JPH031142B2 - - Google Patents
Info
- Publication number
- JPH031142B2 JPH031142B2 JP19053682A JP19053682A JPH031142B2 JP H031142 B2 JPH031142 B2 JP H031142B2 JP 19053682 A JP19053682 A JP 19053682A JP 19053682 A JP19053682 A JP 19053682A JP H031142 B2 JPH031142 B2 JP H031142B2
- Authority
- JP
- Japan
- Prior art keywords
- sides
- sheet
- heat
- parts
- ribs
- 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
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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】
この発明は、ケーブルの接続部を被覆するため
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 for manufacturing a heat-shrinkable sheet used for covering cable connections.
一般にケーブルとケーブルとを接続した場合に
形成される接続部を密封する方法の一つとして、
第1図に示すようにケーブル1の接続部1aにス
ペーサ2、アルミスリーブ3等を介して縦割り状
の熱収縮性シート4を被せ、複数のクリツプ5等
で両側部を挟んで加熱収縮させることが行なわれ
ている。この熱収縮性シート4はケーブル1の周
方向に収縮性を有するシート本体6と、このシー
ト本体6の両側部の外面に突出形成されたリブ
7,7とから構成され、また内面には熱融着等の
接着性が付与されたものである。 One way to seal the connection that is generally formed when connecting cables is to
As shown in Fig. 1, a longitudinally split heat-shrinkable sheet 4 is placed over the connecting part 1a of the cable 1 via a spacer 2, an aluminum sleeve 3, etc., and the both sides are held between a plurality of clips 5, etc., and the sheet is heat-shrinked. things are being done. This heat-shrinkable sheet 4 is composed of a sheet main body 6 that has shrinkability in the circumferential direction of the cable 1, and ribs 7, 7 formed protrudingly on the outer surface of both sides of the sheet main body 6. It has adhesive properties such as fusion bonding.
従来この熱収縮性シートの製造方法としては、
幅方向(ケーブルの周方向)に可能な限り均一な
収縮性を付与するようにしている。例えば第2図
に示すように、心金8の上に長さ方向(巻き付け
方向)に予め均一な収縮性を有する架橋延伸プラ
スチツクテープを多重巻きしてシート本体6を形
成し、この上にリブ7を接着する。そしてリブ7
の中心から第2図Bのイ−イ線で示すように軸方
向に切り裂いて、二分割されたリブ7,7の付近
を各々90゜づつ離反する方向に曲げてくせ付けを
し、縦割り状の熱収縮性シート4を得るものであ
る。 Conventionally, the method of manufacturing this heat-shrinkable sheet is as follows:
The aim is to provide as uniform shrinkage as possible in the width direction (circumferential direction of the cable). For example, as shown in FIG. 2, a sheet body 6 is formed by wrapping a cross-linked stretched plastic tape with uniform shrinkability multiple times in advance in the length direction (wrapping direction) on a mandrel 8, and then ribs are placed on the sheet body 6. Glue 7. and rib 7
Cut it in the axial direction from the center as shown by line A-A in Figure 2B, bend the two halves near the ribs 7, 7 in a direction that separates each other by 90 degrees, and then split it vertically. A heat-shrinkable sheet 4 having a shape is obtained.
しかしながらこのような方法において製造した
熱収縮性シートは、全幅方向に均一な収縮性が与
えられるものであるが、第3図に示すように接続
部1aに被せた際に、熱収縮性シート4自体の弾
性作用によつて、両側部の内面相互の合わせ目9
付近に間隙10ができ易い。従つてこの間隙10
を除去して合わせ目9の両側付近の内面を接続部
1aの周面に接着させるために、クリツプ5の挾
持方法や加熱収縮作業に熟練性が要求され、作業
性を低下させるという問題点がある。 However, although the heat-shrinkable sheet manufactured by such a method has uniform shrinkability in the entire width direction, when it is placed over the connecting portion 1a as shown in FIG. Due to its elastic action, the seam 9 between the inner surfaces of both sides
A gap 10 is likely to be formed nearby. Therefore, this gap 10
In order to remove the inner surface of the joint 9 on both sides and adhere it to the circumferential surface of the connecting portion 1a, skill is required in the method of holding the clip 5 and the heat shrinking operation, which poses the problem of reducing work efficiency. be.
