DE1504413A1 - Method and device for the production of plastic pipes, in particular rigid PVC pipes, suitable for gas and / or water transport, and plastic pipes produced according to this process - Google Patents

Method and device for the production of plastic pipes, in particular rigid PVC pipes, suitable for gas and / or water transport, and plastic pipes produced according to this process

Info

Publication number
DE1504413A1
DE1504413A1 DE19641504413 DE1504413A DE1504413A1 DE 1504413 A1 DE1504413 A1 DE 1504413A1 DE 19641504413 DE19641504413 DE 19641504413 DE 1504413 A DE1504413 A DE 1504413A DE 1504413 A1 DE1504413 A1 DE 1504413A1
Authority
DE
Germany
Prior art keywords
tubes
cooling
pipes
temperatures
plastic pipes
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
DE19641504413
Other languages
German (de)
Other versions
DE1504413B2 (en
Inventor
Van Der Wal Adolf Anne
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.)
Wavin BV
Original Assignee
Wavin BV
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 Wavin BV filed Critical Wavin BV
Publication of DE1504413A1 publication Critical patent/DE1504413A1/en
Publication of DE1504413B2 publication Critical patent/DE1504413B2/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/12—Rigid pipes of plastics with or without reinforcement
    • F16L9/127—Rigid pipes of plastics with or without reinforcement the walls consisting of a single layer
    • 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
    • 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
    • B29C48/908—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
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B29C48/913—Cooling of hollow articles of tubular films externally

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Description

Nürnberg, den 17. September 1964 17/32Nuremberg, September 17, 1964 17/32

Industrielle Onderneming Wavin N.V0 Oude Veerweg 1, ZwolleIndustrial Onderneming Wavin NV 0 Oude Veerweg 1, Zwolle

HollandHolland

μ Verfahren und Vorrichtung zur Herstellung von Kunststoffröhren, insbesondere starren PVO-Röhren, geeignet für Gas— und/oder Waaaertransport, und Kunststoffröhren hergestellt nach diesem Verfahren"μ Process and device for the production of plastic pipes, especially rigid PVO tubes, suitable for gas and / or Waaaertransport, and plastic tubes made according to this procedure "

Die Erfindung bezieht sich auf ein Verfahren zur Herstellung von Kunststoffröhren, insbesondere starren PVC-Rohren, geeignet für Gas- und/oder Wassertransport, durch Extrusion einer Kunststoffmasse und Abkühlen der extrudierten und kalibrierten Röhren«The invention relates to a method for the production of plastic pipes, in particular rigid PVC pipes, suitable for gas and / or water transport, by extruding a plastic mass and cooling the extruded and calibrated Tubes "

Nach diesem bekannten Verfahren hergestellte Kunststoffröhren zeigen eine Anzahl unerwünschter Eigenschaften · ■ · ,, so daß diese Röhren für bestimmte Anwendungen ungeeignet sind.Plastic pipes produced by this known method show a number of undesirable properties so that these tubes are unsuitable for certain applications.

Ea ist bereits bekannt, daß bei Anwendung dieser Röhren für Transport von Stadtgas oder Erdgas infolge der Wirkung des oder der zum Gas hinzugefügten Benzols, aromatischer Kohlenwasserstoffe und Odoranten (z.B, Merkaptiden} auf Bereichen mit inneren Spannungen in den Röhren Haarrisse entstehen· Bieser Nachteil ist als Spannungskorrosion bekannt, wobei sowohl die Art, die Konzentration der obenerwähnten Verbin-Ea is already known that when using these tubes for Transport of town gas or natural gas as a result of the action of the benzene or aromatic hydrocarbons added to the gas and odorants (e.g., mercaptids) on areas with internal stresses in the tubes hairline cracks develop · This disadvantage is known as stress corrosion, whereby both the nature, the concentration of the abovementioned compounds

PAD ORIGINAL —2«·PAD ORIGINAL —2 «·

düngen, die Anwendungstemperatur der Röhren (d.h. die Gasdif fusions geschwindigkeit)-, wie auch die inneren Spannungen eine grosse Rolle spielen.fertilize, the application temperature of the tubes (i.e. the gas diff fusion speed) - as well as the internal tensions play a major role.

Infolge der Mikroporosität auf einem Molekularniveau, welche während der Herstellung der Röhren entsteht, dringen Benzol und die anderen Verbindungen in die Röhrenwand und geben Anlaß zur Quellung des PVC, wobei die bereits vorhandenen Spannungen die Bildung der Haarrisse verursachen. Die obenerwähnten Spannungen sind zurückzuführen auf eine statistische Orientation in der Molekularstruktur des Kunststoffes während des Extrudierens der Röhren durch den Extruderkopf, des Transports der Röhren durch die Kalibrationsbüchse, in welcher die Röhren den gewünschten Durchmesser bekommen, und des Abkühlens der Röhren. Demzufolge ist die Lebensdauer der PVO-Ga3transportröhren grosser für Röhren mit einer kleinstmöglichen Mikroporosität und Spannung.Due to the microporosity on a molecular level which Benzene is produced during the manufacture of the tubes and the other connections in the pipe wall and give rise to the swelling of the PVC, with those already present Tensions cause hairline cracks to form. The above-mentioned stresses are due to a statistical one Orientation in the molecular structure of the plastic during the extrusion of the tubes through the extruder head, the transport of the tubes through the calibration sleeve in which the tubes are given the desired diameter, and the cooling of the tubes. As a result, the service life of the PVO-Ga3 transport tubes is longer for tubes with the smallest possible Microporosity and tension.

