JPH06254119A - Disposable shorts type diaper with improved preventive structure for leakage from circumference of leg - Google Patents

Abstract

PURPOSE: To product leakage around legs by providing a diaper with an absorptive chassis, elastic side panels and a leakage prevention belt around legs. CONSTITUTION: The absorptive chassis 30 having a rectangular shape is equipped with a liquid permeable top sheet put aside the body, a liquid impermeable back sheet and an absorptive core to absorb liquid excreta from the body. Elastic side panels 5 extend out from both sides lengthwise to the shorter rim direction of the absorptive chassis 30 respectively on its front waist area and rear waist area equipped with expansion and contraction free pair of elastic side panel means 10. Leakage prevention belt around legs 80 is processed covering the whole crotch area, say, the front waist area and the rear waist area having the crotch area between them. This constitution makes it possible to prevent leakage around the legs.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to disposable absorbent articles, more specifically disposable absorbent diapers and incontinence products, and most particularly disposable pants diapers.

[0002]

2. Description of the Related Art Pant-type diapers have become popular and are used especially for infants during toilet-traning. In the past, pant diapers can be elastically stretched using elastic elements placed in the pant diaper so that the waist and leg spaces are at least partially wrapped with an elasticizing band. It was like this. This method of using elastic elements is described in Repke et al., US Pat. No. 4,205,6.
No. 79, 4,610, 680 to Lafleur, Strohb
No. 4,610,681 to een et al., No. 4,641,381 to Heran et al., No. 4,90 to Douglas. Sr.
No. 9,804 and 4,960,414 to Meyer.

Other methods of elasticizing disposable pant diapers are all described in Van Ganpel et al., US Pat. No. 4,490,
464, 4,938,753 and 4,93
No. 8,757. These patents disclose a pant-like garment formed by attaching separate elastic members to the side edges of the main portion of the garment. Separate stretchable members stretch the elastic or stretchable layer to a selected elongation, place a non-stretchable layer such as a non-woven fabric on the stretched layer, bond the layers together, and gather the non-stretchable layers It is described as being made by relaxing layers.

Another method of making elastic members is 1978.
Patent No. 4,10 issued to Sisson on August 15, 2010
7,364, US Pat. No. 4,209,563 issued to Sisson on June 24, 1980, US Pat. No. 4,525,40 issued to Ness on June 25, 1985.
No. 7, U.S. Pat. No. 4,834,741 issued to Sabee on May 30, 1989, and European Patent Publication No. 409,315 to Procter & Gamble, Inc. issued on January 23, 1991. , All of which are incorporated herein by reference.

Yet another method of making elastic members is US Patent Application No. 07 / 662536,07 / 662537.
And 07/662543, each of which was filed on February 28, 1991, with Procter and Gamble Company as the applicant. These references describe making elasticized laminates by mechanically stretching an unstretched stretch laminate web to impart elasticity in the stretch direction to at least the point of initial stretch. The stretchable, non-elastic nonwoven is first bonded to the liquid impermeable elastic layer in its relaxed state to form a laminated web. The laminated web is then fed between a pair of opposed pressure applicators, preferably applicators having three-dimensional surfaces that are oriented to varying degrees relative to each other, to provide increased mechanical stretching (or desired). Such non-uniform or subsequent mechanical stretching, whereby the stretchable nonwoven is permanently stretched in the direction of stretching. When mechanical stretching is removed, the elastic layer causes the laminate to substantially return to its pre-stretched shape and dimensions, thereby elastically stretching the non-elastomeric laminate in the direction of initial stretching. .

[0006]

As described above, the pants-type diaper has the above-mentioned lateral extension panel, that is, the elastic side panel, and therefore the absorbent chassis including the absorbent core has a substantially rectangular shape. . further,
In order to substantially function the functions of the elastic side panels provided on both sides of the rectangular absorbent chassis, the side flaps of the absorbent chassis, that is, the flexible parts on both sides of the absorbent core, for example, the sides of the absorbent core, are used. It is difficult to make the extended back sheet wide. This is because, if the side flaps are configured to be wide, for example, the width of the elastic side panel becomes short, the required amount of expansion and contraction cannot be obtained, and the elastic side panel is not positioned in the necessary area. Because of this, the side flaps become narrower, and therefore it is difficult to realize a configuration in which the leg flap leakage prevention structure is directly incorporated into the side flaps.

