JP4971109B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper including an absorbent main body including an absorbent core and an outer packaging material bonded to the non-skin contact surface side of the absorbent main body.

  Conventionally, as shown in FIG. 9, a vertically long absorbent main body 3 including a top sheet 32, a back sheet 33, and a liquid-retaining absorbent core 34 disposed between both sheets 32 and 33, and the absorbent main body 3 and the outer packaging material 2 joined to the non-skin contact surface side, and the outer packaging material 2 has a length extending in the longitudinal direction of the main body from both longitudinal edges 3a, 3a of the absorbent main body 3. Disposable diapers are known. The outer packaging material 2 is usually configured to include an outer layer sheet 21, an inner layer sheet 22, and a plurality of elastic members 42 disposed between both sheets 21, 22. It is arranged intermittently in the longitudinal direction of the diaper, with the expansion / contraction direction matched to the diaper width direction. The outer packaging material 2 is folded back to the absorbent main body 3 side, and the skin contact surface side at the longitudinal end portion of the absorbent main body 3 is covered by the folded portion 2A of the outer packaging material 2, whereby the diaper Inconveniences such as the absorbent core 34 directly touching the wearer's skin during wearing or the absorbent polymer dropping off from the absorbent core 34 are avoided.

In the conventional disposable diaper having such a configuration, as shown in FIG. 9, an adhesive 73 is applied to substantially the entire region H of the folded portion 2A, and the constituent members of the folded portion 2A are firmly joined. It was. For this reason, the folding | returning part 2A in the conventional disposable diaper was hard to lack a softness | flexibility by the influence of the adhesive agent 73, and was hard. Since the folded part 2A is a part constituting the waist part of the diaper, if the folded part 2A is hard, there is a problem that the wearer feels uncomfortable around the waist of the wearer and a good wearing feeling cannot be obtained. there were.
Moreover, in the disposable diaper for infants in particular, there is a problem that if the folded portion 2A is hard, the waist portion is bent. Infants have a body shape in which the abdomen protrudes extremely compared to adults, and the abdominal circumference fluctuates significantly, so that the opening peripheral edge of the waist opening (tip of the waist) protrudes, especially in the sitting position while wearing a diaper It enters under the abdomen, and the peripheral edge of the opening is pressed downward from the abdomen, thereby causing the waist to bend.

In Patent Document 1, for the purpose of improving the texture of the waist part, an adhesive is linearly arranged in the longitudinal direction of the diaper and intermittent in the width direction of the diaper in the region where the non-woven sheet constituting the waist part exists. In particular, a technique for coating in stripes is described.
However, although the technique described in Patent Document 1 can improve the texture of the waist part to some extent, it cannot be said to be sufficient, and the above-described fold of the waist part was applied linearly in the diaper longitudinal direction. Since the adhesive has a high-rigidity region extending in the longitudinal direction of the diaper at the folded portion, the waist portion is still easily broken and remains unsolved.

Japanese Utility Model Publication No. 4-71922

  Therefore, the objective of this invention is providing the disposable diaper which is excellent in the softness | flexibility and texture of a waist part, and does not produce a fold of a waist part easily.

  The present invention comprises a vertically long absorbent main body including an absorbent core and an outer packaging material joined to the non-skin contact surface side of the absorbent main body, and the outer packaging material has both longitudinal ends of the absorbent main body. A disposable diaper having a length extending outward from the outer packaging material, wherein each of the portions extending outward from both longitudinal ends of the absorbent main body has a longitudinal length of the absorbent main body. In the folding line that is located outward from the edge in the direction and extends in the width direction of the main body, it is folded back to the absorbent main body side, and the skin contact at the both longitudinal ends of the absorbent main body by the folded portion of the outer packaging material A plurality of linear adhesive application portions extending in the width direction of the main body are intermittently disposed in the longitudinal direction of the main body between the outer packaging materials facing each other in the region where the folded portion is present, Between the opposing outer packaging materials through the adhesive application part Fine between the folded portion and the absorbent body is one that has achieved the above object by providing a disposable diaper are joined respectively.

  According to the disposable diaper of this invention, it is excellent in the softness | flexibility of a waist part, and a texture, and even when a person like the infant who the abdomen protrudes extremely wears, it is hard to produce a fold of a waist part.

Hereinafter, the disposable diaper of this invention is demonstrated, referring drawings based on the pants type disposable diaper which is the preferable embodiment.
As shown in FIGS. 1 to 4, the pants-type disposable diaper 1 of the present embodiment has a vertically long absorbent main body 3 including a vertically long absorbent core 34, and a non-skin contact surface side of the absorbent main body 3. And the outer packaging material 2 is divided in the longitudinal direction into an abdominal side A, a crotch C, and a back side B. A pants-type disposable diaper in which a pair of side seal parts 11, a waist opening part 12, and a pair of leg opening parts 13 are formed by joining both side edges.

  The outer packaging material 2 includes an outer layer sheet 21, an inner layer sheet 22, and a plurality of elastic members 23, 24, 25, and 26 disposed between both sheets 21 and 22. Each of 23, 24, 25, and 26 is intermittently arranged in the longitudinal direction of the main body with its expansion / contraction direction coincided with the width direction of the main body. The outer layer sheet 21 forms the outer surface of the diaper 1, and the inner layer sheet 22 is disposed on the inner surface side of the outer layer sheet 21. The waistline portion D and the waist portion F in the ventral side portion A and the back side portion B of the outer packaging material 2 are respectively provided with a waistline gather G1 and a waist gather G2 formed from the composite stretchable portion 4 (see FIG. 7). Yes.

  More specifically, the disposable diaper 1 of the present embodiment includes a liquid-permeable top sheet 32, a liquid-impermeable or water-repellent back sheet 33, and both sheets 32, 33 as shown in FIGS. A substantially vertically long absorbent main body 3 having a liquid-retaining absorbent core 34 disposed therebetween, and an outer packaging material 2 joined to the back sheet 33 side (non-skin contact surface side) of the absorbent main body 3 It has. The absorbent main body 3 is arranged across the ventral side A to the back side B of the outer packaging material 2, and the longitudinal end portion of the absorbent main body 3 is longer inward in the longitudinal direction than the longitudinal end portion of the outer packaging material 2. Have retreated. The absorptive main body 3 is bonded to the skin contact surface of the inner layer sheet 22 constituting the outer packaging material 2 by a main body bonding portion 15 such as an adhesive, a heat seal, and an ultrasonic seal.

In the present specification, the “longitudinal direction” is a direction along the long side of the disposable diaper or various members, and the “width direction” is a direction orthogonal to the longitudinal direction. The “main body longitudinal direction” is a direction along the long side of the vertically long absorbent main body 3 (vertical direction in FIG. 2), and the “main body width direction” is a direction orthogonal to the main body longitudinal direction (left and right direction in FIG. 2). It is.
The “skin contact surface” is the surface that faces the wearer's skin when wearing a diaper, and the “non-skin contact surface” is the underwear side (the side opposite to the wearer's skin) when wearing a diaper. It is the surface that is directed to.

  The outer wrapping material 2 has an hourglass shape in which both side edges are bound inward in the central portion in the longitudinal direction, and defines the outline of the diaper. The outer packaging material 2 is divided in the longitudinal direction into an abdominal side A disposed on the abdomen side of the wearer, a back side B disposed on the back side, and a crotch C positioned therebetween. The ventral side A and the back side B correspond to the longitudinal front and rear portions of the outer packaging material 2, respectively, and the crotch portion C corresponds to the longitudinal central portion of the outer packaging material 2. As for the outer packaging material 2, the both-sides edge part of the ventral | abdominal side part A and the both-sides edge part of the back side part B are mutually joined, and the waist opening part 12 and a pair of leg opening part 13 are formed in the disposable diaper 1. . By this joining, a pair of side seal parts 11 and 11 are formed on the left and right side edges of the disposable diaper 1 to form a pant-type. For this joining, heat sealing, high frequency sealing, ultrasonic sealing or the like is used.