この発明は前記の事情を背景になされたもので
あり、加熱収縮作業の効率を向上させるとともに
密封性の優れた熱収縮性シートの製造方法を提供
することを目的とするもので、シート本体の両側
部の肉厚を他の部分より厚く形成しておき、次い
で全体の肉厚を均一化する如くシート本体を幅方
向に一軸延伸して、両側部に他の部分以上の収縮
率を付与することを象徴とするものである。 This invention was made against the background of the above-mentioned circumstances, and aims to provide a method for manufacturing a heat-shrinkable sheet that improves the efficiency of heat-shrinking work and has excellent sealing properties. The wall thickness on both sides is made thicker than other parts, and then the sheet body is uniaxially stretched in the width direction so as to make the entire wall thickness uniform, giving both sides a higher shrinkage rate than other parts. It is a symbol of that.
以下この発明を第4図〜第7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. 4 to 7.
まず未架橋ポリエチレン等からなるシート本体
11およびリブ12,12を押し出し成形するな
どして、第4図に示すような両側部11a,11
aの肉厚が他の部分より厚い断面形状のシートを
形成する。次にリブ12,12が突出する一方の
面側から高エネルギー放出線を照射して、シート
本体11およびリブ12,12を一体に架橋させ
る。しかる後にシート本体11を幅方向に一軸延
伸する。この延伸の際に、本発明者の研究によれ
ば、リブ12,12の付け根付近の両側部11
a,11aは、引張力が集中的に作用し易く、他
の部分より大きく延伸される傾向を示す。そこで
この現象を利用して、例えば急激な引張力を加え
た後に一定した張力を加えるなどの方法により、
両側部11a,11aが他の部分より大きく延伸
されて他の部分と同等の肉厚に達するまでシート
本体11を延伸する。また前記の方法で不十分な
場合は、全体が均一な厚さになるまで両側部のみ
を特に延伸させるようにする(第5図参照)。こ
のようにして全体の肉厚を均一化すると、シート
本体11の両側部11a,11aに他の部分以上
の収縮率が付与された熱収縮性シート13が得ら
れるものである。またこの場合、シート本体11
の他方の面は架橋されないので自ずと熱融着性を
有するものであるが、熱融着型の接着剤あるいは
常温粘着性の粘着剤等を塗布するようにしてもよ
い。 First, the sheet main body 11 and the ribs 12, 12 made of uncrosslinked polyethylene or the like are extruded to form both side parts 11a, 11 as shown in FIG.
A sheet having a cross-sectional shape in which the wall thickness at a portion a is thicker than other portions is formed. Next, high-energy radiation is irradiated from one side from which the ribs 12, 12 protrude to bridge the sheet body 11 and the ribs 12, 12 together. Thereafter, the sheet body 11 is uniaxially stretched in the width direction. During this stretching, according to the research of the present inventor, both sides 11 near the bases of the ribs 12, 12
a and 11a tend to be subjected to concentrated tensile force and tend to be stretched more than other parts. Therefore, by utilizing this phenomenon, for example, by applying a sudden tensile force and then applying a constant tension,
The sheet body 11 is stretched until the side parts 11a, 11a are stretched more than the other parts and reach the same thickness as the other parts. If the above-mentioned method is insufficient, only the both sides may be stretched until the entire thickness is uniform (see FIG. 5). By making the overall thickness uniform in this way, a heat-shrinkable sheet 13 can be obtained in which both sides 11a, 11a of the sheet main body 11 have a higher shrinkage rate than other parts. In this case, the seat body 11
Since the other side is not cross-linked, it naturally has heat-fusible properties, but it may be coated with a heat-fusible adhesive or a pressure-sensitive adhesive that is sticky at room temperature.
