WO2019003908A1 - 着用物品の伸縮積層体の製造装置および製造方法 - Google Patents

着用物品の伸縮積層体の製造装置および製造方法 Download PDF

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Publication number
WO2019003908A1
WO2019003908A1 PCT/JP2018/022518 JP2018022518W WO2019003908A1 WO 2019003908 A1 WO2019003908 A1 WO 2019003908A1 JP 2018022518 W JP2018022518 W JP 2018022518W WO 2019003908 A1 WO2019003908 A1 WO 2019003908A1
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WO
WIPO (PCT)
Prior art keywords
sheet
anvil roll
elastic member
sheets
pair
Prior art date
Application number
PCT/JP2018/022518
Other languages
English (en)
French (fr)
Inventor
美和 腰島
中村　秀幸
Original Assignee
株式会社瑞光
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社瑞光 filed Critical 株式会社瑞光
Priority to BR112019025368-8A priority Critical patent/BR112019025368A2/pt
Priority to US16/614,736 priority patent/US11191676B2/en
Priority to MX2019013401A priority patent/MX2019013401A/es
Priority to KR1020197032883A priority patent/KR102475149B1/ko
Priority to CN201880033468.7A priority patent/CN110650715B/zh
Priority to EP18823118.7A priority patent/EP3646830A4/en
Priority to JP2019526782A priority patent/JP7077318B2/ja
Publication of WO2019003908A1 publication Critical patent/WO2019003908A1/ja

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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
    • A61F13/15707—Mechanical treatment, e.g. notching, twisting, compressing, shaping
    • A61F13/15731—Treating webs, e.g. for giving them a fibrelike appearance, e.g. by embossing
    • 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
    • B29C66/40—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
    • A—HUMAN NECESSITIES
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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
    • A61F13/15593—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers having elastic ribbons fixed thereto; Devices for applying the ribbons
    • 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
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    • A—HUMAN NECESSITIES
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    • A61F13/00—Bandages or dressings; Absorbent pads
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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
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    • A—HUMAN NECESSITIES
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    • A61F13/00—Bandages or dressings; Absorbent pads
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    • A—HUMAN NECESSITIES
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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
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    • A—HUMAN NECESSITIES
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    • 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
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • 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
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/4902—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/086—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using a rotary anvil
    • 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
    • B29C66/11—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
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/05—Particular design of joint configurations
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    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • 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
    • B29C66/70—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
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B29C66/814—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
    • 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
    • B29C66/81433—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 being toothed, i.e. comprising several teeth or pins, or being patterned
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    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—Elastic
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    • B32B2555/00—Personal care
    • B32B2555/02—Diapers or napkins

Definitions

  • the present invention relates to the production of stretch laminates of worn articles.
  • a plurality of elastic members are disposed between two sheets, and the two sheets are joined to each other intermittently in both the expansion and contraction directions of the elastic members and in the cross direction thereof, thereby forming an elastic laminate. Is formed.
  • Both sheets are joined by passing both sheets between the anvil roll which has a convex part, and a sonic horn etc. (heating / pressurization means) which opposes this.
  • the elastic member is accommodated in the conveyance groove provided in the protrusion.
  • the projection for joining is formed with a height of, for example, 100 ⁇ m or more so that the elastic member at the time of extension can be accommodated in the conveyance groove.
  • the sheet wound around the anvil roll may be inadvertently displaced in the axial direction of the anvil roll as it is contracted in the radial direction of the anvil roll by the tension of conveyance. If the elastic member is displaced together with the sheet due to the displacement of the sheet, the elastic member may come out of the conveying groove, and the elastic member may be broken by the pressing force at the time of joining.
  • the object of the present invention is to prevent the elastic member from being detached from the conveying groove and being cut when joining both sheets on an anvil roll provided with projections intermittently in the axial direction, It is an object of the present invention to provide a method and apparatus for producing a stretch laminate.
  • the apparatus comprises an anvil roll 50 for conveying the pair of sheets 1 and 2 and the elastic member F such that the elastic member F is sandwiched between the first and second sheets 1 and 2; And a fusion device 70 for fusing the pair of sheets 1 and 2 together in cooperation with the anvil roll 50 and holding the elastic member F with the pair of sheets.
  • a first protrusion 52H for generating the first joint portion 31 in which the pair of sheets 1 and 2 are joined to each other is along the width direction S of the anvil roll 50.
  • Each of the first protrusions 52H extends in the circumferential direction R of the anvil roll 50, and defines and includes a transport groove G for transporting the elastic member F in a state in which the elastic member F enters.
  • the pair of sheets 1 between one first protrusion 52H adjacent to each other in the width direction S and another first protrusion 52H. , 2 are disposed at least one receiving portion 52L.
  • the manufacturing method comprises the following steps. That is, the method includes the step of introducing the first sheet 1 onto the anvil roll 50, The elastic member F is introduced onto the first sheet 1 on the anvil roll 50, and the elastic members F are inserted into the respective conveyance grooves G of the plurality of conveyance grooves G of the anvil roll 50.
  • the transport groove G included in the first protrusion 52H is such that at least one transport groove G with respect to one first protrusion 52H is a protrusion surface of the one first protrusion 52H in the width direction. It is provided to be divided into S. That is, each conveyance groove G is, for example, a V-shaped or U-shaped notch, and is defined by the surface of the notch formed in the first protrusion 52H at the center of the first protrusion 52H in the width direction S. Be done.
  • the depth of the conveyance groove G may be a depth to the extent that the pair of sheets 1 and 2 and the elastic member F between them are fused to each other, or a depth to the extent that they are not fused to each other It may be When the pair of sheets 1 and 2 and the elastic member F are fused to each other in the conveyance groove G, the bottom surface of the conveyance groove G is defined by the first protrusion 52H. That is, in this case, the conveyance groove G is surrounded by the first protrusion 52H on both sides and the lower side in the width direction S. A plurality of transport grooves G may be provided for one first protrusion 52H.
  • the pair of sheets are joined to each other by the fusion bonding structure. That is, in the pair of first protrusions 52H on at least both sides of each conveyance groove G, the pair of sheets are bonded to each other by the fusion bonding structure, and the stretchable laminate in which the elastic member F is sandwiched between the pair of sheets is generated.
  • the sheet On the anvil roll, the sheet is received by the receiving portion between the bonding projections. Therefore, displacement of the sheet and the elastic member F in the axial direction (width direction) of the anvil roll is suppressed. As a result, the elastic member is prevented from coming out of the conveyance groove, and breakage of the elastic member will be prevented at the time of bonding.
  • FIG. 1 is a plan view showing an expanded example of a wearing article to which the present invention is applied.
  • FIG. 2A is an enlarged plan view of a portion A (stretchable laminate) according to Example 1.
  • FIG. 2B is an enlarged cross-sectional view of the stretchable laminate of Example 1.
  • Fig.3 (a) is sectional drawing of an elastic strand
  • FIG.3 (b) is sectional drawing of a pair of sheet
  • FIG. 4A is a layout view showing the manufacturing apparatus of the present invention
  • FIG. 4B is a conceptual view enlarging a portion B
  • FIG. 4C is a side view enlarging a portion C.
  • FIG. 4A is a layout view showing the manufacturing apparatus of the present invention
  • FIG. 4B is a conceptual view enlarging a portion B
  • FIG. 4C is a side view enlarging a portion C.
  • FIG. 5 is a schematic perspective view of the anvil roll as viewed from the introduction device side.
