WO2014208638A1 - パンツ型着用物品及びその製造方法 - Google Patents
パンツ型着用物品及びその製造方法 Download PDFInfo
- Publication number
- WO2014208638A1 WO2014208638A1 PCT/JP2014/066923 JP2014066923W WO2014208638A1 WO 2014208638 A1 WO2014208638 A1 WO 2014208638A1 JP 2014066923 W JP2014066923 W JP 2014066923W WO 2014208638 A1 WO2014208638 A1 WO 2014208638A1
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- WO
- WIPO (PCT)
- Prior art keywords
- wearing article
- exterior body
- pants
- type wearing
- seal
- Prior art date
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- B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
- B29C66/83431—Roller, cylinder or drum types; Band or belt types; Ball types rollers, cylinders or drums cooperating with bands or belts
- B29C66/83435—Roller, cylinder or drum types; Band or belt types; Ball types rollers, cylinders or drums cooperating with bands or belts said rollers, cylinders or drums being hollow
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F2013/15821—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing
- A61F2013/15861—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for bonding
- A61F2013/15878—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for bonding by thermal bonding
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/84—Accessories, not otherwise provided for, for absorbent pads
- A61F2013/8497—Accessories, not otherwise provided for, for absorbent pads having decorations or indicia means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
- B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
- B29C65/1619—Mid infrared radiation [MIR], e.g. by CO or CO2 lasers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
- B29C66/137—Beaded-edge joints or bead seals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/4871—Underwear
- B29L2031/4878—Diapers, napkins
Definitions
- the present invention relates to a pants-type wearing article having a side seal portion.
- a conventional pant-type wearing article includes an absorbent main body and an exterior body that forms the outer surface of the wearing article, and both side edges of the exterior body in the front body and both side edges of the exterior body in the back body are joined together.
- a pants-type disposable diaper in which a side seal portion is formed is known.
- Patent Document 1 discloses a three-stage joint to the side seal part from the viewpoint of sufficient joint strength that does not come off while wearing a diaper and improvement in tearability. It is described that the strengths coexist.
- a heat roll device has been widely used for joining stacked sheets.
- the side seal portion is heated as described later. It is formed using a roll device.
- a method of welding using laser light is also known.
- Patent Document 2 a sheet laminate in which a plurality of sheets are stacked is deformed into a shape along the peripheral surface of a rotary roll having a laser light transmitting portion on the peripheral surface, and the sheet is conveyed. A method of irradiating the laminated body with laser light from the inside of the rotary roll to fuse the sheets in the laminated sheet is described.
- a pants-type disposable diaper is usually manufactured through the following steps. That is, a diaper continuous body in which a plurality of diapers are arranged in one direction (conveying direction) is manufactured, and the front body side exterior body and the back body side of the diaper continuous body are overlapped with each other at a site where the side seal portion is to be formed. After the exterior body is joined by a joining means such as a heat roll device, the joint part is cut by a cutting means such as a cutter, thereby being divided into individual diapers.
- the side seal part of the conventional pants-type disposable diaper manufactured in this way is formed by overlapping the side edge part of the front body and the side edge part of the back body in the shape of a palm, and the top of the palm-shaped portion is Since it protrudes outward from the diaper than the part, it can be easily recognized visually.
- Patent Document 3 when joining the front and back body side edges of the non-stretchable elastic back sheet to make a pants-type diaper, the leg elastic body part is not joined and a slit is formed. It is described to form.
- the palm-shaped side seal part obtained through the above-described manufacturing process is likely to be relatively hard due to the wide joining width between the exterior bodies and the exterior bodies being strongly pressed during joining. There is room for improvement in terms of wearing feeling and touch of the outer surface.
- the joint width between the exterior bodies in the side seal portion is narrowed, the visual visibility is lowered in the wearing state or the natural state (contracted state) of the diaper, and it may be difficult to visually recognize the presence.
- the guardian for example, mother
- the present invention includes an exterior body that forms the outer surface of a worn article, and a pair of side seal portions, a waist opening, and both side edges of the exterior body in the front body and both side edges of the exterior body in the back body are joined together
- a pants-type wearing article in which a pair of leg openings is formed is provided.
- the side seal part is a continuous linear shape in which the edge of the exterior body in the front body and the edge of the exterior body in the back body extend in the longitudinal direction of the side seal part.
- the first method of the present invention is a polymerization pressurizing step of pressing the formation site of the side seal portion in the belt-shaped exterior body in a state where the front body side and the back body side are overlapped, While cutting the exterior body by irradiating a laser beam through a light passage portion extending in a direction intersecting the transport direction of the exterior body to the formation planned site of the side seal portion in a pressurized state And a side seal portion forming step of forming the side seal portion by fusing the cut edge portions of the laminated exterior body produced by the division.
- laser light is irradiated through a light passage portion having a wide portion and a narrow portion having mutually different widths, and the laser light is irradiated through the narrow portion.
- the sealing edge portion is formed, and the non-sealing portion is formed by laser light through the wide portion.
- this invention provides the manufacturing method of the said underpants type wearing article.
- the second method of the present invention is a polymerization pressurizing step for pressing the formation planned site of the side seal part in the belt-shaped exterior body in a state where the front body side and the back body side are overlapped, While cutting the exterior body by irradiating a laser beam through a light passage portion extending in a direction intersecting the transport direction of the exterior body to the formation planned site of the side seal portion in a pressurized state And a side seal portion forming step of forming the side seal portion by fusing the cut edge portions of the laminated exterior body produced by the division.
- a support member provided with a high-order part and a low-order part projecting toward the exterior body in the vicinity of the light passage part on the outer surface in contact with the exterior body.
- the seal edge is formed by irradiating a laser beam to a part strongly pressed by the high-order part, and the non-seal part is irradiated by a laser beam irradiating the part relatively weakly pressed by the low-order part.
- FIG. 1 is a schematic perspective view which shows an example of the manufacturing method of the underpants type disposable diaper using the laser type
- FIG. 2 is a perspective view schematically showing a pants-type disposable diaper of the basic technology manufactured by carrying out the manufacturing method shown in FIG.
- FIG. 3 is a cross-sectional view schematically showing a cross section taken along line II of FIG.
- FIG. 4 is a plan view schematically showing a developed and extended state of the diaper shown in FIG.
- FIG. 5 is a perspective view schematically showing a manufacturing process of the diaper continuous body shown in FIG. 1.
- FIGS. 7 (a) to 7 (c) show the side seal portion (seal edge) at the same time that the continuous diaper (strip-shaped exterior body) is cut using the laser type bonding apparatus shown in FIG. It is explanatory drawing explaining a mode that it forms.
- 8 (a) and 8 (b) are diagrams corresponding to FIG. 3 of the side seal part (seal edge part) on one side and the vicinity thereof in a state where the waist opening of the diaper shown in FIG.
- FIG. 10 is a view corresponding to a partially enlarged view of FIG. 6A in the first embodiment of the manufacturing method of the present invention.
- FIG. 11 shows, in the first embodiment of the manufacturing method of the present invention, a side seal portion formation scheduled portion in a portion corresponding to a non-seal portion of a continuous diaper (band-shaped exterior body) using a laser type bonding apparatus. It is explanatory drawing explaining the mode which shows a state [FIG.7 (c) equivalent figure].
- FIG. 12 is a schematic cross-sectional view showing a laser beam passage and its vicinity in the laser-type bonding apparatus used in the second embodiment of the manufacturing method of the present invention.
- FIG. 13 is a diagram showing a state in which the laser light passage portion and its vicinity in the laser type apparatus shown in FIG. 12 are viewed from the outer surface side of a cylindrical roll on which a diaper continuous body (band-shaped exterior body) is arranged. is there.
- FIG. 14 is a side view which shows 2nd Embodiment of the underpants type disposable diaper of this invention.
- FIG. 15 is a side view which shows 3rd Embodiment of the underpants type disposable diaper of this invention.
- FIG. 16 is a view corresponding to FIG. 7C of another example of a method for manufacturing a pants-type disposable diaper using the laser-type bonding apparatus shown in FIG.
- the present invention relates to a pants-type wearing article having a side seal portion excellent in flexibility or touch and having high visibility by visual observation of the side seal portion, and a manufacturing method thereof.
- One of the main features of the present invention includes an exterior body that forms an outer surface of a worn article, and a pair of side seals in which both side edges of the exterior body in the front body and both side edges of the exterior body in the back body are joined.
- a pant-type wearing article in which a waist opening and a pair of leg openings are formed, the side seal part is the edge of the exterior body in the front body and the edge of the exterior body in the back body is the side seal Device having a seal edge joined by a continuous linear fusion part extending in the longitudinal direction of the part (hereinafter also referred to as a side seal part visibility improving means). ).
- Adoption of this side seal portion visibility improving means is, for example, irradiating a predetermined portion of the belt-shaped exterior body in a state where the front body side and the back body side are overlapped in the manufacturing process of the pant-type wearing article, for example, with laser light, etc. Then, at the same time as dividing the outer body into lengths for individual wearing articles, the cut edges of the laminated outer body produced by the division are fused together to form a pair of side seal portions This is especially useful when The side seal portion formed by such a method has low visibility when worn on (wearing state), and is particularly worn from the viewpoint of tearing the side seal portion to remove the worn article from the body. It is useful to improve the visibility of the side seal part at the time.
- such a side seal part is also a side seal part with low visual visibility even in the natural state (contracted state) of the worn article, it is also for the purpose of identifying the worn article before and after and on the left and right. It is also useful to improve the visibility of the side seal part in the natural state (contracted state before wearing) of the worn article.
- pant-type wearing article of a basic technology and a method for manufacturing the same that can apply the side seal portion visibility improving means employed in the present invention will be described, and then the present invention to which the side seal portion visibility improving means is applied.
- Preferred embodiments of the pants-type wearing article and the manufacturing method thereof will be described.
- FIG. 1 The outline of the manufacturing method of the underpants type disposable diaper using the laser type
- a diaper 1 that is a manufacturing object of a manufacturing method using this laser type bonding apparatus includes an absorbent main body 2 and an exterior body 3 that forms the outer surface of a wearing article.
- a pants-type disposable diaper in which B1 and B1 are joined to form a pair of side seal portions 4 and 4, a waist opening 8 and a pair of leg openings 9 and 9.
- the exterior body 3 is positioned on the non-skin contact surface side of the absorbent main body 2 and fixes the absorbent main body 2.
- the pair of side seal portions 4, 4 in the diaper 1 extends in the longitudinal direction of the side seal portion 4, with the edge of the exterior body 3 in the front body F and the edge of the exterior body 3 in the back body R, respectively.
- the sealing edge part 41 couple
- the diaper 1 has a longitudinal direction X corresponding to the wearer's front-rear direction and a lateral direction Y orthogonal to the wearer's front-rear direction in a developed and extended plan view as shown in FIG.
- the diaper 1 can be divided into a crotch part 1C arranged at the crotch part at the time of wearing, and an abdominal side part 1A and a back side part 1B located in the longitudinal direction X.
- the exterior body 3 in the crotch part 1 ⁇ / b> C is formed with recesses for forming leg openings 9, 9 at the left and right side edges along the vertical direction X.
- the diaper 1 can be divided into a front body F and a back body R with a virtual center line CL that bisects the diaper 1 in the vertical direction X as a boundary.
- a skin contact surface is a surface directed to a wearer's skin side at the time of wearing in a pants type wearing article or its constituent member (for example, an absorptive main part), and a non-skin contact surface is In the pants-type wearing article or its constituent members, it is a surface directed to the side opposite to the wearer's skin side (clothing side) when worn.
- the vertical direction X corresponds to the direction (longitudinal direction) along the long side of the absorbent main body 2 which is a disposable diaper or its constituent member
- the horizontal direction Y is the absorbent which is a disposable diaper or its constituent member. It coincides with the width direction of the main body 2.
- the absorbent main body 2 has a vertically long shape in one direction (longitudinal direction X), and a surface sheet (not shown) that forms a skin contact surface; A back sheet (not shown) that forms a non-skin contact surface, and a liquid-retaining absorbent (not shown) interposed between the two sheets. And has a long shape in the same direction.
- the absorbent main body 2 is joined to a central portion of the outer package 3 by a known joining means (adhesive or the like) so that the longitudinal direction thereof coincides with the longitudinal direction X of the diaper 1 in the unfolded and extended state.
- the expanded and extended state means that the side seal portion is peeled off, the diaper is set in the expanded state, the elastic member of each part is expanded in the expanded diaper, and the design dimensions (the influence of the elastic member is eliminated at all). In this state, it is expanded until it becomes the same size as when expanded in a flat shape.
- the outer package 3 is arranged on the outer layer sheet 31 that forms the outer surface of the diaper 1 (non-skin contact surface of the outer package 3), and on the inner surface side of the outer layer sheet 31.
- An inner layer sheet 32 that forms the inner surface of 1 (skin contact surface of the exterior body 3), and a plurality of thread-like or belt-like elastic members 5, 6, and 7 fixed between the sheets 31 and 32 with an adhesive. It is configured to include.
- the two sheets 31 and 32 are joined to each other at a predetermined site by an adhesive or heat seal (not shown).
- the exterior body 3 (the outer layer sheet 31 and the inner layer sheet 32) includes a resin material and is formed using the resin material as a main component.
- the resin material includes a heat-sealable synthetic resin such as polyethylene, polyethylene terephthalate, and polypropylene.
