JP5415165B2 - Manufacturing method of pant-type absorbent article - Google Patents

Description

  The present invention relates to a method for manufacturing a pant-type absorbent article.

The applicant previously described a girth gather formed from a composite stretchable part having a specific structure on a girth part of the outer body as an absorbent article such as a disposable diaper having an absorbent main body and an outer body (outer packaging material). What was provided was proposed (refer patent document 1, 2). The composite stretchable part in these absorbent articles is such that the outer layer sheet and the inner layer sheet are joined to each other by intermittent joints in the stretch direction of the composite stretchable part and the direction perpendicular thereto, so that the elastic member does not pass through the joint part. A plurality of ridges that are arranged and are not fixed to the outer layer sheet and the inner layer sheet except for both ends of the elastic member, and each of the outer layer sheet and the inner layer sheet extends continuously over a plurality of elastic members. Is formed.
Patent Document 3 discloses an exterior body in which embossed joint portions between two sheets constituting the exterior body are joined in a dotted shape, and an elastic member is disposed so as to pass between the embossed joint portions. An elastic member in which an end of the elastic member is fixed to an arcuate edge forming a peripheral edge of a leg opening in the exterior body separately from the embossed joint. It is described that an end fixing point is provided.

  In addition, as a conventional pant-type absorbent article, the exterior body is divided into an abdominal exterior body disposed on the wearer's belly side and a back side exterior body disposed on the wearer's back side, The absorbent main body is fixed so as to span the abdominal exterior body and the back exterior body, and the left and right side edges of the abdominal exterior body are joined to the left and right side edges of the back side exterior body. There are known pant-type absorbent articles. For example, Patent Literature 4 includes, as such a pant-type absorbent article, an annular elastic belt composed of a front belt portion and a rear belt portion, an absorbent main body, and a longitudinal length of the rear belt portion (backside exterior body). A pull-on garment is described in which the length in the direction is longer than the length in the longitudinal direction of the front belt portion (ventral side exterior body).

JP 2008-1332023 A JP 2008-131968 A JP 2008-161514 A Special table 2008-508082

The absorbent articles described in Patent Documents 1 and 2 have a waistline gather made of the above-mentioned composite stretchable part of the specific structure in the waistline part, and particularly when an air-permeable sheet is used as the inner layer sheet, an outer layer sheet is formed. By forming a hollow part surrounded by the wrinkles to be formed and the wrinkles formed by the inner layer sheet in the exterior body, excellent anti-damper properties were also obtained, but the absorptivity further improved the anti-drip properties It is desired to produce an article stably with good appearance. The pant-type article of Patent Document 3 requires high-precision control for providing the elastic member end fixing point at an appropriate position.
In addition, the pants-type absorbent article in which the exterior body is divided into an abdominal exterior body disposed on the wearer's ventral side and a back side exterior body disposed on the wearer's back side is a belt-like original of the exterior body Although it is possible to eliminate the removal of the trim from the opposite side, or to reduce the size of the trim to be removed, the conventional one, for example, the pull-on garment described in Patent Document 4, has room for improvement from the viewpoint of preventing stuffiness. was there.

  Therefore, the present invention relates to a method for producing a pant-type absorbent article that can efficiently produce a pant-type absorbent article that has a good appearance and is excellent in stuffiness prevention and wearing feeling.

  The present invention is fixed so as to span an abdominal exterior body disposed on the wearer's ventral side, a back exterior body disposed on the wearer's back side, and the abdominal exterior body and the back exterior body. A pant-type absorbent article comprising a pair of side seals formed by joining both side edges of the ventral exterior body and both side edges of the back exterior body. And a superposition process in which two belt-like sheets are overlapped with each other through a plurality of elastic members, and three or more joints in which joint portions are arranged in series in the flow direction on the two belt-like sheets overlapped. A joining step for obtaining a composite sheet in which a joining portion is formed and both belt-like sheets are partially joined so that joining rows are formed on both sides of each of the plurality of elastic members, , Each of a plurality of junctions constituting one junction row intersects the flow direction Splitting process so that it is divided into two in the direction, and two narrow strips are obtained while continuously transporting the two narrow strips with a gap between them. Absorbent main body fixing step for obtaining an absorbent article continuum by fixing the absorbent main body so as to hang over the sheet, a two-fold step for folding the absorbent article continuum in half in the width direction, and the bifurcated absorbency Provided is a method for producing a pant-type absorbent article, comprising a cutting step of forming a side seal portion on the article continuum and cutting the absorbent article continuum to obtain individual pant-type absorbent articles. .

  According to the method for producing a pant-type absorbent article of the present invention, it is possible to efficiently produce a pant-type absorbent article having a good appearance and excellent anti-dampness and wearing feeling.

