Manufacturing method of underpants-type absorbent article and manufacturing device of underpants-type absorbent article

Abstract

To provide a manufacturing method of underpants-type absorbent articles capable of efficiently forming a cutting guide part for guiding users to cut a member and sticking materials together.SOLUTION: A manufacturing method of an underpants-type absorbent article (1) including a waistline part (20 and 30) and a fastening part (5), includes: a conveying step (S1) of conveying a continuous waistline member (20L) for forming the waistline part (20) in a conveying direction; and a welding step (S6) of welding a base end (5t) of the fastening part (5) to the continuous waistline member (20L) to form a welded portion (F1) as a cutting guide part (40) in the continuous waistline member (20L).SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a pant-type absorbent article and a manufacturing apparatus for a pant-type absorbent article.

Background Art

[0002] Conventionally, in a manufacturing line for manufacturing absorbent articles and the like, a method of joining materials to each other by performing a welding process such as ultrasonic welding on a material sheet is known. For example, Patent Document 1 discloses an ultrasonic processing apparatus and method for continuously joining sanitary materials by pressing with ultrasonic vibration.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the ultrasonic processing method disclosed in Patent Document 1, by increasing the time during which the ultrasonic welding unit acts on the material, the time of the thermal composite action is extended so as to obtain a good thermal composite effect. However, there is no particular disclosure regarding a process or method in which the material is easily cut based on the site where the welding process is performed.

[0005] For example, when manufacturing an absorbent article in the form of pants in its initial state of the product, having a fastening part including an engaging member on one side or both sides in the left - right direction of the article, and being able to form a leg - opening by cutting a part of the waist - surrounding part and engaging the fastening part with the waist - surrounding part, there is a step of welding the fastening part to the material that will become the waist - surrounding part. By this step, the fastening part is fixed to the waist - surrounding part. However, in the case of the above - mentioned absorbent article, during use, by pulling the fastening part, a part of the waist - surrounding part is cut and opened in the vertical direction, so a device that is easy to cut (easy to break) is required. For example, when making it easy to break by providing a perforation or the like, such a structure has to be formed in a process separate from the welding process, so an efficient method is required.

[0006] The present invention has been made in view of the above - mentioned problems, and its object is to provide a method for manufacturing a pants - type absorbent article that can efficiently form a cutting - guiding part for guiding a user to cut a member and bond materials.

Means for Solving the Problems

[0007] The main invention for achieving the above object is a method for manufacturing a pants - type absorbent article including a waist - surrounding part and a fastening part, comprising a conveying step of conveying the waist - surrounding continuous member for forming the waist - surrounding part in a conveying direction, and a welding step of welding a base end part of the fastening part to the waist - surrounding continuous member to form a welded part as a cutting - guiding part on the waist - surrounding continuous member. Other features of the present invention will be clarified by the description in this specification and the attached drawings.

Effects of the Invention

[0008] According to the present invention, it is possible to provide a method for manufacturing a pants - type absorbent article that can efficiently form a cutting - guiding part for guiding a user to cut a member and bond materials.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Mode for Carrying Out the Invention

[0010] At least the following matters become clear from the description in this specification and the attached drawings. Aspect 1 is a method for manufacturing a pant-type absorbent article including a waist portion and a fastening portion, the method including: a conveying step of conveying the waist continuous member for forming the waist portion in a conveying direction; and a welding step of welding a base end portion of the fastening portion to the waist continuous member to form a welded portion as a cutting guide portion on the waist continuous member.

[0011] According to the method for manufacturing a pant-type absorbent article of Aspect 1, the cutting guide portion is a portion that guides a user so that the waist portion is cut during product use, and the bonding of the fastening portion and the formation of such a cutting guide portion can be efficiently performed in one step (welding step) of forming the welded portion.

[0012] Aspect 2 is the method for manufacturing a pant-type absorbent article according to Aspect 1, wherein a partial cutting portion where a part of the waist continuous member is cut is formed by forming the welded portion.

[0013] According to the method for manufacturing a pant-type absorbent article of Aspect 2, the partial cutting portion is a notch that makes the waist portion easily cut at the cutting guide portion. The partial cutting portion is not only efficiently formed together with the bonding of the fastening portion by one step (welding step) of forming the welded portion, but also includes cases where it is formed by the tension applied to the waist continuous member during conveyance after the welded portion is formed. Also, in terms of cross-sectional configuration, when forming the partial cutting portion separately, it needs to be performed before the bonding of the fastening portion, and in such a case, there is a risk that the waist portion breaks from the partial cutting portion before the bonding of the fastening portion. However, by welding the base end portion of the fastening portion to the waist continuous member, a welded portion as a cutting guide portion is simultaneously formed on the waist continuous member, so the above concerns can be eliminated.

[0014] Aspect 3 is the method for manufacturing a pant-type absorbent article according to Aspect 1 or 2, wherein when a direction intersecting the conveying direction is defined as the CD direction, the cutting guide portion is formed from one end to the other end of the waist continuous member in the CD direction by forming the welded portion.

[0015] According to the manufacturing method of the pant-type absorbent article of Aspect 3, by forming the cutting guide portion along the CD direction, the possibility of inhibiting the conveyance state is reduced. Further, the cutting guide portion is a portion that guides the body circumferential portion to be cut along the vertical direction (CD direction during conveyance) from its upper end to its lower end during product use, and by being formed from one end on one side in the CD direction to the other end, it makes it easier to promote the cutting of the body circumferential portion during use.

[0016] Aspect 4 is a method for manufacturing a pant-type absorbent article according to any one of Aspects 1 to 3, wherein when the direction intersecting the conveyance direction is defined as the CD direction, the cutting guide portion has a first inclined portion that inclines from the central portion in the CD direction toward one side and toward the base end portion side of the fastening portion, and a second inclined portion that inclines from the central portion toward the other side and toward the base end portion side of the fastening portion. When a portion of the fastening portion located on the opposite side of the conveyance direction from the base end portion is defined as the tip end portion, the intersection point of the first inclined portion and the second inclined portion is located on the tip end portion side in the conveyance direction with respect to the outer end in the CD direction of the first inclined portion and the outer end in the CD direction of the second inclined portion.

[0017] According to the manufacturing method of the pant-type absorbent article of Aspect 4, the fastening portion is a portion that grasps the tip end portion and pulls it in the left-right direction (conveyance direction during manufacturing) when cutting the body circumferential portion during product use. Since the inclination of the cutting guide portion is formed in the above shape, the pulling force is likely to first concentrate on the above intersection point of the cutting guide portion, and the force is propagated along the inclined portion from there, so it becomes easy to be cut along the cutting guide portion.

[0018] Aspect 5 is a method for manufacturing a pant-type absorbent article according to any one of Aspects 2 to 4, wherein when the direction intersecting the conveyance direction is defined as the CD direction, by forming the welding portion, a partial cutting portion having a predetermined length in the CD direction of the body circumferential continuous member is formed along the cutting guide portion.

[0019] According to the method for manufacturing a pants-type absorbent article of Aspect 5, the cutting guide portion of the pants-type absorbent article is a portion that guides the body circumferential portion to be cut along the vertical direction from its upper end to its lower end during use. By forming a partial cut portion having a predetermined length in the CD direction (the vertical direction of the product) of the body circumferential continuous member along the cutting guide portion, the partial cut portion can be formed without inhibiting the conveying state.

[0020] Aspect 6 is a method for manufacturing a pants-type absorbent article according to any one of Aspects 1 to 5, which has an interval changing step of changing the attachment interval of the fastening portion according to the product size before the welding step.

[0021] According to the method for manufacturing a pants-type absorbent article of Aspect 6, due to the interval changing step, the interval can be changed according to the product size manufactured by changing the setting of the interval changing step, so it is not necessary to replace the entire interval changing device.

[0022] Aspect 7 is a method for manufacturing a pants-type absorbent article according to Aspect 6, which has a temporary fixing step of temporarily fixing the fastening portion to the body circumferential continuous member after the interval changing step and before the welding step.

[0023] According to the method for manufacturing a pants-type absorbent article of Aspect 7, by temporarily fixing the fastening portion before performing the welding step, it is possible to avoid the displacement or detachment of the fastening portion during conveyance before performing the welding step, and also improve the stability of the subsequent welding step.

[0024] Aspect 8 is a method for manufacturing a pants-type absorbent article according to Aspect 7, in which, in the temporary fixing step, no temporary fixing portion is formed at the tip portion of the fastening portion, which is located on the side opposite to the base end portion in the conveyance direction.

[0025] According to the method for manufacturing a pants-type absorbent article of Aspect 8, the tip portion of the fastening portion is a portion used to be grasped by the finger and peeled off during product use. By not forming a temporary fixing portion at that position, it becomes easier for the user to grasp the fastening portion and peel it off from the body circumferential portion.

[0026] Aspect 9 is a method for manufacturing a pant-type absorbent article according to Aspect 7 or 8, wherein, with reference to the cutting guide portion, when the upstream side in the conveying direction of the fastening portion is defined as the upstream side portion and the downstream side in the conveying direction of the fastening portion is defined as the downstream side portion, the total area of the temporary fastening portions provided per unit area of the downstream side portion of the fastening portion is larger than the total area of the temporary fastening portions provided per unit area of the upstream side portion of the fastening portion.

[0027] According to the method for manufacturing a pant-type absorbent article of Aspect 9, among the temporarily fastened fastening portions, the downstream side portion is a portion where curling or displacement is likely to occur during conveyance. By forming a large number of temporary fastening portions on such a downstream side portion, the occurrence of curling or the like can be suppressed, and the welding process can be performed more stably.

