WO2013073411A1 - Method for producing underwear-type clothing article - Google Patents

Abstract

This production method produces an underwear-type clothing article (1) provided with a covering material (11) having a side seal part (S). In this production method, the continuous body of the covering material (11) in which elastic members (14 to 16) are arranged in an extended state is overlapped between band-shaped sheets. Then, the overlapped continuous body of the covering material (11) is subjected to heat sealing by melting the constituent fibers of the band-shaped sheets of the covering material (11) while extending the elastic members (14 to 16) at an interval, and a sealed part (S') is formed on the heat sealed region. Subsequently, the melted constituent fibers are forcibly cooled and a heat sealed region (HT) is cooled while extending the elastic members (14 to 16). Finally, the underwear-type clothing article (1) having the side seal part (S) is formed by cutting off the sealed part (S').

Description

Manufacturing method for pants-type wearing articles

The present invention relates to a method for producing a pants-type wearing article such as a pants-type disposable diaper.

For example, pants-type wearing articles such as pants-type disposable diapers are folded in two so that the back side and the abdomen are overlapped after the absorbent main body is attached to the outer packaging material, and both side edges of the back side And the both side edges of the ventral part are joined to form a pants-type. Here, the bonding of both side edges is not peeled off during wearing, and from the viewpoint of peeling and using at the time of undressing, an appropriate bonding strength is required, and as a bonding method for obtaining such a bonding strength, For example, a joining method by heat sealing in which a base sheet of an outer packaging material composed of a composite fiber including a heat-sealing fiber is melt-bonded has been generally proposed (see Patent Document 1).

Patent Document 1 describes a heat sealing method in which a plurality of sealing rolls each having a sealing blade are provided on the peripheral surface of one opposing roll, and the same sealing portion is sealed a plurality of times. ing. Certainly, as in the technique described in Patent Document 1, if a plurality of sealing rolls are provided on the peripheral surface of one opposing roll and the same sealing portion is sealed a plurality of times, heat sealing is used. Sufficient seal strength can be obtained.

However, in Patent Document 1, the relationship between the elastic member such as the waist elastic member, the leg elastic member, the waist elastic member and the heat seal, and the product cutting process for forming individual pant-type wearing articles are included. There is no description at what timing. For example, if the product cutting process is performed after the heat sealing described in Patent Document 1 is performed in a state where the elastic member is extended in an extended state, the elastic member held in the extended state is absorbed by each individual member. The stretched state is released when it is cut into a functional article, and the heat-sealed fibers of the base sheet are contracted so as to narrow the width of the heat-sealed region in the melted heat-sealed region, and then solidified. As a result, the appearance of the side seal portion is impaired, and the soft texture is impaired, resulting in a hard touch.

Therefore, the applicant of the present invention has first made an absorbent article that performs heat sealing in the heat sealing region after the shrinkage function is not expressed by dividing at least a part of the elastic member in the heat sealing region. A manufacturing method was proposed (see Patent Document 2).

JP 2000-255518 A JP 2006-87564 A

However, Patent Document 2 specifically describes the conditions under which the base sheet is transported and heat-sealed or product-cutting steps are performed after the contraction function of the elastic member is not expressed. Absent. Therefore, if the heat-sealing fiber of the base sheet is in a molten state and the heat-sealed area becomes very soft by heat sealing, if any shrinkage force remains in the elastic member in the area where the shrinkage function is not expressed. In some cases, the heat-shrink region is shrunk so as to narrow the width of the heat-sealed region, and then solidifies to give a hard touch. There is room for further improvement.

Therefore, the present invention has been made in view of the above problems, and while effectively obtaining a sufficient sealing strength by heat sealing, it effectively avoids the elastic member from contracting in the region of heat sealing, It aims at providing the underpants type wearing article which has a side seal part excellent in the texture.

The present invention is a method for producing a pants-type wearing article, in which a pants-type wearing article having an outer packaging material having a pair of side seal portions is continuously produced. In the method for manufacturing a pant-type wearing article according to the present invention, a continuous body of the outer packaging material in which a plurality of elastic members are arranged in an expanded state between the belt-like sheets overlaps on both sides in the transport direction of the continuous body of the outer packaging material. After the superposition, the continuous body of the overwrapping material is melted in the state of the elastic member and the constituent fibers of the belt-like sheet of the overwrapping material are stretched at a predetermined interval in the transport direction. It includes a sealing step of heat sealing to form a seal portion in the heat seal region. The manufacturing method of the pants-type wearing article of the present invention includes a cooling step of forcibly cooling the constituent fibers melted by heat sealing and cooling the heat sealing region in a state where the elastic member is stretched, and the heat sealing. A separation step of separating the seal portion in a region to form the pants-type wearing article having the side seal portion.

FIG. 1 is a perspective view showing a pants-type disposable diaper obtained by an embodiment of the present invention. FIG. 2 is a developed plan view showing a state where the pants-type disposable diaper shown in FIG. 1 is developed and extended. FIG. 3 is an enlarged plan view of a side seal portion of the pants-type disposable diaper shown in FIG. 1. FIG. 4 is a schematic view showing a processing apparatus suitably used for carrying out the manufacturing method of the first embodiment of the present invention. FIG. 5 is a cross-sectional view showing the positional relationship between the seal block of the anvil roll and the cooling nozzle provided in the processing apparatus shown in FIG. 4 and the diaper continuum. FIG. 6 is a perspective view schematically showing an example of a process for producing a pants-type disposable diaper according to an embodiment of the present invention. FIG. 7 is a schematic view showing a processing apparatus suitably used for carrying out the manufacturing method of the second embodiment of the present invention. FIG. 8 is a perspective view schematically showing another example of a process for producing a pants-type disposable diaper according to an embodiment of the present invention.

Detailed Description of the Invention

Hereinafter, the manufacturing method of the underpants type wearing article of the present invention is explained based on the preferred 1st embodiment, referring to drawings.
First, a pants-type disposable diaper manufactured by the manufacturing method of the first embodiment will be described with reference to FIGS.
A pants-type disposable diaper 1 shown in FIG. 2 includes a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3, and a liquid-retaining absorbent core 4 interposed between both sheets 2 and 3. A substantially vertically long absorbent main body 10 and an outer packaging material 11 disposed on the back sheet 3 side of the absorbent main body 10 and fixing the absorbent main body 10.
In the present specification, “heat seal” includes not only a heat seal but also a high frequency seal and an ultrasonic seal.

As shown in FIG. 2, the absorbent main body 10 includes an hourglass-shaped absorbent core 4 that is bound inward in the center in the longitudinal direction. The absorbent core 4, the rectangular topsheet 2, and the rectangular backsheet 3 is formed into a vertically long shape. As the surface sheet 2, the back surface sheet 3, and the absorptive core 4, the thing similar to what was conventionally used for this kind of diaper can be used, respectively. For example, as the top sheet 2, liquid permeable sheets such as various nonwoven fabrics and perforated films subjected to hydrophilic treatment can be used, and as the back sheet 3, a thermoplastic resin film such as a polyethylene film, A liquid-impermeable or water-repellent sheet such as a laminate of the film and the nonwoven fabric can be used. The absorbent core 4 is composed of particles of a superabsorbent polymer and a fiber material, and is made of tissue paper (not shown). Can be used. Side cuffs 5 and 5 made of a liquid-resistant or water-repellent and breathable material are arranged on the left and right sides of the absorbent main body 10 in the longitudinal direction, and the free end portions of the side cuffs 5 are arranged. The side cuff elastic member 51 is arranged in an extended state in the vicinity of, and when the diaper is worn, the elastic member 51 contracts to form a three-dimensional gather where the side cuff 5 stands.

As shown in FIG. 2, the outer packaging material 11 has an hourglass shape in which both side edges are bound inwardly in the center in the longitudinal direction, and defines the outline of the diaper (see FIG. 1). . As shown in FIG. 2, the diaper 1 is positioned between the abdominal side A disposed on the wearer's abdomen and the dorsal side B disposed on the dorsal side during wearing in the longitudinal direction in the deployed state. It is divided into the crotch part C. In the outer packaging material 11, both side edges A1 and A2 in the ventral side A and both side edges B1 and B2 in the back side B are joined to each other, and as a result, as shown in FIG. A pair of side seal portions S, S, a waist opening WO and a pair of leg openings LO are formed. Thus, the pants-type disposable diaper 1 manufactured by the manufacturing method of the first embodiment includes an outer packaging material 11 having a pair of side seal portions S, S.

