TWI499406B - A method of manufacturing an absorbent article, and an extension device - Google Patents

Description

Absorbent article manufacturing method and extension device

The present invention relates to a method for producing an absorbent article and an extension device for use in a method of producing an absorbent article. The absorbent article includes at least a composite sheet obtained by laminating a plurality of sheets by an adhesive, and an absorbent body attached to the composite sheet.

An absorbent article such as a sanitary napkin or a disposable diaper includes a liquid-permeable liquid-permeable surface sheet, a liquid-impermeable back sheet which is impermeable to liquid, and an absorbent body provided between the surface sheet and the back sheet. The back sheet includes an underlayer film, a bottom layer non-woven fabric provided on the outer side of the underlayer film, and the like.

The back sheet is a non-elastic body, and if it is not treated, the touch is not good, and therefore the back sheet is subjected to a treatment for improving softness and touch. For example, a gear extension method has been disclosed (refer to Patent Document 1).

The gear extension method is a method in which a back sheet is passed between one of the pair of gear tooth portions that are in mesh with each other, and a concavity and convexity in the thickness direction is formed on the back sheet. Thereby, the back sheet is deformed along the shape of the gear tooth portion. Therefore, the back sheet can be extended in the width direction. Further, as a result of extending the back sheet in the width direction, the thickness of the back sheet is reduced, so that the rigidity of the back sheet can be reduced.

However, since the underlayer film and the underlayer non-woven fabric are bonded by the adhesive material, the degree of elongation between the portion coated with the adhesive material and the portion where the adhesive material is not applied is greatly different. In view of this, a method of heating the back sheet when the back sheet is bitten by the gear teeth is known by heating the gear teeth. According to this method, the adhesive material can be softened and easily conformed to the unevenness of the tooth portion of the gear to reduce the difference in the degree of extension of the portion where the adhesive material is applied and the portion where the adhesive material is not applied.

[Patent Document 1] Japanese Laid-Open Patent Publication No. 2002-316359 (page 5)

However, the above conventional gear extension method has the following problems. That is, in the short period in which the back sheet passes through one of the pair of gear teeth, the adhesive must be softened, and the temperature of the gear teeth must be raised as much as possible or the conveyance speed can be lowered.

In the gear extension method, the basis weight of the underlying nonwoven fabric is reduced by causing the gear tooth portion to bite into the back sheet, and if the heat transfer is insufficient, it is easy to cause unevenness in the back sheet and perforation (pinhole). Further, if the temperature of the gear tooth portion is too high, the fibers of the underlying nonwoven fabric are thermally fused and hardened, which causes a problem that the touch is deteriorated.

Accordingly, an object of the present invention is to provide a method for producing an absorbent article which can be formed by laminating a plurality of sheets bonded together by an adhesive material so as to uniformly extend in the width direction without causing damage and provide absorption. An extension device used in the method of manufacturing a sexual article.

In order to solve the above problems, the present invention has the following features. First, in the method for producing an absorbent article according to the first aspect of the present invention, the absorbent article comprises at least a plurality of sheets (for example, the base film 20A and the underlayer nonwoven fabric 20B) which are laminated by an adhesive sheet (back sheet) 20) and an absorber (absorbent body 30) attached to the composite sheet; the manufacturing method has a step A and a step B; the step A is performed by rotating along the conveying direction (machine direction MD) of the composite sheet The heating roller (heating roller 510) heats the sheet heated by the composite sheet conveyed in the conveyance direction to step S20; this step B is to form a plurality of convex portions (protrusions 532 and convex portions 542) on the outer circumference. And a molding roll mechanism (molding roll mechanism 520) in which one of the other convex portions is fitted between the one of the convex portions via the composite sheet, and the composite sheet is oriented in a direction orthogonal to the conveyance direction ( Cross-direction CD) extended sheet extending step S30; in the foregoing step A, the composite sheet is higher than the softening point of the adhesive and lower than the softening temperature of the plurality of sheets Low temperature heating; in the step B, and is a plurality of the convex portions, and is heated to the softening point of lower than the aforementioned high temperatures than the adhesive material 40.

