Manufacturing method and manufacturing device of composite stretchable member

Abstract

To enable formation of a non-elastic region by eliminating or reducing elastic stretchability in a predetermined portion of a composite sheet arranged with an elastic member, while suppressing occurrence of hole opening or breaking of the composite sheet even when variation of processing conditions or material unevenness occurs.SOLUTION: A manufacturing method of a composite stretchable member 10 includes a step of, while conveying a composite sheet 10A in which a plurality of elastic members 13 are arranged between sheets 11 and 12, along an extension direction of the elastic members 13, compressing the composite sheet 10A between a first roll 5 and a second roll 6 including a plurality of projections 4P, thereby cutting the elastic member 13 and forming a non-elastic region 15 in the composite sheet 10A, and forming a front hole opening suppression region 16 for suppressing hole opening in the composite sheet 10A, in a boundary portion between the non-elastic region 15 and an elastic region 14 adjacent to the non-elastic region 15 on a downstream side in a conveyance direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method and an apparatus for manufacturing a composite elastic member. [Background technology]

[0002] Conventionally, absorbent articles such as disposable diapers have used composite stretchable members that are stretchable in a predetermined direction to improve the fit of specific areas, such as the waist and torso, to the wearer, and a known composite stretchable member is one in which a plurality of thread-like or strip-like elastic members are arranged in a stretched state on a non-stretch sheet that is inherently non-stretchable, such as a nonwoven fabric or plastic film. Furthermore, composite stretchable members are not limited to those in which the entire sheet is stretchable, but also to those in which stretchability is imparted only to necessary areas and which have inelastic regions that do not have stretchability.

[0003] For example, Patent Document 1 describes a method for manufacturing a composite stretchable member having inelastic regions, in which a composite sheet having a plurality of elastic members arranged in a stretched state between a first roll having a large number of convex portions arranged on its surface and a second roll facing the first roll is passed, and the elastic members of the composite sheet are cut by applying pressure between the convex portions of the first roll and the second roll and by heating with both rolls. Patent Document 1 relates to an improved technology for a pants-type disposable diaper which includes an outer shell and an absorbent main body which is arranged in the center of the skin-facing side of the outer shell and includes a liquid-retaining absorbent core, and the composite stretchable member is used in the outer shell of the diaper. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-273808 Summary of the Invention [Problem to be solved by the invention]

[0005] In a method for manufacturing a composite elastic member having inelastic regions, it is preferable to be able to cut the elastic members disposed on the composite sheet without damaging the composite sheet. However, in the conventional manufacturing method of a composite elastic member having an inelastic region, holes may occur in the composite sheet. The manufacturing method of a composite elastic member having an inelastic region described in Patent Document 1 also leaves room for improvement in the problem of holes occurring in the composite sheet due to variations in processing conditions, unevenness in the material, etc. Furthermore, if the breaking strength of the sheet is reduced by reducing the basis weight of the material, the hole formation may worsen.

[0006] Therefore, the object of the present invention is to form inelastic regions by eliminating or reducing the elastic stretchability at specific locations of a composite sheet in which an elastic member is arranged, while suppressing the occurrence of holes or cuts in the composite sheet even when fluctuations in processing conditions or unevenness in materials occur. [Means for solving the problem]

[0007] The present invention relates to a method for producing a composite elastic member in which elastic regions that exhibit elastic stretchability and inelastic regions that do not exhibit substantial elastic stretchability are alternately formed in one direction. In one embodiment, the method preferably includes a step of conveying a composite sheet having a plurality of sheets and a plurality of elastic members arranged between the sheets along the extension direction of the elastic members, while pressing the composite sheet between a first roll having a plurality of protrusions and a second roll, thereby cutting the elastic members and forming the non-elastic region in the composite sheet, and forming a hole prevention region at the boundary between the non-elastic region and an elastic region adjacent to the non-elastic region downstream in the conveying direction to prevent holes from being formed in the composite sheet. In one embodiment, the first roll has a pressure section with multiple protrusions on a portion of its peripheral surface in the circumferential direction, and the pressure section has a cutting area in which multiple first protrusions are formed to form the inelastic area, and a pre-pressure area located in front of the cutting area in the rotation direction of the first roll and in which multiple second protrusions are formed to pressurize the composite sheet, and it is preferable that the front edge of the second protrusions in the rotation direction has a convex curved shape toward the rotation direction.

[0008] The present invention also relates to a method for producing a composite elastic member in which elastic regions that exhibit elastic stretchability and inelastic regions that do not substantially exhibit elastic stretchability are alternately formed in the conveying direction. In one embodiment, the method preferably includes a step of conveying a composite sheet having a plurality of sheets and a plurality of elastic members arranged between the sheets along the extension direction of the elastic members, while pressing the composite sheet between a first roll and a second roll having a plurality of protrusions, thereby cutting the elastic members and forming the non-elastic region in the composite sheet, and forming a front hole-prevention region at the boundary between the non-elastic region and an elastic region adjacent to the non-elastic region downstream in the conveying direction to prevent holes from being formed in the composite sheet. In one embodiment, the first roll has a pressure section with multiple protrusions on a portion of its peripheral surface in the circumferential direction, and the pressure section has a cutting area in which multiple first protrusions are formed to form the inelastic area, and a pre-pressure area located in front of the cutting area in the rotation direction of the first roll and in which multiple second protrusions are formed to pressurize the composite sheet, and it is preferable that the front edges of the first protrusions and the second protrusions in the rotation direction are straight lines along the rotation axis direction of the first roll, and the length of the edge of the second protrusions is shorter than the length along the rotation axis direction of the front edges of the first protrusions.

[0009] The present invention further relates to a pant-type diaper comprising a composite elastic member produced by the above method.

[0010] Furthermore, the present invention relates to a manufacturing apparatus used to manufacture a composite elastic member in which elastic regions that exhibit elastic stretchability and inelastic regions that do not substantially exhibit elastic stretchability are alternately formed in one direction. In one embodiment, a composite sheet having a plurality of sheets and a plurality of elastic members arranged between the sheets is conveyed along the extension direction of the elastic members, and the composite sheet is pressed between a first roll and a second roll having a plurality of protrusions, thereby cutting the elastic members and forming the non-elastic region in the composite sheet, and it is preferable that a pressure means is provided to form a front hole-prevention region at the boundary between the non-elastic region and the elastic region adjacent to the non-elastic region downstream in the conveying direction to prevent holes from being formed in the composite sheet. In one embodiment, the first roll has a pressure section with multiple protrusions on a portion of its peripheral surface in the circumferential direction, and the pressure section has a cutting area in which multiple first protrusions are formed to form the inelastic area, and a pre-pressure area located in front of the cutting area in the rotation direction of the first roll and in which multiple second protrusions are formed to pressurize the composite sheet, and it is preferable that the front edge of the second protrusions in the rotation direction has a convex curved shape toward the rotation direction.

[0011] The present invention also relates to a manufacturing apparatus used to manufacture a composite elastic member in which elastic regions that exhibit elastic stretchability and inelastic regions that do not substantially exhibit elastic stretchability are alternately formed in one direction. In one embodiment, a composite sheet having a plurality of sheets and a plurality of elastic members arranged between the sheets is conveyed along the extension direction of the elastic members, and the composite sheet is pressed between a first roll and a second roll having a plurality of protrusions, thereby cutting the elastic members and forming the non-elastic region in the composite sheet, and it is preferable that a pressure means is provided to form a front hole-prevention region at the boundary between the non-elastic region and the elastic region adjacent to the non-elastic region downstream in the conveying direction to prevent holes from being formed in the composite sheet. In one embodiment, the first roll has a pressure section with multiple protrusions on a portion of its peripheral surface in the circumferential direction, and the pressure section has a cutting area in which multiple first protrusions are formed to form the inelastic area, and a pre-pressure area located in front of the cutting area in the rotation direction of the first roll and in which multiple second protrusions are formed to pressurize the composite sheet, and it is preferable that the front edges of the first protrusions and the second protrusions in the rotation direction are straight lines along the rotation axis direction of the first roll, and the length of the edge of the second protrusion is shorter than the length along the rotation axis direction of the front edge of the first protrusions. [Effects of the Invention]

[0012] According to the present invention, even when variations in processing conditions or unevenness in materials occur, it is possible to form inelastic regions by eliminating or reducing the elastic stretchability at specific locations of the composite sheet where the elastic member is arranged, while suppressing the occurrence of holes in the composite sheet. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic perspective view of an embodiment of a method for producing a composite elastic member of the present invention using an embodiment of an apparatus for producing a composite elastic member of the present invention. [Figure 2] FIG. 2 is a schematic plan view of a pressure section of the first roll shown in FIG. [Figure 3] FIG. 3 is a schematic plan view of a composite elastic member manufactured by the manufacturing apparatus shown in FIG. [Figure 4] FIG. 4 is an enlarged plan view of the pressure unit shown in FIG. [Figure 5] FIG. 5 is an enlarged plan view of the pressure unit shown in FIG. [Figure 6] FIG. 6 is a view corresponding to FIG. 4, showing another embodiment of the pressure unit. [Figure 7] FIG. 7 is a partially cutaway perspective view schematically showing an example of a stretchable sheet. [Figure 8] FIG. 8 is a schematic plan view showing still another embodiment of the pressure unit. [Figure 9] FIG. 9 is a schematic plan view of a composite elastic member manufactured using the pressure unit shown in FIG. [Figure 10] FIG. 10 is an enlarged plan view of the pressure unit shown in FIG. [Figure 11] FIG. 11 is a schematic enlarged plan view showing still another embodiment of the pressure unit. [Figure 12] FIG. 12 is an explanatory diagram showing variations of composite sheets to be subjected to cutting processing by pressure. [Figure 13] FIG. 13 is a schematic perspective view of another embodiment of the method of manufacturing a composite elastic member of the present invention. [Figure 14] FIG. 14 is an enlarged plan view illustrating the positional relationship between the second convex portion and the elastic member. DETAILED DESCRIPTION OF THE INVENTION

[0014] Preferred embodiments of the present invention will now be described with reference to the drawings. The composite elastic member manufacturing apparatus 1 shown in Fig. 1 is a manufacturing apparatus used to implement a method for manufacturing a composite elastic member 10, which is one embodiment of the present invention. The method for manufacturing the composite elastic member 10 of this embodiment is a method for manufacturing a composite elastic member used in, for example, pants-type disposable diapers, and produces a composite elastic member 10 in which, as shown in Fig. 3, elastic regions 14 that exhibit elastic stretchability and inelastic regions 15 that do not substantially exhibit elastic stretchability are formed alternately in one direction. In the following description, the direction in which sheets 11 and 12 are conveyed is referred to as the MD (Machine Direction) direction, and the direction perpendicular to the MD direction is referred to as the CD (Cross Machine Direction) direction. Note that the extension direction of elastic members 13 (described later) coincides with the MD direction. Also, the rotation axis direction A (described later) coincides with the CD direction.

