RU2636916C2 - Disposable diaper - Google Patents

Abstract

FIELD: satisfaction of human life necessities.

SUBSTANCE: disposable diaper (1) comprises an absorbent node (2) having a fluid-holding absorbent link (23), a side panel (3) attached to both portions (2S) of lateral sides of one longitudinal end section of the absorbent node (2) to extend in the X direction, as well as a mounting tape (4) attached to the distal lateral section (3S) of each side panel (3) to extend in the X direction. The mounting tape (4) is attached to one side of the side panel (3) on the coupled section (6). The coupled section (6) includes the first coupled section (6S) formed by adhesive bonding, and the second low-coupled section (6W) attached laterally from the outside of the first coupled section (6S). The second low-coupled section (6W) has a lower bond strength than the first coupled section (6S).

EFFECT: improved absorbency.

42 cl, 14 dwg

Description

FIELD OF TECHNOLOGY

The present invention relates to an open type disposable diaper.

BACKGROUND

Disposable diapers are known having side panels extending from both edges of the sides of their main absorbent body (absorbent assembly). The applicant previously proposed a disposable diaper with side panels (stretchable side panels), in which each side panel contains a sheet of the panel, as well as elastic links, while its outer edge portion does not have elasticity due to the fact that the elastic links and the sheet of the panel remain unconnected along the longitudinal direction of the absorbent assembly (see Patent Literature 1 below). According to Patent Literature 1, since the elastic links are not attached to the panel sheet in a non-elastic portion, the outer edge portion of each stretched side panel has increased flexibility, while the elastic links are attached more stably.

The applicant also proposed a disposable diaper with side panels (stretchable side panels), in which each fastening tape contains a hook sheet and a base sheet, and also has a first fixed section, where the hook sheet and the base are attached to each other, as well as a second fixed the area where the fastening tape and the stretch waist panel are attached to each other. The first fixed section and the second fixed section are spaced from each other. The lower edge of the second fixed portion in the longitudinal direction of the absorbent assembly is located above the lower edge of the first fixed portion in the longitudinal direction of the absorbent assembly and is located away from the lower edge of the base sheet in the longitudinal direction of the absorbent assembly (see Patent Literature 2). According to the disclosure in Patent Literature 2, the hook sheet is less likely to separate from the base sheet constituting the fastening tape, which improves usability.

BIBLIOGRAPHY

Patent Literature

Patent Literature 1: JP 2012-135446A

Patent Literature 2: JP 2012-120663A

SUMMARY OF THE INVENTION

In the diaper according to Patent Literature 1, the base of the tape constituting the fastening tape is attached to a sheet of a stretchable side panel in an adhered region having uniform adhesion strength. With such uniform adhesion between the base and the side panel, if you pull the fastener tape with your hand with excessive force applied to the bonded area when fitting the diaper to the user's body, the substrate may break, which will complicate holding the diaper in place of wearing. The destruction of the substrate usually occurs at the distal edge portion of the bonded region, especially at the upper and lower ends of the distal edge portion of the bonded region. The diaper according to Patent Literature 1 thus leaves room for improvement in terms of ease of use. In the case of the diaper according to Patent Literature 2, since the fastening tape is attached to the stretch waist panel in its second fixed portion with uniform adhesion strength, the destruction of the substrate can occur in the same way as in the case of the diaper according to Patent Literature 1, which leaves room for improvement in terms of ease of use.

Thus, the present invention provides a disposable diaper in which there is less likelihood of the substrate breaking between the fastening tape and the side panel, which means that the convenience of use can be improved.

In the diaper according to Patent Literature 1, the base of the tape constituting the fastening tape is attached to the sheet of the stretch waist panel in an adhered region with a predetermined width inward from the distal side edge of the panel sheet. Since the distal edge of the adhered area thus coincides with the distal edge of the panel sheet, the peripheral portion of the stretch waist panel can rotate and fold in the direction of its skin-side side by pulling the fastening tape by hand to tension the stretch waist panel when fitting the diaper to the wearer's body. When the fastening portion of the fastening tape located on the back side of the user is fixed to the landing sheet located in front of the user, and the peripheral portion of the stretch waist panel is folded in the direction away from the skin side, inconvenience may occur, such as the possibility of engaging garments in the fold when putting on a diaper. Thus, there is room for improvement in terms of usability. In the case of the diaper according to Patent Literature 2, the distal edge of the second fixed portion, where the fastening tape is attached to the stretch waist panel, also coincides with the distal edge of the stretch waist panel. Thus, the peripheral portion of the stretch waist panel can be folded in the direction facing away from the skin, so that the diaper according to patent literature 2 leaves room for improvement in terms of ease of use, like the diaper according to patent literature 1.

Thus, the invention provides a disposable diaper that makes it possible to rotate the peripheral portion of each stretch waist panel to the side facing the skin, thereby enhancing usability.

THE SOLUTION OF THE PROBLEM

The invention provides a disposable diaper including an elongated absorbent assembly having a liquid-retaining absorbent unit, a top sheet located on the skin side of the absorbent unit, and a back sheet located on the skin side of the absorbent unit. The absorbent assembly is divided into a front portion that can be worn from the side of the user's abdomen, a rear portion that is worn from the side of the user's back, and a crotch section located between the front portion and the rear portion. The diaper has a longitudinal direction coinciding with the longitudinal direction of the absorbent assembly, as well as a lateral direction perpendicular to the longitudinal direction. The diaper further includes a stretchable side panel attached to both portions of the sides of one longitudinal end portion of the absorbent assembly and extending outward in a lateral direction, as well as a fastening tape attached to a distal side portion of each stretchable side panel and extending outward in a lateral direction. The fixing tape is attached to the skin-sided side of the stretchable side panel. The attachment tape is adhered by the first adhered portion, where the attachment tape and the stretchable side panel are adhered to each other by adhesive adhesion using an adhesive. The first interlocked portion is located at some distance laterally inward from the distal lateral edge of the stretched side panel. An unlinked portion or a second loosely coupled portion is formed between the first engaged portion and the distal side edge of the stretch side panel. An unengaged portion is a portion where the fastening tape and the stretchable side panel are not engaged with each other, extending over the entire length of the fastening tape in the longitudinal direction. The second loosely coupled portion is a portion where the fastening tape and the stretchable side panel are bonded to each other with lower adhesion strength than in the first bonded portion, laterally outwardly adjacent to the first bonded portion and continuously extending along the entire length of the fastening tape in the longitudinal direction.

BRIEF DESCRIPTION OF THE DRAWINGS

In FIG. 1 is a plan view of an open type disposable diaper according to a first embodiment of the first aspect of the invention in its elongated state when viewed from the side of the top sheet.

In FIG. 2 is an enlarged top view of the stretch side panel of the disposable diaper shown in FIG. 1, in its elongated state.

In FIG. 3 is a sectional view taken along line I-I of FIG. 1 in a compressed state.

In FIG. 4 shows the stretch side panel of the open type disposable diaper of FIG. 1 in a state of being worn.

In FIG. 5 is a plan view of the stretch side panel of an open type disposable diaper according to a second embodiment of the first aspect of the invention in its elongated state (equivalent to FIG. 2).

In FIG. 6 is a plan view of an open type disposable diaper according to a first embodiment of the second aspect of the invention in its elongated state when viewed from the side of the top sheet.

FIG. 7 is an enlarged top view of the stretch side panel of the disposable diaper shown in FIG. 6.

In FIG. 8 is a sectional view taken along line I-I of FIG. 7.

In FIG. 9 is an enlarged top view of the stretch side panel of the open type disposable diaper of FIG. 6 in the put on condition.

In FIG. 10 is an enlarged plan view of a stretch side panel of an open type disposable diaper according to a second embodiment of the second aspect of the invention (equivalent to FIG. 7).

In FIG. 11 is an enlarged plan view of a stretch side panel of an open type disposable diaper according to a third embodiment of the second aspect of the invention (equivalent to FIG. 7).

In FIG. 12 is an enlarged plan view of a stretch side panel of an open type disposable diaper according to a fourth embodiment of the second aspect of the invention (equivalent to FIG. 7).

In FIG. 13 is an enlarged plan view of a stretch side panel of an open type disposable diaper according to a fifth embodiment of the second aspect of the invention (equivalent to FIG. 7).

In FIG. 14 is an enlarged plan view of a stretch side panel of an open type disposable diaper according to a sixth embodiment of the second aspect of the invention (equivalent to FIG. 7).

DESCRIPTION OF EMBODIMENTS

The disposable diaper according to the first aspect of the invention will be described generally with reference to its preferred first embodiment by means of FIG. 1-4.

As shown in FIG. 1, the disposable diaper of the present embodiment (also referred to as “diaper 1” hereinafter) includes an elongated (elongated in the Y direction) absorbent assembly 2 having a liquid-retaining absorbent member 23, a top sheet 21 located on the side facing the skin the absorbent link 23, as well as the back sheet 22, located on the side of the absorbent link 23 facing away from the skin. The absorbent assembly 2 is divided into a front portion A that can be worn from the side of the user's abdomen, rear the second section B, made with the possibility of wearing from the back of the user, as well as the crotch section C located between the front section A and the rear section B along its longitudinal direction. As shown in FIG. 1, the diaper 1 further includes a side panel 3 attached to both side portions 2S of one longitudinal end portion, namely the rear portion B, the absorbent assembly 2 and extending outward in the lateral direction X. The diaper 1 further includes a fastening tape 4, fixed to the distal side portion 3S of the side panel 3 along the longitudinal direction of the absorbent assembly 2 (Y direction) and extending outward in the lateral direction X.

The diaper 1 is bilaterally symmetrical about the longitudinal center line CL. Thus, the bilaterally symmetrical parts of the diaper 1 will be described as a whole with respect to its right side.

In the context of the present description, the expression “skin side” refers to the side of the link forming the diaper 1 facing the skin of the user when the diaper is worn, which corresponds to the side marked with the letter P (hereinafter “side P”) in FIG. 3. The expression “skin-sided” refers to the side of the link forming the diaper 1 facing opposite to the skin of the wearer when the diaper is worn, which corresponds to the side marked with the letter Q (hereinafter “size Q”) in FIG. 3.

The direction indicated by the letter Y (hereinafter referred to as the Y direction) in the accompanying drawings is the longitudinal direction of the absorbent assembly 2 of the diaper 1 parallel to the center line CL. The direction indicated by the letter X (hereinafter referred to as the X direction) in the accompanying drawings is the lateral direction of the absorbent assembly 2 of the diaper 1, perpendicular to the center line CL. Diaper 1 will be illustrated below in detail.

As shown in FIG. 1, the absorbent assembly 2 is rectangular and longer in the Y direction than in the X direction, while it has a liquid permeable top sheet 21, liquid impermeable or moderately permeable to liquid (including water repellent) back sheet 22, and also holding the liquid absorbent link 23 located between the sheets 21 and 22. The upper sheet 21 and the back sheet 22 cover the entire area respectively of the skin side and the side of the skin side of the absorbent link 23 and continue further in the external direction away from the perimeter of the absorbent link 23. The top sheet 21 and the back sheet 22 are attached to each other using adhesive (for example, hot-melt adhesive) or by fusion bonding (for example, heat sealing) on their extensions outside the perimeter of the absorbent link 23. The top sheet 21 has such the same length as the back sheet 22 in the Y direction, but shorter than the back sheet 22 in the X direction. The back sheet 22 has the same shape in a plan view as the absorbent assembly 2.

The side sheet 24 is located on each side section 2S of the absorbent assembly 2 along the Y-direction by the top sheet 21. The side sheet 24 is attached to the skin side of the top sheet 21 and extends along the entire length (in the Y direction) of each side section 2S. Laterally (in the X direction), the proximal edge of each side sheet 24 (an edge closer to the centerline CL) is a free edge. The side sheet 24 near its free edge on the crotch portion C is equipped with elastic links 25 to form a leak-tight cuff, fixed in its stretched state so as to cause the side sheet 24 to rise from the free edge to a predetermined width from the top sheet 21 to form a leak-proof cuffs while reducing elastic links while wearing a diaper.

Each side sheet 24 extends laterally outward from the side portions 2S of the absorbent assembly 2 and is connected to the back sheet 22 to form a valve. As shown in FIG. 1, each valve in the crotch portion C is equipped with elastic links 26 forming assemblies around the legs in their stretched state in the Y direction, so that the elastic links 26 can contract during wear to form assemblies around the legs.

As shown in FIG. 1 and said above, the rear portion B of the absorbent assembly 2 along each of the side portions 2S is equipped with a side panel 3 extending laterally outward, while the side panel 3 along its distal side portion 3S is provided with a fastening tape 4 extending laterally outward. In the diaper 1, as shown in FIG. 3, the side panel 3 is attached to the skin side of the back sheet 22 located on each side portion 2S by various known means so as to extend laterally outward from the side edge 2S1 of the absorbent assembly 2. When the side panels 3 of the diaper 1 are attached to the facing from the skin to the side of the back sheet 22, the side panels 3 can be fixed between the side sheet 24 and the back sheet 22 or on the skin-facing side of the side sheet 24 in the side portions 2S of the absorbent assembly 2. The side panels 3 in the diaper 1 are Oh stretchable side panels with tensile properties in the X direction.

As shown in FIG. 2 and 3, each stretch side panel 3 of the diaper 1 comprises a skin-facing sheet 31 located on the skin-facing side of the stretch side panel 3, a skin-facing sheet 32 located on the skin-side of the stretch side panel 3, and a plurality of filamentary elastic links (hereinafter referred to as "elastic threads") 33 fixed between them in their stretched state. The distal side portion 3S of the stretchable side panel 3 has a length in the Y direction greater than the length of the fastening tape 4 in the same direction in the engaged region 6, which will be described later. More specifically, as shown in FIG. 2, the stretchable side panel 3 of the diaper 1 is rectangular in its flat configuration, with both the skin-facing sheet 31 and the skin-facing sheet 32 forming the stretchable side panel 3 having the same top view as the stretchable side panel 3 in its flat configuration. Many elastic threads 33 are arranged to extend in the X direction, being generally uniformly spaced and parallel to each other. Although the stretchable side panels 3 of the diaper 1 are rectangular, they can have a trapezoidal shape or a shape having a curved edge if the length in the Y direction of the distal side edge of each stretchable side panel 3 exceeds the length of the fastening tape 4 in the adhered region 6 in the same direction.

Although the side panels 3 of the diaper 1 are extensible as described above, they may not be extensible. Although each of the stretchable side panels 3 of the diaper 1 is formed by two sheets of non-woven fabric (sheet facing the skin 31 and the sheet 32 facing the skin), having a plurality of elastic threads 33 fixed therebetween, the stretch side panel 3 may be a composite sheet formed by two sheets of nonwoven fabric (sheet 31 facing the skin and sheet 32 facing the skin) with an elastomeric film or an elastomeric mesh located and fixed between them. The elastic thread 33 may have a generally round, square or rectangular cross section.

Although the skin-facing sheet 31 and the skin-facing sheet 32 forming the stretchable side panel 3 of the diaper 1 have the same shape and size as shown in FIG. 2 and 3, the elongated segment of the skin-facing sheet 31 extending from the side edge 2S1 of the absorbent assembly 2 may be different from the elongated segment of the skin-facing sheet 32 extending from the side edge 2S1 of the absorbent assembly 2. In case the side panel 3 is formed facing towards skin sheet 31 and skin-facing sheet 32, elongated segments of which from the side edge 2S1 are different from each other, the distal portion of the distal side portion 3S of the stretched side panel 3 should be formed either facing the skin sheet 31, or facing away from the skin of the sheet 32. In this case, the distal side portion 3S stretchable side panels 3 will have increased softness.

The elastic thread 33 located in the stretchable side panel 3 preferably has a width (size in the Y direction) or a diameter of 0.1-2 mm, more preferably 0.1-1 mm, from the point of view of increasing flexibility and ensuring the stretchability of the stretchable side panels 3. The number of elastic threads 33 located in the stretchable side panel 3 is preferably from 1 to about 25, more preferably from 3 to 20. Elongation of the elastic thread 33 is determined according to traditional knowledge. Preferably, the elastic yarns 33 experiencing a stress of 0.1-1 N per thread at 100% elongation are fixed at elongation of 50% -300%, more preferably at elongation of 100% -250%. The expression "elongation" in the context of the present description means the ratio of elongation to natural length. When, for example, a 10 cm elastic thread is extended to 20 cm, the elongation is 100%.

