JP4916303B2 - Method for manufacturing worn article - Google Patents

Description

  The present invention relates to a method for manufacturing a worn article.

Conventionally, an outer packaging material and an absorbent main body fixed to the outer packaging material are provided, and both sides of a portion arranged on the abdomen side during wearing and both sides of a portion arranged on the back side of the outer packaging material are heated. A pants-type disposable diaper in which a waist opening and a pair of leg openings are formed by bonding with a seal or the like is known.
Moreover, as a pants-type disposable diaper, in addition to the peripheral edge of the waist opening and the peripheral edge of the leg opening, an elastic member is also provided on the waist part positioned below the peripheral edge of the waist opening, thereby elastic elasticity The thing which gave is known.
When elastic elasticity is imparted to the waist part of a disposable diaper, a stretched thread-like or belt-like elastic member is fixed with an adhesive between two substantially non-stretchable sheets, and the elastic member A method of forming the gathers by shrinking is generally used. For example, in Patent Document 1, an elastic member for forming a waistline gather is fixed between two continuously conveyed sheets in an expanded state, and an outer packaging material continuous body having elasticity in a machine direction is manufactured. A method of manufacturing a pants-type diaper is described in which an absorbent main body is intermittently fixed to a continuous outer packaging material, and then cut and sealed at a predetermined location.

JP-A-6-296638

  By the way, the elastic sheet obtained by the method which does not form a gather is known as a material used for clothes. However, using such a sheet, particularly a belt-like stretchable sheet having excellent stretchability in the longitudinal direction, a so-called transverse flow method (diapers are arranged through a diaper continuous body in which the diaper is continuous in the width direction of the diaper). When manufacturing disposable diapers with a manufacturing method), if the sheet is stretched with another sheet and heat-sealed or ultrasonically sealed, defects such as holes or cuts will occur in the sheet. There was a problem that was likely to occur. Such a problem is likely to occur even in other cases where the stretchable sheet in an extended state is overlapped with another sheet and these sheets are subjected to processing involving pressurization.

  Accordingly, an object of the present invention is to provide a method for manufacturing a worn article that can effectively prevent a hole or a cut from occurring in a pressurized portion and / or the vicinity thereof, and can produce a good-quality worn article with a high yield. It is to provide.

  The present invention provides a method for manufacturing a worn article comprising a step of partially applying pressure processing to a laminate in which a stretchable first sheet and a second sheet are laminated. After the hot melt type adhesive is arranged between the sheets so that a part of the hot melt type adhesive extends from the pressurized portion of both sheets in the same direction as the extension direction of the first sheet. The object is achieved by providing a method for manufacturing a worn article, in which the pressing process is performed on the pressed part.

  According to the method for manufacturing a worn article of the present invention, it is possible to effectively prevent a hole or a cut from occurring in a pressurized portion and / or the vicinity thereof, and a high-quality worn article can be manufactured with a high yield.

The present invention will be described below based on preferred embodiments with reference to the drawings.
First, the wearing article manufactured by the manufacturing method of this embodiment is demonstrated.
The manufacturing method of this embodiment manufactures a pants-type disposable diaper as a pants-type wearing article. The perspective view of the underpants type disposable diaper manufactured by the manufacturing method of this embodiment is shown by FIG. FIG. 2 shows a plan view of the developed state of the diaper of FIG. FIG. 3 shows a cross-sectional view taken along line II-II in FIG.

  The pants-type disposable diaper 1 shown in FIGS. 1 to 3 includes a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3, and a liquid-retaining absorption disposed between both sheets 2 and 3. A substantially vertically long absorbent main body 10 having an absorbent core 4 and an outer packaging material 11 arranged on the back sheet 3 side of the absorbent main body 10 and fixing the absorbent main body 10.

  The outer packaging material 11 has an hourglass shape in which both side edges are bound inward in the central portion in the longitudinal direction, and defines the outline of the diaper. The diaper 1 is divided in the longitudinal direction in the unfolded state into an abdominal side A disposed on the wearer's abdomen, a back side B disposed on the dorsal side, and a crotch C positioned therebetween. In the outer packaging material 11, both side portions A1 and A2 on the ventral side portion A and both side portions B1 and B2 on the back side portion B are joined to each other, and the pair of side seal portions S and S is attached to the diaper 1 by the joining. A waist opening 5 and a pair of leg openings 6 and 6 are formed.

