JPS5983623A - Preparation of heat shrinkable crosslinked polyethylene sheet - Google Patents

Preparation of heat shrinkable crosslinked polyethylene sheet

Info

Publication number
JPS5983623A
JPS5983623A JP19334582A JP19334582A JPS5983623A JP S5983623 A JPS5983623 A JP S5983623A JP 19334582 A JP19334582 A JP 19334582A JP 19334582 A JP19334582 A JP 19334582A JP S5983623 A JPS5983623 A JP S5983623A
Authority
JP
Japan
Prior art keywords
sheet
polyethylene sheet
crosslinked polyethylene
cross
stretching
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.)
Pending
Application number
JP19334582A
Other languages
Japanese (ja)
Inventor
Hideo Suzuki
秀雄 鈴木
Kosaku Nakano
中野 耕作
Teruyuki Tsujita
照之 辻田
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.)
Fujikura Ltd
Original Assignee
Fujikura 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 Fujikura Ltd filed Critical Fujikura Ltd
Priority to JP19334582A priority Critical patent/JPS5983623A/en
Publication of JPS5983623A publication Critical patent/JPS5983623A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06Making preforms having internal stresses, e.g. plastic memory
    • B29C61/10Making preforms having internal stresses, e.g. plastic memory by bending plates or sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06Making preforms having internal stresses, e.g. plastic memory
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04Polymers of ethylene
    • B29K2023/06PE, i.e. polyethylene

Landscapes

  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

PURPOSE:To prepare the titled polyethylene sheet having an arbitrary thickness and degree of shrinkage while using inexpensive equipment, by stretching a crosslinked polyethylene sheet formed by chemical crosslinking. CONSTITUTION:To 100pts.wt. of low density polyethylene (A), about 0.9pts.wt. of a crosslinking agent (e.g., dicumyl peroxide) (b), about 1pts.wt. of a stabilizer (C) and about 2.6pts.wt. of an additive such as carbon black are compounded and the obtained resin composition is molded under pressure and heating by a predetermined heat press mold to form a chemically crosslinked polyethylene sheet (e.g., a sheet having ribs 2 at both end parts thereof) which is, in turn, stretched about 10 times toward an arrow to obtain a heat shrinkable crosslinked polyethylene sheet. In addition, after the above mentioned sheet 1 is rounded into a tubular shape, mutually abutted rib parts 2, 2 are adhered by a clip 3 to be capable of obtaining a tube shrunk to the radius direction thereof.

Description

【発明の詳細な説明】 この発明は熱収縮性を有する架橋ポリエチレンシートの
製造方法に存するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention resides in a method for producing a heat-shrinkable crosslinked polyethylene sheet.

近時ケーブルの接続部や鋼管の防食等の目的で、熱収縮
性ポリエチレン成形品が多く使用されてきているが、装
着の容易性や、解体の自由性を持つた形状のものとして
は例えば第1図に見るようにシート本体部1の両端に前
記本体部に平行でかつ内方向に突出したリブ2tl−有
する架橋ポリエチレンシートラ作り、これを矢印方向即
ちシート本体部10幅方向に延伸(仮想線に示す)した
後これを第2図のように丸めてシート本体部1の両端の
リブ2をつき合せ、これに外方向からクリップ3で嵌着
一体化するように成形体を構成し、延伸されたシートの
記憶回復効果によって半径方向に加熱収縮性を有し、か
つクリップによシ自由に解体できるような本のが出現し
ている。
Recently, heat-shrinkable polyethylene molded products have been widely used for purposes such as corrosion protection for cable connections and steel pipes. As shown in Figure 1, a cross-linked polyethylene sheet laminate having ribs 2tl-- parallel to the main body and inwardly protruding at both ends of the sheet main body 1 is made, and stretched in the direction of the arrow, that is, in the width direction of the sheet main body 10 (imaginary line). After rolling it up as shown in Figure 2, the ribs 2 at both ends of the sheet main body 1 are brought together, and the molded body is constructed by fitting and integrating the ribs 2 at both ends of the sheet body 1 from the outside with clips 3. Books have appeared that have heat-shrinkability in the radial direction due to the memory recovery effect of the sheets and can be freely disassembled using clips.

