JPS6015123A - Manufacture of heat-shrinkable sheet - Google Patents
Manufacture of heat-shrinkable sheetInfo
- Publication number
- JPS6015123A JPS6015123A JP12368383A JP12368383A JPS6015123A JP S6015123 A JPS6015123 A JP S6015123A JP 12368383 A JP12368383 A JP 12368383A JP 12368383 A JP12368383 A JP 12368383A JP S6015123 A JPS6015123 A JP S6015123A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- sheet
- sheet material
- layer
- shrinkable
- 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.)
- Granted
Links
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Processing Of Terminals (AREA)
- Cable Accessories (AREA)
Abstract
Description
本発明は、電気１通信ケーブル等の接続部を密封するた
めに使用される熱収縮性シートの製造方法に関するもの
である。
一般に、電気９通信ケーブル等の接続部を密封して外気
から保護するために、第１図に示すような熱収縮性シー
トが使用されている。
この熱収縮性シートｌは１幅方向The present invention relates to a method for manufacturing a heat-shrinkable sheet used for sealing connections of electrical communication cables and the like. Generally, a heat-shrinkable sheet as shown in FIG. 1 is used to seal the connection parts of electrical communication cables and the like to protect them from the outside air. This heat-shrinkable sheet l has one width direction.
【図中矢印（ａｔ−（
ａｌの方向〕に熱収縮可能な熱収縮層２と、この熱収縮
ＩＩ ２の内面に設けられた熱融着層３と、前記熱収縮
層２の外面の両側部に設けられた突条４．４とから構成
されており、第２図に示すように、ケーブル５．５の接
続部６に巻き付けて前記突条４．４の裏側位置の熱融着
層３相互を突き合わせ、かつ、前記突条４，４に押圧用
ロッド７．７等を縦添えしてクリップ８．８・・・等で
挾んだ状態とし、しかる後に加熱収縮させかつ熱融層さ
せるようになっている。
このような熱収縮性シート１を製造するための従来例と
しては１例えば、ポリエチレンに架橋剤を配合してなる
第１の層（熱収縮層２となるべき層］と、未架橋ポリエ
チレンからなるＭ２の層（熱融着層３となるぺぎ層〕と
を二層押出成形丁ることにより、押出時に両者を一体化
するとともにダイスの押出口の形状に従わせて前記第１
の層の外面の両側部に前記突条４，４をＭする形状のシ
ートを形成し、次いで、このシートラ一定時間熱処理し
℃前記第１σ）ｌｉｆｌｔ架楡させ、しかる後にシート
を幅方向（突条４，４を離反させる方向）に−軸延伸し
て前記第１の層に熱収縮性を付与する方法がある。
しかしながら、このような方法にあっては、押出成形後
に再び熱処理を施工１こめ、次のような問題を生ずるお
それがある。
即ち、熱収縮性シートはその密封性を高ぬるために、幅
方向に可能な限り均一な収縮性能が要求されるものであ
るが、前記熱処理の際に前記第２の層が軟化し変形して
肉厚むらが生じ易（、これが延伸の際に第１の層に延住
むらな発生させて熱収縮性能の均一さが損われるという
問題である。
また、前述の熱処理によらずに、高エネルギー放射線を
利用して前記第１の層の架Ｗｉ？行なう方法もあるが、
放射線処理は設備費が高（つくためコスト高となる難点
がある。
本発明は、前述事情を背景になされＫもので熱収縮性能
Ｑ均一さを高めることができ、かつ、製造コストが安価
な熱収縮性シートの製造方法の提供を目的とし、圧縮成
形によって熱収縮層シート材の成形および架橋を行なう
工程と、同じ（圧縮成形によって熱融着層シート材の成
形および熱収縮層シート材と熱融着層シート材との一体
化を行なう工程とを行なっ瓦後、これら一体化しに両シ
ート材を幅方向に一軸延伸する工程を行なうことを特徴
とするものである。
以下、本発明を第３図四〜（ｌに示す一実施例に基づい
℃説明する。
まず本実施例に適用される圧縮成形用金型について説明
すると、金型９は、キャビティ９ａの底面の両側部に沼
って突条成形用の一対の溝９ｂ。
９ｂを７にする下型９Ｃと、熱収縮層シート材成彫用の
第１の上型９ｄと、熱融ｆｌｉ［ｉｆシート材成形用の
第２の上型９ｅとからなり、前記下型９Ｃのキャビティ
９ａＣ／）底面および第２の上型９ｅの下面には、熱収
縮層シート材および熱融讐Ｊ−シート材の両測部以外の
部分を厚肉に成形するたぬの凹部９ｆ、９ｇが各々設け
られている。これは後述する熱融Ｎ１−シート材および
熱融着層シート材の延伸の際に、これら両シート材の両
測部以外の部分が両側部に比べて引き伸ばされ易く、そ
れだけ厚さが減少するという傾向に対処する窺めのもの
である。
さて１本発明の製造方法を工程順に説明丁れば、前記下
型９Ｃのキャビティ９ａに、第３図（Ａ）に示すように
熱収縮１−シート材１０を入れる。こり熱収縮層シート
材１０は、例えば、架橋剤、安定剤およびカーボンブラ
ック等を配合した未架橋ポリエチレンをシート状に予備
成形しｋものである。そして第３図（Ｈ）に示すように
、下型９Ｃと前記第１の上型９ｄを閉じて、これらの間
で、熱収縮層シート材ｌＯを一定時間加熱加圧する。
このとき熱収縮層シート材１０が一旦流動状態となり、
その一部が＠配溝９ｂ、（ｌｂに流れ込んで突条４．４
が形成され、さらに加熱温度を高（すると、架橋剤が分
解して熱収縮層シート材１０が架橋する。
架橋が完了したら、第３図（Ｃ）のように、熱収縮層シ
ート材１０をキャビティ９ａに残した状態で下型９Ｃと
第１の上型９ｄを開き、この第１の上型９ｄを第２の上
型９ｅと交換しに後、第３図（Ｉ〕）のように、熱収縮
層シート材１０の土に熱融着層シート材１１を載置する
。この熱融Ｎ１−シート材１１は、例えば未架橋ポリエ
チレンをシート状に予備成形しｋものである。
次いで、第３図（Ｅ）のように、下型９Ｃと第２の上型