According to the features of the present invention, there can be provided a method for producing an absorbent article, which can laminate a plurality of sheets by a bonding material, and uniformly extend in a width direction without causing damage, and provide an absorbent article. The extension device used in the manufacturing method.

Hereinafter, a method of manufacturing an absorbent article and an extension device according to the present embodiment will be described with reference to the drawings. In the description of the following drawings, the same or similar symbols are given to the same or similar parts. It should be noted, however, that the drawings are schematic, and the ratios of the dimensions are different from those of real objects.

Therefore, the specific dimensions and the like should be judged by considering the following instructions. In addition, the drawings will contain parts of different sizes and proportions from each other.

First, the structure of the absorbent article 1 manufactured by the method for producing an absorbent article of the present embodiment will be described with reference to the drawings. Fig. 1 is a plan view showing the absorbent article 1 of the present embodiment. Fig. 2 is a cross-sectional view showing the absorbent article 1 of the present embodiment (A-A cross-sectional view of Fig. 1). Fig. 3 is a cross-sectional view showing the absorbent article 1 of the present embodiment (B-B cross-sectional view of Fig. 1). Further, in the present embodiment, the absorbent article 1 is an unfolded disposable diaper.

As shown in the first to third figures, the absorbent article 1 has a vertically long shape from the periphery of the wearer's front chin (abdominal side) toward the circumference of the chin (back side) (hereinafter referred to as the longitudinal direction L).

The absorbent article 1 has, in the longitudinal direction L, a peripheral surrounding area S1 corresponding to the front sac of the wearer, a peripheral surrounding area S2 corresponding to the wearer's posterior condyle, and a kneeling position corresponding to the wearer. The underarm region S3 between the front sulcus surrounding area S1 and the posterior condyle surrounding area S2.

In the width direction W orthogonal to the longitudinal direction L, the absorbent article 1 has a central portion C1 including an absorbent body 30 to be described later, and a side portion on the outer side of the central region C1 in the width direction W. Area C2.

Such an absorbent article 1 includes a surface sheet 10, a back sheet 20, and an absorber 30. Further, the absorbent article 1 is provided with a waist flap portion 40 and a side flap portion 50.

The surface sheet 10 is disposed on one side that contacts the wearer's skin. The surface sheet 10 is disposed to cover the absorber 30. The surface sheet 10 is formed of a liquid-permeable sheet such as a hydrophilic nonwoven fabric or a woven fabric, an open plastic film, or an open hydrophobic nonwoven fabric.

The back sheet 20 is provided on the outer side of the absorbent article 1 when worn. The back sheet 20 is formed of a sheet-like underlayer film 20A which is impermeable to liquid (for example, polyethylene) and a sheet-like underlayer nonwoven fabric 20B which is provided outside the underlayer film 20A. The back sheet 20 is composed of a composite sheet in which a plurality of sheets are bonded together by an adhesive. Further, the back sheet 20 will be described in detail later.

The absorber 30 is disposed between the surface sheet 10 and the back sheet 20. The absorbent body 30 can absorb the body fluid of the wearer. The absorber 30 is a mixed material 30A including a pulverized pulp or a superabsorbent polymer, and a covering material 30B such as a tissue coated with the mixed powder 30A.

The waist flap portion 40 is provided in the front side peripheral region S1 and the posterior condyle surrounding region S2 in the longitudinal direction L. The waist flap portion 40 has a front flap portion 40A located in a pair of the front rake peripheral region S1 and a rear flap portion 40B located in a pair of the rear rake peripheral region S2.

The front side flap portion 40A is formed by extending the side sheet 60 attached to the back sheet 20 toward the outside in the width direction W. Further, instead of the side sheet 60, the bottom sheet nonwoven fabric 20B may be extended to form the front side flap portion 40A.

