JP4758821B2 - Method for producing disposable absorbent article - Google Patents

Description

  The present invention relates to a method for manufacturing a disposable absorbent article provided with a breaking portion for breaking a front portion or a back portion.

There exists a thing of patent document 1 as a disposable absorbent article with which the conventional fastening member for refastening was equipped. This disposable absorbent article has a pant-type configuration before breaking the breakage part, and can be used like a refastened diaper by using a fastening member after breaking the breakage part. ing.
JP-T-2004-524929

  In the above-described disposable absorbent article, when an elastic function is applied to a portion of the absorbent article that is applied around the waist of the wearer, an elastic member is often provided in an extended state. Is called. However, the stretchable member may become an obstacle when breaking the fractured portion.

  Then, the problem which should be solved by this invention is providing the manufacturing method of the disposable absorbent article which did not become an obstruction when an elastic member fractures | ruptures a fracture | rupture part.

In order to solve the above-mentioned problems, the invention according to claim 1 is provided with a waist opening, left and right leg openings, and a stretched state on the front or back of the wearer. Provided in the longitudinal direction in the front part or the back part, and the front part or the back part is fractured by the fracture part and the fracture part for breaking the front part or the back part. A fastening member provided for re-fastening, and the elastic member is a method for producing a disposable absorbent article, the cut end of which is cut away from the fracture portion, At least one of the front part and the back part of the continuous body while conveying a continuous body in which the material for constituting the absorbent article is continuously continuous in the lateral direction with respect to the absorbent article as a reference In the part corresponding to An elastic member applying step of continuously applying the elastic member along a hand direction, an elastic member cutting step of cutting the elastic member such that a cut end of the elastic member is separated from the fracture portion, and the continuous A weakening treatment step of weakening the elastic member applied to a joining region of the body to which the fastening member is joined; a fastening member provisioning step of joining the fastening member to the continuum after the weakening treatment; A rupture portion forming step of providing the rupture portion in a portion corresponding to one of the front portion and the back portion of the continuum and a product dividing step of dividing the continuum into product units are provided.
Moreover, in invention of Claim 2, it is a manufacturing method of the disposable absorbent article which concerns on invention of Claim 1, Comprising: In the said elastic member provision process, the adhesive agent for joining the said elastic member and the said continuous body is provided. While applying to the elastic member or the continuous body, the elastic member is continuously applied to the continuous body, and in the elastic member cutting step, before the adhesive applied in the elastic member applying step is cured. The elastic member is cut at or near the position where the rupture portion is formed in the continuum, and the elastic member is contracted, and the cut end of the elastic member is formed along with the contraction. Retreat from the position to be separated.

Further, in the invention of claim 3, a method for producing a disposable absorbent article according to the invention of claim 1 or claim 2, wherein the elastic member cutting process, Ru done before the weakening process.
Moreover, in invention of Claim 4, it is a manufacturing method of the disposable absorbent article which concerns on invention of Claim 3, Comprising: In the said weakening process process, of the said elastic member cut | disconnected by the said elastic member cutting process in the said continuous body The weakening process is performed on the elastic member on both sides of the cut portion in the longitudinal direction.

The invention according to claim 5 is the method for manufacturing a disposable absorbent article according to any one of claims 1 to 4 , wherein the elastic member cutting step is performed before the breaking portion forming step. Is called.

  According to the first aspect of the invention, after the elastic member is continuously applied to the continuum, the elastic member is cut so that the cut end of the elastic member is separated from the fracture portion. It is possible to easily realize a configuration in which an elastic member is not present at the fracture portion.

  Moreover, since the weakening process is performed before the fastening member is joined to the elastic member provided in the joining region to which the fastening member is joined in the continuum, the fastening member is wrinkled or distorted due to the contraction force of the elastic member. Can be prevented, and the function of the fastening member can be prevented from being impaired.

  Moreover, the weakening process with respect to an elastic member can be reliably performed by giving a fastening member after performing a weakening process with respect to an elastic member, without damaging a fastening member.

  In addition, since the elastic member cutting step and the weakening treatment step are performed in separate steps, the elastic member cutting treatment corresponding to the fracture portion and the elastic member weakening treatment corresponding to the joining region of the fastening member are each reliably performed. be able to.

According to the third aspect of the invention, since the elastic member cutting step is performed before the weakening treatment step, the contraction force of the elastic member is effectively used when the elastic member is cut in the elastic member cutting step. And the structure which does not have an elastic member in a fracture | rupture part is realizable more reliably.

According to the invention of claim 5 , since the amount of movement of the elastic member due to contraction at the time of cutting tends to be larger as the time has not elapsed since the elastic member was applied to the continuum, earlier. By cutting the elastic member in stages, the cut end can be reliably and easily separated from the fractured portion by utilizing the contraction of the elastic member.

<Configuration of disposable absorbent article>
First, the configuration of a disposable absorbent article (hereinafter simply referred to as “absorbent article”) to which a manufacturing method according to an embodiment of the present invention is applied will be described.

  FIG. 1 is a perspective view of an absorbent article to which a method for manufacturing a disposable absorbent article according to an embodiment of the present invention is applied, and FIG. 2 is a broken view of a front left part of the absorbent article of FIG. FIG. 3 is a diagram showing a state in which the left and right side joints are developed in the absorbent article of FIG. 1, and FIG. 4 is a cross-sectional view taken along line AA of FIG. 5 is a cross-sectional view taken along line BB in FIG. In this specification, the term “front / rear / left / right” refers to the wearer. For example, the left hand side of the wearer is referred to as the left, and the right hand side is referred to as the right. Moreover, the longitudinal direction Y (refer FIG. 3) of the absorbent article 1 means the direction corresponding to the up-down or front-back direction of the absorbent article 1, and the horizontal direction X (refer FIG. 3) of the absorbent article 1 is absorptive. The direction corresponding to the left-right direction of the article 1 is said.

The absorbent article 1, as shown in FIGS. 1 to 5, the absorbent article main body 2, the fastening sheet 3L of pair a fastening member for re-engagement to be provided to the absorbent article main body 2, 3R. The absorbent article main body 2 is disposed at a position corresponding to the outer packaging material 11 provided on the outer side of the absorbent article main body 2 and the crotch portion of the absorbent article main body 2 and is bonded to the skin surface side of the outer packaging material 11. The main body 12 is provided.