Drawing 1 is a figure showing the use state (wearing state) of the underpants type disposable diaper obtained by one embodiment of the present invention, (a) is the figure seen from the ventral side, (b) is the side The figure seen from the direction, (c) is the figure seen from the back side part side. FIG. 2 is a partially broken plan view showing a developed and extended state of the pants-type disposable diaper shown in FIG. The expanded and extended state means that the side seal part is peeled off to make the pant-type absorbent article in an expanded state, and the expanded absorbent member is stretched to the elastic member of each part, and the design dimensions (influence of the elastic member) Is the same as the dimension when the sheet is expanded in a flat state with all of the above removed. FIG. 3 is a partially broken enlarged view showing an abdominal or dorsal exterior body in the pants-type disposable diaper shown in FIG. 1. FIG. 4 is a view showing a cross section along the absorbent article lateral direction of the extending part stretchable part in the pants-type disposable diaper shown in FIG. 1, and (a) is a state in which the elastic member 24 is extended to eliminate wrinkles. (B) is a figure which shows the state in which the elastic member 24 shrink | contracted and the collar 29 is formed. FIG. 5 is a schematic process diagram showing how the pants-type disposable diaper shown in FIG. 1 is manufactured according to an embodiment of the present invention. FIG. 6 is a perspective view showing details of the dividing step in one embodiment of the present invention. FIG. 7 is a perspective view showing a lower end portion of the ventral-side exterior body or the back-side exterior body.

Hereinafter, the manufacturing method of the underpants type absorbent article of this invention is demonstrated, referring drawings based on the preferable one embodiment.
As shown in FIGS. 1 and 2, the pant-type absorbent article manufactured in this embodiment includes an abdominal exterior body 2 </ b> A disposed on the wearer's ventral side and a dorsal side disposed on the wearer's back side. An exterior body 2B, and an absorbent main body 3 fixed so as to be bridged between the abdominal exterior body and the back exterior body, and the side edges 2a and 2a of the abdominal exterior body 2A and the back exterior body 2B. A pants-type disposable diaper 1 in which a pair of side seal portions 4 and 4 is formed by joining both side edge portions 2b and 2b.

  Further, in the manufacturing method of this embodiment, as shown in FIG. 5, the two belt-like sheets 122 and 123 are overlapped with a plurality of elastic members 24 interposed, and as shown in FIG. Three or more joining row | line | columns (L1-L7) in which the joining part 26 was located in a line in the flow direction (MD) were formed in the two strip | belt-shaped sheet | seats 122 and 123 put together, and the some elastic member 24 each. FIG. 6 shows a joining process for forming a composite sheet 100 in which the belt-like sheets 122 and 123 are partially joined by forming the joint part 26 so that the joint row is located on both sides of the composite sheet 100. Are divided so that each of the plurality of joints 26c, 26c,... Constituting one joint row L4 is divided into two in the crossing direction (CD), and the two narrow strip sheets 102A, 102B are divided. Dividing process to obtain, shown in FIG. As described above, the two narrow belt-like sheets 102A and 102B are fixed so as to bridge the absorbent main body 3 between the two narrow belt-like sheets 102A and 102B while being continuously conveyed with a gap therebetween. Absorbent body fixing step for obtaining the absorbent article continuum 101, a two-fold process for folding the absorbent article continuum 101 in two, and the side seal portions 4 and 4 are formed on the folded absorbent article continuum 101, The absorbent article continuum 101 is cut to obtain individual pants-type disposable diapers 1.

Hereinafter, the manufacturing method of this embodiment will be described in more detail.
First, the underpants type disposable diaper 1 manufactured by this embodiment is demonstrated.
The abdominal exterior body 2A and the back exterior body 2B in the pants-type disposable diaper 1 manufactured in the present embodiment (hereinafter, also referred to as diaper 1) each have a horizontally long rectangular shape, as shown in FIG. A pair of side edges 2a, 2a along the absorbent article longitudinal direction (X direction) of the ventral exterior body 2A and side edges 2b, 2b along the absorbent article longitudinal direction of the back exterior body 2B are joined together. Side seal portions 4 and 4 are formed. Further, in the abdominal side exterior body 2A and the back side exterior body 2B, the lengths La and Lb in the longitudinal direction of the absorbent article are longer than the length of the side seal portion L4 and extend downward from the side seal portion 4 respectively. It has the extended parts 21a and 21b to protrude. Moreover, the part located in the outward direction from each side edge of the absorptive main body 3 in the said extended part 21a of 2 A of ventral | abdominal exterior bodies has a stretching property in the horizontal direction (Y direction) of an absorbent article. . Here, having the elasticity in the transverse direction of the absorbent article is not limited to having elasticity in the lateral direction (Y direction) only, but in the lateral direction (Y direction) and the longitudinal direction (X direction). You may have. Moreover, it may expand and contract in all directions within the plane.

  As shown in FIG. 1 and FIG. 2, the diaper 1 is, when worn, an abdominal side A disposed on the abdomen side of the wearer, a dorsal side B disposed on the back side of the wearer, and an abdomen side part. It has a crotch part C which is located between A and the back side part B and is arranged in a wearer's crotch part. The longitudinal direction of the diaper (absorbent article) 1 is the direction from the abdominal side A through the crotch C to the back side B or the opposite direction (FIG. 2) when the diaper 1 is expanded and stretched (see FIG. 2). Medium X direction), and the horizontal direction of the diaper (absorbent article) 1 is a direction orthogonal to the vertical direction (Y direction in FIG. 2).

