JPS5815298B2 - Method for manufacturing heat-shrinkable tube with bellows structure - Google Patents

Method for manufacturing heat-shrinkable tube with bellows structure

Info

Publication number
JPS5815298B2
JPS5815298B2 JP52067698A JP6769877A JPS5815298B2 JP S5815298 B2 JPS5815298 B2 JP S5815298B2 JP 52067698 A JP52067698 A JP 52067698A JP 6769877 A JP6769877 A JP 6769877A JP S5815298 B2 JPS5815298 B2 JP S5815298B2
Authority
JP
Japan
Prior art keywords
tube
heat
bellows structure
core
material tube
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
JP52067698A
Other languages
Japanese (ja)
Other versions
JPS543171A (en
Inventor
山下昇
森山康弘
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 JP52067698A priority Critical patent/JPS5815298B2/en
Publication of JPS543171A publication Critical patent/JPS543171A/en
Publication of JPS5815298B2 publication Critical patent/JPS5815298B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (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】 本発明はベローズ構造を有する熱収縮性チューブの製造
法に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a heat-shrinkable tube having a bellows structure.

各種物品、例えば石油、化学薬品、水、ガス等の輸送管
における防食、防水、電気絶縁等のための被覆処理は、
輸送管に粘着テープ、ジュートを巻回する方法、または
直管状熱収縮性チューブを輸送管に挿入して熱収縮させ
る方法、等により行な いる。
Coating treatment for corrosion protection, waterproofing, electrical insulation, etc. for transportation pipes for various goods such as petroleum, chemicals, water, gas, etc.
This can be done by wrapping adhesive tape or jute around the transport pipe, or by inserting a straight heat-shrinkable tube into the transport pipe and shrinking it by heat.

しかしながら、輸送管がL字状、鋭角状に屈曲している
場合、或いは曲率半径の小さな湾曲状をしている場合に
は、前者の方法では粘着テープ、ジュートを緊密に巻回
するのが極めて困難で作業能率が悪く、しかも被覆処理
効果も不充分であり、後者の方法では輸送管に直管状熱
収縮性チューブを挿入するのが困難で、無理に挿入しよ
うとすればチューブが損傷或いは破損してしまう。
However, if the transport pipe is L-shaped, bent at an acute angle, or curved with a small radius of curvature, it is extremely difficult to tightly wrap the adhesive tape or jute in the former method. In the latter method, it is difficult to insert the straight heat-shrinkable tube into the transport pipe, and if you try to forcefully insert it, the tube will be damaged or broken. Resulting in.

本発明は上記従来の問題を一挙に解決するためのベロー
ズ構造を有する熱収縮性チューブを容易に製造すること
を目的としてなされたものである。
The present invention has been made for the purpose of easily manufacturing a heat-shrinkable tube having a bellows structure in order to solve the above-mentioned conventional problems at once.

即ち、本発明は熱可塑性プラスチック、ゴム或いはこれ
らの混合物から成るチューブ状物を熱拡大加工せしめて
熱収縮性を有する材料チューブを得、この材料チューブ
を最小外径が前記チューブ状物の内径よりも大きく且つ
外周面にベローズ構造を有する芯体上に挿入し、次いで
材料チューブを熱収縮適温に加熱し、芯体外周面の形状
に沿わし且つ物品に挿入後の加熱により前記チューブ状
物の形状に回復し得る熱収縮応力を残存せしめるように
熱収縮させて、材料チューブに芯体のベローズ構造を転
写形成させて冷却した後、前記芯体を取り除くことを特
徴とするものである。
That is, the present invention heat-expands a tube-like material made of thermoplastic plastic, rubber, or a mixture thereof to obtain a heat-shrinkable material tube, and the material tube has a minimum outer diameter smaller than the inner diameter of the tube-like material. The material tube is inserted onto a core body which is large in size and has a bellows structure on its outer circumferential surface, and then the material tube is heated to an appropriate temperature for heat shrinkage, and the tube-like material is heated to conform to the shape of the outer circumferential surface of the core body and heated after being inserted into the article. The method is characterized in that the core is heat-shrinked so as to leave a heat-shrinkable stress that can recover the shape, and the bellows structure of the core is transferred onto the material tube, and after cooling, the core is removed.