- the nonwoven fabric include air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and melt blown nonwoven fabric.
- the manufacturing method of the diaper 1 exists in the superposition
- polymerization pressurization process which makes the formation planned site
- the belt-shaped outer package 3 (outer layer sheet 31, inner layer sheet 32) is folded in the width direction.
- the front body side and the back body side of the strip-shaped exterior body 3 to which the absorbent main body 2 is fixed are overlapped with each other, whereby “a precursor of a pants-type disposable diaper in which a side seal portion is not formed is unidirectional.
- a continuous diaper 10 is produced.
- sticker part formation process as shown in FIG. 1, the strip
- the pants comprising the exterior body 3 having a pair of side seal portions 4 and 4 by fusing the cut edges of the plurality of exterior bodies 3 (the outer layer sheet 31 and the inner layer sheet 32) in a laminated state generated by The mold disposable diaper 1 is continuously manufactured.
- the waist elastic member 5 forming the waist gather, the waist elastic member 6 forming the waist gather, and the leg elastic member 7 forming the leg gather have a predetermined elongation rate.
- a plurality of each are arranged in the stretched state.
- the leg elastic member 7 is arranged while forming a predetermined leg-circumferential pattern via a known swing guide (not shown) that reciprocates perpendicular to the sheet flow direction.
- an adhesive coating machine (see FIG. (Not shown) to apply hot melt adhesive.
- the elastic members such as the waist elastic member 5 and the waistline elastic member 6 are divided by the laser light irradiation in both the sheets 31 and 32 (parts where the side seal portion 4 is to be formed, FIG. 6A).
- 6B in the case where it is arranged in an extended state so as to straddle the portion to be divided indicated by reference numeral 10C), there are problems such as significant shrinkage of the elastic member after the division and disconnection of the elastic member.
- a hot melt adhesive is intermittently applied to the waist elastic member 5 and the waist elastic member 6 by an adhesive application machine (not shown) before being arranged between the sheets 31 and 32. May be.
- a plurality of joint portions for joining the belt-like outer layer sheet 31 and the belt-like inner layer sheet 32 between the two adjacent waistline elastic members 6 and 6, It is also preferable to use a convex roll and a corresponding joining means (not shown) such as an anvil roll. Thereafter, if necessary, a plurality of waistline elastic members 6 and a plurality of leg portion elasticities are made by using elastic member precut means (not shown) so as to correspond to positions where the absorbent main body 2 described later is disposed. The member 7 is pressed and divided into a plurality of pieces so that the contraction function is not expressed. Examples of the elastic member precut means include an elastic member dividing portion used in the method for manufacturing a composite elastic member described in JP-A-2002-253605.
- an adhesive such as a hot melt adhesive is applied in advance to the absorbent main body 2 manufactured in a separate process (not shown), and the absorbent main body 2 is rotated by 90 degrees. Then, it is intermittently supplied and fixed on the inner layer sheet 32 constituting the strip-shaped outer package 3.
- the adhesive for fixing the absorbent main body may be preliminarily applied not to the absorbent main body 2 but to the position where the absorbent main body 2 is arranged in the inner layer sheet 32.
- leg hole LO ' is formed inside the annular part enclosed by the leg part elastic member 7 in the strip
- This leg hole forming step can be carried out by using a technique similar to that in a conventional method for manufacturing this type of article, such as a rotary cutter and a laser cutter.
- the leg hole is formed after the absorbent main body 2 is arranged on the belt-shaped outer package 3, but the leg hole may be formed before the absorbent main body 2 is arranged.
- the strip-shaped exterior body 3 is folded in the width direction (a direction perpendicular to the conveying direction of the exterior body 3). More specifically, as shown in FIG. 5, both side portions 3 a, 3 a along the transport direction of the strip-shaped exterior body 3 are folded back so as to cover both ends in the longitudinal direction of the absorbent main body 2. After fixing both ends in the longitudinal direction, the outer package 3 is folded in the width direction together with the absorbent main body 2 (polymerization step in the polymerization pressure step). In this way, the diaper continuous body 10 is obtained.
- the diaper continuous body 10 thus manufactured is irradiated with laser light using a laser bonding apparatus 20 to form a pair of side seal portions 4 and 4 (side seal portion).
- a pants-type disposable diaper 1 having an exterior body 3 having a pair of side seal portions 4 is continuously manufactured.
- the laser type bonding apparatus 20 will be described.
- the laser type bonding apparatus 20 is arranged in a hollow cylindrical roll 23 that is rotationally driven in the direction of arrow A and a hollow portion of the cylindrical roll 23 as shown in FIG.
- a belt-type pressure device 26 including an irradiation head 35 that irradiates a laser beam 30 toward a cylindrical (annular) support member 21 that forms a peripheral surface portion 23, and an endless pressure belt 24 (pressing member).
- the laser-type joining device 20 includes a tension adjusting mechanism (not shown) that can adjust the tension of the pressure belt 24 wound around the outer peripheral surface of the annular support member 21 (the peripheral surface portion of the cylindrical roll 23). By adjustment, the pressure applied to the diaper continuous body 10 (sheet laminated body) can be appropriately adjusted by the support member 21 and the pressure belt 24.
- the support member 21 forms a peripheral surface portion (contact portion with the workpiece) of the cylindrical roll 23, and is between a pair of annular frames 22, 22 that form both ends of the cylindrical roll 23 in the rotation axis direction. It is pinched and fixed.
- the support member 21 is made of a metal material such as iron, aluminum, stainless steel, or copper, or a material having heat resistance such as ceramics.
- the support member 21 has a light passage portion 27 through which laser light can pass. As shown in FIG. 1, FIG. 6A and FIG. 6B, the support member 21 has a slit-like opening 27 that penetrates the support member 21 in the thickness direction as a light passage portion. .
- the opening 27 has a rectangular shape in plan view, and the longitudinal direction of the opening 27 intersects with the conveyance direction A of the diaper continuous body 10 (band-shaped exterior body 3).
- a plurality of cylinders are formed at predetermined intervals in the circumferential direction of the cylindrical support member 21 so as to coincide with the direction parallel to the axial length direction of the rotation shaft (the direction indicated by the symbol X in FIG. 6A).
- the support member 21 allows the laser light to pass through the opening 27, but does not allow the laser light to pass (transmit) at portions other than the opening 27.
- a method of forming the opening 27 in the support member 21 1) etching, punching, laser processing, or the like at a predetermined position of the support member 21 made of a single annular member having the same length as the circumferential length of the annular frame 22. 2)
- the support member 21 is replaced with a single annular member, and a plurality of curved rectangular members are used as the support member 21, and the plurality of members are connected between the pair of frames 22, 22.
- a method of arranging the frame body 22 at a predetermined interval in the circumferential direction may be mentioned.
- the interval between two adjacent members forms a slit-shaped opening 27.
- the method 2) is used.
- a support member 21A having an opening 27A (light passage portion) having a wide portion and a narrow portion having different widths from each other is used as the support member 21, in the vicinity of the opening 27 (light passage portion) on the surface in contact with the strip-shaped exterior body 3, on the exterior body 3 side.
- a support member 21B provided with a high-order part and a low-order part that protrude from each other is used as the support member 21 in the vicinity of the opening 27 (light passage portion) on the surface in contact with the strip-shaped exterior body 3, on the exterior body 3 side.
- each of these members is the cylindrical shape of the cylindrical roll 23. It is rotationally moved in a curved state corresponding to the peripheral surface portion.
- a light passage portion through which laser light can pass is a support member.
- the parting portion 10C that overlaps with the opening 27 itself is not sandwiched between the members 21 and 24, but the vicinity thereof, that is, the portion that overlaps with the vicinity of the opening 27 (opening edge) in the diaper continuous body 10. Is sandwiched between the two members 21 and 24, and therefore does not move before and after the irradiation of the laser beam, and therefore, the cutting edge portion generated by the division of the diaper continuous body 10 by the irradiation of the laser beam does not move. That is, the parting planned portion 10C of the diaper continuous body 10 (portion overlapping the opening 27 in the sheet laminate) is a portion restrained by the pressing force between the members 21 and 24, and the pressing force is practically the same. It is an affected part.
- the support member 21 has a recess 28 on its outer surface (contact surface with the workpiece).
- a plurality of recesses 28 are formed at predetermined intervals in the circumferential direction of the cylindrical support member 21, and a slit-shaped opening 27 is formed in a region (convex part) located between two adjacent recesses 28, 28. Is formed.
- the opening 27 is formed in the center in the circumferential direction of the cylindrical support member 21 in the convex portion.
- the relative thickness of the diaper continuous body 10 is relatively small. It is possible to introduce the diaper continuous body 10 onto the outer surface of the support member 21 so that a large portion (for example, an arrangement region of the absorbent main body 2) is accommodated in the recess 28. Then, when the diaper continuous body 10 is introduced onto the support member 21 in such a manner, as shown in FIG. 6B, the contact surface (the other surface) of the diaper continuous body 10 with the pressure belt 24 (pressing member).
- the belt-type pressure device 26 includes an endless pressure belt 24 (pressing member) and three rolls 25a, 25b, and 25c that rotate while the pressure belt 24 is stretched.
- the rolls 25a, 25b, and 25c may be drive rolls or driven rolls that rotate with the pressure belt 24.
- the pressure belt 24 moves at the same speed as the cylindrical roll 23 (supporting member 21) by using any one or more of the rolls 25a, 25b, and 25c as a driving roll or rotating with the cylindrical roll 23.
- the support member 21 and the pressure belt 24 are preferably maintained in a predetermined temperature range by air cooling, water cooling, or the like.
- a metal or resin belt having heat resistance capable of withstanding the heat generated during processing can be used, for example, a metal material such as iron, aluminum, stainless steel, or the like. Can be used.
- a belt that does not transmit the laser beam irradiated to the workpiece strip-shaped outer package 3 is usually used. You can also.
- an irradiation head 35 that irradiates a laser beam 30 toward a support member 21 that forms a peripheral surface portion of the cylindrical roll 23 is provided in the hollow portion of the hollow cylindrical roll 23.
- the irradiation head 35 is a galvano scanner (device having a mirror on the motor shaft) that freely scans the laser light 30, and the laser light 30 is in a direction parallel to the rotation axis of the cylindrical roll 23 (reference numeral in FIG. 6A).
- a mechanism for making the spot diameter of the laser beam 30 constant is provided.
- the laser irradiation mechanism has such a configuration, so that the irradiation point of the laser light 30 is the circumferential direction of the cylindrical roll 23 and a direction orthogonal to the circumferential direction (a direction indicated by a symbol X in FIG. 6A). It can be arbitrarily moved in both directions of a direction parallel to the rotation axis of the roll 23).
- the diaper continuous body 10 includes a support member 21 that forms a peripheral surface portion of a cylindrical roll 23 that is rotationally driven in the direction of arrow A in a state where a predetermined tension is applied by a guide roll (not shown). After being transported by a predetermined distance in the circumferential direction by rotation of the cylindrical roll 23 so as to be wound around the support member 21, it is separated from the support member 21 by an unillustrated lead roll, nip roll or the like. . As described above, the diaper continuous body 10 is wound around the support member 21 forming the peripheral surface portion of the cylindrical roll 23 with a predetermined tension and is conveyed so as to be in pressure contact with the pressure belt 24.
- the portion sandwiched between the support member 21 and the pressure belt 24 and the vicinity thereof are in a state of being pressurized (compressed) in the thickness direction from before being divided by the laser light irradiation.
- the diaper continuous body 10 contains a nonwoven fabric, the diaper continuous body 10 can be more efficiently compressed, and as a result, the diaper continuous body 10 being compressed is irradiated with laser light.
- this it becomes possible to fuse the cut edges of the plurality of sheets (exterior body 3) constituting the divided portion more reliably, and the side seal portion 4 can be fused. The strength is improved.
- the rotation angle of the support member 21 (cylindrical roll 23) from when the diaper continuous body 10 is introduced onto the support member 21 to when the diaper continuous body 10 leaves the diaper continuous body 10 can be, for example, 90 degrees or more and 270 degrees or less. Is 120 degrees or more and 270 degrees or less.
- the range of the angle (pressure contact angle) at which the diaper continuous body 10 is pressed against the support member 21 by the pressure belt 24 (pressing member) is the entire circumference of the cylindrical support member 21 (cylindrical roll 23). When the pressure contact is 360 degrees, it is preferably 90 degrees or more and 270 degrees or less, and more preferably 120 degrees or more and 270 degrees or less.
- one surface 10a forms the peripheral surface portion of the cylindrical roll 23 and laser light.
- a continuous diaper brought into contact with the outer surface of the support member 21 having a slit-like opening 27 (light passage portion) through which 30 can pass and brought into a pressurized state by the support member 21 and the pressure belt 24 (pressing member).
- the body 10 part where the side seal portion 4 is to be formed
- the diaper continuous body 10 is divided at the same time.
- the cut edges of the plurality of sheets (exterior body 3) in the pressurized state are fused together to form the side seal portion 4 (side seal portion forming step).
- FIG. 7 is a diagram for explaining how the side seal portion 4 (seal edge) is formed at the same time as the diaper continuous body 10 (band-shaped sheet laminate) is divided using the laser bonding apparatus 20.
- 7 (a) schematically shows a portion 10C (part where the side seal portion 4 is to be formed) scheduled to be divided by the laser beam 30 of the diaper continuous body 10 and its vicinity.
