JPS636342B2 - - Google Patents
Info
- Publication number
- JPS636342B2 JPS636342B2 JP58043839A JP4383983A JPS636342B2 JP S636342 B2 JPS636342 B2 JP S636342B2 JP 58043839 A JP58043839 A JP 58043839A JP 4383983 A JP4383983 A JP 4383983A JP S636342 B2 JPS636342 B2 JP S636342B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- lead
- sealing material
- extruder
- machine
- 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
- 239000004033 plastic Substances 0.000 claims description 31
- 239000003566 sealing material Substances 0.000 claims description 28
- 238000004513 sizing Methods 0.000 claims description 17
- 210000002445 nipple Anatomy 0.000 claims description 14
- 238000001125 extrusion Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 208000028752 abnormal posture Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012840 feeding operation Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000003825 pressing Methods 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9115—Cooling of hollow articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は押出機によりパイプ状に押し出し、パ
イプ内圧を保ちながらサイジングダイにより仕上
成形するプラスチツクパイプ押出成形方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plastic pipe extrusion molding method in which the plastic pipe is extruded into a pipe shape using an extruder and finished molded using a sizing die while maintaining the pipe internal pressure.
一般にプラスチツクパイプの押出成形には、第
１図に示すようにクロスヘツド１を有する押出機
２、サイジングダイ３、冷却水槽４及び引取機５
等が使用されている。またプラスチツクパイプＭ
を引取機５の前方で連続的に定尺切断する場合に
は、エア通路８からパイプＭ内にエアを注入し、
パイプ内圧をシール材７により維持している。と
ころが従来のシール材７はサイジングダイ３近傍
のプラスチツクパイプＭ内に位置しているので、
シール材７が接触するパイプＭ部分は未冷却であ
り、温度が高く（190℃〜200℃）、シール材７が
パイプＭに粘着する可能性が多い。粘着の可能性
を回避するために、シール材７の外周面とパイプ
Ｍの内周面間にクリアランスを設けているが、シ
ール性能が大幅に低下するという不具合が生じ
る。また上記クリアランスがあるために、作業中
にシール材７が半径方向にぶれてしまい、それに
よりプラスチツクパイプＭ内のエアリーク量が変
動し、プラスチツクパイプＭの内圧を一定に保つ
ことができなくなり、プラスチツクパイプＭの仕
上精度に悪い影響を及ぼす。 In general, for extrusion molding of plastic pipes, as shown in FIG.
etc. are used. Also plastic pipe M
When continuously cutting to a specified length in front of the pulling machine 5, air is injected into the pipe M from the air passage 8,
The internal pressure of the pipe is maintained by a sealing material 7. However, since the conventional sealing material 7 is located inside the plastic pipe M near the sizing die 3,
The portion of the pipe M that the sealing material 7 contacts is uncooled and has a high temperature (190° C. to 200° C.), and there is a high possibility that the sealing material 7 will stick to the pipe M. In order to avoid the possibility of adhesion, a clearance is provided between the outer peripheral surface of the sealing material 7 and the inner peripheral surface of the pipe M, but a problem arises in that the sealing performance is significantly reduced. Furthermore, due to the above-mentioned clearance, the sealing material 7 deviates in the radial direction during work, which causes the amount of air leakage inside the plastic pipe M to fluctuate, making it impossible to keep the internal pressure of the plastic pipe M constant, and causing the plastic This adversely affects the finishing accuracy of the pipe M.
また口出作業方法としては、第１図の仮想線で
示すように口出部M′を袋状に閉じておくと共に、
口出部M′内にシール材７を挿入しておき、シー
ル材７と共に口出部M′を前方へ送り出し、ニツ
プル６のエア通路８からエアを注入する方法があ
る。ところが上記の口出作業方法では、半溶融状
口出部M′と共にシール材７がサイジングダイ３
内を通過するので、シール材７が異常な状態（姿
勢）でプラスチツクパイプＭ（口出部M′）に接触
する場合が多く、パイプ切れ事故の原因になる。 In addition, as a method for working the outlet, the outlet part M' is closed in a bag shape as shown by the imaginary line in Fig. 1, and
There is a method of inserting the sealing material 7 into the outlet M', sending the outlet M' forward together with the sealing material 7, and injecting air from the air passage 8 of the nipple 6. However, in the above-mentioned exit work method, the sealing material 7 is attached to the sizing die 3 along with the semi-molten exit portion M'.
