WO2018051835A1 - アンビル及び超音波シール装置 - Google Patents

アンビル及び超音波シール装置 Download PDF

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Publication number
WO2018051835A1
WO2018051835A1 PCT/JP2017/031842 JP2017031842W WO2018051835A1 WO 2018051835 A1 WO2018051835 A1 WO 2018051835A1 JP 2017031842 W JP2017031842 W JP 2017031842W WO 2018051835 A1 WO2018051835 A1 WO 2018051835A1
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WIPO (PCT)
Prior art keywords
welding
anvil
vibration
horns
pair
Prior art date
Application number
PCT/JP2017/031842
Other languages
English (en)
French (fr)
Inventor
柚原　徳崇
Original Assignee
凸版印刷株式会社
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Filing date
Publication date
Application filed by 凸版印刷株式会社 filed Critical 凸版印刷株式会社
Priority to CN201780056163.3A priority Critical patent/CN109689506B/zh
Publication of WO2018051835A1 publication Critical patent/WO2018051835A1/ja
Priority to US16/295,523 priority patent/US10683118B2/en

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    • 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
    • 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
    • B29C65/088—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using several cooperating sonotrodes, i.e. interacting with each other, e.g. for realising the same joint
    • 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
    • B29C65/74—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
    • B29C65/745—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 using a single unit having both a severing tool and a welding tool
    • B29C65/7451—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 using a single unit having both a severing tool and a welding tool the severing tool and the welding tool being movable with respect to one-another
    • 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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    • B29C66/00—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
    • B29C66/346—Making joints having variable thicknesses in the joint area, e.g. by using jaws having an adapted configuration
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • 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
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B29C66/723—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
    • B29C66/7232—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 non-plastics layer
    • B29C66/72327—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 non-plastics layer consisting of natural products or their composites, not provided for in B29C66/72321 - B29C66/72324
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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
    • B29C66/73—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
    • B29C66/737—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 state of the material of the parts to be joined
    • B29C66/7373—Joining soiled or oxidised materials
    • 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
    • B29C66/73—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
    • 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
    • B29C66/81—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
    • 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
    • B29C66/81427—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
    • 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
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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
    • B29C66/81431—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
    • 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
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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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • 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
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/849—Packaging machines
    • B29C66/8491—Packaging machines welding through a filled container, e.g. tube or bag
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
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    • B31B50/60—Uniting opposed surfaces or edges; Taping
    • B31B50/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding
    • B31B50/66—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding by high-frequency electric heating
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—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
    • 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
    • B29C66/81411—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81425—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being stepped, e.g. comprising a shoulder
    • 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
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7162—Boxes, cartons, cases
    • B29L2031/7166—Cartons of the fruit juice or milk type, i.e. containers of polygonal cross sections formed by folding blanks into a tubular body with end-closing or contents-supporting elements, e.g. gable type containers

Definitions

  • the present invention relates to an ultrasonic sealing apparatus for joining a laminated body in which two or more sheet bodies are superposed at a belt-like sealing position, and particularly constitutes a paper container that stores a liquid, a solid, or the like.
  • the present invention relates to a technique suitable for transversely sealing (ultrasonic sealing) a cylindrical laminated packaging material.
  • Liquid paper containers are widely used as simple containers for storing liquid drinks such as fruit drinks, tea, coffee, milk drinks, soups, and alcoholic beverages such as sake and shochu.
  • the liquid paper container include a roof shape, a brick shape, and a cylindrical shape.
  • a ruled line for the container is applied to a packaging material having a thermoplastic resin layer on the front and back surfaces of a paper layer, edge protection tape is attached to the end of the packaging material, and the packaging material is formed into a cylindrical shape.
  • a cylindrical packaging material is obtained.
  • this cylindrical packaging material is joined to a transverse direction, a lower end part is sealed (sealed), and it becomes the mouth of a container in the state which filled the contents in the cylindrical packaging material after that. After the position (upper end side) is sealed in liquid in the transverse direction and partitioned, it is formed into a three-dimensional shape to obtain the final shape of the container.
  • the sealing in the transverse direction with respect to the cylindrical packaging material is performed by, for example, an ultrasonic sealing device as described in Patent Document 1.
  • the sealing by the ultrasonic sealing device is performed by pressing the container sealing position with the front end surface of the opposing horn and the front end surface of the anvil to ultrasonically vibrate the horn, so that the packaging material interface (contact between the overlapping sheet bodies)
  • the thermoplastic resin present on the surface of the packaging material is melted and sealed by the heat generated at the surface position.
  • the sealing state of the liquid container is important, and the above-described seals need to be strong enough to protect the contents and withstand transportation / drop impact.
  • Japanese Patent No. 4093775 Japanese Patent No. 3904675 (FIG. 10)
  • a pair of horns each having a band-like vibration imparting surface formed on a tip surface thereof are provided so as to be aligned along the extending direction of the vibration imparting surface.
  • the laminated body in which two or more sheet bodies having a thermoplastic resin layer are stacked is sandwiched between the vibration imparting surface of the horn and the welded surface portion of the contact surface formed on the front end surface of the anvil.
  • the anvil in the ultrasonic sealing device for joining the laminate by melting the thermoplastic resin provided on the sheet body by the transmitted ultrasonic vibration The welding surface portion protrudes toward the horn and has left and right welding surfaces respectively disposed along the extending direction of the vibration applying surface so as to face the vibration applying surfaces formed on the pair of horns.
