Wearable items

Abstract

To provide a wearing article capable of preventing detachment of a junction from a trunk body part.SOLUTION: A junction is formed in a sheet shape, one end part 3A in a width direction is overlapped to one surface of front / rear surfaces on a trunk body part and is deposited on the trunk body part through a first deposition part A, the other end part in the width direction is overlapped to the other surface of the front / rear surfaces on the trunk body part and is deposited on the trunk body part through a second deposition part B which is formed near the other end part relative to the first deposition part A, the first deposition part A and the second deposition part B are formed by ultrasonic wave deposition, the first deposition part A is formed to have deposition strength higher than that of the second deposition part B, and the second deposition part B is formed to have deposition strength lower than that of the first deposition part A at a degree at which the other end part of the junction can be peeled from the trunk body part.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a wearing article such as a diaper. [Background technology]

[0002] A disposable diaper described in Patent Document 1 is a conventional wearing article. This disposable diaper is composed of a front body section, a crotch section, and a back body section, and includes an absorbent body, a topsheet at least partially made of a liquid-permeable material and arranged to cover the surface of the absorbent body, a backsheet made of a liquid-impermeable material and arranged to cover the back surface of the absorbent body, and fastening tapes arranged to extend from each of the left and right side edges of the back body section. The fastening tapes have a structure in which a hook material of a mechanical fastener is attached to the surface of a base material made of nonwoven fabric. The fastening tapes are attached at their ends to the main body of the diaper (for example, the side flaps of the diaper), thereby forming a tape-type disposable diaper. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5091001 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the disposable diaper of Patent Document 1, the fastening tape is attached to the side sheet that constitutes the side flaps of the diaper with a hot melt adhesive. Therefore, for example, when a wearer who has applied Vaseline around their waist puts on the diaper, the Vaseline penetrates into the fastening tape through the side sheet and mixes with the hot melt adhesive that attaches the side tape to the fastening tape. This causes the hot melt adhesive to decompose and lose its adhesiveness, resulting in the fastening tape becoming detached from the side tape. This problem is not limited to the penetration of Vaseline, but is thought to occur when anything that has the property of decomposing the hot melt adhesive and causing it to lose its adhesiveness penetrates. Furthermore, this problem occurs not only when the disposable diaper is worn by a wearer, but also during storage and transportation of the disposable diaper.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a wearing article that can prevent a joining portion from coming off a main torso portion. [Means for solving the problem]

[0006] The present invention provides a garment comprising a front torso section covering the front side of a wearer, a rear torso section covering the rear side of the wearer, and a crotch section connecting the front torso section and the rear torso section and being placed between the crotch of the wearer, one of the front torso section and the rear torso section comprising a torso main body section covering the body of the wearer and a joining section provided at both ends of the torso main body section in a width direction that corresponds to the waist circumference of the wearer, the other of the front torso section and the rear torso section comprising a joined section to be joined to the joining section, and configured such that both ends of the front torso section and the rear torso section in the width direction are joined together by joining the joining section to the joined section, the joining section being configured in a sheet shape, and one end in the width direction being The wearable article is characterized in that a first weld is placed on one of the front or back surfaces of the torso main body portion and welded to the torso main body portion via a first weld, and the other end in the width direction is placed on the other of the front or back surfaces of the torso main body portion and welded to the torso main body portion via a second weld formed closer to the other end than the first weld, the first weld and the second weld being formed by ultrasonic welding, the first weld being formed with a stronger weld strength than the second weld, and the second weld being formed with a weaker weld strength than the first weld, to the extent that the other end of the joint can be peeled off from the torso main body portion.

[0007] According to the above configuration, one end of the joint in the width direction is superimposed on one of the front and rear surfaces of the trunk main body portion and welded to the trunk main body portion via the first welded portion, and the other end of the joint in the width direction is superimposed on the other of the front and rear surfaces of the trunk main body portion and welded to the trunk main body portion via the second welded portion formed closer to the other end than the first welded portion. Since the first welded portion and the second welded portion are formed by ultrasonic welding, for example, Even if Vaseline adheres to the first welded portion, the first welded portion and the second welded portion will not come apart, and the state in which the joint is welded to the main body portion will be maintained. Furthermore, the first welded portion is formed with a stronger weld strength than the second welded portion, and the second welded portion is formed with a weaker weld strength than the first welded portion to the extent that the other end of the joint can be peeled off from the main body portion. Therefore, the other end of the joint can be easily peeled off from the other surface of the front or back of the main body portion.

[0008] The first welded portion may have a larger welded area than the second welded portion.

[0009] According to this configuration, the welding area of ​​the first welded portion is larger than the welding area of ​​the second welded portion, so that the welding strength of the first welded portion can be made stronger than that of the second welded portion. [Effects of the Invention]

