JPH0677957B2 - Plastic pipe manufacturing method - Google Patents
Plastic pipe manufacturing methodInfo
- Publication number
- JPH0677957B2 JPH0677957B2 JP60208000A JP20800085A JPH0677957B2 JP H0677957 B2 JPH0677957 B2 JP H0677957B2 JP 60208000 A JP60208000 A JP 60208000A JP 20800085 A JP20800085 A JP 20800085A JP H0677957 B2 JPH0677957 B2 JP H0677957B2
- Authority
- JP
- Japan
- Prior art keywords
- die
- silicone oil
- sizing device
- pipe
- plastic pipe
- 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 - Lifetime
Links
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
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
-
- 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
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
-
- 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
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
- B29C48/903—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies externally
-
- 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
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/904—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article using dry calibration, i.e. no quenching tank, e.g. with water spray for cooling or lubrication
-
- 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
- B29C48/885—External treatment, e.g. by using air rings for cooling tubular films
-
- 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
- B29C48/912—Cooling of hollow articles of tubular films
-
- 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
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
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】 〔産業上の利用分野〕 この発明は、地中送電線路のトラフ内間接冷却用水冷管
として使用するようなプラスチックパイプの製造方法に
関する。TECHNICAL FIELD The present invention relates to a method for manufacturing a plastic pipe used as a water cooling pipe for indirect cooling in a trough of an underground power transmission line.
地中送電線路の大容量化に伴い、トラフ内間接冷却用の
水冷管としてプラスチック管が実用化されている。この
プラスチック管としてはポリエチレンパイプがその性能
上から適用されている。このポリエチレンパイプの製造
には、品質面、経済性、作業性等の面から、外部サイジ
ング方式が適用されている。With the increase in the capacity of underground power transmission lines, plastic pipes have been put to practical use as water cooling pipes for indirect cooling in troughs. As this plastic pipe, a polyethylene pipe is applied due to its performance. An external sizing method is applied to the production of this polyethylene pipe in terms of quality, economy, workability, and the like.
ポリエチレン押出機のクロスヘッド部分を第２図に示
す。ダイ口金３の内側にはニップル２が配置されてい
て、このニップル２の中心には空気供給用の孔１が設け
られている。そして、ダイ口金３の直後にはサイジング
装置７が芯合わせされて配置されている。このサイジン
グ装置７は内径が製造されるパイプと略同径に形成さ
れ、その周囲は中空の冷却水室６から構成されていて、
下部には冷却水用の入口５、上部には冷却水の排水用出
口４が設けられ、それぞれ図示しない冷却水の吸水管及
び排水管が接続される。The crosshead portion of the polyethylene extruder is shown in FIG. A nipple 2 is arranged inside the die base 3, and a hole 1 for air supply is provided at the center of the nipple 2. Immediately after the die base 3, a sizing device 7 is arranged in alignment. The sizing device 7 is formed to have an inner diameter substantially the same as that of the pipe to be manufactured, and the circumference thereof is composed of a hollow cooling water chamber 6.
An inlet 5 for cooling water is provided in the lower part, and an outlet 4 for draining the cooling water is provided in the upper part, to which a water absorption pipe and a drain pipe of the cooling water (not shown) are respectively connected.
このように構成された装置でポリエチレンパイプ８を製
造するには、押出機のダイ口金３とニップル２の間から
管状に押出されたポリエチレン樹脂が、次のサイジング
装置７に送られ、ニップル２の孔１から矢印のように供
給される圧力空気により外径調整を受けながら冷却され
て、連続的にポリエチレンパイプ８を成形するようにな
っている。In order to manufacture the polyethylene pipe 8 with the apparatus configured as described above, the polyethylene resin extruded in a tubular shape from between the die base 3 and the nipple 2 of the extruder is sent to the next sizing apparatus 7 and the nipple 2 The polyethylene pipe 8 is continuously molded by being cooled while being adjusted in outer diameter by pressure air supplied from the hole 1 as indicated by an arrow.
ところが、サイジング装置７が押出機ヘッドのダイ口金
３に直接に接触していると、ダイ口金３が冷やされてポ
リエチレン樹脂の押出成形に支障を来たしてまう。この
ため、一般にはダイ口金３とサイジング装置７との間
に、0.5〜1.5mmの僅かな間隙を設けて成形している。However, if the sizing device 7 is in direct contact with the die die 3 of the extruder head, the die die 3 is cooled and the extrusion molding of the polyethylene resin is hindered. Therefore, in general, a small gap of 0.5 to 1.5 mm is provided between the die die 3 and the sizing device 7 for molding.