[0028] Aspect 10 is a method for manufacturing a pant-type absorbent article according to any one of Aspects 1 to 9, wherein the body circumferential portion has a first sheet, a second sheet, and a body circumferential elastic member provided between the first sheet and the second sheet, the body circumferential continuous member has a first sheet material in which the first sheet is continuous in the conveying direction, a second sheet material in which the second sheet is continuous in the conveying direction, and a body circumferential elastic continuous member in which the body circumferential elastic member is continuous in the conveying direction, the body circumferential elastic continuous member is joined in an extended state between the first sheet material and the second sheet material, and in the welding process, the body circumferential elastic continuous member is cut by forming the welded portion.

[0029] According to the method for manufacturing a pant-type absorbent article of Aspect 10, by cutting the body circumferential elastic continuous member (body circumferential elastic member), the body circumferential elastic member becomes discontinuous in the region where the fastening portion exists, and the stretchability is not exhibited. By eliminating the expansion and contraction in the region where the fastening portion exists, wrinkles or the like are less likely to occur in the fastening portion, and the usability of the product can be improved.

[0030] Aspect 11 is a method for manufacturing a pants-type absorbent article according to any one of Aspects 1 to 10, in which, when the direction intersecting the conveyance direction is defined as the CD direction, in the welding step, the welding part is formed such that the outer end part of the welding part in the CD direction does not form a continuous line.

[0031] According to the method for manufacturing a pants-type absorbent article of Aspect 11, since the welded part does not form a continuous line, a so-called non-welded part is provided. In this non-welded part, a part of the body-circumference continuous member is connected without being welded. By providing a non-welded part where a part of the body-circumference continuous member is connected together with the cutting induction part while forming the welding part (cutting induction part), the body-circumference continuous member is not cut to the end, so that it is possible to prevent the flow of the production line from being interrupted.

[0032] Aspect 12 is a method for manufacturing a pants-type absorbent article according to Aspect 11, in which the fastening part has an engaging part that detachably engages with the non-skin side surface of the body-circumference part, and when the part where the welded part does not form a continuous line is defined as a discontinuous part, the discontinuous part is provided at a position that does not overlap with the engaging part in the CD direction.

[0033] According to the method for manufacturing a pants-type absorbent article of Aspect 12, when the cutting induction part is formed, the engaging part is in a state of detachably engaging with the body-circumference continuous member. Therefore, in the region where the engaging part exists, the body-circumference continuous member and the engaging part are engaged, so that the spread of tearing from the partial cutting part can be suppressed. By forming a discontinuous part at a position that does not overlap with the engaging part, it becomes easier to suppress the spread of cutting starting from the partial cutting part even in the region where the engaging part does not exist.

[0034] Aspect 13 is a method for manufacturing a pants-type absorbent article according to any one of Aspects 2 to 12, in which the fastening part has an engaging part that detachably engages with the non-skin side surface of the body-circumference part, and when the direction intersecting the conveyance direction is defined as the CD direction, in the welding step, at least a part of the partial cutting part is formed to overlap with the engaging part in the CD direction.

[0035] According to the manufacturing method of the pant-type absorbent article of Aspect 13, the partial cutting portion is located on the extension of the conveying direction (left-right direction of the product) of the engaging portion, and the opening of the partial cutting portion in the conveying direction can be suppressed.

[0036] Aspect 14 is the manufacturing method of the pant-type absorbent article according to any one of Aspects 2 to 12, wherein the fixing portion has an engaging portion that detachably engages with the non-skin side surface of the body circumferential portion, and when the direction intersecting the conveying direction is defined as the CD direction, in the welding step, the partial cutting portion is formed so as not to overlap with the engaging portion in the CD direction.

[0037] According to the manufacturing method of the pant-type absorbent article of Aspect 14, by providing the partial cutting portion at a location that does not overlap with the engaging portion, the influence on the body circumferential continuous member is reduced, and the risk of the cutting of the body circumferential continuous member spreading during conveyance can be reduced.

[0038] Aspect 15 is the manufacturing method of the pant-type absorbent article according to any one of Aspects 2 to 14, wherein when the direction intersecting the conveying direction is defined as the CD direction, the cutting guide portion has a first inclined portion that inclines from the central portion in the CD direction toward one side and the base end portion side of the fixing portion, and a second inclined portion that inclines from the central portion toward the other side and the base end portion side of the fixing portion, and the partial cutting portion is located across the intersection of the first inclined portion and the second inclined portion.

[0039] According to the manufacturing method of the pant-type absorbent article of Aspect 15, by providing the partial cutting portion across the intersection of the first inclined portion and the second inclined portion, it is possible to prevent the partial cutting portion from expanding during conveyance.

[0040] Aspect 16 is the manufacturing method of the pant-type absorbent article according to any one of Aspects 7 to 9, wherein by forming the welding portion, a partial cutting portion in which a part of the body circumferential continuous member is cut is formed, and when the direction intersecting the conveying direction is defined as the CD direction, at least a part of the partial cutting portion overlaps with the temporary fixing portion in the CD direction.

[0041] According to the manufacturing method of the pant-type absorbent article of aspect 16, the temporary fixing portion strengthens the fixing of the body circumferential continuous member of the fastening portion, and further suppresses the elongation of the body circumferential portion continuous member in the conveyance direction (the left-right direction of the product). Therefore, the opening of the partial cutting portion in the conveyance direction can be suppressed, and unnecessary cutting of the body circumferential continuous member starting from the partial cutting portion can be suppressed.

[0042] Aspect 17 is the manufacturing method of the pant-type absorbent article according to aspect 12, in which, in the welding step, when forming the welded portion, an auxiliary welded portion different from the welded portion is formed by welding the base end portion of the fastening portion to the body circumferential continuous member, the auxiliary welded portion is adjacent to the cutting induction portion from the base end portion side of the fastening portion in the conveyance direction, and at least a part of the non-continuous portion overlaps with the auxiliary welded portion in the CD direction.

[0043] According to the manufacturing method of the pant-type absorbent article of aspect 17, by forming the auxiliary welded portion, the tensile strength concentrated on the non-continuous portion can be relaxed at the auxiliary welded portion, thereby preventing breakage in the conveyance direction.

[0044] Aspect 18 is a manufacturing apparatus for a pant-type absorbent article including a body circumferential portion and a fastening portion, the manufacturing apparatus including a conveyance portion that conveys the body circumferential continuous member for forming the body circumferential portion in the conveyance direction, and a welding formation portion that welds the base end portion of the fastening portion to the body circumferential continuous member to form a welded portion as a cutting induction portion on the body circumferential continuous member.

[0045] According to the manufacturing apparatus of the pant-type absorbent article of aspect 18, the cutting induction portion is a portion that guides the user so that the body circumferential portion is cut during product use. In the manufacturing apparatus, the bonding of the fastening portion and the formation of such a cutting induction portion can be efficiently performed by one welding formation portion that forms the welded portion.

[0046] ===Embodiment=== The manufacturing method and manufacturing apparatus of the pants-type absorbent article 1 according to the present embodiment are used in a manufacturing line 100 of a pants-type disposable diaper 1 for infants as an example of the pants-type absorbent article 1. However, the pants-type absorbent article according to the present invention is not limited to the pants-type disposable diaper for infants, and can also be used, for example, as an adult disposable diaper or a sanitary shorts.

[0047] <Basic configuration of the disposable diaper 1> FIG. 1 is a perspective view of the disposable diaper 1 (hereinafter referred to as "diaper") in a worn state, and is a perspective view seen from one side in the left-right direction. FIG. 2 is a plan view of the diaper 1 in a deployed and extended state as seen from the non-skin side. The center line C-C in FIG. 2 is the center line in the left-right direction in the extended state. FIGS. 3 and 4 are enlarged views of a portion X in FIG. 2.

[0048] The "deployed state" means a state in which both side portions of the diaper 1 in the pants-type state, that is, the side joining portions 2a and 2b of both side end portions of the ventral body circumferential portion 20 and both side end portions of the dorsal body circumferential portion 30, which will be described later, are separated and opened, and the entire diaper 1 is flattened. The "extended state" means a state in which the elastic members provided in the diaper 1 are extended until the wrinkles of the diaper 1 are no longer visible. Specifically, it indicates a state in which each member constituting the diaper 1 (for example, the ventral body circumferential portion 20 described later) is extended until the dimension of the member becomes the same as or close to the dimension of the member alone.

[0049] In the pants-type state shown in FIG. 1, the diaper 1 has an up-down direction, a left-right direction, and a front-back direction that intersect (are orthogonal) to each other, and a body circumferential opening BH and a pair of leg circumferential openings LH, LH are formed. In the up-down direction, the side of the body circumferential opening BH is the upper side, and the crotch side is the lower side. In the front-back direction, the ventral side of the wearer is the front side, and the dorsal side of the wearer is the back side. Further, the direction in which the materials constituting the diaper 1 are laminated is referred to as the thickness direction, the side that contacts the wearer in the thickness direction is referred to as the skin side, and the side opposite to the skin side is referred to as the non-skin side. Note that the thickness direction is also the direction along the front-back direction in the diaper 1 in the pants-type state.

[0050] The diaper 1 is a so-called three-piece type, and has an annular body circumferential portion including a ventral body circumferential portion 20 and a dorsal body circumferential portion 30, and an absorbent body 10. The ventral body circumferential portion 20 covers the ventral side of the wearer, and the dorsal body circumferential portion 30 covers the dorsal side of the wearer. The diaper 1 also has a fastening portion 5.