Similarly to the front flap portion 40A, the rear flap portion 40B is formed by extending the side sheet 60 outward in the width direction W. Similarly to the front flap portion 40A, instead of the side sheet 60, the bottom sheet nonwoven fabric 20B may be extended to form the rear flap portion 40B. A locking portion 41 for locking the region around the front sill S1 is provided on the surface on the side where the absorber 30 of the rear flap portion 40B is provided.

The locking portion 41 is formed, for example, by a fastening tape. In this case, the fastening tape becomes a male member, and the female member (the engaged portion) is provided in the region where the locking portion 41 of the front sill surrounding area S1 is locked. Further, the front sill surrounding area S1 is composed of a non-woven fabric, and the front sill surrounding area S1 itself may function as a locked portion.

The side flap portion 50 is provided along the longitudinal direction L outside the width direction W of the absorber 30. The side flap portion 50 is provided with a strip-shaped body 51 made of a rubber (for example, polyurethane) having elasticity in the longitudinal direction L. The strip 51 is joined to the back sheet 20 in a state of being elongated in the longitudinal direction L. The strip 51 includes the first strip 51A, the second strip 51B, the third strip 51C, and the fourth strip 51D from the inside in the width direction W toward the outside.

Next, the structure of the back sheet 20 described above will be described with reference to the drawings. Fig. 4(a) is a plan view showing the back sheet 20 of the embodiment. Fig. 4(b) is an enlarged cross-sectional view showing the back sheet 20 of the present embodiment (A-A cross-sectional view of Fig. 4(a)).

As shown in Fig. 4(a), the back sheet 20 has an extended portion 21 and an unextended portion 22. The extending portion 21 is a region formed by pressing the back sheet 20 in the thickness direction T of the back sheet 20. That is, the extension portion 21 has a basis weight (mass per unit area) smaller than that of the unextended portion 22 by performing the stretching process.

As shown in FIG. 4(b), the extending portion 21 is formed by alternately forming a thick portion 21L having a large amount of extension and a dense portion 21T having a smaller expansion amount than the thick portion 21L. The thick portion 21L and the dense portion 21T are continuous in the longitudinal direction L and are disposed in a plurality of states in the width direction W.

The extending portion 21 has a central extending portion 21A located at the central portion C1 and an end extending portion 21B at a portion of the side portion C2. Further, a part of the side portion region C2 of the present embodiment means a crotch region S3 excluding the edge portion region C3 (including the edge portion 20E located outside the width direction W).

Here, the end extension portion 21B does not have to be provided in a part of the side region C2. It may be provided in the entire area of the side area C2, and may not be provided in the underarm area S3 as shown in FIG. Further, the central extending portion 21A does not have to be provided in the entire area of the central portion C1, and may be provided in at least a part of the central portion C1. For example, as shown in FIG. 5, it is provided in addition to the edge portion C4 (including the outer side in the longitudinal direction L). The central area C1 other than the edge portion 20E) may also be used.

It is preferable that such an extending portion 21 expands the back sheet 20 by 3.0 times or less with respect to the back sheet 20 before the stretching process. Further, the extending portion 21 is joined to the absorber 30 in a flat state by being widened in the width direction W (see FIG. 6).

The unextended portion 22 is a region where the back sheet 20 is not pressed in the thickness direction T. That is, the unextended portion 22 is a region other than the extending portion 21 of the back sheet 20. The unextended portion 22 is provided in a pair of side regions C2.

Next, a method of manufacturing the absorbent article for producing the absorbent article 1 will be described with reference to the drawings. Fig. 6 is an explanatory view showing a method of manufacturing the absorbent article of the embodiment.

As shown in Fig. 6, the method for producing an absorbent article is for producing an absorbent article 1 having at least a back sheet 20 and an absorbent body 30. Specifically, the method for producing an absorbent article includes a sheet bonding step S10, a sheet heating step S20, a sheet extending step S30, a sheet widening step S40, an absorber joining step S50, a strip-like disposing step S60, and a side flap. Step S70, a waist flap arrangement step S80, and a product cutting step S90 are formed.