  • FIG. 6 is a schematic perspective view of the anvil roll as viewed from below.
  • FIG. 7 is an enlarged perspective view showing a part of the anvil roll.
  • FIG. 8A, FIG. 8B and FIG. 8C are the developed top view, longitudinal cross-sectional view, and cross-sectional view which show a protrusion respectively.
  • FIG. 9 is an enlarged cross-sectional view of the horn and the anvil roll taken along the ridges of the anvil roll.
  • 10 (a) and 10 (b) are perspective views showing other examples of the ridge
  • FIG. 10 (c) is a plan view showing still another example of the ridge
  • FIG. 10 (d) is a top view. It is the dd sectional view taken on the line of (c).
  • part of the nonwoven fabric sheet was shown in gray in FIG.
  • the joints in FIG. 2A are hatched.
  • the protruding surfaces of the first and second protrusions are hatched.
  • At least two of the receiving portions 52L are provided between the one first protrusion 52H and the another first protrusion 52H, Between the at least two receiving portions 52L, a second protrusion 52S for producing a second joint portion 32 in which the pair of sheets 1 and 2 are joined to each other is provided.
  • the height of the receiving portion 52L is 51 to 300 ⁇ m lower than the height of the first protrusion 52H. If the height of the receiving portion 52L is too low compared to the first protrusion 52H, the first sheet will shrink in the radial direction of the anvil roll 50 together with the elastic member F until the receiving portion 52L receives the first sheet. The elastic member F is easily displaced in the axial direction of the anvil roll 50. On the other hand, when the height of the receiving part 52L approaches to the same extent as the first protrusion 52H, the pair of sheets easily fuses to each other in the receiving part 52L, though depending on the thickness and the type of the sheet, It will be done.
  • the height of the receiving part 52L is preferably 60 to 300 ⁇ m lower than the height of the first projection 52H, more preferably 70 to 300 ⁇ m lower, still more preferably 70 to 250 ⁇ m lower, 200 ⁇ m lower would be most preferable.
  • the difference in height may be about 20 to 300 ⁇ m.
  • the wearing article 90 comprises an absorbent main body 92 and a pair of front and rear waistline members 91, 91.
  • the absorbent main body 92 is bridged between the pair of waist members 91, 91 to form a crotch portion 92a.
  • the present wearing article 90 is worn in a state where the crotch portion 92a is folded in two along an imaginary line parallel to the waistline direction X. Thereby, the ends of the pair of waist members 91, 91 in the waist direction X overlap each other.
  • the front and rear waistline members 91 include the stretchable laminate 10 shown in FIGS. 2A and 2B.
  • the stretchable laminate 10 is a sheet-like member in which an elastic member F and first and second sheets 1 and 2 are laminated to each other.
  • the first sheet 1 and the second sheet 2 are made of non-woven fabric having air permeability.
  • the elastic member F is sandwiched between the first sheet 1 and the second sheet 2 and expands and contracts in the waist direction X.
  • the stretchable laminate 10 of the worn article 90 has a skin surface 11 (FIG. 2B) in contact with the skin of the wearer and a non-skin surface 12 on the opposite side.
  • the first surfaces 1f and 2f of the pair of sheets 1 and 2 face or contact each other.
  • the plurality of elastic members F are disposed between the first surfaces 1f and 2f of the pair of sheets 1 and 2 and are disposed apart from each other as indicated by the broken line in FIG. 2A.
  • the pair of sheets 1 and 2 are bonded to each other by fusion bonding at a plurality of bonding portions 3 without using an adhesive.
  • the pair of sheets 1 and 2 are fusion-bonded to the elastic member F in the fixing portion 3 f (fusion structure), so that each elastic member F is the pair of sheets in the fixing portion 3 f It is fixed to 1 and 2.
  • Each of the joint portions 3 is configured by fusing the pair of sheets 1 and 2 to each other on the first surfaces 1 f and 2 f of the pair of sheets 1 and 2 of FIG. 2B.
  • the bonding portion 3 extends in a direction Dp (for example, orthogonally intersected) with the elastic direction Df of the elastic member F in FIG. 2A, and is separated from each other in the elastic direction Df.
  • each of the bonding portions 3 has a plurality of pairs of first bonding portions 31, a second bonding portion 32, and a fixing portion 3f.
  • a non-joining portion 33 in which the pair of sheets 1 and 2 are non-joining is provided between the first joining portion 31 and the second joining portion 32.
  • the elastic member F may be linear or cord-like.
  • the elastic member F may be a multi-strand which several thread rubber (fibrous elastic body) F1 gathered in bundle shape.
  • thread rubber F1 As a material of thread rubber F1, polyurethane is mentioned, for example.
  • the stretchable laminate 10 forms a large number of folds P in a state in which the elastic member F is contracted.
  • the stretchable laminate 10 in a contracted state of the elastic member F will be described.
  • the sheets 1 and 2 may be, for example, a thermoplastic non-woven fabric in which a large number of thermoplastic fibers are laminated.
  • the pair of sheets 1 and 2 is formed so as to protrude in the direction Dp as shown in FIG. 4B in a state in which the elastic member F of FIG.
  • first and second bonding portions 31 and 32 are hatched.
  • the pair of first bonding portions 31 are disposed on both sides of the intersecting direction Dp of the elastic members F.
  • the second bonding portion 32 is a pair of first bonding portions 31 and another pair of second members adjacent to the intersecting direction Dp between the elastic members F adjacent to each other among the respective elastic members F. It is disposed between the first joint 31 and the first joint 31.
  • one second bonding portion 32 is provided between the pair of first bonding portions 31 and another pair of first bonding portions 31.
  • the bonding strength of the pair of sheets 1 and 2 in the second bonding portion 32 may be smaller or larger than the bonding strength of the pair of sheets 1 and 2 in the first bonding portion 31. .
  • the fixing portion 3f indicated by a blank between the pair of first bonding portions 31 may have weaker or stronger bonding force than the first bonding portion 31.
  • the fixing portion 3 f may have weaker or stronger bonding strength than the second bonding portion 32. This is because the elastic member F only needs to be fixed to the sheets 1 and 2.
  • each of the sheets 1 and 2 may be fused to the elastic member F, or may be fixed in a state where some or all of the non-woven fibers are entangled in the elastic member F. May be
  • the junctions 31 and 32 are intermittently provided in the intersecting direction Dp. Therefore, the non-joining part 33 which the 1st and 2nd sheet
  • the manufacturing apparatus of FIG. 4A includes an anvil roll 50, an introducing device 60, a fusion device 70, and the like.
  • the introduction device 60 guides the elastic member F to the anvil roll 50 while guiding it. Further, the first sheet 1 is introduced to the anvil roll 50 upstream of the elastic member F, and the second sheet 2 is introduced downstream of the elastic member F.
  • the anvil roll 50 conveys the pair of sheets 1 and 2 and the elastic member F such that the elastic member F is disposed between the pair of sheets 1 and 2.
  • the fusion device 70 cooperates with the anvil roll 50 to fuse the pair of sheets 1 and 2 to each other and the pair of sheets 1 and 2 to the elastic member F to fuse the pair of sheets 1 , 2 hold the elastic member F.
  • the fusion device 70 is an ultrasonic welding device which performs the fusion using ultrasonic energy.