The present invention has been proposed in view of the above problems, and an object thereof is to provide a pants-type diaper having an improved leg leakage prevention structure that does not rely on a side flap that cannot be configured to be wide. To do.

[0008]

A pants-type diaper having an improved leg leakage prevention structure according to the present invention comprises a liquid-permeable top sheet disposed on the body side, a liquid-impermeable back sheet, and A front waist region and a rear waist region that are disposed between the top sheet and the back sheet and that absorb the liquid discharge from the human body, and that are substantially rectangular and that form the front and rear waist regions; An absorbent chassis having a crotch region located between the front waist region and the rear waist region and forming a crotch portion, and both sides in the longitudinal direction in the front waist region and the rear waist region of the absorbent chassis. At least the front, which extends outward in the direction of the short side of the absorbent chassis and connects the side portions of the front waist region and the rear waist region to each other to form a pants shape. Elastic side panels that can expand and contract in the short side direction, and elastic bands that are elastic in at least the longitudinal direction added to both sides in the longitudinal direction of the absorbent chassis, and are configured to cover at least the entire crotch region. A leg leakage prevention band that opens outward from a short side of the absorbent chassis is provided.

[0009]

EXAMPLE A pants-type diaper as an example of the present invention will be described below. FIG. 1 shows an external view of the training pants, and FIG. 6 shows a development view of the training pants. This training pants has an absorbent chassis 30 and elastic side panels 5
And a suspension leakage prevention band 80. The absorbent chassis 30 is a liquid-permeable topsheet 33 arranged on the body side.
A liquid impermeable backsheet 32, and an absorbent core 31 disposed between the topsheet 33 and the backsheet 32 to absorb liquid discharge from the human body. This absorbent chassis has a substantially rectangular shape and is located between the front waist region 40 and the rear waist region 41, which form the front and rear waist regions, and is located between the front waist region 40 and the rear waist region 41. And a crotch region 45 constituting the same. In each of the front waist region 40 and the rear waist region 41 of the absorbent chassis 30, the elastic side panel 5 extends from both sides in the longitudinal direction to the outside in the short side direction of the absorbent chassis 30 and is elastic in the short side direction. A set of two elastic side panel elements 10a, 10b (hereinafter denoted by reference numeral 10 unless otherwise specified). Details of each of the above elements will be described later. The leg leakage prevention band 80 is provided over the entire crotch region 45 of the absorbent chassis 30. In the embodiment, the leg leakage prevention band 80 is provided across the front waist region 40 and the rear waist region 41 with the crotch region 45 sandwiched therebetween.