In the sheet bonding step S10, the non-woven sheet 120B in which the underlying sheet 120A and the underlying non-woven fabric 20B which are successively formed by the underlayer film 20A are continuously formed by using an adhesive (for example, hot melt adhesive), along the conveyance direction (hereinafter referred to as The machine direction MD) is conveyed and bonded to each other to form a composite sheet 120.

In the sheet heating step S20, the composite sheet 120 is heated by a heating roller 510 which will be described later. At this time, the composite sheet 120 is heated at a temperature lower than the softening point of the adhesive and lower than the softening temperature of the plurality of sheets (for example, the underlying film 20A). More preferably, the composite sheet 120 is heated at a temperature at least 20 degrees lower than the lowest softening temperature of the softening temperatures of the plurality of sheets.

In the sheet extending step S30, the heated composite sheet 120 is pressed toward the thickness direction T of the composite sheet 120 by a molding roll mechanism 520 which will be described later. Thereby, the composite sheet 120 is extended toward the width direction W of the composite sheet 120 (that is, the crossing direction CD orthogonal to the machine direction MD) to form the extended portion 21 and the unextended portion 22 in the composite sheet 120. At this time, the convex portion (the convex portion 532 and the convex portion 542) of the press roller mechanism 520 to be described later is heated at a temperature higher than 40 degrees and lower than the softening point of the adhesive.

In the sheet width step S40, the stretched composite sheet 120 is widened (expanded) toward the outer side in the width direction W of the composite sheet 120 by a widening roll mechanism 600 to be described later.

In the absorber joining step S50, the absorber 30 to which the surface sheet 10 is bonded is joined (mounted) on the widened composite sheet 120.

In the strip arrangement step S60, the strip 51 is placed on the composite sheet 120 in the width direction W of the absorber 30 in a state in which the strip 51 is extended in the machine direction MD of the composite sheet 120. on.

In the side panel forming step S70, the nonwoven fabric sheet 120B extending outward in the width direction W from the base sheet 120A is folded back toward the inside in the width direction W, and the strip sheet 51 is wrapped by the nonwoven sheet 120B to form the side panel portion 50.

In the waist flap arrangement step S80, the front side flap portion 40A formed in advance and the side flap portion 40B after the locking portion 41 is attached are joined to the composite sheet 120.

In the product cutting step S90, the composite sheet 120 provided with the absorber 30, the side panel portion 50, and the waist panel portion 40 is cut into a single product in the width direction W to produce the absorbent article 1.

Next, the structure of the extension device 500 used in the sheet heating step S20 and the sheet extending step S30 will be described with reference to the drawings. Fig. 7(a) is an enlarged perspective view showing a part of the extension device 500 of the present embodiment. Fig. 7(b) is an axial sectional view of the molding roll mechanism 520 of the present embodiment.

As shown in Fig. 7(a), the stretching device 500 extends in the intersecting direction CD while conveying the composite sheet 120 (which is bonded by the back sheet 120A and the nonwoven sheet 120B) in the machine direction MD. Further, in the present embodiment, the composite sheet 120 is joined by an adhesive material coated in a spiral pattern. The extension device 500 is provided with a heating roller 510 and a molding roller mechanism 520.

The heating roller 510 is disposed on the upstream side of the molding roller mechanism 520 closer to the machine direction MD. The heating roller 510 heats the composite sheet 120 before the composite sheet 120 passes the molding roll mechanism 520 while rotating in the machine direction MD.

The heating roller 510 is set to a predetermined temperature. Specifically, the heating roller 510 has a first heating portion (not shown) which can make the composite sheet 120 have a softening temperature higher than the softening point of the adhesive and lower than the softening temperature (so-called melting point) of the plurality of sheets. (for example, the underlayer film 20A) is heated at a lower temperature.

The embossing roller mechanism 520 heats the composite sheet 120 passing through the heating roller 510 and presses the composite sheet 120 toward the thickness direction T of the composite sheet 120. The molding roller mechanism 520 is set to a predetermined temperature. Specifically, the embossing roller mechanism 520 has a second heating portion (not shown) which can be higher than 40 degrees and lower than the softening point of the adhesive material by a plurality of convex portions (the convex portion 532 and the convex portion 542) which will be described later. The temperature is heated.

