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
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
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。
The present invention relates to a method for manufacturing a heat-shrinkable tube. Heat-shrinkable tubes whose diameter or both diameter and length can be shrunk by heating are used, for example, to cover steel pipe joints and cable joints. The method for manufacturing such a heat-shrinkable tube is to wrap a heat-shrinkable sheet around a cylindrical body a predetermined number of times, temporarily attach the end of the winding, and then heat the sheet to a temperature higher than the melting point of the sheet. A method is known in which the sheets are integrated into a tube shape and then extracted from a cylindrical mold. In this method, a heat-shrinkable sheet is heated to melt it, and the sheets are integrated by the heat-shrinkage force generated in the sheet. However, in this case, the sheet is cylindrical and its heat shrinkage is restricted, so the force acting between the sheets is small, and as a result, a heat-shrinkable tube with high interlaminar strength between the sheets cannot be obtained, and the There is a problem in that minute air voids are likely to be formed. When a heat-shrinkable tube having low interlayer strength between sheets is used to cover a steel pipe or the like, interlayer peeling occurs and it is difficult to form a satisfactory coating layer. In addition, the coating layer formed by heat-shrinking a heat-shrinkable tube containing air voids has the effect that water stays in the air voids,
This can easily lead to corrosion of steel pipes, etc. Furthermore, in the conventional method, a cylindrical mold body must be prepared in accordance with the diameter of the intended heat-shrinkable tube, and there is also the problem of storage space for the mold body. The present invention relates to a method for manufacturing a heat-shrinkable tube that solves the problems of the conventional method described above, and includes the steps of: wrapping a heat-shrinkable sheet around a heat-resistant plate-shaped core at least once;
The heat-shrinkable sheet is then heated and pressurized to integrate the sheets together by thermocompression bonding, and then the plate-shaped core is removed. The heat-shrinkable sheet used in the present invention is
Thermoplastic plastics such as polyethylene, polypropylene, polyvinyl chloride, ethylene-vinyl acetate copolymer, rubbers such as natural rubber, silicone rubber, butyl rubber, ethylene-propylene copolymer rubber, or mixtures thereof, optionally containing anti-aging agents, It is made by blending appropriate amounts of additives such as fillers and colorants. For example, these components are mixed uniformly and formed into a sheet, and then crosslinked as necessary.
It is then hot-stretched to increase its length and give it heat-shrinkability, and its thickness is usually about 0.05 mm.
~0.6mm. Note that the above-mentioned stretching is performed in at least one direction, and the stretching ratio is usually about 10 to
It is about 400%. In the present invention, first, as shown in FIG. 1, for example, a heat-shrinkable sheet 2 is wound a predetermined number of times around a plate-shaped core 1 made of a heat-resistant material such as metal or synthetic resin. The number of times the heat-shrinkable sheet is wound around the plate-like core is determined by the balance between the desired wall thickness of the heat-shrinkable tube and the sheet thickness. When winding the above-mentioned heat-shrinkable sheet around the plate-shaped core, if the sheet is stretched in one direction (can be heat-shrinked in one direction), the direction in which the sheet is stretched is the direction of the tube to be obtained. Make sure to wrap it around the core so that it matches the circumferential direction. In the present invention, the heat-shrinkable sheet may be wrapped directly around the plate-shaped core, but in order to further improve the interlaminar strength between the sheets, the heat-shrinkable sheet is coated with an adhesive layer such as a hot melt adhesive on at least one side in advance. This sheet can be wrapped around a plate-shaped core using a heat-shrinkable sheet, or an adhesive sheet can be superimposed on at least one side of a heat-shrinkable sheet and the sheet can be wrapped around a plate-shaped core. Furthermore, by wrapping an adhesive sheet around a plate-shaped core body and then wrapping a heat-shrinkable sheet around the core, a heat-shrinkable tube having an adhesive layer on the inner peripheral surface can be obtained. In the present invention, if a peeling function is imparted to the plate-shaped core by coating the surface of the plate-shaped core with a fluororesin or silicone resin or wrapping a fluororesin sheet, it is possible to Preferred for removing plate-like cores. Furthermore, in order to prevent the heat-shrinkable sheet from unrolling inadvertently, it is preferable to temporarily attach the end of the roll with adhesive, adhesive tape, or the like. The heat-shrinkable sheet wound around the plate-shaped core as described above is then heated to a temperature higher than the softening point, preferably higher than the melting point, and simultaneously pressurized to be integrated by thermocompression bonding and formed into a tube shape. Ru. The pressure and heating time at this time are set depending on the thickness of the heat-shrinkable sheet, the number of times it is wrapped around the plate-shaped core, etc., but the usual pressure is about 10 to 100 Kg/cm 2 and the heating time is about 10 ~60 minutes. To form a tube by thermocompression bonding of a heat-shrinkable sheet wound around a plate-shaped core, for example, two press plates 3 and 3' are arranged as shown in FIG.
