JP3637791B2 - Method for producing hollow resin container - Google Patents

Method for producing hollow resin container Download PDF

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Publication number
JP3637791B2
JP3637791B2 JP29514198A JP29514198A JP3637791B2 JP 3637791 B2 JP3637791 B2 JP 3637791B2 JP 29514198 A JP29514198 A JP 29514198A JP 29514198 A JP29514198 A JP 29514198A JP 3637791 B2 JP3637791 B2 JP 3637791B2
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Japan
Prior art keywords
joint
intermediate molded
hollow resin
resin container
molded product
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Expired - Fee Related
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JP29514198A
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JP2000117836A (en
Inventor
洋一 石丸
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Toyota Motor Corp
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Toyota Motor 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
    • B29C66/50—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
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
    • B29C65/1412—Infrared [IR] radiation
    • B29C65/1422—Far-infrared radiation [FIR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1464—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface making use of several radiators
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • 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
    • B29C65/72—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by combined operations or combined techniques, e.g. welding and stitching
    • 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
    • B29C66/1312—Single flange to flange joints, the parts to be joined being rigid
    • 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
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/324—Avoiding burr formation
    • B29C66/3242—Avoiding burr formation on the inside of a tubular or hollow article
    • 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
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • B29C66/91423—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools using joining tools having different temperature zones or using several joining tools with different temperatures
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7172—Fuel tanks, jerry cans

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Thermal Sciences (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は中空樹脂容器の製造方法に係り、特に、自動車に搭載されるフューエルタンク等の中空樹脂容器の製造方法に関する。
【０００２】
【従来の技術】
従来、中空樹脂容器の製造方法の一つとして、分割成形された複数の樹脂製中間成形品を、互いの接合面を溶着することによって中空状の一体に成形する方法があり、その一例を次に説明する。
【０００３】