As shown in FIG. 2, the absorbent main body 3 of the diaper 1 has a liquid-permeable top sheet 31, a liquid-impermeable or water-repellent back sheet 32, and a liquid holding member disposed between both sheets 31 and 32. It has an absorbent core 33 and is formed in a rectangular shape that is long in the X direction.
Side cuffs 34 and 34 made of a liquid-resistant or water-repellent and breathable material are formed on both sides in the longitudinal direction of the absorbent main body 3. In the vicinity of the free end of each side cuff 34, a side cuff elastic member 35 is arranged in an extended state. When the diaper 1 is worn, the side cuff 34 is erected by contracting the side cuff elastic member 35, and the outflow of liquid from the absorbent main body 3 to the outside in the width direction is prevented. As the top sheet 31, the back sheet 32, and the absorbent core 33, the same ones conventionally used for this type of absorbent article can be used. An exterior sheet such as a nonwoven fabric or a film is disposed on the outside of the absorbent main body 3. The exterior sheet may be integrated with the back sheet 32.

The ventral exterior body 2A has a horizontally long rectangular shape when the diaper 1 is expanded and extended (see FIG. 2), and a pair of left and right side edge portions 2a, 2a along the diaper longitudinal direction (X direction); It has a pair of upper and lower end edges 2c and 2d along the diaper lateral direction (Y direction). Similarly, the back exterior body 2B has a horizontally long rectangular shape, a pair of left and right side edges 2b, 2b along the diaper longitudinal direction (X direction), and a pair of upper and lower sides along the diaper lateral direction (Y direction). End edges 2c and 2d. 2A and 2B, the length of the diaper longitudinal direction (X direction) is uniform in the diaper lateral direction (Y direction).
Then, a part 2a ′ of the side edge 2a of the ventral side exterior body 2A and a part 2b ′ of the side edge 2b of the back side exterior body 2B are joined, so that the diaper 1 has a side seal. Portions 4 and 4, a waist opening 5 and a pair of leg openings 6 and 6 are formed. For this joining, for example, a heat seal, a high frequency seal, an ultrasonic seal, an adhesive, or the like is used. FIG. 1 shows a state where the infant's trunk 7 a is inserted into the waist opening 5 and the infant's legs 7 b and 7 b are inserted into the leg openings 6 and 6.

  As for the absorptive main body 3, the one end side (part which overlaps with the ventral | abdominal exterior body 2A) of the longitudinal direction is fixed to the center part of the Y direction of the abdominal exterior body 2A via an adhesive agent, and the other end of a longitudinal direction The side (portion overlapping with the backside exterior body 2B) is fixed to the center of the backside exterior body 2B in the Y direction via an adhesive.

As shown in FIG. 2, the belly side exterior body 2 </ b> A and the back side exterior body 2 </ b> B are in a state in which the elastic member 24 is stretched as shown in FIG. 2 for forming a gather by contraction of the elastic member 24 disposed on the sheet. It is preferably a horizontally long rectangular shape, and like a diaper according to a third embodiment to be described later, a material that exhibits stretchability by an elastic filament or the like fixed to a non-stretchable nonwoven fabric is substantially In particular, it is preferably a horizontally long rectangular shape in a non-stretched state.
In addition, after the elastic filament is fixed between the nonwoven fabrics, an elastic sheet such as an elastic sheet that is stretched by being bitten between a pair of pressing molds that mesh with each other is joined to the non-extensible sheet in an extended state. And when the ventral exterior body and back side exterior body which consist of both sheets are obtained, it is preferable that the shape in the state extended until this elastic sheet is extended with a non-extensible sheet | seat is a laterally long rectangular shape. .

  As shown in FIG. 2, the side seal portion 4 is formed shorter than either the length La of the abdominal exterior body 2A or the length Lb of the back exterior body 2B. The exterior body 2B is formed with extending portions 21a and 21b that extend downward from the side seal portion 4 (downward when worn, downward in each figure of FIG. 1). The side seal portion 4 is formed on the side edge portions 2a and 2a of the ventral side exterior body 2A and the side edge portions 2b and 2b of the back side exterior body 2B, but has a non-joined portion outside the side seal portion 4. It may be.