  • the left and right welding surfaces increase in a continuous or stepwise manner as the area per unit length along the extending direction increases from the seal center side that is adjacent to the vibration applying surface of the pair of horns. It is set so that it may become.
  • FIG. 1 It is a typical side view for explaining the ultrasonic sealing device concerning the embodiment based on the present invention.
  • the ultrasonic sealing device 1 includes an ultrasonic oscillator 9, a converter 2 which is an ultrasonic transducer, a pair of horns 3 (only one horn 3 is shown in FIG. 1), And anvil 4.
  • Reference numeral 5 denotes a jaw that supports the anvil 4.
  • Reference numeral 6 denotes a horn cover that protects the pair of horns 3 together.
  • the converter 2 is supplied with electric power from the ultrasonic oscillator 9 to generate ultrasonic vibrations and transmits the generated vibrations to the pair of horns 3, so that the tip of the horn 3 is ultrasonically vibrated.
  • the pair of horns 3 are supported by one converter 2 in a state where a predetermined gap (for example, a gap of 1 mm) is opened and arranged along the sealing direction. A configuration in which each converter is supported may be used.
  • the pair of horns 3 are supported by the converter 2 via the O-ring 40 at the position of the nodal point where the longitudinal amplitude becomes 0 (zero).
  • This embodiment is an example in which two upper and lower seals are simultaneously sealed. That is, this is an example in which the upper end opening of the preceding paper container and the lower end of the portion that becomes the subsequent paper container are sealed simultaneously.
  • tip part of each horn 3 branches into two forks, and the two vibration provision surfaces 3a are formed in the two front-end
  • Each vibration applying surface 3a has a strip shape (or strip shape), and the two vibration applying surfaces 3a extend in parallel to each other. Note that the two vibration imparting surfaces 3a extend in the direction perpendicular to the paper surface in FIG. That is, in FIG. 1, the pair of horns 3 are also arranged side by side in the direction orthogonal to the paper surface. A groove 3b is formed between the two vibration imparting surfaces 3a.
  • the front end surface of the anvil 4 constitutes a contact surface 4A facing the horn 3 side.
  • a predetermined load is applied from the thickness direction to the laminated body in which two or more sheet bodies are overlapped by the welding surface portion 10 formed on the contact surface 4A and the vibration applying surface 3a formed on the front end surface of the horn 3. Can be sandwiched between. That is, on the contact surface 4A, two welding surface portions 10 that protrude toward the vibration applying surfaces 3a are formed. Each of the welding surface portions 10 is opposed to the vibration applying surface 3a with the stacked sheet bodies interposed therebetween.
  • each welding surface portion 10 (the width facing the vibration applying surface 3a via the laminate) is set shorter than the width of the vibration applying surface 3a.
  • a plurality of rows of block bodies 11 are provided on the side of the belt-like welding surface portion 10. The row
  • the plurality of block bodies 11 may be present on both sides of each welding surface portion 10, but in this embodiment, the plurality of block bodies 11 are arranged on both sides of the two welding surface portions 10 therebetween. The case where it arrange
  • Each block body 11 is set so that its height is less than the height of the welding surface portion 10 or the top surface of the block body 11 is flush with the tip surface of the welding surface portion 10.
  • FIG. 3 illustrates a case where the vibration imparting surface 3a in the stationary state and the block body 11 do not overlap each other when viewed from the protruding direction of the block body 11 (the clamping direction by the horn 3 and the anvil 4).
  • the height of each block body 11 is preferably less than the height of the welding surface portion 10.
  • each of the plurality of block bodies 11 is set so as to be arranged along the extending direction of the welding surface portion 10.
  • the exterior resin layer 30b is formed on the surface side of the base material layer 30a made of paper, and the base material layer 30a.
  • a resin film 30c, a barrier layer 30d, and an interior resin layer 30e are formed in this order on the back surface side.
  • the resin constituting the exterior resin layer 30b, the resin film 30c, and the interior resin layer 30e can be exemplified by a polyethylene resin, but is not limited thereto.
  • at least the interior resin layer 30e is made of a thermoplastic resin.
  • the barrier layer 30d is composed of a vapor-deposited film or an aluminum thin plate deposited on the resin film 30c, and ensures a barrier property corresponding to the contents to be stored in the container.
  • Such a packaging material 30 is formed into a cylindrical packaging material 31 in which the ends are overlapped as shown in FIG. 6 with the interior resin layer 30e side facing inward.
  • the cylindrical packaging material 31 has a long cylindrical shape.
  • the bonded portion where the end portion 31a and the end portion 31b of the packaging material 30 overlapped when the cylindrical packaging material 31 is formed is described as an overlapping portion R.
  • the overlapping portion R extends along the axial direction of the long cylindrical packaging material 31.
  • the edge protection tape 32 is affixed to the overlapping portion R.
  • the edge protection tape 32 is affixed to the inner surface side of the cylindrical packaging material 31.
  • the cylindrical packaging material 31 has a flattened shape as shown in FIG. 6B, and the horn 3 and the anvil from the up and down direction in FIG. 6B.
  • the packaging material 30A, 30B constituting the sheet body is in a laminated body state in which two layers overlap each other.
  • the edge protection tape 32 is included, the sheet body is in a state where four layers are overlapped.
  • a concave portion 10 b corresponding to the stacking is formed in the longitudinal center portion of the welding surface portion 10 in contact with the overlapping portion. Yes.
  • the concave portion 10b becomes a seal central portion.
  • Each of the two welding surface portions 10 has left and right welding surfaces 10a disposed so as to extend from the concave portion 10b on the seal center side to the left and right.