  The top sheet 32, the back sheet 33, and the absorbent core 34 have a rectangular shape in plan view, and are integrated to form a vertically long absorbent main body 3. The total length in the longitudinal direction of the absorbent main body 3 substantially matches the total length in the longitudinal direction of the absorbent core 34, and the longitudinal ends 3 a, 3 a of the absorbent main body 3 are both longitudinal ends of the absorbent core 34 (see FIG. (Not shown). As the surface sheet 32, the back surface sheet 33, and the absorptive core 34, the thing similar to what was conventionally used for this kind of diaper can be used, respectively. For example, the absorbent core 34 may be made of absorbent polymer particles and a fiber material and covered with tissue paper (not shown). The absorbent core 34 in the present embodiment includes an hourglass-shaped central absorber and a pair of side absorbers provided symmetrically on both sides of the central absorber, and the central absorber and the pair of side absorbers. A cut-out portion having a hollow shape is formed between each side absorber. However, the shape of the absorbent core 34 in plan view is not limited to this, and can be arbitrarily set, for example, a rectangular shape, an hourglass shape, or the like.

  As shown in FIGS. 2 to 4, side cuffs 35 and 35 made of a liquid-resistant or water-repellent and breathable material are provided on both sides in the longitudinal direction of the absorbent main body 3. In the vicinity of the free end of each side cuff 35, a side cuff elastic member 36 is disposed in an expanded state. Accordingly, when the disposable diaper 1 is worn, the side cuff elastic member 36 contracts, whereby the side cuff 35 is raised, and the outflow of the liquid in the width direction of the absorbent main body 3 is prevented. As shown in FIGS. 3 and 4, the side cuff forming sheet 37 for forming the side cuff 35 has a predetermined width portion 37 </ b> A on the outer side in the width direction of the absorbent main body 3 in the developed state of the diaper. It is wound down to the skin contact surface side of 33 and is fixed between the absorbent core 34 and the back sheet 33.

  As shown in FIGS. 5 and 6, the outer packaging material 2 has a length that extends outward in the longitudinal direction of the main body from each of the longitudinal ends 3 a and 3 a of the absorbent main body 3. In the present embodiment, both the outer layer sheet 21 and the inner layer sheet 22 constituting the outer packaging material 2 have a length that extends outwardly in the longitudinal direction of the main body 3 from both longitudinal ends 3a, 3a. In addition, the length of the outer layer sheet 21 extending longer than that of the inner layer sheet 22 is longer.

Each of the outer packaging materials 2 has a longitudinal end portion [absorption indicated by a symbol L in FIG. 5] that extends outward from both longitudinal ends 3a, 3a of the absorbent main body 3. In the fold line 30 that is located outward in the longitudinal direction of the main body and extends in the width direction of the main body from its one end (the other end) 3a in the longitudinal direction of the absorbent main body 3), it is folded back to the absorbent main body 3 side. As shown in FIG. 2 and FIG. 6, the skin contact surface side at both longitudinal ends of the absorbent main body 3 is covered with the folded portions 2 </ b> A and 2 </ b> A of the material 2.
As shown in FIG. 2, the region H where the folded portion 2A exists extends over the entire area of the waist portion F and a part of the waistline portion D. The folding line 30 substantially coincides with the peripheral edge 12 a of the waist opening, and the bent part 2 </ b> B of the outer packaging material 2 including the folding line 30 constitutes the opening peripheral part of the waist opening 12.

In the present embodiment, the folded portion 2A is composed of a folded portion 21A of the outer layer sheet 21 and a folded portion 22A of the inner layer sheet 22, as shown in FIG. The contact surface side is covered only by the folded portion 21 </ b> A of the outer layer sheet 21. The folded portion 22A of the inner layer sheet 22 is located on the outer side in the longitudinal direction of the main body with respect to the longitudinal direction one end (the other end) 3a of the absorbent main body 3.
Thus, the skin contact surface side at both longitudinal ends of the absorbent main body 3 is covered with the folded portion 2A of the outer packaging material 2 (in this embodiment, the folded portion 21A of the outer layer sheet 21), thereby absorbing the skin. It can prevent that the longitudinal direction both ends of the main body 3 contact a wearer directly, and can prevent the absorption polymer of the absorptive core 34 from the longitudinal direction both ends of the absorptive main body 3 from leaking.

  The folding line 30 is arranged between the outer layer sheet 21 and the inner layer sheet 22 in a state where the outer packaging material 2 (the outer layer sheet 21 and the inner layer sheet 22) extends in the longitudinal direction of the main body without being folded back as shown in FIG. Among the plurality of elastic members 23, 24, 25, 26, a sheet that constitutes the outer packaging material 2 on the outer side in the main body longitudinal direction than the elastic member 24 (waist elastic member 24) located most outward in the main body longitudinal direction Among them, the sheet (inner layer sheet 22) having the shortest length along the longitudinal direction of the main body is positioned inward in the longitudinal direction of the main body from one end (the other end) in the main body longitudinal direction. The folding line 30 is preferably located 30 to 50 mm, particularly 35 to 45 mm away from the longitudinal direction one end (the other end) 3 a of the absorbent body 3 outward in the longitudinal direction of the body.

As shown in FIGS. 5 and 6, between the opposing outer packaging materials in the region H where the folded portion 2A exists (between the folded portion 2A and the portion facing the folded portion 2A in the outer packaging material 2), as shown in FIGS. A plurality of linear adhesive application portions 70 and 71 extending in the width direction of the main body are intermittently arranged in the longitudinal direction of the main body, and between the opposing outer packaging materials via the adhesive application portions 70 and 71. The folded portion 2A and the absorbent main body 3 are joined to each other. The adhesive application portions 70 and 71 are formed by applying an adhesive such as a hot-melt adhesive at a predetermined location. In the present embodiment, the adhesive application portions 70 and 71 are linear in a plan view. Adhesive is applied between adjacent adhesive application parts (between a plurality of adhesive application parts 70, between a plurality of adhesive application parts 71, and between the adhesive application part 70 and the adhesive application part 71). It is an adhesive non-application part which is not done.
As described above, a plurality of linear adhesive application portions 70 and 71 extending in the width direction of the main body are employed as the adhesive application portion for fixing the folded portion 2A of the outer packaging material 2, and the adhesive application portion 70 is used. , 71 are intermittently arranged in the longitudinal direction of the main body, so that the flexibility of the waist portion F is greater than when the adhesive 73 is applied to substantially the entire region H of the folded portion 2A as shown in FIG. And a texture improves and a diaper with a favorable feeling of wear is obtained.

In particular, when the wearer of the diaper 1 has a body shape in which the abdomen protrudes extremely like an infant, the waist opening peripheral edge 12a enters under the protruding abdomen, and the abdomen The conventional diaper has a problem that the waist portion F bends to the outer surface side of the diaper due to the compression.
On the other hand, as in this embodiment, as the adhesive application pattern in the waist portion F, a plurality of linear adhesive application portions 70 and 71 extending in the main body width direction are intermittently arranged in the main body longitudinal direction. By adopting the pattern, even if the waist opening peripheral edge 12a is pressed downward by the protruded abdomen, the adhesive is not applied to the waist F and the sheet (outer packaging material 2) originally has. The adhesive non-applied part, which is not damaged, is intermittently arranged in the compression direction, so that the compression force can be relaxed, thereby preventing the waist part F from being broken. be able to.
On the other hand, the adhesive application pattern in the waist part F is a pattern as described in Patent Document 1, that is, a plurality of linear adhesive application parts extending in the longitudinal direction of the main body are intermittently arranged in the main body width direction. In the case of the pattern, a high-rigidity region corresponding to the adhesive application portion extending in the longitudinal direction of the main body is generated in the waist portion F. Therefore, it is possible to sufficiently relieve the compression force applied to the waist portion F from above. The waist part F is easy to bend.

From the viewpoint of further improvement in flexibility and texture, the bent portion 2B of the outer packaging material 2 including the folding line 30, that is, the opening peripheral portion of the waist opening 12 including the waist opening peripheral edge 12a (the tip of the waist portion F) Part) is preferably configured to include a laminate of four or more layers of nonwoven fabric.
In the present embodiment, as will be described later, the outer layer sheet 21 and the inner layer sheet 22 constituting the outer packaging material 2 are both made of non-woven fabric, and as described above, these two sheets 21 and 22 are in the folding line 30. Since the folded part 2B and the folded part 2A connected to the folded part 2B are formed by folding back to the absorbent main body 3 side, the folded part 2B includes a laminate of four layers of nonwoven fabric as shown in FIG. With this configuration, the flexibility and texture of the opening peripheral edge of the waist opening 12 are further improved.
From the viewpoint of surely achieving the above effect, a region of 10 mm or less, particularly 5 mm or less downward from the waist opening peripheral edge 12a (inward from the folding line 30 in the main body longitudinal direction) is a laminate of four or more layers of nonwoven fabric. It is preferable that it is comprised.

