RU2647603C2 - Disposable diaper - Google Patents

Abstract

FIELD: personal usage items.

SUBSTANCE: diaper (1A) is provided with an absorbent main unit (2) having an absorber (23), and elastic side panels (3) attached to both side portions (2S) of absorbent main unit (2). Absorbent main unit (2) has side sheets (24) disposed on both side portions (2S) thereof. Side panels (3) are formed so as to fix elastic members (33), which are in a state of being elongated in the X-direction, between two side panel sheets (31 and 32) by way of a main unit-side adhesive layer (35) and an outer-side adhesive layer (36). On side panels (3), in a natural state, by way of contractive force of the elastic members (33), between the main unit-side adhesive layer (35) and the outer-side adhesive layer (36), a gathering area (GT) is formed, comprising hollow gathers in which the respective elastic member (33) is not fixed by the side panel sheets (31 and 32).

EFFECT: in this diaper (1A), outer-side edge portions (2S1), along the Y-direction of the absorbent main unit (2) are upon the gathering areas (GT) of the side panels (3).

20 cl, 11 dwg

Description

FIELD OF THE INVENTION

The present invention relates to a disposable type diaper.

State of the art

The patent holder, the same as the owner of this patent application, previously proposed a disposable diaper of the open type with a tape having an absorbent kit containing an absorbent element, and two side panels that lend themselves to lateral stretching and which are attached one on each side the lower part of the absorbent kit in order to reduce the amount of materials used for the manufacture of side panels and waste materials to achieve environmental and economic benefits (see below the specified patent literature 1).

The disposable diaper of Patent Literature 1 has a fastening tape attached to an edge of each side panel distal in the width direction. The fastening tape has an attached part in which it is attached to the lap side panel. In the part of the side panel that is adjacent to the lower end of the attached part, there are many folds formed by pulling together the elastic part. With this configuration, a disposable diaper is less likely to undergo elongation, tearing, delamination, and the like in the region of its fastening tapes.

List of links

Patent Literature

Patent Literature 1: WO2012073901 (A1)

Summary of the invention

Technical problem

Since a disposable diaper of the type described is worn on the wearer by stretching the stretchable side panels, a relatively high pressure when worn will act on the wearer's body from both sides of the absorbent assembly in which the stretchable side panel is attached. In particular, the stretchable side panel, which consists of two sheets and elastic elements fixed between them when the elastic elements are stretched, has an increased amount of adhesive applied to both ends of each elastic element to firmly attach the stretchable and contractile elastic elements. This can lead to imperfections, such as a feeling of greater stiffness compared to other parts and stickiness. Consequently, the area of the side panel in which the proximal adhesive layer is formed may leave a red mark on the skin of the carrier, or the sheet of the side panel may adhere to the skin of the carrier depending on the relative position of the side sheet that is located along each side of the absorbent assembly and the stretch side panels.

Patent Literature 1 does not mention the mutual arrangement of the side sheet and the stretchable side panel attached to each side of the absorbent assembly, in connection with the prevention of the disadvantages discussed above arising in the area of the side panel having a proximal adhesive layer. Thus, the disposable diaper according to the patent literature 1 allows the possibility of further increasing comfort for the wearer.

Solution

In accordance with the invention, there is provided a disposable diaper comprising an elongated absorbent kit and a stretchable side panel attached to both sides of the absorbent kit, the absorbent kit including a top sheet located on the side of its surface facing the skin, a bottom sheet located on the side of its surface not facing the skin, and an absorbent element located between the upper sheet and the lower sheet. The fastening tape is laterally attached to the distal end portion of the side panel, and the fastening tape has an attachment member adapted to be attached to the skin side of the absorbent assembly. The absorbent kit further comprises a side sheet located along its both side parts. The side panel contains: two sheets of the side panel; a plurality of elastic elements which are fixed in their stretched state between two sheets of the side panel and which extend along the lateral direction of the absorbent assembly; a proximal adhesive layer that extends in the longitudinal direction of the absorbent assembly and in which a proximal end portion of each of the elastic elements is fixed, and a distal adhesive layer that extends in the longitudinal direction of the absorbent assembly and in which a distal end portion of each of the elastic elements is fixed, while the lateral the panel is formed by fixing elastic elements in their stretched state between two sheets of the side panel by means of a proximal adhesive layer and distal adhesive layer. The side panel is configured so that it has a zone assembled in the assembly between the proximal adhesive layer and the distal adhesive layer in its contracted state of relaxation due to the pulling force created by the elastic elements, while the zone assembled in the assembly has hollow folds, in which the elastic elements are not attached to the sheets of the side panel. The side panel further comprises a plurality of intermediate fixing parts that extend in the longitudinal direction of the absorbent assembly, which are located between the proximal adhesive layer and the distal adhesive layer and in which two sheets of the side panel are attached to each other. Each of the folds is formed between adjacent laterally, intermediate locking parts and runs across many elastic elements. The absorbent kit has, in its plan view, its each lateral edge portion located on the side panel region assembled in the assembly.

Preferred Effects of the Invention

In accordance with the invention, a disposable diaper is provided in which the unpleasant sensation created by the overlap between the absorbent set and the side panel due to the folding of the absorbent set inward or the height difference is eliminated, thereby providing increased comfort for the wearer.

Brief Description of the Drawings

[Fig. 1] Fig. 1 is a detailed plan view of a disposable diaper according to a first embodiment of the invention in its stretched configuration when viewed from the side of the top sheet.

[Fig. 2] Fig. 2 is an enlarged plan view of the side panel of the disposable diaper shown in Fig. 1 located on the right side, and the zones near it in their extended state.

[Fig. 3] Fig. 3 is a cross section of a first embodiment of a disposable diaper with the side panel shown in Fig. 2 in a folded state.

[Fig. 4] Fig. 4 (a) is a cross section of a side panel shown in Fig. 3 in its expanded state, and Fig. 4 (b) is a cross section of a side panel shown in Fig. 3, in her constricted state.

[Fig. 5] Fig. 5 is a perspective view of a manufacturing method of a side panel of a disposable diaper according to the first embodiment.

[Fig. 6] Fig. 6 is an enlarged plan view of a side panel of a disposable diaper in accordance with a second embodiment of the invention and the region in the vicinity thereof in their extended state.

[Fig. 7] Fig. 7 is a cross-sectional view of the disposable diaper of the second embodiment shown in Fig. 6 with the side panel pulled together (equivalent to Fig. 3).

[Fig. 8] Fig. 8 is a cross-sectional view of a disposable diaper according to a third embodiment with its side panel in a contracted state (equivalent to Fig. 3).

[Fig. 9] Fig. 9 is a cross-sectional view of a disposable diaper according to a fourth embodiment with its side panel in a contracted state (equivalent to Fig. 3).

[Fig. 10] Fig. 10 is a cross-sectional view of a disposable diaper according to a fifth embodiment with its side panel in a contracted state (equivalent to Fig. 3).

Description of Embodiments

The present invention relates to a disposable diaper that provides enhanced comfort for a wearer.

The invention will be described on the basis of a first preferred embodiment with reference to the accompanying drawings.

The disposable diaper 1A in accordance with the first embodiment of the invention (hereinafter referred to simply as the diaper 1A) includes, as illustrated in FIG. 1, an elongated absorbent assembly 2 and a stretchable side panel 3 attached to both side portions 2S, 2S of the absorbent assembly 2. The absorbent kit 2 includes an upper sheet 21 located on the side of its surface facing the skin, a lower sheet 22 located on the side of its surface not facing the skin, and absorbent lement 23 positioned between the topsheet 21 and the backsheet 22. The fastening tape 4 is attached to the distal laterally end portion 3a of the side panel. The fastening tape 4 has an attachment member 41 adapted to be fixed to the surface of the absorbent assembly 2 not facing the skin.

As illustrated in FIG. 1, the diaper 1A is bilaterally symmetrical with respect to the longitudinal center line CL of the absorbent assembly 2. While the structure of the side panels 3, the position of the side sheet 24 with respect to the side panel 3, and the method of attaching these elements and the absorbent assembly 2 are different to a friend will be limited to the left side of FIG. 1, the same is valid for the right side, except that the right and left sides are opposite.

The diaper 1A will be described in more detail. As shown in FIG. 1, the absorbent kit 2 of the diaper 1A has an elongated rectangular shape and is divided into a front portion A placed on the front side of the carrier in use, a rear portion B placed on the rear side of the carrier in use, and a crotch portion C located at perineal media when used.

