JP3908328B2 - Method and apparatus for manufacturing insertion pipe - Google Patents

Method and apparatus for manufacturing insertion pipe Download PDF

Info

Publication number
JP3908328B2
JP3908328B2 JP10886997A JP10886997A JP3908328B2 JP 3908328 B2 JP3908328 B2 JP 3908328B2 JP 10886997 A JP10886997 A JP 10886997A JP 10886997 A JP10886997 A JP 10886997A JP 3908328 B2 JP3908328 B2 JP 3908328B2
Authority
JP
Japan
Prior art keywords
polyethylene
temperature
pipe
heating
diameter
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 - Fee Related
Application number
JP10886997A
Other languages
Japanese (ja)
Other versions
JPH10296857A (en
Inventor
正一 飯村
寛之 西村
博行 前羽
洋司 森
高之 黒部
宏明 田中
康二 中島
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.)
Mitsui Chemicals Inc
Tokyo Gas Co Ltd
Toho Gas Co Ltd
Original Assignee
Mitsui Chemicals Inc
Tokyo Gas Co Ltd
Toho Gas 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 Mitsui Chemicals Inc, Tokyo Gas Co Ltd, Toho Gas Co Ltd filed Critical Mitsui Chemicals Inc
Priority to JP10886997A priority Critical patent/JP3908328B2/en
Publication of JPH10296857A publication Critical patent/JPH10296857A/en
Application granted granted Critical
Publication of JP3908328B2 publication Critical patent/JP3908328B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Description