本発明において用いられる熱収縮性の材料チューブは、
ポリ塩化ビニル、ポリエチレン、フッ素樹脂等の熱可塑
性プラスチック、シリコーンゴム、エチレン−プロピレ
ン共重合体ゴム等の合成ゴム、天然ゴム或いはこれらの
混合物のような熱拡大(延伸)加工可能な材料に所望に
より架橋剤、老化防止剤、着色剤等の添加剤を加え所定
の方法により成形してチューブ状物を得、これに加熱に
よって径を縮小し得る性質(熱収縮性)を付与するため
の熱拡大(延伸)加工を施して得られる。
The heat-shrinkable material tube used in the present invention is
Thermoplastic plastics such as polyvinyl chloride, polyethylene, and fluororesins, synthetic rubbers such as silicone rubber, ethylene-propylene copolymer rubber, natural rubber, and mixtures thereof may be heat-expandable (stretched) as desired. Additives such as cross-linking agents, anti-aging agents, colorants, etc. are added and molded using a specified method to obtain a tube-shaped product, which is then thermally expanded to give it the property of being able to reduce its diameter by heating (heat shrinkability). Obtained by (stretching) processing.

前記チューブ状物に対する熱拡大(延伸)加工は、例え
ばチューブ状物をその外径よりも犬なる内径を有する成
形管内に挿入し、次いでチューブ状物を軟化温度乃至溶
融温度に加熱すると共に加圧し成形管内周面に接触する
ように径を拡大させる方法により行なわれる。
Thermal expansion (stretching) processing of the tubular article is performed, for example, by inserting the tubular article into a forming tube having an inner diameter larger than its outer diameter, and then heating the tubular article to a softening temperature or melting temperature and applying pressure. This is done by enlarging the diameter so that it comes into contact with the inner circumferential surface of the forming tube.

なお、本発明においては材料チューブとしてホットメル
ト接着剤層、感圧性接着剤層等の接着剤層を内周面全面
に設けるか、或いは内周面に点在状に設けたものを用い
ることもできる。
In addition, in the present invention, the material tube may be provided with an adhesive layer such as a hot melt adhesive layer or a pressure-sensitive adhesive layer on the entire inner circumferential surface, or may be provided in a dotted manner on the inner circumferential surface. can.

一方、芯体は材料チューブにベローズ構造を転写形成せ
しめるためのもので、材料チューブの熱収縮適温におい
て軟化、変形しないものであれば材質として特に限定は
ないが、通常は金属製、耐熱プラスチック製、陶磁型膜
のものが用いられる本発明における芯体は、外周面にベ
ローズ構造を有するもので、その具体例としては、(1
)管状、棒状の芯体本体の外周面上にリング状またはラ
セン状の凸状段部を形成したもの、(2)管状、棒状の
芯体本体の外周面上にリングを所定間隔毎に配置したも
の、(3)管状、棒状の芯体本体の外周面上にラセン状
体を配置したもの、等が挙げられる。
On the other hand, the core is used to transfer the bellows structure onto the material tube, and is not particularly limited in material as long as it does not soften or deform at the appropriate temperature for heat shrinkage of the material tube, but it is usually made of metal or heat-resistant plastic. The core in the present invention, in which a ceramic type film is used, has a bellows structure on the outer peripheral surface, and specific examples thereof include (1).
) Ring-shaped or spiral-shaped convex steps are formed on the outer peripheral surface of a tubular or rod-shaped core body; (2) Rings are arranged at predetermined intervals on the outer peripheral surface of a tubular or rod-shaped core body. and (3) those in which a helical body is arranged on the outer peripheral surface of a tubular or rod-shaped core body.

前記(1)のタイプの芯体は、ベローズ構造の山部の高
さが比較的低い熱収縮性チューブを得る場合或いは材料
チューブがゴムのような弾性材料より成る場合に好適で
ある。
The core of type (1) is suitable for obtaining a heat-shrinkable tube with a relatively low peak height of the bellows structure, or when the material tube is made of an elastic material such as rubber.

なお、芯体を割型にしておけば材料チューブにベローズ
構造を転写形成せしめた後の取り除き作業が容易にでき
るので好ましい。
Incidentally, it is preferable if the core body is made into a split mold, since this makes it easier to remove the bellows structure after the bellows structure is transferred onto the material tube.

また、(2)のタイプの芯体を用いる場合も、(1)の
タイプの芯体の場合と同じ理由で芯体本体および/また
はリングを割型にしておくのが好ましい。
Also, when using the type (2) type of core, it is preferable to make the core body and/or the ring split for the same reason as in the case of the type (1) type of core.

特に、リングを割型にしておけば該リングを芯体本体の
所定位置に配置する作業も容易にできる。
In particular, if the ring is made into a split mold, the work of arranging the ring at a predetermined position on the core body can be facilitated.