The diaper 1A has a longitudinal direction extending from the front portion A through the crotch portion C to the rear portion B, which coincides with the longitudinal direction of the absorbent assembly 2, that is, the Y direction shown in the drawings. The diaper 1A has a lateral direction coinciding with the lateral direction of the absorbent assembly 2, that is, the X direction shown in the drawings, which is perpendicular to the Y direction. In the following description, the longitudinal direction of the absorbent assembly or the direction of the diaper forming member that coincides with the longitudinal direction of the absorbent assembly will also be called simply the Y direction, and the lateral direction of the absorbent kit or the direction of the diaper forming element that coincides with the side vym direction of the absorbent kit will also be called simply direction X. As used herein, the term "facing the skin surface" or "inner side" refers to a member of the diaper or forming the diaper which faces the skin of the wearer during wear. The term “non-skin surface” or “outer side” refers to the side of a diaper or diaper forming member that faces away from the skin of the wearer while wearing.

Absorbent kit 2 will be described in detail. As illustrated in FIGS. 1 and 3, the absorbent assembly 2 has a liquid permeable top sheet 21 that is liquid impermeable or low permeable to liquids (including water repellent), a lower sheet 22 and a liquid retainer, an absorbent element 23 located between the upper sheet 21 and the bottom sheet 22. As illustrated in figure 1, the top sheet 21 and the bottom sheet 22 cover the entire area respectively of the surface facing the skin and not facing the skin of the surface of the absorbent element 23, protrude outward from the periphery of the absorbed ayuschego element 23 and are attached to each other in their protruding portions by an adhesive such as hot melt adhesive or by fusion bonding, such as heat sealing. The top sheet 21 has the same length as the bottom sheet 22 in the longitudinal direction (Y direction) and is shorter than the bottom sheet 22 in the lateral direction (X direction), as shown in FIG. The bottom sheet 22 has the same shape in plan view as the absorbent assembly 2. As illustrated in FIG. 3, the bottom sheet 22 is a composite sheet consisting of a liquid impermeable or low permeable (including water repellent) sheet 22a non-permeability and outer non-woven sheet 22b attached to the non-skin side surface of the non-permeable sheet 22a by the outer adhesive layer 61. The outer non-woven sheet 22b has the same shape the shape in the plan view, as an absorbent set 2. The leak-proof sheet 22a has the same shape in the plan view as the outer sheet 22b of the nonwoven fabric, except that it is slightly narrower than the outer sheet 22b of the nonwoven fabric , in the X direction, as shown in FIG.

The absorbent assembly 2 has a side sheet 24 located in its each side part 2S, 2S along the Y direction. As illustrated in FIGS. 1 and 3, the side sheet 24 is provided with its fixation on the skin-facing surface of the top sheet 21 by the fixing part 27 extending in the longitudinal direction (Y direction) and the side sheet 24 covers the entire area of the side portion 2S over its entire length in the Y direction. As shown in FIG. 3, the fixing portion 27 in the diaper 1A is formed so that it extends over the entire length absorbent set 2, by applying adhesive to the inner side (side P shown in FIG. 3) of that part of the bottom sheet 22 that projects laterally outward from the top sheet 21, and to the inside (side P of FIG. 3) described in further, the side panel 3 by any known method or by connecting these elements by fusion in any known manner. The laterally proximal edge (located closer to the longitudinal center line CL than the other edge) of the side sheet 24 is a free edge. A portion of the side sheet 24 that projects laterally outward from the fixing portion 27 is attached to the bottom sheet 22 to form a valve in the side portion 2S of the absorbent assembly 2 along the Y direction.

As illustrated in FIG. 3, the side sheet 24 is formed of one liquid-tight sheet, the opposite side parts 24I and 24O of the side sheet are bent toward the sides of their non-skin surfaces along the longitudinal direction, so that the side sheet 24 has a two-layer structure. In particular, the laterally proximal (located closer to the longitudinal centerline CL), the side portion 24I is bent to the side of the non-skin surface (the outer side, the Q side indicated in FIG. 3) of the sheet to the location of the fixing portion 27. A lot elastic elements 25, intended to form a cuff that prevents leakage, are attached in a state in which they are stretched in the longitudinal direction (Y direction), to the area near the top of the fold between the folded sheets in the crotch part C. in the lateral direction, the edge part 24O is bent on the side not facing the skin (the outer side, the Q side in FIG. 3) of the sheet to the location of the fixing part 27. A plurality of elastic elements 26 for forming leg assemblies are attached in a state in which they are stretched in the longitudinal direction (Y direction), to the area near the crease between the folded sheets in the crotch part C. Two layers of the doubled side sheet 24 in zones other than the zone having elastic members 25 for forming Ia cuff, eliminating leakage, and the area having the elastic members 26 intended to form the leg assemblies are connected together at discrete locations (not shown) of the compound formed by fusing. Fusion joints (not shown) are formed, for example, by heat welding, ultrasonic welding, high frequency welding, or a combination of these methods.

In the side sheet 24 formed as described above, the laterally proximal side (the side closer to the center line CL than the fixing part 27) of the side sheet 24 forms a cuff preventing leakage in the crotch part C when the elastic elements 25 are pulled together designed to form a cuff that prevents leakage while wearing. In particular, the tip edge of the side sheet 24, which is closer to the center line CL than the fixing part 27, rises from the top sheet 21 in the crotch part C to form a cuff that prevents leakage. At the same time, the side distally in the lateral direction (the side farther from the center line CL than the fixing part 27) forms leg assemblies due to the pulling force created by the elastic elements 26 for forming leg assemblies.

As illustrated in FIG. 1, the side panels 3, 3 of the diaper 1A are attached to the absorbent assembly 2 so that they protrude laterally from the side portions 2S, 2S of the absorbent assembly 2 in the rear portion B. A fastening tape 4 having an attachment member 41 mounted on the distal end portion 3a of the side panel 3 so that it protrudes from the distal end portion 3a. Thus, the diaper 1A is a diaper of the disclosed type with two attached side panels 3 and 3 with ribbons.

The fastening of the side panel 3 to the absorbent assembly 2 will be described in detail. The side panel 3 is attached at its laterally proximal end part 3d to the absorbent assembly 2 so that it is located between the side sheet 24 and the bottom sheet 22, that is, between the side of the surface of the side sheet 24 not facing the skin and the side facing the skin bottom sheet surface 22.

As illustrated in FIGS. 2 and 3, the side panel 3, 3 includes: two sheets 31 and 32 (sheets of the side panel); a plurality of elastic elements 33 that are secured between two sheets 31 and 32 and which extend in the X direction; a proximal adhesive layer 35 that extends in the Y direction and in which the proximal end of each elastic element 33 is fixed, and a distal adhesive layer 36 that extends in the Y direction and in which the distal end of each elastic element 33 is fixed in the distal end portion 3a of the side panel 3 The side panel 3 is formed by fixing the elastic elements 33 in their extended state between the two sheets 31 and 32 by means of the proximal adhesive layer 35 and the distal adhesive layer 36. In particular As illustrated in Figure 2, side panel 3 of the diaper 1A is rectangular in planar unfolded configuration. As illustrated in FIGS. 4 (a) and 4 (b), the side panel 3 is formed by placing a plurality of elastic elements 33 in their state in which they are stretched in the X direction between two rectangular sheets 31 and 32 of non-woven material to ensure elastic elements 33. The stretched elastic elements 33 are arranged at equal intervals in the Y direction.

As illustrated in FIGS. 4 (a) and 4 (b), the side panel 3 includes: two sheets 31 and 32, elastic elements 33, a proximal adhesive layer 35 that secures the proximal end of each elastic element 33, a distal adhesive layer 36, which secures the distal end of each elastic member 33 in the distal end portion 3a of the side panel, and, in addition, a plurality of intermediate retaining parts 37 that extend in the Y direction, which allow two sheets 31 and 32 to be bonded to each other and which are arranged between the proximal adhesive layer 35 and adhesive layer 36. The distal end portion of the distal side 3a of the panel 3 is an end portion opposite to the proximal end portion 3d, situated on the part 2 of the absorbent kit.

The intermediate fixing portion 37 in the diaper 1A is an adhesive layer. The proximal adhesive layer 35, the distal adhesive layer 36, and the intermediate fixing parts 37 extend all in the Y direction of the side panel 3. A plurality of intermediate fixing parts 37 are formed in the intermediate zone 30 located between the proximal adhesive layer 35 and the distal adhesive layer 36. As shown in FIG. .2 and 4, the intermediate fixing parts 37 are narrower than either of the two adhesive layers 35 and 36. In the diaper 1A, the intermediate fixing parts 37 are spaced at equal intervals in the direction and X in the intermediate zone 30.

