enlarged simplified schematic illustration of a disposable diaper of the present invention taken along section line 5-5 in FIG. 1A, illustrating the condition of the structure after the lateral edge portions of the topsheet have been secured to the lateral edge portions of the waterproof backsheet and the resulting lateral edge portions of the diaper have been folded back upon and secured to the surface of the topsheet.
- FIG. 6 is an enlarged simplified schematic illustration of a disposable diaper of the present invention, taken along section line 6-6 in FIG. 18, showing a preferred configuration of the diaper in the finished state.
- FIGS. 1A and 1B constitute a simplified schematic illustration of a production line suitable for preparing an absorbent fibrous web in accordance with the present invention and for converting said web into a disposable diaper.
- an absorbent fibrous web 1 of hydrophilic cellulosic material is produced by conventional air laying techniques well known in the art and shown schematically as 2 in FIG. 1A.
- the density of the web I typically ranges between approximately 0.03 and approximately 0.05 grams per cubic centimeter, as measured under a load of 20 grams per square centimeter, prior to processing in accordance with the present invention. As shown schematically in FIG. 2, the fibrous structure of the web is extremely loose prior to treatment in accordance with the present invention, and, therefore, the web has very little cohesive strength.
- the first step designed to impart integrity and strength as well as improved surface dryness characteristics to an absorbent web of the present invention involves the application of a film-forming hydrophobic resin to one surface of the absorbent web. This is preferably accomplished by applying the liquid resin 4 with one or more spray nozzles 3 so that a substantially uniform spray extends across the entire width of the absorbent web 1.
- the resin 4 does not penetrate the entire thickness of the absorbent web 1.
- the resin treatment is limited to portion 13(b) of the absorbent web.
- the untreated hydrophilic portion 13(a) of the absorbent web 1 should constitute at least about 50 percent and most preferably at least about; percent of the total thickness of the absorbent web prior to calendering.
- the resin 4 imparts wet strength to the absorbent web by bonding the surface fibers together at contact points while the fibers are in an expanded lattice structure. Since the fibers are randomly distributed in the vertical as well as the horizontal plane and bonded only at contact points, the resulting structure remains flexible.
- the resin coating on the fibers also tends to prevent the formation of additional bonds between the treated fibers during subsequent calendering, thereby insuring the maintenance of flexibility in the web after calendering as well as helping to produce improved surface dryness on the resin treated surface of the web.
- the resin employed is preferably moderately hard and is non-tacky when dry to avoid self-adhering when the absorbent web 1 is calendered.
- One such resin found to produce very good results is styrenebutadiene, a hydrophobic resin available from the Dow Chemical Company of Midland, Mich. under Dow specification number 7284.01.
- Other hydrophobic resins also found suitable include, for example, styrenebutadiene No. 7235 also available from the Dow Chemical Company, and an acrylic-latex resin available from the Rohm and Haas Chemical Company of Philadelphia, Pa. under Rohm and Haas specification number TR-407.
- a distinguishing resin property used commonly by polymer manufacturers in characterizing a resin in its behavior as a film-forming coating is its glass transition temperature.
- the polymer is less tacky and self-adhering at higher glass transition temperatures.
- the resin treated surface 13(b) selfadheres on calendering, the difficulty can frequently be avoided by selecting a resin with a higher glass transition temperature.
- the preferred resins fall within the glass transition temperature range of about lC to about +35C.
- the resin 4 is preferably applied to the absorbent web 1' at relatively low levels of solids addition, i.e., preferably between about 5 and about 16 grams of resin solids per square meter, at a solids content of between about percent and about 55 percent by weight. Low levels of resin application are desirable primarily to avoid adverse effects on the softness, texture and hand of the structure.
- the absorbent web is passed between a hot air blow-through dryer 5 and a suction box-6 which serve to drive moisture from the structure and cure the resin. Both the hot air dryer 5 and the suction box 6 extend across the entire width of the absorbent web 1. Hot air is introduced directly onto the resin treated surface of the web through a plurality of orifices 7 in the hot air dryer 5. Since the web is relatively open at this point, the bulk of the hot air passes through the absorbent web and is collected within the suction box 6 where it is continuously reheated and recycled back to the hot air dryer 5 by means well known in the art.
- the hot air dryer 5 and suction box 6 are preferably designed so that the absorbent web 1 will be dried and cured upon exit therefrom.
- drying and curing can, for example, be achieved with an absorbent fibrous web having a density prior to treatment of approximately 0.05 grams per cubic centimeter as measured under a load of grams per square centimeter, said web having been treated on one surface with a styrene-butadiene resin such as Dow No. 7284.01 applied at a solids content of about 10 percent and a level of approximately 1 1 grams of resin solids per square meter, by directing a forced convection of 270F dry air through the web at a rate of about 450 cubic feet per minute per square foot of web surface for a period of approximately 5 seconds.
- Higher resin solids concentrations and/or higher drying temperatures can be utilized to reduce the residence time required to effect drying and curing.
- a resin treated absorbent web 1 can normally be cured by sub- 5 jecting it to a forced convection of 270F dry air for a period of time sufficient to reduce the moisture content of the structure to below about 5 percent.
