JP4434347B2 - Partially welded container and manufacturing method thereof - Google Patents

Partially welded container and manufacturing method thereof Download PDF

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Publication number
JP4434347B2
JP4434347B2 JP36243698A JP36243698A JP4434347B2 JP 4434347 B2 JP4434347 B2 JP 4434347B2 JP 36243698 A JP36243698 A JP 36243698A JP 36243698 A JP36243698 A JP 36243698A JP 4434347 B2 JP4434347 B2 JP 4434347B2
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Japan
Prior art keywords
lid
container
horn
flange portion
welded
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Expired - Lifetime
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JP36243698A
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JP2000185752A (en
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勉 鴨島
勇治 嶋村
宏志 鈴木
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Shibuya Packaging System Corp
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Fabrica Toyama Corp
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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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83541—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws flying jaws, e.g. jaws mounted on crank mechanisms or following a hand over hand movement
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • 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
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • 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
    • 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
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2424—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain
    • B29C66/24243—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral
    • B29C66/24244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral forming a rectangle
    • B29C66/24245—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral forming a rectangle forming a square
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/727—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 porous, e.g. foam
    • 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
    • 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
    • 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
    • B29C66/8145—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
    • B29C66/81465—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 one placed behind the other in a single row in the feed direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9261—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools
    • B29C66/92611—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by controlling or regulating the gap between the joining tools
    • B29C66/92613—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by controlling or regulating the gap between the joining tools the gap being kept constant over time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—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
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Package Closures (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

【０００１】
本発明は、納豆などを内容物とした熱溶融性の発泡樹脂製の容器本体のフランジ部と、蓋体とを部分的に溶着した容器およびその製造方法に関する。
【０００２】
【従来の技術】
納豆などが収納される容器は、発泡スチロールなどの熱溶融性の発泡樹脂により形成されており、同じく蓋体も熱溶融性の発泡樹脂などで形成されている。
【０００３】
この種の容器では、開封するときに蓋体が容易に剥がれることが必要であり、そのため従来は容器本体のフランジ部と蓋体とが熱溶融により部分的に溶着されているものが主であった。
【０００４】
前記熱溶融による溶着方法は、ニクロム線を使用し、このニクロム線に通電してジュール熱を発生させる。このニクロム線を、容器本体のフランジ部と蓋体との合わせ面に当て、熱により発泡樹脂を溶融して、フランジ部と蓋体とを熱溶着させている。
【０００５】
【発明が解決しようとする課題】
しかし、前記熱溶融による溶着方法には、以下に示す問題が生じる。
（１）ニクロム線を用いた熱溶着では、容器本体のフランジ部と蓋体との接合面での発泡樹脂の溶融状態を安定させることができない。その結果、蓋体の接合不良が生じて、運搬中などに蓋体が剥がれてしまったり、またはフランジ部と蓋体との接合面での発泡樹脂の溶融が過剰になり、蓋体を剥がしにくくなって、無理に剥がそうとすると容器本体に割れが生じることがある。
（２）ニクロム線を使用した熱溶着方法では、フランジ部と蓋体との間に加熱したニクロム線を挿入し、発泡樹脂が溶融した直後にフランジ部と蓋体とを接合して加圧するという複雑で困難な作業が必要になる。
（３）発熱したニクロム線での溶着作業では、ニクロム線の発熱で容器が発火したり、またはニクロム線の近くに燃えやすいものや発火しやすいものが置いてあるとこれらが発火して、火災を生じる危険性がある。
【０００６】
本発明は上記従来の課題を解決するものであり、発泡樹脂製の容器本体と蓋体とを、常に最適な溶着状態にて溶着でき、また溶着部の外観も良好な容器を提供することを目的としている。
また、本発明は、容器本体と蓋体とを常に安定した条件で溶着できる容器の製造方法を提供することを目的としている。
【０００７】
【課題を解決するための手段】
本発明は、発泡樹脂製の容器本体と、この容器本体を塞ぐ同じく発泡樹脂製の蓋体とから成り、前記容器本体のフランジ部に前記蓋体が部分溶着されている容器において、
前記フランジ部と蓋体との合わせ面に、発泡樹脂どうしが超音波振動で加熱された溶着領域が形成されており、
前記溶着領域は、その周囲部分で前記発泡樹脂どうしが溶着され、前記周囲部分の内側の中間部分に空隙が形成されていることを特徴とするものである。
【０００８】
上記において、前記フランジ部と蓋体との合わせ面での、発泡樹脂の溶融領域はほぼ円形であり、前記フランジ部と蓋体の厚さの合計をＴとしたときに、前記溶融領域の直径ｄが前記厚さＴの１倍から２倍の範囲であることが好ましい。
【０００９】
超音波を用いて容器本体と蓋体とを溶着すると、ニクロム線を使用した溶着よりも溶着状態が安定する。
【００１０】
特に、溶融領域の直径ｄを合計厚さＴの１倍から２倍にすると、容器本体と蓋体との接合強度が安定し、封止状態で蓋体が不用意に剥がれることがない。また蓋体を比較的に楽に剥がすことができ、またこのとき容器本体に割れを生じさせるようなことがない。
【００１１】
また本発明は、発泡樹脂製の容器本体と、この容器本体を塞ぐ同じく発泡樹脂製の蓋体とを、前記容器本体のフランジ部で部分溶着する容器の製造方法において、
前記フランジと蓋体とを重ねて、一方の側にホーンを他方の側に受け台を配置し、前記ホーンを溶着箇所に圧接した状態で、前記ホーンの加圧端面と前記受け台との距離を前記フランジ部と前記蓋体の合計厚さＴよりも短い一定の間隔Ｈに設定し、前記ホーンに超音波振動を印加してフランジ部と蓋体との合わせ面を発熱させ、周囲部分で前記発泡樹脂どうしが溶着され前記周囲部分の内側の中間部分に空隙が形成された溶着領域を形成することを特徴とするものである。
【００１３】
本発明では、ホーンを容器の溶着箇所に加圧する際、ホーンの圧力が一定となるようにばねなどで設定してもよいが、ホーンと受け台との間隔Ｈが一定となるようにホーンの位置を設定することが好ましい。
【００１４】