しかし、この方式では、一旦ダイ口金３より押出された
ポリエチレン樹脂が外気に触れてサイジング装置７内に
入るようになっているため、上記間隙よりポリエチレン
パイプ８の表面に空気を抱き込んで進入するため、サイ
ジング装置７内で冷却成形された後のポリエチレンパイ
プの表面に「えくぼ」状または「あばた」状の凹みを生
ずる欠点があった。However, in this method, the polyethylene resin once extruded from the die cap 3 comes into contact with the outside air to enter the sizing device 7, so that air is entrapped and enters the surface of the polyethylene pipe 8 through the gap. Therefore, there is a drawback that "dimple" -shaped or "pitted" -shaped depressions are formed on the surface of the polyethylene pipe that has been cold-molded in the sizing device 7.
この発明は、前述の問題点に鑑みてなされたもので、プ
ラスチックパイプの押出成形の際におけるパイプ表面の
平滑性、均一性を向上させ、パイプの内圧強度及び製品
の信頼性を向上させることができる新規なプラスチック
パイプの製造方法を提供することに目的がある。The present invention has been made in view of the above problems, and it is possible to improve the smoothness and uniformity of the pipe surface during extrusion molding of a plastic pipe, and to improve the internal pressure strength of the pipe and the reliability of the product. It is an object to provide a novel method of manufacturing a plastic pipe that can be manufactured.
この発明により提供するプラスチックパイプの製造方法
は、押出機のダイ口金とサイジング装置との間に設定さ
れた微小間隙（0.5〜1.5mm）に、馬蹄形状のパッキンを
介在してそのパッキン内へ粘度:200〜500c.s/25℃、引
火点:300℃、表面張力:21.0〜21.5dyne/cmからなるシリ
コーンオイルを、常温かつ大気圧で１〜2cc/minの塗布
量で供給してダイ口金とサイジング装置との間を当該シ
リコーンオイルで気密にシールし、押し出されるプラス
チックパイプをダイ口金の直後から当該シリコーンオイ
ルで全周面シールしつつ該シリコーンオイルを付着させ
ながらサイジング装置内へ進入させてサイジングするこ
とにより、ダイ口金とサイジング装置間に温度効果に影
響を与えることなしに、而も適度な粘度を有する耐熱性
のシリコーンオイルでポリエチレンパイプの全表面をシ
ールすることになり、外気を遮断してサイジング装置内
に進入させて製造することにより、外観が平滑で均一な
プラスチックパイプを製造できるものとした。The method for manufacturing a plastic pipe provided by the present invention is such that a horseshoe-shaped packing is interposed in a minute gap (0.5 to 1.5 mm) set between the die die of the extruder and the sizing device, and a viscosity is introduced into the packing. : 200-500c.s / 25 ℃, flash point: 300 ℃, surface tension: 21.0-21.5dyne / cm Silicone oil is supplied at a coating amount of 1-2cc / min at room temperature and atmospheric pressure, and the die die And the sizing device are air-tightly sealed with the silicone oil, and the extruded plastic pipe is completely sealed with the silicone oil immediately after the die cap while adhering the silicone oil to the sizing device. By sizing, heat-resistant silicone oil with an appropriate viscosity can be used for polyethylene padding without affecting the temperature effect between the die die and the sizing device. Will be to seal the entire surface of the flop, by prepared by blocking the outside air is advanced into the sizing device, the appearance was assumed to be produced a smooth, uniform plastic pipes.
〔実施例」 この発明のプラスチックパイプの製造方法に使用するた
めの装置を第１図に基づいて説明する。前述した第２図
の従来例において説明した装置と同一部材は同一符号を
付し、その説明を省略する。[Example] An apparatus for use in the method for producing a plastic pipe of the present invention will be described with reference to FIG. The same members as those of the device described in the conventional example of FIG. 2 described above are denoted by the same reference numerals, and the description thereof will be omitted.
押出機のクロスヘッドにはダイ口金３、ニップル２が設
けられ、これに芯合わせされてサイジング装置７が配置
されている。ダイ口金３とサイジング装置装置７との間
の微小間隙（0.5〜1.5mm）にはテフロン（商品名）製の
パッキン９を馬蹄形に取り付け、このパッキン９の上部
にはシール用液体供給タンク11が配置され、このタンク
11の底から供給管12が上記パッキン９開口部に連絡され
ている。そして、上記パッキン９とダイ口金３とサイジ
ング装置７との微小間隙に供給するシール用液体として
シリコーンオイル10を使用する。このシリコーンオイル
の物理特性を次表に示す。A die base 3 and a nipple 2 are provided on the crosshead of the extruder, and a sizing device 7 is arranged in alignment with the die. A Teflon (trade name) packing 9 is attached in a horseshoe shape in a minute gap (0.5 to 1.5 mm) between the die base 3 and the sizing device 7, and a sealing liquid supply tank 11 is provided above the packing 9. Placed this tank
A supply pipe 12 is connected to the opening of the packing 9 from the bottom of 11. Then, silicone oil 10 is used as a sealing liquid to be supplied to the minute gap among the packing 9, the die base 3 and the sizing device 7. The physical properties of this silicone oil are shown in the following table.