  The exterior material 11 includes a front part 13 applied to the front part of the wearer and a back part 14 applied to the back part of the wearer. In addition, although the example where the front part 13 and the back part 14 of the exterior material 11 are configured separately is shown here, the front part 13 and the back part 14 may be continuously connected and integrated.

  The left and right edge portions 13a of the front portion 13 and the left and right edge portions 14a of the back portion 14 are joined to each other by predetermined joining means in a state of facing each other, thereby forming left and right side joint portions 15. For this reason, this absorbent article 1 has a pants-type configuration having a waist opening 16 and left and right leg openings 17L and 17R. As a joining means of the side joining part 15, it is performed by any one of ultrasonic welding, heat welding, adhesion by an adhesive (for example, hot melt adhesive), or a combination thereof.

  Breaking portions 18 </ b> L and 18 </ b> R for breaking the front portion 13 are provided at portions of the front portion 13 that are shifted to the left and right from the center in the lateral direction X. The broken portions 18L and 18R are perforated or the like, and the broken portions 18L and 18R are in a connected state when shipped from the factory. And when a user fractures | ruptures these fracture | rupture parts 18L and 18R, the front part 13 will be parted in the position of the fracture | rupture parts 18L and 18R, and the absorbent article 1 can be expand | deployed. For this reason, for example, in a state where the rupture portions 18L and 18R are connected, the absorbent article 1 can be used by peeling the legs through the leg openings 17L and 17R (that is, a pants-type disposable). Can be used as a diaper). Moreover, in the state which cut | disconnected the fracture | rupture parts 18L and 18R, for example, this absorbent article 1 can be applied to a wearer's buttocks, and can be mounted | worn like a diaper (namely, a tape type disposable diaper which can be refastened) Can be used as).

  The front portion 12a facing the front portion 13 of the absorbent main body 12 is bonded to the skin side surface in the intermediate region 13B between the fracture portions 18L and 18R of the front portion 13 such as an adhesive (for example, a hot melt adhesive). It is joined using means. Moreover, the back side part 12c facing the back part 14 of the absorptive main body 13 is joined to the skin side part of the back part 14 using joining means, such as an adhesive (for example, hot melt adhesive).

  Further, the width W1 in the lateral direction X of the front portion 12a of the absorbent main body 12 is set to be larger than the interval D1 between the break portions 18L and 18R, and the left and right edge portions 12d of the front portion 12a exceed the break portions 18L and 18R. Projecting laterally outward X. As a result, the front portion 12a is positioned inward in the lateral direction X from the fractured portions 18L and 18R, and is joined to the front portion 13 by an adhesive or the like, and to the left and right sides of the joint region 12A. An overhanging region 12B is formed.

  The left and right fastening sheet materials 3L and 3R include a substantially sheet-like base material sheet 21 formed of a nonwoven fabric or the like, and a first attachment portion 22 provided on the free end side of the base material sheet 21. ing. The first attachment portion 22 is detachably attached to a second attachment portion 23 provided on the outer surface of the front portion 13 of the absorbent article body 2. The second adhesion portion 23 is provided on the outer surface side of the portion located between the fracture portions 18L and 18R of the front portion 13. As long as the 1st adhesion part 22 and the 2nd adhesion part 23 are the structures which can be reattached mutually, arbitrary structures are employable. For example, you may make it comprise the hook_and_loop | surface fastener which the 1st adhesion part 22 and the 2nd adhesion part 23 re-fasten by mechanical engagement. For example, a hook material can be used for the first attachment portion 22 and a loop material with which the hook material is engaged with the second attachment portion 23 can be used. In this case, the second adhering portion 23 may be formed by sticking a sheet-like loop material to the front portion 13, or the surface itself of the nonwoven fabric or the like constituting the outer surface of the front portion 23 may be the first. You may utilize as 2 adhesion part 23. Here, as a representative example, a hook material is used for the first attachment portion 22 and a loop material is used for the second attachment portion 23. In this way, by using the second attachment portion 23 provided on the outer surface of the absorbent article 1 as a loop material, the second attachment portion 23 may undesirably engage with the wearer's clothes and bedding, or during manufacture. Troubles such as being caught in the manufacturing equipment can be prevented.

  As a hook material constituting the hook-and-loop fastener, a polyolefin hook material having a plurality of hook portions such as a hook shape, a hook shape, and a mushroom shape can be used. As the loop material, any loop material that can be engaged with the hook material such as woven fabric, knitted fabric, and non-woven fabric can be used.

  As another specific example, a loop material may be used for the first attachment portion 22 and a hook material may be used for the second attachment portion 23. Alternatively, an adhesive sheet may be used for the first attachment portion 22 and the adhesive sheet may be detachably attached to the second attachment portion 23.

  The base sheet 21 of the fastening sheet materials 3L and 3R includes a main body portion 21a and two tongue pieces 21b that are divided into two forks from the main body portion 21a and extend to the free end side of the base sheet 21. Have. The base sheet 21 is folded in two along a fold line C1 along the longitudinal direction Y, and a portion facing the front portion 13 of the main body 21a is an adhesive (for example, a hot melt adhesive) or the like. It is joined to the skin surface side of the front part 13 by the joining means. A joining region 13A (see FIG. 1) to which the base sheet 21 is joined in the front portion 13 is set outward in the lateral direction X of the left and right fracture portions 18L and 18R. Moreover, in the state folded in half, the part of the free end side of the base material sheet 21 provided with the two tongue pieces 21b is folded back outward in the lateral direction X. The first adhering portion 22 is a folded portion (here, two tongue piece portions 21b) folded back outward in the lateral direction X of the base material sheet 21 so as to be positioned between the two folded base material sheets 21. ).

  And such fastening sheet | seat material 3L, 3R can expand | deploy the part which the fastening sheet | seat material 3L, 3R turned back, as shown by arrow E1 of FIG. 2 when the fracture | rupture parts 18L, 18R of the front part 13 are fractured | ruptured. It is like that. Then, the absorbent article 1 is attached to the wearer like a diaper by attaching the first attachment portion 22 of the developed fastening sheet materials 3L and 3R to the second attachment portion 23 of the front portion 13. Can be done. Accordingly, the absorbent article can be confirmed by attaching and detaching the fastening sheet materials 3L and 3R to confirm the contamination of the absorber 41, which will be described later, or by adjusting the attachment position of the fastening sheet materials 3L and 3R to the second attachment portion 23. 1 can be fitted to the wearer's body shape. Moreover, since the fastening sheet materials 3L and 3R are provided on the left and right, the absorbent article 1 that can be refastened on both the left and right sides can be configured.

