DE1131391B - Process for consolidating pipes - Google Patents

Process for consolidating pipes

Info

Publication number
DE1131391B
DE1131391B DEF19072A DEF0019072A DE1131391B DE 1131391 B DE1131391 B DE 1131391B DE F19072 A DEF19072 A DE F19072A DE F0019072 A DEF0019072 A DE F0019072A DE 1131391 B DE1131391 B DE 1131391B
Authority
DE
Germany
Prior art keywords
pipes
polyvinyl chloride
expanded
expansion
hemispherical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DEF19072A
Other languages
German (de)
Inventor
Georg Diedrich
Dipl-Ing Erwin Gaube
Dr-Ing Kurt Richard
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.)
Hoechst AG
Original Assignee
Hoechst AG
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 Hoechst AG filed Critical Hoechst AG
Priority to DEF19072A priority Critical patent/DE1131391B/en
Priority to FR798950A priority patent/FR1238367A/en
Priority to GB23208/59A priority patent/GB930323A/en
Priority to BE580497A priority patent/BE580497A/en
Publication of DE1131391B publication Critical patent/DE1131391B/en
Pending 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
    • B29C49/6445—Thermal conditioning of preforms characterised by temperature differential through the preform length
    • 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
    • B29C48/885—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
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/91—Heating, e.g. for cross linking
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/22—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
    • B29C55/24—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes radial
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • 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
    • B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
    • 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
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/06—PVC, i.e. polyvinylchloride
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Description

Verfahren zur Verfestigung von Rohren Die vorliegende Erfindung bezieht sich auf ein Verfahren zur Verfestigung von Rohren aus Polyvinylchlorid und dessen Mischpolymerisaten.Method of consolidating pipes The present invention relates to refers to a method of solidifying pipes made of polyvinyl chloride and its Copolymers.

Es ist bekannt, daß man aus makromolekularen Stoffen, wie Polyvinylchlorid, Rohre herstellen kann, indem man das Material bei einer Temperatur, die oberhalb des Erweichungsbereiches liegt, aus der Ringdüse einer Strangpresse austreten läßt. Nach dem Stande der Technik liegt.diese Temperatur sowohl für Emulsions- als auch für Suspensionspolyvinylchlorid zwischen 160 und 2000 C. Es ist weiterhin bekannt, Rohre aus Polyvinylchlorid zum Zwecke der Kalibrierung um geringe Beträge (etwa 10 0/o) durch inneren Überdruck aufzuweiten. Ziel dieses Verfahrens ist es, einen genormten Außendurchmesser des Rohres genau einzuhalten. Es wird zu diesem Zweck unmittelbar nach Austritt aus der Ringdüse des Extruders in eine gekühlte zylindrische Hülse geführt, deren Innendurchmesser gleich dem genormten Durchmesser des Rohres ist. Durch inneren Überdruck wird das 160 bis 2000 0 heiße Rohr gegen die Kalibrierhülse gepreßt und dabei gegebenenfalls aufgeweitet, damit es den genormten Durchmesser annimmt. Dabei wird keine Verfestigung erzielt, da die Aufweitung zu klein und die Temperatur zu hoch ist. It is known that macromolecular substances such as polyvinyl chloride, Pipes can be manufactured by keeping the material at a temperature that is above of the softening range, can emerge from the annular nozzle of an extrusion press. According to the state of the art, this temperature is for both emulsion and for suspension polyvinyl chloride between 160 and 2000 C. It is also known Polyvinyl chloride pipes for the purpose of calibration by small amounts (approx 10 0 / o) by internal overpressure. The aim of this procedure is to create a to strictly adhere to the standardized outer diameter of the pipe. It will do this for that purpose immediately after exiting the ring nozzle of the extruder into a cooled cylindrical one Guided sleeve, the inner diameter of which is equal to the standardized diameter of the pipe is. The 160 to 2000 0 hot tube is pressed against the calibration sleeve by internal overpressure pressed and expanded if necessary, so that it has the standardized diameter accepts. No consolidation is achieved because the expansion is too small and the Temperature is too high.

