JPS6239091B2 - - Google Patents

Info

Publication number
JPS6239091B2
JPS6239091B2 JP55040601A JP4060180A JPS6239091B2 JP S6239091 B2 JPS6239091 B2 JP S6239091B2 JP 55040601 A JP55040601 A JP 55040601A JP 4060180 A JP4060180 A JP 4060180A JP S6239091 B2 JPS6239091 B2 JP S6239091B2
Authority
JP
Japan
Prior art keywords
heat
sheet
shrinkable
plate
shaped core
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.)
Expired
Application number
JP55040601A
Other languages
English (en)
Other versions
JPS56136329A (en
Inventor
Koji Suzuki
Yukyoshi Kaneki
Yasuhiro Moryama
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.)
Nitto Denko Corp
Original Assignee
Nitto Electric Industrial 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 Nitto Electric Industrial Co Ltd filed Critical Nitto Electric Industrial Co Ltd
Priority to JP4060180A priority Critical patent/JPS56136329A/ja
Publication of JPS56136329A publication Critical patent/JPS56136329A/ja
Publication of JPS6239091B2 publication Critical patent/JPS6239091B2/ja
Granted 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
    • 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/49—Internally supporting the, e.g. tubular, 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7371—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable
    • B29C66/73715—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable heat-shrinkable
    • 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
    • B29C66/81421—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 convex or concave
    • B29C66/81422—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 convex or concave being convex
    • 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
    • B29C66/81421—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 convex or concave
    • B29C66/81423—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 convex or concave being concave
    • 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
    • B29C66/91411—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 parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • 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
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • 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
    • B29C66/83—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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/929—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools characterized by specific pressure, force, mechanical power or displacement values or ranges
    • 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
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/949—Measuring or controlling the joining process by measuring or controlling the time characterised by specific time values or ranges