As shown in FIGS. 2 and 3, the outer packaging material 11 has a structure in which an outer layer sheet 12 and an inner layer sheet 13 disposed on the inner surface side (absorbent body 10 side) of the outer layer sheet 12 are laminated. Yes. The outer layer sheet 12 forms the outer surface of the diaper 1, and the inner layer sheet 13 is disposed on the inner surface side of the outer layer sheet 12 and is partially joined. In the diaper 1, the outer layer sheet 12 extends further in the longitudinal direction than a region where a plurality of waist elastic members 14 described later are sandwiched and fixed by the outer layer sheet 12 and the inner layer sheet 13, as shown in FIG. 2. This extended extension region is folded back toward the absorbent main body 10 to cover the longitudinal end of the absorbent main body 10, and an adhesive (not shown) is applied. Is fixed through. As the outer layer sheet 12 and the inner layer sheet 13 of the outer packaging material 11, various sheet materials conventionally used for this type of article can be used without particular limitation. When the sheet material is a nonwoven fabric, it is preferably a single-layer sheet or a laminated sheet made of an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a melt blown nonwoven fabric, or the like from the viewpoint of flexibility.

As shown in FIGS. 2 and 3, the outer packaging material 11 includes elastic members 14, 15 and 16 between the outer layer sheet 12 and the inner layer sheet 13. The outer packaging material 11 has a plurality of waist elastic members 14 and a plurality of waistline elastic members 15 arranged along the width direction on the stomach side A and the back side B of the diaper 1. . Further, the outer packaging material 11 has a plurality of leg portion elastic members 16 at the periphery of the leg opening LO. As the elastic members 14, 15, and 16, those obtained by forming a stretchable material such as natural rubber, polyurethane-based resin, and foamed urethane-based resin into a thread shape (thread rubber) or a belt shape (flat rubber) are preferably used.

The waist elastic member 14 is arranged and fixed in a stretched state on the waist part located outward from both ends in the longitudinal direction of the absorbent main body 10 in the longitudinal direction of the diaper 1 in the deployed state, and these contract. Thereby, a waist gather is formed in a waist part.
The waistline elastic member 15 is arranged in an expanded state and fixed to a waistline portion located inwardly (on the crotch C side) from both ends in the longitudinal direction of the absorbent main body 10 in the longitudinal direction of the diaper 1 in the deployed state. When these shrink, a waistline gather is formed in the waistline part. In the diaper 1 </ b> A, the waistline elastic member 15 in each of the abdominal side A and the back side B is cut at a portion overlapping the absorbent main body 10.
The leg elastic member 16 is arranged and fixed in an extended state from the abdominal side A to the crotch C, and another leg elastic member 16 extends from the back side B to the crotch C. Leg gathers are formed at the peripheral edge of the leg opening LO by contracting them. In the diaper 1A, the leg elastic members 16, 16 are cut at the center in the width direction of the crotch part C and divided into left and right.

In joining the both side edges A1, A2 of the ventral side A and the side edges B1, B2 of the back side B, the outer layer sheet 12, the inner layer sheet 13, and the elastic members 14, 15 between these sheets 12, 13 are used. , 16 are joined to each other by an adhesive such as a hot melt adhesive and a heat seal including a high frequency seal and an ultrasonic seal to form side seal portions S, S of the diaper 1 (FIG. 1). In the side seal portion S, the plurality of waist elastic members 14, the plurality of waistline elastic members 15, and the plurality of leg elastic members 16 are solidified in the extended state, and are solidified in the extended state. The elastic members 14, 15 and 16 thus made are in a state in which contractility is no longer exhibited (see FIG. 3). Here, “solidified” means a state in which the side seal portion S of the diaper 1 is not broken by the contraction force of the elastic members 14, 15, 16. Further, as shown in FIG. 3, the width of the side seal portion S is not contracted and is substantially constant, the appearance of the side seal portion S is improved, and the soft texture is excellent. .

Next, a preferred embodiment of the method for producing a pants-type wearing article of the present invention will be described with reference to FIGS. 4 to 5 by taking as an example the case of producing the pants-type disposable diaper 1 described above.
FIG. 4 schematically shows a processing apparatus 7A that is preferably used in the method for manufacturing the diaper 1 of the first embodiment.

As shown in FIG. 4, the processing apparatus 7A is arranged to face the first to third seal rolls 71, 72, 73, the cooling nozzle 6 and the product cut roll 74, and the rolls 71 to 74 and the cooling nozzle 6. An anvil roll 75 is provided. That is, in the processing apparatus 7A, the first to third seal rolls 71, 72, 73, the cooling nozzle 6, and the product cut roll 74 are sequentially arranged on the peripheral surface 75a of the same anvil roll 75. Thus, the processing apparatus 7A uses a plurality of seal rolls. The cooling nozzle 6 is a part to which normal temperature compressed air or cooled compressed air is injected. Each of the rolls 71 to 74 and 75 is controlled in rotational direction, heating temperature, and the like by a control means (not shown) provided in the processing apparatus 7A, and is controlled to rotate in the direction indicated by the arrow in FIG.

As shown in FIG. 4, seal blocks 710, 720, and 730 are attached to the first to third seal rolls 71, 72, and 73, respectively. In the processing apparatus 7A, two seal blocks 710 of the first seal roll 71 are attached at positions that divide the roll circumferential direction into two equal parts, as shown in FIG. Each seal block 710 has a shape that is long in the axial direction of the first seal roll 71. At the tip of each seal block 710, two convex portions (not shown) are formed along the axial length direction. The seal blocks 720 and 730 of the second to third seal rolls 72 and 73 are the same as the seal block 710 of the first seal roll 71. The heating temperature of the seal blocks 710, 720, and 730 is controlled by the control means (not shown) provided in the processing apparatus 7A. A pair of seal portions S ′ and S ′ formed by being sealed by two seal blocks 710, 720, and 730 and an anvil block 750 of an anvil roll 75 to be described later are separated as will be described later, and a side seal portion of the diaper is separated. S. The seal surfaces of the seal blocks 710, 720, and 730 are provided with a large number of fine convex portions, and a seal pattern pattern is formed on the side seal portion S of the diaper. In the processing apparatus 7A, two seal blocks 710, 720, and 730 are attached to each of the seal rolls 71 to 73, but the number is not limited to two.

The cooling nozzle 6 is arrange | positioned so as to oppose the surrounding surface 75a of the anvil roll 75, as shown in FIG. The cooling nozzle 6 has a structure capable of injecting cooling air over a width wider than the width of the heat seal region HT formed in the diaper continuum 100 folded in a later-described manner. The cooling air sprayed from the cooling nozzle 6 may be sprayed intermittently or continuously according to the heat seal region HT of the diaper continuous body 100 described later. As long as the temperature of the cooling air is lower than the melting point and the softening point of the constituent fibers of the belt-like sheet, the cooling air may be at room temperature.

When cooling on the same apparatus like the processing apparatus 7A, the cooling nozzle 6 injects cooling air from above the anvil block 750 of the anvil roll 75 to be described later, so the temperature of the air is too low. And the temperature of the anvil block 750 is lowered. Therefore, when cooling on the same apparatus as the processing apparatus 7A, the cooling nozzle 6 causes the cooling air to be at a temperature below room temperature, specifically, 26 ° C. or less and about 0 ° C. or more. Is preferred.
Moreover, when cooling on the same apparatus like the processing apparatus 7A, you may make it cool from the lower anvil roll 75 side. In that case, the cooling air from the upper cooling nozzle 6 may be constantly jetted, but the cooling air from the lower timing when the material leaves the anvil block 750 so as not to cool the anvil block 750. It is preferable to be injected at

The cutter blade 740 is attached to the product cut roll 74 as shown in FIG. In the processing apparatus 7A, two cutter blades 740 of the product cut roll 74 are attached at positions that divide the roll circumferential direction into two equal parts, as shown in FIG. Each cutter blade 740 is arranged over the axial length direction of the product cut roll 74, and cuts the diaper continuous body 100 and divides it into individual diapers 1. The temperature of the cutter blade 740 is not controlled, but may be controlled by the control means (not shown) provided in the processing apparatus 7A as necessary. In the processing apparatus 7A, two cutter blades 740 are attached to the product cut roll 74, but the number is not limited to two.