  The top sheet 2, the back sheet 3, and the absorbent core 4 each have a rectangular shape, and are integrated to form a vertically long absorbent body 10. 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 absorptive core 4, what is comprised from the particle | grains and fiber material of a superabsorbent polymer, and is coat | covered with the tissue paper (not shown) etc. can be used. Side cuffs 8 and 8 are formed on the left and right sides of the absorbent body 10 in the longitudinal direction, and the side cuff elastic members 81 are fixed in the stretched state near the free ends of the side cuffs 8 and 8, respectively. Has been.

  As shown in FIG. 3, the outer packaging material 11 includes an outer layer sheet 12 and an inner layer sheet 13 that are stretchable at least in the diaper width direction (left and right direction in FIGS. 2 and 3). The outer layer sheet 12 and the inner layer sheet 13 are laminated. The term “stack” is used regardless of whether or not there is a joint between the two. 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. The outer layer sheet 12 has extended portions 12a and 12b folded back to the inner surface side of the diaper 1 at the opening peripheral edges 5a and 5b of the waist opening, and the folded extended portions 12a and 12b of the outer layer sheet 12 are arranged. Both end portions of the absorbent main body 11 are sandwiched and fixed between 12 b and the inner layer sheet 13.

 As the elastic sheet constituting the outer layer sheet 12, various sheets having elasticity in at least one direction can be used. For example, (1) an extensible fiber layer is integrated on both sides or one side of the elastic fiber layer. (2) A sheet in which stretchable fiber layers are integrated on both sides or one side of a net-like elastic sheet, (3) Stretchable on both sides or one side of an elastic sheet made of an elastic film A sheet in which a fiber layer is integrated, (4) a sheet formed by stretching a nonwoven fabric formed by mixing elastic fibers and non-elastic fibers, and expressing or improving stretchability can be preferably used. . In addition, as an integration method of the elastic fiber layer and the extensible fiber layer, these are laminated and hydroentangled, or the fiber is entangled by air-through, etc., heat embossing, adhesive, ultrasonic, etc. The method of joining is mentioned.

  As the sheet of (1), for example, (a) a substantially inelastic non-elastic fiber layer is disposed on at least one surface of the elastic fiber layer, and both fiber layers have a fiber form of the constituent fibers of the elastic fiber layer. In a state where the fibers are joined together by thermal fusion at the fiber intersections, a part of the constituent fibers of the inelastic fiber layer has entered the elastic fiber layer and / or a part of the constituent fibers of the elastic fiber layer Stretchable non-woven fabric in a state where is embedded in the non-elastic fiber layer. Moreover, as said (1)-(3) sheet | seat, it has (b) the elastic layer which has elastic elasticity, and a substantially inelastic nonelastic fiber layer, and both the said layers are laminated | stacked on the thickness direction. A stretchable sheet or the like obtained by stretching a laminated sheet that is partially bonded to each other can be preferably used.

The stretchable nonwoven fabric (a) will be described.
At the interface between the elastic fiber layer and the non-elastic fiber layer and in the vicinity thereof, the intersection of the constituent fiber of the elastic fiber layer and the constituent fiber of the non-elastic fiber layer is heat-sealed, and is substantially uniform over the entire surface. It is joined to. By joining all over, it is prevented that both layers are separated and a space is formed, and a stretchable nonwoven fabric having a multi-layer structure with a sense of unity, such as a single nonwoven fabric. "The state in which the constituent fibers of the elastic fiber layer maintain the fiber form" means that even if most of the constituent fibers of the elastic fiber layer are given heat, pressure, etc., a film or film-fiber structure The state which is not deformed. Further, in the elastic fiber layer, the intersections of the constituent fibers are thermally fused in the layer. Similarly, in the non-elastic fiber layer, the intersection of the constituent fibers is thermally fused in the layer.