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】
本発明は熱収縮性チユーブの製造法に関するも
のである。 加熱することにより径或いは径と長さの双方が
収縮し得る熱収縮性チユーブは、例えば鋼管接続
部、ケーブル接続部の被覆等に用いられている。 而して、かような熱収縮性チユーブの製造法と
しては、熱収縮性シートを円筒状型体に所定回数
巻き付け、巻き終り端を仮着した後該シートの融
点以上の温度に加熱し、シート同志を一体化せし
めてチユーブ状とし、次いで円筒状型体から抜き
取る方法が知られている。 この方法は熱収縮性シートを加熱して溶融状態
にしめ該シート中に生ずる熱収縮力によりシート
同志を一体化するものである。ところが、この場
合シートは円筒状型体でその熱収縮を規制される
ため、シート間に作用する力は小さく、その結
果、シート間の層間強度の大きな熱収縮チユーブ
が得られず、またシート間に微小なエアーボイド
が形成され易いという問題がある。 シート間の層間強度の小さな熱収縮性チユーブ
を用いて鋼管等を被覆すると層間剥離を生じ満足
な被覆層が形成され難い。また、エアーボイドを
包含した熱収縮性チユーブを熱収縮せしめて形成
される被覆層は、該エアーボイドに水が滞留し、
鋼管等の腐食を招来し易い。 更に、従来法において目的とする熱収縮性チユ
ーブの径に応じた円筒状型体を用意しておかなけ
ればならず、該型体の保管スペースの問題もあ
る。 本発明は上記従来法の有する問題を解決した熱
収縮性チユーブの製造法に係り、熱収縮性シート
を耐熱性の板状芯体に少なくとも１回巻き付け、
次いで該熱収縮性シートを加熱加圧しシート同志
を熱圧着により一体化させた後、板状芯体を取り
除くことを特徴とするものである。 本発明において用いられる熱収縮性シートは、
ポリエチレン、ポリプロピレン、ポリ塩化ビニ
ル、エチレン―酢酸ビニル共重合体等の熱可塑性
プラスチツク、天然ゴム、シリコーンゴム、ブチ
ルゴム、エチレン―プロピレン共重合体ゴム等の
ゴム或いはこれらの混合物に所望により老化防止
剤、充填剤、着色剤等の添加剤を適量配合して成
るものであり、例えばこれらの成分を均一に混合
してシート状に成形した後必要に応じて架橋し、
次いで熱延伸加工を施してその長さを増加せしめ
て熱収縮性を付与して得られ、厚さは通常約0.05
〜0.6mm程度のものである。なお、上記延伸は少
なくとも１方向に行なわれ、延伸率は通常約10〜
400％程度である。 本発明においては、先ず、例えば第１図に示す
ように金属、合成樹脂等の耐熱性材料から成る板
状芯体１上に熱収縮性シート２が所定回数巻き付
けられる。熱収縮性シートの板状芯体への巻き付
け回数は、目的とする熱収縮性チユーブの肉厚と
シート厚みの兼ね合いにより決定する。 上記熱収縮性シートの板状芯体への巻き付けに
際し、シートが１方向に延伸されたもの（１方向
に熱収縮し得るもの）であるときは、該シートの
延伸方向が、得られるチユーブの周方向と一致す
るように芯体に巻き付けるようにする。 本発明においては熱収縮性シートを板状芯体に
直接巻き付けてもよいが、シート間の層間強度を
より向上させるため、予めホツトメルト接着剤の
ような接着剤層を少なくとも片面に設けた熱収縮
性シートを用い、このシートを板状芯体に巻き付
けたり、熱収縮性シートの少なくとも片面に接着
シートを重ね合わせて板状芯体に巻き付けること
ができる。 また、接着シートを板状芯体に巻き付け、次い
で熱収縮性シートを巻き付けるようにすれば、内
周面に接着剤層を有する熱収縮性チユーブを得る
ことができる。 本発明においては、板状芯体の表面にフツ素樹
脂、シリコーン樹脂を塗布したりフツ素樹脂シー
トを巻き付けるようにして、板状芯体に剥離機能
を付与しておけば、チユーブ成形後の板状芯体の
取り除き作業のために好ましい。 また、熱収縮性シートの不用意な巻き解けを防
止するため、巻き終り端を接着剤、接着テープ等
で仮着しておくのがよい。 上記のようにして板状芯体に巻き付けられた熱
収縮性シートは、次いで軟化点以上好ましくは融
点以上の温度に加熱せられると同時に加圧されて
熱圧着により一体化されチユーブ状に成形され
る。この際の圧力および加熱時間は、熱収縮性シ
ートの厚さ、板状芯体への巻付け回数等に応じて
設定するが、通常圧力は約10〜100Kg／cm2、加熱
時間は約10〜60分程度である。 板状芯体上に巻き付けられた熱収縮性シートの
熱圧着によるチユーブ成形は、例えば第２図に示
すように２枚のプレス板３，３′を配置せしめ、
これらをプレス機に導いて行なうことができる。 このようにして板状芯体に巻き付けられた熱収
縮性シートを加熱加圧すれば、該シートは互に熱
圧着により一体化しチユーブ状となるので、これ
を冷却して板状芯体を取り除けば、目的とする熱
収縮性チユーブが得られる。 なお、第２図に示すような熱収縮性シートの熱
圧着時に、板状芯体１の両側面上に位置する熱収
縮性シートの部分Ａ，Ｂの層間強度の一層の向上
のために、板状芯体１を取り除いた後、得られた
チユーブ５の前記Ａ，Ｂ部分相当部を例えば第３
図に示すように更に２枚のプレス板４，４′によ
り加熱加圧せしめるのが好適である。 本発明は上記のように構成されており、熱収縮
性シートの一体化を加熱加圧条件下で行なうた
め、層間強度が大きく、しかもエアーボイドの無
い熱収縮性チユーブが得られる。また、製造作業
も容易であり、更に芯体は板状であるのでその保
管スペースも筒状型体を用いる従来技術に比べは
るかに狭くてもよい等の特徴を有する。 以下、実施例により本発明を更に詳細に説明す
る。 実施例 １ 比重0.935、MI0.24、軟化点90℃のポリエチレ
ン（三菱油化社製、商品名ユカロンEC―40）を
押出装置を用いて厚さ0.6mmの長尺シートに成形
し、次いで電子線照射装置により12メガラツドの
電子線を照射し架橋する。 この架橋された長尺ポリエチレンシートを１軸
延伸装置により温度160℃において、長尺方向に
延伸率が50％になるように延伸し、厚さ0.3mmの
延伸ポリエチレンシートを得る。 次いで、延伸ポリエチレンシートを表面にポリ
テトラフルオロエチレン樹脂を塗布して剥離処理
した厚さ１mm、幅100mm、長さ2090mmの鋼鉄製板
状芯体上に２回巻き付け（シートの延伸方向が芯
体の幅方向と一致するように巻き付ける）、巻き
終り端を接着テープにより下層の延伸ポリエチレ
ンシートに仮着する。 その後、第２図に示すように２枚のプレス板を
配置せしめ、温度150℃、圧力50Kg／cm2の条件で
30分間加熱加圧して、延伸ポリエチレンシート同
志を一体化させ、室温（25℃）まで冷却した後板
状芯体を取り除き、肉厚0.6mm内径665mmの熱収縮
性チユーブ（試料番号１）を得た。 この熱収縮性チユーブの径方向の熱収縮率およ
び層間強度を測定して得た結果を第１表に示す。 なお、熱収縮率はチユーブを熱収縮自由な状態
で200℃に15分間加熱した後、その内径を測定
し、下記の式によつて算出した値である。 熱収縮率（％）＝（熱収縮前の内径）―（熱収縮後の内径）／熱収縮前の内径×100 また、層間強度は引張試験機を用い温度25±２
℃、引張り速度50mm／minの条件で層間を引張
り、剥離するに要する力を測定した。 実施例 ２ 実施例１において用いた延伸ポリエチレンシー
トの片面に厚さ0.1mm、軟化点45℃、酢酸ビニル
含量25重量％のエチレン―酢酸ビニル共重合体か
ら成るホツトメルト接着剤層が内層になるように
板状芯体に２回巻き付ける以外は、全て試料番号
１の場合と同様に作業し、肉厚1.2mm、内径665mm
の熱収縮性チユーブ（試料番号２）を得た。 この熱収縮性チユーブの特性を第１表に示す。 比較例 １ 実施例１の延伸ポリエチレンシートを用い、こ
のシートを外径660mmの鋼鉄製円筒状型体（外周
面をポリテトラフルオロエチレン樹脂の塗布によ
り剥離処理したもの）に２回巻き付け、その巻き
終り端を接着テープで仮着する。 次に、温度160℃で100分間加熱して一体化し、
室温まで冷却後円筒状型体から抜き取り、肉厚
0.6mm、内径665mmの熱収縮性チユーブ（試料番号
３）を得た。このチユーブの特性を第１表に併記
する。 比較例 ２ 実施例２で用いたホツトメルト接着剤層付きの
延伸ポリエチレンシートを用い、該接着剤層が内
層になるようにして円筒状型体に巻き付ける以外
は、全て比較例１の場合と同様に作業し、肉厚
1.2mm、内径665mmの熱収縮性チユーブ（試料番号
４）を得た。このチユーブの特性を第１表に併記
する。
【表】 上記第１表から明らかなように、本発明の製造
法により得られる熱収縮性チユーブは、円筒状型
体を用いる従来法によつて得られるチユーブより
も、層間強度が大巾に向上していることが判る。
【図面の簡単な説明】
第１〜３図はいずれも本発明に係る熱収縮性チ
ユーブの製造法の工程の実例を示す概略図であ
る。 １……板状芯体、２……熱収縮性シート、３，
３′，４，４′……プレス板、５……熱収縮性チユ
ーブ。