FIG. 7 shows a cross-sectional view of the leg leakage prevention band 80. The training pants of the embodiment have an inward elasticized barrier leg cuff 55 and a leg leakage prevention band 8 as a leakage prevention structure.
With 0 and. Although the leg leakage prevention band 80 may be configured separately from the inward elasticized barrier leg cuff 55, the preferred embodiment here is the leg leakage prevention band 80 and the inward elasticized barrier leg cuff 55. The structure of the training pants having the leakproof structure integrally formed will be described. This leakproof structure has a breathable breathable sheet 81.
And a plurality of elastic strips 83, 85, 87, which are elastic in the longitudinal direction, here three elastic strips. The wide breathable sheet 81 extends over both the inside and the outside of the side of the absorbent core 31. The edge of the breathable sheet 81 extending inward is folded back to the absorbent core 31 side, and one elastic strip 83 is included between the folded piece 89 and the folded piece 89 in a state of being stretched in the longitudinal direction in advance. Preferably, in the cuff 55, the end portion of the folded piece 89 of the breathable sheet 81 is joined to the breathable sheet 81 itself by an adhesive agent or the like to form the tubular portion 9.
The elastic strip 83 is provided in the tubular portion 91 of the breathable sheet 81 at least in the crotch region 45, and a free state in which the movement of the elastic strip 83 does not restrict the breathable sheet 81 is obtained. The front waist region 40 of the inward elasticized barrier leg cuff 55
In the portion located in the rear waist region 41, the elastic strip 83 is adhered to the breathable sheet of the tubular portion 91, and the inward elasticized barrier leg cuff 55 is attached to the top sheet 33 by various adhesives or the like. It is fixed by the method. On the other hand, the breathable sheet 81 that constitutes the inward elasticized barrier leg cuff 55 extends toward the outer side of the short side of the absorbent chassis 30, and the extended portion is widely folded back toward the elastic side panel element 10 side. The leg leakage preventing band 80 is composed of the folded piece 93 and the two elastic strips 85 and 87 sandwiched therebetween. Surrounding leakproof zone 80
The two elastic strips 85 and 87 are fixed to the breathable sheet itself with an adhesive or the like in a state in which the two elastic strips 85 and 87 are preliminarily extended over substantially the entire longitudinal direction. The folding piece 93 is
A configuration folded back to the wearer side (opposite to the side panel element 10 side) is also conceivable. The breathable sheet 81 positioned between the leg leakage prevention band 80 and the inward elasticized barrier leg cuff 55 is a back sheet that is slightly wider than the top sheet 30 from the longitudinal edge portion 30a of the top sheet 33. The edges 32a of 32 are joined by an adhesive or the like. Since the elastic side panel element 10 is bonded to the edge portion 32a of the back sheet 32 in the front waist region 40 and the rear waist region 41 with an adhesive or the like (described in detail later), the ventilation sheet 81 has the elastic side panel element. 10
Is bonded to the upper surface of the adhesive with an adhesive or the like. The portions of the leg leakage prevention band 80 located in the front waist region 40 and the rear waist region 41 are such that the corresponding portions of the inward elasticized barrier leg cuffs 55 are tacked down, that is, joined to the top sheet 33. It may be configured to be tacked down to the side or tacked down to the elastic side panel element 10. As a preferred embodiment, in the configuration of the present drawing, the corresponding portion of the leg leakage prevention band 80 is a free end that does not tuck down.

Next, the configuration of each of the other parts will be described.

Elasticizing member 10 (elastic side panel element)
Is typically a laminated web 11 having at least one stretchable non-elastic nonwoven layer 12 having at least one elastic layer 13.
The laminated web 11 while the two are in a relaxed state.
Of the non-elasticized laminate by stretching the mechanically stretched portion in the width of the web to impart elasticity to the web in the stretch direction at least to the point of initial stretching, resulting in a stretched laminated web 14 Is cut along its width and its length to form the individual front waist and rear elasticizing members 10 of the side panels 5.

Representative examples of stretchable non-elastic nonwoven layers 12 include hydrophobic nonwoven carded webs having a basis weight in the range of about 30 to 37 g / m ² , and Hercules In
c. Includes about 1-5 denier fiber available from USA.

The elastic layer 13 is liquid permeable or liquid impermeable and is, for example, a spunbonded polymeric non-woven fabric or a plastic film. A representative elastic layer 13 includes polyurethane having a caliper of about 0.050 mm thickness or no-load.
As an example, Japan Synthetic Rubber K.K. K. Made by D
There is S-320C.

The non-elastic nonwoven layer and the elastic layer are joined and joined to form a laminate 11. The adhesive to join the layers is
It can be applied as a uniform continuous layer of adhesive, a patterned layer of adhesive, an array of separate lines, a helix, or dots of adhesive. In a preferred embodiment, the selected adhesive is extensible and the adhesive applicator is a melt blown application system such as J &
Includes Model No. GM-50-2-1-GH, available from M Laboratories of Gainesville, Georgia, USA, and measured in a direction transverse to the machine direction, 8 openings per cm length (20 openings per inch). Nozzles each having a diameter of about 0.5 mm (0.0020 inch). An example of a preferred adhesive is St. Paul,
H available from HB Fuller of Minnesota, USA
M-6515 hot melt adhesive. Adhesive is about 1
Heated to 70 ° C. and applied at about 0.75-1.25 mg / cm ² . Heated compressed air at a temperature of about 220 ° C. and a pressure of about 2500 mm Hg gauge is expelled through the secondary openings of the nozzle to aid in uniform distribution of adhesive fibrils during the laydown operation.