Since the sealing material 7 often comes into contact with the plastic pipe M (outlet M') in an abnormal state (orientation), this may cause a pipe breakage accident.
また上記の口出作業方法では、口出部M′が引
取機５部分に至るまではパイプＭの仕上外径が安
定しないので、いわゆる押出ロス部分が長くな
り、不経済である。 In addition, in the above-mentioned outlet operation method, the finished outer diameter of the pipe M is not stabilized until the outlet part M' reaches the part of the take-off machine 5, so that the so-called extrusion loss portion becomes long, which is uneconomical.
第２図はプラスチツクパイプと同一断面形状の
プラスチツクダミーパイプ９を利用して、口出作
業を行う方法を示している。しかしこの方法では
ダミーパイプ９とクロスヘツド１内の溶融樹脂
「ｍ」の結合作業が極めて困難である。またダミ
ーパイプ９と樹脂「ｍ」との結合部分がサイジン
グダイ３へ至るまでに外方へ膨らんでしまい、ダ
ミーパイプ９をサイジングダイ３から円滑に引き
取ることが困難になる。 FIG. 2 shows a method of performing the extraction work using a plastic dummy pipe 9 having the same cross-sectional shape as the plastic pipe. However, with this method, it is extremely difficult to connect the dummy pipe 9 and the molten resin "m" in the crosshead 1. Furthermore, the joint portion between the dummy pipe 9 and the resin "m" bulges outward before reaching the sizing die 3, making it difficult to smoothly pull the dummy pipe 9 from the sizing die 3.
本発明は上記従来方法の不具合を解消すること
を目的としており、その要旨は、口出作業前に、
押出機とサイジングダイの間から引取機まで至る
リードパイプであつて、ニツプル外径より小さい
外径のものを配置しておき、引取機近傍でリード
パイプ内をシールして口出作業を行うようにした
プラスチツクパイプ押出成形方法である。以下図
面に関連して本発明を説明する。 The purpose of the present invention is to solve the problems of the conventional method described above, and its gist is to:
A lead pipe from between the extruder and the sizing die to the take-off machine is placed with an outer diameter smaller than the nipple outside diameter, and the inside of the lead pipe is sealed near the take-off machine to perform the exit work. This is a plastic pipe extrusion molding method. The invention will now be explained in conjunction with the drawings.
第３図において、クロスヘツド１から前方へと
順に、第１図の場合と同様にサイジングダイ３、
冷却水槽４及び引取機５が配置されている。 In FIG. 3, from the crosshead 1 forward, the sizing die 3,
A cooling water tank 4 and a take-up machine 5 are arranged.
口出作業前には、クロスヘツド１とサイジング
ダイ３の間の部分から引取機５までにわたつてリ
ードパイプ１１を配置しておく。リードパイプ１
１の中には拡張自在なシール材１２を圧縮状態で
挿入しておく。リードパイプ１１は例えば薄肉の
金属管であつて、その外径D1はニツプル６の外
径D2（30〜150mm）よりも少し（５〜10mm）小さ
い。またリードパイプ１１の後端部１１ａはラツ
パ状に少し拡径している。シール材１２はゴム、
プラスチツク又はナイロン等により、独立発泡部
を有するスポンジ状に形成されており、自由状態
でプラスチツクパイプＭ（第５図）の内径D3より
少し大きい直径まで拡張する。またシール材１２
にはリードワイヤ１６が固着されており、リード
ワイヤ１６の後端部はニツプル６の前端に着脱自
在に連結される。リードワイヤ１６の長さは、シ
ール材１２を引取機５の後方側近傍位置（第３図
の位置）につなぎ止めておける長さである。なお
口出作業前にはリードワイヤ１６の後端部をニツ
プル６の前端から外しておく。 Before the lead-out operation, a lead pipe 11 is arranged from the part between the crosshead 1 and the sizing die 3 to the take-off machine 5. lead pipe 1
A freely expandable sealing material 12 is inserted into the container 1 in a compressed state. The lead pipe 11 is, for example, a thin metal tube, and its outer diameter D 1 is slightly (5 to 10 mm) smaller than the outer diameter D 2 (30 to 150 mm) of the nipple 6. Further, the rear end portion 11a of the lead pipe 11 is slightly enlarged in diameter in a tulle shape. The sealing material 12 is rubber,
It is made of plastic or nylon, etc., and is formed into a sponge-like shape with closed foam parts, and expands to a diameter slightly larger than the inner diameter D3 of the plastic pipe M (Fig. 5) in a free state. Also, the sealing material 12
A lead wire 16 is fixed to the nipple 6, and the rear end of the lead wire 16 is detachably connected to the front end of the nipple 6. The length of the lead wire 16 is such that the sealing material 12 can be tied to a position near the rear side of the take-up machine 5 (the position shown in FIG. 3). Note that the rear end of the lead wire 16 is removed from the front end of the nipple 6 before the lead-out operation.