- the diaper continuous part 10C of the diaper continuous body 10 in the illustrated embodiment is the center in the longitudinal direction (conveying direction A) in the region where the absorbent main body 2 of the diaper continuous body 10 is not disposed. It is. 10 C of such parting plan parts are the opening edge part of the waist opening part 8 (refer FIG.
- the 8 layer structure part on which 8 sheets were piled up, and other parts are 4 sheets. It is a four-layer structure part that is superimposed.
- the four-layer structure portion includes two sheets (an outer layer sheet 31 and an inner layer sheet 32) constituting one exterior body 3 in the ventral side part 1A, and a back side part 1B. It consists of the same two sheets 31 and 32 that constitute one exterior body 3, and these four sheets are laminated.
- the eight-layer structure portion is folded so that both side portions 3a and 3a of the strip-shaped outer package 3 cover both longitudinal ends of the absorbent main body 2 when the diaper continuous body 10 is manufactured ( (See FIGS.
- the sheets (inner layer sheet 32) absorb the laser beam 30 and generate heat.
- all of the four sheets 31 and 32 constituting the parting planned portion 10 ⁇ / b> C are sheets (nonwoven fabrics) that absorb the laser beam 30 and generate heat.
- the two sheets of the outer layer sheet 31 and the inner layer sheet 32 that overlap each other in the vicinity of the portion 10C to be divided may be joined by an adhesive or the like before the irradiation with the laser beam 30, or may be joined at all. It is not necessary.
- the diaper continuous body 10 has one surface 10 a abutting against the support member 21, and a parting planned portion 10 ⁇ / b> C (part where the side seal portion 4 is to be formed) is on the slit-shaped opening 27.
- the pressure belt 24 pressing member
- the pressure belt 24 is pressed against the other surface 10b so that it is conveyed in the direction of the arrow A while being introduced onto the support member 21 that rotates in the direction of the arrow A so as to be positioned in the direction of the thickness A.
- Pressure compression
- the laser beam 30 is irradiated through the opening part 27 from the supporting member 21 side with respect to the parting part 10C to be divided in such a conveyance and pressurization state.
- the irradiation point of the laser beam 30 is configured to be arbitrarily movable in the circumferential direction of the cylindrical roll 23, and is set to scan following the movement of the opening 27 along the circumferential direction. Therefore, the laser beam 30 is continuously irradiated for a certain period of time to the parting planned portion 10C located on the opening 27 during the conveyance.
- the forming materials (fibers, etc.) of the sheets 31 and 32 existing in the parting portion 10C are vaporized by the heat generated by the direct irradiation of the laser light 30 and disappear.
- the forming material existing in the vicinity of the parting portion 10 ⁇ / b> C is indirectly heated by the laser beam 30 and melted.
- the parting plan part 10C of a four-layer structure is melted, and in a form in which a single sheet sheet laminate (diaper precursor) is cut from the diaper continuous body 10,
- the cut edges of the four sheets 31 and 32 in the sheet laminate of the single sheets produced by the division, and the diaper continuous 10 are fused together.
- Each of these cut edges is pressed (compressed) by being sandwiched between the support member 21 and the pressure belt 24 from before the formation (before the diaper continuous body 10 is divided by irradiation with the laser beam 30). ).
- the strip-shaped exterior body 3 is divided by the single laser light irradiation, and the exterior body 3 in the two pressurized states generated by the division is thus obtained.
- the fusion and separation are the same with approximately half the laser output compared to the method of fusing the two fusion places with two laser irradiations. It can be carried out in a process, and the diaper 1 can be manufactured efficiently.
- the cut edges of the sheets 31 and 32 are heated and melted during the irradiation of the laser beam 30 and immediately after the end of the irradiation, but are separated from the diaper continuous body 10 by the irradiation of the laser beam 30.
- Each of the leaf diaper precursor and the diaper continuum 10 is maintained in the pressurized state by the support member 21 and the pressure belt 24, and after the irradiation is completed, the air is applied to the outside air, the support member 21 and the pressure belt 24.
- the material is quickly cooled and solidified by heat transfer to form the fused portion 40 in which the forming material (fibers, etc.) of the cut edge is fused and integrated.
- the fused part 40 one of the pair of side seal parts 4, 4 in one diaper 1 is formed.
- the cutting edge portions of the sheets 31 and 32 may be forcibly cooled by using known cooling means such as a suction device and an exhaust device to promote the formation of the fused portion 40.
- the laser beam 30 seems to hit another opening 27 adjacent to the irradiation direction in the direction opposite to the conveyance direction A. And is irradiated to another parting planned portion 10C located thereabove through the other opening 27.
- another part 10C to be divided is divided and fused in the same manner as described above, and the other side seal part 4 (fused part 40) that forms a pair with the previously formed side seal part 4 is formed.
- the pants-type disposable diaper 1 including the exterior body 3 having the pair of side seal portions 4 and 4 is continuously manufactured.
- the diaper is larger than the width W of the slit-shaped opening 27 irradiated with the laser beam 30 (see FIG. 7B.
- the portion 27 may be located at a portion sandwiched between a pair of opening edges along a direction orthogonal to the conveyance direction A. That is, in the diaper continuous body 10, even in a portion that is not sandwiched between the support member 21 and the pressure belt 24 (pressing member), in the vicinity of the opening 27 (opening edge), that is, as described above, The fused part 40 can be formed if the pressure applied by the clamping between the members 21 and 24 is practically affected.
- the side seal portion 4 includes an edge portion 3F of the outer body 3 in the front body F and an edge portion 3R of the outer body 3 in the rear body R.
- the sealing edge part 41 couple
- the seal edge 41 has a cross section orthogonal to the direction in which the side seal part 4 extends when worn, and the outer edge 4a composed of the fused part 40 is a worn article. It has a shape recessed toward the inside.
- the fused portion 40 in the seal edge portion 41 has a narrow width W4 that appears on the outer surface of the diaper in the same cross section, and the width W4 is preferably 5 mm or less, more preferably 3 mm or less, and even more preferably 2 mm or less. It is.
- the direction where the side seal part 4 is extended in the planar state which accumulated the abdominal side part 1A (exterior body F) and the back side part 1B (rear body part R), the direction where the side seal part 4 is extended.
- the seal edge 41 of the side seal portion 4 generated by the division is an outer edge 4a formed by the outer edge of the fused portion 40.
- a fusion arcuate part 40 is formed between the four sheets 31 and 32 constituting the outer package 3 inside the diaper 1 including the outer edge 4a and the inner side of the diaper 1 rather than the outer arc 4a.
- melting part 40 has a width
- the side seal portion 4 is harder and softer than other parts of the diaper 1 due to the presence of the fused portion 40 formed by melting and solidifying the sheet forming material, and causes the feeling of wearing the diaper 1 to be reduced.
- the fusion part 40 is formed in a crescent shape or a half moon shape in a cross-sectional view in the width direction of the diaper 1 as described above, the fusion part in the conventional side seal part (for example, in Patent Document 1) Compared to the case where it is formed in a rectangular shape in the same sectional view as shown in FIG. 1 (part indicated by reference numeral 9), the corner 3S of the side edge portion of the exterior body 3 constituting the side seal portion 4 is formed.
- the wearing feeling of the diaper is improved as compared with the conventional product.
- the central portion in the thickness direction of the side edge of the exterior body 3 (the corner 3S on the one surface side of the exterior body 3 and the 3S on the other surface side, which is a part that greatly affects the fusion strength of the side seal portion 4) Since a sufficient amount of the fused portion 40 exists in the center portion between the side portions), the side seal portion 4 has a practically sufficient fusion strength, and the side seal portion 4 is worn while the diaper 1 is worn. Inconveniences such as tearing of the seal 4 hardly occur.
- the side seal part 4 (fusion
- 8A and 8B show the side seal portion 4 (fused portion 40) in a state where the waist opening 8 is expanded when the diaper 1 is worn. In the state where the waist opening 8 is expanded, the side seal portion 4 is normally in a state where the fused portion 40 is exposed as shown in FIG. 8A, but the outer edge 4a of the side seal portion 4 is the exterior. It is difficult to visually recognize from the outside due to the convex arc shape toward the inside of the body 3 and the fact that the fused portion 40 is smaller than the conventional side seal portion (fused portion).
- the outer edge 4a of the side seal portion 4 has a convex arc shape toward the inside of the exterior body 3, so that depending on the forming material of the sheets 31, 32, as shown in FIG.
- the corner 3S of the side edge of the exterior body 3 on the abdominal side 1A side and the corner of the side edge of the exterior body 3 on the back side 1B side The portion 3S may approach and the separation distance between the corner portions 3S and 3S may be reduced. Therefore, the fusion part 40 located between the two corners 3S and 3S is difficult to touch by the hand and is located on the outer side of the diaper 1 closer to the diaper 1 than the fusion part 40. Therefore, not only the feeling of wearing the diaper 1 but also the appearance is improved.
- the laser beam irradiated to the diaper continuous body 10 is absorbed by the sheets (the outer layer sheet 31 and the inner layer sheet 32) constituting the outer package 3 to generate heat.
- a laser beam having a wavelength is used.
- the “sheet constituting the exterior body” is not limited to the sheet (for example, the outer layer sheet 31 in the above-described embodiment) constituting one surface of the exterior body (the contact surface with the support member 21). Any sheet may be used as long as the sheet is configured. Whether or not the laser light applied to the exterior body has an oscillation wavelength that is absorbed by the sheet and generates heat for the individual sheets constituting the exterior body depends on the material of the sheet and the laser light to be used.
- the laser beam may be CO 2 laser, YAG It is preferable to use a laser, an LD laser (semiconductor laser), a YVO4 laser, a fiber laser, or the like.
- the oscillation wavelength that can be absorbed by the sheet and cause the sheet to generate heat is, for example, 8.0 ⁇ m or more and 15 It is preferable to use 0.0 ⁇ m or less, and it is particularly preferable to use an oscillation wavelength of 9.0 ⁇ m or more and 11.0 ⁇ m or less of a CO 2 laser in which a high-power laser device exists.
- the spot diameter of laser light, laser output, and the like can be appropriately selected in consideration of the material and thickness of the sheet constituting the exterior body.
- the diaper 1 which comprises is excellent in the softness
- the side seal portion 4 is more outward than the peripheral portion of the side seal portion 4 at least on the outer surface and inner surface of the diaper 1 when worn. Since the state of the outer surface and the inner surface of the diaper 1 does not substantially change across the side seal portion 4, it is difficult to visually recognize the side seal portion 4 from the outside, and the visibility of the side seal portion 4 is visually recognized. Low.
- the diaper 1 is provided with means for improving the side seal part visibility.
- FIG. 9 shows a first embodiment of the pant-type wearing article of the present invention (pants-type disposable diaper 50A).
- the pair of side seal portions 4A in the diaper 50A of the first embodiment is similar to the pair of side seal portions 4 in the diaper 1 described above, and the outer edge portion 3F of the outer body 3 in the front body F and the outer body 3 in the rear body R.
- the edge portion 3R has a seal edge portion 41 joined by a continuous linear fusion portion 40 extending in the longitudinal direction of the side seal portion 4A.
- the structure and forming method of the seal edge 41 are the same as the seal edge 41 in the diaper 1 described above.
- the difference between the diaper 50A of the first embodiment and the diaper 1 described above is that, in a part of the side seal portion 4A, the edge 3F of the exterior body 3 in the front body F and the back body R are as shown in FIG.
- the edge part 3R of the exterior body 3 is a point which has the non-seal part 42 which opposes in a non-bonded state.
- the edge 3F of the outer body 3 on the front body F side and the edge 3R of the outer body 3 on the rear body R side are worn by the wearer. They are opposed to each other in the waistline direction.
- the edge 3F of the outer body 3 on the front body F side and the edge 3R of the outer body 3 on the rear body R side may face each other, but at least in a worn state It is preferable that a gap is generated between the two.
- the outer layer sheet 31 and the inner layer sheet 32 are fused at the cut end portions of the edge portion 3F and the edge portion 3R in the non-seal portion 42 of the diaper 50A.
- the side seal portion 4A is formed by forming the seal edge portion 41 similar to the seal edge portion 41 of the diaper 1, the side seal portion 4A has flexibility and touch.
- the non-seal part 42 functions as a side seal part visibility improving means, and the side seal part 4A is also visually visible.
- the non-seal part 42 in the present invention is generated between both edge parts 3F and 3R which are not coupled to each other in the non-seal part 42 when the wearing article is worn (wearing state) from the viewpoint of improving the visibility of the side seal part 4A. It is preferable that the wearer's skin is visible from the outside through the gap. From the viewpoint of enhancing the visibility of the side seal portion 4A and ensuring the fusion strength required for the side seal portion 4A, the length L2 of the non-seal portion 42 is the length of the seal edge portion 41 and the length of the non-seal portion 42.
- the total length L4 of the side seal portion 4A is preferably 1% or more, more preferably 2% or more, and preferably 40% or less, more preferably 35% or less.
- the length L2 of the non-seal part 42 is preferably 2 mm or more, more preferably 4 mm or more, and preferably It is 40 mm or less, more preferably 35 mm or less.
- the outer body 3 in the front body F and the outer body 3 in the rear body R are each provided with the elastic member 6 between the two sheets 31 and 32.
- at least one elastic member 6 is disposed at each of the portions located on both sides (both sides in the waistline direction) of the non-seal portion 42 as shown in FIG. Has been.
