JPS604030A - 高周波溶着方法 - Google Patents

高周波溶着方法

Info

Publication number
JPS604030A
JPS604030A JP58110942A JP11094283A JPS604030A JP S604030 A JPS604030 A JP S604030A JP 58110942 A JP58110942 A JP 58110942A JP 11094283 A JP11094283 A JP 11094283A JP S604030 A JPS604030 A JP S604030A
Authority
JP
Japan
Prior art keywords
electrode
welding
thin wall
high frequency
insulator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP58110942A
Other languages
English (en)
Inventor
Koichi Nakamura
幸一 中村
Masaru Shibata
勝 柴田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Bakelite Co Ltd
Original Assignee
Sumitomo Bakelite Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Bakelite Co Ltd filed Critical Sumitomo Bakelite Co Ltd
Priority to JP58110942A priority Critical patent/JPS604030A/ja
Publication of JPS604030A publication Critical patent/JPS604030A/ja
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • B29C66/5326—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially flat
    • B29C66/53261—Enclosing tubular articles between substantially flat elements
    • B29C66/53262—Enclosing spouts between the walls of bags, e.g. of medical bags
    • 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
    • B29C66/61—Joining from or joining on the inside
    • 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
    • B29C66/63—Internally supporting the article during joining
    • 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8124—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the structure of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81241—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the structure of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps being porous or sintered
    • 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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8187—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects
    • B29C66/81871—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects of the welding jaws
    • 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
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool 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
    • B29C66/70—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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81417—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled being V-shaped

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 高周波溶着法は軟質塩化ビニル樹脂をはじめ、硬質塩化
ビニル樹脂、エチレン−酢酸ビニル共重合樹脂等、高周
波感応性のある熱可塑性樹脂の接合に広く用いられてい
る。高周波接合法は、一般に１５　ＭＨｚから４０　Ｍ
Ｈｚの高周波電流を、出力電極とアース電極の間に置い
た高周波感応性樹脂に流し、内部発熱によシ接合する方
法である。高周波接合加工時に起きるトラブル緯電極間
に生ずるスパークであシ、溶着不良、ピンホール等の発
生原因となシ、電極も損傷を受ける。溶着電極の形状が
比較的単純でかつ平面的な場合は、電極間に平均的に電
流が流れ、スパークを生じにくいが、溶着と同時に溶着
加工物に薄肉部を形成させ、切取線を設けるよう表加工
の場合には、尚該薄肉部に高周波電流が集中するため、
しばしばスパークを生ずる。シート相互の溶着の場合、
このような薄肉部を形成させるのには、シート肉厚よシ
やや低めに突出した刃を取り付け、溶着を行なう方法が
用いられる。この場合スパークの防止には、フッ素樹脂
、フェノール樹脂等の耐熱性プラスチックフィルム又は
薄板あるいは藪紙等の電気絶縁体を電極と相対するアー
ス電極板上に敷く方法が用いられることが多い。
一方押出成形又は射出成形等によシ得られた中空状成形
品とシート状プラスチックを立体的に溶着する場合には
、中空状成形品の内径寸法形状に＃ユは合致したアース
電極を配し、溶着する方法がとられている。この場合、
中空状成形品とシートの接合部の一部に薄肉部を形成さ
せるために、外側の電極に薄肉部に対応する凸部を設け
、アース電極との間隙を狭くし溶着を行なう方法がとら
れている。容易に切シ取シできるためには、この薄肉部
の肉厚は０．３　ｒｒｒｍ以下にすることが望ましいが
、電極凸部とアース電極間に電流が集中し、高率でスパ
ークを生じ実用上製品化が困難である。
本発明者らは電極のスパークしやすい部分を予じめ電気
絶縁体で作成することにより高周波溶着が可能で、かつ
スパークの発生を防止できることを見出し本発明に至っ
た。
以下実施例を図面に従って説明する。
中空状成形品（１）をシート状プラスチック（２）の間
に挿入し、立体溶着部（４）を形成する場合には、第２
図に示すような高周波電極（５）の立体溶着部に対応す
るアース電極（６）を用い、高周波電流を流すことが必
要である。当該立体溶着部に切シ取り用の薄肉部（３）
を得るために、薄肉部形成用凸部（７ａ）を設けたが、
高周波電流は電極間隙の狭い凸部（７ａ）付近に集中し
、しばしばスパークを生じ、ピンホールが生じ、なおか
つ電極を損傷したため、安定した製品を得ることができ
なかった。かかる障害を除くため、本発明者らは、第３
図に示すように薄肉形成用凸部（７ｂ）を電気絶縁体で
あるアルミナ焼結体で作成し、高周波電極（５）と接合
した電極を用いて溶着を行なったところ、スパークを全
く生ずることなく、薄肉部（３）を形成可能であること
を見出した。電流は電極（５）とアース電極（６）との
間に流れるため、薄肉部（３）に相対する凸部絶縁体（
７ｂ）近傍は周囲からの伝熱で十分加熱され、良好な溶
着状態を示し、薄肉部（３）を形成することができた。
他の実施例では、薄肉部形成用凸部（７ａ）に相対する
アース電極（６）に、凸部（７ａ）の先端部よシ広巾で
アルミナによシ厚さ０．５ｍのアース電極絶縁層（８）
を設けた電極を用いた。高周波電流は絶縁層（８）が比
較的薄いために完全には絶縁されず、一部が流れるため
、良好な溶着状態が得られ、薄肉部（３）を形成するこ
とができる。絶縁層の好ましい厚さは、１溶着に必要な
電流値によシ異なるかい一絶縁層を作成する精度も考慮
に入れると、０．１ｍｎ以上が必要で、ｏ、２ｔｐａか
ら１ｍの厚みが好ましい。厚すぎる場合は電流が弱くな
り、溶着が不完全となる。
以上の実施例では電極（５）かアース電極（６）のいず
れかに絶縁体を用いたが、双方に用いても良く、凸部絶
縁体（７ｂ）は第３図に示すような板状でなく、アース
電極と同様に層状であってもよい。文月いる絶縁体は、
アルミナのほか、炭化ケイ素、チッ化ケイ素、酸化クロ
ム等の焼結体（いわゆるセラミックス）、あるいはフッ
素樹脂、ポリイミド樹脂等の耐熱性プラスチックが適す
るが、耐久性の点で特にセラミックスが好結果であった
。
【図面の簡単な説明】
第１固 溶着部の断面図、 第２図は従来技術による溶着法を示す高周波電極の側面
図、 第３図は本実施例による溶着法を示す高周波電極の側面
図を示す。 図中、 １は成形品、 ２はシート状プラスチック、 ３は薄肉部、 ４は立体溶着部、 ５は高周波電極、 ６はアース電極、 ７ａｔ／′ｉ薄肉部形成用凸部、 ７ｂは薄肉部形成用凸部絶縁体、 ８はアース電極絶縁層 を示す。 特許出願人　住友ベークライト株式会社第１図 第２図 第３図 ＝１６５−