【0001】
【発明が属する技術分野】
本発明は、既設管を改修のため管内にポリエチレン管を挿入するインサーション工法において使用されるインサーションパイプの製造方法及び装置に関する。
【0002】
【従来技術】
インサーション工法は、プラスチック管を加熱して軟化させた状態で、ローラ等により押し潰して縮径し、形状回復温度以下の温度で既設管内に挿入したのち形状回復温度以上に加熱して形状復元させる方法で、特開平7−77291号には、架橋ポリエチレン管を温度上昇に伴って引張応力が急激に減少する疑似融点近傍で縮径加工したのち、昇温に伴って樹脂材料が形状回復する形状回復温度未満まで冷却する方法が開示されている。
【0003】
また特開平4−29834号には、押出しダイスから円形断面のプラスチック管を押出して、これを形状記憶のため一旦冷却固化し、ついで再加熱して軟化させた状態で縮径加工することによりインサーションパイプを1ラインで製造する方法が開示されている。
【0004】
【発明が解決しようとする課題】
インサーションパイプは上述するように、縮径加工に先立ってプラスチック管を加熱して軟化させており、加熱は通常、高温のエアやスチームを用いてプラスチック管を外部から加熱し、温度上昇に伴って引張応力が急激に低下する疑似融点近傍まで昇温させているが、昇温が高過ぎたり、或いはまた常温のプラスチック管を疑似融点近傍まで一気に昇温させようとすると、管外層部が溶融し易くなる不具合を生ずる。
【0005】
本発明の第1の目的は、上記の不具合を生ずることのないインサーションパイプの製造方法及び装置を提供しようとするものである。
インサーションパイプはまた、縮径した形状での形状記憶性がなく、縮径後、円形断面への復元性のよいものが望まれる。この点、架橋ポリエチレン管は、復元性がよく、保形性にも優れているうえクリープ変形が少ない利点があるが、押出しダイスから押出したパイプを一旦冷却固化したのち再加熱して縮径加工することによりインサーションパイプを1ラインで製造する方法には採用されていない。この理由は、架橋を樹脂が疑似融点付近に達して軟化する温度まで加熱した状態で行うと、加工前の形状記憶が失われ、円形断面に復元できなくなる不具合を生ずることにある。
【0006】
本発明の第2の目的は、押出しダイスから押出したパイプを一旦冷却固化したのち再加熱して縮径加工する方法において、縮径後、形状回復温度以上に加熱したときの復元性のよいインサーションパイプを得るための製造方法を提供しようとするものである。
【0007】
【課題の解決手段】
第1の目的を達成するため本発明者らは、ポリエチレン(ここでポリエチレン管とは、架橋度65%以上のポリエチレン管を含むものとする、以下のポリエチレン管についても同様である)を外層部を溶融しないで軟化させることのできる温度を求めて種々実験を行った結果、例えば中密度ポリエチレン管では100〜125℃、架橋ポリエチレン管では100〜130℃の範囲が適当で、これ以上の温度では外層部の溶融が見られた。
【0008】
の発明は、ポリエチレン管を二段階に分けて昇温させるものである。すなわちポリエチレン管外層部が溶融することのない温度まで肉厚方向にむらなく昇温させる予備加熱段階と、予備加熱後100〜130℃(以下、この温度を擬似融点近傍という)まで昇温させる段階とからなるものである。
【0009】
すなわち第の発明は、ポリエチレン管を加熱し、温度上昇に伴って引張応力が急激に減少する疑似融点近傍まで昇温させたのち縮径加工し、ついで縮径形状を保ちながら形状回復温度以下まで冷却するインサーションパイプの製造方法において、縮径加工に先立つポリエチレン管の加熱工程を、ポリエチレン管を80〜98℃まで予備加熱する工程と、予備加熱後、加熱手段により少なくとも表面の温度が100〜130℃となるように加熱する工程より構成することを特徴とし、本方法を実施するための装置は、ポリエチレン管を80〜98℃まで予備加熱する第1の加熱装置と、予備加熱後のポリエチレン管を少なくとも表面の温度が100〜130℃に達するまで加熱する第2の加熱装置と、昇温したポリエチレン管を押し潰して縮径加工する装置と、縮径したポリエチレン管を形状回復温度以下まで冷却する冷却装置からなることを特徴とする。
【0010】
ポリエチレン管を80〜98℃まで予備加熱する方法としては、湯に浸漬するか又はスチームにて昇温させるのが望ましい。肉厚方向にむらなく容易に昇温させることができ、また湯に浸漬させる場合、100℃を越えて加熱されることがなくなるからである。また、架橋剤を含むポリエチレン管では、この工程によって架橋を起こさせることができる。
【0011】
本方法及び装置は、常温まで冷却されたポリエチレン管を使用してもよいし、押出しダイスから押出して形状記憶のため一旦冷却固化したライン上のポリエチレン管に適用してもよい。この場合、冷却温度は後述する理由により60℃以下が望ましい。冷却温度が60℃を越える場合、縮径加工したポリエチレン管を加熱して円形断面に復元させるときの復元性が悪くなる。
【0012】
第2の目的を達成するため本発明者らが行った実験によると、樹脂の架橋は80〜100℃が適当であることが判明した。
【0013】
したがって第2の目的を達成するための第3の発明は、押出しダイスから押出した円形断面のポリエチレンパイプを一旦冷却固化し、ついで温度上昇に伴って引張り応力が急激に減少する疑似融点近傍まで再加熱したのち縮径する架橋ポリエチレン管の縮径加工方法において、縮径加工のためポリエチレン管を加熱する工程を湯又はスチームによりポリエチレン管を80〜100℃まで昇温させて架橋を起こさせる第1の加熱工程と、温度上昇に伴って引張応力が急激に減少する疑似融点近傍まで昇温させる第2工程より構成することを特徴とする。
【0014】
本発明によれば、上記温度範囲で架橋した後のポリエチレン管は、その後更に疑似融点近傍まで昇温させてから縮径加工しても縮径形状が記憶されることはなく、円形断面への復元性がよいうえ、ポリエチレン管を二段階で加熱することによって上述するように、管外層部の溶融を防ぐこともできる。
本発明者らはまた、押出しダイスから押出したポリエチレン管の冷却温度は60℃を越えると復元性が悪くなり、復元性を向上させるには60℃以下に冷却することが必要であることを見出した。
【0015】
したがって第4の発明は、押出しダイスから押出した円形断面のポリエチレンパイプを一旦冷却固化し、ついで温度上昇に伴って引張り応力が急激に減少する疑似融点近傍まで再加熱したのち縮径する架橋ポリエチレン管の縮径加工方法において、押出しダイスから押出した円形断面のポリエチレン管の冷却温度を60℃以下とすることを特徴とする。
【0016】
上記各発明において、縮径加工に先立って疑似融点近傍に達するまで行われるポリエチレン管の加熱は、例えば熱風型乾燥機を用いて行われる。この場合、ポリエチレン管に直接熱風が当たることがないように、ポリエチレン管にはフードを被せてポリエチレン管が極力均一に加熱されるようにするのが望ましい。
【0017】
【発明の実施の形態】
図1は、インサーションパイプの製造装置を示すもので、押出しダイス1と、押出ダイス1から押出した円形断面のポリエチレン管2を形状記憶させるため一旦冷却する冷却装置3と、熱湯を満たし、冷却装置3により冷却されたポリエチレン管2を予備加熱する第1の加熱装置4と、図示省略したヒータとファンよりなり、加熱装置4で予備加熱されたポリエチレン管2を加熱する第2の加熱装置としての熱風型乾燥機5と、ローラ等からなり、昇温したポリエチレン管2を縮径加工する縮径装置6と、縮径後のポリエチレン管2を冷却し、縮径状態で形状安定させる冷却装置7と、縮径されたポリエチレン管2を巻取る巻取り装置8とからなり、熱風によるポリエチレン管2の加熱時には熱風がポリエチレン管に直接当たって局部加熱されることなく均一に加熱されるようにポリエチレン管にはフードが被せられる。