As described above, the plurality of linear adhesive application portions arranged between the facing outer packaging materials in the region H where the folded portion 2A exists are bounded by one end (the other end) 3a in the longitudinal direction of the absorbent main body 3. As shown, the adhesive application part 70 located outward in the longitudinal direction of the main body and the adhesive application part 71 located inward are included.
As shown in FIG. 6, the adhesive application part 70 joins the outer packaging materials facing each other in the region H where the folded part 2 </ b> A exists, and the adhesive application part 71 is formed between the folded part 2 </ b> A and the absorbent main body 3. The skin contact surface side at both ends in the longitudinal direction is joined.

  A plurality of adhesive application sections 70 and 71 are provided (three in each of FIGS. 5 and 6). The length along the main body width direction of each of the adhesive application portions 70 and 71 is preferably 70 to 100% with respect to the length along the main body width direction of the outer packaging material 2 (maximum width of the outer packaging material 2). More preferably, it is 80 to 100%. In this embodiment, this ratio is 100%, and all of the adhesive application portions 70 and 71 are continuously arranged over the entire width of the portion having the maximum width of the outer packaging material 2.

The width (length along the longitudinal direction of the main body) of the adhesive application part 70 is preferably 1 to 10 mm, and more preferably 2 to 6 mm.
The width | variety of the adhesive application part 71 becomes like this. Preferably it is 1-10 mm, More preferably, it is 2-6 mm.
The width of the adhesive application part 70 and the width of the adhesive application part 71 may be the same or different.

  When the width of the adhesive application part 70 and the width of the adhesive application part 71 are different, the adhesive application part 71 is wider than the adhesive application part 70 so that the longitudinal end of the absorbent body 3 This is preferable in that the portion is reliably covered. In this case, the ratio (W1 / W2) of the width W1 of the adhesive application part 70 and the width W2 of the adhesive application part 71 is preferably 0.25 to 1, and more preferably 0.4 to 1.

The arrangement pitch P4 of the plurality of adhesive application portions 70 is preferably 1 to 10 mm, more preferably 2 to 5 mm.
The arrangement pitch P5 of the plurality of adhesive application portions 71 is preferably 1 to 6 mm, and more preferably 1 to 4 mm.
The interval P6 between the adjacent adhesive application part 70 and the adhesive application part 71 is preferably 3 to 15 mm, more preferably 5 to 10 mm.
P4, P5, and P6 may all be the same value, some may be the same value, or all may be different values.

In the present embodiment, no adhesive is applied to the bent portion 2 </ b> B of the outer packaging material 2 including the folding line 30. That is, as shown in FIG. 6, the adhesive is not substantially applied to the opening peripheral portion (the front end portion of the waist portion F) of the waist opening portion 12 including the waist opening peripheral edge 12 a. Here, “substantially no adhesive is applied” means not only when no adhesive is applied, but also when a small amount of adhesive is applied (adhesive application amount is preferably 1 g). / M ² or less). With such a configuration, the flexibility and texture of the front end portion of the waist portion F are further increased, and the feeling of wearing the diaper can be further improved, and the feeling felt by the mother wearing the diaper can also be improved.
From the viewpoint of ensuring the above effects, the outer packaging material 2 (the outer layer sheet 21 and the inner layer sheet 22) extends in the longitudinal direction of the main body without being folded as shown in FIG. It is preferable that the adhesive is not substantially applied to a region within 10 mm, particularly within 5 mm in each of the outer side and the outer side (vertical direction in FIG. 5).

In the present embodiment, as shown in FIG. 6, the adhesive is substantially applied to the leading end 2 </ b> Aa of the folded portion 2 </ b> A (in this embodiment, the leading end 21 </ b> Aa of the folded portion 21 </ b> A of the outer layer sheet 21). Absent. Here, “substantially no adhesive is applied” means not only when no adhesive is applied, but also when a small amount of adhesive is applied (adhesive application amount is preferably 1 g). / M ² or less). With such a configuration, the tip portion 2Aa of the folded portion 2A is not hardened by the adhesive, and the wearing feeling can be further improved.
From the viewpoint of ensuring the above effects, it is preferable that the adhesive is not substantially applied to a region within 20 mm, particularly within 10 mm, in the longitudinal direction of the main body from the tip of the folded portion 2A of the outer packaging material 2.

  Examples of a preferable application form of the adhesive in the region H where the folded portion 2A exists (forms of the adhesive application parts 70 and 71) include the following adhesive application forms.

Adhesive application mode: The plurality of adhesive application portions 70 and 71 have the same width, and a plurality of adhesives positioned outward in the longitudinal direction of the main body from one longitudinal end (the other end) 3a of the absorbent main body 3 The arrangement pitch P4 of the application part 70 is larger than the arrangement pitch P5 of the plurality of adhesive application parts 71 located inward in the longitudinal direction of the main body from the one end (other end) 3a in the longitudinal direction.
By adopting the adhesive application mode, the original role of the folded portion 2A (prevention and absorption of the absorbent core 34 directly against the diaper wearer's skin is obtained without impairing the above-described folding prevention effect of the waist F. It is possible to prevent the release of the functional polymer from the absorbent core 34. Moreover, the moldability of the collar 43 of the composite elastic part 4 to be described later can be kept better.
In the adhesive application mode, the ratio (P4 / P5) between the arrangement pitch P4 and the arrangement pitch P5 is preferably 1 to 5, and more preferably 1 to 3.

At least in the vicinity of the region H where the folded portion 2A exists, the elastic members adjacent to each other between the outer layer sheet 21 and the inner layer sheet 22 except for both end portions in the width direction (both end portions in the body width direction) 2b, 2b of the outer packaging material 2. It is preferable that the adhesive is not substantially applied between the gaps (between the plurality of elastic members 23). Here, “in the vicinity of the region where the folded portion is present” is a region within 30 mm from the front end 2Aa of the folded portion 2A in the longitudinal direction of the main body. Further, “substantially no adhesive is applied” means not only when no adhesive is applied, but also when a small amount of adhesive is applied (adhesive application amount is preferably 1 g / m ² or less).
Since the adhesive is not substantially applied between the elastic members adjacent to each other between the outer layer sheet 21 and the inner layer sheet 22 in such a region, the flexibility of the waist portion F and the texture can be further improved. The bending of the waist part F can be prevented more effectively.

  As described above, the adhesive is between the elastic members adjacent to each other between the outer layer sheet 21 and the inner layer sheet 22 at both ends 2b and 2b in the width direction of the outer packaging material 2 in the vicinity of the region H where the folded portion 2A exists. It is substantially applied, thereby forming an application part (not shown) having a predetermined width. The width of the application part (length along the main body width direction of the application part) is preferably 5 to 15 mm. Further, in the present embodiment, the application portion is formed not only in the vicinity of the existence region H of the folded portion 2A but also in the existence region H, and is formed over the waistline portion D and the waist portion F. Yes.

Further, in the existence area H of the folded portion 2A in the present embodiment, excluding the existence area of the absorbent main body 3 (area where the absorbent main body 3 is disposed) and the widthwise both ends 2b and 2b of the outer packaging material 2 Adhesive agent between adjacent elastic members between the outer layer sheet 21 and the inner layer sheet 22 (between the plurality of elastic members 23, between the plurality of elastic members 24, and between the elastic member 23 and the elastic member 24). Is not substantially applied. Here, “substantially no adhesive is applied” means not only when no adhesive is applied, but also when a small amount of adhesive is applied (adhesive application amount is preferably 1 g). / M ² or less).
Since the adhesive is not substantially applied between the elastic members adjacent to each other between the outer layer sheet 21 and the inner layer sheet 22 in such a region, the flexibility of the waist portion F and the texture can be further improved. The bending of the waist part F can be prevented more effectively.

  On the other hand, an adhesive may be applied to the elastic members 23, 24, 25, and 26 disposed between the outer layer sheet 21 and the inner layer sheet 22. That is, an adhesive is applied to an elastic member disposed between the outer layer sheet 21 and the inner layer sheet 22, and the elastic member and each of the outer layer sheet 21 and the inner layer sheet 22 are joined by the adhesive. May be. Even if such a form is adopted, satisfactory results can be obtained in terms of flexibility and texture of the waist portion F and prevention of breakage of the waist portion F.