- An absorbent fibrous web which has been dried and cured prior to calendering exhibits improvements not only in pad integrity and tensile strength, but, in addition, provides a basis for combining improved strikethrough and surface dryness characteristics in a single absorbent structure such as a disposable diaper.
- An absorbent fibrous web which has been dried but not cured prior to calendering provides a lesser degree of surface dryness improvement.
- the resinstabilized absorbent fibrous web 1 is passed between a pair of hard-surfaced calendering rolls 8 and 9 to increase the overall density of the web to the desired level.
- the initial density of the structure prior to treatment in accordance with the present invention is in the range of about 0.03 to about 0.05 grams per cubic centimeter as measured under a load of 20 grams per square centimeter
- the structure is normally calen dered to an overall density between about 0.07 and about 0.15 grams per cubic centimeter, and most preferably to between about 0.09 and about 0.13 grams per cubic centimeter when the absorbent web 1 is to be utilized in a disposable diaper.
- the target density of the absorbent web is preferably controlled by adjusting the force applied to the web as it passes between the rolls. This is accomplished by mounting roll 9 in a fixed position and controlling the vertical movement of roll 8 by means of a multiplicity of pneumatically or hydraulically actuated cylinders 10 which are regulated to produce a constant compressive force on the web.
- the aforementioned web treatment imparts integrity, cohesiveness and tensile strength to an otherwise weak structure.
- the wet and dry tensile strengths of the absorbent web 1 are dependent to a large extent upon the level of resin application as well as upon the particular resin utilized.
- solids application levels between about 5 and 16 grams per square meter on an absorbent web having a density between about 0.03 and about 0.05 grams per cubic centimeter prior to treatment in accordance with the present invention results in wet tensile strengths between about 0.5 and about 1.5 pounds force per inch of pad width when the treated structure is calendered to a density between about 0.09 and about 0.13 grams per cubic centimeter.
- a force of between about 0.5 and about 1.5 pounds is required to separate a 1 inch wide sample of the web which has been uniformly wetted with a quantity of simulated urine solution equal to four times the weight of the sample.
- the simulated urine solution is comprised of a 1 percent sodium chloride solution adjusted to a surface tension of 45 dynes per centimeter.
- a minimum wet tensile strength of about 0.5 pounds force per inch of pad width, and preferably about 1.0 pounds force per inch of pad width is desirable to resist tearing and shredding.
- This can normally be achieved in an absorbent pad having a basis weight of at least 80 grams per square meter and a density prior to treatment of ap proximately 0.03 to 0.05 grams per cubic centimeter by applying a resin such as Dow styrene-butadiene No. 7284.01 at a rate of approximately 11 grams of solids per square meter and calendering the structure after drying and curing to a density between about 0.09 and about 0.13- grams per cubic centimeter.
- a resin such as Dow styrene-butadiene No. 7284.01
- an absorbent fibrous web 1 which has been cured prior to calendering provides a basis for improved surface dryness and strike-through characteristics in addition to improved strength and integrity when used in an absorbent structure such as a disposable diaper.
- an absorbent fibrous web prepared as herein described exhibits improved surface dryness characteristics on its resin treated surface is due to the fact that favorable density and capillary gradients are created between the treated surface of the web and the untreated portions thereof.
- the resins employed by applicants are interfiber bond inhibitors during compression and because they impart resilience to the fibers which have been treated therewith, the resin treated surface of the web exhibits a lower density than the untreated portions of the absorbent web after calendering.
- the untreated portions of the absorbent core may range from slightly more dense than the resin treated portions of thecore to several times more dense than the resin treated portions of the absorbent core, depending to a large extent on the degree of calendering of the structure. In general, the more favorable the density and capillary gradients between the resin treated surface of theweb and the untreated portions thereof the lower will be the surface wetness values associated therewith.
- the absorbent web 1 is preferably comprised of hydrophilic cellulosic fibers
- the resin 4 in order to maintain the favorable density and capillary gradients described above when the structure is wetted, must not only be hydrophobic in nature, but further, must be of a film-forming variety so as to encapsulate the fibers on the treated surface of the web and prevent them from becoming wetted.
- the favorable density and capillary gradients existing between the resin treated surface of the structure and the untreated portions thereof serve to rapidly transmit the moisture from the resin treated surface to the untreated portions.
- the resin treated fibers of the absorbent web exhibit hydrophobic properties after the resin treatment, they are not readily wetted by liquids deposited on the resin treated portion 13(b) of the absorbent web 1.
- the favorable density and capillary gradients existing between the treated and the untreated portions of the web are not destroyed when the structure is subjected to moisture.
- Liquid deposited on the resin treated surface 13(b) of the absorbent wet I is rapidly transmitted to the absorbent hydrophilic portion of the core 13(a) until the full absorptive capacity of the latter has been exhausted.