In the case where the stretchable side panel 3 has an elastomeric film or mesh instead of elastic threads 33, it is preferable that the elastomeric mesh experiencing a stress of 3-25 N / 25 mm width at 100% elongation is fixed at elongation of 50% -300%, more preferably 100% -250%. In the case where the stretch side panel 3 has an elastomeric film or mesh instead of elastic threads 33, the elastomeric film or mesh can be attached between the skin-facing sheet 31 and the skin-facing sheet 32 in its unstretched state, so as to initially prepare an inextensible composite sheet. In this case, lateral extensibility will later be given to the skin-facing sheet 31 and the skin-facing sheet 32 by treating the inextensible composite sheet to give extensibility in order to create an extensible side panel 3. The non-extensible composite sheet is lengthened at the processing stage to impart extensibility by an amount which does not lead to the destruction of the elastomeric film or mesh, preferably by the amount of stretching, which is a percentage of 50% -300%.

As shown in FIG. 3, the side panel 3 of the diaper 1 has adhesive layers for attaching a plurality of elastic threads 33 between the skin-facing sheet 31 and the skin-facing sheet 32. The adhesive layers include a proximal adhesive layer 35, where the proximal end of each elastic thread 33 is fixed, the distal adhesive layer 36, where the distal end of each elastic thread 33 is fixed, as well as intermediate adhesive layers 37 located between the proximal adhesive layer 35 and the distal adhesive layer 36, where two sheets 31 and 32 are adhered to each other. A plurality of intermediate adhesive layers 37 are disposed in a region located between the proximal adhesive layer 35 and the distal adhesive layer 36. In the diaper 1, each of the intermediate adhesive layers 37 is smaller in width than the proximal or distal adhesive layers 35 and spaced in the X direction in the intermediate region 30. All proximal adhesive layers 35, distal adhesive layers 36, and intermediate adhesive layers 37 extend along the entire length of the stretch side panel 3 in the Y direction across each elastic thread 33, to As shown in FIG. 2. Thus, the plurality of elastic yarns 33 are fixed in their stretched state between the skin facing sheet 31 and the skin facing sheet 32 by the proximal adhesive layer 35, the distal adhesive layer 36 and the intermediate adhesive layers 37. The stretch side panel 3 is formed by applying adhesive onto the skin-facing sheet 31 or onto the skin-facing sheet 32, or both of them, by any known method according to the scheme corresponding to the proximal, distal and intermediate adhesive layers 35, 36 and 37, and then soy stretching two sheets 31 and 32 under pressure, when the elastic threads 33 are located between them in their stretched condition.

As shown in FIG. 3, in regions of the stretchable side panel 3, where there are no elastic threads 33, the skin-facing sheet 31 and the skin-facing sheet 32 are directly bonded to each other by the proximal adhesive layer 35, the distal adhesive layer 36, and also the intermediate adhesive layers 37. Thus areas 38 are created that are not adherently bonded, where the skin-facing sheet 31 and the skin-facing sheet 32 are not bonded to each other between the proximal adhesive layer 35 and the adjacent intermediate adhesive layer 37, between adjacent intermediate GOVERNMENTAL adhesive layers 37, and also between the distal adhesive layer 36 and the adjacent intermediate adhesive layer 37. As shown in FIG. 2, all areas 38 that are not adherently bonded extend along the entire length of the side panel 3 in the Y direction across each elastic thread 33, similarly to the adhesive layers 36, 36, and 37.

The side panel 3 of the diaper 1 having the above-described structure forms a plurality of folds on both sides thereof, as shown in FIG. 3, when the elastic yarns 33, fixed in their stretched state by means of the proximal, distal and intermediate adhesive layers 35, 36 and 37, are in a relaxed unstretched state. Each crease extends in the Y direction across the plurality of elastic strands 33. The creases formed on the side panel 3 are formed so that two sheets 31 and 32 are bulged apart from the elastic strands 33 in each non-adhesive region 38 due to the reduction of the elastic strands 33 while remaining adhered to the elastic threads 33 in each intermediate adhesive layer 37, so that ridges and depressions are formed between the proximal adhesive layer 35 and the distal adhesive layer 36, as shown in FIG. 3. Such folds do not completely disappear even when wearing a diaper.

As shown in FIG. 2 and 3, each elastic thread 33 of the stretchable side panel 3 has a proximal fixed end portion 33I (closer to the centerline CL), which is attached using the proximal adhesive layer 35, as well as a distal fixed end section 33O, which is attached using a distal adhesive layer 36.

In the relaxed state of the stretch side panel 3 shown in FIG. 2, the width (dimension in the X direction) of the distal fixed end portion 33O is preferably 3% -20%, more preferably 5% -15%, of the total length of the elastic strand 33. The width of the proximal fixed end portion 33I is the same. Fastening when creating a stretchable side panel 3 can be accomplished by combining adhesive adhesion using adhesive layers 35, 36, and 37 and fusion bonding, such as heat sealing. In the context of the present description, the expression "adhesive adhesion" means adhesion using adhesive.

As shown in FIG. 2 and 3, the skin-facing sheet 31 of the stretchable side panel 3 of the diaper 1 has an extension 31S extending laterally outward from the distal fixed end portion 33O of the plurality of elastic threads 33, while the skin-facing sheet 32 likewise has an extension 32S extending laterally outward from the distal fixed end portion 33O of the plurality of elastic strands 33. The extensions 31S and 32S are linked to each other on a plurality of sealed bundles 61 (described below) formed by indentation, heat sealing, or ultrasound oh welding. The extensions 31S and 32S can be adhered to each other by applying an adhesive (adhesive adhesion) instead of forming tight ligaments 61 (tight adhesion). In order to prevent the distal side portion 3S from being pulled outward during stretching of the side panel 3 during use, a combination of sealed clutch and adhesive clutch may be used.

The fastening tape 4 is adhered to one side of the side panel 3 in the adhered area 6. In the case of the diaper 1, the fastening tape 4 is attached only to the skin-side (side Q) of the stretch side panel 3, as shown in FIG. 3. Namely, as shown in FIG. 3, the proximal (closer to the centerline CL) end portion of the fastening tape 4 is attached to the skin-side (Q side) of only the extension 32S of the skin-facing sheet 32 forming a stretch side panel 3 that is laterally outside the distal fixed end portion 33O elastic thread 33. As can be seen from FIG. 2, the fastening tape 4 is attached to the side panel so that the fastening tape 4 is unevenly distributed at the end portion of the stretched side panel 3 closer to the longitudinal end of the rear portion B. Although in the diaper 1, the fastening tape 4 is attached only to the side of the side panel 3 facing away from the skin, it can only be attached to the side of the side panel 3 facing the skin.

A fastening tape 4 provided on the distal side portion 3S of the stretch side panel 3 will be described in detail. The fastening tape 4 includes a base sheet 41 and a hook material 42 having a plurality of engaging protrusions in a distal portion of the base sheet 41. The fastening tape 4 is folded back before use and is folded in use as shown in FIG. 3. As shown in FIG. 2, the fastening tape 4 of the diaper 1 is rectangular and longer in the X direction than in the Y direction in its unfolded state. The fastening tape 4 is formed by creating a base sheet 41 having the same shape in a plan view as the fastening tape 4, and attaching the hook material 42 to the distal portion of the base sheet 41. The diaper 1 has a landing sheet on the outside of the front portion A. 5, on which the hook material 42 of the fixing tape 4 is fixed.

As shown in FIG. 2, the adhered area 6, where the fastening tape 4 and the side panel 3 are adhered to each other, includes a first adhered portion 6S formed by adhesive engagement, and a second loosely adhered portion 6W located laterally outside adjacent to the first adhered portion 6S and having a smaller adhesion strength than the first bonded portion 6S. An adhered region 6 is formed over the entire area of the overlap region where the fastening tape 4 and the side panel 3 overlap. The coupled area 6 includes a first coupled portion 6S and a second loosely coupled portion 6W adjacent to each other. The first bonded portion 6S and the second weakly bonded portion 6W extend between the upper and lower ends of the overlap region, where the fastening tape 4 and the side panel 3 overlap. A second weakly engaged portion 6W adjacent to the first engaged portion 6S is formed between the first engaged portion 6S and the distal side edge 3S1 of the stretched side panel 3. The first engaged portion 6S has such high adhesion strength that the bond between the fastening tape 4 and the side panel 3 can undergo failure at the level of the substrate when, for example, the fastening tape 4 is pulled in the X direction. The second weakly bonded portion 6W has lower adhesive strength than the first bonded portion 6S, so that the fastening tape 4 and the side panel 3 may be separated before the destruction of the substrate will occur when, for example, the fixing tape 4 is pulled in the direction X. The bond strength is not limited in absolute terms, if the above condition is satisfied. Such high adhesion strength, capable of causing destruction of the first adhered portion 6S at the substrate level, varies depending on the strength of the substrate. If the side panel-side substrate adhered to the fastening tape 4 is a nonwoven melt material, the adhesion strength of the first adhered portion 6S will be about 15-40 N / mm when converted to tensile strength immediately before the material breaks.

The adhesion strength of the second weakly coupled portion 6W, being unlimited in absolute terms, is preferably 5% -70%, more preferably 20% -50%, of the adhesion strength of the first adhered portion 6S.

A method for measuring the adhesion strength of the first adhered portion 6S and the second weakly adhered portion 6W is described below. In a first aspect of the invention, the adhesion can be measured differently, provided that the above described adhesion ratio is satisfied.

Method for measuring adhesion strength

As a sample, a side panel 3 was created having a fastening tape adhered thereto by means of a first adhered portion 6S and a second weakly adhered portion 6W. The side panel 3 and the mounting tape 4 were torn apart using an Orientec Co., Ltd. tensile testing apparatus RTC-1150. at a speed of 300 mm / min. The second weakly coupled portion 6W was separated first, while the tensile strength was taken as the adhesion strength of the second weakly coupled portion 6W. The stretching was continued, while the tensile strength immediately before the destruction of the material either in the side panel 3 or in the mounting tape 4 was taken as the adhesion strength of the first portion 6S.

In the first bonded portion 6S, the side panel 3 and the fastening tape 4 are bonded with adhesive applied between them, as well as on a plurality of sealed bundles 61 formed by indentation, heat sealing or ultrasonic welding, as shown in FIG. 2. In the second weakly coupled portion 6W, adhesion is achieved only on a plurality of sealed bundles 61 formed by indentation, heat welding or ultrasonic welding, as shown in FIG. 2. Thus, since in the diaper 1, the first adhered portion 6S is formed by adhesive adhesion and sealed adhesion, while the second weakly adhered portion 6W is formed only by the sealed adherence, the second weakly adhered portion 6W has lower adhesion strength than the first adhered portion 6S . Although in the diaper 1, the first adhered portion 6S (having a higher adhesion strength) is formed by a combination of adhesive adhesion and sealed adherence, and the second weakly adhered portion 6W (with lower adherence strength) is formed only by a sealed adherence, it is possible to form a first adhered portion 6S and a second weakly adhered portion 6W only by adhesive adhesion or only by sealed adhesion, provided that the second weakly engaged portion 6W has lower adhesion strength than the first engaged chastok 6S.

The formation of the first adhered portion 6S and the second weakly adhered portion 6W only by adhesive adhesion can be achieved, for example, by increasing the density of the adhesive in the first adhered portion 6S compared to this value in the second weakly adhered portion 6W. For example, the density of the adhesive in the first bonded portion 6S may be 10-50 g / m ² , while the density of the adhesive in the second weakly bonded portion 6W may be 50% or less, preferably 20% or less, of the density of the adhesive in the first bonded portion 6S. For the same purpose, the first bonded portion 6S can be formed by uniformly applying adhesive, while the second weakly bonded portion 6W can be formed by applying the adhesive with straight stripes parallel to the lateral direction. According to the third method, the second weakly bonded portion 6W can be formed using conventional hot-melt adhesive, such as styrene-butadiene-styrene (SBS) block copolymer, styrene-isoprene-styrene (SIS) block copolymer, low density polyethylene resin or ethylene vinyl acetate resin, wherein the first bonded portion 6S can be formed using a highly adhesive copolyamide hot melt resin.

The formation of the first bonded portion 6S and the second loosely bonded portion 6W only by adhesive bonding can be accomplished by changing the application pattern or the amount of adhesive applied between the two bonded areas. For example, the first adhered portion 6S is formed by uniform deposition, while the second weakly adhered portion 6W is formed by intermittent application.

If the first adhered portion 6S and the second weakly adhered portion 6W are formed only by sealed adhesion (for example, heat welding or ultrasonic welding), this can be achieved, for example, by forming the first adhered portion 6S by welding at a melting point or higher than the melting temperature of the fiber, which is facing skin sheet 31 or sheet 32 facing away from the skin, either at a melting point or higher than the melting temperature of the fiber constituting the base sheet 41 of the tape, and at the same time the formation of a second weak of the bonded portion 6W by welding at a temperature of 0% -20% below the melting temperature of the fiber constituting the skin sheet 31 or facing the skin of the sheet 32, or a temperature of 0% -20% below the melting temperature of the fiber constituting the base sheet 41 tapes.

The densified ligaments of the first bonded portion 6S and the second loosely coupled portion 6W may be indented pressed bundles. For example, a stack of forming sheet materials is passed under an extrusion roll previously heated to a melting point or lower than the melting temperature of the fiber constituting the skin-facing sheet 31 or skin-facing sheet 32, or below the melting temperature of the fiber constituting the base sheet 41 of the tape, the formation of compressed ligaments in the areas corresponding to the first interlocked portion 6S and the second weakly interlocked portion 6W.

As shown in FIG. 2, the adherent region 6, including the first adhered portion 6S and the second weakly adhered portion 6W, has a plurality of densified bundle groups 61G, each of which consists of small densified bundles 61 uniformly spaced in the Y direction, with the plurality of densified bundle groups 61G in the X direction so that the sealed ligaments 61 of one group 61G of sealed ligaments and the sealed ligaments 61 of an adjacent group 61G of sealed ligaments are not aligned with each other in the X direction. More specifically, the sealed ligaments 61 I, as shown in FIG. 2, the first elongated densified ligaments 611, inclined at an angle to the Y direction, as well as the second elongated densified ligaments 612, inclined so as to face opposite to the first elongated densified ligaments 611. In the context of the present description, the expression “be opposite” means that, if you draw an imaginary line IL1 (see Fig. 2) parallel to the centerline CL, and place the imaginary densified ligaments symmetrically to the first densified ligaments 611 relative to the line IL1, the angle of the imaginary densified the ligaments with respect to the Y direction coincides with the angle of the second densified ligaments 612 with respect to the Y direction. As shown in FIG. 2, the densified ligament groups 61G in the diaper 1 include the first densified ligament groups 611G, each of which consists of the first densified ligaments 611 uniformly spaced in the Y direction, and the second densified ligament groups 612G, each of which consists of the second densified ligaments 612 uniformly spaced in the Y direction. As shown in FIG. 2, the adhered region 6 of the diaper 1 has only two first densified bundle groups 611G and only two second densified bundle groups 612G arranged alternately in the X direction, so that the first bonded portion 6S and the second loosely bonded portion 6W contain one first compacted bundle group 611G and one a second group of 612G compacted ligaments. The first sealed bundles 611 forming one first group of sealed bundles 611G and the second sealed bundles 612 forming an adjacent second sealed bundle group 612G are not aligned with each other in the X direction and offset in the Y direction.