  When non-elastic fiber layers are arranged on both sides of the elastic fiber layer, at least one of the constituent fibers is in a state in which a part of the constituent fibers enters the elastic fiber layer and / or the constituent fibers of the elastic fiber layer A part has entered into at least one of the inelastic fiber layers. In order to allow the constituent fibers of the non-elastic fiber layer to enter the elastic fiber layer and / or to allow the constituent fibers of the elastic fiber layer to enter the non-elastic fiber layer, the constituent fibers of the non-elastic fiber layer and the non-elastic fiber layer It is preferable that at least one of the non-elastic fiber and the elastic fiber is in a web state (a state where the fiber is not heat-sealed) before the process of thermally fusing the constituent fibers. From the viewpoint of allowing the constituent fibers to enter other layers, the fiber layer in the web state is preferable because the short fibers have a higher degree of freedom than the long fibers. Moreover, it is preferable to use the air-through method in order to allow the constituent fibers of the non-elastic fiber layer to enter the elastic fiber layer and / or to allow the constituent fibers of the elastic fiber layer to enter the non-elastic fiber layer. By using the air-through method, the constituent fibers can be made to enter the opposing fiber layer, and the constituent fibers can be easily made to enter from the opposing fiber layer. In addition, by using the air-through method, it becomes easy to allow the constituent fibers of the inelastic fiber layer to enter the elastic fiber layer while maintaining the bulkiness of the inelastic fiber layer. In particular, when the constituent fibers of the inelastic fiber layer are entangled with the constituent fibers of the elastic fiber layer, it is preferable that they are entangled only by the air-through method. In order to entangle the fibers by the air-through method, the gas blowing pressure, the blowing speed, the basis weight and thickness of the fiber layer, the conveyance speed of the fiber layer, etc. may be adjusted appropriately. It is preferable to carry out the method. In the hot air treatment (particularly, the air-through method), a part of the constituent fibers of the non-elastic fiber web enters the elastic fiber web, and at the same time, the constituent fibers of the non-elastic fiber web and / or the constituent fibers of the non-elastic fiber web; The constituent fibers of the elastic fiber web are heat-sealed at their intersections. In this case, care should be taken so that the constituent fibers of the elastic fiber web do not become a film or a film-fiber structure by hot air treatment.

  The elastic fiber layer has the property of being stretchable and contracting when released from the stretched force. The elastic fiber layer preferably has a residual strain of 20% or less, particularly 10% or less when contracted after 100% elongation in at least one direction parallel to the surface. This value is preferably satisfied in at least one of the MD direction and the CD direction, and more preferably satisfied in both directions.

  The elastic fiber layer is an aggregate of fibers having elasticity. The elastic fiber forming method includes, for example, a melt blown method in which a molten resin is extruded from a nozzle hole, and the extruded molten resin is elongated by hot air to thin the fiber, and a semi-molten resin is cooled by cold air. There is a spunbond method in which stretching is performed by a mechanical draw ratio. As a special method of the melt blown method, there is a spinning blow method in which the spun bond method is combined with the melt blown method. The elastic fiber layer may be in the form of a web or a nonwoven fabric made of elastic fibers. For example, it may be a web or a non-woven fabric formed by a spinning blow method, a spun bond method, a melt blow method, or the like. Particularly preferred is a web obtained by the spinning blow method. As the constituent fiber of the elastic fiber layer, for example, a fiber made of thermoplastic elastomer, rubber or the like can be used. In particular, fibers made from thermoplastic elastomers can be melt-spun using an extruder in the same way as ordinary thermoplastic resins, and the fibers thus obtained are easily heat-sealed. Is suitable for the stretchable nonwoven fabric of this embodiment. Examples of the thermoplastic elastomer include styrene elastomers such as SBS, SIS, SEBS, and SEPS, olefin elastomers, polyester elastomers, and polyurethane elastomers. These can be used individually by 1 type or in combination of 2 or more types.

  The inelastic fiber layer has extensibility but is substantially inelastic. The stretchability here refers to the case where the constituent fibers themselves are stretched, and even if the constituent fibers themselves are not stretched, the two fibers that have been heat-sealed at the intersection of the fibers are separated from each other, or the fibers are thermally fused. The three-dimensional structure formed by a plurality of fibers may be structurally changed due to wearing or the like, and the constituent fibers may be broken, and the whole fiber layer may be elongated. Examples of the fibers constituting the inelastic fiber layer include fibers made of polyethylene (PE), polypropylene (PP), polyester (PET or PBT), polyamide, and the like. The fibers constituting the inelastic fiber layer may be short fibers or long fibers, and may be hydrophilic or water repellent. Further, core-sheath type or side-by-side composite fibers, split fibers, irregularly shaped cross-section fibers, crimped fibers, heat-shrinkable fibers, and the like can also be used. These fibers can be used singly or in combination of two or more. The inelastic fiber layer can be a continuous filament or short fiber web or nonwoven.