  • the left and right welding surfaces 10a are continuous or stepped as the area per unit length along the extending direction increases from the concave portion 10b side (the seal center side adjacent to the two vibration applying surfaces 3a). It is set so as to be large.
  • the seal surface shape of the left and right welding surfaces 10a is such that the width increases continuously or stepwise as the distance from the seal center side increases.
  • the seal surface shape of the left and right welding surfaces 10a is a trapezoidal shape that continuously increases as the distance from the seal center side is illustrated.
  • the left and right welding surfaces 10a may have a stepped width (see FIG. 7 (a)), and the profiles on both sides in the width direction are not limited to a straight line. Further, it may be a curved profile whose width is continuously widened (see FIG. 7B).
  • each welding surface 10a is designed to be a straight line in which the profiles 10x on the side of the plurality of block bodies 11 are equally spaced from the row of the plurality of adjacent block bodies 11. .
  • the present invention is not limited to this.
  • the melting amount of the thermoplastic resin generated when sealing is relatively increased. Therefore, at this position, the separation distance from the welding surface portion 10 of the block body 11 is set to the other position. It is preferable that the distance is set wider than the separation distance A.
  • the gap between adjacent block bodies 11 is set to, for example, 0.1 mm or more and 2 mm or less. If the gap is less than 0.1 mm, it is difficult to form a gap enough to allow air to escape between the sheet bodies. On the other hand, if the gap exceeds 2 mm, the molten resin may move outward.
  • channel which comprises the knife slit 15 in which the cutting blade 7 advances / retreats is arrange
  • the cutting blade 7 is provided so as to be able to advance and retreat toward the horn 3 side, and is used for cutting between two sealing positions to separate the preceding and succeeding paper containers.
  • FIG. 1 shows a state before the lower end of the next container is sealed at the same time as the mouth (upper end) of a brick-type liquid paper container that has been sealed at the lower end of the container and filled with liquid therein. ing. From the state of FIG. 1, the cylindrical packaging material 31 is sandwiched between the vibration imparting surfaces 3 a of the pair of horns 3 and the contact surface 4 A of the anvil 4 from both sides with a predetermined load, and the cylindrical packaging material 31 is crushed and sheeted In the state of the laminated body in which the bodies are laminated, the vibration applying surface 3a of the horn 3 is ultrasonically vibrated to melt the interior resin layer 30e and seal the two seal positions in the direction orthogonal to the paper surface.
  • the surface pressure along the seal longitudinal direction approaches uniformly, and the sealing performance of this embodiment is improved.
  • the cutting blade 7 is protruded to divide between the two seal positions. This completes the sealing of the current container and seals the lower end of the next container located on the upper side.
  • the packaging material 30 B portion on the anvil 4 side is along the contact surface 4 A of the anvil 4.
  • a void S is formed.
  • the cross-sectional shape of the void S is defined by the distance from the welding surface portion 10 of the block body 11 and the height of the block body 11.
  • the band-shaped gap S is not in a sealed space state, and the gap between the block bodies 11 is outwardly removed from the two packaging materials. It becomes easy to form between 30.
  • the vibration applying surface 3a of the horn 3 is ultrasonically vibrated, the thermoplastic resin located between the vibration applying surface 3a and the welding surface portion 10 is melted, so that the vibration applying surface 3a and the welding surface portion 10 are melted.
  • the cylindrical packaging material 31 laminated at the sealing position located between the two is sealed (sealed).
  • thermoplastic resin located between the vibration applying surface 3a and the welding surface portion 10 is excessive, a part of the molten thermoplastic resin is pushed out from the sealing position to the side with a predetermined pressure. .
  • the extruded thermoplastic resin flows into the band-shaped gap S, but is further prevented from moving outward by the row of the plurality of block bodies 11. That is, the movement of the extruded thermoplastic resin is blocked by the row of the plurality of block bodies 11.
  • the molten thermoplastic resin flows toward the gap S at a predetermined pressure, but the air present in the gap S is released from the gap between the block bodies 11 to the outside. Therefore, mixing of air into the molten thermoplastic resin that has moved into the void S is suppressed. That is, the collapse of the molten resin mass due to the mixing of air into the molten resin mass is prevented.
  • the shape of the molten resin lump can be made to be a shape along the gap S. That is, it becomes possible to prevent the shape defect of the thermoplastic resin.
  • the plurality of block bodies 11 arranged in a row in this way makes it possible to control the thickness and width of the resin mass due to the protruding thermoplastic resin, so that even when the thermoplastic resin is excessively melted, the irregular shape is formed. It is possible to suppress formation of a molten resin lump that is easily peeled off.
  • the trapezoidal shape of the left and right welding surfaces 10a is different on the outside (paper container side) of the anvil 4 and the cutting side with the knife slit 15, and the trapezoidal paper container side is the knife slit.
  • 15 is a straight line parallel to 15, and the cutting side is a straight line having an angle. This is because, on the outside (paper container side) of the anvil 4, a block or the like is provided to prevent excessive resin from being guided to the contents to be contained when the molten thermoplastic resin is pushed out. is there.
  • the width of the left and right welding surfaces 10a formed of a belt-like shape increases continuously or stepwise as the distance from the recess 10b is illustrated.
  • Embodiments based on the present invention are not limited to this.
  • a belt-like welding surface main body 10d having the same width as that of the prior art and the welding surface main body 10d are disposed separately from each other, and are disposed along the sides of the welding surface main body 10d.