[0015] The composite elastic member manufacturing apparatus 1 shown in FIG. 1 preferably includes a composite sheet manufacturing means 2 and a pressure means 3.

[0016] The composite sheet manufacturing means 2 is disposed upstream in the MD direction from the pressure applying means 3, and is configured to include a conveying means (not shown) for the sheets 11 and 12, a conveying means (not shown) for the elastic member 13, an adhesive applying means (not shown) for applying adhesive to the sheet 11, and a pair of upper and lower nip rolls 23, 23 at which the constituent members 11, 12, and 13 of the composite sheet 10A join together. The configuration of the composite sheet manufacturing means 2 is basically the same as that in a manufacturing apparatus for this type of stretchable sheet (a sheet configured such that a plurality of elastic members are arranged in a stretched state on the sheet).

[0017] In the composite sheet manufacturing means 2, as shown in FIG. 1, a strip-shaped sheet 11 continuously supplied from a raw web roll (not shown) is conveyed in the MD direction in FIG. 1. An adhesive such as a hot melt adhesive is applied to one side of the sheet 11 (the side facing the sheet 12) by an adhesive applicator, and the adhesive-coated sheet 11 is conveyed between a pair of nip rolls 23, 23. A predetermined tension is applied to each of a plurality of thread-like elastic members 13 to elongate them to a predetermined elongation rate, and the plurality of elastic members 13 in this stretched state are conveyed between the pair of nip rolls 23, 23. Separately, a strip-shaped sheet 12 having the same length in the CD direction as the sheet 11 is conveyed between the pair of nip rolls 23, 23 from above the sheet 11. The CD direction is perpendicular to the MD direction and parallel to the rotation axes 51 and 61 of rolls 5 and 6, which will be described later. In this way, two strip-shaped sheets 11, 12 and a plurality of elastic members 13 in a stretched state are fed between a pair of nip rolls 23, 23, and pressure is applied between the rolls 23, 23, whereby the members 11, 12, 13 are pressed together via the adhesive, resulting in a composite sheet 10A having a plurality of sheets 11, 12 and a plurality of elastic members 13 arranged between the sheets 11, 12. The adhesive may be applied to the sheet 12, or to both the sheets 11 and 12, or to the plurality of elastic members 13. The elastic members 13 are arranged along the MD; in other words, the extending direction of the elastic members 13 coincides with the MD.

[0018] The pressurizing means 3 provided in the manufacturing apparatus 1 applies pressure to the composite sheet 10A manufactured using the composite sheet manufacturing means 2, thereby cutting the elastic members 13 to form inelastic regions 15 in the composite sheet 10A, and also forms a front hole-prevention region 16 for preventing holes from being formed in the composite sheet 10A at the boundary between the inelastic region 15 and the elastic region 14 adjacent to the inelastic region 15 on the downstream side in the MD direction. As shown in FIG. 1 , the pressurizing means 3 includes a first roll 5 having a plurality of protruding projections 4P provided on its circumferential surface, and a second roll 6 opposed to the first roll 5. The circumferential surface of the second roll 6 is smooth and does not have any irregularities. The first roll 5 is provided with a hydraulic or pneumatic pressure mechanism at its bearing portion, so that a desired pressure can be applied to the composite sheet 10A inserted between the two rolls 5 and 6.

[0019] The surfaces of the nip rolls 23, 23 are preferably made of a non-stick material or are treated to be non-stick, since the hot melt adhesive may penetrate the sheets 11, 12 and contaminate the roll surfaces, depending on the type of sheets 11, 12, etc.

[0020] 1, the pressure means 3 comprises a first roll 5 having a rotor 52 supported for rotation in a rotation direction R1 around a rotation axis 51, and a second roll 6 having a cylindrical rotor 62 that rotates in a direction R2 around a rotation axis 61 in synchronization with the roll 5, and when the rolls 5 and 6 are rotating, the elastic member 13 of the composite sheet 10A supplied between the rolls 5 and 6 is pressed by the pressure portion 4 of the roll 5 and the circumferential surface of the roll 6. The rolls 5 and 6 are arranged to rotate in synchronization by transmitting a driving force from a driving means (not shown) to the rotation axes 51 and 61 of the rolls 5 and 6.

[0021] Both rolls 5 and 6 are configured to include a rigid body made of metal such as various tool steels (iron and steel) such as die steel. In this embodiment, both rolls 5 and 6 are provided with a heating means (not shown) such as a heater inside, and heat is transferred to the composite sheet 10A passing between both rolls 5 and 6 by thermal conduction from the heating means. However, in the present invention, such a heating means is not essential, and neither of both rolls 5 and 6 may be provided with a heating means, or only one of them may be provided with a heating means.

[0022] The heating temperature of pressure section 4 of first roll 5 by the heating means is preferably 50°C or higher and 170°C or lower, more preferably 70°C or higher and 150°C or lower, from the viewpoint of improving the cuttability of elastic member 13 of composite sheet 10A supplied between both rolls 5 and 6 by pressure section 4 and from the viewpoint of preventing melting of composite sheet 10A. When nonwoven fabric is used as sheets 11 and 12, the upper limit of the heating temperature of pressure section 4 is preferably set to be equal to or lower than the melting point of the constituent material.

[0023] In the pressure applying means 3, as shown in FIG. 1, the strip-shaped composite sheet 10A obtained using the composite sheet manufacturing means 2 is passed between a first roll 5 rotating in a direction R1 and a second roll 6 rotating in a rotation direction R2, and the composite sheet 10A is pressed by the pressure applying portion 4 of the first roll 5 and the peripheral surface of the second roll 6, forming a front hole suppression region 16 and an inelastic region 15 in the composite sheet 10A, thereby obtaining the desired composite elastic member 10 (see FIG. 3).

[0024] To further explain the first roll 5, which is one of the main features of the present invention, as shown in FIG. 1, the first roll 5 has a pressure section 4 provided with a plurality of protruding portions 4P for pressing the elastic member 13 on a portion of its peripheral surface in the circumferential direction. More specifically, the first roll 5 has one or more (two in the illustrated embodiment) processed portions 53 formed on its peripheral surface and protruding in the circumferential direction R, and a pressure section 4 is formed on the upper surface of each processed portion 53. The pressure section 4 has a plurality of protruding portions 4P for pressing the elastic member, which are arranged at intervals in the circumferential direction. In a preferred embodiment of the present invention, the protruding height of the protruding portions 4P from the base surface is constant.

[0025] The pressure applying portion 4 of this embodiment has a cutting region 41 in which a plurality of first convex portions 4Q are formed for forming the inelastic region 15, and a pre-pressurizing region 42 in which a plurality of second convex portions 4R are formed for forming the front hole prevention region 16 (see Figure 2).

[0026] In this embodiment, as shown in FIG. 2, a large number of first protrusions 4Q are dispersedly arranged in the cutting region 41. When the composite sheet 10A is pressed by the first protrusions 4Q, each elastic member 13 is cut at multiple locations to form non-elastic regions 15 (see FIG. 3). The multiple first protrusions 4Q are preferably arranged so that, when the composite sheet 10A passes through the cutting region 41, at least two first protrusions 4Q are aligned in the circumferential direction R of the first roll 5 for each elastic member 13. In other words, when a straight line extending in the circumferential direction R of the first roll 5 is imagined on the cutting region 41, it is preferable that the straight line intersect with at least two first protrusions 4Q no matter where the line is moved from one end of the cutting region 41 to the other. This arrangement ensures that the elastic members 13 are cut more reliably.

[0027] In the present invention, the first protrusion 4Q preferably has a front edge in the rotation direction R1 that is a straight line along the rotation axis direction A of the first roll 5, from the viewpoint of cutting the elastic member 13 more reliably. In this embodiment, the planar shape of the first protrusion 4Q is an oval shape extending in the rotation axis direction A, but is not limited to this and may be a rhombic shape, a circle, an ellipse, a rectangle, etc. The oval shape in this embodiment also includes a shape in which there are curved lines at both ends in the rotation axis direction A and the ends are connected by a straight line, as shown in Fig. 2 .