As shown in FIG. 4, an anvil block 750 is attached to the anvil roll 75. In the processing apparatus 7A, six anvil blocks 750 of the anvil roll 75 are attached at positions that divide the roll circumferential direction into six equal parts, as shown in FIG. Each anvil block 750 has a shape that is long in the axial direction of the anvil roll 75. As shown in FIG. 4, the tip 750a of each anvil block 750 is flush with the peripheral surface 75a of the anvil roll 75 (there is no flat between the tip 750a of the anvil block 750 and the peripheral surface 75a of the anvil roll 75). From the viewpoint of efficiently solidifying the molten state of the constituent fibers of the belt-like sheet in the heat seal region HT of the diaper continuous body 100 in the cooling step described later, from the peripheral surface 75a of the anvil roll 75 It is preferable that it is arranged slightly inside (see FIG. 5). From such a viewpoint, in the processing apparatus 7A, the anvil block 750 may be movable up and down from the peripheral surface 75a of the anvil roll 75 or from the inner side to the peripheral surface 75a. In that case, an elevating tool (not shown) is connected to the anvil block 750, and the elevating timing of the elevating tool (not shown) is controlled by the control means (not shown) provided in the processing apparatus 7A.
The heating temperature of the anvil block 750 is controlled by the control means (not shown) provided in the processing apparatus 7A. In the processing apparatus 7A, six anvil blocks 750 are attached, but the number is not limited to six.

Two convex portions (not shown) arranged at the tips of the seal blocks 710, 720, 730 of the first to third seal rolls 71, 72, 73, the anvil block 750 of the anvil roll 75, and the product cut roll The cutter blade 740 of 74 and the anvil block 750 of the anvil roll 75 are periodically opposed to each other as shown in FIG. 4 as the rolls 71 to 74, 75 are rotated by the control means (not shown). ing. For this reason, the two convex portions (not shown) of the first seal roll 71 and the region where the heat seal is applied by the anvil block 750 to form the seal region, the two convex portions of the second seal roll 72 are formed. A heat seal is applied to the sealing region by the shape portion (not shown) and the anvil block 750, and further, the two protruding portions (not shown) and the anvil block 750 of the third seal roll 73 are used to seal the sealing region. Heat seal is applied to the product cut roll 74 so that the cutter blade 740 and the anvil block 750 of the product cut roll 74 are cut so as to separate the pair of seal portions S ′ and S ′.

In the processing apparatus 7A, the anvil block 750 of the anvil roll 75 is opposed to the seal blocks 710, 720, 730 of the first to third seal rolls 71, 72, 73 and the cutter blade 740 of the product cut roll 74. Is controlled by the control means (not shown) so that there is no step between the tip 750a of the anvil block 750 and the peripheral surface 75a of the anvil roll 75, but the cooling from the cooling nozzle 6 is controlled. The anvil block 750 of the anvil roll 75 is moved inwardly from the peripheral surface 75a of the anvil roll 75 by the control means (not shown) at the timing when the air is injected into the heat seal region HT of the diaper continuous body 100. It is controlled. Since it is controlled in this way, cooling can be performed in a state where the material to be welded is avoided from a seal portion in a heat seal region HT described later, and seal portions S ′ and S ′ described later can be effectively formed. In the processing apparatus 7A, a lifting tool (not shown) is connected to the anvil block 750. However, when a lifting tool (not shown) is not connected, the anvil block 750 is connected to the anvil block 750 from the same viewpoint. It is particularly preferable that the anvil block 750 is fixed at a position outside the peripheral surface 75a of the anvil roll 75, or a position flat with the peripheral surface 75a. It may be fixed with.

Further, as shown in FIG. 4, the processing apparatus 7 </ b> A includes an introduction roll 76 that introduces the continuous body 100 of the diaper 1 onto the anvil roll 75. In the processing apparatus 7A, the continuous body 100 of the diaper 1 is placed on the peripheral surface 75a of the anvil roll 75 so that the tension in the transport direction of the continuous body 100 of the diaper 1 introduced onto the anvil roll 75 can be constant. Are provided with a plurality of suction holes (not shown) for adsorbing to the peripheral surface 75a of the anvil roll 75. A number of suction holes (not shown) are connected to a suction machine (not shown) arranged outside the anvil roll 75, and the suction machine (not shown) is the control means (not shown) provided in the processing apparatus 7A. The suction force is controlled by. In the processing apparatus 7A, a large number of suction holes (not shown) are provided, but instead of suction holes (not shown) so that the tension in the transport direction of the diaper 1 continuous body 100 can be kept constant. Alternatively, another means for holding the continuous body 100 of the diaper 1 on the peripheral surface 75a of the anvil roll 75 may be provided together with a suction hole (not shown). As another means, a pair of hand-shaped holders (not shown) that can be moved up and down from the peripheral surface 75a of the anvil roll 75 can be cited. By providing such a hand-shaped holder (not shown) of the heel, both sides of the diaper 1 continuous body 100 in the conveying direction are formed by the hand-shaped tip of the pair of heels and the peripheral surface 75a of the anvil roll 75. The diaper 1 continuous body 100 can be held on the peripheral surface 75a of the anvil roll 75, and the tension of the diaper 1 continuous body 100 in the transport direction can be kept constant. The raising / lowering timing of the hand-shaped holder (not shown) of the bag is controlled by the control means (not shown) provided in the processing apparatus 7A.

Furthermore, as shown in FIG. 4, the processing apparatus 7 </ b> A includes a product reversing machine 77 on the peripheral surface 75 a of the anvil roll 75 and after the product cut roll 74. The product reversing machine 77 includes a plurality of suction heads (not shown) that individually suck the diapers 1 cut by the cutter blade 740 of the product cut roll 74. When a packaging process is provided as a subsequent process of the seal and cutter device 7, each suction head (not shown) rotates with the rotation of the product reversing machine 77 so that the suction head (not shown) matches the transport direction of the packaging process. The sucked diaper 1 may be turned 90 ° around an axis perpendicular to the suction surface (not shown).

As described above, the control means (not shown) provided in the processing apparatus 7A is configured to rotate the first to third seal rolls 71, 72, 73, the product cutting roll 74, the rotation speed of the anvil roll 75, the seal block 710, 720, 730, cutter blade 740 and heating temperature of anvil block 750, and the suction force of a suction machine (not shown) to which a suction hole (not shown) is connected, and / or a hand-like holder for scissors ( (Not shown) is controlled. Further, as described above, the control means (not shown) provided in the processing apparatus 7A controls the timing of raising and lowering the anvil block 750 of the anvil roll 75 when it has an elevation mechanism. The control means (not shown) includes a CPU such as a microcomputer that substantially controls the entire processing apparatus 7A, a ROM that stores necessary fixed information such as a control program executed by the CPU and various data, A RAM used as a work area at the time of execution of processing by the CPU, an operator input device for the numerical control device, and the like are provided. Therefore, the processing conditions in the sealing process described later using the first to third seal rolls 71, 72, 73 and the processing conditions in the cutting process described later using the product cut roll 74 can be adjusted independently. It has become. Note that the synchronization timing of each roll and the lifting / lowering timing of the hook-like holder (not shown) may be configured by a mechanism using a servo motor, a cam mechanism, a gear, a timing belt, or the like.

A manufacturing method for manufacturing the pants-type disposable diaper 1 using the processing apparatus 7A described above will be described.

As shown in FIG. 6, the manufacturing method of the pants-type disposable diaper 1 of the first embodiment is a manufacturing method of a so-called cross-flow type pants-type disposable diaper, and the outer packaging material 11 folded in half using the processing device 7A. In a state where the elastic members 14, 15 and 16 are stretched at a predetermined interval in the conveying direction, the continuum is melt-sealed and heat-sealed to seal the heat-sealing region HT. Forming the portion S ′, forcibly cooling the constituent fibers melted by heat sealing, cooling the heat sealing region HT in a state where the elastic members 14, 15 and 16 are extended, and sealing portions in the heat sealing region HT The diaper 1 having the side seal portion S is formed by separating S ′. This will be specifically described below.

First, as shown in FIG. 6, a strip-shaped outer layer sheet 12 continuously supplied from an original fabric roll (not shown), and a strip-shaped inner layer sheet 13 continuously supplied from an original fabric roll (not shown) The waist elastic member 14 that forms the waist gather, the waist elastic member 15 that forms the waist gather, and the leg elastic member 16 that forms the leg gather are each stretched in a stretched state. Distribute several. At this time, a hot melt adhesive is continuously or intermittently applied to the waist elastic member 14 and the waist elastic member 15 via an adhesive coating machine (not shown), and the leg elastic member 16 is applied. Are arranged while forming a predetermined leg-circumferential pattern via a known swing guide (not shown) that reciprocates perpendicular to the sheet flow direction. Further, before the belt-like outer layer sheet 12 and the belt-like inner layer sheet 13 are overlaid, either one of the two sheets or a predetermined part of the opposite surface of both sheets, specifically, heat sealing described later. The hot melt adhesive 8 is intermittently applied by an adhesive coating machine (not shown) to a region including a region corresponding to the region HT and a region corresponding to a region where the absorbent main body 10 described later is disposed. .