The stretchable sheet (b) will be described.
An elastic sheet is a laminated sheet in which substantially non-elastic non-elastic fiber layers are laminated on both sides or one side of an elastic layer having elastic elasticity, and these are partly joined in a regular pattern. It can be obtained by subjecting it to stretching.

  For example, the laminated sheet used for the production of the stretchable sheet forms an elastic layer by supplying elastic fibers on a fiber web (first inelastic fiber layer) supplied from a card machine, and further on the elastic layer. , Supply other card machine or fiber web (second non-elastic fiber layer), and apply the hot air treatment to the resulting laminated sheet of the three-layer structure with an air-through dryer, and laminate after the hot air treatment The sheet is subjected to thermal embossing by an embossing device including an embossing roll in which embossing convex portions are regularly arranged on the peripheral surface and an anvil roll arranged to face the embossing roll. The hot air treatment by the dryer is performed for the purpose of heat fusion between the elastic fiber and the non-elastic fiber and the entry of the fiber, but such hot air treatment can be omitted.

  The elastic layer preferably includes elastic fibers made of an elastic material. Examples of the elastic material include a thermoplastic elastomer, rubber, ethylene / propylene copolymer, and the like. Among these, a thermoplastic elastomer is preferable because a fibrous elastic body can be formed relatively easily. Examples of the thermoplastic elastomer include polyurethane, styrene (SBS, SIS, SEBS, SEPS, etc.), olefin (copolymers such as ethylene, propylene, butene, etc.), vinyl chloride, and polyester. These can be used individually by 1 type or in combination of 2 or more types. The content of elastic fibers made of an elastic material in the elastic layer is preferably 50 to 100% by weight, particularly 75 to 100% by weight. As an elastic layer, it can replace with what consists of a fiber layer, and a film-like thing, a net-like thing, etc. can also be used. As the film or net forming material, the above-mentioned various elastic materials can be used.

  The inelastic fiber layer is extensible but substantially inelastic. The stretchability here refers to the case where the constituent fibers themselves are stretched, and even if the constituent fibers themselves are not stretched, the two fibers that have been heat-sealed at the intersection of the fibers are separated from each other, or the fibers are thermally fused. Any of the cases where the three-dimensional structure formed by a plurality of fibers is structurally changed by wearing or the constituent fibers are broken and stretched as a fiber layer. Examples of fibers constituting the inelastic fiber layer include polyolefin resins such as polyethylene and polypropylene, polyamides such as polyester (PET and PBT) and nylon, and fibers made of biodegradable resin such as polylactic acid. The fibers constituting the inelastic fiber layer may be short fibers or long fibers, and may be hydrophilic or water repellent. Moreover, a core-sheath type composite fiber, a split fiber, a modified cross-section fiber, a crimped fiber, a heat-shrinkable fiber, or the like can be used. These fibers can be used singly or in combination of two or more.

  As the elastic fiber used for the sheet of (4), the same elastic fiber as described above can be used as the constituent fiber of the elastic fiber layer of the stretchable nonwoven fabric of (a), and the sheet of (4) can be used. As the non-elastic fiber to be used, the same non-elastic fiber as described above can be used as the constituent fiber of the non-elastic fiber layer of the stretchable nonwoven fabric of (a). As a nonwoven fabric formed by mixing elastic fibers and non-elastic fibers, for example, a fiber web in which both fibers are in a mixed state is formed by a card machine, and hot air treatment or hydroentanglement treatment by an air-through method is performed on the fiber web. Or what was given the nonwoven fabric by giving a partial embossing etc. is mentioned. The stretching process for expressing stretchability (including improvement) includes, for example, two concavo-convex rolls alternately having protrusions extending in the axial length direction and grooves between the protrusions in the circumferential direction. It can be carried out by combining the grooves of the other concavo-convex roll into the groove and introducing a nonwoven fabric between these two rolls. The stretching process using such a concavo-convex roll can also be used for the stretching process of the elastic sheet (b) described above.

  As a stretchable sheet, a nonwoven fabric made of a mixed fiber containing fibers made of a thermoplastic polyurethane elastomer described in JP-A-2004-244791, an extensible composite nonwoven fabric described in JP-A-9-512313, A sheet described as a “stretchable sanitary article surface sheet” in JP-A-3-269145, an elastic-elastic composite sheet described in JP2001-18315, and an elastic composite nonwoven fabric described in JP2001-140158 Also, a composite elastic nonwoven fabric described in JP-A-9-500936, a laminated sheet described in JP-A-10-29259, and the like can be used.