As shown in FIG. 3, the ventral exterior body 2 </ b> A and the back exterior body 2 </ b> B in the diaper 1 both have an outer layer sheet 22 that forms the outer surface of the diaper, and an inner layer sheet 23 disposed on the inner surface side of the outer layer sheet 22, And a plurality of thread-like elastic members 24 disposed between the sheets 22 and 23, each having a waist stretchable part G1, a waistline stretchable part G2, and an extended part stretchable part G3.
The waist stretchable part G1 is formed outward from the longitudinal ends 3a, 3b of the absorbent main body 3 in the longitudinal direction (X direction) of the diaper 1, and the extended stretchable part G3 is It is formed in the extension part 21a of the exterior body 2A and the extension part 21b of the back side exterior body 2B, and the waist extension part G2 is a waist in the X direction in each of the abdominal side exterior body 2A and the back side exterior body 2B. It is formed between the stretchable part G1 and the extended part stretchable part G3. The waistline stretchable part G2 and the extended partial stretchable part G3 are formed on the outer sides of both side edges in the longitudinal direction of the absorbent main body 3 in the lateral direction (Y direction) of the diaper 1. That is, the waistline stretchable part G2 and the extended part stretchable part G3 are at least in the portions located outward from both side edges in the longitudinal direction of the absorbent main body 3 in each of the abdominal exterior body 2A and the back exterior body 2B. Expresses elasticity. In addition, in FIG. 3, the position where the absorptive main body 3 is arrange | positioned is shown with the dashed-two dotted line.

In the waist stretchable part G1, the waistline stretchable part G2, and the extended partial stretchable part G3, the outer layer sheet 22 and the inner layer sheet 23 are joined at a large number of joints 26 formed in a dotted pattern. More specifically, a plurality of rows of joint portions in which the joint portions 26 are intermittently arranged in series in the lateral direction (Y direction) of the diaper 1 are formed in the longitudinal direction (X direction) of the diaper 1. Further, the positions in the Y direction of the respective joints in the joint rows are also consistent in all the joint rows.
Moreover, in the diaper 1, the vertical junction row | line | column by which the junction part 26 is arranged in series in the vertical direction (X direction) of the diaper 1 is also formed, and this vertical junction row | line | column is the horizontal direction (Y of a diaper 1). A plurality of rows are formed at intervals in the direction).

  And in any of the expansion-contraction parts G1-G3, the some elastic member 24 is distribute | arranged so that each may pass between the junction parts 26 adjacent to the vertical direction. In addition, each elastic member 24 is fixed between the sheets 22 and 23 at an end fixing portion 27 or an absorbent main body fixing portion 28 described later. Also not fixed.

The waist stretchable part G1 of the ventral exterior body 2A is a pair of end fixings in which the outer layer sheet 22 and the inner layer sheet 23 are joined to both side edges 2a, 2a of the ventral exterior body 2A via an adhesive. It has a portion 27 (see FIG. 3). The elastic member 24 disposed in the waist stretchable part G1 is fixed between the sheets 22 and 23 in each of the pair of end fixing parts 27, and between the end fixing parts 27, the elastic member 24 is located on any of the sheets 22 and 23. Also not fixed. The same applies to the waist stretchable part G1 of the backside exterior body 2B.
The waistline stretchable part G2 and the extended part stretchable part G3 of the ventral-side exterior body 2A are both attached to one side edge of the ventral-side exterior body 2A via the adhesive between the outer layer sheet 22 and the inner layer sheet 23. The outer layer sheet 22 and the inner layer sheet 23 are bonded via an adhesive in the vicinity of the position of the side edge 3c of the absorbent main body 3. An absorbent main body side fixing portion 28 is provided. The elastic member 24 disposed on the waist elastic part G2 and the extended part elastic part G3 is fixed between the sheets 22 and 23 in the end fixing part 27 and the absorbent main body side fixing part 28, respectively. Between the fixing part 27 and the absorbent main body side fixing part 28, it is not fixed to any of the sheets 22 and 23. The same applies to the waistline stretchable part G2 and the extended part stretchable part G3 in the backside exterior body 2B.

As shown in FIG. 3, the absorbent main body side fixing portion 28 may be formed so as to extend inside and outside the side edge 3 c of the absorbent main body 3, but is formed so as to overlap the absorbent main body 3 as a whole. May be. The aspect in which the entirety overlaps with the absorbent main body 3 is an aspect in which the position of the end of the absorbent main body side fixing portion 28 on the lateral side of the diaper coincides with the position of the side edge 3c of the absorbent main body 3. Both of the aspect in which the absorbent main body side fixing portion 28 is formed with a predetermined interval between the side edge 3c of the absorbent main body 3 are included.
Moreover, the absorptive main body side fixing | fixed part 28 can also be formed in the outer side of a diaper horizontal direction rather than the side edge 3c of the absorptive main body 3. FIG.

  In each of the waist stretchable part G1, the waistline stretchable part G2 and the extended partial stretchable part G3, the elastic member 24 contracts, so that the sheets 22 and 23 between adjacent longitudinal joint line are expanded outward. As a result, a flange 29 composed of the sheet 22 or the sheet 23 is generated between the adjacent longitudinal joining portion rows, and a hollow portion 30 surrounded by the flange 29 and the flange 29 is formed between the sheets 22 and 23. (See FIG. 4). By forming the heel 29 and the hollow portion 30, the softness of the abdominal exterior body 2 </ b> A and the back exterior body 2 </ b> B is improved to improve the touch and the like, and between the heel 29 formed on the skin contact surface side Air is easy to circulate and has excellent anti-sag properties. In particular, when the inner layer sheet 23 is formed of a breathable sheet such as a nonwoven fabric, moisture in the diaper 1 is more easily released to the outside.