[0051] In the unfolded diaper 1 shown in FIG. 2, the ventral body circumferential portion 20 and the dorsal body circumferential portion 30 are arranged such that their longitudinal directions are along the left-right direction of the diaper 1. And, one end of the absorbent body 10 in the longitudinal direction is arranged at the central portion of the ventral body circumferential portion 20 in the left-right direction, and the other end of the absorbent body 10 in the longitudinal direction is arranged at the central portion of the dorsal body circumferential portion 30 in the left-right direction, thereby forming the crotch portion 80. The absorbent body 10 is arranged closer to the skin side than the ventral body circumferential portion 20 and the dorsal body circumferential portion 30.

[0052] The diaper 1 shown in FIG. 2 in the unfolded state is folded in half at the approximate center CL in the longitudinal direction with the longitudinal direction of the absorbent body 10 along the up-down direction of the diaper 1, and both side ends of the ventral body circumferential portion 20 and both side ends of the dorsal body circumferential portion 30 in the left-right direction of the diaper 1 are joined by heat welding, ultrasonic welding, etc., to form a pair of side joining portions 2a, 2b, thereby obtaining the diaper 1 in the panty type state shown in FIG. 1. The side joining portion 2a is a joining portion provided on one side in the left-right direction, and the side joining portion 2b is a joining portion provided on the other side in the left-right direction.

[0053] The absorbent body 10 has an absorber 11, a liquid-permeable topsheet 12 arranged closer to the skin side than the absorber 11, a second sheet 13 arranged between the topsheet 12 and the absorber 11, a side sheet 14 arranged closer to the skin side than the absorber 11 and the second sheet 13, a liquid-impermeable backsheet 15 arranged on the non-skin side of the absorber 11, and an outer sheet 16 arranged on the non-skin side of the backsheet 15.

[0054] The absorber 11 has a substantially rectangular shape in plan view, and includes an absorbent core 11A that absorbs and holds excreted fluids such as urine, and a liquid-permeable core wrap sheet (not shown) that covers the absorbent core. Examples of the absorbent core 11A include those formed by shaping liquid-absorbent fibers such as pulp containing a superabsorbent polymer (SAP) into a predetermined shape, for example, a substantially hourglass shape in plan view (a molded product of liquid-absorbent fibers), and a so-called SAP sheet formed by shaping a superabsorbent polymer (SAP) into a sheet shape. Examples of the core wrap sheet include liquid-permeable sheets such as tissue paper and non-woven fabric, but a configuration without a core wrap sheet may also be used.

[0055] As shown in FIG. 2, the leg-around elastic members 17 provided on both sides in the left-right direction of the absorbent main body 10 constitute leg gathers. The leg gathers of the diaper 1 in the pant-type state are provided along each leg-around opening LH, and the diaper 1 fits around the wearer's legs due to the expansion and contraction of the leg-around elastic members 17. The leg-around elastic members 17 of the diaper 1 are made of a plurality of thread rubbers. For example, between the outer cover sheets 16 that are folded back inward in the left-right direction to form two layers, they are fixed in a state of being extended in the longitudinal direction between the back sheet 15 and the outer cover sheet 16.

[0056] On both sides in the left-right direction of the absorbent main body 10, inside the leg-around elastic members 17, there are leak-proof wall elastic members 18. A plurality of leak-proof wall elastic members 18 are fixed in a state of being extended in the longitudinal direction between the side sheets 14 that are folded back outward in the left-right direction to form two layers, forming a pair of leak-proof wall portions along the longitudinal direction. When the diaper 1 is worn, due to the elasticity exhibited by the leak-proof wall elastic members 18, the leak-proof wall portions stand up on the wearer's skin side and fit around the wearer's crotch.

[0057] Examples of the leg-around elastic members 17 and the leak-proof wall elastic members 18 include thread rubbers and elastic sheets.

[0058] The ventral body circumferential part 20 has a skin-side sheet 21, a non-skin-side sheet 22 disposed on the non-skin side of the skin-side sheet 21, and a plurality of body circumferential elastic members 23 that expand and contract in the left-right direction. The skin-side sheet 21 and the non-skin-side sheet 22 are sheet members of substantially the same size and substantially the same shape, and in the present embodiment, they have a substantially rectangular shape. As the skin-side sheet 21 and the non-skin-side sheet 22, non-elastic sheets such as SMS non-woven fabric (spunbonded-meltblown-spunbonded non-woven fabric), spunbonded non-woven fabric, air-through non-woven fabric, point-bonded non-woven fabric, stretch non-woven fabric, plastic sheet, perforated plastic sheet, and laminated sheets thereof can be used.

[0059] The plurality of body circumferential elastic members 23 of the ventral body circumferential part 20 are arranged side by side in the vertical direction between the skin-side sheet 21 and the non-skin-side sheet 22 and are fixed in an extended state in the left-right direction. Therefore, the ventral body circumferential part 20 expands and contracts in the left-right direction and fits around the wearer's body circumference. Examples of the body circumferential elastic member 23 include elastic members such as rubber and spandex. The ventral body circumferential part 20 has an engaged part 25 on the non-skin side surface of the non-skin-side sheet 22 that enables engagement with an engaging part 51 (described later) of the fastening part 5. The engaged part 25 is a so-called target area, and for example, a non-woven fabric sheet can be exemplified. Further, when a male member of a hook-and-loop fastener is used for the engaging part 51, it is desirable to select an engaged part corresponding to the engaging part 51, such as using a female member of a hook-and-loop fastener for the engaged part 25. Furthermore, as the engaged part 25, without providing a separate member on the non-skin side surface of the non-skin-side sheet 22, a non-skin-side sheet 22 made of a member (e.g., non-woven fabric) that can engage with the engaging part 51 can be used to directly engage with the non-skin side surface of the non-skin-side sheet 22. However, conversely, the engaged part 25 of the ventral body circumferential part 20 may be a male member of a hook-and-loop fastener, and the engaging part 51 of the fastening part 5 (the surface facing the ventral body circumferential part 20) may be a non-woven fabric sheet, a female member of a hook-and-loop fastener, or the like.

[0060] The back torso portion 30 includes a skin-side sheet 31, a non-skin-side sheet 32 disposed on the non-skin side relative to the skin-side sheet 31, and a plurality of torso expansion and contraction members 33 that expand and contract in the left-right direction. The skin-side sheet 31 and the non-skin-side sheet 32 are joined to each other in a laminated state by joining means such as an adhesive like hot melt, welding by heat or ultrasonic waves, etc. The skin-side sheet 31 and the non-skin-side sheet 32 are sheet members of substantially the same size and substantially the same shape, and in the present embodiment, they have a substantially rectangular shape. As the skin-side sheet 31 and the non-skin-side sheet 32, for example, non-stretch sheets such as polypropylene SMS non-woven fabric (spunbond·meltblown·spunbond non-woven fabric), spunbond non-woven fabric, air-through non-woven fabric, point-bond non-woven fabric, stretch non-woven fabric, plastic sheet, perforated plastic sheet, and laminated sheets thereof can be used.

[0061] The plurality of torso expansion and contraction members 33 of the back torso portion 30 are arranged side by side in the vertical direction between the skin-side sheet 31 and the non-skin-side sheet 32, and are fixed in an extended state in the left-right direction. Therefore, the ventral torso portion 20 and the back torso portion 30 each expand and contract in the left-right direction and fit around the wearer's torso. Examples of the torso expansion and contraction member 33 include elastic members such as rubber and spandex.

[0062] The fastening portion 5 is a so-called tab (knob) member, and is a member used to engage the engaging portion 51 to reconnect the ventral torso portion 20 when the ventral torso portion 20 is cut. In the fastening portion 5 of the present embodiment, the base end portion of the fastening portion 5 (one side in the left-right direction in FIG. 2 etc.) is fixed to one side of the ventral torso portion 20 more than the center in the left-right direction, and the tip end portion of the fastening portion 5 (the other side in the left-right direction in FIG. 2 etc.) has an engaging portion 51 that detachably engages with the non-skin side surface of the ventral torso portion 20.

[0063] Since the fixing part 5 is a member for the wearer or a person who tries to wear the diaper 1 on the wearer (hereinafter also referred to as "wearer etc.") to grasp and perform operations, it preferably has a strength such that the fixing part 5 itself does not break. As the fixing part 5, for example, various films such as plastic films and nylon films, non-woven fabrics, films obtained by laminating non-woven fabrics, etc. can be used.

[0064] The engaging part 51 is provided on the skin side surface of the fixing part 5 and is a member that can be detachably engaged with the non-skin side surface (specifically, the engaged part 25) of the ventral body circumferential part 20. Examples of the engaging part 51 include the male member of a hook-and-loop fastener and an adhesive material such as an adhesive sheet. The engaging part 51 of the present embodiment is substantially rectangular, but may have an arbitrary shape such as a round shape.

[0065] As shown in FIG. 3 etc., the base end part of the fixing part 5 is fixed to the ventral body circumferential part 20 by a welding part F1, an auxiliary welding part F2, and an auxiliary welding part F3. The welding part F1 and the auxiliary welding parts F2, F3 of the present embodiment are parts where the fixing part 5 and the ventral body circumferential part 20 are joined in the thickness direction by thermal welding, ultrasonic welding, etc. The fixing part 5 is mainly fixed to the ventral body circumferential part 20 by the welding part F1, and the auxiliary welding parts F2, F3 assist the fixing by the welding part F1.

[0066] ===Regarding the cutting of the ventral body circumferential part 20=== The cutting of the ventral body circumferential part 20 will be described with reference to FIGS. 5 and 6. FIG. 5 is a diagram for explaining the separation and joining of the ventral body circumferential part 20. FIG. 6 is a diagram for explaining the operation of cutting the ventral body circumferential part 20. FIG. 5 is a diagram for explaining the cross-sectional configuration along line A - A in FIG. 3. Note that FIGS. 5 and 6 are schematic diagrams, and dimensions etc. are not necessarily accurate.