  The sheet constituting the inner layer sheet 13 is preferably made of a nonwoven fabric containing fibers made of a thermoplastic resin from the viewpoint of forming the side seal portions S, S by heat embossing or ultrasonic embossing. As the fiber made of a thermoplastic resin, the same fiber as that constituting the inelastic fiber layer can be used. Examples of the nonwoven fabric used as the sheet constituting the inner layer sheet 13 include an air-through nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, an airlaid nonwoven fabric, and a melt blown nonwoven fabric. Two or more kinds of these laminates can also be used.

In the diaper 1 of the present embodiment, the side seal portion S of the outer packaging material 11 is a portion of the outer layer sheet 12 and the inner layer sheet 13 disposed on the ventral side portion A, and a portion of the inner layer sheet 13 disposed on the back side portion B. And the outer layer sheet | seat 12 is integrated in the state laminated | stacked in this order. These sheets in the side seal portion S are integrated by heat sealing or ultrasonic sealing.

As shown in FIG. 5 and FIG. 6, the side seal portion S in the diaper 1 of the present embodiment is configured such that the above-described four sheets 12, 12, 13, 13 are arranged between a pair of seal members 71, 72 in the heat seal device. As shown in FIG. 6, a portion 73 that is strongly pressed and heated between a pair of seal members 71 and 72 and a relatively weakly pressed and heated portion are formed. The formed portions 74 are alternately formed in the longitudinal direction of the side seal portion S.
5 and 6 show a state in which two adjacent diapers are connected to each other outside the side seal portions S in the manufacturing process of the diaper 1. In the state completed as the diaper 1, it is cut | disconnected in the center between adjacent side seal parts S and S. FIG.

4 and 5 between the outer layer sheet 12 and the inner layer sheet 13 on the ventral side A forming the side seal portion S and between the outer layer sheet 12 and the inner layer sheet 13 on the back side B side. As shown, a hot melt adhesive 75 is provided. The outer layer sheet 12 and the inner layer sheet 13 are joined together by the effect of heat fusion by the sealing process described above and the effect of adhesion by a hot melt adhesive. As shown in FIG. 4, the hot-melt adhesive 75 is applied to a width wider than the side seal portion S. Further, the hot-melt adhesive 75 is applied so as to extend over the entire length in the longitudinal direction (vertical direction in FIG. 2) of the side seal portion S.
The hot-melt adhesive has a portion 75a extending from the side seal portion S toward the inside of the diaper in the diaper width direction (the direction corresponding to the extending direction of the first sheet). The hot-melt adhesive in the diaper 1 has a portion 75b extending from the side seal portion S to the diaper outward side, but the portion 75b may be omitted.

  There is no restriction | limiting in particular in the kind of adhesive agent used in this embodiment, The thing similar to what was conventionally used in the said technical field can be used, and styrene butadiene rubber, styrene butadiene styrene is used as an adhesive agent. Hot-melt adhesives using base polymers such as block copolymers, styrene / isoprene / styrene block copolymers, styrene / ethylene / butylene / styrene block copolymers, and styrene / ethylene / propylene / styrene block copolymers It is preferable to use an agent.

  In the diaper 1 according to the present embodiment, as shown in FIG. 3, the outer layer sheet 12 and the inner layer sheet 13 are joined to each other by heat sealing or ultrasonic sealing in the side seal portion S. Adhesive such as hot melt adhesive at the peripheral edge 50 of the waist opening 5, the peripheral edge 60 of each of the pair of leg openings 6, and the central part in the diaper width direction from the abdominal side A to the back side B 14 and so on. A plurality of waist elastic members 51, 51 are disposed along the peripheral edge of the waist opening at the peripheral edge 50 of the waist opening, and the peripheral edges 60, 60 of the pair of leg openings are also provided. The leg elastic members 61a and 61b are arranged along the peripheral edge of each opening. As elastic members for the waist and legs, elastic materials such as natural rubber, polyurethane resin, foamed urethane resin, and hot melt elastic members are formed into a thread (thread rubber) or a belt (flat rubber). What has been used is preferably used.