[0010] According to the present invention, one end of the joint in the width direction is overlapped on one of the front or back surfaces of the body main body portion and welded to the body main body portion via the first welded portion, and the other end of the joint in the width direction is overlapped on the other of the front or back surfaces of the body main body portion and welded to the body main body portion via the second welded portion.Since the first welded portion and the second welded portion are formed by ultrasonic welding, even if, for example, Vaseline adheres to the joint welded to the body main body portion, the first welded portion and the second welded portion will not come apart, and the joint will remain welded to the body main body portion, preventing the joint from coming off the body main body portion. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a plan view of a worn article according to an embodiment of the present invention in an unfolded state. [Figure 2] FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, showing a state before a welding step. [Figure 3] FIG. 3 is a diagram showing the state of the permanently fastened portion and the temporarily fastened portion after ultrasonic welding in the cross-sectional view shown in FIG. 2. [Figure 4] 1 is an explanatory diagram showing a manufacturing device and a manufacturing process for a worn article according to an embodiment of the present invention. [Figure 5] 1(a) to 1(g) are explanatory diagrams showing a manufacturing procedure for the worn article according to the present embodiment. [Figure 6] FIG. 10 is a cross-sectional view showing the state of the permanently fastened portion and the temporarily fastened portion when ultrasonically welded using a welding means of a different aspect from that of the embodiment in the wearing article of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of the wearing article of the present invention will be described below with reference to Figs. 1 to 3. The wearing article 1 is intended to be placed under the crotch of a wearer, such as an infant or an elderly person, and includes a diaper. The following description will be given taking a disposable diaper as an example of the wearing article 1. The disposable diaper serving as the wearing article 1 of this embodiment is not a pants-type diaper that can be put on by the wearer in advance, but rather a tape-type diaper that is in an unfolded state as shown in Fig. 1 before being worn and can be put on by the wearer by adhering predetermined portions together with tape or the like. The aforementioned "wearer" includes not only humans but also animals such as dogs and cats.

[0013] In the following description, the direction around the waist of the wearer, which is the left-right direction in FIG. 1, will be identified as the "width direction α." Furthermore, when the wearer puts on the wearing article 1, the direction extending from the front to the back of the wearer's crotch, which is the up-down direction in FIG. 1, will be identified as the "length direction β." In addition, the direction of the plane formed by the width direction α and the length direction β, which is the front-to-back direction of the paper surface in FIG. 1, will be identified as the "thickness direction γ."

[0014] The wearing article 1 comprises a front torso section 10 covering the front side (belly side) of the wearer, a rear torso section 11 covering the back side (back side) of the wearer, and a crotch section 12 connecting the front torso section 10 and the rear torso section 11 and positioned between the wearer's legs. One of the front torso section 10 and the rear torso section 11 comprises a torso main section 110 covering the wearer's body, and joint sections 3 provided at both ends 111 of the torso main section 110 in a width direction α, which is the direction around the waist of the wearer. In this embodiment, one of the front torso section 10 and the rear torso section 11 is the rear torso section 11. As shown in FIG. 1 , the wearing article 1 of this embodiment comprises a diaper main body 2 formed on a surface defined by the width direction α and the length direction β, and an adhesive tape 3.

[0015] As shown in Fig. 1, the diaper body 2 is composed of an absorbent body 21 that absorbs liquid, and a pair of strip-shaped sheet substrates 20 that overlap in a thickness direction γ (not shown in Fig. 1) so as to sandwich the absorbent body 21. The pair of strip-shaped sheet substrates 20 each include an inner sheet 200 that is disposed on the side that comes into contact with the wearer's skin, and an outer sheet 201 that is disposed on the opposite side of the inner sheet 200.

[0016] The inner sheet 200 is formed of a liquid-permeable sheet such as a nonwoven fabric. As shown in FIG. 2, the inner sheet 200 has a skin surface 200α that faces the wearer's skin and a non-skin surface 200β that is the surface opposite the skin surface 200α. As shown in FIG. 1, the inner sheet 200 of this embodiment has three-dimensional gathers 22 that prevent leakage of excrement. The three-dimensional gathers 22 are provided on the skin surface 200α, which is not shown in FIG. 1. The outer sheet 201 is formed of a liquid-impermeable sheet. The outer sheet 201 has an inner surface, not shown, that overlaps the inner sheet 200 from the non-skin surface 200β side, and an outer surface, not shown, that is placed on the outside when the wearer wears the garment 1.

[0017] As shown in Fig. 1, one side of the diaper body 2 in the longitudinal direction β corresponds to the front torso section 10, the other side corresponds to the rear torso section 11, and the portion between the two sides corresponds to the crotch section 12. In this embodiment, the crotch section 12 is formed to be shorter in the width direction α than the front torso section 10 and the rear torso section 11. The ends of the crotch section 12 in the width direction α are configured as gaps 23 through which the wearer's legs are passed.

[0018] The other of the front torso section 10 and the rear torso section 11 has a joinable portion to be joined with the joining portion 3. In this embodiment, the front torso section 10 has a joinable portion. That is, a joinable portion (not shown) is provided on the outer surface of the outer sheet 201 of the front torso section 10 in the width direction α. ​​This joinable portion is configured as an attachment portion to which an attachment portion 31 (described below) is attached. For example, in a hook-and-loop fastener composed of a male hook-and-loop fastener and a female hook-and-loop fastener, either one of the male hook-and-loop fastener or the female hook-and-loop fastener corresponds to the attachment portion in this embodiment.

[0019] The joining portion 3 is for joining the front torso portion 10 and the rear torso portion 11 in the waist direction of the wearer. The joining portion 3 is formed in a sheet shape. The joining portion 3 has one end portion 3A in the width direction α and the other end portion 3B in the width direction α. ​​In this embodiment, as shown in FIG. 3 , the one end portion 3A in the width direction α is overlaid on one of the front and back surfaces of the torso main body portion 110. Specifically, the one end portion 3A is overlaid on the non-skin surface 200β. Therefore, the joining portion 3 is welded to the torso main body portion 110 by welding the one end portion 3A in the width direction α to the non-skin surface 200β via a first weld portion A described below. Furthermore, the other end portion 3B in the width direction α is overlaid on the other of the front and back surfaces of the torso main body portion 110. Specifically, as shown in FIG. 2 , the other end portion 3B is overlaid on the skin surface 200α. Therefore, the joint portion 3 is welded to the trunk main body portion 110 via a second weld portion B, which will be described later, which is formed closer to the other end portion 3B than the first weld portion A.

