JPH032051B2 - - Google Patents
Info
- Publication number
- JPH032051B2 JPH032051B2 JP7521883A JP7521883A JPH032051B2 JP H032051 B2 JPH032051 B2 JP H032051B2 JP 7521883 A JP7521883 A JP 7521883A JP 7521883 A JP7521883 A JP 7521883A JP H032051 B2 JPH032051 B2 JP H032051B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- heat
- sides
- plastic sheet
- stretched
- 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
- 239000002985 plastic film Substances 0.000 claims description 25
- 239000012793 heat-sealing layer Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000010410 layer Substances 0.000 description 2
- 239000004831 Hot glue Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/06—Making preforms having internal stresses, e.g. plastic memory
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Processing Of Terminals (AREA)
Description
【発明の詳細な説明】
本発明は、電気ケーブル相互の接続部を密封す
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。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a heat-shrinkable sheet used for sealing connections between electrical cables.
従来、ケーブルの接続部を保護するために第１
図に示すようなケーブル接続用熱収縮性シートが
使用されている。この熱収縮性シート１は、幅方
向〔図中イ−ロの方向〕に熱収縮性を有するプラ
スチツクシート２と、このプラスチツクシート２
の外面の両側縁に沿つて設けられた突条３，３
と、プラスチツクシート２の内面に設けられた熱
融着層４とから構成され、第２図に示すようにケ
ーブル５，５の接続部６に巻き付けて両側部の熱
融着層４，４を突き合わせ、この両側部を棒状部
材７，７等を介してクリツプ８，８…等で挾んで
固定し、加熱収縮させることによつて前記接続部
６を密封するものである。 Traditionally, the first method was used to protect cable connections.
A heat-shrinkable sheet for cable connection as shown in the figure is used. This heat-shrinkable sheet 1 consists of a plastic sheet 2 that has heat-shrinkability in the width direction (in the direction of yellow in the figure), and a plastic sheet 2 that
Projections 3, 3 provided along both side edges of the outer surface of
and a heat sealing layer 4 provided on the inner surface of the plastic sheet 2. As shown in FIG. The connecting portion 6 is sealed by abutting against each other, clamping and fixing both side portions with clips 8, 8, etc. via rod-like members 7, 7, etc., and heat-shrinking them.
ところでこのような熱収縮性シート１を得るた
めの手段として、例えば架橋ポリエチレン等から
なるプラスチツクシート２および突条３，３と、
未架橋ポリエチレン等からなる熱融着層４とを二
層押し出して第３図に示すような横断面形状のシ
ート１′を形成し、このシート１′の突状３，３近
傍を把持して矢印方向に延伸し、プラスチツクシ
ート２に熱収縮性を付与する方法が考えられる。 By the way, as a means for obtaining such a heat-shrinkable sheet 1, a plastic sheet 2 made of, for example, crosslinked polyethylene, protrusions 3, 3,
A sheet 1' having a cross-sectional shape as shown in FIG. 3 is formed by extruding two layers and a heat-sealing layer 4 made of uncrosslinked polyethylene, etc., and the protrusions 3, 3 of this sheet 1' are gripped. A possible method is to stretch the plastic sheet 2 in the direction of the arrow to impart heat shrinkability to the plastic sheet 2.
しかしながら前記延伸の際に把持した突条３，
３の近傍は、他の部分と比較して延伸され難く、
延伸後、第４図に示すように突条３，３近傍の両
側部が厚肉状態となる傾向がある。そしてこの傾
向は、例えば、第３図鎖線で示すように、突条
３，３にフツク９，９を引掛けて延伸した場合も
避けることができなかつた。従つてこのようにし
て形成された熱融着層シート１を前記接続部６に
巻き付けて両側部の内面を付き合わせると第５図
の如く、両側部の合わせ目Ｘの下方に間隙Ｙが生
じ、この間隙Ｙが加熱収縮後も残り易いために接
続部６の密封性が損われるおそれがあつた。 However, the protrusion 3 gripped during the stretching,
The vicinity of 3 is difficult to stretch compared to other parts,
After stretching, as shown in FIG. 4, both sides of the protrusions 3, 3 and their vicinity tend to become thick. This tendency could not be avoided even when the protrusions 3, 3 were hooked with hooks 9, 9 for stretching, as shown by chain lines in FIG. 3, for example. Therefore, when the heat-sealing layer sheet 1 thus formed is wrapped around the connecting portion 6 and the inner surfaces of both sides are brought together, a gap Y is created below the seam X of both sides, as shown in FIG. Since this gap Y tends to remain even after heat shrinkage, there is a risk that the sealing performance of the connection portion 6 may be impaired.