- the diaper 50A of the first embodiment As the support member 21 in the laser-type bonding apparatus 20 described above, as shown in FIG. A support member 21A having an opening 27A (light passage portion) having 52 and narrow portions 51 and 53 is used.
- the diaper 50A of the first embodiment is manufactured in the same manner as the manufacturing method described in the basic technique except that the support member 21A is used.
- the diaper continuous body 10 (band-shaped exterior body 3) in a state where the front body side and the back body side are overlapped is introduced into a cylindrical roll 23 having a peripheral surface portion made of a support member 21A.
- the opening 27A is formed with respect to the formation planned portion 10C of the side seal portion of the diaper continuous body 10 (band-shaped outer package 3) while applying pressure between the pressure belt 24 and the support member 21A.
- the laser beam 30 is irradiated.
- the portion 10C to be formed of the side seal portion the portion irradiated with laser light through the narrow portions 51 and 53 is the same as the laser light irradiation shown in FIG.
- the exterior body 3 By irradiating the laser beam 30 to the diaper continuous body 10 in a state where a plurality of exterior bodies are in close contact with each other by pressurization, the exterior body 3 is divided and the cut edge of the laminated exterior body 3 generated by the division Causes the parts to fuse together.
- the portion 10C where the side seal portion is to be formed the portion that is irradiated with the laser light through the wide portion 52 has a relatively weak pressure as shown in FIG.
- the outer body 3 is divided by irradiating the continuous diaper 10 in a state where the body is not sufficiently adhered to the outer body 3, the cut edge of the laminated body 3 in the laminated state generated by the division. It becomes difficult to cause mutual fusion.
- FIG. 11 is a cross-sectional view (a cross-sectional view taken along the line IV-IV in FIG. 10) at a portion irradiated with laser light through the wide portion 52.
- a corresponding cross-sectional view (a cross-sectional view taken along the line III-III in FIG. 10) in a portion irradiated with laser light through the narrow portion 53 appears in the same manner as FIG. 7C and FIG.
- the sealing edge 41 similar to the sealing edge of the diaper 1 described above is formed by laser irradiation through the narrow portions 51 and 53.
- irradiation with laser light through the wide portion 52 forms an unsealed portion 42 in which the edge 3F of the exterior body in the front body F and the edge 3R of the exterior body in the back body R face each other in a non-bonded state. To do. For example, as shown in FIG.
- FIG. 11 shows a case where an adhesive is interposed between two sheets 31 and 32 of the outer layer sheet 31 and the inner layer sheet 32 that overlap each other in the vicinity of the portion 10C to be divided and in the vicinity thereof before irradiation with the laser beam 30.
- the adhesive is not joined between the two sheets 31 and 32, the two sheets on each of the front body side edge and the back body side edge of the non-seal part 42 are opposed to each other. The space is likely to become non-joined.
- the laser beam is irradiated through the light passage portion having the wide portion 52 and the narrow portions 51 and 53 having different widths, thereby being excellent in flexibility and touch.
- the seal edge portion 41 and the non-seal portion 42 that enhances the visibility of the side seal portion 4A can be efficiently manufactured.
- the ratio (W2 / W1) of the width W2 of the wide portion 52 and the width W1 of the narrow portions 51 and 53 can be set as appropriate so that the seal edge portion 41 and the non-seal portion 42 are formed. However, it is preferably 0.001 or more, more preferably 0.002 or more, preferably 0.8 or less, more preferably 0.6 or less, and preferably 0.001 to 0. .6, more preferably 0.002 to 0.6.
- the non-seal portion 42 it is preferable to blow air on the irradiated portion of the laser light in the diaper continuum (laminated outer package) during or after the laser light irradiation. . From the same viewpoint, it is also preferable to apply vibration to a diaper continuous body (laminated outer package) after irradiation with laser light.
- FIG. 12 is an explanatory diagram of the second embodiment of the manufacturing method of the present invention for manufacturing the diaper 50A of the first embodiment.
- the exterior body 3 side is located in the vicinity of the opening 27 (light passage portion) in the outer surface 21a with which the strip-shaped exterior body 3 contacts.
- the support member 21B provided with a high-order part 45a and a low-order part 45b having different protrusion heights 45h is used.
- the light passing portion through which the laser light can pass is composed of a slit-shaped opening 27 that penetrates the support member 21 in the thickness direction.
- the portion of the exterior body 3) that overlaps with the opening 27 does not generate pressure applied by being sandwiched between the support member 21 and the pressure belt 24 (pressing member). Since the portion 10 ⁇ / b> C is a portion in which the applied pressure is substantially affected, the fused portion 40 is formed. In order to form the fused portion 40 more stably, it is effective to further increase the pressure applied by the clamping between the members 21 and 24.
- a protruding portion 45 is formed on the outer surface 21a on the outer diaper continuous body 10 side (on the belt-shaped outer package 3 side and the pressure belt 24 side) with respect to the outer surface 21a. More specifically, the protrusion 45 is formed along each of a pair of opening edges extending in the longitudinal direction of each of the plurality of openings 27 (the width direction of the support member 21) on the outer surface 21 a of the support member 21. Each protrusion 45 is formed to extend in the longitudinal direction along the opening 27.
- Each protrusion 45 has a portion whose protrusion height 45h (projection height from the peripheral portion) is lower than other portions at a predetermined portion in the longitudinal direction, and that portion is a low portion 45b, and the other portions are high. It is part 45a.
- the low-order part 45b in each protrusion 45 has a protrusion height 45h lower than that of the high-order part 45a.
- the top of the protrusion 45 may be flat or a curved surface having a predetermined curvature, and the curved surface may be parallel to the outer surface 21 a of the cylindrical support member 21.
- a diaper continuum 10 is formed in the vicinity of the high portion 45a by forming a protruding portion 45 having a high portion 45a and a low portion 45b.
- the pressure applied to the vicinity of the part to be divided in the (strip-shaped exterior body) can be effectively increased, whereby the diaper continuous body 10 is surely fused (divided and fused), and the seal edge 41 described above is obtained. Can be reliably formed.
- the low-order part 45b it is possible to greatly reduce the pressing force in the vicinity of the part to be divided in the diaper continuous body 10 (strip-shaped exterior body) as compared with the vicinity of the high-order part 45a.
- the non-seal part 42 mentioned above can be formed reliably.
- the laser beam is irradiated to the site that is strongly pressed by the high level portion 45a and the site that is relatively weakly pressed by the low level portion 45b.
- flexibility and the touch, and the non-seal part 42 which improves the visibility of the side seal part 4A can be efficiently manufactured in the side seal part 4A in the diaper 50A.
- the protrusion height 45h (see FIG. 12) of the high portion 45a of the protrusion 45 is preferably 0. It is 1 mm or more, more preferably 1 mm or more, preferably 10 mm or less, more preferably 8 mm or less, preferably 0.1 mm or more and 10 mm or less, more preferably 1 mm or more and 8 mm or less.
- the lower portion 45b has a height difference from the higher portion 45a of preferably 0.1 mm or more, more preferably 0.2 mm or more, and more specifically preferably 0.1 mm or more and 20 mm or less, more preferably 0.
- the lower portion 45b of the protruding portion 45 may be a portion that does not protrude from the outer surface 21a of the support member 21 at all, instead of the one that protrudes from the outer surface 21a of the support member 21.
- FIG.14 and FIG.15 is a figure which shows other embodiment of the underpants type wearing article of this invention, and in the underpants type disposable diaper 50B of 2nd Embodiment shown in FIG. 14, the waist opening part of the side seal part 4B A non-seal part 42 having one end opened to the waist opening 8 side is formed at the end part on the 8 side.
- the pants-type disposable diaper 50C of the third embodiment shown in FIG. In the longitudinal direction, a plurality of non-seal parts 42 similar to the non-seal part 42 in the diaper of the first embodiment are intermittently formed.
- the side seal portions 4B and 4C are formed by forming the seal edge portion 41 similar to the seal edge portion 41 of the diaper 1, and thus the side seal portion. 4B and 4C are excellent in flexibility or touch, and the non-seal part 42 functions as a side seal part visibility improving means. Therefore, the side seal parts 4B and 4C are also excellent in visual visibility.
- the diaper 50B of the second embodiment is the same as the method of the first embodiment except that the position of the wide portion 52 is changed to the position where the non-seal portion 42 is formed in the manufacturing method of the first embodiment of the present invention described above.
- the position of the lower portion 45b is changed to a position where the non-seal portion 42 is formed. It can be produced in the same manner as the method.
- the seal edge is used while wearing the non-seal part 42 as a base point.
- the portion 41 There is a possibility that unintended peeling may occur in the portion 41. Therefore, in the vicinity of the non-seal portion 42 in the longitudinal direction of the seal edge 41, as shown in FIG. 14, in order to prevent unintentional peeling, the fusion strength at the seal edge 41 is partially improved. It is also preferable to form the tear prevention seal portion 43.
- the tear prevention seal portion 43 is used to prevent tearing when, for example, a slit edge (light passage portion) is irradiated with laser light linearly along the longitudinal direction to generate the seal edge portion 41.
- the laser beam intensity is increased only at the portion where the sealing portion 43 is to be formed, or the laser beam is additionally irradiated only at the portion where the tear prevention seal portion 43 is formed after the irradiation of the laser beam that generates the seal edge 41.
- the laser beam can be formed in advance by irradiating only the portion where the tear prevention seal portion 43 is formed before the laser beam irradiation for generating the seal edge portion 41.
- the diaper 50C of the third embodiment corresponds to the number of the wide portions 52 and the respective formation positions thereof in the manufacturing method of the first embodiment of the present invention described above, and the number of the non-seal portions 42 and the respective formation positions thereof.
- the number of the low-order parts 45b and their respective positions can be manufactured.
- each non-seal part 42 When a plurality of non-seal parts 42 are formed in each side seal part as in the diaper 50C of the third embodiment, the length of each non-seal part 42 is ensured from the viewpoint of securing the fusion strength necessary for the side seal part.
- the total length L2 is preferably 2% or more, more preferably 4% or more, and preferably 80% or less, more preferably, with respect to the total length L4 of the side seal portion (see FIG. 9A). 75% or less.
- the number of non-seal parts formed in each side seal part is preferably 2 or more, more preferably 3 or more, and preferably 80. Or less, more preferably 75 or less, and preferably 2 or more and 80 or less, more preferably 3 or more and 75 or less.
- the side seal part 4 (fusion part 40) becomes difficult to visually recognize from the outside in the wearing state or the natural state (contracted state) of the diaper 1, for example, after the use of the diaper 1, the protection from the infant who is the wearer When a person (for example, a mother) removes the diaper, it is difficult to find the side seal portion 4, and there is a possibility that it takes time to remove the diaper 1.
- the color of the constituent member of the diaper 1 that crosses the side seal portion 4 is set to the ventral side of the side seal portion 4. The method of making it differ by (front side) and back side (rear side) is mentioned.
- a sheet (outer layer sheet 31, inner layer sheet) that constitutes the waist elastic member 5 or the exterior body 3 with the abdomen side portion 1 ⁇ / b> A (front view time) and the back side portion 1 ⁇ / b> B (back view time) of the diaper 1. 32) and the like.
- the side seal portion 4 is positioned at the color switching portion, so that the visibility of the side seal portion 4 is further enhanced, and the occurrence of the inconvenience is further effectively prevented.
- the melting of the outer package using the heat source is not limited to the laser beam irradiation to the outer package, and as a non-contact heat source, infrared or halogen light may be used. It can also be carried out by thermocompression bonding of the exterior body using a known heat roll device or the like, or applying ultrasonic vibration to the exterior body using a known ultrasonic vibration device or the like.
- segmentation of an exterior body and formation of a junction part in the said side seal part formation process may be simultaneous, and may be divided after formation of a junction part.
- a strip-shaped outer package is a stack of four sheets as shown in FIG. 7 (a), or two, three, or five or more sheets. May be.
- the laser-type bonding apparatus 20 is provided with a mechanism for controlling the tension of the diaper continuous body 10. Also good.
- the exterior body 3 in the embodiment (mode) is not divided into the abdominal part 1A and the dorsal part 1B, but the abdominal part 1A, the crotch part 1C, and the dorsal part 1B.
- the exterior body in the present invention is not limited to such a continuous shape, and is, for example, the stomach side disposed on the wearer's stomach side (front side). It is divided
- seat member distribute
- the polymerization pressurizing step includes a front body side (a belt-like stomach side sheet member) of the belt-like exterior body to which the absorbent main body is fixed.
- a site where the side seal portion is to be formed in the belt-shaped exterior body having a configuration in which the back body side (band-shaped backside sheet member) is superimposed is brought into a pressurized state.
- Pants-type wearing articles such as pants-type disposable diapers with a split-type exterior body can also be divided into a crotch part and an abdominal side part and a back side part extending in front and rear thereof, and the abdominal sheet member is worn when worn It arrange
- seat member is distribute
- seat member are mutually joined in the right-and-left both sides of a pants type wearing article, and a pair of side seal part is formed.
- both side parts along the conveyance direction of each inner layer sheet 32 were folded back so as to cover both ends in the longitudinal direction of the absorbent main body 2, the width direction (longitudinal direction) of the band-shaped outer layer sheet 31 was more than the band-shaped inner layer sheet 32. Absorbs only the extension part of the outer layer sheet 31 that extends outward from the side edge of the inner layer sheet 32 when the sheets 31 and 32 are overlapped.
