JP5238061B2 - Pants-type disposable diaper manufacturing method - Google Patents

Description

  The present invention relates to a method for producing a pants-type disposable diaper, and more particularly to a continuous method for producing a trunks-type pants-type disposable diaper.

Conventionally, a pants-type disposable diaper having a leg opening and a waist opening is well known.
This pants-type disposable diaper has a V-shaped leg from the lower crotch to the waist side along the base of the leg to improve the fit around the leg and prevent leakage from the leg opening. In general, it has a brief shape with a peripheral edge formed.

JP 2006-149464 A JP 2006-230920 A US Patent Application Publication No. 2004/0098791 JP 2005-110990 A

In this brief type diaper, pockets that contribute to leakage prevention are formed on the side edges of the legs and the absorbent side of the crotch by elastic elastic members arranged on the edges of the legs. When you wear it over and over, the waistline and crotch area are unnaturally tensioned, and it tends to appear in appearance, which may be a psychological burden on the diaper wearer.
On the other hand, various types of underwear such as a trunks type and a boxer type are widespread, and some people prefer such a trunks type design to a brief type. However, in selecting a diaper, there is currently only a brief type and there is no room for design selection.
There is a disposable diaper called a trunks type, but it is actually a brief type disposable diaper fitted with a trunks-like exterior, a stationary type, or a clear trunks type pant There is no type disposable diaper.
On the other hand, one of the reasons why there is no trunks-type disposable diaper is that a continuous manufacturing method such as a brief-type pant-type diaper has not been established, and mass production is not possible. (The above patent document discloses a trunks type manufacturing method, but requires a very complicated manufacturing method and does not eliminate the shortcomings of the brief type.)
Then, the main subject of this invention is to provide the continuous manufacturing method of the trunks type underpants type disposable diaper which has a leg round tube part which improved the fault of a brief type underpants type diaper, An object of the present invention is to provide a continuous manufacturing method of a trunks-type pants-type disposable diaper which is excellent in design and fit around the thigh.

The present invention and effects obtained by solving the above problems are as follows.
<Invention of Claim 1>
This is a method for manufacturing a pants-type disposable diaper in which an absorbent body is continuously arranged from the front body to the back body side through the crotch part on the inner surface of the exterior body having a crotch cylinder part having a predetermined inseam length. And
In the process of supplying the first continuous sheet band composed of at least one continuous sheet in the line direction, the folded folded absorbent body has the folded edge extending from the one side edge in the width direction of the continuous sheet band. A step of intermittently fixing in the line direction sequentially so as to be separated from each other,
A step of superimposing a second continuous sheet band composed of at least one continuous sheet on the first continuous sheet band to which the absorber is fixed;
Joining the overlapping sheets at positions between the absorbent bodies adjacent in the line direction;
From the sheet width direction edge toward the absorber edge, forming a recessed portion where the edge portion is joined, thereby forming a side portion of the recessed portion as the crotch tube portion ;
A method for producing a pants-type disposable diaper, comprising:

  As described above, according to the present invention, the shorts of the brief-type pants-type diaper are improved, and the trunks-type pants-type disposable diaper having a leg tube part is particularly excellent in design and fit around the thigh. An excellent continuous process for manufacturing trunks-type pants-type disposable diapers is provided.

It is a top view of a trunks type underpants type disposable diaper of the 1st form. It is the II-II sectional view. It is sectional drawing of the trunks type underpants type disposable diaper of a 2nd form. It is a manufacturing process figure for demonstrating the manufacturing method of the 1st form of a trunks type underpants type disposable diaper. It is a manufacturing process figure for demonstrating the manufacturing method of the 2nd form of a trunks type underpants type disposable diaper. It is a perspective view which shows the example of the butting | matching part of a continuous exterior sheet. It is a manufacturing process figure for demonstrating the manufacturing method of the 3rd form of a trunks type underpants type disposable diaper. It is a manufacturing process figure for demonstrating the other manufacturing method of the 3rd form of a trunks type underpants type disposable diaper.

Next, embodiments of the present invention will be described in detail below with reference to the drawings.
(First form of pants-type disposable diaper)
The pants-type disposable diaper X1 which concerns on a 1st form is mainly comprised from the exterior body 1 and the absorber 3 fixed to this exterior body 1 inner surface so that FIG.1 and FIG.2 may understand. .
The exterior body 1 includes a front body sheet 11 located on the front side of the wearer's body and a back body side sheet 12 located on the back side of the body.