And as shown in FIG. 6, between the pair of nip rolls 9, 9, a belt-shaped outer layer sheet 12 in which a waist elastic member 14, a waistline elastic member 15 and a leg elastic member 16 are sandwiched in an expanded state, and a belt-shaped outer layer sheet 12 By feeding and pressurizing the inner layer sheet 13, a continuous body of the outer packaging material 11 in which a plurality of elastic members 14, 15, 16 are arranged in an expanded state between the belt- like sheets 12, 13 is formed (continuation of the outer packaging material 11 Body formation step). Thereafter, in the first embodiment, a plurality of waistline elastic members 15 and a plurality of leg portions are formed by using elastic member precutting means (not shown) so as to correspond to positions where the absorbent main body 10 described later is disposed. The elastic member 16 is pressed and divided into a plurality of pieces so that the contraction function is not expressed. Examples of the elastic member pre-cut means (not shown) include an elastic member dividing portion used in the method for manufacturing a composite elastic member described in JP-A-2002-253605.

Next, as shown in FIG. 6, an adhesive such as a hot-melt adhesive is applied in advance to the absorbent main body 10 manufactured in a separate process, rotated 90 degrees, and on the continuous inner layer sheet 13 of the outer packaging material 11. It is intermittently supplied and fixed to form a diaper 1 continuous body (a continuous body of worn articles) 100 (arrangement step of absorbent main body). Hereinafter, the continuous body in which the absorbent main body 10 is fixed to the continuous body of the outer packaging material 11 is also referred to as the continuous body 100 of the diaper 1. The fixing adhesive may be applied on the inner layer sheet 13 instead of the absorbent main body 10.

Next, as shown in FIG. 6, a leg hole LO ′ is formed inside the annular portion surrounded by the leg elastic member 16 in the continuous body of the outer packaging material 11 in which the absorbent main body 10 is arranged (leg hole). Forming step). The leg hole forming step is conventionally performed using a method similar to the method in the manufacturing method of this type of article such as a rotary cutter and a laser cutter. In the first embodiment, the leg hole forming step is provided after the absorbent body arranging step, but the leg hole forming step may be provided immediately before the absorbent main body 10 arranging step.

Next, as shown in FIG. 6, superposition is performed so that both sides in the transport direction of the continuous body of the outer packaging material 11 overlap (superposition process). In the superposition process of the first embodiment, after both side portions of the continuous body of the outer packaging material 11 are folded so that both ends in the length direction of the absorbent main body 10 are folded, the continuous body of the outer packaging material 11 The absorbent body 10 is folded in half. In addition, when the absorptive main body 10 is biased to the ventral part A in the pants-type disposable diaper 1, both ends in the length direction of the absorptive main body 10 may not overlap each other. Moreover, the width | variety of the strip | belt-shaped outer-layer sheet 12 and the strip | belt-shaped inner-layer sheet 13 is made the same, and the both sides of the continuous body of the outer packaging material 11 do not need to be folded.

After that, using the processing device 7A, the elastic member 14, 15, 16 is stretched at a predetermined interval in the conveying direction of the continuous body of the outer packaging material 11 folded in half (the continuous body 100 of the diaper 1). Thus, the constituent fibers of the belt- like sheets 12 and 13 of the outer packaging material 11 are melted and heat-sealed to form the seal portions S ′ and S ′ in the heat-sealing region HT (sealing process). The sealing process will be specifically described below. As shown in FIG. 4, the diaper 1 continuum 100 folded in half is introduced onto an anvil roll 75 via an introduction roll 76. The continuous body 100 of the diaper 1 introduced on the anvil roll 75 is an anvil roll 75 by a suction hole (not shown) on the peripheral surface of the anvil roll 75 and / or a pair of hand-shaped holding tools (not shown). Is held on the peripheral surface. When the anvil roll 75 rotates, the diaper 1 continuous body 100 is transported with the tension in the transport direction of the diaper 1 continuous body 100 constant.

Then, as shown in FIG. 4, the anvil roll 75 is rotated to convey the diaper 1 continuous body 100 between the seal block 710 of the first seal roll 71 and the anvil block 750 of the anvil roll 75. Then, in a state where the elastic members 14, 15 and 16 are extended, the two outer layer sheets 12 and the two inner layer sheets 13 which are overlapped are heat-sealed by the seal block 710 and the anvil block 750, and the outer layer sheet 12 and the inner layer sheet are heat-sealed. The respective constituent fibers are melted to form the seal portions S ′ and S ′ in the first heat seal region HT.

Next, in the first embodiment, as shown in FIG. 4, the diaper 1 continuous body 100 in which the first heat seal region HT is formed is held on the peripheral surface of the anvil roll 75 to hold the elastic members 14, 15, In the state where 16 is extended, the anvil roll 75 is rotated and conveyed between the seal block 720 of the second seal roll 72 and the anvil block 750 of the anvil roll 75. Then, in a state where the elastic members 14, 15, 16 are extended, the two outer layer sheets 12 and the two inner layer sheets 13 that overlap each other in the first heat seal region HT are further heated by the seal block 720 and the anvil block 750. Sealing is performed to form seal portions S ′ and S ′ in the second heat seal region HT. It is preferable that the seal portions S ′ and S ′ in the first heat seal region HT and the seal portions S ′ and S ′ in the second heat seal region HT have substantially the same size. Thus, the continuous body 100 of the diaper 1 in which the 1st heat seal area | region HT was formed maintains the state hold | maintained on the surrounding surface of the anvil roll 75, and the tension | tensile_strength of the conveyance direction of the continuous body 100 of the diaper 1 Therefore, the first heat seal region HT and the second heat seal region HT can be easily matched, and a sufficient sealing strength by heat sealing can be further easily obtained.

Furthermore, in the first embodiment, as shown in FIG. 4, the diaper 1 continuous body 100 in which the second heat seal region HT is formed is held on the peripheral surface of the anvil roll 75 to hold the elastic members 14, 15, In the state where 16 is extended, the anvil roll 75 is rotated and conveyed between the seal block 730 of the third seal roll 73 and the anvil block 750 of the anvil roll 75. Then, in a state where the elastic members 14, 15, 16 are extended, the two outer layer sheets 12 and the two inner layer sheets 13 that overlap in the second heat seal region HT are further heated by the seal block 730 and the anvil block 750. Sealing is performed to form seal portions S ′ and S ′ in the third heat seal region HT. The sizes of the seal portions S ′ and S ′ in the first heat seal region HT, the seal portions S ′ and S ′ in the second heat seal region HT, and the seal portions S ′ and S ′ in the third heat seal region HT, respectively. It is preferable that the lengths are substantially the same. In this way, the diaper 1 continuous body 100 in which the first heat seal region HT and the second heat seal region HT are formed is maintained on the peripheral surface of the anvil roll 75, and the diaper 1 Since the tension in the transport direction of the continuous body 100 is constant, the first heat seal region HT, the second heat seal region HT, and the third heat seal region HT can be easily matched, and sufficient sealing strength can be obtained by heat sealing. Is more easily obtained. In addition, during the formation of the first to third heat seal regions HT, in the first embodiment, when a lifting tool (not shown) is provided, the tip 750a of the anvil block 750 and the peripheral surface 75a of the anvil roll 75 are It is preferable that there is no step between them and that the surface is flat.

Next, the constituent fibers melted by heat sealing are forcibly cooled, and the heat sealing region HT is cooled in a state where the elastic members 14, 15, 16 are extended (cooling step). In the cooling step, the cooling nozzle 6 that blows cooling air is used to blow air onto the heat seal region HT on the heat seal block arranged on the roll. Cooling in the cooling step is performed so that the seal portions S ′ and S ′ are solidified. Whether the diaper 1 has been solidified by the cooling process can be determined by the fact that the side seal portion S of the diaper 1 is not broken without losing the contraction force of the elastic members 14, 15, 16. This will be specifically described below. As shown in FIG. 4, the anvil roll 75 in a state in which the continuous body 100 of the diaper 1 in which the third seal region is formed is held on the peripheral surface of the anvil roll 75 and the elastic members 14, 15, 16 are extended. Is rotated and conveyed between the cooling nozzle 6 and the anvil block 750 of the anvil roll 75. In the first embodiment, when the lifting tool (not shown) is provided, the anvil roll 75 is rotated and the diaper 1 continuous body 100 is conveyed between the cooling nozzle 6 and the anvil block 750 of the anvil roll 75. Thus, it is preferable to move the tip 750a of the anvil block 750 inward from the peripheral surface 75a of the anvil roll 75 via a lifting tool (not shown).