As shown in FIG. 2, the second loosely coupled portion 6W of the diaper 1 includes a plurality of sealed ligaments 61 (including the first sealed ligaments 611 and the second sealed ligaments 612), as well as a non-densely engaged region 62 located between adjacent sealed ligaments 61 (including the first sealed ligaments 611 and second densified ligaments 612). Namely, in the diaper 1, since the second loosely coupled portion 6W is formed by an exclusively sealed clutch, the area between adjacent sealed bundles 61 (i.e., the first fused bundles 611 and the second fused bundles 612) of the second loosely coupled portion 6W is an unlinked region 62, where the tape 4 and the side panel 3 are not engaged with each other. The presence of such an unlinked region 62 gives increased flexibility to the second weakly coupled portion 6W.

As indicated, in the first adhered portion 6S of the diaper 1, the stretchable side panel 3 and the fastening tape 4 are engaged not only on the plurality of sealed ligaments 61, but also in the adhesive adhered area 63 formed by the adhesive, as shown in FIG. 2. Adhesively adhered region 63 continuously extends along the entire length of the fastening tape 4 in the Y direction, as well as along a width including the width of two groups 61G of sealed ligaments (one first group 611G of sealed ligaments and one second group 612G of sealed ligaments) in the X direction. B while the width of the adhesive-bonded region 63 of the diaper 1 includes the width of the two sealed bundle groups 61G, it may be equal to the width of the two sealed bundle groups 61G. Since the areas between adjacent sealed bundles 61 (including the first sealed bundles 611 and the second sealed bundles 612) are adhesive in the first bonded portion 6S, the first bonded portion 6S does not have an unbonded region 62 in which the fastening tape 4 and the side panel 3 are not engaged with each other friend. Since in the first bonded portion 6S, the fastening tape 4 and the stretchable side panel 3 are attached to each other by both fusion bonding and adhesive bonding, the first bonded portion 6S has a higher adhesive strength than the second weakly bonded portion 6W.

In the diaper 1, some of the plurality of sealed ligaments 61 span the distal edge 3S1 of the stretchable side panel 3 on both sides and extend laterally outward from the distal edge 3S1 of the stretchable side panel 3. In particular, while the second weakly engaged portion 6W has a first group 611G of sealed ligaments and a second group of sealed bundles 612G, each of a plurality of second sealed bundles 612 belonging to the second group of sealed bundles 612G, covers on both sides the distal edge 3S1 of the side panel 3 and continues I am laterally outward from the second weakly coupled portion of 6W. In short, each of the plurality of second densified ligaments 612 belonging to the second fused ligament group 612G located in the second loosely coupled portion 6W is in a bridged position on both sides of the distal edge 3S1 of the side panel 3. Due to the presence of some sealed bunches 61 in a bridged position with two sides of the distal edge 3S1, it is not allowed to lift the side panel 3 from the mounting tape 4 along its distal edge 3S1, i.e. the boundary between the side panel 3 and the mounting tape 4.

The length in the Y direction of the stretch side panel 3 having an overlap region (i.e., an adhered area 6) where the stretch side panel 3 and the fastener tape 4 overlap exceeds the length in the Y direction of the fastener tape 4 in the overlap region (i.e., engage area 6). In the context of the present description, the expression “length in the Y direction” means the maximum length of the stretchable side panel 3 or the fastener tape 4 within the width in the X direction of the overlap region (i.e., the bonded region 6) where the stretchable side panel 3 and the fastener tape 4 overlap . The length in the Y direction of the stretch side panel 3 having an overlap region (i.e., the grip area 6) is preferably 1.2-3.5 times, more preferably 1.4-3.0 times, longer than the length in the Y direction the fastening tape 4 in the overlap area (i.e., the grip area 6) to facilitate fitting the diaper to the user without causing user inconvenience, and to exert force to rotate the stretch side panel 3 inward towards the user's skin.

The area in the plan view of the overlapping region (i.e., the bonded region 6) is preferably from 10% to 50%, more preferably 10% -40%, of the total area of the stretched side panel 3 in its natural relaxed state, bearing in mind the adhesive strength .

The area of the first adhered portion 6S is preferably equal to or greater than the area of the second weakly adhered portion 6W.

The area of the first adhered portion 6S is preferably 40% -80%, more preferably 50% -70%, of the area of the overlap area (i.e., adhered area 6) from the point of view of increasing the adhesion strength without causing any inconvenience to the user.

From the same point of view, the area of the second weakly coupled portion 6W is preferably 20% -60%, more preferably 30% -50%, of the area of the overlap area (i.e., the adhered area 6).

The shape of the fused ligaments 61, which are compacted ligaments (including the first fused ligaments 611 and the second fused ligaments 612), is not particularly limited and may be round, rhombic, triangular, polygonal or otherwise, as well as an elongated annular, as in diaper 1. Area ligaments 61 individual densified (compacted bundles of individual first 611 or second multiplexed individual ligaments 612) is preferably 2-30 mm ^2, more preferably 2-20 mm ^2, from the viewpoint of improving adhesion without causing wherein n the convenience of users. The distance between two first fused bundles 611 or two second sealed bundles 612 adjacent in the Y direction is preferably 1-8 mm, more preferably 6 mm or less, from the same point of view. The distance between the closest densified bundles 61 (i.e., between the first densified bundle 611 and the nearest second densified bundle 612) is preferably 1-8 mm, more preferably 6 mm or less, from the same point of view. The number of compacted bundles 61 (including the first compacted bundles 611 and second compacted bundles 612) per unit area is preferably from 1 to 16 per cm ² , more preferably from 2 to 10 per cm ² , from the same point of view. The ratio of the total area of the densified ligaments 61 (including the first densified ligaments 611 and the second densified ligaments 612) to the area of the overlap area (i.e., the adherent region 6) is preferably 10% -70%, more preferably 10% -50%, with the same point of view itself.

As shown in FIG. 2, the diaper 1 has a fastening tape 4 attached to the side panel 3 in a place in the Y direction, which is closer to the upper edge of the stretch side panel 3 (the edge closer to the longitudinal end of the rear portion B) than to the opposite lower edge of the stretch side panels 3. Thus, when the fastening tape 4 is stretched when fitting the diaper to the body of the user, the angle of inclination of the sealed ligament 61 located in the laterally outermost and longitudinally lowest (closest to the crotch section C) floor However, it substantially coincides with the angle of inclination of the second imaginary line IL2 connecting the intersection point PD1 located closer to the crotch section C between the distal edge of the side panel 3 and the lower edge of the fastening tape 4, and the intersection point PD2 located closer to the crotch section C between the side the edge 2S1 of the absorbent assembly 2 and the lower edge of the side panel 3. In other words, when the fastening tape 4 is stretched when fitting the diaper 1, the angle of inclination of the second fused bundle 612, which is the lowest (closest to the communities are high portion C) of compacted bundles 612 belonging to the second group 612G compacted bundles formed on the second portion slabostseplennom 6W linked region 6 (hereinafter called second fused bundle 612C), substantially coincides with the inclination angle of the second imaginary line IL2. In the diaper 1, all second densified bundles 612 belonging to the second densified bundles groups 612G formed in the first bonded portion 6S and the second loosely bonded portion 6W of the bonded region 6 have the same angle of inclination as the second compacted bundle 612C. The second fused ligament 612C, taken as the lowest or closest to the crotch section C, is a compacted ligament, more than half of the area of which is located on the second weakly linked section 6W.

As shown in FIG. 3, in the diaper 1, the adhesion region 6 overlaps a portion of the distal fixed end portion 33O of the elastic links 33 of the stretch side panel 3. In more detail, the first adhesion region 6S of the adhesion region 6 overlaps a portion of the distal fixed end portion 33O of the elastic link 33, i.e. the portion of the distal adhesive layer 36 forming the distal fixed end portion 33O of the elastic link 33. The overlap area between the first adhered portion 6S and the distal adhesive layer 36 is preferably 5% -50%, more preferably 15% -30%, of the area of the distal adhesive layer 36 .

When fitting the diaper 1 to the body of the user, the folded fastening tapes 4 are folded out and stretched by hand to stretch the side panels 3, while the hook material 42 of the fastening tapes 4 is fixed on the landing sheet 5.

Next, materials forming the diaper 1 will be described.

The top sheet 21, the back sheet 22 and the absorbent element 23 constituting the absorbent assembly 2 can be made of any materials traditionally used in sorbent articles, including disposable diapers and sanitary napkins. For example, the topsheet 21 may be a hydrophilic, liquid permeable nonwoven web or a three-dimensional perforated film. The backsheet 22 may be a liquid impermeable or moderately permeable film or a non-woven fabric (e.g., non-woven fabric from the melt / obtained from the melt aerodynamically / from the melt, using airtight bonding, melt bonding, using water-jet bonding or needle-piercing) . The composite sheet formed by these materials can also be used as the back sheet 22. The absorbent unit 23 may consist of an absorbent core formed by a plurality of fibers (eg, cellulose fibers) or a non-woven fabric, which may contain absorbent polymer particles, as well as a layer wrapping a core formed of a permeable fabric or non-woven fabric wrapping an absorbent core. The side sheet 24 forming a leakproof cuff may be a film, a nonwoven fabric, a woven fabric, or a laminate of these sheet materials.

The skin-facing sheet 31 and the skin-facing sheet 32 of the stretch side panel 3 can be made of any materials commonly used in sorbent articles, such as disposable diapers and sanitary napkins. For example, the skin-facing sheet 31 and the skin-facing sheet 32 may be formed from a nonwoven fabric, a woven fabric, a film, or a layered structure from these sheet materials.

The elastic threads 33 forming the stretch side panel 3, the elastic link 25 forming the leakproof cuff, and the leg elastic link 26 may be an elastic thread or thread of natural rubber, polyurethane, isoprene-styrene copolymer, butadiene-styrene copolymer or ethylene-α-olefin copolymer (for example, a copolymer of ethyl acrylate and ethylene). Preferably, the elastic yarns 33 used in the side panel 3 are of the same type and have the same elongation in terms of production costs and simplicity of production technology.

Preferred materials for adhesives used to form the proximal adhesive layer 35, the distal adhesive layer 36 and the intermediate adhesive layers 37 of the stretch side panel 3, as well as adhesives used to adhere the various units, include thermoplastic polymers such as amorphous polyolefins, ethylene vinyl acetate copolymers ( EVA), ethylene-acryl ether copolymers (EEA), styrene-butadiene-styrene block copolymers (SBS), styrene-isoprene-styrene block copolymers (SIS), styrene-ethylene / butylene- block copolymers Tyrol (SEBS), and block copolymers of styrene-ethylene / propylene-styrene (SEPS), or mixtures thereof. Hot melt adhesives are preferred.

The adhesive forming each adhesive layer 35, 36 or 37 is preferably applied in a uniform continuous layer using an applicator, such as a spray gun or a coating gun. The adhesive can also be applied in a pattern, for example, in the form of lines, in the form of a spiral, in the form of an omega letter or spot, using a droplet spray gun, a spiral spray gun, a spray gun in the form of an omega letter, an intermediate roller or a similar applicator .

If the side panel 3 is an inextensible side panel, it can be formed from any sheet material traditionally used in sorbent products, including disposable diapers and sanitary napkins, for example, non-woven fabric, film and laminates formed from them.

The hook material 42 and the base sheet 41 forming the fastening tape 4 can be made of any materials traditionally used in sorbent articles, including disposable diapers. For example, hook material 42 may be a male component of a mechanical fastener such as Magic Tape® from Kuraray Co., Ltd .; Quicklon® from YKK Corp., and Magicloth® from Kanebo Bell-Touch, Ltd. The base sheet 41 may be a sheet or non-woven fabric made of a synthetic polymer, for example, polyethylene, polypropylene and polyethylene terephthalate, or composite materials made on the basis of two or more synthetic polymers.

Below, the advantages and effects obtained by using the diaper 1 of the present embodiment according to the first aspect of the invention will be discussed.

As shown in FIG. 2 and 3, the adhered region 6, where the fastening tape 4 and the side panel 3 are adhered to each other, includes a first adhered portion 6S formed by adhesive engagement and a second loosely adhered portion 6W located laterally outside adjacent to the first adhered portion 6S and having lower adhesion strength than the first adhered portion 6S. Thus, as shown in FIG. 4, when adjusting the diaper to the body of the user by pulling the fastening tape 4 by hand, if excessive pulling force is applied to the adhered area 6, the fastening tape and the side panel are likely to separate from each other, without destroying the substrate in the second weakly coupled portion 6W, t .e. closer to the distal edge 3S1 of the side panel 3 than the first engaged portion 6S. Thus, the second weakly engaged portion 6W, closer to the distal edge 3S1 of the side panel 3, easily undergoes disengagement, while the first engaged portion 6S is less likely to undergo engagement, leading to destruction of the substrate, so that the diaper 1 is able to maintain the wearing position and provides convenience use.

As shown in FIG. 2 and 3, since the second weakly coupled portion 6W is laterally outside adjacent to the first engaged portion 6S, the distal edge 3S1 of the side panel 3 is less likely to rotate or fold when fitting the diaper 1 to the wearer's body or while wearing, which increases ease of use. In particular, as shown in FIG. 2 and 3, since the side panel 3 of the diaper 1 is a stretch side panel, and since the fastening tape is attached only to the skin-side (Q side) of the stretch side panel 3, the above effect is brighter. In addition, since the second weakly coupled portion 6W is located laterally outside the first engaged portion 6S, rotation or folding of the distal edge 3S1 of the side panel 3 is also not allowed during the manufacturing and transportation of the diaper 1, which increases the production efficiency.

As shown in FIG. 2 and 3, the first engaged portion 6S is formed by adhesive adhesion and sealed adhesion, while the second weakly engaged portion 6W is formed only by sealed adhesion. In other words, the first adhered portion 6S has on its laterally-outer side a second weakly adhered portion 6W that does not contain adhesive. Thus, in the step of applying the adhesive to form the first bonded portion 6S, the likelihood of inadvertently applying the adhesive to the attachment tape 4 outside the distal edge 3S1 of the side panel is eliminated. As a result, the probability of adhesion of the accidentally applied adhesive to the fastening tape to other parts of the diaper 1 or to the skin of the user or to clothing is excluded, which ensures ease of use.

As shown in FIG. 2, some of the plurality of sealed ligaments 61 of the bonded region 6 (including the first bonded portion 6S and the second weakly bonded portion 6W) span the distal edge 3S1 of the stretched side panel 3 from two sides and extend laterally outward from the distal edge 3S1. In other words, each of the plurality of second densified ligaments 612 belonging to the second group 612G of densified ligaments located in the second loosely coupled portion 6W is arranged so as to cover the distal edge 3S1 of the side panel 3 on both sides. This configuration further prevents the distal from turning and folding the edges 3S1 of the side panel 3 when fitting the diaper 1 or while wearing the diaper 1. Ease of use is thus further enhanced.

As shown in FIG. 2, the diaper 1 has a fastening tape 4 attached to the side panel 3 in a place in the Y direction, which is closer to the upper edge of the stretching side panel 3 than to the opposite lower edge of the stretching side panel 3, while when the fixing tape 3 is tensioned at adjusting the diaper 1, the angle of inclination of the second fused ligament 612C (fused ligament 612, which is closest to the crotch section C, of fused ligaments 612 belonging to the second group 612G of fused ligaments) formed on the second weak-link Hinnom section 6W linked region 6 substantially coincides with the inclination angle of the second imaginary line IL2. When the fastening tape 3 is tensioned while fitting the diaper 1 to the wearer's body, the load is applied in a direction along the second imaginary line IL2. If the disengagement occurs at the location of the second fused ligament 612C closest to the crotch portion C where the load occurs, the amount of work required to disengage will be the largest since the angle of inclination substantially coincides with the angle of inclination of the second imaginary line IL2. Thus, the fastening tape and the side panel 3 will be less likely to separate from each other. Thus, the wearing state of the diaper is maintained, while the convenience of use is improved.

As shown in FIG. 3, the first engaged portion 6S of the engaged region 6 overlaps a portion of the distal fixed end portion 33O of the elastic link 33, i.e. a portion of the distal adhesive layer 36 forming the distal fixed end portion 33O of the elastic link 33. In other words, the elastic strands 33 move directly together with the attachment tape. When a dynamic action is applied to the adhered area 6 by tensioning the fastening tape 4 while fitting the diaper, the adhered area 6 is unlikely to be destroyed, causing inconvenience of use, since the elastic links 33 absorb the dynamic effect.

