GB2242610A - Disposable diaper in the form of pants - Google Patents

Disposable diaper in the form of pants Download PDF

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Publication number
GB2242610A
GB2242610A GB9105530A GB9105530A GB2242610A GB 2242610 A GB2242610 A GB 2242610A GB 9105530 A GB9105530 A GB 9105530A GB 9105530 A GB9105530 A GB 9105530A GB 2242610 A GB2242610 A GB 2242610A
Authority
GB
United Kingdom
Prior art keywords
diaper
around
side
pair
crotch region
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.)
Withdrawn
Application number
GB9105530A
Other versions
GB9105530D0 (en
Inventor
Hisanori Watanabe
Harumitsu Toyoda
Keiji Abe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kao Corp
Original Assignee
Kao Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to JP2066332A priority Critical patent/JP2927868B2/en
Application filed by Kao Corp filed Critical Kao Corp
Publication of GB9105530D0 publication Critical patent/GB9105530D0/en
Publication of GB2242610A publication Critical patent/GB2242610A/en
Application status is Withdrawn legal-status Critical

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/494Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by edge leakage prevention means
    • A61F13/49406Absorbent 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
    • A61F13/49413Absorbent 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49001Absorbent articles specially adapted to be worn around the waist, e.g. diapers having preferential bending zones, e.g. fold lines or grooves
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007Form-fitting, self-adjusting disposable diapers
    • A61F13/49009Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/49014Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the side panels
    • A61F13/49015Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the side panels the elastic means being elastic panels
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007Form-fitting, self-adjusting disposable diapers
    • A61F13/49009Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/49017Form-fitting, self-adjusting disposable diapers with elastic means the elastic means being located at the crotch region
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/496Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007Form-fitting, self-adjusting disposable diapers
    • A61F13/49009Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/49011Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the waist region
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/491Absorbent articles specially adapted to be worn around the waist, e.g. diapers specially adapted for gender distinct urine discharge pattern
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/495Absorbent articles specially adapted to be worn around the waist, e.g. diapers with faecal cavity
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F2013/4512Absorbent 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 folded in special shape during use
    • A61F2013/4543Absorbent 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 folded in special shape during use with a special transverse section
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/47Sanitary towels, incontinence pads or napkins
    • A61F2013/4708Panty-liner
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F2013/49068Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterized by the shape of the outline
    • A61F2013/49076Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterized by the shape of the outline as "I"-shaped
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F2013/49087Absorbent articles specially adapted to be worn around the waist, e.g. diapers having breakable lateral stitches or panels

Abstract

A disposable diaper of the type which comprises a pair of briefs has a liquid permeable top sheet (2), a liquid impermeable back sheet (3) and an absorbent layer (4) located between the sheets. Elastic members (7, 8) at the front and rear of the waist and around each leg hole provide gathered regions which fit snugly against the wearer. The crotch region of the diaper is folded inwardly and then outwardly so that in section it has the form of a flattened, invented omega shape, and the inward fold is secured. An upwardly open fluid retainment pocket (10) is thereby defined having outwardly directed flaps extending along the top of each side. The areas around each leg hole may optionally be treated with a water repellant substance. An additional elastic member (13) may also be incorporated in the diaper, along vertical seams on each side of the diaper (Fig. 7, not shown). <IMAGE>

Description

DISPOSABLE DIAPERS The invention relates to disposable diapers or nappies of the type which are in the form of a pair of briefs or pants and which may be used for infants or for incontinence purposes.

Conventional disposable diapers (flat diapers) are generally flat and have an adhesive tape fastener with which to fasten the sides of the diaper together around a wearer. Such diapers are designed so that a wearer can easily put on and/or wear a diaper whilst lying down or another person can easily put the diaper onto the wearer. However, such conventional disposable diapers have the following problems. When the wearer is a highly active infant who has just learnt to walk, it is difficult to ensure that the diaper is put on and/or worn correctly and gaps are often formed around the waist and around the legs.Even disposable diapers of the type having gathered regions, e.g. around the waist and leg areas, for preventing leakage of waste material such as urine and the like, do not operate satisfactorily, and it is practically impossible, in use, to achieve complete prevention of leakage from around the waist and/or legs. Another type of disposable diaper has also been proposed in which a target tape or pad is provided on a flap portion of the waist to which the adhesive tape may be fastened and subsequently peeled off and refastened, so that the position, or fit or tightness, of the diaper can be readjusted whilst the diaper is worn. However, this type of diaper also has the problem that, in use, the tape fasteners are easily accidentally unfastened or loosened: e.g. the wearer may unknowingly apply stress to the fastener thereby unfastening it and allowing leakage of waste material.

