WO2014200104A1 - 超音波溶着装置及びこれを用いた使い捨ておむつの製造方法 - Google Patents
超音波溶着装置及びこれを用いた使い捨ておむつの製造方法 Download PDFInfo
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- WO2014200104A1 WO2014200104A1 PCT/JP2014/065808 JP2014065808W WO2014200104A1 WO 2014200104 A1 WO2014200104 A1 WO 2014200104A1 JP 2014065808 W JP2014065808 W JP 2014065808W WO 2014200104 A1 WO2014200104 A1 WO 2014200104A1
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- WIPO (PCT)
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- welding
- moving
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- ultrasonic
- tool
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- 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
- A61F13/15699—Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- 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
- A61F13/15585—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers
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- A—HUMAN NECESSITIES
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- A61F13/00—Bandages or dressings; Absorbent pads
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- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15707—Mechanical treatment, e.g. notching, twisting, compressing, shaping
- A61F13/15739—Sealing, e.g. involving cutting
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- A—HUMAN NECESSITIES
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- A61F13/00—Bandages or dressings; Absorbent pads
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- B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
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- B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
- B29C65/7858—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined
- B29C65/7888—Means for handling of moving sheets or webs
- B29C65/7894—Means for handling of moving sheets or webs of continuously moving sheets or webs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- 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
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- B29C66/032—Mechanical after-treatments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/01—General aspects dealing with the joint area or with the area to be joined
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- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
- B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
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- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/7234—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 structure of the material of the parts to be joined being multi-layered comprising a barrier layer
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- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
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- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
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- B29C66/90—Measuring or controlling the joining process
- B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
- B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
- B29C66/9261—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools
- B29C66/92611—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by controlling or regulating the gap between the joining tools
- B29C66/92615—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by controlling or regulating the gap between the joining tools the gap being non-constant over time
-
- 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
- B29C66/90—Measuring or controlling the joining process
- B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
- B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
- B29C66/9261—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools
- B29C66/92651—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by using stops
- B29C66/92653—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by using stops said stops being adjustable
-
- 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
- B29C66/90—Measuring or controlling the joining process
- B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
- B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
- B29C66/9261—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools
- B29C66/92651—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by using stops
- B29C66/92655—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by using stops by using several stops
-
- 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
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/433—Casing-in, i.e. enclosing an element between two sheets by an outlined seam
-
- 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
- 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
- B29C66/72—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 structure of the material of the parts to be joined
- B29C66/729—Textile or other fibrous material made from plastics
- B29C66/7294—Non woven mats, e.g. felt
-
- 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
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
- B29C66/822—Transmission mechanisms
- B29C66/8226—Cam mechanisms; Wedges; Eccentric mechanisms
- B29C66/82263—Follower pin or roller cooperating with a groove
-
- 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
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
- B29C66/824—Actuating mechanisms
- B29C66/8242—Pneumatic or hydraulic drives
-
- 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 an ultrasonic welding apparatus for ultrasonic welding of an object to be welded and a method for manufacturing a disposable diaper using the same.
- an anvil and an ultrasonic horn are provided, and an ultrasonic vibration is applied to the ultrasonic horn in a state where the weld is sandwiched between the anvil and the ultrasonic horn.
- a sonic welding apparatus is known.
- a welding member is welded between a holding member that holds the welding object and an ultrasonic horn at a position overlapping the welding object held by the holding member in plan view.
- an anvil roller that is movable with respect to a holding member between a welding range to be performed and a non-welding range that crosses the object to be welded (for example, Patent Document 1).
- the ultrasonic welding apparatus described in Patent Document 1 drives the anvil roller with respect to the ultrasonic horn so that the anvil roller approaches the ultrasonic horn in the welding range and the anvil roller moves away from the ultrasonic horn in the non-welding range.
- FIG. 14 is a side view showing a schematic configuration of the drive mechanism of the ultrasonic welding apparatus described in Patent Document 1.
- the drive mechanism described in Patent Document 1 is attached to a horn holding member 103 that holds an ultrasonic horn 100, and is rotatably attached to the horn holding member 103 around a rotation shaft 104a and around a rotation shaft 101a.
- An anvil holding member 104 that holds the anvil roller 101 so as to be rotatable, and a cylinder 105 that rotates the anvil holding member 104 with respect to the horn holding member 103 are provided.
- the cylinder 105 is reduced so that the anvil roller 101 moves away from the ultrasonic horn 100 in a state where the anvil roller 101 moves to the non-welding range that crosses the workpiece 106.
- the cylinder 105 extends so that the anvil roller 101 approaches the ultrasonic horn 100 in the welding range in which the workpiece 106 is welded as shown in FIG.
- the drive mechanism described in Patent Document 1 moves the anvil roller 101 closer to or away from the ultrasonic horn 100 by expansion and contraction of the cylinder 105. Therefore, the cylinder 105 and a configuration for supplying power to the cylinder 105 are necessary, and the ultrasonic welding apparatus is increased in size. Further, in order to move the anvil roller 101 closer to or away from the ultrasonic horn 100 in accordance with the movement between the welding range and the non-welding range, complicated drive control of the cylinder 105 is required.
- An object of the present invention is to provide an ultrasonic welding apparatus capable of simplifying the configuration and control for bringing an ultrasonic horn and an anvil closer to or away from each other and a method for manufacturing a disposable diaper using the ultrasonic welding apparatus.
- the present invention is an ultrasonic welding apparatus for ultrasonically welding a material to be welded, a holding member for holding the material to be welded, and applying ultrasonic vibration to the material to be welded.
- a pair of welding tools each having an ultrasonic horn having an output surface, and an anvil having a welding surface for welding the welded material between the output surfaces of the ultrasonic horn, of the pair of welding tools
- the moving-side welding tool which is one of the above, is a counterpart of the other of the pair of welding tools, in which the output surface or the welding surface of the moving-side welding tool overlaps the object to be welded held by the holding member in plan view.
- a pair of welding tools that are movable with respect to the holding member over a welding range in which the object to be welded is welded to a side welding tool and a non-welding range that is out of the welding range in plan view;
- the output surface and the welding surface A displacement mechanism for displacing the moving welding tool relative to the mating welding tool so that the output surface and the welding surface move away from each other in the non-welding range, and the mating welding tool includes:
- the output surface or the end including the welding surface is branched in a direction perpendicular to the moving direction by a slit extending in the moving direction of the moving-side welding tool, and is positioned on both sides of the slit.
- the displacement mechanism has a pair of end surfaces that function as the welding surfaces, and the displacement mechanism directs the moving welding tool toward the mating welding tool so that the output surface and the welding surface approach the normal line direction.
- this invention uses the said ultrasonic welding apparatus, between the front abdominal part arrange
- a disposable diaper having a crotch portion extending through the crotch portion through the crotch portion and having a longitudinally connected component through the crotch portion.
- a preparation process for preparing a continuous body that is continuous in a direction, a two-fold process for folding the continuous body in half in a vertical direction, and the moving-side welding tool is moved over the welding range and the non-welding range.
- a method for manufacturing a disposable diaper comprising: a welding step of simultaneously welding two portions of an overlapping portion with a corresponding portion; and a cutting step of cutting the continuous body between two welding portions formed in the welding step.
- the configuration and control for bringing the ultrasonic horn and the anvil closer to or away from each other can be simplified.