The front body sheet 11 and the back body sheet 12 are each in a plan view; the front body sheet 11 and the back body sheet 12 are recessed at the crotch position substantially at the center of the opposite side edge to the waist opening edge, and have a recessed portion Z. The length L1 of the side part serving as the side joining edge is such that the distance L2 from the bottom position of the notch to the waist opening edge WO is longer than the length of the side edge and extends from the crotch position to the leg tip side. It has a part and has a shape.
The exterior body 1 is composed of a waist opening edge, a lower portion of both side edge joint portions Ec, and a notch portion edge joint portion Zc in which the side portions of the front and rear body sheets 11 and 12 and the concave notch edge portions are joined. A characteristic crotch tube portion LP and a leg opening LO are formed on the leg tip side.
As the specific shape of the concave portion Z, an appropriate shape such as an arch shape, a triangular shape, a trapezoidal shape, a square shape, or the like can be adopted, and an arch shape, particularly a parabolic shape like the illustrated example is suitable.
In addition, the crotch cylinder part LP is designed for children, adults, etc. in the range of crotch length of about 2 to 20 cm and cylinder circumference of 15 to 60 cm in terms of design, fit around the thigh, and leakage prevention. It is better to design appropriately according to the application.

On the other hand, the front and back body sheets 11 and 12 are two-layer nonwoven fabric sheets composed of an upper nonwoven fabric 1A and a lower nonwoven fabric 1B, and suitable positions when used as an outer package between the upper nonwoven fabric 1A and the lower nonwoven fabric 1B. Various elastic elastic members are disposed on the surface to provide elasticity.
In the exterior body 1 of this embodiment, as the elastic elastic members, the waist elastic elastic members 24, 24... Arranged around the waist opening and the front body F and the back body B are spaced apart in the vertical direction. A plurality of waist elastic elastic members 25, 25,... Arranged along the horizontal direction, and a plurality of thigh elastic elastic members 26, 26 are arranged along the cylinder direction in the crotch cylinder LP. .
Further, as an example of the present embodiment other than the illustrated example, together with or instead of the elastic elastic members 26 and 26 around the thigh, from the edge of the recessed portion along the leg or along the groin, groin, etc. The example which arrange | positions the curved elastic expansion-contraction member which curves toward the waist opening edge side position of a both-sides side rather than this can be given.
The arrangement | positioning aspect of the elastic expansion-contraction members 26, 26 ... in parts other than the crotch cylinder part LP can be suitably selected from the techniques employ | adopted as a conventionally well-known underpants type disposable diaper, and can be employ | adopted.
The elastic elastic members 26, 26,... Around the thigh provided in the inseam cylinder LP are set to have a thickness of 1000 dtex or less, a tension of 150 to 400%, and an interval of 20 mm or less in consideration of the fit around the thigh. It is good to arrange.

  On the other hand, in the disposable diaper X1 of the present embodiment, the absorbent body 2 is located between the crotch joint joining position on the inner surface of the exterior body 1 and the waist opening edge We. In the illustrated form, the absorber is disposed only on the front body side, and the absorber 2 is not disposed on the back body side. The back body side is composed only of an exterior body. In this example, there is no absorber on the back body side, and it has a clean appearance, so it does not require absorption of stool or large amounts of urine, and it can be used for light incontinence, etc. Very suitable for. In addition, the underpants type disposable diaper which concerns on this form is not restricted to the example of illustration, The absorber may be arrange | positioned to both the front and back body only on the back body side. Such a form can also be taken without problems.

The absorber 3 may have a known layer structure in which an absorbent core 33 is disposed between a liquid-permeable top sheet 31 and a liquid-impermeable back sheet 32.
As the liquid-permeable top sheet 31 that covers the surface side (skin contact surface side) of the absorbent core 33, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid-permeable surface sheet 31, urine and the like are quickly absorbed, and the dry touch property is excellent.