- Surface wetness is also reduced, i.e., surface dryness is improved, on the resin treated surface of the web due tothe tendency of liquids absorbed in the hydrophilic core to migrate prefer entially throughout the hydrophilic layer rather than in the direction of the less dense, hydrophobic, resin treated surface of the absorbent web when the web is subjected to pressure in use. Rewetting or flooding of the resin treated surface 13(b) of the web is, therefore, minimized, at least until the full absorptive capacity of the untreated hydrophilic portion 13(a) of the web has been exhausted.
- an absorbent web of the type herein described is particularly well suited to producing a strong, absorbent disposable diaper having unique softness, texture and hand as well as favorable surface dryness characteristics.
- FIGS. 1A and 1B illustrate schematically the processing operations necessary to convert an absorbent fibrous web of the present invention into a disposable diaper having the aforementioned attributes in addition to favorable strike-through characteristics.
- the resinstabilized fibrous web 1 is cut into individual pad segments 13 by means of a rotary cutter 11 having blades 14 secured at its periphery and a hard-surfaced anvil roll 12.
- the individual pad segments 13 are separated to a predetermined spacing by means well known in the art and fed between a layer of waterproof backsheet material 15 and a layer of topsheet material 16.
- One material which has been found particularly suitable for use as a waterproof backsheet is a matte finish polyethylene having a weight of approximately 29,000 square inches per pound, such as is available from the Visqueen Division of the Ethyl Corporation of Terre Haute, Ind.
- glossy finish polyethylenes will function equally well as a moisture barrier to prevent wicking of absorbed liquids from the hydrophilic portion 13(a) of the absorbent pad 13 to the clothing of the wearer, the dull matte finish of the preferred backsheet contributes favorably to the unique softness, texture and hand of applicants diaper.
- the waterproof backsheet 15 is preferably adhered directlyto the untreated surface of the absorbent pad 13 by means of a soft, pressure-sensitive, adhesive 17 applied to the innermost surface of the waterproof backsheet by means of one or more spray nozzles 18.
- a soft, pressure-sensitive, adhesive 17 applied to the innermost surface of the waterproof backsheet by means of one or more spray nozzles 18.
- One suchadhesive found suitable for use in the present invention is Covinax 62 UFP, a polyvinyl acetate base copolymer adhesive available from the Franklin Chemical Company of Columbus, Ohio.
- the topsheet 16 used in a preferred embodiment of the present invention exhibits fast strike-through characteristics when placed in contact with the resin treated surface 13(b) of an absorbent pad 13 of the present invention.
- a topsheet material 16 which exhibits a strike-through time of less than about 5 seconds when placed in contact with the resin treated surface of an absorbent pad of the present invention will produce satisfactory results. This is determined by gently pouring 5 cubic centimeters ofa 1 percent sodium chloride solution adjusted to a surface tension of 45 dynes per centimeter through a 1 inch diameter orifice in a 4 inch X 4 inch X inch thick stainless steel plate placed over a 4 inch X 4 inch sample of the topsheet material superposed on a 4 inch X 4 inch sample of the resin treated absorbent core so that the topsheet is in contact with the resin treated surface of the absorbent core and measuring the amount of time required for the solution to pass through the topsheet and into the absorbent core.
- Low density, high loft, hydrophobic topsheet materials are generally preferred in order to provide both improved strike-through and surface dryness qualities in a disposable diaper of the present invention.
- Excellent results are achievable using, for example, non-woven, needle punched polyester fabrics having a density of about 0.05 grams per cubic centimeter as measured under a load of 20 grams per square centimeter.
- One such material which has proven highly satisfactory in this service is a non-woven, 2% ounce per square yard, needle punched fabric made with 3 denier polyester staple and having a caliper of approximately 0.09 inches, such as is available from Troy Mills of Troy, NH.
- the invention can also be practiced with similarly good results by the use of materials such as: a nonwoven, needle punched fabric made with 6 denier polyester staple and having a caliper of approximately 0.1 1 inches, such as Troy Mills Code No. 3001-007500, also available from Troy Mills; or a non-woven, needle punched fabric made with 6 denier type 209 polyester staple and having a caliper of either 0.08 or 0.09 inches, such as Stearns and Foster grade or grade K material, available from the Stearns and Foster Company of Lockland, Ohio.
- a less expensive material such as Webline No. SW-269-3, available from the Kendall Company of Walpole, Mass, may be utilized.
- the latter material has a basis weight of approximately 22 grams per square meter, a density of approximately 0.16 grams per cubic centimeter as measured under a load of grams per square centimeter, and is comprised of 1.5 denier rayon fibers which are hydrophilic in nature.
- One surface of the Webline material is imprinted by the manufacturer with Rohm and Haas I-IA-8 binder in a diamond-shaped patter constituting approximately percent of the webs surface to impart a degree of hydrophobicity to the material.
- the Webline material although comparable, from a strike-through standpoint, to the preferred topsheet materials cited earlier herein is less desirable than the preferred materials from a surface dryness standpoint.
- the improved surface dryness is attributed to the liquid partitioning properties of the hydrophobic resin treated surface 13(b) which is located immediately adjacent the topsheet 16.