In the present embodiment, the outer layer sheet 21 and the inner layer sheet 22 are substantially the entire region corresponding to the composite stretchable portion 4 described later (the region where the waistline gather G1 and the waist gather G2 are formed) and the region corresponding to the crotch part C. In substantially the whole area, the parts are partially joined to each other by heat fusion without using an adhesive. Therefore, the adhesive is not applied between the adjacent elastic members between the sheets 21 and 22 in such a region.
Moreover, in this embodiment, the elastic members 23 and 24 distribute | arranged to the area | region corresponding to the composite expansion-contraction part 4 mentioned later among the several elastic members distribute | arranged between both the sheets 21 and 22 are mentioned above. As described above, both the sheets 21 and 22 are bonded only in both ends in the length direction (the width direction both ends 2b and 2b of the outer packaging material 2) and the region where the absorbent main body 3 exists in the region H where the folded portion 2A exists. Since the adhesive is fixed by the agent and no adhesive is applied to the other portions, the amount of the adhesive used between the sheets 21 and 22 is considerably reduced as compared with the prior art. Such a form with a small amount of adhesive used is preferable in terms of air permeability and moisture permeability.

The disposable diaper 1 of this embodiment is further explained in full detail.
Waist gathers G <b> 2 are provided in the waist portions F of the ventral side A and the back side B of the outer packaging material 2. The waist portion F refers to a region from the peripheral edge 12a of the waist opening 12 to a position spaced 30 mm downward, for example, the position of the peripheral edge 12a of the abdominal waist opening 12 and the back waist opening. In the case where the position of the peripheral edge 12a of 12 is shifted (not shown), the range of the waist portion F is determined on the assumption that there is no shifted and extended region.

  A plurality of waist elastic members (elastic members) 24 are arranged along the peripheral edge of the waist opening 12 in the waist F of each of the ventral side A and the back side B. A composite stretchable part 4 (details will be described later) is formed mainly of the outer layer sheet 21, the inner layer sheet 22 and the waist elastic member 24. The composite stretchable part 4 extends between the pair of side seal parts 11. A waist gather G2 is formed (over the entire circumference of the waist portion F).

  The outer packaging material 2 is provided with a leg gather G3 along a pair of leg openings 13. More specifically, a plurality of leg elastic members (elastic members) 25 are arranged along each peripheral edge of the leg opening 13 curved in the crotch part C. The leg elastic member 25 is fixed in an extended state between the outer layer sheet 21 and the inner layer sheet 22 via an adhesive. Thereby, a leg gather G3 is formed along the leg opening 13.

  A waistline gather D1 formed of a composite stretchable part 4 (details will be described later) is provided on the waistline part D of the abdomen A and back side B of the outer packaging material 2. The waistline portion D is a region from the lower portion of the waist portion F to the upper end of the leg opening 13. The waistline portion D will be described in detail. The waistline portion D is provided with a plurality of waistline elastic members (elastic members) 23 along the width direction. The waistline elastic member 23 extends between the vicinity of the side edge of the absorbent main body 3 and the side seal portion 11, and is not disposed between the vicinity of the side edge of the absorbent main body 3.

  And the composite elastic part 4 is formed mainly by the outer layer sheet 21, the inner layer sheet 22, and the waistline elastic member 23. By this composite elastic part 4, the vicinity of the side edge part of the absorbent main body 3 and the side seal part 11 are formed. A pair of waistline gathers G1 arranged in the width direction is formed in the width direction. The waistline gather G1 is not disposed between the side edge portions of the absorbent main body 3. The “near side edge of the absorbent main body 3” refers to a region within 30 mm inward in the width direction and within 20 mm outward in the width direction from the side edge of the absorbent main body 3.

  The front crotch portion E will be described. The front crotch portion E refers to the foremost region when the crotch portion C is divided into four in the longitudinal direction. In the front crotch part E, a plurality of front crotch elastic members (elastic members) 26 are arranged over the entire width direction. The front crotch elastic member 26 is fixed in an extended state between the outer layer sheet 21 and the inner layer sheet 22 via an adhesive. Thus, a front crotch gather G4 is formed in the front crotch part E.

  As shown in FIG. 3, a non-functionalized region 51 that prevents the elastic member from contracting is formed in a region of the outer packaging material 2 facing the absorbent main body 3. The non-functionalized region 51 in the present embodiment is formed without expressing the contraction force of the waistline elastic member 23 and the front crotch elastic member 26. The non-functionalized region 51 is formed in the material state without partially expressing the contraction force with respect to the waistline elastic member 23 and the front crotch elastic member 26 disposed over the entire width direction of the outer packaging material 2. It is an area. In order to prevent the contraction force from appearing, for example, a large number of convex portions and cutter blades that divide the elastic member, a large number of emboss pins that harden the elastic member by heat sealing, and the like are used.

By forming the non-functionalized region 51, a pair of waistline gathers G1 separated in the width direction from the waistline elastic member 23 and the front crotch elastic member 26 disposed over the entire width direction of the outer packaging material 2 and A front crotch gather G4 is formed.
The non-functionalized region 51 located between the pair of waistline gathers G1 in the width direction is formed without causing the partial contraction force of the waistline elastic member 23 joined to the outer layer sheet 21 and the inner layer sheet 22 to be expressed. In contrast, the non-functionalized region 51 positioned between the pair of front crotch gathers G4 in the width direction is the front crotch elastic member 26 joined to the outer layer sheet 21 and the inner layer sheet 22. A part of the contraction force is not expressed. Thereby, shrinkage | contraction of the absorptive main body 3 can be prevented, and the favorable external appearance and absorption performance of the absorptive main body 3 can be implement | achieved.

A leg elastic member cutting region 52 is formed at a position that is the center of the crotch C in the width direction. The leg elastic member cutting region 52 is a position that becomes the central portion in the width direction of the crotch part C with respect to the continuous body 25S of the leg elastic member 25 disposed in a curved shape over the entire width direction of the outer packaging material 2 in the raw material state. This is the area cut by. In order to form the leg elastic member cutting region 52, for example, a large number of convex portions and cutter blades that divide the elastic member are used.
By forming the leg elastic member cutting region 52, the width in the center of the crotch part C in the width direction is increased from the continuous body 25S of the leg elastic member 25 arranged in a curved shape over the entire width direction of the outer packaging material 2. A pair of leg elastic members 25, 25 separated in the direction is formed.

In the present embodiment, the crotch part C of the outer packaging material 2 is not provided with a composite stretchable part 4 described later. Thereby, the urine excreted in front of the absorbent main body 3 can be smoothly transferred to the rear, and the absorption performance is remarkably improved.
As the leg elastic member 25 and the front crotch elastic member 26, elastic materials such as natural rubber, polyurethane resin, foamed urethane resin, and hot-melt elastic member are formed into a thread shape (thread rubber) or a belt shape (flat rubber), respectively. Those formed are preferably used.

Next, the composite elastic part 4 which forms the waistline gather G1 and the waist gather G2 in this embodiment is explained in full detail. As shown in FIGS. 7 and 8, the composite stretchable part 4 has the following configurations (1) to (3).
(1) The outer layer sheet 21 and the inner layer sheet 22 are joined to each other by an intermittent joining portion 41 in the stretching direction (X direction) of the composite stretchable portion 4 and the direction (Y direction) perpendicular thereto.
(2) The elastic member 42 is arranged so as not to pass through the joint portion 41, and is not fixed to the outer layer sheet 21 and the inner layer sheet 22 in a portion excluding both end portions in the length direction of the elastic member 42.
(3) Each of the outer layer sheet 21 and the inner layer sheet 22 forms a plurality of ridges 43 extending continuously over a plurality of elastic members 42.

  In the composite stretchable part 4 that forms the waist gather G2 and the composite stretchable part 4 that forms the waistline gather G1, which are adjacent to the longitudinal direction of the absorbent main body 3, the plurality of ridges 43 are orthogonal to the stretch direction of the composite stretchable part 4. It is continuous over the entire direction. As described above, when the flange 43 extends over the entire region orthogonal to the expansion / contraction direction of the composite expansion / contraction part 4, the side part in the diaper width direction [the region between the side edge of the absorbent main body 3 and the side seal part 11 ( However, the side seal portion 11 itself is not included)], and the appearance, cushioning properties and air permeability are excellent.