[0067] The diaper 1 is distributed in a state where the ventral body circumferential portion 20 and the dorsal body circumferential portion 30 are joined at the side joints 2a and 2b. Therefore, a user (for example, a caregiver) who takes out the diaper 1 from the package cuts and opens a part of the annular body circumferential portions 20 and 30 (here, a part on one side in the left - right direction of the ventral body circumferential portion 20) in the vertical direction. Then, the user passes one leg of the wearer (for example, a child) (the right leg of the wearer in the diaper 1) through the leg - around opening LH on the other side in the left - right direction, and then pulls up the diaper 1 to the crotch portion of the wearer. After that, the user engages the engaging portion 51 of the fastening portion 5 with the ventral body circumferential portion 20 so as to fit around the body of the wearer, and joins the ventral body circumferential portion 20 together to be in a worn state.

[0068] In this way, in the diaper 1, one side in the left - right direction is in the form of a tape - type diaper (a state where the leg - around opening LH is not formed), and the other side in the left - right direction can be worn in the form of a so - called pants - type diaper (a state where the leg - around opening LH is formed).

[0069] For this purpose, the diaper 1 has a "cutting - guiding portion 40" that guides the vertical cutting of the body circumferential portions 20 and 30. Specifically, the cutting - guiding portion 40 is a portion that guides the user so that the body circumferential portions 20 and 30 are cut in the vertical direction from their upper ends (the ends facing the body - around opening BH) to their lower ends (the ends facing the leg - around opening LH). The cutting - guiding portion 40 is also a portion where the body circumferential portions 20 and 30 are easily cut. That is, the body circumferential portions 20 and 30 can be cut at the cutting - guiding portion 40 with a smaller force than when the user cuts the body circumferential portions 20 and 30 at a non - cutting - guiding portion.

[0070] In the diaper 1 of the present embodiment, the welded portion F1 that fixes the ventral body circumferential portion 20 and the fastening portion 5 functions as the cutting - guiding portion 40. The welded portion F1 joins the fastening portion 5 and the ventral body circumferential portion 20 in the thickness direction by thermal welding, ultrasonic welding, or the like.

[0071] Note that auxiliary welding parts F2 and F3 are provided on the base end side of the fixing part 5 rather than the welding part F1 in the left - right direction. Also in the auxiliary welding parts F2 and F3, the fixing part 5 and the ventral body circumferential part 20 are joined in the thickness direction by thermal welding, ultrasonic welding, or the like.

[0072] Here, FIG. 5A is a cross - sectional view of the diaper 1 in the pant - type state shown in FIG. 1 and the like. That is, the ventral body circumferential part 20 is not cut, and the ventral body circumferential part 20 and the dorsal body circumferential part 30 form a continuous body circumferential opening BH via the side joining parts 2a and 2b. The state of grasping the tip of the fixing part 5 and pulling it upward toward the non - skin side from the state shown in FIG. 5A is shown in FIGS. 5B and 6A.

[0073] Then, as shown in FIG. 6A, by grasping the ventral body circumferential part 20 with one hand and grasping the fixing part 5 with the other hand and pulling them outward in the left - right direction respectively, as shown in FIGS. 5C and 6B, the ventral body circumferential part 20 is cut along the cutting induction part 40. That is, the ventral body circumferential part 20 is separated into a part on one side with the fixing part 5 and a part on the other side without the fixing part 5. In the welding part F1, during welding, a part of the fibers of the skin - side sheet 21 and the non - skin - side sheet 22 constituting the ventral body circumferential part 20 melts and integrates. Therefore, the rigidity of the ventral body circumferential part 20 in the welding part F1 becomes higher than the rigidity of the part of the ventral body circumferential part 20 adjacent to the welding part F1. Thus, when the user pulls in the left - right direction while holding the ventral body circumferential part 20 and the fixing part 5, at the boundary part with different rigidities, the ventral body circumferential part 20 on the side with a lower basis weight than the fixing part 5 is cut as if it were torn. That is, the ventral body circumferential part 20 is cut along the other end CE in the left - right direction of the welding part F1 (at the boundary between the welding part F1 and the non - welded part).

[0074] Thereafter, as shown in FIG. 5D, by engaging the engaging part 51 of the fixing part 5 with the engaged part 25 of the ventral body circumferential part 20, the ventral body circumferential part 20 is again joined. Also, when engaging the engaging part 51 with the engaged part 25, the size of the body circumferential opening of the diaper 1 can be adjusted by adjusting the engaging position.

[0075] FIG. 7 is a diagram for explaining the partial cut portion 41. FIG. 7A is a diagram for explaining the cross-sectional configuration along line B-B in FIG. 3. FIG. 7B is a diagram showing the state where the fastening portion 5 is opened.

[0076] The diaper 1 has a "partial cut portion 41" in which a part of the circumferential portions 20 and 30 (here, the ventral circumferential portion 20) in the vertical direction is cut at the cut guide portion 40. That is, a part of the circumferential portions 20 and 30 that the user cuts along the cut guide portion 40 is cut in advance. In the diaper 1 of the present embodiment, a part of the ventral circumferential portion 20 adjacent to the welded portion F1 from the other side in the left-right direction is cut in advance as the partial cut portion 41. As shown in FIG. 7A, in the partial cut portion 41, only the ventral circumferential portion 20 is cut, and the fastening portion 5 is not cut. In FIGS. 3 and 4, the partial cut portion 41 is virtually shown from the non-skin side of the fastening portion 5.

[0077] For example, as shown in FIG. 3, when the partial cut portion 41 is provided at the central portion in the vertical direction of the cut guide portion 40, when the user rolls up the fastening portion 5, as shown in FIGS. 6A and 7B, the partial cut portion 41 is visually recognized as a through hole.

[0078] A user who visually recognizes the partial cut portion 41 can easily recognize that the circumferential portions 20 and 30 are cut and worn, and can also easily recognize the position where the circumferential portions 20 and 30 should be cut. Therefore, it is possible to prevent the circumferential portions 20 and 30 from being worn in an annular state without being cut. In addition, it is possible to prevent the circumferential portions 20 and 30 from being cut at a position away from the fastening portion 5, for example, instead of the cut guide portion 40, and the adjustment width of the circumferential portions 20 and 30 from becoming short. That is, the partial cut portion 41 makes it easier for the circumferential portions 20 and 30 to be cut at the cut guide portion 40, and makes it easier for the diaper 1 to be properly worn.

[0079] Note that, in the diaper 1 before use, on the other side in the left - right direction of the cutting guide portion 40, the fixing portion 5 is fixed to the ventral body circumferential portion 20 by the engaging portion 51, and on one side in the left - right direction of the cutting guide portion 40 or on the cutting guide portion 40, the fixing portion 5 is fixed to the ventral body circumferential portion 20 by the welding portion F1. When the user handles the diaper 1, even when the body circumferential portions 20 and 30 are extended in the left - right direction, the extension of the ventral body circumferential portion 20 in the left - right direction is suppressed by such a fixing portion 5.

[0080] Also, as shown in FIG. 4, the diaper 1 has a joining portion 60 (a temporary fixing portion described later) that joins the fixing portion 5 and the body circumferential portions 20 and 30 on the proximal end side (one side) of the fixing portion 5 rather than the cutting guide portion 40 in the left - right direction. The fixing of the fixing portion 5 to the ventral body circumferential portion 20 is strengthened by the joining portion 60, and the extension of the ventral body circumferential portion 20 in the left - right direction is suppressed by the fixing portion 5.

[0081] <Regarding the manufacturing method of the disposable diaper 1> FIG. 8 is a schematic side view of a part of the manufacturing line 100 of the pants - type disposable diaper 1 according to the present embodiment. FIG. 9 is a schematic diagram showing the manufacturing flow of the pants - type disposable diaper 1 according to the present embodiment. The manufacturing line 100 of the diaper 1 has a conveyance direction and a CD direction intersecting the conveyance direction. Regarding FIGS. 8 and 9, for the sake of easy understanding of the present invention, it is assumed that the absorbent body 10 is supplied in a completed form, and the manufacturing apparatus of the absorbent body 10 itself is shown as an omitted figure (hereinafter, the description of the manufacturing method of the absorbent body 10 is also omitted). Also, in FIG. 8, regarding the body circumferential portions (ventral body circumferential portion 20 and dorsal body circumferential portion 30), the body circumferential portions (ventral body circumferential portion 20 and dorsal body circumferential portion 30) in which the skin - side sheet 21 (31), the non - skin - side sheet 22 (32), and a plurality of body circumferential elastic members 23 (33) that expand and contract in the left - right direction are joined are supplied in the form of a body circumferential continuous member 20L (30L) continuous in the left - right direction (conveyance direction).

[0082] The manufacturing method of the disposable diaper 1 includes a conveying step S1 of conveying the circumferential continuous members 20L and 30L in the conveying direction, a step S2 of attaching the absorbent body 10 to the circumferential continuous members 20L and 30L, a fixing portion forming step S3, a fixing portion interval changing step S4, a fixing portion temporary fixing step S5, a welding step S6 of forming a welded portion on the circumferential continuous member 20L, a folding step S7, a side joint portion forming step S8, and a cutting step S9.