【0018】
実施例図1に示す装置を用い、押出しダイス1から押出した架橋剤を含むポリエチレン管2を冷却装置3にて60℃以下に冷却し、ついで第1の加熱装置4(湯温98℃)に3分間通して80〜98℃に昇温させ、架橋させたのち、熱風型乾燥機5に送り、100〜130℃に加熱した。その後縮径装置6で円形断面のポリエチレン2を図2に示すように押し潰して縮径させたのち、冷却装置7で常温にまで冷却し、形状を保持させ縮径状態で巻取り装置8に巻取った。
【0019】
【発明の効果】
本発明は以上のように構成され、次のような効果を奏する。
請求項及び記載の製造方法及び装置によれば、予備加熱により中間温度まで一旦加熱されたのち、疑似融点近傍まで加熱され、昇温が二段階で行われるため、二段階目の加熱では加熱量が少なく、一気に疑似融点近傍まで加熱するのと比べ、ポリエチレン管外層部が溶融しにくい。
【0020】
請求項記載の製造方法によれば、インサーションパイプを1ラインで製造することができ、生産性が向上する。
請求項記載の製造方法によれば、パイプ形状で完全に形状記憶を行うことが可能となり、縮径加工したポリエチレン管を円形断面に復元させるときの復元性がよくなる。
【0021】
請求項記載の製造方法によれば、肉厚方向にむらなく容易に昇温させることができる。
請求項記載の製造方法によれば、架橋を80〜100℃で行うことにより加工前の形状記憶が失われることなく、復元性のよいインサーションパイプを製造することができる共に、二段階加熱することにより加熱時の管外層部の溶融を防ぐことができる。
【0022】
請求項記載の製造方法によれば、インサーションパイプを1ラインで製造することができるうえ、縮径加工したポリエチレン管を円形断面に復元させるときの復元性がよくなる。
【0023】
請求項記載の製造方法のように、ポリエチレン管の加熱に熱風型乾燥機を用いる場合、ポリエチレン管にフードを被せて熱風を吹き付けるようにすれば、ポリエチレン管を比較的均一に加熱することができる。
【図面の簡単な説明】
【図1】本発明に係わる製造装置の概略図。
【図2】縮径加工されたパイプの断面図。
【符号の説明】
1・・押出しダイス
2・・プラスチック管
3、7・・冷却装置
4・・第1の加熱装置
5・・熱風型乾燥機
6・・縮径装置
8・・巻取装置
[0001]
[Technical field to which the invention belongs]
The present invention relates to a method and an apparatus for manufacturing an insertion pipe used in an insertion method for inserting a polyethylene pipe into a pipe for repairing an existing pipe.
[0002]
[Prior art]
In the insertion method, the plastic tube is heated and softened, and is crushed by a roller or the like to reduce the diameter. After being inserted into the existing tube at a temperature below the shape recovery temperature, the shape is recovered by heating above the shape recovery temperature. JP-A-7-77291 discloses a method of reducing the diameter of a crosslinked polyethylene pipe in the vicinity of a pseudo-melting point where the tensile stress rapidly decreases as the temperature rises, and then the resin material recovers its shape as the temperature rises. A method of cooling to below the shape recovery temperature is disclosed.
[0003]
Japanese Patent Application Laid-Open No. 4-29834 discloses an inserter by extruding a plastic tube having a circular cross section from an extrusion die, cooling and solidifying it once for shape memory, and then reducing the diameter in a softened state by reheating. A method for manufacturing a production pipe in one line is disclosed.
[0004]
[Problems to be solved by the invention]
As described above, the insertion pipe heats and softens the plastic pipe prior to the diameter reduction processing. The heating is usually performed by heating the plastic pipe from the outside using high-temperature air or steam, and the temperature rises. The temperature rises to near the pseudo melting point where the tensile stress drops sharply. This causes a problem that is easy to do.
[0005]
The first object of the present invention is to provide an insertion pipe manufacturing method and apparatus that do not cause the above-mentioned problems.
It is also desirable that the insertion pipe has no shape memory property in a reduced diameter shape and has a good recovery property to a circular cross section after the diameter reduction. In this regard, cross-linked polyethylene pipes have the advantages of good resilience, excellent shape retention and little creep deformation, but once cooled and solidified, the pipes extruded from the extrusion dies are reheated to reduce the diameter. Therefore, it is not adopted in the method of manufacturing the insertion pipe in one line. The reason for this is that if the crosslinking is performed in a state where the resin is heated to a temperature at which the resin reaches the vicinity of the pseudo melting point and softens, the shape memory before processing is lost and a problem that the circular cross section cannot be restored occurs.