- FIG. 2 is a front view showing a schematic configuration of the ultrasonic welding apparatus according to the first embodiment of the present invention for performing the welding process shown in FIG. 1.
- 3 is a cross-sectional view taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG.
- FIG. 5 is a view of the sheet holding drum of FIG. 3 as viewed from the outside.
- FIG. 6 is an enlarged side view showing a part of FIG. 7 is a cross-sectional view taken along line VII-VII in FIG.
- FIG. 8 is a view corresponding to FIG. 6 of an ultrasonic welding apparatus according to the second embodiment of the present invention.
- FIG. 1 is a flowchart for explaining the manufacturing method of the disposable diaper concerning the present invention.
- FIG. 2 is a front view showing a schematic configuration of the ultrasonic welding apparatus according to the first embodiment of the present invention for performing the welding process shown in FIG. 1.
- 3 is a cross-sectional view taken along line III-III
- FIG. 9 is a side sectional view of an ultrasonic welding apparatus according to the third embodiment of the present invention.
- FIG. 10 is a view corresponding to FIG. 7 of an ultrasonic welding apparatus according to the fourth embodiment of the present invention.
- 11 is a cross-sectional view taken along line XI-XI in FIG.
- FIG. 12 is a cross-sectional view showing a state in which the pressed member in FIG. 11 is replaced with another pressed member.
- FIG. 13 is a cross-sectional view showing a movement restricting mechanism provided in the ultrasonic welding apparatus shown in FIG.
- FIG. 14 is an enlarged schematic view showing a part of a conventional ultrasonic welding apparatus, and shows a state where the anvil roller is in a non-welding range.
- FIG. 15 is a schematic view of the ultrasonic welding apparatus shown in FIG. 14 and shows a state in which the anvil roller is located within the welding range.
- the disposable diaper 20 is a wearer's front part 20a arrange
- the both side edges of the front abdomen 20a and the side edges of the back part 20b are welded to each other by two welding parts S so that the front part 20a and the back part 20b are connected in a ring shape.
- the sheet W includes an inner sheet that faces the body surface of the wearer when worn, an outer sheet that faces the wearer when worn, and an elastic member sandwiched between the inner sheet and the outer sheet. .
- the inner sheet is composed of a liquid-permeable nonwoven sheet and / or mesh sheet.
- the outer sheet is made of the same material as the inner sheet, or a polyethylene film, a polypropylene film, or a nonwoven fabric having water repellency and breathability.
- the elastic member is configured using a sheet or thread made of polyurethane, natural rubber, or thermoplastic resin.
- leg hole L is formed at the center position in the vertical direction of the sheet W.
- the area between the two leg holes L in the sheet W is a portion corresponding to the crotch part 20c. Further, the longitudinal side portions of the portion corresponding to the crotch portion 20c in the seat W are portions corresponding to the front abdomen 20a and the back portion 20b, respectively.
- the transport process P1 and the leg hole forming process P2 are preparation processes for preparing a continuous body in which the components in which the front abdomen 20a and the back part 20b are connected in the vertical direction via the crotch part 20c are continuous in the horizontal direction. Equivalent to.
- the absorber A includes a permeable sheet having liquid permeability, a water-repellent sheet having water repellency and breathability, and an absorbent core sandwiched between the permeable sheet and the water-repellent sheet.
- the permeable sheet is composed of a non-woven sheet and / or a mesh sheet having liquid permeability.
- the water repellent sheet is made of a polyethylene film, a polypropylene film, or a nonwoven fabric having water repellency and air permeability.
- the absorbent core is molded by laminating pulverized pulp or a mixture of this with a superabsorbent polymer.
- seat W can also join by inserting an absorptive core between the inner sheet
- the inner sheet is constituted by a nonwoven fabric sheet and / or a mesh sheet having liquid permeability.
- the outer sheet is made of a polyethylene film, a polypropylene film, or a nonwoven fabric having water repellency and breathability.
- ⁇ Welding process P5> In the welding step P5, the portion corresponding to the side edge of the front abdomen 20a and the portion corresponding to the side edge of the back portion 20b in the folded sheet W are ultrasonically welded.
- two locations on the sheet W are ultrasonically welded simultaneously with a gap D2 sandwiching a cutting range set in advance as a range to be cut in a cutting step P6 described later.
- the two welded portions S are respectively formed in the longitudinal welding range D1 of the portion corresponding to the side edge of the front abdomen 20a and the portion corresponding to the side edge of the back portion 20b.
- the ultrasonic welding apparatus 1 is welded by the welding roller 3 for introducing the sheet W folded in the folding process P4, the welding drum 3 for welding the sheet W introduced by the introducing roller 2, and the welding drum 3. And a deriving roller 4 for deriving the sheet W.
- the welding drum 3 includes a sheet holding drum (holding member) 5 that holds the sheet W introduced by the introduction roller 2, six ultrasonic horns (mating side welding tools) 6 provided on the sheet holding drum 5, Six anvil units 7 for ultrasonically welding the sheet W between the ultrasonic horn 6, a cylindrical anvil holding drum 8 (see FIG. 3) for holding each anvil unit 7, and the inside of the anvil holding drum 8 And six pressed members 18 (see FIG. 3) fixed to the sheet holding drum 5 adjacent to the ultrasonic horns 6.
- the sheet holding drum 5 can rotate around the rotation center C1 in a state where the sheet W is held on the outer peripheral surface thereof.
- the sheet holding drum 5 has six concave grooves 5a formed at equal intervals around the rotation center C1. Each concave groove 5a opens outward of the sheet holding drum 5 and extends along the rotation center C1.
- Each ultrasonic horn 6 applies ultrasonic vibration to the sheet W held on the sheet holding drum 5. Since each ultrasonic horn 6 is configured in the same manner, only one ultrasonic horn 6 will be described and description of the other ultrasonic horns 6 will be omitted.
- the ultrasonic horn 6 includes an input side end 6 a having an input surface 6 c for inputting ultrasonic vibration, and a slit extending along the rotation center C ⁇ b> 1 (see FIG. 2) of the sheet holding drum 5. 6d, and an output side end portion 6b having a pair of output surfaces 6e for branching in the direction perpendicular to the rotation center C1 and outputting ultrasonic vibrations on both sides of the slit 6d.
- the width dimension D4 of the slit 6d is a dimension corresponding to the interval D2 (see FIG. 1) between the two welding portions S that are simultaneously welded in the welding process P5.
- the distance between the input surface 6c and each output surface 6e is set to a distance corresponding to a half wavelength (1 / 2 ⁇ ) of ultrasonic vibration input to the input surface 6c.
- the slit 6d is formed in a range from a position corresponding to a node of ultrasonic vibration input to the input surface 6c to an end surface (output surface 6e) of the output side end 6b.
- the ultrasonic vibration input to the ultrasonic horn 6 is a longitudinal wave in a direction orthogonal to the output surface 6e, but is shown as a transverse wave in the graph of FIG. 7 for convenience of explanation.
- the ultrasonic horn 6 is provided in the groove 5 a so that each output surface 6 e comes into contact with the sheet W held on the sheet holding drum 5 from the inside. .
- each output surface 6e is longer than the welding range D1 set on the sheet W, and both end portions in the longitudinal direction of each output surface 6e are welded range D1 ( The sheet W) is arranged so as to protrude on both sides.