As illustrated in FIG. 4 (a), the side panel 3 of the diaper 1A is formed by placing elastic elements 33 stretched in the X direction at equal intervals in the Y direction between two rectangular sheets 31 and 32 of nonwoven fabric and by fixing the elastic elements 33 between two sheets 31 and 32 by means of the proximal adhesive layer 35, the distal adhesive layer 36 and the intermediate fixing parts 37. As illustrated in FIG. 4 (a), in the proximal adhesive layer 35, the distal adhesive layer 36 and the intermediate in the casing portions 37, the elastic elements 33 are fixed in a stretched state between the two sheets 31 and 32 by adhesive of the adhesive layers 35, 36 and 37. In the areas of the side panel 3 in which the elastic elements 33 are absent, the two sheets 31 and 32 are attached directly to each other by adhesive of adhesive layers 35, 36 and 37. As illustrated in FIG. 4 (a), adhesive-free, non-bonded zones 38 are provided — one between the proximal adhesive layer 35 and the adjacent intermediate fixing portion 37, at least one between the neighbors with the intermediate fixing parts 37 and one between the distal adhesive layer 36 and the adjacent intermediate fixing part 37, located in the direction of stretching of the side panel 3. In the diaper 1A in the first embodiment, the direction of stretching of the side panel 3 is the direction X of the diaper.

Each / each of the proximal adhesive layer 36, the distal adhesive layer 36 and the intermediate fixing parts 37 extends along the entire length of the side panel 3 in the Y direction across the whole set or preferably three or more elastic elements 33 extending in the X direction.

Each loose region 38 also extends over the entire length of the side panel 3 in the Y direction across the whole set, or preferably three or more elastic members 33 extending in the X direction.

The width of the proximal adhesive layer 35 or the distal adhesive layer 36 is preferably from 1.5 to 15 mm, more preferably from 3 to 12 mm.

The width of each intermediate fixing portion 37 is less than either of the two widths of the adhesive layers 35 and 36, as previously indicated, and is preferably 0.3 to 1.5 mm, more preferably 0.5 to 1.2 mm.

The width of each loose region 38 is preferably from 2 to 6 mm, more preferably from 3 to 5 mm.

In this configuration, the side panel 3 forms in its contracted relaxation state a zone GT assembled between the proximal adhesive layer 35 and the distal adhesive layer 36 due to the tensile force created by the plurality of elastic elements 33, as illustrated in FIG. 4 (b ) The assembled zone GT has hollow folds formed by those parts of the sheet 31 and sheet 32, in which the elastic elements 33 are not fixed between them. Similar folds are also formed between the intermediate fixing parts 37 adjacent in the X direction. Each fold extends in a direction intersecting the plurality of elastic elements 33. In particular, the side panel 3 of the diaper 1A has elastic elements 33 fixed therein in their stretched state in a proximal adhesive layer 35, the distal adhesive layer 36 and the intermediate fixing parts 37. In a state of relaxation of the side panel 3 with the elastic elements 33 tightened, those parts of the sheets 31 and 32 in which the elastic elements 33 n attached therebetween form a hollow folds on both sides of the side panel 3, as illustrated in Figure 4 (b). Each fold extends in the Y direction across the plurality of elastic members 33. In particular, as illustrated in FIG. 4 (b), folds are formed in the intermediate zone 30 of the side panel 3. When the elastic members 33 are pulled together, two sheets 31 and 32 are bent away from the elastic yarns 33 in each hollow non-bonded region 38, in which the elastic yarns 33 are not attached to the two sheets 31, 32, and are concave towards the elastic yarns 33 in each intermediate adhesive layer 37, resulting in many folds in the form of protrusions and troughs. Such folds do not disappear completely even while wearing a diaper. Since the intermediate fixing parts 37, especially in the case of the diaper 1A, are located in the intermediate zone 30 at equal intervals in the X direction, the two sheets 31 and 32 are folded in each unfastened zone 38 to substantially the same height from the elastic elements 33. Consequently, the folds formed with both sides of the assembled side zone 3 in the GT zone assembly have substantially the same height in the thickness direction of the side panel 3.

Folds extending in the Y direction also appear in areas of the side panel 3 having a proximal adhesive layer 35 and a distal adhesive layer 36 to form protrusions and depressions on both sides of the side panel 3 when the elastic members 33 are pulled together, as illustrated in FIG. 4 ( b) However, since the proximal adhesive layer 35 and the distal adhesive layer 36 provide fixation of the elastic elements 33 between the sheets 31 and 32, these folds are not hollow. The retraction of the elastic elements 33 in the proximal adhesive layer 35 and the distal adhesive layer 36 is limited, so that in the fold direction, which is the thickness direction of the side panel 3, the height of the zones having adhesive layers 35 and 36 is less than the height of the folds in the intermediate zone 30. Zones, having a proximal adhesive layer 35 and a distal adhesive layer 36, have less extensibility than the intermediate zone.

A fastening tape 4 is provided on the laterally distal edge portion 3a of the side panel 3. The fastening tape 4 will be described in detail. The fastening tape 4 includes a base sheet 42 and an attachment member 41 having a plurality of projections for engaging on a portion of the base sheet 42 distal in the X direction. As shown in FIG. 2, the fastening tape 4 of the diaper 1A is rectangular in its expanded state . The fastening tape 4 is formed by making the base sheet 42 having the same shape in plan view as the fastening tape 4 and attaching an element 41 for attaching to a portion of the base sheet 42 distal in the X direction. As illustrated in FIG. 3, the diaper 1A has a fastening tape 4 attached to the outer side (side Q in FIG. 3) of the distal end portion 3a of the side panel 3 by means of an adhesive layer 63 for fastening the tape. The adhesive layer 63 for fastening the tape has a width almost equal to the width of the sealed joint zone 60 in the X direction and is continuous along the entire length of the fastening tape 4 in the Y direction. Thus fastened, the fastening tape 4 is bent to the side facing the skin surface (inner side, side P in FIG. 3) of the side panel 3 before using the diaper 1A and is unbent when used. The diaper 1A has on the non-skin surface (outer side) of the front part A a receiving sheet 5 on which the fastening element 41 for fastening tape 4 to be fixed is fixed.

A side panel 3 having a fastening tape 4 attached thereto is attached to the side portion 2S of the absorbent assembly 2, as described below.

The disposable diaper according to the invention has a lateral edge portion 2S1 of the absorbent assembly 2 located in a plan view of the assembled area GT of the side panel 3. As for the first embodiment, the disposable diaper 1A has a laterally distal lateral edge portion 24S1 of the side sheet 24, which extends in the Y direction and is located on the hollow pleats assembled in the assembly area GT of the side panel 3 in a plan view. That is, in the diaper 1A, the side edge portion 2S1 of the absorbent kit 2 corresponds to the distal side edge portion 24S1 of the side sheet 24. The term “side edge portion 2S1” of the absorbent kit 2 means that subpart of the side portion 2S of the absorbent kit 2 that is located along the longitudinally extending direction laterally distal to the edge of the lateral portion 2S.

In particular, the diaper 1A has a stretchable side panel 3 fixed along each side portion 2S of the rear portion B of the absorbent assembly 2, as shown in FIG. The side panel 3 is attached at its end part 3d to the absorbent assembly 2 between the side sheet 24 and the lower sheet 22. As shown in FIGS. 1 and 3, the side sheet 24 of the diaper 1A is located on the skin-facing surface of the upper sheet 21 of the absorbent set 2 on the entire length of the absorbent assembly 2 by means of a fixing part 27, which is provided on the inner side (side P indicated in FIG. 3) of that part of the lower sheet 22, which protrudes laterally outward from the upper sheet 21, and on the inner side (side P on fi d. 3) a side panel 3 along the entire length of the absorbent assembly 2. As illustrated in FIG. 3, the side sheet 24 is attached to the sheet 31 forming the side panel 3 by the fixing part 27 and is attached to the part of the bottom sheet 22 that protrudes in the side outwardly from the topsheet 21, by means of an adhesive (fixing adhesive layer 62) that is continuous / continuous in the longitudinal direction of the absorbent assembly. When a side panel 3 attached to each side part 2S of the absorbent assembly 2 is visible in a plan view, distally in the lateral direction, the side edge portion 24S1 of the side sheet 24 overlaps the hollow pleated, assembled area GT of the side panel 3 so that the part of the assembled zone GT will be closed laterally by the distal lateral edge section 24S1 of the side sheet 24 without fixing this part and this section to each other.

When the side panel 3 is in a compressed relaxation state similar to that shown in FIG. 3, the ratio of the overlap area (S2) T between the side sheet 24 and the assembled area GT of the side panel 3 to the total area (S1) assembled in the assembly area GT (S2 (S1) preferably is at least 1/8, more preferably at least 1/5 and preferably 2/3 or less, more preferably 1/2 or less and, in particular, is preferably from 1 / 8 to 2/3, more preferably 1/5 to 1/2 in terms of preventing a situation where the side zone panel 3, having a proximal adhesive layer 35, leaves a red mark on the skin and adheres to the skin, if one takes into account the stretching of the zone having the proximal adhesive layer 35. The total area (S1) of the side panel 3 assembled in the area zone GT is defined as the plan view shows the area of the side panel 3 assembled in the assembly of the zone GT in the compressed state of relaxation, and the overlap area (S2) T represents the overlap area defined between the side sheet 24 and the side panel 3 assembled in the assembly of the GT zone of the side panel 3 m relaxed state (see. figure 3).