[0020] In this embodiment, the joining portion 3 is configured as an adhesive tape 3. This adhesive tape 3 is attached to the diaper main body 2. As shown in FIGS. 1 and 3 , the adhesive tape 3 in this embodiment is attached to the diaper main body 2 in a converged state P in which a final fastening portion 300 and a temporary fastening portion 301 (described later) are welded to the inner sheet 200. Specifically, in the converged state P in this embodiment, the surface of the final fastening portion 300 is welded to the non-skin side 200β of the inner sheet 200, and the surface of the temporary fastening portion 301 is welded to the skin side 200α of the inner sheet 200. In addition, in the converged state P, the welded temporary fastening portion 301 of the adhesive tape 3 can be peeled off from the inner sheet 200 to expand into an expanded state Q in which the final fastening portion 300 is welded to the inner sheet 200, as shown in FIG. 1 . Note that in the expanded state Q, the temporary fastening portion 301 protrudes from the end 111 of the trunk main body portion 110 in the width direction α. The adhesive tape 3 of this embodiment includes a tape substrate 30 and an adhesive portion 31 provided on the tape substrate 30, as shown in FIG.

[0021] The tape substrate 30 is made of a sheet such as a nonwoven fabric. As shown in FIG. 2, the tape substrate 30 of this embodiment is thicker than the inner sheet 200. The tape substrate 30 also includes a permanent fastening portion 300 and a temporary fastening portion 301. In the tape substrate 30 of this embodiment, one side in the width direction α of the tape substrate 30 is configured as the permanent fastening portion 300, and the other side in the width direction α is configured as the temporary fastening portion 301, with an imaginary line in the length direction β (not shown) as the boundary. Therefore, in the tape substrate 30, the permanent fastening portion 300 and the temporary fastening portion 301 are folded back in the width direction α, with the imaginary line in the length direction β (not shown) as the boundary.

[0022] The main fastening portion 300 is ultrasonically welded to the inner sheet 200 with its front surface in surface contact with the non-skin surface 200β. Therefore, the main fastening portion 300 in this embodiment overlaps one of the front and back surfaces of the trunk main body 110. In addition, the back surface of the main fastening portion 300 is in surface contact with the inner surface of the outer sheet 201 in the state shown in FIG.

[0023] The temporary fastening portion 301 is ultrasonically welded to the inner sheet 200 with its surface in surface contact with the skin surface 200α. Therefore, in this embodiment, the temporary fastening portion 301 overlaps the other of the front and back surfaces of the trunk main body 110. As shown in Fig. 1 , the temporary fastening portion 301 is continuous with the permanent fastening portion 300 in the width direction α, across an imaginary line in the length direction β (not shown). In this embodiment, the temporary fastening portion 301 is longer than the permanent fastening portion 300 in the width direction α.

[0024] As shown in FIG. 1 , the temporary fixing portion 301 includes a folded portion 3010 configured as an end portion on the free end side in the width direction α, and a connecting portion 3011 connecting the folded portion 3010 and the final fixing portion 300. An attachment portion 31 is attached to the surface of the folded portion 3010. The folded portion 3010 is folded back so that the attachment portion 31 abuts against the surface of the connecting portion 3011. As shown in FIG. 1 , the folded portion 3010 of this embodiment has a width in the length direction β that is shorter than that of the connecting portion 3011. The connecting portion 3011 is positioned closer to the final fixing portion 300 in the width direction α than the folded portion 3010. The connecting portion 3011 of this embodiment is longer in the width direction α than the folded portion 3010. In this embodiment, as shown in Fig. 2, when the surface of the temporary fastening portion 301 is placed on the skin surface 200α of the inner sheet 200, the temporary fastening portion 301 is adhered to an adhesive portion X that has been applied in advance to the end portion 111 in the width direction α of the trunk main body portion 110. Specifically, as shown in Fig. 2, the folded portion 3010 is folded back so that the attachment portion 31 abuts against the surface of the connecting portion 3011, and the back surface of the folded portion 3010 is adhered to the adhesive portion X. In this embodiment, the adhesive portion X is a releasable hot melt adhesive.

[0025] The attachment portion 31 is used when attaching the front torso section 10 and the rear torso section 11 in the waist direction. This attachment portion 31 is attached to an attachment receiving portion provided on the outer surface of the front torso section 10. As shown in FIGS. 1 and 2, the attachment portion 31 in this embodiment is provided on the surface of the folded-back portion 3010. For example, the attachment portion 31 corresponds to either the male hook-and-loop fastener or the female hook-and-loop fastener in a hook-and-loop fastener composed of a male hook-and-loop fastener and a female hook-and-loop fastener. The attachment receiving portion in this embodiment is a male hook-and-loop fastener.

[0026] The first welded portion A and the second welded portion B are formed by ultrasonic welding. The first welded portion A is formed between one end portion 3A of the joint portion 3 in the width direction α and one of the front and back surfaces of the trunk main body portion 110. As shown in Fig. 3, the first welded portion A in this embodiment is formed by ultrasonically welding the main fastening portion 300 and the inner sheet 200 in the thickness direction γ with the surface of the main fastening portion 300 in surface contact with the non-skin surface 200β. That is, the first welded portion A in this embodiment is formed between the main fastening portion 300 and the inner sheet 200.

[0027] The second welded portion B is formed between a portion of the joint 3 that overlaps the other front or back surface of the trunk main body 110, which portion faces one end 3A in the width direction α in the front or back direction, and the other front or back surface of the trunk main body 110. As shown in Fig. 3 , the second welded portion B in this embodiment is formed by ultrasonically welding a connecting portion 3011 of the temporary fastening portion 301 overlapping the bare surface 200α, which is closer to the final fastening portion 300 in the thickness direction γ than the portion where the folded-back portion 3010 and the connecting portion 3011 overlap, between the bare surface 200α and a widthwise intermediate portion 3011α that faces the final fastening portion 300 in the thickness direction γ. That is, the second welded portion B in this embodiment is formed between the widthwise intermediate portion 3011α and the bare surface 200α.

