CA2137114C - Disposable absorbent article - Google Patents
Disposable absorbent articleInfo
- Publication number
- CA2137114C CA2137114C CA002137114A CA2137114A CA2137114C CA 2137114 C CA2137114 C CA 2137114C CA 002137114 A CA002137114 A CA 002137114A CA 2137114 A CA2137114 A CA 2137114A CA 2137114 C CA2137114 C CA 2137114C
- Authority
- CA
- Canada
- Prior art keywords
- liquid
- side flaps
- absorbent core
- topsheet
- stretchable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
- A61F13/49406—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by edge leakage prevention means the edge leakage prevention means being at the crotch region
- A61F13/49413—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by edge leakage prevention means the edge leakage prevention means being at the crotch region the edge leakage prevention means being an upstanding barrier
- A61F13/4942—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by edge leakage prevention means the edge leakage prevention means being at the crotch region the edge leakage prevention means being an upstanding barrier the barrier not being integral with the top- or back-sheet
-
- 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
- A61F13/45—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
- A61F13/495—Absorbent articles specially adapted to be worn around the waist, e.g. diapers with faecal cavity
Abstract
A disposable absorbent article such as a disposable diaper including first stretchable side flaps extending over transversely opposite outer zones of the diaper and second stretchable side flaps functioning as liquid-barriers each having a proximal edge and a distal edge arranged so as to define an exposed zone of a topsheet along each of transversely opposite side edge surfaces of a liquid-absorbent core and thereby, a quantity of liquid excretions possibly having got over the distal edge of the second side flaps can be absorbed by the liquid-absorbent core through the exposed zones.
Description
213711'1 DISPOSABLE ABSORBENT ARTICLE
BACKGROUND OF THE INVENTION
The present invention relates to a disposable absorbent article particularly such as diapers or training pants provided with stretchable side flaps in the form of double cuffs serving to form double seals around respective legs of the wearer.
Japanese Laid-Open patent application No. 1987-250201 discloses a diaper as an example of the above-mentioned disposable absorbent article having double cuffs. Such a diaper includes first stretchable side flaps (gasket cuffs) extending outwards from transversely opposite edges of a liquid-absorbent core and second stretchable side flaps (barrier cuffs) provided on the top surfaces of the respective first stretchable side flaps and each having a proximal edge and a distal edge, intending to eliminate the apprehension that liquid excretions might laterally flow and leak out through the top surface of a topsheet overlying the top surface of said core. According to the disclosure, said second stretchable side flaps may be formed of either liquid-permeable or liquid-impermeable sheet. In view of such disclosure, said excretions of 2137 11'1 .~, which leakage must be avoided is considered to be semi-liquid or semi-solid excretions.
In such a diaper, the proximal edges of the respective second stretchable side flaps are bonded to the top surfaces of the respective first stretchable side flaps extending between the respective side edges of the liquid-absorbent core and the outer stretchable sealing zones of the respective first stretchable side flaps. With this arrangement, a quantity of liquid excretions possibly getting over the distal edges of the second stretchable side flaps will be trapped between the second stretchable side flaps and the sealing zones of the respective first stretchable side flaps and finally may leak outwardly of said sealing zones. While such apprehension is serious particularly when the second stretchable side flaps are formed by liquid-impermeable sheets, it is impossible also for the second stretchable side flaps formed by liquid-permeable sheets to absorb the liquid excretions once trapped and thereby to prevent this from leaking outwardly of said sealing zones of the first stretchable side flaps, since no liquid-permeable sheets having a sufficient absorptivity for the liquid excretions have usually been used to form the second stretchable side flaps.
213711~
Certainly, the relatively low absorptivity typically exhibited by the liquid-permeable sheets will be compensated by the relatively high absorptivity typically exhibited by the absorbent core so far as the second stretchable side flaps are formed by liquid-permeable sheets which are arranged in close contact with the liquid-permeable topsheet along the laterally opposite side edge surfaces of said liquid-absorbent core, since the liquid excretions will be then absorbed by the liquid-absorbent core through the respective second stretchable side flaps.
However, the second stretchable side flaps have not such arrangement in the diaper according to the above-mentioned prior art.
Obviously, liquid excretions may often get over the distal edges of the second stretchable side flaps and the first stretchable side flaps are provided for this reason.
It is a principal object of the invention to arrange the second stretchable side flaps so as to be able not only to dam semi-liquid or semi-solid excretions but also to guide such excretions possibly having got over the distal edges of the second stretchable side flaps into the liquid-absorbent core through its laterally opposite side edges surfaces.
~ ~ 137 1 14 ~
SUMMARY OF THE INVENTION
To achieve the object set forth above, the invention provides a disposable absorbent article having a liquid-permeable topsheet, a liquid-impermeable backsheet, a liquid-absorbent core sandwiched between said topsheet and said backsheet, first stretchable side flaps comprised of portions of said topsheet and said backsheet extending outwards from transversely opposite side edges of said liquid-absorbent core, second stretchable side flaps disposed along the respective side edges of said liquid absorbent core, said second side flaps each having a proximal edge, a distal edge and longitudinally opposite ends 10 fixed in a collapsed state, wherein said second stretchable side flaps substantially function as liquid-barriers and have said proximal edges bonded to a top surface of said topsheet overlying a top surface of said liquid-absorbent core, and said first stretchable side flaps, outwardly adjacent said side edges, have top surfaces covered with side sheets functioning as liquid-barriers to prevent diffusion of liquid excretions from said liquid-absorbent core which is liquid-permeable along surfaces of said transverse opposite side edges of said core cover sheet centrally provided with an opening extending in a longitudinal direction thereof, said cover sheet covering an outer peripheral zone of the topsheet as well as the longitudinally opposite ends of the respective second stretchable side flaps, an 20 outer peripheral zone of said cover sheet is bonded to said outer peripheral zone of the topsheet as well as to said longitudinally opposite ends of the respective second stretchable side flaps and wherein respective outer side zones of said cover sheet define said side sheets.