[0006]
A second object of the present invention is a method of cooling and solidifying a pipe extruded from an extrusion die and then reheating it to reduce the diameter. After the diameter reduction, the insert having good recoverability when heated to a shape recovery temperature or higher. It is intended to provide a manufacturing method for obtaining an action pipe.
[0007]
[Means for solving problems]
In order to achieve the first object, the present inventors made a polyethylene pipe (here, the polyethylene pipe includes a polyethylene pipe having a crosslinking degree of 65% or more, the same applies to the following polyethylene pipe) as the outer layer portion. As a result of various experiments conducted to obtain a temperature that can be softened without melting, for example, a range of 100 to 125 ° C. is suitable for a medium density polyethylene tube and 100 to 130 ° C. for a crosslinked polyethylene tube. Part melting was observed.
[0008]
In the first invention, a polyethylene pipe is heated in two stages. That is, a preliminary heating stage in which the temperature is uniformly increased in the thickness direction to a temperature at which the outer layer portion of the polyethylene pipe is not melted, and a stage in which the temperature is increased to 100 to 130 ° C. (hereinafter referred to as the pseudo melting point) after the preliminary heating. It consists of
[0009]
That is, in the first invention, the polyethylene pipe is heated and heated to near the pseudo melting point where the tensile stress rapidly decreases as the temperature rises, and then the diameter is reduced, and then the shape recovery temperature is maintained while maintaining the reduced diameter. in insertion pipe manufacturing method of the cooling to the heating process of a polyethylene tube prior to diameter reduction process, the steps of preheating the polyethylene tube to 80 to 98 ° C., after preheating, a temperature of at least the surface by the heating means 100 The apparatus for carrying out this method is characterized by comprising a step of heating to ˜130 ° C., and an apparatus for preheating the polyethylene pipe to 80 to 98 ° C. reduced by crushing and second heating device for heating to a temperature of at least the surface of the polyethylene pipe reaches 100 to 130 ° C., the polyethylene tube was raised A device for processing, characterized by comprising the cooling device for cooling the reduced diameter polyethylene tube to below the shape recovering temperature.
[0010]
As a method for preheating the polyethylene tube to 80 to 98 ° C., it is desirable to immerse it in hot water or raise the temperature with steam. This is because the temperature can be easily raised without unevenness in the thickness direction, and when immersed in hot water, it is not heated above 100 ° C. Moreover, in the polyethylene pipe containing a crosslinking agent, crosslinking can be caused by this step.
[0011]