As the liquid-impervious back sheet 32 covering the back side (non-skin contact surface side) of the absorbent core 33, a liquid-impervious plastic sheet such as polyethylene or polypropylene is used. Those having wettability are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility.
The absorbent core 33 is made of an absorbent polymer dispersed in fibers such as piled pulp and nonwoven fabric and encased by a liquid-permeable sheet such as crepe paper, nonwoven fabric sheet or perforated sheet.

  Examples of the superabsorbent polymer include carboxymethyl cellulose, polyacrylic acid and salts thereof, acrylate polymer cross-linked product, starch-acrylic acid graft copolymer, starch-acrylonitrile graft copolymer hydrolyzate, polyoxyethylene cross-linked product Products, crosslinked products of carboxymethyl cellulose, polyethylene oxide, polyacrylamide and other partially crosslinked polymers, or a copolymer of isobutylene and maleic acid are preferably used. What added the blocking inhibitor in order to suppress the blocking property by moisture absorption of a product can also be used. In addition, the superabsorbent polymer has various forms such as powder, particles, granules, pellets, sol, suspension, gel, film, and nonwoven fabric. Any of them can be used in the present invention, and a particulate material is particularly preferably used.

As the various elastic elastic members 24 to 26 used in the disposable diaper X1 of this embodiment, rubber thread is typically used. As the thread rubber, those made of synthetic rubber or natural rubber and those mainly composed of natural rubber are suitable. In addition to the rubber thread, a material having rubber elasticity, which is formed (molded) into a thread shape, a string shape, a belt shape, a net shape, a foam shape, or the like, including a generally well-known elastomer resin can be used. For example, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, and polyester can be used.
In this example, the front body and the back body are each composed of a front body sheet and a separate sheet from the back body sheet. For example, the front body is at least one of the recessed edge, the right edge, and the left edge. You may be comprised from the sheet | seat in which the time and back body continue without an adhesion part.

(Second form of pants-type disposable diaper)
As is apparent from the cross-sectional view shown in FIG. 3, the pants-type disposable diaper X <b> 2 according to the second embodiment has the same structure as the first embodiment and the exterior body 1 and the absorbent body 3, but absorbs the exterior body 1. The arrangement | positioning aspect of the body 3 is different.
In the disposable diaper X2 of this embodiment, an absorbent body is disposed on the inner surface of the exterior body 1 so as to continuously reach the back body side from the front body through the crotch part.
In this configuration, in particular, the absorbability in the crotch portion is ensured, and leakage from the leg opening is hardly caused by the presence of the leg cylinder portion. Accordingly, it is possible to sufficiently cope with a person having a relatively large amount of fluid leakage. At least, the same absorbency as a conventional diaper can be ensured.

(First form of manufacturing method of pants-type disposable diaper)
Subsequently, the 1st form of the manufacturing method of an underpants type disposable diaper is demonstrated, referring FIGS. 1-4, especially FIG.
In the manufacturing method of the diaper of this embodiment, first, as shown in FIG. 4A, the continuous exterior sheet S that becomes the exterior body 1 is continuously supplied in the line direction.
The continuous exterior sheet S constitutes the front body sheet 11 and the back body sheet 12 constituting the exterior body 1, and the continuous upper elastic sheet is interposed between the continuous upper layer nonwoven sheet and the continuous lower layer nonwoven sheet at an appropriate position. It has been done.
The method of interposing an elastic elastic member between continuous nonwoven fabric sheets is a known method. For example, a method of laminating the other nonwoven fabric sheet on the nonwoven fabric sheet while fixing the elastic elastic member with one of the nonwoven fabric sheets with a hot melt adhesive or the like, It is possible to adopt a method in which an elastic stretchable member is sandwiched between the two.
In the illustrated continuous exterior sheet, a plurality of elastic stretchable member groups 26 s and 26 s are arranged side by side at a substantially center of the line width as a boundary. These elastic elastic members 26s and 26s will later become elastic elastic members 26 and 26 around the thigh. Although not shown, the waist elastic elastic members and the like are also arranged at appropriate positions.
Moreover, although not arranged in the illustrated example, as described in the column of the first form of the pants-type disposable diaper, from the edge of the recessed portion such as around the leg or along the groin, groin, etc. In order to form a curved elastic stretchable member that curves toward the waist opening edge side position on both side portions, the elastic stretchable member can be disposed at an appropriate position.