Next, a preferred method for continuously producing the above-described pants-type disposable diaper 1 will be described with reference to FIG.
In the present embodiment, the first belt-like sheet (first sheet) 120 is used as the original fabric of the outer layer sheet 12, and the second belt-like sheet (second sheet) 130 is used as the original fabric of the inner layer sheet 13. The 1st strip | belt-shaped sheet | seat 120 has a stretching property in the longitudinal direction, and the 2nd strip | belt-shaped sheet | seat 130 is a strip | belt-shaped sheet | seat which does not expand | extend substantially in the longitudinal direction.
Thus, the second belt-like sheet 130 is preferably a sheet that does not substantially extend in the longitudinal direction. For example, the second belt-like sheet 130 is the same as the diaper width direction until the tensile load per 25 mm width of the sheet becomes 1.0 N. It is preferable that the elongation rate (elongation rate at the time of 1.0 N / 25 mm) when stretched in the direction is 120% or less, and more preferably the elongation rate is 100 to 110%.

The elongation percentage is measured as follows.
For example, a sample having a width of 25 mm and a length of 50 mm is prepared using a tensile tester such as Tensilon. The sample is pulled between 50 mm with a load of 1.0 N / 25 mm width, and the sample length after extension is measured as A. The elongation rate at that time is defined as follows in the case of the sample of 50 mm. (A-50) / 50 × 100. That is, (sample length after extension at 1.0 N−sample length before extension) / (sample length before extension) × 100. When the sample length after stretching is 100 mm, the stretching rate is 100%, and when the sample length after stretching is 150 mm, the stretching rate is 200%.

  As the sheet that does not substantially extend, a nonwoven fabric, a laminate of a nonwoven fabric and a resin film, a porous film, and the like are preferable. In the present embodiment, the sheet that does not substantially extend is the side that directly contacts the skin of the wearer of the outer envelope continuum 110, and more preferably a water-repellent nonwoven fabric from the viewpoint of preventing leakage of excrement.

  In the manufacturing method of the present embodiment, as shown in FIG. 7, the first belt-like sheet 120 is stretched between the first nip roll 31 and the second nip roll 32 while being continuously conveyed, and the first belt-like belt in the stretched state. The sheet 120 is bonded to the second belt-like sheet 130 that has been continuously conveyed. The first and second nip rolls 31 and 32 are each composed of a pair of rolls, and the rotational speeds of the pair of rolls constituting the second nip roll 32 (peripheral speed, sheet thickness) rather than the pair of rolls constituting the first nip roll 31. Driven to increase the feed rate). Since the second belt-like sheet 130 is a sheet that does not substantially extend, the first belt-like sheet 120 and the second belt-like sheet 130 are the first belt-like sheet 120 in the stretched state and the second belt-like shape in the substantially non-stretched state. The sheet 130 is bonded.

  As shown in FIG. 7, the first belt-like sheet 120 and the second belt-like sheet 130 in the present embodiment are bonded to each other with the leg elastic members 61 a and 61 b and the waist elastic member 51 between the two sheets 120 and 130. It is done in a sandwiched state. Specifically, an adhesive for fixing an elastic member is applied to a predetermined part of one or both of the two belt-like sheets 120 and 130 before the two belt-like sheets 120 and 130 are overlapped. In addition, in a state where the elastic members 61a, 61b, 51 are sandwiched in an extended state, the two belt-like sheets 120, 130 are narrowed by the nip roll 33 to fix the elastic members 61a, 61b, 51 and the two belt-like sheets 120. , 130 are joined. The leg elastic members 61a and 61b are introduced between the belt-like sheets while being swung by a known swing guide in a direction perpendicular to the flow direction of the belt-like sheets 120 and 130. By bonding the first belt-like sheet 120 and the second belt-like sheet 130, the outer packaging material continuous body 110 in which the extent of extension in the longitudinal direction is limited is obtained.