- the aforementioned liquid partitioning properties are due not only to the hydrophobic nature of the resin treated surface 13(b), but also to the favorable density and capillary gradients which exist between the resin treated portion 13(b) and the untreated portion 13(0) of the absorbent pad 13. These factors operate to transmit fluids deposited on the resin treated portion 13(b) rapidly into the untreated portion 13(a) of the pad and to retain the absorbed fluids therein, at least until the absorptive capacity of the untreated portion of the pad has been exhausted.
- an absorbent pad 13 of the present invention combines the ability to absorb and partition moisture within a single, unitary structure, greater flexibility than has heretofore been possible is permitted in the selection of topsheet materlals.
- topsheet materials exhibiting optimum strike-through characteristics may be employed in combination with an absorbent pad 13 of the present invention without producing an unsatisfactory surface dryness condition, such as would be the case if such topsheetlmaterials were applied directly over a non-resin treatqd hydrophilic core.
- an advantage inhererit in applicants structure is that it eliminates the need tb compromise favorable strike-through characteristics in order to provide satisfactory surface dryness charactel istics, a problem apparent in prior art disposable diapell structures.
- the ability to combine fast strike-through and satisfactory surface dryness characteristics in a single structure permits the elimination of gasketing means used in prior art disposable diapers to prevent liquid run-off along the lateral edge portions of the diaper.
- the fast strike-through characteristic of a diaper of the present invention permits fluids deposited on the surface of the topsheet 16 to be transmitted into the absorbent pad 13 before substantial run-off from the surface of the topsheet is allowed to take place.
- Another factor central to the elimination of gasketing means at the lateral edge portions of a disposable diaper of the present invention lies in the unique softness produced by bonding the untreated portion 13(a) of the absorbent pad 13 directly to the waterproof backsheet 15.
- the unique softness of a diaper of the present invention in combination with an absorbent pad 13 having sufficient strength to resist tearing and shredding in use permits better compliance when the structure is applied to the body of the wearer, thereby providing better fit and hence better containment of fluids deposited on the topsheet 16.
- FIG. 4 is an enlarged schematic illustration taken along section line 4-4 in FIG. 1A.
- FIG. 4 depicts the condition of the absorbent pad 13 after calendering and the position of the waterproof backsheet 15 in relation to the topsheet l6.
- Beads of adhesive 19 at the lat eral edge portions of the topsheet 16 are applied by means of a pair of glue applicators 20 located at the lateral edge portions of the topsheet.
- the beads of adhesive 19 are preferably comprised of a hot melt adhesive such as No. 2933 available from the National Starch Company of Plainfield, NJ.
- the beads of adhesive 19 are used to secure the lateral edge portions of the diaper formed by the overlapping edge portions of the backsheet 15 and the topsheet 16 to the surface of the topsheet.
- the lateral edges of the assemblage shown in FIG. 4 are brought into overlapping relation with the topsheet by passing the assemblage between a pair of plows 21 located at the lateral edges thereof.
- the assemblage is then passed between a pair of hard'surfaced rolls 22 and 24 to secure the overlapping portions of the topsheet 16 and the backsheet 15 together as well as to secure the lateral edge portions of the assemblage to the face of the topsheet 16 by means of beads of adhesive 19.
- the topsheet 16 is secured to the backsheet 15 in the area between the absorbent pads 13. This is accomplished, in a preferred embodiment, by providing recessed areas 23 along the periphery of roll 22.
- the recessed areas 23 are of the same basic shape as the absorbent pads 13 and are so positioned along the periphery of roll 22 that the lateral edge portions of the absorbent pads are subjected to compression between rolls.22 and 24 to secure the assemblage together'. This is best illustrated in FIG. 5.
- the areas between adjacent absorbent pads 13, on the other hand, are contacted by the non-recessed portions 25 of roll 22, which, in cooperation with the hard-surfaced roll 24, secure the topsheet 16 directly to the backsheet 15 and the lateral edge portions of the laminate thus formed to the face of the topsheet by means of beads of adhesive 19.
- Securing the lateral edge portions of the diaper to the topsheet 16 in the manner illustrated in FIG. serves to encapsulate the lateral edge portions of the absorbent pad 13, thereby preventing wicking of fluids absorbed in the absorbent pad from its lateral edge portions.
- This construction is preferred, since the waterproof backsheet prevents wetting of clothing which comes in contact with the lateral edge portions of the diaper. Since overlapping the waterproof backsheet 15 onto the surface of the diaper is designed to prevent wicking from the absorbent core rather than run-off from the topsheet in a diaper of the present invention, the amount of overlap of the backsheet onto the surface of the topsheet 16 is preferably minimized to minimize contact between the backsheet and the wearers skin, thereby improving wearer comfort.
- contact between the waterproof backsheet l5 and the wearers skin can be completely eliminated by allowing the overlapping portions of the backsheet 15 and the topsheet 16 to extend horizontally at the edges of the diaper.
- FIG. 1B The balance of the diaper converting operation is illustrated schematically in FIG. 1B.
- the diaper web is passed through folding apparatus well known in the art and shown schematically as 28 in FIG. 18, whereby the diaper web, including the absorbent pads 13, is caused to assume the general configuration illustrated in FIG. 6.