Next, as shown in FIG. 4B, in the process of supplying the continuous exterior sheet S described above, the absorbent body 3 is sequentially and intermittently supplied in the line direction on the sheet, and hot melt adhesive or the like is used. Fix it.
In the illustrated embodiment, the absorbent body 3 has a length that is less than or equal to half of the width of the continuous outer sheet S, and the supply position of the absorbent body 3 is one edge side, in particular, the elastic elastic member group 26s. Rather than on one edge side of the sheet S.
A known apparatus may be used to supply the absorber 3 onto the sheet S, and the application of the hot melt adhesive is also applied to the position of the sheet S or the back surface of the absorber 3 immediately before supplying the hot melt adhesive onto the sheet. Can be used.
About the means to supply the absorber 3 on the sheet | seat S, it can carry out with the manufacturing apparatus of a known diaper.

Next, as shown in FIGS. 4C to 4D, the absorbent body 3 becomes an inner surface on one side of the sheet S with a position separated from one longitudinal edge 3 e of the absorbent body 3 as a boundary. Then fold continuously to the other side. In the illustrated form, the line is folded back at the center of the line width, and the elastic stretchable member groups that are spaced apart at the center in the width direction face each other.
For folding the sheet S, a sheet folding technique used for manufacturing a pants-type disposable diaper can be employed. In addition, the one side or other side at this time becomes the back body sheet | seat 12 and the front body sheet | seat 11, respectively.

As shown in FIG. 4 (E), the folded continuous sheet S ′ is heated in a subsequent process so that a convex joint Z ′ from the folded edge toward the absorber edge is formed. Joining is performed by means of fusion, thermocompression bonding, ultrasonic welding, or the like. The joining portion is preferably pitch joining. As a specific configuration of the joining portion, a known sheet joining technique can be adopted as appropriate.
The facing sheet portions are joined together so that linear joining portions E ′ and E ′ are formed at adjacent inter-absorber positions before or after the formation of the convex joining portion Z ′. In the illustrated example, as can be understood from FIG. 4E, the formation of the main joints E ′ and E ′ and the formation of the convex joint Z ′ are performed simultaneously.

These linear joint portions E ′ and E ′ are portions that become both-side joint portions Ec and Ec of the front and rear bodies, and a known side joint formation technique for a pants-type disposable diaper can be employed. As specific joining means, for example, means of heat fusion, thermocompression bonding, and ultrasonic welding can be employed. Further, the specific configuration of the joint portion, for example, the width of the joint portion, solid joint or pitch joint is an appropriate design matter, and a known technique can be appropriately employed.
Of the joining steps of the convex joint Z ′ and the side joints E ′ and E ′, at least the convex joint Z ′ is formed, and then the folded edge Se of the continuous sheet S ′ is roll cutter. Incision is made on the cut or folded edge, for example. Preferably, it is performed after both steps of the joining step of a part of the convex joint Z ′ and the side joints E ′ and E ′.

When the folded edge Se of the continuous sheet S ′ is cut, a part of the convex joint Z ′ remains. Then, at the same time as or after the cutting step of the folded edge Se of the continuous sheet S ′, the concave joint Z is formed by cutting out the convex joint portion while leaving the joint edge of the convex joint Z ′. .
In the example shown in the figure, the one-dot chain line portion on the folding edge Se side of the continuous sheet S ′ shown in FIG. 4 (F) is cut with a roll cutter, and the cutting of the folding edge Se and the formation of the recessed portion Z are performed simultaneously. ing.
After passing through at least the side joining step among the joining steps of the convex joint Z ′ and the side joint Ec, as shown in FIG. In each state where the absorber is present.

Thus, as shown in FIGS. 1 and 2, the trunks-type pants-type disposable diaper X1 having the leg-cylinder portion and the thigh-elastic elastic member shown in the first embodiment is continuously manufactured.
In the above manufacturing method, the concave notch is formed by forming the convex joint Z ′ and then cutting it into the concave notch to form the concave notch Z. Then, it is continuously folded back to the other side so as to be cut out into a concave notch from the folding edge Se toward the absorber edge 3e, and the concave notch edge is joined to form a notch Z Also good.