Formed between the cooling nozzle 6 and the anvil block 750 of the anvil roll 75 by heat sealing between the seal blocks 710, 720, 730 of the seal rolls 71, 72, 73 and the anvil block 750 of the anvil roll 75. In the heat seal region HT, the constituent fibers of the outer layer sheet 12 and the inner layer sheet 13 are melted in a state where the elastic members 14, 15, and 16 are extended. Cooling air is blown from the cooling nozzle 6 to the heat sealing region HT on the anvil block 750 on the constituent fibers thus melted, and the constituent fibers of the melted outer layer sheet 12 and inner layer sheet 13 are forced. To form seal portions S ′ and S ′. As described above, since the continuous body 100 of the diaper 1 is held on the peripheral surface of the anvil roll 75 and the elastic members 14, 15, 16 are in an extended state, the molten constituent fiber is forcibly cooled. By effectively avoiding the elastic members 14, 15, and 16 from contracting, the sealed portions S ′ and S ′ in which the constituent fibers are solidified can be formed in a state where the elastic members 14, 15, and 16 are extended. In particular, in the first embodiment, when the lifting / lowering tool (not shown) is provided, as described above, the tip 750a of the anvil block 750 is located on the inner side from the peripheral surface 75a of the anvil roll 75, and the tip 750a of the anvil block 750 is provided. It is preferable to blow cooling air from the cooling nozzle 6 onto the continuous body 100 of the diaper 1 in a state separated from the diaper 1. When sprayed in this manner, the cooling efficiency of the melted constituent fibers is good, and the sealed portions S ′ and S ′ in which the constituent fibers are solidified can be efficiently formed in a state where the elastic members 14, 15 and 16 are extended. A region ST shown in FIG. 4 indicates a region where cooling air is blown from the cooling nozzle 6. Although the heat seal region HT and the region ST shown in FIG. 4 have the same size, the sizes may be different.

Next, the pants-type disposable diaper 1 having the side seal portion S is formed by separating the seal portions S ′ and S ′ in the heat seal region HT (separation step). The separation process will be specifically described below. As shown in FIG. 4, in a state where the continuous body 100 of the diaper 1 in which the seal portions S ′ and S ′ are formed is held on the peripheral surface of the anvil roll 75, the anvil roll 75 is rotated and the product cut roll 74 is rotated. The cutter blade 740 and the anvil block 750 of the anvil roll 75 are conveyed. In the first embodiment, when the lifting / lowering tool (not shown) is provided, the anvil roll 75 is rotated so that the continuous body 100 of the diaper 1 is formed between the cutter blade 740 of the product cut roll 74 and the anvil block 750 of the anvil roll 75. It is preferable that the anvil block 750 is raised via a lifting / lowering tool (not shown) at the timing of conveyance between the leading end 750a and the flat surface with no step between the peripheral surface 75a of the anvil roll 75. Then, the cutter blade 740 and the anvil block 750 are separated so as to bisect the pair of seal portions S ′ and S ′ at a substantially central position in the transport direction of the heat seal region HT, and have a pair of side seal portions S and S. The pants-type disposable diaper 1 provided with the outer packaging material 11 is continuously formed. Thus, the continuous body 100 of the diaper 1 in which the seal portions S ′ and S ′ are formed is maintained on the peripheral surface of the anvil roll 75, and the tension in the transport direction of the continuous body 100 of the diaper 1 is maintained. Therefore, it is easy to align the cutter blade 740 with the center position in the conveying direction of the pair of seal portions S ′ and S ′, and it is easy to form the side seal portions S and S that are equal to the left and right.

In the manufacturing method of the first embodiment, the sealing step, the cooling step, and the separation step are performed in a state where the tension in the transport direction of the continuous body of the outer packaging material 11 (the continuous body 100 of the diaper 1) is constant, that is, the same anvil roll 75, in a state where the continuous body of the outer packaging material 11 is held. Specifically, a continuous body of the outer packaging material 11 folded in half is introduced onto the anvil roll 75, the constituent fibers of the belt- like sheets 12 and 13 are melted and heat-sealed in the sealing step, and then the anvil roll continuously. After forcibly cooling the constituent fibers melted in the cooling process on 75, the diapers 1 are continuously formed in the separating process on the anvil roll 75 continuously. As described above, the continuous body of the outer packaging material 11 is held on the same anvil roll 75, and the seal blocks 710, 720, 730 of the first, second, and second seal rolls 71, 72, 73 and Seal portions S ′ and S ′ in the first heat seal region HT, seal portions S ′ and S ′ in the second heat seal region HT, and a third heat seal region formed by the anvil block 750 of the anvil roll 75. The seal portions S ′ and S ′ of the HT are easily matched and overlapped. In addition, the air is supplied to the heat seal area HT on the heat seal block in the area ST by the cooling nozzle 6 while the elastic members 14, 15 and 16 are constantly extended while the tension member is conveyed in a constant tension state. The seal portions S ′ and S ′ are formed by spraying and solidifying the melted constituent fibers. As described above, since the solid seal portions S ′ and S ′ are formed in a state where the elastic members 14, 15 and 16 are extended, the seal portions S ′ and S are no longer due to the contraction force of the elastic members 14, 15 and 16. A pants-type disposable diaper 1 having side seal portions S, S that are difficult to deform and have an excellent appearance can be manufactured. The diaper 1 manufactured in this way has sufficient seal strength of the side seal portions S and S, and is excellent in appearance and texture of the side seal portions S and S. In particular, in the first embodiment, since the sealing step, the cooling step, and the separation step are performed on the same roll 75, it is easy to position each processing step. Further, the tension in the conveying direction of the continuous body of the outer packaging material 11 (the continuous body 100 of the diaper 1) can be easily made constant, the seal strength of the side seal portions S and S is sufficient, and the appearance and texture of the side seal portions S and S It is easy to manufacture the pants-type disposable diaper 1 excellent in the above.
In the manufacturing method of the first embodiment, the sealing step, the cooling step, and the separation step are performed in a state where the continuous body of the outer packaging material 11 (the continuous body 100 of the diaper 1) is fixed to the same anvil roll 75. Therefore, since “slip (position misalignment)” between the anvil roll and the material is unlikely to occur, the tension in the transport direction is likely to be constant, and the stretched state of the elastic members 14, 15, 16 is easily maintained. Processing in the region HT can be performed stably. In other words, when forming the seal portions S ′ and S ′, the seal portions S ′ and S ′ are hardly affected by the contraction force of the elastic body and the conveyance tension, and can be held in a stable state until the molten seal interface is solidified. Since the strength of S ′ is stabilized and the molten material can be solidified while being stretched, the texture of the seal portions S ′ and S ′ is improved.

Hereinafter, the manufacturing method of the pants | underpants type wearing article of this invention is demonstrated, referring drawings based on the preferable 2nd embodiment.
The pants-type disposable diaper manufactured by the manufacturing method of the second embodiment is the same as the pants-type disposable diaper 1 manufactured by the manufacturing method of the first embodiment.
FIG. 7 schematically shows a processing apparatus 7B suitably used in the manufacturing method of the second embodiment.
About the processing apparatus 7B used for a 2nd embodiment, a different point from the processing apparatus 7A used for a 1st embodiment is demonstrated. The points that are not particularly described are the same as those of the processing apparatus 7A, and the description of the processing apparatus 7A is appropriately applied. In FIG. 7, the same parts as those in FIG.

As shown in FIG. 7, the processing apparatus 7B is separate from the first to third seal rolls 71, 72, 73 and the anvil roll 75 arranged to face the first to third seal rolls 71, 72, 73. , A pair of metal cooling rolls 61 and 62, and a pair of product cut rolls 74 and a metal flat roll 78.

In the anvil roll 75 provided in the processing apparatus 7B, the anvil block 750 is fixed to the anvil roll 75, and the six anvil blocks 750 attached to the six circumferential positions in the circumferential direction of the roll are respectively the tip 750a. However, as shown in FIG. 7, the anvil roll 75 is arranged flush with the peripheral surface 75a (the flat state with no step between the tip 750a of the anvil block 750 and the peripheral surface 75a of the anvil roll 75). .

The pair of metal cooling rolls 61 and 62 provided in the processing apparatus 7B forcibly cools the constituent fibers in the molten state in the heat seal region HT. Each of the cooling roll 61 and the roll 62 has a width over the entire width of the diaper continuous body 100 folded in two. The surface of the cooling roll 61 is a mirror surface, a dot pattern or the like, and is used properly according to the purpose. The roll 62 may be made of metal or resin as long as the surface layer is surface-treated so that an adhesive such as hot melt used for forming the diaper continuous body 100 does not adhere thereto, and may have a cooling function. . When the surface layer of the roll 62 is a resin, the resin is selected from natural rubber, isoprene rubber, butadiene rubber, styrene / butadiene rubber, ethylene / propylene rubber, nitrile rubber, urethane rubber, silicone rubber, and the like. The hardness is properly used according to the purpose. A clearance adjustment mechanism (not shown) may be attached between the cooling roll 61 and the roll 62 to adjust the nip pressure.