Ferner ist bekannt, Rohre über der Fließtemperatur, z. B. bei 210 bis 2500 C, zu recken. Dabei soll die Sprödigkeit vermindert und die Arbeitsgeschwindigkeit erhöht werden; eine Festigkeitssteigerung wird dabei nicht erzielt. It is also known that pipes above the flow temperature, e.g. B. at 210 up to 2500 C, to stretch. The aim is to reduce the brittleness and the working speed increase; an increase in strength is not achieved.

Es ist weiterhin bekannt, Rohre aus Polystyrol im warmformbaren Temperaturbereich durch inneren Überdruck gegen einen Formkanal aufzuweiten mit dem Ziel, eine Verminderung der Sprödigkeit herbeizuführen. It is also known that polystyrene pipes in the thermoformable temperature range to expand by internal overpressure against a molding channel with the aim of a reduction to bring about brittleness.

Ferner ist es auch bekannt, Rohre aus Polystyrol bei Temperaturen unterhalb des Erweichungspunktes durch inneren Überdruck aufzuweiten und dabei zu verfestigen. Es wurde auch bereits ein Verfahren beschrieben, um Folien, z. B. Polyäthylenfolien, im elastisch-plastischen Bereich zu verstrecken. It is also known to use polystyrene pipes at temperatures expand below the softening point by internal overpressure and thereby to solidify. A method has also already been described in order to produce foils, e.g. B. polyethylene foils, to stretch in the elastic-plastic range.

Es wurde nun gefunden, daß man Polyvinylchloridrohre unter Aufweiten bei höheren Temperaturen und Führen und/oder Kühlen nach der Aufweitung dadurch verfestigen kann, daß man ein Polyvinylchloridrohr bei Temperaturen unterhalb seines Erweichungspunktes oder -bereiches an einem Ende durch Innendruck um den gewünschten Betrag kugelförmig aufweitet und, ausgehend von dem halbkugelförmigen Übergang zwischen dem nicht aufgeweiteten und dem aufgeweiteten Rohrteil, die sukzessive halbkugelförmige Aufweitung des gesamten Rohres um den gleichen Betrag vornimmt. It has now been found that polyvinyl chloride pipes can be expanded with expansion at higher temperatures and guiding and / or cooling after the expansion thereby can solidify that you a polyvinyl chloride pipe at temperatures below his Softening point or range at one end by internal pressure around the desired one Amount widened spherically and, starting from the hemispherical transition between the non-expanded and the expanded tubular part, the successively hemispherical Makes expansion of the entire pipe by the same amount.

Das erfindungsgemäße Verfahren läßt sich auch am Erweichungspunkt oder -bereich oder kurz darüber durchführen. In diesem Falle sind jedoch relativ größere Aufweitungen erforderlich, und es ist von Vorteil, daß die Aufweitung schnell erfolgt und das aufgeweitete Rohr rasch abgekühlt wird. The process according to the invention can also be carried out at the softening point or range or just above it. In this case, however, are relative larger enlargements are required, and it is advantageous that the enlargement takes place quickly takes place and the expanded tube is rapidly cooled.

Nach dem vorliegenden Verfahren lassen sich bei Temperaturen über etwa 500 0 durch Innendruck gleichmäßige Aufweitungen ohne Fließstelle von über 1000/0 erzielen. Diese Aufweitungen sind mit beträchtlichen Festigkeitssteigerungen verbunden. Durch die sukzessive halbkugelförmige Aufweitung des Rohres kann eine Festigkeitssteigerung sowohl in Umfangs- als auch in Längsrichtung erzielt werden. According to the present process, temperatures can be over about 500 0 due to internal pressure uniform expansion without a flow point of over Achieve 1000/0. These widenings result in considerable increases in strength tied together. Due to the successive hemispherical expansion of the pipe, a Strength increase can be achieved both in the circumferential and in the longitudinal direction.