又、同様な製品を作る他の手段としては例えば第3図に
見られるようにリブになる1対の突起2′を有する架橋
ポリエチレンパイプ1′を作り、パイプ内から流体圧を
加えて半径方向に膨張させ、これを前記l対の突起2′
がシート1′の端部となるように切断して(4は切断線
を示す)第4図に見るようにリブ付シートを製造し、第
2図に準じてクリップと組合せて円管状になし、使用さ
れていた。
Another way to make a similar product is to make a cross-linked polyethylene pipe 1' having a pair of protrusions 2' that serve as ribs, as shown in Figure 3, and apply fluid pressure from inside the pipe to create a radial and expand it into the l pair of protrusions 2'.
Cut the sheet 1' so that it becomes the end (4 indicates the cutting line) to produce a ribbed sheet as shown in Figure 4, and combine it with a clip as shown in Figure 2 to make it into a circular tube shape. , was used.

←。←.

しかしこれらに於て共通していえることは架橋方法はす
べて電子線照射によるもので、化学架橋は全く用いられ
ていなかった。
However, a common feature in all of these is that the crosslinking method used was all by electron beam irradiation, and chemical crosslinking was not used at all.

化学架橋が用いられなかった理由は、有機過酸化物を架
橋剤として用い、加熱によってこの有機過酸化物を分解
させ、ポリエチレンを架橋させるという化学反応によら
なければならないため、それなりの架橋装置を必要とし
、又、架橋に時間がかかること及び連続生産には不向で
あると考えられていたためである。
The reason why chemical crosslinking has not been used is that it requires a chemical reaction in which an organic peroxide is used as a crosslinking agent, the organic peroxide is decomposed by heating, and polyethylene is crosslinked. This is because crosslinking was considered to be time-consuming and unsuitable for continuous production.

本発明者はこのような状況の中で種々検討の結果、電子
線照射法による従来の方法では照射設備が高価であり、
ポリエチレンの押出と電子線照射とシートの延伸とを連
続的に行なわんとすると設備イ¥が一層高価となり、結
局製造の連続化は困難である。
As a result of various studies under these circumstances, the present inventor found that the conventional method using electron beam irradiation requires expensive irradiation equipment;
If polyethylene extrusion, electron beam irradiation, and sheet stretching are carried out continuously, the equipment becomes more expensive, and in the end, it is difficult to achieve continuous production.

又、ポリエチレンシートを架橋して延伸するが、電子線
照射では厚さ6藺が通常の照射装置では限界であシ、こ
れを例えば6倍に延伸すれば厚さは■□となシ、結局極
めて薄いものしかM造できない。云い換えると電子線の
透過の深さに限界75;あるのでこれによって延伸前の
ポ)ノエチレンクートの厚さが定まり、延伸後の肉厚力
よきまると、自動的に延伸倍率も定まるので従って々圧
(生前の肉厚を余り厚くできず、高収縮率の成形E留〃
;得にくい。
In addition, when polyethylene sheets are crosslinked and stretched, a thickness of 6 mm is the limit for ordinary irradiation equipment when irradiating electron beams, so if this is stretched, for example, 6 times, the thickness becomes ■□. Only extremely thin items can be manufactured using M. In other words, there is a limit 75 to the depth of penetration of the electron beam, so this determines the thickness of the polyethylenecut before stretching, and if the thickness after stretching is determined, the stretching ratio is automatically determined. Therefore, it is difficult to make the wall thickness too thick during life, and the molding E part with a high shrinkage rate.
;Hard to obtain.

本発明は以上のような状況に鑑みてなされたもので、化
学架橋にニジ架橋ポリエチレンシートを製造し、このシ
ートを延伸することにより熱収縮性ポリエチレンシート
を製造する方法にして、電子線照射法の如く高価な照射
設備を必要とせず、かつ電子線照射と異なり電子線の透
過性さなどのような制約安置がないので延伸前の架橋ポ
リエチレンシートを自由な肉厚にすること力;でき、従
って任意の大きさだけ延伸することにより、任意の肉厚
を有する任意の収縮率の、lr IJエチレンシートが
得られる。
The present invention has been made in view of the above-mentioned circumstances, and is a method of manufacturing a heat-shrinkable polyethylene sheet by chemically crosslinking a crosslinked polyethylene sheet and stretching this sheet, and employing an electron beam irradiation method. Unlike electron beam irradiation, there is no need for expensive irradiation equipment such as electron beam irradiation, and there are no restrictions such as transparency of the electron beam, so the crosslinked polyethylene sheet before stretching can be made into any thickness; Therefore, by stretching an arbitrary amount, an lr IJ ethylene sheet having an arbitrary wall thickness and an arbitrary shrinkage ratio can be obtained.