[0028] As shown in FIG. 2, the pre-pressurization region 42 in this embodiment has a plurality of second protrusions 4R. Of the plurality of protrusions 4P constituting the pressurization unit 4, the second protrusions 4R are the protrusions 4P located at the front of the first roll 5 in the rotation direction R1 and first to come into contact with the composite sheet 10A. In plan view, the second protrusions 4R have an oval shape inclined with respect to the rotation direction R1, and the front edge of the first roll 5 in the rotation direction R1 has a curved shape that protrudes toward the rotation direction R1 (see FIG. 2). Having such a shape for the second protrusions 4R is preferable because it allows the second protrusions 4R to uniformly pressurize the plurality of elastic members 13 in the front hole-formation prevention region 16. A single second protrusion 4R may be provided, rather than multiple protrusions. In this embodiment, by applying pressure to the composite sheet 10A with the second protrusions 4R, a front hole-prevention region 16 is formed at the boundary between the inelastic region 15 and the elastic region 14 adjacent to the inelastic region 15 on the downstream side in the conveying direction, to prevent holes from being formed in the composite sheet 10A (see FIG. 3). The elastic members 13 in the front hole-prevention region 16 may or may not be cut by being applied with pressure by the second protrusions 4R. However, from the viewpoint of utilizing the stretchability of the elastic members 13 other than the inelastic region 15, it is preferable that the elastic members 13 in the front hole-prevention region 16 are not cut. As shown in FIG. 2, from the viewpoint of preventing the elastic members 13 from being cut, it is preferable that the length Lb of the second protrusions 4R along the rotation direction R1 of the first roll 5 is longer than the length La of the first protrusions 4Q along the rotation direction R1.

[0029] The pressure section 4 of the first roll 5, which applies pressure to a composite sheet 10A having multiple elastic members 13 disposed between the sheets, is configured and positioned in this manner, thereby forming inelastic regions 15 at predetermined locations on the composite sheet 10A having the elastic members 13 disposed therein. Specifically, as the composite sheet 10A passes between the first roll 5 and the second roll 6, the first convex portions 4Q (i.e., convex portions 4P other than the second convex portions 4R) come into contact with the composite sheet 10A, cutting the multiple elastic members 13 in the composite sheet 10A. This cutting releases the elongated elastic members 13, causing them to contract in the MD direction from the cut position. In this way, inelastic regions 15 that do not exhibit elastic stretchability are formed, resulting in the production of a composite stretchable member in which elastic regions 14 that exhibit elastic stretchability and inelastic regions 15 that do not exhibit elastic stretchability are alternately formed in the MD direction.

[0030] However, if the breaking strength of at least one of the sheets 11 and 12 used in the composite sheet 10A is low, contact between the composite sheet 10A and the second protrusions 4R, which come into contact with the composite sheet 10A first, may cause holes in the composite sheet 10A. Therefore, in this embodiment, the front edge of the second protrusions 4R, which come into contact with the composite sheet 10A first, in the rotational direction R1 is curved in a convex shape toward the rotational direction R1. This configuration ensures that the first contact point between the second protrusions 4R and the composite sheet 10A, which applies the greatest impact to the composite sheet 10A, is a point. This minimizes the area where the impact force is applied to the fibers of the composite sheet 10A (the starting point of holes), thereby preventing holes from being formed in the composite sheet 10A. In other words, by adopting a combination of the cutting region 41 and the pre-pressurizing region 42, even if fluctuations in processing conditions or unevenness in the material occur, it is possible to reliably form a non-elastic region by eliminating or reducing the elastic stretchability at specific parts of the composite sheet where the elastic member is arranged, while suppressing the occurrence of holes in the composite sheet.

[0031] In this embodiment, the shape of the second protrusions 4R in a plan view is different from that of the first protrusions 4Q. Specifically, the shape of the second protrusions 4R in a plan view is an oval shape inclined in the rotational direction R1, but is not limited to this. The second protrusions 4R may have any shape as long as the front edge in the rotational direction R1 has a curved shape that is convex toward the rotational direction R1, and may have any of the shapes shown in Figures 6(a) to 6(l). From the viewpoint of making indentations of the second protrusions 4R less noticeable and improving the appearance, it is also preferable that the shape of the second protrusions 4R be the shape shown in Figure 6(b). 6(k), the front edge of the second protrusion 4R in the rotational direction R1 also has a curved shape that protrudes toward the rotational direction R1. As shown in FIGS. 6(c) and 6(d), the pre-pressurization region 42 may have multiple rows of second protrusions.

[0032] When multiple elastic members 13 are arranged at intervals in the CD direction, from the viewpoint of suppressing damage to the elastic members 13 in the front hole-forming prevention region 16 and utilizing the stretchability of the elastic members 13 other than the inelastic region 15, it is preferable that the second convex portions 4R are arranged so as not to apply pressure to the elastic members 13, for example, so as to apply pressure between the elastic members 13. More specifically, it is preferable that all of the second convex portions 4R are arranged so as to apply pressure between the elastic members 13 (see FIG. 14). It is preferable that the second convex portions 4R are arranged so as not to apply pressure to the elastic members that contribute greatly to stretchability. For example, when a stretchable sheet 70 (described later) is used for at least one of the sheets 11 and 12, it is preferable that the second convex portions 4R are arranged so as to apply pressure between the elastic members 13, rather than between the elastic filaments 73.

[0033] 2, a large number of protrusions 4P are dispersed and arranged in a staggered pattern in the cutting region 41 of the pressure applying unit 4. More specifically, as shown in FIG. 2, the first protrusions 4Q are arranged to form a first protrusion row 41A in which a plurality of first protrusions 4Q are aligned in series at regular intervals along the rotation axis direction A. In the pre-pressurizing region 42, a plurality of second protrusions 4R are arranged in series along the rotation axis direction A at regular intervals to form a second protrusion row 42A. In the post-pressurizing region 43 described later, a plurality of third protrusions 4S are arranged in series along the rotation axis direction A at regular intervals to form a third protrusion row 43A.

[0034] Because the pressure applying unit 4 contacts the composite sheet 10A in order from the front to the rear in the rotation direction R1 of the roll 5, there is a period of time within the cutting region 41 when adjacent first protrusion rows 41A simultaneously apply pressure to the composite sheet 10A. However, the third protrusions 4S, which contact the composite sheet last, have no adjacent protrusion rows behind them in the conveyance direction, so the third protrusions 4S apply pressure alone for a longer period of time. Therefore, contact with the third protrusions 4S, which contact the composite sheet last, is likely to cause holes in the composite sheet 10A. Therefore, in order to prevent holes from being formed in the composite sheet 10A, the pressure applying unit 4 of this embodiment has a post-pressure applying region 43. As shown in FIG. 2, multiple third protrusions 4S are arranged in the post-pressurizing region 43. Among the multiple protrusions 4P constituting the pressurizing unit 4, the third protrusion 4S is the protrusion 4P located at the rear end in the rotation direction R1 of the first roll 5 and the last to come into contact with the composite sheet 10A. In plan view, the third protrusion 4S has an oval shape inclined toward the rotation direction R1, and its rear edge in the rotation direction R1 of the first roll 5 has a curved convex shape facing away from the rotation direction R1 (see FIG. 2). This configuration ensures that the point where the third protrusion 4S and the composite sheet 10A come into contact last, where the greatest load is applied to the composite sheet 10A, becomes a point. This minimizes the area where force is applied to the fibers of the composite sheet 10A (the starting point of perforation), thereby suppressing the occurrence of perforations in the composite sheet 10A. Note that a single third protrusion 4S may be arranged instead of multiple ones.

[0035] In this embodiment, by applying pressure to the composite sheet 10A with the third convex portions 4S, a rear hole-prevention region 17 for preventing holes from being formed in the composite sheet 10A at the boundary between the inelastic region 15 and the elastic region 14 adjacent to the inelastic region 15 on the upstream side in the conveying direction (see FIG. 3). The elastic members 13 in the rear hole-prevention region 17 may or may not be cut by being applied with the third convex portions 4S. However, from the viewpoint of utilizing the stretchability of the elastic members 13 other than the inelastic region 15, it is preferable that the elastic members 13 in the rear hole-prevention region 17 are not cut. As shown in FIG. 2, from the viewpoint of preventing the elastic members 13 from being cut, it is preferable that the length Lc of the third convex portions 4S along the rotation direction R1 of the first roll 5 is longer than the length La of the first convex portions 4Q along the rotation direction R1.

[0036] When multiple elastic members 13 are arranged at intervals in the CD direction, from the viewpoint of suppressing damage to the elastic members 13 in the rear hole prevention region 17 and utilizing the stretchability of the elastic members 13 other than the inelastic region 15, it is preferable that the third convex portions 4S are arranged so as not to apply pressure to the elastic members 13, for example, so as to apply pressure between the elastic members 13. More specifically, it is preferable that all of the third convex portions 4S are arranged so as to apply pressure between the elastic members 13 (see FIG. 14).

[0037] From the viewpoint of preventing cutting of elastic member 13 and preventing holes from being formed in composite sheet 10A, the pressure with which pressure unit 4 presses composite sheet 10A is preferably set to a linear pressure of 70 N / mm to 1800 N / mm, and more preferably 80 N / mm to 1400 N / mm. Note that the linear pressure here refers to a numerical value indicating the pressure applied between a pair of rolls, and is the value obtained by dividing the pressure applied between first roll 5 and second roll 6 by the length of the contact line when first roll 5 and second roll 6 are brought into contact, ignoring the crushing of the rolls.