９ｅを閉じて、前記架構し良熱収縮層シート材１０と第
２の上型９ｅとの間で熱融着層シート材】１を加熱加圧
し、熱融Ｎ層シート材１１を成形するとともに、熱融Ｎ
Ｎｉシート材１１を熱収縮層シート材１０に熱融着させ
る。そしてこれら両シート材１０．ＩＩ′ｆｒ：冷却固
化させた後、第３図ＣＦ）のように、下型９Ｃと第２の
上型９ｅを開いて両シート材１０．１１をキャビティ９
ａから取り山王。
こりようにして熱収縮層シート材１０がその外面の両側
部に突条４，１’有し、架橋され、がっ、熱収縮層シー
ト材１０と熱融層層シート材１１とが一体化されたシー
トχ得た後、第３図（Ｇ）に示すように、延伸！（図示
略）等の把持具１２゜１２等によって前記シートの両側
部を杷持し、幅方向〔第３図（Ｇ）の矢印方向〕に一軸
延伸して第３図（Ｈ）に示すように、熱収量層２．熱融
看１−３および突条４．４を有する熱収縮性シート１が
完成する。
以上説明し１こように、不発明によれば熱収縮層シート
材を金型内で成形しかつ架橋する工程と、熱融層層シー
ト材と熱収縮層シート材とを金型内で一体成形する工程
とを行なった後、これら一体化した両シート材を幅方向
に一軸延伸して熱収縮性シートを得るので、延伸前の両
シート材の形状安定性が良好であり、即ち、両シート材
に変形や肉厚むらが発生し難く、熱収縮層シート材を可
及的に均一に延伸することができる。従って幅方向に均
一な熱収縮性を有する熱収縮性シートを得ることがでさ
、また単品ずつ生産することができるので小ロットで生
産したい場合の製造方法として好適である、等の優れπ
効果な奏する。[Arrow in the figure (at-(
a heat-shrinkable layer 2 that can be heat-shrinkable in the [al direction]; a heat-sealing layer 3 provided on the inner surface of the heat-shrinkable layer 2; and protrusions 4 provided on both sides of the outer surface of the heat-shrinkable layer 2. As shown in FIG. Pressing rods 7, 7, etc. are attached vertically to the protrusions 4, 4, and held between clips 8, 8, etc., and then heated and shrunk to form a heat melt layer. A conventional example for producing such a heat-shrinkable sheet 1 is 1, for example, a first layer made of polyethylene mixed with a crosslinking agent (layer to be the heat-shrinkable layer 2), and a layer made of uncrosslinked polyethylene. By extruding the M2 layer (the layer that will become the heat-sealing layer 3) in two layers, both are integrated during extrusion, and the first
A sheet having the shape of the protrusions 4, 4 is formed on both sides of the outer surface of the layer, and then this sheet is heat-treated for a certain period of time to be stretched over the first σ), and then the sheet is stretched in the width direction (the protrusions are There is a method of imparting heat-shrinkability to the first layer by -axial stretching in the direction (direction in which the strips 4, 4 are separated). However, in such a method, heat treatment is performed again after extrusion molding, which may cause the following problems. That is, a heat-shrinkable sheet is required to have shrinkage performance as uniform as possible in the width direction in order to improve its sealing performance, but the second layer may soften and deform during the heat treatment. (This is a problem that causes unevenness in the first layer during stretching, which impairs the uniformity of heat shrinkage performance.Also, without the above-mentioned heat treatment, There is also a method of performing the wiring of the first layer using high-energy radiation,