The processing apparatus 7B includes a pair of nip rolls 63 and 63 on the upstream side of the pair of metal cooling rolls 61 and 62, and also includes a pair of nip rolls 64 and 64 on the downstream side. The diaper 1 continuous body 100 can be transported between the cooling roll 61 and the roll 62 while adjusting the tension in the transport direction of the diaper 1 continuous body 100 by the nip rolls 63 and 63 and the nip rolls 64 and 64. it can. The rotation speeds of the cooling roll 61 and the roll 62 and the nip rolls 63 and 64 are controlled by a control means (not shown) provided in the processing apparatus 7B, and are rotationally controlled in the directions indicated by the arrows in FIG. .

The pair of product cut rolls 74 and the metal flat roll 78 provided in the processing apparatus 7B are cut off from the seal portions S ′ and S ′ in the heat seal region HT by the cutter blade 740 of the product cut roll 74 to form a pair of side seals. A pants-type disposable diaper 1 having an outer packaging material 11 having portions S and S is formed.

Next, a method for manufacturing a pants-type disposable diaper using the processing apparatus 7B described above will be described. In the second embodiment, the description in detail regarding the first embodiment is appropriately applied to points that are not particularly described.

First, in the same manner as in the first embodiment, a continuum of wrapping outer packaging material 11 (a continuum 100 of diapers 1) is formed.
Thereafter, as shown in FIG. 7, the diaper 1 continuous body 100 folded in half is introduced onto the anvil roll 75 via the introduction roll 76 using the processing apparatus 7B, and the same as in the first embodiment. The seal portions S ′ and S ′ of the first heat seal region HT are formed by the seal block 710 and the anvil block 750, and the seal portions S ′ and S of the second heat seal region HT are formed by the seal block 720 and the anvil block 750. 'And further, seal portions S' and S 'of the third heat seal region HT are formed by the seal block 730 and the anvil block 750.

Next, in the second embodiment, as shown in FIG. 7, the diaper 1 continuous body 100 in which the seal portions S ′ and S ′ are formed in the heat seal region HT held on the peripheral surface of the anvil roll 75. The pair of nip rolls 63, 63 and the pair of nip rolls 64, 64 nip the continuous body 100 of the diaper 1 while the pair of nip rolls 63, 63 nip the cooling roll 61. Supply between the roll 62.
By supplying between the cooling roll 61 and the roll 62, the constituent fibers of the outer layer sheet 12 and the inner layer sheet 13 melted at the seal portions S ′, S ′ are forcibly cooled, and the elastic members 14, The seal portions S ′ and S ′ are formed by cooling in a state where the 15 and 16 are extended. Note that a region ST shown in FIG. 7 indicates a region cooled by the cooling roll 61 and the roll 62. The heat seal region HT and the region ST shown in FIG. 7 have the same size, but may have different sizes. As described above, since the solid seal portions S ′ and S ′ are formed in a state where the elastic members 14, 15 and 16 are extended, the seal portions S ′ and S are no longer due to the contraction force of the elastic members 14, 15 and 16. A pants-type disposable diaper 1 having side seal portions S, S that are difficult to deform and have an excellent appearance can be manufactured. The tension in the conveyance direction of the continuous body 100 of the diaper 1 when the nip roll 63 and the nip roll 64 are supplied between the cooling roll 61 and the roll 62 may be a tension that can maintain the stretched state of the elastic members 14, 15, and 16. However, it is preferable from the viewpoint of excellent appearance of the formed seal portions S ′ and S ′ as long as the tension is equal to or higher than the tension that is held on the peripheral surface of the anvil roll 75 and extends the elastic members 14, 15, and 16. .

Next, in the second embodiment, as shown in FIG. 7, the diaper 1 continuous body 100 in which the seal portions S ′ and S ′ are formed in the heat seal region HT is provided separately from the anvil roll 75. It is conveyed between the cutter blade 740 of the product cut roll 74 and the flat roll 78. Then, the cutter blade 740 and the flat roll 78 are separated so as to bisect the pair of seal portions S ′ and S ′ at the substantially central position in the transport direction of the heat seal region HT, and have a pair of side seal portions S and S. A pants-type disposable diaper 1 having an outer packaging material 11 is manufactured. The diaper 1 manufactured in this way has sufficient seal strength of the side seal portions S and S, and is excellent in appearance and texture of the side seal portions S and S.

The method for producing the pant-type absorbent article of the present invention is not limited to the first and second embodiments described above, and can be changed as appropriate.

For example, in the pants-type disposable diaper 1 manufactured according to the above-described embodiment, the outer packaging material 11 is bound inwardly in the longitudinal central portion, and spans the ventral side A, the back side B, and the crotch C. The pant-type absorbent article manufactured by the method for manufacturing a pant-type absorbent article according to the present invention is provided on the ventral-side sheet member and the back-side part B arranged on the ventral-side part A. The underpants type disposable diaper which has the division | segmentation outer packaging material divided | segmented into the back | dorsal sheet | seat member distribute | arranged may be sufficient.

As shown in FIG. 8, the manufacturing method of the underpants type disposable diaper which has a division | segmentation outer packaging material WHEREIN: Between the strip | belt-shaped outer layer sheet | seat 12 and the strip | belt-shaped inner layer sheet | seat 13, waist part elastic member 14 and waist part elastic member 15 are provided. A plurality of each are arranged in an extended state extended to a predetermined extension rate. At this time, a hot melt adhesive is applied to a predetermined portion of the waist elastic member 14 and the waistline elastic member 15 via an adhesive coating machine (not shown). In addition, the belt-like outer layer sheet 12 and the belt-like inner layer sheet 13 are heated by an adhesive coating machine (not shown) on either one or both opposing surfaces of the two sheets before they are overlapped. A hot melt adhesive 8 is added intermittently to a region including a region corresponding to the seal region HT and a region corresponding to a region where the absorbent main body 10 is disposed.

Then, as shown in FIG. 8, between the pair of nip rolls 9 and 9, the belt-shaped outer layer sheet 12 and the belt-shaped inner layer sheet 13 in which the waist elastic member 15 and the waist elastic member 15 are sandwiched in an expanded state are fed. By applying pressure, a continuous body is formed in which a plurality of elastic members 14 and 15 are arranged in an extended state between the belt- like sheets 12 and 13. Next, the continuous body is composed of a pressure roll 91 that forms elastic member precut means and a convex portion for cutting the elastic members 14 and 15 and an anvil roll 92 that is disposed opposite to the pressure roll 91. And is partially pressurized and heated to divide the elastic members 14 and 15 where the absorbent main body 3 is disposed into a plurality of pieces so that the contraction function is not expressed. Note that a plurality of convex portions of the pressure roll 91 are partially arranged on the peripheral surface of the roll, corresponding to positions where the elastic members 14 and 15 are divided into a plurality of pieces.

Next, the continuous body in which the elastic members 14 and 15 are divided into a plurality of pieces is divided into a continuous body of two outer packaging materials 11A and 11B by the dividing means 93. The continuous body of the two outer packaging materials 11A and 11B generated by the division is used as an abdominal sheet member and a back sheet member, respectively. In this manner, a continuous body of outer packaging materials 11A and 11B in which a plurality of elastic members 14 and 15 are arranged in an expanded state between the belt- like sheets 12 and 13 is formed (step of forming a continuous body of the outer packaging material 11).
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.

Next, similarly to the embodiment shown in FIG. 6 described above, an adhesive such as a hot melt adhesive is applied in advance to the absorbent main body 10 manufactured in a separate process, rotated 90 degrees, and the continuous body of the outer packaging material 11 It supplies and fixes intermittently on the inner layer sheet | seat 13, and forms the continuous body 100 of the diaper 1 (arrangement process of an absorptive main body). And as shown in FIG. 8, it superimposes so that the both sides of the conveyance direction of each of the continuous body of outer packaging material 11A and the continuous body of outer packaging material 11B may overlap (superposition process). In the overlapping process of this embodiment, after the both sides of each of the continuous body of the outer packaging material 11A and the continuous body of the outer packaging material 11B are overlapped so as to be folded at both ends in the length direction of the absorbent main body 10, The two sides of the continuous body of the outer packaging material 11A and the both side parts of the continuous body of the outer packaging material 11B are overlapped. The width of the belt-like outer layer sheet 12 and the belt-like inner layer sheet 13 are the same, the side of the continuous body of the outer packaging material 11A and the continuous body of the outer packaging material 11B are folded, and both ends in the length direction of the absorbent main body 10 It does not have to be folded on the part.