- the diaper web is passed between a rotary knife 29 having blades 30 secured at its periphery and a hard-surfaced anvil roll 31 where the web is cut in register between absorbent pads 13 to form individual disposable diapers 32 of the present invention.
- a method of producing a soft, reinforced body fluid absorbent fibrous web having sufficient strength to resist tearing and shredding when used as an body fluid absorbent core comprising the steps of:
- hydrophobic, film-forming material is comprised of a resin having a glass transition temperature between about -l5C and about +35C, said resin being applied at a level between about 5 grams and about 16 grams of resin solids per square meter of absorbent web.
- a method of producing a soft, reinforced absorbent fibrous web having improved dryness characteristics on one surface thereof comprising the steps of:
- film-forming material is comprised of a resin having a glass transition temperature between about lC and about +35C, said resin being applied at a level between about 5 grams and about l6 grams of resin solids per square meter of absorbent web.
- hydrophobic film-forming material is comprised of a styrenebutadiene resin.
- drying and curing of the treated surface of said absorbent web is accomplished by subjecting said web to a forced convection of warm, dry air for a period of time sufficient to reduce the total moisture content of said absorbent web to below about 5 percent.
- a disposable diaper having improved softness, texture and hand as well as sufficient strength to resist in use tearing and shredding, said diaper including a unitary absorbent pad of varying density and having means for promoting rapid transmission of liquids from the surface receiving said liquids into the interior of said pad, said diaper comprising:
- an absorbent pad of entangled, hydrophilic fibers the fibers on one surface thereof having a coating of a hydrophobic film-forming material thereon, the surface of said absorbent pad containing said coated hydrophilic fibers exhibiting a lower density than the portions of said pad containing uncoated hydrophilic fibers, thereby providing a capillary size gradient favorable to the transmission of liquid from the surface of said absorbent pad containing said coated fibers to the portions of said pad containing said uncoated fibers, said absorbent pad having an overall density between about 0.09 and about 0.13 grams per cubic centimeter as measured under a load of grams per square centimeter and a wet tensile strength of at least about 0.5 pounds per inch of pad width; and
- the disposable diaper of claim 10 including a liquid-pervious topsheet secured in superposed relation to the treated surface of said absorbent pad.
- a disposable diaper exhibiting improved strikethrough and surface dryness characteristics, said diaper including a unitary absorbent pad of varying density and having means for promoting rapid transmission of liquids from the surface receiving said liquids into the interior of said pad, said diaper comprising:
- an absorbent pad of compressed, entangled, hydrophilic fibers the fibers on one surface of said absorbent pad having a coating of a cured, hydrophobic, film-forming material thereon, the surface of said absorbent pad containing said coated hydrophilic fibers exhibiting a lower density than the portions of said pad containing uncoated hydrophilic fibers, thereby providing a capillary size gradient favorable to the transmission of liquid from the surface of said absorbent pad containing said coated fibers to the portions of said pad containing said uncoated fibers, said absorbent pad having an overall density between about 0.09 grams per cubic centimeter and about 0.13 grams per cubic centimeter as measured under a load of 20 grams per square centimeter;
- a liquid-pervious topsheet having a strike-through time of less than about 5 seconds, as measured with said topsheet in adjacent contact with the surface of said absorbent pad containing said coated hydrophilic fibers, secured in superposed relation to the surface of said absorbent pad containing said coated hydrophilic fibers, whereby waste fluids deposited on said topsheet pass rapidly through said topsheet and are absorbed by and partitioned within the portions of said absorbent pad containing said uncoated hydrophilic fibers.
- topsheet is comprised of a low density, high loft, hydrophobic material.
- topsheet is comprised of non-woven, needle-punched polyester fabric having a density of about 0.05 grams per cubic centimeter, as measured under a load of 20 grams per square centimeter.