この方法では、フランジ部と蓋体との合わせ面と、ホーン先端との距離が常にほぼ一定になる。さらに、ホーンと受け台との距離を前記のように所定値に設定した後に、ホーンに超音波を印加しているため、フランジ部と蓋体との接合面に与えられる超音波エネルギーが常に一定となる。その結果、安定した条件で、フランジ部と蓋体との合わせ面で発泡樹脂が溶融されるものとなる。またホーンと接合面との距離が一定であるため、ホーンへ与える超音波エネルギーを可変するだけで、溶着状態の調整を容易に行うことができる。
この場合に、前記間隔Ｈを、前記厚さＴの０．５倍から０．７倍の範囲に設定することが好ましい。
【００１５】
さらに本発明の製造方法に使用するホーンは、断面が円形で、且つ溶着箇所に当たる先端の周囲がアール形状であることが好ましい。
先端の周囲をアールにすると、発泡樹脂の表面にホーンを加圧した時の圧痕が残らなくなり、溶着後の容器の外観が良好になる。
【００１６】
さらに、ホーンの断面の直径Ｄを、前記厚さＴの１．２倍から２．４倍の範囲に設定すると、前記溶融領域の直径ｄを厚さＴとの関係で最適に設定できる。
また、ホーンは先端が複数の当接部に分岐されたものとし、この分岐された個々の当接部により、フランジ部と蓋体との溶着を同時に行うことが可能である。
【００１７】
この分岐型のホーンを用いると、複数の溶着箇所に同じ条件で超音波エネルギーを与えることができ、溶着箇所相互の溶着条件を均一にできる。また自動機（溶着装置）でのホーンやブースタなどの溶着用部品の絶対数を減らすことができ、溶着装置を安価に構成できる。
【００１８】
【発明の実施の形態】
図１は本発明の容器を示し、（Ａ）は平面図、（Ｂ）は側面図である。
この容器１は、中央が凹状で開口部周囲にフランジ部２ａが形成された容器本体２と、この容器本体２の開口部を覆う蓋体３とから構成されている。容器本体２と蓋体３は、ヒンジ部４で接合されており、蓋体３は前記ヒンジ部４を支点として上方ヘ開放できるようになっている。このヒンジ部４と逆側が、フランジ部２ａと蓋体３との合わせ部５であり、この合わせ部５において、フランジ部２ａと蓋体３とが互いに溶着されている。
【００１９】
容器本体２と蓋体３は、熱溶融性の発泡樹脂、例えば発泡スチロール製である。容器本体２と蓋体３は、ヒンジ部４を介して互いに接合された状態で成型される。
【００２０】
前記合わせ部５では、フランジ部２ａと蓋体３との合わせ面が超音波により摩擦を生じその摩擦熱で加熱させられて溶融し、互いに溶着されている。図１では、その溶着領域αを破線で示している。溶着領域αはほぼ円形であり、その間隔Ｌは３０ｍｍから６０ｍｍ程度である。
【００２１】
図２は、前記容器１の溶着領域αを溶着する溶着装置の概略を示している。
この溶着装置では、搬送装置１３上に納豆などの内容物が入れられた容器１が一定のピッチで並べられ、一定速度ｖにて図示左方向へ連続的に搬送される。
【００２２】
搬送装置１３上には、２本の超音波ホーン１０を１組として、これが２組設けられ、合計４本の超音波ホーン１０が、支持フレーム１１に支持されている。各超音波ホーン１０に超音波振動を与える発振器やブースタなどは前記支持フレーム１１に支持されている。
【００２３】
前記支持フレーム１１およびこれに保持された超音波ホーン１０は、搬送装置１３による容器１の搬送速度ｖに同期して、▲１▼、▲２▼、▲３▼、▲４▼で示すいわゆるボックス動作を行う。また前記超音波ホーン１０に対向する位置には、容器本体２のフランジ部２ａの下側を支持する受け台１２が設けられている。前記超音波ホーン１０と受け台１２とで、フランジ部２ａおよび蓋体３が挟持される。この受け台１２は、前記支持フレーム１１のボックス動作に合わせて図示左右方向へ移動する。そして支持フレーム１１の▲１▼方向への動作中に、ホーン１０と受け台１２および容器１の左方向への速度ｖが一致し、このときフランジ部２ａと蓋体３とに超音波が与えられて溶着される。
【００２４】
図３に示すように、超音波ホーン１０は断面が円形であり、その直径Ｄは１０ｍｍである。また加圧端面１０ａの周囲には曲率半径１ｍｍ程度のアール面（ｒ）が形成されている。このアール面（ｒ）が形成されていることにより、超音波溶着が完了した後に、蓋体３の表面に前記加圧端面１０ａの圧痕が残りにくくなり、溶着完了後の蓋体３の表面の外観が良好になる。
【００２５】
またこの溶着装置を用いた容器の製造方法では、図３に示すように、受け台１２と超音波ホーン１０とでフランジ部２ａおよび蓋体３を挟持するときに、従来のように超音波ホーン１０をばねなどで一定の圧力で押し付けるのではなく、超音波ホーン１０が下降したときに、超音波ホーン１０の加圧端面１０ａと受け台１２との距離Ｈが常に一定になるように、超音波ホーン１０の下降位置を設定している。そして、超音波ホーン１０が前記距離Ｈまで完全に下降してから、超音波ホーン１０に超音波振動が与えられる。
【００２６】
したがって、フランジ部２ａと蓋体３との合わせ面５ａと超音波ホーン１０の押圧端面１０ａとの間隔ｈが常にほぼ一定となるように安定した状態で、超音波ホーン１０から合わせ面５ａに超音波振動が与えられることになり、合わせ面５ａでの溶融領域αの溶融状態が常に安定したものとなる。
【００２７】
この実施の形態では、超音波ホーン１０の断面の直径Ｄが１０ｍｍであり、この超音波ホーン１０に振動数が２８ｋＨｚで、縦振動の振幅が６０〜７０μｍの超音波振動が０．１〜０．３秒間与えられる。
【００２８】
またフランジ部２ａと蓋体３の厚さｔは共に２．３ｍｍで、フランジ部２ａと蓋体３が重ねられた状態での全体の厚さＴは４．６ｍｍである。
この条件下では、前記距離Ｈは、厚さＴの０．５倍から０．７倍、すなわちＨは２．３ｍｍから３．２ｍｍの範囲であることが好ましい。このように設定すると、弾性を有する発泡樹脂で形成されたフランジ部２ａと蓋体３とが押圧収縮された状態で、加圧端面１０ａと合わせ面５ａとの距離ｈを常に均一にでき、溶着領域αでの溶着条件を安定させることができる。
【００２９】