- the body 2 may be folded back so as to cover both ends in the longitudinal direction.
- the parting plan part 10C of the diaper continuous body 10 is a six-layer structure part in which the opening end part of the waist opening part 8 and its vicinity are overlapped with six sheets, and the other part is four sheets. Becomes a four-layer structure part.
- seat 32 do not need to be folded.
- pant-type wearing article in the present invention is not limited to a pant-type disposable diaper, and may be a pant-type sanitary napkin. It may be a diaper cover or the like that does not include
- the description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.
- An exterior body that forms the outer surface of the wearing article is provided, and a pair of side seal portions, a waist opening portion, and a pair of leg openings are formed by joining both side edges of the exterior body in the front body and both side edges of the exterior body in the back body
- a pants-type wearing article in which a part is formed The side seal portion includes a seal edge portion in which the edge portion of the exterior body in the front body and the edge portion of the exterior body in the back body are joined by a continuous linear fusion portion extending in the longitudinal direction of the side seal portion.
- a pants-type wearing article having a non-seal portion that is partly opposed to the edge of the exterior body in the front body and the edge of the exterior body in the back body in a non-bonded state.
- the exterior body includes an outer layer sheet that forms an outer surface of a worn article, an inner layer sheet that is disposed on the inner surface side of the outer layer sheet, and a plurality of thread-like or belt-like elastic members that are fixed between the two sheets with an adhesive.
- the underpants-type wearing article according to the above ⁇ 1> comprising: ⁇ 3> Between the outer layer sheet and the inner layer sheet, a waist elastic member that forms a waist gather, a waist elastic member that forms a waist gather, and a leg elastic member that forms a leg gather are stretched to a predetermined elongation rate.
- the underpants-type wearing article according to the above ⁇ 2> wherein a plurality of each are arranged in an extended state.
- the exterior body in the front body and the exterior body in the back body include a waist elastic member forming a waist gather or a waist elastic member forming a waist gather
- ⁇ 6> The pants-type wearing article according to any one of ⁇ 1> to ⁇ 5>, wherein the exterior body includes a nonwoven fabric, a film, or a laminate sheet of the nonwoven fabric and the film.
- a fusion portion between sheets constituting the exterior body is formed on the outer edge of the seal edge portion, and the fusion portion is in the thickness direction of the exterior body.
- the outer edge of the seal edge portion has a convex arc shape toward the inside of the wearing article, and includes the outer edge and is further inward of the wearing article.
- ⁇ 1> to ⁇ 6 wherein a fusion part between sheets constituting the exterior body is formed, and the fusion part is wider at the center in the thickness direction of the exterior body than both ends.
- ⁇ 9> The pants-type wear according to any one of ⁇ 1> to ⁇ 8>, wherein the wearer's skin is visible from the outside through a gap formed between both edges of the non-seal portion when worn. Goods.
- Each of the outer body in the front body and the outer body in the rear body has a structure in which an elastic member is disposed between two sheets, and is located on both sides of the non-seal portion.
- the pants-type wearing article according to any one of the above items ⁇ 1> to ⁇ 9>, wherein at least one elastic member is provided.
- the non-seal part is the pant mold according to any one of the above ⁇ 2> to ⁇ 10>, wherein a gap between edges of the non-seal part is greatly opened by contraction of an elastic member when a pant-type wearing article is worn Wearing articles.
- ⁇ 12> The pants-type wearing article according to any one of ⁇ 1> to ⁇ 11>, wherein a plurality of the non-seal portions are intermittently formed in a longitudinal direction of the side seal portion.
- ⁇ 13> The pants according to any one of the above items ⁇ 1> to ⁇ 12>, wherein the non-seal portion having one end opened to the waist opening side is formed at an end portion of the side seal portion on the waist opening side. Mold wearing article.
- ⁇ 14> The pants-type wear according to any one of the above items ⁇ 1> to ⁇ 13>, wherein a tear-preventing seal part having a partially improved fusion strength is formed in the vicinity of the non-seal part Goods.
- the pants-type wearing article has a crotch portion arranged in the crotch portion when worn, and a ventral side portion and a back side portion located in the longitudinal direction of the crotch portion,
- the pants-type wearing article can be divided into a crotch part arranged in the crotch part at the time of wearing, and a ventral part and a back part located in the longitudinal direction of the crotch part,
- the pants-type wearing article according to any one of the above items ⁇ 1> to ⁇ 16>, wherein the exterior body has an hourglass-like continuous shape extending over an abdominal side portion, a crotch portion, and a back side portion.
- the pants-type wearing article can be divided into a crotch part arranged in the crotch part at the time of wearing, and a ventral part and a back part located in the longitudinal direction of the crotch part,
- the exterior body is divided into an abdominal sheet member disposed on the abdominal side part and a back sheet member disposed on the back side part, and the absorbent main body is bridged and fixed to both the sheet members.
- the pants-type wearing article according to any one of ⁇ 1> to ⁇ 17>.
- ⁇ 20> The center part of the slit-shaped light passage part is scanned linearly from one end side to the other end side in the axial length direction of the cylindrical roll without changing the spot diameter and the laser output
- ⁇ 19> A method for producing a pants-type wearing article.
- ⁇ 21> The manufacturing method of the underpants type wearing article as described in said ⁇ 19> or ⁇ 20> using the supporting member provided with the said light passage part which has a wide part and a narrow part from which width
- a side seal part forming step of forming the side seal part by fusing the cut edges of the laminated outer package produced by the division In the side seal portion forming step, a support member provided with a high-order portion and a low-order portion different in height projecting toward the exterior body side in the vicinity of the light passing portion on the outer surface in contact with the exterior body, Forming the seal edge by irradiating a laser beam to a site strongly pressed by a high-order part, and forming the non
- a support member provided with a high-order part and a low-order part projecting to the exterior body side in the vicinity of the light passing part on the surface in contact with the belt-shaped exterior body is used. 22> The manufacturing method of the underpants type wearing article of description. ⁇ 24> The protruding height of the high-order part is preferably 0.1 mm or more, more preferably 1 mm or more, preferably 10 mm or less, more preferably 8 mm or less, and preferably 0.1 mm or more and 10 mm or less, More preferably, it is 1 mm or more and 8 mm or less, The manufacturing method of the underpants type wearing article as described in said ⁇ 22> or ⁇ 23>.
- the low-order part has a height difference from the high-order part of preferably 0.1 mm or more, more preferably 0.2 mm or more, and more specifically preferably 0.1 mm or more and 20 mm or less, more preferably 0.
- a waist gather is formed between the belt-like outer layer sheet constituting the outer package continuously supplied from the raw fabric roll and the belt-shaped inner layer sheet constituting the outer package continuously supplied from the raw roll.
- a plurality of waist elastic members, a waist elastic member forming a waist gather, and a leg elastic member forming a leg gather are each stretched at a predetermined stretch rate.
- the manufacturing method of the underpants type wearing article of any one of 25>. ⁇ 27> By feeding and pressing a belt-like outer layer sheet and a belt-like inner layer sheet sandwiching a waist elastic member, a waistline elastic member, and a leg elastic member in a stretched state between a pair of nip rolls, a plurality of pieces are provided between the belt-like sheets.
- the belt-like outer layer sheet and the belt-like inner layer sheet constituting the exterior body are hot-melted with an adhesive coating machine on a predetermined portion of one or both of the opposite surfaces of the two sheets before being overlapped.
- the waist part elastic member and the waistline part elastic member have a hot melt type by an adhesive coating machine before being arranged between the belt-like outer layer sheet constituting the outer package and the belt-like inner layer sheet constituting the outer package.
- ⁇ 31> Between the two sheets of the outer layer sheet constituting the outer package and the inner layer sheet constituting the outer package, which overlap each other in the vicinity of the part to be divided by the laser beam irradiation, before the laser beam irradiation, The method for producing a pants-type wearing article according to any one of the above items ⁇ 19> to ⁇ 30>, which is not joined.
- ⁇ 32> By folding the belt-shaped exterior body in the width direction, the front body side and the back body side of the belt-shaped exterior body to which the absorbent main body is fixed are overlapped, and the pants-type wear in which the side seal part is not formed
- ⁇ 33> The pants-type wearing article according to any one of ⁇ 19> to ⁇ 32>, wherein the side seal portion forming step forms a pair of side seal portions by irradiating a laser beam using a laser type bonding apparatus. Production method.
- the side seal portion is formed by irradiating a laser beam using a laser type bonding apparatus
- the laser-type bonding apparatus includes a hollow cylindrical roll that is driven to rotate, and an irradiation head that is disposed in a hollow portion of the cylindrical roll and irradiates laser light toward an annular support member that forms a peripheral surface portion of the cylindrical roll.
- a belt type pressure device provided with an endless pressure belt, and a tension adjusting mechanism capable of adjusting the tension of the pressure belt wound around the outer peripheral surface of the annular support member to adjust the tension.
- the method for producing a pants-type wearing article according to ⁇ 33> wherein the pressure applied to the continuous body of the pants-type wearing article can be adjusted by the support member and the pressure belt.
- the support member has a light passage part through which laser light can pass.
- ⁇ 36> The pant-type wearing article according to any one of the above items ⁇ 21> to ⁇ 35>, wherein the support member allows laser light to pass through the light passage portion, but does not allow laser light to pass through portions other than the light passage portion. Manufacturing method.
- the support member has a recess on its outer surface (contact surface with the workpiece), and a plurality of the recesses are formed at predetermined intervals in the circumferential direction of the cylindrical support member,
- Method. ⁇ 38> The method for manufacturing a pants-type wearing article according to any one of ⁇ 21> to ⁇ 37>, wherein the support member and the pressure belt are maintained in a predetermined temperature range by air cooling, water cooling, or the like.
- ⁇ 40> The method for producing a pant-type wearing article according to any one of the above items ⁇ 19> to ⁇ 39>, wherein vibration is applied to a continuous body of the pant-type wearing article after being irradiated with a laser beam (a laminated outer package).
- a laser beam a laminated outer package.
- the continuum of the pants-type wearing article is introduced onto the rotating support member so that one surface is in contact with the support member and the part to be divided (the part where the side seal part is to be formed) is located on the light passage part.
- the pressure belt pressing member
- the pressure belt is pressed against the other surface to be pressurized (compressed) in the thickness direction while being conveyed, according to any one of the above ⁇ 21> to ⁇ 40> A method for producing a pants-type wearing article.
- Laser beam is irradiated from the support member side through the light passing part to the part to be divided that is being transported and pressurized, and the irradiation point of the laser beam can be arbitrarily moved in the circumferential direction of the cylindrical roll By being configured to scan following the movement of the light passage portion along the circumferential direction, the part to be divided located on the light passage portion is being conveyed.
- the laser beam is irradiated once, and the strip-shaped exterior body is divided at the same time, and the fusion of the cut edges of the exterior body in two pressurized states generated by the division is performed.
- the outer layer sheet constituting the outer package and the cut edge portion of the inner layer sheet constituting the outer package are heated and melted during the irradiation of the laser beam and immediately after the irradiation, but by the irradiation of the laser beam Irradiation is completed while the pressed state of the support member and the pressure belt of each of the diaper precursor of a single sheet cut from the continuous body of the pant-type wearing article and the continuous body of the pant-type wearing article is maintained.
- the sheet constituting the exterior body is a synthetic resin nonwoven fabric or film,
- the sheet constituting the outer package includes polyethylene, polyethylene terephthalate, polypropylene, or the like as a synthetic resin
- an oscillation wavelength of 8.0 ⁇ m or more and 15.0 ⁇ m or less is used, ⁇ 19> to ⁇ 45 >
- ⁇ 47> The method for producing a pants-type wearing article according to any one of the above items ⁇ 19> to ⁇ 46>, wherein the laser light has a CO 2 laser oscillation wavelength of 9.0 ⁇ m to 11.0 ⁇ m.
- a tear prevention seal part with partially improved fusion strength is formed in the vicinity of the non-seal part
- the tear prevention seal portion is formed when the slit-shaped light passage portion is irradiated with laser light linearly along the longitudinal direction thereof to form the seal edge portion.
- the laser light intensity is increased only at the part to be formed, or the laser light is additionally applied only to the part at which the tear prevention seal part is formed after the laser light is generated to generate the seal edge part.
- any one of the above items ⁇ 19> to ⁇ 47> which is formed by, for example, irradiating only the portion where the tear prevention seal portion is to be formed with the laser beam in advance before the irradiation with the laser beam that generates the portion.
- the manufacturing method of the underpants type wearing article of description is formed by, for example, irradiating only the portion where the tear prevention seal portion is to be formed with the laser beam in advance before the irradiation with the laser beam that generates the portion.
- a pants-type wearing article having a side seal portion excellent in flexibility or touch and having high visibility by visual observation of the side seal portion.