As shown in FIG. 7(b), the embossing roller mechanism 520 has a plurality of convex portions (so-called extension knives) formed on the outer circumference, and the other convex portion 542 is fitted between the one convex portions 532 via the composite sheet 120. One of the pair of roller mechanisms.

The shape of the convex portion 532 and the convex portion 542 is tapered from the outer circumference toward the outer side of the roller mechanism in the cross section in the axial direction of the roller mechanism. In the present embodiment, the shape of the convex portion 532 and the convex portion 542 is substantially triangular in cross section in the axial direction of the roller mechanism.

The convex portion 532 and the convex portion 542 are made of ferrite-based iron-based stainless steel (SUS430 2B). For example, the width t1 of the convex portion 532 and the width t2 of the convex portion 542 are each 0.7 to 1.0 mm. Further, it is preferable to perform a polishing process on the outer surfaces of the convex portion 532 and the convex portion 542.

In such an extension device 500, for example, the temperature of the heating roller 510 is 100 degrees. The temperature of the molding roll mechanism 520 is 60 degrees. The length (L) in the direction orthogonal to the axial direction of the roller mechanism when the convex portion 532 and the convex portion 542 are fitted is 1.6 mm. The interval (p1) between the plurality of convex portions 532 and the interval (p2) of the plurality of convex portions 542 are 2.5 mm. According to this condition, the stretching device 500 can perform a 1.3-fold expansion process on the composite sheet 120 with respect to the composite sheet 120 before the stretching process.

Further, in the stretching device 500, the magnification (stretching magnification) of the composite sheet 120 extending in the width direction W can be changed by appropriately changing the above respective conditions. Further, the heights of the convex portions 532 or the convex portions 542 may be different depending on the central portion C1 and the side portion C2 of the composite sheet 120. Thereby, the stretching ratio of the central region C1 and the stretching ratio of the side region C2 can be changed.

Next, the structure of the widening roller mechanism 600 used in the above-described sheet widening step S40 will be described with reference to the drawings. Fig. 8 is a perspective view showing the widening roller mechanism 600 of the present embodiment.

As shown in Fig. 8, the widening roller mechanism 600 is formed by widening the outer side of the composite sheet 120 in the direction perpendicular to the cross direction CD of the composite sheet 120 by the molding roll mechanism 520. As a result, the extending portion 21 (the thick portion 21L and the dense portion 21T) provided in the composite sheet 120 is flattened, and the extending portion 21 is widened. The widening roller mechanism 600 includes a first expansion roller mechanism 610 and a second expansion roller mechanism 620.

The first expansion roll mechanism 610 holds one side portion 120E _{1 of the} composite sheet 120. The first expansion roll mechanism 610 includes a first upper pressing roller 611 and a first lower pressing roller 612.

The first upper pressing roller 611 is disposed on one surface side (upper surface side) of the composite sheet 120. The first upper pressing roller 611 rotates in the feeding direction in which the composite sheet 120 is fed, centering on the axis core, in a state in which the upper surface of the composite sheet 120 is contacted.

The first lower pressing roller 612 is disposed on the opposite side (lower side) of the first upper pressing roller 611 via the composite sheet 120. The composite sheet 120 is held between the first lower pressing roller 612 and the first upper pressing roller 611. The first lower pressing roller 612 rotates in the feeding direction in which the composite sheet 120 is fed, centering on the core, in a state in which it is in contact with the lower surface of the composite sheet 120.

The first upper pressing roller 611 and the first lower pressing roller 612, the center line CL side of the composite sheet 120 is positioned on the front side in the machine direction MD. In other words, the first upper pressing roller 611 and the first lower pressing roller 612 are inclined with respect to the intersecting direction CD in a plan view of the composite sheet 120. Thereby, the first upper pressing roller 611 and the first lower pressing roller 612 can widen the composite sheet 120 into a flat shape.