  In the present embodiment, the composite stretchable part 4 that forms the waist gather G2 and the composite stretchable part 4 that forms the waistline gather G1 that are adjacent to each other in the longitudinal direction of the absorbent main body 3 are as described above. Although it distribute | arranges in the width direction between the side edge part vicinity and the side seal part 11, it is not distribute | arranged between the side edge part vicinity of the absorptive main body 3. FIG. In other words, the waistline gather G1 is not provided between the side edge portions of the absorbent main body 3, and only the waist gather G2 is provided.

  In the present embodiment, the waistline gather G1 formed from the composite stretchable part 4 is composed mainly of the outer layer sheet 21, the inner layer sheet 22, and the waistline elastic member 23, and the waist gather G2 formed from the composite stretchable part 4. Is mainly composed of an outer layer sheet 21, an inner layer sheet 22, and a waist elastic member 24. Thus, although the elastic member which comprises it changes with gathers, in the following description of the composite expansion-contraction part 4, the elastic member which comprises the composite expansion-contraction part 4 is demonstrated as the "elastic member 42".

  In the composite stretchable part 4, it is preferable that all the elastic members 42 do not pass through all the joints 41. However, for example, some elastic members 42 are part of the joints 41 due to manufacturing errors. May pass through. Even if some elastic members 42 pass through some of the joint portions 41, the effects of the present invention are sufficiently achieved. Therefore, when the elastic member 42 does not pass through 70% (pieces / pieces) or more of the joint portions 41 provided in the composite stretchable portion 4, the elastic member 42 does not pass through the joint portion 41. It shall be comprised as follows.

As shown in FIGS. 7 and 8, the outer layer sheet 21 and the inner layer sheet 22 constituting the composite stretchable part 4 are respectively in the stretch direction (X direction) of the composite stretchable part 4 and the direction (Y direction) orthogonal thereto. The joints 41 are intermittently joined together. The joint portion 41 is preferably formed by heat sealing.
The plurality of elastic members 42 are arranged in parallel to each other, and are arranged so as to extend along the longitudinal direction of the composite stretchable part 4. When a plurality of elastic members 42 are arranged in parallel to each other as in the present embodiment, the expansion / contraction direction of the composite expansion / contraction part 4 is the same direction as the direction in which the elastic member 42 extends. When the plurality of elastic members 42 are not arranged in parallel to each other, the expansion / contraction direction of the composite expansion / contraction part 4 is in the direction in which the flange 43 extends in a flange 43 (described later) extending over the plurality of elastic members 42. The direction is orthogonal.

  FIG. 8 is a diagram illustrating an arrangement pattern of the joint portions 41. The joint portions 41 are formed so as to form rows in the stretching direction (X direction) of the composite stretchable portion 4 and the direction (Y direction) perpendicular thereto, and the joint portions 41 constituting the row in the perpendicular direction are formed. It is formed between each elastic member 42. In a natural state (a state in which no external force is applied), the elastic member 42 contracts, and each of the outer layer sheet 21 and the inner layer sheet 22 continuously extends over the plurality of elastic members 42. (Gather) 43 is formed. In the present embodiment, one ridge 43 is formed between the joint portions 41, 41 adjacent to each other in the expansion / contraction direction (X direction) of the composite expansion / contraction portion 4.

  From the viewpoint of reliably forming the flanges 43 extending continuously over the plurality of elastic members 42, the pitch P <b> 2 of the joint portions 41 in the expansion / contraction direction (X direction) of the composite expansion / contraction portion 4 when the composite expansion / contraction portion 4 extends. (See FIG. 8) is preferably 1 to 20 mm, particularly 3 to 10 mm, and the length L2 (see FIG. 8) of each joint 41 is 0.1 to 5 mm, particularly 0.2 to 1.5 mm. It is preferable that The ratio (P2 / L2) between the pitch P2 and the length L2 is preferably 1.1 to 200, particularly 2 to 50.

  In the composite stretchable part 4, the pitch P3 (see FIG. 8) of the joints 41 in the direction (Y direction) orthogonal to the stretch direction is preferably 1 to 40 mm, particularly 2 to 15 mm. The length L3 (see FIG. 8) is preferably 0.5 to 20 mm, particularly 1 to 10 mm. The ratio (P3 / L3) between the pitch P3 and the length L3 is preferably 1.05 to 80, particularly 1.05 to 15.

  In the composite stretchable part 4, the outer layer sheet 21 and the inner layer sheet 22 are preferably not joined to each other at a part other than the joint part 41. Each elastic member 42 is disposed in the composite stretchable part 4 so as not to pass through the joint part 41 between the outer layer sheet 21 and the inner layer sheet 22, and the outer layer sheet 21 and the inner layer sheet are excluded from the portions excluding both ends of the elastic member 42. 22 is not fixed. That is, each elastic member 42 is fixed to the outer layer sheet 21 and the inner layer sheet 22 only at both ends thereof.

  Both end portions of the elastic member 42 are fixed between the outer layer sheet 21 and the inner layer sheet 22 in a state sandwiched between the outer layer sheet 21 and the inner layer sheet 22 at both end portions 44 (only one is shown) of the composite stretchable portion 4. Yes. Both end portions 44 of the composite stretchable portion 4 differ depending on the gathers formed thereby. In the embodiment shown in FIG. 1, both end portions 44 of the composite stretchable part 4 that forms the waistline gather G1 are the vicinity of the side edge of the absorbent main body 3 and the side seal part 11, and the composite stretchable part that forms the waist gather G2. Both end portions 44 of the portion 4 are both side seal portions 11, 11. In addition, you may form the both ends 44 of the composite expansion-contraction part 4 so that expansion-contraction is possible.

  Each ridge 43 in the outer layer sheet 21 and the inner layer sheet 22 is formed so as to protrude from both surfaces of the composite stretchable portion 4, and a convex curved surface having an arcuate cross section is formed at the tip in the protruding direction of each ridge 43. Has been. The convex curved surface continuously extends in a direction (Y direction) orthogonal to the expansion / contraction direction of the composite expansion / contraction part 4. In the present embodiment, one ridge 43 is formed between the joint portions 41, 41 adjacent to each other in the expansion / contraction direction (X direction) of the composite expansion / contraction portion 4, and these ridges 43 are elastic members 42. Without being divided at the overlapping portion, and continuously extending in the direction (Y direction) orthogonal to the expansion / contraction direction of the composite expansion / contraction part 4.

  The elastic member 42 is introduced between the outer layer sheet 21 and the inner layer sheet 22 in a stretched state of preferably 120 to 1100%, particularly preferably 150 to 500%, and the outer layer sheet 21 does not overlap the elastic member 42. And the inner layer sheet 22 are joined. Then, the elastic member 42 contracts, the contracted portions of the outer layer sheet 21 and the inner layer sheet 22 remain, and the remaining outer layer sheet 21 and inner layer sheet 22 extend in the direction opposite to the bonding surface of the joint portion 41 (outside). (Ii) The ridge 43 is formed by deforming into a convex cross section.

  In the composite stretchable part 4 in this embodiment, each of a large number of ridges 43, 43 formed by contraction of the elastic member 42 extends continuously in a direction (Y direction) perpendicular to the stretchable direction of the composite stretchable part 4. So it looks very beautiful.

Moreover, the composite elastic part 4 in this embodiment can prevent the increase in rigidity, and the degree of freedom of deformation of the flange 43 with respect to external force is improved. The prevention of the increase in rigidity and the improvement of the degree of freedom of deformation of the flange 43 are such that the elastic member 42 is formed between the valley between the flange 43 and the flange 43 in the outer layer sheet 21 and the flange 43 and the flange 43 in the inner layer sheet 22. It exists in a state of being sandwiched between the valleys between them, and is present in a state where it is not joined to any of the outer layer sheet 21 and the inner layer sheet 22 including the portion sandwiched between those valleys. In addition, the outer layer sheet 21 and the inner layer sheet 22 in the composite stretchable part 4 are not continuously joined in any direction of the stretchable direction (X direction) of the composite stretchable part 4 and the direction (Y direction) perpendicular thereto. Is based on that.
Furthermore, a volume is generated in the thickness direction of the outer layer sheet 21 and the inner layer sheet 22 due to a synergistic effect with the tip part of the collar 43 forming a convex curved surface, and the touch when the surface of the composite stretchable part 4 is touched. Is very soft and very soft to the touch.