In the diaper 1 of the present embodiment, since the above-described extending portions 21a and 21b are formed on the abdominal exterior body 2A and the back exterior body 2B, when the diaper 1 is worn, the abdominal exterior body 2A and As shown in FIG. 1 (b), the side edges 2a, 2b existing in the extended portions 21a, 21b of the backside exterior body 2B are divided into the ventral side direction and the backside direction and open in an inverted Y shape. A concave edge portion is formed downward along the leg of the leg portion 7b. In addition, the extension part stretchable part G3 is located in the extension parts 21a and 21b of the ventral side exterior body 2A and / or the back side exterior body 2B, and the stretchability in the diaper lateral direction is given to the extension parts 21a and 21b. Therefore, the edge part of the extension parts 21a and 21b hits the upper part of the leg part 7b flexibly, and prevents the diaper 1 from slipping downward.
In addition, the stretching stress of the extended stretchable part G3 functions to further strengthen the stretched stress of the waist stretchable part G1 and the waistline stretchable part G2 that tightens the body when worn, and the fit to the body is enhanced.
Therefore, according to the diaper 1, excellent slip-off prevention properties can be obtained without excessively increasing the tightening force of the waist opening 5 and the leg opening 6.

  Further, the extended portions 21a and 21b extend outward in the diaper lateral direction from both side edges of the absorbent main body 3, and the extended portions are appropriately contracted, so that the edge portions 21a and 21b are illustrated in FIG. As shown in FIG. 1 (b), the peripheral edge of the leg opening with a sense of unity is formed together with the absorbent main body 3, so that it looks good and does not give anxiety to the mole.

  Moreover, in the diaper 1, since the extension parts 21a and 21b are formed in the abdominal exterior body 2A and the back exterior body 2B, the side seal part 4 is relatively straight as shown in FIG. Since it is easy to maintain the state, it is possible to apply a uniform and even tightening force to the abdominal side A and the back side B.

  Moreover, in the diaper 1, not only the extension part 21a of the ventral-side exterior body 2A but also the extension part 21b of the back-side exterior body 2B is imparted with stretchability in the diaper lateral direction. Therefore, the slip-off preventing property is further improved.

  The degree of stretchability in the diaper lateral direction of each of the extended portions 21a and 21b is determined from the lateral edge 3c of the absorbent main body 3 of each of the extended portions 21a and 21b in the unfolded and extended diaper 1 in the lateral direction. When the length extending in the direction is 100%, the same length in the contracted state is preferably 90 to 15%, more preferably 60 to 20%, and more preferably 50 to 25%. Is more preferable.

From the viewpoint of ensuring that one or more of the above-described effects are more reliably exhibited, the abdominal exterior body 2A and the back exterior body 2B are each provided with an extension length L5 of the extension portions 21a and 21b. L6 is preferably 5 to 150% of the length L4 of the side seal portion 4 and more preferably 25 to 70%.
From the same viewpoint, the extending length L5 of the extending portion 21a of the ventral side exterior body 2A is preferably 5 to 60%, particularly 20 to 40% of the length La of the ventral side exterior body 2A. The extension length L6 of the extension portion 21b of the backside exterior body 2B is preferably 5 to 60%, particularly 20 to 40%, of the length Lb of the backside exterior body 2B.
In addition, it is preferable that extension length L5, L6 of each extension part 21a, 21b is 10 mm or more, and it is more preferable that it is 20 mm or more.
In the case of diapers for infants, the extension lengths L5 and L6 of the extension portions 21a and 21b are more preferably 10 to 100 mm, and still more preferably 20 to 70 mm. In the case of an adult diaper, the extension lengths L5 and L6 of the extension portions 21a and 21b are more preferably 10 to 150 mm, and still more preferably 20 to 100.

  Further, the abdominal exterior body 2A and the back exterior body 2B are formed from the above-described extension portion 21a, from the viewpoint of reducing anxiety about leakage by reducing the exposed portion of the skin that is visible when the wearer is viewed from the front side. It is preferable that the extension lengths L5 and L6 of 21b are substantially equal. The extension lengths L5 and L6 of the extension portions 21a and 21b are substantially equal to the extension length L5 of the extension portion 21a of the ventral side exterior body 2A and the extension length 21b of the back side exterior body 2B. This refers to the case where the length L6 has a relationship of 5 mm or less.

On the other hand, extending portions 21a and 21b are formed on both the abdominal exterior body 2A and the back exterior body 2B, and the extension length L6 of the extension portion 21b of the back exterior body 2B is set to It is also preferable to make it longer than the extension length L5 of the extension portion 21a. According to the pants-type absorbent article having such a configuration, the front side of the wearer's crotch can be covered to some extent while covering the buttock to prevent excessive exposure, and thus the diaper is excellent in appearance. From such a point of view, the extension length L6 is more preferably 1.1 to 2.5 times the extension length L5.
In the pant-type absorbent article in which the extending portion 21b of the backside exterior body 2B is longer than the extending portion 21a of the abdominal exterior body 2A, only the extending portion 21b of the backside exterior body 2B is stretchable. It is also preferable from the viewpoint of improving fit and appearance on the back side of the wearer.