  • the welding surface auxiliary portion 10e is configured, and depending on the area of the welding surface auxiliary portion 10e, each welding surface 10a has a larger area per unit length along the extending direction, You may set so that it may become large continuously or in steps.
  • assistant part 10e shall be the same height.
  • FIG. 9 shows an example in which the area per unit length increases stepwise.
  • FIG. 9 is an example in which belt-like welded surface auxiliary portions 10e are arranged on the end sides of the left and right welded surfaces 10a, respectively.
  • the region G of the auxiliary portion forming position where the welding surface auxiliary portion 10e is provided is, for example, a portion within a range of 2/3 of the length in the extending direction of the corresponding welding surface main body 10d from the outer end of the corresponding welding surface main body 10d. It is set as the area
  • the position where the welding surface auxiliary portion 10e is provided may be set close to the end portion side of the welding surface main body 10d within the region G, for example, may be set within a range of 1/3 from the end portion in the longitudinal direction.
  • the welding surface auxiliary portion 10e is preferably arranged on the knife slit 15 side with respect to the welding surface main body 10d.
  • the width of the belt-shaped welding surface auxiliary portion 10e may be the same width along the longitudinal direction, or may be set to be wide on the seal end side.
  • the welding surface auxiliary portion 10e may be composed of one or two or more convex portions 10f arranged along the welding surface main body 10d in the region G of the auxiliary portion forming position. That is, the welding surface auxiliary part 10e does not necessarily have to be continuous.
  • FIG. 10 shows an example where the area per unit length increases stepwise.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Package Closures (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Closing Of Containers (AREA)
  • Making Paper Articles (AREA)

Abstract

一対のホーンを使用した超音波シール技術において、アンビルの形状を工夫することで、シール部のシール性を向上させることを目的とする。一対のホーン（３）の振動付与面（３ａ）とアンビル（４）の先端面に形成された当接面とで積層体を接合する超音波シール装置における上記アンビル（４）である。当接面には、ホーン（３）側に突出し２つの振動付与面（３ａ）とそれぞれ対向し当該振動付与面（３ａ）の延在方向に沿って配設された左右の溶着面（１０ａ）を有する。左右の溶着面（１０ａ）は、それぞれ上記延在方向に沿った単位長さ当たりの面積が、２つの振動付与面（３ａ）の隣接側であるシール中央側から離れるほど、連続的若しくは段階的に大きくなるように設定されている。

Description

アンビル及び超音波シール装置
　本発明は、２以上のシート体が重ね合わされた積層体を帯状のシール位置で接合するための超音波シール装置に関する技術であって、特に、液体や固形物などを収容する紙容器を構成する、筒状にした積層包材を横断的に封止（超音波シール）するのに好適な技術に関する。