次に、上記の装置を用いてポリエチレンパイプの製造方
法について説明する。 Next, a method for manufacturing a polyethylene pipe using the above apparatus will be described.
押出機のニップル２及びダイ口金３を、成形するポリエ
チレンパイプ８の外径、厚さ及び内径に合わせてセット
する。また、サイジング装置７の内径も製造されるポリ
エチレンパイプの外径と同じ径を有している。そして、
このサイジング装置７を別個にセンターを合わせてダイ
口金３と微小間隙を離して設置しその際微小間隙にテフ
ロン（商品名）製のパッキン９を介在する。また、シリ
コーンオイルのタンク11をテフロン（商品名）製のパッ
キン９の上部にセットして準備を完了する。The nipple 2 and die die 3 of the extruder are set according to the outer diameter, thickness and inner diameter of the polyethylene pipe 8 to be molded. Also, the inner diameter of the sizing device 7 has the same diameter as the outer diameter of the polyethylene pipe to be manufactured. And
This sizing device 7 is separately installed by aligning the centers with a minute gap from the die die 3 and at that time, a packing 9 made of Teflon (trade name) is interposed in the minute gap. Further, the silicone oil tank 11 is set on the packing 9 made of Teflon (trade name), and the preparation is completed.
押出機本体を稼動させてポリエチレンパイプ８がサイジ
ング装置７を出たところで、このポリエチレンパイプ８
の端部を盲にする。そして、サイジング装置７の冷却水
室６に冷却水入口５から冷却水を送水して満たし冷却水
出口４より排水を行う。このときサイジング条件とし
て、冷却水の温度が20℃以下、サイジング装置７の長さ
はポリエチレンパイプの外径の1.0倍〜1.5倍、ポリエチ
レンパイプの内圧が0.2〜0.5kg/cm2が適当である。When the polyethylene pipe 8 exits the sizing device 7 by operating the extruder main body, the polyethylene pipe 8
Make the end of the blind. Then, the cooling water is supplied from the cooling water inlet 5 to the cooling water chamber 6 of the sizing device 7 to be filled, and the cooling water is discharged from the cooling water outlet 4. At this time, as sizing conditions, it is suitable that the temperature of the cooling water is 20 ° C. or less, the length of the sizing device 7 is 1.0 to 1.5 times the outer diameter of the polyethylene pipe, and the inner pressure of the polyethylene pipe is 0.2 to 0.5 kg / cm 2. .
次に、シリコンーンオイルのタンク11より供給管12によ
りシリコーンオイル10を適量給油する。そして、圧力空
気をニップル２の孔１を通して送り、徐々にポリエチレ
ンパイプ８内を加圧しながらポリエチレンパイプ８の外
径調整を行い連続運転に入る。Next, an appropriate amount of silicone oil 10 is supplied from the silicone oil tank 11 through the supply pipe 12. Then, pressurized air is sent through the hole 1 of the nipple 2 and the outer diameter of the polyethylene pipe 8 is adjusted while gradually pressurizing the inside of the polyethylene pipe 8 to start continuous operation.
このとき、ポリエチレンパイプ８の成形条件としてのシ
リコーンオイルの塗布は、常温で１〜2cc/分の塗布量
で、塗布圧力は大気圧が適当であった。At this time, the silicone oil was applied as a molding condition for the polyethylene pipe 8 at a coating amount of 1 to 2 cc / min at room temperature, and the atmospheric pressure was suitable as the coating pressure.
上記の成形条件を纏めて次表に示す。The above molding conditions are summarized in the following table.