  Further, the width W1 of the front portion 12a of the absorbent main body 12 is larger than the distance D2 between the outer edge portions in the lateral direction X of the left and right fastening sheet materials 3L and 3R joined to the front portion 13 in a folded state. It is set large. In this state, the fastening sheet materials 3L and 3R are disposed between the absorbent main body 12 and the front portion 13 so as to be completely covered by the front portion 12a of the absorbent main body 12.

  Thus, in the state where the rupture portions 18L and 18R are not ruptured, the fastening sheet materials 3L and 3R are provided on the skin surface side of the front portion 13, so the fastening sheet materials 3L and 3R Inconveniences such as adhering to the bedding can be prevented. Further, since the base sheet 21 of the fastening sheet materials 3L and 3R is folded in half so as to sandwich the first attachment portion 22 inside, the first attachment portion 22 undesirably adheres to other members. It is possible to prevent inconvenience such as end. Further, since the fastening sheet materials 3L and 3R are disposed between the absorbent main body 12 and the front portion 13 in a state where the fastening sheet materials 3L and 3R are completely covered by the absorbent main body 12, the fastening sheet materials 3L and 3R are attached to the wearer. It does not contact the skin and does not damage the wearer's skin, and can also prevent troubles such as the fastening sheet materials 3L and 3R being caught by a manufacturing apparatus or the like during manufacture. Moreover, the large absorbent body 41 can be provided by making the absorptive main body 12 into a wide structure, and the improvement of the absorption capacity | capacitance of excrement and the improvement of leakage prevention performance can be aimed at.

  Further, in the left and right overhanging regions 12B located outward in the lateral direction X of the breaking portions 18L and 18R in the front portion 12a of the absorbent main body 12, an adhesive member 24 is attached to the surface facing the front portion 13 side with an adhesive ( For example, it is joined by joining means such as a hot melt adhesive. This attachment member 24 is for attaching the overhang | projection area | region 12B in the front side part 12a of the absorptive main body 12 to the front part 13 side, for example, is comprised by the hook material. When this adhesion member 24 is engaged and adhered to the skin surface side surface of the front portion 13 or the base sheet 21 of the fastening sheet materials 3L and 3R, the overhanging region 12B of the absorbent main body 12 becomes the front portion 13 side. It comes to adhere to. Accordingly, an effect of reinforcing the broken portions 18L and 18R so as not to be undesirably broken can be obtained. Moreover, since the overhang | projection area | region 12B of the absorptive main body 12 can be stabilized, when raising and lowering the absorptive article 1, the right and left edge parts 12d of the front side part 12a of the absorptive main body 12 turn up or bend. Can be prevented. Further, in the manufacturing process, the lateral X end portion of the front side portion 12a of the absorbent main body 12 can be turned over, and the fastening sheet materials 3L and 3R can be prevented from being caught by the manufacturing apparatus and the absorbent main body 12 from being bent.

  The upper edge of the front portion 13 except for the breaking portion forming region 13B where the left and right breaking portions 18L, 18R are formed and the joining region 13A where the left and right fastening sheet materials 3L, 3R are joined. The elastic member 26 for waist is extended | stretched along the part. Further, a waist elastic member 27 is stretched along the upper edge of the upper edge of the back portion 14. And the upper edge part of the front part 13 and the back part 14 fits a wearer's waist by the contraction force of these elastic members 26 and 27 for waists, and leakage of excrement, such as urine, is prevented.

Further, the leg elastic members 28 and 29 are provided in a stretched state along the edge portions of the front portion 13 and the back portion 14 forming the leg openings 17L and 17R. And the edge part which forms the front part 13 and the opening parts 17L and 17R for legs fits around a wearer's leg by contraction force of these elastic members 28 and 29, and leakage of excrement, such as urine, is carried out. Is prevented. In particular, due to the action of the leg elastic member 29, the edges forming the leg openings 17L and 17R of the back part 14 fit firmly to the wearer's buttocks.

  Furthermore, in a portion (an intermediate portion in the longitudinal direction Y of the front portion 13) located around the wearer's torso in the front portion 13, left and right fracture portion forming regions 13B, left and right joining regions 13A and a second attachment portion 23 are provided. The body elastic member 30 is provided in an extended state along the lateral direction X except for the intermediate region 13C provided. In addition, the portion located around the wearer's torso in the back portion 14 (intermediate portion in the longitudinal direction Y of the back portion 14), except for the joining region 14A (see FIG. 6C) where the absorbent main body 12 is joined. The elastic member 31 for the body is provided in an extended state along the lateral direction X. And the middle part of the longitudinal direction Y of the front part 13 and the back part 14 can be fitted to a wearer's trunk | drum with the contraction force of these elastic members 30 and 31 for bodies.

  Here, although not illustrated in FIG. 1 and FIG. 2, the elastic members 26, 28, and 30 are also weakened in the joining region 13 </ b> A to which the fastening sheet materials 3 </ b> L and 3 </ b> R of the front portion 13 are joined. In addition, the elastic members 28 and 30 are also present in the intermediate region 13C in a weakened state. Further, the elastic members 29 and 31 are also present in the bonded region 14A of the back portion 14 in a weakened state. These weakening processes will be described in detail later in the description of the manufacturing method.

  As described above, since the elastic members 26, 27, and 30 positioned in the joining region 13A are weakened, the fastening sheet materials 3L and 3R are prevented from being wrinkled or distorted, and the functions of the fastening sheet materials 3L and 3R are improved. It can be prevented from being damaged.

  Further, the elastic members 26, 28, 30 provided on the front portion 13 are cut so that the cut ends 26a, 28a, 30a (see FIGS. 5 and 6A) are separated from the fracture portions 18L, 18R. Yes. More specifically, for example, the rupture portions 18L and 18R are intermittently provided along the longitudinal direction Y in the sheet materials 36 and 37 and a plurality of elongated cut portions provided between the cut portions. When it consists of a connection part, the cut ends 26a, 28a, 30a of the elastic members 26, 28, 30 are separated from the connection part in the lateral direction Y.