The present method and apparatus may use a polyethylene pipe cooled to room temperature, or may be applied to a polyethylene pipe on a line that has been extruded from an extrusion die and once cooled and solidified for shape memory. In this case, the cooling temperature is desirably 60 ° C. or less for the reason described later. When the cooling temperature exceeds 60 ° C., the recoverability when the diameter-reduced polyethylene pipe is heated and restored to a circular cross section is deteriorated.
[0012]
According to experiments conducted by the present inventors in order to achieve the second object, it was found that 80 to 100 ° C. is appropriate for crosslinking of the resin.
[0013]
Therefore, in the third invention for achieving the second object, the polyethylene pipe having a circular cross section extruded from the extrusion die is once cooled and solidified, and then re-approximated to near the pseudo melting point where the tensile stress rapidly decreases as the temperature rises. In the method for reducing the diameter of a crosslinked polyethylene pipe that is reduced in diameter after heating, the step of heating the polyethylene pipe for diameter reduction is a first step of raising the temperature of the polyethylene pipe to 80 to 100 ° C. with hot water or steam to cause crosslinking. And a second step of raising the temperature to near the pseudo-melting point where the tensile stress decreases rapidly as the temperature rises.
[0014]
According to the present invention, the polyethylene pipe after crosslinking in the above temperature range is not memorized even if the diameter is reduced after the temperature is further raised to the vicinity of the pseudo melting point. In addition to having good resilience, it is possible to prevent melting of the outer pipe layer as described above by heating the polyethylene pipe in two stages.
The present inventors have also found that when the cooling temperature of the polyethylene pipe extruded from the extrusion die exceeds 60 ° C., the recoverability deteriorates, and it is necessary to cool to 60 ° C. or less in order to improve the recoverability. It was.
[0015]
Accordingly, the fourth invention is a cross-linked polyethylene pipe which is once cooled and solidified after the polyethylene pipe having a circular cross section extruded from the extrusion die is cooled and then reheated to near the pseudo melting point where the tensile stress decreases rapidly as the temperature rises. In the diameter reduction processing method, the cooling temperature of the polyethylene pipe having a circular cross section extruded from the extrusion die is set to 60 ° C. or less.
[0016]
In each of the above inventions, the polyethylene tube is heated until it reaches the vicinity of the pseudo melting point prior to the diameter reduction processing, for example, using a hot air dryer. In this case, so as not to hit directly hot polyethylene pipes, for such polyethylene pipe is polyethylene tube is covered with a hood is as uniform as possible heating is desirable.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an insertion pipe manufacturing apparatus, in which an extrusion die 1, a cooling device 3 that cools once to store a shape of a polyethylene tube 2 having a circular cross section extruded from the extrusion die 1, and hot water is filled and cooled. the polyethylene pipe 2 which is cooled by the device 3 and the first heating device 4 for preheating consists of a heater and a fan (not shown in the figure), a second heating device for heating the polyethylene pipe 2 which is pre-heated in the heating device 4 A hot air dryer 5, a roller and the like, a diameter reducing device 6 for reducing the diameter of the heated polyethylene pipe 2, and a cooling device for cooling the diameter-reduced polyethylene pipe 2 and stabilizing the shape in the reduced diameter state. 