[0038] From the viewpoint of suppressing the occurrence of holes in the composite sheet 10A, it is preferable that the distance W1 between the second protrusion 4R and the first protrusion 4Q adjacent to the second protrusion 4R be shorter than the distance W2 between adjacent first protrusions 4Q (see FIG. 4). That is, it is preferable that the distance W1 between the second protrusion row 42A and the first protrusion row 41A be shorter than the distance W2 between the first protrusion rows 41A. With this configuration, it is possible to suppress the impact force when the protrusion 4P that presses the composite sheet 10A changes from the second protrusion 4R to the first protrusion 4Q, thereby suppressing the occurrence of holes in the composite sheet 10A. From the viewpoint of achieving such an effect, the distance W1 between the second convex portion 4R and the first convex portion 4Q adjacent to the second convex portion 4R is preferably 0.1 mm or more, more preferably 0.2 mm or more, and is preferably 5 mm or less, more preferably 1 mm or less, and is preferably 0.1 mm or more and 5 mm or less, more preferably 0.2 mm or more and 1 mm or less. From a similar viewpoint, the distance W2 between adjacent first protrusions 4Q is preferably 0.2 mm or more, more preferably 0.3 mm or more, and is preferably 10 mm or less, more preferably 5 mm or less, and is preferably 0.2 mm or more and 5 mm or less, more preferably 0.3 mm or more and 10 mm or less.

[0039] From the viewpoint of suppressing the occurrence of holes in the composite sheet 10A, it is also preferable that the distance W3 between the third protrusion 4S and the first protrusion 4Q adjacent to the third protrusion 4S be shorter than the distance W2 between adjacent first protrusions 4Q (see FIG. 5). In other words, it is preferable that the distance W3 between the third protrusion row 43A and the first protrusion row 41A be shorter than the distance W2 between the first protrusion rows 41A. With this configuration, it is possible to suppress the impact force when the protrusion 4P applying pressure to the composite sheet 10A changes from the first protrusion 4Q to the third protrusion 4S, thereby suppressing the occurrence of holes in the composite sheet 10A. From the viewpoint of achieving such an effect, the distance W3 between the third convex portion 4S and the first convex portion 4Q adjacent to the third convex portion 4S is preferably 0.1 mm or more, more preferably 0.2 mm or more, and is preferably 5 mm or less, more preferably 1 mm or less, and is preferably 0.1 mm or more and 5 mm or less, more preferably 0.2 mm or more and 1 mm or less.

[0040] <Measuring method for gaps W1, W2, and W3> The surface of the pressure section 4 of the first roll 5 is observed with a microscope, and the distance between adjacent first convex row 41A and second convex row 42A, the distance between adjacent first convex row 41A, or the distance between adjacent first convex row 41A and third convex row 43A is measured, and the measured distance is designated as distance W1, distance W2, or distance W3.

[0041] From the viewpoint of improving the appearance of the composite elastic member 10, it is preferable that the maximum value of the sum of the lengths of the second convex portions 4R along the rotational axis direction A is smaller than the minimum value of the sum of the lengths of the first convex portions 4Q along the rotational axis direction A. With this configuration, the length along the rotational axis direction A along which the second convex portions 4R pressurize the composite sheet 10A can be made smaller than the length along the rotational axis direction A along which the first convex portions 4Q pressurize the composite sheet 10A, thereby improving the appearance of the composite elastic member 10. From the viewpoint of achieving such an effect, the maximum value of the sum of the lengths of the second convex portions 4R along the rotation axis direction A is preferably 10 mm or more, more preferably 20 mm or more, preferably 120 mm or less, more preferably 100 mm or less, preferably 10 mm or more and 120 mm or less, more preferably 20 mm or more and 100 mm or less. From a similar viewpoint, the minimum value of the sum of the lengths of the first convex portions 4Q along the rotation axis direction A is preferably 11 mm or more, more preferably 21 mm or more, and preferably 125 mm or less, more preferably 105 mm or less, and preferably 11 mm or more and 125 mm or less, more preferably 21 mm or more and 105 mm or less.

[0042] From the viewpoint of improving the appearance of the composite elastic member 10, it is also preferable that the maximum value of the sum of the lengths of the third convex portions 4S along the rotational axis direction A is smaller than the minimum value of the sum of the lengths of the first convex portions 4Q along the rotational axis direction A. With this configuration, the length along the rotational axis direction A along which the third convex portions 4S pressurize the composite sheet 10A can be made smaller than the length along the rotational axis direction A along which the first convex portions 4Q pressurize the composite sheet 10A, thereby improving the appearance of the composite elastic member 10. From the viewpoint of achieving such an effect, the maximum value of the sum of the lengths of the third convex portions 4S along the rotation axis direction A is preferably 10 mm or more, more preferably 20 mm or more, preferably 120 mm or less, more preferably 100 mm or less, preferably 10 mm or more and 120 mm or less, more preferably 20 mm or more and 100 mm or less. From a similar viewpoint, the minimum value of the sum of the lengths of the first convex portions 4Q along the rotation axis direction A is preferably 11 mm or more, more preferably 21 mm or more, and preferably 125 mm or less, more preferably 105 mm or less, and preferably 11 mm or more and 125 mm or less, more preferably 21 mm or more and 105 mm or less.

[0043] <Method of calculating (measuring) the maximum sum of lengths of the second convex portions 4R along the rotation axis direction A and the maximum sum of lengths of the third convex portions 4S along the rotation axis direction A> The surface of the pressure section 4 of the first roll 5 is observed under a microscope, and the sum of the lengths L4 of each of the second protrusions 4R constituting the second protrusion row 42A along the rotation axis direction A is calculated, and this is defined as the maximum sum of the lengths of the second protrusions 4R along the rotation axis direction A. The sum of the lengths of the second protrusions 4R is calculated as the sum of the parts that lie within the range of the length of the pressure section 4 along the rotation axis direction A. The maximum sum of the lengths of the third protrusions 4S along the rotation axis direction A is calculated in the same way as the sum of the lengths of the second protrusions 4R, except that the sum of the lengths L5 of each protrusion of the third protrusions 4S along the rotation axis direction A is calculated. <Method for calculating (measuring) the minimum value of the sum of the lengths of the first convex portions 4Q along the rotation axis direction A> The surface of the pressure section 4 of the first roll 5 is observed under a microscope, and the total length L3 of each of the first protrusions 4Q constituting the first protrusion row 41A is calculated, and this is defined as the minimum value of the total length of the first protrusions 4Q along the rotational axis direction A. If the total length of the first protrusions 4Q along the rotational axis direction A varies depending on the first protrusion row 41A, the smallest value of the total length of the first protrusions 4Q along the rotational axis direction A is defined as the minimum value of the total length of the first protrusions 4Q along the rotational axis direction A. The total length of the first protrusions 4Q is calculated as the total length of the portion within the range of the length of the pressure section 4 along the rotational axis direction A, similar to the total length of the second protrusions 4R or the third protrusions 4S.

[0044] The protrusion height of the first convex portion 4Q, the second convex portion 4R, and the third convex portion 4S from the base surface is preferably 0.1 mm or more, more preferably 0.2 mm or more, and is preferably 1.5 mm or less, more preferably 1.0 mm or less, and is preferably 0.1 mm or more and 1.5 mm or less, more preferably 0.2 mm or more and 1.0 mm or less.

[0045] The elastic member 13 used can be, for example, elastic members of various materials and forms (e.g., thread-like) conventionally used in absorbent articles. Examples of materials for forming the elastic member 13 include polyurethane elastic fiber (spandex), natural rubber, synthetic rubber, etc. When the thread-like elastic member 13 is in thread form, its thickness is preferably 150 dtex or more and 1500 dtex or less, and more preferably 200 dtex or more and 1300 dtex or less. The elongation ratio of the elastic member 13 is preferably 1.1 times or more and 10.0 times or less of its natural length. Furthermore, elastic filaments 73, which will be described later, can also be used as the elastic member 13.

[0046] The adhesive used may be, for example, any of various adhesives conventionally used in absorbent articles, and preferably a hot melt adhesive. Examples of hot melt adhesives include styrene-based and olefin-based adhesives. As styrene-based hot melt adhesives, it is preferable to use styrene-butadiene-styrene copolymer (SBS), styrene-isoprene-styrene copolymer (SIS), styrene-ethylene-butylene-styrene copolymer (SEBS), which is a hydrogenated product of SBS, and blend-based hot melt adhesives obtained by blending two or more of these.

[0047] At least one of the sheets 11 and 12 constituting the composite sheet 10A is preferably a stretchable sheet 70 that has stretchability in one direction and in which, when stretched in at least that direction, high basis weight portions and low basis weight portions are alternately arranged in that direction. In this embodiment, the stretchable sheet 70 is used as the sheet 11. As shown in FIG. 7, the stretchable sheet 70 may be one in which elastic filaments 73 arranged to extend in one direction are bonded between two fiber sheets 71 and 72. The two fiber sheets 71 and 72 are stretchable in one direction in which the elastic filaments 73 extend. When the stretchable sheet 70 described above is used as a sheet constituting the composite sheet 10A, the one direction in which the elastic filaments 73 extend is aligned with the MD direction. The fiber sheets 71 and 72 may be made of, for example, nonwoven fabric. Because the stretchable sheet 70 has low breaking strength, it is prone to holes, which enhances the effects of the present invention. It should be noted that the stretchable sheet 70 may include a sheet other than a stretchable sheet having stretchability in one direction (for example, a non-stretchable sheet), provided that the stretchable sheet 70 has stretchability in one direction.

[0048] In the present invention, "having stretchability in one direction" specifically means that the maximum elongation in one direction of the sheet (for example, stretchable sheet 70) is preferably 50% or more.