次に、加圧端面１０ａから超音波振動が与えられると、発泡樹脂どうしの合わせ面５ａで自己発熱するが、発泡樹脂の場合には溶けるとその内部に空隙が形成される。したがって、溶着領域αでは、周囲部分（イ）において、フランジ部２ａと蓋体３を構成する発泡樹脂どうしが溶融されて互いに接着され、その中間部分（ロ）は空隙が形成される。よって、フランジ部２ａと蓋体３との接合強度は、前記周囲部分（イ）の周長および前記周囲部分（イ）の溶着状態により決められる。
【００３０】
周囲部分（イ）の溶着状態は、前記のように受け台１２と加圧端面１０ａとの距離Ｈを適正に設定することにより良好に保つことができる。また、前記周囲部分（イ）の周長は、主に超音波ホーン１０の直径Ｄに依存する。
【００３１】
前記周囲部分（イ）の周長を最適にし、蓋体３を手で剥がしやすく、しかも過剰な溶着強度とならず、蓋体３を剥がすときに容器本体２に割れなどが生じないようにするためには、溶着領域の直径ｄが、前記厚さＴの１倍から２倍が好ましい。例えば厚さＴが４．６ｍｍの場合、直径ｄの好ましい範囲は４．６ｍｍから９．２ｍｍの範囲である。また、超音波ホーン１０の直径は、前記溶着領域αの直径ｄの１．２倍程度必要である。よって、超音波ホーン１０の直径Ｄの好ましい範囲は、Ｔの１．２倍から２．４倍である。Ｔが４．６ｍｍの場合、超音波ホーン１０の直径Ｄの好ましい範囲は５．５ｍｍから１１．０ｍｍである。
【００３２】
厚さ２．３ｍｍの発泡スチロールのフランジ部２ａと蓋材３を、直径Ｄが１０ｍｍの超音波ホーン１０を用い、Ｈを３．０ｍｍとし、２８ｋＨｚで振幅６０μｍの縦振動を０．２秒間与えて超音波溶着したところ、直径ｄが平均で７ｍｍの溶着領域αを得ることができた。その結果、蓋体３を手で剥がすことができ、このとき容器本体２に割れなどが生じなかった。また蓋体３の表面の超音波ホーン１０が加圧されていた領域に圧痕がほとんど残らなかった。
【００３３】
次に、図４（Ａ）（Ｂ）は本発明の製造方法に好適な、超音波ホーン１０Ａを示している。この超音波ホーン１０Ａの基端は発振器などに取付けられているが、先端には２つの当接部１０Ｂ、１０Ｂが分岐形成されている。
【００３４】
この超音波ホーン１０Ａを溶着装置に取付けると、分岐された当接部１０Ｂ、１０Ｂによって、図１（Ａ）に示すように、１つの容器に２つの溶着領域αを同時に形成することができる。また両溶着領域αに同じ条件の超音波振動を与えることができ、同じ容器に形成される溶着領域αに溶着条件の差が生じにくい。また図２に示すように各溶着領域に別々の超音波ホーンを用いるものに比べ、発振器やブースタなどの数を減らすことができる。
【００３５】
なお、本発明の製造方法を実施する溶着装置は、容器１を一定速度で連続送りするものに限られず、間欠送りするものであってもよい。
【００３６】
【発明の効果】
以上のように、本発明では納豆の容器などのような、発泡樹脂製の容器の、容器本体と蓋体とを、常に最適な状態で部分的に溶着できる。溶着状態が安定するため、蓋体を適度な力で剥がすことができ、また溶着部分の外観も良好になる。
【図面の簡単な説明】
【図１】（Ａ）は本発明の容器の平面図、（Ｂ）はその側面図、
【図２】溶着装置の構成の概略を示す正面図、
【図３】溶着動作を詳しく説明する拡大説明図、
【図４】（Ａ）は超音波ホーンの一例を示す正面図、（Ｂ）はその底面図、
【符号の説明】
１ 容器
２ 容器本体
２ａ フランジ部
３ 蓋体
５ 合わせ部
１０ 超音波ホーン
１２ 受け台
α 溶着領域[0001]
The present invention relates to a container in which a flange portion of a container body made of a heat-meltable foamed resin containing natto and the like and a lid are partially welded, and a method for manufacturing the same .
[0002]
[Prior art]
A container for storing natto or the like is formed of a heat-melting foamed resin such as polystyrene foam, and the lid is also formed of a heat-melting foamed resin or the like.
[0003]
In this type of container, it is necessary that the lid body be easily peeled off when opening the container. For this reason, conventionally, the flange part of the container body and the lid body are mainly partially welded by heat melting. It was.
[0004]
The welding method by heat melting uses a nichrome wire and energizes this nichrome wire to generate Joule heat. The nichrome wire is applied to the mating surface between the flange portion and the lid body of the container body, and the foamed resin is melted by heat to thermally weld the flange portion and the lid body.