The second expansion roll mechanism 620 holds the other side portion 120E _{2 of the} composite sheet 120. The second expansion roll mechanism 620 includes a second upper pressing roller 621 and a second lower pressing roller 622 . Further, the structure of the second expansion roll mechanism 620 is the same as that of the first expansion roll mechanism 610. Therefore, the description of the second expansion roll mechanism 620 is omitted.

In the widening roller mechanism 600, the inclination angle of the first upper pressing roller 611 and the first lower pressing roller 612 with respect to the intersecting direction CD, the second upper pressing roller 621, and the second lower pressing roller are appropriately changed. The degree of widening of the composite sheet 120 can be varied by the angle of inclination of the 622 with respect to the cross direction CD.

(comparative evaluation)

Next, in order to clarify the effects of the present invention, comparative evaluations were carried out using the following comparative examples and extension devices of the examples. Further, the present invention is not limited to the examples.

The relevant data of the conditions for each sheet, adhesive, and extension device used for comparative evaluation are shown in Tables 1 to 3. The adhesive materials used for comparative evaluation were also produced by the following methods.

First, a part of a stabilizer such as a plasticizer or an adhesion-imparting agent (for example, a tackifier) is placed in a container having an internal temperature of 140 to 160 degrees. Next, a matrix polymer (thermoplastic polymer) such as SBS (styrene-butadiene-styrene) is introduced into the container, and the mixture is stirred under reduced pressure.

Next, a stabilizer such as a remaining plasticizer or an adhesion-imparting agent is introduced into the container, and the mixture is stirred by stirring under reduced pressure. Next, the mixed adhesive is taken out and packaged. The composition of the adhesive thus produced is shown in Table 1.

Using the extension devices of Comparative Examples 1 to 10 and Examples 1 to 8, the composite sheet 120 was stretched, and the probability of occurrence of perforation (pinhole) in the composite sheet 120 extended by each stretching device was measured. .

As a result, as shown in Tables 2 and 3, the perforation ratios of the stretching apparatuses of Examples 1 to 8 were lowered as compared with the stretching apparatuses of Comparative Examples 1 to 10. That is, in the stretching apparatuses of Examples 1 to 8, the composite sheet 120 was heated at a temperature higher than the softening point (about 82 ° C) of the adhesive and lower than the softening temperature (about 120 ° C) of the composite sheet 120. Further, in the stretching devices of Examples 1 to 8, the plurality of convex portions are heated at a temperature higher than 40 degrees and lower than a softening point (about 82 ° C) of the adhesive. Therefore, the perforation rate of the extension devices of Examples 1 to 8 was lowered.

According to the embodiment described above, the composite sheet 120 is heated before being pressed. At this time, the composite sheet 120 is heated at a temperature lower than the softening point of the adhesive and lower than the softening temperature (for example, the underlying film 20A) of the softening temperatures of the plurality of sheets. Thereby, the adhesive material between the plurality of sheets can be softened before the composite sheet 120 is pressed by the molding roll mechanism 520.

Further, when the composite sheet 120 is heated at a temperature lower than the softening point of the adhesive, the adhesive between the plurality of sheets cannot be softened. Further, in the case where the composite sheet 120 is heated at a temperature higher than the softening temperature (e.g., the underlying film 20A) of the plurality of sheets (the underlayer film 20A and the underlayer non-woven fabric 20B), the underlayer film 20A is thermally fused. The hardening causes the touch to deteriorate, and a plurality of sheets may be damaged.

Further, the composite sheet 120 to be heated is pressed in the thickness direction T to extend in the width direction W. At this time, the convex portion 532 and the convex portion 542 are heated at a temperature higher than 40 degrees and lower than the softening point of the adhesive. In this manner, the composite sheet 120 is pressed while the adhesive material between the plurality of sheets is soft and the composite sheet 120 is heated. Therefore, the adhesive material between the plurality of sheets easily conforms to the convex portion 532 and the convex portion 542. Therefore, the composite sheet 120 can be sufficiently thermally transferred without causing unevenness in basis weight in the composite sheet 120, and the occurrence of perforation (pinhole) can be surely suppressed.