More recently, a disposable diaper called a "brief type diaper" or "disposable pants" has been developed, in which no tape fastener is used and in which the side portions of the diaper are already connected together.

The diaper thus takes the form of a conventional pair of briefs or pants. An example of such a brief type diaper is described in Japanese Patent Laid-Open Publication No. Sho 58-115106 which discloses a disposable diaper with gathered regions in the parts of the diaper which, in use, will be around the waist and legs of the wearer. Another example of a disposable diaper is described in Japanese Patent Laid-Open Publication No. Sho 62-231005. Here, the diaper has leg holes (leg openings) displaced forwardly from the centre line of the diaper, thereby, in use, preventing gaps forming around the legs of the wearer or the diaper loosening: thus the absorbing ability and general performance of the diaper is enhanced. These brief type diapers are designed so that the wearers can put them on and wear them whilst standing up as with a conventional under garment.The diapers are intended not only for the use of young infants who spend the majority of their time lying down but also for older babies and children, e.g. during toilet training, and for the use of incontinent persons, including adults.

However, a problem with these brief type diapers is that it is difficult, whilst putting on the diaper, to spread the legs of the wearer, so that the diaper fits well in the crotch, when the wearer is standing up. Thus in a brief type disposable diaper, it is practically impossible to provide a sufficiently wide absorbant portion between the legs of the wearer (i.e.

a sufficient distance between the elastic in the gathered regions on each side on the inside of the wearer's legs - the "gather pitch") to prevent leakage as effectively as a flat type diaper. As a result, in use, waste material tends to leak out each side of the crotch region of the diaper because the distance from the part of the diaper into which urine and faeces is discharged to the edge of the diaper is too short.

This problem is more severe when the waste material is faeces, because it is not significantly absorbed by the absorbent material of the diaper.

It is an object of the present invention to provide a brief type disposable diaper which is capable of providing improved prevention of leakage of waste material around the legs of a wearer.

After extensive study of the shape of the crotch portions of brief type disposable diapers, the inventors of the present invention have found that this object may be achieved by a particular configuration of absorbent layer in the crotch region of a diaper.

According to the present invention a disposable diaper in the form of a pair of briefs having a liquid permeable top sheet, a liquid impermeable back sheet and an absorbent layer located between the said sheets and elastic members at the front and rear of the waist of the diaper and around each leg hole (leg opening) of the diaper to gather the diaper at these areas, has an upwardly open pocket in the crotch region formed by folding the absorbent layer, top sheet and back sheet inwardly on each side of the crotch region and folding them outwardly on each side of the crotch region to provide outwardly directed flaps on each side of the pocket.

The pocket of the diaper effectively catches waste material, and the flaps on each side of the pocket engage snugly into the inguinal region of the wearer, creating a good seal.

The gathered regions in the waist and around the leg holes are readily expandable and make putting on the diaper easy and wearing it comfortable.

Furthermore, the gathered regions fit closely around the wearer, preventing leakage of the waste material and ensuring that it is instead caught in the pocket.

Preferably, the diaper has a first pair of preformed parallel fold lines extending longitudinally in the crotch region around which the inward fold is made and a second pair of preformed fold lines in the crotch region extending parallel thereto, around which the outward fold is made.

Normally, the second pair of fold lines are longer than the first pair of fold lines.

Preferably, the portions of the top sheet on each side of the inward fold are connected together.

It is also envisaged that the top sheet may carry a water repellant material in the area around the periphery of each leg hole. Waste material is thereby, in use, prevented from penetrating the top layer in this region and is instead directed into the pocket.