Then, the absorbent main body 10 obtained by cutting the absorbent main body continuous body on the outer packaging material continuous body 110 is rotated by 90 degrees, and is bonded and fixed intermittently. The trim 111 for forming the leg opening is removed to obtain the diaper continuous body 100. The absorptive main body 10 is fixed to the outer packaging material continuous body 110 while maintaining the stretched state of the first belt-like sheet 120. In other words, the absorbent main body 10 is fixed while maintaining the outer wrapping material continuous body 110 so as not to shrink due to the contraction force of the first belt-like sheet 120.
Next, after folding both side portions 12a and 12b of the outer packaging material continuous body 110 in the diaper continuous body 100 so as to cover both end portions of the absorbent main body 10, the diaper continuous body 100 is folded in two. Next, the pants-type disposable diaper 1 is obtained by forming the side seal portions S, S by heat sealing or ultrasonic sealing, or by simultaneously cutting the side seal portions S, S into individual diapers. Can do. The adhesive 15 that fixes the absorbent main body 10 to the outer packaging material continuous body 110 can be applied to either or both of the absorbent main body 10 and the outer packaging material continuous body 110. The trim 111 for forming the leg opening can be removed before the absorbent main body 10 is fixed.

  In the step of forming the side seal portions S, S described above, as shown in FIG. 5 and FIG. 6, the outer layer sheet 12 and the inner layer sheet 13 at the portion of the outer packaging material 11 arranged on the ventral side A, and the back In a state where the inner layer sheet 13 and the outer layer sheet 12 of the portion disposed on the side portion B are laminated in this order, they are pressed between the pair of seal members 71 and 72 and are subjected to sealing processing by applying heat or ultrasonic waves. . The pair of seal members 71 and 74 project from the surface of each of the pair of rolls, and advance or retract so that one or both repeats approaching and separating even if they periodically contact with the rotation of both rolls. It may be what you do.

In this embodiment, prior to such a seal processing, keep applying the site (the pressure site) and adhesive beforehand hot melt before and after applying the seal processing. Specifically, as shown in FIG. 7, a hot melt adhesive 75 is intermittently applied to the second strip sheet before being bonded to the first strip sheet 120. Position for applying the hot melt adhesive after the site where sealing processing is performed (pressurized portions position) and a front and rear, at least one of the hot melt adhesive to each before and after the pressurization site Apply so that the part extends.
Hot-melt adhesive, a width extending in respective longitudinal from the pressurized region (extended width) L (see FIG. 6) is, 1 to 30 mm, it is particularly preferably 5 to 20 mm.

In the present embodiment, the hot-melt adhesive, since a part on each longitudinal from the pressurization site was applied so as to extend, when subjected to sealing processing, the first strip-shaped sheet 120, holes Ya Cutting is difficult to occur. Therefore, a high quality diaper can be manufactured with a good yield.
The hot-melt adhesive can be applied to either one or both of the first belt-like sheet 120 and the second belt-like sheet 130 that are attached to each other. As shown in FIG. be kept by applying the 130, intermittent coating accuracy and onto the pressure region, the adhesive is preferred from the viewpoint of preventing the seeping in coated portion back side of the sheet. Moreover, as a hot melt adhesive coating machine, various known ones can be used, but since it can be applied uniformly to the sheet surface, sheet damage due to pressure processing can be suppressed, and high precision intermittent From the viewpoint of having coatability, a slot coater is preferable. The coating basis weight of the hot melt adhesive is preferably 1 to 15 g / m ² , particularly preferably 2.5 to 5 g / m ² .

  In the present embodiment, as the second belt-like sheet 130, since a sheet that does not substantially extend in the longitudinal direction is used, even if the first belt-like sheet 120 is a sheet having excellent stretchability in the longitudinal direction, The outer wrapping material continuous body 110 obtained by pasting it in the stretched state with the second belt-like sheet 130 that does not substantially stretch does not stretch any more, or slightly stretches when it is slightly stretched. (So-called growth growth). Therefore, if the outer packaging material continuum 110 is transported with a certain level of tension, even if the tension applied to the outer wrapping material continuum 110 fluctuates during transportation, the elongation amount (elongation rate) of the outer packaging material continuum 110 is Fluctuation hardly occurs. Therefore, even if the hot-melt adhesive is applied before the first belt-like sheet 120 and the second belt-like sheet 130 are bonded together, a positional deviation occurs between the coating portion and the portion to be sealed. Hateful.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to each embodiment mentioned above, It can change suitably.
For example, in the above-described embodiment, as shown in FIG. 5, both of the two sheets 12 and 13 that form the ventral side A and the two sheets 12 and 13 that form the back side B, Although pressure was applied in a state where the adhesive 75 was extended before and after the part to be pressed, only the adhesive 75 disposed between the sheets 120 and 130 on either the ventral side A or the back side B was covered. You may pressurize in the state extended before and behind the pressurization site | part.