.'~' 28657-7 213711~
Preferably, the portions of said topsheet extending outwards from the laterally opposite side edges of the liquid-absorbent core so as to constitute part of the respective first side flaps are narrower than the portions of said backsheet extending from said opposite side edges of said liquid-absorbent core so as to constitute part of said first stretchable side flaps and the outermost side edges of respective side sheets extend to the corresponding outermost side edges of said portions of the backsheet extending from said laterally opposite side edges of the liquid-absorbent core with no portion of the topsheet being interposed between the backsheet and the respective side sheets over the outer zones of said first stretchable side flaps.
Preferably, a cover sheet centrally provided with an opening extending in its longitudinal direction and functioning as a liquid-barrier covers the outer peripheral zone of the topsheet as well as longitudinally opposite ends of the respective second stretchable flaps and the outer peripheral zone of said cover sheet is bonded to said outer peripheral zone of the topsheet as well as to said longitudinally opposite ends of the respective second stretchable side flaps so that respective outer side zones 21~711 1 ....
of said cover sheet define said side sheets.
With the absorbent article according to the invention, the quantity of liquid excretions having got over said distal edges of said second stretchable side flaps, i.e., the quantity of liquid excretions having leaked out along paths defined between said distal edges and the wearer's skin is trapped between said portions of the topsheet covering said liquid-absorbent core along its laterally opposite side edge surfaces and the respective sealing zones extending along the outer edges of said first stretchable side flaps around the wearer's legs and this quantity of liquid excretions is then at least partially guided into said liquid-absorbent core through its laterally opposite side edge surfaces under the relatively high absorptivity of said liquid-absorbent core. In this manner, such liquid excretions can be held by said liquid-absorbent core for a relatively long period, reducing the apprehension that the liquid excretions might directly get the wearer's skin so as to give the wearer an unpleasant feeling and leak outwards of said first stretchable side flaps.
Certainly, the quantity of liquid excretions once absorbed by the liquid-absorbent core may soak out again 213711~
through said side edge surfaces thereof since the topsheet is exposed and remains liquid-permeable along said side edge surfaces. However, said second stretchable side flaps are provided primarily to dam up semi-liquid or semi-solid excretions and a quantity of such excretions having soaked out again through said side edge surfaces of the liquid-absorbent core, as has previously been described, can be at least partially absorbed again by the liquid-absorbent core through said side edge surfaces at which said soaking out has occurred. The disadvantage accompanying such arrangement of the invention is rather acceptable when it is compared to the previously mentioned disadvantage accompanying the arrangement of the prior art according to which the liquid excretions are trapped between said second stretchable side flaps and the sealing zones of said first stretchable side flaps and prevented from smoothly moving toward the liquid-absorbent core.
In view of its desired function, each second stretchable side flap must have its distal edge located at a predetermined height above the top surface of the topsheet overlying the top surface of the liquid-absorbent core and, according to the invention, this requirement is effectively met by bonding said proximal edge to the top 213711~
, surface of the topsheet overlying the top surface of the liquid-absorbent core. Such arrangement according to the invention allows said second stretchable side flap to be dimensioned lower (narrower) than in the arrangement having said proximal edge bonded to the associated first stretchable side flap. In this way, the arrangement according to the invention allows the material cost to be reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail by way of example in reference with the accompanying drawing, in which:
Fig. 1 is a developed plan view of a disposable diaper as an embodiment of the invention; and Fig. 2 is a fragmentary perspective sectional view taken along a line X - X in Fig. 1.
PREFERRED EMBODIMENTS OF THE INVENTION
Referring to Figs. 1 and 2, a diaper comprising a liquid-permeable topsheet 1, a liquid-impermeable backsheet 2, a liquid-absorbent core 3 sandwiched between the top-and backsheets 1, 2 and first side flaps 4 each being 213711~
."~, formed by portions of the top- and backsheets 1, 2 extending outwards from transversely opposite side edges of the liquid-absorbent core 3, and outer side zones of a cover sheet 15 as will be described in more detail. The topsheet 1 is dimensioned to be narrower than the backsheet so that transversely opposite side edges of the backsheet 2 extend beyond the corresponding side edges of the topsheet 1. The top- and backsheets 1, 2 are bonded together by means of adhesive, heat welding or ultrasonic welding at least along their peripheral zones overlapping each other. Between the portions of the backsheet 2 extending outwards beyond the side edges of the topsheet 1 and transversely opposite outer zones of the cover sheet 15 there is provided an elastic members 5, respectively, serving to make the first side flaps 4 elastically stretchable longitudinally thereof. Portions of the top-and backsheets 1, 2 extending outward from longitudinally opposite ends of the liquid-absorbent core 3 form together end flaps 6 contain between these sheets elastic members 7, respectively, serving to make these end flaps 7 elastically stretchable transversely thereof.