  Moreover, since the elastic member 42 in the composite stretchable part 4 is present in a state where it is not joined to the outer layer sheet 21 and the inner layer sheet 22, the amount of hot melt adhesive used can be suppressed to zero or a small amount. In particular, as in the present embodiment, when the outer layer sheet 21 and the inner layer sheet 22 are joined to each other by the joining portion 41 by heat fusion, the effect of reducing the amount of adhesive used is more remarkable. Since the amount of hot-melt adhesive used is small, air permeability and moisture permeability are not impaired.

The material for forming the composite stretchable part 4 in this embodiment will be described.
As the outer layer sheet 21 and the inner layer sheet 22, air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, meltblown nonwoven fabric, spunbond and meltblown are used from the viewpoint of forming a flexible ridge 43 having a beautiful appearance and good touch. It is preferable that the composite non-woven fabric is superposed.

The thickness of the outer layer sheet 21 under no load is preferably 0.25 to 2.0 mm, more preferably 0.3 to 1.0 mm. When the thickness of the outer layer sheet 21 is too thin, the ridges 43 are easy to be sharpened, and the plump ridges 43 are difficult to obtain. On the other hand, when the thickness of the outer layer sheet 21 is too thick, the cross-sectional shape of the ridge 43 does not become a beautiful curved shape, and the ridge 43 tends to be sharp.
The thickness of the inner layer sheet 22 under no load is preferably 0.1 to 1.5 mm, and more preferably 0.1 to 1.0 mm.
Further, as described above, non-woven cloth is preferably used as the outer layer sheet 21 and the inner layer sheet 22. The basis weight of the nonwoven fabric is preferably 5 to 50 g / m ² , particularly preferably 10 to 30 g / m ² .

  In addition, the outer layer sheet 21 and the inner layer sheet 22 are made of a heat-fusible resin from the viewpoint of facilitating joining by heat-sealing (formation of the joining portion 41). Is preferred. Examples of the heat-fusible resin include polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET). The fiber may be a core-sheath type composite fiber whose sheath is made of a heat-fusible resin.

The outer layer sheet 21 is required to have a texture and orientation of the sheet from the viewpoint of improving the texture and appearance of the outer packaging material 2 (concealment by integration with the elastic member 42). Therefore, an air-through nonwoven fabric manufactured by an air-through method is suitable for the outer layer sheet 21. Particularly preferred is an air-through nonwoven fabric made of polyethylene and polyethylene terephthalate.
The inner layer sheet 22 is required to have the strength of the outer packaging material 2, particularly the breaking strength when stretched. Therefore, a spunbond nonwoven fabric manufactured by a spunbond method is suitable for the inner layer sheet 22. Particularly preferred is a spunbonded nonwoven fabric made of polyethylene and polyethylene terephthalate.

  As a material for forming the elastic member 42 in the composite stretchable part 4, various known elastic materials used for absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. Examples of the elastic material include synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, and polyurethane. As the form of the elastic member 42, a thread-like (thread rubber etc.) or string-like (flat rubber etc.) having a cross section of a rectangle, square, circle, polygon or the like, or a multifilament type thread-like one or the like is used. it can.

According to the pants-type disposable diaper 1 of the present embodiment having the above-described configuration, it extends in the body width direction as an adhesive application pattern in the region H of the folded portion 2A of the outer packaging material 2 that is a constituent member of the waist portion F. Since a pattern formed by intermittently arranging a plurality of linear adhesive application portions 70 and 71 in the longitudinal direction of the main body is adopted, the waist portion F is excellent in flexibility and texture, has a good wearing feeling, and has a waist. It is difficult for the part F to be broken. Further, as described above, by providing the outer packaging material 2 with the gathers G1 and G2 formed from the composite stretchable portion 4, the material of the composite stretchable portion 4 can be made soft and flexible due to the original texture and softness of the material. The texture, the feeling of wearing and the folding of the waist are further improved.
Moreover, according to the diaper 1 of this embodiment, since the skin contact surface side in the longitudinal direction both ends of the absorptive main body 3 is coat | covered with the folding | turning part 2A of the outer packaging material 2, this longitudinal direction both ends are a wearer. It is possible to effectively prevent the leakage of the absorbent polymer from the both ends in the longitudinal direction of the absorbent core 34.

Moreover, according to the diaper 1 of the present embodiment, the following effects are further exhibited in addition to the effects described above mainly by the action of the composite stretchable portion 4.
That is, the waist gather G1 and the waist gather G2 are formed from the composite stretchable part 4, and the stretchability of the gather can be expressed without substantially using a hot melt adhesive. And the breathability in the back side part B is excellent. Moreover, the raw material original texture of the outer-layer sheet 21 and the inner-layer sheet 22 of the outer packaging material 2 can be utilized, and it is soft and not stiff.

  Moreover, in the composite elastic part 4, since the contraction force of the elastic member 42 is not inhibited at all (or almost), the contraction force is utilized to the maximum. For example, when the expansion / contraction characteristics are graphed by taking the circumference of the waistline D on the horizontal axis and the tensile load of the waistline D on the vertical axis, it can be seen that the slope of the characteristic curve is gentle, that is, the stretchability is high. In addition, since the load difference between the characteristic curve at the time of expansion and the characteristic curve at the time of contraction is small, that is, the load fluctuation with respect to the fluctuation of the circumference is small, and the same wearing pressure can be obtained for both small and large infants. It can be seen that problems such as slippage of an infant with a relatively small stomach circumference and rubber marks on a child with a relatively large stomach circumference are eliminated, and the size application range of the wearer is increased.

Therefore, since the shrinkage force is high, it fits gently to the wearer and is difficult to slip off. Moreover, since the whole diaper shrinks to the maximum extent, there is an advantage that it looks compact. Moreover, since the usage-amount of the elastic member 42 can be reduced, it is advantageous also in terms of cost.
Since the heel 43 is formed on the outer surface of the composite stretchable portion 4 and the heel 43 is a contact surface with the wearer, the composite stretchable portion 4 has a high cushioning property when worn and fits gently to the wearer's skin. Less damage. Moreover, since the collar 43 is also arranged on the outer surface of the outer packaging material 2 (the outer surface when worn), the outer surface feels excellent.

  Moreover, in the composite elastic part 4 which forms the waist gather G2, and the composite elastic part 4 which forms the waistline gather G1, adjacent to the longitudinal direction of the absorptive main body 3, the multiple ridges 43 are in the elastic direction of the composite elastic part 4. The stretching direction (X direction) of the composite stretchable part 4 and the orientation direction of the constituent fibers of the outer layer sheet 21 substantially coincide with each other. Therefore, the outer appearance of the outer packaging material 2 is excellent, and in particular, the elastic members (the waist elastic member 24, the waistline elastic member 23, etc.) inside the outer layer sheet 21 are hardly visible, and the concealability of the elastic member is high.

  Hereinafter, one manufacturing method for continuously producing the pants-type disposable diaper shown in FIG. 1 will be described with reference to the drawings. FIG. 10 is a perspective view showing the entire manufacturing method. FIG. 11 is a conceptual diagram showing mainly the steps of forming the composite stretchable part, the non-functionalized region, and the leg elastic member cutting region in the present manufacturing method. FIG. 12 is a conceptual diagram showing mainly the step of forming the composite stretchable part in the present manufacturing method.

As shown in FIGS. 10 to 12, the manufacturing method includes a step of joining the outer layer sheet 21 and the inner layer sheet 22 by the joint portion 41 to form the composite stretchable portion 4, and the contraction force of the elastic members 23 and 26. The same roll 62 is used for the step of forming the non-functionalized region 51 without making it appear.
In this manufacturing method, as shown in FIG. 10, a continuous body 21S of the outer layer sheet 21 and a continuous body 22S of the inner layer sheet 22 are interposed between the continuous bodies 23S, 24S, 25S of the elastic members 23, 24, 25, 26. , 26S are sandwiched and joined to form a continuous body 2S of the outer packaging material 2, and the absorbent main body 3 is then attached to the inner layer sheet continuous body 22S side of the outer packaging material continuous body 2S by the main body joining portion 15 (see FIG. 3). It is the manufacturing method of the underpants type disposable diaper which joins and forms the diaper continuous body 1S, and then divides the diaper continuous body 1S and forms each diaper 1.

This manufacturing method will be described in detail. The outer layer sheet continuous body 21 </ b> S is used as the original sheet of the outer layer sheet 21, and the inner layer sheet continuous body 22 </ b> S is used as the original sheet of the inner layer sheet 22.
The continuous members 23S, 24S, 25S, and 26S of the elastic members 23, 24, 25, and 26 are stretched along the longitudinal direction between the outer layer continuous sheet 21S and the inner layer continuous sheet 22S. Introduced.