Claims (1)

    【特許請求の範囲】
  1. プラスチック中空状成形品と、プラスチックシート又は
    成形品を高周波溶着するとともに、部分的に薄肉部を形
    成する方法であって、該薄肉部に対応する凸部を有する
    電極と中空状成形品の内部に挿入する棒状電極を用い、
    該電極の一方又は双方の一部又は表面に電気絶縁体を配
    して溶着することを特徴とする高周波溶着方法
JP58110942A 1983-06-22 1983-06-22 高周波溶着方法 Pending JPS604030A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58110942A JPS604030A (ja) 1983-06-22 1983-06-22 高周波溶着方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58110942A JPS604030A (ja) 1983-06-22 1983-06-22 高周波溶着方法

Publications (1)

Publication Number Publication Date
JPS604030A true JPS604030A (ja) 1985-01-10

Family

ID=14548463

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58110942A Pending JPS604030A (ja) 1983-06-22 1983-06-22 高周波溶着方法

Country Status (1)

Country Link
JP (1) JPS604030A (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4900389A (en) * 1986-10-10 1990-02-13 Baxter Travenol Laboratories, Inc. Method of sealing an article via radio frequency
JPH02281927A (ja) * 1989-04-24 1990-11-19 Shiigeru:Kk 高周波溶着用金型
US5466322A (en) * 1993-02-04 1995-11-14 Baxter International Inc. Method for making an elongated plastic member assembly
US5840151A (en) * 1993-02-04 1998-11-24 Baxter International Inc. Apparatus and dies for forming peelable tube assemblies

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5828329A (ja) * 1981-07-30 1983-02-19 Kazuichi Nishino 硬質熱可塑性合成樹脂薄板と軟質熱可塑性合成樹脂シ−トとの高周波熔着法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5828329A (ja) * 1981-07-30 1983-02-19 Kazuichi Nishino 硬質熱可塑性合成樹脂薄板と軟質熱可塑性合成樹脂シ−トとの高周波熔着法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4900389A (en) * 1986-10-10 1990-02-13 Baxter Travenol Laboratories, Inc. Method of sealing an article via radio frequency
JPH02281927A (ja) * 1989-04-24 1990-11-19 Shiigeru:Kk 高周波溶着用金型
US5466322A (en) * 1993-02-04 1995-11-14 Baxter International Inc. Method for making an elongated plastic member assembly
US5840151A (en) * 1993-02-04 1998-11-24 Baxter International Inc. Apparatus and dies for forming peelable tube assemblies

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