The diaper further comprises second side flaps 10 each having a proximal edge 8 and a distal edge 9 to serve 213711~
as substantially moisture-permeable liquid-barrier. The second side flaps 10 have their proximal edges 8 bonded to the top surface of the topsheet 1 overlying the top surface of the liquid-absorbent core 3 by means of adhesive, heat welding or ultrasonic welding so that the topsheet 1 is exposed along the laterally opposite side edge surfaces of the liquid-absorbent core 3. The zones of the topsheet 1 exposed in this manner along the laterally opposite side edge surfaces of the liquid-absorbent core 3 are designated by reference numeral 11 in Fig. 2. Folded edges defining the respective distal edges 9 contain an elastic member 12 to make these distal edges 9 elastically stretchable longitudinally thereof. The second side flaps 10 are collapsed inwards and bonded to the top surface of the topsheet 1 by means of adhesive, heat welding or ultrasonic welding at their longitudinally opposite ends as they are stretched longitudinally thereof so that they are normally biased to rise under their contraction.
The diaper further comprises the previously mentioned cover sheet 15 centrally provided with an opening 14 extending longitudinally thereof and substantially serving as a liquid-barrier. The cover sheet 15 is bonded at least its outer peripheral zone to the top surface of the 213711'1 -topsheet 1 and the longitudinally opposite ends 13 of the respective second side flaps 10 by means of adhesive, heat welding or ultrasonic welding. With the components bonded together in this manner, in addition to the exposed zones 11, intermediate zones of the respective second side flaps 10 except said longitudinally opposite ends 13 as well as the intermediate zone defined between the second side flaps 10 are exposed, and transversely opposite side edges 16 of the opening 14 substantially coincide with the laterally opposite side edges of the liquid-absorbent core 3 at its bottom. The width of each exposed zone 11 is preferably dimensioned to be less than 5mm in order to minimize soaking out of liquid excretions possibly taking place through this zone 11. When it is desired to dimension the height or thickness of the liquid-absorbent core 3 to be less than 5mm, it is preferred to dimension the laterally opposite side edges at its bottom to be lower or thinner than its remaining portion. The use of the cover sheet 15 is advantageous in that the peripheral zone of the diaper's top (i.e., inner) surface can serve as a liquid-barrier alleviating the diffusion of liquid excretions. Another feature of the invention that the liquid-impermeable backsheet 2 and the liquid-barrier cover sheet 15 are directly bonded together along the transversely opposite outer side zones with no portion of the topsheet interposed therebetween is advantageous in that no soaking out of liquid excretions can occur between the backsheet 2 and the cover sheet 15.
When the second side flaps 10 vertically rise, the outermost edges of their distal edges 9 have preferably their height dimension above the top surface of the respective first side flaps 4 less than the width dimension of the respective first side flaps 4. It is also possible to collapse the longitudinally opposite ends 13 of the second side flaps lO outwards, instead of collapsing inwards as in the embodiment described herein, before they are bonded to the top surface of the topsheet 1 without departure from the scope of the invention. However, said ends 13 are preferably collapsed inwards in order to assure that the distal edges 9 of the second side flaps 10 should not extend beyond the outer side edges of the respective first side flaps 4 even when the respective second side flaps 10 are forcibly collapsed by the wearer's thighs further outwards. The second side flaps 10 preferably have a flexibility higher than a flexibility of the first side flaps 4 and the elastic members 12 associated with the .
former preferably have a stretching stress lower than a stretching stress of the elastic members 5 associated with the latter. It is desirable that the second side flaps 10 are sufficiently flexible to protect the wearer's groins ~ from pain and marks due to a pressure, since the distal edges 9 of the second side flaps 10 are normally kept in contact with the wearer's groins.
Though not illustrated and as will be apparent without illustration, it is also possible that the cover sheet 15 is not used and sheets (referred to hereinafter as side sheets) corresponding to the respective side zones 17 cut off from said cover sheet 15 are bonded to the corresponding zones of the respective first side flaps 4.
It should be understood that the inner side edges of these side sheets or the side edges 16 of the opening 14 may be bonded or not bonded to the top surface of the topsheet 1.
A rear waist section of the diaper is provided at transversely opposite ends with pressure-sensitive adhesive tape fasteners 18 adapted to be detachably fixed on the outer surface of a front waist section. It should be understood that the invention is applicable not only to a so-called open type diaper as has been described hereinabove but also to a so-called closed type or pant ' 213711~
type diaper (not shown) having front and rear waist sections welded to each other at transversely opposite ends thereof.
To execute the invention, materials well known for such article may be used. For example, the topsheet 1 may be formed by a nonwoven fabric made of hydrophobic fibers or a porous plastic film, the backsheet 2 may be formed by a plastic film which is liquid-impermeable but moisture-permeable, the liquid-absorbent core 3 may be formed by fluff pulp mixed with superabsorbent polymer powders, the second side flaps 10 as well as the cover sheet 15 may be formed by a nonwoven fabric made of hydrophobic fibers (water-proofed, if it is necessary), and the elastic members 5, 7, 12 may be formed by natural or synthetic rubber and elastomer.
BACKGROUND OF THE INVENTION
The present invention relates to a disposable absorbent article particularly such as diapers or training pants provided with stretchable side flaps in the form of double cuffs serving to form double seals around respective legs of the wearer.