  In the outer layer continuous sheet 21S, the constituent fibers are oriented along the longitudinal direction. Similarly, the constituent fibers of the inner layer sheet continuous body 22S are oriented along the longitudinal direction. This manufacturing method manufactures the diaper 1 by what is called a transverse flow system. Therefore, in the outer packaging material 2 in the diaper (product) 1 manufactured by this manufacturing method, the expansion / contraction direction (width direction) of the composite expansion / contraction part 4 and the orientation direction of the constituent fibers of the outer layer sheet 21 and the inner layer sheet 22 are substantially different. Will match.

  In addition, in FIG. 11, illustration of the continuous body 26S of the front crotch elastic member 26 is abbreviate | omitted. Before the outer layer sheet continuum 21S and the inner layer sheet continuum 22S merge, the hot melt adhesive is bonded to a predetermined coating position by an adhesive coating device 64 (see FIG. 11) or the like on each facing surface side. The agent is applied. Further, the continuum 25S of the leg elastic member 25 is swung along the shape of the leg opening 13 by the swing guide 65 (see FIG. 11), while the outer layer sheet continuum 21S and the inner layer sheet continuum 22S. Introduced between.

Both sheet continuums 21S and 22S are compressed between the pair of nip rolls 61 and 61 with the elastic member continuums 23S, 24S, 25S, and 26S sandwiched therebetween. As a result, an outer packaging material continuum 2S is obtained in which the elastic member continuums 23S, 24S, 25S, and 26S are sandwiched and joined between the sheet continuums 21S and 22S. Here, the waistline elastic member 23 is not joined by the hot-melt adhesive in the region between the side edge portion of the absorbent main body 3 and the side seal portion 11. Similarly, the waist elastic member 24 is not joined by a hot melt adhesive in a region between the pair of side seal portions 11.
At this time, the composite stretchable part 4, the non-functionalized region 51, and the leg elastic member cutting region 52 are not formed in the outer packaging material continuous body 2S.

Next, the outer wrapping material continuous body 2 </ b> S in which the composite stretchable part 4 or the like is not formed is introduced between the composite stretchable part forming roll 62 and the anvil roll 63. The composite stretchable part forming roll 62 includes a composite stretchable part forming part 62A that forms the composite stretchable part 4 on its peripheral surface, and a non-functionalized region forming part 62A that forms the nonfunctionalized region 51 and leg elastic member cutting. A leg elastic member cutting region forming part 62 </ b> C that forms the region 52 is provided.
The anvil roll 63 is a receiving roll for the composite stretchable part forming roll 62, and its peripheral surface is a smooth surface.

  A plurality of embossed pins 62D (see FIG. 12) are provided in the composite stretchable part forming part 62A of the composite stretchable part forming roll 62 in correspondence with the joint part 41 of the composite stretchable part 4, and the composite stretchable part forming part 62A. According to this, the joining part 41 can be formed in the area | region corresponding to the composite expansion-contraction part 4 in the outer packaging material continuous body 2S in which the composite expansion-contraction part 4 is not formed. The emboss spin 62D may be a heat emboss spin or an ultrasonic emboss spin. FIG. 12 is a conceptual diagram showing only elements closely related to the process of forming the composite stretchable part 4. Therefore, for example, only the composite stretchable part forming part 62A is illustrated on the peripheral surface of the composite stretchable part forming roll 62, and only the composite stretchable part 4 is illustrated for the outer packaging material continuous body 2S.

  And as shown in FIG. 13, the elastic member 42 (it corresponds to the waist elastic member 23 and the waist elastic member 24 in this manufacturing method) is shrunk, and the plurality of ridges 43 are formed on each of the sheet continuous bodies 21S and 22S. By forming, the composite expansion-contraction part 4 which forms the waistline gather G1 and the waist gather G2 is obtained in the predetermined area | region of the outer packaging material continuous body 2S. FIG. 13 is a cross-sectional view showing the composite stretchable portion 4 in a region other than the region H where the folded portion 2A exists.

  The non-functionalized region forming part 62A of the composite stretchable part forming roll 62 is a part that prevents the elastic member from contracting, and can form the nonfunctionalized region 51 in the outer packaging material continuous body 2S. The non-functionalized region forming part 62A is composed of a large number of convex portions and cutter blades that divide the elastic member, a large number of emboss pins that harden the elastic member by heat sealing, and the like.

  The leg elastic member cutting region forming part 62C of the composite stretchable part forming roll 62 is a part for cutting the leg elastic member continuous body 25S existing at the position of the crotch part C in the center in the width direction. Can be formed. The leg elastic member cutting region forming part 62C is composed of, for example, a large number of convex parts and cutter blades. According to the leg elastic member cutting region forming portion 62C, the leg elastic members 25, 25 separated in the width direction at the center in the width direction of the crotch C can be obtained by cutting the leg elastic member continuous body 25S.

  Between the composite stretchable part forming roll 62 having the above configuration and the anvil roll 63, the outer envelope material continuous body 2S in which the composite stretchable part 4, the non-functionalized area 51, and the leg elastic member cutting area 52 are not formed is inserted. By doing so, the outer packaging material continuous body 2S in which the composite stretchable part 4, the non-functionalized region 51, and the leg elastic member cutting region 52 are formed in a predetermined region is obtained.

The pants-type disposable diaper 1 of the above embodiment uses the outer packaging material continuum 2S in which the composite stretchable part 4, the non-functionalized region 51, and the leg elastic member cutting region 52 are formed. It can manufacture by performing similarly to each process in the manufacturing method of what is called a cross-flow type underpants type disposable diaper.
For example, as shown in FIG. 10, the absorbent main body 3 obtained by cutting the absorbent main body continuous body 3 </ b> S on the outer packaging material continuous body 2 </ b> S is rotated 90 degrees with respect to the flow direction. The parts 15 (see FIG. 3) are joined and fixed intermittently. The absorbent main body 3 is fixed to the outer packaging material continuum 2S while maintaining the extended state of the outer packaging material continuum 2S. In other words, the absorbent main body 3 is fixed while maintaining the outer wrapping material continuous body 2 </ b> S so as not to shrink due to the shrinkage force of the composite stretchable part 4 or the like.

  Next, as shown in FIG. 12, both sides of the outer packaging material continuum 2S are folded back so as to cover both ends of the absorbent main body 3, and both sides of the outer packaging material continuum 2S are formed at both ends of the absorbent main body 3. Then, the outer packaging material continuum 2S is folded in two with the absorbent main body 3. An adhesive is preliminarily applied to a predetermined position of the inner sheet side continuous body 22S, the absorbent main body 3 and the like facing the inner surface side and / or the inner surface side of the region where the folded portion 2A exists in the outer packaging material continuous body 2S. Keep it.

Moreover, as shown in FIG.10 and FIG.11, the trim 13S for leg opening part formation is removed from the outer packaging material continuous body 2S with a rotary cutter, a laser cutter, etc., and the diaper continuous body 1S is obtained.
Then, the diaper continuous body 1S is folded back in the width direction (longitudinal direction of the disposable diaper 1) and folded in two. Next, after forming the side seal portions 11 and 11 by heat sealing, ultrasonic sealing, high frequency sealing or the like, or simultaneously with the formation of the side seal portions 11 and 11, the side seal portions 11 and 11 are divided into individual diapers. A pants-type disposable diaper 1 can be obtained.

  The pants-type disposable diaper 1 of the embodiment obtained in this way has the expansion / contraction direction (width direction) of the composite stretchable part 4 and the orientation direction of the constituent fibers of the outer layer sheet 21 and the inner layer sheet 22 in the outer packaging material 2. It is substantially consistent.

  As a method of intermittently fixing the absorbent main body 3 by 90 degrees and intermittently fixing it on the outer packaging material continuum 2S, for example, a method described in JP-A-4-166150 can be used. Moreover, the main body joint portion 15 (see FIG. 3) for fixing the absorbent main body 3 to the outer packaging material continuous body 2S may be applied to one or both of the absorbent main body 3 and the outer packaging material continuous body 2S. it can. The trim 13S for forming the leg opening can be removed before the absorbent main body 3 is fixed to the outer packaging material continuous body 2S.