  • the fusion device 70 applies vibrational energy at a plurality of bonding portions 3 (FIG. 2A) of the two nonwoven sheets 1 and 2 in the stretchable laminate 10 of FIG. 2B to form the two nonwoven sheets 1 and 2. 2 and the elastic member F are fused.
  • the anvil roll 50 of FIG. 5 has a large number of ridges 52 on the outer circumferential surface 51.
  • the ridges 52 extend in the width direction S of the anvil roll 50. That is, the ridges 52 extend along generatrix parallel to the axial direction of the anvil roll 50.
  • the plurality of protrusions 52 are provided separately from each other in the circumferential direction R of the anvil roll 50, and the protrusions 52 adjacent to each other among the plurality of protrusions 52 are in the width direction S An extending recessed groove 59 is defined.
  • the plurality of first protrusions 52H each including the transport groove G are intermittently provided in the width direction S on each of the protrusions 52.
  • the first protrusions 52H are provided in a matrix in the circumferential direction R and the width direction S of the roll 50, and the conveyance is performed.
  • Grooves G are provided in a matrix in the circumferential direction R and the width direction S of the roll 50.
  • the fusion device 70 of FIG. 4A has a horn 71.
  • the horn 71 is provided with ultrasonic energy, and faces the ridges 52 of FIG. 4C via the pair of sheets 1 and 2 and the elastic member F.
  • the width W1 of the horn 71 along the flow direction of the sheets 1 and 2 may be larger than the width W2 of the protrusion 52.
  • the plurality of protrusions 52 may be set to simultaneously or constantly face the horn 71 at the same time.
  • the anvil roll 50 has a plurality of transport grooves G.
  • Each conveying groove G is formed of a V-shaped or U-shaped notch formed in each of the ridges 52 of the plurality of ridges 52, and the circumferential direction of the anvil roll 50 is made to cross the respective ridges 52.
  • Extending to R the elastic member F is transported in a state in which the elastic member F enters.
  • the conveying groove G is recessed toward the radial center of the anvil roll 50.
  • the size of the conveying groove G may be set such that a part of the elastic member F is accommodated in the groove and the remaining part is released from the groove.
  • the cross-sectional area of the conveyance groove G may be smaller than the cross-sectional area of the elastic member F having a natural length.
  • the sheets 1 and 2 are not shown in FIGS. 5 to 8C, the sheets 1 and 2 are disposed so as to sandwich the elastic member F, as schematically shown in FIG.
  • the introduction device 60 of FIG. 4A includes a first roll (prescribed roll) 61 and a second roll (guide roll) 62.
  • the first and second rolls 61 and 62 of FIG. 5 may have a plurality of first and second guide grooves G1 and G2, respectively.
  • Each of the first guide grooves G1 winds the elastic member F and guides the elastic member F.
  • the elastic members F drawn from the first guide grooves G1 of the first roll 61 are wound around the second guide grooves G2 of FIG. 6, and the elastic members F are wound around the conveying grooves of the anvil roll 50. Guide to G.
  • the first and second rolls 61 and 62 may be free rollers, or may be rotationally driven in synchronization with the anvil roll 50. Also, the first and second rolls may not be provided.
  • each of the protrusions 52 has a plurality of the transfer grooves G, a receiving portion 52L, and protrusions 52H and 52S. That is, each protrusion 52 has a plurality of first protrusions 52 H for producing the first bonding portion 31 and a plurality of second protrusions 52 S for producing the second bonding portion 32 and a non-bonding portion And a receiving part 52L for forming the part 33.
  • the heights of the protrusions 52L and 52H and the depths of the transport grooves G are exaggerated in FIGS. 7, 8B, 8C and 9.
  • the first and second protrusions 52H, 52S and the receiving portion 52L are provided intermittently along the width direction S of the anvil roll 50, that is, in a state of being separated in the width direction S. .
  • the height (height from the surface of the concave groove 59) H1 of the receiving portion 52L in FIG. 8B is lower than the highest height H2 of the first and second protrusions 52H and 52S.
  • the height H1 of the receiving portion 52L is, for example, 70 to 200 ⁇ m lower than the height (height from the surface of the recessed groove 59) H2 of the protrusion 52H.
  • the transfer groove G is defined by a notch formed in the first protrusion 52H.
  • the lowermost surface of the notch of the first protrusion 52H is set to a height protruding in the radial direction of the roll 50 than the bottom surface of the concave groove 59 indicated by a broken line.
  • the surface of the receiving portion 52L is set to a height protruding in the radial direction from the lowermost surface of the notch and to a height retracted in the radial direction from the protruding surface of the first protrusion 52H. ing.
  • the transfer groove G is defined by (a pair of) portions on both sides of the first protrusion 52H in the width direction S and a portion of the first protrusion 52H below the transfer groove G. That is, the portion of the first protrusion 52H on both sides and the portion of the first protrusion 52H below define the bottom surface of the transport groove G. For example, as shown in FIG. 8B, a portion of the first protrusion 52H is scraped off in a V-shape, and the conveyance groove G is surrounded by the first protrusion 52H on both sides and the lower side in the width direction S. Is formed.
  • a plurality of sets of the pair of first protrusions 52 ⁇ / b> H are arranged in each of the width direction S and the circumferential direction R of the anvil roll 50. Between the pair of first protrusions 52H adjacent to each other in the width direction S and another pair of first protrusions 52H, at least one receiving portion 52L configured to receive the pair of sheets 1 and 2 is disposed ing.
  • two receiving portions 52L are provided between the pair of first protrusions 52H and the other first protrusions 52H. Between the two receiving portions 52L, a second protrusion 52S is provided for generating a second joint 32 (FIG. 2A) for joining the pair of sheets 1 and 2 to each other.
  • the first sheet 1 is introduced to the upstream portion of the anvil roll 50.
  • a plurality of elastic members F are introduced from the introducing device 60 onto the first sheet 1 of the anvil roll 50 into which the first sheet 1 has been introduced.
  • the respective elastic members F are introduced into the respective conveyance grooves G of FIG. 4C in a state of being entered together with the first sheet (FIG. 4A).
  • a pair of first protrusions 52H that generate the pair of first bonding portions 31, 31 and The first sheet 1 and the elastic member F are conveyed while receiving the first sheet 1 in the receiving portion 52L between another pair of first protrusions 52H as indicated by a two-dot chain line. .
  • the second sheet 2 of FIG. 4A is introduced to the portion of the anvil roll 50 facing the horn 71 of FIG. 4C. That is, on the anvil roll 50, the second sheet 2 is introduced onto the first sheet 1 so as to sandwich the elastic member F between the first sheet 1 and the second sheet 2.
  • the horn 71 ultrasonically vibrates in the direction toward the anvil roll 50.
  • the sheets 1 and 2 are fused to each other in the first bonding portion 31 and the second bonding portion 32 of FIG. 2A, and the sheets 1 and 2 are fused to the elastic member F in the fixing portion 3f.
  • the stretchable laminate 10 is produced.
  • first sheet 1 and the second sheet 2 are the anvil roll 50 without the first sheet 1 and the second sheet 2 being fused in the receiving portion 52L of FIGS. 7 and 8B.
  • the bonding portions 3 are formed by fusion bonding on the respective protrusions 52H and 52S.
  • the pair of sheets 1 and 2 pass between the first protrusion 52H or the second protrusion 52S of the protrusion 52 and the horn 71 in a direction perpendicular to the paper surface.