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Abstract
Description
また、特許文献3には、非伸縮弾性バックシートにおける前身頃と後身頃の両側縁部どうしを接合してパンツ型使いすておむつとするに当たり、脚部弾性体部が接合せずにスリットを形成することが記載されている。
本発明の第1方法は、前身頃側と後身頃側とを重ねた状態の帯状の外装体におけるサイドシール部の形成予定部位を加圧状態にする重合加圧工程と、
加圧状態にある前記サイドシール部の形成予定部位に、前記外装体の搬送方向と交差する方向に延在する光通過部を介してレーザー光を照射することにより、該外装体を分断すると共に、その分断によって生じた積層状態の外装体の切断縁部どうしを融着させて前記サイドシール部を形成するサイドシール部形成工程とを具備する。
本発明の前記サイドシール部形成工程においては、相互に幅が異なる幅広部と幅狭部とを有する光通過部を介してレーザー光を照射し、前記幅狭部を介したレーザー光の照射により前記シール縁部を形成し、前記幅広部を介したレーザー光により前記非シール部を形成する。
本発明の第2方法は、前身頃側と後身頃側とを重ねた状態の帯状の外装体におけるサイドシール部の形成予定部位を加圧状態にする重合加圧工程と、
加圧状態にある前記サイドシール部の形成予定部位に、前記外装体の搬送方向と交差する方向に延在する光通過部を介してレーザー光を照射することにより、該外装体を分断すると共に、その分断によって生じた積層状態の外装体の切断縁部どうしを融着させて前記サイドシール部を形成するサイドシール部形成工程とを具備する。
第2方法の前記サイドシール部形成工程においては、外装体が接する外面における前記光通過部の近傍に、該外装体側に突出する高さが相互に異なる高位部と低位部とを設けた支持部材を用い、該高位部により強く加圧された部位に対するレーザー光の照射により前記シール縁部を形成し、前記低位部により相対的に弱く加圧された部位に対するレーザー光の照射により前記非シール部を形成する。
このサイドシール部視認性向上手段の採用は、パンツ型着用物品の製造工程において、前身頃側と後身頃側とを重ねた状態の帯状の外装体における所定箇所に、例えばレーザー光を照射する等して、前記外装体を個々の着用物品用の長さに分断するのと同時に、その分断によって生じた積層状態の外装体の切断縁部どうしを融着して、一対のサイドシール部を形成する場合に特に有用である。このような方法で形成されるサイドシール部は、着用物品の着用時(着用状態)において目視による視認性が低く、特に、着用物品を身体から取り外すために該サイドシール部を引き裂く観点から、着用時におけるサイドシール部の目視による視認性を向上させることは有用である。また、このようなサイドシール部は、着用物品の自然状態(収縮状態)においても目視による視認性が低いサイドシール部でもあるため、着用する際の着用物品の前後及び左右の見極めのためにも、着用物品の自然状態(着用前の収縮状態)におけるサイドシール部の目視による視認性を向上させることも有用である。
図1には、本発明の製造方法の一実施態様であるパンツ型使い捨ておむつの製造方法に適用可能な、レーザー式接合装置を用いたパンツ型使い捨ておむつの製造方法の概略が示されている。このレーザー式接合装置を用いた製造方法の製造目的物であるおむつ1は、図2~図4に示すように、吸収性本体2と、着用物品の外面を形成する外装体3とを備え、前身頃F(腹側部1A)における外装体3の縦方向Xに沿う左右両側縁部A1,A1と後身頃R(背側部1B)における外装体3の縦方向Xに沿う左右両側縁部B1,B1とが接合されて一対のサイドシール部4,4、ウエスト開口部8及び一対のレッグ開口部9,9が形成されているパンツ型使い捨ておむつである。外装体3は、吸収性本体2の非肌当接面側に位置して該吸収性本体2を固定している。また、おむつ1における一対のサイドシール部4,4は、それぞれ、前身頃Fにおける外装体3の縁部と後身頃Rにおける外装体3の縁部が、サイドシール部4の長手方向に延在する連続線状の融着部40で結合したシール縁部41を形成してなる。
この外装体3の形成工程においては、隣り合う2本の胴回り部弾性部材6,6間において帯状の外層シート31と帯状の内層シート32とを接合する複数の接合部(図示せず)を、凸ロールとこれに対応するアンビルロール等の接合手段(図示せず)を用いて形成することも好ましい。
その後、必要に応じて、弾性部材プレカット手段(図示せず)を用いて、後述する吸収性本体2を配する位置に対応させて、複数本の胴回り部弾性部材6及び複数本のレッグ部弾性部材7を押圧して、収縮機能が発現されないように個々複数個に分断する。前記弾性部材プレカット手段としては、例えば、特開2002-253605号公報に記載の複合伸縮部材の製造方法に用いる弾性部材分断部等が挙げられる。
レーザー式接合装置20は、環状の支持部材21の外周面(円筒ロール23の周面部)に巻き掛ける加圧ベルト24の張力を増減調整できる張力調整機構(図示せず)を備え、該張力の調整により、支持部材21と加圧ベルト24とによって、おむつ連続体10(シート積層体)に加える圧力を適宜調整することができる。
尚、図6(a)及び図6(b)では、説明容易の観点から、支持部材21及び加圧ベルト24(押さえ部材)並びにこれらに挟まれたおむつ連続体10(帯状の外装体)が、図6(a)及び図6(b)中、左側から右側に向かって水平移動しているかのように記載しているが、実際には、これら各部材は、円筒ロール23の円筒状の周面部に対応した湾曲状態で回転移動している。
シール縁部41は、図8(a)及び図8(b)に示すように、着用時におけるサイドシール部4が延びる方向と直交する断面において、融着部40からなる外縁4aが、着用物品の内方に向かって窪んだ形状を有している。また、シール縁部41における融着部40は、同断面において、おむつの外面に表れる幅W4が狭く、その幅W4は、好ましくは5mm以下、より好ましくは3mm以下であり、更に好ましくは2mm以下である。
前述した、レーザー式接合装置を用いた製造方法の製造目的物であるおむつ1、即ち、外装体3の分断と溶着とが同時に実施される工程を経て得られた一対のサイドシール部4,4を具備するおむつ1は、サイドシール部4の柔軟性、肌触りに優れ、着用感が良好である。その一方、図2及び図8の記載等からもわかるように、少なくとも着用時においてサイドシール部4が、おむつ1の外面及び内面の何れにおいても、該サイドシール部4の周辺部よりも外方に突出しておらず、おむつ1の外面及び内面の状態がサイドシール部4を跨いで実質的に変化しないので、サイドシール部4を外部から視認し難く、サイドシール部4の目視による視認性が低い。
第1実施形態のおむつ50Aにおける一対のサイドシール部4Aは、前述したおむつ1における一対のサイドシール部4と同様に、前身頃Fにおける外装体3の縁部3Fと後身頃Rにおける外装体3の縁部3Rが、サイドシール部4Aの長手方向に延在する連続線状の融着部40で結合したシール縁部41を有する。このシール縁部41の構造及び形成方法は、前述したおむつ1におけるシール縁部41と同じである。
第1実施形態のおむつ50Aが、前述したおむつ1と異なる点は、図9に示すように、サイドシール部4Aの一部に、前身頃Fにおける外装体3の縁部3Fと後身頃Rにおける外装体3の縁部3Rが、非結合状態で対向する非シール部42を有する点である。
本発明のパンツ型着用物品は、少なくとも着用状態の非シール部42において、前身頃F側の外装体3の縁部3Fと後身頃R側の外装体3の縁部3Rとが、着用者の胴回り方向において互いに対向している。非シール部42において前身頃F側の外装体3の縁部3Fと後身頃R側の外装体3の縁部3Rとは、互いに突き当たった状態となっていても良いが、少なくとも着用状態においては、両者間に隙間が生じることが好ましい。なお、おむつ50Aの非シール部42における前記縁部3F及び前記縁部3Rの切断端部では、外層シート31と内層シート32とが融着している。
サイドシール部4Aの視認性を高めるとともに、サイドシール部4Aに必要な融着強度を確保する観点から、非シール部42の長さL2は、シール縁部41の長さと非シール部42の長さとの合計であるサイドシール部4Aの全長L4に対して、好ましくは1%以上、より好ましくは2%以上であり、また、好ましくは40%以下、より好ましくは35%以下である。例えば、サイドシール部4Aの全長L4が100mmである幼児用のパンツ型着用物品においては、非シール部42の長さL2は、好ましくは2mm以上、より好ましくは4mm以上であり、また、好ましくは40mm以下、より好ましくは35mm以下である。
図11には、レーザー光30の照射前に、分断予定部分10C及びその近傍における、互いに重なり合う外層シート31及び内層シート32のそれぞれにおける2枚のシート31,32間に接着剤を介在させた場合を示したが、2枚のシート31,32間を接着剤を接合しない場合は、非シール部42における相対向する前身頃側の縁部及び後身頃側の縁部のそれぞれにおける2枚のシート間は相互に非接合となり易い。
なお、幅広部52の幅W2と幅狭部51,53の幅W1の比(W2/W1)は、シール縁部41と非シール部42とが形成されるように適宜に設定することができるが、例えば好ましくは0.001以上、より好ましくは0.002以上であり、また、好ましくは0.8以下であり、より好ましくは0.6以下であり、また、好ましくは0.001~0.6、より好ましくは0.002~0.6である。
低位部45bは、高位部45aとの高低差が、好ましくは0.1mm以上、更に好ましくは0.2mm以上であり、より具体的には、好ましくは0.1mm以上20mm以下、更に好ましくは0.2mm以上10mm以下である。
なお、突出部45における低位部45bは、支持部材21の外面21aから突出するものに代えて、支持部材21の外面21aから全く突出しない部分であっても良い。
この裂け防止用シール部43は、例えば、スリット状の開口部(光通過部)に、その長手方向に沿って直線状にレーザー光を照射してシール縁部41を生じさせる際に、裂け防止用シール部43を形成させる部分のみレーザー光の強度を強くしたり、シール縁部41を生じさせるレーザー光の照射後に、裂け防止用シール部43を形成させる部分のみにレーザー光を追加的に照射したり、シール縁部41を生じさせるレーザー光の照射前に、裂け防止用シール部43を形成させる部分のみにレーザー光を予め照射しておくこと等によって形成することができる。
第3実施形態のおむつ50Cのように、各サイドシール部に複数の非シール部42を形成する場合、サイドシール部に必要な融着強度を確保する観点から、個々の非シール部42の長さL2の総和が、サイドシール部の全長L4(図9(a)参照)に対して、好ましくは2%以上、より好ましくは4%以上であり、また、好ましくは80%以下、より好ましくは75%以下である。各サイドシール部に複数の非シール部42を形成する場合、各サイドシール部に形成する非シール部の個数は、好ましくは2個以上、より好ましくは3個以上であり、また、好ましくは80個以下、より好ましくは75個以下であり、また、2個以上80個以下が好ましく、3個以上75個以下が更に好ましい。
斯かる方法を採用すると、色の切り替え部分にサイドシール部4が位置するようになるため、サイドシール部4の目視による視認性が一層高まり、前記不都合の発生が一層効果的に防止される。
また、前記サイドシール部形成工程における外装体の分断及び接合部の形成は、同時でもよく、接合部の形成後に分断してもよい。
例えば、帯状の外装体(シート積層体)は、図7(a)に示す如き4枚のシートが重ねられたものの他、2枚、3枚又は5枚以上のシートが重ねられたものであっても良い。また、おむつ連続体10を円筒ロール23(支持部材21)に皴やたるみを発生させずに巻き掛けるために、レーザー式接合装置20に、おむつ連続体10のテンションを制御する機構を具備させても良い。
上述した一の実施形態における説明省略部分及び一の実施形態のみが有する要件は、それぞれ他の実施形態に適宜適用することができ、また、各実施形態における要件は、適宜、実施形態間で相互に置換可能である。
着用物品の外面を形成する外装体を備え、前身頃における外装体の両側縁部と後身頃における外装体の両側縁部とが接合されて一対のサイドシール部、ウエスト開口部及び一対のレッグ開口部が形成されているパンツ型着用物品であって、
前記サイドシール部は、前身頃における外装体の縁部と後身頃における外装体の縁部が、該サイドシール部の長手方向に延在する連続線状の融着部で結合したシール縁部を有すると共に、前身頃における外装体の縁部と後身頃における外装体の縁部が非結合状態で対向する非シール部を部分的に有している、パンツ型着用物品。
前記外装体は、着用物品の外面を形成する外層シートと、該外層シートの内面側に配された内層シートと、両シート間に接着剤により固定された複数本の糸状又は帯状の弾性部材とを含んで構成されている、前記<1>記載のパンツ型着用物品。
<3>
前記外層シートと、内層シートの間に、ウェストギャザーを形成するウエスト部弾性部材、胴回りギャザーを形成する胴回り部弾性部材及びレッグギャザーを形成するレッグ部弾性部材が、所定の伸長率に伸長させた伸長状態で各々複数本配されている前記<2>記載のパンツ型着用物品。
<4>
前身頃における外装体及び後身頃における外装体が、ウェストギャザーを形成するウエスト部弾性部材又は胴回りギャザーを形成する胴回り部弾性部材を含み、サイドシール部を挟む両側それぞれにおける外装体を構成するシート間に、前記ウエスト部弾性部材又は前記胴回り部弾性部材が接着剤を介して固定されている、前記<2>又は<3>に記載のパンツ型着用物品。