[0083] In the conveying step S1, as shown in FIG. 9, the circumferential continuous members 20L and 30L are conveyed in the conveying direction. The circumferential continuous member 20L is a state in which the skin-side sheet 21 (first sheet) related to the ventral circumferential portion 20 is continuously connected in the conveying direction as a skin-side continuous sheet 21a (first sheet material), and the non-skin-side sheet 22 (second sheet) is continuously connected in the conveying direction as a non-skin-side continuous sheet 22a (second sheet material), and they are overlapped in the thickness direction. And between these two continuous sheets 21a and 22a, a circumferential elastic continuous member 23a in which the circumferential elastic members 23 are continuously arranged in the CD direction and joined in an extended state is a continuous member. Similarly, the circumferential continuous member 30L is a state in which the skin-side sheet 31 related to the circumferential portion 30 is continuously connected in the conveying direction as a skin-side continuous sheet 31a, and the non-skin-side sheet 32 is continuously connected in the conveying direction as a non-skin-side continuous sheet 32a, and they are overlapped in the thickness direction. And between these two continuous sheets 31a and 32a, a circumferential elastic continuous member 33a in which the circumferential elastic members 33 are continuously arranged in the CD direction and joined in an extended state is a continuous member.

[0084] Note that the conveyance of the circumferential continuous members 20L and 30L in the conveyance step S1 is performed by an appropriate conveyance device (conveyance unit, not shown) such as a belt conveyor or conveyance rollers. Therefore, unless otherwise specified, it is assumed that the circumferential continuous members 20L and 30L are conveyed in the conveying direction by these conveyance devices. As an example of the belt conveyor, a normal belt conveyor having an endless belt that rotates driven as a conveying surface, a suction belt conveyor having a suction function on the outer peripheral surface of the endless belt, etc. can be mentioned.

[0085] In step S2 of attaching the absorbent body 10 to the circumferential continuous members 20L and 30L, a single-sheet absorbent body 10 generated in another process (not shown) is stretched and fixed between the circumferential continuous member 20L related to the ventral circumferential portion 20 and the circumferential continuous member 30L related to the dorsal circumferential portion 30 (Fig. 9). Thereby, a substantially ladder-shaped diaper continuum 1hs in which diapers 1h, 1h... developed in a substantially H shape are continuous is formed.

[0086] The fixing portion forming step S3 is performed in another process before attaching the single-sheet fixing portion 5 to the circumferential continuous member 20L as shown in Fig. 8. In this step S3, a single-sheet fixing portion 5 is formed by cutting out a fixing portion base material sheet 5K for forming the fixing portion 5 into the shape of the fixing portion 5. Note that a male member of a hook-and-loop fastener serving as the engaging portion 51, an adhesive material such as an adhesive sheet, etc. are attached to the fixing portion base material sheet 5K in advance at the product pitch. The cutting of the fixing portion base material sheet 5K is performed using, for example, a die cutter device 105 as an example. Each single-sheet formed fixing portion 5 is delivered one by one to a repitching device 106 at the processing position PK1 shown in Fig. 8.

[0087] In the fixing portion interval changing step S4 (interval changing step), when transferring the single-sheet fixing portion 5 to the next heat sealing device 110 using the repitching device 106, the transfer timing is changed to the attachment interval according to the product size. That is, after forming each fixing portion 5 in the fixing portion forming step S3, in step S4, the formed fixing portions 5 are separated from each other at a desired interval. As the repitching device 106, for example, a known repitch drum can be adopted. Specifically, as shown in Fig. 8, holding pads 106P for sucking and holding the fixing portion 5 are provided at a plurality of positions in the rotational direction on the outer peripheral portion of the repitching device 106. After the holding pad 106P receives the fixing portion 5 at the processing position PK1, it accelerates while rotating and moves to change to the desired attachment interval. Then, at the processing position PK2, the fixing portion 5 is delivered to the heat sealing device 110. By changing the setting of the interval changing step in this way, the interval at which the fixing portion 5 is delivered can be changed according to the product size to be manufactured, so that it is not necessary to replace the entire interval changing device.

[0088] The fastening portion 5 delivered to the heat-sealing device 110 merges with the circumferential continuous member 20L (the diaper continuum 1hs) at the processing position PK3, and the temporary fastening step S5 of the fastening portion is performed (FIGS. 8 and 9). Details of the temporary fastening step S5 of the fastening portion will be described later. In the circumferential continuous member 20L, the engaged portion 25 is adhered to the non-skin side surface of the non-skin side continuous sheet 22a at the product pitch between the above-described conveying step S1 and before the temporary fastening step S5 of the fastening portion is performed, but the method thereof will be omitted.

[0089] In the welding step S6, the ultrasonic welding device 115 (welding forming portion) welds the fastening portion 5 to the circumferential continuous member 20L to form a welded portion F1 on the circumferential continuous member 20L. Details of the welding step S6 will be described later.

[0090] After the welding step S6, when the substantially ladder-shaped diaper continuum 1hs passes through the processing position PK5 (FIG. 9), a folding step S7 of folding the absorbent body 10 in half at a predetermined position CL1 in the crossing direction (CD direction) of the absorbent body 10 is performed. As a result, the circumferential continuous member 20L related to the ventral circumferential portion 20 and the circumferential continuous member 30L related to the dorsal circumferential portion 30 are stacked in the thickness direction. Such folding in half can be performed, for example, using a folding guide device (not shown). The folding guide device has, for example, a guide plate or a guide roller disposed at a predetermined position in the conveying direction. Then, these guide plates and guide rollers guide the substantially ladder-shaped diaper continuum 1hs so that the continuum 1hs becomes a folded-in-half shape.

[0091] Next, in the side joint formation step S8, when the continuous diaper 1hsb in the two-folded state passes through the processing position PK6 (FIG. 9), the body continuous member 20L related to the ventral body circumferential portion 20 and the body continuous member 30L related to the dorsal body circumferential portion 30, which are overlapped in the thickness direction, are welded at respective positions on both sides of the cutting target position PC in the conveyance direction to form a pair of side joint regions 2a, 2b. Thereby, the continuous diaper 1hsb is fixed in the two-folded state. As a result, a continuous diaper 1s in the form of pants, in which a plurality of disposable pants-type diapers 1, 1... are connected in the conveyance direction, is produced.

[0092] Next, when the continuous diaper 1s in the form of pants passes through the processing position PK7, a cutting step S9 is performed to cut the continuous diaper 1s at the cutting target position PC located between the pair of side joint regions 2a, 2b, whereby the diaper 1 is manufactured.

[0093] <Regarding the temporary fixing step S5 of the fastening portion> Hereinafter, the details of the temporary fixing step S5 (temporary fixing step) will be described. FIG. 10 is an enlarged view for explaining the temporary fixing portion 60 formed by the temporary fixing step S5. Further, FIG. 10 is a view of the materials being conveyed (such as the body continuous member 20L and the absorbent body 10, etc.) seen from the skin side, showing the fastening portion 5 and the engaging portion 51 in a perspective state. Note that FIGS. 11 to 15 described later are also shown in the same manner.

[0094] After the interval change step S4, in the temporary fixing step S5 of the fastening part, at the processing position PK3 (FIGS. 8 and 9), a temporary fixing part 60 is formed by thermally welding the fastening part 5 to the circumferential continuous member 20L using the heat sealing device 110. The heat sealing device 110 has, for example, a pair of rolls that are heated while rotating along the conveyance direction. One roll is a heat embossing roll 110a having a convex part corresponding to the shape of the temporary fixing part 60 on its outer peripheral surface, and the other roll is an anvil roll 110b that receives the convex part with a smooth outer peripheral surface. In the present embodiment, the temporary fixing part 60 by thermal welding using a heat sealing device is exemplified, but the joining method of the temporary fixing part 60 is not particularly limited, and for example, joining by ultrasonic welding, joining by pressing without heating, joining by an adhesive, or the like may be used.

[0095] In the temporary fixing step S5 of the fastening part, the fastening part 5 is transferred onto the outer peripheral surface of the anvil roll 110b of the pair of rolls of the heat sealing device 110 from the re-pitch device 106 at the processing position PK2, and after moving along the rotation direction of the roll 110b, at the processing position PK3, it merges with the circumferential continuous member 20L (the diaper continuous body 1hs) formed in another step (step S2). At the time of merging, the fastening part 5 is disposed on the non-skin surface side of the circumferential continuous member 20L, and at that time, the engaging part 51 of the fastening part 5 is in a state of being separably engaged with the engaged part 25 provided on the circumferential continuous member 20L. Then, the circumferential continuous member 20L and the fastening part 5 are thermally welded so that the convex part of the heat embossing roll 110a hits the skin side surface of the circumferential continuous member 20L that merges to cover the fastening part 5 from above, and a plurality of temporary fixing parts 60 (joining parts 60) shown in FIG. 10 are formed.

[0096] By temporarily fixing the fastening portion 5 with the temporary fixing portion 60 before the welding step S6 performed downstream of the temporary fixing step S5, it is possible to avoid displacement or detachment of the fastening portion 5 during conveyance until the welding step S6 is performed, and also improve the stability of the subsequent welding step S6. Further, by providing the temporary fixing portion 60, it is possible to prevent the fastening portion 5 from being wound due to causes other than the engagement by the welded portion F1 and the engaging portion 51 formed in the welding step S6. Therefore, in the manufacturing line 100 of the diaper 1, it is possible to suppress the detachment and breakage of the fastening portion 5. Note that the fixing of the temporary fixing portion 60 is preferably weaker than the fixing of the welded portion F1 described later, and can be peeled off by the user winding the fastening portion 5.