The disposable diaper according to the first aspect of the invention is not limited to the diaper 1 of the aforementioned embodiment, and various changes and modifications are possible.

For example, while the side panel of the diaper 1 is a stretchable side panel, as shown in FIG. 2, it may be an inextensible side panel. While the fastening tape 4 of the diaper 1 is attached only to the skin side (side Q) of the side panel 3, it can only be attached to the skin side (side P) of the side panel 3.

While in the diaper 1, some of the fused ligaments 61 of the adhered area 6 extend on both sides of the distal edge 3S1 of the side panel, as shown in FIG. 2, there may not be such fused ligaments covering on both sides.

In the diaper 1 shown in FIG. 2, the angle of inclination of the second fused ligaments 612 belonging to the second groups 612G of fused ligaments located in the linked region 6, coinciding with the angle of inclination of the second imaginary line IL2, may not coincide with the angle of inclination of the second imaginary line IL2.

While the adhered area 6 of the diaper 1 overlaps a portion of the distal fixed end portion 33O of the elastic threads 33 on the side panel 3 of the diaper 1 shown in FIG. 2, it may be located laterally outside the distal fixed end portion 33O.

While all of the second fused ligaments 612 belonging to the second fused ligament groups 612G located in the adhered region 6 have the same tilt angle in the diaper 1 shown in FIG. 2, they do not have to have the same angle. For example, the diaper 1A of another embodiment shown in FIG. 5 has the same characteristics as the diaper 1, except that only one of the densified ligaments 61, namely the most laterally external and the highest (closest to the upper end of the posterior portion B) of fused ligaments 61, i.e. . the second densified bundle 612, which is the uppermost of the densified bundles belonging to the second group 612G in the second weakly bonded portion 6W of the adhesion region 6 (hereinafter referred to as the second densified bundle 612B), has an angle of inclination different from the angle of inclination of the other densified bundles 61, so that when the fastening tape 3 is stretched when fitting the diaper to the body of the user, the angle of inclination of the second sealed bundle 612B essentially coincides with the angle of inclination of the third imaginary line IL3 connecting the intersection point of PU1, closer to the rear section B, between the distal edge of the side panel 3 and the upper edge of the mounting tape 4, and the intersection point PU2, located closer to the rear section B, between the side edge 2S1 of the absorbent assembly 2 and the upper edge of the side panel 3. The second sealed bundle 612B taken as the uppermost (closest to the upper end of the posterior portion B), is a compacted ligament, more than half of the area of which is located on the second weakly coupled portion 6W.

When the fastening tape 3 is tensioned while fitting the diaper 1A to the wearer's body, the load is applied not only in the direction along the second imaginary line IL2, but also in the direction along the third imaginary line IL3. Since the angle of inclination of the second fused ligament 612C, located below all, and the angle of inclination of the second fused ligament 612B, located above all at which the tensile load is created, essentially coincide with the angle of inclination of the second imaginary line IL2 and the third imaginary line IL3, respectively, the mounting tape 4 and the side panel 3 are separated from each other with even less probability. Thus, the wearing state of the diaper 1A is maintained, while the ease of use is further enhanced.

A disposable diaper according to a second aspect of the invention will now be described based on its preferred first embodiment with reference to FIG. 6-9.

As shown in FIG. 6, the disposable diaper 1B of the present embodiment (also referred to as “diaper 1B” hereinafter) includes a rectangular absorbent assembly 2 having a liquid-retaining absorbent member 23, a stretchable side panel 3 extending outward from both side portions 2S of the rear portion B the absorbent assembly 2, as well as the fastening tape 4, which is attached to the distal side portion 3S of each side panel 3 along the longitudinal direction of the absorbent assembly 2 (Y direction).

The diaper 1B is bilaterally symmetrical about the longitudinal center line CL. Thus, the bilaterally symmetrical parts of the diaper 1B will be described as a whole with respect to its right side.

In the context of the present description, the expression “skin side” refers to the side of the link forming the diaper 1B facing the skin of the user when the diaper is worn, which corresponds to the side marked with the letter P in FIG. 8. The expression “skin-side” refers to the side of the link forming the diaper 1B facing opposite to the skin of the wearer when the diaper is worn, which corresponds to the side marked with the letter Q in FIG. 8.

The direction indicated by the letter Y (direction Y) in FIG. 6-9 is a longitudinal direction of the absorbent assembly 2 of the diaper 1B parallel to the center line CL. The direction indicated by the letter X (direction X) in these figures is the lateral direction of the absorbent assembly 2 of the diaper 1B perpendicular to the center line CL. The diaper 1B will be shown below in detail.

As shown in FIG. 6, the absorbent assembly 2 is rectangular and longer in the Y direction, while it has a front portion A that can be worn from the side of the wearer's side, a rear section B that can be worn from the side of the user's back, and also a crotch section C made with the possibility of wearing from the crotch area of the user. The stretchable side panel 3 is attached to both side portions 2S of the rear portion B of the absorbent assembly 2 along the Y direction so as to extend laterally outward (in the X direction) from the side edge 2S1 of the absorbent assembly 2.

As shown in FIG. 6, the absorbent assembly 2 includes a liquid-retaining absorbent member 23, an upper sheet 21 located on the skin-facing side of the absorbent component 23, and an outer composite sheet located on the skin-facing side of the absorbent component 23. The absorbent assembly 2 is elongated at direction Y and is divided into a front section A, made to be worn from the side of the user's abdomen, a rear section, made to be worn from the side of the user's back, as well as a crotch section, located between the front section and the rear section. In other words, as shown in FIG. 6, the absorbent assembly 2 has a liquid-permeable topsheet 21, liquid-impermeable or moderately liquid-permeable (including water-repellent) outer composite sheet 22, and a liquid-retaining absorbent unit 23 located between sheets 21 and 22. As shown in FIG. 6, the upper sheet 21 and the outer composite sheet 22 cover the entire area respectively of the skin side of the skin and the side of the absorbent link 23 and extend further outwardly from the perimeter of the absorbent link 23. The upper sheet 21 and the outer composite sheet 22 are attached to each other by using an adhesive (eg, hot-melt adhesive) or by fusion bonding (eg, heat sealing) on its extensions from the outside of the absorbent link 23. The top sheet 21 has the same length as the outer sheet 22 in the direction Y, but shorter than the outer composite sheet 22 in the direction X. The outer composite sheet 22 has the same shape in plan view as the absorbent assembly 2.

A side sheet 24 is located on each side section 2S of the absorbent assembly 2 along the Y-direction by the top sheet 21. The side sheet 24 is attached to the skin side of the top sheet 21, extending along the entire length (in the Y direction) of each side section 2S. Laterally (in the X direction), the proximal edge of each side sheet 24 (an edge closer to the centerline CL) is a free edge. The side sheet 24 is provided near its free edge on the crotch portion C with elastic links 25, forming a leak-proof cuff, fixed in its stretched condition. When the elastic links 25 are contracted while wearing, the side sheet 24 rises from the free edge at a predetermined width from the top sheet 21 to form a leakproof cuff.

Each side sheet 24 extends laterally outward from the side portions 2S of the absorbent assembly 2 and is connected to the outer composite sheet 22 to form a valve. As shown in FIG. 6, in the diaper 1B, each valve in the crotch portion C is equipped with elastic links 26 that form assemblies around the legs in their stretched state in the Y direction. The elastic links 26 contract during wear to form assemblies around the legs.

As shown in FIG. 6, the rear portion B of the absorbent assembly 2 along each of its side portions 2S is equipped with a stretch side panel 3 extending laterally outward, with each side panel 3 having a fastening tape 4 extending laterally outward. The positional relationship between the stretch side panel 3 and the fastening tape 4 will be explained with reference to the diaper 1B. As shown in FIG. 7, if an imaginary line IL2 is drawn connecting the upper intersection point of PU1 between the absorbent assembly 2 and the stretch side panel 3 and the upper intersection point of PU2 between the stretch side panel 3 and the fastener tape 4, the positional relationship between the stretch side panel 3 and the fastener tape 4 is that the stretch side panel 3 has a region T1 directly above the imaginary line IL2, or, if you draw an imaginary line IL3 connecting the lower intersection point PD1 between the absorbent node 2 and the stretch I side panel 3 and a bottom intersection between PD2 stretchable side panel 2 and the fixing belt 4, stretchable side panel 3 has a region directly below T2 imaginary line IL3.

Although in the case of the diaper 1B shown in FIG. 7, the stretchable side panel 3 and the fastening tape 4 are interlocked so that the side panel 3 can have both a region T1 above the imaginary line IL2 and a region T2 below the imaginary line IL3, it is only necessary that the stretchable side panel 3 has either a top region T1, or lower region T2.

In the diaper 1B, as shown in FIG. 8, the stretch side panel 3 is attached to the skin-side of the outer composite sheet 22 of the side portion 2S of the absorbent assembly 2 by various known means so as to extend laterally outward from the side edge 2S1 of the absorbent assembly 2. Although the stretch side panels 3 are attached to the diaper 1B to the skin-facing side of the outer composite sheet 22, each of the stretched side panels 3 can be attached between the side sheet 24 (located on the side portion 2S) and the outer composite sheet 22.

Each stretch side panel 3 in the diaper 1B comprises a skin-facing sheet 31 located on the skin-facing side of the stretch side panel 3, a skin-facing sheet 32 located on the skin-side of the stretch side panel 3, and a plurality of elastic links 33. fixed between them in their expanded state in the X direction. The distal side portion 3S of the stretched side panel 3 has a length in the Y direction greater than the length in the same direction of the first section 6 of the fastening tape 4. More specifically, as shown in FIG. 7, the stretchable side panel 3 of the diaper 1B is rectangular in its planar configuration, or it can be trapezoidal or curved in its planar configuration if the length in the Y direction of the distal side edge of the stretchable side panel 3 exceeds the length in the same direction the first adhered portion 6 of the fastening tape 4. The sheet 31 facing the skin and the sheet 32 facing away from the skin, forming the stretch side panel 3, have the same shape in the plan view as the stretch side panel 3 in their flat configuration. The plurality of elastic links 33 are configured to extend in the X direction, being generally uniformly spaced and parallel to each other in the Y direction.

Although each of the side panels 3 of the diaper 1B consists of two sheets of non-woven fabric (facing the skin of the sheet 31 and facing the skin of the sheet 32), having a plurality of thread-like elastic links (which will also be called elastic threads) 33 fixed between them, the stretch side panel 3 may be a composite sheet including two sheets of nonwoven fabric (sheet 31 facing the skin and sheet 32 facing the skin), as well as an elastomeric film or an elastomeric mesh located and fixed between the two sheets of nonwoven fabric. The elastic thread 33 may have a generally round, square or rectangular cross section.

Although the skin-facing sheet 31 and the skin-facing sheet 32 forming the stretchable side panel 3 of the diaper 1 have the same shape and size as shown in FIG. 7 and 8, an elongated segment of the skin-facing sheet 31 extending from the side edge 2S1 of the absorbent assembly 2 may differ from an elongated segment of the skin-facing sheet 32 extending from the side edge 2S1 of the absorbent assembly 2. In the case where the side panel 3 is formed to face to the skin by a sheet 31 and a sheet turned away from the skin 32, elongated segments of which are different from the side edge 2S1, the distal portion of the distal side portion 3S of the stretched side panel 3 should be formed either by the sheet 31 facing the skin, l for the sheet 32 turned away from the skin. In this case, the distal side portion 3S of the stretched side panel 3 will have increased softness.

The elastic thread 33 located in the stretchable side panel 3 preferably has a width (size in the Y direction) or has a diameter of 0.1-2 mm, more preferably 0.1-1 mm, from the point of view of increasing flexibility and ensuring the extensibility of the stretchable side panel 3. The number of elastic threads 33 located in the stretchable side panel 3 is preferably from 1 to about 25, more preferably from 3 to 20. The extension of the elastic thread 33 is determined according to traditional knowledge. Preferably, the elastic yarns 33 experiencing a stress of 0.1-1 N per thread at 100% elongation are fixed at elongation of 50% -300%, more preferably at elongation of 100% -250%. The expression "elongation" in the context of the present description means the ratio of elongation to natural length. When, for example, a 10 cm elastic thread is extended to 20 cm, the elongation is 100%.

In the case where the stretchable side panel 3 has an elastomeric film or mesh instead of elastic threads 33, it is preferable that the elastomeric mesh experiencing a stress of 3-25 N / 25 mm width at 100% elongation is fixed at elongation of 50% -300%, more preferably 100% -250%.

A plurality of elastic threads 33 are secured between the skin facing sheet 31 and the skin facing sheet 32 in their stretched state by a plurality of adhesive layers (not shown). In areas of the stretchable side panel 3, where there are no elastic threads 33, the skin-facing sheet 31 and the skin-facing sheet 32 are directly adhered to each other by means of adhesive layers not shown. Each of the plurality of adhesive layers not shown extends in the Y direction, preferably across each elastic thread 33 extending in the X direction. Each of the plurality of adhesive layers not shown, more preferably extends along the entire length of the stretch side panel 3 in the Y direction. The adhesive layers not shown are substantially uniformly spaced apart X direction. The stretch side panel 3 is formed by applying adhesive to the skin-facing sheet 31 or to the skin-facing sheet 32, or both, by any means by strips, and then joining two sheets 31 and 32 under pressure, when the elastic threads 33 are located between them in their stretched state. Each of the elastic links 33 of the thus formed stretchable side panel 3 has a proximal fixed end portion 33I (closer to the centerline CL) and a distal fixed end portion 33O, as shown in FIG. 7 and 8. The elastic threads 33 are not able to contract at their proximal fixed portion 33I (closer to the centerline CL) and the distal fixed end portion 33O, while the proximal fixed portion 33I and the distal fixed end portion 33O are not elasticized. In the relaxed state of the stretch side panel 3 shown in FIG. 7, the length (dimension in the X direction) of the distal fixed end portion 33O is preferably 10% -40%, more preferably 15% -35%, of the total length (in the X direction) of the elastic thread 33. The length of the proximal fixed end portion 33I is the same. Fastening in the stretchable side panel 3 can be accomplished by combining adhesive adhesion using adhesive layers not shown and bonding by fusion, for example by heat sealing.

As shown in FIG. 7 and 8, the skin-facing sheet 31 of the stretchable side panel 3 of the diaper 1B has an extension 31S extending laterally outward from the distal fixed end portions 33O of the plurality of elastic threads 33, while the sheet 31 not on the skin side has the same extension 32S extending laterally outward from the distal fixed end portions 33O of the plurality of elastic strands 33. The extensions 31S and 32S are adhered to each other by continuous application of the adhesive in a known manner, followed by compression between them. The engagement of extensions 31S and 32S can be accomplished by fusion bonding instead of adhesive bonding, or by combining fusion bonding and adhesive bonding to prevent the distal side portion 3S from being pulled outward during operation.

A fastening tape 4 provided on the distal side portion 3S of each stretch side panel 3 will be described in detail. The fastening tape 4 includes a base sheet 41 and a hook material 42 having a plurality of engaging protrusions in a distal portion of the base sheet 41. The fastening tape 4 is folded back before use and is folded in use as shown in FIG. 8. As shown in FIG. 7, the fastening tape 4 of the diaper 1B is rectangular and longer in the X direction in its unfolded state. The fastening tape 4 is formed by creating a base sheet 41 having the same shape in a plan view as the fastening tape 4, and attaching the hook material 42 to the distal portion of the base sheet 41. The diaper 1B has on the outside of the front portion A a landing sheet 5, on which the hook material 42 of the fixing tape 4 is fixed.

In a more detailed description of securing the fixing tape 4 to the stretchable side panel 3, it should be noted that the fixing tape 4 is attached to the skin-side (Q side) of the stretchable side panel 3, as shown in FIG. 8. Namely, as shown in FIG. 8, in the diaper 1B, the proximal (closer to the centerline CL) end portion of the fastening tape 4 is attached to the skin-side (Q side) of only extension 32S located laterally outside the distal anchored end portion 33O of the elastic thread 33 facing away from the skin of sheet 32 forming a stretch side panel 3.