- Each anvil unit 7 is provided at the same position as each ultrasonic horn 6 around the rotation center C1. Since each anvil unit 7 has the same configuration, the configuration of one anvil unit 7 will be described, and the description of the other anvil units 7 will be omitted.
- the anvil unit 7 is movable with respect to the sheet holding drum 5 along the rotation center C1 and an anvil roller (moving side welding tool) 10 for welding the sheet W with the ultrasonic horn 6. And a holding member 11 that holds the anvil roller 10.
- the holding member 11 includes a holding member main body 12 attached to the anvil holding drum 8 so as to be movable along the rotation center C ⁇ b> 1, and a rotation shaft with respect to the holding member main body 12.
- a holding lever 19 that is rotatably attached around 19b and holds the anvil roller 10 so as to be rotatable around the rotating shaft 19a, and the holding lever 19 in the direction in which the anvil roller 10 approaches the ultrasonic horn 6.
- a biasing member 25 that biases the lever 19.
- the rotation shaft 19a and the rotation shaft 19b are axes extending in a direction orthogonal to a plane including the rotation center C1 and the anvil unit 7, respectively (direction orthogonal to the paper surface of FIG. 3).
- the rotation shaft 19 a is provided at the tip of the holding lever 19, and the rotation shaft 19 b is provided at the intermediate portion of the holding lever 19.
- the anvil roller 10 can be brought into rolling contact with the sheet W according to the movement of the holding member 11 along the rotation center C ⁇ b> 1, and the sheet W (ultrasonic horn 6) according to the rotation of the holding lever 19. ) In the radial direction of the sheet holding drum 5.
- the urging member 25 urges the anvil roller 10 in the direction in which the anvil roller 10 approaches the ultrasonic horn 6 by urging the base end portion of the holding lever 19 in the direction away from the rotation center C1 with respect to the holding member main body 12. It is fast.
- the urging member 25, the holding lever 19, and the rotating shaft 19b extend over the anvil roller 10 so that the output surface 6e of the ultrasonic horn 6 and a welding surface 10d of the anvil roller 10 described later approach these normal directions. This corresponds to a biasing mechanism that biases toward the sonic horn 6.
- the holding member main body 12 protrudes in the opposite direction in the direction perpendicular to the cam protrusion 14 and the rotation center C1 (left and right direction in FIG. 4), and extends along the rotation center C1. And a pair of engaging protrusions 15 extending in the direction.
- the holding member main body 12 is provided between a pair of rails 17 erected on the outer peripheral surface of the anvil holding drum 8.
- Each rail 17 is formed with an engagement groove 17a that opens to the rail 17 side and extends along the rotation center C1.
- Each engagement protrusion 15 of the holding member body 12 is engaged with the engagement groove 17a so as to be movable along the rotation center C1 with respect to the anvil holding drum 8.
- the cylindrical anvil holding drum 8 is provided with a slit 16a that penetrates the peripheral wall and extends along the rotation center C1.
- the cam projection 14 of the holding member body 12 is inserted into the anvil holding drum 8 through the slit 16a.
- a cam drum 9 is provided in the anvil holding drum 8, and a cam groove 9 a is formed on the outer peripheral surface of the cam drum 9.
- the tip of the cam projection 14 is inserted into the cam groove 9a.
- the cam groove 9a guides the cam protrusion 14 so that the anvil unit 7 moves along the rotation center C1 in response to the rotation of the anvil holding drum 8 with respect to the cam drum 9.
- the sheet holding drum 5 and the anvil holding drum 8 are fixed to each other, and both rotate integrally around the rotation center C1.
- the rotational position of the cam drum 9 is fixed regardless of the rotation of the sheet holding drum 5 and the anvil holding drum 8. Therefore, the holding member main body 12 moves along the rotation center C1 according to the rotation of the sheet holding drum 5 and the anvil holding drum 8 around the rotation center C1.
- the lowermost anvil unit 7 in FIGS. 2 and 3 is disposed at a position away from the sheet W held on the sheet holding drum 5 in plan view. In this state, as the sheet holding drum 5 rotates counterclockwise in FIG. 2, the anvil unit 7 moves in the direction approaching the sheet W along the rotation center C1.
- the anvil roller 10 crosses the sheet W, and in the uppermost anvil unit 7 in FIGS.
- the anvil roller 10 is disposed at a position away from the sheet W held on the sheet holding drum 5.
- the anvil roller 10 crosses the sheet W again and returns to the position of the anvil roller 10 at the lowest position in FIGS.
- the anvil roller 10 reciprocates on the sheet W in the welding range D1 in FIG. 1 in the range E1 in FIG. 2, and the sheet W is welded during this reciprocating movement. More specifically, the anvil roller 10 located in a range other than the range E1 in FIG. 2 is located in the range E4 in FIG. 5 that is out of the sheet W in plan view, and the anvil roller 10 enters the range E1. The anvil roller 10 sequentially moves in a range E3 that overlaps the sheet W in plan view, a range E2 that deviates from the sheet W in the plan view, and the range E3.
- the range E4 and the range E2 correspond to the non-welding range, and the range E3 corresponds to the welding range.
- the first to third embodiments they are referred to as non-welding ranges E2, E4 and welding range E3.
- the pressed member 18 has a width dimension D6 smaller than the width dimension D4 of the slit 6d of the ultrasonic horn 6 and is a plate-like member provided within a range in the width direction of the slit 6d. Further, the width dimension D6 of the pressed member 18 is smaller than the distance D5 between the pair of protruding portions 10b of the anvil roller 10.
- each protrusion 10b protrudes from the outer peripheral surface of the disk-shaped roller main body 10a over the entire periphery, and has a welding surface 10d for welding the sheet W between the output surface 6e of the ultrasonic horn 6 respectively. .
- a portion between the protruding portions 10b constitutes a supported surface 10c that can be brought into rolling contact with the pressed member 18 described later.
- the pressed member 18 has a length dimension D7 larger than the length dimension D3 of the ultrasonic horn 6, and is disposed along the rotation center C1. Specifically, both end portions in the longitudinal direction of the pressed member 18 are respectively disposed outside the ultrasonic horn 6 and are fixed to the sheet holding drum 5 by a pair of bolts B1.
- the to-be-pressed member 18 has the proximal end side guide part 21 arrange
- the central portion 22 has a non-guide surface 22a disposed on the same plane as the output surface 6e of the ultrasonic horn 6 or at a position closer to the rotation center C1 than the output surface 6e.
- the proximal guide portion 21 is inclined from the non-guide surface 22 a toward the outer side in the radial direction of the sheet holding drum 5 toward the direction away from the central portion 22, and from the inclined surface toward the direction away from the central portion 22. It has a proximal guide surface 21a including a non-guide surface 22a (output surface 6e) and a flat surface extending in a parallel direction.
- the front end side guide portion 23 is inclined toward the direction away from the central portion 22, and is inclined toward the outer side in the radial direction of the sheet holding drum 5 from the non-guide surface 22 a and inclined toward the direction away from the central portion 22. It has the front end side guide surface 23a including the flat surface extended in the direction parallel to the non-guide surface 22a from a surface.