  The pressurizing process of the present invention may be a process of cutting an elastic member such as a leg elastic member instead of the sealing process for forming the side seal part. For example, it is preferable that the leg elastic member does not exhibit elastic stretchability in the vicinity of the central part of the diaper width direction, and after introducing the leg elastic member continuously, a part of the elastic elastic member is made inelastic. As shown in FIG. 7, after the leg elastic members 61a and 61b are continuously introduced between the first belt-like sheet 120 and the second belt-like sheet 130, the leg elastic members 61a from above both sheets. , 61b is heated and pressed by a convex part. In this method, the stretchable belt-like sheet is likely to be cut around the pressurized portion (particularly before and after the flow direction) by the convex portion, and the cut may cause inconvenience such as deterioration of the appearance. However, by arranging the hot-melt adhesive so that a part extends from each of the parts to be pressurized by the convex part (the part to be pressurized), such cuts are less likely to occur, Since it does not spread even if it occurs, it is possible to prevent the appearance from deteriorating.

  Further, the wearing article in the present invention is a pants-type absorbent article such as a pants-type disposable diaper, a pants-type sanitary napkin, a pants-type incontinence pad, a disposable underwear that does not have an absorbent main body or an absorbent core, Sanitary shorts or other pants-type wearing articles may be used. In addition, a so-called unfolded diaper, a non-pants sanitary napkin, an incontinence pad, etc. that fastens and wears a fastening tape provided in one part in the longitudinal direction to a landing tape provided in the other part It may be.

It is a perspective view which shows the underpants type disposable diaper as an example of the wearing article manufactured by the manufacturing method of this invention. It is a top view which shows the unfolded state of the diaper shown in FIG. It is the II-II sectional view taken on the line of FIG. It is a figure which shows the detail of the side seal part of the diaper of FIG. It is sectional drawing which shows the laminated structure of the to-be-processed part pinched | interposed into a pair of sealing member in a sealing device, and a pair of sealing member. It is the top view which looked at a pair of side seal part in a diaper manufacture process from the direction perpendicular to the field. It is a model perspective view which shows the outline of the manufacturing process of an underpants type disposable diaper.

Explanation of symbols

1 Pants-type disposable diapers (wear items)
2 Top sheet 3 Back sheet 4 Absorbent core 10 Absorbent body 11 Outer packaging material 12 Outer layer sheet 120 First belt-like sheet (first sheet)
13 Inner layer sheet 130 Second strip sheet (second sheet)
75 Hot-melt adhesive 75a, 75b Parts extending from the pressed part in the hot-melt adhesive

Claims (3)

In the manufacturing method of a wearing article comprising a step of partially applying pressure processing to the laminate in which the first sheet having elasticity and the second sheet are laminated,
The wearing article is a pants-type wearing article provided with an outer packaging material having a laminated structure of the first sheet and the second sheet, and the pressurizing process is arranged on the stomach side during wearing in the outer packaging material. And a portion disposed on the back side are overlapped in a state where the surfaces on the second seat side are in contact with each other, and sandwiched between a pair of seal members to form a side seal portion Heat sealing process,
The first sheet is a belt-like sheet having elasticity in the longitudinal direction, and the second sheet is a belt-like sheet that does not substantially extend in the longitudinal direction,
The first sheet is elongated in the longitudinal direction while being continuously conveyed, and the elongated first sheet and the second sheet that has been continuously conveyed are bonded together, and then the laminated bodies are bonded to the laminated body. Apply the pressure processing in a stacked state ,
Before the pasting, a hot-melt adhesive is applied to the surface of the second sheet on the first sheet side, and the first sheet extends in the direction in which the first sheet is subjected to the pressing process on both sheets. The hot-melt adhesive is applied so that a part of the hot-melt adhesive extends in the front and rear directions in the same direction , and the hot-melt adhesive has a width of 1 to The manufacturing method of the wearing article coated so that it may become 30 mm . The pre-Symbol heat sealing process, stronger and pressurized and heated portion, a relatively weak pressure and the heated portion to form a side seal portion formed, the manufacturing method of the wearing article according to claim 1, wherein . The wearing article according to claim 1 or 2 , wherein the first sheet is made of a material containing one or more thermoplastic elastomers selected from polyurethane, polyolefin, styrene, and polyester thermoplastic elastomers. Manufacturing method.

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