図１０に示される如く、この中空樹脂容器の製造方法では、中間成形品１００の接合部１００Ａと中間成形品１０２の接合部１０２Ａとを溶融するための熱板１０４が、中間成形品１００、１０２の内側に位置する内側加熱部１０６と、この内側加熱部１０６とＴ字状に交わる接合面加熱部１０８とで構成されている。このため、熱板１０４の接合面加熱部１０８によって、中間成形品１００の接合面１００Ｂと中間成形品１０２の接合面１０２Ｂとの双方を溶融すると共に、熱板１０４の内側加熱部１０６によって、中間成形品１００の内面１００Ｃのうち接合面１００Ｃに隣接する部位１００Ｄと、中間成形品１０２の内面１０２Ｃのうち接合面１０２Ｂに隣接する部位１０２Ｄとの双方を溶融した後、互いの接合面を溶着するようになっている。
【０００４】
【発明が解決しようとする課題】
しかしながら、この様な中空樹脂容器の製造方法では、中間成形品１００の接合部１００Ａと中間成形品１０２の接合部１０２Ａにおいて溶融した樹脂が、上治具１１０と下治具１１２による圧縮によって、容器内側と容器外側の双方に膨出し、溶着部における容器内側の部位に、図１１に示される様な根元部にくびれ１１８を有する小さいバリ１２０が発生する。この結果、中空樹脂容器はこのバリ１２０を起点にして破断し易くなり、溶着強度が低下する。
【０００５】
本発明は上記事実を考慮し、溶着部強度を向上できる中空樹脂容器の製造方法を得ることが目的である。
【０００６】
【課題を解決するための手段】
請求項１記載の本発明は、複数の樹脂製中間成形品の周縁部を重ねて溶着する中空樹脂容器の製造方法であって、
周縁部溶着時に前記複数の樹脂製中間成形品の各接合部の接合面と内側面とを溶融させた後、前記複数の中間成形品の周縁部溶着時に前記複数の樹脂製中間成形品の各接合部を支持する上下治具の一方の治具に他方の治具に向けて立設したシール部を前記他方の治具の外周部の外側に重ね各接合部に圧力をかけることで、圧縮された溶融樹脂を容器内側に流すことにより、溶着部の容器内側のみに凸部を形成することを特徴とする。
【０００９】
従って、製造時に樹脂層の接合部同士を溶着する際に、周縁部溶着時に複数の樹脂製中間成形品の各接合部の接合面と内側面とを溶融させた後、複数の中間成形品の周縁部溶着時に複数の樹脂製中間成形品の各接合部を支持する上下治具の一方の治具に他方の治具に向けて立設したシール部を他方の治具の外周部の外側に重ね各接合部に圧力をかけることで、圧縮された溶融樹脂を容器内側に流すことにより、溶着部の容器内側には凸部が形成されるため、溶着部の容器内側には、根元部にくびれを有する小さなバリが発生しない。この結果、このバリを起点とする溶着部の破断が発生しないため、溶着部強度を向上することができる。
【００１２】
請求項２記載の本発明は、請求項１に記載の中空樹脂容器の製造方法において、前記内側面を溶融する温度を、前記接合面を溶融する温度より高く設定したことを特徴とする。
【００１３】
従って、請求項１記載の内容に加えて、製造時に樹脂層の接合部同士を溶着する際に、樹脂製中間成形品の周縁部の各接合部の内側面を溶融する温度が、接合面を溶融する温度より高くなるため、溶着部の内側面の樹脂が溶融する範囲を広げることができる。この結果、溶着部の容器内側には凸部が形成されるため、溶着部の容器内側には、根元部にくびれを有する小さなバリが発生しない。従って、このバリを起点とする溶着部の破断が発生しないため、溶着部強度を向上することができる。
【００１４】
請求項３記載の本発明は、請求項１に記載の中空樹脂容器の製造方法において、前記樹脂製中間成形品の各接合部の接合面と内側面との境に凹部を形成したことを特徴とする。
【００１５】
従って、請求項１記載の内容に加えて、製造時に樹脂層の接合部同士を溶着する際に、接合部の接合面と内側面との境に凹部を形成したため、溶着部の内側面の樹脂の膨出量を少なくすることができる。この結果、溶着部の容器内側には凸部が形成されるため、溶着部の容器内側には、根元部にくびれを有する小さなバリが発生しない。従って、このバリを起点とする溶着部の破断が発生しないため、溶着部強度を向上することができる。
【００１６】
請求項４記載の本発明は、請求項３記載の中空樹脂容器の製造方法において、複数の樹脂製中間成形品の内周面にシート材を配設し、該シート材の縁部を前記凹部まで延設することを特徴とする。
【００１７】
従って、請求項３記載の内容に加えて、樹脂層の接合部同士を溶着する際に、シート材の縁部を各接合部の間の挟持し、同時に溶着することができる。
【００１８】
【発明の実施の形態】
本発明の第１実施形態に係る中空樹脂容器（本実施形態では、自動車用フューエルタンク）の製造方法を図１〜図６に従って詳細に説明する。
【００１９】
図２に示される如く、本実施形態では、凹状でかつ開口周縁部を有する樹脂製中間成形品１０、１２を溶着プレスするための一対の上治具１４と下治具１６にそれぞれセットする。なお、樹脂製中間成形品１０、１２はそれぞれ射出成形等により成形されており、上側の中間成形品１０には、カットオフバルブ１８等の付属部品が配設されている。
【００２０】
図３に示される如く、カットオフバルブ１８は上部側中間成形品１０と下部側中間成形品１２とからなる中空樹脂容器２０としてのフューエルタンクにインレットパイプ２２を通して燃料を入れていくときフューエルタンク内の上部に溜まる気体を抜くためのパイプであり、燃料がバルブ位置まで上がってくると閉まり、燃料液面がバルブ位置より下にあると開いた状態になる。なお、カットオフバルブ１８から逃がされる気体は、燃料ポンプ装着開口部２４を挿通しているパイプ（図示省略）を通して外部に逃がされるようになっている。
【００２１】
なお、図３に示される如く、下部側中間成形品（フューエルタンク下部品）１２に形成する付属部品であるサブタンク２６及びセパレータ２８は下部側中間成形品成形時に一体成形されている。
【００２２】
図１（Ａ）に示される如く、中間成形品１０の接合部１０Ａと中間成形品１２の接合部１２Ａとは、互いに対向するフランジ部となっており、接合部１０Ａ、１２Ａの容器外側端部には、それぞれ離間する側、即ち、接合部１０Ａでは紙面上側、接合部１２Ａでは紙面下側へ向けて凸部１０Ｂ、１２Ｂが形成されている。
【００２３】
中間成形品１０の接合部１０Ａと中間成形品１２の接合部１２Ａとの間には、熱板３０が配設されており、この熱板３０によって、中間成形品１０の接合部１０Ａと中間成形品１２の接合部１２Ａとの双方を溶融するようになっている。なお、各図面では中間成形品１０、１２の溶融部分を斑点付きハッチングによって示している。