[0005]
[Problems to be solved by the invention]
However, the following problems occur in the welding method by heat melting.
(1) In the heat welding using a nichrome wire, the molten state of the foamed resin at the joint surface between the flange portion of the container body and the lid cannot be stabilized. As a result, the joint of the lid may be poor, and the lid may be peeled off during transportation, or the foamed resin may be excessively melted at the joint surface between the flange and the lid, making it difficult to remove the lid. When it tries to peel off forcibly, the container body may be cracked.
(2) In the heat welding method using a nichrome wire, a heated nichrome wire is inserted between the flange portion and the lid, and the flange portion and the lid are joined and pressurized immediately after the foamed resin is melted. Complex and difficult work is required.
(3) In welding work with heated nichrome wire, if the nichrome wire generates heat, the container will ignite, or if there are flammable or flammable items near the nichrome wire, these will ignite and fire. There is a risk of causing.
[0006]
The present invention solves the above-mentioned conventional problems, and provides a container in which a foamed resin container main body and a lid can always be welded in an optimum welding state, and the appearance of the welded part is also good. It is aimed.
Moreover, this invention aims at providing the manufacturing method of the container which can always weld a container main body and a cover body on the stable conditions.
[0007]
[Means for Solving the Problems]
The present invention comprises a container body made of foamed resin and a cover body made of the same foamed resin that closes the container body, and the lid is partially welded to the flange portion of the container body.
A welding region in which foamed resins are heated by ultrasonic vibration is formed on the mating surface of the flange portion and the lid ,
The welding region is characterized in that the foamed resins are welded at the peripheral portion thereof, and a gap is formed in an intermediate portion inside the peripheral portion .
[0008]
In the above, at the mating surface between the flange portion and the lid, the melting area of the foamed resin is substantially circular, the total thickness of the flange portion and the lid when T, the diameter of the melted region It is preferable that d is in the range of 1 to 2 times the thickness T.
[0009]
When the container body and the lid are welded using ultrasonic waves, the welding state is more stable than welding using nichrome wire.
[0010]
In particular, when the diameter d of the melting region is set to 1 to 2 times the total thickness T, the bonding strength between the container body and the lid is stabilized, and the lid is not inadvertently peeled off in a sealed state. Further, the lid can be removed relatively easily, and at this time, the container body is not cracked.
[0011]
Further, the present invention provides a container manufacturing method in which a foamed resin container body and a foamed resin lid that closes the container body are partially welded at a flange portion of the container body.
The flange and the lid are overlapped, a horn is placed on one side, a cradle is placed on the other side, and the distance between the pressure end face of the horn and the cradle is in a state where the horn is pressed against the welding location. Is set to a constant interval H shorter than the total thickness T of the flange portion and the lid body, and ultrasonic vibration is applied to the horn to heat the mating surface of the flange portion and the lid body. The foamed resins are welded together to form a welded region in which a gap is formed in an intermediate portion inside the peripheral portion .
[0013]
In the present invention, when pressurizing the horn to the welded portion of the container, it may be set with a spring or the like so that the pressure of the horn is constant, but the horn is designed so that the distance H between the horn and the cradle is constant. It is preferable to set the position.
[0014]
In this method, the distance between the mating surface of the flange portion and the lid and the horn tip is always substantially constant. Furthermore, since the ultrasonic wave is applied to the horn after setting the distance between the horn and the cradle to a predetermined value as described above, the ultrasonic energy applied to the joint surface between the flange portion and the lid is always constant. It becomes. As a result, the foamed resin is melted at the mating surface between the flange portion and the lid under stable conditions. Further, since the distance between the horn and the joint surface is constant, the welding state can be easily adjusted only by changing the ultrasonic energy applied to the horn.
In this case, it is preferable that the interval H is set in a range of 0.5 to 0.7 times the thickness T.
[0015]
Furthermore, it is preferable that the horn used in the manufacturing method of the present invention has a circular cross section and a round shape around the tip that hits the welding location.
When the periphery of the tip is rounded, no impression remains when the horn is pressed on the surface of the foamed resin, and the appearance of the container after welding is improved.
[0016]
Furthermore, when the diameter D of the cross section of the horn is set in the range of 1.2 times to 2.4 times the thickness T, the diameter d of the melting region can be optimally set in relation to the thickness T.