更に(3)のタイプの芯体を用いる場合には、金属製の
ラセン状体のような末端に張力をかけるとラセン構造が
消滅もしくは一時的に解除されるものを用いれば、材料
チューブにベローズ構造を転写形成せしめた後の取り除
き作業が容易にできる。
Furthermore, when using a core of type (3), if you use a metal helical body whose helical structure disappears or is temporarily released when tension is applied to the end, a bellows can be formed on the material tube. After the structure has been transferred and formed, it can be easily removed.

勿論、芯体本体を割型にすることもできる。Of course, the core body can also be split.

なお、上記芯体の外周面をシリコーン樹脂等で剥離処理
しておけば、作業中に材料チューブが接着するようなこ
とが無いので好ましい。
It is preferable that the outer circumferential surface of the core is subjected to a peeling treatment using a silicone resin or the like, since this prevents the material tube from adhering during the work.

本発明によって得られる熱収縮性チューブはその一部ま
たは全体にベローズ構造を有するもので非ベローズ部は
もとよりベローズ構造部も熱収縮応力を保持するように
加工され、物品に挿入後に加熱することにより元のチュ
ーブ状物の形状に回復しようとするもので、その際に充
分な熱収縮を達成させるものである。
The heat-shrinkable tube obtained by the present invention has a bellows structure in part or in its entirety, and the non-bellows part as well as the bellows structure part are processed to retain heat shrinkage stress, and can be heated after being inserted into an article. The purpose is to restore the original shape of the tubular product, and to achieve sufficient thermal shrinkage at that time.

従って、芯体は最小外径が材料チューブを得るのに用い
たチューブ状物の内径よりも大きなものでなければなら
ない。
Therefore, the core must have a minimum outer diameter larger than the inner diameter of the tubular material used to obtain the material tube.

芯体の最小外径がチューブ状物の内径よりも小さな場合
には、材料チューブの熱収縮応力を残存せしめることが
できず目的とするベローズ構造を有する熱収縮性チュー
ブを得ることができない。
If the minimum outer diameter of the core is smaller than the inner diameter of the tube, the heat shrinkage stress of the material tube cannot be made to remain, making it impossible to obtain a heat shrinkable tube having the desired bellows structure.

本発明においては、チューブ状物を熱拡大加工すること
により熱収縮性を付与せしめた材料チューブが芯体に挿
入される。
In the present invention, a material tube that is made heat-shrinkable by thermally expanding a tube-like object is inserted into the core body.

この際、材料チューブの端部を紐状物で縛るか、クリッ
プ等の締具で芯体に固定しておけば、次に行なわれるベ
ローズ加工時に材料チューブが移動することがなく、作
業し易いので好ましい。
At this time, if you tie the end of the material tube with a string or fix it to the core with a fastener such as a clip, the material tube will not move during the next bellows processing, making the work easier. Therefore, it is preferable.

上記のようにして芯体に挿入された材料チューブは、次
いで熱収縮適温に加熱される。
The material tube inserted into the core as described above is then heated to an appropriate temperature for heat shrinkage.

この加熱時に、材料チューブは芯体外周面のベローズ構
造の形状に沿って熱収縮し、芯体のベローズ構造が転写
形成される。
During this heating, the material tube thermally shrinks along the shape of the bellows structure on the outer peripheral surface of the core, and the bellows structure of the core is transferred and formed.

材料チューブに芯体のベローズ構造を転写形成せしめた
後、水中浸漬、冷気吹き付け、放冷等によって冷却し、
芯体を取り除けばベローズ構造を有する熱収縮性チュー
ブが得られる。
After transferring the bellows structure of the core onto the material tube, it is cooled by immersion in water, blowing cold air, cooling, etc.
By removing the core, a heat-shrinkable tube with a bellows structure is obtained.

本発明は上記のように構成されており、煩雑な操作を必
要とせず容易に目的とするベローズ構造を有する熱収縮
性チューブを製造でき、芯体のベローズ構造を適宜変化
させることにより、各種ベローズ構造のものを自在に得
ることができる。
The present invention is configured as described above, and can easily produce a heat-shrinkable tube having a desired bellows structure without requiring complicated operations. By appropriately changing the bellows structure of the core body, various bellows You can freely obtain any structure.

しかも得られる熱収縮性チューブはベローズ構造を有す
るので屈曲状物品、湾曲状物品への挿入が容易であるば
かりでなく、挿入後に加熱するとベローズ構造が消失し
ながら収縮し、物品上に密着するので被覆処理作業も簡
単にできる等の効果を有する。
Moreover, since the resulting heat-shrinkable tube has a bellows structure, it is not only easy to insert into bent or curved articles, but when heated after insertion, the tube shrinks while the bellows structure disappears, and it adheres tightly to the article. It has the effect of simplifying the coating process.