In the above example, it has been described that the side on which the absorbent body is fixed is the front body for convenience, but the present invention is not limited to this, and the side on which the absorbent body is fixed may be the back body.
Furthermore, in the step of fixing the absorbent body of FIG. 4B in the illustrated example, if the absorbent body is fixed to a pair so as to be separated from each other across the boundary position in the subsequent folding step, both the front and rear bodies A diaper in which an absorber is arranged is manufactured.
Further, for example, in this example, the absorbent body 3 is arranged so as to straddle the center in the width direction of the continuous outer sheet S, and one side is folded back to the other side together with the absorbent body with the width direction center of the continuous sheet as a boundary. If the recessed portion is formed from the folded edge of the sheet toward the waist opening edge side, the pants-type disposable diaper of the second form can be manufactured.

(2nd form of manufacturing method of underpants type disposable diaper)
Subsequently, the 2nd form of the manufacturing method of an underpants type disposable diaper is demonstrated, referring FIG.
In the manufacturing method of the diaper of this embodiment, the continuous exterior sheet S to be the exterior body 1 is continuously supplied in the line direction.
The continuous exterior sheet S constitutes the front body sheet 11 and the back body sheet 12 constituting the exterior body 1, and the continuous upper elastic sheet is interposed between the continuous upper layer nonwoven sheet and the continuous lower layer nonwoven sheet at an appropriate position. It has been done.
The method of interposing an elastic elastic member between continuous nonwoven fabric sheets is a known method. For example, a method of laminating the other nonwoven fabric sheet on the nonwoven fabric sheet while fixing the elastic elastic member with one of the nonwoven fabric sheets with a hot melt adhesive or the like, It is possible to adopt a method in which an elastic stretchable member is sandwiched between the two.

In the illustrated continuous exterior sheet S, a group of a plurality of elastic elastic members 26s are spaced apart from each other about the center of the line width as a boundary. This elastic elastic member 26s later becomes the elastic elastic member 26 around the thigh. Although not shown, the waist elastic elastic members and the like are also arranged at appropriate positions.
Next, as shown in FIG. 5A, in the process of supplying the continuous exterior sheet S in the line direction, a butt portion T having the same surface butt is formed at the center of the line width using a folding machine such as a holding machine. Then, the sheet S is continuously folded. At this time, the abutting portion T is set so that the elastic elastic member 26s group laid flat on the sheet faces each other.

In the form of the illustrated example, the sheet S forms a butt portion T by Z-folding the center in the line width direction. For example, as shown in FIG. Can also be formed.
Next, as shown in FIG. 5 (B), the absorbent body 3 is intermittently fixed on the sheet S so as to have a length in the line width direction and across the opening side edge e2 of the butted portion T. To go. The supply of the absorber 3 onto the sheet may be performed using a known conveyor device, and the sheet S may be fixed using a known means such as pre-application of a hot melt adhesive. A known technique can be used as a method of fixing the absorber 3. However, when the absorbent body 3 is fixed to the sheet S, the opening edge e2 of the butted portion T is sealed with an adhesive or the like except at least the absorbent body 3, preferably the sheet portion covered with the absorbent core 33.・ Do not adhere.

Next, as shown in FIG. 5 (C), one side of the sheet S together with the absorbent body 3 is continuously folded back to the other side with the opening side edge e2 of the butted portion T as a boundary, so that it is folded in two. . For folding the sheet S, a sheet folding technique of a pants-type disposable diaper can be employed. One side or the other side at this time becomes the front body sheet 11 and the back body sheet 12, respectively.
As shown in FIG. 5D, the folded continuous sheet is formed with a convex joint Z ′ from the folded edge e1 of the butted portion T toward the folded edge 3e of the absorbent body 3 in a subsequent step. The sheet portions facing each other are joined by an adhesive means such as heat fusion, thermocompression bonding, ultrasonic welding or the like. The joining portion is preferably pitch joining. As a specific configuration of the joining portion, a known sheet edge joining technique can be appropriately employed.