本発明は、前述事情を背景になされたもので、
密封性の優れたケーブル接続用熱収縮性シートの
製造方法の提供を目的とするものである。 The present invention was made against the background of the above-mentioned circumstances, and
The object of the present invention is to provide a method for manufacturing a heat-shrinkable sheet for cable connection with excellent sealing properties.
以下本発明を第６図〜第１３図に示す一実施例
に基づいて説明する。 The present invention will be described below based on an embodiment shown in FIGS. 6 to 13.
まず未架橋ポリエチレン等よりプラスチツクシ
ート１０および突条１１，１１を押し出し成型し
て、第６図に示すような横断面形状のモールドシ
ート１２Ａを形成する。次に突条１１，１１が突
出するモールドシート１２Ａの外面側から高エネ
ルギー放射線を照射してプラスチツクシート１０
および突条１１，１１を架橋させて第７図に示す
ようなシート１２Ｂを形成する。このときシート
１２Ｂの内面側は架橋されてないため、この結果
シート１２Ｂの内面側は未架橋ポリエチレンから
なる熱融着層１３となる。しかる後に、このシー
ト１２Ｂを幅方向（第７図矢印方向）に一軸延伸
し、シート１２Ｂの外面側（プラスチツクシート
１０）に幅方向への熱収縮性を付与し第８図に示
す延伸シート１２Ｃを形成する。この段階で、延
伸シート１２Ｃの突条１１，１１近傍の両側部は
前述したようにシート１２Ｃの中央部よりも厚肉
な状態となる傾向にある。次いでこの延伸シート
１２Ｃをプレス機等にかけて、延伸シート１２Ｃ
の両側部のみを加熱（例えば110℃前後）しなが
ら、突条１１，１１近傍の厚肉な部分を厚さ方向
（第８図矢印方向）に圧潰して、第９図のように
突条１１，１１を除く部分の肉圧をほぼ均一な厚
さとする。次に、この加熱状態を維持したまま延
伸シート１２Ｃの両側部を第９図鎖線の如く、外
面側〔矢印ホおよびヘの方向〕に折り曲げ、一定
時間経過後に冷却してくせ付けを施し、第１０図
に示すような熱収縮性シート１２Ｄを形成する。
ただし、前記両側部の加熱の際、延伸シート１２
Ｃの両側部以外の部分を水、空気などによつて冷
却して、両側部の熱が延伸シートの中央部へ伝導
しないようにしておく。 First, the plastic sheet 10 and the protrusions 11, 11 are extruded and molded from uncrosslinked polyethylene or the like to form a molded sheet 12A having a cross-sectional shape as shown in FIG. Next, high-energy radiation is irradiated from the outer surface of the molded sheet 12A from which the protrusions 11, 11 protrude to form the plastic sheet 10.
Then, the protrusions 11, 11 are crosslinked to form a sheet 12B as shown in FIG. At this time, since the inner surface side of the sheet 12B is not crosslinked, as a result, the inner surface side of the sheet 12B becomes a heat sealing layer 13 made of uncrosslinked polyethylene. Thereafter, this sheet 12B is uniaxially stretched in the width direction (in the direction of the arrow in FIG. 7), and the outer surface side (plastic sheet 10) of the sheet 12B is given heat shrinkability in the width direction to form a stretched sheet 12C shown in FIG. form. At this stage, both side portions of the stretched sheet 12C near the protrusions 11, 11 tend to be thicker than the central portion of the sheet 12C, as described above. Next, this stretched sheet 12C is applied to a press or the like to form a stretched sheet 12C.
While heating only both sides (for example, around 110°C), crush the thick parts near the ridges 11 in the thickness direction (in the direction of the arrow in Figure 8) to form the ridges as shown in Figure 9. The thickness of the portions excluding 11 and 11 is made almost uniform. Next, while maintaining this heated state, both sides of the stretched sheet 12C are bent toward the outer surface (in the direction of arrows E and F) as shown by the chain lines in FIG. A heat-shrinkable sheet 12D as shown in FIG. 10 is formed.
However, when heating the both sides, the stretched sheet 12
The parts other than both sides of C are cooled with water, air, etc. to prevent heat from both sides from being conducted to the center of the stretched sheet.