7, consists diameter polyethylene tube 2 the winding wound-up device 8 Prefecture, local heating of hits hot air directly to a polyethylene tube during heating of the polyethylene pipe 2 by hot air The polyethylene pipe as evenly heated without Rukoto hood is covered.
[0018]
EXAMPLE Using the apparatus shown in FIG. 1, a polyethylene tube 2 containing a cross-linking agent extruded from an extrusion die 1 is cooled to 60 ° C. or less by a cooling device 3 and then to a first heating device 4 (hot water temperature 98 ° C.). After passing through for 3 minutes and raising the temperature to 80 to 98 ° C. and crosslinking, it was sent to the hot air dryer 5 and heated to 100 to 130 ° C. Thereafter, the polyethylene 2 having a circular cross section is crushed and reduced in diameter by the diameter reducing device 6 as shown in FIG. Winded up.
[0019]
【The invention's effect】
The present invention is configured as described above and has the following effects.
According to the manufacturing method and apparatus of claims 1 and 2 , since it is once heated to an intermediate temperature by preheating, then it is heated to near the pseudo melting point, and the temperature is raised in two stages. The amount of heating is small, and the outer layer of the polyethylene tube is less likely to melt compared to heating to the vicinity of the pseudo melting point at once.
[0020]
According to the manufacturing method of Claim 3 , an insertion pipe can be manufactured by 1 line, and productivity improves.
According to the manufacturing method of Claim 4, it becomes possible to perform shape memory completely with a pipe shape, and the restoring property when restoring the reduced diameter polyethylene pipe to a circular cross section is improved.
[0021]
According to the manufacturing method of claim 5 , the temperature can be easily raised without unevenness in the thickness direction.
According to the manufacturing method of claim 6 , by performing the crosslinking at 80 to 100 ° C., it is possible to manufacture an insertion pipe having good recoverability without losing shape memory before processing, and two-stage heating. By doing so, it is possible to prevent melting of the outer tube portion during heating.
[0022]
According to the manufacturing method of the seventh aspect , the insertion pipe can be manufactured in one line, and the resilience when the diameter-reduced polyethylene pipe is restored to a circular cross section is improved.
[0023]
When a hot air dryer is used to heat the polyethylene pipe as in the manufacturing method according to claim 8 , the polyethylene pipe can be heated relatively uniformly by covering the polyethylene pipe with a hood and blowing the hot air. it can.
[Brief description of the drawings]
FIG. 1 is a schematic view of a production apparatus according to the present invention.
FIG. 2 is a cross-sectional view of a pipe whose diameter has been reduced.
[Explanation of symbols]
1. Extrusion die 2. Plastic tube 3, 7. Cooling device 4. First heating device 5. Hot-air dryer 6. Diameter reduction device 8. Winding device