The diaper 1A has a side sheet 24 attached to the part of the back part B (in the back part B with the exception of the portion having the side panel 3), the crotch part C and the front part A to that part of the bottom sheet 22 that projects laterally outward from the lateral edge of the upper sheet 21, in the region of the fixing portion 27, and also attached to that portion of the lower sheet 22 that projects laterally outward from the lateral edge of the upper sheet 21 by means of an adhesive (fixing adhesive layer 62), continuous in the longitudinal direction and. Both the fixing portion 27 and the fixing adhesive layer 62 extend substantially along the entire length of the absorbent assembly 2.

The diaper 1A has a side sheet 24 attached to the top sheet 21 by an adhesive layer 64, as illustrated in FIG. 3, in each of the longitudinally defined ends of the absorbent assembly 2, that is, in the rear portion B and the front portion A As illustrated, the adhesive layer 64 is located closer to the centerline CL than the fixing portion 27. The adhesive layer 64 is provided in the rear portion B and the front portion A, but is not provided in the crotch portion C.

The diaper 1A of the first embodiment is put on the carrier by bending the fastening tapes 4 away from the respective side panels 3, applying pulling forces to the fastening tapes 4 to stretch the side panels 3 and pressing the fastener element 4 of each fastening tape 4 to the receiving sheet 5.

Next will be described the materials from which the diaper 1A is formed.

The top sheet 21, the bottom sheet 22 and the absorbent element 23, which form the absorbent set 2, can be made of any materials commonly used in absorbent products, including disposable diapers and sanitary napkins. For example, the topsheet 21 may be a hydrophilic liquid permeable, non-woven fabric, or a three-dimensionally perforated film. The bottom sheet 22 may consist of a liquid-impermeable or water-impermeable layer (this term encompasses water-repellent material), a plastic film as a leak-proof sheet 22a, and a non-woven material formed by various methods, such as a non-woven fabric bonded by transmission through and through, non-woven material of spunbond production method, non-woven material obtained by hydro-entangling, or non-woven material obtained by needle-piercing, as the outer sheet 22b nonwoven. The absorbent element 23 may consist of an absorbent core formed from a combination of fibers (e.g., cellulose fibers) or non-woven material, which / which may contain absorbent polymer in the form of particulate matter and from a permeable wrapper (e.g., sanitary paper or non-woven material), wrapping absorbent core. The side sheet 24, designed to form a cuff that prevents leakage, and assemblies for the legs, may be a film, non-woven material, woven material or a laminate from these sheet materials.

Sheets 31 and 32 (sheets of the side panel) forming the side panel 3 may be formed from any sheet materials commonly used in absorbent products, including disposable diapers and sanitary napkins. For example, sheets 31 and 32 may be formed from a nonwoven material, a woven material, a film, or a laminate from these materials.

The elastic element 33, the elastic element 25, designed to form a cuff that prevents leakage, and the elastic element 26, designed to form assemblies for the legs, can be an elastic thread or a core made of natural rubber, polyurethane, a styrene-isoprene copolymer, a styrene-butadiene copolymer or a copolymer of ethylene and α-olefin (for example, a copolymer of ethyl acrylate and ethylene). Preferably, the plurality of elastic elements 33 used in the same side panel are of the same type and are fixed with the same degree of stretching for reasons related to manufacturing cost and ease of production.

The attachment element 41 and the base sheet 42 forming the fastening tape 4 can be made of any materials commonly used in absorbent products, including disposable diapers. For example, the attachment member 41 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 42 may be a sheet or non-woven material formed from synthetic resins, for example, polyethylene, polypropylene and polyethylene terephthalate, or from composite materials formed from two or more synthetic resins.

Adhesives used to bond or fix various elements, including the adhesive of the outer adhesive layer 61 for attaching the seep-away sheet 22a and the outer non-woven sheet 22b to each other, and the adhesive of the proximal adhesive layer 35 for securing the sheet 22a, prevent leakage, and the outer sheet 22b of nonwoven material to each other to form a side panel 3, preferably thermoplastic polymers such as amo polypropylene polyolefins, ethylene vinyl acetate copolymers (EVA), ethylene acrylic acid ester copolymers (EEA), block alternating styrene-butadiene block copolymers (SBS), alternating block styrene-isoprene copolymers (SIS), block copolymers block alternating styrene and ethylene / butylene (SEBS); and alternating block block copolymers of alternating styrene and ethylene / propylene (SEPS) or a mixture thereof. Hot melt adhesive is preferred.

The proximal adhesive layer 35, the distal adhesive layer 36, the intermediate adhesive parts 37, the external adhesive layer 61, the adhesive adhesive layer 62, the adhesive layer 63 for attaching the tape and the adhesive layer 64 can be formed by applying adhesive to one or both of the two sheets, between by which these adhesive layers must be arranged, by various known methods and by joining two sheets under pressure.

The adhesive forming each adhesive layer is preferably applied continuously by using an applicator, such as a spray gun or a spray gun. The adhesive can also be applied with a pattern, for example, with a line pattern, a spiral pattern, an omega-like pattern or a dot pattern by using a ball atomizer, a spray gun to form a spiral pattern, a spray gun to form an omega-like pattern, transfer roller or similar applicator.

The side panels 3 and side sheets 24 present in the disposable diaper of the invention can be manufactured by any method without any particular limitation.

A preferred method for manufacturing the side panels used in the disposable diapers of the invention will be described with specific reference to the manufacture of side panels 3 of the diaper 1A.

An example of a preferred method for manufacturing the side panel 3 will be described by means of FIG. The device 7 for manufacturing a stretch sheet shown in FIG. 5 includes: two elongated conveyor structures 71 and 71 for moving yarns that are spaced apart from each other parallel to each other; a device 72 for winding an elastic element that wraps an elastic element around two elongated conveyor structures designed to move the threads, to change the direction of stretching of the elastic element to a direction extending across the longitudinal direction of the elongated conveyor structures to move the threads (direction R in FIG. 5), and a connecting device 73 that connects the continuous sheets 31 ′ and 32 ′ facing each other with the elastic element 33 wound between them by means of a device 72 for winding an elastic element and moved by means of elongated conveyor structures for moving threads. The elongated conveyor structure 71 for moving the thread is preferably an endless belt having a branch extending forward and moving in the R direction, and a branch extending in the opposite direction and moving in the opposite direction with respect to the R direction, with only the forward branch grabs the elastic element 33 and moves the elastic element 33 in the direction R. The endless belt is stretched over the pulleys or gears and is driven by rotation of the pulley or gears. Although each elongated conveyor structure 71 for moving the thread may be one endless belt, it is preferable to use conveyor structures, each of which consists of an upper endless belt and a lower endless belt, as illustrated in Fig. 5. By bringing the upper and lower belts into motion at different speeds, the elastic element 33 is wound, which is wound around two conveyor structures in a zigzag view in plan view immediately after winding, in parallel with a certain interval and fixing it between continuous sheets 31 'and 32' with parallel arrangement. The elongated conveyor structure 71 for moving the thread may be a rod-like structure having a spiral groove or protrusion on the outer surface and rotating about its axis.

In a preferred manufacturing method of the side panel 3 shown in FIG. 5, an adhesive 34 for forming a proximal adhesive layer 35, a distal adhesive layer 36 and intermediate fixing parts 37 is applied to a continuous sheet 31 ', which is provided as a continuous sheet sheet 31 , in the form of strips by using a known adhesive applicator 76. Adhesive 34 may be applied to continuous sheet 32 ’continuously.

Continuous sheets 31 'and 32' on which adhesive is attached are joined together with pieces of stretched elastic member 33 located therebetween and combined into a composite sheet by squeezing on both sides between two pressure rollers 74 as a connecting device 73. After that, the elastic the element 33 is cut off at locations outside of both side edges of the composite sheet by using a cutting device 77, such as a cutter having a cutting knife, to produce a stretch sheet 3 ′.

The stretch sheet 3 ’is then cut into pieces with the length of the side panel 3 using any cutting tool. Thus, efficient continuous production of the side panel 3 is ensured.

A disposable diaper 1A is made, for example, as described below, by using a continuous web of side panel 3 (stretch sheet 3 ’).

More specifically, the disposable diaper 1A can be manufactured efficiently by using a continuous web of side panel 3 (stretch sheet 3 ’) in accordance with steps (1) to (11) below.