なお、前述の場合、プラスチツクシート１０の
内面側が熱融着層１３となるようにしたが、押出
成形の段階で、例えばホツトメルト型接着剤（エ
チレン−酢酸ビニルの共重合体を主成分とする接
着剤）をプラスチツクシート１０と共に二層押し
出しして、この接着剤からなる熱融着層１３を設
けてもよい。また、本実施例では延伸シート１２
Ｃの突条近傍を圧潰してから両側部を折り曲げる
工程順としたが、両側部を折り曲げてから突条近
傍を圧潰するようにしてもよい。 In the above case, the inner surface of the plastic sheet 10 was made to be the heat-sealing layer 13, but in the extrusion molding stage, for example, a hot-melt adhesive (adhesive mainly composed of an ethylene-vinyl acetate copolymer) was applied. The heat-sealing layer 13 made of this adhesive may be provided by extruding two layers of the adhesive together with the plastic sheet 10. In addition, in this embodiment, the stretched sheet 12
Although the process order of C is shown as crushing the vicinity of the protrusion and then folding both sides, it is also possible to bend the both sides and then crushing the vicinity of the protrusion.
このようにして形成された熱収縮性シート１２
Ｄを第１１図のように、その幅方向がケーブルの
接続部６の周方向と一致するように接続部６に巻
き付けると、熱収縮性シート１２Ｄの両側部は接
続部６の半径方向外方に立ち上がつた状態とな
り、かつ、相互に平行な状態となる。よつて両側
部の内面（熱融着層１３，１３）相互を突き合わ
せる作業が容易になる。また、第１２図のように
棒状部材７およびクリツプ８等により両側部を固
定した場合、両側部の肉厚が他の肉厚とほぼ等し
く、かつ両側部が折り曲げられることによつて出
来た角部Ｚ、Ｚ相互が密接し、この密接し合う角
部Ｚ、Ｚが接続部６の外面に接するので合わせ目
Ｘの下方に間隙ができ難い。しかる後に熱収縮性
シート１２Ｄを加熱してプラスチツクシート１０
を収縮させると熱融着層１３が接続部６の外周面
に沿つて気密に熱融着し、かつ、両側部の内面相
互が熱融着する。従つて、第１３図に示す如くケ
ーブルの接続部６が緊密に密封されるものであ
る。 Heat-shrinkable sheet 12 thus formed
When the heat-shrinkable sheet 12D is wrapped around the connecting portion 6 so that its width direction coincides with the circumferential direction of the connecting portion 6 of the cable as shown in FIG. They are in a state where they stand up and are parallel to each other. Therefore, the work of butting the inner surfaces (thermal adhesive layers 13, 13) of both sides against each other becomes easy. In addition, when both sides are fixed with rod-shaped members 7 and clips 8 as shown in Fig. 12, the wall thickness of both sides is almost equal to the other wall thickness, and an angle formed by bending both sides is formed. Since the portions Z and Z are in close contact with each other and the closely-contact corner portions Z and Z are in contact with the outer surface of the connecting portion 6, it is difficult to form a gap below the seam X. Thereafter, the heat-shrinkable sheet 12D is heated to form a plastic sheet 10.
When contracted, the heat-sealing layer 13 is airtightly heat-sealed along the outer peripheral surface of the connecting portion 6, and the inner surfaces of both sides are heat-sealed to each other. Therefore, the cable connection portion 6 is tightly sealed as shown in FIG. 13.
以上説明したように本発明によればプラスチツ
クシートと、このプラスチツクシートの外面の両
側縁に沿つて設けられた突条と、プラスチツクシ
ートの内面に設けられた熱融着層とからなるシー
トを幅方向に一軸延伸することにより、プラスチ
ツクシートに熱収縮性を付与して延伸シートを形
成し、次いでこの延伸シートの両面部を加熱しな
がら延伸シートの突条近傍を厚さ方向に圧潰する
とともに、前記両側部をプラスチツクシートの外
面側に折り曲げてくせ付けしたので次のような効
果を得ることができる。 As explained above, according to the present invention, a sheet consisting of a plastic sheet, protrusions provided along both sides of the outer surface of the plastic sheet, and a heat-adhesive layer provided on the inner surface of the plastic sheet is By uniaxially stretching the plastic sheet in the direction, heat shrinkability is imparted to the plastic sheet to form a stretched sheet, and then, while heating both sides of the stretched sheet, the vicinity of the ridges of the stretched sheet is crushed in the thickness direction, Since the both sides are bent and shaped toward the outer surface of the plastic sheet, the following effects can be obtained.
延伸シートの突条近傍にでき易い厚肉部分が
圧潰されるので、ケーブル接続部に巻き付けた
際に両側部の合わせ目下方に間隙ができ難い。
従つて加熱収縮性を密封性に優れた熱収縮性シ
ートを得ることができる。 Since the thick portions that tend to form near the ridges of the stretched sheet are crushed, it is difficult to form gaps below the seams on both sides when the sheet is wrapped around the cable connection.
Therefore, a heat-shrinkable sheet with excellent heat-shrinkability and sealing properties can be obtained.