[0097] Also, as shown in FIG. 10, when the base end portion of the fastening portion 5 is the base end portion 5t and the portion located on the side opposite to the base end portion 5t in the conveyance direction is the tip end portion 5s, in the temporary fixing step S5 of the fastening portion, although the temporary fixing portion 60 is formed on the base end portion 5t side, it is desirable not to form the temporary fixing portion 60 on the tip end portion 5s side. The "tip end portion 5s" in the present embodiment is a portion on the upstream side (the other side in the left-right direction, the side opposite to the base end portion 5t) from the center in the conveyance direction (the left-right direction of the product) of the fastening portion 5, and is preferably in the range of 1 / 4 from the above upstream side. The tip end portion 5s of the fastening portion 5 is a portion used by the user to grasp and peel off with a finger when using the product (diaper 1). By not forming the temporary fixing portion 60 at that position, it becomes easier for the user to grasp the fastening portion 5 and peel it off from the ventral body circumferential portion 20.

[0098] <Regarding the welding step S6> Hereinafter, the details of the welding process S6 will be described. FIG. 11 is an enlarged view for explaining the welded portion F1 formed in the welding process S6. As shown in FIGS. 8 and 9, the circumferential continuous member 20L (the continuous body 1hs of the diaper) with the fastening portion 5 temporarily fixed is further conveyed in the conveying direction. In the subsequent welding process S6, at the processing position PK4, using the ultrasonic welding device 115 (welding forming portion), a welded portion F1 is formed by welding the base end portion 5t of the fastening portion 5 to the circumferential continuous member 20L. Further, as shown in FIG. 11, the welded portion F1 that fixes the circumferential continuous member 20L and the fastening portion 5 functions as a cutting guide portion 40 that guides the user so that the ventral circumferential portion 20 is cut during product use. That is, by the welding process S6, the welded portion F1 as the cutting guide portion 40 is formed on the circumferential continuous member 20L. Note that the cutting guide portion 40 is preferably a portion where the circumferential continuous member 20L is thinned and weakened in the thickness direction by the ultrasonic welding device 115.

[0099] Also, in the welding process S6, simultaneously with the formation of the welded portion F1, auxiliary welded portions F2 and F3 are formed adjacent to the downstream side in the conveying direction of the welded portion F1. Note that the shape of the welded portion F1 is not limited to the shape shown in FIG. 11, and the number and shape of the auxiliary welded portions F2 and F3 are also not limited to the number and shape of the present embodiment.

[0100] Conventionally, there has been an absorbent article in the form of pants in the initial state of the product, having a fastening portion as in the present embodiment on one side or both sides in the left-right direction, and capable of forming a leg opening by cutting a part of the circumferential portion and engaging the fastening portion with the circumferential portion. When manufacturing such an article, there has been a process of welding the fastening portion to the material that becomes the circumferential portion. By such a welding process, the fastening portion is fixed to the circumferential portion. However, during use, by pulling the fastening portion, a part of the circumferential portion is cut and opened in the vertical direction, so a device that is easy to cut (easy to break) is required. For example, when making it easy to break by providing a perforation or the like, such a perforation or the like must be formed in a process separate from the above-described welding process, so an efficient method is necessary.

[0101] In this regard, as described above, the welding step S6 of the present embodiment can efficiently perform the bonding of the fastening portion 5 and the formation of the cutting guide portion 40 that facilitates the cutting of the ventral body circumferential portion 20 by welding the body circumferential continuous member 20L and the fastening portion 5 in a single step (welding step S6) for forming the welded portion F1. Since the cutting guide portion 40 is the welded portion F1, its rigidity is higher than that of the non-cutting guide portion, and it is a portion where the ventral body circumferential portion 20 is easily cut during use. That is, the diaper 1 to be manufactured is configured such that the ventral body circumferential portion 20 is cut at the boundary between the welded portion F1 and the non-welded portion by the cutting guide portion 40.

[0102] Also, as shown in FIG. 11, by forming the welded portion F1, the cutting guide portion 40 is formed from one end 20La on one side in the CD direction of the body circumferential continuous member 20L to the other end 20Lb. If the cutting guide portion 40 is formed along the conveyance direction, since an appropriate tension is applied to the material conveyed on the manufacturing line 100 in the conveyance direction, cutting may occur starting from the formed cutting guide portion 40, which may inhibit the conveyance state of the body circumferential continuous member 20L (the continuous diaper body 1hs). However, by forming the cutting guide portion 40 along the CD direction, the risk of inhibiting the conveyance state can be reduced. Further, since the cutting guide portion 40 is a portion that guides the ventral body circumferential portion 20 to be cut along the vertical direction (CD direction during conveyance) from its upper end to its lower end during product use, by forming the cutting guide portion 40 from one end 20La on one side in the CD direction of the body circumferential continuous member 20L to the other end 20Lb in the welding step S6, it becomes easier to promote the cutting of the ventral body circumferential portion 20 during use, improving the usability of the product.

[0103] Also, as shown in FIG. 11, in the present embodiment, by forming the welded portion F1, a partially cut portion 41 is formed where a part of the circumferential continuous member 20L is cut. Specifically, by forming the welded portion F1, a cutting guide portion 40 is formed. At the same time, along the cutting guide portion 40 (at the boundary between the welded portion F1 and the non-welded portion), a partially cut portion 41 where a part of the circumferential continuous member 20L is cut is formed. As a method, the partially cut portion 41 may be formed by changing the welding strength (ultrasonic energy) according to the position of the cutting guide portion 40 in the CD direction. The partially cut portion 41 is a notch that facilitates cutting the ventral circumferential portion 20 at the cutting guide portion 40 during product use. Also, in terms of the cross-sectional configuration of the ventral circumferential portion 20, when forming the partially cut portion 41 separately, it is necessary to perform it before bonding the fastening portion 5. In such a case, the circumferential continuous member 20L may break from the partially cut portion 41 before bonding the fastening portion 5. However, in the present embodiment, since the base end portion 5t of the fastening portion 5 is welded to the circumferential continuous member 20L to form the welded portion F1 as the cutting guide portion 40 on the circumferential continuous member 20L and at the same time form the partially cut portion 41, such a concern can be eliminated.

[0104] Note that the partially cut portion 40 in the present embodiment is not limited to being formed only in one step (welding step S6) of forming the welded portion F1. For example, when the welded portion F1 is formed and then further conveyed downstream, a tension (tensile force) in the conveying direction is continuously applied to the circumferential continuous member 20L (and the formed welded portion F1 (cutting guide portion 40)). This includes cases where the partially cut portion 41 is formed by adjusting this tension (tensile force).

[0105] Further, the partial cut portion 41 formed along the cutting guide portion 40 by forming the welded portion F1 has a predetermined length in the CD direction of the circumferential continuous member 20L (see FIG. 11). Since the cutting guide portion 40 is a portion that guides the ventral circumferential portion 20 to be cut along the vertical direction from its upper end to its lower end when the product (diaper 1) is used, along the cutting guide portion 40, similarly, by forming the partial cut portion 41 having a predetermined length in the CD direction (the vertical direction of the product) of the circumferential continuous member 20L, the partial cut portion 41 can be formed without inhibiting the conveyance state.

[0106] Also, as shown in FIG. 11, in the welding step S6 of the present embodiment, it is preferable that at least a part of the partial cut portion 41 is formed so as to overlap the engaging portion 51 in the CD direction. By doing so, the partial cut portion 41 is positioned on the extension in the conveyance direction (the left - right direction of the product) of the engaging portion 51, that is, the partial cut portion 41 is positioned on the extension in the conveyance direction of the portion where the fastening portion 5 is fixed to the circumferential continuous member 20L by the engaging portion 51. Since the partial cut portion 41 is positioned at a portion where the extension of the circumferential continuous member 20L in the conveyance direction is more easily suppressed by the fastening portion 5, the opening of the partial cut portion 41 in the conveyance direction can be suppressed, and unnecessary unintended cutting of the circumferential continuous member 20L starting from the partial cut portion 41 can be prevented. If the opening of the partial cut portion 41 in the conveyance direction is not suppressed, for example, the entire width of the circumferential continuous member 20L in the CD direction may be cut along the cutting guide portion 40, and the circumferential continuous member 20L may be separated in the conveyance direction, which may cause defective products in the production line 100. However, by forming at least a part of the partial cut portion 41 so as to overlap the engaging portion 51 in the CD direction, such occurrence can be prevented.

[0107] Figs. 12A to 12C are diagrams showing a modification of the formation of the partial cut portion 41. As described above, the partial cut portion 41 can be formed simultaneously with the formation of the welded portion F1 as the cutting induction portion 40 in the welding step S6, but is not limited thereto. For example, as shown in Fig. 12A, the partial cut portion 41 may not be formed. Even if only the cutting induction portion 40 is formed without forming the partial cut portion 41, when the fastening portion 5 is pinched and pulled during product use, the ventral body circumferential portion 20 can be easily cut along the cutting induction portion 40.

[0108] Also, as shown in Fig. 12B, the partial cut portion 41 may be formed so as not to overlap with the engaging portion 51 in the CD direction. By providing the partial cut portion 41 in a portion that does not overlap with the engaging portion 51, the influence on the body circumferential continuous member 20L is reduced, and the risk of the cut of the body circumferential continuous member 20L spreading during conveyance can be reduced. In Fig. 12B, the partial cut portion 41 is provided at one end portion in the CD direction of the body circumferential continuous member 20L, but is not limited thereto, and may be provided at the other end portion in the CD direction of the body circumferential continuous member 20L. Further, as shown in Fig. 12C, in the welding step S6, a plurality of partial cut portions 41 may be provided at intervals in the CD direction.

