DE1504413B2 - METHOD OF MANUFACTURING PIPES FROM POLYVINYL CHLORIDE - Google Patents
METHOD OF MANUFACTURING PIPES FROM POLYVINYL CHLORIDEInfo
- Publication number
- DE1504413B2 DE1504413B2 DE19641504413 DE1504413A DE1504413B2 DE 1504413 B2 DE1504413 B2 DE 1504413B2 DE 19641504413 DE19641504413 DE 19641504413 DE 1504413 A DE1504413 A DE 1504413A DE 1504413 B2 DE1504413 B2 DE 1504413B2
- Authority
- DE
- Germany
- Prior art keywords
- tubes
- polyvinyl chloride
- extruded
- minutes
- 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
Links
- 239000004800 polyvinyl chloride Substances 0.000 title claims description 12
- 229920000915 polyvinyl chloride Polymers 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- IHPYMWDTONKSCO-UHFFFAOYSA-N 2,2'-piperazine-1,4-diylbisethanesulfonic acid Chemical compound OS(=O)(=O)CCN1CCN(CCS(O)(=O)=O)CC1 IHPYMWDTONKSCO-UHFFFAOYSA-N 0.000 title 1
- 239000007990 PIPES buffer Substances 0.000 title 1
- 238000000034 method Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 18
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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
Die Erfindung betrifft ein Verfahren zur Herstellung von Röhren aus Polyvinylchlorid, insbesondere für den Transport von Gasen, durch Extrudieren einer Polyvinylchlorid-Masse und Abkühlen der extrudierten und kalibrierten Rohre auf Temperaturen unter 70° C.The invention relates to a method for the production of tubes from polyvinyl chloride, in particular for the transport of gases, by extruding a polyvinyl chloride mass and cooling the extruded one and calibrated pipes to temperatures below 70 ° C.
Die nach dem bekannten Verfahren hergestellten Röhren aus Polyvinylchlorid sind wegen einer Reihe nachteiliger Eigenschaften für den Transport von Stadtgasen bzw. Erdgas ungeeignet. Stadt- oder Erdgas enthält aromatische Kohlenwasserstoffe, insbesondere Benzol und Odorantien, wie z. B. Merkap- : tane. Die Anwesenheit derartiger Verbindungen im zu transportierenden Gas läßt in den Röhren aus Polyvinylchlorid in den Bereichen innerer Spannungen Haarrisse entstehen. Dieser als Spannungskorrosion bekannte Effekt ist abhängig von der Art und der Konzentration dieser Stoffe, von der Temperatur der Röhren (Gasdiffusionsgeschwindigkeit) und von den inneren Spannungen.The tubes made of polyvinyl chloride produced by the known method are because of a number disadvantageous properties for the transport of town gases or natural gas unsuitable. Town or natural gas contains aromatic hydrocarbons, especially benzene and odorants, such as. B. Merkap-: tane. The presence of such compounds in the gas to be transported leaves out in the tubes Polyvinyl chloride creates hairline cracks in the areas of internal tension. This as stress corrosion known effect depends on the type and concentration of these substances, on the temperature of the tubes (gas diffusion speed) and of the internal stresses.
Infolge der Mikroporosität im Molekularbereich, welche während der Herstellung der Röhren entsteht, dringen Benzol und die anderen Verbindungen in die Röhrenwand und geben Anlaß zu einem Aufquellen des Polyvinylchlorids, wobei die bereits vorhandenen Spannungen die Bildung der Haarrisse verursachen. Diese Spannungen sind zurückzuführen auf eine statistische Orientierung in der Molekularstruktur des Kunststoffes während des Extrudierens der Röhren durch den Extruderkopf, des Transportes der Röhren durch die Kalibrationsbüchse, in welcher die Röhren den gewünschten Durchmesser erhalten und des Abkühlens der Röhren. Die Lebensdauer der Polyvinylchlorid-Gastransportröhren ist demnach für Röhren mit einer kleinstmöglichen Mikroporosität und Spannung am höchsten.Due to the microporosity in the molecular range, which occurs during the manufacture of the tubes, Benzene and the other compounds penetrate the tube wall and cause swelling of the polyvinyl chloride, whereby the already existing tensions cause the formation of hairline cracks. These tensions are due to a statistical 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 cooling down of the tubes. The life of the polyvinyl chloride gas transport tubes is therefore for tubes with the smallest possible microporosity and tension the highest.
Es ist bekannt, (britische Patentschrift 920 375). Rühren aus hochmolekularen, thermoplastischen Polycarbonaten gegen Spannungskorrosionen widerstandsfähig zu machen, indem die aus dem Extruder kommenden Röhren aus hochmolekularen, thermoplastischen Polycarbonaten unmittelbar nach ihrer Herstellung einem Tempern, d. h., einer Wärmebehandlung von mehreren Stunden unterzogen werden, die bei Temperaturen zwischen 70 bis 145° C durchgeführt wird. Dabei ist gleichzeitig der Extruder aufgeheizt.It is known (British Patent 920,375). Stirring from high molecular weight, thermoplastic Making polycarbonates resistant to stress corrosion by removing them from the extruder coming tubes made of high molecular weight, thermoplastic polycarbonates immediately after their Making an annealing, d. that is, subjected to a heat treatment of several hours, which is carried out at temperatures between 70 to 145 ° C. This is also the extruder heated up.