Laminated web 11 as outlined in FIG.
Is then mechanically stretched to stretch along the width of the web region 15 of the elasticized laminate and the glue region 20 of the unstretched, non-elasticized laminate. Typically, a web having a width W of about 1 m is simultaneously fed to the stretcher. An apparatus for mechanically stretching a strain-free stretch laminate 11 consists of an upper corrugated roll 60 and a lower corrugated roll 61 assembled such that their respective corrugations engage (as further shown in FIG. 3). Become. The area 15 of the web passed through the upper and lower corrugated rolls is mechanically stretched mechanically in the area between the grooves 62 of the upper corrugated roll 60 and the grooves 63 of the lower corrugated roll 61. Region 2 of the web passed between the side-by-side side-by-side corrugated rolls 60 spaced apart
0 does not undergo any mechanical stretching.

To prevent the web from shrinking in a direction parallel to the direction of stretch as the web passes between the intermeshing rolls, a means for tightening the web is used just outside of each region of mechanical stretch. It is preferable. A suitable means of preventing such shrinkage is shown in FIG. There, a compressible disc 65 having a diameter slightly larger than the diameter of the upper corrugating roll is mounted adjacent each side of the groove portion of the upper corrugating roll. The compressible disc is the web,
Firmly grasp and hold the web securely against the matching non-grooved portion 64 of the lower corrugated roll 61.

In the present invention, mechanically stretched regions 15 and unstretched regions 20 alternate along the width of the web. The width of the region 15 to be mechanically stretched (indicated by X) is similar to the desired waist opening of the training pants and the elasticity of the stretched laminate, as well as to the individual side elasticizing members 10.
Selection is made based on the degree to which the processed web 14 is cut after stretching. For example, the processed web 14 is
For example, with a knife, cut along its width proximate to the center of each of the non-mechanically stretched regions 20. Next, as shown in FIG. 4, the individual widths of each of the processed laminates are:
A first side elasticizing member 10a for attachment to the absorbent chassis, cut substantially in half at the center of the mechanically stretched region and cut into individual lengths L along the length of the web. Form a set of second side elasticizing members 10b to form side seams. Depending on the size of the pants-type diaper being made, the width X can be 60-140 mm. For example,
For an L size pant diaper intended for use by an infant weighing 9-14 kg, the width X is about 70-100 mm, more preferably 74-90 mm, and in a particularly preferred embodiment the width X is about 85 mm. is there. Thus, after cutting into individual lengths of web approximately in the center of region X, the width of the elasticized laminate portion 16 of the individual side elasticizing members in this embodiment will be about 30-70 mm. In the above L size pants-type diaper, the width X is about 35 to 50 mm, and more preferably,
It is 37 to 45 mm, specifically about 42.5 mm.

The width of the non-mechanical stretch zone 20 of the web (shown as Y) is preferably about 20-120 mm.
In the case of the L size pants-type diaper, the width Y is about 20 to
70 mm, more preferably 40 to 66 mm, especially about 60 mm. Since the web is divided in the middle of the region Y to form individual web widths, the non-mechanically stretched outer edge portion 51 of the elasticizing member has a width of about 10 to 60 mm, and the L size pant diaper described above is used. In this case, Y / 2 is about 10 to 35 mm, more preferably 20 to 33 mm, and especially about 30 mm.

The length L of each elasticizing member is about 50 to 190 mm.
Is preferred. As with the other dimensions of the elasticizing member, the length L selected will be the size of the intended wearer,
And suitability and comfort requirements. In the case of the L size pants type diaper described above, the length L is about 80 to 1.
70 mm, more preferably about 100-160 mm.

The absorbent chassis 30 is generally formed by placing an absorbent core 31 between a liquid impermeable backsheet 32 and a liquid permeable topsheet 33. The absorbent chassis of the present invention is generally rectangular and has side ends 35a, 35b and ends 36a, 36b, a front waist 40 and a rear waist 41.