【００２４】
熱板３０の側断面形状はＴ字状となっており、中間成形品１０、１２の内側に位置し、接合部１０Ａ、１２Ａの内側面１０Ｃ、１２Ｃを溶融する立ち壁部３０Ａ、３０Ｂと、この立ち壁部３０Ａ、３０ＢとＴ字状に交わり接合面１０Ｄ、１２Ｄを溶融する水平部３０Ｃとで構成されている。このため、熱板３０を加熱すると、熱板３０の水平部３０Ｃによって、中間成形品１０、１２の接合面１０Ｄ、１２Ｄの双方が溶融すると共に、熱板３０の立ち壁部３０Ａ、３０Ｂによって、接合部１０Ａ、１２Ａの内側面１０Ｃ、１２Ｃがそれぞれ溶融するようになっている。
【００２５】
また、熱板３０の立ち壁部３０Ａ、３０Ｂの温度は、熱板３０の水平部３０Ｃの温度より高くなるように設定されており、接合部１０Ａ、１２Ａの内側面１０Ｃ、１２Ｃにおいて、溶融する樹脂の範囲を広げることができるようになっている。
【００２６】
また、中間成形品１０、１２の接合部１０Ａ、１２Ａの接合面１０Ｄ、１２Ｄと内側面１０Ｃ、１２Ｃとの境には、凹部としての面取り部１０Ｅ、１２Ｅが形成されている。即ち、図４に示される如く、中間成形品１０の接合部１０Ａに面取り部１０Ｅを形成すると共に、図２に示される如く、中間成形品１２の接合部１２Ａに面取り部１２Ｅを形成することで、図５（Ｂ）に示すように、溶着部３５の内側面での樹脂の膨出量Ｓ１が、図５（Ａ）に示すように、面取り部を形成しない場合（図４に二点鎖線で示す形状）の溶着部３５の内側面での樹脂の膨出量Ｓ２に比べ少なくなる。この結果、溶着部３５の内側面に形成される凸部３７周縁のｒ径を大きくすることができる（ｒ１＞ｒ２）。なお、図６に示される如く、面取り部１０Ｅ、１２Ｅを大きくすると所定値までは、溶着部３５の内側面に形成される凸部３７周縁のｒ径が大きくなるようになっている。
【００２７】
図１（Ａ）に示される如く、上治具１４の外周部には、中間成形品１０の接合部１０Ａの根元部近傍を保持する凸部１４Ａと、中間成形品１０の接合部１０Ａの凸部１０Ｂを保持する凹部１４Ｂとが形成されており、凸部１４Ａと凹部１４Ｂとの間では、上治具１４と接合部１０Ａとの間に隙間３１が形成されている。
【００２８】
同様に、下治具１６の外周部には、中間成形品１２の接合部１２Ａの根元部近傍を保持する凸部１６Ａと、中間成形品１２の接合部１２Ａの凸部１２Ｂを保持する凹部１６Ｂとが形成されており、凸部１６Ａと凹部１６Ｂとの間では、下治具１６と接合部１６Ａとの間に隙間３３が形成されている。
【００２９】
また、下治具１６には、凹部１６Ｂの外側部に、上治具１４に向けてシール部１６Ｃが立設しており、図１（Ｂ）に示される如く、中間成形品１０の接合部１０Ａと中間成形品１２の接合部１２Ａとを溶着する際に、上治具１４と下治具１６を接近させると、シール部１６Ｃの先端部が、上治具１４の外周部１４Ｃの外側に重なるようになっている。なお、図１（Ｂ）に符号１５で示す隙間は無くても良い。
【００３０】
次に、本実施形態の作用を説明する。
【００３１】
本実施形態では、熱板３０によって中間成形品１０、１２の接合部１０Ａ、１２Ａの溶融が完了した後に、上治具１４と下治具１６とともに、中間成形品１０と中間成形品１２を離間する方向へ所定距離移動し、熱板３０を容器外方向（図１（Ａ）の矢印Ａ方向）へ引き抜く。その後、上治具１４と下治具１６とともに、中間成形品１０と中間成形品１２を接近する方向（例えば、上治具１４を図１（Ｂ）の矢印Ｂ方向）へ移動し、図１（Ｂ）に示す状態にする。その後、さらに中間成形品１０と中間成形品１２を接近する方向（例えば、上治具１４を図１（Ｃ）の矢印Ｂ方向）へ移動し、図１（Ｃ）に示す状態にする。その後、図１（Ｄ）に示される如く、中空樹脂容器に内圧（図１（Ｄ）の矢印Ｃ）をかけた状態で冷却した後、上治具１４と下治具１６とから中空樹脂容器２０を取り出す。
【００３２】
この際、本実施形態では、下治具１６には、凹部１６Ｂの外側部に、上治具１４に向けてシール部１６Ｃが立設されており、圧縮された樹脂が図１（Ｃ）の矢印Ｗに示される如く、容器の内側のみに流れる。このため、溶着部３５の容器内側には凸部３７が形成されるため、溶着部３５の容器内側には、根元部にくびれを有する小さなバリが発生しない。この結果、このバリを起点とする溶着部３５の破断が発生しないため、溶着部強度を向上することができる。
【００３３】
また、中間成形品１０、１２の接合部１０Ａ、１２Ａの接合面１０Ｄ、１２Ｄと内側面１０Ｃ、１２Ｃとの境には、面取り部１０Ｅ、１２Ｅが形成されている。このため、接合部１０Ａ、１２Ａの内側面１０Ｃ、１２Ｃでの樹脂の膨出量を少なくすることができる。この結果、溶着部３５の内側面に形成される凸部３７周縁のｒ径を大きくすることができる。従って、凸部３７周縁を起点とする破損を低減できるため、溶着部強度を更に向上できる。
【００３４】
また、本実施形態では、熱板３０の立ち壁部３０Ａ、３０Ｂの温度が、熱板３０の水平部３０Ｃの温度より高く設定されている。このため、溶着部３５の内側において、溶融する樹脂の範囲を広げることができるので、溶着部３５の内側面に形成される凸部３７周縁のｒ径を大きくすることができる。従って、凸部３７周縁を起点とする破損を低減でき、溶着部強度を更に向上できる。
【００３５】
なお、熱板３０の立ち壁部３０Ａ、３０Ｂの温度を、熱板３０の水平部３０Ｃの温度より高くする構成の一例としては、図７に示される如く、熱板３０の立ち壁部３０Ａ、３０Ｂを専用に加熱するヒータ４０を追加する構成が考えられる。また、熱板３０の立ち壁部３０Ａ、３０Ｂに代えて、図８に示される如く、内側面１０Ｃ、１２Ｃと非接触に配設する遠赤外線ヒータ４２によって、接合部１０Ａ、１２Ａの内側面１０Ｃ、１２Ｃを加熱する構成としても良い。また、接合部１０Ａ、１２Ａの内側面１０Ｃ、１２Ｃに加えて、接合面１０Ｄ、１２Ｄも遠赤外線ヒータで加熱する構成としても良い。
【００３６】
次に、本発明の中空樹脂容器の製造方法の第２実施形態を図９（Ａ）〜（Ｄ）に従って詳細に説明する。
【００３７】
なお、第１実施形態と同一部材に付いては、同一符号を付してその説明を省略する。
【００３８】