The body surface sheet portions are joined together so that linear joining portions E ′ and E ′ are formed at positions between adjacent absorbers 3 and 3 before or after the formation of the convex joining portion Z ′. In the illustrated example, as can be understood from FIG. 5E, the formation of the main joints E ′ and E ′ and the convex joint Z ′ are performed simultaneously.
These linear joint portions E ′ and E ′ are portions that become both-side joint portions Ec and Ec of the front and rear bodies, and a known side joint formation technique for a pants-type disposable diaper can be employed. As specific joining means, for example, means of heat fusion and thermocompression bonding can be adopted. Further, the specific configuration of the joint portion, for example, the width of the joint portion, solid joint or pitch joint is an appropriate design matter, and a known technique can be appropriately employed.
Of the joining steps of the convex joint Z ′ and the side joints E and E, at least after the convex joint Z ′ is formed, the folded edge Se (e1) of the continuous sheet S ′ is rolled. Cut or turn the cut edge with a cutter or the like. Preferably, it is performed after both steps of the respective joining steps of the convex joint Z ′ and the side joints E ′ and E ′.

When the folded edge Se (e1) of the continuous sheet S is cut, a part of the convex joint Z ′ remains. Then, at the same time as or after the cutting step of the folded edge Se (e1) of the continuous sheet S, the convex joint portion is cut into the concave notches while leaving the convex joint edges Zc to form the concave notches.
In the illustrated example, the one-dot chain line portion on the folding edge side of the continuous sheet S shown in FIG. 5 (F) is cut with a roll cutter, and the folding edge Se (e1) is cut and the recess Z is formed at the same time. I am doing so.
After passing through at least the side joining step among the joining steps of the convex joining portion Z ′ and the side joining portions E ′ and E ′, the absorber is maintained in the state where the joining at the position between adjacent absorbers is maintained. Divide into existing parts.
Thus, as shown in FIG. 5G, the trunks-type pants-type disposable diaper X2 shown in the second embodiment is continuously manufactured.

In the above manufacturing method as well, when forming the concave portion Z, the convex joint portion Z ′ is formed and then cut into the concave portion to form the concave portion Z. 3 is continuously folded back to the other side so as to be the inner surface, then cut into a concave notch from the folded edge Se (e1) toward the absorber edge 3e, and the concave notched edge is joined to A part may be formed.
Moreover, although the example of illustration is a method of manufacturing the underpants type disposable diaper of a 2nd form, in this example, if the absorber 3 is fixed to both sides on the boundary of the opening edge e2 of the butting | matching part T, for example A pants-type disposable diaper having an absorbent body on the front and back bodies is manufactured, and the absorbent body 3 is offset from one side or the other side with the opening edge e2 of the butted portion T as a boundary. On the other hand, if it fixes, the underpants type disposable diaper of the 1st form which has an absorber in either front and back body will be manufactured.

(Third form of manufacturing method of pants-type disposable diaper)
Subsequently, the 3rd form of the manufacturing method of an underpants type disposable diaper is demonstrated, referring FIGS. 1-2, 7, especially FIG.
In the manufacturing method of the diaper of this embodiment, first, as shown in FIG. 7A, first continuous exterior sheet S1 and second continuous exterior sheet S2 to be exterior body 1 are continuously supplied in the line direction.
Each continuous exterior sheet S1, S2 constitutes the front body sheet 11 and the back body sheet 12 constituting the exterior body 1, and the continuous upper layer nonwoven sheet is continuously elastic at an appropriate position between the continuous lower layer nonwoven sheet. An elastic member is interposed.

The method of interposing an elastic elastic member between continuous nonwoven fabric sheets is a known method. For example, a method of laminating the other nonwoven fabric sheet on the nonwoven fabric sheet while fixing the elastic elastic member with one of the nonwoven fabric sheets with a hot melt adhesive or the like, It is possible to adopt a method in which an elastic stretchable member is sandwiched between the two.
In the illustrated first and second continuous exterior sheets S1 and S2, a plurality of elastic elastic member groups 26s and 26s are arranged in parallel at one side edge of the line width. These elastic elastic members 26s and 26s will later become elastic elastic members 26 and 26 around the thigh. Although not shown, the waist elastic elastic members and the like are also arranged at appropriate positions.
Moreover, although not arranged in the illustrated example, as described in the column of the first form of the pants-type disposable diaper, from the edge of the recessed portion such as around the leg or along the groin, groin, etc. In order to form a curved elastic stretchable member that curves toward the waist opening edge side position on both side portions, the elastic stretchable member can be disposed at an appropriate position.