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Priority Applications (19)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US452095A US3901238A (en) | 1974-03-18 | 1974-03-18 | Disposable diaper having a resin treated absorbent pad to improve integrity, softness and dryness |
US05/550,799 US3955577A (en) | 1974-03-18 | 1975-02-18 | Resin treated absorbent pad or web for body fluids |
AU78719/75A AU7871975A (en) | 1974-03-18 | 1975-03-03 | Disposable diaper |
CA221,724A CA1034353A (en) | 1974-03-18 | 1975-03-10 | Disposable diaper having a resin treated absorbent pad to improve integrity, softness and dryness |
DE19752511141 DE2511141A1 (de) | 1974-03-18 | 1975-03-14 | Fuer wegwerfwindeln geeignete faserbahn und verfahren zu ihrer herstellung |
BE154387A BE826752A (fr) | 1974-03-18 | 1975-03-17 | Couche a jeter a nappe absorbante ayant subi un traitement a la resine destine a la rendre plus resistante, plus souple et plus seche en surface |
NL7503124A NL7503124A (nl) | 1974-03-18 | 1975-03-17 | Wegwerpluier met een, met hars behandeld absor- berend kussen en werkwijze voor de vervaardi- ging daarvan. |
FR7508237A FR2272833B1 (zh) | 1974-03-18 | 1975-03-17 | |
CH333975A CH594374A5 (zh) | 1974-03-18 | 1975-03-17 | |
AT201075A AT346685B (de) | 1974-03-18 | 1975-03-17 | Verfahren zur herstellung einer weichen, einseitig beschichteten, saugfaehigen faserstoffbahn und eine damit hergestellte faserstoffbahn |
IT21334/75A IT1034334B (it) | 1974-03-18 | 1975-03-17 | Pannolino a perdere avente un tampone assorbente trattato con resina per migliorare inegrita morbidezza e secchezza |
SE7502985A SE412686B (sv) | 1974-03-18 | 1975-03-17 | Bloja med forbettrad mjukhet. |
ES435762A ES435762A1 (es) | 1974-03-18 | 1975-03-18 | Procedimiento para producir una cinta continua fibrosa, ab- sorbente reforzada y suave. |
JP50032864A JPS50158451A (zh) | 1974-03-18 | 1975-03-18 | |
DK109975A DK109975A (zh) | 1974-03-18 | 1975-03-18 | |
IE578/75A IE40833B1 (en) | 1974-03-18 | 1975-03-18 | Disposable absorbent product |
GB11246/75A GB1494525A (en) | 1974-03-18 | 1975-03-18 | Disposable absorbent product |
BR1581/75A BR7501581A (pt) | 1974-03-18 | 1975-03-18 | Processo para produzir um tecido fibroso absorvente macio e reforcado tecido assim produzido e fralda descartavel |
LU72073A LU72073A1 (zh) | 1974-03-18 | 1975-03-18 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US452095A US3901238A (en) | 1974-03-18 | 1974-03-18 | Disposable diaper having a resin treated absorbent pad to improve integrity, softness and dryness |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/550,799 Division US3955577A (en) | 1974-03-18 | 1975-02-18 | Resin treated absorbent pad or web for body fluids |
Publications (1)
Publication Number | Publication Date |
---|---|
US3901238A true US3901238A (en) | 1975-08-26 |
Family
ID=23795015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US452095A Expired - Lifetime US3901238A (en) | 1974-03-18 | 1974-03-18 | Disposable diaper having a resin treated absorbent pad to improve integrity, softness and dryness |
Country Status (18)
Country | Link |
---|---|
US (1) | US3901238A (zh) |
JP (1) | JPS50158451A (zh) |
AT (1) | AT346685B (zh) |
AU (1) | AU7871975A (zh) |
BE (1) | BE826752A (zh) |
BR (1) | BR7501581A (zh) |
CA (1) | CA1034353A (zh) |
CH (1) | CH594374A5 (zh) |
DE (1) | DE2511141A1 (zh) |
DK (1) | DK109975A (zh) |
ES (1) | ES435762A1 (zh) |
FR (1) | FR2272833B1 (zh) |
GB (1) | GB1494525A (zh) |
IE (1) | IE40833B1 (zh) |
IT (1) | IT1034334B (zh) |
LU (1) | LU72073A1 (zh) |
NL (1) | NL7503124A (zh) |
SE (1) | SE412686B (zh) |
Cited By (50)
Publication number | Priority date | Publication date | Assignee | Title |
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US3976074A (en) * | 1975-08-08 | 1976-08-24 | Colgate-Palmolive Company | Absorbent article |
US4047531A (en) * | 1976-08-09 | 1977-09-13 | Colgate-Palmolive Company | Absorbent article with differential pad |
US4050463A (en) * | 1976-08-20 | 1977-09-27 | Colgate-Palmolive Company | Diapers |
US4268340A (en) * | 1973-08-05 | 1981-05-19 | Colgate-Palmolive Company | Method of forming an absorbent article |
FR2480113A1 (fr) * | 1980-04-11 | 1981-10-16 | Kimberly Clark Co | Produit hygienique multicouche, tel que serviette hygienique |
US5360419A (en) * | 1989-12-08 | 1994-11-01 | Kimberly-Clark Corporation | Absorbent structure possessing improved integrity |
US5611879A (en) * | 1987-12-18 | 1997-03-18 | Kimberly-Clark Corporation | Absorbent article having an absorbent with a variable density in the Z direction and a method of forming said article |
US5853403A (en) * | 1994-10-25 | 1998-12-29 | Kimberly-Clark Worldwide, Inc. | Absorbent article with body contacting liquid control member |