本実施形態では、図９（Ａ）〜（Ｄ）に示される如く、中間成形品１０、１２の内周面に、燃料漏れを防止するためのシート材４６が配設されている。また、これらのシート材４６の縁部４６Ａは、面取り部１０Ｅ、１２Ｅまで延設されており、先端部は、接合面１０Ｄ、１２Ｄに達している。
【００３９】
従って、本実施形態では、第１実施形態の作用に加えて、中間成形品１０、１２の接合部１０Ａ、１２Ａ同士を溶着する際に、シート材４６の縁部４６Ａを各接合部１０Ａ、１２Ａの間の挟持し、同時に溶着することができるため、組付作業性が向上する。
【００４０】
以上に於いては、本発明を特定の実施形態について詳細に説明したが、本発明はかかる実施形態に限定されるものではなく、本発明の範囲内にて他の種々の実施形態が可能であることは当業者にとって明らかである。例えば、前記各実施形態では、中間成形品１０、１２の接合部１０Ａ、１２Ａの接合面１０Ｄ、１２Ｄと内側面１０Ｃ、１２Ｃとの境に、凹部としての面取り部１０Ｅ、１２Ｅを形成したが、面取り部１０Ｅ、１２Ｅに代えて、コーナをＲ形状にする等の他の構成によって凹部を形成しても良い。また、前記各実施形態では、中空樹脂容器２０として自動車のフューエルタンクを例にとったが、中空樹脂容器２０は自動車のフューエルタンクに限定されず他の中空樹脂容器でも良い。また、前記各実施形態では、中空樹脂容器２０が樹脂製中間成形品１０、１２に二分割されているが、中空樹脂容器は３個以上の樹脂製中間成形品に分割されていても良い。
【００４１】
【発明の効果】
請求項１記載の本発明は、複数の樹脂製中間成形品の周縁部を重ねて溶着する中空樹脂容器の製造方法であって、周縁部溶着時に複数の樹脂製中間成形品の各接合部の接合面と内側面とを溶融させた後、複数の中間成形品の周縁部溶着時に複数の樹脂製中間成形品の各接合部を支持する上下治具の一方の治具に他方の治具に向けて立設したシール部を他方の治具の外周部の外側に重ね各接合部に圧力をかけることで、圧縮された溶融樹脂を容器内側に流すことにより、溶着部の容器内側のみに凸部を形成するため、溶着部強度を向上できるという優れた効果を有する。
【００４４】
請求項２記載の本発明は、請求項１に記載の中空樹脂容器の製造方法において、内側面を溶融する温度を、接合面を溶融する温度より高く設定したため、溶着部強度を向上できるという優れた効果を有する。
【００４５】
請求項３記載の本発明は、請求項１に記載の中空樹脂容器の製造方法において、樹脂製中間成形品の各接合部の接合面と内側面との境に凹部を形成したため、溶着部強度を向上できるという優れた効果を有する。
【００４６】
請求項４記載の本発明は、請求項３記載の中空樹脂容器の製造方法において、複数の樹脂製中間成形品の内周面にシート材を配設し、シート材の縁部を凹部まで延設するため、請求項３記載の効果に加えて、組付性が向上するという優れた効果を有する。
【図面の簡単な説明】
【図１】（Ａ）〜（Ｄ）は本発明の第１実施形態に係る中空樹脂容器の製造方法の中間成形品接合工程を順に示した、中空樹脂容器の接合部と装置を示す拡大断面図である。
【図２】本発明の第１実施形態に係る中空樹脂容器の製造方法の中間成形品接合工程の加熱時を示した、中空樹脂容器の接合部と装置を示す断面図である。
【図３】本発明の第１実施形態に係る中空樹脂容器の製造方法で製造された容器を示す分解斜視図である。
【図４】本発明の第１実施形態に係る中空樹脂容器の製造方法における中間成形品の面取り部を示す拡大断面図である。
【図５】（Ａ）は本発明の第１実施形態に係る中空樹脂容器の製造方法における面取り部を形成しない場合の溶着部を示す拡大断面図でおり、（Ｂ）は本発明の第１実施形態に係る中空樹脂容器の製造方法における中空樹脂容器における面取り部を形成した場合の溶着部を示す拡大断面図である。
【図６】本発明の第１実施形態に係る中空樹脂容器の製造方法における面取り部の大きさとｒ径の大きとの関係を示すグラフである。
【図７】本発明の第１実施形態の変形例に係る中空樹脂容器の製造方法の中間成形品接合工程の加熱時を示した、中空樹脂容器の接合部とヒータを示す断面図である。
【図８】本発明の第１実施形態の他の変形例に係る中空樹脂容器の製造方法の中間成形品接合工程の加熱時を示した、中空樹脂容器の接合部とヒータを示す断面図である。
【図９】（Ａ）〜（Ｄ）は本発明の第２実施形態に係る中空樹脂容器の製造方法の中間成形品接合工程を順に示した、中空樹脂容器の接合部と装置を示す拡大断面図である。
【図１０】従来の実施形態に係る中空樹脂容器の製造方法の中間成形品接合工程の加熱時を示した、中空樹脂容器と装置を示す断面図である。
【図１１】従来の実施形態に係る中空樹脂容器の製造方法の中間成形品接合工程における中間成形品の接合部を示す拡大断面図である。
【符号の説明】
１０ 樹脂製中間成形品
１０Ａ 中間成形品の接合部
１０Ｃ 接合部の内側面
１０Ｄ 接合部の接合面
１０Ｅ 接合部の面取り部（凹部）
１２ 樹脂製中間成形品
１２Ａ 中間成形品の接合部
１２Ｃ 接合部の内側面
１２Ｄ 接合部の接合面
１２Ｅ 接合部の面取り部（凹部）
１４ 上治具
１６ 下治具
１６Ｃ 下治具のシール部
２０ 中空樹脂容器
３０ 熱板
３０Ａ 熱板の立ち壁部
３０Ｂ 熱板の立ち壁部
３０Ｃ 熱板の水平部
４０ ヒータ
４２ 遠赤外線ヒータ
４６ シート材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a hollow resin container , and more particularly to a method for manufacturing a hollow resin container such as a fuel tank mounted on an automobile.
[0002]
[Prior art]
Conventionally, as one of the methods for producing a hollow resin container, there is a method of molding a plurality of resin-molded intermediate molded products into a hollow one-piece by welding their joint surfaces. Explained.