[0028] As shown in FIG. 3 , the first welded portion A and the second welded portion B are arranged opposite each other in the front-to-back direction. In this embodiment, the first welded portion A and the second welded portion B are arranged opposite each other in the thickness direction γ, sandwiching the inner sheet 200 therebetween. The first welded portion A is formed with a stronger weld strength than the second welded portion B. In this embodiment, the first welded portion A is formed with a weld strength sufficient to integrate the surface of the main fastening portion 300 with the non-skin surface 200β of the inner sheet 200 so that it does not come off. On the other hand, the second welded portion B is formed with a weaker weld strength than the first welded portion A so that the other end 3B of the joint 3 can be peeled from the trunk main body portion 110. That is, the second welded portion B is formed with a weld strength sufficient to peel the widthwise intermediate portion 3011α from the skin surface 200α so that the adhesive tape 3 can be expanded from the convergent state P to the expanded state Q. The welding strength can be adjusted by appropriately adjusting the welding time, pressure, ultrasonic output, etc.

[0029] The joining portion 3 is joined to the joining target portion, thereby joining both end portions of the front torso section 10 and the rear torso section 11 in the width direction α. ​​In this embodiment, when the diaper body 2 is folded in the length direction β to face the front torso section 10 and the rear torso section 11, the attachment portion 31 is attached to the attachment target portion provided on the outer surface of the outer sheet 201. In this way, the joining portion 3 is joined to the attachment target portion.

[0030] Next, the manufacturing apparatus 4 for the worn article 1 according to one embodiment of the present invention will be described with reference to FIGS.

[0031] The manufacturing apparatus 4 for the wearing article 1 is an apparatus for manufacturing the wearing article 1. The manufacturing apparatus 4 for the wearing article 1 includes a positioning means 40, a folding means 41, and a welding means 42. As shown in Fig. 4, the manufacturing apparatus 4 for the wearing article 1 of this embodiment is configured by providing the positioning means 40, the folding means 41, and the welding means 42 to a conveying device that flows from upstream to downstream. In this embodiment, as shown in Fig. 4, a conveying device Y that conveys the adhesive tape 3 and a conveying device Z that conveys the inner sheet 200 as the strip-shaped sheet substrate 20 merge together.

[0032] In the following, the description will begin with the point where the conveying device Z that conveys the inner sheet 200 as the strip-shaped sheet substrate 20 and the conveying device Y that conveys the adhesive tape 3 join together. That is, the description will begin with the positioning means 40. In the conveying device Z that conveys the inner sheet 200, as shown in FIG. 5(d), an adhesive section X is applied in advance to the end 111 in the width direction α of the trunk main body section 110. In addition, in the conveying device Y that conveys the adhesive tape 3, as shown in FIGS. 5(a) to (c), the steps of attaching an adhesive section 31 to the tape substrate 30, cutting off multiple adhesive tapes 3, and folding back the fold-back section 3010 are performed.

[0033] The positioning means 40 is used to position the joint portion 3 relative to the strip-shaped sheet substrate 20 flowing from upstream to downstream of the conveyor. Here, "positioning" means overlapping and releasably fixing the strip-shaped sheet substrate 20 and the adhesive tape 3 serving as the joint portion 3 to each other. In this embodiment, "positioning" means overlapping and adhering the end 111 in the width direction α of the trunk main body portion 110 on the surface 200α of the inner sheet 200 to the front side of the temporary fastening portion 301, thereby releasably fixing the inner sheet 200 and the adhesive tape 3, as shown in FIG. 5(e). Specifically, the back surface of the folded-back portion 3010 and the surface 200α of the inner sheet 200 are releasably fixed to each other.

[0034] The positioning unit 40 includes an adhesive tape transport unit 401 and an inner sheet transport unit 400. As shown in FIG. 4, the adhesive tape transport unit 401 includes a transport main body 401α that advances the adhesive tape 3 downstream and a drive member 401β that moves the transport main body 401α. In this embodiment, the transport belt 401α configured as the transport main body 401α moves due to the rotation of a roll 401β configured as the drive member 401β, thereby advancing the adhesive tape 3 placed on the transport belt 401α downstream. As shown in FIG. 4, the inner sheet transport unit 400 includes a transport main body 400α that advances the inner sheet 200 downstream and a drive member 400β that moves the transport main body 400α. In this embodiment, as shown in FIG. 4, the roll 400β configured as the drive member 400β rotates clockwise, thereby moving the transport belt 400α as the transport main body 400α that is wound around the roll 400β clockwise. Therefore, the inner sheet 200 placed on the conveyor belt 400α advances downstream in the conveying direction.

[0035] In the positioning means 40 of this embodiment, as shown in FIG. 4, a roll 401β serving as an adhesive tape conveying portion 401 is disposed on the inner sheet conveying portion 400. That is, the downstream side of the adhesive tape conveying portion 401 merges with the conveying belt 400α of the inner sheet conveying portion 400. Specifically, the left-right direction in FIG. 4 is the conveying direction, and the adhesive tape conveying portion 401 merges with the conveying belt 400α disposed along the conveying direction from the upper side in FIG. 4. Therefore, as shown in FIG. 5(e), the adhesive tape 3 and the inner sheet 200 overlap. Here, in the positioning means 40 of this embodiment, the end 111 of the trunk main body portion 110 in the width direction α and the temporary fastening portion 301 of the adhesive tape 3 overlap. Specifically, the bare surface 200α of the inner sheet 200 and the back surface of the folded-back portion 3010 are bonded via an adhesive portion X previously applied to the end 111 of the trunk main body portion 110 in the width direction α. In this embodiment, when the conveying device Y for the adhesive tape 3 and the conveying device Z for the strip-shaped sheet substrate 20 are joined together and the inner sheet 200 and the adhesive tape 3 overlap, pressure is applied by the roll 401β.