The absorbent core 31 is generally compressible, conformable, non-irritating to the wearer's skin, and capable of absorbing and retaining liquids such as urine and certain other body exudates. Any absorbent means may be used. The absorbent core has a garment surface, a body surface, side edges and a waist edge. Absorbent cores come in a variety of sizes and shapes (eg, rectangular, hourglass,
"T" shape, asymmetrical shape, etc.), but also of various liquid absorbent materials commonly used in disposable diapers and other absorbent articles, such as ground wood pulp, commonly referred to as airfelt. it can. Examples of other suitable absorbent materials include wrinkled cellulosic cotton wadding, meltblown polymers containing crosslinked cellulosic fibers, tissue papers including leaflet packaging and leaflet laminates, absorbent foams, absorbent sponges, and There is an absorbent polymer, absorbent gelling material, or equivalent material or combination thereof. The shape or structure of the absorbent core can also be varied (e.g., the absorbent core may have various thickness zones, hydrophilic gradients, superabsorbent gradients, or low average densities and low average basis weight acquisition zones, It may include one or more layers or structures). However, the total absorbent capacity of the absorbent core should match the design load and intended use of the diaper. Further, the size and absorbent capacity of the absorbent core can be varied to accommodate wearers from infants to adults.

In one embodiment of the present invention, the absorbent core 31 is an acquisition / distribution core and a storage core (both not shown).
Comprising two different webs or layers including. The acquisition / distribution core is located between the topsheet and the storage sheet, and the storage core is located between the acquisition / distribution core and the backsheet. The acquisition / dispensing wick preferably has a cotton area which is 15% to 170% of the cotton area of the storage core.

The acquisition / distribution core is preferably positioned relative to the storage core so that the surface does not cross the boundaries of the storage core. The acquisition / distribution core preferably comprises a web of chemically cured cellulosic fibers, but the physical integration of the web with the addition of binders such as uncured cellulosic fibers, synthetic fibers, chemical additives, thermoplastic fibers. The sex can be strengthened.
The storage core preferably comprises an airlaid web of superabsorbent material and fibrous material, preferably air felt. Optionally, and most preferably,
A permeable sheet (eg, between the acquisition / distribution core and the storage core)
Thin sheets) or other scrims may be placed to enhance the integrity of the absorbent core during processing and / or use.

The acquisition / distribution core rapidly collects body fluids,
It serves to quickly transport the liquid from the initial contact point of the acquisition / dispensing wick to other parts and temporarily hold such excreted body fluid until it is absorbed by the storage wick. The distribution function of the acquisition / dispensing wick is particularly important in order to more fully utilize the capacity of the storage wick. Thus, the acquisition / distribution wick may comprise various absorbent materials, but rapidly transports the bodily fluid so that the acquisition / distribution wick can effectively acquire and distribute the subsequent excretion of the bodily fluid. It is preferable to utilize a minimal amount (less than 2%) of superabsorbent material, which comprises a fibrous material that can be wetted and does not disintegrate when wet (due to slow uptake and gel blocking).

The backsheet 32 is liquid (eg, urine) impermeable and is preferably made from a thin plastic film, although other flexible liquid impermeable materials may be used.

The term "flexible" as used herein refers to a material that is supple and readily conforms to the general shape and contours of the human body. The back sheet is absorbed by the absorbent core and prevents the exudate contained therein from wetting articles that come into contact with diapers such as bed sheets and underwear.
Thus, the backsheet may comprise a woven or non-woven material, a polymeric film such as a thermoplastic film of polyethylene or polypropylene, or a composite material such as a thin film coated non-woven material. Preferably, the backsheet has a thickness of about 0.012 mm (0.5 mil) to about 0.051 mm.
(2.0 mil) thermoplastic film.