  The outer layer sheet 22 and the inner layer sheet 23 have extended folded portions 22a and 23a that are folded back to the inner layer sheet 23 side at the edge 2d that forms the opening peripheral edge of the waist opening. 22a and 23a are joined to the non-folded portions of the outer layer sheet 22 and the inner layer sheet 23 in the side seal portion 4, and the portion overlapping the longitudinal direction of the absorbent main body 3 is bonded to the absorbent main body by an adhesive. 3 is joined to the surface of the top sheet side.

  As the outer layer sheet 22 and the inner layer sheet 23, various sheet materials conventionally used for this type of article can be used without particular limitation, but is preferably a non-woven fabric, particularly from the viewpoint of flexibility and the like. It is preferably a single-layer nonwoven fabric or a laminated nonwoven fabric of two or more layers composed of a through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a melt blown nonwoven fabric, or the like. Moreover, the sheet | seat which integrated these nonwoven fabrics and films may be sufficient. As a forming material of the elastic member 24, 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, it is preferable to use a thread-like (thread rubber etc.) or string-like (flat rubber etc.) cross-section having a rectangular, square, round, polygonal cross section, or a multifilament type thread-like one. it can.

Next, as an embodiment of the present invention, a preferred method for manufacturing the pants-type disposable diaper 1 will be described with reference to FIGS. The manufacturing method of this embodiment is a method of manufacturing the diaper 1 continuously.
In the manufacturing method of the present embodiment, as shown in FIG. 5, a plurality of wide strip sheets 122 that are the raw sheets of the outer layer sheets and wide strip sheets 123 that are the raw sheets of the inner layer sheets are provided between them. The elastic member 24 is superposed on the stretched state (polymerization step). Before the two belt-like sheets 122 and 123 are overlapped, the adhesive for forming the end fixing portion 27 and the absorbent main body-side fixing portion 28 is attached to the belt-like sheet 122 and / or the belt-like sheet 123 with an adhesive coating machine (not shown). The agent is intermittently applied, and the elastic member 24 is fixed between the belt-like sheets 122 and 123 at both fixing portions 27 and 28 by pressurization by the nip roll 90.

Next, the overlapped belt-like sheets 122 and 123 are arranged opposite to the pressure roll 91 and the pressure roll 91 in which the convex portion for forming the joint portion 26 and the convex portion for cutting the elastic member 24 are formed on the peripheral surface. By introducing between the anvil roll 92 and partially pressurizing and heating it, the multiple joints 26 described above are formed, and the elastic member 24 at the site where the absorbent main body 3 is disposed is cut. To do.
The two belt-like sheets 122 and 123 are partially joined by the formation of the joining portion 26 (joining process). As shown in FIG. 6, the joint portion 26 is formed by arranging two or more joint rows in which the joint portions 24 are arranged in series in the flow direction (MD) on the two belt-like sheets 122 and 123 that are overlapped. To be formed. FIG. 6 shows only the seven joint rows L1 to L7 formed near the cutting line CL to be cut later. Further, as shown in FIG. 6, the joint portions 26 are formed so that the joint portion rows are located on both sides of each of the plurality of elastic members 24. For example, in the example illustrated in FIG. 6, the joint portion row L3 and the joint portion row L4 are formed on both sides of the elastic member 24a, and the joint portion row L4 and the joint portion row L5 are formed on both sides of the elastic member 24b. It is.

  Next, the two strip-like sheets 122 and 123 (composite sheet 100) joined by the joining portion 26 laminated with the elastic member 24 interposed therebetween are divided into two narrow strip-like sheets 102A and 102B by the dividing means 93. Divide (dividing process). As shown in FIG. 6, this division is performed so that each of the plurality of joints 26c, 26c... Constituting one joint row L4 is divided into two in the cross direction (CD). The joint part 26a and the joint part 26b shown in FIG. 6 are produced by dividing one joint part 26c into two parts. The joint portion 26c is divided into two equal parts, that is, the small joint part 26a and the small joint part 26b having the same length in the CD direction may be formed. It is preferable to divide the joint portion 26c into two parts so that the length in the CD direction of each of the small joint portion 26a and the joint portion 26b generated by the division is 0.5 mm or more, more preferably 2 mm or more. In addition, in the splitting of the joint portion 26c, the length in the CD direction of each of the small joint portion 26a and the joint portion 26b generated by the split is 10 to 90% of the length in the CD direction of the joint portion 26c before the division. It is preferable to carry out so that it may become 1-30 mm or more preferably. The narrow width of the narrow strip sheet means that it is narrower than the width of the composite sheet 100 before division.

  The joint portion 26c divided into two may have the same or shorter length in the CD direction as the other joint portions that are not divided, but is preferably longer than the other joint portions that are not divided. It is preferable that the length is about 1.5 to 10 times, particularly about 2 to 5 times the length of other joints that are not performed.