- the guide surfaces 21a and 23a are supported by the anvil roller 10 located in the non-welding ranges E2 and E4 by the urging force of the urging mechanism (the urging member 25, the holding lever 19 and the rotating shaft 19b). This corresponds to the pressed surface to which the surface 10c is pressed. Further, the pressed member 18 is fixed to the sheet holding drum 5 in a state in which both guide surfaces 21a and 23a are arranged within the range in the width direction of the slit 16a.
- the guide surfaces 21a and 23a are brought into a non-welding range by rolling and contacting the supported surface 10c of the anvil roller 10 in accordance with the movement of the anvil roller 10 from the welding range E3 to the non-welding ranges E2 and E4.
- the anvil roller 10 located in E2 and E4 is moved away from the sheet W (ultrasonic horn 6).
- the supported surface 10c is an outer peripheral surface (outer surface) of the roller body 10a located between the protruding portions 10b of the anvil roller 10.
- the end portion of the proximal end side guide portion 21 including the proximal end side guide surface 21a and the end portion of the distal end side guide portion 23 including the distal end side guide surface 23a are inserted between the protruding portions 10b of the anvil roller 10, respectively.
- the anvil rollers 10 are engaged with each other so that the movement of the anvil roller 10 in the direction orthogonal to the urging direction (left-right direction in FIG. 7) is restricted.
- the welding surface 10d of the anvil roller 10 is applied to the output surface 6e of the ultrasonic horn 6 with the sheet W sandwiched by the urging force of the urging member 25. It is pressed.
- the ultrasonic wave is applied to the ultrasonic horn 6 to ultrasonically weld the sheet W.
- the supported surface 10c of the anvil roller 10 comes into contact with the inclined surface of the guide surfaces 21a and 23a. Further, when the movement of the anvil roller 10 proceeds, the anvil roller 10 is brought into rolling contact with the guide surfaces 21a and 23a (inclined surfaces) and gradually along the inclined surface against the urging force by the urging member 25. Away from the ultrasonic horn 6. And if the movement of the anvil roller 10 further advances, the anvil roller 10 will be in the state supported by the flat surface of the guide surfaces 21a and 23a.
- both guide surfaces 21a and 23a have a shape capable of guiding the anvil roller 10 in a direction in which the output surface 6e and the welding surface 10d move away from each other in the normal direction against the urging force of the urging member 25. .
- the welding surface 10d of the anvil roller 10 is separated from the output surface 6e of the ultrasonic horn 6 by a preset dimension (a dimension larger than the amplitude of the ultrasonic vibration). Therefore, it is possible to prevent the ultrasonic horn 6 and the anvil roller 10 from being worn and deteriorated due to the ultrasonic vibration applied to the ultrasonic horn 6 being transmitted to the anvil roller 10.
- the anvil roller 10 starts to move from the non-welding ranges E2 and E4 toward the welding range E3, the anvil roller 10 is brought into rolling contact with the guide surfaces 21a and 23a, and is inclined to the inclined surface by the urging force of the urging member 25.
- the ultrasonic horn 6 is gradually approached along. Further, when the anvil roller 10 moves, the anvil roller 10 reaches the welding range E3.
- the urging mechanism (the urging member 25, the holding lever 19, and the rotating shaft 19b) and the pressed member 18 have the output surface 6e and the welding surface 10d approach each other in the welding range E3 and the non-welding ranges E2 and E4.
- the anvil roller 10 is biased toward the ultrasonic horn 6, and the outer surface of the anvil roller 10 located in the non-welding ranges E ⁇ b> 2 and E ⁇ b> 4 is guided by the biasing force to the guide surface 21 a of the pressed member 18. , 23a.
- the anvil roller 10 is guided by the guide surfaces 21a and 23a in a direction in which the output surface 6e and the welding surface 10d move away from each other in accordance with the movement of the anvil roller 10 from the welding range E3 to the non-welding ranges E2 and E4. be able to.
- the output surface 6e and the welding surface 10d are brought close to the normal direction of these surfaces by the urging force of the urging member 25 so that the sheet W is superposed between them. Sonic welding is possible.
- the anvil roller 10 is guided along the guide surfaces 21a and 23a in accordance with the movement of the anvil roller 10 from the welding range E3 to the non-welding ranges E2 and E4, whereby the output surface 6e and the welding surface 10d are mutually connected. You can keep away.
- the configuration for driving the anvil closer to or away from the ultrasonic horn (cylinder and configuration for applying a driving force thereto) and the drive control of the anvil can be omitted.
- each output surface 6e is in the closest position to each output surface 6e. 10d, the welding surface 10d of the anvil roller 10 can be reliably moved away.
- the output amplitude from each output surface 6e can be increased.
- the sheet W can be reliably ultrasonically welded.
- the anvil roller 10 is folded back in the non-welding ranges E2 and E4 located outside the welding range E3 and moved to the welding range E3.
- the sheet W is welded even at the turning point of the movement of the anvil roller 10
- the ultrasonic energy is given to the sheet W even when the anvil roller 10 is decelerated and accelerated, it is uniform in the moving direction. It is difficult to perform welding.
- the welding in the welding range E3 can be performed uniformly by setting the turning point of the anvil roller 10 outside the welding range E3 as described above.
- the ultrasonic welding apparatus 1 has the following effects.
- the output surface 6e and the welding surface 10d can be separated from each other in the normal direction by the guide surfaces 21a and 23a. Therefore, the welding range E3 and the non-welding ranges E2 and E4 can be appropriately set within the range of the output surface 6e in the moving direction of the anvil roller 10.
- the anvil roller 10 and the pressed member 18 in the non-welding ranges E2 and E4 can be positioned in a direction orthogonal to the moving direction and the urging direction of the anvil roller 10.
- the anvil roller 10 and the ultrasonic horn 6 can be positioned, whereby the anvil roller 10 and the ultrasonic horn 6 moved to the welding range E3. It is possible to reliably perform welding between the two.
- the anvil roller 10 in the non-welding ranges E2 and E4 is used with the supported surface 10c (region between the protruding portions 10b) that does not contribute to the welding of the sheet W in the anvil roller 10.
- the pressed member 18 can be engaged.
- the non-welding ranges E2 and E4 can be set at two locations across the welding range E3. Therefore, the sheet W can be reliably welded while preventing the wear and deterioration of the anvil roller 10 and the ultrasonic horn 6 by reciprocating the anvil roller 10 between these two non-welding ranges E2, E4. it can.
- the slit 6d can reduce the weight of only the portion of the ultrasonic horn 6 closer to the output surface 6e than the node of ultrasonic vibration, so that the output amplitude can be increased.
- the slit 6d is formed in a range from the position corresponding to the node of the ultrasonic vibration to the end surface (output surface 6e) of the output side end 6b. 6 can be reduced to the maximum.
- the output amplitude is effectively increased. Can do.
- the sheet W can be welded in a state where the output amplitude is increased by using the ultrasonic horn 6 having the slit 6d, and
- the anvil roller 10 located in the non-welding ranges E2 and E4 can be moved away from the ultrasonic horn 6 by the pressed member 18 provided in the width range of the slit 6d.
- the ultrasonic horn 6 and the anvil roller 10 are worn and deteriorated by moving the anvil roller 10 located in the non-welding ranges E2 and E4 away from the ultrasonic horn 6 while reliably welding the sheet W with a large output amplitude. Can be prevented.
- the disposable diaper 20 can be manufactured by cutting the sheet W in the range between S).