[0003]
As shown in FIG. 10, in this method for manufacturing a hollow resin container, a hot plate 104 for melting the joint portion 100 </ b> A of the intermediate molded product 100 and the joint portion 102 </ b> A of the intermediate molded product 102 includes the intermediate molded products 100 and 102. The inner heating unit 106 is located on the inner side, and the inner heating unit 106 and the joining surface heating unit 108 intersecting with the T-shape. Therefore, both the joining surface 100B of the intermediate molded product 100 and the joining surface 102B of the intermediate molded product 102 are melted by the joining surface heating unit 108 of the hot plate 104, and at the same time, After melting both the portion 100D of the inner surface 100C of the molded product 100 adjacent to the joint surface 100C and the portion of the inner surface 102C of the intermediate molded product 102 adjacent to the joint surface 102B, the mutual joint surfaces are welded together. It is like that.
[0004]
[Problems to be solved by the invention]
However, in such a method for manufacturing a hollow resin container, the resin melted at the joint portion 100A of the intermediate molded product 100 and the joint portion 102A of the intermediate molded product 102 is compressed by the upper jig 110 and the lower jig 112, thereby A small burr 120 having a constriction 118 at the root portion as shown in FIG. 11 is generated at a portion inside the container in the welded portion. As a result, the hollow resin container is easily broken starting from the burr 120, and the welding strength is reduced.
[0005]
In view of the above facts, an object of the present invention is to obtain a method for producing a hollow resin container capable of improving the weld strength.
[0006]
[Means for Solving the Problems]
The present invention according to claim 1 is a method for producing a hollow resin container in which peripheral portions of a plurality of resin intermediate molded products are stacked and welded,
After melting the joint surface and the inner side surface of each joint of the plurality of resin intermediate molded products at the peripheral portion welding, each of the plurality of resin intermediate molded products at the peripheral portion welding of the plurality of intermediate molded products in Rukoto pressured into one of the jig toward the other jig seal portion provided upright in the vertical jig to each joint superposed on the outer side of the outer peripheral portion of the other jig for supporting the joint, By flowing the compressed molten resin inside the container, a convex portion is formed only inside the container of the welded portion.
[0009]
Therefore, when welding the joint portions of the resin layers during manufacturing, after melting the joint surface and the inner surface of each joint portion of the plurality of resin intermediate molded products at the time of peripheral edge welding , The seal part erected on one jig of the upper and lower jigs that support each joint part of the plurality of resin intermediate molded products at the time of the peripheral part welding toward the other jig is placed outside the outer peripheral part of the other jig. in Rukoto applying pressure to the joint overlaid by flowing the compressed molten resin into the container interior, since the container inside the welding portion protrusion is formed, the container inside the welding portion, the root portion Small burrs with constriction do not occur. As a result, since the fracture of the welded portion starting from this burr does not occur, the strength of the welded portion can be improved.
[0012]
According to a second aspect of the present invention, in the method for manufacturing a hollow resin container according to the first aspect, a temperature for melting the inner surface is set higher than a temperature for melting the joining surface.
[0013]
Therefore, in addition to the content of claim 1 , the temperature at which the inner surface of each joint portion of the peripheral portion of the resin intermediate molded product is melted when the joint portions of the resin layers are welded together during the manufacturing process. Since the temperature is higher than the melting temperature, the range in which the resin on the inner surface of the welded portion melts can be expanded. As a result, since a convex part is formed inside the container of the welded part, a small burr having a constriction at the root part does not occur inside the container of the welded part. Therefore, since the fracture of the welded portion starting from this burr does not occur, the welded portion strength can be improved.
[0014]
According to a third aspect of the present invention, in the method for manufacturing a hollow resin container according to the first aspect, a concave portion is formed at a boundary between a joint surface and an inner surface of each joint portion of the resin intermediate molded product. And
[0015]
Therefore, in addition to the contents of claim 1, when welding the joint portions of the resin layer during manufacturing, a recess is formed at the boundary between the joint surface and the inner surface of the joint portion, so that the resin on the inner surface of the weld portion The amount of swelling can be reduced. As a result, since a convex part is formed inside the container of the welded part, a small burr having a constriction at the root part does not occur inside the container of the welded part. Therefore, since the fracture of the welded portion starting from this burr does not occur, the welded portion strength can be improved.
[0016]
According to a fourth aspect of the present invention, in the method for manufacturing a hollow resin container according to the third aspect, a sheet material is disposed on an inner peripheral surface of a plurality of resin intermediate molded products, and an edge portion of the sheet material is formed in the concave portion. It is characterized by extending to.
[0017]
Therefore, in addition to the content of Claim 3, when welding the junction parts of a resin layer, the edge part of a sheet | seat material can be clamped between each junction part, and it can weld simultaneously.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
A method for producing a hollow resin container (in this embodiment, a fuel tank for an automobile) according to the first embodiment of the present invention will be described in detail with reference to FIGS.
[0019]
As shown in FIG. 2, in this embodiment, resin intermediate molded products 10 and 12 having a concave shape and an opening peripheral edge are set on a pair of upper jig 14 and lower jig 16 for welding press. The resin intermediate molded products 10 and 12 are each molded by injection molding or the like, and the upper intermediate molded product 10 is provided with accessory parts such as a cut-off valve 18.
[0020]
As shown in FIG. 3, the cut-off valve 18 is disposed in the fuel tank when fuel is introduced into a fuel tank as a hollow resin container 20 composed of an upper intermediate molded product 10 and a lower intermediate molded product 12 through an inlet pipe 22. This pipe is used to remove the gas accumulated in the upper portion of the gas tank, and closes when the fuel reaches the valve position, and opens when the fuel level is below the valve position. The gas released from the cut-off valve 18 is released to the outside through a pipe (not shown) inserted through the fuel pump mounting opening 24.