Radiation treatment has the disadvantage of being expensive due to high equipment costs.The present invention was developed against the background of the above-mentioned circumstances, and is capable of improving the uniformity of heat shrinkage performance and is inexpensive to manufacture. The purpose of this is to provide a method for manufacturing a heat-shrinkable sheet, which is the same as the process of forming and cross-linking a heat-shrinkable layer sheet material by compression molding (forming a heat-adhesive layer sheet material by compression molding and cross-linking a heat-shrinkable layer sheet material). The present invention is characterized by performing a step of integrating the heat-adhesive layer with the sheet material, and after forming the tile, a step of uniaxially stretching both sheet materials in the width direction to integrate them. A description will be given based on an embodiment shown in FIGS. A pair of grooves 9b for forming protrusions. A lower die 9C with 9b set to 7, a first upper die 9d for forming heat-shrinkable layer sheet material, and a second groove for forming heat-melting layer sheet material. The bottom surface of the cavity 9aC/) of the lower mold 9C and the lower surface of the second upper mold 9e are provided with a heat shrink layer sheet material and a heat melting J-sheet material other than both measurement parts. Recesses 9f and 9g are provided to thicken the heat-melting layer sheet material. This is an attempt to deal with the tendency that parts other than the lower part are stretched more easily than the both sides, and the thickness decreases accordingly. A heat-shrinkable layer sheet material 10 is placed in the cavity 9a of 9C as shown in FIG. The cross-linked polyethylene is preformed into a sheet shape.Then, as shown in FIG. 3(H), the lower mold 9C and the first upper mold 9d are closed, and the heat-shrinkable layer sheet is The material 10 is heated and pressurized for a certain period of time. At this time, the heat-shrinkable layer sheet material 10 is once in a fluid state,
A part of it flows into @ distribution groove 9b, (lb) and protrusion 4.4
is formed, and the heating temperature is further increased (as a result, the crosslinking agent decomposes and the heat-shrinkable layer sheet material 10 is crosslinked. When the crosslinking is completed, the heat-shrinkable layer sheet material 10 is heated as shown in FIG. 3(C). Open the lower mold 9C and the first upper mold 9d while leaving them in the cavity 9a, and after replacing the first upper mold 9d with the second upper mold 9e, as shown in FIG. 3 (I). , the heat-fusible layer sheet material 11 is placed on the soil of the heat-shrinkable layer sheet material 10. This heat-fusible N1-sheet material 11 is, for example, a material obtained by preforming uncrosslinked polyethylene into a sheet shape. As shown in FIG. 3(E), the lower mold 9C and the second upper mold 9e are closed, and the heat-adhesive layer sheet is inserted between the structural heat-shrinkable layer sheet material 10 and the second upper mold 9e. Material] 1 is heated and pressurized to form a heat-fused N-layer sheet material 11, and the heat-fused N-layer sheet material 11 is
The Ni sheet material 11 is heat-sealed to the heat-shrinkable layer sheet material 10. And these two sheet materials 10. II'fr: After cooling and solidifying, the lower mold 9C and the second upper mold 9e are opened and both sheet materials 10 and 11 are placed in the cavity 9 as shown in Fig. 3 CF).