As shown in FIG. 7 and 8, the fixing tape 4 is engaged with the stretch side panel 3 in the first engaged portion 6. The first engaged portion 6 is located inward from the distal side edge 3S1 of the stretched side panel 3 at a distance S. Thus, as shown in FIG. 7 and 8, an unconnected portion 7 is formed between the first bonded portion 6 and the distal side edge 3S1 of the stretched side panel 3. The unengaged portion 7 is a portion where the fastening tape 4 and the stretched side panel 3 are not engaged with each other, and continues continuously in the direction Y. In a more detailed description of the first bonded portion 6, it should be noted that the first bonded portion 6 of the diaper 1B is formed by both heat sealing or ultrasonic welding and adhesive adhesion, as shown in FIG. 8. The connection by heat welding or ultrasonic welding helps to configure the first bonded section 6 and facilitates the solution of the problem of increasing adhesion strength. Adhesive adhesion provides flexibility to the first adhered portion 6. Since the fastening of the fastening tape 4 on the stretchable side panel 3 in the diaper 1B is achieved by fusion and adhesive adhesion at the same time, the adhesion between the fastener tape 4 and the stretch side panel 3 is further enhanced.

More specifically, as shown in FIG. 7 and 8, the first interlocked portion 6 includes fused bundles 61, where the fastening tape 4 and the stretchable side panel 3 are fused to each other by heat welding or ultrasonic welding, and also the non-fused region 62, where the fastener tape 4 and the stretchable side panel 3 is not fused to each other. As shown in FIG. 7, the first linked portion 6 has a plurality of fused bundle groups 61G each of which consists of a plurality of small fused bundles 61 uniformly spaced in the Y direction, with the plurality of fused bundle groups 61G being arranged in the X direction such that the fused bundles 61 of the same fused group 61G ligaments and fused ligaments 61 of an adjacent group 61G of fused ligaments are not aligned with each other in the X direction. More specifically, the fused ligaments 61 of the diaper 1B include, as shown in FIG. 7, the first elongated fused ligaments 611, inclined at an angle to the Y direction, and the second elongated fused ligaments 612, inclined so as to face opposite to the first elongated fused ligaments 611. In the context of the present description, the expression “be facing opposite” means that if draw an imaginary line IL1 (see Fig. 7) parallel to the centerline CL, and place the imaginary fused ligaments 611 symmetrically to the first fused ligaments 611 relative to the line IL1, the angle of the imaginary fused ligaments approx 611 relative to the direction Y coincide with the angle of the second fused bundles 612 relative to the direction Y. As shown in FIG. 7, fused ligament groups 61G in the diaper 1B include first fused ligament groups 611G, each of which consists of first fused ligaments 611 uniformly spaced in the Y direction, and second fused ligament groups 612G, each of which consists of second fused ligaments 612 evenly spaced in the Y direction. As shown, the first bonded portion 6 of the diaper 1B has only two first groups of fused ligaments 611G and only two second groups of fused ligaments 612G arranged alternately in the X direction. Thus, the first fused ligaments 611 forming one first group 611G of fused ligaments and the second fused ligaments 612 forming an adjacent second group 612G of fused ligaments are not aligned with each other in the X direction and are displaced in the Y direction. The area between adjacent fused ligaments 61 (including the first fused ligaments 611 and second fused ligaments 612) is a region 62 not fused. The presence of such an area 62 not adhered by fusion gives increased flexibility to the first adhered portion 6. The presence of the area 62 not adhered by fusion also makes the fused bundles 61 resistant to wrinkling and gives flexibility to the first adhered area 6.

As shown in FIG. 8, the first adhered portion 6 of the diaper 1B also has an adhesive adhered area 63 in which the fastening tape 4 and the stretchable side panel 3 are adhered. Adhesively adhered region 63 continuously extends along the entire length of the fastening tape 4 in the Y direction (parallel to the centerline CL), and in width matching the width of the four groups 61G of fused ligaments (the first two groups 611G of fused ligaments and the two second groups 612G of fused ligaments) in X direction. Thus, an unlinked portion 7 is created, continuously extending in the Y direction parallel to the center line CL, having a constant width equal to the distance S. Although the width of the adhesive-adhered region 63 of the diaper 1B is the same as the width PEX groups fused 61G ligaments width adhesive bonding region 63 need not always be equal to the width of four groups fused 61G ligaments, provided that the presence of the non-adhering portion 7.

The length in the Y direction of the stretch side panel 3 having an overlap region (i.e., the first engaged portion 6 and the unengaged portion 7), where the stretch side panel 3 and the fastener tape 4 overlap, exceeds the length in the Y direction of the fastener tape 4 in the overlap region. In the context of the present description, the expression “length in the Y direction” means the maximum length of the stretch side panel 3 or the fastener tape 4 within the width in the X direction of the overlap region where the stretch side panel 3 and the fastener tape 4 overlap. The length in the Y direction of the stretch side panel 3 having an overlap region, preferably 1.2-3.5 times, more preferably 1.4-3.0 times, exceeds the length in the Y direction of the fastening tape 4 in the overlap region to facilitate fitting diaper under the user, without causing the user inconvenience, and apply force to rotate the stretching side panel 3 inward in the direction of the skin of the user.

The area in the plan view of the overlapping region is preferably 10% -50%, more preferably 10% -40%, of the total area of the stretchable side panel 3 in its natural relaxed state, bearing in mind the adhesion strength.

The area of the first bonded portion 6 is preferably 40% -90%, more preferably 50% -85%, of the area of the overlap region in terms of providing an unlinked region 7 and adhesion strength.

From the point of view of maintaining the degree of freedom of the lateral edge portion of the stretchable side panel 3 during wearing, the area of the unengaged portion 7 is preferably 10% -50%, more preferably 15-40%, of the area of the overlap area.

The shape of the fused ligaments 61 (including the first fused ligaments 611 and the second fused ligaments 612) is not particularly limited and may be round, rhombic, triangular, polygonal or otherwise, as well as an elongated annular, as in diaper 1B. The area of individual fused ligaments 61 (individual first fused ligaments 611 or individual second fused ligaments 612) is preferably 2-30 mm ² , more preferably 2-20 mm ² , from the point of view of increasing adhesion without causing any inconvenience to the user. The distance between the two first fused bundles 611 or the second fused bundles 612 adjacent in the Y direction is preferably 1 to 8 mm, more preferably 6 mm or less, from the same point of view. The distance between the nearest fused bundles 61 (i.e., between the first fused bundle 611 and the nearest second fused bundle 612) is preferably from 1 to 8 mm, more preferably 6 mm or less, from the same point of view. From the same point of view, the number of fused bundles 61 (including the first fused bundles 611 and the second fused bundles 612) per unit area is preferably 1 to 16 per cm ² , more preferably 2-10 per cm ² . The ratio of the total area of the fused ligaments 61 (including the first fused ligaments 611 and the second fused ligaments 612) to the area of the first bonded portion 6 is preferably 10% -70%, more preferably 10% -50%, from the same point of view.

Next, materials forming the diaper 1B will be described.

The top sheet 21, the outer composite sheet 22 and the absorbent element 23 constituting the absorbent assembly 2 can be made of any materials traditionally used in sorbent articles, including disposable diapers and sanitary napkins. For example, the topsheet 21 may be a hydrophilic, liquid permeable nonwoven web or a three-dimensional perforated film. The outer composite sheet 22 may consist of a liquid-impermeable or moderately permeable (including water-repellent) polymer film and a non-woven fabric made in various ways (for example, a nonwoven fabric from a melt using fastening by passing air, from the melt, using water-jet bonding or needle-punched bonding). The absorbent unit 23 may consist of an absorbent core formed by a plurality of fibers (e.g., cellulose fibers) or a non-woven fabric that may contain absorbent polymer particles, as well as a core wrapping layer formed of a permeable fabric or non-woven fabric that wraps the absorbent core. The side sheet 24 forming the leakproof cuff may be a film, a nonwoven fabric, a woven fabric or a layered structure of these sheet materials.

The skin-facing sheet 31 and the skin-facing sheet 32 of the stretch side panel 3, as well as the base sheet 42 of the fastening tape 4 can be made of any sheet materials commonly used in sorbent articles, such as disposable diapers and sanitary napkins. For example, the skin-facing sheet 31, the skin-facing sheet 32, as well as the base sheet 42 may be formed from a non-woven fabric, woven fabric, film, or laminate from these sheet materials.

The elastic thread 33 forming the stretch side panel 3, the elastic link 25 forming the leakproof cuff, and the leg elastic link 26 may be an elastic thread or thread of natural rubber, polyurethane, isoprene-styrene copolymer, butadiene-styrene copolymer or ethylene α-olefin copolymer (for example, a copolymer of ethyl acrylate and ethylene). Preferably, the elastic yarns 33 used in the side panel 3 are of the same type and have the same elongation in terms of production costs and simplicity of production technology.

Preferred materials for the adhesive used to form the adhesive-bonded region 63 for bonding the fastener tape 4 to the stretch side panel 3, and the adhesive used for bonding various other links include thermoplastic polymers such as amorphous polyolefins, ethylene vinyl acetate (EVA), ethylene copolymers acryl ether copolymers (EEA), styrene-butadiene-styrene block copolymers (SBS), styrene-isoprene-styrene block copolymers (SIS), styrene-ethylene / butylene-styrene block copolymers (SEBS), and also a block copolymers styrene-ethylene / propylene-styrene (SEPS), or mixtures thereof. Hot melt adhesives are preferred.

The hook material 42 and the base sheet 41 forming the fastening tape 4 can be made of any materials traditionally used in sorbent articles, including disposable diapers. For example, hook material 42 may be a male component of a mechanical fastener such as Magic Tape® from Kuraray Co., Ltd .; Quicklon® from YKK Corp., and Magicloth® from Kanebo Bell-Touch, Ltd. The base sheet 41 may be a sheet or non-woven fabric made of a synthetic polymer, for example, polyethylene, polypropylene and polyethylene terephthalate, or composite materials made on the basis of two or more synthetic polymers.

Below, the advantages and effects obtained by using the disposable diaper 1B of the present embodiment according to the second aspect of the invention will be discussed.

As shown in FIG. 7 and 8, the fastening tape 4 is attached only to the skin-side (Q side) of the stretch side panel 3, while the unengaged portion 7 continuously extends in the Y direction between the first engaged portion 6, where the fastener tape 4 and the stretch side panel 3 are engaged between by itself, and the distal side edge 3S1 of the stretchable side panel 3. Due to the presence of an unlinked portion 7, the peripheral portion of the stretchable side panel 3 is rotated in the direction of the skin side (side P), as shown in FIG. 9, when the fastening tape 4 is pulled by hand to stretch the stretch side panel 3 while fitting the diaper 1B to the wearer's body. After the hook material 42 of the fastening tape 4 of the rear portion B is pressed and secured to the landing sheet 5 of the front portion A, when the peripheral portion of the stretchable side panel 3 is turned to the side facing the skin (side P), clothes worn over the worn diaper, c less likely to catch on the peripheral edge of the stretchable side panel 3. Thus, the convenience of using the diaper is increased.

A second aspect of the invention will now be described with reference to its second to sixth embodiments. Disposable diapers 1C-1G in the second to sixth embodiments are different from the diaper 1B in terms of the adhesion of the fastening tape 4 and the stretchable side panel 3 to each other. The diapers 1C-1G will be illustrated mainly with reference to the difference from the diaper 1B in the first embodiment. Identical links are denoted by the same positions, and their excessive description is not given. The description of the diaper 1B of the first embodiment is applicable to the second to sixth embodiments, unless otherwise indicated.

Next, the fixing of the fixing tape 4 to the stretchable side panel 3 in the diaper 1C will be described.

Similar to diaper 1B, as shown in FIG. 10, the fastening tape 4 of the diaper 1C is attached at its proximal portion (closer to the centerline CL) only to the skin-side (side Q) of only the extension 32S (the portion located laterally outside the distal fixed end portion 33O of the elastic thread 33) facing away the skin of the sheet 32 forming the stretchable side panel 3 in the first bonded portion 6. In other words, the fastening tape 4 is attached only to the skin side (side Q) of the stretchable side panel 3.

By analogy with the diaper 1B, the fastening tape 4 and the stretchable side panel 3 of the diaper 1C are coupled by means of a fusion joint and an adhesive clutch.

By analogy with the diaper 1B, the first bonded portion 6 of the diaper 1C has fused bundles 61 and a fusion-free region 62, as shown in FIG. 10.

As shown in FIG. 10, the fused bundles 61 of the diaper 1C include only the elongated first fused bundles 611 having an angle of inclination relative to the Y direction. The first bonded portion 6 of the diaper 1C has two first groups 611G of fused bundles, each of which consists of spatially spaced first fused bundles 611 in the Y direction, wherein the first two groups 611G of fused ligaments are arranged in the X direction so that the first fused ligaments 611 of one of the first groups 611G of fused ligaments and the first fused ligaments 611 of the other first 611G group fused ligaments are not misaligned, and are aligned in the direction X, creating a first series of fused bundles 611, parallel to the direction X. As shown in FIG. 10, each space between adjacent fused bundles 61 forms a region 62 not fused to.

By analogy with the diaper 1B, the first adhered portion 6 of the diaper 1C also has an adhesive adhered area 63, where the fastening tape 4 and the stretchable side panel 3 are adhered by an adhesive. Adhesively adhered region 63 continuously extends along the entire length of the fastening tape 4 in the Y direction (parallel to the centerline CL) and has a width substantially coinciding with the width of the two fused ligament groups 611G in the X direction. Thus, an unengaged portion 7 is created that continuously extends into direction Y parallel to the center line CL having a constant width equal to the distance S.

The diaper 1C has the same advantages that are obtained when using the disposable diaper 1B.

The fixing of the fastening tape 4 on the stretchable side panel 3 in the diaper 1D is as follows.

As shown in FIG. 11, the first engaged portion 6 in the diaper 1D overlaps a portion of the distal fixed end portion 33O of the elastic link 33 of the stretch side panel 3. In the diaper 1D, the proximal portion (located closer to the center line CL) of the fastening tape 4 is attached to the skin-facing sheet 32 of the stretch side panel 3 on the first engaged portion 6. The first engaged portion 6 is located on a portion of the region of the skin-facing sheet 32 forming the stretch side panel 3 corresponding to the region where the distal the fastened end portion 33O of the elastic links 33, as well as on the extension 32S of the skin-facing sheet 32 laterally outside the distal fixed end portion 33O of the elastic links 33. The proximal portion of the fastening tape 4 is attached only to the skin-side (Q side) of the skin-away portion of the sheet 32 corresponding to the position of the distal fixed end portion 33O and the extension 32S on the first engaged portion 6. Thus, the fastening tape 4 is attached only to the skin-side (side Q) growing ivayuscheysya side panel 3.

By analogy with the diaper 1B, the fastening tape 4 and the stretchable side panel 3 of the diaper 1D are coupled by means of a fusion joint and an adhesive clutch.

By analogy with the diaper 1B, the first bonded portion 6 of the diaper 1D has fused bundles 61 and a fusion-free region 62, as shown in FIG. eleven.

As shown in FIG. 10, the fused bundles 61 of the diaper 1D include only the elongated first fused bundles 611 having an angle of inclination relative to the Y direction. The first bonded portion 6 of the diaper 1D has two first groups 611G of fused bundles, each of which consists of spatially spaced first fused bundles 611 in the Y direction, wherein the first two groups 611G of fused ligaments are arranged in the X direction so that the first fused ligaments 611 of one of the first groups 611G of fused ligaments and the first fused ligaments 611 of the other first 611G group fused ligaments are not misaligned, and are aligned in the direction X, creating a first series of fused bundles 611, parallel to the direction X. As shown in FIG. 11, each space between adjacent fused bundles 61 forms an area 62 not fused by fusion.