[0021]
As shown in FIG. 3, the sub tank 26 and the separator 28 that are accessory parts formed on the lower intermediate molded product (fuel tank lower component) 12 are integrally formed when the lower intermediate molded product is molded.
[0022]
As shown in FIG. 1A, the joint portion 10A of the intermediate molded product 10 and the joint portion 12A of the intermediate molded product 12 are flange portions facing each other, and the container outer end portions of the joint portions 10A and 12A. The convex portions 10B and 12B are formed on the sides that are separated from each other, that is, on the bonding portion 10A toward the upper side of the paper surface and on the bonding portion 12A toward the lower surface of the paper surface.
[0023]
A hot plate 30 is disposed between the joint portion 10A of the intermediate molded product 10 and the joint portion 12A of the intermediate molded product 12, and the hot plate 30 allows the joint portion 10A of the intermediate molded product 10 and the intermediate molding to be formed. Both the joint 12A of the product 12 are melted. In each drawing, the melted portions of the intermediate molded products 10 and 12 are indicated by spotted hatching.
[0024]
The side cross-sectional shape of the hot plate 30 is T-shaped, is located on the inner side of the intermediate molded products 10 and 12, and the standing wall portions 30A and 30B for melting the inner side surfaces 10C and 12C of the joint portions 10A and 12A, The standing wall portions 30A and 30B and a horizontal portion 30C that intersects in a T shape and melts the joint surfaces 10D and 12D. For this reason, when the hot plate 30 is heated, both the joining surfaces 10D and 12D of the intermediate molded products 10 and 12 are melted by the horizontal portion 30C of the hot plate 30 and the standing wall portions 30A and 30B of the hot plate 30 are The inner side surfaces 10C and 12C of the joint portions 10A and 12A are melted.
[0025]
The temperature of the standing wall portions 30A and 30B of the hot plate 30 is set to be higher than the temperature of the horizontal portion 30C of the hot plate 30 and melts at the inner side surfaces 10C and 12C of the joint portions 10A and 12A. The range of resin can be expanded.
[0026]
Further, chamfered portions 10E and 12E as concave portions are formed at the boundary between the joint surfaces 10D and 12D of the joint portions 10A and 12A of the intermediate molded products 10 and 12 and the inner side surfaces 10C and 12C. That is, as shown in FIG. 4, the chamfered portion 10E is formed in the joint portion 10A of the intermediate molded product 10, and the chamfered portion 12E is formed in the joint portion 12A of the intermediate molded product 12 as shown in FIG. As shown in FIG. 5 (B), when the bulge amount S1 of the resin on the inner surface of the welded portion 35 does not form a chamfered portion as shown in FIG. 5 (A) (FIG. 4 shows a two-dot chain line). ) And the amount of resin bulge S2 on the inner surface of the welded portion 35. As a result, the r diameter of the periphery of the convex portion 37 formed on the inner surface of the welded portion 35 can be increased (r1> r2). As shown in FIG. 6, when the chamfered portions 10E and 12E are increased, the r diameter of the peripheral edge of the convex portion 37 formed on the inner surface of the welded portion 35 is increased up to a predetermined value.
[0027]
As shown in FIG. 1 (A), on the outer peripheral portion of the upper jig 14, there are a convex portion 14A that holds the vicinity of the root portion of the joint portion 10A of the intermediate molded product 10, and a convex portion of the joint portion 10A of the intermediate molded product 10. A concave portion 14B that holds the portion 10B is formed, and a gap 31 is formed between the upper jig 14 and the joint portion 10A between the convex portion 14A and the concave portion 14B.
[0028]
Similarly, on the outer peripheral portion of the lower jig 16, a convex portion 16A that holds the vicinity of the root portion of the joint portion 12A of the intermediate molded product 12 and a concave portion 16B that holds the convex portion 12B of the joint portion 12A of the intermediate molded product 12 are provided. And a gap 33 is formed between the lower jig 16 and the joint 16A between the convex portion 16A and the concave portion 16B.
[0029]
Further, the lower jig 16 is provided with a seal portion 16C standing on the outer side of the recess 16B toward the upper jig 14, and as shown in FIG. When the upper jig 14 and the lower jig 16 are brought close to each other when welding the joint portion 12A of the intermediate molded product 12 and 10A, the tip portion of the seal portion 16C is placed outside the outer peripheral portion 14C of the upper jig 14. It is supposed to overlap. Note that the gap indicated by reference numeral 15 in FIG.
[0030]
Next, the operation of this embodiment will be described.
[0031]
In the present embodiment, the intermediate molded product 10 and the intermediate molded product 12 are separated together with the upper jig 14 and the lower jig 16 after the melting of the joint portions 10A and 12A of the intermediate molded products 10 and 12 is completed by the hot plate 30. The hot plate 30 is pulled out in the container outward direction (the direction of arrow A in FIG. 1A). Thereafter, together with the upper jig 14 and the lower jig 16, the intermediate molded product 10 and the intermediate molded product 12 are moved in a direction (for example, the upper jig 14 is moved in the direction of arrow B in FIG. 1B). The state shown in FIG. Thereafter, the intermediate molded product 10 and the intermediate molded product 12 are further moved in a direction in which the intermediate molded product 10 and the intermediate molded product 12 approach each other (for example, in the direction of arrow B in FIG. 1C) to obtain the state shown in FIG. Thereafter, as shown in FIG. 1D, the hollow resin container is cooled in a state where an internal pressure (arrow C in FIG. 1D) is applied to the hollow resin container. 20 is taken out.