Japanese Laid-Open patent application No. 1987-250201 discloses a diaper as an example of the above-mentioned disposable absorbent article having double cuffs. Such a diaper includes first stretchable side flaps (gasket cuffs) extending outwards from transversely opposite edges of a liquid-absorbent core and second stretchable side flaps (barrier cuffs) provided on the top surfaces of the respective first stretchable side flaps and each having a proximal edge and a distal edge, intending to eliminate the apprehension that liquid excretions might laterally flow and leak out through the top surface of a topsheet overlying the top surface of said core. According to the disclosure, said second stretchable side flaps may be formed of either liquid-permeable or liquid-impermeable sheet. In view of such disclosure, said excretions of 2137 11'1 .~, which leakage must be avoided is considered to be semi-liquid or semi-solid excretions.
In such a diaper, the proximal edges of the respective second stretchable side flaps are bonded to the top surfaces of the respective first stretchable side flaps extending between the respective side edges of the liquid-absorbent core and the outer stretchable sealing zones of the respective first stretchable side flaps. With this arrangement, a quantity of liquid excretions possibly getting over the distal edges of the second stretchable side flaps will be trapped between the second stretchable side flaps and the sealing zones of the respective first stretchable side flaps and finally may leak outwardly of said sealing zones. While such apprehension is serious particularly when the second stretchable side flaps are formed by liquid-impermeable sheets, it is impossible also for the second stretchable side flaps formed by liquid-permeable sheets to absorb the liquid excretions once trapped and thereby to prevent this from leaking outwardly of said sealing zones of the first stretchable side flaps, since no liquid-permeable sheets having a sufficient absorptivity for the liquid excretions have usually been used to form the second stretchable side flaps.
213711~
Certainly, the relatively low absorptivity typically exhibited by the liquid-permeable sheets will be compensated by the relatively high absorptivity typically exhibited by the absorbent core so far as the second stretchable side flaps are formed by liquid-permeable sheets which are arranged in close contact with the liquid-permeable topsheet along the laterally opposite side edge surfaces of said liquid-absorbent core, since the liquid excretions will be then absorbed by the liquid-absorbent core through the respective second stretchable side flaps.
However, the second stretchable side flaps have not such arrangement in the diaper according to the above-mentioned prior art.
Obviously, liquid excretions may often get over the distal edges of the second stretchable side flaps and the first stretchable side flaps are provided for this reason.
It is a principal object of the invention to arrange the second stretchable side flaps so as to be able not only to dam semi-liquid or semi-solid excretions but also to guide such excretions possibly having got over the distal edges of the second stretchable side flaps into the liquid-absorbent core through its laterally opposite side edges surfaces.
~ ~ 137 1 14 ~
SUMMARY OF THE INVENTION
To achieve the object set forth above, the invention provides a disposable absorbent article having a liquid-permeable topsheet, a liquid-impermeable backsheet, a liquid-absorbent core sandwiched between said topsheet and said backsheet, first stretchable side flaps comprised of portions of said topsheet and said backsheet extending outwards from transversely opposite side edges of said liquid-absorbent core, second stretchable side flaps disposed along the respective side edges of said liquid absorbent core, said second side flaps each having a proximal edge, a distal edge and longitudinally opposite ends 10 fixed in a collapsed state, wherein said second stretchable side flaps substantially function as liquid-barriers and have said proximal edges bonded to a top surface of said topsheet overlying a top surface of said liquid-absorbent core, and said first stretchable side flaps, outwardly adjacent said side edges, have top surfaces covered with side sheets functioning as liquid-barriers to prevent diffusion of liquid excretions from said liquid-absorbent core which is liquid-permeable along surfaces of said transverse opposite side edges of said core cover sheet centrally provided with an opening extending in a longitudinal direction thereof, said cover sheet covering an outer peripheral zone of the topsheet as well as the longitudinally opposite ends of the respective second stretchable side flaps, an 20 outer peripheral zone of said cover sheet is bonded to said outer peripheral zone of the topsheet as well as to said longitudinally opposite ends of the respective second stretchable side flaps and wherein respective outer side zones of said cover sheet define said side sheets.
.'~' 28657-7 213711~
Preferably, the portions of said topsheet extending outwards from the laterally opposite side edges of the liquid-absorbent core so as to constitute part of the respective first side flaps are narrower than the portions of said backsheet extending from said opposite side edges of said liquid-absorbent core so as to constitute part of said first stretchable side flaps and the outermost side edges of respective side sheets extend to the corresponding outermost side edges of said portions of the backsheet extending from said laterally opposite side edges of the liquid-absorbent core with no portion of the topsheet being interposed between the backsheet and the respective side sheets over the outer zones of said first stretchable side flaps.
Preferably, a cover sheet centrally provided with an opening extending in its longitudinal direction and functioning as a liquid-barrier covers the outer peripheral zone of the topsheet as well as longitudinally opposite ends of the respective second stretchable flaps and the outer peripheral zone of said cover sheet is bonded to said outer peripheral zone of the topsheet as well as to said longitudinally opposite ends of the respective second stretchable side flaps so that respective outer side zones 21~711 1 ....
of said cover sheet define said side sheets.