〔発明の効果〕 この発明の製造方法によれば、ダイ口金とサイジング装
置との微小間隙に馬蹄形状のパッキンを介在してそのパ
ッキン内に粘度:200〜500c.s/25℃、引火点:300℃、表
面張力:21.0〜21.5dyne/cmからなるシリコーンオイル
を、常温かつ大気圧で１〜2cc/minの塗布量で供給して
ダイ口金とサイジング装置との間を当該シリコーンオイ
ルで気密にシールし、押し出されるプラスチックパプを
ダイ口金の直後から当該シリコーンオイルで全周面シー
ルしつつ該シリコーンオイルを付着させながらサイジン
グ装置内に進入させるものであるから、当該微小間隙へ
供給されるシリコーンオイルでダイ口金への熱影響を受
けないようにし、そのシリコーンオイルで押し出される
プラスチックパイプに対する外気の接触を遮断し、押出
直後の高温状態のプラスチックパイプへの空気の抱き込
みが無くなり、而も、プラスチックパイプはシリコーン
オイルを表面に付着しながらサイジング装置内へ進入す
るので、かかるシール用のシリコーンオイルが潤滑作用
をなしてサイジングすることができ、延いては表面にあ
ばた状の如き凹みが無く表面に光沢を持った外観良好な
プラスチックパイプを製造することができるものであ
る。 (Effect of the Invention) According to the manufacturing method of the present invention, a horseshoe-shaped packing is interposed in the minute gap between the die die and the sizing device, and the viscosity in the packing is 200 to 500 c.s / 25 ° C., the flash point: A silicone oil consisting of 300 ° C and a surface tension of 21.0 to 21.5 dyne / cm is supplied at a coating amount of 1 to 2 cc / min at room temperature and atmospheric pressure, and the silicone oil is hermetically sealed between the die die and the sizing device. Since the plastic pap that is sealed and extruded is inserted into the sizing device while the silicone oil is adhered while sealing the entire surface of the plastic pap immediately after the die base, the silicone oil supplied to the minute gap. To prevent the die die from being affected by heat, block the contact of outside air to the plastic pipe extruded by the silicone oil, and press in the hot state immediately after extrusion. Since air is not caught in the stick pipe, and because the plastic pipe enters the sizing device while adhering silicone oil to the surface, the silicone oil for sealing can perform sizing with a lubricating effect. As a result, it is possible to manufacture a plastic pipe which has no dents such as pits on the surface and has a glossy surface with a good appearance.
また、本発明によれば、シール用液体としてシリコーン
オイルを用いているので、該オイルがプラスチックパイ
プの表面に付着した後、油分が当該パイプの表面に残
り、後工程の冷却水槽内に進んだ際に好適な徐冷が行
え、パイプの表面に残る歪みを小さく抑えることができ
る。而も、油分によってパイプ表面の滑りが良好である
ので、ハンドリング及び長尺巻取のときパイプ相互の擦
れによる外傷が付きにくい。さらに、シリコーンオイル
では、油分が分離するので、冷却水からの油分の回収が
容易となり、公害問題対策の面からも好ましいものとな
る。等々、実用上の効果は甚大である。Further, according to the present invention, since silicone oil is used as the sealing liquid, after the oil adheres to the surface of the plastic pipe, oil remains on the surface of the pipe and advances into the cooling water tank in the subsequent step. At this time, suitable gradual cooling can be performed, and the strain remaining on the surface of the pipe can be suppressed to a small level. Moreover, since the oil causes the slip of the pipe surface to be favorable, external damage due to the rubbing of the pipes during handling and long winding is less likely to occur. Furthermore, since the oil component is separated from the silicone oil, it is easy to recover the oil component from the cooling water, which is also preferable in terms of measures against pollution problems. And so on, the practical effect is enormous.
第１図は、この発明のプラスチックパイプの製造方法に
使用する外部サイジング装置と押出機との関係を示す概
略断面図、第２図は、従来例における外部サイジング装
置と押出機との関係を示す概略断面図である。 符号において、３はダイ口金、７はサイジング装置、８
はポリエチレンパイプ、９は馬蹄形状のパッキン、10は
シール用液体（シリコーンオイル）である。FIG. 1 is a schematic sectional view showing the relationship between an external sizing device and an extruder used in the method for manufacturing a plastic pipe of the present invention, and FIG. 2 shows the relationship between the external sizing device and the extruder in a conventional example. It is a schematic sectional drawing. In the reference numeral, 3 is a die base, 7 is a sizing device, and 8
Is a polyethylene pipe, 9 is a horseshoe-shaped packing, and 10 is a sealing liquid (silicone oil).