The two narrow belt-like sheets 102A and 102B generated by the division are used as the ventral exterior body continuum 102A and the back side exterior body continuum 102B. The abdominal exterior body continuum 102A generally has a configuration in which a plurality of abdominal exterior bodies 2A of diapers 1 are continuous, and the back exterior body continuum 102B generally has a plurality of diaper 1 backs. The side exterior body 2B has a continuous configuration.
As the dividing means 93, various known cutting devices that can continuously cut the sheet can be used. For example, a cutter provided on the upstream side in the flow direction of the sheet, or an annular surface or peripheral portion. A cylindrical or disk-shaped cutter, a laser cutter, a high-pressure water flow cutter, or the like having a blade can be used.
The dividing means 93 shown in FIG. 6 is a disk-shaped cutter having a rotation axis parallel to the MD direction, and has a sharp blade on the peripheral surface. A receiving roll with a smooth surface is disposed on the opposite side of the disc-shaped cutter with the composite sheet 100 interposed therebetween. The disk-shaped cutter and the receiving roll may be driven to rotate at a predetermined speed by a motor or the like, or may be rotated following the conveyance of the composite sheet 100.

  Next, while the abdominal exterior body continuum (narrow strip sheet) 102A and the back exterior continuum body (narrow strip sheet) 102B are continuously conveyed with a predetermined gap therebetween, the ventral side It fixes so that the absorptive main body 3 may be bridged over 102 A of exterior body continuous bodies, and the backside exterior body continuous body 102B (absorbent main body fixing process). In order to fix the absorbent main body 3, an adhesive is applied to the surface of the absorbent main body 3 on the back sheet side and / or the opposing surfaces of the two continuous bodies 102A and 102B. Further, in this embodiment, one side portions 102A ′ and 102B ′ along the flow directions of the abdominal exterior body continuum 102A and the back exterior body continuum 102B are covered with both end portions of the absorbent main body 30. The folded portion is fixed to both end portions.

  And the diaper continuous body 101 obtained by fixing the absorptive main body 3 is folded in two in the width direction (two-folding process), and then the side seal portions 4 and 4 are heat sealed, ultrasonic sealed, and high frequency. A seal, an adhesive, or the like, or a combination of these means is formed. For the formation of the side seal portions 4 and 4, a seal device (not shown) provided with a pair of seal rolls is preferably used. Further, when the diaper continuous body 101 is folded in two, the edge portions 101 ′ generated by folding the side portion 102A ′ of the ventral side exterior body continuous body 102A and the side portion 102B ′ of the back side exterior body continuous body 102B overlap. Do as follows.

  And after formation of the side seal parts 4 and 4, the diaper continuous body 101 is cut | disconnected to the dimension of each diaper 1 with a well-known cutting means (not shown) (cutting process). Thereby, the underpants type disposable diaper 1 of the structure mentioned above is obtained. The side seal portions 4 and 4 are formed so as not to cover the full widths of the abdominal exterior continuum 102A and the back exterior continuum 102B. The extending portions 21a and 21b described above are formed. The diaper continuous body 101 can be cut simultaneously with the formation of the side seal portions 4 and 4.

  Regarding the manufacturing method of the present embodiment, points that are not particularly described can be manufactured in the same manner as the conventional manufacturing method of a so-called cross-flow type pants-type disposable diaper. For example, the absorptive main body 3 arranged on the abdominal exterior body continuum 102A and the back side exterior body continuum 102B is manufactured by a publicly known method of the absorptive body continuum 103 having a configuration in which the absorptive body is continuous in the longitudinal direction. Then, it can be obtained by cutting it into the size of one diaper. Moreover, the obtained absorptive main body 3 can be intermittently disposed on the ventral exterior body continuum 102A and the back exterior body continuum 102B after being rotated by 90 degrees.

  According to the manufacturing method of this embodiment, the belt-like sheets 122 and 123 in the laminated state are cut to obtain two narrow belt-like sheets 102A and 102B, from which the ventral-side exterior body 2A and the back-side exterior are obtained. Since the body 2B is obtained, as shown in FIG. 7, at the lower ends (ends on the crotch side) of the ventral side exterior body 2A and the back side exterior body 2B, the edge of the outer layer sheet 22 and the edge of the inner layer sheet 23 As shown in FIG. 7, the lower end of the ventral exterior body 2A and the back exterior body 2B is surrounded by the ridge 29 formed by the outer layer sheet 22 and the ridge 29 formed by the inner layer sheet 23, as shown in FIG. The hollow part 30 is open and the appearance is good. Moreover, since the opening state is maintained relatively stably, air can be circulated through the hollow portions 30 or the recesses between the flanges 29, and excellent anti-dampness and wearing feeling can be obtained. The anti-smoothing property is even better when the inner layer sheet 23 and the outer layer sheet 22 are made of a breathable sheet.