The backsheet 32 is positioned adjacent the absorbent core garment surface and is preferably joined by attachment means as is well known in the art. For example, the backsheet is secured to the absorbent core by a uniform continuous adhesive layer, a patterned adhesive layer, or an array of lines, spirals, or dots of adhesive. Adhesives that have been found to be good are those manufactured by Century Adhesigs, Inc. of Columbus, Ohio, marketed as Century 5227, and H.264, St. Paul, Minnesota. B. Fuller, HL-
It is commercially available as 1258. The means of attachment are Minetola and Tucker.
U.S. Pat. No. 4,573,986 issued Mar. 4, 1986
Preferably, it is an open pattern network of filaments of adhesive as disclosed in No. "Disposable waste containing clothing" (described herein by reference). An example of attachment means for an open filament network of filaments is 1975 by Sprague, Jr.
U.S. Pat. No. 3,911,173, Oct. 7, 1983, Ziecker et al. U.S. Pat. No. 4,785,996, Nov. 22, 1978, and Wereniz.
cz) US Pat. No. 4,842, June 27, 1989.
There are several adhesive filaments spirally spiraled as illustrated in the apparatus and method shown in No. 666.

These patents are incorporated herein by reference. Alternatively, the attachment means may be a thermal bond, a pressure bond, an ultrasonic bond, a dynamic mechanical bond, or any other suitable attachment means known in the art or combinations of these attachment means.

The topsheet 33 has a supple and soft feel and does not irritate the skin of the wearer. Further, the top sheet 33 is liquid-permeable, so that a liquid (for example, urine) can easily penetrate through its thickness. A suitable topsheet is
Porous foams, reticulated foams, perforated plastic films, or woven or non-woven webs of natural fibers (eg wood or cotton fibers), synthetic fibers (eg polyester or polypropylene fibers), or combinations of natural and synthetic fibers. Made from a wide range of materials such as plywood. Preferably, the topsheet is made of a hydrophilic or surfactant treated hydrophobic material.

The topsheet 33 is disposed adjacent the body surface of the absorbent core and is preferably attached by means of attachment (not shown) as is well known in the art to the absorbent core and backsheet 3.
It is joined to 2. Suitable attachment means are described for joining the backsheet to the absorbent core. As used herein, the term "joining" refers to a configuration in which one member is secured by directly securing it to another member and to one or more intermediate members secured to the other member. It also includes a configuration of indirectly fixing by fixing. In a preferred embodiment of the present invention, the topsheet and the backsheet are directly joined to each other on the outer periphery of the diaper and indirectly by joining them directly by the attachment means.

Next, the elasticizing member 10 is attached to the front waist portion 40 and the rear waist portion 41 so that the non-mechanically stretched outer edge portion 51 becomes the distal end at each side end 35a, 35b of the chassis. The inner mounting end 17 of the elasticizing member 10 is preferably mounted between the topsheet 33 and the backsheet 32 of the absorbent chassis 30 by an adhesive 18 applied to one surface, preferably both surfaces, of the mounting end 17. Alternatively, the inner mounting end 17 of the elasticizing member may be placed between the backsheet of the chassis and the structure or layer of other material, for example, between the backsheet and the inner elasticizing barrier leg cuff 55, as shown in FIG. It can also be attached to. Generally, a mounting end 17 inserted and mounted between the topsheet and backsheet.
Width is about 5 to 20 mm, more preferably about 10 to 15 mm
Is. The adhesive may be applied continuously or intermittently, in a straight line or in a curved line, or in a swirl pattern, or any other effective means.

Finally, the absorbent chassis 30 to which the elasticizing member 10 is attached is mechanically bent in the vicinity of the longitudinal center 42 so that the body side surface 34 of the front waist portion 40 approaches the body side surface of the rear waist portion 41. Then, the surface of the outer edge portion 51 of the opposing elasticizing member 10 attached to the front and rear waist portions facing the body side is joined with a seal 52 to form the elasticizing side panel 5,
The pants-type diaper is completed. The seal 52 can be parallel to the longitudinal sides 35 of the absorbent chassis or can be slightly angled as shown in FIG. The seal 52 is preferably as thin as possible to minimize the width of the formed side seam 50. A preferred seal is a pressure bond seal joining the elastic layers 13 at each outer edge 51 of the laminate. In the preferred method, the seal 52 is made by passing the outer edge between a rotating anvil roll and a rotating press roll that applies a typical pressure of about 1500 to 5,000 Kg / cm ² onto the lamina, and generally 1 to Form a line of the seal 52 having a width of 10 mm, preferably 2-5 mm. Junction types can be continuous or interrupted, straight, curved, or irregular.