[0049] The "maximum elongation" referred to here is the elongation rate when the object to be measured (e.g., elastic sheet 70) is stretched to a length that cannot be stretched any further (the length just before the material breaks), and is calculated using the following formula (1). Maximum elongation (%) = {(length after elongation - length before elongation) / length before elongation} × 100…(1) The maximum elongation can be measured by the following procedure. With the object being measured in its natural state (the contracted state of the elastic member), marks are made at 50 mm intervals in the Y direction, and the distance between these marks is measured and taken as the "length before elongation." Next, the object is elongated in its stretching direction until just before the object breaks, and the distance between the marks in this elongated state is measured and taken as the "length after elongation." These measured values ​​are then substituted into the above formula (1) to calculate the maximum elongation.

[0050] As sheets constituting the stretchable sheet 70, for example, (1) stretchable nonwoven fabric in which a stretchable fiber layer is integrated on both sides or one side of an elastic fiber layer, (2) stretchable nonwoven fabric in which a stretchable fiber layer is integrated on both sides or one side of a net-like elastic sheet, (3) stretchable nonwoven fabric in which a stretchable fiber layer is integrated on both sides or one side of an elastic sheet made of an elastic film, and (4) stretchable nonwoven fabric in which a large number of elastic filaments arranged so as to extend in one direction without crossing each other are integrated into a stretchable fiber layer, can be preferably used. The term "stretchable fiber layer" as used herein includes not only a fiber layer that is stretchable before being integrated with an elastic material, but also a fiber layer that is made stretchable by mechanical processing or the like after being integrated with an elastic material. Methods for integrating the elastic fiber layer and the extensible fiber layer include, for example, a method of laminating them and entangling the fibers by water flow entangling or air through, or a method of joining them by heat embossing, adhesive, ultrasonic waves, etc.

[0051] The stretchable sheet 70 corresponds to the stretchable nonwoven fabric described in (4) above. The stretchable sheet 70 having the above-described configuration can be produced, for example, according to the method described in JP 2009-61743 A. Specifically, for example, a plurality of molten elastic filaments 73 spun from a spinning nozzle are drawn and stretched at a predetermined speed, and before the elastic filaments 73 solidify, the elastic filaments 73 are fused to fiber sheets 71, 72 so that the elastic filaments 73 are aligned in one direction without crossing each other, and then the sheets 71, 72 to which the elastic filaments 73 are fused are stretched along the direction in which the elastic filaments 73 extend, thereby producing the stretchable sheet 70. The stretchable sheet 70 as a whole is stretchable in one direction in which the elastic filaments 73 extend.

[0052] Examples of materials for forming the elastic filaments 73 include natural rubber, EVA rubber, styrene-butadiene rubber, butadiene rubber, synthetic rubber such as isoprene rubber and neoprene rubber, polyurethane, and thermoplastic elastomer. The thickness of the elastic filament 73 is preferably 30 μm or more and 200 μm or less, and more preferably 50 μm or more and 130 μm or less. The extension ratio of the elastic filament 73 is preferably 1.1 times or more and 10.0 times or less the natural length.

[0053] The basis weight of the fiber sheets 71 and 72 constituting the stretchable sheet 70 is preferably 3 g / m from the viewpoint of thickness, design, etc. 2 More preferably, 5 g / m 2 or more, and preferably 30 g / m 2 Less than 10 g / m, more preferably 2 less than 3 g / m 2 More than 30g / m 2 Less than 5g / m, more preferably 2 More than 10g / m 2 The following is the result.

[0054] The basis weight of the stretchable sheet 70 is preferably 6 g / m from the viewpoint of preventing holes from being formed in the composite sheet 10A and from the viewpoint of thickness, design, etc. 2 More preferably, 8g / m 2 or more, and preferably 60 g / m 2 Less than 45 g / m 2 and preferably 6 g / m 2 More than 60g / m 2 Less than 8g / m, more preferably 2 More than 45g / m 2 The following is the result.

[0055] From the viewpoint of preventing breakage when the sheet is in use, the breaking strength of the elastic sheet 70 is preferably 3N / 50mm or more, more preferably 5N / 50mm or more, and preferably 90N / 50mm or less, more preferably 70N / 50mm or less, and preferably 3N / 50mm or more and 90N / 50mm or less, more preferably 5N / 50mm or more and 70N / 50mm or less.

[0056] [Method for measuring breaking strength] A rectangular test piece measuring 50 mm in the CD direction and 300 mm in the MD direction perpendicular to the CD direction is cut out of the composite sheet 10A. This cut-out test piece is used as the test sample. This test sample is attached to the chuck of a tensile tester (for example, Orientec's Tensilon tensile tester "RTA-100") so that the MD direction is the tensile direction. The distance between the chucks is 100 mm. The test sample is then pulled at a rate of 300 mm / min, and the maximum load point at which the test sample breaks is used as the breaking strength.

[0057] In the present invention, it is also preferable that at least one of the sheets 11, 12 is a non-stretchable sheet 75. Here, "non-stretchable sheet" refers to a sheet whose maximum elongation is preferably less than 50%, more preferably 0%. Non-woven fabrics manufactured by various methods, resin films, etc. can be used as the non-stretchable sheet 75, and examples of non-woven fabrics include spunbond non-woven fabrics, air-through non-woven fabrics, and needle-punched non-woven fabrics. The non-stretchable sheet 75 may have a single-layer structure or a laminate structure in which two or more sheets are laminated.

[0058] When at least one of the sheets 11 and 12 is a non-stretchable sheet 75, the basis weight of the non-stretchable sheet 75 is preferably 6 g / m from the viewpoint of preventing holes from being formed in the composite sheet 10A and from the viewpoint of thickness, design, etc. 2 More preferably, 8g / m 2 or more, and preferably 50 g / m 2 Less than 45 g / m 2 and preferably 6 g / m 2 More than 50g / m 2 Less than 8g / m, more preferably 2 More than 45g / m 2 The following is the result.

[0059] When at least one of the sheets 11, 12 is a non-stretch sheet 75, from the viewpoint of preventing the sheet from breaking when in use, the breaking strength of the non-stretch sheet 75 is preferably 5N / 50mm or more, more preferably 10N / 50mm or more, and preferably 100N / 50mm or less, more preferably 90N / 50mm or less, and preferably 5N / 50mm or more and 100N / 50mm or less, and more preferably 10N / 50mm or more and 90N / 50mm or less.

[0060] The composite elastic member 10 manufactured in this manner is a stretchable sheet with elasticity. When such a composite elastic member 10 is disposed, for example, around the waist of a pants-type diaper, it contributes to improving the fit of the diaper. In the disposable diaper, it is preferable that the end of the absorber of the disposable diaper is disposed so as to overlap the inelastic region 15 formed by the pressure section 4 in the composite elastic member 10. This configuration suppresses contraction of the absorber due to the elastic member 13, improving leakage prevention.

[0061] Next, a pressure unit 4a according to another embodiment will be described based on its preferred embodiment with reference to the drawings. The pressure unit 4a can be appropriately adapted to the configuration of the manufacturing apparatus 1 described above, unless there is a contradiction. Below, components different from those in the embodiment shown in FIGS. 1 to 7 will be mainly described, and similar components will be assigned the same reference numerals and will not be described again. For components not specifically described, the description of the components of the manufacturing apparatus 1 will be applied as appropriate.

[0062] In the above-described pressure unit 4, the second convex portions 4R have front edges in the rotation direction R1 of the first roll 5 that have a curved shape that convex toward the rotation direction R1, but the second convex portions 4Ra of the pressure unit 4a of this embodiment have front edges in the rotation direction R1 that are straight lines extending along the rotation axis direction A. Specifically, the second convex portions 4Ra of the manufacturing apparatus 1a have an oval shape extending in the CD direction in a plan view, and the front edges of the second convex portions 4Ra in the rotation direction R1 are straight lines along the rotation axis direction A that are shorter than the front edges of the first convex portions 4Q in the rotation direction R1 (see FIGS. 8 and 10). Even with this configuration, the portion of the composite sheet 10A that receives the most impact and where the second protrusions 4Ra first come into contact with the composite sheet 10A is shorter than the first protrusions 4Q, and the portion of the composite sheet 10A where the impact force is applied (the starting point of perforation) can be made smaller, thereby suppressing the occurrence of perforations in the composite sheet 10A. In other words, even if the composite sheet has low strength, it is possible to reliably form inelastic regions by eliminating or reducing the elastic stretchability in the predetermined portion of the composite sheet where the elastic member is arranged, while suppressing the occurrence of perforations in the composite sheet.

[0063] In this embodiment, by pressing the composite sheet 10A with the second protrusions 4Ra, a front hole-prevention region 16a is formed at the boundary between the inelastic region 15 and the elastic region 14 adjacent to the inelastic region 15 on the downstream side in the conveying direction, to prevent holes from being formed in the composite sheet 10A (see FIG. 9). The elastic members 13 in the front hole-prevention region 16a may or may not be cut. However, from the viewpoint of utilizing the stretchability of the elastic members 13 other than the inelastic region 15, it is preferable that the elastic members 13 in the front hole-prevention region 16a are not cut. As shown in FIG. 8, from the viewpoint of preventing cuts in the elastic members 13, it is preferable that the length Lb of the second protrusions 4Ra along the rotation direction R1 of the first roll 5 is longer than the length La of the first protrusions 4Q along the rotation direction R1.