なお本発明の実施に当っては熱プレスにより延伸前架橋
し、稜に延伸する2ζツチ方式による妙1、押出機内で
押出しと架橋とを行ない、押出直後に連続的に延伸する
連続方式によるかもしくは、押出直後に連続的に架橋と
延伸を行なう連続方式によるなど各種の方法があるがそ
のいづれでもよい。
In carrying out the present invention, a 2ζ Tsuchi method is used in which cross-linking is performed before stretching using a hot press and stretching is carried out along the edges, and a continuous method is employed in which extrusion and cross-linking are performed in an extruder and continuous stretching is performed immediately after extrusion. Alternatively, there are various methods such as a continuous method in which crosslinking and stretching are performed continuously immediately after extrusion, and any of these methods may be used.

1−かしどちらかと云えば最初に記した・ぐツチ方式が
設備費も安価で、−回のホットプレスによって多数個を
生産する多数個数シを行なえば架橋に要する時間の長さ
全力/々−できて有利である。
1-However, if anything, the equipment cost of the first-mentioned Kutsuchi method is low, and if a large number of pieces are produced by hot pressing several times, the length of time required for crosslinking can be reduced to the fullest. -It is advantageous to be able to do so.

又、通常収縮性シートの裏面にはエチレン酢ビ共重合体
の如き接着剤や架橋剤を含まない融着性ポリエチレンR
k多層押出の如き手法で作ることも或はそれぞれ別工程
で作ることも可能である。
In addition, the back side of the shrinkable sheet is usually made of a fusible polyethylene R that does not contain adhesives or crosslinking agents such as ethylene vinyl acetate copolymer.
It is also possible to make them by a method such as multilayer extrusion, or by using separate processes.

次に本発明の実施例について述べる。Next, examples of the present invention will be described.

低密度ポリエチレン100重量部と、ジクミルの型の熱
プレスによシ架橋し、第1図に示した如きリブ付架橋ポ
リエチレンシートを製造し、その下面(丸めたときに内
面となる側)−にエチレン酢ビ共重合体を添着し、しか
る後シートを第2図の矢印方向にio倍に延伸した後丸
めてリブをクリップで固着し、熱収縮性ポリエチレンシ
ートを製造した。
100 parts by weight of low-density polyethylene was cross-linked using a dicumyl type hot press to produce a ribbed cross-linked polyethylene sheet as shown in Figure 1. An ethylene-vinyl acetate copolymer was attached thereto, and the sheet was stretched io times in the direction of the arrow in FIG. 2, rolled up, and the ribs were fixed with clips to produce a heat-shrinkable polyethylene sheet.

実施例2 中密度ポリエチレン100重量部と、−)クミルターシ
ャリブチルパーオキサイド0・8重量部と安定剤1重世
部と、力−ゼンブラック2・6重量部とを配付した混和
物を所定グイ型を有する押出機により架橋、押出成型し
て、リプ付架橋ポリエチレンシート?製造し、これに架
橋剤を含有してない中密度ポリエチレンを熱融着した後
、このシートを幅方向に延伸しシートとした。
Example 2 A mixture containing 100 parts by weight of medium-density polyethylene, 0.8 parts by weight of cumyl tert-butyl peroxide, 1 part by weight of a stabilizer, and 2.6 parts by weight of Torzen Black was prepared. A cross-linked polyethylene sheet with a lip formed by cross-linking and extrusion molding using an extruder with a gooey mold? This sheet was produced, and after heat-sealing medium density polyethylene containing no crosslinking agent thereto, this sheet was stretched in the width direction to form a sheet.

本発明の実施に際し、使用されるポリエチレンは高圧法
ポリエチレンであってもよい。又、架橋剤は過酸化物例
えば過酸化4ンゾイル、過酸化ジクロルベンゾイル、ジ
クミルパーオキサイド、ジ−t−ブチルパーオキサイド
、2.5−ジ()ぞ−オキシベンゾエート)ヘキシン−
3,1・3−ビス(t−ブチルパぞ−オキシイソゾロビ
ルンベン゛ゼン、之つロイル/ぐ一オキサイド、t−ブ
チルパぞ−アセテート、2.5ジメチル−2,5−ジ(
t−ブチルパぐ−オキシ)ヘキシン−3、2,5ジメチ
ル−2,5−ジ(t−ブチルノミ−オキシ)ヘキサノお
よび1−ブチルパーベンゾエート並びにアゾ化合物例え
ばアゾビス−イソブチロニトリル、ジメチルアゾジイソ
ブチレヅートなどの如く分解湯度が】画描であれば数多
くのものが使用することができる。
In practicing the present invention, the polyethylene used may be high pressure polyethylene. Further, the crosslinking agent may be a peroxide such as 4-benzoyl peroxide, dichlorobenzoyl peroxide, dicumyl peroxide, di-t-butyl peroxide, 2,5-di()zo-oxybenzoate)hexyne-
3,1,3-bis(t-butylpazo-oxyisozolobyrnbenzene, t-butylpazo-acetate, 2.5-dimethyl-2,5-di(
tert-butylp-g-oxy)hexyne-3,2,5 dimethyl-2,5-di(t-butylnomi-oxy)hexano and 1-butyl perbenzoate and azo compounds such as azobis-isobutyronitrile, dimethylazodiisobutylene Many materials can be used for painting, such as those with a decomposition temperature such as zuto.