Thereafter, similarly to the above-described embodiment shown in FIG. 6, the ventral sheet member disposed on the ventral side A and the dorsal seat disposed on the dorsal side B through the sealing process, the cooling process, and the disconnecting process. A pants-type disposable diaper having a divided outer packaging material divided into members is manufactured.

Further, for example, in the first and second embodiments described above, the first heat seal region HT is formed by the seal block 710 and the anvil block 750, and the second heat seal region HT is formed by the seal block 720 and the anvil block 750. Further, the third heat seal region HT is formed by the seal block 730 and the anvil block 750. However, the heat seal region HT may be formed only once, and more heat seal regions may be formed. You may make it form HT.
Further, for example, in the above-described embodiment, two seal rolls are used. However, the present invention is not limited to this, and there may be one or two or more three. When sealing reliably, it is preferable to use a plurality.

Moreover, in the 1st, 2nd embodiment mentioned above, although the underpants type disposable diaper 1 is manufactured, the manufacturing method of the underpants type absorbent article of this invention is not only underpants type disposable diapers but underpants type sanitary. It is also suitable for the production of napkins, pant-type incontinence pads, and other pant-type wearing articles such as sanitary shorts and disposable underwear that do not have an absorbent main body or absorbent core. Moreover, in the embodiment mentioned above, although the outer packaging material 11 is manufacturing the underpants type disposable diaper 1 of the shape which was bound inward in the longitudinal direction center part, the outer packaging material 11 is a wearer's back side and a wearer's side. A pants-type disposable diaper separated from the ventral side may be used.

In connection with the above-described embodiment, the following method for manufacturing a pants-type wearing article is disclosed.

<1>
A pant-type wearing article manufacturing method for continuously producing a pants-type wearing article provided with an outer packaging material having a pair of side seal parts,
After superposing the continuum of the outer packaging material in which a plurality of elastic members are arranged in an extended state between the belt-like sheets so that both side portions in the transport direction of the continuum of the outer packaging material overlap,
In the state where the elastic member is stretched at a predetermined interval in the conveying direction, the continuous body of the outer packaging material that has been superposed is melted and heat-sealed to melt the constituent fibers of the belt-like sheet of the outer packaging material, and a heat seal region A sealing step for forming a sealing portion on
A cooling step of forcibly cooling the constituent fibers melted by heat sealing and cooling the heat sealing region in a state in which the elastic member is stretched;
The manufacturing method of the underpants type wearing article provided with the separation process of separating the seal part in the heat seal field, and forming the underpants type wearing article which has the side seal part.

<2>
The method for manufacturing a pants-type wearing article according to <1>, wherein the sealing step, the cooling step, and the separating step are performed in a state in which a tension in a transport direction of the continuous body of the outer packaging material is constant.
<3>
The said sealing process, the said cooling process, and the said cutting-off process are the manufacturing methods of the underpants type wearing article as described in said <2> performed on the same roll.
<4>
After introducing the continuous body of the wrapped outer packaging material on the anvil roll, melting the constituent fibers of the belt-like sheet in the sealing step and heat-sealing, continuously in the cooling step on the anvil roll After forcibly cooling the constituent fibers that have been melted, the pants-type wearing article is formed on the anvil roll in the detaching step in a continuous manner, according to any one of <1> to <3>. Manufacturing method of pants-type wearing articles.
<5>
The cooling process is performed by using a cooling nozzle that blows cooling air, and blows air onto the heat seal area on the heat seal block arranged on the roll. Article manufacturing method.
<6>
<5> in which cooling air is blown from the cooling nozzle to the continuous body of the outer packaging material in a state where the front end of the heat seal block is located on the inner side from the peripheral surface of the roll and separated from the front end of the heat seal block. > The manufacturing method of the underpants type wearing article as described in>.
<7>
The method for manufacturing a pants-type wearing article according to any one of <1> to <6>, wherein the cooling in the cooling step is performed so that the seal portion is in a solidified state.
<8>
The sealing step, the cooling step, and the separation step include a seal roll, a cooling nozzle and a product cut roll, and these rolls and an anvil roll disposed to face the cooling nozzle, and seal the peripheral surface of the anvil roll. The method for producing a pants-type wearing article according to any one of <1> to <7>, wherein a processing apparatus in which a roll, a cooling nozzle, and a product cut roll are sequentially arranged is used.
<9>
The method for producing a pants-type wearing article according to <8>, wherein a plurality of the seal rolls are used.
<10>
<8> or <9>, wherein a seal block is attached to each of the seal rolls, and two convex portions are formed at the end of the seal block along the axial length direction of the seal roll. The manufacturing method of the underpants type wearing article as described in 2.

<11>
The cooling nozzle is arranged to face the peripheral surface of the anvil roll, and the cooling nozzle injects cooling air over a width wider than the width of the heat seal area formed in the continuous body of the outer packaging material. The method for producing a pants-type wearing article according to any one of the above items <8> to <10>, which has a structure capable of being formed.
<12>
The method for producing a pants-type wearing article according to <11>, wherein the temperature of the cooling air is lower than the melting point and the softening point of the constituent fibers of the belt-like sheet.
<13>
The method for producing a pants-type wearing article according to <12>, wherein the cooling air is 26 ° C. or lower and 0 ° C. or higher.
<14>
The anvil roll is provided with a plurality of suction holes for adsorbing the continuum of the outer packaging material on its peripheral surface or a holder for holding the continuum of the outer packaging material on the peripheral surface of the anvil roll. The method for producing a pants-type wearing article according to any one of> to <13>.
<15>
<14> description in which the continuum of the outer packaging material introduced onto the anvil roll is held on the peripheral surface of the anvil roll by the suction hole and / or the holder on the peripheral surface of the anvil roll. Manufacturing method of pants-type wearing articles.
<16>
The method for producing a pants-type wearing article according to any one of <8> to <15>, wherein an anvil block is attached to the anvil roll.
<17>
The tip of the anvil block is flat with no step between the peripheral surface of the anvil roll, or the pants-type wearing according to <16>, which is arranged inward from the peripheral surface of the anvil roll Article manufacturing method.
<18>
The method for producing a pants-type wearing article according to <16> or <17>, wherein the anvil block can be moved up and down from the circumferential surface of the anvil roll or from the inside to the circumferential surface.
<19>
<16> in which cooling air is blown from the cooling nozzle to the continuous body of the outer packaging material in which the tip of the anvil block is located on the inner side from the peripheral surface of the anvil roll and is separated from the tip of the anvil block A method for producing a pants-type wearing article according to any one of to <18>.
<20>
Two convex portions arranged at the tip of the seal block of the seal roll and the anvil block of the anvil roll, and the cutter blade of the product cut roll and the anvil block of the anvil roll, with the rotation of each roll, The method for producing a pants-type wearing article according to any one of <8> to <19>, wherein the articles are periodically opposed to each other.
<21>
A plurality of the sealing rolls, a convex portion of the first sealing roll and a region where the sealing region is formed by heat sealing by the anvil block of the anvil roll, A heat seal is applied to the seal region by the anvil block of the anvil roll, and further, a heat seal is applied to the seal region by the convex portion of the third seal roll and the anvil block of the anvil roll. The method for producing a pants-type wearing article according to any one of the above items <8> to <20>.