[0109] FIG. 13 is an enlarged view for explaining the cutting guide portion 40. As shown in FIG. 13, the cutting guide portion 40 formed by the welding step S6 includes a first inclined portion 40A that inclines from the central portion in the CD direction of the circumferential continuous member 20L toward one side and the base end portion 5t side of the fixing portion 5, and a second inclined portion 40B that inclines from the central portion in the CD direction toward the other side and the base end portion 5t side of the fixing portion 5. The intersection point P of the first inclined portion 40A and the second inclined portion 40B is located closer to the tip portion 5s side than the outer end 40Ae in the CD direction of the first inclined portion 40A and the outer end 40Be in the CD direction of the second inclined portion 40B in the conveyance direction. The fixing portion 5 is a portion that grips the tip portion 5s and pulls it in the left-right direction (conveyance direction during manufacturing) when cutting the ventral circumferential portion 20 during use. By forming the inclination of the cutting guide portion 40 in such a shape, the pulling force is likely to be applied to the intersection point P which is the cutting starting point, and the force is propagated along the first inclined portion 40A and the second inclined portion 40B from there, so that the ventral circumferential portion 20 is easily cut along the cutting guide portion 40.

[0110] Also, in the above case, the partial cutting portion 41 preferably straddles the intersection point P of the first inclined portion 40A and the second inclined portion 40B of the cutting guide portion 40. By providing the partial cutting portion 41 straddling the intersection point P, since the circumferential continuous member 20L has already been cut at the portion of the intersection point P where the tension (tensile force) in the conveyance direction is likely to concentrate, it becomes easier to prevent the partial cutting portion 41 from expanding during subsequent conveyance.

[0111] Further, at least a part of the formed partial cutting portion 41 preferably overlaps with the temporary fixing portion 60 in the CD direction (FIGS. 11, 13, etc.). By doing so, the temporary fixing portion 60 will be located on the extension of the partial cutting portion 41 in the conveyance direction. The fixing of the fastening portion 5 to the circumferential continuous member 20L is strengthened by the temporary fixing portion 60 formed in the fastening portion temporary fixing step S5, and the elongation of the circumferential continuous member 20L in the conveyance direction (the left-right direction of the product) can be further suppressed. By such overlap of the temporary fixing portion 60 and the partial cutting portion 41 in the CD direction, the opening in the conveyance direction of the partial cutting portion 41 can be suppressed, and unnecessary cutting of the circumferential continuous member 20L starting from the partial cutting portion 41 during conveyance can be suppressed.

[0112] Also, as shown in FIGS. 11 and 13, when the upstream side in the conveyance direction of the fastening portion 5 (the tip portion 5s side in FIG. 11) is defined as the upstream side portion and the downstream side in the conveyance direction of the fastening portion 5 (the base end portion 5t side in FIG. 11) is defined as the downstream side portion with reference to the formed cutting guide portion 40, the total area of the temporary fixing portions 60 provided per unit area of the downstream side portion of the fastening portion 5 is larger than the total area of the temporary fixing portions 60 provided per unit area of the upstream side portion of the fastening portion 5. In the fastening portion 5 temporarily fixed by the fastening portion temporary fixing step S5, the downstream side portion is a portion where curling or displacement is likely to occur during conveyance. As shown in FIGS. 11 and 13, by forming a large number of temporary fixing portions 60 in such a downstream side portion, the occurrence of curling or the like during conveyance can be suppressed, and the welding step S6 performed after the fastening portion temporary fixing step S5 can be more easily and stably performed.

[0113] As described above, in the present embodiment, the circumferential continuous member 20L conveyed on the production line 100 includes a skin-side continuous sheet 21a (first sheet material) in which the skin-side sheet 21 (first sheet) is continuous in the conveying direction, a non-skin-side continuous sheet 22a (second sheet material) in which the non-skin-side sheet 22 (second sheet) is continuous in the conveying direction, and a circumferential elastic continuous member 23a in which the circumferential elastic member 23 is continuous in the conveying direction. The circumferential elastic continuous member 23a is joined in an extended state between the skin-side continuous sheet 21a (first sheet material) and the non-skin-side continuous sheet 22a (second sheet material) (see FIG. 9). In the diaper 1 manufactured by the manufacturing method of the diaper 1 of the present embodiment, in the portions where the circumferential continuous member 20L and the absorber 11 overlap in the thickness direction, and where the circumferential continuous member 30L and the absorber 11 overlap in the thickness direction, the circumferential elastic continuous members 23a and 33a are respectively cut so that the circumferential elastic continuous members 23a and 33a are discontinuous (see FIG. 2). Thereby, the stretchability in the left-right direction of the diaper 1 does not appear in the discontinuous portion, flatness is ensured, and shrinkage of the absorbent body 10 can be suppressed. Similarly, also in the welding step S6 of welding the fastening portion 5, it is preferable to cut the circumferential elastic continuous member 23a simultaneously by forming the welded portion F1. In the region where the fastening portion 5 exists, the circumferential elastic member 23 (circumferential elastic continuous member 23a) becomes discontinuous and stretchability does not appear, so that shrinkage of the region where the fastening portion 5 exists can be suppressed. By suppressing shrinkage, wrinkles and the like are less likely to occur in the fastening portion 5, and the usability of the product can be improved.

[0114] FIG. 14 is a diagram for explaining details of a welded portion F1, an auxiliary welded portion F2, and a part of the auxiliary welded portion F3. When forming the welded portion F1 in the above-described welding step S6, it is preferable to form the welded portion F1 such that a part of the welded portion F1 does not form a continuous line. Preferably, the welded portion F1 is formed such that at least the outer end portion of the welded portion F1 in the CD direction does not form a continuous line. In the present embodiment, as shown in FIG. 14, when forming the welded portion F1 in the welding step S6, a plurality of discontinuous portions 43 where the welded portion F1 does not form a continuous line are formed on both outer sides (one side and the other side) of the central portion of the welded portion F1 in the CD direction. The discontinuous portion 43 is a so-called non-welded portion. Since the welded portion F1 does not form a continuous line, the discontinuous portion 43 (non-welded portion) is in a state where a part of the circumferential continuous member 20L is connected without being welded. By forming the discontinuous portion 43 (non-welded portion) where a part of the circumferential continuous member 20L is connected together with the cutting induction portion 40 while forming the welded portion F1 (cutting induction portion 40), it is possible to prevent the circumferential continuous member 20L from being cut to the end portion in the CD direction during conveyance, and prevent the flow of the production line 100 from being interrupted.

[0115] Further, the fastening portion 5 has an engaging portion 51 that is separably engaged with the non-skin side surface of the circumferential continuous member 20L (ventral circumferential portion 20). However, as described above, when forming the discontinuous portion 43, the discontinuous portion 43 is preferably formed at a position that does not overlap the engaging portion 51 in the CD direction. When the cutting induction portion 40 is formed in the welding step S6, the engaging portion 51 is in a state of being separably engaged with the engaged portion 25 of the circumferential continuous member 20L. Therefore, in the region where the engaging portion 51 exists, since the circumferential continuous member 20L and the engaging portion 51 are engaged with each other, as described above, the opening in the conveyance direction of the partial cutting portion 41 can be suppressed, and the spread of tearing from the partial cutting portion 41 can be prevented. By forming the discontinuous portion 43 at a position that does not overlap the engaging portion 51, it becomes easier to suppress the spread of cutting starting from the partial cutting portion 41 even in the region where the engaging portion 51 does not exist.

[0116] In this embodiment, the discontinuous portions 43 are formed on both one side and the other side in the CD direction of the cutting induction portion 40 (welding portion F1), but the present invention is not limited thereto. The discontinuous portions 43 may be provided on at least one side in the CD direction of the cutting induction portion 40. Further, three discontinuous portions 43 are respectively formed on one side and the other side in the CD direction of the cutting induction portion 40 (welding portion F1), but the number of the discontinuous portions 43 may be one or plural. The length of the discontinuous portions 43 in the CD direction is preferably about 0.5 mm each, and the interval between the adjacent discontinuous portions 43 in the CD direction is preferably about 6 mm. Further, when the partial cutting portion 41 is formed at the central portion in the CD direction of the cutting induction portion 40 as in this embodiment, from the central position in the CD direction of the cutting induction portion 40 (the position of the intersection point P in FIG. 13), among the plurality of formed discontinuous portions 43, the distance to the discontinuous portion 43 located innermost in the CD direction is preferably about 29 mm apart as an example.

[0117] Further, simultaneously with the formation of the welding portion F1 in the welding step S6, auxiliary welding portions F2 and F3 different from the welding portion F1 are formed so as to be adjacent to the cutting induction portion 40 (welding portion F1) from the base end portion 5t side of the fixing portion 5 in the conveyance direction. However, as shown in the enlarged view of FIG. 14, at least a part of the discontinuous portion 43 overlaps with the auxiliary welding portion F2 (F3) in the CD direction. By forming the auxiliary welding portion F2 (F3), the tensile strength concentrated on the discontinuous portion 43 can be relaxed by the auxiliary welding portion F2 (F3). Thereby, it is possible to prevent the circumferential continuous member 20L from breaking in the conveyance direction during conveyance.

[0118] ===Others=== The above embodiment is for facilitating the understanding of the present invention and is not for limiting the interpretation of the present invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are included in the present invention.

[0119] FIG. 15 is a diagram for explaining a manufacturing method in the case where the fixing portions 5 are provided on both left and right sides of the disposable diaper 1. In the above-described embodiment, the method of manufacturing the disposable diaper 1 in which the fixing portion 5 is provided on one side in the left-right direction of the product has been described. However, as shown in FIG. 15, in the disposable diaper 1, the fixing portion 5 may be provided not only on one side but also on both sides in the left-right direction. In that case, mainly, in the fixing portion temporary fixing step S5 and the welding step S6 in the above-described embodiment, the fixing portions 5, 5 are respectively arranged such that the tip portions 5s of the respective fixing portions 5 face each other on both the upstream side and the downstream side in the conveyance direction, and are welded to the circumferential continuous member 20L. The forming methods of the welding portion F1 (cutting induction portion 40), the auxiliary welding portions F2, F3, and the partial cutting portion 41 at that time are the same as those in the above-described embodiment.

