GB563121A - Improvements in or relating to method of and apparatus for shaping plastics by extrusion - Google Patents

Improvements in or relating to method of and apparatus for shaping plastics by extrusion

Info

Publication number
GB563121A
GB563121A GB6166/42A GB616642A GB563121A GB 563121 A GB563121 A GB 563121A GB 6166/42 A GB6166/42 A GB 6166/42A GB 616642 A GB616642 A GB 616642A GB 563121 A GB563121 A GB 563121A
Authority
GB
United Kingdom
Prior art keywords
die
lubricant
valve
rod
opened
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
Application number
GB6166/42A
Other languages
English (en)
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.)
Plax Corp
Original Assignee
Plax Corp
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 Plax Corp filed Critical Plax Corp
Publication of GB563121A publication Critical patent/GB563121A/en
Expired legal-status Critical Current

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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/60—Releasing, lubricating or separating agents
    • 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
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • 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
    • B29C48/06—Rod-shaped
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • B29C48/832—Heating
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
    • B29C48/865—Heating
    • 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
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/914—Cooling drums
    • 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
    • B29C48/94—Lubricating
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0027—Cutting off
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • 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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. 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
    • B29C48/03—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
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • 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
    • B29C48/90—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/115—Lubricator

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
GB6166/42A 1941-04-23 1942-05-07 Improvements in or relating to method of and apparatus for shaping plastics by extrusion Expired GB563121A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US389912A US2365375A (en) 1941-04-23 1941-04-23 Method of shaping plastics by extrusion

Publications (1)

Publication Number Publication Date
GB563121A true GB563121A (en) 1944-08-01

Family

ID=23540275

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6166/42A Expired GB563121A (en) 1941-04-23 1942-05-07 Improvements in or relating to method of and apparatus for shaping plastics by extrusion

Country Status (6)

Country Link
US (2) US2365375A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA427868A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE872866C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ES (1) ES178313A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB563121A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL68924C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145961A (en) * 1983-07-01 1985-04-11 Mitsubishi Petrochemical Co Method of producing crosslinked foam articles
CN111655374A (zh) * 2017-11-30 2020-09-11 康宁股份有限公司 具有封装或一体式过滤器的移液器、其形成方法和设备
CN114606045A (zh) * 2022-03-26 2022-06-10 王富 一种润滑油及其制备方法

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE482440A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1947-05-17 1900-01-01
US2512844A (en) * 1947-06-30 1950-06-27 Yardley Plastics Company Machine for extruding plastic tubes
US2567147A (en) * 1947-07-16 1951-09-04 Chrysler Corp Lubricating mechanism for injection molding apparatus
BE483799A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1947-07-26 1900-01-01
US2537977A (en) * 1948-07-15 1951-01-16 Dow Chemical Co Method of making a shaped thermoplastic cellular product
US2577743A (en) * 1948-10-22 1951-12-11 Dow Chemical Co Method and composition for production of cellular thermoplastic products
US2620515A (en) * 1949-02-16 1952-12-09 Us Rubber Co Extrusion method and apparatus
US2624914A (en) * 1949-11-01 1953-01-13 Us Rubber Co Plastic spreading method and apparatus
US2752315A (en) * 1950-09-02 1956-06-26 Curtiss Wright Corp Polymerized styrene molding compositions
US2719330A (en) * 1951-03-13 1955-10-04 Polymer Corp Method for making polyamide rod stock
US2736057A (en) * 1952-05-19 1956-02-28 Equipment for making elongated shapes from polyamides
US2802237A (en) * 1954-05-10 1957-08-13 Polymer Corp Formation of elongated thermoplastic shapes in vibratory forming tube
BE557755A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1955-03-08 1900-01-01
BE548552A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1955-06-14 1900-01-01
US2895170A (en) * 1956-05-01 1959-07-21 Talon Inc Method of making adjustable fastener track
DE1126587B (de) * 1956-07-06 1962-03-29 Organico S A Vorrichtung zur Herstellung von festen Granulaten aus schmelzfluessigen Hochpolymeren
DE1124668B (de) * 1956-09-19 1962-03-01 Armando Podesta Pressform zum Kaltformen von Hohlgegenstaenden, insbesondere Verschlusskapseln, aus thermoplastischen Kunststoffen
US3003223A (en) * 1957-03-25 1961-10-10 Du Pont Metal core composite filaments
US2962760A (en) * 1958-01-16 1960-12-06 Du Pont Formation of rod stock from thermoplastic materials
DE1753526B1 (de) * 1960-05-06 1969-09-04 Ruhrchemie Ag Verfahren zum Herstellen von Rundstaeben aus Niederdruck-Polyaethylen mit einem Molekulargewicht von 1000 000
CH431319A (de) * 1964-04-02 1967-02-28 Eldima Ag Zwischen einer Strangpresse und einem Strangverarbeitungsapparat angeordnete Zuführungs- und Steuerungsvorrichtung
US3517097A (en) * 1966-11-23 1970-06-23 Ball Corp Method for forming and curing continuous elastomeric strip
DE2551521C2 (de) * 1975-11-17 1984-11-08 Henkel KGaA, 4000 Düsseldorf Verfahren zur Herstellung von Schmelzharzprofilen
DE2716876C2 (de) * 1976-11-16 1985-10-03 Henkel KGaA, 4000 Düsseldorf Verfahren und Vorrichtung zur Herstellung von einen konstanten Querschnitt aufweisenden Profilstäben aus Schmelzen
FR2416106A1 (fr) * 1978-02-02 1979-08-31 Silec Liaisons Elec Procede et dispositif d'extrusion d'un produit reticule
DE2825414C2 (de) * 1978-06-09 1985-01-03 Moskovskij chimiko-technologičeskij institut imeni D.I. Mendeleeva, Moskau/Moskva Verfahren zur schnellen Extrusion hochviskoser duroplastischer oder thermoplastischer Materialien
US4519759A (en) * 1982-08-23 1985-05-28 Cable Technology Laboratories, Inc. Apparatus for making shrinkable tubing
US4583487A (en) * 1983-09-02 1986-04-22 Wood Horace G Method and apparatus for cyclically dispensing lubricants and colorings for use in injection molding machines
DE4333480A1 (de) * 1993-10-01 1995-04-06 Krupp Ag Hoesch Krupp Verfahren und Vorrichtung zur Lagerung und/oder Führung längskraftbeanspruchter elastisch oder plastisch verformbarer Voll- oder Hohlprofilkörper
US7476352B2 (en) * 2004-05-21 2009-01-13 3M Innovative Properties Company Lubricated flow fiber extrusion
CN112552573A (zh) * 2020-12-09 2021-03-26 天津诚远包装制品股份有限公司 一种塑料酸奶瓶的生产加工方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL37479C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1932-10-24 1900-01-01
DE673607C (de) * 1933-03-15 1939-03-25 I G Farbenindustrie Akt Ges Verfahren zum Herstellen von Folien
DE630036C (de) * 1933-11-14 1936-05-19 Dynamit Act Ges Vormals Alfred Verfahren zur Herstellung biegsamer Folien