With the absorbent article according to the invention, the quantity of liquid excretions having got over said distal edges of said second stretchable side flaps, i.e., the quantity of liquid excretions having leaked out along paths defined between said distal edges and the wearer's skin is trapped between said portions of the topsheet covering said liquid-absorbent core along its laterally opposite side edge surfaces and the respective sealing zones extending along the outer edges of said first stretchable side flaps around the wearer's legs and this quantity of liquid excretions is then at least partially guided into said liquid-absorbent core through its laterally opposite side edge surfaces under the relatively high absorptivity of said liquid-absorbent core. In this manner, such liquid excretions can be held by said liquid-absorbent core for a relatively long period, reducing the apprehension that the liquid excretions might directly get the wearer's skin so as to give the wearer an unpleasant feeling and leak outwards of said first stretchable side flaps.
Certainly, the quantity of liquid excretions once absorbed by the liquid-absorbent core may soak out again 213711~
through said side edge surfaces thereof since the topsheet is exposed and remains liquid-permeable along said side edge surfaces. However, said second stretchable side flaps are provided primarily to dam up semi-liquid or semi-solid excretions and a quantity of such excretions having soaked out again through said side edge surfaces of the liquid-absorbent core, as has previously been described, can be at least partially absorbed again by the liquid-absorbent core through said side edge surfaces at which said soaking out has occurred. The disadvantage accompanying such arrangement of the invention is rather acceptable when it is compared to the previously mentioned disadvantage accompanying the arrangement of the prior art according to which the liquid excretions are trapped between said second stretchable side flaps and the sealing zones of said first stretchable side flaps and prevented from smoothly moving toward the liquid-absorbent core.
In view of its desired function, each second stretchable side flap must have its distal edge located at a predetermined height above the top surface of the topsheet overlying the top surface of the liquid-absorbent core and, according to the invention, this requirement is effectively met by bonding said proximal edge to the top 213711~
, surface of the topsheet overlying the top surface of the liquid-absorbent core. Such arrangement according to the invention allows said second stretchable side flap to be dimensioned lower (narrower) than in the arrangement having said proximal edge bonded to the associated first stretchable side flap. In this way, the arrangement according to the invention allows the material cost to be reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail by way of example in reference with the accompanying drawing, in which:
Fig. 1 is a developed plan view of a disposable diaper as an embodiment of the invention; and Fig. 2 is a fragmentary perspective sectional view taken along a line X - X in Fig. 1.
PREFERRED EMBODIMENTS OF THE INVENTION
Referring to Figs. 1 and 2, a diaper comprising a liquid-permeable topsheet 1, a liquid-impermeable backsheet 2, a liquid-absorbent core 3 sandwiched between the top-and backsheets 1, 2 and first side flaps 4 each being 213711~
."~, formed by portions of the top- and backsheets 1, 2 extending outwards from transversely opposite side edges of the liquid-absorbent core 3, and outer side zones of a cover sheet 15 as will be described in more detail. The topsheet 1 is dimensioned to be narrower than the backsheet so that transversely opposite side edges of the backsheet 2 extend beyond the corresponding side edges of the topsheet 1. The top- and backsheets 1, 2 are bonded together by means of adhesive, heat welding or ultrasonic welding at least along their peripheral zones overlapping each other. Between the portions of the backsheet 2 extending outwards beyond the side edges of the topsheet 1 and transversely opposite outer zones of the cover sheet 15 there is provided an elastic members 5, respectively, serving to make the first side flaps 4 elastically stretchable longitudinally thereof. Portions of the top-and backsheets 1, 2 extending outward from longitudinally opposite ends of the liquid-absorbent core 3 form together end flaps 6 contain between these sheets elastic members 7, respectively, serving to make these end flaps 7 elastically stretchable transversely thereof.
The diaper further comprises second side flaps 10 each having a proximal edge 8 and a distal edge 9 to serve 213711~
as substantially moisture-permeable liquid-barrier. The second side flaps 10 have their proximal edges 8 bonded to the top surface of the topsheet 1 overlying the top surface of the liquid-absorbent core 3 by means of adhesive, heat welding or ultrasonic welding so that the topsheet 1 is exposed along the laterally opposite side edge surfaces of the liquid-absorbent core 3. The zones of the topsheet 1 exposed in this manner along the laterally opposite side edge surfaces of the liquid-absorbent core 3 are designated by reference numeral 11 in Fig. 2. Folded edges defining the respective distal edges 9 contain an elastic member 12 to make these distal edges 9 elastically stretchable longitudinally thereof. The second side flaps 10 are collapsed inwards and bonded to the top surface of the topsheet 1 by means of adhesive, heat welding or ultrasonic welding at their longitudinally opposite ends as they are stretched longitudinally thereof so that they are normally biased to rise under their contraction.
The diaper further comprises the previously mentioned cover sheet 15 centrally provided with an opening 14 extending longitudinally thereof and substantially serving as a liquid-barrier. The cover sheet 15 is bonded at least its outer peripheral zone to the top surface of the 213711'1 -topsheet 1 and the longitudinally opposite ends 13 of the respective second side flaps 10 by means of adhesive, heat welding or ultrasonic welding. With the components bonded together in this manner, in addition to the exposed zones 11, intermediate zones of the respective second side flaps 10 except said longitudinally opposite ends 13 as well as the intermediate zone defined between the second side flaps 10 are exposed, and transversely opposite side edges 16 of the opening 14 substantially coincide with the laterally opposite side edges of the liquid-absorbent core 3 at its bottom. The width of each exposed zone 11 is preferably dimensioned to be less than 5mm in order to minimize soaking out of liquid excretions possibly taking place through this zone 11. When it is desired to dimension the height or thickness of the liquid-absorbent core 3 to be less than 5mm, it is preferred to dimension the laterally opposite side edges at its bottom to be lower or thinner than its remaining portion. The use of the cover sheet 15 is advantageous in that the peripheral zone of the diaper's top (i.e., inner) surface can serve as a liquid-barrier alleviating the diffusion of liquid excretions. Another feature of the invention that the liquid-impermeable backsheet 2 and the liquid-barrier cover sheet 15 are directly bonded together along the transversely opposite outer side zones with no portion of the topsheet interposed therebetween is advantageous in that no soaking out of liquid excretions can occur between the backsheet 2 and the cover sheet 15.