Next, as shown in FIG. 7B, in the process of supplying the first continuous exterior sheet S1, the absorbent body 3 is sequentially and intermittently supplied on the sheet in the line direction, and hot melt adhesive or the like is used. Fix it. The fixing position of the absorber 3 is a position separated from one side edge of the first continuous exterior sheet S1. In particular, when the elastic stretchable member group 26s is provided as in the illustrated example, the elastic stretchable member group 26s is provided on the other edge side of the sheet S1 rather than the elastic stretchable member group 26s.
A known apparatus may be used to supply the absorbent body 3 onto the sheet S1, and the hot melt adhesive is also applied to the position of the sheet S1 or the back surface of the absorbent body 3 immediately before being supplied onto the sheet S1. Known devices can be used.
About the means to supply the absorber 3 on the sheet | seat S1, it can carry out with the manufacturing apparatus of a known diaper.

Next, as shown in FIGS. 7C to 7D, the second continuous exterior sheet S2 is superposed on the first continuous exterior sheet S1. At this time, the arrangement edges of the elastic elastic member groups 26s of the continuous exterior sheets S1 and S2 face each other. As a technique for continuously superimposing these sheets S1 and S2, a sheet laminating technique used for manufacturing a pants-type disposable diaper can be employed. In addition, the 1st continuous exterior sheet S1 and the 2nd continuous exterior sheet S2 at this time become the front body sheet 11 and the back body sheet 12, respectively.
The continuous sheet S ′ in which the first continuous exterior sheet S1 and the second continuous exterior sheet S2 are overlapped and stacked is provided with an elastic elastic member group 26s in a subsequent step as shown in FIG. The sheets are joined by means such as heat fusion, thermocompression bonding, and ultrasonic welding so that a convex joint Z ′ from the edge to the absorber edge is formed. The joining portion is preferably pitch joining. As a specific configuration of the joining portion, a known sheet joining technique can be adopted as appropriate.

The facing sheet portions are joined together so that linear joining portions E ′ and E ′ are formed at adjacent inter-absorber positions before or after the formation of the convex joining portion Z ′. In the illustrated example, as can be understood from FIG. 7E, the formation of the main joints E ′ and E ′ and the formation of the convex joint Z ′ are performed simultaneously.
These linear joint portions E ′ and E ′ are portions which become both side edge joint portions Ec and Ec of the front and rear bodies, and a known side edge joint formation technique of a pants-type disposable diaper can be employed. As specific joining means, for example, means of heat fusion, thermocompression bonding, and ultrasonic welding can be employed. Further, the specific configuration of the joint portion, for example, the width of the joint portion, solid joint or pitch joint is an appropriate design matter, and a known technique can be appropriately employed.

As shown in FIG. 7 (F), after at least the convex joint Z ′ is formed in each of the joint steps of the convex joint Z ′ and the side joints E ′ and E ′, By using a roll cutter or the like, the concave joint Z is formed by cutting the convex joint portion into a concave notch while leaving the joint edge of the convex joint Z ′.
After at least the side joining step among the joining steps of the convex joint Z ′ and the side joining Ec, as shown in FIG. 7 (G), joining at positions between adjacent absorbers In each state where the absorber is present.
Thus, as shown in FIGS. 1 and 2, the trunks-type pants-type disposable diaper X1 having the leg-cylinder portion and the thigh-elastic elastic member shown in the first embodiment is continuously manufactured.

In the above manufacturing method, in forming the concave notch, the convex joint portion Z ′ is formed and then cut into the concave notch to form the concave notch Z. However, the first continuous exterior sheet S1 and the second continuous sheet are formed. After the outer sheet S2 is overlaid, the concave notch Z may be formed by cutting out a concave notch from one edge toward the absorber edge 3e and joining the notched edge.
Moreover, although the absorber was fixed to 1st continuous exterior sheet S1 for the convenience of description in the said example, of course, you may fix an absorber to 2nd continuous exterior sheet.