By analogy with the diaper 1B, the first adhered portion 6 of the diaper 1D also has an adhesive adhered area 63, where the fastening tape 4 and the stretchable side panel 3 are adhered by an adhesive. Adhesively adhered region 63 continuously extends along the entire length of the fastening tape 4 in the Y direction (parallel to the centerline CL) and has a width substantially coinciding with the width of the two fused ligament groups 611G in the X direction. Thus, an unengaged portion 7 is created that continuously extends into direction Y parallel to the center line CL having a constant width equal to the distance S.

The benefits and effects of using the 1D diaper will be described below.

The description will boil down to an explanation of the differences from the benefits and effects provided by the 1B diaper. Otherwise, the description of the benefits and effects provided by diaper 1B remains valid.

As shown in FIG. 11, the first adherent portion 6 of the diaper 1D overlaps a portion of the distal anchored end portion 33O of the elastic threads 33 of the stretchable side panel 3. The adhesion strength of the distal anchored end portion 33O of the elastic links 33 is thereby improved.

Next, the fixing of the fixing tape 4 on the stretchable side panel 3 in the diaper 1E will be described.

Similar to diaper 1B, as shown in FIG. 12, the fastening tape 4 of the diaper 1E is attached at its proximal portion (closer to the centerline CL) only to the skin-side (Q side) of only extension 32S (the portion laterally outside the distal anchored end portion 33O of the elastic thread 33) facing away from the skin of the sheet 32 forming the stretchable side panel 3 in the first bonded portion 6. In other words, the fastening tape 4 is attached only to the skin side (side Q) of the stretchable side panel 3.

The fastening tape 4 and the stretchable side panel 3 of the diaper 1E are engaged only by fusion bonding.

By analogy with the diaper 1B, the first bonded portion 6 of the diaper 1E has fused bundles 61 and a fusion-free region 62, as shown in FIG. 12.

As shown in FIG. 12, the fused bundles 61 of the diaper 1E include only elongated third fused bundles 613 extending in the X direction parallel to each other. The first bonded portion 6 of the diaper 1E has two third groups 613G of fused ligaments, each of which consists of third fused ligaments 613 spatially spaced in the Y direction along a line that is convex laterally outward, with two third groups 613G of fused ligaments located in the X direction. As shown in FIG. 12, each space between adjacent fused bundles 61 forms a region 62 not fused to. As shown in FIG. 12, the first bonded portion 6 of the diaper 1E formed by two groups 613G of fused ligaments is convex laterally outward, with the highest (laterally outermost) point lying on the longitudinal center line CL3 of the fixing tape 4, extending in the longitudinal direction of the fixing tape 4. Thus , the uncoupled portion 7 of the diaper 1E has a concavity in the laterally-outer direction. Namely, the width of the unengaged portion 7 (distance S) of the diaper 1E in the lateral direction gradually increases from the middle located on the center line CL3, both up and down from the center line CL3. The unengaged portion 7 of the diaper 1E thus formed is continuous in the Y direction, while the width of the unengaged portion 7 increases in the direction of both its longitudinal (upper and lower) ends 7E.

In terms of maintaining the unengaged portion 7 and the adhesion strength, the area of the first bonded portion 6 of the diaper 1E is preferably 40% -90%, more preferably 50% -85%, of the area of the above overlap area.

In order to maintain the degree of freedom of the lateral edge portion of the stretchable side panel 3 during wearing, the area of the unengaged portion 7 of the diaper 1E is preferably 10% -50%, more preferably 15% -40%, of the area of the overlap area.

The shape of the fused ligaments 61 (third fused ligaments 613) is not particularly limited and may be round, rhombic, triangular, polygonal or otherwise, as well as an elongated annular, as in diaper 1E. The area of the individual third fused bundles 613 (individual fused bundles 61), the distance between the third fused bundles 613 adjacent in the Y direction, the number of third fused bundles 613, the ratio of the total area of the third fused bundles 613 are the same as the fused bundles 61 of the diaper 1B ( first fused ligaments 611 and second fused ligaments 612).

The benefits and effects of using the 1E disposable diaper will be described below.

The description will boil down to an explanation of the differences from the benefits and effects provided by the 1B diaper. Otherwise, the description of the benefits and effects provided by diaper 1B remains valid.

Since the width of the unengaged portion 7 increases in the direction of both its upper and lower ends 7E, as shown in FIG. 12, the peripheral portion of the stretchable side panel is more susceptible to rotation in the direction of the skin side (side P) when the fastening tape 4 is stretched by hand to stretch the stretchable side panel 3 while fitting the diaper 1E to the wearer's body. Thus, the convenience of using the diaper is further enhanced.

Since the first engaged portion 6 of the diaper 1E has a bulge in the laterally-outer direction, as shown in FIG. 12, the pulling force applied to the first engaged portion 6 tends to be distributed, thereby preventing destruction of the first engaged portion 6 when the fastening tape 4 is pulled by hand when fitting the diaper 1E.

Next, fixing the fastening tape 4 to the stretchable side panel 3 in the diaper 1F will be described.

Similar to diaper 1B, as shown in FIG. 13, the fastening tape 4 of the diaper 1F is attached at its proximal portion (closer to the centerline CL) only to the skin-facing side (side Q) of only the extension 32S (the portion located laterally outside the distal fixed end portion 33O of the elastic thread 33) facing away from the skin of the sheet 32 forming the stretchable side panel 3 in the first bonded portion 6. In other words, the fastening tape 4 is attached only to the skin side (side Q) of the stretchable side panel 3.

The fastening tape 4 and the stretchable side panel 3 of the diaper 1F are engaged only by adhesive adhesion using an adhesive.

The first bonded portion 6 of the diaper 1F has an adhesively bonded region 63, where the fastening tape 4 and the stretchable side panel 3 are engaged using adhesive. Adhesively adhered region 63 continuously extends in the Y direction along the entire length in the Y direction of the fastening tape 4. More specifically, as shown in FIG. 13, the first adhered portion 6 of the diaper 1F (adhesive adhered area 63) extends laterally outward, with its laterally outermost (highest) point being located on the longitudinal center line CL3 of the fastening tape 4, extending in the longitudinal direction of the fastening tape 4. Thus, the proximal the edge of the unengaged portion 7 of the diaper 1F forms a recess in the laterally-outer direction. Namely, the width of the unengaged portion 7 (distance S) of the diaper 1F in the lateral direction gradually increases from the middle located on the center line CL3, both up and down from the center line CL3. The unengaged portion 7 of the diaper 1F thus formed is continuous in the Y direction, while the width of the unengaged portion 7 increases in the direction of both of its longitudinal ends 7E.

From the point of view of adhesion strength, the area of the first adhered portion 6 of the diaper 1E is preferably 50% -90%, more preferably 60% -90%, of the area of the above overlap region.

In order to maintain the degree of freedom of the lateral edge portion of the stretchable side panel 3 during wearing, the area of the unengaged portion 7 of the diaper 1F is preferably 10% -50%, more preferably 10% -40%, of the area of the overlap area.

The benefits and effects of using the 1F disposable diaper will be described below.

The description will boil down to an explanation of the differences from the benefits and effects provided by the 1B diaper. Otherwise, the description of the benefits and effects provided by diaper 1B remains valid.

Since in the diaper 1F, the width of the unengaged portion 7 increases in the direction of both of its longitudinal ends 7E, as shown in FIG. 13, the peripheral portion of the stretchable side panel 3 is more susceptible to rotation in the direction of the skin side (side P) when the fastening tape 4 is stretched by hand to stretch the stretchable side panel 3 while fitting the diaper 1F to the wearer's body. Thus, the convenience of using the diaper is further enhanced.

Since the first adhered portion 6 of the diaper 1F is formed only by adhesive adhesion, it is highly soft. As shown in FIG. 13, since the first engaged portion 6 extends laterally outward, the pulling force applied to the first engaged portion 6 tends to be distributed, thereby preventing destruction of the first engaged portion 6 when the fastening tape 4 is pulled by hand when fitting the diaper 1F.

Next, the fixing of the fastening tape 4 and the stretchable side panel 3 in the diaper 1G will be described.

Similar to diaper 1B, as shown in FIG. 14, the fastening tape 4 of the diaper 1G is attached at its proximal portion (closer to the centerline CL) only to the skin side (side Q) of only extension 32S (the portion laterally outside the distal fixed end portion 33O of the elastic thread 33) facing away from the skin of the sheet 32 forming the stretchable side panel 3 in the first bonded portion 6. In other words, the fastening tape 4 is attached only to the skin side (side Q) of the stretchable side panel 3.

The fastening tape 4 and the stretchable side panel 3 of the diaper 1G are engaged only by adhesive adhesion.

The first bonded portion 6 of the diaper 1G has an adhesively bonded region 63, where the fastening tape 4 and the stretchable side panel 3 are engaged using adhesive. Adhesively adhered region 63 continuously extends in the Y direction along the entire length in the Y direction of the fastening tape 4. More specifically, as shown in FIG. 14, the first bonded portion 6 of the diaper 1G (adhesive bonded area 63) extends laterally outward, with its laterally outermost point being located above the center line CL3 extending in the longitudinal direction of the fastening tape 4. Thus, the proximal edge of the uncoupled portion 7 of the diaper 1G forms deepening in the lateral-external direction. Namely, the deepest point of the unengaged portion 7 of the diaper 1G is located above the center line CL3, while the width (distance S) of the unengaged portion 7 in the lateral direction gradually increases both up and down from the deepened point. The unlinked portion 7 of the diaper 1G thus formed is continuous in the Y direction and is as narrow as possible in place above the center line CL3 of the fastening tape 4.

From the point of view of adhesion, the area of the first adhered portion 6 of the diaper 1G is preferably 50% -90%, more preferably 60% -90%, of the area of the above overlap.

In order to maintain the degree of freedom of the lateral edge portion of the stretchable side panel 3 during wearing, the area of the unengaged portion 7 of the diaper 1G is preferably 10% -50%, more preferably 10% -40%, of the overlap area. Thus, the length of the first bonded portion 6 of the diaper 1G is equal to that in the diaper 1F.

The benefits and effects of using the 1G diaper will be described below.

The description will boil down to an explanation of the differences from the benefits and effects provided by the 1B diaper. Otherwise, the description of the benefits and effects provided by diaper 1B remains valid.

Since the width of the unengaged portion 7 is minimal in place above the center line CL3 of the fixing tape, as shown in FIG. 14, the peripheral portion, in particular the lower portion of the peripheral portion of the stretch side panel 3, is more susceptible to rotation in the direction of the skin side (side P) when the fastening tape 4 is stretched by hand to stretch the stretch side panel 3 while fitting the diaper 1G to the body user. Thus, the convenience of using the diaper is further enhanced.

Since the first adhered portion 6 of the diaper 1G is formed only by adhesive adhesion, it is highly soft. As shown in FIG. 14, since the first engaged portion 6 extends laterally outward, the pulling force applied to the first engaged portion 6 tends to be distributed, thereby preventing destruction of the first engaged portion 6 when the fastening tape 4 is pulled by hand when fitting the diaper 1G.

The disposable diaper according to the second aspect of the invention is in no way limited to the first embodiment of the diaper 1B, and various changes and modifications are possible.

The disposable diaper according to the second aspect of the invention is not limited to the first to sixth diapers 1B-1G, various changes and modifications are possible. The constituent features of the diapers 1B-1G of the first to sixth embodiments are interchangeable between the embodiments within the scope of the second aspect of the invention, as will be shown in the examples below.

Although each of the stretchable side panels 3 used in the diapers 1B-1G of the first to sixth embodiments consists of a sheet facing the skin 31 and a sheet facing the skin 32 with a plurality of elastic threads 33 fixed between them in their stretched state in the direction X as shown in FIG. 7 and 10-14, the stretch side panel 3 may be a stretch film, a stretch woven or non-woven fabric, or a composition formed by these sheet materials.

Although the fastening tape 4 in the diapers 1B-1G according to the first to sixth embodiments is attached only to the skin-side (Q side) of the stretch side panel 3, as shown in FIG. 8, it is only necessary that the fastening tape 4 is attached at least to the skin-side (Q side) of the stretched side panel 3.

Features described as distinctive with respect to one of the aforementioned embodiments in the first and second aspects of the invention are interchangeable between embodiments and between aspects of the invention.

In relation to the above embodiments, parts of the claims are also disclosed.

[1] A disposable diaper comprising an elongated absorbent assembly having a liquid-retaining absorbent unit, a top sheet located on the skin side of the absorbent unit, and a back sheet located on the skin side of the absorbent unit, wherein the absorbent unit is divided into the front a section configured to be worn from the side of the user's abdomen, a rear section made to be worn from the side of the user's back, as well as a crotch section, are located between the front portion and the rear portion, the diaper has a longitudinal direction which coincides with the longitudinal direction of the absorbent assembly, as well as a lateral direction perpendicular to the longitudinal direction,

the diaper further comprises a stretchable side panel attached to both portions of the sides of one longitudinal end portion of the absorbent assembly and extending outward in a lateral direction, as well as a fastening tape attached to a distal side portion of each stretchable side panel and extending outward in a lateral direction,

the fixing tape is adhered to the skin-facing side of the stretchable side panel,

the fastening tape is adhered by the first interlocked portion, where the fastening tape and the stretchable side panel are adhered to each other by adhesive adhesion using an adhesive, wherein the first interlocked portion is laterally inward from the distal side edge of the stretchable side panel, wherein

an unengaged portion or a second weakly bonded portion is formed between the first bonded portion and the distal lateral edge of the stretched side panel, wherein

an unengaged portion is a portion where the fastening tape and the stretchable side panel are not engaged with each other, extending along the entire length of the fastening tape in the longitudinal direction, wherein

the second loosely coupled portion is a portion where the fastening tape and the stretchable side panel are bonded to each other with lower adhesion strength than in the first bonded portion, laterally outwardly adjacent to the first bonded portion and continuously extending along the entire length of the fastening tape in the longitudinal direction.

[2] The disposable diaper according to [1], wherein the first bonded portion is formed not only by adhesive adhesion, but also by the formation of a plurality of densified bundles by indentation, heat sealing or ultrasonic welding.

[3] A disposable diaper according to [1] or [2], wherein the side panel is a stretchable side panel.

[4] A disposable diaper according to any one of paragraphs. [1] - [3], while the fixing tape is attached only to the side of the side panel facing away from the skin.

[5] A disposable diaper according to any one of paragraphs. [1] - [4], while the second weakly coupled section is formed only by the formation of many compacted ligaments by indentation, heat welding or ultrasonic welding.

[6] The disposable diaper according to [5], wherein the second loosely coupled portion has a plurality of densified ligaments, as well as an unlinked region located between adjacent densified ligaments.

[7] The disposable diaper according to [5] or [6], wherein some of the plurality of sealed ligaments span the distal edge of the stretched side panel on both sides and extend laterally outward from the distal edge of the stretched side panel.

[8] A disposable diaper according to any one of paragraphs. [5] - [7], while one of the many densified ligaments, located laterally in the outermost place and closest to the crotch area, has an angle of inclination,

at the same time, when the fixing tape is stretched when fitting a disposable diaper to the user's body,

the angle of inclination essentially coincides with the angle of inclination of the first imaginary line connecting the intersection point located closer to the crotch area between the distal edge of the side panel and the lower edge of the mounting tape, and the intersection point located closer to the crotch area between the side edge of the absorbent assembly and the lower edge of the side panels.

[9] A disposable diaper according to any one of paragraphs. [3] - [8], wherein the stretchable side panel comprises a skin facing sheet located on the skin facing side of the stretch side panel, a skin facing sheet located on the skin side of the stretch side panel, and a plurality of elastic threads, fixed between the sheet facing the skin and the sheet facing away from the skin in its extended state in the lateral direction, while

the engaged portion overlaps a portion of the distal fixed end portion of the elastic thread.

[10] The disposable diaper according to [9], wherein the stretchable side panel is formed by positioning and securing a plurality of elastic threads between the sheet facing the skin and the sheet facing the skin, which are two sheets of a nonwoven fabric.

[11] The disposable diaper according to [9] or [10], wherein each of the elastic threads has a generally round, square or rectangular cross section.

[12] A disposable diaper according to any one of paragraphs. [9] - [11], wherein each of the elastic threads has a width or diameter of 0.1-2 mm, more preferably 0.1-1 mm.