[0032]
At this time, in the present embodiment, the lower jig 16 is provided with a seal portion 16C on the outer side of the concave portion 16B toward the upper jig 14, and the compressed resin is shown in FIG. As indicated by the arrow W, it flows only inside the container. For this reason, since the convex part 37 is formed inside the container of the welding part 35, the small burr | flash which has a constriction in a root part does not generate | occur | produce inside the container of the welding part 35. FIG. As a result, since the fracture of the welded portion 35 starting from this burr does not occur, the strength of the welded portion can be improved.
[0033]
Further, chamfered portions 10E and 12E are formed at the boundary between the joint surfaces 10D and 12D of the joint portions 10A and 12A of the intermediate molded products 10 and 12 and the inner side surfaces 10C and 12C. For this reason, the amount of swelling of the resin at the inner side surfaces 10C and 12C of the joint portions 10A and 12A can be reduced. As a result, the r diameter of the periphery of the convex portion 37 formed on the inner surface of the welded portion 35 can be increased. Therefore, since the breakage starting from the periphery of the convex portion 37 can be reduced, the welded portion strength can be further improved.
[0034]
In the present embodiment, the temperature of the standing wall portions 30 </ b> A and 30 </ b> B of the hot plate 30 is set higher than the temperature of the horizontal portion 30 </ b> C of the hot plate 30. For this reason, since the range of the resin to be melted can be expanded inside the welded portion 35, the r diameter of the periphery of the convex portion 37 formed on the inner surface of the welded portion 35 can be increased. Therefore, damage starting from the periphery of the convex portion 37 can be reduced, and the welded portion strength can be further improved.
[0035]
In addition, as an example of the configuration in which the temperature of the standing wall portions 30A and 30B of the hot plate 30 is set higher than the temperature of the horizontal portion 30C of the hot plate 30, as shown in FIG. The structure which adds the heater 40 which heats 30B exclusively can be considered. Further, instead of the standing wall portions 30A and 30B of the hot plate 30, as shown in FIG. 8, the far-infrared heater 42 disposed in non-contact with the inner side surfaces 10C and 12C, the inner side surfaces 10C of the joint portions 10A and 12A. , 12C may be heated. In addition to the inner side surfaces 10C and 12C of the joint portions 10A and 12A, the joint surfaces 10D and 12D may be heated by a far infrared heater.
[0036]
Next, 2nd Embodiment of the manufacturing method of the hollow resin container of this invention is described in detail according to FIG. 9 (A)-(D).
[0037]
In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
[0038]
In the present embodiment, as shown in FIGS. 9A to 9D, a sheet material 46 for preventing fuel leakage is disposed on the inner peripheral surfaces of the intermediate molded products 10 and 12. Moreover, the edge part 46A of these sheet | seat materials 46 is extended to the chamfering parts 10E and 12E, and the front-end | tip part has reached joint surface 10D, 12D.
[0039]
Therefore, in the present embodiment, in addition to the operation of the first embodiment, when welding the joint portions 10A and 12A of the intermediate molded products 10 and 12, the edge portion 46A of the sheet material 46 is connected to each joint portion 10A and 12A. As a result, the assembly workability is improved.
[0040]
Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in each of the above embodiments, the chamfered portions 10E and 12E as the concave portions are formed at the boundary between the joint surfaces 10D and 12D of the joint portions 10A and 12A of the intermediate molded products 10 and 12 and the inner side surfaces 10C and 12C. Instead of the chamfered portions 10E and 12E, the concave portions may be formed by other configurations such as a rounded corner. Further, in each of the above embodiments, an automobile fuel tank is taken as an example of the hollow resin container 20, but the hollow resin container 20 is not limited to an automobile fuel tank, and may be another hollow resin container. Moreover, in each said embodiment, although the hollow resin container 20 is divided into two by the resin intermediate molded products 10 and 12, the hollow resin container may be divided | segmented into the 3 or more resin intermediate molded products.
[0041]
【The invention's effect】
The present invention according to claim 1 is a method of manufacturing a hollow resin container in which peripheral portions of a plurality of resin intermediate molded products are stacked and welded, and each of the joint portions of the plurality of resin intermediate molded products is welded at the time of peripheral portion welding. After melting the joint surface and the inner side surface, when welding the peripheral part of the plurality of intermediate molded products, one jig of the upper and lower jigs that support each joint of the plurality of resin intermediate molded products to the other jig in Rukoto applying pressure to the joint overlaid on the outer side of the outer peripheral portion of the other jig seal portion erected toward, by flowing a compressed molten resin into the container interior, only the container inside the welding portion Since a convex part is formed, it has the outstanding effect that the weld part intensity | strength can be improved.
[0044]
The present invention is claimed in claim 2, wherein, excellent as in the production method of the hollow resin container according to claim 1, the temperature for melting the inner surface, since set higher than the temperature for melting the bonding surface, thereby improving the weld portion strength It has the effect.
[0045]
According to the third aspect of the present invention, in the method for manufacturing the hollow resin container according to the first aspect, since the concave portion is formed at the boundary between the joint surface and the inner side surface of each joint portion of the resin intermediate molded product, the welded portion strength is increased. It has the outstanding effect that it can improve.
[0046]
According to a fourth aspect of the present invention, in the method for manufacturing a hollow resin container according to the third aspect, a sheet material is disposed on the inner peripheral surface of the plurality of resin intermediate molded products, and the edge of the sheet material is extended to the recess. Therefore, in addition to the effect of the third aspect , the assembling property is improved.
[Brief description of the drawings]
1 (A) to (D) are enlarged cross-sectional views showing a joint part and a device of a hollow resin container, which sequentially show an intermediate molded product joining step of a method for producing a hollow resin container according to a first embodiment of the present invention. FIG.