Further, in the step of FIG. 7B, the absorbent body is also fixed to the second continuous sheet in the same manner as the first continuous exterior sheet S1, and the absorption of both sheets is performed in the steps shown in FIGS. If the sheets S1 and S2 are overlapped with each other so that the body fixing surfaces face each other, a first-type pants-type disposable diaper having absorbent bodies on the front and back bodies is manufactured.
On the other hand, in the step shown in FIG. 7B in the present embodiment, the bi-folded absorbent body is substantially parallel so that the folded edge is separated from the elastic elastic member group 26s of the first continuous exterior sheet S1. In the step shown in FIG. 7 (E), a convex joint Z ′ from the edge where the elastic elastic member group 26s is arranged to the folding edge of the absorber is formed in the process shown in FIG. If the recessed part Z is formed based on this, the underpants type disposable diaper of a 2nd form will be manufactured continuously (embodiment of the present invention).

Further, in the embodiment shown in FIG. 7, the first continuous sheet (strip) S1 and the second continuous sheet (strip) S2 are each composed of one continuous sheet. In this embodiment, for example, As shown in FIG. 8, the first continuous sheet can be a first continuous sheet band S1 composed of a plurality of continuous sheets S1 ′, S1 ″. Further, the second continuous sheet can also be a second continuous sheet band S2 composed of a plurality of continuous sheets S2 ′ and S2 ″.
Adhesion between the sheets constituting the continuous sheet bands S1 and S2 can be performed by using a known sheet adhesion technique such as thermal fusion, thermocompression bonding, ultrasonic welding, and hot melt adhesive.

  In the example of the manufacturing method of FIG. 8, the front body, the rear body are designed by appropriately changing the material of each continuous sheet S1 ′, S1 ″, S2 ′, S2 ″, the arrangement form of elastic elastic members, and the like. Each of the body parts is composed of a plurality of exterior sheet members having different characteristics, and the degree of freedom in designing the diaper is increased. In the example of FIG. 8, the first and second continuous sheet bands are each composed of two continuous sheets. However, the present invention is not limited to this, and can be composed of an appropriate number of continuous sheets. . Further, the steps other than forming a continuous sheet band with a plurality of continuous sheets are the same as those in the manufacturing method example shown in FIG.

  The present invention can be used for a manufacturing method of a pants-type disposable diaper.

DESCRIPTION OF SYMBOLS 1 ... Exterior body, 1A ... Upper layer nonwoven fabric sheet, 1B ... Lower layer nonwoven fabric sheet, 3 ... Absorber, 11 ... Front body sheet, 12 ... Back body sheet, 24 ... Elastic waist elastic member, 25 ... Elastic waist Shinjuku member, 26 ... Elastic elastic member around thigh, 26s ... Continuous elastic elastic member, 31 ... Liquid-permeable top sheet, 32 ... Liquid-impervious back sheet, 33 ... Absorbing core, Ec ... Both side edge joint, Zc ... Notch Edge joint, E ... side, Z ... concave notch, Ze ... concave notch, Z '... convex joint, We ... waist opening edge, WO ... waist opening, LO ... leg opening, LP ... Inseam cylinder part, L1 ... Side length, L2 ... Distance from bottom position of recess to waist opening edge WO, X1, X2 ... Pants-type disposable diaper, S ... Continuous exterior sheet, S1 ... First continuous exterior sheet, S2 ... second continuous exterior sheet, S '... continuous sheet, Se ... continuous Over bets folded edge, T ... butt section, e1 ... butt portion folded side edges, e2 ... butt opening side edge, 3e ... one edge or folding edge of the absorbent body of the absorbent body.

Claims (1)

This is a method for manufacturing a pants-type disposable diaper in which an absorbent body is continuously arranged from the front body to the back body side through the crotch part on the inner surface of the exterior body having a crotch cylinder part having a predetermined inseam length. And
In the process of supplying the first continuous sheet band composed of at least one continuous sheet in the line direction, the folded folded absorbent body has the folded edge extending from the one side edge in the width direction of the continuous sheet band. A step of intermittently fixing in the line direction sequentially so as to be separated from each other,
A step of superimposing a second continuous sheet band composed of at least one continuous sheet on the first continuous sheet band to which the absorber is fixed;
Joining the overlapping sheets at positions between the absorbent bodies adjacent in the line direction;
From the sheet width direction edge toward the absorber edge, forming a recessed portion where the edge portion is joined, thereby forming a side portion of the recessed portion as the crotch tube portion ;
A method for producing a pants-type disposable diaper, comprising:

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