Claims (8)

ポリエチレン管を加熱し、温度上昇に伴って引張応力が急激に減少する100〜130℃まで昇温させたのち縮径加工し、ついで縮径形状を保ちながら形状回復温度以下まで冷却するインサーションパイプの製造方法において、縮径加工に先立つポリエチレン管の加熱工程を、ポリエチレン管を80〜98℃まで予備加熱する工程と、予備加熱後、加熱手段により少なくとも表面の温度が100〜130℃となるように加熱する工程より構成することを特徴とするインサーションパイプの製造方法。Insertion pipe that heats a polyethylene pipe, raises the temperature to 100-130 ° C. , where the tensile stress decreases sharply as the temperature rises, then reduces the diameter, and then cools to a temperature below the shape recovery temperature while maintaining the reduced diameter in the method of manufacturing, a heating step of a polyethylene tube prior to diameter reduction process, the steps of preheating the polyethylene tube to 80 to 98 ° C., so that after preheating, a temperature of at least the surface by the heating means is 100 to 130 ° C. A method for manufacturing an insertion pipe, characterized in that the method comprises a step of heating to the insertion pipe. ポリエチレン管を80〜98℃まで予備加熱する第1の加熱装置と、予備加熱後のポリエチレン管を少なくとも表面の温度が100〜130℃に達するまで加熱する第2の加熱装置と、昇温したポリエチレン管を押し潰して縮径加工する装置と、縮径したポリエチレン管を形状回復温度以下まで冷却する冷却装置からなることを特徴とする請求項記載のインサーションパイプの製造方法を実施する装置。 A first heating device for preheating the polyethylene tube to 80-98 ° C., a second heating device for heating the pre-heated polyethylene tube until at least the surface temperature reaches 100-130 ° C., and the temperature of the polyethylene a device for diameter reduction by crushing the tubes, reduced diameter polyethylene tube shape recovery temperature following to an apparatus for carrying out the production method of the insertion pipe according to claim 1, characterized in that the cooling device for cooling. ポリエチレン管の加熱は、押出しダイスから押出して形状記憶のため一旦冷却固化したのちのポリエチレン管に対して行われる請求項1記載のインサーションパイプの製造方法。 The method for producing an insertion pipe according to claim 1, wherein the heating of the polyethylene pipe is performed on the polyethylene pipe after being extruded from an extrusion die and once cooled and solidified for shape memory. 押出しダイスから押出したポリエチレン管は、60℃以下に冷却される請求項記載のインサーションパイプの製造方法。The method for producing an insertion pipe according to claim 3 , wherein the polyethylene pipe extruded from the extrusion die is cooled to 60 ° C. or lower. ポリエチレン管の予備加熱は湯又はスチームを用いて行われる請求項1、3又はのいづれかの請求項に記載のインサーションパイプの製造方法。 The method for manufacturing an insertion pipe according to any one of claims 1, 3 and 4 , wherein the preheating of the polyethylene pipe is performed using hot water or steam. 押出しダイスから押出した円形断面のポリエチレン管を一旦冷却固化し、ついで温度上昇に伴って引張り応力が急激に減少する100〜130℃まで再加熱したのち縮径する架橋ポリエチレン管の縮径加工方法において、縮径加工のためポリエチレン管を加熱する工程を湯又はスチームによりポリエチレン管を80〜100℃まで昇温させて架橋を起こさせる第1の加熱工程と、温度上昇に伴なって引張応力が急激に減少する100〜130℃まで昇温させる第2の加熱工程より構成することを特徴とするインサーションパイプの製造方法。In a method for reducing the diameter of a cross-linked polyethylene pipe, the polyethylene pipe having a circular cross section extruded from an extrusion die is once cooled and solidified, and then reheated to 100 to 130 ° C. where the tensile stress decreases rapidly as the temperature rises. a first heating step, the tensile stress an increase in temperature rapidly to the step of heating the polyethylene pipe for diameter reduction by a polyethylene tube was heated to 80 to 100 ° C. the hot water or steam to cause crosslinking A method for manufacturing an insertion pipe, characterized by comprising a second heating step in which the temperature is raised to 100 to 130 ° C. 押出しダイスから押出した円形断面のポリエチレン管を一旦冷却固化し、ついで温度上昇に伴って引張り応力が急激に減少する100〜130℃まで再加熱したのち縮径する架橋ポリエチレン管の縮径加工方法において、押出しダイスから押出した円形断面のポリエチレン管の冷却温度を60℃以下とする請求項記載のインサーションパイプの製造方法。In a method for reducing the diameter of a cross-linked polyethylene pipe, the polyethylene pipe having a circular cross section extruded from an extrusion die is once cooled and solidified, and then reheated to 100 to 130 ° C. where the tensile stress decreases rapidly as the temperature rises. The method for producing an insertion pipe according to claim 6, wherein the cooling temperature of the polyethylene pipe having a circular cross section extruded from the extrusion die is 60 ° C. or less. 縮径加工に先立って行われるポリエチレン管の加熱には、熱風型乾燥機が使用され、加熱時にはポリエチレン管に熱風が直接当たらないようにフードが被せられる請求項1、又はのいづれかの請求項に記載のインサーションパイプの製造方法。The heating of the polyethylene pipe which is performed prior to the diametral reduction, is used a hot-air dryer, the time of heating the claims either hot air the polyethylene tube of claim 1, 3 or 7 hood so as not exposed to direct is covered The method for manufacturing the insertion pipe according to item.
JP10886997A 1997-04-25 1997-04-25 Method and apparatus for manufacturing insertion pipe Expired - Fee Related JP3908328B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10886997A JP3908328B2 (en) 1997-04-25 1997-04-25 Method and apparatus for manufacturing insertion pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10886997A JP3908328B2 (en) 1997-04-25 1997-04-25 Method and apparatus for manufacturing insertion pipe