<5>
外装体は、樹脂材を含み、該樹脂材を主成分として形成されている、前記<1>~<4>の何れか1に記載のパンツ型着用物品。
<6>
前記外装体は、不織布、フィルム、又は、不織布とフィルムとのラミネートシートを有する、前記<1>~<5>の何れか1に記載のパンツ型着用物品。
<7>
前記サイドシール部が延びる方向と直交する断面において、前記シール縁部の外縁には、前記外装体を構成するシートどうしの融着部が形成され、該融着部は、該外装体の厚み方向の中央部が両端部に比して幅が広い、前記<1>~<6>の何れか1に記載のパンツ型着用物品。
<8>
前記サイドシール部が延びる方向と直交する断面において、前記シール縁部の外縁は、着用物品の内方に向かって凸の弧状をなし、且つ該外縁を含んでそれよりも着用物品の内方に、前記外装体を構成するシートどうしの融着部が形成され、該融着部は、該外装体の厚み方向の中央部が両端部に比して幅が広い、前記<1>~<6>の何れか1に記載のパンツ型着用物品。
<9>
着用時に、前記非シール部における両縁部間に生じる隙間を介して着用者の肌が外部から視認可能になされている、前記<1>~<8>の何れか1に記載のパンツ型着用物品。
前記前身頃における外装体及び前記後身頃における外装体は、それぞれ、2枚のシート間に弾性部材が配置された構造を有しており、前記非シール部を挟んで、その両側に位置する部位に、それぞれ少なくとも1本の前記弾性部材が配設されている、前記<1>~<9>の何れか1に記載のパンツ型着用物品。
<11>
前記非シール部は、パンツ型着用物品の着用時に、弾性部材の収縮により、該非シール部の縁部間の隙間が大きく開く、前記<2>~<10>の何れか1に記載のパンツ型着用物品。
<12>
前記非シール部は、前記サイドシール部の長手方向に、間欠的に複数形成されている、前記<1>~<11>の何れか1に記載のパンツ型着用物品。
<13>
前記サイドシール部のウエスト開口部側の端部に、一端がウエスト開口部側に開放された前記非シール部が形成されている、前記<1>~<12>の何れか1に記載のパンツ型着用物品。
<14>
前記非シール部の近傍に、シール縁部における、融着強度を部分的に向上させた裂け防止用シール部を形成する、前記<1>~<13>の何れか1に記載のパンツ型着用物品。<15>
パンツ型着用物品の構成部材の色を、前記サイドシール部よりも腹側と背側とで異ならせる、前記<1>~<14>の何れか1に記載のパンツ型着用物品。
<16>
前記パンツ型着用物品は、着用時に股下部に配される股下部並びにその縦方向の前後に位置する腹側部及び背側部を有し、
前記パンツ型着用物品の腹側部と背側部とで、ウエスト部弾性部材又は前記外装体を構成するシートの色を異ならせる、前記<1>~<15>の何れか1に記載のパンツ型着用物品。
<17>
前記パンツ型着用物品は、着用時に股下部に配される股下部並びにその縦方向の前後に位置する腹側部及び背側部に区分することができ、
前記外装体は、腹側部、股下部及び背側部に亘る砂時計状の連続した形状を有する、前記<1>~<16>の何れか1に記載のパンツ型着用物品。
<18>
前記パンツ型着用物品は、着用時に股下部に配される股下部並びにその縦方向の前後に位置する腹側部及び背側部に区分することができ、
前記外装体は、腹側部に配される腹側シート部材と、背側部に配される背側シート部材とに分割されており、吸収性本体がこれら両シート部材に架け渡して固定されている、前記<1>~<17>の何れか1に記載のパンツ型着用物品。
<19>
前記<1>~<18>の何れか1に記載のパンツ型着用物品の製造方法であって、
前身頃側と後身頃側とを重ねた状態の帯状の外装体におけるサイドシール部の形成予定部位を加圧状態にする重合加圧工程と、
加圧状態にある前記サイドシール部の形成予定部位に、前記外装体の搬送方向と交差する方向に延在する光通過部を介してレーザー光を照射することにより、該外装体を分断すると共に、その分断によって生じた積層状態の外装体の切断縁部どうしを融着させて前記サイドシール部を形成するサイドシール部形成工程とを具備し、
前記サイドシール部形成工程においては、相互に幅が異なる幅広部と幅狭部とを有する光通過部を介してレーザー光を照射し、前記幅狭部を介したレーザー光の照射により前記シール縁部を形成し、前記幅広部を介したレーザー光により前記非シール部を形成する、パンツ型着用物品の製造方法。
スリット状の前記光通過部の中央部を、円筒ロールの軸長方向の一端側から他端側に向かって、スポット径及びレーザー出力を変えずに直線状に走査させる、前記<19>記載のパンツ型着用物品の製造方法。
<21>
相互に幅が異なる幅広部と幅狭部とを有する前記光通過部を備えた支持部材を用いる、前記<19>又は<20>記載のパンツ型着用物品の製造方法。
<22>
前記<1>~<18>の何れか1に記載のパンツ型着用物品の製造方法であって、
前身頃側と後身頃側とを重ねた状態の帯状の外装体におけるサイドシール部の形成予定部位を加圧状態にする重合加圧工程と、
加圧状態にある前記サイドシール部の形成予定部位に、前記外装体の搬送方向と交差する方向に延在する光通過部を介してレーザー光を照射することにより、該外装体を分断すると共に、その分断によって生じた積層状態の外装体の切断縁部どうしを融着させて前記サイドシール部を形成するサイドシール部形成工程とを具備し、
前記サイドシール部形成工程においては、外装体が接する外面における前記光通過部の近傍に、該外装体側に突出する高さが相互に異なる高位部と低位部とを設けた支持部材を用い、該高位部により強く加圧された部位に対するレーザー光の照射により前記シール縁部を形成し、前記低位部により相対的に弱く加圧された部位に対するレーザー光の照射により前記非シール部を形成する、パンツ型着用物品の製造方法。
<23>
前記支持部材として、帯状の前記外装体が接する面における前記光通過部の近傍に、該外装体側に突出する高さが相互に異なる高位部と低位部とを設けた支持部材を用いる、前記<22>記載のパンツ型着用物品の製造方法。
<24>
前記高位部の突出高さは、好ましくは0.1mm以上、更に好ましくは1mm以上であり、また、好ましくは10mm以下、更に好ましくは8mm以下であり、また、好ましくは0.1mm以上10mm以下、更に好ましくは1mm以上8mm以下である、前記<22>又は<23>に記載のパンツ型着用物品の製造方法。
<25>
前記低位部は、前記高位部との高低差が、好ましくは0.1mm以上、更に好ましくは0.2mm以上であり、より具体的には、好ましくは0.1mm以上20mm以下、更に好ましくは0.2mm以上10mm以下である、前記<22>~<24>の何れか1に記載のパンツ型着用物品の製造方法。
<26>
原反ロールから連続的に供給される前記外装体を構成する帯状の外層シートと、原反ロールから連続的に供給される該外装体を構成する帯状の内層シートの間に、ウェストギャザーを形成するウエスト部弾性部材、胴回りギャザーを形成する胴回り部弾性部材及びレッグギャザーを形成するレッグ部弾性部材を、所定の伸長率に伸長させた伸長状態で各々複数本配する、前記<19>~<25>の何れか1に記載のパンツ型着用物品の製造方法。
<27>
一対のニップロールの間に、ウエスト部弾性部材、胴回り部弾性部材及びレッグ部弾性部材を伸長状態で挟み込んだ帯状の外層シート及び帯状の内層シートを送り込んで加圧することにより、該帯状シート間に複数本の弾性部材が伸長状態で配された帯状の前記外装体を形成する、前記<19>~<26>の何れか1に記載のパンツ型着用物品の製造方法。
<28>
前記外装体を構成する帯状の外層シート及び帯状の内層シートには、それらを重ね合わせる前に、両シートの何れか一方又は双方の対向する面の所定部位に、接着剤塗工機によりホットメルト型接着剤を塗工する、前記<19>~<27>の何れか1に記載のパンツ型着用物品の製造方法。
<29>
ウエスト部弾性部材、胴回り部弾性部材等の弾性部材が、前記外装体を構成する帯状の外層シート及び該外装体を構成する帯状の内層シートにおける、レーザー光の照射によって分断される分断予定部分を跨ぐように伸長状態で配されている場合、該分断予定部分及びその近傍に接着剤を塗工しておく、前記<19>~<28>の何れか1に記載のパンツ型着用物品の製造方法。
ウエスト部弾性部材及び胴回り部弾性部材には、前記外装体を構成する帯状の外層シート及び該外装体を構成する帯状の内層シート間に配される前に、接着剤塗工機によりホットメルト型接着剤を間欠的に塗工する、前記<19>~<29>の何れか1に記載のパンツ型着用物品の製造方法。
<31>
レーザー光の照射によって分断される分断予定部分及びその近傍における互いに重なり合う前記外装体を構成する外層シート及び該外装体を構成する内層シートの2枚のシート間は、レーザー光の照射前において、全く接合されていない、前記<19>~<30>の何れか1に記載のパンツ型着用物品の製造方法。
<32>
帯状の前記外装体をその幅方向に折り畳むことにより、吸収性本体が固定された帯状の該外装体の前身頃側と後身頃側とを重ね合わせ、サイドシール部が形成されていないパンツ型着用物品の前駆体が一方向に連なってなる、パンツ型着用物品の連続体を製造する、前記<19>~<31>の何れか1に記載のパンツ型着用物品の製造方法。
<33>
前記サイドシール部形成工程は、レーザー式接合装置を用いてレーザー光を照射して一対のサイドシール部を形成する、前記<19>~<32>の何れか1に記載のパンツ型着用物品の製造方法。
<34>
前記サイドシール部形成工程は、レーザー式接合装置を用いてレーザー光を照射して前記サイドシール部を形成し、
前記レーザー式接合装置は、回転駆動される中空の円筒ロールと、該円筒ロールの中空部に配され、該円筒ロールの周面部を形成する環状の支持部材に向けてレーザー光を照射する照射ヘッドと、無端状の加圧ベルトを備えたベルト式加圧装置と、環状の該支持部材の外周面に巻き掛ける該加圧ベルトの張力を増減調整できる張力調整機構とを備え、該張力の調整により、該支持部材と該加圧ベルトとによって、パンツ型着用物品の連続体に加える圧力を調整することができる、前記<33>記載のパンツ型着用物品の製造方法。
<35>
前記支持部材は、レーザー光が通過可能な光通過部を有しており、
前記光通過部として、前記支持部材を厚み方向に貫通するスリット状の開口部を有している、前記<21>~<34>の何れか1に記載のパンツ型着用物品の製造方法。
<36>
前記支持部材は、前記光通過部ではレーザー光を通過させる一方、前記光通過部以外の部分ではレーザー光を通過させない、前記<21>~<35>の何れか1に記載のパンツ型着用物品の製造方法。
<37>
前記支持部材は、その外面(被加工物との当接面)に凹部を有しており、該凹部は、円筒状の該支持部材の周方向に所定間隔を置いて複数形成されており、隣接する2つの凹部間に位置する領域(凸部)に、スリット状の前記光通過部が形成されている、前記<21>~<36>の何れか1に記載のパンツ型着用物品の製造方法。
<38>
前記支持部材及び加圧ベルトは、空冷、水冷等により温度を所定の温度範囲に維持する、前記<21>~<37>の何れか1に記載のパンツ型着用物品の製造方法。
<39>
レーザー光の照射中又は照射後に、パンツ型着用物品の連続体(積層状態の外装体)における、レーザー光の被照射部位に対してエアーを吹き付ける、前記<19>~<38>の何れか1に記載のパンツ型着用物品の製造方法。
レーザー光の照射後のパンツ型着用物品の連続体(積層状態の外装体)に対して振動を与える、前記<19>~<39>の何れか1に記載のパンツ型着用物品の製造方法。
<41>
パンツ型着用物品の連続体は、一方の面が支持部材に当接し且つ分断予定部分(サイドシール部の形成予定部位)が前記光通過部上に位置するように、回転する支持部材上に導入されると共に、他方の面に加圧ベルト(押さえ部材)が押し付けられることによって、搬送されつつ厚み方向に加圧(圧縮)される、前記<21>~<40>の何れか1に記載のパンツ型着用物品の製造方法。
<42>
搬送中且つ加圧状態の分断予定部分に対して、支持部材側から前記光通過部を介してレーザー光を照射され、該レーザー光の照射点は、円筒ロールの周方向に任意に移動可能に構成されており、該光通過部の該周方向に沿った移動に追従して走査するように設定されていることにより、該光通過部上に位置する該分断予定部分には、その搬送中に該レーザー光が一定時間連続的に照射される、前記<21>~<41>の何れか1に記載のパンツ型着用物品の製造方法。
<43>
一回のレーザー光の照射で、帯状の前記外装体の分断と、その分断によって生じた2箇所の加圧状態にある該外装体の切断縁部どうしの融着とを同時に実施する、前記<19>~<42>の何れか1に記載のパンツ型着用物品の製造方法。
<44>
前記外装体を構成する外層シート及び該外装体を構成する内層シートの切断縁部は、レーザー光の照射中及び照射終了直後は、発熱して溶融状態となっているが、レーザー光の照射によってパンツ型着用物品の連続体から切り分けられた1つの枚葉のおむつ前駆体及び該パンツ型着用物品の連続体それぞれの、支持部材と加圧ベルトとによる加圧状態が保持されたまま、照射終了後からは外気や支持部材・加圧ベルトへの伝熱によって速やかに冷却されて固化し、該切断縁部の形成材料が溶融一体化した融着部となる、前記<21>~<43>の何れか1に記載のパンツ型着用物品の製造方法。
<45>
前記外装体を構成するシートが、合成樹脂製の不織布やフィルムであり、
レーザー光として、CO2レーザー、YAGレーザー、LDレーザー(半導体レーザー)、YVO4レーザー、ファイバーレーザー等を用いる、前記<19>~<44>の何れか1に記載のパンツ型着用物品の製造方法。
<46>