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145961A (en) * 1983-07-01 1985-04-11 Mitsubishi Petrochemical Co Method of producing crosslinked foam articles
CN111655374A (zh) * 2017-11-30 2020-09-11 康宁股份有限公司 具有封装或一体式过滤器的移液器、其形成方法和设备
CN111655374B (zh) * 2017-11-30 2022-05-10 康宁股份有限公司 具有封装或一体式过滤器的移液器、其形成方法和设备
CN114606045A (zh) * 2022-03-26 2022-06-10 王富 一种润滑油及其制备方法
CN114606045B (zh) * 2022-03-26 2022-12-16 孚迪斯石油化工（葫芦岛）有限公司 一种润滑油及其制备方法

Also Published As

Publication number Publication date
ES178313A1 (es) 1947-08-01
US2393452A (en) 1946-01-22
CA427868A (en) 1945-05-29
NL68924C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1951-06-15
US2365375A (en) 1944-12-19
DE872866C (de) 1953-04-09

Similar Documents

Publication Publication Date Title
GB563121A (en) Improvements in or relating to method of and apparatus for shaping plastics by extrusion
US3394568A (en) Apparatus for rolling seamless tubes
CN105172116B (zh) 用于制造双轴定向管子的方法和设备
US3078513A (en) Apparatus for extruding thermoplastic material
US4009982A (en) Mechanism for forming an enlarged coupling on the ends of plastic pipe
CN108817121B (zh) 一种恒温高速挤压液氮冷却装置及冷却工艺
WO1990002644A1 (en) Method of pipe manufacture
CN107263579A (zh) 一种塑料管裁剪装置及裁剪方法
US3114931A (en) Internal air cooling of blow molded articles
GB948937A (en) Method and apparatus for producing films of organic thermoplastic material having improved optical properties
CN105172097A (zh) 一种在线双轴取向塑料小口径管材的挤出成型模具
GB960715A (en) Method and apparatus for producing conduit formed from a thermoplastic materia
CN105196514A (zh) 一种在线双轴取向塑料大口径管材的挤出成型模具
US3588956A (en) Apparatus and method for controlling temperature in a feed screw
GB714194A (en) Improvements in or relating to apparatus for the extrusion of thermoplastic material
US2231761A (en) Press for the extrusion of metals
US2594842A (en) Method and apparatus for producing plastic tubing
CN206201469U (zh) 一种管材扩口加热装置
US6135749A (en) Apparatus for forming oriented plastic pipe
US2870522A (en) Apparatus for manufacturing tubing
KR102187087B1 (ko) 액체질소와 기체질소의 선택적 냉각을 이용한 압출기용 냉각 시스템
US3172536A (en) Extrusion of metals of hollow section
CN208894874U (zh) 一种拉丝模盒
CN1155464C (zh) 制造径、轴双向拉伸或径向单向拉伸塑料管的方法及装置
US3013311A (en) Tubing manufacture