(1) A step in which an adhesive intended to form an adhesive layer 63 for attaching a tape is applied to a continuous web of bonding tape 4 having an attachment member 41, and a continuous web of bonding tape 4 is cut to the size of the bonding tape 4 and attached to the stretch sheet 3 'at intervals. (2) The step in which the fastening tape 4 is folded back and temporarily attached to the stretch sheet 3 ’. (3) A step in which the stretch sheet 3 ′ is cut into pieces with a size of the side panel 3. (4) A step in which the seepage-free sheet 22a and the outer nonwoven sheet 22b are joined together by the outer adhesive layer 61 to form bottom sheet 22. (5) A step in which an adhesive intended to form a fixing adhesive layer 62 is applied as a continuous layer to the side of the bottom sheet 22. (6) A step in which a side panel 3 having a fastening tape 4 attached attached to it, continuously to the lower sheet web by means of a fixing adhesive layer 62. (7) A step in which the adhesive layer 64 is applied to parts of a continuous sheet of the upper sheet. (8) The step in which the side sheet 24 is formed by bending the opposite sides of the continuous sheet, fixing the elastic elements 25 in their stretched state inside with respect to one of the bend vertices by adhesive, fixing the elastic elements 26 in their stretched state inside with respect to the top of another bend by means of adhesive and attachment of the wrinkled / bent sides facing each other to each other by forming fusion joints in zones except for the zone having elastic egg elements 25 and 26 fixed in it, for example, by heat sealing. (9) The step in which the absorbent element 23 is placed at intervals in the direction of movement of the semi-finished product in the machine between the continuous sheet of the bottom sheet having two side panels 3 attached to it and the continuous sheet of the top sheet to form a continuous set, and the side sheet 24 is applied on each side of the continuous kit and is attached to it by means of a fixing adhesive layer 62 and adhesive layer 64. (10) The step in which the continuous kit having side sheets 24 fixed thereon is suspended gayut heat sealing or welding another method for forming the locking portions 27 to thereby provide additional fixing of the side sheets 24 to form the continuous web of the diaper 1A. (11) The step in which the resulting continuous web of diaper 1A is cut into individual diapers 1A for the continuous production of diapers 1A.

A disposable diaper according to the invention can be made in accordance with any conventionally known method, except for using a side panel 3 made as described above.

The effects and benefits obtained by using the diaper 1A of the present invention are described below.

As illustrated in FIGS. 2 and 3, the diaper 1A has a lateral edge portion 2S1 of its absorbent assembly 2 located on the hollow folds assembled in the assembly area GT of the side panel 3. Therefore, since when stretching the stretching side panels 3 and securing the element 41 each a fastening tape 4 for attachment to the receiving sheet 5 of the front portion A for applying relatively high pressure when worn to the side of the carrier from the side of the side portion 2S of the absorbent assembly while wearing, the sides the second edge portion 2S1 covers the skin-facing side of that area of the side panel 3 in which the proximal adhesive layer 35 is provided for fixing the elastic elements 33, a situation is prevented in which the folds of this zone having the proximal adhesive layer 35 will leave red marks on skin of the carrier, and the adhesion of the sheet 31 of the side panel 3 to the skin of the carrier is prevented. This provides increased comfort for the wearer. In particular, since in the diaper 1A, the lateral edge portion 2S1 of the absorbent assembly 2 corresponds to the laterally distal lateral edge portion 24S1 of the side sheet 24, the distal lateral edge portion 24S1 is also located on the hollow folds assembled in the assembly area GT of the side panel 3. This The configuration guarantees the effects discussed above.

As illustrated in FIG. 3, the diaper 1A side panel 3 has a plurality of intermediate fixing parts 37 between the proximal adhesive layer 35 and the distal adhesive layer 36, and in a relaxed state, a hollow fold extending in the direction crossing the elastic elements 33 is formed between adjacent intermediate fixing parts 37. Since the height of these folds in the thickness direction of the side panel 3 exceeds the height of the folds formed in areas having a proximal adhesive layer 35 and a distal adhesive layer 36, the side panel 3 will have improved spring characteristics due to the plurality of hollow folds extending across the elastic members 33. This makes it less likely that wrinkles in the area of the side panel 3 that has the proximal adhesive layer 35 will leave red marks on the wearer's skin as a result of which the comfort for the wearer is further enhanced. In particular, since in the diaper 1A, the folds of the side panel 3 assembled in the assembly of the zone GT 3 have the same height in the thickness direction of the side panel 3, the effects discussed above are guaranteed to an even greater extent.

Next, a diaper according to a second embodiment of the invention will be considered. The disposable diaper 1B of the second embodiment differs from the diaper 1A of the first embodiment in the form of folds formed in the assembled side panel zone GT 3. The description of the diaper 1B of the second embodiment will be mainly limited to the difference from the diaper 1A of the first embodiment. Other similar components are denoted by like reference numerals and will not be described in redundant detail. Unless the context specifically implies otherwise, the description of the diaper 1A of the first embodiment is equally valid for the diaper 1B of the second embodiment.

Similarly to the side panel of the diaper 1A, the side panel 3 of the diaper 1B has in its intermediate zone 30 between the proximal adhesive layer 35 and the distal adhesive layer 36 a plurality of intermediate fixing parts 37, in which two sheets 31 and 32 are attached to each other, each of which is intermediate the fixing parts 37 are formed of an adhesive layer extending in the Y direction, as illustrated in FIGS. 6 and 7.

Similar to the side panel of the diaper 1A, the side panel 3 of the diaper 1B has a laterally proximal end portion 3d attached to the absorbent assembly 2 between the side sheet 24 and the bottom sheet 22, as illustrated in FIGS. 6 and 7. As illustrated, the side edge portion 2S1 of the absorbent assembly 2 corresponds to a laterally distal lateral edge portion 24S1 of the side sheet 24.

Returning back to the intermediate fixing parts 37 forming the side panel 3 of the diaper 1B, it should be noted that the distance between the intermediate fixing parts 37 adjacent to the X direction is shorter in the area closer to the proximal adhesive layer 35 than in the area located closer to the distal adhesive layer 36, as shown in Fig.6. As illustrated in FIGS. 6 and 7, each intermediate fixing portion 37 is narrower than either of the two adhesive layers 35 and 36. In particular, the intermediate zone 30 of the diaper 1B is divided into two subzones, namely, the proximal intermediate subzone 30b located closer to the proximal adhesive layer 35, and a distal intermediate subzone 30a located closer to the distal adhesive layer 36. A plurality of intermediate fixing portions 37 are located in the proximal intermediate subzone 30b at equal intervals in X. A plurality of intermediate locking parts 37 are located in the distal intermediate subzone 30a at equal intervals in the X direction. As illustrated in FIG. 6, the distance between the intermediate locking parts 37 adjacent to the X direction in the proximal intermediate subzone 30b is shorter than with a distance between the intermediate fixing parts 37 adjacent in the X direction in the distal intermediate subzone 30a. The distance between adjacent intermediate locking parts 37 has the same value as the width of the loose zone 38.

In the diaper 1B, the width of the proximal adhesive layer 35 or the distal adhesive layer 36 is preferably from 1.5 to 15 mm, more preferably from 3 to 12 mm.

In the diaper 1B, the width of each intermediate fixing portion 37, which is less than the width of either of the two adhesive layers 35 and 36, as previously indicated, is preferably 0.3 to 1.5 mm, more preferably 0.5 to 1.2 mm .

In the diaper 1B, the distance between adjacent intermediate holding portions 37 (i.e., the width of each loose zone 38) in the X direction in the proximal intermediate subzone 30b is preferably from 2 to 4 mm, more preferably from 2.5 to 3.8 mm.

In the diaper 1B, the distance between adjacent intermediate holding portions 37 (i.e., the width of each loose zone 38) in the X direction in the distal intermediate subzone 30a is preferably from 3 to 6 mm, more preferably from 3.5 to 5.5 mm.

Similarly to the side panel of the diaper 1A, the side panel 3 of the diaper 1B is formed by placing elastic elements 33 stretched in the X direction between two rectangular sheets 31 and 32 of nonwoven fabric at equal intervals in the Y direction and by fixing the elastic elements 33 between the two sheets 31 and 32 using the proximal adhesive layer 35, the distal adhesive layer 36 and the intermediate fixing parts 37.