  Thus, since the elastic members 26, 28, 30 are cut so that the cut ends 26a, 28a, 30a are separated from the broken portions 18L, 18R, the elastic members 26 are broken when the broken portions 18L, 18R are broken. , 28 and 30 do not become obstacles, and the fracture portions 18L and 18R can be easily fractured.

  Here, it is preferable to utilize the contraction of the elastic members 26, 28, 30 at the time of cutting to separate the cut ends 26a, 28a, 30a of the elastic members 26, 28, 30 from the fracture portions 18L, 18R. For example, in the vicinity of the fracture portions 18L and 18R, the joining force between the elastic members 26, 28, and 30 and sheet materials 36 and 37 (to be described later) sandwiching the elastic members is set weak, or the elastic members 26, 28, and 30 It is better not to perform bonding. Then, when the elastic members 26, 28, 30 are cut at or near the positions where the fracture portions 18L, 18R are formed, the elastic members 26, 28, 30 are contracted, and the cut ends 26a, 28a, 30a. Retreats away from the fractured portions 18L, 18R. More specifically, for example, when the elastic members 26, 28, 30 are joined to the sheet materials 36, 37 with an adhesive (for example, hot melt adhesive), the adhesive is applied in the vicinity of the fracture portions 18L, 18R. It is better to reduce the coating amount and the coating area.

  Next, a more detailed description of each part of the absorbent article 1 will be given.

  The front portion 13 is configured by sandwiching elastic members 26, 28, 30 between two sheet materials 36, 37 made of nonwoven fabric or the like. The joining of the sheet materials 36, 37 and the joining of the elastic members 26, 28, 30 to the sheet materials 36, 37 use joining means such as an adhesive (for example, hot melt adhesive), heat welding, ultrasonic welding or the like. Done. The back portion 14 is also configured by sandwiching elastic members 27, 29, 31 between two sheet materials 38, 39 made of nonwoven fabric or the like. The joining of the sheet members 38, 39 and the joining of the elastic members 27, 29, 31 to the sheet members 38, 39 are performed using a joining means such as an adhesive (for example, hot melt adhesive), heat welding, ultrasonic welding or the like. Done.

  As shown in FIGS. 3 and 4, the absorbent main body 12 includes a main body portion 42 provided with an absorbent body 41 that absorbs the excrement of the wearer, and left and right standing portions 43. The main body 42 is configured by sandwiching the absorber 41 between a water-repellent or liquid-impervious back sheet 44 and a liquid-permeable top sheet 45. For this reason, the excrement of the wearer is absorbed and held by the absorbent body 41 via the top sheet 45. Further, by making the back sheet 44 water-repellent or liquid-impervious, excrement in the absorbent body 41 is prevented from leaking outside.

  The standing portion 43 is formed by joining the left and right edges of the back sheet 44 and the top sheet 45 to each other and folding them back to the skin surface side of the main body 41. The joining of the back sheet 44 and the top sheet 45 and the joining of the absorber 41 to the back sheet 44 or the top sheet 45 are performed by a joining means such as an adhesive (for example, a hot melt adhesive).

  More specifically, at the free end of the upright portion 43, the left and right outer edge portions of the backsheet 44 are folded back inward in a substantially bag shape, and the elastic member for standing up 46 is wrapped freely in the backsheet 44. It is given in a stretched state along the end. And the standing part 43 stands | starts up to a wearer's skin side by the contraction force of this elastic member 46 for standing | standby, and fits a skin surface. And by this standing part 43, what was not absorbed into the absorber 41 through the top sheet 45 among the excrement of the wearer is prevented from leaking outward in the lateral direction X. . The front end portion and the back end portion of the standing portion 43 are joined to the main body portion 42 by a joining means such as an adhesive (for example, a hot melt adhesive), and the longitudinal intermediate portion of the standing portion 43 is Standing up.

  Here, a supplementary description will be given of the joining form of the absorbent main body 12 and the back portion 14. The region where the absorbent body 41 is mainly provided on the outer side surface (back sheet 44) of the absorbent main body 12 is joined to the skin surface side of the back portion 14, and the region outside the absorbent body 41 is not joined to the back portion 14. It is desirable to make it. As a result, a region outside the absorbent body 41 of the absorbent main body 12 becomes free, and the standing portion 43 is easily raised.

  Moreover, in the structure shown in FIG. 3 etc., although the width | variety X of the horizontal direction of the absorber 41 located in the front side part 12a is made larger than the space | interval D1 between the fracture | rupture parts 18L and 18R on either side, The width of the portion may be smaller than the interval D1.

  Next, the material of each part of the absorbent article 1 will be described.

As the sheet materials 36 and 38 outside the front portion 13 and the back portion 14, a sheet material such as a water-repellent synthetic fiber nonwoven fabric or a liquid-impermeable plastic film is preferably used, and in particular, a basis weight of 10 to 30 g / m ² . A polypropylene spunbond nonwoven is preferred.

  As the elastic members 26 to 31, 46, an elastic stretchable material (for example, polyurethane film, natural rubber, etc.) used for a normal disposable absorbent article is used, and is sandwiched between the sheet materials in an expanded state. Preferably, a polyurethane yarn having a fineness of 300 to 2000 dtex is sandwiched between the sheet materials in a state of being stretched at a magnification of 1.1 to 5.0 times.

When the elastic members 26 to 31 and 46 are bonded to the sheet material using a hot melt adhesive, a method of directly applying the hot melt adhesive to the elastic members 26 to 31 and 46, directly or indirectly to the sheet material The hot melt adhesive is applied by a method appropriately selected from the methods for applying the hot melt adhesive. When applying directly to the elastic members 26 to 31, 46, it is desirable to apply an amount of 0.01 to 1.0 g / m per one elastic member 26 to 31, 46. Moreover, when apply | coating directly to a sheet | seat material (coater coating), it is desirable to apply | coat the quantity of 10-40 g / m < ² >. Moreover, the indirect coating on the sheet material (spiral coating, curtain coating, zigzag coating) in the case of, it is desirable to apply the amount of 1 to 10 g / m ^2. The hot-melt adhesive used is a rubber-based hot-melt adhesive containing a styrene-based block polymer as a base polymer, and an olefin-based containing an ordinary olefin such as an amorphous polyalphaolefin (APAO) such as an ethylene / propylene copolymer. A hot melt adhesive, ethylene-vinyl acetate copolymer (EVA) or polyester containing polyester as a base polymer may be used, but a rubber-based hot melt adhesive is used for the purpose of firmly joining the elastic members 26 to 31. preferable.