[0036] The folding means 41 folds one end 3A of the joint 3 positioned by the positioning means 40 so as to overlap one of the front and rear surfaces of the trunk main body 110. As shown in FIG. 4 , the folding means 41 includes an endless conveyor 410 and a drive member 411 that moves the conveyor 410. In this embodiment, the folding belt 410 serving as the conveyor 410 is arranged along the conveyance direction and is twisted so that its angle gradually changes from the upstream side to the downstream side in the conveyance direction. The conveyor 410 is also configured to rotate around the roller 411 that serves as the drive member 411. Therefore, the folding belt 410 moves along the conveyance direction and folds back the adhesive tape 3. Therefore, the folding belt 410 moves in the conveyance direction due to the driving of the drive member 411, and one end 3A of the joint 3 moves in the conveyance direction while contacting the folding belt 410. As a result, one end 3A of the joint 3 overlaps one surface of the trunk main body 110. 5(f), the main fastening portion 300 is folded back along the edge of the inner sheet 200 in the width direction α so that the surface of the main fastening portion 300 overlaps the non-skin side 200β of the inner sheet 200. The folding means 41 in this embodiment is disposed downstream of the positioning means 40.

[0037] The welding means 42 clamps and ultrasonically welds the overlapping portions of the front and back surfaces of the joint portion 3, with one end 3A of the joint portion 3 in the width direction α overlapping one of the front and back surfaces of the end portion of the trunk main body 110 in the width direction α and the other end 3B of the joint portion 3 in the width direction α overlapping the other of the front and back surfaces. As shown in FIG. 4, the welding means 42 includes a roll-shaped anvil 420 and a horn 421. The anvil 420 includes a cylindrical roll body 420α and a plurality of protrusions 420β provided on the outer circumferential surface of the roll body 420α. In this embodiment, the protrusions 420β protrude from the outer circumferential surface of the roll body 420α, and have a rectangular shape with their tip end protruding perpendicularly from the outer circumferential surface of the roll body 420α, as shown in FIGS. 2 and 3. The horn 421 includes a horn body 421β and a vibrating device 421α provided on the horn body 421β. 2, in the thickness direction γ, anvil 420 is arranged on one of the front and rear surfaces of trunk main body 110, and horn 421 is arranged on the other of the front and rear surfaces of trunk main body 110. Protrusion 420β and the tip surface of horn main body 421β are arranged to face each other.

[0038] In the welding means 42 of this embodiment, the vibration device 421α vibrates, thereby outputting ultrasonic vibrations from the tip surface of the horn body 421β in a direction toward the anvil 420. That is, in this embodiment, the horn 421 outputs ultrasonic waves, and the anvil 420 receives the ultrasonic waves. Here, in the welding means 42 of this embodiment, the ultrasonic waves are adjusted so that the permanently fastened portion 300 is welded to the inner sheet 200 more strongly than the temporarily fastened portion 301. Furthermore, in the welding means 42, the ultrasonic waves are adjusted so that the widthwise intermediate portion 3011α is welded so as to be peelable from the inner sheet 200. Note that the welding means 42 of this embodiment is disposed downstream of the folding means 41.

[0039] Next, a method for manufacturing the wearing article 1 will be described with reference to Figures 2 to 5. The method for manufacturing the wearing article 1 includes a positioning step, a folding step, and a welding step. In this embodiment, as shown in Figures 5(a) to 5(c), as a step prior to the positioning step, an adhesive area 31 is applied to the folded-back portion 3010 of the tape substrate 30, which serves as the joining portion 3, and then the folded-back portion 3010 is folded back to leave the temporary fastening portion 301 in a folded-back state. Furthermore, as shown in Figure 5(d), an adhesive area X is applied to both end portions 111 of the body portion 110 in the width direction α on the skin surface 200α of the inner sheet 200.

[0040] The positioning step is a step of overlapping and adhering the other end 3B of the joint portion 3 to the other surface of the strip-shaped sheet substrate 20 to position it. This positioning step is performed by a positioning means 40 shown in FIG. 4. Specifically, as shown in FIG. 4, in the positioning step of this embodiment, the rotation of a roll 401β serving as the adhesive tape transport unit 401 moves the transport belt 401α, causing the adhesive tape 3 placed on the transport belt 401α to flow downstream. Then, as shown in FIG. 5(e), the adhesive tape 3 that has flowed downstream of the adhesive tape transport unit 401 is placed on the inner sheet 200 that is flowing downstream by the inner sheet transport unit 400. Here, in this embodiment, the temporary fastening portion 301 of the adhesive tape 3 is placed on the skin surface 200α side of the inner sheet 200. Specifically, at the end 111 of the width direction α of the trunk main body portion 110, the final fastening portion 300 is placed so as to protrude from the edge of the trunk main body portion 110 in the width direction α. In the positioning step of this embodiment, the back surface of the folded-back portion 3010 and the bare surface 200α of the inner sheet 200 are bonded by the adhesive portion X applied to the end portion 111 in the width direction α of the trunk main body portion 110. That is, in the positioning step, the back surface of the folded-back portion 3010 and the bare surface 200α of the inner sheet 200 are releasably fixed to each other in the thickness direction γ.