FIG. 2 is a cross-sectional view showing a joining portion and a device of a hollow resin container, showing a heating time in an intermediate molded product joining step of the method for producing a hollow resin container according to the first embodiment of the present invention.
FIG. 3 is an exploded perspective view showing a container manufactured by the method for manufacturing a hollow resin container according to the first embodiment of the present invention.
FIG. 4 is an enlarged cross-sectional view showing a chamfered portion of an intermediate molded product in the method for manufacturing a hollow resin container according to the first embodiment of the present invention.
FIG. 5A is an enlarged cross-sectional view showing a welded portion when a chamfered portion is not formed in the method for manufacturing a hollow resin container according to the first embodiment of the present invention, and FIG. It is an expanded sectional view showing a welding part at the time of forming a chamfer in a hollow resin container in a manufacturing method of a hollow resin container concerning an embodiment.
FIG. 6 is a graph showing the relationship between the size of the chamfered portion and the size of the r diameter in the method for manufacturing a hollow resin container according to the first embodiment of the present invention.
FIG. 7 is a cross-sectional view showing a joined portion of a hollow resin container and a heater, showing a heating time of an intermediate molded product joining step of a method for producing a hollow resin container according to a modification of the first embodiment of the present invention.
FIG. 8 is a cross-sectional view showing a joint part and a heater of a hollow resin container, showing a heating time in an intermediate molded product joining step of a method for producing a hollow resin container according to another modification of the first embodiment of the present invention. is there.
FIGS. 9A to 9D are enlarged cross-sectional views showing a joint part and a device of a hollow resin container, which sequentially show an intermediate molded product joining step of a method for producing a hollow resin container according to a second embodiment of the present invention. FIG.
FIG. 10 is a cross-sectional view showing a hollow resin container and an apparatus, showing a heating time in an intermediate molded product joining step of a hollow resin container manufacturing method according to a conventional embodiment.
FIG. 11 is an enlarged cross-sectional view showing a joint portion of an intermediate molded product in an intermediate molded product joining step of a method for manufacturing a hollow resin container according to a conventional embodiment.
[Explanation of symbols]
10 resin intermediate molded product 10A intermediate molded product joint 10C joint internal surface 10D joint joint 10E joint chamfer (concave)
12 resin intermediate molded product 12A intermediate molded product joint 12C joint inner surface 12D joint joint surface 12E joint joint chamfer (concave portion)
14 Upper jig 16 Lower jig 16C Lower jig seal part 20 Hollow resin container 30 Hot plate 30A Hot plate standing wall 30B Hot plate standing wall 30C Hot plate horizontal part 40 Heater 42 Far-infrared heater 46 Sheet Material

Claims (4)

複数の樹脂製中間成形品の周縁部を重ねて溶着する中空樹脂容器の製造方法であって、
周縁部溶着時に前記複数の樹脂製中間成形品の各接合部の接合面と内側面とを溶融させた後、前記複数の中間成形品の周縁部溶着時に前記複数の樹脂製中間成形品の各接合部を支持する上下治具の一方の治具に他方の治具に向けて立設したシール部を前記他方の治具の外周部の外側に重ね各接合部に圧力をかけることで、圧縮された溶融樹脂を容器内側に流すことにより、溶着部の容器内側のみに凸部を形成することを特徴とする中空樹脂容器の製造方法。A method for producing a hollow resin container in which peripheral edges of a plurality of resin intermediate molded products are stacked and welded,
After melting the joint surface and the inner side surface of each joint of the plurality of resin intermediate molded products at the peripheral portion welding, each of the plurality of resin intermediate molded products at the peripheral portion welding of the plurality of intermediate molded products in Rukoto pressured into one of the jig toward the other jig seal portion provided upright in the vertical jig to each joint superposed on the outer side of the outer peripheral portion of the other jig for supporting the joint, A method for producing a hollow resin container, wherein a convex portion is formed only on the inner side of the welded portion of the weld by flowing the compressed molten resin inside the container. 前記内側面を溶融する温度を、前記接合面を溶融する温度より高く設定したことを特徴とする請求項１に記載の中空樹脂容器の製造方法。  The method for producing a hollow resin container according to claim 1, wherein a temperature for melting the inner surface is set higher than a temperature for melting the joining surface. 前記樹脂製中間成形品の各接合部の接合面と内側面との境に凹部を形成したことを特徴とする請求項１に記載の中空樹脂容器の製造方法。  The method for producing a hollow resin container according to claim 1, wherein a concave portion is formed at a boundary between a joint surface and an inner side surface of each joint portion of the resin intermediate molded product. 該シート材の縁部を前記凹部まで延設することを特徴とする請求項３記載の中空樹脂容器の製造方法。  4. The method for producing a hollow resin container according to claim 3, wherein an edge portion of the sheet material is extended to the concave portion.
JP29514198A 1998-10-16 1998-10-16 Method for producing hollow resin container Expired - Fee Related JP3637791B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3049893A1 (en) * 2016-04-12 2017-10-13 Iguatech PROCESS FOR MANUFACTURING A CLOSED SPEED TANK, TOOLING FOR CARRYING OUT SAID METHOD AND TANK OBTAINED

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2973731A1 (en) * 2011-04-11 2012-10-12 Rhodia Operations PROCESS FOR MANUFACTURING RESERVOIRS WITH HIGH BARRIER PROPERTIES TO FLUIDS
KR102504572B1 (en) * 2015-10-26 2023-02-28 엘지이노텍 주식회사 Apparatus of housing component

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3049893A1 (en) * 2016-04-12 2017-10-13 Iguatech PROCESS FOR MANUFACTURING A CLOSED SPEED TANK, TOOLING FOR CARRYING OUT SAID METHOD AND TANK OBTAINED

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