Further, the tip of the horn is branched into a plurality of contact portions, and the flange portion and the lid can be welded simultaneously by the branched contact portions.
[0017]
When this branched horn is used, ultrasonic energy can be applied to a plurality of welding locations under the same conditions, and the welding conditions between the welding locations can be made uniform. Further, the absolute number of welding parts such as a horn and a booster in an automatic machine (welding apparatus) can be reduced, and the welding apparatus can be configured at low cost.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a container according to the present invention, in which (A) is a plan view and (B) is a side view.
The container 1 includes a container body 2 having a concave center and a flange 2a formed around the opening, and a lid 3 that covers the opening of the container body 2. The container body 2 and the lid 3 are joined by a hinge part 4, and the lid 3 can be opened upward with the hinge part 4 as a fulcrum. The opposite side of the hinge portion 4 is a mating portion 5 between the flange portion 2a and the lid body 3. In the mating portion 5, the flange portion 2a and the lid body 3 are welded to each other.
[0019]
The container main body 2 and the lid 3 are made of a heat-meltable foamed resin, for example, styrene foam. The container body 2 and the lid 3 are molded in a state where they are joined to each other via the hinge portion 4.
[0020]
In the mating portion 5, the mating surfaces of the flange portion 2a and the lid 3 are frictioned by ultrasonic waves, heated by the frictional heat, melted, and welded together. In FIG. 1, the welding region α is indicated by a broken line. The welding region α is substantially circular, and the interval L is about 30 mm to 60 mm.
[0021]
FIG. 2 shows an outline of a welding apparatus for welding the welding region α of the container 1.
In this welding apparatus, the containers 1 in which contents such as natto are placed on the transport device 13 are arranged at a constant pitch and continuously transported in the left direction in the figure at a constant speed v.
[0022]
Two sets of two ultrasonic horns 10 are provided on the transport device 13, and two sets are provided, and a total of four ultrasonic horns 10 are supported by the support frame 11. An oscillator, a booster, and the like that apply ultrasonic vibration to each ultrasonic horn 10 are supported by the support frame 11.
[0023]
The support frame 11 and the ultrasonic horn 10 held by the support frame 11 are so-called boxes indicated by (1), (2), (3), and (4) in synchronization with the transport speed v of the container 1 by the transport device 13. Perform the action. A cradle 12 that supports the lower side of the flange portion 2 a of the container body 2 is provided at a position facing the ultrasonic horn 10. The ultrasonic horn 10 and the cradle 12 sandwich the flange portion 2a and the lid 3. The cradle 12 moves in the left-right direction in the drawing in accordance with the box operation of the support frame 11. During the operation of the support frame 11 in the direction (1), the speed v in the left direction of the horn 10, the cradle 12 and the container 1 coincides, and at this time, an ultrasonic wave is applied to the flange portion 2 a and the lid 3. And welded.
[0024]
As shown in FIG. 3, the ultrasonic horn 10 has a circular cross section and a diameter D of 10 mm. Further, a rounded surface (r) having a curvature radius of about 1 mm is formed around the pressurizing end surface 10a. By forming the rounded surface (r), after the ultrasonic welding is completed, the indentation of the pressure end surface 10a is less likely to remain on the surface of the lid body 3, and the surface of the lid body 3 after the welding is completed. Appearance is improved.
[0025]
Further, in the container manufacturing method using this welding apparatus, as shown in FIG. 3, when the flange portion 2a and the lid 3 are sandwiched between the cradle 12 and the ultrasonic horn 10, the ultrasonic horn is conventionally used. Rather than pressing 10 with a constant pressure with a spring or the like, when the ultrasonic horn 10 is lowered, the distance H between the pressure end surface 10a of the ultrasonic horn 10 and the cradle 12 is always constant. The descending position of the sonic horn 10 is set. Then, after the ultrasonic horn 10 is completely lowered to the distance H, ultrasonic vibration is applied to the ultrasonic horn 10.
[0026]
Therefore, in a stable state so that the interval h between the mating surface 5a of the flange portion 2a and the lid 3 and the pressing end surface 10a of the ultrasonic horn 10 is always substantially constant, the ultrasonic horn 10 is superposed on the mating surface 5a. Sonic vibration is applied, and the molten state of the melting region α at the mating surface 5a is always stable.
[0027]
In this embodiment, the diameter D of the cross section of the ultrasonic horn 10 is 10 mm, and the ultrasonic horn 10 has a vibration frequency of 28 kHz and an ultrasonic vibration with a longitudinal vibration amplitude of 60 to 70 μm of 0.1 to 0. Give for 3 seconds.