  • each of the protrusions 52H and 52S in FIG. 9 the horn 71 contacts the second sheet 2 with a large pressure. Therefore, each of the protrusions 52H and 52S intermittently generates the first and second bonding portions 31 and 32 of FIG. 2A in which the pair of sheets 1 and 2 are firmly ultrasonically welded in the stretching direction Df of the elastic member F. .
  • the first and second sheets 1 and 2 try to shrink in the radial direction of the anvil roll 50 in the receiving portion 52L as illustrated by the two-dot chain line in FIG. 9, the first sheet is formed on the surface of the receiving portion 52L. 1 is received. Therefore, the respective sheets 1 and 2 are unlikely to be misaligned in the width direction S. As a result, the elastic member F does not protrude from the transport groove G (does not protrude between the projecting surface of the first protrusion 52H to which a large pressure is applied and the horn 71), and hence the elastic member F is not cut off. , Sheets can be fused together.
  • FIG. 10 shows a modification.
  • the shape of the receiving portion 52L may be a circle or the like other than a square.
  • the receiving part 52L may protrude in the circumferential direction rather than each 1st protrusion 52H, and may be short in the circumferential direction.
  • the receiving portion 52L may be continuous with the first protrusion 52H, or may be formed intermittently.
  • the surface 52f of the protrusion 52 between the first protrusion 52H and the receiving portion 52L and the first The protrusions 52H may be meandered (continuously in a zigzag shape).
  • the width of the receiving portion 52L may not be constant.
  • the transport groove G is intermittently provided in the first protrusion 52H in the direction in which the elastic member F extends. That is, the transfer groove G is provided along the extending direction of the elastic member F only at the portion where the first protrusion 52H and the elastic member F intersect.
  • the elastic member F is drawn by a two-dot chain line.
  • receiving part 52L may be the same height as the peripheral face of anvil roll 50. Moreover, although the effect with respect to the shift
  • the present invention can be applied to the production of stretch laminates that can be suitably used for disposable diapers and diapers.

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Abstract

一対のシートを互いに接合する接合部を生成するための第１突部がアンビルロールの幅方向に複数配置され、各第１突部は、アンビルロールの周方向に延び、弾性部材が入り込んだ状態で弾性部材を搬送する搬送溝を包含し、幅方向に互いに隣り合う１つの第１突部と別の第１突部との間に一対のシートを受け止める少なくとも１つの受止部が配置されている。

Description

着用物品の伸縮積層体の製造装置および製造方法
　本発明は着用物品の伸縮積層体の製造に関する。
　下記の先行技術では、２枚のシート間に複数本の弾性部材を配置し、弾性部材の伸縮方向及びその交差方向の両方向に間欠的に、２枚のシートが互いに接合されて、伸縮積層体が形成されている。
ＪＰ２００５－２１２４０５　Ａ（フロントページ）
　両シートは、突部を有するアンビルロールとこれに対向するソニックホーン等（加熱・加圧手段）との間に両シートを通過させることで接合される。接合時の圧力を軽減するため、弾性部材は突部に設けた搬送溝内に収容されている。
　上記接合用の突部は、伸張時の弾性部材を搬送溝内に収容できるように、例えば、１００μｍ以上の高さで形成される。
　しかし、アンビルロールに巻回されたシートは、搬送の張力で前記アンビルロールの径方向に縮まろうとして、前記アンビルロールの軸方向に不用意に変位する場合がある。シートの変位により、弾性部材がシートと共に変位すると、弾性部材が前記搬送溝から外れ、接合時の押圧力で弾性部材が破断してしまうおそれがある。
　本発明の目的は、軸方向に間欠的に突部を備えたアンビルロール上において両シートを互いに接合する場合に、弾性部材が搬送溝から外れて切断されることを抑制しながら、着用物品の伸縮積層体を製造する方法と装置を提供することである。
　本発明装置は、第１および第２シート１，２の間に弾性部材Ｆがサンドイッチされた状態となるように、前記一対のシート１，２および前記弾性部材Ｆを搬送するアンビルロール５０と、