  Moreover, according to the manufacturing method of this embodiment, since a pants-type disposable diaper can be manufactured without removing the trim for leg opening formation from the strip | belt sheets 122 and 123 for exterior body formation, removal of a trim In addition, a pants-type disposable diaper can be efficiently and economically manufactured without using a process necessary for reuse. In addition, because trim does not occur, it is environmentally friendly.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the embodiment mentioned above.
For example, in the above-described embodiment, the side seal portions 4 and 4 are formed so as not to cover the full widths of the abdominal exterior body continuum 102A and the back exterior body continuum 102B, and the ventral exterior of the diaper 1 is formed. The pants-type disposable diaper 1 having extended portions 21a and 21b extending downward from the side seals 4 and 4 on the body 2A and the back side exterior body 2B was manufactured. A pants type having a ventral side exterior body 2A and a back side exterior body 2B which are formed so as to extend over the entire width of each of the continuous body 102A and the back side exterior body continuous body 102B and do not have such extended portions 21a and 21b. Disposable diapers can also be manufactured.
Moreover, in the embodiment mentioned above, as shown in FIG. 6, although the position of the junction part L1-L7 formed in the strip | belt-shaped sheets 122 and 123 corresponded in the MD direction of each junction part 26, it adjoins. It is also possible to form the joints 26 in a staggered manner as a whole by shifting the position of the joints 26 by a half pitch in the joint rows L1 to L7. The shape of each joint portion 26 may be an arbitrary shape such as an ellipse, an ellipse, a circle, and a rhombus in addition to a rectangle.

  Further, as shown in FIG. 5, the ventral exterior body continuum 102 </ b> A and / or the back exterior body continuum 102 </ b> B may be folded back on one side 102 </ b> A ′ and 102 </ b> B ′ along the flow direction. And it may cut | disconnect without passing through such a folding | returning process and may become the ventral | abdominal exterior body 2A or the back | dorsal exterior body 2B.

  The pants-type absorbent article may be a pants-type sanitary napkin or the like in addition to a pants-type disposable diaper for infants or adults.

1 Pants-type disposable diapers (pants-type absorbent articles)
2A Ventral exterior body 21a Extension part 2B Back side exterior body 21b Extension part 22 Outer layer sheet 23 Inner layer sheet 3 Absorbent main body 31 Top sheet 32 Back sheet 33 Absorbent core 34 Side cuff 4 Side seal part 5 Waist opening 6 Leg opening part A Abdominal side part B Back side part C Crotch part 122,123 Belt-like sheet 102A Abdominal side exterior body continuum (narrow belt-like sheet)
102B backside exterior continuum (narrow strip sheet)
93 Dividing means

Claims (2)

An abdominal exterior body disposed on the abdomen side of the wearer, a back side exterior body disposed on the back side of the wearer, and an absorptive main body fixed so as to span the abdomen exterior body and the back exterior body A pants-type absorbent article manufacturing method in which a pair of side seal portions are formed by joining both side edges of the ventral exterior body and both side edges of the back exterior body ,
In the pant-type absorbent article, the abdominal exterior body and the back exterior body are each an expansion / contraction part formed by arranging an elastic member in an expanded state between two sheets, It has an elastic part having an end fixing part formed on the side edge part of the backside exterior body and an absorbent main body side fixing part formed in the vicinity of the position of the side edge of the absorbent main body,
The stretchable part is formed with a plurality of joint rows in which the two sheets are partly joined, and a plurality of joints are arranged in series in the lateral direction of the absorbent article. The member is fixed between the two sheets in each of the end fixing portion and the absorbent main body fixing portion, while between the end fixing portion and the absorbent main body fixing portion. , A pants-type absorbent article that is located between the joint rows and is not fixed to any of the two sheets.
A superposition process in which two belt-like sheets are overlapped with each other through a plurality of elastic members, and three or more joint rows in which joint portions are arranged in series in the flow direction on the two belt-like sheets that are overlapped. A joining step for forming a composite sheet in which both belt-like sheets are partially joined by forming joints so that joint rows are located on both sides of each of the plurality of elastic members, divided so that each of a plurality of joints that make up the joint column is bisected in a direction crossing the flow direction, it split to obtain two narrow belt-like sheet, the two narrow belt-like sheet Absorbent body fixing step for obtaining an absorbent article continuous body by fixing the absorbent main body so as to hang over the two narrow belt-like sheets while continuously conveying the gap between the two, and the absorbent article continuous body Folding process of folding the sheet in the width direction, and The side seal portion is formed in the folded and the absorbent article continuous body, and cutting the absorbent article continuous body comprising a cutting step of obtaining the individual pant-type absorbent article,
The manufacturing method of a pants-type absorbent article, wherein the plurality of joints divided in the dividing step have a length in a direction intersecting the flow direction of the composite sheet longer than other joints that are not divided . The manufacturing method of the underpants type absorbent article of Claim 1 which comprises pressurizing the two said strip | belt-shaped sheet | seats which overlap | superposed, and cut | disconnecting the elastic member distribute | arranged to the site | part which arrange | positions the said absorptive main body.

Images