[0120] Further, in the above-described embodiment, the method of welding the fixing portion 5 to the circumferential continuous member 20L for forming the ventral circumferential portion 20 (welding step S6) has been described. However, the case of welding the fixing portion 5 to the circumferential continuous member 30L for forming the dorsal circumferential portion 30 can also be performed by the same method.

Explanation of Reference Numerals

[0121] 1 Disposable diaper (pants-type absorbent article) 1h Deployed diaper, 1hs Continuum of diapers 1hsb Continuum of diapers, 1s Continuum of pants-type diapers 2a Side joint portion, 2b Side joint portion 5 Fixing portion 5K Fixing portion base material sheet 5s Tip portion, 5t Base end portion 10 Absorbent main body 11 Absorbent body 11A Absorbent core 12 Top sheet 13 Second sheet 14 Side sheet 15 Back sheet 16 Exterior sheet 17 Leg circumferential elastic member 18 Leakage prevention wall elastic member 20 Ventral circumferential portion 20L Torso Circumference Continuous Member 20La One Side End 20Lb The Other Side End 21 Skin Side Sheet 21a Skin Side Continuous Sheet 22 Non-Skin Side Sheet 22a Non-Skin Side Continuous Sheet 23 Torso Circumference Elastic Member 23a Torso Circumference Elastic Continuous Member 25 Engaged Portion 30 Dorsal Torso Circumference Portion 30L Torso Circumference Continuous Member 31 Skin Side Sheet 31a Skin Side Continuous Sheet 32 Non-Skin Side Sheet 32a Non-Skin Side Continuous Sheet 33 Torso Circumference Elastic Member 33a Torso Circumference Elastic Continuous Member 40 Cutting Induction Portion 40A One Side Inclined Portion 40Ae Outer End 40B The Other Side Inclined Portion 40Be Outer End 41 Partial Cutting Portion 43 Discontinuous Portion 51 Engaging Portion 60 Temporary Fixing Portion (Joint Portion) 80 Thigh Portion 100 Manufacturing Line 105 Die Cutter Device 106 Repitch Device 106P Holding Pad 110 Heat Sealing Device 110a Heat Embossing Roll 110b Anvil Roll 115 Ultrasonic Welding Device

Claims

1. A method for manufacturing a pant-type absorbent article having a waist circumference portion and a fastening portion, comprising: a conveying step of conveying the waist circumference continuous member for forming the waist circumference portion in a conveying direction; a welding step of welding a base end portion of the fastening portion to the waist circumference continuous member to form a welded portion as a cutting induction portion on the waist circumference continuous member; A method for manufacturing a pant-type absorbent article, characterized by comprising the above steps.

2. The method for manufacturing a pant-type absorbent article according to Claim 1, wherein a partial cutting portion where a part of the waist circumference continuous member is cut is formed by forming the welded portion. A method for manufacturing a pant-type absorbent article, characterized by the above.

3. The method for manufacturing a pant-type absorbent article according to Claim 1 or 2, wherein when a direction intersecting the conveying direction is defined as the CD direction, the cutting induction portion is formed from one end to the other end of the waist circumference continuous member in the CD direction by forming the welded portion. A method for manufacturing a pant-type absorbent article, characterized by the above.

4. The method for manufacturing a pant-type absorbent article according to Claim 1 or 2, wherein when a direction intersecting the conveying direction is defined as the CD direction, the cutting induction portion has a first inclined portion inclined from a central portion in the CD direction toward one side and toward the base end portion side of the fastening portion, and a second inclined portion inclined from the central portion toward the other side and toward the base end portion side of the fastening portion, and when a portion of the fastening portion located on the opposite side of the base end portion in the conveying direction is defined as a tip portion, the intersection of the first inclined portion and the second inclined portion is located on the tip portion side in the conveying direction with respect to the outer end of the first inclined portion in the CD direction and the outer end of the second inclined portion in the CD direction. A method for manufacturing a pant-type absorbent article, characterized by the above.

5. The method for manufacturing a pant-type absorbent article according to Claim 2, wherein when a direction intersecting the conveying direction is defined as the CD direction, a partial cutting portion having a predetermined length in the CD direction of the waist circumference continuous member is formed along the cutting induction portion by forming the welded portion. A method for manufacturing a pant-type absorbent article, characterized by the above.

6. The method for manufacturing a pant-type absorbent article according to Claim 1 or 2, having a spacing change step of changing the attachment spacing of the fastening portion according to the product size before the welding step. A method for manufacturing a pant-type absorbent article, characterized by the above.

7. A method for manufacturing a pant-type absorbent article according to claim 6, wherein after the interval changing step and before the welding step, there is a temporary fixing step of forming a temporary fixing portion for temporarily fixing the fixing portion to the body circumferential continuous member A method for manufacturing a pant-type absorbent article, characterized by this.

8. A method for manufacturing a pant-type absorbent article according to claim 7, wherein in the temporary fixing step, among the fixing portions, a temporary fixing portion is not formed at the tip portion of the fixing portion that is located on the side opposite to the base end portion in the conveyance direction A method for manufacturing a pant-type absorbent article, characterized by this.

9. A method for manufacturing a pant-type absorbent article according to claim 7, wherein when the upstream side in the conveyance direction of the fixing portion is defined as the upstream side portion and the downstream side in the conveyance direction of the fixing portion is defined as the downstream side portion with reference to the cutting guide portion, the total area of the temporary fixing portions provided per unit area of the downstream side portion of the fixing portion is larger than the total area of the temporary fixing portions provided per unit area of the upstream side portion of the fixing portion A method for manufacturing a pant-type absorbent article, characterized by this.

10. A method for manufacturing a pant-type absorbent article according to claim 1 or 2, wherein the body circumferential portion has a first sheet, a second sheet, and a body circumferential elastic member provided between the first sheet and the second sheet, the body circumferential continuous member has a first sheet material in which the first sheet is continuous in the conveyance direction, a second sheet material in which the second sheet is continuous in the conveyance direction, and a body circumferential elastic continuous member in which the body circumferential elastic member is continuous in the conveyance direction, and the body circumferential elastic continuous member is joined in an extended state between the first sheet material and the second sheet material, in the welding step, by forming the welded portion, the body circumferential elastic continuous member is cut A method for manufacturing a pant-type absorbent article, characterized by this.

11. A method for manufacturing a pant-type absorbent article according to claim 1 or 2, wherein when the direction intersecting the conveyance direction is defined as the CD direction, in the welding step, the welded portion is formed so that the outer end portion of the welded portion in the CD direction does not become a continuous line A method for manufacturing a pant-type absorbent article, characterized by this.

12. A method for manufacturing a pant-type absorbent article according to claim 11, wherein the fixing portion has an engaging portion that separably engages with the non-skin side surface of the body circumferential portion, when the portion where the welded portion does not become a continuous line is defined as the discontinuous portion, The non - continuous portion is provided at a position that does not overlap with the engaging portion in the CD direction. A method for manufacturing a pants - type absorbent article, characterized by the above.

13. A method for manufacturing a pants - type absorbent article according to claim 2, wherein the fastening portion has an engaging portion that detachably engages with the non - skin side surface of the body - surrounding portion, when the direction intersecting the conveyance direction is defined as the CD direction, in the welding step, at least a part of the partial cutting portion is formed so as to overlap with the engaging portion in the CD direction A method for manufacturing a pants - type absorbent article, characterized by the above.

14. A method for manufacturing a pants - type absorbent article according to claim 2, wherein the fastening portion has an engaging portion that detachably engages with the non - skin side surface of the body - surrounding portion, when the direction intersecting the conveyance direction is defined as the CD direction, in the welding step, the partial cutting portion is formed so as not to overlap with the engaging portion in the CD direction A method for manufacturing a pants - type absorbent article, characterized by the above.

15. A method for manufacturing a pants - type absorbent article according to claim 2, when the direction intersecting the conveyance direction is defined as the CD direction, the cutting guide portion has a first inclined portion that inclines from the central portion in the CD direction toward one side and toward the base - end portion side of the fastening portion, and a second inclined portion that inclines from the central portion toward the other side and toward the base - end portion side of the fastening portion, the partial cutting portion is located across the intersection of the first inclined portion and the second inclined portion A method for manufacturing a pants - type absorbent article, characterized by the above.

16. A method for manufacturing a pants - type absorbent article according to claim 7, by forming the welding portion, a partial cutting portion is formed where a part of the body - surrounding continuous member is cut, when the direction intersecting the conveyance direction is defined as the CD direction, at least a part of the partial cutting portion overlaps with the temporary fastening portion in the CD direction A method for manufacturing a pants - type absorbent article, characterized by the above.

17. A method for manufacturing a pants - type absorbent article according to claim 12, in the welding step, when forming the welding portion, a supplementary welding portion different from the welding portion is formed by welding the base - end portion of the fastening portion to the body - surrounding continuous member, the supplementary welding portion is adjacent to the cutting guide portion from the base - end portion side of the fastening portion in the conveyance direction, and at least a part of the non - continuous portion overlaps with the supplementary welding portion in the CD direction A method for manufacturing a pants - type absorbent article, characterized by the above.

18. A manufacturing apparatus for a pant-type absorbent article having a waist portion and a fastening portion, a conveying unit that conveys the waist continuous member for forming the waist portion in a conveying direction, a welding forming unit that welds a base end portion of the fastening portion to the waist continuous member to form a welded portion as a cutting induction portion on the waist continuous member and comprising a manufacturing apparatus for a pant-type absorbent article, characterized by the above.

Images