延伸シートを両側部を予め外面部に折り曲げ
てくせ付けを施すので、接続部に巻き付ける際
に両側部の突き合わせ作業が容易であり、か
つ、折り曲げによつて生ずる角部が相互に密着
しあうので、合わせ目下方の間隙の発生を防止
する。従つて接続部への装着作業性および密封
性の優れた熱収縮性シートを得ることができ
る。 Since both sides of the stretched sheet are pre-folded to the outer surface and shaped, it is easy to butt the both sides together when wrapping the sheet around the connection part, and the corners created by the bending are in close contact with each other. , to prevent the formation of a gap below the seam. Therefore, it is possible to obtain a heat-shrinkable sheet with excellent installation workability and sealing performance at the connection portion.
第１図〜第５図は、従来の熱収縮性シートを示
すもので、第１図は斜視図、第２図は使用方法を
説明する斜視図、第３図および第４図は製造工程
を説明する横断面図、第５図は第２図のＶ−Ｖ線
に沿う矢視図、第６図〜第１３図は本発明の一実
施例を示し、第６図〜第９図は熱収縮性シートの
製造工程を説明する横断面図、第１０図は熱収縮
性シートの斜視図、第１１図〜第１３図は、作用
を説明するための接続部巻き付け状態の横断面図
である。
５……ケーブル、６……接続部、７……棒状部
材、８……クリツプ、１０……プラスチツクシー
ト、１１……突条、１２Ａ……モールドシート、
１２Ｂ……シート、１２Ｃ……延伸シート、１２
Ｄ……ケーブル接続用熱収縮性シート、１３……
熱融着層、Ｘ……合わせ目、Ｙ……間隙、Ｚ……
角部。
Figures 1 to 5 show conventional heat-shrinkable sheets, with Figure 1 being a perspective view, Figure 2 being a perspective view explaining how to use it, and Figures 3 and 4 showing the manufacturing process. 5 is a cross-sectional view taken along line V-V in FIG. 2, FIGS. 6 to 13 show an embodiment of the present invention, and FIGS. FIG. 10 is a perspective view of the heat-shrinkable sheet, and FIGS. 11 to 13 are cross-sectional views of the connecting portion wrapped around it to explain the action. . 5... Cable, 6... Connecting portion, 7... Rod-shaped member, 8... Clip, 10... Plastic sheet, 11... Projection, 12A... Mold sheet,
12B...Sheet, 12C...Stretched sheet, 12
D...Heat-shrinkable sheet for cable connection, 13...
Thermal adhesive layer, X... Seam, Y... Gap, Z...
Corner.
Claims (1)
クシートの外面の両側縁に沿つて設けられた突条
１１，１１と、前記プラスチツクシートの内面に
設けられた熱融着層１３とからなるシート１２Ｂ
を幅方向に一軸延伸することにより、前記プラス
チツクシートに熱収縮性を付与して延伸シート１
２Ｃを形成し、次いでこの延伸シートの両側部を
加熱しながら延伸シートの突条近傍を厚さ方向に
圧潰するとともに、前記両側部を前記プラスチツ
クシートの外面側に折り曲げてくせ付けすること
を特徴とするケーブル接続用熱収縮性シートの製
造方法。1. A sheet 12B consisting of a plastic sheet 10, protrusions 11, 11 provided along both sides of the outer surface of the plastic sheet, and a heat sealing layer 13 provided on the inner surface of the plastic sheet.
By uniaxially stretching the plastic sheet in the width direction, heat shrinkability is imparted to the plastic sheet to form the stretched sheet 1.
2C, and then crushing the vicinity of the ridges of the stretched sheet in the thickness direction while heating both sides of the stretched sheet, and bending the both sides toward the outer surface of the plastic sheet to form a shape. A method for manufacturing a heat-shrinkable sheet for cable connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7521883A JPS59199213A (en) | 1983-04-28 | 1983-04-28 | Preparation of thermally shrinkable sheet for connecting cables |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7521883A JPS59199213A (en) | 1983-04-28 | 1983-04-28 | Preparation of thermally shrinkable sheet for connecting cables |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59199213A JPS59199213A (en) | 1984-11-12 |
| JPH032051B2 true JPH032051B2 (en) | 1991-01-14 |
Family
ID=13569853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7521883A Granted JPS59199213A (en) | 1983-04-28 | 1983-04-28 | Preparation of thermally shrinkable sheet for connecting cables |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59199213A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016179616A (en) * | 2015-03-24 | 2016-10-13 | 株式会社関電工 | Coating method of sheet having heat shrinking function |
-
1983
- 1983-04-28 JP JP7521883A patent/JPS59199213A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59199213A (en) | 1984-11-12 |
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