The diaper may have a back sheet whose outer surface comprises a woven or non-woven fibrous material.

The waist may also have further elastic members at each side, which provide a snugger and more secure fit.

The following description of two specific embodiments of diaper in accordance with the invention is given by way of example only with reference to the accompanying drawings in which: Figure 1 is a perspective view of the first embodiment of diaper in accordance with the invention; Figure 2 is a plan view from above of the diaper of Figure 1 before the waist portions have been joined together; Figure 3 is a section taken on line III-III of Figure 2; Figure 4 is a section taken on line IV-IV of Figure 2; Figure 5 is a section taken on line V-V of Figure 2; Figure 6 is a plan view from above of an intermediate stage in the production of the diaper of Figure 1; Figure 7 is a perspective view of a second embodiment of diaper in accordance with the invention; and Figure 8 is a front view of a baby model used in tests.

Referring firstly to Figures 1 to 6, the first embodiment of disposable diaper comprises a liquid permeable top sheet 2, a liquid impermeable back sheet 3, an absorbent layer 4 located between the top sheet 2 and the back sheet 3, and elastic members 7, 8. The elastic members 7, 8 are arranged to create gathered regions around the top of the front and rear waist portions 5 of the diaper and in the areas 6 around the leg holes of the diaper. The absorbent layer 4 does not extend to the gathered regions 5, 6. The diaper is formed from a substantially flat sheet, cut into the shape of a pair of briefs, by bonding together the sides of the front and rear waist portions 5 by means of adhesive, ultrasonic welding, heat welding or the like.

Before the sides of the front and rear waist portions 5 are bonded together, the diaper has an hour glass shape in which the crotch region is narrower than the front and rear waist portions 5 and the central part of the diaper is folded as described below and also deformed by the elastic members 8. The edges of the absorbent layer 4 in the crotch region are folded inwardly through 1800 together with the top sheet 2 and the back sheet 3, in the areas 6 which are to surround the leg holes of the finished diaper. The two superposed layers of the diaper in each area 6 are connected together by any appropriate means and the uppermost layer is then folded back outwardly to form three superposed diaper layers in each area 6, the absorbent layer 4 being of flattened inverted omega shape in cross-section (as shown in Figure 3).The absorbent layer 4 thus folded and secured forms a pocket 10 having side walls provided by the folds with outwardly directed flaps, which may be inclined, extending along each side, provided by the folded portions. The pocket 10 decreases in depth from the crotch region towards the front and rear waist portions 5, until the pocket merges into them (see Figures 4 and 5). Before the pocket 10 is formed, the liquid permeable top sheet 2, the liquid impermeable back sheet 3, the absorbent layer 4 and the elastic members 7, 8 constitute an intermediate product which takes the form of a substantially flat sheet. The intermediate product, as shown in Figure 6, is provided with a pair of first fold lines 11 and a pair of second fold lines 12. The first fold lines 11 are in the crotch region, extending in the fore and aft direction.The second fold lines 12 are located laterally outwardly of the first fold lines: they extend parallel to them but are longer, extending into the front and rear waist portions. The side edges of the absorbent layer 4 are folded inwardly at the first fold lines 11 and the fold secured as previously described. The edges are then folded outwardly at the second fold lines 12, to form the pocket 10.

It is preferable that the maximum width of the absorbent layer 4 is in the range 30mm < ss < 150mm at the pocket 10, the width L at the waist portions 5 is in the range of 50mm < L < 200mm, and the difference L - i between the former and the latter is in the range 20mm < L - St < 100mm. It is more preferable that Q is in the range of 50mm < t < 100mm, L is in the range of 90mm < L < 180mm, and L - Q is in the range of 20mm < L - Q < 80mm. If L is 50mm or less, the distance from the area into which waste material is, in use, discharged to the edge of the diaper is too short and, even given the pocket 10, leakage tends to occur.

If L - ss is 20mm or less, it is difficult to fold the absorbent layer.