このような方法で製造した熱収縮性シート13
は、スペーサ2、アルミスリーブ3等を介して接
続部1aにリブ12,12が突出する一方の面を
外側にして巻き付け、両側部11a,11aの内
面を相対向させてクリツプ5等で挟んで使用す
る。この時、従来の熱収縮性シートと同様に両側
部11a,11aの合わせ目9付近に間隙10が
でき易いのはもちろんであるが、この発明ではシ
ート本体11の両側部11a,11aが他の部分
以上の収縮率を付与されることによつて、他の部
分との間に収縮率の差が生じ、この収縮率の差を
利用して、加熱収縮の際に合わせ目9付近の間隙
10を除去するようにできるものである。 Heat-shrinkable sheet 13 manufactured by such a method
is wrapped around the connecting part 1a through the spacer 2, aluminum sleeve 3, etc. with one side where the ribs 12, 12 protrude outward, and sandwiched between the clips 5, etc. with the inner surfaces of both side parts 11a, 11a facing each other. use. At this time, it goes without saying that a gap 10 is likely to be formed near the seam 9 of the both side parts 11a, 11a, similar to the conventional heat-shrinkable sheet, but in this invention, the both sides 11a, 11a of the sheet main body 11 are By applying a shrinkage rate higher than that of the part, a difference in shrinkage rate occurs between the parts and other parts, and by utilizing this difference in shrinkage rate, the gap 10 near the seam 9 is closed during heat shrinkage. It is something that can be done to remove.
例えば第5図に示すロの範囲がもとの寸法の60
%に、また両側部11a,11a付近ハの範囲が
もとの寸法の50%に収縮するとすれば、この10%
の相対差が利用できるものである。これらの説明
を簡略化するために第6図において両側部11
a,11aの相対的な収縮だけを考えれば、AB
およびEFの寸法loはl=(50/60)loに収縮し、
ABCDEFの形状は二点鎖線で示すA′BCDEF′の
ように変化する。いい変えればA′BCDEF′で囲む
面積は、loからlに減少することにより
ABCDEFで囲む面積の50/60程度となる.この場
合にABCDEFで囲む面積中、間隙10の占める
面積の割合が10/60以下であつたとすると、両側
部11a,11aの厚さは長さの減少分に逆比例
して増加し、両側部11a,11aの占める面積
は変化しないはずであるから、間隙10の部分
に、両側部11a,11aが入り込む結果として
間隙10が除去されることになる。従つて合わせ
目9の両側付近の内面は、接続部1aの周面に緊
密に接着し、接続部1aの周面全体を密封するこ
とができるものである(第7図参照)。 For example, the range B shown in Figure 5 is 60% of the original dimension.
%, and if the range of both sides 11a and 11a vicinity C shrinks to 50% of its original size, this 10%
The relative difference of can be used. In order to simplify these explanations, both sides 11 are shown in FIG.
Considering only the relative contraction of a and 11a, AB
and the dimension lo of EF shrinks to l = (50/60)lo,
The shape of ABCDEF changes as shown by the two-dot chain line A′BCDEF′. In other words, the area surrounded by A′BCDEF′ decreases from lo to l.
It will be about 50/60 of the area enclosed by ABCDEF. In this case, if the ratio of the area occupied by the gap 10 in the area surrounded by ABCDEF is 10/60 or less, the thickness of both sides 11a, 11a increases in inverse proportion to the decrease in length, and Since the area occupied by 11a, 11a should not change, the gap 10 will be removed as a result of the both sides 11a, 11a entering the gap 10. Therefore, the inner surfaces near both sides of the seam 9 can be tightly adhered to the circumferential surface of the connecting portion 1a, and the entire circumferential surface of the connecting portion 1a can be sealed (see FIG. 7).
なお両側部と他の部分との収縮率の差は、シー
ト本体を延伸加工する前の両側部と他の部分との
肉厚の差によつて決まるものである。従つて間隙
の面積を考慮して両側部の肉厚を設定するように
すれば、より効果的である。 The difference in shrinkage rate between both sides and other parts is determined by the difference in wall thickness between both sides and other parts before the sheet main body is stretched. Therefore, it is more effective to set the wall thickness of both sides in consideration of the area of the gap.