These can be conducted by introducing them into a press. If the heat-shrinkable sheet wrapped around the plate-shaped core is heated and pressurized in this way, the sheets will be integrated with each other by thermo-compression bonding to form a tube shape, which can then be cooled and the plate-shaped core removed. In this case, the desired heat-shrinkable tube can be obtained. In addition, during thermocompression bonding of the heat-shrinkable sheet as shown in FIG. After removing the plate-shaped core 1, the portion corresponding to the A and B portions of the obtained tube 5 is
As shown in the figure, it is preferable to further apply heat and pressure using two press plates 4, 4'. The present invention is constructed as described above, and since the heat-shrinkable sheets are integrated under heating and pressurizing conditions, a heat-shrinkable tube with high interlaminar strength and without air voids can be obtained. Further, the manufacturing operation is easy, and since the core body is plate-shaped, the storage space thereof can be much narrower than in the prior art using a cylindrical body. Hereinafter, the present invention will be explained in more detail with reference to Examples. Example 1 Polyethylene (manufactured by Mitsubishi Yuka Co., Ltd., trade name: Yucalon EC-40) with a specific gravity of 0.935, MI of 0.24, and a softening point of 90°C was formed into a long sheet with a thickness of 0.6 mm using an extrusion device, and then an electronic Crosslinking is achieved by irradiating 12 megarad electron beams using a beam irradiation device. This crosslinked long polyethylene sheet is stretched in the longitudinal direction using a uniaxial stretching device at a temperature of 160° C. to a stretching ratio of 50% to obtain a stretched polyethylene sheet with a thickness of 0.3 mm. Next, the stretched polyethylene sheet is wrapped twice around a steel plate-like core with a thickness of 1 mm, width of 100 mm, and length of 2090 mm, which has been coated with polytetrafluoroethylene resin and treated with peeling. (wrap it so that it matches the width direction of the roll) and temporarily attach the end of the winding to the lower stretched polyethylene sheet using adhesive tape. After that, two press plates were arranged as shown in Figure 2, and the temperature was 150℃ and the pressure was 50Kg/ cm2 .
Heat and pressure was applied for 30 minutes to integrate the stretched polyethylene sheets, and after cooling to room temperature (25°C), the plate-shaped core was removed to obtain a heat-shrinkable tube (sample number 1) with a wall thickness of 0.6 mm and an inner diameter of 665 mm. Ta. Table 1 shows the results obtained by measuring the radial heat shrinkage rate and interlaminar strength of this heat-shrinkable tube. The heat shrinkage rate is a value calculated by the following formula after heating the tube at 200° C. for 15 minutes in a state where it is free from heat shrinkage, and then measuring its inner diameter. Heat shrinkage rate (%) = (inner diameter before heat shrinkage) - (inner diameter after heat shrinkage) / inner diameter before heat shrinkage x 100 In addition, the interlaminar strength was measured using a tensile tester at a temperature of 25 ± 2
The force required to separate the layers by pulling the layers apart was measured at a temperature of 50 mm/min at a pulling speed of 50 mm/min. Example 2 On one side of the stretched polyethylene sheet used in Example 1, a hot melt adhesive layer consisting of an ethylene-vinyl acetate copolymer having a thickness of 0.1 mm, a softening point of 45°C, and a vinyl acetate content of 25% by weight was placed as an inner layer. The work was done in the same way as for sample number 1, except for wrapping it twice around the plate-shaped core.
A heat-shrinkable tube (sample number 2) was obtained. The properties of this heat-shrinkable tube are shown in Table 1. Comparative Example 1 Using the stretched polyethylene sheet of Example 1, this sheet was wound twice around a steel cylindrical mold with an outer diameter of 660 mm (the outer circumferential surface of which had been peeled off by applying polytetrafluoroethylene resin), and the Temporarily attach the end with adhesive tape. Next, heat it for 100 minutes at a temperature of 160℃ to integrate it.
After cooling to room temperature, it is extracted from the cylindrical mold and the wall thickness is
A heat-shrinkable tube (sample number 3) with a diameter of 0.6 mm and an inner diameter of 665 mm was obtained. The characteristics of this tube are also listed in Table 1. Comparative Example 2 All procedures were carried out in the same manner as in Comparative Example 1, except that the stretched polyethylene sheet with the hot melt adhesive layer used in Example 2 was used and wrapped around a cylindrical body with the adhesive layer as the inner layer. work and thick
A heat-shrinkable tube (sample number 4) having an inner diameter of 1.2 mm and an inner diameter of 665 mm was obtained. The characteristics of this tube are also listed in Table 1.
【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。[Table] As is clear from Table 1 above, the heat-shrinkable tube obtained by the manufacturing method of the present invention has much greater interlaminar strength than the tube obtained by the conventional method using a cylindrical mold. It can be seen that it is improving.
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。
1 to 3 are schematic diagrams showing an example of the process for manufacturing a heat-shrinkable tube according to the present invention. 1...Plate core, 2...Heat-shrinkable sheet, 3,
3', 4, 4'...Press plate, 5...Heat shrinkable tube.
Claims (1)
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。1 Wrap a heat-shrinkable sheet around a heat-resistant plate-shaped core at least once, then heat and press the heat-shrinkable sheet to integrate the sheets by thermocompression bonding, and then remove the plate-shaped core. Features: A manufacturing method for heat-shrinkable tubes.
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 (en) | 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 (en) |
Family Cites Families (1)
| 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 |
-
1980
- 1980-03-28 JP JP4060180A patent/JPS56136329A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56136329A (en) | 1981-10-24 |
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