When the second side flaps 10 vertically rise, the outermost edges of their distal edges 9 have preferably their height dimension above the top surface of the respective first side flaps 4 less than the width dimension of the respective first side flaps 4. It is also possible to collapse the longitudinally opposite ends 13 of the second side flaps lO outwards, instead of collapsing inwards as in the embodiment described herein, before they are bonded to the top surface of the topsheet 1 without departure from the scope of the invention. However, said ends 13 are preferably collapsed inwards in order to assure that the distal edges 9 of the second side flaps 10 should not extend beyond the outer side edges of the respective first side flaps 4 even when the respective second side flaps 10 are forcibly collapsed by the wearer's thighs further outwards. The second side flaps 10 preferably have a flexibility higher than a flexibility of the first side flaps 4 and the elastic members 12 associated with the .
former preferably have a stretching stress lower than a stretching stress of the elastic members 5 associated with the latter. It is desirable that the second side flaps 10 are sufficiently flexible to protect the wearer's groins ~ from pain and marks due to a pressure, since the distal edges 9 of the second side flaps 10 are normally kept in contact with the wearer's groins.
Though not illustrated and as will be apparent without illustration, it is also possible that the cover sheet 15 is not used and sheets (referred to hereinafter as side sheets) corresponding to the respective side zones 17 cut off from said cover sheet 15 are bonded to the corresponding zones of the respective first side flaps 4.
It should be understood that the inner side edges of these side sheets or the side edges 16 of the opening 14 may be bonded or not bonded to the top surface of the topsheet 1.
A rear waist section of the diaper is provided at transversely opposite ends with pressure-sensitive adhesive tape fasteners 18 adapted to be detachably fixed on the outer surface of a front waist section. It should be understood that the invention is applicable not only to a so-called open type diaper as has been described hereinabove but also to a so-called closed type or pant ' 213711~
type diaper (not shown) having front and rear waist sections welded to each other at transversely opposite ends thereof.
To execute the invention, materials well known for such article may be used. For example, the topsheet 1 may be formed by a nonwoven fabric made of hydrophobic fibers or a porous plastic film, the backsheet 2 may be formed by a plastic film which is liquid-impermeable but moisture-permeable, the liquid-absorbent core 3 may be formed by fluff pulp mixed with superabsorbent polymer powders, the second side flaps 10 as well as the cover sheet 15 may be formed by a nonwoven fabric made of hydrophobic fibers (water-proofed, if it is necessary), and the elastic members 5, 7, 12 may be formed by natural or synthetic rubber and elastomer.
Claims (2)
1. A disposable absorbent article having a liquid-permeable topsheet, a liquid-impermeable backsheet, a liquid-absorbent core sandwiched between said topsheet and said backsheet, first stretchable side flaps comprised of portions of said topsheet and said backsheet extending outwards from transversely opposite side edges of said liquid-absorbent core, second stretchable side flaps disposed along the respective side edges of said liquid absorbent core, said second side flaps each having a proximal edge, a distal edge and longitudinally opposite ends fixed in a collapsed state, wherein said second stretchable side flaps substantially function as liquid-barriers and have said proximal edges bonded to a top surface of said topsheet overlying a top surface of said liquid-absorbent core, and said first stretchable side flaps, outwardly adjacent said side edges, have top surfaces covered with side sheets functioning as liquid-barriers to prevent diffusion of liquid excretions from said liquid-absorbent core which is liquid-permeable along surfaces of said transverse opposite side edges of said core cover sheet centrally provided with an opening extending in a longitudinal direction thereof, said cover sheet covering an outer peripheral zone of the topsheet as well as the longitudinally opposite ends of the respective second stretchable side flaps, an outer peripheral zone of said cover sheet is bonded to said outer peripheral zone of the topsheet as well as to said longitudinally opposite ends of the respective second stretchable side flaps and wherein respective outer side zones of said cover sheet define said side sheets.