口出作業を行う前にまず偏肉調整を行う。即ち
第３図において、リードワイヤ１６をニツプル６
から外した状態で押出機２を少しずつ作動させ、
クロスヘツド１から出てくる半溶融状パイプＭを
ナイフ等で切断し、パイプＭの偏肉を調べ、ニツ
プル６の半径方向の位置を調節する。 Before starting the cutting work, first adjust the uneven thickness. That is, in FIG. 3, the lead wire 16 is connected to the nipple 6.
Operate extruder 2 little by little while removing it from the
The semi-molten pipe M coming out of the crosshead 1 is cut with a knife or the like, the uneven thickness of the pipe M is checked, and the position of the nipple 6 in the radial direction is adjusted.
次に口出作業方法について説明する。押出機２
を停止した状態でリードワイヤ１６の後端をニツ
プル６に連結する。しかる後に押出機２を少しの
間作動させ、第４図に示すようにリードパイプ後
端部１１ａまでパイプＭを押し出した後に、半溶
融状のパイプ口出部M′をリードパイプ１１のラ
ツパ状後端部１１ａの外側に被せ、口出部M′を
適宜の押付工具によりリードパイプ１１の外周面
に圧着する。この場合リードパイプ１１の外周面
と口出部M′の間の隙間をテーピングによりシー
ルしてもよい。 Next, we will explain how to perform the memorandum work. Extruder 2
With the lead wire 16 stopped, the rear end of the lead wire 16 is connected to the nipple 6. Thereafter, the extruder 2 is operated for a short time to extrude the pipe M to the rear end 11a of the lead pipe as shown in FIG. It is placed over the outside of the rear end portion 11a, and the outlet portion M' is pressed onto the outer peripheral surface of the lead pipe 11 using an appropriate pressing tool. In this case, the gap between the outer peripheral surface of the lead pipe 11 and the outlet portion M' may be sealed by taping.
次にニツプル６のエア通路８からプラスチツク
パイプＭ内及びリードパイプ１１内にエアを注入
して内圧をかけ、押出機２及び引取機５を作動さ
せ、口出部M′をリードパイプ１１と共に前方へ
引き取る。 Next, air is injected into the plastic pipe M and the lead pipe 11 from the air passage 8 of the nipple 6 to apply internal pressure, the extruder 2 and the take-up machine 5 are operated, and the outlet part M' is moved forward along with the lead pipe 11. Take it to.
口出部M′がサイジングダイ３及び冷却水槽４
を通過してシール材１２部分までくると、第５図
に示すようにシール材１２はプラスチツクパイプ
Ｍ内で拡張し、プラスチツクパイプＭ内をシール
する。 Outlet part M' is the sizing die 3 and cooling water tank 4
When the plastic pipe M reaches the sealing material 12, the sealing material 12 expands inside the plastic pipe M and seals the inside of the plastic pipe M, as shown in FIG.
リードパイプ１１が引取機５から抜き出た状態
になれば、口出部M′をカツター２０により切断
する。 When the lead pipe 11 is pulled out from the take-off machine 5, the outlet portion M' is cut by the cutter 20.
そして次に連続長尺切断による本来のパイプ製
造作業に移る。即ちクロスヘツド１から順次押し
出される半溶融状プラスチツクパイプＭはサイジ
ングダイ３により外径を正確に仕上げられ、冷却
水槽４により冷却され、引取機５で引き取られ
る。勿論連続定尺切断を行つている場合にも、エ
ア通路８からパイプＭ内へは常にエアが注入さ
れ、一定のパイプ内圧が保たれており、この内圧
でプラスチツクパイプＭをサイジングダイ３の内
周面に押し付け、パイプＭの外径を正確に仕上げ
るのである。 Next, we move on to the actual pipe manufacturing work, which involves continuous long-length cutting. That is, the semi-molten plastic pipe M sequentially extruded from the crosshead 1 is finished with an accurate outer diameter by a sizing die 3, cooled by a cooling water tank 4, and taken by a take-up machine 5. Of course, even when cutting to a continuous length, air is always injected into the pipe M from the air passage 8 to maintain a constant pipe internal pressure, and this internal pressure cuts the plastic pipe M into the sizing die 3. It is pressed against the circumferential surface to accurately finish the outer diameter of the pipe M.