- the guide surfaces 21 a and 23 a are provided on the pressed member 18, but the guide surfaces may be provided on at least one of the pressed member 18 and the anvil roller 10.
- the anvil roller 10A is provided with a guide surface (the outer peripheral surface of the large-diameter portion 10e). Further, the pressed member 18A according to the second embodiment is provided on the same plane as the output surface 6e of the ultrasonic horn 6 as a surface for the outer peripheral surface of the large-diameter portion 10e of the anvil roller 10A to make rolling contact. It has a flat surface 18b.
- the anvil roller 10A includes a large-diameter portion 10e protruding from the supported surface 10c between the pair of protruding portions 10b.
- the large-diameter portion 10e is disposed concentrically with the cylindrical portion that defines the supported surface 10c, and is provided in an angle range of 180 °.
- the outer peripheral surface of the large diameter portion 10e and the supported surface 10c are connected to each other by two inclined surfaces 10f.
- half of the outer peripheral surface of the large-diameter portion 10e (90 ° range) and one inclined surface 10f constitute a guide surface for the non-welding range E2.
- the remaining half of the outer peripheral surface of the large-diameter portion 10e and the remaining one inclined surface 10f constitute a guide surface for the non-welding range E4.
- the welding surface 10d of the anvil roller 10A is pressed against the output surface 6e of the ultrasonic horn 6 with the sheet W sandwiched by the urging force of the urging member 25. At the same time, it comes into rolling contact with the sheet W.
- the ultrasonic wave is applied to the ultrasonic horn 6 to ultrasonically weld the sheet W.
- the inclined surface 10f of the anvil roller 10A comes into contact with the flat surface 18b of the pressed member 18.
- the inclined surface 10f of the anvil roller 10A comes into rolling contact with the flat surface 18b of the pressed member 18, and the welding surface 10d of the anvil roller 10A is attached by the urging member 25. It gradually moves away from each output surface 6e of the ultrasonic horn 6 along the inclined surface 10f against the force.
- the large-diameter portion 10e of the anvil roller 10A is supported by the flat surface 18b of the pressed member 18.
- the ultrasonic horn is applied to the welding surface 10d of the anvil roller 10A against the urging force of the urging member 25 in accordance with the movement of the anvil roller 10A from the welding range E3 to the non-welding ranges E2 and E4. 6 away from the output surface 6e.
- the outer peripheral surface of the large-diameter portion 10e and the flat surface 18b of the pressed member 18 are allowed to move toward the welding range E3 of the anvil roller 10A and are orthogonal to the moving direction and the biasing direction by the biasing member 25. It is also possible to provide engaging portions that can be engaged with each other so as to restrict the movement of the anvil roller 10A in the moving direction.
- the ultrasonic horn 6 and the anvil roller 10 can be relatively displaced, but both the ultrasonic horn 6 and the anvil roller 10 are relatively displaced with respect to the sheet holding drum 5. You can also That is, the ultrasonic horn 6 that is the counterpart welding tool may be displaced relative to the sheet holding drum 5.
- the ultrasonic horn 6 according to the third embodiment is held by the holding member body 12 of the anvil unit 7. Accordingly, the ultrasonic horn 6 moves relative to the sheet holding drum 5 in accordance with the movement of the anvil unit 7.
- FIG. 9 shows a state in which the anvil roller 10 is displaced to the non-welding range E4. In this state, the end of the pressed member 18B is inserted into the slit 6d of the ultrasonic horn 6.
- the end (the end on the right side in FIG. 9) that is always inserted into the slit 6d in the pressed member 18B is a free end, while the end 18a on the opposite side of the pressed member 18B is It is fixed with two bolts B1. Thereby, the pressed member 18B can be reliably fixed to the sheet holding drum 5.
- the welding surface 10d of the anvil roller 10 is placed on the ultrasonic horn against the urging force of the urging member 25 according to the movement of the anvil roller 10 from the welding range E3 to the non-welding ranges E2 and E4. 6 away from the output surface 6e in the normal direction of these surfaces.
- the pressed member 18 for moving the output surface 6e and the welding surface 10d away from each other in the normal direction of these surfaces has been described.
- the pressed member includes the output surface 6e and the welding surface 10d as an anvil roller. It may be for moving away in the moving direction of 10B.
- the welding range E6 that is the same as the length dimension D3 of the output surface 6e of the ultrasonic horn 6 and the non-welding ranges E5 and E7 that deviate from the welding range E6 in plan view. Is set.
- FIG. 11 shows an example in which the sheet W is supplied so as to cover the welding range E6 and the non-welding range E5, the sheet W only needs to be supplied so as to cover at least the welding range E6.
- the ultrasonic welding apparatus includes an attachment plate 24 fixed to the sheet holding drum 5 (see FIG. 3) and a pair of pressed members 26A attached to the attachment plate 24.
- the mounting plate 24 is positioned between the pair of insertion holes 24a for passing the portions branched by the slit 6d of the ultrasonic horn 6 and between the insertion holes 24a, and between the branched portions of the ultrasonic horn 6. And a passage portion 24b that passes through.
- the pressed member 26A has a guide surface 26c (pressed surface) to which the anvil roller 10B located in the non-welding range E5 is pressed by the biasing force of the biasing member 25 (see FIG. 3).
- the pressed member 26A includes a main body portion 26a having a guide surface 26c and a pair of attachment portions 26b for attaching the main body portion 26a to the attachment plate 24, and has a thickness smaller than the width dimension D4 of the slit 6d. It has a dimension D8.
- the main body 26a is a substantially rectangular plate-like portion fixed to the mounting plate 24 (sheet holding drum 5) in a state where the guide surface 26c is disposed within the range of the slit 6d in the width direction. Further, the main body 26a is arranged such that the guide surface 26c is continuous with the output surface of the ultrasonic horn 6 in the moving direction of the anvil roller 10B, and the guide surface 26c is arranged on the same plane as the output surface 6e of the ultrasonic horn 6. As shown in FIG. Specifically, the main body 26a is disposed so as to extend from the end face of the ultrasonic horn 6 in a direction away from the ultrasonic horn 6 in a side view shown in FIG.
- the pressed member 26 ⁇ / b> A may be attached to the mounting plate 24 in a state where a part of the guide surface 26 c enters the slit 6 d of the ultrasonic horn 6. Conversely, a gap that allows the anvil roller 10B to move smoothly between the guide surface 26c and the output surface 6e may be provided between the guide surface 26c and the output surface 6e.
- the pair of attachment portions 26b protrude from the main body portion 26a in the moving direction of the anvil roller 10B and are provided on both sides of the main body portion 26a.
- One attachment portion 26b is disposed in the slit 6d of the ultrasonic horn 6, and the other attachment portion 26b is disposed outside the slit 6d.
- the mounting portion 26b is formed with an insertion hole (not shown) for passing the bolt B2, and the tip of the bolt B2 passed through the insertion hole is screwed into the screw hole 24d of the mounting plate 24 to be pressed.
- the member 26A can be attached to the attachment plate 24.
- the anvil roller 10B has a supported portion 10g having the same radius as each protruding portion 10b, as shown in FIG. Specifically, the supported portion 10g protrudes radially outward from the roller body 10a between the pair of protruding portions 10b.
- the outer peripheral surface (outer surface) of the supported portion 10g functions as a supported surface 10c that is pressed against the guide surface 26c of the pressed member 26A.