2. The article according to claim 1, wherein the portions of said topsheet extending outwards from the transversely opposite side edges of the liquid-absorbent core to constitute part of the respective first side flaps are narrower than the portions of said backsheet extending from said opposite side edges of said liquid-absorbent core so as to also constitute part of said first stretchable side flaps, and wherein outermost side edges of the respective side sheets extend from said laterally opposite side edges of the liquid-absorbent core and are bonded directly to the backsheet with no portion of the topsheet being interposed between the backsheet and the respective side sheets in outer zones of said first side flaps.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5-302929 | 1993-12-02 | ||
| JP30292993A JP3564157B2 (en) | 1993-12-02 | 1993-12-02 | Disposable absorbent articles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2137114A1 CA2137114A1 (en) | 1995-06-03 |
| CA2137114C true CA2137114C (en) | 1999-06-01 |
Family
ID=17914837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002137114A Expired - Fee Related CA2137114C (en) | 1993-12-02 | 1994-12-01 | Disposable absorbent article |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US5662637A (en) |
| EP (1) | EP0664997B1 (en) |
| JP (1) | JP3564157B2 (en) |
| KR (1) | KR0139667Y1 (en) |
| CN (1) | CN2209514Y (en) |
| AU (1) | AU686674B2 (en) |
| CA (1) | CA2137114C (en) |
| DE (1) | DE69424641T2 (en) |
| ES (1) | ES2145813T3 (en) |
| MY (1) | MY112122A (en) |
| PH (1) | PH31525A (en) |
| SG (1) | SG67303A1 (en) |
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| US6786895B1 (en) * | 1999-07-02 | 2004-09-07 | The Procter & Gamble Company | Disposable absorbent article having barrier means, and method of its manufacture |
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| WO2001039713A1 (en) * | 1999-12-01 | 2001-06-07 | Toyo Eizai Kabushiki Kaisha | Disposable diaper |
| US6524293B1 (en) | 1999-12-17 | 2003-02-25 | Kimberly-Clark Worldwide, Inc. | Prefastened disposable absorbent articles having a stretch panel |
| US6551294B1 (en) | 1999-12-17 | 2003-04-22 | Kimberly-Clark Worldwide | Disposable absorbent articles having a stretch panel and an integrated waist size adjustment mechanism |
| US6454752B1 (en) | 2000-03-17 | 2002-09-24 | Kimberly-Clark Worldwide, Inc. | Pre-fastened adjustable mechanical fastener garment |
| JP3734694B2 (en) * | 2000-09-01 | 2006-01-11 | ユニ・チャーム株式会社 | Pants-type disposable diapers |
| US6579275B1 (en) | 2000-09-28 | 2003-06-17 | Kimberly-Clark Worldwide, Inc. | Pant-like disposable absorbent articles with releasable seams and a folded fastening feature |
| US6508797B1 (en) | 2000-11-03 | 2003-01-21 | Kimberly-Clark Worldwide, Inc. | Pant-like disposable absorbent articles with a releasable line of weakness and a fastener |
| US6620270B2 (en) | 2001-12-18 | 2003-09-16 | Kimberly-Clark Worldwide, Inc. | Control of processing force and process gap in rigid rotary ultrasonic systems |
| US6676003B2 (en) | 2001-12-18 | 2004-01-13 | Kimberly-Clark Worldwide, Inc. | Rigid isolation of rotary ultrasonic horn |
| US6537403B1 (en) | 2001-12-18 | 2003-03-25 | Kimberly-Clark Worldwide, Inc. | Nip adjustment for a rigid ultrasonic bonder or processor |
| US6613171B2 (en) | 2001-12-18 | 2003-09-02 | Kimberly-Clark Worldwide, Inc. | Rotary ultrasonic bonder or processor capable of fixed gap operation |
| US6547903B1 (en) | 2001-12-18 | 2003-04-15 | Kimberly-Clark Worldwide, Inc. | Rotary ultrasonic bonder or processor capable of high speed intermittent processing |
| US20040002690A1 (en) | 2002-07-01 | 2004-01-01 | The Procter & Gamble Company | Disposable absorbent article having elasticized outer leg cuff |
| US20050065489A1 (en) * | 2003-09-24 | 2005-03-24 | Driskell Stacy J. | Disposable Absorbent Artcle with Wetness Indicator |
| US7794441B2 (en) * | 2004-04-14 | 2010-09-14 | The Procter & Gamble Company | Dual cuff for a unitary disposable absorbent article being spaced away from backsheet |
| US20050234411A1 (en) * | 2004-04-14 | 2005-10-20 | The Procter & Gamble Company | Dual cuff for a unitary disposable absorbent article made of a continuous cuff material |
| US20070118089A1 (en) * | 2005-11-23 | 2007-05-24 | The Procter & Gamble Company | Disposable absorbent article having backsheet strips |
| US7432413B2 (en) | 2005-12-16 | 2008-10-07 | The Procter And Gamble Company | Disposable absorbent article having side panels with structurally, functionally and visually different regions |
| US8491558B2 (en) * | 2006-03-31 | 2013-07-23 | The Procter & Gamble Company | Absorbent article with impregnated sensation material for toilet training |