As the back sheet 44 of the absorbent main body 12, a sheet material such as a water-repellent synthetic fiber nonwoven fabric, a liquid-impervious plastic film, or a composite material thereof is preferably used, among which polyethylene having a basis weight of 10 to 40 g / m ² is used. A moisture permeable plastic film is preferred.

As the top sheet 45, a sheet material such as a liquid-permeable synthetic fiber nonwoven fabric or a plastic film provided with a plurality of holes is suitably used, and an air-through nonwoven fabric made of polyolefin having a basis weight of 10 to 30 g / m ² is particularly preferable. .

  As the absorbent body 41, an absorbent body 41 formed by wrapping an aggregate of hydrophilic fibers such as pulverized pulp fibers and cellulose fibers with a liquid-permeable sheet material such as tissue paper or nonwoven fabric is used. In order to increase the processing capacity of excrement, a super absorbent resin powder may be mixed into the aggregate. The highly water-absorbent resin powder is a powdery polymer resin mainly composed of polyacrylic acid or the like. The absorber 41 to which the present embodiment is applied desirably includes 20% by weight or more of the superabsorbent resin powder, and more preferably includes 20 to 80% by weight. More preferably 20 to 60% by weight is included. If it is less than 20% by weight, the amount of highly water-absorbent resin powder is small, and the return from the absorber 41 increases. On the other hand, if it is more than 80% by weight, the absorber 41 becomes hard.

As the sheet base material 21 of the fastening sheet materials 3L and 3R, a sheet material such as a synthetic resin film or a synthetic fiber nonwoven fabric can be used as appropriate. Among them, a spunbonded nonwoven fabric made of polyolefin or polyester having a basis weight of 30 to 100 g / m ² is preferable.

<Method for producing disposable absorbent article>
Below, with reference to Drawing 6 (a)-Drawing 6 (c), Drawing 7 (a), Drawing 7 (b), etc., the manufacturing method of the disposable absorbent article concerning this embodiment is explained.

This manufacturing method is
(S01) Front continuum forming step (S02) Front elastic member cutting step (S03) Front elastic member weakening treatment step (S04) Fastening member applying step (S05) Breaking portion forming step (S06) Back continuum forming step (S07) Back elastic member weakening treatment process (S08) Absorbent main body application process (S09) Leg circumference molding process (S10) Folding process (S11) Side joining process (S12) A product dividing process is provided. The steps are processed according to the order of description, but regarding the relationship between steps S01 to S05 and steps S06 and S07, steps S01 to S05 and steps S06 and S07 may be performed in parallel. Alternatively, steps S01 to S05 may be performed before or after steps S06 and S07. Further, the fracture portion forming step S05 may be performed before the steps S02 to S04, or may be performed between any of the steps S02 to S04.

In steps S01 to S05, as shown in FIGS. 6 (a) and 6 (b), the front continuous body 51 and the like for constituting the front portion 13 are being transported in the transport direction F1 along the longitudinal direction. Processing is performed. In the front continuum forming step S01, a front continuum 51 for forming the front portion 13 is formed. The front continuum 51 is a material in which the material for constituting the front portion 13 is continuously connected in the lateral direction X with reference to the absorbent article 1, and between the continuums of the sheet materials 36 and 37. The elastic members 26A, 28A, 30A for constituting the elastic members 26, 28, 30 are sandwiched and continuously arranged. The front continuous body forming step S01 corresponds to the elastic body applying step according to the present invention. Further, conveying direction F1 of the front continuum 51 to the conveying direction F3 when parallel conveying a front continuum 51 and the back continuum 52 conveying direction F2, and later of the back part continuous body 52 you later It is set to be approximately parallel.

  Here, in this embodiment, since the front portion 13 and the back portion 14 are configured separately, a front continuous body 51 for configuring the front portion 13 and a back continuous body 52 to be described later for forming the back portion 14 However, when the front portion 13 and the back portion 14 are integrally formed, the front continuous body 51 and the back continuous body 52 are integrally formed.

  Moreover, in the absorbent article 1 to which the manufacturing method according to the present embodiment is applied, the rupture portions 18L and 18R, the fastening sheet materials 3L and 3R, and the second adhesion portion 23 are provided on the front side of the absorbent article 1. However, it is good also as a structure by which the fracture | rupture parts 18L and 18R, fastening sheet material 3L and 3R, and the 2nd adhesion part 23 are provided in the back side of the absorbent article 1. FIG.

  In the subsequent front elastic member cutting step S02, the elastic members 26A, 28A, 30A sandwiched in the front continuous body 51 are formed in the broken portion forming region 13B where the broken portions 18L, 18R of the absorbent article 1 are to be formed. And cut with a cutter blade. When the elastic members 26A, 28A, and 30A are cut, the cut end portions of the elastic members 26A, 28A, and 30A are retracted from the cut portion due to the contraction force, so that the elastic members 26A, 28A, and 30A are formed in the fracture portion forming region 13B. It will not exist. As described above, after the elastic members 26A, 28A, 30A are continuously applied to the front continuous body 51, the cut ends 26a, 28a, 30a of the elastic members 26A, 28A, 30A are separated from the fracture portions 18L, 18R. Thus, the elastic members 26A, 28A, 30A are cut so that the elastic members 26A, 28A, 30A are easily applied, and the elastic members 26A, 28A, 30A are not present in the fracture portions 18L, 18R. It can be easily realized.

  Further, the elastic members 26A, 28A, 30A are sandwiched between the sheet materials 36, 37 due to factors such as requiring a certain amount of time to cure the joining means (adhesive, etc.) used for joining the elastic members 26A, 28A, 30A. The amount of movement of the elastic members 26 </ b> A, 28 </ b> A, 30 </ b> A due to contraction at the time of cutting tends to increase as the time has not elapsed. Therefore, by cutting the elastic members 26A, 28A, 30A immediately after the formation of the front continuous body 51, the cut ends 26a, 28a, 30A are utilized by utilizing the contraction of the elastic members 26A, 28A, 30A. 30a can be reliably and easily separated from the fracture portions 18L and 18R.