Dabei kann das aufgeweitete Rohr geführt oder ge kühlt oder geführt und gekühlt werden. Der Vorteil des erfindungsgemäßen Verfahrens gegenüber den bisher bekannten Verfahren besteht darin, daß es eine gleichzeitige Verfestigung in Umfangs- und Längsrichtung auch von dickwandigen Polyvinylchloridrohren ermöglicht.The expanded tube can be guided or cooled or guided and be cooled. The advantage of the method according to the invention over the previous known method is that there is a simultaneous solidification in circumferential and longitudinal direction also enables thick-walled polyvinyl chloride pipes.

Beispiel Ein Rohrstück aus Polyvinylchlorid mit 3 mm Wanddicke und 25 mm Innendurchmesser wird durch Eintauchen in ein Flüssigkeitsbad auf 600 C erwärmt. Example A pipe section made of polyvinyl chloride with a wall thickness of 3 mm and 25 mm inside diameter is heated to 600 ° C. by immersion in a liquid bath.

Beim Herausnehmen aus dem Bad bleibt das untere geschlossene Ende noch kurze Zeit eingetaucht, so daß dort das Material etwas weicher als am übrigen Rohrstück ist. Durch Innendruck wird das untere Rohrende kugelförmig in einer Hülse mit einem Durchmesser von etwa 60 mm aufgeblasen. Sobald die kugelförmig aufgeblasene Zone an der gekühlte Hülse anliegt, wandert sie sukzessive nach oben übe die gesamte Länge des Rohrstückes weiter. Das sc entstandene Rohrstück hat eine Dicke von etwE 0,75 mm und eine Festigkeit von 800 kg/cm2 in Längsrichtung und Umfangsrichtung gegenüber einer ur sprünglichen Festigkeit von 500 kg/cm2. Die Probestäbe ergeben Bruchdehnungen von etwa 50%; sie lassen sich vielmals biegen, ohne zu brechen.When taken out of the bath, the lower closed end remains immersed for a short time, so that the material there is a little softer than on the rest of it Piece of pipe is. Internal pressure causes the lower end of the pipe to become spherical in a sleeve with a Inflated diameter of about 60 mm. Once the spherical inflated zone rests against the cooled sleeve, it gradually migrates upwards keep practicing the entire length of the pipe. The resulting pipe section has a Thickness of about 0.75 mm and a strength of 800 kg / cm2 in the longitudinal direction and circumferential direction compared to an original strength of 500 kg / cm2. The test bars result Elongations at break of about 50%; they can be bent many times without breaking.

Claims (2)

PATENTANSPRÜCHE: 1. Verfahren zur Verfestigung von Polyvinylchloridrohren, wobei diese Rohre bei höheren Temperaturen aufgeweitet und nach der Aufweitung geführt und/oder gekühlt werden, dadurch gekennzeichnet, daß ein Polyvinylchloridrohr bei Temperaturen unterhalb seines Erweichungspunktes oder -bereiches an einem Ende durch Innendruck um den gewünschten Betrag kugelförmig aufgeweitet und, ausgehend von dem halbkugelförmigen Übergang zwischen dem nicht aufgeweiteten und dem aufgeweiteten Rohrteil, die sukzessive halbkugelförmige Aufweitung des gesamten Rohres um den gleichen Betrag vorgenommen wird. PATENT CLAIMS: 1. Process for strengthening polyvinyl chloride pipes, these tubes expanded at higher temperatures and guided after the expansion and / or be cooled, characterized in that a polyvinyl chloride tube at Temperatures below its softening point or range at one end by internal pressure expanded spherically by the desired amount and, starting from the hemispherical one Transition between the unexpanded and the expanded pipe part, successively hemispherical expansion of the entire tube made by the same amount will. 2. Verfahren nach Anspruch 1, dadurch ge kennzeichnet, daß Temperaturen direkt am Erweichungspunkt oder -bereich oder dicht darüber angewandt werden. 2. The method according to claim 1, characterized in that temperatures applied directly at or just above the softening point or area. In Betracht gezogene Druckschriften: Deutsche Patentschriften Nr. 675 525, 673 607; schweizerische Patentschrift Nr. 290 384. Considered publications: German Patent Specifications No. 675 525, 673 607; Swiss Patent No. 290 384.
DEF19072A 1955-12-16 1955-12-16 Process for consolidating pipes Pending DE1131391B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DEF19072A DE1131391B (en) 1955-12-16 1955-12-16 Process for consolidating pipes
FR798950A FR1238367A (en) 1955-12-16 1959-06-30 Tube stabilization process
GB23208/59A GB930323A (en) 1955-12-16 1959-07-06 Process for strengthening pipes
BE580497A BE580497A (en) 1955-12-16 1959-07-08 Tube stabilization process