レーザー光としては、前記外装体を構成するシートが、合成樹脂として、ポリエチレン、ポリエチレンテレフタレート、ポリプロピレン等を含む場合、発振波長が8.0μm以上15.0μm以下を用いる、前記<19>~<45>の何れか1に記載のパンツ型着用物品の製造方法。
<47>
レーザー光としては、CO2レーザーの発振波長の9.0μm以上11.0μm以下を用いる、前記<19>~<46>の何れか1に記載のパンツ型着用物品の製造方法。
<48>
ウエスト開口部側の端に、一端側が開放された非シール部を形成する場合、非シール部の近傍に、シール縁部における、融着強度を部分的に向上させた裂け防止用シール部を形成し、
前記裂け防止用シール部は、スリット状の前記光通過部に、その長手方向に沿って直線状にレーザー光を照射して該シール縁部を生じさせる際に、該裂け防止用シール部を形成させる部分のみレーザー光の強度を強くしたり、該シール縁部を生じさせるレーザー光の照射後に、該裂け防止用シール部を形成させる部分のみにレーザー光を追加的に照射したり、該シール縁部を生じさせるレーザー光の照射前に、該裂け防止用シール部を形成させる部分のみにレーザー光を予め照射しておくこと等によって形成する、前記<19>~<47>の何れか1に記載のパンツ型着用物品の製造方法。
1A 腹側部
1B 背側部
F 前身頃
R 後身頃
2 吸収性本体
3 外装体
31 外層シート
32 内層シート
3F 前身頃における外装体の縁部
3R 後身頃における外装体の縁部
4,4A~4C サイドシール部
40 融着部
40a 融着部の外縁
41 シール縁部
42 非シール部
10 おむつ連続体(帯状の外装体)
20 レーザー式接合装置
21,21A,21B 支持部材
26 ベルト式加圧装置
27,27A 開口部(光通過部)
52 幅広部
53 幅狭部
30 レーザー光
45 突出部
45a 高位部
45b 低位部
Claims (27)
- 着用物品の外面を形成する外装体を備え、前身頃における外装体の両側縁部と後身頃における外装体の両側縁部とが接合されて一対のサイドシール部、ウエスト開口部及び一対のレッグ開口部が形成されているパンツ型着用物品であって、
前記サイドシール部は、前身頃における外装体の縁部と後身頃における外装体の縁部が、該サイドシール部の長手方向に延在する連続線状の融着部で結合したシール縁部を有すると共に、前身頃における外装体の縁部と後身頃における外装体の縁部が非結合状態で対向する非シール部を部分的に有している、パンツ型着用物品。 - 前記外装体は、着用物品の外面を形成する外層シートと、該外層シートの内面側に配された内層シートと、両シート間に接着剤により固定された複数本の糸状又は帯状の弾性部材とを含んで構成されている、請求項1に記載のパンツ型着用物品。
- 前身頃における外装体及び後身頃における外装体が、ウェストギャザーを形成するウエスト部弾性部材又は胴回りギャザーを形成する胴回り部弾性部材を含み、サイドシール部を挟む両側それぞれにおける外装体を構成するシート間に、前記ウエスト部弾性部材又は前記胴回り部弾性部材が接着剤を介して固定されている、請求項1又は2に記載のパンツ型着用物品。
- 前記サイドシール部が延びる方向と直交する断面において、前記シール縁部の外縁には、前記外装体を構成するシートどうしの融着部が形成され、該融着部は、該外装体の厚み方向の中央部が両端部に比して幅が広い、請求項1~3の何れか1項に記載のパンツ型着用物品。
- 前記サイドシール部が延びる方向と直交する断面において、前記シール縁部の外縁は、着用物品の内方に向かって凸の弧状をなし、且つ該外縁を含んでそれよりも着用物品の内方に、前記外装体を構成するシートどうしの融着部が形成され、該融着部は、該外装体の厚み方向の中央部が両端部に比して幅が広い、請求項1~4の何れか1項に記載のパンツ型着用物品。
- 着用時に、前記非シール部における両縁部間に生じる隙間を介して着用者の肌が外部から視認可能になされている、請求項1~5の何れか1項に記載のパンツ型着用物品。
- 前記前身頃における外装体及び前記後身頃における外装体は、それぞれ、2枚のシート間に弾性部材が配置された構造を有しており、前記非シール部を挟んで、その両側に位置する部位に、それぞれ少なくとも1本の前記弾性部材が配設されている、請求項1~6の何れか1項に記載のパンツ型着用物品。
- 前記非シール部は、パンツ型着用物品の着用時に、弾性部材の収縮により、該非シール部の縁部間の隙間が大きく開く、請求項2~7の何れか1項に記載のパンツ型着用物品。
- 前記非シール部は、前記サイドシール部の長手方向に、間欠的に複数形成されている、請求項1~8の何れか1項に記載のパンツ型着用物品。
- 前記サイドシール部のウエスト開口部側の端部に、一端がウエスト開口部側に開放された前記非シール部が形成されている、請求項1~9の何れか1項に記載のパンツ型着用物品。
- 前記非シール部の近傍に、シール縁部における、融着強度を部分的に向上させた裂け防止用シール部を形成する、請求項1~10の何れか1項に記載のパンツ型着用物品。
- パンツ型着用物品の構成部材の色を、前記サイドシール部よりも腹側と背側とで異ならせる、請求項1~11の何れか1項に記載のパンツ型着用物品。
- 前記パンツ型着用物品は、着用時に股下部に配される股下部並びにその縦方向の前後に位置する腹側部及び背側部を有し、
前記パンツ型着用物品の腹側部と背側部とで、ウエスト部弾性部材又は前記外装体を構成するシートの色を異ならせる、請求項1~12の何れか1項に記載のパンツ型着用物品。 - 前記パンツ型着用物品は、着用時に股下部に配される股下部並びにその縦方向の前後に位置する腹側部及び背側部に区分することができ、
前記外装体は、腹側部、股下部及び背側部に亘る砂時計状の連続した形状を有する、請求項1~13の何れか1項に記載のパンツ型着用物品。 - 前記パンツ型着用物品は、着用時に股下部に配される股下部並びにその縦方向の前後に位置する腹側部及び背側部に区分することができ、
前記外装体は、腹側部に配される腹側シート部材と、背側部に配される背側シート部材とに分割されており、吸収性本体がこれら両シート部材に架け渡して固定されている、請求項1~14の何れか1項に記載のパンツ型着用物品。 - 請求項1~15の何れか1項に記載のパンツ型着用物品の製造方法であって、
前身頃側と後身頃側とを重ねた状態の帯状の外装体におけるサイドシール部の形成予定部位を加圧状態にする重合加圧工程と、
加圧状態にある前記サイドシール部の形成予定部位に、前記外装体の搬送方向と交差する方向に延在する光通過部を介してレーザー光を照射することにより、該外装体を分断すると共に、その分断によって生じた積層状態の外装体の切断縁部どうしを融着させて前記サイドシール部を形成するサイドシール部形成工程とを具備し、
前記サイドシール部形成工程においては、相互に幅が異なる幅広部と幅狭部とを有する光通過部を介してレーザー光を照射し、前記幅狭部を介したレーザー光の照射により前記シール縁部を形成し、前記幅広部を介したレーザー光により前記非シール部を形成する、パンツ型着用物品の製造方法。 - スリット状の前記光通過部の中央部を、円筒ロールの軸長方向の一端側から他端側に向かって、スポット径及びレーザー出力を変えずに直線状に走査させる、請求項16に記載のパンツ型着用物品の製造方法。
- 相互に幅が異なる幅広部と幅狭部とを有する前記光通過部を備えた支持部材を用いる、請求項16又は17に記載のパンツ型着用物品の製造方法。
- 請求項1~15の何れか1項に記載のパンツ型着用物品の製造方法であって、
前身頃側と後身頃側とを重ねた状態の帯状の外装体におけるサイドシール部の形成予定部位を加圧状態にする重合加圧工程と、
加圧状態にある前記サイドシール部の形成予定部位に、前記外装体の搬送方向と交差する方向に延在する光通過部を介してレーザー光を照射することにより、該外装体を分断すると共に、その分断によって生じた積層状態の外装体の切断縁部どうしを融着させて前記サイドシール部を形成するサイドシール部形成工程とを具備し、
前記サイドシール部形成工程においては、外装体が接する外面における前記光通過部の近傍に、該外装体側に突出する高さが相互に異なる高位部と低位部とを設けた支持部材を用い、該高位部により強く加圧された部位に対するレーザー光の照射により前記シール縁部を形成し、前記低位部により相対的に弱く加圧された部位に対するレーザー光の照射により前記非シール部を形成する、パンツ型着用物品の製造方法。 - レーザー光の照射によって分断される分断予定部分及びその近傍における互いに重なり合う前記外装体を構成する外層シート及び該外装体を構成する内層シートの2枚のシート間は、レーザー光の照射前において、全く接合されていない、請求項16~19の何れか1項に記載のパンツ型着用物品の製造方法。
- 帯状の前記外装体をその幅方向に折り畳むことにより、吸収性本体が固定された帯状の該外装体の前身頃側と後身頃側とを重ね合わせ、サイドシール部が形成されていないパンツ型着用物品の前駆体が一方向に連なってなる、パンツ型着用物品の連続体を製造する、請求項16~20の何れか1項に記載のパンツ型着用物品の製造方法。
- 前記サイドシール部形成工程は、レーザー式接合装置を用いてレーザー光を照射して前記サイドシール部を形成し、
前記レーザー式接合装置は、回転駆動される中空の円筒ロールと、該円筒ロールの中空部に配され、該円筒ロールの周面部を形成する環状の支持部材に向けてレーザー光を照射する照射ヘッドと、無端状の加圧ベルトを備えたベルト式加圧装置と、環状の該支持部材の外周面に巻き掛ける該加圧ベルトの張力を増減調整できる張力調整機構とを備え、該張力の調整により、該支持部材と該加圧ベルトとによって、パンツ型着用物品の連続体に加える圧力を調整することができる、請求項21に記載のパンツ型着用物品の製造方法。 - 前記支持部材は、レーザー光が通過可能な光通過部を有しており、
前記光通過部として、前記支持部材を厚み方向に貫通するスリット状の開口部を有している、請求項18~22の何れか1項に記載のパンツ型着用物品の製造方法。 - 前記支持部材は、前記光通過部ではレーザー光を通過させる一方、前記光通過部以外の部分ではレーザー光を通過させない、請求項18~23の何れか1項に記載のパンツ型着用物品の製造方法。
- 一回のレーザー光の照射で、帯状の前記外装体の分断と、その分断によって生じた2箇所の加圧状態にある該外装体の切断縁部どうしの融着とを同時に実施する、請求項16~24の何れか1項に記載のパンツ型着用物品の製造方法。
- 前記外装体を構成する外層シート及び該外装体を構成する内層シートの切断縁部は、レーザー光の照射中及び照射終了直後は、発熱して溶融状態となっているが、レーザー光の照射によってパンツ型着用物品の連続体から切り分けられた1つの枚葉のおむつ前駆体及び該パンツ型着用物品の連続体それぞれの、支持部材と加圧ベルトとによる加圧状態が保持されたまま、照射終了後からは外気や支持部材・加圧ベルトへの伝熱によって速やかに冷却されて固化し、該切断縁部の形成材料が溶融一体化した融着部となる、請求項18~25の何れか1項に記載のパンツ型着用物品の製造方法。
- ウエスト開口部側の端に、一端側が開放された非シール部を形成する場合、非シール部の近傍に、シール縁部における、融着強度を部分的に向上させた裂け防止用シール部を形成し、
前記裂け防止用シール部は、スリット状の前記光通過部に、その長手方向に沿って直線状にレーザー光を照射して該シール縁部を生じさせる際に、該裂け防止用シール部を形成させる部分のみレーザー光の強度を強くしたり、該シール縁部を生じさせるレーザー光の照射後に、該裂け防止用シール部を形成させる部分のみにレーザー光を追加的に照射したり、該シール縁部を生じさせるレーザー光の照射前に、該裂け防止用シール部を形成させる部分のみにレーザー光を予め照射しておくこと等によって形成する、請求項16~26の何れか1項に記載のパンツ型着用物品の製造方法。
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Also Published As
Publication number | Publication date |
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EP3015096A4 (en) | 2017-02-22 |
RU2016102407A3 (ja) | 2018-04-04 |
KR20160027002A (ko) | 2016-03-09 |
CN105263454B (zh) | 2019-06-18 |
RU2016102407A (ru) | 2017-08-03 |
BR112015030842A2 (ja) | 2020-05-05 |
TW201507708A (zh) | 2015-03-01 |
JP6161029B2 (ja) | 2017-07-12 |
EP3015096A1 (en) | 2016-05-04 |
JP2015008943A (ja) | 2015-01-19 |
CN105263454A (zh) | 2016-01-20 |
RU2658584C2 (ru) | 2018-06-21 |
EP3015096B1 (en) | 2018-07-25 |
US20160120709A1 (en) | 2016-05-05 |
US10709617B2 (en) | 2020-07-14 |
TWI617298B (zh) | 2018-03-11 |
KR102268201B1 (ko) | 2021-06-22 |
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