The top sheet used in the disposable diaper 1 is liquid permeable to allow waste liquid to permeate to the absorbent layer 4 and preferably has a texture similar to that of an ordinary under garment. The liquid permeable sheet may be a woven fabric, a non-woven fabric, a perforated film or the like. To prevent leakage due to permeation of urine, etc., in the areas 6 around the leg holes, the edges of the areas 6 of the top sheet may be subjected to a water repellant treatment; for example by applying a hydrophobic compound such as an oil solution of a silicon group, paraffin wax or the like to the edges or applying a hydrophilic compound such as an alkyl phosphate and then cleaning the areas using warm water.

The back sheet 3 is liquid impermeable to prohibit waste liquid from passing through, but is permeable to moisture, or vapour. It is also preferable that the back sheet 3 has a texture similar to that of an ordinary under garment. The liquid impermeable sheet may be a composite material comprising a film and a woven fabric, a composite material comprising a film and a non-woven fabric, or a similar material.

The gathered regions around the top of the waist portions 5 and around the leg holes are readily stretched to enable the diaper to be put on easily and worn with comfort. Whilst the diaper is being worn, waste material is effectively caught in the pocket 10 in the crotch region. Moreover, the folded back flaps in the crotch region fit snugly into the inguinal area of the wearer. This feature, in combination with the effect of the gathered regions, ensures the effective prevention of leakage of waste material. Furthermore, leakage can be even more effectively prevented when the diaper has a top sheet which has had a water repellant treatment applied to it in the areas 6 around the leg holes, as described above.

Referring now to Figure 7, a second embodiment of disposable diaper is shown which is exactly the same as the first embodiment except that elastic members or side panels 13 are incorporated into, or attached to the diaper 1 at the join between the front and rear waist portions 5. The elastic members 13 are located between the stOp sheet 2 and the back sheet 3. In use, they expand or contract to accomodate the size and shape of the wearer's waist, so that the diaper is comfortable and secure to wear.

The following test was carried out on a number of samples of diaper in accordance with the invention to determine their effectiveness in preventing leakage.

A diaper was put on a baby model 20 (see Figure 8) and the model was placed in a horizontal position, intended to simulate a baby lying down. Then artificial faeces and artificial urine were supplied through tubes 22 and 23 to outlets in the discharge area 21, to simulate the discharge of real waste material from a baby. The rate of discharge of artificial urine and faeces was maintained at 3 gisec until leakage occurred. The composition of the artificial waste was as follows.

Artificial faeces: Suspension of bentonite of 3wt%, whose viscosity was made up to 10c.p. by the addition of carboxyethyl cellulose.

Artificial urine: Physiological sodium chloride solution.

EXAMPLE 1 In this example, a diaper of the first embodiment in which L was 150mm and the width of the pocket portion was 70mm was tested. The materials used in the diaper were as follows.

Top sheet: Spunbonded non-woven polypropylene fabric having a weight per unit area of 18g/m2.

Back sheet: Uniaxial oriented polyethylene film (weight per unit area 18g/m2).

Absorbent layer: Complex or mixture of pulp and high absorbency polymer material.

EXAMPLE 2 In this example, a diaper of the first embodiment in which L was 100mm and the width of the pocket portion 10 was 50mm was tested. The materials used in this diaper were the same as those in the diaper of Example 1, except that a complex of a moisture permeable polyethylene film (weight per unit area 40g/m2) and spunbonded polypropylene (weight per unit area 12g/m2) was used for the back sheet 3.

EXAMPLE 3 A diaper was tested which had been treated with paraffin wax on the edges of the areas 6 around the leg holes to the make them water repellant. The diaper was in other respects similar to that in Example 1.

EXAMPLE 4 In this example, a diaper of the second embodiment was tested which was in all respects similar to the diaper of Example 1 except that an elastic side panel 13 of polyurethane foam was incorporated at the join between the front and rear waist portions 5.

Comparative Example 1 In this example, a conventional brief type diaper having a flat crotch region with no pocket was tested.

The same materials used in the diaper of Example 1 were used and the maximum width L of the absorbent layer was 150mm.

The results of the five examples are shown in Table 1 below. These show that the diapers in accordance with the invention are capable of absorbing and retaining a larger amount of artificial faeces and artificial urine without leakage than the diaper of Comparative Example 1.