Zweck der Erfindung ist nun ein Verfahren zur Herstellung von Kunststoffröhren für Gas- und/oder Wassertransport, wobei diese Nachteile nicht auftreten.The purpose of the invention is now a method for the production of plastic pipes for gas and / or water transport, wherein these disadvantages do not occur.

Das erfindungsgemässe Verfahren ist dadurch gekennzeichnet, daß die extrudierten Röhren mindestens 15 Min. einer Wärmebehandlung auf Temperaturen zwischen 70 und 160° C unterworfen werden, und nachfolgend die Röhren abgekühlt werden auf eine Temperatur unter 60° C derart, daß die Benzolabsorption auf einen Wert unter 20 fo herabsinkt.The inventive method is characterized in that the extruded tubes are subjected to at least 15 min. A heat treatment to temperatures between 70 and 160 ° C, and then the tubes are cooled to a temperature below 60 ° C such that the benzene absorption to a value below 20 fo falls.

Die Röhren, hergestellt naeii diesem Verfahren, zeigen einenThe tubes made by this process show one

BAD ORIGINALBATH ORIGINAL

beträchtlich grösseren Widerstand gegen Spannungskorrosion. Schliesslich sind diese Röhren gegen eine höhrere Druckbe- ■ lastung beständig, wobei der Impact (Schlag- bzw. Stoßfestigkeit) der Röhren unverändert bleibt. Vorzugsweise werden die Röhren schnell abgekühlt auf Temperaturen von ungefähr 15 - 20° C, wobei eine schnelle Stabilisierung und hervorragende Resultate erreicht werden.considerably greater resistance to stress corrosion. After all, these tubes are against a higher pressure ■ load-resistant, whereby the impact (impact or shock resistance) of the tubes remains unchanged. Preferably the Tubes quickly cooled to temperatures of around 15 - 20 ° C, with rapid stabilization and excellent Results are achieved.

Die Röhren werden nach einem weiteren Vorschlag der Erfindung vorzugsweise 15 Uin. bis 1 Stunde auf 100° gehalten.According to a further proposal of the invention, the tubes are preferably 15 Uin. held at 100 ° for 1 hour.

Einerseits führt diese Behandlung zu optimalen Eigenschaften des Materials, normalerweise mit einer Benzolabsorption von weniger als 10 fo, während andererseits die für die Herstellung der Röhren notwendige Installation nur in ökonomisch annehmbarer Weise vergrössert werden soll. Da obendrein eine Wärmebehandlung während mehr als 1 Stande auf 100° G die Benzolabsorption nicht verringert, wird eine längere Wärmebehandlung das Produktionsschema nachteilig beeinflussen.On the one hand, this treatment leads to optimal properties of the material, normally with a benzene absorption of less than 10 fo, while on the other hand, the installation necessary for the manufacture of the tubes is only intended to increase in an economically acceptable manner. In addition, since a heat treatment for more than 1 level to 100 ° G does not reduce the benzene absorption, a longer heat treatment will adversely affect the production scheme.

dis-dis-

Bei Anwendung von/Kontinuierlichen Verfahren, d.h. Wärmbbehandlung von normalerweise hergestellten abgesägten Röhren, werden die Röhren in einem Behälter mit Wasser vom 100° G oder einem anderen nicht aggressiven Lösungsmittel behandelt. Im - -kontinuierlichen Verfahren wird die Wärmebehandlung ausgeführt in dem die extruiisrten Röhren mit einer bestimmten Geschwindigkeit durch einen Raum mit einer Temperatur von 70 - 160° C, vorzugsweise 10C° C, geführt werden. Die Durchführgeschwindigkeit wird derart gewählt, daß die Röhren mindestens 15 Minuten in dieser.-Raum verbleiben.When using / continuous processes, i.e. heat treatment from normally manufactured sawed-off tubes, the tubes are placed in a container with water at 100 ° G or another non-aggressive solvent. In the - -continuous process, the heat treatment executed in which the extruded tubes with a certain Speed through a room with a temperature of 70-160 ° C, preferably 10 ° C. The execution speed is chosen so that the tubes remain in this room for at least 15 minutes.