Take Sanno from a. In this way, the heat-shrink layer sheet material 10 has protrusions 4, 1' on both sides of its outer surface, and is cross-linked, so that the heat-shrink layer sheet material 10 and the heat-fusible layer sheet material 11 are integrated. After obtaining the sheet χ, as shown in FIG. 3(G), it is stretched! (not shown), etc., hold both sides of the sheet, and stretch it uniaxially in the width direction [in the direction of the arrow in FIG. 3(G)] as shown in FIG. 3(H). 2. A heat-shrinkable sheet 1 having a heat-melting member 1-3 and protrusions 4.4 is completed. As explained above, 1 As described above, according to the invention, there is a step of molding and crosslinking the heat-shrinkable layer sheet material in a mold, and a step of integrating the heat-fusible layer sheet material and the heat-shrinkable layer sheet material in the mold. After performing the forming step, both of these integrated sheet materials are uniaxially stretched in the width direction to obtain a heat-shrinkable sheet, so the shape stability of both sheet materials before stretching is good. Deformation and thickness unevenness are less likely to occur in the sheet material, and the heat-shrinkable layer sheet material can be stretched as uniformly as possible. Therefore, it is possible to obtain a heat-shrinkable sheet with uniform heat-shrinkability in the width direction, and since it can be produced individually, it is suitable as a manufacturing method when you want to produce in small lots.
Effective performance.
第１図は熱収縮性シートの斜視図、第２図は熱収縮性シ
ートの使用状態を説明する斜視図、第３図（Ａ）〜（Ｈ
）は本発明に係る製造工程の一実施例を示す説明図であ
る。
１・・・熱収縮性シート、２・・・熱収縮層、３・・・
熱融層層、４・・・突条、５°・・ケーブル、６・・・
接続部、９・・・金型、９ｃパ°下型％９ｄ・・・第１
の上型、９ｅ・・・第２の上型、９ｆ、９ｇ・・・凹部
、１０・・・熱収縮Ｊｆｌシート材、１】・・・熱融Ｎ
Ｗｌシート材。
出願人 藤倉電線株式会社
第３
（Ａン ９
（Ｂ）
（Ｃ）
図
（Ｄ）
（Ｆ）Figure 1 is a perspective view of the heat-shrinkable sheet, Figure 2 is a perspective view illustrating how the heat-shrinkable sheet is used, and Figures 3 (A) to (H
) is an explanatory diagram showing an example of the manufacturing process according to the present invention. 1... Heat-shrinkable sheet, 2... Heat-shrinkable layer, 3...
Thermal melt layer, 4... Protrusion, 5°... Cable, 6...
Connection part, 9... Mold, 9c Pa° lower mold% 9d... 1st
upper mold, 9e...second upper mold, 9f, 9g...recess, 10...heat-shrinkable Jfl sheet material, 1]...heat-fused N
Wl sheet material. Applicant Fujikura Electric Wire Co., Ltd. No. 3 (A 9 (B) (C) Figures (D) (F)
Claims (1)
熱７１１１１ＥＥすることにより、熱収縮層シート材を
架橋するとともに、その一方の面の両側部に突条（４，
４）’Ｊｒ形成する工程と、 （ロ）、熱融着層シート材（１１）ｙ！−熱収縮層シー
ト材（１０）の他方の面に宣ね合わせて金型（９）内で
加熱加圧することにより、前記両シート材（１０，１１
３を一体化する工程と、 ｅｊ、これらＨ）、（口１の後、前記一体化しに両シー
ト材（１０，１１）を幅方向に一軸延伸する工程とを有
することを特徴とする熱収縮性シートの製造方法。[Claims] (A) By heating the heat-shrinkable layer sheet material (10) in the mold (9), the heat-shrinkable layer sheet material is crosslinked, and both sides of one side of the heat-shrinkable layer sheet material are crosslinked. Projection (4,
4) 'Jr forming step, (b) Heat-adhesive layer sheet material (11)y! - By applying heat and pressure to the other side of the heat-shrinkable layer sheet material (10) in the mold (9),
3, and a step of uniaxially stretching both sheet materials (10, 11) in the width direction after the opening 1 to integrate the sheet materials (10, 11). Method of manufacturing a sex sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12368383A JPS6015123A (en) | 1983-07-07 | 1983-07-07 | Manufacture of heat-shrinkable sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12368383A JPS6015123A (en) | 1983-07-07 | 1983-07-07 | Manufacture of heat-shrinkable sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6015123A true JPS6015123A (en) | 1985-01-25 |
| JPH0337496B2 JPH0337496B2 (en) | 1991-06-05 |
Family
ID=14866727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12368383A Granted JPS6015123A (en) | 1983-07-07 | 1983-07-07 | Manufacture of heat-shrinkable sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6015123A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081182A (en) * | 1996-11-22 | 2000-06-27 | Matsushita Electric Industrial Co., Ltd. | Temperature sensor element and temperature sensor including the same |
-
1983
- 1983-07-07 JP JP12368383A patent/JPS6015123A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081182A (en) * | 1996-11-22 | 2000-06-27 | Matsushita Electric Industrial Co., Ltd. | Temperature sensor element and temperature sensor including the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0337496B2 (en) | 1991-06-05 |
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