Claims (1)

    【特許請求の範囲】
  1. １ 熱収縮性シートを耐熱性の板状芯体に少なく
    とも１回巻付け、次いで該熱収縮性シートを加熱
    加圧しシート同志を熱圧着により一体化させた
    後、板状芯体を取り除くことを特徴とする熱収縮
    性チユーブの製造法。
JP4060180A 1980-03-28 1980-03-28 Production of heat-shrinkable tube Granted JPS56136329A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4060180A JPS56136329A (en) 1980-03-28 1980-03-28 Production of heat-shrinkable tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4060180A JPS56136329A (en) 1980-03-28 1980-03-28 Production of heat-shrinkable tube

Publications (2)

Publication Number Publication Date
JPS56136329A JPS56136329A (en) 1981-10-24
JPS6239091B2 true JPS6239091B2 (ja) 1987-08-21

Family

ID=12585026

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4060180A Granted JPS56136329A (en) 1980-03-28 1980-03-28 Production of heat-shrinkable tube

Country Status (1)

Country Link
JP (1) JPS56136329A (ja)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52128974A (en) * 1976-04-23 1977-10-28 Nippon Petrochemicals Co Ltd Process for making thermoplastic moldings

Also Published As

Publication number Publication date
JPS56136329A (en) 1981-10-24

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