　液体用紙容器は、果実飲料、お茶、コーヒー、乳飲料、スープ等の液体飲料、日本酒、焼酎等の酒類を収容する簡便な容器として広く用いられている。この液体用紙容器には、屋根型やレンガ型、あるいは円筒型などの形状の容器がある。
　例えば、レンガ型形状の容器は、紙層の表裏面に熱可塑性樹脂層を有する包材に、容器用罫線を施し、包材の端部にエッジプロテクションテープを貼り、この包材を筒状に成形して当該包材端部同士を重ねて貼ることで、筒状形状の包材とする。そして、この筒状の包材の下端部を横断方向に接合して下端部をシール（封止）し、その後、筒状の包材の中に内容物を充填した状態で容器の口となる位置（上端部側）を横断方向に液中シールして仕切った後、立体形状に成形することで最終形態の容器形状とする。
　上記筒状の包材に対する横断方向へのシールは、たとえば特許文献１に記載のような超音波シール装置にて実施される。
　すなわち、超音波シール装置によるシールは、容器のシール位置を、対向するホーンの先端面とアンビルの先端面とで押圧しホーンを超音波振動させることで、包材界面（重なり合うシート体同士の接触面位置）で発生する熱により包材表面に存在する熱可塑性樹脂を溶融させてシールする。特に、液体容器のシール状態は重要であり、上記のシールには内容物の保護、運搬・落下衝撃に耐えうる強度が必要とされる。
　また、シール長さが長い場合等にあっては、特許文献２に記載の図１０のように、並列した一対のホーン（変換器ヘッド）を使用してシール長さを稼ぐ。このとき一対のホーン間の間隙位置に、筒状にした包材端部の貼合わせ部分が位置すると、当該貼り合わせ部分が相対的に厚くなる。このため、特許文献２の技術では、アンビルにおける上記一対のホーンの間の間隙に対応する位置に凹み部分を設けている。
特許第４０９３７７５号公報 特許第３９０４６７５号公報（図１０）
　並列した一対のホーンを備えた超音波シール装置を使用した場合、特許文献２のようにアンビルに対し凹み部分を設けたとしても、相対的に厚くなっている上記の貼合わせ部分を支点として、一対のホーンが左右に傾いてハの字の状態（図８参照）となる傾向にある。ここで、シール面圧は均等であることが好ましいが、一対のホーンがハの字状に傾いた場合、超音波溶着される筒状の包材の被溶着部（シール部）の両端部が過剰に加圧された状態で超音波溶着がなされるため、当該両端部では、溶融した熱可塑性樹脂が必要以上に押し出されて、溶着状態が弱くなる恐れがある。
　本発明は、上記のような点に着目してなされたもので、一対のホーンを使用した超音波シール技術において、アンビルの形状を工夫することで、シール部のシール性を向上させることを目的としている。
　課題を解決するために、本発明の一態様は、それぞれ先端面に帯状の振動付与面が形成された一対のホーンが上記振動付与面の延在方向に沿って並ぶように設けられ、上記一対のホーンの振動付与面とアンビルの先端面に形成された当接面の溶着面部とで、熱可塑性樹脂層を有する２以上のシート体が重ね合わされた積層体を挟み込み、上記各振動付与面に伝達された超音波振動で上記シート体に設けられた熱可塑性樹脂を溶融することで当該積層体を接合する超音波シール装置における上記アンビルであって、
　上記溶着面部は、上記ホーン側に突出して上記一対のホーンに形成された各振動付与面とそれぞれ対向し当該振動付与面の延在方向に沿って配設された左右の溶着面を有し、上記左右の溶着面は、それぞれ上記延在方向に沿った単位長さ当たりの面積が、上記一対のホーンの振動付与面の隣接側であるシール中央側から離れるほど、連続的若しくは段階的に大きくなるように設定されていることを特徴とする。
　本発明の一態様によれば、相対的に厚くなっているシール中央側の貼合わせ部分を支点として、一対のホーンがハの字状に傾いたとしても、シール部の両端部側での面圧の上昇が従来より抑制されて、両端部で溶融された熱可塑性樹脂の押し出され量が低減する。この結果、シール性が向上する。
本発明に基づく実施形態に係る超音波シール装置を説明するための模式的側面図である。 本発明に基づく実施形態に係る一対のホーンとアンビルとの関係を示す模式図である。 ホーン及びアンビルの先端部形状を説明するための図１の部分的拡大図である。 左右の溶着面とブロック体の列を説明する平面的模式図である。 包材の層構造を説明する図である。 筒状包材を説明する図であり、（ａ）は斜視図、（ｂ）は（ａ）のＩ－Ｉ断面図である。 左右の溶着面の他のシール形状を説明する平面的模式図である。 シール時のホーンの姿勢とそのときのシール面圧分布の例を説明する図であって、（ａ）は一対のホーンのハの字状態を、（ｂ）はシール方向に沿った面圧分布の例を示す図である。 左右の溶着面の他のシール形状を説明する平面的模式図である。 左右の溶着面の他のシール形状を説明する平面的模式図である。
　次に、本発明の実施形態について図面を参照しつつ説明する。
　超音波シール装置１は、模式図である図１に示すように、超音波発振器９と、超音波振動子であるコンバータ２と、一対のホーン３（図１では１つのホーン３のみ図示）と、アンビル４とを有する。符号５は、アンビル４を支持するジョーを示す。符号６は、一対のホーン３をともに保護するホーンカバーを示す。
　コンバータ２は、超音波発振器９から電力が供給されて超音波振動を発生し、発生した振動を一対のホーン３にそれぞれ伝達することで、そのホーン３の先端部が超音波振動する。
　一対のホーン３は、図２に示すように、所定間隙（例えば１ｍｍの間隙）を開けてシール方向に沿って並ぶように配列した状態で、１つのコンバータ２に支持されている。それぞれ個別のコンバータに支持する構成でも良い。このとき、一対のホーン３は、それぞれ縦方向の振幅が０（ゼロ）になるノーダルポイントの位置でＯリング４０を介してコンバータ２に支持される。