<22>
In the processing apparatus, when the anvil block of the anvil roll faces the seal block of the seal roll and the cutter blade of the product cut roll, there is a step between the tip of the anvil block and the peripheral surface of the anvil roll. The anvil block of the anvil roll is controlled around the anvil roll at a timing when the cooling nozzle is controlled to be in a flat state and the cooling air is sprayed to the heat seal region of the continuum of the outer packaging material. The method for producing a pants-type wearing article according to any one of <8> to <21>, wherein the article is controlled to move inward from the surface.
<23>
The processing apparatus includes a product reversing machine on the peripheral surface of the anvil roll and after the product cut roll, and the product reversing machine individually applies the pants-type wearing articles cut by the cutter blade of the product cut roll. The method for producing a pants-type wearing article according to any one of the above <8> to <22>, wherein a plurality of suction heads for suction are provided on a peripheral surface thereof.
<24>
The processing apparatus includes a pair of metal cooling rolls and rolls, a pair of product cut rolls and metal flat rolls, separately from the seal rolls and the anvil rolls arranged to face the seal rolls. The method for producing a pants-type wearing article according to any one of <8> to <23>.
<25>
<1 including the disposing step of the absorbent main body for intermittently supplying and fixing the absorbent main body manufactured in a separate process on the inner layer sheet of the outer wrapping material continuous body to form a continuous body of the worn article The method for producing a pants-type wearing article according to any one of> to <24>.
<26>
Constituent fiber melted in the cooling step on the anvil roll after the continuum of the outer packaging material is introduced onto the anvil roll and the constituent fibers of the belt-like sheet are melted and heat-sealed in the sealing step. The pants-type wear according to any one of the above <8> to <25>, wherein the pants-type wear article is continuously formed in the separation step on the anvil roll continuously after forcibly cooling Article manufacturing method.
<27>
The pair of metal cooling rolls and the pant type according to any one of the above <24> to <26>, wherein a pair of nip rolls is provided on the upstream side of the roll and a pair of nip rolls is provided on the downstream side. A method for manufacturing a worn article.
<28>
The pants-type wearing article is a pants-type disposable diaper and has an absorbent core having a liquid permeability, a liquid-impermeable or water-repellent back sheet, and a liquid-retaining absorbent core interposed between the two sheets. The pants-type wearing article according to any one of the above items <1> to <27>, comprising an absorbent main body and the outer packaging material disposed on the back sheet side of the absorbent main body and fixing the absorbent main body Manufacturing method.
<29>
Any of <1> to <28>, wherein the sheet material of the belt-like sheet is a non-woven fabric, and is a single-layer sheet or a laminated sheet composed of an air-through non-woven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, or a meltblown nonwoven fabric. A method for producing a pants-type wearing article according to claim 1.
<30>
Prior to superimposing them on the belt-like sheet, the hot melt adhesive is applied to one or both opposing surfaces of the two sheets by an adhesive application machine <1> to <29> The manufacturing method of the underpants type wearing article of any one of 29.

<31>
The elastic member is any one of the above items <1> to <30>, wherein a stretchable material of natural rubber, polyurethane resin, or urethane foam resin is formed into a thread shape (thread rubber) or a band shape (flat rubber). The manufacturing method of the underpants type wearing article of description.
<32>
The method for manufacturing a pant-type wearing article according to any one of <1> to <31>, wherein the elastic member is a waist elastic member, a waistline elastic member, or a leg elastic member.
<33>
Production of a pants-type wearing article according to the above <32>, wherein a hot-melt adhesive is applied continuously or intermittently to the waist elastic member and the waistline elastic member via an adhesive coating machine. Method.
<34>
The leg-shaped elastic member according to the above <32> or <33>, wherein the leg elastic member is disposed while forming a predetermined leg periphery pattern via a swinging guide that reciprocates perpendicular to the sheet flow direction. A method for manufacturing a worn article.
<35>
The underpants according to any one of <1> to <34>, wherein the side seal portion of the underpants-type wearing article is in a state in which the elastic member is solidified in an extended state and does not exhibit contractility. A method for manufacturing a mold wearing article.
<36>
The method for producing a pant-type wearing article according to any one of the above items <1> to <35>, wherein the side seal portion of the pant-type wearing article is not contracted and has a substantially constant width.
<37>
The method for manufacturing a pants-type wearing article according to any one of <1> to <36>, wherein the continuous body of the outer packaging material is overlapped with the continuous body of the outer packaging material and the absorbent main body in two.
<38>
The continuous body of the outer packaging material is overlapped by folding the absorbent main body in two so that both sides of the continuous body of the outer packaging material serving as the abdominal sheet member and both sides of the continuous body of the outer packaging material serving as the back sheet member are superimposed. The method for producing a pants-type wearing article according to any one of <1> to <36>.

According to the method for producing a pants-type wearing article of the present invention, while obtaining sufficient sealing strength by heat sealing, it effectively avoids shrinkage of the elastic member in the heat-sealed region, and the appearance and texture. It is possible to manufacture a pants-type wearing article having a side seal portion that is excellent.

Claims (15)

1. A pant-type wearing article manufacturing method for continuously producing a pants-type wearing article provided with an outer packaging material having a pair of side seal parts,
   After superposing the continuum of the outer packaging material in which a plurality of elastic members are arranged in an extended state between the belt-like sheets so that both side portions in the transport direction of the continuum of the outer packaging material overlap,
   In the state where the elastic member is stretched at a predetermined interval in the conveying direction, the continuous body of the outer packaging material that has been superposed is melted and heat-sealed to melt the constituent fibers of the belt-like sheet of the outer packaging material, and a heat seal region A sealing step for forming a sealing portion on
   A cooling step of forcibly cooling the constituent fibers melted by heat sealing and cooling the heat sealing region in a state in which the elastic member is stretched;
   The manufacturing method of the underpants type wearing article provided with the separation process of separating the seal part in the heat seal field, and forming the underpants type wearing article which has the side seal part.
2. The method for manufacturing a pants-type wearing article according to claim 1, wherein the sealing step, the cooling step, and the separating step are performed in a state in which a tension in a conveying direction of the continuous body of the outer packaging material is constant.
3. The method for producing a pants-type wearing article according to claim 2, wherein the sealing step, the cooling step, and the separating step are performed on the same roll.
4. After introducing the continuous body of the wrapped outer packaging material on the anvil roll, melting the constituent fibers of the belt-like sheet in the sealing step and heat-sealing, continuously in the cooling step on the anvil roll The pant mold according to any one of claims 1 to 3, wherein after the molten constituent fiber is forcibly cooled, the pant mold wearing article is further continuously formed on the anvil roll in the separation step. A method for manufacturing a worn article.
5. The said cooling process manufactures the pants | underpants type wearing article of Claim 3 or 4 which blows air to the said heat seal area | region on the heat seal block distribute | arranged to the said roll using the cooling nozzle which blows the air for cooling. Method.
6. 6. A cooling air is blown from the cooling nozzle to a continuous body of the outer packaging material in a state in which the front end of the heat seal block is located on the inner side from the peripheral surface of the roll and is separated from the front end of the heat seal block. The manufacturing method of the underpants type wearing article as described in 2.
7. The sealing step, the cooling step, and the separation step include a seal roll, a cooling nozzle and a product cut roll, and these rolls and an anvil roll disposed to face the cooling nozzle, and seal the peripheral surface of the anvil roll. The method for producing a pants-type wearing article according to any one of claims 1 to 6, wherein a processing apparatus in which a roll, a cooling nozzle, and a product cut roll are sequentially arranged is used.
8. The cooling nozzle is disposed so as to face the peripheral surface of the anvil roll, and the cooling nozzle supplies cooling air over a width wider than the width of the heat seal region formed in the continuous body of the outer packaging material. The manufacturing method of the underpants type wearing article of Claim 7 which has a structure which can be injected.
9. The method for producing a pants-type wearing article according to claim 8, wherein the temperature of the cooling air is lower than the melting point and the softening point of the constituent fibers of the belt-like sheet.
10. The anvil roll is provided with a plurality of suction holes for adsorbing the continuum of the outer packaging material on its peripheral surface or a holder for holding the continuum of the outer packaging material on the peripheral surface of the anvil roll,
    The continuous body of the outer packaging material introduced onto the anvil roll is held on the peripheral surface of the anvil roll by the suction hole and / or the holding tool on the peripheral surface of the anvil roll. The manufacturing method of the underpants type wearing article of any one of these.
11. An anvil block is attached to the anvil roll,
    11. The tip of the anvil block is flat with no step between the peripheral surface of the anvil roll, or is disposed on the inner side from the peripheral surface of the anvil roll. The manufacturing method of the underpants type wearing article as described in 2.
12. The cooling air is blown from the cooling nozzle to the continuous body of the outer packaging material in which the tip of the anvil block is located on the inner side from the peripheral surface of the anvil roll and is separated from the tip of the anvil block. The manufacturing method of the underpants type wearing article of description.
13. The processing apparatus includes a pair of metal cooling rolls and rolls, a pair of product cut rolls and metal flat rolls, separately from the seal rolls and the anvil rolls arranged to face the seal rolls. The method for producing a pants-type wearing article according to any one of claims 7 to 12.
14. The manufacturing method of the underpants type wearing article of Claim 13 provided with a pair of nip rolls in the upstream of a pair of said metal cooling rolls and the said roll, and also provided in a downstream the pair of nip rolls.
15. The pant mold according to any one of claims 1 to 14, wherein the side seal portion of the pant wear article is in a state where the elastic member is solidified in a stretched state and does not exhibit contractility. A method for manufacturing a worn article.

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