US6060115A (en) * | 1996-12-17 | 2000-05-09 | Kimberly-Clark Worldwide, Inc. | Method of making an absorbent pad |
WO2001087215A1 (en) * | 2000-05-12 | 2001-11-22 | Bki Holding Corporation | Absorbent structure with integral vapor transmissive moisture barrier |
US20050090173A1 (en) * | 2003-10-24 | 2005-04-28 | The Procter & Gamble Company | Nonwoven materials comprising low density fibers and absorbent articles comprising such fibers |
US20050192550A1 (en) * | 2003-02-28 | 2005-09-01 | Sca Hygiene Products Ab | Absorbent article including an absorbent structure |
WO2005063309A3 (en) * | 2003-12-19 | 2005-11-03 | Bki Holding Corp | Fibers of variable wettability and materials containing the fibers |
US7638014B2 (en) * | 2004-05-21 | 2009-12-29 | Curt G. Joa, Inc. | Method of producing a pants-type diaper |
US7811403B2 (en) | 2005-03-09 | 2010-10-12 | Curt G. Joa, Inc. | Transverse tab application method and apparatus |
US7861756B2 (en) | 2004-04-20 | 2011-01-04 | Curt G. Joa, Inc. | Staggered cutting knife |
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Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS5940405Y2 (ja) * | 1976-01-21 | 1984-11-16 | 日本バイリ−ン株式会社 | 吸水性当材 |
GB2121845B (en) * | 1982-06-10 | 1985-10-30 | Chicopee | Improvements in absorbent pads |
NZ209140A (en) * | 1983-08-15 | 1989-04-26 | Personal Products Co | Absorbent product:batt has water insoluble film on one surface |
JPS61127728U (zh) * | 1985-01-30 | 1986-08-11 | ||
DE102012219409A1 (de) * | 2012-10-24 | 2014-04-24 | Neenah Gessner Gmbh | Filtermaterial mit erhöhter Standzeit und dieses Filtermaterial enthaltendes Filterelement |
CN106983601A (zh) * | 2017-05-18 | 2017-07-28 | 杭州可靠护理用品股份有限公司 | 一种纸尿裤立体护围的成型设备 |
CN107007394A (zh) * | 2017-05-18 | 2017-08-04 | 杭州可靠护理用品股份有限公司 | 纸尿裤立体护围的成型设备 |
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- 1975-03-14 DE DE19752511141 patent/DE2511141A1/de not_active Withdrawn
- 1975-03-17 BE BE154387A patent/BE826752A/xx unknown
- 1975-03-17 NL NL7503124A patent/NL7503124A/xx not_active Application Discontinuation
- 1975-03-17 AT AT201075A patent/AT346685B/de not_active IP Right Cessation
- 1975-03-17 CH CH333975A patent/CH594374A5/xx not_active IP Right Cessation
- 1975-03-17 SE SE7502985A patent/SE412686B/xx unknown
- 1975-03-17 FR FR7508237A patent/FR2272833B1/fr not_active Expired
- 1975-03-17 IT IT21334/75A patent/IT1034334B/it active
- 1975-03-18 LU LU72073A patent/LU72073A1/xx unknown
- 1975-03-18 GB GB11246/75A patent/GB1494525A/en not_active Expired
- 1975-03-18 DK DK109975A patent/DK109975A/da unknown
- 1975-03-18 JP JP50032864A patent/JPS50158451A/ja active Pending
- 1975-03-18 BR BR1581/75A patent/BR7501581A/pt unknown
- 1975-03-18 IE IE578/75A patent/IE40833B1/xx unknown
- 1975-03-18 ES ES435762A patent/ES435762A1/es not_active Expired
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Cited By (70)
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US4268340A (en) * | 1973-08-05 | 1981-05-19 | Colgate-Palmolive Company | Method of forming an absorbent article |
US3976074A (en) * | 1975-08-08 | 1976-08-24 | Colgate-Palmolive Company | Absorbent article |
US4047531A (en) * | 1976-08-09 | 1977-09-13 | Colgate-Palmolive Company | Absorbent article with differential pad |
US4050463A (en) * | 1976-08-20 | 1977-09-27 | Colgate-Palmolive Company | Diapers |
FR2480113A1 (fr) * | 1980-04-11 | 1981-10-16 | Kimberly Clark Co | Produit hygienique multicouche, tel que serviette hygienique |
US5611879A (en) * | 1987-12-18 | 1997-03-18 | Kimberly-Clark Corporation | Absorbent article having an absorbent with a variable density in the Z direction and a method of forming said article |
US5360419A (en) * | 1989-12-08 | 1994-11-01 | Kimberly-Clark Corporation | Absorbent structure possessing improved integrity |
US5635239A (en) * | 1989-12-08 | 1997-06-03 | Kimberly-Clark Worldwide, Inc. | Absorbent structure possessing improved integrity |
US5853403A (en) * | 1994-10-25 | 1998-12-29 | Kimberly-Clark Worldwide, Inc. | Absorbent article with body contacting liquid control member |
US5947947A (en) * | 1996-04-19 | 1999-09-07 | Kimberly-Clark Worldwide, Inc. | Absorbent article with body contacting liquid control member |
US6060115A (en) * | 1996-12-17 | 2000-05-09 | Kimberly-Clark Worldwide, Inc. | Method of making an absorbent pad |
US6470943B1 (en) | 1996-12-17 | 2002-10-29 | Kimberly-Clark Worldwide, Inc. | Apparatus for making an absorbent pad for use in absorbent articles |
WO2001087215A1 (en) * | 2000-05-12 | 2001-11-22 | Bki Holding Corporation | Absorbent structure with integral vapor transmissive moisture barrier |