- the welding surface 10d of the anvil roller 10B located within the welding range E6 is pressed against the output surface 6e of the ultrasonic horn 6 by the urging force of the urging member 25, and the sheet W between the welding surface 10d and the output surface 6e. Is welded.
- the supported surface (outer surface) 10c of the anvil roller 10B located in the non-welding ranges E5 and E7 is pressed against the guide surface 26c or the sheet W by the urging force of the urging member 25.
- the anvil roller 10B when the anvil roller 10B moves to a position away from the ultrasonic horn 6, the anvil roller 10B can be guided in the moving direction. Thereby, the output surface 6e and the welding surface 10d can be moved away from each other in the moving direction of the anvil roller 10B.
- the ultrasonic welding apparatus has a welding range between the welding range E6 and the non-welding ranges E5 and E7 shown in FIG. 11 and the welding range E9 and the non-welding ranges E8 and E10 shown in FIG. Switching is possible.
- the welding range E9 is set within the range of the length dimension D3 of the ultrasonic horn 6.
- the ultrasonic welding apparatus includes a pair of pressed members 26B having a guide surface 26d having a shape different from that of the pressed member 26A described above. Since both pressed members 26B have the same configuration, only the pressed member 26B for defining the non-welding range E8 will be described. Further, since the pressed member 26B has the same configuration except the pressed member 26A and the guide surface 26d described above, only the guide surface 26d will be described.
- the guide surface 26d is parallel to the output surface 6e from the inclined surface that is inclined outward in the radial direction of the sheet holding drum 5 from the welding range E9 toward the non-welding range E8 and toward the direction away from the welding range E9. And a flat surface extending in the direction.
- the welding surface 10d is moved from the output surface 6e against the urging force of the urging member 25 by the guide surface 26d. Guided in a direction away from the normal direction.
- the mounting plate 24 allows the pressed members 26A and 26B to be mounted at two mounting positions set at different positions in the moving direction of the anvil roller 10B.
- the mounting plate 24 has a pair of outer screw holes 24c for mounting the above-described pressed member 26A and a pair of inner screw holes 24d for mounting the pressed member 26B.
- the welding range E9 and the non-welding ranges E8 and E10 are defined by screwing the bolt B2 passed through the insertion hole of the mounting portion 26b of the pressed member 26B into the inner screw hole 24d.
- the pressed member 26 ⁇ / b> B can be attached to the attachment plate 24.
- the bolt B2 passed through the insertion hole of the mounting portion 26b of the pressed member 26A is screwed into the outer screw hole 24c.
- the pressed member 26A can be attached to the mounting plate 24 so that E6 and the non-welding ranges E5 and E7 are defined.
- the pitch between the outer screw holes 24c and the pitch between the inner screw holes 24d are set to be equal to each other, and both the pressing members 26A and 26B from the mounting portion 26b to the end portions of the guide surfaces 26c and 26d. Are set to the same distance. Therefore, the pressed member 26B can be attached to the attachment plate 24 using the outer screw hole 24c.
- the welding surface 10d is moved away from the output surface 6e in the normal direction by the guide surface 26d of the pressed member 26B.
- the welding range E6 and the welding range E9 can be switched by one type of pressed member 26B.
- An attachment portion that allows attachment of the pressed members 26A and 26B to the sheet holding drum 5 (attachment plate 24) so that the mounting positions of the pressed members 26A and 26B can be continuously adjusted in the moving direction of the anvil roller 10B. It may be provided on at least one of the pressed members 26A and 26B and the sheet holding drum 5 (mounting plate 24).
- a free range E11 in which the anvil roller 10B is not pressed against the pressed member 26A can be set outside the non-welding range E7 described above.
- a holding mechanism 27 is provided for holding the height position of the anvil roller 10B moved to the free range E11 at a position where the anvil roller 10B can return onto the guide surfaces 26c and 26d. .
- the holding mechanism 27 includes a bracket 27a provided on the holding member main body 12 (see FIG. 3), and a stopper bolt 27b penetrating the bracket 27a in the vertical direction.
- the stopper bolt 27b is provided at a position where the stopper bolt 27b can come into contact with the proximal end portion of the holding lever 19 that has been moved to a preset height position in accordance with rotation about the rotation shaft 19b. Further, the stopper bolt 27b can adjust the height position where it comes into contact with the holding lever 19 by adjusting the tightening degree of the screw hole (reference numeral omitted) formed in the bracket 27a.
- the height position of the anvil roller 10B held by the stopper bolt 27b is set equal to or slightly lower than the height position of the anvil roller 10B located in the welding range E6.
- the anvil roller 10B can be held in a state where the anvil roller 10B is not pressed against the pressed members 26A and 26B within the free range E11. Therefore, the anvil roller 10B can be easily replaced.
- anvil roller 10 is illustrated as a movement side welding tool and the ultrasonic horn 6 is illustrated as an other party welding tool, the ultrasonic horn as a movement side welding tool and the other party welding tool are illustrated. It is also possible to provide an ultrasonic welding apparatus having an anvil.
- the ultrasonic horn can be attached to the sheet holding drum 5 so that the ultrasonic horn can move between the welding range and the non-welding range with respect to the sheet holding drum 5.
- the end including the welding surface of the counterpart welding tool (anvil) is provided with a slit for branching the end. Further, since it is not preferable that the ultrasonic horn and the pressed member are in direct contact with each other, it is preferable to press the portion for supporting the ultrasonic horn against the sheet holding drum 5 against the pressed member.
- the counterpart welding tool (anvil) may be fixed to the sheet holding drum 5 as in the first embodiment, but is movable relative to the sheet holding drum 5 as in the third embodiment. It may be attached.
- the welding tool that can move with respect to the sheet holding drum 5 can be formed by a roller that can be brought into rolling contact with the sheet W and the pressed member along with the movement. preferable.
- the one pressed member 18, 18A, 18B extending over the non-welding range E2, the welding range E3, and the non-welding range E4 has been described.
- the pressed member may be provided at least in a range corresponding to the non-welding range.
- one pressed member may be provided in a range corresponding to the non-welding range E2, and another pressed member may be provided in a range corresponding to the non-welding range E4.
- the non-welding range is set to only one place, it is sufficient that one guide member is provided there.
- the anvil roller 10B is regulated so that the movement of the anvil roller 10B in the direction orthogonal to the moving direction of the anvil roller 10B and the urging direction by the urging member 25 is restricted.
- the pressed members 26A and 26B may be engaged with each other.
- the present invention is an ultrasonic welding apparatus for ultrasonically welding a material to be welded, a holding member for holding the material to be welded, and applying ultrasonic vibration to the material to be welded.
- a pair of welding tools each having an ultrasonic horn having an output surface, and an anvil having a welding surface for welding the welded material between the output surfaces of the ultrasonic horn, of the pair of welding tools
- the moving-side welding tool which is one of the above, is a counterpart of the other of the pair of welding tools, in which the output surface or the welding surface of the moving-side welding tool overlaps the object to be welded held by the holding member in plan view.
- a pair of welding tools that are movable with respect to the holding member over a welding range in which the object to be welded is welded to a side welding tool and a non-welding range that is out of the welding range in plan view;
- the output surface and the welding surface A displacement mechanism for displacing the moving welding tool relative to the mating welding tool so that the output surface and the welding surface move away from each other in the non-welding range, and the mating welding tool includes:
- the output surface or the end including the welding surface is branched in a direction perpendicular to the moving direction by a slit extending in the moving direction of the moving-side welding tool, and is positioned on both sides of the slit.