[0064] In order to prevent holes from being formed in the composite sheet, the length L2 of the front edge of the second convex portion 4Ra in the rotation direction R1 is preferably 0.01 mm or more, more preferably 0.1 mm or more, and is preferably 5 mm or less, more preferably 4 mm or less, and is preferably 0.01 mm or more and 5 mm or less, more preferably 0.1 mm or more and 4 mm or less. From the same viewpoint as above, the length L1 of the front edge of the first protrusion 4Q in the rotational direction R1 is preferably 1 mm or more, more preferably 1.5 mm or more, preferably 10 mm or less, more preferably 5 mm or less, preferably 1 mm or more and 10 mm or less, more preferably 1.5 mm or more and 5 mm or less. From the same viewpoint as above, the length L2 of the front edge portion of the second protrusion 4Ra in the rotational direction R1 is preferably 1% or more, more preferably 10% or more, and preferably 90% or less, more preferably 70% or less, relative to the length L1 of the front edge portion of the first protrusion 4Q in the rotational direction R1, and is preferably 1% or more and 90% or less, more preferably 10% or more and 70% or less. From the viewpoint of suppressing the occurrence of holes in the composite sheet, it is also preferable that the total length of the second protrusions 4Ra is shorter than the total length of the first protrusions 4Q.

[0065] In the present embodiment, the shape of the second protrusion 4Ra in a plan view is an oval shape extending in the CD direction, but is not limited to this. The second protrusion 4Ra may have a front edge in the rotational direction R1 that is a straight line shorter than the front edge of the first protrusion 4Q in the rotational direction R1. For example, the shape of the second protrusion 4Ra in a plan view may be a triangle as shown in Fig. 11(a) or a hexagon as shown in Fig. 11(b).

[0066] Furthermore, in the above-described pressure unit 4, the rear edge of the third convex portion 4S in the rotation direction R1 of the first roll 5 has a curved shape that convex toward the opposite direction of the rotation direction R1, but the rear edge of the third convex portion 4Sa of the pressure unit 4a in this embodiment in the rotation direction R1 is a straight line extending along the rotation axis direction A. Specifically, the third convex portion 4Sa of the manufacturing apparatus 1a has an oval shape extending in the CD direction in a plan view, and the rear edge of the third convex portion 4Sa in the rotation direction R1 is a straight line along the rotation axis direction A that is shorter than the rear edge of the first convex portion 4Q in the rotation direction R1. Even with such a configuration, the rear edge of the third convex portion 4Sa, which is the portion that bears the greatest load on the composite sheet 10A and where the third convex portion 4S of the third convex portion 4Sa last comes into contact with the composite sheet 10A, is shorter than the edge of the first convex portion 4Q, and the area where force is applied to the fibers of the composite sheet 10A (the starting point of holes) can be made smaller, thereby suppressing the occurrence of holes in the composite sheet 10A.

[0067] In this embodiment, by applying pressure to the composite sheet 10A with the third convex portion 4S, a rear hole-prevention region 17a for preventing holes from being formed in the composite sheet 10A at the boundary between the inelastic region 15 and the elastic region 14 adjacent to the inelastic region 15 on the downstream side in the conveying direction. That is, the rear hole-prevention region 17a is disposed in a position corresponding to the post-pressurization region 43a (see FIG. 8 ). Note that the elastic members 13 in the rear hole-prevention region 17a may or may not be cut. However, from the viewpoint of utilizing the stretchability of the elastic members 13 other than the inelastic region 15, it is preferable not to cut the elastic members 13 in the rear hole-prevention region 17a.

[0068] The present invention is not limited to the above-described embodiments and can be modified as appropriate. The above-described embodiments may also be combined. For example, the third convex portion 4S in the pressure section 4 described above has a rear edge portion in the rotation direction R1 of the first roll 5 that is curved and convex toward the rotation direction R1, but the rear edge portion of the third convex portion 4S in the rotation direction R1 may also be a straight line along the rotation axis direction A that is shorter than the rear edge portion of the first convex portion 4Q in the rotation direction R1. Furthermore, the third convex portion 4S in the pressure section 4a described above is a straight line along the rotation axis direction A, with the rear edge of the third convex portion 4S in the rotation direction R1 being shorter than the rear edge of the first convex portion 4Q in the rotation direction R1, but the rear edge of the first roll 5 in the rotation direction R1 may also be a curved line convex toward the rotation direction R1. Furthermore, although two processed portions 53 are formed on the first roll 5, the number of processed portions 53 may be one, or three or more.

[0069] The composite sheet 10A is a sheet in which a stretchable sheet 70 is used for at least one of the sheets 11 and 12, and an elastic member 13 may be introduced between the sheets 11 and 12 (see FIG. 12(a)), or an elastic member 13 may not be introduced between the sheets 11 and 12 (see FIG. 12(b)). When a stretchable sheet 70 is used for at least one of the sheets 11 and 12 and an elastic member 13 is not introduced, the elastic filaments 73 correspond to the elastic member 13 of the present invention. The composite sheet 10A may be formed solely from the stretchable sheet 70 (see FIG. 12(c)). In this case, the elastic filaments 73 correspond to the elastic members 13 of the present invention. The composite sheet 10A is a composite sheet having a configuration in which an elastic member 13 is sandwiched between sheets 11 and 12, and both of the sheets 11 and 12 sandwiching the elastic member 13 may be non-stretchable sheets 75 (see Figures 12(d) and 13). The composite sheet 10A may be a composite sheet having a configuration in which a stretchable sheet 70 is sandwiched between two non-stretchable sheets 75 (see FIG. 12(e)). In this case, the elastic filaments 73 correspond to the elastic members 13 of the present invention. The stretchable sheet 70 may be a composite sheet in which a non-stretchable sheet 75 is disposed in place of one of the fiber sheets 71 and 72 (see FIG. 12(f)). In this case, the elastic filaments 73 correspond to the elastic members 13 of the present invention. For ease of explanation, FIGS. 12(a) to 12(f) show the state before the sheets 11 and 12 are joined together.

[0070] In relation to the above-described embodiment, the present invention further discloses the following manufacturing method and manufacturing apparatus for a composite elastic member. <1> A method for manufacturing a composite elastic member in which elastic regions that exhibit elastic stretchability and inelastic regions that do not substantially exhibit elastic stretchability are alternately formed in one direction, a step of conveying a composite sheet having a plurality of sheets and a plurality of elastic members disposed between the sheets in a direction in which the elastic members extend, while pressing the composite sheet between a first roll having a plurality of protrusions and a second roll, thereby cutting the elastic members and forming the non-elastic region in the composite sheet, and forming a front hole-prevention region at a boundary between the non-elastic region and an elastic region adjacent to the non-elastic region on the downstream side in the conveying direction, for preventing holes from being formed in the composite sheet; A method for manufacturing a composite elastic member, wherein the first roll has a pressure section with a plurality of convex portions on a portion of the circumferential surface in the circumferential direction, the pressure section having a cutting region in which a plurality of first convex portions for forming the inelastic region are formed, and a pre-pressure region located in front of the cutting region in the rotation direction of the first roll and in which a plurality of second convex portions for pressurizing the composite sheet are formed, the front edge of the second convex portions in the rotation direction having a convex curved shape toward the rotation direction.

[0071] <2> The first convex portion and the second convex portion have different shapes in a plan view. <1> A method for manufacturing the composite elastic member described above. <3> The first protrusion has a front edge in the rotation direction that is a straight line along the rotation axis direction of the first roll. <1> or <2> A method for manufacturing the composite elastic member described above. <4> A method for manufacturing a composite elastic member in which elastic regions that exhibit elastic stretchability and inelastic regions that do not substantially exhibit elastic stretchability are alternately formed in one direction, a step of conveying a composite sheet having a plurality of sheets and a plurality of elastic members disposed between the sheets in a direction in which the elastic members extend, while pressing the composite sheet between a first roll having a plurality of protrusions and a second roll, thereby cutting the elastic members and forming the non-elastic region in the composite sheet, and forming a front hole-prevention region at a boundary between the non-elastic region and an elastic region adjacent to the non-elastic region on the downstream side in the conveying direction, for preventing holes from being formed in the composite sheet; A method for manufacturing a composite elastic member, wherein the first roll has a pressure section with a plurality of convex portions on a portion of the circumferential surface in the circumferential direction, the pressure section having a cutting region in which a plurality of first convex portions for forming the inelastic region are formed, and a pre-pressure region located in front of the cutting region in the rotation direction of the first roll and in which a plurality of second convex portions for pressurizing the composite sheet are formed, the front edges of the first convex portions and the second convex portions in the rotation direction being straight lines along the rotation axis direction of the first roll, and the length of the edge of the second convex portions is shorter than the length along the rotation axis direction of the front edges of the first convex portions. <5> forming the non-elastic region and forming a rear hole prevention region at a boundary between the non-elastic region and an adjacent elastic region on the upstream side of the non-elastic region in the conveying direction to prevent holes from being formed in the composite sheet; The pressure applying unit has a post-pressure applying region located behind the cutting region in the rotation direction and having a plurality of third convex portions formed therein for applying pressure to the composite sheet, and the third convex portions have rear edges in the rotation direction that have a curved shape that is convex in the opposite direction to the rotation direction, or a straight line that is shorter than the rear edges of the first convex portions in the rotation direction and that extends along the rotation axis direction of the first roll. <1> or <4> A method for manufacturing the composite elastic member described above. <6> The length of the second protrusion along the rotation direction of the first roll is longer than the length of the first protrusion along the rotation direction. <1> or <4> A method for manufacturing the composite elastic member described above. <7> the length of the third protrusion along the rotation direction of the first roll is longer than the length of the first protrusion along the rotation direction; <5> A method for manufacturing the composite elastic member described above. <8> the maximum value of the sum of the lengths of the second protrusions along the rotation axis direction of the first roll is smaller than the minimum value of the sum of the lengths of the first protrusions along the rotation axis direction; <1> or <4> A method for manufacturing the composite elastic member described above. <9> a distance between the second convex portion and the first convex portion adjacent to the second convex portion is shorter than a distance between adjacent first convex portions; <1> or <4> A method for manufacturing the composite elastic member described above. <10> At least one of the sheets constituting the composite sheet is a stretchable sheet having stretchability in one direction, and in a state stretched at least in the one direction, high basis weight portions having a relatively high basis weight and low basis weight portions having a relatively low basis weight are alternately arranged in the one direction. <1> or <4> A method for manufacturing the composite elastic member described above. <11> The composite sheet has a configuration in which an elastic member is sandwiched between sheets, and all of the sheets are non-stretchable sheets. <1> or <4> A method for manufacturing the composite elastic member described above.