| US8664467B2 (en) | 2006-03-31 | 2014-03-04 | The Procter & Gamble Company | Absorbent articles with feedback signal upon urination |
| US7896858B2 (en) | 2006-12-04 | 2011-03-01 | The Procter & Gamble Company | Absorbent articles comprising graphics |
| JP5225893B2 (en) * | 2009-02-27 | 2013-07-03 | 株式会社リブドゥコーポレーション | Disposable absorbent article |
| JP5266407B1 (en) * | 2012-03-30 | 2013-08-21 | ユニ・チャーム株式会社 | Disposable diapers |
| WO2013170433A1 (en) | 2012-05-15 | 2013-11-21 | The Procter & Gamble Company | Absorbent article having characteristic waist end |
| KR101717217B1 (en) * | 2012-09-24 | 2017-03-16 | 다이오세이시가부시끼가이샤 | Absorbent article provided with novel leg gathers |
| RU2651437C2 (en) | 2013-03-22 | 2018-04-19 | Дзе Проктер Энд Гэмбл Компани | Disposable absorbent products |
| US9322797B1 (en) | 2014-04-30 | 2016-04-26 | Helvetia Wireless Llc | Systems and methods for detecting a liquid |
| US9506886B1 (en) | 2014-04-30 | 2016-11-29 | Helvetia Wireless Llc | Systems and methods for detecting a liquid |
| US9366644B1 (en) * | 2014-04-30 | 2016-06-14 | Helvetia Wireless Llc | Systems and methods for detecting a liquid |
| EP4166119A1 (en) * | 2021-10-18 | 2023-04-19 | Gülkan Sahin | Post-operative body dressing |
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| US4846823A (en) * | 1984-07-02 | 1989-07-11 | Kimberly-Clark Corporation | Diapers with elasticized side pockets |
| US4695278A (en) * | 1985-10-11 | 1987-09-22 | The Procter & Gamble Company | Absorbent article having dual cuffs |
| JPS6468503A (en) * | 1987-09-07 | 1989-03-14 | Uni Charm Corp | Disposable diaper |
| JPH02174845A (en) * | 1988-12-27 | 1990-07-06 | Daio Paper Corp | Paper diaper |
| CA2031435A1 (en) * | 1989-12-19 | 1991-06-20 | Dan Darold Endres | Conformable absorbent article |
| JP2824859B2 (en) * | 1989-12-20 | 1998-11-18 | 王子製紙株式会社 | Disposable diapers |
| JPH03286760A (en) * | 1990-04-03 | 1991-12-17 | Kao Corp | Absorptive article and its production |
| JPH0499921A (en) * | 1990-08-20 | 1992-03-31 | Tokico Ltd | Mass flowmeter |
| JP2935135B2 (en) * | 1990-10-12 | 1999-08-16 | 王子製紙株式会社 | Manufacturing method of disposable diapers |
| MY117258A (en) * | 1990-11-30 | 2004-06-30 | Kao Corp | Diaper |
| JP2908877B2 (en) * | 1990-11-30 | 1999-06-21 | 花王株式会社 | Absorbent articles |
| JP2892843B2 (en) * | 1990-12-18 | 1999-05-17 | ユニ・チャーム株式会社 | Disposable wearing articles |
| JPH084020Y2 (en) * | 1991-04-10 | 1996-02-07 | ユニ・チャーム株式会社 | Disposable diapers |
| JP3107862B2 (en) * | 1991-08-15 | 2000-11-13 | ユニ・チャーム株式会社 | Manufacturing method of disposable pants |
| CA2057739A1 (en) * | 1991-09-11 | 1993-03-12 | Kimberly-Clark Worldwide, Inc. | Disposable diaper having differentially stretchable ears with childproof fastening |
| US5192606A (en) * | 1991-09-11 | 1993-03-09 | Kimberly-Clark Corporation | Absorbent article having a liner which exhibits improved softness and dryness, and provides for rapid uptake of liquid |
| SE9103851L (en) * | 1991-12-30 | 1993-07-01 | Moelnlycke Ab | ABSORBING ALSTER |
| JP3372051B2 (en) * | 1992-05-15 | 2003-01-27 | 花王株式会社 | Disposable diapers |
-
1993
- 1993-12-02 JP JP30292993A patent/JP3564157B2/en not_active Expired - Lifetime
-
1994
- 1994-11-29 PH PH49467A patent/PH31525A/en unknown
- 1994-11-30 AU AU79100/94A patent/AU686674B2/en not_active Ceased
- 1994-11-30 US US08/351,190 patent/US5662637A/en not_active Expired - Lifetime
- 1994-12-01 SG SG1996002839A patent/SG67303A1/en unknown
- 1994-12-01 CA CA002137114A patent/CA2137114C/en not_active Expired - Fee Related
- 1994-12-01 EP EP94308930A patent/EP0664997B1/en not_active Expired - Lifetime
- 1994-12-01 ES ES94308930T patent/ES2145813T3/en not_active Expired - Lifetime
- 1994-12-01 DE DE69424641T patent/DE69424641T2/en not_active Expired - Lifetime
- 1994-12-02 KR KR2019940032657U patent/KR0139667Y1/en not_active IP Right Cessation
- 1994-12-02 CN CN94216382U patent/CN2209514Y/en not_active Expired - Lifetime
- 1994-12-02 MY MYPI94003220A patent/MY112122A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| US5662637A (en) | 1997-09-02 |
| EP0664997B1 (en) | 2000-05-24 |
| DE69424641T2 (en) | 2001-02-08 |
| MY112122A (en) | 2001-04-30 |
| CA2137114A1 (en) | 1995-06-03 |
| DE69424641D1 (en) | 2000-06-29 |
| AU686674B2 (en) | 1998-02-12 |
| PH31525A (en) | 1998-11-03 |
| KR0139667Y1 (en) | 1999-04-01 |
| KR950016709U (en) | 1995-07-20 |
| EP0664997A1 (en) | 1995-08-02 |
| CN2209514Y (en) | 1995-10-11 |
| SG67303A1 (en) | 1999-09-21 |
| JPH07148200A (en) | 1995-06-13 |
| JP3564157B2 (en) | 2004-09-08 |
| ES2145813T3 (en) | 2000-07-16 |
| AU7910094A (en) | 1995-06-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20141201 |