BAD Oi 0 0 9 8 0 9 /: 1 2 9 ι- BAD Oi 0 0 9 8 0 9 /: 1 2 9 ι-

Claims (1)

PatentansprüclieClaimsclie 1. /Verfahren zur Herstellung von Kunststoffrühren, insbesondere starren PVC-Röhren, geeignet für Gas- und/oder Wassertransport, durch. Extrusion einer Kunststoffmasse und Abkühlen dar extrudierten und kalibrierten Röhren, dadurch gekennzeichnet, daß die extrudierten Höhren mindestens 15 Hin. einer Wärmebehandlung auf Temperaturen zwischen 70 und 160 G unterworfen werden, und nachfolgend die Röhren ab- < t gekühlt werden auf eine Temperatur unter 60· C derart, daß die Benzolabsorption auf einen Y/ert unter 20 °jo herabsinkt.1. / Process for the production of plastic pipes, in particular rigid PVC pipes, suitable for gas and / or water transport. Extrusion of a plastic mass and cooling of the extruded and calibrated tubes, characterized in that the extruded tubes are at least 15 Hin. be subjected to a heat treatment to temperatures between 70 and 160 G, and then the tubes are cooled to a temperature below 60 ° C in such a way that the benzene absorption drops to a Y / ert below 20 ° jo . 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Röhren schnell abgekühlt werden auf Temperaturen von ungefähr 15 - 20° C.2. The method according to claim 1, characterized in that the tubes are quickly cooled to temperatures of around 15-20 ° C. 5. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Röhren 15 Uinuten bis 1 Stunde auf 100° C gehalten werden.5. The method according to claim 1 or 2, characterized in that the tubes are held at 100 ° C for 15 minutes to 1 hour will. 4-. Vorrichtung nur Anwendung des Verfahrens nach Anspruch 1-3, bestehend aus einem Extruder, mindestens versehen mit einem üxtruderkopf und Kalibriermitteln für'äas Kalibrieren der Röhren und Kühlmitteln zur schnellen Kühlung der Röhren, welche Vorrichtung erfindungsgemäss dadurch gekennzeichnet ist, daß die Vorrichtung mit Konditionsmitteln zum Erhitzen der Röhren auf Temperaturen zwischen 70 und 160° 0, sowie Mitteln zur Abkühlung der Röhren auf eine Temperatur4-. Device only using the method according to claim 1-3, consisting of an extruder, at least provided with an extruder head and calibration means for calibration the tubes and cooling means for rapid cooling of the tubes, which device is characterized according to the invention is that the device with conditioning means for heating the tubes to temperatures between 70 and 160 ° 0, and means for cooling the tubes to a temperature unter 60° C ausgebildet ist»is formed below 60 ° C » BAD 031-31NALBATHROOM 031-31NAL 009809/1294009809/1294 -2--2- 5. Vorrichtung nach. Anspruch 4, dadurch gekennzeichnet, daß die Mittel zur schnellen Abkühlung der Röhren aus einem flüssigkeitsbehälter versehen mit Mit bein sum Abkühlen-und Regeln der I1IUssigi-:eitstemperatur in dem Flüssigkeitsbehälter, bestehen.5. Device according to. To claim 4, characterized in that the means for rapid cooling of the tubes from a liquid container provided with cooling with leg sum-and rules of the I 1 IUssigi-: eitstemperatur, exist in the liquid container. 6. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Konditioniermittel zur Wärmebehandlung der Röhren bei Temperaturen zwischen 70 und 160° G aus einom Kalibrierorgan bestehen»6. Apparatus according to claim 4, characterized in that the conditioning agents contribute to the heat treatment of the tubes Temperatures between 70 and 160 ° G from a calibration device exist" ÖU98U971294ÖU98U971294 BAD 0.vo5MALBATHROOM 0. VO5 TIMES LeerseiteBlank page
DE19641504413 1963-09-19 1964-09-19 METHOD OF MANUFACTURING PIPES FROM POLYVINYL CHLORIDE Pending DE1504413B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL298140 1963-09-19

Publications (2)

Publication Number Publication Date
DE1504413A1 true DE1504413A1 (en) 1970-02-26
DE1504413B2 DE1504413B2 (en) 1971-12-16

Family

ID=19755062

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19641504413 Pending DE1504413B2 (en) 1963-09-19 1964-09-19 METHOD OF MANUFACTURING PIPES FROM POLYVINYL CHLORIDE

Country Status (6)

Country Link
AT (1) AT292291B (en)
BE (1) BE652970A (en)
DE (1) DE1504413B2 (en)
DK (1) DK118847B (en)
GB (1) GB1081935A (en)
NL (1) NL298140A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL176804C (en) * 1977-04-06 1985-06-03 Wavin Bv PLASTIC TUBE WITH LONG CHANNELS IN HIS WALL, AND METHOD FOR MANUFACTURING SUCH PLASTIC TUBE.
IT1319047B1 (en) * 2000-10-18 2003-09-23 Bandera Luigi Mecc Spa CALIBRATOR FOR PLASTIC PIPES

Also Published As

Publication number Publication date
NL298140A (en) 1900-01-01
DE1504413B2 (en) 1971-12-16
AT292291B (en) 1971-08-25
BE652970A (en) 1964-12-31
DK118847B (en) 1970-10-12
GB1081935A (en) 1967-09-06

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