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭56−82223（ＪＰ，Ａ) 特開 昭55−95538（ＪＰ，Ａ) 特開 昭58−142826（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-82223 (JP, A) JP-A-55-95538 (JP, A) JP-A-58-142826 (JP, A)
Claims (1)
の押出機で製造する製造方法において、 押出機のダイ口金とサイジング装置との間に設定された
微小間隙（0.5〜1.5mm）に、馬蹄形状のパッキンを介在
してそのパッキン内へ粘度:200〜500c.s/25℃、引火点:
300℃、表面張力:21.0〜21.5dyne/cmからなるシリコー
ンオイルを、常温かつ大気圧で１〜2cc/minの塗布量で
供給してダイ口金とサイジング装置との間を当該シリコ
ーンオイルで気密にシールし、押し出されるプラスチッ
クパイプをダイ口金の直後から当該シリコーンオイルで
全周面シールしつつ該シリコーンオイルを付着させなが
らサイジング装置内へ進入させてサイジングすることを
特徴とするプラスチックパイプの製造方法。1. A manufacturing method for manufacturing a plastic pipe by an external sizing type extruder, wherein a horseshoe-shaped packing is provided in a minute gap (0.5 to 1.5 mm) set between the die die of the extruder and the sizing device. Viscosity: 200-500c.s / 25 ℃, flash point:
A silicone oil consisting of 300 ° C and a surface tension of 21.0 to 21.5 dyne / cm is supplied at a coating amount of 1 to 2 cc / min at room temperature and atmospheric pressure, and the silicone oil is hermetically sealed between the die die and the sizing device. A method for producing a plastic pipe, which comprises sealing and extruding a plastic pipe immediately after the die cap, sealing the entire surface with the silicone oil, advancing into the sizing device while adhering the silicone oil, and sizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60208000A JPH0677957B2 (en) | 1985-09-20 | 1985-09-20 | Plastic pipe manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60208000A JPH0677957B2 (en) | 1985-09-20 | 1985-09-20 | Plastic pipe manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6268727A JPS6268727A (en) | 1987-03-28 |
| JPH0677957B2 true JPH0677957B2 (en) | 1994-10-05 |
Family
ID=16549012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60208000A Expired - Lifetime JPH0677957B2 (en) | 1985-09-20 | 1985-09-20 | Plastic pipe manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0677957B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104842536A (en) * | 2015-05-14 | 2015-08-19 | 黄圣渊 | PETG vacuum extruding molding processing equipment and production process thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5595538A (en) * | 1979-01-16 | 1980-07-19 | Sekisui Chem Co Ltd | Resin tube fabrication apparatus |
| JPS5682223A (en) * | 1979-12-11 | 1981-07-04 | Kureha Chem Ind Co Ltd | Outer diameter sizing method, tube manufactured thereby and sizing die used therefor |
| JPS58142826A (en) * | 1982-02-18 | 1983-08-25 | Mitsubishi Petrochem Co Ltd | Thermoplastic resin pipe molding method |
-
1985
- 1985-09-20 JP JP60208000A patent/JPH0677957B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6268727A (en) | 1987-03-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2519375A (en) | Method and apparatus for molding tubing | |
| FI85413B (en) | SAETT VID TILLVERKNING AV VAERMEISOLERAT ROER SAMT ANORDNING VID EXTRUDER FOER TILLVERKNING AV ROERET. | |
| FI74654B (en) | ANALYZING OVER FREQUENCY FRAMING PROCESSING. | |
| KR870000161A (en) | Continuous Vulcanization Method of Hoose | |
| JPH09207200A (en) | Manufacturing method of thick-walled pipe made of polyethylene | |
| US2620515A (en) | Extrusion method and apparatus | |
| JPH0677957B2 (en) | Plastic pipe manufacturing method | |
| EP0380686A1 (en) | Production method of rubber tube and resin coating apparatus used therefor | |
| BR9800591A (en) | Method of manufacturing cellulose wrap for food | |
| GB223362A (en) | Improvements in or relating to the manufacture of confectionery | |
| CN87103629A (en) | Production device for interlayer threaded pipe | |
| USRE19329E (en) | Process of and apparatus for manu | |
| JPS5831290B2 (en) | Manufacturing equipment for spirally corrugated plastic pipes | |
| US2688766A (en) | Method and apparatus for producing and drying synthetic sausage casings | |
| JPS56142029A (en) | Production of lined metallic pipe | |
| JPS5971841A (en) | Method and apparatus for extrusion molding and vulcanization of rubber | |
| JPS5930146B2 (en) | Method for manufacturing heat-shrinkable tube | |
| JPH0228039Y2 (en) | ||
| JPS633785Y2 (en) | ||
| JPS6119334A (en) | Manufacturing device of heat-shrinkable resin tube | |
| JPS585235A (en) | Manufacture of plastic pipe | |
| JPH0414425A (en) | Preparation of synthetic resin pipe having spiral rib or groove formed to its inner surface | |
| JPS5812846Y2 (en) | Circular die for synthetic resin molding | |
| JPH0636906Y2 (en) | Continuous molding equipment for heat shrinkable tubes | |
| JPS6250966B2 (en) |