US20050192550A1 (en) * | 2003-02-28 | 2005-09-01 | Sca Hygiene Products Ab | Absorbent article including an absorbent structure |
US7883497B2 (en) * | 2003-02-28 | 2011-02-08 | Sca Hygiene Products Ab | Absorbent article including an absorbent structure |
US20050090173A1 (en) * | 2003-10-24 | 2005-04-28 | The Procter & Gamble Company | Nonwoven materials comprising low density fibers and absorbent articles comprising such fibers |
US10300457B2 (en) | 2003-12-19 | 2019-05-28 | Georgia-Pacific Nonwovens LLC | Fibers of variable wettability and materials containing the fibers |
US8946100B2 (en) | 2003-12-19 | 2015-02-03 | Buckeye Technologies Inc. | Fibers of variable wettability and materials containing the fibers |
WO2005063309A3 (en) * | 2003-12-19 | 2005-11-03 | Bki Holding Corp | Fibers of variable wettability and materials containing the fibers |
US20060292951A1 (en) * | 2003-12-19 | 2006-12-28 | Bki Holding Corporation | Fibers of variable wettability and materials containing the fibers |
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US8794115B2 (en) | 2007-02-21 | 2014-08-05 | Curt G. Joa, Inc. | Single transfer insert placement method and apparatus |
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US8016972B2 (en) | 2007-05-09 | 2011-09-13 | Curt G. Joa, Inc. | Methods and apparatus for application of nested zero waste ear to traveling web |
US9387131B2 (en) | 2007-07-20 | 2016-07-12 | Curt G. Joa, Inc. | Apparatus and method for minimizing waste and improving quality and production in web processing operations by automated threading and re-threading of web materials |
US8398793B2 (en) | 2007-07-20 | 2013-03-19 | Curt G. Joa, Inc. | Apparatus and method for minimizing waste and improving quality and production in web processing operations |
US8182624B2 (en) | 2008-03-12 | 2012-05-22 | Curt G. Joa, Inc. | Registered stretch laminate and methods for forming a registered stretch laminate |
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US8172977B2 (en) | 2009-04-06 | 2012-05-08 | Curt G. Joa, Inc. | Methods and apparatus for application of nested zero waste ear to traveling web |
US8460495B2 (en) | 2009-12-30 | 2013-06-11 | Curt G. Joa, Inc. | Method for producing absorbent article with stretch film side panel and application of intermittent discrete components of an absorbent article |
US9089453B2 (en) | 2009-12-30 | 2015-07-28 | Curt G. Joa, Inc. | Method for producing absorbent article with stretch film side panel and application of intermittent discrete components of an absorbent article |
US8663411B2 (en) | 2010-06-07 | 2014-03-04 | Curt G. Joa, Inc. | Apparatus and method for forming a pant-type diaper with refastenable side seams |
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US8656817B2 (en) | 2011-03-09 | 2014-02-25 | Curt G. Joa | Multi-profile die cutting assembly |
USD684613S1 (en) | 2011-04-14 | 2013-06-18 | Curt G. Joa, Inc. | Sliding guard structure |
US8820380B2 (en) | 2011-07-21 | 2014-09-02 | Curt G. Joa, Inc. | Differential speed shafted machines and uses therefor, including discontinuous and continuous side by side bonding |
US9237973B2 (en) | 2012-01-31 | 2016-01-19 | Kimberly-Clark Worldwide, Inc. | Treated apertures |
US10751220B2 (en) | 2012-02-20 | 2020-08-25 | Curt G. Joa, Inc. | Method of forming bonds between discrete components of disposable articles |
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US20160317353A1 (en) * | 2013-12-25 | 2016-11-03 | Foshan United Medical Technologies, Ltd. | Wound dressing |
US8801901B1 (en) | 2013-12-30 | 2014-08-12 | Weyerhaeuser Nr Company | Sized fluff pulp |
US10633207B2 (en) | 2015-07-24 | 2020-04-28 | Curt G. Joa, Inc. | Vacuum commutation apparatus and methods |
US10494216B2 (en) | 2015-07-24 | 2019-12-03 | Curt G. Joa, Inc. | Vacuum communication apparatus and methods |
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Also Published As
Publication number | Publication date |
---|---|
IE40833L (en) | 1975-09-18 |
DK109975A (zh) | 1975-09-19 |
BR7501581A (pt) | 1975-12-16 |
LU72073A1 (zh) | 1976-02-04 |
ATA201075A (de) | 1978-03-15 |
FR2272833B1 (zh) | 1980-05-30 |
DE2511141A1 (de) | 1975-10-09 |
BE826752A (fr) | 1975-09-17 |
IT1034334B (it) | 1979-09-10 |
ES435762A1 (es) | 1977-03-16 |
NL7503124A (nl) | 1975-09-22 |
CA1034353A (en) | 1978-07-11 |
AT346685B (de) | 1978-11-27 |
SE7502985L (zh) | 1975-09-19 |
CH594374A5 (zh) | 1978-01-13 |
JPS50158451A (zh) | 1975-12-22 |
IE40833B1 (en) | 1979-08-29 |
FR2272833A1 (zh) | 1975-12-26 |
AU7871975A (en) | 1976-09-09 |
SE412686B (sv) | 1980-03-17 |
GB1494525A (en) | 1977-12-07 |
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