[0041] The folding step is performed between the positioning step and the welding step. This folding step is performed by the folding means 41 in FIG. 4. In the folding step, one end 3A of the joint portion 3 positioned in the positioning step is folded back so as to overlap one surface of the strip-shaped sheet substrate 20. The folding step of this embodiment includes a folding step in which the final fastening portion 300 is folded along the edge of the trunk main body portion 110 in the width direction α, and an overlapping step in which the final fastening portion 300 folded in the folding step is overlapped on the non-skin surface 200β of the inner sheet 200. That is, as shown in FIGS. 4 and 5(f), in the folding step of this embodiment, the folding belt 410 is twisted so as to gradually change its angle, and first, the final fastening portion 300 of the adhesive tape 3 is folded toward the non-skin surface 200β of the inner sheet 200 along the edge of the trunk main body portion 110 in the width direction α. Thereafter, as the folding belt 410 twists, the main fastening portion 300 continues to be folded, and as shown in Figures 2 and 5(f), a stacking process is carried out in which the surface of the main fastening portion 300 and the non-skin surface 200β of the inner sheet 200 are stacked in the thickness direction γ.

[0042] In the welding process, one end 3A of the joining portion 3 in the width direction α is overlapped on one of the front and back surfaces of one end 111 in the width direction α of the long, strip-shaped sheet substrate 20, and the other end 3B in the width direction α is overlapped on the other of the front and back surfaces. The overlapping portions of the front and back surfaces are then clamped and ultrasonically welded. The welding process of this embodiment is performed after the folding process. The welding process is performed by welding means 42 shown in FIG. 4. Specifically, in the welding process of this embodiment, ultrasonic welding is performed with an anvil 420 pressed against the non-skin surface 200β side of the inner sheet 200 and a horn 421 pressed against the skin surface 200α side. Specifically, as shown in FIG. 2, on the non-skin surface 200β side of the inner sheet 200, the tip of the protrusion 420β is pressed against the portion where the non-skin surface 200β of the inner sheet 200 and the main fastening portion 300 overlap in the thickness direction γ. Meanwhile, on the skin surface 200α side of the inner sheet 200, the tip surface of the horn body 421β is pressed against the area where the skin surface 200α of the inner sheet 200 and the widthwise intermediate portion 3011α of the inner sheet 200 overlap. In this manner, the inner sheet 200 and the adhesive tape 3 are clamped between the anvil 420 and the horn 421, and ultrasonic waves are output from the horn 421 toward the anvil 420, thereby performing ultrasonic welding. In this embodiment, the protrusion 420β and the tip surface of the horn body 421β are arranged to face each other. Therefore, when the vibrating device 421α vibrates, ultrasonic vibrations are output from the tip surface of the horn body 421β, and the protrusion 420β receives the ultrasonic vibrations from the horn 421 via the joining portion 3 and the inner sheet 200. Therefore, between the protrusion 420β and the horn body 421β, the overlapping portion between the skin surface 200α of the inner sheet 200 and the widthwise intermediate portion 3011α is subjected to ultrasonic vibrations and ultrasonically welded, thereby forming a second welded portion B between the skin surface 200α and the widthwise intermediate portion 3011α. Also, the overlapping portion between the surface of the final fastening portion 300 and the non-skin surface 200β of the inner sheet 200 is ultrasonically welded, thereby forming a first welded portion A between the final fastening portion 300 and the non-skin surface 200β. Therefore, as shown in Figures 3 and 5(g), the final fastening portion 300 and the temporary fastening portion 301 are welded to the inner sheet 200, and the adhesive tape 3 is in a converged state P.

[0043] In the welding process, one end 3A of the joint 3 is welded with a stronger welding strength than the other end 3B. The other end 3B is welded with a weaker welding strength than the one end 3A, so that it can be peeled off from the strip-shaped sheet substrate 20. Here, in the welding means 42 of this embodiment, the ultrasonic waves are adjusted so that the permanent fastening portion 300 is welded to the inner sheet 200 with a stronger welding strength than the temporary fastening portion 301. In addition, in the welding means 42, the ultrasonic waves are adjusted so that the widthwise intermediate portion 3011α is welded so that it can be peeled off from the inner sheet 200. Therefore, in this embodiment, the first welded portion A is configured to have a stronger welding strength than the second welded portion B. Therefore, the permanent fastening portion 300 is welded to the inner sheet 200 with a welding strength strong enough to integrate its surface with the non-skin surface 200β and prevent it from coming off. On the other hand, the widthwise intermediate portion 3011α is welded to the inner sheet 200 with a welding strength sufficient to allow peeling from the skin surface 200α.

[0044] As described above, according to the wearing article 1 of this embodiment, the first welded portion A is configured to have a stronger weld strength than the second welded portion B. Therefore, the permanent fastening portion 300 is less likely to come off the inner sheet 200 than the temporary fastening portion 301. Specifically, the first welded portion A is formed with a welding strength sufficient to integrate the surface of the permanent fastening portion 300 with the non-skin surface 200β of the inner sheet 200 so that it does not come off. Therefore, for example, the wearer can use the wearing article 1 with confidence without worrying about the permanent fastening portion 300 coming off the inner sheet 200.

[0045] The second welded portions B are formed with a weaker weld strength than the first welded portions A, so that the temporary fastening portions 301 can be peeled from the skin-contact surface 200α of the inner sheet 200. Specifically, the second welded portions B are formed with a weld strength that allows the widthwise intermediate portions 3011α to be peeled from the skin-contact surface 200α. Therefore, when the temporary fastening portions 301 are peeled from the diaper main body 2 and the diaper is unfolded from the converged state P in which the permanent fastening portions 300 and the temporary fastening portions 301 are welded to the inner sheet 200 to the unfolded state Q, the temporary fastening portions 301 are easily peeled from the diaper main body 2.