　前記アンビルロール５０と協働して前記一対のシート１，２を互いに融着すると共に前記一対のシートで前記弾性部材Ｆを保持させる融着装置７０とを備え、
　前記アンビルロール５０の外周面５１には、前記一対のシート１，２が前記互いに接合された第１接合部３１を生成するための第１突部５２Ｈが前記アンビルロール５０の幅方向Ｓに沿って、かつ、幅方向Ｓに互いに離間した状態で複数配置され、
前記各第１突部５２Ｈは、前記アンビルロール５０の周方向Ｒに延び、前記弾性部材Ｆが入り込んだ状態で前記弾性部材Ｆを搬送する搬送溝Ｇを定義すると共に包含し、
　前記搬送溝Ｇを含む前記複数の前記第１突部５２Ｈのうち、前記幅方向Ｓに互いに隣り合う１つの第１突部５２Ｈと別の第１突部５２Ｈとの間に前記一対のシート１，２を受け止める少なくとも１つの受止部５２Ｌが配置されている。
　本発明の伸縮積層体の製造方法において、前記伸縮シート１０は第１および第２シート１，２の間に互いに離間した複数本の弾性部材Ｆがサンドイッチされ、前記弾性部材Ｆの伸縮方向Ｄｆおよび前記伸縮方向Ｄｆに交差する方向Ｄｐについて各々複数列の第１接合部３１において前記第１および第２シート１，２が互いに接合され、
　前記製造方法は以下の工程を備える。すなわち、本方法は
　前記第１シート１をアンビルロール５０上に導入する工程、
　前記アンビルロール５０上の前記第１シート１上に前記弾性部材Ｆを導入すると共に前記アンビルロール５０の複数の前記搬送溝Ｇの各搬送溝Ｇに前記弾性部材Ｆの各々が入り込むように前記弾性部材Ｆを導入する工程、
　前記第１シート１が前記アンビルロール５０の径方向に収縮するのを抑制するために、前記搬送溝Ｇを包含する１つの第１突部５２Ｈと別の第１突部５２Ｈとの間の受止部５２Ｌにおいて前記第１シート１を受け止めながら、前記第１シート１および前記弾性部材Ｆを搬送する工程、
　前記アンビルロール５０上において、前記第１シート１と第２シート２との間で前記弾性部材Ｆを挟むように前記第２シート２を前記第１シート１上に導入する工程、並びに、
　前記受止部５２Ｌにおいて前記第１シート１と第２シート２とが融着されることなく、第１シート１と前記第２シート２とを前記アンビルロール５０の前記第１突部５２Ｈ上で融着して前記第１接合部３１を形成する工程を備える。
　本発明において、第１突部５２Ｈに包含される搬送溝Ｇは、１つの第１突部５２Ｈに対し少なくとも１本の搬送溝Ｇが前記１つの第１突部５２Ｈの突出表面を前記幅方向Ｓに分けるように設けられている。すなわち、前記各搬送溝Ｇは例えばＶ字状やＵ字状のノッチであり、前記第１突部５２Ｈの前記幅方向Ｓの中央において前記第１突部５２Ｈに形成されたノッチの表面で定義される。
前記搬送溝Ｇの深さは前記一対のシート１，２と両者の間の前記弾性部材Ｆとが互いに融着される程度の深さであってもよいし、互いに融着されない程度の深さであってもよい。前記搬送溝Ｇにおいて前記一対のシート１，２と前記弾性部材Ｆとが互いに融着される場合、前記搬送溝Ｇの底面は前記第１突部５２Ｈで定義される。すなわち、この場合、前記搬送溝Ｇは前記幅方向Ｓの両側および下側において前記第１突部５２Ｈに囲まれている。
　なお、前記搬送溝Ｇは１つの第１突部５２Ｈに対し複数設けられてもよい。
　本発明によれば、各弾性部材の前記幅方向（前記交差する方向）の少なくとも両側の一対の接合部において、一対のシートが融着構造により互いに接合される。すなわち、各搬送溝Ｇの少なくとも両側の一対の第１突部５２Ｈにおいて一対のシートが融着構造により互いに接合され、一対のシート間に弾性部材Ｆが挟まれた伸縮積層体が生成される。
　アンビルロール上において、シートが接合用の突部間の受止部に受け止められる。そのため、シートおよび弾性部材Ｆがアンビルロールの軸方向（幅方向）に変位することが抑制される。この結果、弾性部材が搬送溝から外れることが抑制され、接合時に弾性部材の破断が防止されるだろう。
図１は本発明が適用される着用物品の一例を展開して示す平面図である。 図２Ａは実施例１にかかるＡ部（伸縮積層体）の拡大平面図、図２Ｂは同実施例１の伸縮積層体の拡大断面図である。 図３（ａ）は弾性ストランドの断面図、図３（ｂ）は融着前の状態を示す一対のシートの断面図である。 図４Ａは本発明の製造装置を示すレイアウト図、図４ＢはＢ部を拡大した概念図、図４ＣはＣ部を拡大した側面図である。 図５はアンビルロールを導入装置側から見た概略斜視図である。 図６はアンビルロールを下方から見た概略斜視図である。 図７はアンビルロールの一部を切り出して示す拡大した斜視図である。 図８Ａ、図８Ｂおよび図８Ｃは、それぞれ、突条を示す展開した平面図、縦断面図および横断面図である。 図９はアンビルロールの突条の部位で断面したホーンおよびアンビルロールの拡大断面図である。 図１０（ａ）および（ｂ）は、それぞれ、突条の他の例を示す斜視図、図１０（ｃ）は突条の更に他の例を示す平面図、図１０（ｄ）は図１０（ｃ）のｄ－ｄ線断面図である。
　図３において不織布シートの部位はグレーで示した。図２Ａにおいて接合部には斜線を付した。図８Ａにおいて第１および第２突部の突出表面には斜線を付した。
　好ましい発明装置においては、前記受止部５２Ｌが前記１つの第１突部５２Ｈと前記別の第１突部５２Ｈとの間に少なくとも２つ設けられ、
　前記少なくとも２つの受止部５２Ｌの間に、前記一対のシート１，２が互いに接合された第２接合部３２を生成するための第２突部５２Ｓが設けられている。
　好ましくは、前記受止部５２Ｌの高さは前記第１突部５２Ｈの高さに比べ５１～３００μｍ低いことを特徴とする。
　受止部５２Ｌの高さが第１突部５２Ｈに比べ低すぎると、第１シートを受止部５２Ｌで受け止めるまでに第１シートが弾性部材Ｆと共にアンビルロール５０の径方向に縮まろうとし、アンビルロール５０の軸方向に弾性部材Ｆが変位し易くなる。
　一方、受止部５２Ｌの高さが第１突部５２Ｈと同程度まで近づくと、シートの厚さや種類にもよるが、受止部５２Ｌにおいて一対のシートが互いに融着し易くなり、互いに接合されてしまう。
　かかる観点から、受止部５２Ｌの高さは第１突部５２Ｈの高さに比べ６０～３００μｍ低いのが好ましく、７０～３００μｍ低いのがより好ましく、７０～２５０μｍ低いのが更に好ましく、７０～２００μｍ低いのが最も好ましいだろう。
　但し、一対のシートの種類や厚さによっては、前記高さの差は２０～３００μｍ程度であってもよいだろう。
　１つの前記各実施態様または下記の実施例に関連して説明および／または図示した特徴は、１つまたはそれ以上の他の実施態様または他の実施例において同一または類似な形で、および／または他の実施態様または実施例の特徴と組み合わせて、または、その代わりに利用することができる。
　本発明は、添付の図面を参考にした以下の好適な実施例の説明からより明瞭に理解されるであろう。しかし、実施例および図面は単なる図示および説明のためのものであり、本発明の範囲を定めるために利用されるべきものではない。本発明の範囲は請求の範囲によってのみ定まる。添付図面において、複数の図面における同一の部品番号は、同一または相当部分を示す。
　伸縮積層体の実施例の説明に先立って、伸縮積層体が用いられた使い捨て着用物品の構造の一例が説明される。
　着用物品を展開して示す図１において、着用物品９０は吸収性本体９２および前後の一対の胴回り部材９１，９１を備える。吸収性本体９２は一対の胴回り部材９１，９１に架設され股部９２ａを形成する。