Further, in the case where the convex portion is heated at a temperature lower than 40 degrees, the adhesive material between the softened composite sheets 120 oozes out from the plurality of sheets when passing through the press roll mechanism 520, and is easily attached to the convex portion. surface. The adhesive attached to the surface of the convex portion is further adhered to the composite sheet 120. If the adhesive is adhered to the composite sheet 120, manufacturing defects such as perforation may occur.

Further, in the case where the convex portion is heated at a temperature higher than the softening point of the adhesive material, the fitting portion of the convex portion 532 and the convex portion 542 is extended, and the fitting portion is damaged, so that it is easy to occur in the composite sheet 120. Uneven basis weight, perforation (pinhole).

According to the method for producing an absorbent article and the stretching device 500 of the present embodiment, the composite sheet 120 in which a plurality of sheets are bonded together by an adhesive material can be uniformly extended in the width direction W without causing damage. .

In the present embodiment, the composite sheet 120 is heated at a temperature lower than the lowest softening temperature among the softening temperatures of the plurality of sheets by at least 20 degrees. If the composite sheet 120 is heated at a temperature higher than the aforementioned temperature (i.e., a temperature at least 20 degrees below the lowest softening temperature among the softening temperatures of the plurality of sheets), a portion of the composite sheet 120 may be thermally fused. Have a hard time.

In the present embodiment, the composite sheet 120 is joined by an adhesive material coated in a spiral pattern. In the spiral pattern, the adhesive material is sprayed onto the composite sheet 120 in a mist form, and is applied in a fine and high-density linear shape. Therefore, when the composite sheet 120 is subjected to the stretching process, the extension of the composite sheet 120 is less likely to be deviated, and perforation (pinhole) is less likely to occur.

(Other embodiments)

The above description of the present invention is made by the embodiment of the present invention, but it is understood that the description and drawings which form a part of this disclosure are not intended to limit the invention. Various alternative embodiments, examples, and operational techniques will be apparent to those of ordinary skill in the art in the art.

For example, the embodiment of the present invention can be modified as follows. Specifically, although the composite sheet 120 is used for explaining the back sheet 20, the present invention is not limited thereto, and may be used as a member (for example, a surface sheet) composed of a plurality of sheets. A member of various absorbent articles such as a paper trousers cloth and a sanitary napkin.

Further, the shape of the convex portion (the convex portion 532 and the convex portion 542) is tapered (substantially triangular) in the cross section in the axial direction, but the shape is not limited thereto, and may be a quadrangular shape. Trapezoidal, arc-shaped, etc.

In addition, in the sheet bonding step S10, the nonwoven fabric sheet 120B in which the underlying sheet 120A and the underlying nonwoven fabric 20B which are successively formed by the underlayer film 20A are bonded together is not limited thereto, and the underlayer film is used. 20A may be attached to the non-woven sheet 120B intermittently.

In addition, although the sheet bonding step S10 to the product cutting step S90 are described, the method of manufacturing the absorbent article is not limited thereto, and at least the sheet heating step S20, the sheet extending step S30, and the absorbent joining step S50 are provided. Yes, of course, it can be set as appropriate according to the purpose.

As such, the present invention naturally includes various embodiments and the like which are not described herein. Therefore, the technical scope of the present invention is defined by the definition of the invention according to the scope of the above-mentioned application.

1. . . Absorbent article

10. . . Surface sheet

20. . . Back sheet

20A. . . Bottom film

20B. . . Underlayer non-woven

20E. . . Edge part

twenty one. . . Extension

21A. . . Central extension

21B. . . End extension

21L. . . Rough

21T. . . Secret department

twenty two. . . Unextended part

30. . . Absorber

30A. . . Mixed powder

30B. . . Covering material

40. . . Waist flap

40A. . . Front side flap

40B. . . Rear wing

41. . . Clamping part

50. . . Side flap

51 (51A~51D). . . Band

60. . . Side sheet

120. . . Composite sheet

120A. . . Underlying sheet

120B. . . Non-woven sheet

120E ₁ , 120E ₂ . . . Side

500. . . Extension device

510. . . Heating roller

520. . . Molding roller mechanism

532, 542. . . Convex

600. . . Widening roller mechanism

610. . . First widening roller mechanism

611. . . First upper pressing roller

612. . . First lower pressing roller

620. . . Second widening roller mechanism

621. . . Second upper pressing roller

622. . . Second lower pressing roller

Fig. 1 is a plan view showing the absorbent article 1 of the present embodiment.