- the displacement mechanism has a pair of end surfaces that function as the welding surfaces, and the displacement mechanism directs the moving welding tool toward the mating welding tool so that the output surface and the welding surface approach the normal line direction.
- the moving-side welding tool is urged toward the mating-side welding tool, and the outer side surface of the moving-side welding tool positioned in the non-welding range is pressed against the pressed surface of the pressed member by this biasing force. .
- the moving-side welding tool moves in a direction in which the output surface and the welding surface move away from each other in accordance with the movement-side welding tool moving from the welding range to the non-welding range. Can be guided.
- the moving welding tool when the moving welding tool is moved to the welding range, the output surface and the welding surface are brought close to the normal direction of these surfaces by the urging force of the urging mechanism, and the object to be welded is ultrasonically welded between them. can do.
- the moving side welding tool moves from the welding range to the non-welding range, the moving side welding tool is guided along the guide surface, whereby the output surface and the welding surface can be moved away from each other.
- the configuration for driving the anvil closer to or away from the ultrasonic horn (the configuration that provides the driving force to the cylinder) and the drive control of the anvil can be omitted. it can.
- each end surface is located at a position closest to each end surface of the mating welding tool.
- the moving-side welding tool can be reliably moved away from.
- the movement side welding tool is movable over a welding range and a non-welding range.
- the non-welding range is at a position deviating from the welding range in plan view. That is, the moving-side welding tool is folded back in the non-welding range located outside the welding range and moves to the welding range.
- the welding in the welding range can be performed uniformly by setting the turning point of the moving-side welding tool outside the welding range as in the present invention.
- the pressed surface is disposed within the range in the width direction of the slit” means that the pressed surface in the depth direction of the slit (moving direction of the moving welding tool) or the depth direction of the slit. Is arranged outside the slit.
- the outer surface of the moving welding tool positioned within the non-welding range is pressed by the biasing force of the biasing mechanism means that the pressed surface and the outer surface of the moving welding tool This includes the case where the outer surface of the moving welding tool is pressed against the pressed surface in the state where the welded object exists between the two.
- the guide surface can guide the moving-side welding tool in a direction in which the output surface and the welding surface move away from each other in the normal direction against the biasing force of the biasing mechanism. It is preferable to have a different shape.
- the output surface and the welding surface can be separated from each other in the normal direction by the guide surface. Therefore, the welding range and the non-welding range can be appropriately set within the range of the output surface or the welding surface of the counterpart welding tool in the moving direction of the moving welding tool.
- the holding member may include a pressed member mounting portion that allows the pressed member to be attached to a plurality of mounting positions set at different positions in the moving direction of the moving welding tool. preferable.
- the welding range and the non-welding range can be changed at a plurality of locations in the moving direction of the moving side welding tool. Therefore, it is possible to provide an ultrasonic welding apparatus capable of manufacturing a plurality of products having different welding ranges.
- the guide surface is connected to the output surface and the welding surface.
- the surface may have a shape capable of guiding the moving-side welding tool in a direction away from each other in the moving direction of the moving-side welding tool.
- the moving-side welding tool moves to a position away from the counterpart-side welding tool
- the moving-side welding tool is guided in the moving direction so that the output surface and the welding surface are moved in the moving direction. Can be separated from each other.
- the moving-side welding tool and the pressed member that are located in the non-welding range allow the moving-side welding tool to move toward the welding range, and the moving direction and the attaching member. It is preferable that they are engaged with each other so that the movement of the moving-side welding tool in the direction orthogonal to the urging direction by the urging mechanism is restricted.
- the moving side welding tool and the pressed member positioned within the non-welding range can be positioned in a direction orthogonal to the moving direction and the urging direction of the moving side welding tool.
- the movement-side welding tool and the mating welding tool can be positioned, whereby the moving-side welding tool moved to the welding range and the mating welding It is possible to reliably perform welding with the tool.
- the moving-side welding tool includes a roller main body having an outer surface capable of rolling contact with the pressed member, and a pair of the counterpart welding tool that protrudes outward from the roller main body.
- a pair of protrusions for welding the object to be welded between the end surfaces, and the pressed member is inserted between the pair of protrusions in the moving-side welding tool located within the non-welding range. It is preferable to have a portion to be inserted.
- the ultrasonic welding apparatus moves the moving-side welding tool in a direction in which the output surface and the welding surface are away from each other at both sides of the welding range in the moving direction of the moving-side welding tool.
- the non-welding range can be set at two positions on both sides of the welding range. Therefore, by reciprocating the moving-side welding tool between these two non-welding ranges, the welding object can be reliably welded while preventing the wear and deterioration of the moving-side welding tool and the counterpart welding tool. it can.
- the ultrasonic horn is branched by the input side end portion having an input surface to which ultrasonic vibration is input, and outputs ultrasonic vibration at both sides of the slit.
- a mating welding device having an output side end portion having a pair of output surfaces, and a distance between the input surface of the ultrasonic horn and each output surface of the ultrasonic horn is input to the input surface.
- the slit is set to a distance corresponding to a half wavelength of the ultrasonic vibration, and the slit extends from a position corresponding to the node of the ultrasonic vibration or a position closer to each output surface to an end surface of the output end. It is preferable that it is formed in the range.
- the output amplitude increases as the ratio of the mass of the portion on the output surface side to the mass of the portion on the input surface side with respect to the input ultrasonic vibration node becomes smaller. ing.
- the amplitude of the ultrasonic vibration output from each output surface can be reduced. (Hereinafter referred to as output amplitude) can be increased.
- the ultrasonic horn can be reduced in weight by the slit.
- the “node” is a position where the amplitude is minimum (0) in the waveform of the ultrasonic vibration.
- this invention uses the said ultrasonic welding apparatus, between the front abdominal part arrange
- a disposable diaper having a crotch portion extending through the crotch portion through the crotch portion and having a longitudinally connected component through the crotch portion.
- a preparation process for preparing a continuous body that is continuous in a direction, a two-fold process for folding the continuous body in half in a vertical direction, and the moving-side welding tool is moved over the welding range and the non-welding range.
- a method for manufacturing a disposable diaper comprising: a welding step of simultaneously welding two portions of an overlapping portion with a corresponding portion; and a cutting step of cutting the continuous body between two welding portions formed in the welding step.
- the moving welding tool positioned in the non-welding range can be moved away from the mating welding tool by the pressed member provided in the slit width range.
- the moving-side welding tool and the mating welding tool can be prevented from being worn and deteriorated by moving the moving-side welding tool located within the non-welding range away from the mating welding tool.
- this invention is two places (welding place of two adjacent disposable diapers) in the folding
- the continuous body is cut in the non-welded range of the continuous body defined by the slits (range between the two welded portions), whereby a disposable diaper can be manufactured.