Preferably, temperatures below 80 ° C. are used. Most preferably, the anvil and pressure roll are operated at ambient temperature. Higher temperatures may also be used as long as they are well below the thermoplastic melting temperature of the material of the elastic layer, and as long as the elastic layer itself is not damaged or weakened at such temperatures. In this way, the pressure, temperature, mode of joining and duration of application of the sealing means are selected to optimize the joining of the polymeric material of the laminate or its respective elasticizing layers without degrading its constituents. To do. The side seams 50 are also made by other known sealing means such as gluing / bonding with other glues, including UV sealing, heat sealing, and combinations thereof.

After the side seams 50 are made, excess material on the outside of the seal is trimmed along line 53 on the outside of the seal 52. In addition, a portion of the seal panel is trimmed, especially around the leg open ends, to provide improved wear and better comfort. The elasticizing members 10 are trimmed both immediately before and after being sewn together, while the front and rear elasticizing members are trimmed separately before or after attachment to the absorbent chassis.

Optionally, the pant diaper of the present invention may include other features and structures commonly used in diapers and training pants. Optional features such as, but not limited to, disposable tapes, elasticized lumbar and abdominal panels in the posterior and anterior-posterior regions of the absorbent chassis, typically,
Elasticized outer leg cuffs and elasticized inner barrier leg cuffs, moisture indicator, absorbent that sits along the sides of the absorbent chassis and partially encloses and seals around the leg openings of pant diapers An elasticizing member may be included at the crotch portion of the chassis that should provide better comfort, a better fit and the inclusion of body exudates.

[0037]

As described in detail above, according to the underpants-type diaper of the present invention, it is possible to appropriately add the leakage preventing structure around the legs, so that it corresponds to the side flap of the absorbent chassis having a substantially rectangular shape. Even if the portion is narrow, it is possible to maintain the degree of freedom in designing the elastic side panel and improve an appropriate leak preventing function around the leg.

[Brief description of drawings]

FIG. 1 is a schematic view of training pants according to the present invention.

FIG. 2 is an explanatory view showing an apparatus for preventing the shrinkage of the web used in the present invention.

3 is an explanatory view showing a state where an upper corrugated roll and a lower corrugated roll are engaged with each other in the apparatus shown in FIG.

FIG. 4 is an explanatory view showing a state in which the web is cut to form two elasticizing members.

FIG. 5 is an explanatory view showing a state in which the seal is attached to the elasticizing member at an angle.

FIG. 6 is an explanatory view showing a state in which the elasticizing member is attached between the back sheet and the cuff.

FIG. 7 is a cross-sectional view showing a leg leakage prevention structure.

[Explanation of symbols]

 1 Training pants 5 Side panel 10 Elasticizing member 30 Absorbent chassis 31 Absorbent core 32 Backsheet 33 Topsheet 60 Upper corrugated roll 61 Lower corrugated roll 80 Leg leakage prevention band

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroaki Shikata 6-6-6, Koyochu, Higashinada-ku, Kobe-shi, Hyogo 613 Building Room 1321

Claims (1)

[Claims] 1. A liquid-permeable topsheet disposed on the body side, a liquid-impermeable backsheet, and an absorbent material disposed between the topsheet and the backsheet for absorbing liquid discharge from a human body. A front waist region and a rear waist region which are substantially rectangular and form a front and rear waist region, and a crotch region which is located between the front waist region and the rear waist region and which forms a crotch portion. An absorptive chassis having, and extending outward in the short side direction of the absorptive chassis from both sides in the longitudinal direction of the front waist region and the rear waist region of the absorbent chassis, the front waist region and the Elastic side panels that are stretchable in at least the short side direction and that form a pant shape by connecting the respective side portions of the rear waist region, and both side portions in the longitudinal direction of the absorbent chassis. An additional elastic band exhibiting elasticity in at least the longitudinal direction, which is provided over at least the entire crotch region and is provided with a leg leakage prevention band that opens outward in the short side of the absorbent chassis. A pants-type diaper with an improved leg leakage prevention structure.