　本着用物品９０は、前記股部９２ａが前記胴回り方向Ｘに平行な仮想のライン（ｌｉｎｅ）において２つに折られた状態で着用される。これにより、前記一対の胴回り部材９１，９１の胴回り方向Ｘの端部同士が互いに重なる。
　前記前後の各胴回り部材９１は、図２Ａおよび図２Ｂに明示する伸縮積層体１０を包含する。前記伸縮積層体１０は、それぞれ、弾性部材Ｆ、第１および第２シート１，２が互いに積層されたシート状の部材である。
　前記第１シート１および第２シート２は、通気性を有する不織布で構成されている。前記弾性部材Ｆは、前記第１シート１と第２シート２との間に挟まれており、前記胴回り方向Ｘに伸縮する。
　前記着用物品９０（図１）の伸縮積層体１０は着用者の肌に接する肌面１１（図２Ｂ）と、その反対側の非肌面１２とを有する。
　つぎに、前記伸縮積層体１０の一例が説明される。
　まず、弾性部材Ｆが伸張した状態について説明する。
　図２Ｂのように、前記一対のシート１，２は第１面１ｆ，２ｆ同士が互いに対面ないし接する。複数本の前記各弾性部材Ｆは前記一対のシート１，２の前記第１面１ｆ，２ｆの間に配置され、かつ、図２Ａの破線で示すように互いに離間して配置されている。
　図２Ａおよび図２Ｂのように、前記一対のシート１，２同士は複数の接合部３において、接着剤を介することなく、互いに融着により接合されている。本例の場合、固定部３ｆにおいて前記一対のシート１，２が前記弾性部材Ｆに融着されている（融着構造）ことで、前記各弾性部材Ｆは前記固定部３ｆにおいて前記一対のシート１，２に固定されている。
　前記各接合部３は図２Ｂの前記一対のシート１，２の第１面１ｆ，２ｆにおいて前記一対のシート１，２が互いに融着されていることで構成されている。前記接合部３は図２Ａの前記弾性部材Ｆの伸縮方向Ｄｆに交差する（例えば直交する）方向Ｄｐに延び、前記伸縮方向Ｄｆに互いに離間している。
　図２Ａにおいて、前記各接合部３は複数の一対の第１接合部３１、第２接合部３２および固定部３ｆを有する。第１接合部３１と第２接合部３２との間には一対のシート１，２が互いに非接合の非接合部３３が設けられている。
　弾性部材Ｆは、線状または索状であってもよい。例えば、図３（ａ）に示すように、弾性部材Ｆは、複数の糸ゴム（繊維状弾性体）Ｆ１が束状に集合したマルチストランドであってもよい。糸ゴムＦ１の材質としては、例えば、ポリウレタンが挙げられる。
　前記弾性部材Ｆの収縮力により図４Ｂに示すように、前記伸縮積層体１０は前記弾性部材Ｆが収縮した状態で、多数の襞Ｐを形成する。以下、弾性部材Ｆの収縮した状態の伸縮積層体１０について説明する。
　前記シート１，２は、例えば多数の熱可塑性の繊維が積層された熱可塑性の不織布であってもよい。図４Ｂの襞Ｐは、図２Ａの前記弾性部材Ｆが収縮している状態において、前記一対のシート１，２が図４Ｂのように方向Ｄｐに突出して形成されている。
　図２Ａにおいて、前記第１および第２接合部３１,３２には斜線が施されている。前記一対の第１接合部３１は前記各弾性部材Ｆの、前記交差する方向Ｄｐの両側に配置されている。
　前記第２接合部３２は、前記各弾性部材Ｆのうち互いに隣り合う弾性部材Ｆの間において、かつ、一対の第１接合部３１とこれと前記交差する方向Ｄｐに隣り合う別の一対の第１接合部３１との間に配置されている。本例では、一対の第１接合部３１と別の一対の第１接合部３１との間に１つの第２接合部３２が設けられている。
　前記第２接合部３２における前記一対のシート１，２同士の接合強度は、前記第１接合部３１における前記一対のシート１，２同士の接合強度よりも小さくてもよいし、大きくてもよい。
　図２Ａにおいて、一対の第１接合部３１の間においてブランクで示す固定部３ｆは、前記第１接合部３１よりも接合力が弱くてもよいし強くてもよい。また、固定部３ｆは前記第２接合部３２よりも接合力が弱くてもよいし強くてもよい。弾性部材Ｆをシート１，２に固定できればよいからである。
　図２Ａの前記固定部３ｆにおいて、各シート１，２は弾性部材Ｆに融着されていてもよいし、不織布の繊維の一部または全部が弾性部材Ｆに絡み付いたような状態で固定されていてもよい。
　図１の胴回り部材９１，９１の両端部またはその近傍において、前記弾性部材Ｆが図２Ｂの一対のシート１，２の間に固定される場合、図２Ａの前記固定部３ｆを必要としない。
　図２Ａにおいて、前記各接合部３１，３２は交差する方向Ｄｐに断続的に設けられている。したがって、互いに隣り合う各接合部３１，３２間には、第１および第２シート１，２が互いに接合されていない非接合部３３が断続的に設けられている。
　つぎに、前記伸縮積層体１０の製造装置の一例が説明される。
　図４Ａの製造装置はアンビルロール５０、導入装置６０および融着装置７０などを備える。
　前記導入装置６０はアンビルロール５０に弾性部材Ｆを案内しながら導入する。また、前記アンビルロール５０には前記弾性部材Ｆよりも上流において第１シート１が導入され、前記弾性部材Ｆよりも下流において第２シート２が導入される。前記アンビルロール５０は一対のシート１，２の間に前記弾性部材Ｆが配置された状態となるように、前記一対のシート１，２および弾性部材Ｆを搬送する。
　前記融着装置７０は前記アンビルロール５０と協働して前記一対のシート１，２を互いに融着すると共に前記一対のシート１，２を前記弾性部材Ｆに融着して前記一対のシート１，２で弾性部材Ｆを保持させる。本例の場合、融着装置７０は前記融着を超音波エネルギーで行う超音波溶着装置である。
　前記融着装置７０は、図２Ｂの前記伸縮積層体１０における前記２枚の不織布シート１，２の複数の接合部３（図２Ａ）において振動エネルギーを与えて、前記２枚の不織布シート１，２および弾性部材Ｆを融着する。
　より具体的には、図５の前記アンビルロール５０は多数の突条５２を外周面５１に有する。突条５２はアンビルロール５０の幅方向Ｓに延びる。すなわち、突条５２はアンビルロール５０の軸方向に平行な母線に沿って延びる。
　図７において、前記複数本の突条５２は前記アンビルロール５０の前記周方向Ｒに互いに離間して設けられ、前記複数本の突条５２のうち互いに隣り合う突条５２は前記幅方向Ｓに延びる凹溝５９を定義する。前記各突条５２には前記搬送溝Ｇを各々包含する前記複数の第１突部５２Ｈが前記幅方向Ｓに間欠的に設けられている。
このように、前記突条５２および前記凹溝５９が形成されていることで、前記第１突部５２Ｈが前記ロール５０の前記周方向Ｒおよび前記幅方向Ｓにマトリクス状に設けられ、前記搬送溝Ｇが前記ロール５０の前記周方向Ｒおよび前記幅方向Ｓにマトリクス状に設けられている。
　図４Ａの前記融着装置７０はホーン７１を有する。ホーン７１は超音波エネルギーが付与されるもので、前記一対のシート１，２および弾性部材Ｆを介して図４Ｃの突条５２に対向する。
　図４Ｃにおいて、前記シート１，２の流れ方向に沿った前記ホーン７１の幅Ｗ１は前記突条５２の幅Ｗ２よりも大きくてもよい。また、ホーン７１に対し、一時的に又は常時、複数本の突条５２が同時に対向するように設定されてもよい。
　図５および図６に示すように、前記アンビルロール５０は複数本の搬送溝Ｇを有する。各搬送溝Ｇは前記複数の突条５２の各突条５２に形成されたＶ字状ないしＵ字状のノッチで構成され、前記各突条５２を横断するように前記アンビルロール５０の周方向Ｒに延び、前記弾性部材Ｆが入り込んだ状態で前記弾性部材Ｆを搬送する。前記搬送溝Ｇはアンビルロール５０の径方向の中心に向かって凹んでいる。