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Abstract
Description
搬送工程P1では、特定方向に延びるシートWをその長手方向に沿って搬送する。以下、シートWの流れ方向を横方向とし、図1において横方向と直交する方向を縦方向として説明する。
レッグホール形成工程P2では、シートWの縦方向の中央位置にレッグホールLを形成する。
吸収体接合工程P3では、シートWにおける2つのレッグホールLの間の位置に吸収体Aを接合する。
二つ折り工程P4では、吸収体Aが載置されたシートW(連続体)を縦方向に二つ折りにする。これにより、シートWにおける前腹部20aに相当する部分と後背部20bに相当する部分とが重ね合わされる。
溶着工程P5では、二つ折りにされたシートWにおける前腹部20aの側縁部に相当する部分と後背部20bの側縁部に相当する部分とを超音波溶着する。
切断工程P6では、溶着工程P5で形成された2つの溶着部Sの間で縦方向に延びる切断線に沿ってシートWを切断する。これにより、シートW(連続体)が使い捨ておむつ20ごとに切り分けられる。
以下、図2を参照して、溶着工程P5を行なう第1実施形態に係る超音波溶着装置1について説明する。
第1実施形態では、被押付部材18に案内面21a、23aが設けられているが、案内面は、被押付部材18及びアンビルローラ10の少なくとも一方に設けられていればよい。
前記各実施形態に係る超音波溶着装置では、超音波ホーン6とアンビルローラ10とが相対変位可能であるが、超音波ホーン6及びアンビルローラ10の双方をシート保持ドラム5に対して相対変位させることもできる。つまり、相手側溶着具である超音波ホーン6がシート保持ドラム5に対して相対変位してもよい。
前記実施形態では、出力面6eと溶着面10dとをこれらの面の法線方向に遠ざけるための被押付部材18について説明したが、被押付部材は、出力面6eと溶着面10dとをアンビルローラ10Bの移動方向に遠ざけるためのものであってもよい。
Claims (9)
- 被溶着物を超音波溶着するための超音波溶着装置であって、
被溶着物を保持する保持部材と、
前記被溶着物に超音波振動を与える出力面を有する超音波ホーンと、前記超音波ホーンの出力面との間で前記被溶着物を溶着する溶着面を有するアンビルとを有する一対の溶着具であって、前記一対の溶着具のうちの一方である移動側溶着具は、当該移動側溶着具の出力面又は溶着面が前記保持部材に保持された被溶着物に平面視で重なるとともに前記一対の溶着具のうちの他方である相手側溶着具との間で前記被溶着物を溶着する溶着範囲と平面視で前記溶着範囲から外れた非溶着範囲とに亘って前記保持部材に対して移動可能である、一対の溶着具と、
前記溶着範囲において前記出力面と前記溶着面とが互いに近づくとともに前記非溶着範囲において前記出力面と前記溶着面とが互いに遠ざかるように、前記移動側溶着具を前記相手側溶着具に対して変位させる変位機構とを備え、
前記相手側溶着具の前記出力面又は前記溶着面を含む端部は、前記移動側溶着具の移動方向に延びるスリットにより前記移動方向と直交する方向に分岐しているとともに前記スリットの両側に位置して前記出力面又は前記溶着面として機能する一対の端面を有し、
前記変位機構は、前記出力面と前記溶着面とがこれらの法線方向に近づくように前記移動側溶着具を前記相手側溶着具に向けて付勢する付勢機構と、前記付勢機構の付勢力によって前記非溶着範囲内に位置する前記移動側溶着具の外側面が押し付けられる被押付面を有し、かつ、前記被押付面が前記スリットの幅方向の範囲内に配置された状態で前記保持部材に固定された被押付部材とを備え、
前記被押付部材の被押付面及び前記移動側溶着具の外側面の少なくとも一方は、前記移動側溶着具が前記溶着範囲から前記非溶着範囲に移動することに応じて前記出力面と前記溶着面とが互いに遠ざかる方向に前記移動側溶着具を案内する案内面として機能する、超音波溶着装置。 - 前記案内面は、前記付勢機構の付勢力に抗して前記出力面と前記溶着面とがこれらの法線方向に互いに遠ざかる方向に前記移動側溶着具を案内可能な形状を有する、請求項1に記載の超音波溶着装置。
- 前記保持部材は、前記移動側溶着具の移動方向において異なる位置に設定された複数の取付位置に対する前記被押付部材の取り付けを許容する被押付部材取付部を有する、請求項2に記載の超音波溶着装置。
- 前記非溶着範囲は、前記相手側溶着具の出力面又は溶着面から前記移動側溶着具の移動方向に外れた位置に設定され、
前記案内面は、前記出力面と前記溶着面とが前記移動側溶着具の移動方向に互いに遠ざかる方向に前記移動側溶着具を案内可能な形状を有する、請求項1~3の何れか1項に記載の超音波溶着装置。 - 前記非溶着範囲内に位置する移動側溶着具と前記被押付部材とは、前記移動側溶着具の前記溶着範囲へ向けた移動を許容するとともに前記移動方向及び前記付勢機構による付勢方向と直交する方向における移動側溶着具の移動が規制されるように、互いに係合している、請求項1~4の何れか1項に記載の超音波溶着装置。
- 前記移動側溶着具は、前記被押付部材に対して転がり接触可能な外側面を有するローラ本体と、前記ローラ本体から外側に突出するとともに前記相手側溶着具の一対の端面との間で前記被溶着物を溶着する一対の突出部とを備え、
前記被押付部材は、前記非溶着範囲内に位置する移動側溶着具における前記一対の突出部の間に挿入される被挿入部を有する、請求項5に記載の超音波溶着装置。 - 前記超音波溶着装置は、前記移動側溶着具の移動方向における前記溶着範囲の両側位置でそれぞれ前記出力面と前記溶着面とが互いに遠ざかる方向に前記移動側溶着具を案内するために、前記案内面を2つ有する、請求項1~6の何れか1項に記載の超音波溶着装置。
- 前記超音波ホーンは、超音波振動が入力される入力面を有する入力側端部と、前記スリットにより分岐しているとともに前記スリットの両側位置で超音波振動を出力する一対の出力面を有する出力側端部とを有する前記相手側溶着具であり、
前記超音波ホーンの入力面と前記超音波ホーンの各出力面との間の距離は、前記入力面に入力される超音波振動の半波長に相当する距離に設定され、
前記スリットは、前記超音波振動の節部に相当する位置又はこれよりも前記各出力面側の位置から前記出力側端部の端面までの範囲に形成されている、請求項1~7の何れか1項に記載の超音波溶着装置。 - 請求項1~8の何れか1項に記載の超音波溶着装置を用いて、着用者の腹部に配置される前腹部と、着用者の臀部に配置される後背部と、前記前腹部から着用者の両脚部の間を通って前記後背部まで延びる股下部とを有する使い捨ておむつを製造するための方法であって、
前記前腹部と前記後背部とが前記股下部を介して縦方向に連結された構成要素が横方向に連続する連続体を準備する準備工程と、
前記連続体を縦方向に二つ折りにする二つ折り工程と、
前記移動側溶着具を前記溶着範囲と前記非溶着範囲とに亘って移動させるとともに前記超音波ホーンに超音波振動を入力することにより、前記相手側溶着具の一対の端面と前記移動側溶着具の出力面又は溶着面との間で前記連続体における前記前腹部の側縁部に相当する部分と前記後背部の側縁部に相当する部分との重なり部分の2箇所を同時に溶着する溶着工程と、
前記溶着工程において形成された2箇所の溶着部の間で前記連続体を切断する切断工程とを含む、使い捨ておむつの製造方法。
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