Formed in this way, the side panel 3 of the diaper 1B forms, in its relaxed state, an assembled zone GT between the proximal adhesive layer 35 and the distal adhesive layer 36 due to the pulling force created by the plurality of elastic elements 33, as illustrated in FIG. 7. The assembled zone GT has hollow folds in which the elastic members 33 are not attached to any of sheets 31 and 32. The assembled zone GT is divided into a GTb subband with low assemblies and a relatively small crease height that is closer to the proximal adhesive layer 35, and a GTa subband with high assemblies and a relatively large crease height that is closer to the distal adhesive layer 36. As used herein, the term “crease height” means, as seen from the cross section, the distance from the surface in contact with the skin to the surface not in contact with the skin, in a state of relaxation with compressed elastic elements 33. In particular, since the side panel 3 of the diaper 1B has elastic elements 33 fixed in their stretched state in the area of the proximal adhesive layer 35, distal adhesive layer 36 and the intermediate fixing parts 37, many hollow folds are formed where the elastic elements 33 are not attached to the sheets 31 and 32, on both sides of the side panel 3 in a state of relaxation when compressed elastic x elements 33. Each pleat extends in a direction Y transverse to the plurality of elastic members 33. Specifically, as illustrated in Figure 7, folds are formed in the intermediate area 30 the side panel 3. When the elastic elements 33 are pulled together, two sheets 31 and 32 are bent away from the elastic threads 33 in each hollow loose zone 38, in which the elastic elements 33 are not attached to the two sheets 31 and 32, and are concave towards the elastic threads 33 in each intermediate the adhesive layer 37, resulting in the formation of many folds in the form of protrusions and depressions. In particular, in the case of the diaper 1B, the intermediate zone 30 is divided into the proximal intermediate subzone 30b and the distal intermediate subzone 30a, and the distance between the equally spaced intermediate fixing parts 37 in the proximal intermediate subzone 30b is less than the distance between the equally spaced intermediate fixing parts 37 in the distal intermediate subzone 30a. As a result, the height of the bulges of the two sheets 31 and 32 in each loose region 38, i.e., the height of the folds formed on each side of the side panel 3, in the thickness direction of the side panel 3 has a smaller value in the proximal intermediate subzone 30b of the assembled area zone GT than in the distal intermediate subzone 30a assembled in the assembly of the zone GT. The assembled subband of the proximal intermediate subzone 30b is a low-assembly GTb subzone, and the assembled sub-zone of the proximal intermediate subzone 30b is a high-assembly GTb subzone. Thus, the assembled GT region is divided into a low-assembly GTb subband and a high-assembly GTa subzone. The height (h1) of the folds in the high assembly subzone is 0.5 mm or more, preferably 1 mm or more and 3 mm or less, preferably 9 mm or less. The height (h2) of the folds in the low assembly subzone is 0.1 mm or more, and preferably 8 mm or less. The absolute difference in the fold heights between the high-assembly subzone and the low-assembly subzone (Δh = h1-h2) is 0.5 mm or more, preferably 1.0 mm or more and 5 mm or less, preferably 3 mm or less. When the difference Δh is in this range, the difference Δh will be less than the thickness of the side sheet, so that there will be a small level difference provided that the distal laterally, the lateral edge portion of the side sheet is located on the subband with low assemblies, resulting in smooth contact with the skin even when the folds do not provide springing or provide little springing.

A method for attaching a side panel 3 having a fastening tape 4 to the side portion 2S of the absorbent assembly 2 will be described.

In the diaper 1B of the second embodiment, the laterally distal, lateral edge portion 24S1 extending along the Y direction of the side sheet 24, which corresponds to the lateral edge portion 2S1 of the absorbent assembly 2, is located on the low-assembly hollow fold subzone GTb assembled in the zone assemblies GT of the side panel 3. In other words, the side panel 3 of the diaper 1B is attached to each side part 2S of the absorbent assembly 2 in such a way that the laterally distal lateral side edge portion 24S1 of the sides of the second sheet 24 overlaps the low-assembly, hollow-fold GTb subzone GTb assembled into the assemblies of the GT zone of the side panel 3, and part of the low-assembly GTb subzone is closed laterally by the lateral edge portion 24S1 of the side sheet 24 without attaching this part and this portion to each other to friend.

When the side panel 3 is in a compressed state of relaxation, as illustrated in FIG. 7, the ratio of the area (S3) of the low-assembly subband GTb to the total area (S1) collected in the assembly of the zone GT of the side panel 3, S3 / S1, is preferably from 1 / 8 to 2/3, more preferably from 1/5 to 1/2 for reasons related to guaranteeing breathability and extensibility of the side panel 3.

When the side panel 3 is in a compressed state of relaxation, the ratio of the area (S2) of the overlap T between the side sheet 24 and the assembled area GT of the side panel 3 to the total area (S1) of the assembled area zone GT, side panel 3, S2 / S1, preferably is at least 1/8, more preferably at least 1/5 and preferably 2/3 or less, more preferably 1/2 or less, and, in particular, preferably from 1/8 to 2 / 3, more preferably from 1/5 to 1/2 from the point of view of preventing a situation in which an area of the side panel 3 having the proximal adhesive layer 35 leaves a red mark on the skin and adheres to the skin if we take into account the extensibility of the zone having the proximal adhesive layer 35. The total area (S1) of the side panel 3 assembled in the zone assembly GT is the planically determined area of the collected in the assembly of the zone GT side panel 3 in a compressed state of relaxation; the area (S3) of the low-assembly GTb subzone GT is the plan-defined area of the low-assembly sidebar GTb sub-zone 3 in the compressed relaxed state, and the overlap area (S2) T is the plan-defined overlap area T between the side sheet 24 and the side panel 3 assembled in the zone GT in the compressed state of relaxation (see FIG. 7).

The effects and benefits obtained by using the diaper 1B of this embodiment are described below.

The effects and benefits obtained by using the diaper 1B are described below with reference to the difference from the effects and advantages of the diaper 1A. Unless the context specifically implies otherwise, a description of the effects and benefits of diaper 1A is equally valid for diaper 1B.

As illustrated in FIGS. 6 and 7, the diaper 1B has a laterally extending along the Y direction, an edge portion 24S1 of the side sheet 24 located on the low-assembly hollow pleated subzone GTb assembled in the assembly area GT of the side panel 3. Therefore , it is less likely that the thickness of the low-assembly GTb subzone will be greater than the thickness of the high-assembly zone GTa, and as a result, the longitudinal distal edge of the laterally distal, lateral edge portion 24S1 of the side sheet 24 is unlikely to leave a red layer units on the skin of the wearer.

The disposable diaper according to the invention is not limited to the diapers 1A and 1B of the first and second embodiments, and various changes and modifications can be made therein. The constituent elements of the disposable diapers 1A and 1B in accordance with the first and second embodiments may be practiced in appropriate combinations without departing from the spirit and scope of the invention.

As illustrated in FIGS. 3 and 7, the diapers 1A and 1B of the first and second embodiments have a side panel 3 attached at its proximal end part 3d to the absorbent assembly 2 between the side sheet 24 and the lower sheet 22, and the side edge portion 2S1 of the absorbent set 2 corresponds to the laterally distal lateral edge portion 24S1 of the side sheet 24. However, the lateral edge portion 2S1 of the absorbent kit 2 may correspond to a lateral edge portion other than the distal lateral margin the stitch 24S1 of the side sheet 24. For example, the side panel 3 may be attached to the absorbent assembly 2 in a different way, as in the diapers 1C-1E of the third to fifth embodiments, illustrated in FIGS. 8-10, in which the proximal end part 3d of the side panel 3 is attached to the non-skin side surface of the bottom sheet 22 of the absorbent assembly 2 by the adhesive layer 65. In more detail, in the diaper 1C of the third embodiment illustrated in FIG. 8, the edge of the distal lateral edge portion 24S1 the shroud sheet 24 in a plan view is flush with the laterally extending side edge portion 22b1 of the outer nonwoven fabric sheet 22b forming the bottom sheet 22. That is, the side edge portion 2S1 of the absorbent assembly 2 corresponds to the side edge portion 22b1 of the bottom sheet 22, as well as the distal side edge portion 24S1 of the side sheet 24, and both side edge portions 22b1 and 24S1 are located in the assembled area GT of the side panel 3 in a plan view. In the diaper 1D of the fourth embodiment shown in FIG. 9, the laterally distal lateral edge portion 24S1 of the side sheet 24 extends laterally outward from the longitudinally extending side edge portion 22b1 of the outer sheet 22b of non-woven material forming the bottom sheet 22. That is, the lateral edge portion 2S1 of the absorbent assembly 2 corresponds to the distal lateral edge portion 24S1 of the side sheet 24, and the distal lateral edge portion 24S1 is located in the assembled area GT more panel 3 in a plan view. In the diaper 1E of the fifth embodiment shown in FIG. 10, the longitudinally extending side edge portion 22b1 of the outer nonwoven fabric sheet 22b forming the bottom sheet 22 protrudes laterally outward from the distal side edge portion 24S1 of the side sheet 24. That that is, the side edge portion 2S1 of the absorbent assembly 2 corresponds to the side edge portion 22b1 of the bottom sheet 22, and the side edge portion 22b1 is located in the assembled zone GT of the side panel 3 in a plan view.