[0028]
Further, the thickness t of the flange portion 2a and the lid body 3 is both 2.3 mm, and the total thickness T in a state where the flange portion 2a and the lid body 3 are overlapped is 4.6 mm.
Under this condition, the distance H is preferably 0.5 to 0.7 times the thickness T, that is, H is preferably in the range of 2.3 mm to 3.2 mm. With this setting, the distance h between the pressurizing end surface 10a and the mating surface 5a can always be made uniform in a state where the flange portion 2a formed of an elastic foamed resin and the lid body 3 are pressed and contracted. The welding conditions in the region α can be stabilized.
[0029]
Next, when ultrasonic vibration is applied from the pressure end face 10a, self-heating occurs at the mating face 5a between the foamed resins, but in the case of the foamed resin, a void is formed in the interior when melted. Therefore, in the welding region α, the foamed resin constituting the flange portion 2a and the lid 3 are melted and bonded to each other in the peripheral portion (A), and a gap is formed in the intermediate portion (B). Therefore, the joint strength between the flange portion 2a and the lid 3 is determined by the peripheral length of the peripheral portion (A) and the welded state of the peripheral portion (A).
[0030]
The welded state of the surrounding portion (A) can be kept good by appropriately setting the distance H between the cradle 12 and the pressure end face 10a as described above. Further, the peripheral length of the peripheral portion (A) mainly depends on the diameter D of the ultrasonic horn 10.
[0031]
The peripheral length of the peripheral portion (a) is optimized, the lid 3 is easily peeled off by hand, does not have excessive welding strength, and the container body 2 is not cracked when the lid 3 is peeled off. For this purpose, the diameter d of the welding region is preferably 1 to 2 times the thickness T. For example, when the thickness T is 4.6 mm, the preferable range of the diameter d is from 4.6 mm to 9.2 mm. Further, the diameter of the ultrasonic horn 10 needs to be about 1.2 times the diameter d of the welding region α. Therefore, the preferable range of the diameter D of the ultrasonic horn 10 is 1.2 times to 2.4 times T. When T is 4.6 mm, the preferable range of the diameter D of the ultrasonic horn 10 is 5.5 mm to 11.0 mm.
[0032]
Using an ultrasonic horn 10 having a diameter D of 10 mm, a flange portion 2 a of foamed polystyrene having a thickness of 2.3 mm, and a lid 3, H is set to 3.0 mm, longitudinal vibration with an amplitude of 60 μm at 28 kHz is applied for 0.2 seconds. As a result of ultrasonic welding, a welding region α having an average diameter d of 7 mm could be obtained. As a result, the lid 3 could be peeled off by hand, and at this time, the container body 2 was not cracked. Further, almost no indentation remained in the area where the ultrasonic horn 10 on the surface of the lid 3 was pressurized.
[0033]
Next, FIGS. 4A and 4B show an ultrasonic horn 10A suitable for the manufacturing method of the present invention. The base end of the ultrasonic horn 10A is attached to an oscillator or the like, but two contact portions 10B and 10B are branched at the tip.
[0034]
When this ultrasonic horn 10A is attached to the welding apparatus, two welding regions α can be simultaneously formed in one container by the branched contact portions 10B and 10B as shown in FIG. Moreover, the ultrasonic vibration of the same conditions can be given to both welding area | region (alpha), and the difference of welding conditions does not arise easily in the welding area | region (alpha) formed in the same container. Further, as shown in FIG. 2, the number of oscillators, boosters, etc. can be reduced as compared with the case where separate ultrasonic horns are used for each welding region.
[0035]
In addition, the welding apparatus which implements the manufacturing method of this invention is not restricted to what feeds the container 1 continuously at a fixed speed, You may intermittently feed.
[0036]
【The invention's effect】
As described above, in the present invention, the container main body and the lid of a foamed resin container such as a natto container can always be partially welded in an optimum state. Since the welded state is stable, the lid can be peeled off with an appropriate force, and the appearance of the welded portion is also improved.