[0046] In the wearing article 1 of this embodiment, the temporary fastening parts 301 are adhered to the inner sheet 200 not only by ultrasonic welding but also via adhesive parts X applied to the skin surface 200α. Therefore, for example, before the wearing article 1 is used, it is possible to prevent the temporary fastening parts 301 from peeling off from the inner sheet 200.

[0047] 4, in the manufacturing apparatus 4 for the wearing article 1 of this embodiment, the folding means 41 is disposed downstream of the positioning means 40. In addition, the welding means 42 is disposed downstream of the folding means 41. Therefore, in the manufacturing apparatus 4 for the wearing article 1 of this embodiment, the positioning step by the positioning means 40 and the folding step by the folding means 41 can be performed, followed by the welding step by the welding means 42.

[0048] Furthermore, the manufacturing method of the worn article 1 according to the first embodiment comprises a front torso section 10 covering the front side of a wearer, a rear torso section 11 covering the back side of the wearer, and a crotch section 12 connecting the front torso section 10 and the rear torso section 11 and positioned between the crotch of the wearer, one of the front torso section 10 and the rear torso section 11 comprising a torso main body section 110 covering the body of the wearer and joining sections 3 provided at both end portions 111 of the torso main body section 110 in a width direction α that is the direction around the waist of the wearer, and the other of the front torso section 10 and the rear torso section 11 comprising joined sections to be joined to the joining sections 3, and by joining the joining sections 3 to the joined sections, both end portions 111 of the front torso section 10 and the rear torso section 11 in the width direction α are joined to each other. The method for manufacturing a wearing article (1) configured so that the waist portion (110) is joined includes a welding step of overlapping one end (3A) in the width direction (α) of the joining portion (3) with one of the front and back surfaces of one end (111) in the width direction (α) of a long, strip-shaped sheet substrate (20) that forms the waist body portion (110) and overlapping the other end (3B) in the width direction (α) with the overlapping portions of the front and back surfaces clamped and ultrasonically welding them together, in which in the welding step, the one end (3A) of the joining portion (3) is welded with a stronger welding strength than the other end (3B) side, and the other end (3B) is welded with a weaker welding strength than the one end (3A) to an extent that it can be peeled off from the strip-shaped sheet substrate (20). Therefore, the one end (3A) of the joining portion (3) is more difficult to detach from the strip-shaped sheet substrate (20) than the other end (3B), and the other end (3B) of the joining portion (3) is more easily peeled off from the strip-shaped sheet substrate (20).

[0049] Furthermore, in the welding step of this embodiment, ultrasonic welding is performed by outputting ultrasonic waves from the horn 421 while the inner sheet 200 and the adhesive tape 3 are held between the anvil 420 and the horn 421. Specifically, in the welding step of this embodiment, the overlapping portion between the skin surface 200α of the inner sheet 200 and the widthwise middle portion 3011α is ultrasonically welded, and the overlapping portion between the surface of the main fastening portion 300 and the non-skin surface 200β of the inner sheet 200 is ultrasonically welded. Therefore, the welding step of this embodiment simultaneously welds both the skin surface 200α and the non-skin surface 200β of the inner sheet 200, which can contribute to shortening the manufacturing time.

[0050] Furthermore, in this embodiment, a positioning step of positioning the joint 3 relative to the strip-shaped sheet substrate 20 is performed before the welding step, and the welding step is performed with the joint 3 positioned on the strip-shaped sheet substrate 20 in the positioning step. This prevents the joint 3 from coming off the strip-shaped sheet substrate 20, allowing the welding step to be performed stably. Here, the positioning step in this embodiment is a step of positioning the other end 3B of the joint 3 by overlapping and adhering it to the other surface of the strip-shaped sheet substrate 20. Therefore, in the positioning step, the other end 3B of the joint 3 is overlapped and adhered to the other surface of the strip-shaped sheet substrate 20, thereby fixing the strip-shaped sheet substrate 20 and the joint 3.

[0051] In this embodiment, the temporary fastening portion 301 of the adhesive tape 3 is longer than the final fastening portion 300 in the width direction α. ​​In the positioning step, the adhesive tape 3 is placed on the strip-shaped sheet substrate 20 so that the final fastening portion 300 extends beyond the edge of the trunk main body 110 in the width direction α. ​​Therefore, in the positioning step of this embodiment, the portion of the adhesive tape 3 that extends beyond the end 111 of the trunk main body 110 in the width direction α can be shortened.

[0052] The manufacturing method of the wearing article 1 of this embodiment also includes a folding step between the positioning step and the welding step, in which the joining portion 3 is folded back so that one end 3A of the joining portion 3 positioned in the positioning step is overlapped with one surface of the strip-shaped sheet substrate 20. Therefore, in the process of manufacturing the wearing article 1, by folding back the joining portion 3 in the folding step so that one end 3A of the joining portion 3 is overlapped with one surface of the strip-shaped sheet substrate 20, it is possible to prevent the one end 3A of the joining portion 3 from flapping, or causing other folding defects.

[0053] The worn article is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention.

[0054] In the above embodiment, a case has been described in which one of the forward section 10 and the rear section 11 is the rear section 11 and the rear section 11 has the joining section 3, but this is not limiting, and one of the forward section 10 and the rear section 11 may be the forward section 10 and the forward section 10 may have the joining section 3. In this case, the other of the forward section 10 and the rear section 11 is the rear section 11, and therefore the rear section 11 has the joining section.

[0055] In the above embodiment, the widthwise intermediate portion 3011α and the bare surface 200α are ultrasonically welded together, and the second welded portion B is formed between the widthwise intermediate portion 3011α and the bare surface 200α. However, this is not limiting, and for example, the entire area of ​​the temporary fastening portion 301 in the width direction α may be ultrasonically welded between the bare surface 200α and the bare surface 200α, and the second welded portion B may be formed between the entire area of ​​the temporary fastening portion 301 in the width direction α and the bare surface 200α. In other words, the second welded portion B may be formed closer to the other end 3B than the first welded portion A.