Publications (2)

Publication Number Publication Date
JPH10296857A JPH10296857A (en) 1998-11-10
JP3908328B2 true JP3908328B2 (en) 2007-04-25

Family

ID=14495659

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10886997A Expired - Fee Related JP3908328B2 (en) 1997-04-25 1997-04-25 Method and apparatus for manufacturing insertion pipe

Country Status (1)

Country Link
JP (1) JP3908328B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4590212B2 (en) * 2004-06-02 2010-12-01 未来工業株式会社 Manufacturing method of long water pipe made of synthetic resin
JP4581774B2 (en) * 2005-03-23 2010-11-17 住友金属工業株式会社 Manufacturing equipment for internally coated steel pipes

Also Published As

Publication number Publication date
JPH10296857A (en) 1998-11-10

Similar Documents

Publication Publication Date Title
US3972548A (en) Method of joining components made of cross-linked polymers
US4366107A (en) Making shrink-fit objects
JP3908328B2 (en) Method and apparatus for manufacturing insertion pipe
CN112356443B (en) Bicycle aluminum ring processing technology
JP2798889B2 (en) Manufacturing method of rolled long resin tube
JP2000506455A (en) Method for molding sockets in biaxially stretched polyvinyl chloride tubes
JPH10166468A (en) Manufacture of thermoplastic resin pipe and device therefor
JPH07115410B2 (en) Inner surface lining method using polyolefin resin tube
JP4487591B2 (en) Resin pipe having shape memory characteristics and inner surface resin-lined steel pipe using the resin pipe
JP3494860B2 (en) Pipe line lining method
JP3594484B2 (en) Manufacturing method of insertion pipe
GB2272039A (en) Lining of elongate hollow member
KR950031452A (en) Plastic pipe manufacturing method and apparatus and plastic pipe
JPH0970887A (en) Production of lining pipe
JPH0557814A (en) Manufacture of resin and rubber composite bent hose
JP3913492B2 (en) Method for producing synthetic resin-coated metal tube
JPH0777291A (en) Pipe insertion method and resin pipe
JP2003117987A (en) Method for manufacturing lining material for ductwork of polyvinyl chloride
JP3315762B2 (en) Resin tube insertion jig and resin tube insertion method
JP3585370B2 (en) Polyolefin pipe bending method
JP2000100265A (en) Manufacture of rubber-covered wire, and manufacturing device thereof
JP4404732B2 (en) Synthetic resin liner material for pipes
JP2002257264A (en) Manufacturing method of multilayer resin pipe, and manufacturing method of inner surface resin lining steel pipe
JP2003112358A (en) Method for manufacturing vinyl chloride resin liner material for pipe line
KR19980073852A (en) Manufacturing method of heat shrinkable embossed tube

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20040325

A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A711

Effective date: 20040721

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A821

Effective date: 20040721

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20041007

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20050901

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20050913

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20051108

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20070116

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20070118

R150 Certificate of patent (=grant) or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313117

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100126

Year of fee payment: 3

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110126

Year of fee payment: 4

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110126

Year of fee payment: 4

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120126

Year of fee payment: 5

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120126

Year of fee payment: 5

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130126

Year of fee payment: 6

LAPS Cancellation because of no payment of annual fees