  In the subsequent front elastic member weakening process step S03, a weakening process is performed on the elastic members 26A, 28A, and 30A sandwiched between the portions corresponding to the fastening member joining region 13A of the front continuous body 51. . Moreover, the weakening process with respect to the elastic members 28A and 30A sandwiched between the portions corresponding to the intermediate region 13C of the front continuous body 51 is performed. This weakening process is a process of weakening or substantially eliminating the contraction force of the elastic members 26A, 28A, 30A. For example, the weakening process is performed by cutting the elastic members 26A, 28A, 30A at one place or a plurality of places. For the cutting process, cutting with a rotary die cutter, heating, fusing using ultrasonic waves, or the like is used.

  By performing the weakening process on the elastic members 26A, 28A, 30A provided in the joining region 13A in this way and then joining the fastening sheet materials 3L, 3R, the contraction force of the elastic members 26A, 28A, 30A Wrinkles and distortion can be prevented from occurring in the fastening sheet materials 3L and 3R, and the functions of the fastening sheet materials 3L and 3R are not impaired. Further, by performing a weakening process on the elastic members 28A and 30A provided in the intermediate region 13C, an unreasonable force acts on the absorbent body 41 of the absorbent main body 12 due to the contraction force of the elastic members 28A and 30A. It is prevented that the absorption performance of the body 41 is impaired. Further, by applying the fastener material (3L, 3R, 23) after the weakening treatment is performed on the elastic members 26A, 28A, 30A, the elastic member can be surely damaged without damaging the fastener materials (3L, 3R, 23). It is possible to perform weakening processing on 26A, 28A, and 30A.

  Further, since the elastic member cutting step S02 and the front elastic member weakening processing step S03 are performed in separate steps, the cutting process of the elastic members 26A, 28A, 30A corresponding to the fractured portions 18L, 18R, and the fastening sheet material 3L, The weakening process of the elastic members 26A, 28A, and 30A corresponding to the 3R joining region 13A can be performed reliably.

  Further, since the elastic member cutting step S02 is performed before the front elastic member weakening processing step S03, when the elastic members 26A, 28A, 30A are cut in the elastic member cutting step S02, the elastic members 26A, 28A, By effectively using the contraction force of 30A, it is possible to more reliably realize a configuration in which the elastic members 26A, 28A, 30A are not present in the fracture portions 18L, 18R.

  In the subsequent fastening member application step S04, as shown in FIG. 6B, the fastening sheet materials 3L and 3R and the loop material constituting the second adhesion portion 23 are applied to the front continuous body 51. Formation of the 2nd adhesion part 23 is performed by joining a loop material etc. to the portion corresponding to intermediate field 13C of the outer surface side of front part continuum 51 using the above-mentioned joining means, such as adhesives. The detailed contents of the application process of the fastening sheet materials 3L and 3R will be described in detail later with reference to FIGS.

  In the subsequent fracture portion forming step S05, the fracture portions 18L and 18R are formed.

  On the other hand, in steps S06 and S07 related to the formation of the back portion 14, as shown in FIG. 6C, the back continuous body 52 and the like for constituting the back portion 14 are transported in the transport direction F2 along the longitudinal direction thereof. However, the processing is performed. In the back continuum forming step S06, a back continuum 52 for forming the back 14 is formed. The front continuous body 52 is a material in which the material for forming the back portion 14 is continuously connected in the lateral direction X with reference to the absorbent article 1, and between the continuous bodies of the sheet materials 38 and 39, The elastic members 27A, 29A, 31A for constituting the elastic members 27, 29, 31 are sandwiched in a continuous state.

  In the subsequent back elastic member weakening treatment step S07, the weakening treatment for the elastic members 29A and 31A sandwiched between the portions corresponding to the joining region 14A to which the absorbent main body 12 of the back continuous body 52 is joined is performed. Done. This weakening process is performed by the same method as the above-described front weakening process step S03. Thus, by performing the weakening process on the elastic members 29A and 31A provided in the joining region 14A of the back continuous body 52, it is impossible for the absorbent body 41 of the absorbent main body 12 by the contraction force of the elastic members 29A and 31A. It is prevented that force acts and the absorption performance of the absorber 41 is impaired.

  In the subsequent absorbent main body application step S08 and leg circumference molding step S09, as shown in FIG. 7A, the front continuous body 51 and the back continuous body 52 are juxtaposed in parallel and the conveying direction F3 along their longitudinal direction. The processing is carried out while being conveyed. In the absorbent main body applying step S08, the absorbent main body 12 is bonded to the skin surface side of the front continuous body 51 and the back continuous body 52 by the above-described bonding means such as an adhesive. At this time, the left and right fastening sheet materials 3 </ b> L and 3 </ b> R are positioned between the front continuous body 51 and the absorbent main body 12 in a state of being completely covered by the absorbent main body 12. For this reason, it is possible to prevent troubles such as the fastening sheet materials 3L and 3R being caught by the manufacturing apparatus in a later process.

  Moreover, the absorptive main body 12 is provided to the continuous bodies 51 and 52 in the state to which the above-mentioned adhesion member 24 was provided. For this reason, the attachment member 24 adheres to the fastening sheet materials 3L and 3R on the front continuous body 51 side with the application of the absorbent main body 12 to the continuous bodies 51 and 52, and the front portion 12a of the absorbent main body 12 The lateral X end can be stabilized. Therefore, the lateral X end of the front portion 12a of the absorbent main body 12 is turned over in a later process to prevent the fastening sheet materials 3L and 3R from being caught by a manufacturing apparatus or the like, or the absorbent main body 12 from being bent. it can.

  Then, in the leg-around molding step S09, the portions that form the leg openings 17L and 17R in the back continuum 52 are cut out to form the leg holes 53.

  In the subsequent bi-folding step S10, as shown in FIG. 7B, the front continuous body 51 and the back continuous body 52 are folded into two so as to overlap each other. At that time, the absorbent main body 12 is sandwiched inside.

  In the subsequent side joining step S11, portions corresponding to the side joining portions 15 of the absorbent article 1 in the folds 51 and 52 folded in two are joined by the joining means such as ultrasonic welding described above.