以上説明したように、この発明によれば、次の
ような効果が得られるものである。 As explained above, according to the present invention, the following effects can be obtained.
シート本体の両側部の肉厚を他の部分より厚
く形成しておき、このシート本体を延伸する際
に両側部に集中的に引張力を作用させて全体の
肉厚を均一化し、これによつて両側部に他の部
分以上の収縮率を付与することができ、両側部
と他の部分との収縮率の相対差を利用して両側
部の合わせ目付近にでき易い間隙を除去するよ
うにしたので、密封性の優れた熱収縮性シート
を得ることができる。 The thickness of both sides of the sheet body is made thicker than the other parts, and when the sheet body is stretched, tensile force is concentratedly applied to both sides to make the overall thickness uniform. Therefore, it is possible to give both sides a higher shrinkage rate than other parts, and the relative difference in shrinkage rate between both sides and other parts can be used to eliminate gaps that tend to form near the joints of both sides. Therefore, a heat-shrinkable sheet with excellent sealing properties can be obtained.
シート本体の両側部に他の部分以上の収縮率
を付与することができるので、加熱収縮作業の
効率がよい熱収縮性シートを得ることができ
る。 Since it is possible to give both sides of the sheet body a higher shrinkage rate than other parts, it is possible to obtain a heat-shrinkable sheet with high efficiency in heat-shrinking work.
第1図は熱収縮性シートの使用状態を説明する
斜視図、第2図A〜Dは従来の製造方法の一例の
説明図、第3図は第1図の−線に沿う矢視
図、第4図〜第7図は本発明の一実施例を示すも
ので、第4図および第5図は製造工程の説明図、
第6図および第7図は本発明に係る製造方法の作
用の説明図である。
11……シート本体、11a……側部、12…
…リブ、13……熱収縮性シート。
FIG. 1 is a perspective view illustrating the state of use of a heat-shrinkable sheet, FIGS. 2A to D are explanatory diagrams of an example of a conventional manufacturing method, and FIG. 3 is a view taken along the - line in FIG. Figures 4 to 7 show an embodiment of the present invention, and Figures 4 and 5 are explanatory diagrams of the manufacturing process;
FIG. 6 and FIG. 7 are explanatory diagrams of the operation of the manufacturing method according to the present invention. 11... Seat body, 11a... Side part, 12...
...Rib, 13...Heat-shrinkable sheet.
Claims (1)
11aにリブ12,12を突出形成するととも
に、前記リブに近接する両側部の肉厚を他の部分
以上の厚さに形成し、次いで全体の肉厚を均一化
する如く前記シート本体を幅方向に一軸延伸し
て、両側部に他の部分以上の収縮率を付与するこ
とを特徴とする熱収縮性シートの製造方法。1 Both sides 11a of one side of the seat body 11,
11a, protruding ribs 12, 12 are formed, and the thickness of both sides near the ribs is thicker than the other parts, and then the sheet body is shaped in the width direction so as to make the entire thickness uniform. 1. A method for producing a heat-shrinkable sheet, which comprises uniaxially stretching the sheet to give both sides a higher shrinkage rate than the other parts.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19053682A JPS5979733A (en) | 1982-10-29 | 1982-10-29 | Preparation of heat-shrinkable sheet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19053682A JPS5979733A (en) | 1982-10-29 | 1982-10-29 | Preparation of heat-shrinkable sheet |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5979733A JPS5979733A (en) | 1984-05-09 |
JPH031142B2 true JPH031142B2 (en) | 1991-01-09 |
Family
ID=16259715
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19053682A Granted JPS5979733A (en) | 1982-10-29 | 1982-10-29 | Preparation of heat-shrinkable sheet |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5979733A (en) |
-
1982
- 1982-10-29 JP JP19053682A patent/JPS5979733A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5979733A (en) | 1984-05-09 |
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