[0072] <12> The first roll is provided with a heating means therein, The heating temperature of the pressure portion of the first roll by the heating means is 50°C or higher and 170°C or lower. <1> or <4> A method for manufacturing the composite elastic member described above. <13> the first protrusion comes into contact with the composite sheet and cuts the plurality of elastic members; <1> or <4> A method for manufacturing the composite elastic member described above. <14> The pressure applied by the pressure unit to the composite sheet is 70 N / mm or more and 1800 N / mm or less in terms of linear pressure. <1> or <4> A method for manufacturing the composite elastic member described above. <15> The second protrusion applies pressure between the elastic members. <1> or <4> A method for manufacturing the composite elastic member described above. <16> The aforementioned <1> or <4> A pant-type diaper comprising a composite elastic member produced by the method described above. <17> A manufacturing apparatus used to manufacture a composite elastic member in which elastic regions that exhibit elastic stretchability and inelastic regions that do not substantially exhibit elastic stretchability are alternately formed in one direction, a pressure means for conveying a composite sheet having a plurality of sheets and a plurality of elastic members disposed between the sheets in a direction in which the elastic members extend, and pressing the composite sheet between a first roll and a second roll each having a plurality of protrusions, thereby cutting the elastic members and forming the non-elastic region in the composite sheet, and also forming a front hole-prevention region at the boundary between the non-elastic region and an elastic region adjacent to the non-elastic region on the downstream side in the conveying direction, for preventing holes from being formed in the composite sheet; A manufacturing apparatus for a composite elastic member, wherein the first roll has a pressure section with a plurality of convex portions on a portion of the circumferential surface in the circumferential direction, the pressure section having a cutting area in which a plurality of first convex portions for forming the inelastic area are formed, and a pre-pressing area located in front of the cutting area in the rotation direction of the first roll and in which a plurality of second convex portions for pressurizing the composite sheet are formed, the front edge of the second convex portions in the rotation direction having a convex curved shape toward the rotation direction. <18> The first convex portion and the second convex portion have different shapes in a plan view. <17> The manufacturing apparatus for the composite elastic member according to claim 1. <19> The first protrusion has a front edge in the rotation direction that is a straight line along the rotation axis direction of the first roll. <17> or <18> The manufacturing apparatus for the composite elastic member according to claim 1.

[0073] <20> A manufacturing apparatus used to manufacture a composite elastic member in which elastic regions that exhibit elastic stretchability and inelastic regions that do not substantially exhibit elastic stretchability are alternately formed in one direction, a pressure means for conveying a composite sheet having a plurality of sheets and a plurality of elastic members disposed between the sheets in a direction in which the elastic members extend, and pressing the composite sheet between a first roll and a second roll each having a plurality of protrusions, thereby cutting the elastic members and forming the non-elastic region in the composite sheet, and also forming a front hole-prevention region at the boundary between the non-elastic region and an elastic region adjacent to the non-elastic region on the downstream side in the conveying direction, for preventing holes from being formed in the composite sheet; A manufacturing apparatus for a composite elastic member, wherein the first roll has a pressure section with a plurality of convex portions on a portion of the circumferential surface in the circumferential direction, the pressure section having a cutting area in which a plurality of first convex portions for forming the inelastic region are formed, and a pre-pressure area located in front of the cutting area in the rotation direction of the first roll and in which a plurality of second convex portions for pressurizing the composite sheet are formed, the front edges of the first convex portions and the second convex portions in the rotation direction being straight lines along the rotation axis direction of the first roll, and the length of the edge of the second convex portions is shorter than the length along the rotation axis direction of the first convex portions. <21> The pressure applying unit has a post-pressure applying region located behind the cutting region in the rotation direction and having a plurality of third convex portions formed therein for applying pressure to the composite sheet, and the third convex portions have rear edges in the rotation direction that have a curved shape that is convex in the opposite direction to the rotation direction, or a straight line that is shorter than the rear edges of the first convex portions in the rotation direction and that extends along the rotation axis direction of the first roll. <17> or <20> The manufacturing apparatus for the composite elastic member according to claim 1. <22> The length of the second protrusion along the rotation direction of the first roll is longer than the length of the first protrusion along the rotation direction. <17> or <20> The manufacturing apparatus for the composite elastic member according to claim 1. <23> the length of the third protrusion along the rotation direction of the first roll is longer than the length of the first protrusion along the rotation direction; <21> The manufacturing apparatus for the composite elastic member according to claim 1. <24> the maximum value of the sum of the lengths of the second protrusions along the rotation axis direction of the first roll is smaller than the minimum value of the sum of the lengths of the first protrusions along the rotation axis direction; <17> or <20> The manufacturing apparatus for the composite elastic member according to claim 1. <25> a distance between the second convex portion and the first convex portion adjacent to the second convex portion is shorter than a distance between adjacent first convex portions; <17> or <20> The manufacturing apparatus for the composite elastic member according to claim 1. <26> The composite sheet has a configuration in which an elastic member is sandwiched between sheets, and all of the sheets are non-stretchable sheets. <17> or <20> The manufacturing apparatus for the composite elastic member according to claim 1. <27> a heating means is provided inside each of the first roll and the second roll; <17> or <20> The manufacturing apparatus for the composite elastic member according to claim 1. <28> The second protrusion is located at the front of the protrusions in the rotation direction and is the protrusion that first comes into contact with the composite sheet. <17> or <20> The manufacturing apparatus for the composite elastic member according to claim 1.

[0074] <29> The second protrusions are arranged to apply pressure between the elastic members. <17> or <20> The manufacturing apparatus for the composite elastic member according to claim 1. <30> a length of a front edge portion of the second protrusion in the rotation direction is 0.01 mm or more and 5 mm or less, and a length of a front edge portion of the first protrusion in the rotation direction is 1 mm or more and 10 mm or less, the length of the front edge of the second protrusion in the rotation direction is 1% or more and 90% or less of the length of the front edge of the first protrusion in the rotation direction; <20> The manufacturing apparatus for the composite elastic member according to claim 1. <31> The protrusion heights of the first convex portion, the second convex portion, and the third convex portion from the base surface are 0.1 mm or more and 1.5 mm or less. <21> The manufacturing apparatus for the composite elastic member according to claim 1. [Example]

[0075] The present invention will be described in more detail below using examples, but the scope of the present invention is not limited to these examples.

[0076] Example 1 An elastic member having a configuration similar to the composite elastic member shown in Figure 3 was prepared. First, strip-shaped sheets 11 and 12 and an elastic member 13 to be inserted between these sheets 11 and 12 were prepared. Next, using the manufacturing apparatus 1, an adhesive such as a hot melt adhesive was applied to one side of the strip-shaped sheet 11 (the side facing sheet 12) using an adhesive applicator. The strip-shaped sheets 11 and 12 and multiple stretched elastic members 13 were then fed into the manufacturing apparatus 1, and pressure was applied between nip rolls 23, 23, so that the members 11, 12, and 13 were bonded to each other via the adhesive, resulting in a strip-shaped composite sheet 10A. The composite sheet 10A was then pressed by the pressure section 4 of the first roll 5, producing a composite elastic member 10 in which elastic regions 14 and inelastic regions 15 were alternately formed in one direction. The composite elastic member 10 had a front hole-prevention region 16 and a rear hole-prevention region 17. The pressure unit 4 used had the same configuration as the pressure unit shown in Fig. 2. The linear pressure when the pressure unit 4 pressed the composite sheet 10A was 646 N / mm 2 The heating temperature of the pressure section 4 of the first roll 5 was 100°C. A stretchable sheet 70 was used as the sheet 11, and a non-stretchable sheet was used as the sheet 12. The basis weight of the sheet 11 (when not stretched) was 45 g / m 2 The breaking strength was 30 N / 50 mm. The basis weight of the sheet 12 was 18 g / m 2 The breaking strength was 32 N / 50 mm. Rubber thread was used as the elastic member 13.

[0077] Example 2 The linear pressure when pressing the composite sheet 10A in the pressing unit 4 is 969 N / mm 2 A composite elastic member was produced in the same manner as in Example 1, except that:

[0078] Example 3 The linear pressure when pressing the composite sheet 10A in the pressing unit 4 is 1292 N / mm 2 A composite elastic member was produced in the same manner as in Example 1, except that:

[0079] Example 4 A composite elastic member was manufactured in the same manner as in Example 1, except that a pressure unit having the same configuration as that shown in FIG. 8 was used. The length of the front edge of the first protrusion 4Q in the rotation direction R1 was 3 mm, and the length of the front edge of the second protrusion 4Ra in the rotation direction R1 was 2 mm.

[0080] Comparative Example 1 A composite elastic member was manufactured in the same manner as in Example 1, except that a pressure applying section having only a cutting region 41 was used. The obtained composite elastic member had only an inelastic region 15 formed therein, and neither a front hole prevention region 16 nor a rear hole prevention region 17 formed therein.