  According to this manufacturing method, the outer layer sheet 21 and the inner layer sheet 22 are joined by the joining part 41 to form the composite stretchable part 4, and the contraction force of the elastic members 23 and 26 is not expressed and the non-functionalized region Since the process of forming 51 is performed using the same roll 62, the underpants type disposable diaper provided with the composite expansion-contraction part 4 and the non-functionalization area | region 51 can be produced efficiently.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment.
For example, the adhesive application portions 70 and 71 are not limited to a linear shape in plan view as in the above-described embodiment, but may be wavy. Further, the number of the adhesive application portions 70 and 71 is not limited to the above embodiment, and can be set as appropriate.
Moreover, in the said embodiment, although the underpants type disposable diaper previously shape | molded by the underpants type was mentioned as one of the application examples of the disposable diaper of this invention, what is called a deployment type disposable provided with the fastening tape of fixation. It can also be applied to diapers.

  In the embodiment, the composite stretchable part 4 is formed on the outer packaging material 2, but the composite stretchable part 4 may not be provided. Moreover, the outer packaging material 2 does not need to be composed of a plurality of separate sheets (in the embodiment, the outer layer sheet 21 and the inner layer sheet 22) as in the embodiment, and is composed of a single sheet. May be. In this case, it is also possible to fold one sheet to form two opposing surfaces, the part constituting one surface being the outer layer sheet 21 and the part constituting the other surface being the inner layer sheet 22.

Moreover, the composite expansion-contraction part 4 is applicable also to the gathers (for example, leg gather G3, front crotch gather G4) of the crotch part C. When the gathers of the crotch part C are formed from the composite stretchable part 4, the heel 43 of the composite stretchable part 4 in the gathers of the crotch part C extends along the longitudinal direction of the outer packaging material 2, and the composite stretchable part 4 in the waistline gather G1. It is preferable that it is continuous with the heel 43 of the above, and it is more preferable that it extends to the leg opening 13.
Moreover, although the number of the elastic members 42 in the composite elastic | stretch part 4 can be determined suitably according to the dimension and application of the composite elastic part 4, it can be 5-30, for example. Further, the joining portion 41 can be formed by joining with an adhesive such as ultrasonic joining or hot-melt adhesive other than heat fusion. However, bonding with an adhesive is not desirable from the viewpoint of flexibility and texture.
In addition, the arrangement pattern of the joint portions 41 can be changed as appropriate, and can be, for example, staggered. Moreover, the shape of the junction part 41 can be made into appropriate shapes, such as a rectangular shape, an ellipse shape, a circular shape, and a rhombus shape.

FIG. 1 is a perspective view showing an embodiment of the disposable diaper of the present invention. FIG. 2 is a plan view showing a state in which the disposable diaper shown in FIG. 1 is developed and extended. FIG. 3 is an exploded perspective view of the disposable diaper shown in FIG. FIG. 4 is a cross-sectional view schematically showing a cross section taken along line II shown in FIG. FIG. 5 is a developed plan view showing the skin contact surface side of the outer packaging material of the disposable diaper shown in FIG. 1. 6 is a longitudinal sectional view schematically showing a section taken along line II-II shown in FIG. FIG. 7 is a perspective view showing a composite stretchable part of the disposable diaper shown in FIG. FIG. 8 is a plan view showing the composite stretchable part shown in FIG. 7 in an expanded state. FIG. 9 is a view corresponding to FIG. 6 showing a conventional disposable diaper. FIG. 10 is a perspective view showing the entire contents of one manufacturing method of the pants-type disposable diaper shown in FIG. FIG. 11 is a conceptual diagram centering on the steps of forming the composite stretchable part, the non-functionalized region, and the leg elastic member cutting region in the manufacturing method of the pants-type disposable diaper shown in FIG. 10. FIG. 12 is a conceptual diagram centering on the step of forming the composite stretchable part of the method for manufacturing the pants-type disposable diaper shown in FIG. 10. FIGS. 13A and 13B are partially enlarged views of a longitudinal section of the composite stretchable portion, where FIG. 13A is a diagram showing an expanded state, and FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 11 Side seal part 12 Waist opening part 12a Waist opening peripheral edge 13 Leg opening part 2 Outer packaging material 2A Outer packaging material folding | turning part 2Aa Outer packaging material folding part 2B Outer packaging material bending part 21 Outer layer sheet 21A Folding part 21Aa of outer layer sheet Folding part 22 of inner layer sheet Inner layer sheet 22A Folding part 23 of inner layer sheet waist elastic member 24 waist elastic member 25 leg elastic member 26 front crotch elastic member 3 absorbent main body 3a longitudinal length of absorbent main body One end or the other end 3b Longitudinal side edge 30 of the absorbent main body 30 Curved line 32 Top sheet 33 Back sheet 34 Absorbent core 4 Composite stretchable part 41 Joint part 42 Elastic member 43 襞 51 Non-functionalized area 52 Leg elastic member cutting area 70, 71 Adhesive application part G1 Girth gather G2 Waist gather G3 Leg gather G4 Front crotch gather A Abdominal side B Back side C Crotch part D Girth part E Front crotch part F Waist part H Folding area

Claims (7)

A vertically long absorbent main body including an absorbent core and an outer packaging material joined to the non-skin contact surface side of the absorbent main body, and the outer packaging material is outward from both longitudinal ends of the absorbent main body. A disposable diaper having a length to extend,
The outer wrapping material is configured such that each of the portions extending outward from both longitudinal ends of the absorbent main body is located outside the longitudinal edge of the absorbent main body and extends in the width direction of the main body. The skin contact surface side at both ends in the longitudinal direction of the absorbent main body is covered by the folded portion of the outer packaging material.
A plurality of linear adhesive applicators extending in the width direction of the main body are intermittently arranged in the longitudinal direction of the main body between the outer packaging materials facing each other in the region where the folded portion exists, and the adhesive applicator passes through the adhesive applicator. The opposing outer packaging materials and between the folded portion and the absorbent main body, respectively ,
The plurality of linear adhesive application portions disposed between the outer packaging materials facing each other in the region where the folded portion exists, with one end or the other end in the longitudinal direction of the absorbent main body existing in the region as a boundary, A first adhesive application part located outward in the longitudinal direction of the main body and a second adhesive application part located inward, the first adhesive application part comprising: The outer packaging materials facing each other in the existing region are joined, and the second adhesive application portion joins the folded portion and the skin contact surface side at both longitudinal ends of the absorbent main body. and are disposable diapers. The outer packaging material is configured to include an outer layer sheet, an inner layer sheet, and a plurality of elastic members disposed between the two sheets, and each of the plurality of elastic members has its expansion / contraction direction aligned with the body width direction. Are arranged intermittently in the longitudinal direction of the main body,
At least in the vicinity of the region where the folded portion is present, an adhesive is substantially applied between the adjacent elastic members between the outer layer sheet and the inner layer sheet except for both ends in the width direction of the outer packaging material. The disposable diaper of Claim 1 which is not.   The outer packaging material is provided with a gather formed from a composite stretchable portion, and the composite stretchable portion is formed by intermittently joining the outer layer sheet and the inner layer sheet in the stretch direction of the composite stretchable portion and in a direction perpendicular thereto. And the elastic member is arranged so as not to pass through the joint portion, and is not fixed to the outer layer sheet and the inner layer sheet except for both ends of the elastic member, and the outer layer sheet and The disposable diaper according to claim 2, wherein each of the inner layer sheets is formed by forming a plurality of ridges extending continuously over a plurality of the elastic members. Each of the outer layer sheet and the inner layer sheet has a length extending outwardly in the longitudinal direction of the main body from each of the longitudinal ends of the absorbent main body, and the outer layer sheet is more than the inner layer sheet. The disposable diaper according to claim 2 or 3, wherein the extending length is long. The folded portion is composed of a folded portion of the outer layer sheet and a folded portion of the inner layer sheet, and the skin contact surface side at both longitudinal ends of the absorbent main body is covered only by the folded portion of the outer layer sheet. The disposable diaper according to claim 4, wherein the folded portion of the inner layer sheet is located on the outer side in the longitudinal direction of the absorbent body relative to one or the other end in the longitudinal direction of the absorbent main body. The disposable diaper as described in any one of Claims 1-5 by which the bending part of the said outer packaging material containing the said bending curve is comprised including the laminated body of four or more layers of nonwoven fabrics. The disposable diaper as described in any one of Claims 1-6 to which the adhesive agent is not substantially apply | coated to the bending part of the said outer packaging material containing the said bending curve.

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