以下、図面を参照しながら実施例により本発明を更に詳
細に説明する。
Hereinafter, the present invention will be explained in more detail by way of examples with reference to the drawings.

実施例 内径151m、外径19朋mのポリエチレンの長尺チュ
ーブ状物を電子線照射(照射線量25Mrad)により
架橋し、更に熱拡大(延伸)加工を施して内径45mm
、外径46.5mmの長尺の材料チューブ1を得る。
Example A long polyethylene tube with an inner diameter of 151 m and an outer diameter of 19 mm was crosslinked by electron beam irradiation (irradiation dose: 25 Mrad), and then thermally expanded (stretched) to create an inner diameter of 45 mm.
, a long material tube 1 having an outer diameter of 46.5 mm is obtained.

一方、これとは別に外径25朋m、長さ250mmの管
状の芯体本体2に内径25.1mm外径40mm、幅3
mnのリング3(4つ側構造)を配置し、更にこれと同
寸法の4つ側構造のリング4,5を10朋m間隔で配置
し外周面にベローズ構造を有する芯体を用意する。
On the other hand, apart from this, a tubular core body 2 with an outer diameter of 25 mm and a length of 250 mm has an inner diameter of 25.1 mm, an outer diameter of 40 mm, and a width of 3 mm.
A core body having a bellows structure on the outer circumferential surface is prepared by arranging a ring 3 (four-sided structure) of mn and further arranging rings 4 and 5 of the four-side structure having the same dimensions at an interval of 10 m.

この芯体の最小外径aは前記ポリエチレンの長尺チュー
ブ状物の内径よりも大きなものである。
The minimum outer diameter a of this core is larger than the inner diameter of the long polyethylene tube.

次に、第1図に示すように芯体本体2およびリング3,
4.5から成る芯体上に長さ200℃朋に切断した材料
チューブ1を挿入する。
Next, as shown in FIG. 1, the core body 2 and the ring 3,
A material tube 1 cut to a length of 200° C. is inserted onto the core consisting of 4.5.

その後、材料チューブ1を150℃の温度に20分間加
熱する。
Thereafter, the material tube 1 is heated to a temperature of 150° C. for 20 minutes.

該加熱により材料チューブ1は、第2図に示すように芯
体外周面のベローズ構搭の形状に沿って熱収縮し、芯体
外周面のベローズ構造が転写形成される。
By this heating, the material tube 1 is thermally contracted along the shape of the bellows structure on the outer peripheral surface of the core as shown in FIG. 2, and the bellows structure on the outer peripheral surface of the core is formed by transfer.

次いで、20℃の流水中に10分間浸漬して冷却し、水
中より引き上げ、リング3,4,5および芯体本体2を
取り除きベローズ構造を有する熱収縮性チューブ6を得
た。
Next, it was immersed in running water at 20° C. for 10 minutes to cool it, and then pulled out of the water, and the rings 3, 4, 5 and core body 2 were removed to obtain a heat-shrinkable tube 6 having a bellows structure.

このベローズ構造を有する熱収縮性チューブ6は、山部
を3個所有し各山部の間隔は1.0mmで、長さ190
mmのものであった。
The heat-shrinkable tube 6 with this bellows structure has three peaks, the interval between each peak is 1.0 mm, and the length is 190 mm.
It was mm.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図および第2図は本発明に係るベローズ構造を有す
る熱収縮性チューブの製法法の実例を示すもので、第1
図は芯体上に材料チューブを挿入した状態を示す縦断面
図、第2図は材料チューブを熱収縮適温に加熱し、芯体
外周面のベローズ構造の形状に沿うように熱収縮せしめ
た直後の状態を示す縦断面図である。 1・・・・・・材料チューブ、2・・・・・・芯体本体
、6・・・・・・ベローズ構造を有する熱収縮性チュー
ブ。
Figures 1 and 2 show an example of the method for manufacturing a heat-shrinkable tube having a bellows structure according to the present invention.
The figure is a vertical cross-sectional view showing the state in which the material tube is inserted onto the core body, and Figure 2 shows the material tube immediately after it has been heated to an appropriate temperature for heat shrinkage and has been heat-shrinked to follow the shape of the bellows structure on the outer circumferential surface of the core body. FIG. DESCRIPTION OF SYMBOLS 1...Material tube, 2...Core body, 6...Heat-shrinkable tube having a bellows structure.