Fig. 2 is a cross-sectional view showing the absorbent article 1 of the present embodiment (A-A cross-sectional view of Fig. 1).

Fig. 3 is a cross-sectional view showing the absorbent article 1 of the present embodiment (B-B cross-sectional view of Fig. 1).

Fig. 4(a) is a plan view (1) of the back sheet 20 of the present embodiment. Fig. 4(b) is an enlarged cross-sectional view showing the back sheet 20 of the present embodiment (A-A cross-sectional view of Fig. 4(a)).

Fig. 5 is a plan view (2) of the back sheet 20 of the present embodiment.

Fig. 6 is an explanatory view showing a method of manufacturing the absorbent article of the embodiment.

Fig. 7(a) is an enlarged perspective view showing a part of the extension device 500 of the present embodiment. Fig. 7(b) is an axial sectional view of the molding roll mechanism 520 of the present embodiment.

Fig. 8 is a perspective view showing the widening roller mechanism 600 of the present embodiment.

20. . . Back sheet

20E. . . Edge part

twenty one. . . Extension

21A. . . Central extension

21B. . . End extension

twenty two. . . Unextended part

30. . . Absorber

S1. . . Area around the front

S2. . . Surrounding area

S3. . . Underarm area

C1. . . Central area

C2. . . Side area

C3. . . Edge area

C4. . . Edge area

Claims (5)

A method for producing an absorbent article comprising: at least a composite sheet in which a plurality of sheets are bonded together by an adhesive, and an absorbent body attached to the composite sheet; and the manufacturing method has the steps A and B In the step A, the composite sheet conveyed along the conveying direction is heated by a heating roller that rotates in the conveying direction of the composite sheet; and the step B is to form a plurality of convex portions on the outer circumference and partition. The embossing roller mechanism in which the composite sheet is fitted to one of the other convex portions between the one of the convex portions, and the composite sheet is extended in a direction orthogonal to the conveyance direction; in the step A, The composite sheet is heated at a temperature higher than a softening point of the adhesive material and lower than a softening temperature of a softening temperature of the plurality of sheets; in the step B, the plurality of convex portions are compared with 40 The temperature is high and the temperature is lower than the softening point of the aforementioned adhesive. The method for producing an absorbent article according to claim 1, wherein in the step A, the composite sheet is at least 20 degrees lower than a softening temperature of a softening temperature of the plurality of sheets. Heat up. The method for producing an absorbent article according to the first aspect of the invention, wherein the composite sheet is joined by the adhesive material coated in a spiral pattern. The method for producing an absorbent article according to any one of the first to third aspects of the present invention, wherein, after the step B, the step of providing at least one of the side portions in the width direction of the composite sheet The step of widening the roller mechanism and widening the composite sheet toward the outer side in the width direction of the composite sheet into a flat shape. An extension device is a composite sheet obtained by laminating a plurality of sheets by an adhesive material, and is conveyed along a conveying direction of the composite sheet and extending in a crossing direction orthogonal to the conveying direction; the extending device has: along a heating roller that rotates the conveyance direction of the composite sheet and heats the composite sheet, and a plurality of convex portions are formed on the outer circumference, and one of the convex portions is fitted between the one of the convex portions via the composite sheet The pressure roller mechanism; the heating roller has a first heating portion that heats the composite sheet at a temperature higher than a softening point of the adhesive material and lower than a softening temperature of a softening temperature of the plurality of sheets; The pressure roller mechanism includes a second heating unit that heats the plurality of convex portions at a temperature higher than 40 degrees and lower than a softening point of the adhesive.