　図９に示すように、前記搬送溝Ｇの大きさは、弾性部材Ｆの一部が溝内に収容され、残部が溝からハミ出るように設定されてもよい。搬送溝Ｇの断面積は自然長の弾性部材Ｆの断面積よりも小さくてもよい。
　なお、図５～図８Ｃにおいて、シート１，２は図示されていないが、図９に模式的に示すように、シート１，２は弾性部材Ｆを挟むように配置される。
　図４Ａの導入装置６０は、第１ロール（規定ロール）６１および第２ロール（案内ロール）６２を備える。図５の前記第１および第２ロール６１，６２は、各々、第１および第２案内溝Ｇ１、Ｇ２を複数本有していてもよい。各第１案内溝Ｇ１は、前記弾性部材Ｆが巻かれ前記各弾性部材Ｆを案内する。図６の前記第２案内溝Ｇ２は前記第１ロール６１の前記各第１案内溝Ｇ１から導出された前記各弾性部材Ｆが巻かれ、この弾性部材Ｆを前記アンビルロール５０の前記各搬送溝Ｇに案内する。
　前記第１および第２ロール６１，６２はフリーローラであってもよいし、前記アンビルロール５０に同期して回転駆動されてもよい。また、第１および第２ロールを設けなくてもよい。
　図７に明示するように、前記各突条５２は、複数の前記搬送溝Ｇ、受止部５２Ｌおよび突部５２Ｈ，５２Ｓを有する。すなわち、前記各突条５２は前記第１接合部３１を生成するための複数の第１突部５２Ｈと、前記第２接合部３２を生成するための複数の第２突部５２Ｓと非接合部３３を形成するための受止部５２Ｌとを包含する。なお、構造を理解し易くするために、図７、図８Ｂ、図８Ｃおよび図９において、各突部５２Ｌ，５２Ｈの高さや搬送溝Ｇの深さは誇張して図示されている。
　図７において、前記第１および第２突部５２Ｈ，５２Ｓおよび受止部５２Ｌは前記アンビルロール５０の幅方向Ｓに沿って間欠的に、つまり、幅方向Ｓに離間した状態で設けられている。
　図８Ｂの前記受止部５２Ｌの高さ（凹溝５９の表面からの高さ）Ｈ１は第１および第２突部５２Ｈ，５２Ｓの最も高い高さＨ２よりも低い。前記受止部５２Ｌの高さＨ１は前記突部５２Ｈの高さ（凹溝５９の表面からの高さ）Ｈ２に比べ、例えば７０～２００μｍ低い。
　図８Ｂにおいて、前記搬送溝Ｇは前記第１突部５２Ｈに形成されたノッチで定義されている。前記第１突部５２Ｈのノッチの最下面は、破線で示す前記凹溝５９の底面よりも前記ロール５０の径方向に突出した高さに設定されている。前記受止部５２Ｌの表面は前記ノッチの前記最下面よりも前記径方向に突出した高さで、かつ、前記第１突部５２Ｈの突出表面よりも前記径方向に退避した高さに設定されている。
　前記搬送溝Ｇは第１突部５２Ｈの前記幅方向Ｓの両側の（一対の）部位および前記搬送溝Ｇの下方の第１突部５２Ｈの部位で定義されている。すなわち、前記両側の第１突部５２Ｈの部位および下方の第１突部５２Ｈの部位は、搬送溝Ｇの底面を定義する。例えば、図８Ｂに示すように、第１突部５２Ｈの一部がＶ字状に削り取られて、前記幅方向Ｓの両側および下側において前記第１突部５２Ｈに囲まれるように搬送溝Ｇが形成されている。
　図７に示すように、前記一対の第１突部５２Ｈは前記アンビルロール５０の幅方向Ｓおよび周方向Ｒの各々に複数組配置されている。前記幅方向Ｓに互いに隣り合う前記一対の第１突部５２Ｈと別の一対の第１突部５２Ｈとの間に前記一対のシート１，２を受け止める少なくとも１つの前記受止部５２Ｌが配置されている。
　本例の場合、前記受止部５２Ｌが前記一対の第１突部５２Ｈと前記別の第１突部５２Ｈとの間に２つ設けられている。前記２つの受止部５２Ｌの間に、前記一対のシート１，２を互いに接合する第２接合部３２（図２Ａ）を生成するための第２突部５２Ｓが設けられている。
　つぎに、前記製造装置を用いた前記伸縮積層体１０の製造方法の一例が説明される。
　図４Ａに示すように、アンビルロール５０の上流部分に第１シート１が導入される。前記第１シート１が導入されたアンビルロール５０の第１シート１上には導入装置６０から複数の弾性部材Ｆが導入される。各弾性部材Ｆは図４Ｃの各搬送溝Ｇに第１シート（図４Ａ）と共に入り込んだ状態で導入される。
　前記第１シート１が前記アンビルロール５０の径方向に収縮するのを抑制するために、図９のように、前記一対の第１接合部３１，３１を生成する一対の第１突部５２Ｈと別の一対の第１突部５２Ｈとの間の受止部５２Ｌにおいて、二点鎖線で示すように、前記第１シート１を受け止めながら、前記第１シート１および前記弾性部材Ｆが搬送される。
　一方、図４Ｃの前記ホーン７１に対面するアンビルロール５０の部位には、図４Ａの第２シート２が導入される。すなわち、前記アンビルロール５０上において、前記第１シート１と第２シート２との間で前記弾性部材Ｆを挟むように前記第２シート２が前記第１シート１上に導入される。
　前記第１シート１、弾性部材Ｆおよび第２シート２がホーン７１と突条５２との間を通過する際に、前記ホーン７１がアンビルロール５０に向かう方向に超音波振動する。これにより、図２Ａの前記第１接合部３１および第２接合部３２においてシート１，２同士が互いに融着されると共に、固定部３ｆにおいてシート１，２が弾性部材Ｆに融着される。こうして、伸縮積層体１０が生成される。
　ここで、図７および図８Ｂの前記受止部５２Ｌにおいて前記第１シート１と第２シート２とが融着されることなく、第１シート１と前記第２シート２とが前記アンビルロール５０の各突部５２Ｈ，５２Ｓ上で融着されて前記接合部３が形成される。
　図９に拡大して示すように、一対のシート１，２は、前記突条５２の第１突部５２Ｈまたは第２突部５２Ｓとホーン７１との間を紙面に直交する方向に通過する。
　図９の各突部５２Ｈ，５２Ｓにおいては、ホーン７１が第２シート２に大きい圧力で接する。したがって、各突部５２Ｈ，５２Ｓは一対のシート１，２が強固に超音波溶着された図２Ａの第１および第２接合部３１，３２を弾性部材Ｆの伸縮方向Ｄｆに断続的に生成する。
　一方、図９において、受止部５２Ｌにおいては、ホーン７１と第２シート２との間には接触圧力が殆ど生じない。したがって、受止部５２Ｌでは超音波溶着が実行されない。
　また、図９の二点鎖線で例示するように、受止部５２Ｌにおいて第１および第２シート１，２がアンビルロール５０の径方向に縮まろうとすると、受止部５２Ｌの表面で第１シート１が受け止められる。そのため、各シート１，２が幅方向Ｓに位置ズレしにくい。その結果、弾性部材Ｆが搬送溝Ｇからはみ出すことなく（大きい圧力の加わる第１突部５２Ｈの突出表面とホーン７１との間にはみ出すことなく）、したがって、弾性部材Ｆが切断されることなく、シート同士を融着することができる。
　図１０は変形例を示す。
　図１０（ａ）のように、受止部５２Ｌの形状は方形以外の円形等であってもよい。また、受止部５２Ｌは各第１突部５２Ｈよりも周方向に突出していてもよいし周方向に短くてもよい。
　図１０（ｂ）のように、受止部５２Ｌは第１突部５２Ｈに連続していてもよく、あるいは、断続的に形成されていてもよい。
　図１０（ｃ）および（ｄ）の実施例のように、伸縮積層体１０の弾性部材Ｆに対し、第１突部５２Ｈと受止部５２Ｌとの間の突条５２の表面５２ｆと第１突部５２Ｈとが蛇行（ジグザグ状に連続）していてもよい。この場合、受止部５２Ｌの幅は一定でなくてもよい。この場合、搬送溝Ｇは弾性部材Ｆの延びる方向に間欠的に第１突部５２Ｈに設けられている。すなわち、第１突部５２Ｈと弾性部材Ｆとが交わる部位においてのみ弾性部材Ｆの延びる方向に沿って搬送溝Ｇが設けられている。なお、図１０（ｄ）において弾性部材Ｆは二点鎖線で描かれている。