　本実施形態は、同時に上下２条のシールを行う場合の例である。すなわち、先行の紙容器の上端開口部と後続の紙容器となる部分の下端部とを同時にシールする場合の例である。このため、各ホーン３の先端部は二股に分岐しその２つの先端面で、図３に示すように、２条の振動付与面３ａが形成される。各振動付与面３ａは、帯状（若しくは短冊状）の形状をしており、２条の振動付与面３ａは互いに平行に延在する。なお、２条の振動付与面３ａは、図１では、紙面直交方向に延在している。つまり、図１では、一対のホーン３も、紙面直交方向に並んで配設されている。また、２条の振動付与面３ａの間には溝３ｂが形成されている。
　アンビル４の先端面は、ホーン３側を向いた当接面４Ａを構成する。その当接面４Ａに形成された溶着面部１０と、ホーン３の先端面に形成された振動付与面３ａとで、２以上のシート体が重ね合わされてなる積層体を厚さ方向から所定の荷重で挟み込み可能となっている。
　すなわち、当接面４Ａには、各振動付与面３ａに向けてそれぞれ突出する２条の溶着面部１０が形成されている。その各溶着面部１０はそれぞれ、重ね合わされたシート体を挟んで、振動付与面３ａと対向する。
　本実施形態では、拡大模式図である図３に示すように、各溶着面部１０の幅（積層体を介して振動付与面３ａと対向する幅）は、振動付与面３ａの幅よりも短く設定されている。
　また、帯状の溶着面部１０の側方には、複数のブロック体１１の列を有する。その複数のブロック体１１の列は、溶着面部１０の延在方向と同方向に沿って並び、隣り合うブロック体１１が互いに非接触の状態となっている。
　複数のブロック体１１は、各溶着面部１０の両側にそれぞれ存在していても良いが、本実施形態では、複数のブロック体１１の列を、２条の溶着面部１０を間に挟んだ両側に配置する場合を例示している。その各ブロック体１１は、その高さが溶着面部１０の高さ未満か、ブロック体１１の頂面が溶着面部１０の先端面と面一となるように設定されている。
　図３では、ブロック体１１の突出方向（ホーン３とアンビル４による挟持方向）から見て、静止状態の振動付与面３ａとブロック体１１とが重ならない場合を例示しているが、静止状態の振動付与面３ａとブロック体１１とが重なる場合には、各ブロック体１１の高さは溶着面部１０の高さ未満であることが好ましい。
　各複数のブロック体１１は、図４に示すように、溶着面部１０の延在方向に沿って配列するように設定されている。
　ここで、容器を形成する包材３０（シート体）は、例えば図５に示すように、紙からなる基材層３０ａの表面側に外装用樹脂層３０ｂが形成され、また、基材層３０ａの裏面側には、樹脂フィルム３０ｃ、バリア層３０ｄ、及び内装用樹脂層３０ｅがこの順に形成されている。外装用樹脂層３０ｂ、樹脂フィルム３０ｃ、内装用樹脂層３０ｅを構成する樹脂としては、ポリエチレン樹脂を例示出来るが、これに限定されるものではない。ただし少なくとも内装用樹脂層３０ｅは、熱可塑性樹脂から構成される。バリア層３０ｄは、樹脂フィルム３０ｃに蒸着した蒸着膜やアルミ薄板などから構成されて、収容する内容物に応じたバリア性を容器に担保する。
　このような包材３０を、内装用樹脂層３０ｅ側を内側に向けて、図６に示すように、端部同士を重ねた筒状包材３１に成形する。この筒状包材３１は、長尺状の筒形状となる。このとき、上記の筒状包材３１を形成する際に重ねた、包材３０の端部３１ａと端部３１ｂとの重なった貼合わせ部分を重なり部分Ｒと記載する。その重なり部分Ｒは、長尺状の筒状包材３１の軸方向に沿って延びている。
　その重なり部分Ｒには、図６（ｂ）に示すように、エッジプロテクションテープ３２が貼り付けられている。エッジプロテクションテープ３２は、筒状包材３１の内面側に貼り付けられている。
　ここで、少なくともシールするときには、筒状包材３１は、図６（ｂ）のように、扁平に潰された形状となっていて、図６（ｂ）における紙面上下方向から、ホーン３とアンビル４で押圧することで、シール位置では、シート体を構成する包材３０Ａ、３０Ｂが２層重なり合った積層体の状態となる。但し、上記の重なり部分Ｒでは、エッジプロテクションテープ３２を含めると、シート体が４層重なり合った状態となっている。
　このように、重なり部分Ｒでは積層数が多いことから、図４に示すように、その重なり分に当接する溶着面部１０の長手方向中央側部分に、その積層に応じた凹部１０ｂが形成されている。
　その凹部１０ｂがシール中央部分となる。そして、２条の溶着面部１０はそれぞれ、シール中央側である凹部１０ｂから、左右に延在するように配設した左右の溶着面１０ａを有する。左右の溶着面１０ａは、それぞれ上記延在方向に沿った単位長さ当たりの面積が、凹部１０ｂ側（２つの振動付与面３ａの隣接側であるシール中央側）から離れるほど、連続的若しくは段階的に大きくなるように設定されている。
　例えば、左右の溶着面１０ａのシール面形状はそれぞれ、上記シール中央側から離れるにつれて連続的若しくは段階的に幅が広くなる形状となっている。
　本実施形態では、図４に示すように、左右の溶着面１０ａのシール面形状はそれぞれ、上記シール中央側から離れるにつれて連続して大きくなる台形形状となっている場合を例示している。左右の溶着面１０ａは、図７に示すように、階段状に幅が広くなるようになっていても良いし（図７（ａ）参照）、幅方向両側のプロフィールも直線状に限定されず、幅が連続的に広くなる曲線状のプロフィールであっても良い（図７（ｂ）参照）。
　ただし、左右の溶着面１０ａは、外側のブロック体１１の列との間隙は一定となっていることが好ましいことから、本実施形態では、左右の溶着面１０ａの内側のプロフィールだけを傾けることで、左右の溶着面１０ａをシール中央側から離れるにつれて連続して大きくなる台形形状に設定している。左右の溶着面１０ａの片側だけを傾斜させることで溶着面１０ａの設計が容易である。これによって、各溶着面１０ａのシール面形状は、複数のブロック体１１側のプロフィール１０ｘが、当該隣り合う複数のブロック体１１の列との距離が等間隔となるような直線に設計されている。