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DEF19072A DE1131391B (en) 1955-12-16 1955-12-16 Process for consolidating pipes
FR798950A FR1238367A (en) 1955-12-16 1959-06-30 Tube stabilization process
GB23208/59A GB930323A (en) 1955-12-16 1959-07-06 Process for strengthening pipes

Publications (1)

Publication Number Publication Date
DE1131391B true DE1131391B (en) 1962-06-14

Family

ID=38543931

Family Applications (1)

Application Number Title Priority Date Filing Date
DEF19072A Pending DE1131391B (en) 1955-12-16 1955-12-16 Process for consolidating pipes

Country Status (4)

Country Link
BE (1) BE580497A (en)
DE (1) DE1131391B (en)
FR (1) FR1238367A (en)
GB (1) GB930323A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2405121A1 (en) * 1976-09-23 1979-05-04 Yorkshire Imperial Plastics Radial lamination of coaxial thermoplastic tubes - to make composite oriented pipe, to stiffen sockets or provide thermal insulation
FR2510940A1 (en) * 1981-08-06 1983-02-11 Solvay PROCESS AND APPARATUS FOR THE MANUFACTURE OF MOLECULAR ORIENTED PLASTIC PIPES

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315308A (en) * 1962-02-15 1967-04-25 Phillips Petroleum Co Continuous production of biaxially oriented, crystalline, thermoplastic film

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE673607C (en) * 1933-03-15 1939-03-25 I G Farbenindustrie Akt Ges Process for the production of foils
DE675525C (en) * 1934-02-14 1939-05-11 Siemens Schuckertwerke Akt Ges Process for the production of long, hollow and, in particular, thin-walled molded bodies from an organic plastic
CH290384A (en) * 1950-06-03 1953-04-30 Cellulose Sidac Societe Anonym Process for the production of a continuous film of organic plastic material by extrusion and apparatus for carrying out the process.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE673607C (en) * 1933-03-15 1939-03-25 I G Farbenindustrie Akt Ges Process for the production of foils
DE675525C (en) * 1934-02-14 1939-05-11 Siemens Schuckertwerke Akt Ges Process for the production of long, hollow and, in particular, thin-walled molded bodies from an organic plastic
CH290384A (en) * 1950-06-03 1953-04-30 Cellulose Sidac Societe Anonym Process for the production of a continuous film of organic plastic material by extrusion and apparatus for carrying out the process.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2405121A1 (en) * 1976-09-23 1979-05-04 Yorkshire Imperial Plastics Radial lamination of coaxial thermoplastic tubes - to make composite oriented pipe, to stiffen sockets or provide thermal insulation
FR2510940A1 (en) * 1981-08-06 1983-02-11 Solvay PROCESS AND APPARATUS FOR THE MANUFACTURE OF MOLECULAR ORIENTED PLASTIC PIPES
EP0072064A1 (en) * 1981-08-06 1983-02-16 SOLVAY & Cie (Société Anonyme) Method and apparatus for manufacturing molecular-oriented tubes

Also Published As

Publication number Publication date
BE580497A (en) 1960-01-08
FR1238367A (en) 1960-08-12
GB930323A (en) 1963-07-03

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