TABLE 1 #Mass of artificial Mass of artificial faces discharged urine discharged into the diaper into the diaper before leakage before leakage (prams) Example 1 70 150 Example 2 60 130 Example 3 90 200 Example 4 70 150 Comparative Example 1 20* 60* *It was observed that the gathered regions around the leg holes did not fit snugly into the inguinal area of the model and a space was formed underneath the crotch of the model.

Although the preferred embodiments of the present invention have been described above, the invention is of course not limited to these embodiments and modifications within the scope of the claims are envisaged.

Claims (8)

1. A disposable diaper in the form of a pair of briefs having a liquid permeable top sheet, a liquid impermeable back sheet and an absorbent layer located between the said sheets and elastic members at the front and rear of the waist of the diaper and around each leg hole of the diaper to gather the diaper at these areas, the diaper having an upwardly open pocket in the crotch region formed by folding the absorbent layer, top sheet and the back sheet inwardly on each side of the crotch region and folding them outwardly on each side of the crotch region to provide outwardly directed flaps on each side of the pocket.
2. A diaper as claimed in Claim 1 having a first pair of preformed parallel fold lines extending longitudinally in the crotch region around which the inward fold is made and a second pair of preformed fold lines in the crotch region extending parallel thereto, around which the outward fold is made.
3. A diaper as claimed in Claim 2 wherein the second pair of fold lines are longer than the first pair of fold lines.
4. A diaper as claimed in any one of the preceding claims wherein the portions of the top sheet on each side of the inward fold are connected together.
5. A diaper as claimed in any one of the preceding claims wherein the top sheet carries a water repellant material in the area around the periphery of each leg hole.
6. A diaper as claimed in any one of the preceding claims wherein the outer surface of the back sheet comprises a woven or non-woven fibrous material.
7. A diaper as claimed in any one of the preceding claims whose front and rear portions are connected together along two connection lines extending from the waist to respective leg holes, further elastic members being provided along each connection line.
8. A diaper substantially as specifically herein described with reference to Figures 1 to 6 or Figure 7 of the accompanying drawings.
GB9105530A 1990-03-16 1991-03-15 Disposable diaper in the form of pants Withdrawn GB2242610A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2066332A JP2927868B2 (en) 1990-03-16 1990-03-16 Disposable diapers

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GB9105530D0 GB9105530D0 (en) 1991-05-01
GB2242610A true GB2242610A (en) 1991-10-09

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Application Number Title Priority Date Filing Date
GB9105530A Withdrawn GB2242610A (en) 1990-03-16 1991-03-15 Disposable diaper in the form of pants

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JP (1) JP2927868B2 (en)
GB (1) GB2242610A (en)

Cited By (12)

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EP0547497A2 (en) * 1991-12-18 1993-06-23 Kimberly-Clark Corporation Disposable three dimensional garment and method of making same
EP0623331A2 (en) * 1993-04-19 1994-11-09 Kao Corporation Shorts type disposable diaper
US5601544A (en) 1993-12-23 1997-02-11 Kimberly-Clark Corporation Child's training pant with elasticized shaped absorbent and method of making the same
WO1997046185A1 (en) * 1996-06-04 1997-12-11 Kao Corporation Absorbent article
US5895382A (en) 1993-04-26 1999-04-20 Kimberly-Clark Worldwide, Inc. Foreshortened containment flaps in a disposable absorbent article
US6102892A (en) * 1996-12-23 2000-08-15 Kimberly-Clark Worldwide, Inc. Diaper with pleats for containment of liquid and solid waste
US6168585B1 (en) 1993-12-15 2001-01-02 Kimberely-Clark Worldwide, Inc. Disposable training pant with elastically suspended absorbent assembly
US6316687B1 (en) 1989-10-04 2001-11-13 Kimberly-Clark Worldwide, Inc. Disposable diaper having a humidity transfer region, Breathable zone panel and separation layer
EP1157681A2 (en) * 2000-05-26 2001-11-28 Uni-Charm Corporation Disposable undergarment
FR2810879A1 (en) * 2000-06-28 2002-01-04 Proteco Disposable diaper or incontinence garment has sides of folded absorbent pad connected to elasticated edges
US6367089B2 (en) 1993-08-31 2002-04-09 Kimberly-Clark Worldwide, Inc. Disposable menstrual panty
US6648869B1 (en) 1996-12-30 2003-11-18 Kimberly-Clark Worldwide, Inc. Vertically pleated diaper liner