　また、上記説明では、図４のように、ブロック体１１の溶着面部１０からの離間距離が一様に等しい場合を例示しているがこれに限定されない。例えば、重なり部分Ｒでは、シールする際に発生する熱可塑性樹脂の溶融量が相対的に多くなる傾向にあるため、この位置では、ブロック体１１の溶着面部１０からの離間距離を他の位置の離間距離Ａに比べて広く設定することが好ましい。
　また隣り合うブロック体１１間の間隙は、例えば０．１ｍｍ以上２ｍｍ以下に設定する。
　間隙が０．１ｍｍ未満では、シート体間に、空気が抜けるだけの隙間が形成されがたくなり、一方間隙が２ｍｍを超えると、溶融した樹脂が外方に移動するおそれがあるためである。
　また、２条の溶着面部１０の間には、図１及び図４のように、断裁刃７が進退するナイフスリット１５を構成する溝が配置されている。断裁刃７は、ホーン３側に向けて進退可能に設けられ、２条のシール位置の間を切断して先行と後続の紙容器を分離するために使用される。
　（動作その他）
　図１は、先に容器下端部が封止され、内部に液体を充填されたレンガ型液体用紙容器の口（上端部）をシールすると同時に次の容器の下端部をシールする前の状態を示している。
　この図１の状態から、一対のホーン３の振動付与面３ａとアンビル４の当接面４Ａとで筒状包材３１を両側から所定の荷重で挟み込んで、筒状包材３１を潰してシート体を積層した積層体の状態とし、ホーン３の振動付与面３ａを超音波振動させることで、内装用樹脂層３０ｅを溶融して紙面直交方向に２条のシール位置をシールする。
　このとき、シール中央部に積層数が多い重なり部分Ｒが配置された状態で、一対のホーン３の振動付与面３ａとアンビル４の溶着面部１０とによって所定の加圧で挟み込む事になるため、相対的にシール中央部側の荷重が大きくなる。このとき、一対のホーン３は、Ｏリング４０を介して支持されているため、そのＯリング４０の弾性変形によって、重なり部分Ｒを支点として、図８（ａ）のように、一対のホーン３の姿勢が、コンバータ２側が互いに離れるように左右へハの字状に傾く。これによって、シール両端部での荷重が相対的に大きくなる。しかし、左右の溶着面１０ａは、シール端部に向かうほど単位長さ当たりの面積が大きくなっていることから、圧力（：力÷面積）がその分、低減することが可能となる。
　図８（ｂ）に、左右の溶着面１０ａの幅が長さ方向に一定の場合（実線）と、本願のように左右の溶着面１０ａの幅がシール端部で２倍に設定した場合（一点鎖線）とで、一対のホーン３の振動付与面３ａとアンビル４の当接面４Ａとで挟み込んだときの、圧力分布の状態の例を示す。この図８（ｂ）から分かるように、本願発明を採用することで、圧力分布が実線から一点鎖線の状態に変化して、シール端部側の加圧による面圧が約半分程度に低減することが分かる。
　これによって、本実施形態では、シール長手方向に沿った面圧が均一に近づき、本実施形態のシール性が向上する。
　なお、シールが完了したら、断裁刃７を突出させて２条のシール位置の間を分断する。これによって現在の容器の封止が完了すると共に、上側に位置する次の容器の下端部がシールされる。
　また、ホーン３の振動付与面３ａとアンビル４の当接面４Ａとで筒状包材３１を両側から押圧すると、アンビル４側の包材３０Ｂ部分は、そのアンビル４の当接面４Ａに沿った形状に変形し、振動付与面３ａと溶着面部１０との間のシール位置では、重なり合った２枚の包材３０Ａ、３０Ｂは密着状態となるが、その側方にシール位置に沿った帯状の空隙部Ｓが形成される。この空隙部Ｓの断面形状は、ブロック体１１の溶着面部１０からの離間距離やブロック体１１の高さで規定される。
　このとき、複数のブロック体１１間に間隙が存在することから、上記帯状の空隙部Ｓは密封空間状態とはならず、ブロック体１１間の位置で外方に抜ける間隙が２枚の包材３０間に形成されやすくなる。
　このような状態で、ホーン３の振動付与面３ａを超音波振動させると、振動付与面３ａと溶着面部１０の間に位置する熱可塑性樹脂が溶融することで、振動付与面３ａと溶着面部１０の間に位置するシール位置で積層した筒状包材３１がシール（封止）される。
　このとき、振動付与面３ａと溶着面部１０との間に位置する熱可塑性樹脂が過剰の場合には、溶融した熱可塑性樹脂の一部がシール位置から側方に所定の圧を持って押し出される。
　この押し出された熱可塑性樹脂は、上記帯状の空隙部Ｓに流れ込むが、複数のブロック体１１の列によってそれ以上外側に移動することが抑制される。すなわち、押し出された熱可塑性樹脂の移動は複数のブロック体１１の列によって堰き止められる。
　またこのとき、溶融した熱可塑性樹脂が所定の圧で空隙部Ｓに向けて流れ込むわけであるが、上記空隙部Ｓに存在した空気はブロック体１１間の間隙から外方に抜けることで圧抜きが行われることから、上記空隙部Ｓに移動した溶融状態の熱可塑性樹脂に対する空気の混入が抑制される。すなわち、溶融樹脂塊への空気の混入による溶融樹脂塊の崩れが防止される。
　また、溶融樹脂塊の形状を上記空隙部Ｓに沿った形状にすることが出来る。すなわち、熱可塑性樹脂の形状不良を防止することが可能となる。
　このように一列に並ぶ複数のブロック体１１によって、はみ出た熱可塑性樹脂による樹脂塊の厚さと幅を制御可能となることから、過剰に熱可塑性樹脂が溶融された場合であっても、不定形な剥がれ易い溶融樹脂塊の形成を抑止することが出来る。
　このとき、本実施形態では、左右の溶着面１０ａの台形形状は、アンビル４の外側（紙容器側）とナイフスリット１５のある断裁側とで形状が異なり、台形形状の紙容器側はナイフスリット１５と平行な直線であり、断裁側は、角度を有する直線である。これは、アンビル４の外側（紙容器側）には、溶融された熱可塑性樹脂が押し出されたときに、収容する内容物へ過剰な樹脂が導かれないように施すブロックなどを配置するためである。