  In the subsequent product dividing step S12, the absorbent article 1 as a finished product is cut and separated for each product.

  Next, the application process of the fastening sheet materials 3L and 3R in the fastening member application process S04 will be described in more detail.

  As shown in FIGS. 6B and 8, the left and right fastening sheet materials 3 </ b> L and 3 </ b> R are applied to the front continuous body 51 in a folded state. More specifically, the left and right fastening sheet materials 3L and 3R have their tongue pieces 21b (free ends) facing outward (that is, upstream or downstream in the conveying direction F1) with the fold lines C1 facing each other. It is designed to be folded. That is, among the fastening sheet materials 3L and 3R, the fastening sheet materials 3L and 3R positioned on the upstream side in the conveyance direction F1 are conveyed with the fold line C1 facing the downstream side in the conveyance direction F1, The fastening sheet materials 3L and 3R located on the downstream side in the direction F1 are conveyed with the fold line C1 facing the upstream side in the conveyance direction F1. For this reason, in the fastening sheet materials 3L and 3R located on the downstream side in the conveyance direction F1, the folded tongue piece portion 21b is easily caught in the manufacturing apparatus and is easily opened on the upstream side in the conveyance direction F1. 6B and 8, the left fastening sheet material 3L is positioned on the upstream side in the transport direction F1, and the right fastening sheet material 3R is positioned on the downstream side in the transport direction F1. However, which fastening sheet material 3L, 3R is positioned on the upstream side depends on the direction of the conveyance direction F1.

  Therefore, in the present embodiment, as shown in FIG. 8, in front of the fastening sheet materials 3L and 3R (for example, the right fastening sheet material 3R) positioned on the downstream side in the transport direction F1 among the left and right fastening sheet materials 3L and 3R. The fastening sheet material 3L, 3R (for example, the left fastening sheet material 3L) positioned on the upstream side in the transport direction F1 is applied to the front continuous body 51 on the downstream side in the transport direction F1. I do it in position. In other words, in the production line, the fastening processing member 56 of the fastening sheet materials 3L and 3R (for example, the right fastening sheet material 3R) positioned on the downstream side in the transport direction F1 among the left and right fastening sheet materials 3L and 3R is transported. The fastening sheet materials 3L and 3R (for example, the left fastening sheet material 3L) positioned on the upstream side in the direction F1 are provided on the downstream side in the transport direction F1 with respect to the application processing unit 57. The application processing of the fastening sheet materials 3L and 3R in the application processing units 56 and 57 is performed using, for example, transfer rolls 56a and 57a and nip rolls 56b and 57b.

  Accordingly, the fastening sheet materials 3L and 3R (for example, the fastening sheet material 3R) which are located on the downstream side in the conveying direction F1 among the left and right fastening sheet materials 3L and 3R and are easily arranged to open the tongue piece portion 21b. However, it is not necessary to pass through the application processing part 57 of the fastening sheet materials 3L and 3R (for example, the fastening sheet material 3R) positioned on the upstream side in the transport direction F1. As a result, it is possible to avoid inconveniences such as the tongue piece portion 21a of the fastening sheet materials 3L and 3R (for example, the fastening sheet material 3R) on the downstream side in the conveying direction F1 being caught and opened when passing the application processing portion 57.

In addition, the fastening sheet materials 3L and 3R (here, the symbol “3” is used for convenience) are introduced into the application processing units 56 and 57 as follows. That is, as schematically shown in FIG. 9, a fastening sheet continuous body 61 in which a material for forming the fastening sheet material 3 is continuously continuous in the longitudinal direction Y with respect to the absorbent article 1 is a front continuous body. 51 intersecting the transport direction F1 (more preferably orthogonal) is introduced to giving processing unit 56, 5 7 while being conveyed along the conveying direction F4, so that it is divided into a predetermined length fastening sheet 3 is obtained It has become. Then, the obtained fastening sheet material 3 is applied to the front continuous body 51 by a conveying means such as a vacuum conveyor or an applying means such as a transfer roll. The fastening sheet continuous body 61 is a continuous body of the base material sheet 21 provided with the first adhesion portion 22. Further, the conveyance direction F4 of the fastening sheet continuous body 61 is a direction parallel to the longitudinal direction of the fastening sheet continuous body 61. The fastening sheet continuous body 61 is divided by a cutting means such as a rotary die cutter.

  For this reason, when applying the fastening sheet material 3 to the front continuous body 51, it is not necessary to rotate the fastening sheet material 3 90 degrees around an axis perpendicular to the conveying direction F4, and the front continuous body 51 of the fastening sheet material 3 The application process can be simplified.

  FIG. 10 exemplarily shows more detailed contents of the process shown in FIG. As shown in FIG. 10, the fastening sheet continuous body 61 is divided into unit lengths in the folded state in which the free end side (the tongue piece portion 21 b) is folded in the transport process along the transport direction F <b> 4. It has come to be. The conveyance direction F4 of the fastening sheet continuous body 61 is set in a direction (more preferably, a direction orthogonal) intersecting the conveyance direction F1 of the front continuous body 51. The fastening sheet continuous body 61 conveyed along the conveying direction F4 is cut into unit lengths by a cutting means (not shown) such as a rotary die cutter in front of the application processing units 56 and 57, whereby the fastening sheet material 3 Is obtained. The obtained fastening sheet material 3 is delivered to the transfer rolls 56a and 57a by a conveying means (not shown) such as a vacuum conveyor. Then, the fastening sheet material 3 is transferred and applied to the front continuous body 51 as the transfer rolls 56a and 57a rotate. At this time, nip rolls 56b and 57b are provided on the opposite side of the transfer rolls 56a and 57a, and the fastening sheet material 3 is nipped between the transfer rolls 56a and 57a and the nip tols 56b and 57b and firmly joined. It is like that. Preferably, the transfer rolls 56a and 57a are provided with suction holes for air suction or the like so that the fastening sheet material 3 can be reliably received.