Claims (1)

【特許請求の範囲】[Claims] 1 熱可塑性プラスチック、ゴム或いはこれらの混合物
から成るチューブ状物を熱拡大加工せしめて熱収縮性を
有する材料チューブを得、この材料チューブを最小外径
が前記チューブ状物の内径よりも大きく且つ外周面にベ
ローズ構造を有する芯体上に挿入し、次いで材料チュー
ブを熱収縮適温に加熱し、芯体外周面の形状に沿わし且
つ物品に挿入後の加熱により前記チューブ状物の形状に
回復し得る熱収縮応力を残存せしめるように熱収縮させ
て、材料チューブに芯体のベローズ構造を転写形成させ
て冷却した後、前記芯体を取り除くことを特徴とするベ
ローズ構造を有する熱収縮性チューブの製造法。
1 A tube-like material made of thermoplastic plastic, rubber, or a mixture thereof is heat-expanded to obtain a heat-shrinkable material tube, and this material tube is made into a material having a minimum outer diameter larger than the inner diameter of the tube-like material and an outer circumference. The material tube is inserted onto a core body having a bellows structure on its surface, and then the material tube is heated to an appropriate temperature for heat shrinkage, so that it conforms to the shape of the outer peripheral surface of the core body and recovers the shape of the tube-like object by heating after being inserted into the article. A heat-shrinkable tube having a bellows structure, which is characterized in that the material tube is heat-shrinked so that the resulting heat-shrinkage stress remains, and the bellows structure of the core is transferred onto the material tube, and after cooling, the core is removed. Manufacturing method.
JP52067698A 1977-06-07 1977-06-07 Method for manufacturing heat-shrinkable tube with bellows structure Expired JPS5815298B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52067698A JPS5815298B2 (en) 1977-06-07 1977-06-07 Method for manufacturing heat-shrinkable tube with bellows structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52067698A JPS5815298B2 (en) 1977-06-07 1977-06-07 Method for manufacturing heat-shrinkable tube with bellows structure

Publications (2)

Publication Number Publication Date
JPS543171A JPS543171A (en) 1979-01-11
JPS5815298B2 true JPS5815298B2 (en) 1983-03-24

Family

ID=13352424

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52067698A Expired JPS5815298B2 (en) 1977-06-07 1977-06-07 Method for manufacturing heat-shrinkable tube with bellows structure

Country Status (1)

Country Link
JP (1) JPS5815298B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8333249D0 (en) * 1983-12-13 1984-01-18 Raychem Ltd Electrically insulating articles
KR100683285B1 (en) 2005-10-24 2007-02-15 하재민 Dividable metal bellows
CN107131578A (en) * 2017-04-13 2017-09-05 广东美的暖通设备有限公司 Shock absorbing pipe and air conditioner

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52107074A (en) * 1976-03-05 1977-09-08 Showa Electric Wire & Cable Co Process for making rippled flexible tubes

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52107074A (en) * 1976-03-05 1977-09-08 Showa Electric Wire & Cable Co Process for making rippled flexible tubes

Also Published As

Publication number Publication date
JPS543171A (en) 1979-01-11

Similar Documents

Publication Publication Date Title
US3483285A (en) Clamping device and method
US4650703A (en) Recoverable article and method
US4297155A (en) Heat-shrinkable hollow article
US2780274A (en) Method of making flexible corrugated hose
JPS5815298B2 (en) Method for manufacturing heat-shrinkable tube with bellows structure
JP4278815B2 (en) Water-blocking cold shrinkable tube
US4386984A (en) Heat-shrinkable hollow article
JPS5854009B2 (en) Manufacturing method for resin pipes that shrink in stages
JPS5922972Y2 (en) Heat shrinking jig for heat shrinkable tubes with different diameters
JP3560971B2 (en) Heat-recoverable articles
JPS604052B2 (en) How to coat articles
JPH0613581Y2 (en) Silicone rubber composite heat-shrinkable tube
US4402777A (en) Sleeve and covering for tubing
JPS635855Y2 (en)
JPS6262730A (en) Manufacture of thermally recoverable tube
GB2106828A (en) Moulding wraparound closure sleeve
JPS5854647B2 (en) Method for manufacturing heat-shrinkable tube
JP3529171B2 (en) Method of manufacturing star-shaped shrink tube
JPS5854648B2 (en) Manufacturing method of heat-shrinkable tube
JPS5852098Y2 (en) heat recoverable articles
JPS5828104B2 (en) Manufacturing method of bellows tube
JPS5923687B2 (en) Manufacturing method of heat-shrinkable tube
JPS5933613Y2 (en) heat astringent tube
JPS623219Y2 (en)
JPH06234157A (en) Manufacture of molded material of thermal recovery properties