While the diapers 1A and 1B of the first and second embodiments are laterally distal, the lateral edge section 24S1 of the side sheet 24 covers a part having hollow folds assembled in the zone assembly GT of the side panel 3 without attaching this section and this part to each other to a friend, as illustrated in FIGS. 3 and 7, laterally distal, the lateral edge portion 24S1 of the side sheet 24 can be partially attached to the assembled area GT. In the case of such a fastening, the bending of the distal side edge portion 24S1 of the side sheet 24 on itself is prevented by the action of an unexpected external force. When attaching the distal lateral edge portion 24S1 to the assembled zone GT of the side panel 3, it is preferable to apply adhesive to the assembled zone GT in its relaxed state with gaps along the entire length of the side panel 3 in the Y direction for reasons related to preventing stretching of the side panel 3 .

While in the diapers 1A and 1B of the first and second embodiments, the proximal adhesive layer 35 of the side panel 3 overlaps the fixing adhesive layer 62 (intended to be attached to the lower sheet 22) in the thickness direction, as illustrated in FIGS. 3 and 7, the proximal the adhesive layer 35 may overlap the fixing part 27 (intended for fixing the side sheet 24) or both the fixing adhesive layer 62 and the fixing part 27. That is, the side panel 3 will be attached to the absorbent assembly at least m Here, in part of its zone having a proximal adhesive layer 35, and this at least part of the zone having a proximal adhesive layer 35 will actually be non-elastic. Accordingly, when the side panel 3 is stretched, the proximal adhesive layer 35 does not stretch to such an extent that it is outside the edge of the laterally distal lateral edge portion 24S1 of the side sheet 24.

While in the diapers 1A and 1B of the first and second embodiments, each of the intermediate fixing parts 37 that form the side panel 3 is an adhesive layer extending in the Y direction, as illustrated in FIGS. 4 (a) and 4 ( b) they can be formed by fusion bonding, such as heat sealing, in this case, the fusion bonding junctions will be formed between each two elastic elements 33 adjacent in the Y direction to form many the set of break lines connecting points, each of which extends in direction Y and which are spaced apart in the direction X.

While in the diapers 1A and 1B of the first and second embodiments, the side panel 3 has intermediate fixing parts 37 between the proximal adhesive layer 35 and the distal adhesive layer 36, as shown in FIGS. 2 and 6, the side panel 3 does not always have to similar intermediate locking parts 37. While in the above embodiments, the plurality of intermediate locking parts 37 have almost the same width, they need not have the same width provided that their width is less than different adhesive layers 35 and the width of the adhesive layer 36. While in the diaper 1A of the first embodiment, the intermediate fixing parts 37 are located at equal distances from each other in the intermediate zone 30, as shown in figure 2, and in the diaper 1B of the second In an embodiment, the intermediate locking parts 37 located at equal distances from each other in each of the proximal intermediate subzone 30b and the distal intermediate subzone 30a, as shown in FIG. 6, need not be located at such regular intervals.

While in the diapers 1A and 1B of the first and second embodiments, the side sheet 24 has a two-layer structure over its entire area as a result of folding as shown in FIGS. 3 and 7, the side sheet 24 need not be double-layer over its entire area . For example, the side sheet 24 may have a two-layer structure only in its one side part as a result of folding to form a fold, within which elastic elements 25 will be fastened to form a cuff that prevents leakage, and a single-layer structure in its other side part.

While in the diapers 1A and 1B of the first and second embodiments, the side panel 3 is fixed by adhesive between the inner side (side P in FIG. 3) of the bottom sheet 22 and the outer side (side Q in FIG. 3) of the absorbent side sheet 24 set 2, it can be attached to the outer side (side Q in FIG. 3) of the bottom sheet 22 of the absorbent set 2. For example, the side panel 3 can be attached on its inside (side P in figure 3) to the outside (side Q in FIG. 3) of the bottom sheet by adhesive, or a side sheet 24, a bottom sheet 22, and a side panel 3 can be fastened together by fusion bonding, such as heat welding or ultrasonic welding, or compression bonding.

The following paragraphs are further disclosed with reference to the above embodiments.

[1] A disposable diaper comprising an elongated absorbent kit and a stretchable side panel attached to both side parts of the absorbent kit, the absorbent kit comprising a top sheet located on the side of its surface facing the skin, a bottom sheet located on the side of its surface not facing the skin, and an absorbent element located between the upper sheet and the lower sheet, while the fastening tape is attached to the laterally distal end part of the bo the panel, while the fastening tape has an element for attaching, made with the possibility of fixing on not facing the skin of the surface of the absorbent kit, while:

the absorbent kit further comprises a side sheet located along its both side parts;

side panel contains: two sheets of side panel; a plurality of elastic elements which are fixed in their stretched state between two sheets of the side panel and which extend along the lateral direction of the absorbent assembly; a proximal adhesive layer that extends in the longitudinal direction of the absorbent assembly and in which a proximal end portion of each of the elastic elements is fixed, and a distal adhesive layer that extends in the longitudinal direction of the absorbent assembly and in which a distal end portion of each of the elastic elements is fixed, while the lateral the panel is formed by fixing elastic elements in their stretched state between two sheets of the side panel by means of a proximal adhesive layer and distal adhesive layer;

the side panel is configured so that it has a zone assembled in the assembly between the proximal adhesive layer and the distal adhesive layer in its compressed state of relaxation due to the tensile force created by the elastic elements, while the zone assembled in the assembly has hollow folds, in which the elastic elements are not attached to the sheets of the side panel;

the side panel further comprises a plurality of intermediate fixing parts that extend in the longitudinal direction of the absorbent assembly, which are located between the proximal adhesive layer and the distal adhesive layer and in which two sheets of the side panel are attached to each other;

each of the folds is formed between adjacent laterally, intermediate fixing parts and runs across many elastic elements; and

the absorbent set has, in its plan view, its each lateral edge portion located on the side panel region assembled in the assembly.

[2] The disposable diaper according to [1], wherein the distance between the laterally adjacent intermediate fixing parts is shorter in the area closer to the proximal adhesive layer than in the area closer to the distal adhesive layer;

in a compressed state of relaxation, the assembled zone is divided into a low-assembly subzone closer to the proximal adhesive layer and a high-assembly subzone closer to the distal adhesive layer, while the low-assembly subzone has a relatively small fold height and subzone with high assemblies has a relatively greater height of the folds; and

each lateral edge portion of the absorbent assembly corresponds to a lateral distal, lateral edge portion of each side sheet, while a lateral distal, lateral edge portion of the side sheet is located in the subband with low assemblies in plan view.

[3] A disposable diaper according to [1] or [2], wherein the assembled area has a low-assembly subzone and high-assembly subzone, and the fold in the high-assembly zone has a fold height of 0.5 mm or more, preferably 1 mm or more and 3 mm or less, preferably 9 mm or less.

[4] The disposable diaper according to [2] or [3], wherein the crease in the low-assembly subzone has a crease height of 0.1 to 8 mm.

[5] A disposable diaper according to any one of [2] to [4], wherein the absolute height difference (Δh) of the folds between the high assembly subzone and the low assembly subzone is 0.5 mm or more, preferably 1.0 mm or more and 5 mm or less, preferably 3 mm or less.

[6] The disposable diaper according to any one of [1] to [5], wherein each side edge portion of the absorbent assembly is partially attached to the assembled area of each side panel in a plan view.

[7] A disposable diaper according to any one of [1] to [6], wherein the proximal or distal adhesive layer has a width of 1.5 to 15 mm, preferably 3 to 12 mm.

[8] The disposable diaper according to any one of [1] to [7], wherein each intermediate fixing portion is narrower than the proximal adhesive layer and the distal adhesive layer, and has a width of 0.3 to 1.5 mm, preferably from 0.5 to 1.2 mm.

[9] The disposable diaper according to any one of [1] to [8], wherein, in the fold direction representing the direction of thickness of the side panel, the height of the zones having the proximal adhesive layer and the distal adhesive layer is less than the height of the folds in the intermediate zone, located between the proximal adhesive layer and the distal adhesive layer.

[10] A disposable diaper according to any one of [1] to [9], wherein with the side panel in a compressed state of relaxation, the ratio of the overlap area (S2) between the side sheet and the assembled area of the side panel to the total area ( S1) of the area assembled, S2 / S1, is at least 1/8, preferably at least 1/5 and 2/3 or less, preferably 1/2 or less.

[11] A disposable diaper according to any one of [1] to [10], wherein the side panel sheet is a nonwoven fabric, woven fabric, film or laminate of two or more of these sheet materials.