又、実施例以外に各種の変形実施例を考えることができ
る。
Moreover, various modified embodiments can be considered in addition to the embodiments.

以上の如く本発明によれば化学架橋による熱収縮性シー
ト1比較的容易に製造することが可能であり、これによ
って従来の電子線照射による熱収縮性シートでは限界の
あったシートの厚みの制限を撤去することができた。
As described above, according to the present invention, it is possible to relatively easily produce a heat-shrinkable sheet 1 by chemical crosslinking, and thereby the thickness of the sheet can be limited, which was the limit with the conventional heat-shrinkable sheet by electron beam irradiation. was able to remove it.

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

図は熱収縮性ポリエチレン成形品の製造過程の例示で、 第1図は両端にリブ付架橋ポリエチレンシートの横断面
図、 第2図はこれを用−た成形体の横断面図、第3図は架橋
ポリエチレンノ々イブの横断面図、第4図はこれを用い
てJ!!!遺したリプ付架橋ポリエチレンシートの横断
面図である。 代理人 弁理士  竹 内   9 第1 第2 第3 第4
The figures show an example of the manufacturing process of a heat-shrinkable polyethylene molded article. Figure 1 is a cross-sectional view of a cross-linked polyethylene sheet with ribs on both ends, Figure 2 is a cross-sectional view of a molded article using this sheet, and Figure 3 is a cross-sectional view of a cross-linked polyethylene sheet with ribs on both ends. is a cross-sectional view of a cross-linked polyethylene knob, and Figure 4 shows J! ! ! It is a cross-sectional view of the cross-linked polyethylene sheet with a lip left behind. Agent Patent Attorney Takeuchi 9th 1st 2nd 3rd 4th

Claims (1)

【特許請求の範囲】 (+1  架橋剤人ポリエチレンをシートに成形し加熱
架橋せしめた彼、収縮性を付与すべき方向に延伸加工す
ることを%徴とする収縮性架橋ポリエチレンシートの製
造方法 (2)架橋と延伸が別工程で行なわれる特許請求の範囲
第1項記載の収縮性架橋ポリエチレンシートの製造方法 (3)架橋と延伸が連続工程で行なわれる特許請求の範
囲第1項記載の収縮性架橋ポリエチレンの製造方法
[Claims] (+1. A method for producing a shrinkable cross-linked polyethylene sheet, which comprises forming polyethylene into a sheet as a cross-linking agent and cross-linking it by heating. ) A method for manufacturing a shrinkable crosslinked polyethylene sheet according to claim 1, in which crosslinking and stretching are performed in separate steps; (3) A shrinkable method according to claim 1, in which crosslinking and stretching are performed in a continuous process. Method for producing crosslinked polyethylene
JP19334582A 1982-11-05 1982-11-05 Preparation of heat shrinkable crosslinked polyethylene sheet Pending JPS5983623A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19334582A JPS5983623A (en) 1982-11-05 1982-11-05 Preparation of heat shrinkable crosslinked polyethylene sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19334582A JPS5983623A (en) 1982-11-05 1982-11-05 Preparation of heat shrinkable crosslinked polyethylene sheet

Publications (1)

Publication Number Publication Date
JPS5983623A true JPS5983623A (en) 1984-05-15

Family

ID=16306349

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19334582A Pending JPS5983623A (en) 1982-11-05 1982-11-05 Preparation of heat shrinkable crosslinked polyethylene sheet

Country Status (1)

Country Link
JP (1) JPS5983623A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62242518A (en) * 1986-04-16 1987-10-23 Fujikura Ltd Manufacture of heat-shrinkable sheet
JPH06312454A (en) * 1993-02-03 1994-11-08 Fujikura Ltd Production of heat-shrinkable article

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62242518A (en) * 1986-04-16 1987-10-23 Fujikura Ltd Manufacture of heat-shrinkable sheet
JPH06312454A (en) * 1993-02-03 1994-11-08 Fujikura Ltd Production of heat-shrinkable article

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