　ところで、受止部５２Ｌは、アンビルロール５０の外周面とおよび同じ高さであってもよい。また、弾性部材のズレに対する効果は期待できないが、接合用の突部の周方向の間欠部分に受止部５２Ｌが形成されていてもよい。
　以上のとおり、図面を参照しながら好適な実施例を説明したが、当業者であれば本明細書を見て、自明な範囲で種々の変更および修正を容易に想定するであろう。
　たとえば、導入用のロールは必ずしも設ける必要はない。また、融着は超音波ではなく、熱シールであってもよい。
　したがって、そのような変更および修正は、請求の範囲から定まる本発明の範囲内のものと解釈される。
　本発明はオムツ型およびパンツ型の使い捨て着用物品に好適に用いることのできる伸縮積層体の製造に適用し得る。
　１，２：一対のシート　１０：伸縮積層体　１ｆ，２ｆ：第１面　
３：接合部　３ｆ：固定部　３１：第１接合部　３２：第２接合部　３３：非接合部
５０：アンビルロール　５１：外周面　
５２：突条　５２Ｈ：第１突部　５２Ｓ：第２突部　５２Ｌ：受止部　５９：凹溝
６０：導入装置　６１：第１ロール（規定ロール）　６２：第２ロール（案内ロール）
７０：融着装置　７１：ホーン　
Ｄｆ：伸縮方向　Ｄｐ：交差する方向　Ｆ：弾性部材
Ｇ：搬送溝　Ｇ１：第１案内溝　Ｇ２：第２案内溝
Ｈ１，Ｈ２：高さ　Ｓ：幅方向（軸方向）
Ｐ：襞　Ｗ１～Ｗ２：幅

Claims (6)

  1. 　着用物品の伸縮積層体の製造装置であって、
    　第１および第２シート１，２の間に弾性部材Ｆが挟まれた状態となるように、前記一対のシート１，２および前記弾性部材Ｆを搬送するアンビルロール５０と、
    　前記アンビルロール５０と協働して前記一対のシート１，２を互いに融着すると共に前記一対のシートで前記弾性部材Ｆを保持させる融着装置７０とを備え、
    　前記アンビルロール５０の外周面５１には、前記一対のシート１，２が前記互いに接合された第１接合部３１を生成するための第１突部５２Ｈが前記アンビルロール５０の幅方向Ｓに沿って、かつ、幅方向Ｓに互いに離間した状態で複数配置され、
    前記各第１突部５２Ｈは、前記アンビルロール５０の周方向Ｒに延び、前記弾性部材Ｆが入り込んだ状態で前記弾性部材Ｆを搬送する搬送溝Ｇを定義すると共に包含し、
    　前記搬送溝Ｇを含む前記複数の前記第１突部５２Ｈのうち、前記幅方向Ｓに互いに隣り合う１つの第１突部５２Ｈと別の第１突部５２Ｈとの間に前記一対のシート１，２を受け止める少なくとも１つの受止部５２Ｌが配置された、製造装置。
  2. 　請求項１において、
    　前記受止部５２Ｌが前記１つの第１突部５２Ｈと前記別の第１突部５２Ｈとの間に少なくとも２つ設けられ、
    　前記少なくとも２つの受止部５２Ｌの間に、前記一対のシート１，２が互いに接合された第２接合部３２を生成するための第２突部５２Ｓが設けられている、製造装置。
  3. 　請求項１もしくは２において、
    　前記受止部５２Ｌの高さは前記第１突部５２Ｈの高さに比べ５１～３００μｍ低いことを特徴とする、製造装置。
  4. 　請求項１において、
    　前記アンビルロール５０の外周面５１には、前記アンビルロール５０の前記幅方向Ｓに沿って延びる複数本の突条５２が前記アンビルロール５０の前記周方向Ｒに互いに離間して設けられ、
    　前記複数本の突条５２のうち互いに隣り合う突条５２は前記幅方向Ｓに延びる凹溝５９を定義し、
    　前記各突条５２には前記搬送溝Ｇを各々包含する前記複数の第１突部５２Ｈが前記幅方向Ｓに間欠的に設けられ、
    このように、前記突条５２および前記凹溝５９が形成されていることで、
    　前記第１突部５２Ｈが前記ロール５０の前記周方向Ｒおよび前記幅方向Ｓにマトリクス状に設けられ、
    　前記搬送溝Ｇが前記ロール５０の前記周方向Ｒおよび前記幅方向Ｓにマトリクス状に設けられている、製造装置。
  5. 　着用物品の伸縮積層体１０の製造方法であって、
    　前記伸縮シート１０は第１および第２シート１，２の間に互いに離間した複数本の弾性部材Ｆが挟まれ、前記弾性部材Ｆの伸縮方向Ｄｆおよび前記伸縮方向Ｄｆに交差する方向Ｄｐについて各々複数列の第１接合部３１において前記第１および第２シート１，２が互いに接合され、
    　前記製造方法は以下の工程を備える
    　前記第１シート１をアンビルロール５０上に導入する工程、
    　前記アンビルロール５０上の前記第１シート１上に前記弾性部材Ｆを導入すると共に前記アンビルロール５０の複数の前記搬送溝Ｇの各搬送溝Ｇに前記弾性部材Ｆの各々が入り込むように前記弾性部材Ｆを導入する工程、
    　前記第１シート１が前記アンビルロール５０の径方向に収縮するのを抑制するために、前記搬送溝Ｇを包含する１つの第１突部５２Ｈと別の第１突部５２Ｈとの間の受止部５２Ｌにおいて前記第１シート１を受け止めながら、前記第１シート１および前記弾性部材Ｆを搬送する工程、
    　前記アンビルロール５０上において、前記第１シート１と第２シート２との間で前記弾性部材Ｆを挟むように前記第２シート２を前記第１シート１上に導入する工程、並びに、
    　前記受止部５２Ｌにおいて前記第１シート１と第２シート２とが融着されることなく、第１シート１と前記第２シート２とを前記アンビルロール５０の前記第１突部５２Ｈ上で融着して前記第１接合部３１を形成する工程。
  6. 　請求項３の製造装置を用いた着用物品の伸縮積層体１０の製造方法であって、
    　前記伸縮積層体１０は前記第１および第２シート１，２の間に互いに離間した複数本の前記弾性部材Ｆが挟まれ、前記弾性部材Ｆの伸縮方向Ｄｆおよび前記伸縮方向Ｄｆに交差する方向Ｄｐについて各々複数列の前記第１接合部３１において前記第１および第２シート１，２が互いに接合され、
    　前記製造方法は以下の工程を備える
    　前記第１シート１を前記アンビルロール５０上に導入する工程、
    　前記アンビルロール５０上の前記第１シート１上に前記弾性部材Ｆを導入すると共に前記アンビルロール５０の複数の前記搬送溝Ｇの各搬送溝Ｇに前記弾性部材Ｆの各々が入り込むように前記弾性部材Ｆを導入する工程、
    　前記第１シート１が前記アンビルロール５０の径方向に収縮するのを抑制するために、前記搬送溝Ｇを包含する前記１つの第１突部５２Ｈと前記別の第１突部５２Ｈとの間の前記受止部５２Ｌにおいて前記第１シート１を受け止めながら、前記第１シート１および前記弾性部材Ｆを搬送する工程、
    　前記アンビルロール５０上において、前記第１シート１と前記第２シート２との間で前記弾性部材Ｆを挟むように前記第２シート２を前記第１シート１上に導入する工程、並びに、
    　前記受止部５２Ｌにおいて前記第１シート１と前記第２シート２とが融着されることなく、前記第１シート１と前記第２シート２とを前記アンビルロール５０の前記第１突部５２Ｈ上で融着して前記第１接合部３１を形成する工程。
PCT/JP2018/022518 2017-06-29 2018-06-13 着用物品の伸縮積層体の製造装置および製造方法 WO2019003908A1 (ja)

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US20200179180A1 (en) 2020-06-11
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