[Brief description of the drawings]
1A is a plan view of a container of the present invention, FIG. 1B is a side view thereof,
FIG. 2 is a front view schematically showing the configuration of a welding apparatus;
FIG. 3 is an enlarged explanatory view for explaining the welding operation in detail;
4A is a front view showing an example of an ultrasonic horn, FIG. 4B is a bottom view thereof,
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Container 2 Container main body 2a Flange part 3 Cover body 5 Matching part 10 Ultrasonic horn 12 Receptacle alpha Welding area

Claims (7)

発泡樹脂製の容器本体と、この容器本体を塞ぐ同じく発泡樹脂製の蓋体とから成り、前記容器本体のフランジ部に前記蓋体が部分溶着されている容器において、
前記フランジ部と蓋体との合わせ面に、発泡樹脂どうしが超音波振動で加熱された溶着領域が形成されており、
前記溶着領域は、その周囲部分で前記発泡樹脂どうしが溶着され、前記周囲部分の内側の中間部分に空隙が形成されていることを特徴とする部分溶着された容器。In a container comprising a container body made of foamed resin and a lid made of the same foamed resin that closes the container body, and the lid body is partially welded to the flange portion of the container body,
A welding region in which foamed resins are heated by ultrasonic vibration is formed on the mating surface of the flange portion and the lid ,
The welded region is a partially welded container characterized in that the foamed resins are welded at a peripheral portion thereof, and a gap is formed in an intermediate portion inside the peripheral portion . 前記フランジ部と蓋体との合わせ面での、発泡樹脂の溶融領域はほぼ円形であり、前記フランジ部と蓋体の厚さの合計をＴとしたときに、前記溶融領域の直径ｄが前記厚さＴの１倍から２倍の範囲である請求項１記載の部分溶着された容器。At mating surfaces of the flange portion and the lid, the melting area of the foamed resin is substantially circular, the total thickness of the flange portion and the lid when T, the diameter d of the melted region is the The partially welded container according to claim 1, wherein the thickness is in the range of 1 to 2 times the thickness T. 発泡樹脂製の容器本体と、この容器本体を塞ぐ同じく発泡樹脂製の蓋体とを、前記容器本体のフランジ部で部分溶着する容器の製造方法において、
前記フランジと蓋体とを重ねて、一方の側にホーンを他方の側に受け台を配置し、前記ホーンを溶着箇所に圧接した状態で、前記ホーンの加圧端面と前記受け台との距離を前記フランジ部と前記蓋体の合計厚さＴよりも短い一定の間隔Ｈに設定し、前記ホーンに超音波振動を印加してフランジ部と蓋体との合わせ面を発熱させ、周囲部分で前記発泡樹脂どうしが溶着され前記周囲部分の内側の中間部分に空隙が形成された溶着領域を形成することを特徴とする容器の製造方法。A container body made of expanded resin, and a lid likewise made of the foamed resin to close the container body, in the manufacturing method of the container that partially welded flange of the container body,
The flange and the lid are overlapped, a horn is placed on one side, a cradle is placed on the other side, and the distance between the pressure end face of the horn and the cradle is in a state where the horn is pressed against the welding location. Is set to a constant interval H shorter than the total thickness T of the flange portion and the lid body, and ultrasonic vibration is applied to the horn to heat the mating surface of the flange portion and the lid body. A method for producing a container, wherein the foamed resins are welded together to form a welded region in which a void is formed in an intermediate portion inside the peripheral portion . 前記間隔Ｈを、前記厚さＴの０．５倍から０．７倍の範囲に設定する請求項３記載の容器の製造方法。The container manufacturing method according to claim 3 , wherein the interval H is set in a range of 0.5 to 0.7 times the thickness T. ホーンは断面が円形で、且つ溶着箇所に当たる先端の周囲がアール形状である請求項３または４記載の容器の製造方法。The method of manufacturing a container according to claim 3 or 4, wherein the horn has a circular cross section and a round shape around the tip of the horn that hits the welding location. ホーンの断面の直径Ｄを、前記厚さＴの１．２倍から２．４倍の範囲に設定する請求項５記載の容器の製造方法。The method for producing a container according to claim 5 , wherein a diameter D of a cross section of the horn is set in a range of 1.2 times to 2.4 times the thickness T. ホーンは先端が複数の当接部に分岐されたものであり、この分岐された個々の当接部により、フランジ部と蓋体との溶着を同時に行う請求項３ないし６のいずれか１項に記載の容器の製造方法。Horn are those tip is branched into a plurality of contact portions, the individual abutment portions which are the branch, to any one of claims 3 performs welding of the flange portion and the lid member at the same time 6 The manufacturing method of the container as described.
JP36243698A 1998-12-21 1998-12-21 Partially welded container and manufacturing method thereof Expired - Lifetime JP4434347B2 (en)

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