以上説明したように本発明は、口出作業前、押
出機２のニツプル外径D2よりも小さい外径D1の
リードパイプ１１をサイジングダイ３と押出機２
の間の部分から引取機５までにわたつて配置する
と共に、引取機５の近傍所定位置にシール材１２
を配置し、このシール材１２をプラスチツクパイ
プ送り方向（前方向）移動不能にリードパイプ１
１内に圧縮挿入しておき、押出機２により押し出
される半溶融状プラスチツクパイプ口出部M′を
リードパイプ１１の端部に被覆接続し、リードパ
イプ１１を引き取ることにより口出作業を行うよ
うにしたプラスチツクパイプ押出成形方法である
ので、次のような利点がある。 As explained above, in the present invention, the lead pipe 11 having an outer diameter D 1 smaller than the nipple outer diameter D 2 of the extruder 2 is connected to the sizing die 3 and the extruder 2 before the feeding operation.
A sealing material 12 is disposed from the part between the parts to the collecting machine 5, and a sealing material 12 is placed at a predetermined position near the collecting machine 5.
This sealing material 12 is placed on the lead pipe 1 so that it cannot move in the plastic pipe feeding direction (forward direction).
The semi-molten plastic pipe exit part M', which is compressed and inserted into the lead pipe 1 and extruded by the extruder 2, is covered and connected to the end of the lead pipe 11, and the lead pipe 11 is taken out to perform the exit work. This plastic pipe extrusion molding method has the following advantages:
(1) 引取機５の近くでプラスチツクパイプＭ内を
シールするので、第１、第２図の従来例に比べ
てパイプ温度が低い部分をシールすることにな
り、シール材１２の外周面がプラスチツクパイ
プＭの内周面に確実に気密状態で当接し、シー
ル性能が極めて良くなる。またそれによりプラ
スチツクパイプＭの真円度及び外観等も良くな
る。(1) Since the inside of the plastic pipe M is sealed near the pulling machine 5, the part where the pipe temperature is lower than in the conventional example shown in FIGS. 1 and 2 is sealed, and the outer peripheral surface of the sealing material 12 is It reliably contacts the inner circumferential surface of the pipe M in an airtight state, and the sealing performance is extremely improved. This also improves the roundness and appearance of the plastic pipe M.
(2) リードパイプ１１の後端を押出機２とサイジ
ングダイ３の間に位置させるので、口出後、す
ぐに連続押出成形作業を行うことができ、押出
ロス、即ち口出部M′等の無駄な部分を大幅に
短くでき、経済的である。(2) Since the rear end of the lead pipe 11 is located between the extruder 2 and the sizing die 3, continuous extrusion molding work can be performed immediately after exiting, thereby reducing extrusion loss, ie, exit section M', etc. It is economical because the unnecessary parts can be significantly shortened.
(3) リードパイプ１１の外径D1をニツプル外径
D2よりも小さくするので、口出部M′をリード
パイプ１１に接続する作業が極めて容易にな
り、また口出作業においてリードパイプ１１を
サイジングダイ３から円滑に抜き出すことがで
きる。即ち口出作業を簡単かつ迅速に行える。(3) The outer diameter D1 of the lead pipe 11 is the outer diameter of the nipple.
Since it is made smaller than D 2 , it becomes extremely easy to connect the outlet portion M' to the lead pipe 11, and the lead pipe 11 can be smoothly extracted from the sizing die 3 during the outlet operation. In other words, the output work can be performed easily and quickly.
(4) またシール材１２を予めリードパイプ１１内
の所定位置に配置しておくので、口出作業時に
シール材１２が異常な姿勢に変形することはな
く、口出作業時におけるパイプ切れ事故の心配
はない。(4) Furthermore, since the sealing material 12 is placed in a predetermined position inside the lead pipe 11 in advance, the sealing material 12 will not be deformed into an abnormal posture during the lead pipe work, and this will prevent pipe breakage accidents during the lead pipe work. No worries.