[13] A disposable diaper according to any one of paragraphs. [9] - [12], wherein the number of elastic threads located in the stretch side panel is preferably from 1 to about 25, more preferably from 3 to 20.

[14] A disposable diaper according to any one of paragraphs. [9] - [13], wherein each of the elastic strands experiences a stress of 0.1-1 N at 100% elongation and is fixed at elongation of 50% -300%, more preferably at elongation of 100% -250%.

[15] A disposable diaper according to any one of paragraphs. [3] to [8], wherein the stretchable side panel is a composite sheet comprising a skin-facing sheet, a skin-facing sheet, and an elastomeric film or an elastomeric mesh located and secured between the skin-facing sheet and the skin-facing sheet while both the skin-facing sheet and the skin-facing sheet are a non-woven fabric sheet.

[16] The disposable diaper according to [15], wherein the stretchable side panel, the elastomeric film or elastomeric network of which is laid and fixed, is formed by positioning and securing an elastomeric network experiencing a voltage of 3-25 N / 25 mm width at 100% elongation and fixed at elongation of 50% -300%, more preferably 100% -250%.

[17] A disposable diaper according to any one of paragraphs. [9] - [14], wherein the side panel has adhesive layers for attaching a plurality of elastic threads between the sheet facing the skin and the sheet facing away from the skin, wherein

adhesive layers include a proximal adhesive layer where the proximal end of each elastic thread is fixed, a distal adhesive layer where the distal end of each elastic thread is fixed, and an intermediate adhesive layer located between the proximal adhesive layer and the distal adhesive layer where two sheets are fixed.

[18] The disposable diaper according to [17], wherein the intermediate adhesive layer comprises a plurality of intermediate adhesive layers spaced laterally and located in an intermediate region located between the proximal adhesive layer and the distal adhesive layer,

each intermediate adhesive layer is smaller in width than the proximal adhesive layer and the distal adhesive layer.

[19] The disposable diaper according to [17] or [18], wherein the proximal adhesive layer, the distal adhesive layer, and the intermediate adhesive layer extend along the entire length of the stretched side panel in the longitudinal direction transverse to each elastic thread.

[20] A disposable diaper according to any one of paragraphs. [3] - [19], while the side panel forms many folds on both sides when the elastic threads are in a relaxed unstretched state,

each of the folds extends longitudinally across a plurality of elastic threads,

the folds formed on the side panel are formed so that the sheet facing the skin and the sheet facing away from the skin bulge apart from the elastic threads in each non-adhesive area due to the reduction of the elastic threads and are concave towards the elastic threads, so that on the side panels form ridges and depressions.

[21] A disposable diaper according to any one of paragraphs. [3] - [20], wherein the length in the longitudinal direction of the stretch side panel having an adhered region where the stretch side panel and the fastener tape overlap exceeds the length of the fastener tape in the same direction in the same region.

[22] The disposable diaper according to [21], wherein the length in the longitudinal direction of the stretching side panel having an adhered region is 1.2-3.5 times, preferably 1.4-3.0 times, greater than the length of the fastening tape in the same direction in the same area.

[23] The disposable diaper according to [21] or [22], wherein the area in the plan view of the adhered area is 10% -50%, preferably 10% -40%, of the total area of the stretched side panel in its natural relaxed state .

[24] A disposable diaper according to any one of paragraphs. [1] - [23], while the shape of the individual densified ligaments is elongated annular, round, rhombic, triangular or polygonal.

[25] The disposable diaper according to [24], wherein the area of the individual sealed bundles is 2-30 mm ² , preferably 2-20 mm ² .

[26] The disposable diaper according to [24] or [25], wherein the distance between adjacent sealed bundles is 1-8 mm.

[27] A disposable diaper according to any one of paragraphs. [3] - [26], wherein the fastening tape fixed on the distal side portion of each stretchable side panel comprises a base sheet and a hook material having a plurality of engaging protrusions on the distal portion of the base sheet,

the mounting tape is folded back before use and unfolds when used,

the fixing tape is rectangular, longer in the lateral direction than in the longitudinal direction in its unfolded state, while

the fixing tape is formed by creating a base sheet having the same shape in a plan view as the fixing tape, and attaching the hook material to the distal portion of the base sheet.

[28] A disposable diaper according to any one of paragraphs. [1] - [27], having on the outside of the front portion a landing sheet to which the hook material of the fastening tape is to be attached.

[29] A disposable diaper according to any one of paragraphs. [1] - [28] having a side sheet on opposite side portions of the absorbent assembly located along the longitudinal direction by means of the top sheet.

[30] The disposable diaper according to [29], wherein the side sheet is attached to the skin side of the upper sheet so as to extend along the entire length of each side section in the longitudinal direction, has a free edge along its proximal edge and is provided near its free edges on the crotch area with an elastic link forming a leak-proof cuff,

the elastic cuff forming the cuff is fixed in a stretched state so as to cause the lateral sheet to be raised from the free edge at a predetermined width from the top sheet to form a leakproof cuff while shortening the elastic cuff forming the cuff while wearing the diaper,

the side sheet extends laterally outward from the side portion of the absorbent assembly and is connected to the back sheet to form a valve, wherein

the valve in the crotch section is provided with an elastic link forming assemblies around the legs, while the elastic link forming the assemblies around the legs is fixed in a stretched state along the longitudinal direction so as to form assemblies around the legs when the elastic link forming the assemblies around the legs is reduced during wearing the diaper.

[31] A disposable diaper according to any one of paragraphs. [1] to [30], wherein the distal lateral edge of the stretchable side panel has a length in the longitudinal direction greater than the length in the same direction of the fastening tape in the first engaged portion.

[32] A disposable diaper according to any one of paragraphs. [1] to [31], wherein the first bonded portion is formed by heat welding or ultrasonic welding in addition to adhesive adhesion.

[33] A disposable diaper according to any one of paragraphs. [1] to [33], wherein the first bonded portion has an fused bond, where the fastening tape and the stretchable side panel are fused to each other, as well as an area not fused to each other, where the fastener tape and the stretched side panel are not fused to each other friend.

[34] A disposable diaper according to any one of paragraphs. [1] - [33], while the first linked section has many groups of fused ligaments, each of which consists of small fused ligaments uniformly spaced in the longitudinal direction, while

many groups of fused ligaments are located in the lateral direction so that the fused ligaments of one group of fused ligaments and the fused ligaments of an adjacent group of fused ligaments are not aligned laterally.

[35] A disposable diaper according to any one of paragraphs. [1] to [34], wherein the first bonded portion is formed with an adhesive.

[36] A disposable diaper according to any one of paragraphs. [1] to [35], wherein the stretchable side panel comprises a skin-facing sheet located on the skin-facing side of the stretchable side panel, a skin-facing sheet located on the skin-side of the stretchable side panel, and a plurality of elastic links, fixed between the sheet facing the skin and the sheet facing away from the skin in its extended state in the lateral direction, while

the first interlocked portion overlaps a portion of the distal fixed end portion of the elastic link of the stretched side panel.

[37] A disposable diaper according to any one of paragraphs. [1] - [36], wherein the stretchable side panel is a composite sheet containing two sheets of nonwoven fabric, as well as an elastic link fixed between them in its stretched state, while the elastic link is an elastomeric film and an elastomeric mesh, this

the first interlocked portion overlaps a portion of the distal fixed end portion of the elastic link in the stretch side panel.

[38] A disposable diaper according to any one of paragraphs. [1] to [37], wherein the stretch side panel is formed by securing the plurality of elastic threads as an elastic link in its stretched state between the skin facing sheet located on the skin side of the stretching side panel and the skin facing sheet located on the skin-side of the stretch side panel, or

the stretchable side panel is formed by a composite sheet consisting of a sheet facing the skin, facing away from the skin of the sheet, and also, as an elastic link, an elastomeric film or an elastomeric mesh located and secured between the facing skin sheet and the facing skin sheet in its stretched state , wherein

the elongated segment of the sheet facing the skin from the lateral edge of the absorbent assembly is different from the elongated segment of the sheet facing the skin from the lateral edge of the absorbent assembly.

[39] A disposable diaper according to any one of paragraphs. [1] to [38], wherein the unengaged portion has a width in the lateral direction, with the width increasing toward both ends of the unengaged portion in the longitudinal direction.

[40] A disposable diaper according to any one of paragraphs. [1] - [39], wherein the unengaged portion is the narrowest in place above the center line of the fixing tape, extending in the longitudinal direction of the fixing tape.

[41] A disposable diaper according to any one of paragraphs. [1] to [40], wherein the top sheet and the outer composite sheet cover the entire area of the side of the absorbent unit respectively facing the skin and the side of the absorbent side of the skin, extend outward from the perimeter of the absorbent unit, and are attached to each other using an adhesive such as hot-melt adhesive, or by fusion bonding, for example by heat sealing, on its extensions outside the absorbent link.

[42] A disposable diaper according to any one of paragraphs. [1] to [41] having a side sheet on opposite side portions of the absorbent assembly located along the longitudinal direction by means of the top sheet.

[43] The disposable diaper according to [42], wherein the side sheet is attached to the skin side of the upper sheet to extend along the entire length of each side portion of the absorbent assembly in the longitudinal direction Y, has a free edge along its proximal edge and is provided near its free edge on the crotch section with an elastic link forming a leak-tight cuff, while an elastic link forming a leak-tight cuff is fixed in its stretched state in the longitudinal direction Y so that Oba lateral force on the sheet by a predetermined width from the rise of the free edge of the top sheet to form the leakage does not permit the cuff.

[44] The disposable diaper according to [42] or [43], wherein the side sheet extends laterally outward from the side portion of the absorbent assembly and is connected to a lateral extension of the outer composite sheet to form a valve.

[45] The disposable diaper according to [44], wherein the valve in the crotch portion is provided with an elastic link forming assemblies around the legs in its stretched state along the longitudinal direction so as to form assemblies around the legs while reducing the elastic link forming the assemblies around the legs, while wearing a diaper.

[46] A disposable diaper according to any one of paragraphs. [1] - [45], while the stretchable side panel has a rectangular or trapezoidal shape, or a shape with a curved edge in a flat configuration.

[47] A disposable diaper according to any one of paragraphs. [1] - [46], while the stretchable side panel has an elastic thread, while

the elastic thread has a width or diameter of 0.1-2 mm.

[48] The disposable diaper according to [47], wherein the stretchable side panel has an elastic thread, wherein

the number of elastic threads located in the stretchable side panel is from 1 to 25.

[49] A disposable diaper according to any one of paragraphs. [1] to [48], wherein the stretchable side panel comprises a skin facing sheet located on the skin facing side of the stretch side panel, a skin facing sheet located on the skin side of the stretch side panel, and a plurality of elastic threads, fixed between the sheet facing the skin and the sheet facing away from the skin in its extended state in the lateral direction,

elastic threads are fixed between the sheet facing the skin and the sheet facing away from the skin by a plurality of adhesive layers extending in the longitudinal direction transverse to the elastic threads,

the skin-facing sheet and the skin-facing sheet are directly adhered to each other by means of adhesive layers in areas where there are no elastic threads.

[50] The disposable diaper according to [49], wherein each of the plurality of adhesive layers extends along the entire length of the stretchable side panel in the longitudinal direction transverse to each elastic thread extending laterally.

[51] A disposable diaper according to [49] or [50], wherein fixing in a stretchable side panel is accomplished by combining adhesive adhesion and heat seal fusion bonding.

[52] A disposable diaper according to any one of paragraphs. [1] to [51], wherein the sheet of the stretchable side panel facing the skin has a continuation extending laterally outward from the distal fixed end portion of the plurality of elastic threads, wherein

the skin-facing sheet of the stretchable side panel has a continuation extending laterally outward from the distal fixed end portion of the plurality of elastic threads.

[53] A disposable diaper according to any one of paragraphs. [1] to [52], wherein the fixing tape comprises a base sheet and a hook material having a plurality of engaging protrusions in a distal portion of the base sheet, wherein

The mounting tape is folded back before use and unfolds when used.

[54] The disposable diaper according to [24], wherein the fastening tape is rectangular and longer in the lateral direction than in the longitudinal direction in its unfolded state,

the fixing tape is formed by creating a base sheet having the same shape in a plan view as the fixing tape, and attaching the hook material to the distal portion of the base sheet, wherein

the diaper has on the outside of the front portion a landing sheet to which the hook material of the fastening tape must be attached.

[55] A disposable diaper according to any one of paragraphs. [1] - [54], wherein the fastening tape is attached only to the side of the stretching side panel facing away from the skin.

[56] A disposable diaper according to any one of paragraphs. [1] to [55], wherein the stretchable side panel comprises a sheet facing away from the skin and an elastic link,

the sheet facing away from the skin has a continuation laterally outside the distal fixed end portion of the elastic link, while

the fastening tape is attached at its proximal portion only to the skin-facing side of only the continuation of the skin-facing sheet.

[57] The disposable diaper according to [33], wherein the fused ligament comprises first oblong fused ligaments tilted at an angle with respect to the longitudinal direction, as well as second elongated fused ligaments tilted so as to face opposite to the first elongated fused ligaments.

[58] A disposable diaper according to [33] or [28], wherein the shape of the fused bundle is elongated annular, round, rhombic, triangular or polygonal.

[59] The disposable diaper according to [33], [57] or [58], wherein the area of the fused bundle is 2-30 mm ² .

[60] A disposable diaper according to any one of paragraphs. [1] to [59], wherein the length in the longitudinal direction of the stretch side panel having an overlap region where the stretch side panel and the fastener tape overlap is 1.2-3.5 times the length in the longitudinal direction of the fastener tape in the overlap region .

[61] The disposable diaper according to [60], wherein the area in the plan view of the overlapping region is 10% -50% of the total area of the stretchable side panel in the natural relaxed state of the stretchable side panel.

[62] The disposable diaper according to [60] or [61], wherein the area of the first interlocked portion is 40% -90% of the area of the overlap area.

[63] The disposable diaper according to any one of paragraphs. [60] - [62], while the area of the unlinked portion is 10% -50% of the area of the overlap area.

[64] The disposable diaper according to [33], wherein the fused ligament consists of elongated first fused ligaments having an angle of inclination relative to the longitudinal direction, wherein

the first linked section has two groups of first fused ligaments, each of which consists of spatially spaced first fused ligaments in the longitudinal direction, while two groups of first fused ligaments are located in the lateral direction, while

each space between adjacent fused ligaments forms an area not linked by fusion.

[65] The disposable diaper according to [33], wherein the fused ligament consists of elongated third fused ligaments extending laterally parallel to each other,

the first linked portion has two groups of third fused ligaments, each of which consists of third fused ligaments spatially spaced in the longitudinal direction along a line that is convex laterally outward, while two groups of third fused ligaments are located in the lateral direction,

the first concatenated portion is convex laterally outward, while its most lateral-outward point lies on the axial line of the fixing tape, continuing in the longitudinal direction of the fixing tape,

the unlinked portion has a concavity in the lateral-outer direction,

the width of the unengaged portion in the lateral direction gradually increases from the middle located on the axial line of the fixing tape, both up and down from the axial line, while

the unengaged portion is continuous in the longitudinal direction, while the width of the unengaged portion increases in the direction of both of its longitudinal ends.

[66] The disposable diaper according to [1] or [31], wherein the fastening tape and the stretchable side panel are adhered to each other only by adhesive,

the first bonded portion has an adhesive bonded region, where the fastening tape and the stretchable side panel are bonded with adhesive, while the adhesive bonded region continuously extends in the longitudinal direction over the entire length of the mounting tape in the longitudinal direction,

the first interlocked portion protrudes laterally outward, while its outermost point is located on the axial line of the fixing tape, continuing in the longitudinal direction of the fixing tape,

the proximal edge of the unlinked portion forms a recess in the laterally-outer direction,

the unengaged portion has a width in the lateral direction, gradually increasing from its middle, located on the axial line of the fixing tape, both up and down from the axial line, while

the unengaged portion is continuous in the longitudinal direction, while the width of the unengaged portion increases in the direction of both of its longitudinal ends.