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JP5081767B2 (en) * 2008-08-27 2012-11-28 王子ネピア株式会社 The absorbent article
JP2014237913A (en) * 2013-06-05 2014-12-18 真寿美 岩佐 Underpants for large intestine endoscope examination

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GB2163941A (en) * 1981-12-07 1986-03-12 Colgate Palmolive Co Diaper with cushioned elastic leg hold edges
GB2182841A (en) * 1985-10-11 1987-05-28 Procter & Gamble An absorbent article having reservoirs

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US3999547A (en) * 1975-12-29 1976-12-28 Colgate-Palmolive Company Disposable diaper having front side edge sealing means
GB2002237A (en) * 1977-08-10 1979-02-21 Colgate Palmolive Co Disposable diapers
US4317449A (en) * 1980-01-28 1982-03-02 Warner-Lambert Company Disposable adult incontinent brief
GB2108369A (en) * 1981-10-27 1983-05-18 Colgate Palmolive Co Diapers
GB2163941A (en) * 1981-12-07 1986-03-12 Colgate Palmolive Co Diaper with cushioned elastic leg hold edges
GB2182841A (en) * 1985-10-11 1987-05-28 Procter & Gamble An absorbent article having reservoirs

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6316687B1 (en) 1989-10-04 2001-11-13 Kimberly-Clark Worldwide, Inc. Disposable diaper having a humidity transfer region, Breathable zone panel and separation layer
EP0547497A3 (en) * 1991-12-18 1993-08-18 Kimberly-Clark Corporation Disposable three dimensional garment and method of making same
EP0547497A2 (en) * 1991-12-18 1993-06-23 Kimberly-Clark Corporation Disposable three dimensional garment and method of making same
US5836931A (en) * 1993-04-19 1998-11-17 Kao Corporation Shorts type disposable diaper
EP0623331A3 (en) * 1993-04-19 1995-10-25 Kao Corp Shorts type disposable diaper.
EP0623331A2 (en) * 1993-04-19 1994-11-09 Kao Corporation Shorts type disposable diaper
US5895382A (en) 1993-04-26 1999-04-20 Kimberly-Clark Worldwide, Inc. Foreshortened containment flaps in a disposable absorbent article
US6367089B2 (en) 1993-08-31 2002-04-09 Kimberly-Clark Worldwide, Inc. Disposable menstrual panty
US6168585B1 (en) 1993-12-15 2001-01-02 Kimberely-Clark Worldwide, Inc. Disposable training pant with elastically suspended absorbent assembly
US5601544A (en) 1993-12-23 1997-02-11 Kimberly-Clark Corporation Child's training pant with elasticized shaped absorbent and method of making the same
WO1997046185A1 (en) * 1996-06-04 1997-12-11 Kao Corporation Absorbent article
US6551297B2 (en) 1996-06-04 2003-04-22 Kao Corporation Absorbent article
US6102892A (en) * 1996-12-23 2000-08-15 Kimberly-Clark Worldwide, Inc. Diaper with pleats for containment of liquid and solid waste
US6648869B1 (en) 1996-12-30 2003-11-18 Kimberly-Clark Worldwide, Inc. Vertically pleated diaper liner
EP1157681A2 (en) * 2000-05-26 2001-11-28 Uni-Charm Corporation Disposable undergarment
EP1157681A3 (en) * 2000-05-26 2004-09-08 Uni-Charm Corporation Disposable undergarment
FR2810879A1 (en) * 2000-06-28 2002-01-04 Proteco Disposable diaper or incontinence garment has sides of folded absorbent pad connected to elasticated edges

Also Published As

Publication number Publication date
JP2927868B2 (en) 1999-07-28
GB9105530D0 (en) 1991-05-01
JPH03267059A (en) 1991-11-27

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