なお本発明においては、第６図に示すように
引取機５の前方側でシール材１２によりシール
してもよい。この場合には引取機５でのパイプ
Ｍのつぶれ現象を防止できる。 In addition, in the present invention, as shown in FIG. 6, the front side of the take-up machine 5 may be sealed with a sealing material 12. In this case, it is possible to prevent the pipe M from collapsing in the take-up machine 5.
またシール材１２としては、第６図に示すよ
うに後側が開口する袋状ゴム体を用いることも
できる。第６図のシール材１２はリードパイプ
１１（又はプラスチツクパイプＭ）内の内圧に
より拡張する。 Further, as the sealing material 12, a bag-shaped rubber body whose rear side is open as shown in FIG. 6 can also be used. The sealing material 12 shown in FIG. 6 expands due to the internal pressure within the lead pipe 11 (or plastic pipe M).
またリードパイプ１１としてはプラスチツク
製のものを使用することもできる。 Furthermore, the lead pipe 11 can also be made of plastic.
第１、第２図はそれぞれ従来方法を示すための
押出成形装置の縦断側面図、第３〜第５図は本発
明の押出成形方法を示すための押出成形装置の縦
断側面図、第６図は別の具体化例を示す断面部分
図である。２……押出機、３……サイジングダ
イ、５……引取機、６……ニツプル、１１……リ
ードパイプ、１２……シール材。
1 and 2 are longitudinal cross-sectional side views of an extrusion molding apparatus to illustrate the conventional method, respectively. FIGS. 3 to 5 are longitudinal cross-sectional side views of the extrusion molding apparatus to illustrate the extrusion molding method of the present invention, and FIG. FIG. 2 is a partial cross-sectional view showing another embodiment. 2...Extruder, 3...Sizing die, 5...Take-off machine, 6...Nipple, 11...Lead pipe, 12...Sealing material.
Claims (1)
圧を保ちながらサイジングダイにより仕上成形
し、引取機により引き取るプラスチツクパイプ押
出成形方法において、口出作業前、押出機のニツ
プル外径よりも小さい外径のリードパイプをサイ
ジングダイと押出機の間の部分から引取機までに
わたつて配置すると共に、リードパイプ内の引取
機近傍の所定位置にシール材を配置し、このシー
ル材をプラスチツクパイプ送り方向移動不能にリ
ードパイプ内に圧縮挿入しておき、押出機により
押し出される半溶融状プラスチツクパイプ口出部
をリードパイプ端部に被覆接続し、リードパイプ
を引き取ることにより口出作業を行うようにした
ことを特徴とするプラスチツクパイプ押出成形方
法。1 In the plastic pipe extrusion molding method, in which the pipe is extruded into a pipe shape by an extruder, finished formed by a sizing die while maintaining the pipe internal pressure, and then taken by a take-off machine, a lead with an outer diameter smaller than the nipple outer diameter of the extruder is used before the ejection operation. The pipe is arranged from the part between the sizing die and the extruder to the take-off machine, and a sealing material is placed at a predetermined position in the lead pipe near the take-off machine, and this sealing material is made immovable in the plastic pipe feeding direction. A semi-molten plastic pipe that is compressed and inserted into the lead pipe and extruded by an extruder is covered and connected to the end of the lead pipe, and the lead pipe is pulled out to perform the exit work. Plastic pipe extrusion molding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58043839A JPS59169822A (en) | 1983-03-15 | 1983-03-15 | Extrusion molding method of plastic pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58043839A JPS59169822A (en) | 1983-03-15 | 1983-03-15 | Extrusion molding method of plastic pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59169822A JPS59169822A (en) | 1984-09-25 |
| JPS636342B2 true JPS636342B2 (en) | 1988-02-09 |
Family
ID=12674911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58043839A Granted JPS59169822A (en) | 1983-03-15 | 1983-03-15 | Extrusion molding method of plastic pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59169822A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH089192B2 (en) * | 1990-09-18 | 1996-01-31 | 筒中プラスチック工業株式会社 | Manufacturing method of resin pipe for existing pipe lining |
-
1983
- 1983-03-15 JP JP58043839A patent/JPS59169822A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59169822A (en) | 1984-09-25 |
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