[67] A disposable diaper according to any one of [1] or [31], wherein the fastening tape and the stretchable side panel are adhered only by adhesive,

the first bonded portion has an adhesive bonded region, where the fastening tape and the stretchable side panel are bonded with adhesive, while the adhesive bonded region continuously extends in the longitudinal direction over the entire length of the mounting tape in the longitudinal direction,

the first interlocked portion protrudes laterally outward, while its outermost point is located above the axial line of the mounting tape, continuing in the longitudinal direction of the fixing tape,

the proximal edge of the unengaged portion forms a recess in the laterally-outer direction, while the deepest point of the unengaged portion is located above the center line of the fixing tape, while the width of the unengaged portion in the lateral direction gradually increases both up and down from the deepest point, while

the unengaged portion is continuous in the longitudinal direction and as narrow as possible in place above the axial line of the fixing tape.

[68] A disposable diaper according to any one of paragraphs. [1] to [67], wherein the adhesion strength of the second weakly bonded portion is 5% -70%, preferably 20% -50%, of the adhesion strength of the first bonded portion.

[69] A disposable diaper according to any one of paragraphs. [1] to [68], wherein the area of the unlinked portion is 10% -50%, preferably 15% -40%, of the area of the overlap area where the stretch side panel and the fastening tape overlap.

INDUSTRIAL APPLICABILITY

In the invention (the first aspect), a disposable diaper is proposed, in which the substrate is less likely to break between the fastening tape and the side panel when fitting the diaper to the user's body, and therefore can provide enhanced usability.

The invention also provides a disposable diaper having the premise that each stretchable side panel will rotate to its side facing the skin, thereby improving usability.

Claims (94)

1. A disposable diaper comprising an elongated absorbent assembly having a liquid-retaining absorbent unit, a top sheet located on the skin side of the absorbent unit, and a back sheet located on the skin side of the absorbent unit, wherein the absorbent unit is divided into the front portion configured to be worn from the side of the user's abdomen, a rear section made to be worn from the side of the user's back, and also a crotch section located between the front portion and the rear portion, wherein the diaper has a longitudinal direction coinciding with the longitudinal direction of the absorbent assembly, as well as a lateral direction perpendicular to the longitudinal direction, the diaper further comprises a stretchable side panel attached to both portions of the sides of one longitudinal end portion of the absorbent assembly and extending outward in a lateral direction, as well as a fastening tape attached to a distal side portion of each stretchable side panel and extending outward in a lateral direction, the fixing tape is adhered to the skin-facing side of the stretchable side panel, the fastening tape is adhered by the first interlocked portion, where the fastening tape and the stretchable side panel are adhered to each other by adhesive adhesion using an adhesive, wherein the first interlocked portion is laterally inward from the distal side edge of the stretchable side panel, wherein an unengaged portion or a second weakly bonded portion is formed between the first bonded portion and the distal lateral edge of the stretched side panel, wherein an unengaged portion is a portion where the fastening tape and the stretchable side panel are not engaged with each other, extending along the entire length of the mounting tape in the longitudinal direction, while the second loosely coupled portion is a portion where the fastening tape and the stretchable side panel are bonded to each other with lower adhesion strength than in the first bonded portion, laterally outwardly adjacent to the first bonded portion and continuously extending along the entire length of the fastening tape in the longitudinal direction. 2. The disposable diaper according to claim 1, wherein the first bonded portion is formed not only by adhesive adhesion, but also by the formation of a plurality of densified bundles by indentation, heat welding or ultrasonic welding. 3. The disposable diaper according to claim 1, wherein the second loosely coupled portion is formed only by forming a plurality of densified bundles by indentation, heat welding or ultrasonic welding. 4. The disposable diaper according to claim 3, wherein the second loosely coupled portion has a plurality of sealed ligaments, as well as an unlinked region located between adjacent sealed ligaments. 5. The disposable diaper according to claim 3, wherein some of the plurality of densified ligaments encompass the distal edge of the stretch side panel and extend laterally outward from the distal edge of the stretch side panel. 6. The disposable diaper of claim 3, wherein one of the plurality of sealed ligaments located laterally in the outermost place and closest to the crotch portion has an angle of inclination, at the same time, when the tape is stretched when fitting a disposable diaper to the user's body, the angle of inclination essentially coincides with the angle of inclination of the first imaginary line connecting the intersection point located closer to the crotch area between the distal edge of the side panel and the lower edge of the mounting tape, and the intersection point located closer to the crotch area between the side edge of the absorbent assembly and the lower edge of the side panels. 7. The disposable diaper according to claim 1, wherein the side panel is a stretchable side panel, the stretch side panel comprises a skin facing sheet located on the skin side of the stretch side panel, a skin facing sheet located on the skin side of the stretch side panel, and a plurality of elastic threads fixed between the skin facing sheet and the skin facing sheet in its extended state in the lateral direction, while the engaged portion overlaps a portion of the distal fixed end portion of the elastic thread. 8. The disposable diaper according to claim 7, wherein the stretchable side panel is formed by positioning and securing a plurality of elastic threads between the sheet facing the skin and the sheet facing away from the skin, which are two sheets of a nonwoven fabric. 9. The disposable diaper according to claim 7, wherein each of the elastic threads has a generally round, square or rectangular cross section. 10. The disposable diaper according to claim 7, wherein each of the elastic threads has a width or diameter of 0.1-2 mm. 11. The disposable diaper according to claim 7, wherein the number of elastic threads located in the stretchable side panel is from 1 to 25. 12. The disposable diaper according to claim 7, wherein each of the elastic strands experiences a stress of 0.1-1 N at 100% elongation and is fixed at elongation of 50% -300%. 13. The disposable diaper according to claim 1, wherein the side panel is a stretchable side panel, the stretchable side panel is a composite sheet comprising a skin-facing sheet, a skin-facing sheet, and an elastomeric film or an elastomeric mesh located and secured between the skin-facing sheet and the skin-facing sheet, while both the skin-facing sheet and and the skin-facing sheet is a non-woven fabric sheet. 14. The disposable diaper according to claim 13, wherein it is stretchable the side panel, the elastomeric film or the elastomeric mesh of which is laid and fixed, is formed by positioning and fixing the elastomeric mesh, experiencing a voltage of 3-25 N / 25 mm-width at 100% elongation and fixed at elongation of 50% -300%. 15. The disposable diaper according to claim 7, wherein the side panel has adhesive layers for attaching a plurality of elastic threads between the sheet facing the skin and the sheet facing away from the skin, wherein adhesive layers include a proximal adhesive layer where the proximal end of each elastic thread is fixed, a distal adhesive layer where the distal end of each elastic thread is fixed, and an intermediate adhesive layer located between the proximal adhesive layer and the distal adhesive layer where two sheets are fixed. 16. The disposable diaper according to claim 15, wherein the intermediate adhesive layer comprises a plurality of intermediate adhesive layers spaced laterally and located in an intermediate region located between the proximal adhesive layer and the distal adhesive layer, each intermediate adhesive layer is smaller in width than the proximal adhesive layer and the distal adhesive layer. 17. The disposable diaper according to claim 15, wherein the proximal adhesive layer, the distal adhesive layer, and the intermediate adhesive layer extend along the entire length of the stretched side panel in the longitudinal direction across each elastic thread. 18. The disposable diaper according to claim 1, wherein the side panel is a stretchable side panel, the side panel forms many folds on both sides when the elastic threads are in a relaxed unstretched state, each of the folds extends longitudinally across a plurality of elastic threads, the folds formed on the side panel are formed so that the sheet facing the skin and the sheet facing away from the skin bulge apart from the elastic yarns in each area that is not adherently adhered due to the reduction of the elastic yarns and are concave in the direction of the elastic yarns so that ridges and depressions form on the side panel. 19. The disposable diaper according to claim 1, wherein the side panel is a stretchable side panel, the length in the longitudinal direction of the stretch side panel having an adhered region where the stretch side panel and the fastener tape overlap exceeds the length of the fastener tape in the same direction in the same region. 20. The disposable diaper according to claim 19, wherein the length in the longitudinal direction of the stretchable side panel in the adhered area is 1.2-3.5 times the length of the fastening tape in the same direction in the same area. 21. The disposable diaper according to claim 19, wherein the area in the plan view of the bonded area is 10% -50% of the total area of the stretched side panel in its natural relaxed state. 22. The disposable diaper according to claim 1, wherein the side panel is a stretchable side panel, a fastening tape fixed on the distal side portion of each stretchable side panel comprises a base sheet and a hook material having a plurality of engaging protrusions on the distal portion of the base sheet, the mounting tape is folded back before use and unfolds when used, the fixing tape is rectangular, longer in the lateral direction than in the longitudinal direction in its unfolded state, while the fixing tape is formed by creating a base sheet having the same shape in a plan view as the fixing tape, and attaching the hook material to the distal portion of the base sheet. 23. The disposable diaper according to claim 1, having a side sheet on opposite side portions of the absorbent assembly, located along the longitudinal direction through the upper sheet. 24. The disposable diaper according to claim 23, wherein the side sheet is attached to the skin side of the top sheet so as to extend along the entire length of each side section in the longitudinal direction, has a free edge along its proximal edge and is provided near its free edge on the crotch a section with an elastic link forming a leakproof cuff, the elastic cuff forming the cuff is fixed in a stretched state so as to cause the lateral sheet to be raised from the free edge at a predetermined width from the top sheet to form a leakproof cuff while shortening the elastic cuff forming the cuff while wearing the diaper, moreover, the side sheet extends laterally outward from the side portion of the absorbent assembly and is connected to the back sheet to form a valve, wherein the valve in the crotch section is provided with an elastic link forming assemblies around the legs, while the elastic link forming the assemblies around the legs is fixed in a stretched state along the longitudinal direction so as to form assemblies around the legs when the elastic link forming the assemblies around the legs is reduced during wearing the diaper. 25. The disposable diaper according to claim 1, wherein the distal lateral edge of the stretchable side panel has a length in the longitudinal direction exceeding the length in the same direction of the fastening tape in the first engaged portion. 26. The disposable diaper according to claim 1, wherein the first bonded portion is formed by heat welding or ultrasonic welding in addition to adhesive adhesion. 27. The disposable diaper according to claim 1, wherein the first bonded portion has a fused bundle where the fastening tape and the stretchable side panel are fused to each other, as well as an area not fused to each other, where the fastener tape and the stretchable side panel are not fused to each other with a friend. 28. The disposable diaper according to claim 1, wherein the first the linked section has many groups of fused ligaments, each of which consists of small fused ligaments uniformly spaced in the longitudinal direction, while many groups of fused ligaments are arranged laterally so that the fused ligaments of one group of fused ligaments and the fused ligaments of an adjacent group of fused ligaments are not laterally aligned with each other. 29. The disposable diaper according to claim 1, wherein the stretchable side panel comprises a skin-facing sheet located on a skin-facing side of a stretchable side panel, a skin-facing sheet located on a skin-facing side of a stretchable side panel, and a plurality of elastic links fixed between the sheet facing the skin and the sheet facing away from the skin in its extended state in the lateral direction, wherein the first interlocked portion overlaps a portion of the distal fixed end portion of the elastic link of the stretched side panel. 30. The disposable diaper according to claim 1, wherein the unengaged portion has a width in the lateral direction, while the width increases toward both ends of the unengaged portion in the longitudinal direction. 31. The disposable diaper according to claim 1, wherein the unhooked portion is the narrowest in place above the axial line of the fastening tape, extending in the longitudinal direction of the fastening tape. 32. The disposable diaper according to claim 1, wherein the top sheet and the outer composite sheet cover the entire area of the skin side of the absorbent side and the side of the absorbent link facing the skin, extend outward from the perimeter of the absorbent link, and are attached to each other using an adhesive such as hot-melt adhesive, or by fusion bonding, for example by heat sealing, on its extensions outside the absorbent link. 33. The disposable diaper according to claim 1, wherein the stretchable side panel comprises a sheet facing the skin located on a skin-facing side of the stretch side panel, a skin-facing sheet located on a skin-side of the stretch side panel, and a plurality of elastic threads fixed between the skin-facing sheet and the skin-facing sheet in its laterally stretched state, elastic threads are fixed between the sheet facing the skin and the sheet facing away from the skin by a plurality of adhesive layers extending in the longitudinal direction transverse to the elastic threads, the skin-facing sheet and the skin-facing sheet are directly adhered to each other by means of adhesive layers in areas where there are no elastic threads. 34. The disposable diaper according to claim 33, wherein each of the plurality of adhesive layers extends along the entire length of the stretchable side panel in a longitudinal direction transverse to each elastic thread extending laterally. 35. The disposable diaper according to claim 33, wherein the fastening in the stretchable side panel is accomplished by combining adhesive adhesion and heat-sealing by fusion. 36. The disposable diaper according to claim 1, wherein the sheet of the stretchable side panel facing the skin has a continuation extending laterally outward from the distal fixed end portion of the plurality of elastic threads, the skin-facing sheet of the stretchable side panel has a continuation extending laterally outward from the distal fixed end portion of the plurality of elastic threads. 37. The disposable diaper according to claim 27, wherein the fused ligament consists of oblong first fused ligaments having an angle of inclination, wherein the first linked section has two groups of first fused ligaments, each of which consists of spatially spaced first fused ligaments in the longitudinal direction, while two groups of first fused ligaments are located in the lateral direction, while each space between adjacent fused ligaments forms an area not linked by fusion. 38. The disposable diaper according to claim 27, wherein the fused ligament consists of oblong third fused ligaments extending laterally parallel to each other, the first linked portion has two groups of third fused ligaments, each of which consists of third fused ligaments spatially spaced in the longitudinal direction along a line that is convex laterally outward, while two groups of third fused ligaments are located in the lateral direction, the first concatenated portion is convex laterally outward, while its most lateral-outward point lies on the axial line of the fixing tape, continuing in the longitudinal direction of the fixing tape, the unlinked portion has a concavity in the laterally-outer direction, the width of the unengaged portion in the lateral direction gradually increases from the middle located on the axial line of the fixing tape, both up and down from the axial line, while the unengaged portion is continuous in the longitudinal direction, while the width of the unengaged portion increases in the direction of both of its longitudinal ends. 39. The disposable diaper according to claim 1 or 25, wherein the fastening tape and the stretchable side panel are adhered to each other only with adhesive, the first bonded portion has an adhesive bonded region, where the fastening tape and the stretchable side panel are bonded with adhesive, while the adhesive bonded region continuously extends in the longitudinal direction over the entire length of the mounting tape in the longitudinal direction, the first interlocked portion protrudes laterally outward, while its outermost point is located on the axial line of the fixing tape, continuing in the longitudinal direction of the fixing tape, the proximal edge of the unlinked portion forms a recess in the laterally-outer direction, the unengaged portion has a width in the lateral direction, gradually increasing from its middle, located on the axial line of the mounting tape both up and down from the axial line, while the unengaged portion is continuous in the longitudinal direction, while the width of the unengaged portion increases in the direction of both of its longitudinal ends. 40. The disposable diaper according to claim 1 or 25, wherein the fastening tape and the stretchable side panel are adhered only by adhesive, the first bonded portion has an adhesive bonded region, where the fastening tape and the stretchable side panel are bonded with adhesive, while the adhesive bonded region continuously extends in the longitudinal direction over the entire length of the mounting tape in the longitudinal direction, the first interlocked portion protrudes laterally outward, while its outermost point is located above the axial line of the mounting tape, continuing in the longitudinal direction of the fixing tape, the proximal edge of the unengaged portion forms a recess in the laterally-outer direction, while the deepest point of the unengaged portion is located above the center line of the fixing tape, while the width of the unengaged portion in the lateral direction gradually increases both up and down from the deepest point, while the unengaged portion is continuous in the longitudinal direction and as narrow as possible in place above the axial line of the fixing tape. 41. The disposable diaper according to claim 1, wherein the adhesion strength of the second weakly coupled portion is 5% -70% of the adhesion strength of the first bonded portion. 42. The disposable diaper according to claim 1, wherein the area of the unlinked portion is 10% -50% of the area of the overlap area where the stretchable side panel and the fastening tape overlap.

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