[12] The disposable diaper according to any one of [1] to [11], wherein each side of the absorbent assembly corresponds to a laterally distal side of each side sheet.

[13] A disposable diaper according to any one of [1] to [12], wherein the side panel is attached at its laterally proximal end portion to the absorbent assembly such that it is located between the side sheet and the bottom sheet, and

the lateral edge portion of the absorbent assembly corresponds to the laterally distal lateral edge portion of the side sheet.

[14] A disposable diaper according to any one of [1] to [12], wherein the side panel is attached at its laterally proximal end portion to a non-skin side of the bottom sheet of the absorbent assembly, and

the lateral edge portion of the absorbent assembly corresponds to the lateral edge portion of the bottom sheet.

[15] A disposable diaper according to any one of [1] to [14], wherein the side sheet is formed of one sheet which is impervious to liquids, and

each of the opposite side portions of the side sheet is folded toward the side of its surface not facing the skin, so that the side sheet has a two-layer structure.

[16] A disposable diaper according to any one of [1] to [15], wherein the fastening tape is attached to the laterally distal end portion of the side panel,

the fastening tape comprises a base sheet and an attachment element located on a portion of the base sheet distal in the lateral direction, the attachment element having a plurality of protrusions for interaction,

the fastening tape is rectangular in its expanded state, and

the bonding tape is formed by making the base sheet having the same shape in plan view as the bonding tape, and attaching an element for attaching to the lateral distal portion of the base sheet.

[17] The disposable diaper according to any one of [1] to [16], wherein the absorbent assembly has an elongated rectangular shape and is divided into a front portion placed on the front side of the carrier in use, a lower portion placed on the bottom side of the carrier in use , and the crotch portion placed at the perineum of the wearer when used.

[18] A disposable diaper according to any one of [1] to [17], wherein the bottom sheet is a composite sheet consisting of a liquid impermeable or low permeability sheet, a leak-proof sheet, an outer adhesive layer and an outer nonwoven sheet material attached to the side of the non-permeable sheet surface of the skin, by means of an external adhesive layer.

[19] A disposable diaper according to any one of [1] to [18], having an infiltration cuff and leg assemblies.

Claims (37)

1. A disposable diaper comprising an elongated absorbent kit and a stretchable side panel attached to both side parts of the absorbent kit, the absorbent kit comprising a top sheet located on the side of its surface facing the skin, a bottom sheet located on the side of its surface, not facing the skin, and an absorbent element located between the upper sheet and the lower sheet, while the fastening tape is attached to the laterally distal end portion of the side a new panel, while the fastening tape has an element for attaching, made with the possibility of fixing on the surface of the absorbent set not facing the skin, while: the absorbent kit further comprises a side sheet located along its both side parts; side panel contains: two sheets of side panel; a plurality of elastic elements which are fixed in their stretched state between two sheets of the side panel and which extend along the lateral direction of the absorbent assembly; a proximal adhesive layer that extends in the longitudinal direction of the absorbent assembly and in which a proximal end portion of each of the elastic elements is fixed, and a distal adhesive layer that extends in the longitudinal direction of the absorbent assembly and in which a distal end portion of each of the elastic elements is fixed, while the lateral the panel is formed by fixing elastic elements in their stretched state between two sheets of the side panel by means of a proximal adhesive layer and distal adhesive layer; the side panel is configured so that it has a zone assembled in the assembly between the proximal adhesive layer and the distal adhesive layer in its compressed state of relaxation due to the tensile force created by the elastic elements, while the zone assembled in the assembly has hollow folds, in which the elastic elements are not attached to the sheets of the side panel; the side panel further comprises a plurality of intermediate fixing parts that extend in the longitudinal direction of the absorbent assembly, which are located between the proximal adhesive layer and the distal adhesive layer and in which two sheets of the side panel are attached to each other; each of the folds is formed between laterally adjacent intermediate locking parts and extends across a plurality of elastic elements; and the absorbent set has, in its top view, its each lateral edge portion located on the side panel region assembled in the assembly, the side sheet is attached to the side panel by means of a fixing part, the side panel is attached to the bottom sheet by means of a fixing adhesive layer, the proximal adhesive layer overlaps both the fixing portion and the fixing adhesive layer in the thickness direction. 2. The disposable diaper according to claim 1, wherein the zone assembled into assemblies has a subzone with low assemblies and a subzone with high assemblies and a fold in the subzone with high assemblies has a fold height of 0.5 to 3 mm. 3. The disposable diaper according to claim 1, wherein the distance between the laterally adjacent intermediate locking parts is shorter in the area closer to the proximal adhesive layer than in the area closer to the distal adhesive layer; in a compressed state of relaxation, the assembled zone is divided into a low-assembly subzone closer to the proximal adhesive layer and a high-assembly subzone closer to the distal adhesive layer, while the low-assembly subzone has a relatively small fold height and subzone with high assemblies has a relatively greater height of the folds; and each lateral edge portion of the absorbent assembly corresponds to a laterally distal lateral edge portion of each side sheet, while a laterally distal lateral edge portion of the side sheet is located in the sub-assembly with low assemblies in a plan view. 4. The disposable diaper according to claim 2 or 3, wherein the crease in the subband with high assemblies has a crease height of 0.5 to 3 mm. 5. A disposable diaper according to any one of paragraphs. 2, 3, in which a fold in a sub-zone with low assemblies has a fold height of 0.1 to 8 mm. 6. The disposable diaper according to any one of paragraphs. 2, 3, in which the absolute height difference (Δh) of the folds between the subband with high assemblies and the subzone with low assemblies is from 0.5 to 5 mm. 7. The disposable diaper according to claim 1, wherein each side edge portion of the absorbent kit is partially attached to the assembled area of each side panel in a plan view. 8. The disposable diaper according to claim 1, wherein the proximal or distal adhesive layer has a width of 1.5 to 15 mm. 9. The disposable diaper according to claim 1, wherein each intermediate fixing portion is narrower than the proximal adhesive layer and the distal adhesive layer, and has a width of 0.3 to 1.5 mm. 10. The disposable diaper according to claim 1, wherein, in the crease direction, which is the direction of thickness of the side panel, the height of the zones having the proximal adhesive layer and the distal adhesive layer is less than the height of the folds in the intermediate zone located between the proximal adhesive layer and the distal adhesive layer. 11. The disposable diaper according to claim 1, wherein with the side panel in a compressed state of relaxation, the ratio of the overlap area (S2) between the side sheet and the side panel area assembled in the assembly to the total area (S1) of the area assembled in the assembly, S2 / S1, ranges from 1/8 to 2/3. 12. The disposable diaper according to claim 1, wherein the side panel sheet is a nonwoven fabric, woven fabric, film or laminate of two or more of these sheet materials. 13. The disposable diaper according to claim 1, wherein each side portion of the absorbent kit corresponds to a laterally distal lateral portion of each side sheet. 14. The disposable diaper according to claim 1, wherein the side panel is attached at its laterally proximal end portion to the absorbent assembly so that it is located between the side sheet and the bottom sheet, and the lateral edge portion of the absorbent assembly corresponds to the laterally distal lateral edge portion of the side sheet. 15. The disposable diaper according to claim 1, wherein the side panel is attached at its laterally proximal end portion to a side of the non-skin surface of the bottom sheet of the absorbent assembly, and the lateral edge portion of the absorbent assembly corresponds to the lateral edge portion of the bottom sheet. 16. The disposable diaper according to claim 1, wherein the side sheet is formed of a single sheet, impermeable to liquids, and each of the opposite side portions of the side sheet is folded toward the side of its surface not facing the skin, so that the side sheet has a two-layer structure. 17. The disposable diaper according to claim 1, wherein the fastening tape is attached to the laterally distal end portion of the side panel, the fastening tape comprises a base sheet and an attachment element located on a portion of the base sheet distal in the lateral direction, the attachment element having a plurality of protrusions for interaction, the fastening tape is rectangular in its expanded state, and a bonding tape is formed by making the base sheet having the same shape in a plan view as the bonding tape, and attaching an element for attaching to the lateral-distal portion of the base sheet. 18. The disposable diaper according to claim 1, wherein the absorbent kit has an elongated rectangular shape and is divided into a front portion placed on the front side of the carrier in use, a rear portion placed on the rear side of the carrier in use, and a crotch portion located on the crotch media when used. 19. The disposable diaper according to claim 1, wherein the bottom sheet is a composite sheet consisting of a liquid-impermeable or liquid-impermeable non-permeable sheet, an external adhesive layer and an outer sheet of nonwoven material attached to a non-skin surface seepage-free sheet by means of an outer adhesive layer. 20. The disposable diaper according to claim 1, having a cuff that prevents leakage, and assemblies for the legs.

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