[0081] 〔evaluation〕 The composite elastic members obtained in Examples 1 to 4 and Comparative Example 1 were evaluated for hole formation and cutting of the elastic members. Specifically, the composite elastic member 10 was stretched, and the hole formation in the inelastic region 15 and cutting of the elastic members 13 were visually checked. This operation was repeated 30 times. The results are shown in Table 1.

[0082] [Table 1]

[0083] As is clear from the results shown in Table 1, the composite elastic members 10 obtained in Examples 1 to 4 had satisfactory cutting of the elastic members 13, and had better hole formation conditions than Comparative Example 1. These results show that it is preferable to provide the pre-pressurization region 42 and post-pressurization region 43 in the pressure applying unit 4 from the perspective of forming inelastic regions while suppressing the occurrence of holes in the composite sheet. [Explanation of symbols]

[0084] 1 Manufacturing equipment 2. Composite sheet manufacturing method 3. Pressurizing means 4,4a Pressurizing section 4P convex part 4Q 1st convex part 4R, 4Ra Second convex part 4S, 4Sa Third convex part 5 First Roll 6 Second Roll 10 Composite elastic member 10A Composite Sheet 11 sheets 12 sheets 13 Elastic member 14 Elastic Region 15 Inelastic region 16,16a Front hole suppression area 17,17a Posterior perforation suppression region 23 Nip Roll 41 Cutting area 42,42a Pre-pressurization area 43,43a Post-compression area 70 Elastic Sheet

Claims

1. A method for manufacturing a composite elastic member in which elastic regions that exhibit elastic stretchability and inelastic regions that do not substantially exhibit elastic stretchability are alternately formed in one direction, a step of conveying a composite sheet having a plurality of sheets and a plurality of elastic members disposed between the sheets in a direction in which the elastic members extend, while pressing the composite sheet between a first roll having a plurality of protrusions and a second roll, thereby cutting the elastic members and forming the non-elastic region in the composite sheet, and forming a front hole-prevention region at a boundary between the non-elastic region and an elastic region adjacent to the non-elastic region on the downstream side in the conveying direction, for preventing holes from being formed in the composite sheet; A method for manufacturing a composite elastic member, wherein the first roll has a pressure section with a plurality of convex portions on a portion of the circumferential surface in the circumferential direction, the pressure section having a cutting region in which a plurality of first convex portions for forming the inelastic region are formed, and a pre-pressure region located in front of the cutting region in the rotation direction of the first roll and in which a plurality of second convex portions for pressurizing the composite sheet are formed, the front edge of the second convex portions in the rotation direction having a convex curved shape toward the rotation direction.

2. The method for manufacturing a composite elastic member according to claim 1 , wherein the first convex portion and the second convex portion have different shapes in a plan view.

3. The method for manufacturing a composite elastic member according to claim 1 or 2, wherein the first convex portion has a front edge in the rotation direction that is a straight line extending along the direction of the rotation axis of the first roll.

4. A method for manufacturing a composite elastic member in which elastic regions that exhibit elastic stretchability and inelastic regions that do not substantially exhibit elastic stretchability are alternately formed in one direction, a step of conveying a composite sheet having a plurality of sheets and a plurality of elastic members disposed between the sheets in a direction in which the elastic members extend, while pressing the composite sheet between a first roll having a plurality of protrusions and a second roll, thereby cutting the elastic members and forming the non-elastic region in the composite sheet, and forming a front hole-prevention region at a boundary between the non-elastic region and an elastic region adjacent to the non-elastic region on the downstream side in the conveying direction, for preventing holes from being formed in the composite sheet; A method for manufacturing a composite elastic member, wherein the first roll has a pressure section with a plurality of convex portions on a portion of the circumferential surface in the circumferential direction, the pressure section having a cutting region in which a plurality of first convex portions for forming the inelastic region are formed, and a pre-pressure region located in front of the cutting region in the rotation direction of the first roll and in which a plurality of second convex portions for pressurizing the composite sheet are formed, the first convex portions and the second convex portions having front edges in the rotation direction that are straight lines along the rotation axis direction of the first roll, and the length of the edge of the second convex portions is shorter than the length along the rotation axis direction of the front edges of the first convex portions.

5. forming the non-elastic region and forming a rear hole prevention region at a boundary between the non-elastic region and an adjacent elastic region on the upstream side of the non-elastic region in the conveying direction to prevent holes from being formed in the composite sheet; A method for manufacturing a composite elastic member as described in claim 1 or 4, wherein the pressure applying section is located behind the cutting area in the rotation direction and has a post-pressure applying area in which a plurality of third convex portions that apply pressure to the composite sheet are formed, and the third convex portions have a rear edge in the rotation direction that has a convex curve facing opposite to the rotation direction, or a straight line along the rotation axis direction of the first roll that is shorter than the rear edge of the first convex portion in the rotation direction.

6. 5. A method for manufacturing a composite elastic member as described in claim 1 or 4, wherein the maximum value of the sum of the lengths of the second convex portions along the rotation axis direction of the first roll is smaller than the minimum value of the sum of the lengths of the first convex portions along the rotation axis direction.

7. 5. The method for manufacturing a composite elastic member according to claim 1, wherein the distance between the second convex portion and the first convex portion adjacent to the second convex portion is shorter than the distance between adjacent first convex portions.

8. 5. The method for manufacturing a composite elastic member according to claim 1, wherein at least one of the sheets constituting the composite sheet is an elastic sheet that has elasticity in one direction and in which, when stretched in at least that one direction, high basis weight portions and low basis weight portions are alternately arranged in that one direction.

9. The method for manufacturing a composite elastic member according to claim 1 or 4, wherein the second convex portion applies pressure between the elastic members.

10. A pant-type diaper comprising a composite elastic member made by the method of claim 1 or 4.

11. A manufacturing apparatus used to manufacture a composite elastic member in which elastic regions that exhibit elastic stretchability and inelastic regions that do not substantially exhibit elastic stretchability are alternately formed in one direction, a pressure applying unit that applies pressure to a composite sheet having a plurality of sheets and a plurality of elastic members disposed between the sheets in a direction in which the elastic members extend while the composite sheet is conveyed between a first roll and a second roll each having a plurality of protrusions, thereby cutting the elastic members and forming the non-elastic region in the composite sheet, and also forming a front hole-preventing region at a boundary between the non-elastic region and an elastic region adjacent to the non-elastic region on the downstream side in the conveying direction, for preventing holes from being formed in the composite sheet; A manufacturing apparatus for a composite elastic member, wherein the first roll has a pressure section with a plurality of convex portions on a portion of the circumferential surface in the circumferential direction, the pressure section having a cutting area in which a plurality of first convex portions for forming the inelastic area are formed, and a pre-pressure area located in front of the cutting area in the rotation direction of the first roll and in which a plurality of second convex portions for pressurizing the composite sheet are formed, the front edge of the second convex portions in the rotation direction having a convex curved shape toward the rotation direction.

12. The manufacturing apparatus for a composite elastic member according to claim 11 , wherein the first convex portion and the second convex portion have different shapes in a plan view.

13. 13. The manufacturing apparatus for a composite elastic member according to claim 11 or 12, wherein the first convex portion has a front edge in the rotation direction that is a straight line extending along the direction of the rotation axis of the first roll.

14. A manufacturing apparatus used to manufacture a composite elastic member in which elastic regions that exhibit elastic stretchability and inelastic regions that do not substantially exhibit elastic stretchability are alternately formed in one direction, a pressure applying unit that applies pressure to a composite sheet having a plurality of sheets and a plurality of elastic members disposed between the sheets in a direction in which the elastic members extend while the composite sheet is conveyed between a first roll and a second roll each having a plurality of protrusions, thereby cutting the elastic members and forming the non-elastic region in the composite sheet, and also forming a front hole-preventing region at a boundary between the non-elastic region and an elastic region adjacent to the non-elastic region on the downstream side in the conveying direction, for preventing holes from being formed in the composite sheet; A composite elastic member manufacturing apparatus, wherein the first roll has a pressure section with a plurality of convex portions on a portion of the circumferential surface in the circumferential direction, the pressure section having a cutting area in which a plurality of first convex portions for forming the inelastic region are formed, and a pre-pressure area located in front of the cutting area in the rotation direction of the first roll and in which a plurality of second convex portions for pressurizing the composite sheet are formed, the first convex portions and the second convex portions having front edges in the rotation direction that are straight lines along the rotation axis direction of the first roll, and the length of the edge of the second convex portions is shorter than the length along the rotation axis direction of the first convex portions.

15. The pressure applying section has a post-pressure applying area located behind the cutting area in the rotation direction and having a plurality of third convex portions formed therein that apply pressure to the composite sheet, and the third convex portions have a rear edge in the rotation direction that has a convex curve facing away from the rotation direction, or a straight line along the rotation axis direction of the first roll that is shorter than the rear edge of the first convex portion in the rotation direction.

16. A manufacturing apparatus for a composite elastic member as described in claim 11 or 14, wherein the maximum value of the sum of the lengths of the second convex portions along the rotation axis direction of the first roll is smaller than the minimum value of the sum of the lengths of the first convex portions along the rotation axis direction.

17. 15. The manufacturing apparatus for a composite elastic member according to claim 11 or 14, wherein the distance between the second convex portion and the first convex portion adjacent to the second convex portion is shorter than the distance between adjacent first convex portions.

18. The manufacturing apparatus for a composite elastic member according to claim 11 or 14, wherein the second convex portion is arranged so as to apply pressure between the elastic members.

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