[0056] Furthermore, in the welding means 42 of the above embodiment, the ultrasonic waves are adjusted so that the permanent fastening portions 300 are welded to the inner sheet 200 more strongly than the temporary fastening portions 301. However, this is not limiting, and it is also possible to strengthen the welding of the permanent fastening portions 300 and weaken the welding of the temporary fastening portions 301, for example, by providing a difference in thickness between the permanent fastening portions 300 and the temporary fastening portions 301 in the thickness direction γ without adjusting the ultrasonic waves.

[0057] In the above embodiment, when the temporary fastening portion 301 is placed on the surface 200α of the body during the positioning step, the adhesive portion X adheres the back surface of the folded-back portion 3010 to the surface 200α of the body. However, this is not limiting. For example, the adhesive between the surface 200α of the body and the back surface of the folded-back portion 3010 may be performed by heat sealing. In this case, it is possible to eliminate the need to adhere the adhesive portion X to the end of the body main body portion 110 in the width direction α before the positioning step. Alternatively, the adhesive portion 31 may be used to adhere the surface 200α of the body and the surface of the temporary fastening portion 301. In this case, the folded-back portion 3010 is not folded back so that the adhesive portion 31 abuts against the surface of the connecting portion 3011, and the adhesive portion 31 may be of a nature that allows it to be reattached after being peeled off. Furthermore, for example, in the positioning step, the adhesive tape 3 may be prevented from separating from the inner sheet 200 by using a vacuum to keep the temporary fastening portion 301 overlapped on the inner sheet 200.

[0058] In the above embodiment, the protrusion 420β has a rectangular shape with its tip end protruding perpendicularly from the outer circumferential surface of the roll body 420α, as shown in FIGS. 2 and 3 . However, the present invention is not limited to this. For example, as shown in FIG. 6 , the protrusion 420β may have a tapered shape with its tip end narrowing from the base end to the tip end. In this case, when ultrasonic welding is performed using a welding means 42 including the protrusion 420β, the welding area of ​​the first welded portion A is larger than the welding area of ​​the second welded portion B. Therefore, the welding strength of the first welded portion A can be made stronger than the welding strength of the second welded portion B. This allows for a stronger weld between one end 3A of the joint 3 and the strip-shaped sheet substrate 20, and a weaker weld between the other end 3B of the joint 3 and the strip-shaped sheet substrate 20. Regarding the welding area between the first welded portion A and the second welded portion B, for example, the welding area of ​​the second welded portion B may be larger than the welding area of ​​the first welded portion A, or the welding area of ​​the first welded portion A and the welding area of ​​the second welded portion B may be the same. [Explanation of symbols]

[0059] 1: Wearing article, 10: Front torso portion, 11: Rear torso portion, 110: Main torso portion, 111: End portion in width direction, 12: Crotch portion, 2: Diaper body, 20: Strip-shaped sheet substrate, 200: Inner sheet, 200α: Skin side, 200β: Non-skin side, 201: Outer sheet, 21: Absorbent body, 22: Three-dimensional gathers, 23: Gap portion, 3: Joint portion, 3A: One end portion, 3B: Other end portion, 3: Adhesive tape, 30: Tape substrate, 300: Final fastening portion, 301: Temporary fastening portion, 3010: Folded portion, 3011: Connecting portion, 3011α: Middle portion in width direction, 31: Adhesive portion, 4: Manufacturing apparatus, 40 : Positioning means, 400: Inner sheet conveying section, 400α: Conveyor main body, 400β: Driving member, 401: Adhesive tape conveying section, 401α: Conveyor main body, 401β: Driving member, 41: Folding means, 410: Conveyor, 411: Driving member, 42: Welding means, 420: Anvil, 420α: Roll main body, 420β: Protrusion, 421: Horn, 421α: Vibrating device, 421β: Horn main body, A: First welded portion, B: Second welded portion, Q: Expanded state, P: Converged state, X: Adhesion portion, Y: Conveyor device, Z: Conveyor device, α: Width direction, β: Length direction, γ: Thickness direction

Claims

[Claim 1] a front torso section covering the front side of a wearer, a rear torso section covering the rear side of the wearer, and a crotch section connecting the front torso section and the rear torso section and being placed between the crotch of the wearer; One of the front torso section and the rear torso section includes a torso main body section that covers the body of a wearer, and joint sections provided at both ends of the torso main body section in a width direction that is a direction around the waist of the wearer, the other of the forward section and the aft section includes a joinable portion to be joined with the joining portion, the joining portion includes a sheet-like tape substrate and an attachment portion provided on the tape substrate, the attachment portion is joined to the joined portion, thereby joining both widthwise end portions of the forward trunk section and the rear trunk section to each other, the joining portion is configured in a sheet shape, one end portion in the width direction is superimposed on one of the front and rear surfaces of the trunk main body portion and welded to the trunk main body portion via a first welded portion, and the other end portion in the width direction is superimposed on the other of the front and rear surfaces of the trunk main body portion and welded to the trunk main body portion via a second welded portion formed closer to the other end portion than the first welded portion, the first welded portion and the second welded portion are formed by directly welding the tape substrate to the trunk main body portion by ultrasonic welding, and are positioned opposite each other in the front-back direction; The first welded portion is formed to have a stronger weld strength, which is a strength that makes it less likely to peel off, than the second welded portion, The second welded portion is formed to have a weaker weld strength than the first welded portion, so that the other end of the joint can be peeled away from the main torso portion.

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