　ここで、上記説明では、帯状からなる左右の溶着面１０ａの幅が、凹部１０ｂから離れるほど連続的に若しくは段階的に大きくなる場合を例示した。本発明に基づく実施形態は、これに限定されない。例えば、左右の溶着面１０ａとして、従来と同様な同幅の帯状の溶着面本体１０ｄと、その溶着面本体１０ｄと分離して別に配置され、溶着面本体１０ｄの側方に沿って配設された溶着面補助部１０ｅとから構成し、その溶着面補助部１０ｅの面積によって、上記各溶着面１０ａは、延在方向に沿った単位長さ当たりの面積が、上記シール中央側から離れるほど、連続的若しくは段階的に大きくなるように設定しても良い。溶着面本体１０ｄと溶着面補助部１０ｅの高さは等しい高さとする。上記の例を図９に示す。図９は単位長さ当たりの面積が段階的に大きくなる例である。
　図９は、左右の溶着面１０ａのうちの端部側にそれぞれ帯状の溶着面補助部１０ｅを配置した例である。溶着面補助部１０ｅを設ける補助部形成位置の領域Ｇは、例えば、対応する溶着面本体１０ｄの外端から、対応する溶着面本体１０ｄにおける延在方向の長さの２／３の範囲の部分の側方位置の領域とする。溶着面補助部１０ｅを設ける位置は、領域Ｇ内であれば溶着面本体１０ｄの端部側に寄せて設定、例えば端部から長手方向１／３の範囲に設定してもよい。
　溶着面補助部１０ｅは、溶着面本体１０ｄに対しナイフスリット１５側に配置することが好ましい。帯状の溶着面補助部１０ｅの幅は、長手方向に沿って同幅でも良いし、シール端部側幅広となるように設定しても良い。また、溶着面補助部１０ｅは、図１０のように、補助部形成位置の領域Ｇの領域内で溶着面本体１０ｄに沿って並ぶ、１又は２以上の凸部１０ｆから構成しても良い。すなわち、溶着面補助部１０ｅは必ずしも連続していなくても良い。図１０は、単位長さ当たりの面積が段階的に大きくなる場合の例である。
　以上、各実施形態により本発明を説明したが、本発明の範囲は、図示され記載された例示的な実施形態に限定されるものではなく、本発明が目的とするものと均等な効果をもたらす全ての実施形態をも含む。さらに、本発明の範囲は、請求項により画される発明の特徴の組合せに限定されるものではなく、全ての開示されたそれぞれの特徴のうち特定の特徴のあらゆる所望する組合せによって画されうる。
　また、本願が優先権を主張する、日本国特許出願２０１６－１７８４５０号（２０１６年９月１３日出願）の全内容は、参照により本開示の一部をなす。
１　超音波シール装置
２　コンバータ
３　ホーン
３ａ　振動付与面
４　アンビル
４Ａ　当接面
５　ジョー
６　ホーンカバー
７　断裁刃
９　超音波発振器
１０　溶着面部
１０ａ　左右の溶着面
１０ｂ　凹部
１０ｄ　溶着面本体
１０ｅ　溶着面補助部
１０ｆ　凸部
１１　ブロック体
１５　ナイフスリット
３０　包材
３１　筒状包材

Claims (5)

  1. 　それぞれ先端面に帯状の振動付与面が形成された一対のホーンが上記振動付与面の延在方向に沿って並ぶように設けられ、上記一対のホーンの振動付与面とアンビルの先端面に形成された当接面の溶着面部とで、熱可塑性樹脂層を有する２以上のシート体が重ね合わされた積層体を挟み込み、上記各振動付与面に伝達された超音波振動で上記シート体に設けられた熱可塑性樹脂を溶融することで当該積層体を接合する超音波シール装置における上記アンビルであって、
    　上記溶着面部は、上記ホーン側に突出して上記一対のホーンに形成された各振動付与面とそれぞれ対向し当該振動付与面の延在方向に沿って配設された左右の溶着面を有し、
    　上記左右の溶着面は、それぞれ上記延在方向に沿った単位長さ当たりの面積が、上記一対のホーンの振動付与面の隣接側であるシール中央側から離れるほど、連続的若しくは段階的に大きくなるように設定されていることを特徴とするアンビル。
  2. 　上記左右の溶着面はそれぞれ、上記シール中央側から離れるにつれて連続的若しくは段階的に幅が広くなる形状となっていることを特徴とする請求項１に記載したアンビル。
  3. 　上記一対のホーンの先端面にはそれぞれ、所定間隔を開けて並列した２条の振動付与面を有し、アンビルの先端面にも、上記２条の振動付与面に対応して２条の溶着面部を有する超音波装置における上記アンビルであって、
    　上記当接面には、上記２条の溶着面部を間に挟んだ両側にそれぞれ上記溶着面部の延在方向と同方向に沿って並び互いに非接触の複数のブロック体の列を有し、上記複数のブロック体の高さは、上記溶着面の高さ以下であり、
    　上記左右の各溶着面のシール面形状は、上記複数のブロック体側のプロフィールが、当該隣り合う複数のブロック体の列との距離が等間隔となるように設計されていることを特徴とする請求項２に記載したアンビル。
  4. 　上記左右の溶着面は、帯状の溶着面本体と、その溶着面本体と分離して配置され、溶着面本体の側方に沿って配設された溶着面補助部とから構成され、その溶着面補助部の面積によって、上記各溶着面は、延在方向に沿った単位長さ当たりの面積が、上記シール中央側から離れるほど、連続的若しくは段階的に大きくなるように設定されていることを特徴とする請求項１に記載したアンビル。
  5. 　内部に液体若しくは固形物を収容する容器の口を溶着により封止する超音波シール装置であって、
    　請求項１～請求項４のいずれか１項に記載したアンビルを有することを特徴とする超音波シール装置。
PCT/JP2017/031842 2016-09-13 2017-09-04 アンビル及び超音波シール装置 WO2018051835A1 (ja)

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