That is, in the configuration shown in FIG. 10, the fastening sheet material 3 continuous in the longitudinal direction Y intersects the conveyance direction F1 of the front continuous body 51 continuous in the lateral direction X (more preferably orthogonal) with the absorbent article 1 as a reference. Introduced into the application processing units 56 and 57 from the transport direction F4 and delivered to the transfer rolls 56a and 57a. For this reason, it is not necessary to provide a rotator on the transfer rolls 56a, 57a, etc., and the application process and the apparatus configuration can be simplified. Furthermore, fastening the sheet material 3 transfer roller 56a, when received by 57a, the transfer roller 56a of the short-side direction (lateral direction) of the fastening sheet material 3, receives is performed so that along a circumferential direction of 57a. For this reason, the curvature of the fastening sheet material 3 at the time of transfer by the transfer rolls 56a and 57a can be suppressed to be small, and as a result, the entire body portion 21a of the base sheet 21 of the fastening sheet material 3 can be reliably moved forward. It can be joined to the continuous part 51. Further, when the fastening sheet material 3 is applied to the front continuous body 51, the fastening sheet material 3 and the front continuous body 51 are nipped between the transfer rolls 56a and 57a and the nip rolls 56b and 57b. And the front continuum 51 can be reliably bonded with an adhesive or the like, and as a result, it is possible to prevent the fastening sheet material 3 from being detached during use of the absorbent article 1, and the reliability of the product Can be increased.

  In the absorbent article 1 to which the manufacturing method according to the present embodiment is applied, the fastening sheet materials 3L and 3R are disposed between the front portion 13 and the absorbent main body 12 on the skin surface side of the front portion 13. In addition, it is necessary to perform the application process of the fastening sheet materials 3L and 3R before the application process of the absorbent article 12. However, when the configuration in which the fastening sheet materials 3L and 3R are applied to the outer surface side of the front portion 13 is adopted, the fastening sheet materials 3L and 3R may be applied after the absorbent body 12 is applied. Good.

It is a perspective view of the disposable absorbent article to which the manufacturing method of the disposable absorbent article which concerns on one Embodiment of this invention is applied. It is a perspective view which shows the state which fractured | ruptured and developed the fracture | rupture part of the front left side in the disposable absorbent article of FIG. It is a figure which shows the state which expand | deployed the side junction part on either side in the disposable absorbent article of FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. 6 (a) to 6 (c) are diagrams showing a manufacturing process of the disposable absorbent article of FIG. 7 (a) and 7 (b) are diagrams showing a manufacturing process of the disposable absorbent article of FIG. It is explanatory drawing of the fastening member provision process in FIG.6 (b). It is explanatory drawing of the fastening member provision process in FIG.6 (b). It is explanatory drawing which shows more detailed content of the fastening member provision process in FIG.6 (b) exemplarily.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Absorbent article, 2 Absorbent article main body, 3, 3L, 3R Fastening sheet material, 11 Exterior material, 12 Absorbent main body, 12a Front side part, 12c Back side part, 12d Edge part, 12A Joining area, 12B Overhang area , 13 Front part, 13a Edge part, 13A Joining area, 13B Breaking part formation area, 13C Intermediate area, 14 Back part, 14a Edge part, 15 Side joint part, 16 Waist opening part, 17L, 17R Leg opening part, 21 Base material sheet, 21a body part, 21b tongue piece part, 22 1st adhesion part, 23 2nd adhesion part, 24 adhesion member, 26, 27 Elastic member for waist, 28, 29 Elastic member for leg, 26a, 28a, 30a Cut end, 26A to 31A Elastic member, 30, 31 Body elastic member, 36 to 38 Sheet material, 41 Absorber, 42 Body portion, 43 Standing portion, 44 Back Sheet, 45 Top sheet, 46 Standing elastic member, 51 Front continuous body, 52 Back continuous body, 53 Leg hole, 56, 57 Application processing section, 56a, 57a Transfer roll, 56b, 57b Nip roll, 61 Fastening sheet continuous body , C1 fold line, F1-F4 transport direction.

Claims (5)

An opening for the waist;
Left and right leg openings,
An elastic member provided in a stretched state on the front or back located on the front or back side of the wearer;
Provided along the substantially vertical direction on the front part or the back part, and a breaking part for breaking the front part or the back part;
A fastening member provided for re-fastening when the front part or the back part is broken by the breaking part;
With
The elastic member is a method for producing a disposable absorbent article in which the cut end is cut so as to be separated from the fracture portion,
While conveying a continuous body in which the material for constituting the absorbent article is continuously continuous in the lateral direction with respect to the absorbent article as a reference, at least the front part and the back part of the continuous body An elastic member applying step of continuously applying the elastic member along the longitudinal direction to a portion corresponding to one;
An elastic member cutting step of cutting the elastic member such that a cut end of the elastic member is separated from the fracture portion;
A weakening treatment step of carrying out a weakening treatment on the elastic member applied to a joining region to which the fastening member in the continuous body is joined;
A fastening member application step of joining the fastening member to the continuous body after the weakening treatment;
A fracture portion forming step of providing the fracture portion in a portion corresponding to any one of the front portion and the back portion in the continuous body;
A product dividing step of dividing the continuum into product units;
A method for producing a disposable absorbent article, comprising: It is a manufacturing method of the disposable absorbent article according to claim 1,
In the elastic member application step, the elastic member is continuously applied to the continuum while applying an adhesive for joining the elastic member and the continuum to the elastic member or the continuum.
In the elastic member cutting step, before the adhesive applied in the elastic member applying step is cured, the elastic member is cut at or near the position where the rupture portion is formed in the continuum. A method for producing a disposable absorbent article , wherein the member is contracted, and the cut end of the elastic member is retracted away from the position where the fracture portion is formed in accordance with the contraction . It is a manufacturing method of the disposable absorbent article according to claim 1 or 2 ,
The said elastic member cutting process is performed before the said weakening process process , The manufacturing method of the disposable absorbent article characterized by the above-mentioned . It is a manufacturing method of the disposable absorbent article according to claim 3,
  The said weakening process process WHEREIN: The said weakening process is performed with respect to the said elastic member in the both sides of the said longitudinal direction of the cutting | disconnection location of the said elastic member cut | disconnected in the said elastic member cutting process in the said continuous body, The disposable Manufacturing method of absorbent article. A method for producing a disposable absorbent article according to any one of claims 1 to 4,
  The said elastic member cutting process is performed before the said fracture | rupture part formation process, The manufacturing method of the disposable absorbent article characterized by the above-mentioned.

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