Der Erfindung liegt demgegenüber die Aufgabe zugrunde, ein Verfahren zur Behandlung von Rohren aus Polyvinylchlorid zu schaffen, das das Auftreten der oben erwähnten Folgen der Spannungskorrosion verhindert bzw. wirksam herabsetzt.In contrast, the invention is based on the object of a method for treating pipes from polyvinyl chloride to prevent the occurrence of the above-mentioned effects of stress corrosion prevents or effectively reduces.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die extrudierten und abgekühlten Rohre während mindestens 15 Minuten einer Wärmebehandlung bei Temperaturen zwischen 80 und 160° C unterworfen und anschließend schnell auf eine Temperatur unter 60° C abgekühlt werden.This object is achieved according to the invention in that the extruded and cooled tubes for at least 15 minutes of heat treatment at temperatures between 80 and 160 ° C and then rapidly cooled to a temperature below 60 ° C.
In weiterer Ausgestaltung der Erfindung werden die Rohre schnell auf ungefähr 15 bis 20° C abgekühlt. In a further embodiment of the invention, the tubes are quickly cooled to approximately 15 to 20 ° C.
In einer noch weiteren Ausgestaltung der Erfindung werden die Rohre während der Wärmebehandlung für 15 Minuten bis eine Stunde auf 100° C gehalten. 6gIn a still further embodiment of the invention, the tubes are during the heat treatment held at 100 ° C for 15 minutes to an hour. 6g
Die wesentlichen Unterschiede des erfindungsgemäßen Verfahrens gegenüber dem letztgenannten, bekannten Verfahren bestehen — abgesehen davon, daß erfindungsgemäß Rohre aus Polyvinylchlorid behandelt werden, —'■ darin, daß die extrudierten Rohre zunächst einer Abkühlung, dann einer Wärmebehandlung und anschließend einer schnellen Abkühlung unterworfen werden.The main differences between the method according to the invention and the last-mentioned, known method consist - apart from the fact that pipes made of polyvinyl chloride are treated according to the invention - '■ that the extruded pipes are first subjected to a cooling, then a heat treatment and then a rapid cooling.
Durch die Abkühlung auf vorzugsweise ungefähr 15 bis 20° C werden eine schnelle Stabilisierung und hervorragende Werte hinsichtlich der Spannungskorrosion erreicht. The cooling to preferably about 15 to 20 ° C ensures rapid stabilization and achieved excellent values in terms of stress corrosion.
, Zur Erzielung optimaler Eigenschaften hinsichtlich der Benzolabsorption werden die Röhren bei dem erfindungsgemäßen Herstellungsverfahren vorzugsweise zwischen 15 Minuten bis eine Stunde auf 100° C gehalten. Eine länger als eine Stunde dauernde Wärmebehandlung auf 100° C verringert die Benzolabsorption nicht weiter, kann jedoch den Produktionsablauf nachteilig beeinflussen., To achieve optimal properties with regard to of the benzene absorption, the tubes are preferred in the manufacturing method according to the invention held at 100 ° C for between 15 minutes to an hour. One that lasts longer than an hour Heat treatment to 100 ° C does not reduce benzene absorption any further, but it can affect the production process adversely affect.
Mit Hilfe des erfindungsgemäßen Herstellungsverfahrens sinkt die Benzolabsorption von Rohren aus Polyvinylchlorid auf einen Wert unter 20 0Zo. Die Rohre zeigen einen beträchtlich größeren Widerstand gegen Spannungskorrosion und sind bei unveränderter Impact-(= Schlag- bzw. Stoß-)festigkeit gegen eine höhere Druckbelastung beständig.With the aid of the production process according to the invention, the benzene absorption of pipes made of polyvinyl chloride drops to a value below 20 0 zo. The pipes show a considerably greater resistance to stress corrosion and are resistant to higher pressure loads with unchanged impact resistance.
Einerseits führt das erfindüngsgemäße Verfahren zu optimalen Eigenschaften des Materials, normalerweise zu einer Benzolabsorption von weniger als 10 °/o. während andererseits die für die Herstellung der Röhren erforderlichen Einrichtungen nur in ökonomisch annehmbarer Weise zu vergrößern sind.On the one hand, the method according to the invention leads to optimal properties of the material, normally to a benzene absorption of less than 10%. while on the other hand those for manufacturing the facilities required for the tubes can only be enlarged in an economically acceptable manner.
Falls das erfindungsgemäße Verfahren diskontinuierlich durchgeführt wird, d. h., mit Rohrabschnitten, werden die Röhren in einem Behälter mit Wasser von 100° C oder einem anderen nicht aggresiven Lösungsmittel behandelt. Beim kontinuierlichen Verfahren werden die extrudierten Röhren mit einer vorgegebenen Geschwindigkeit durch einen Raum mit einer Temperatur von 70 bis 160° C, vorzugsweise 100° C, geführt. Die Geschwindigkeit wird derart gewählt, daß die Röhren mindestens 15 Minuten in diesem Raum verbleiben.If the process according to the invention is carried out batchwise, d. i.e., with pipe sections, the tubes are placed in a container with water at 100 ° C or another non-aggressive Solvent treated. In the continuous process, the extruded tubes with a predetermined Speed through a room with a temperature of 70 to 160 ° C, preferably 100 ° C. The speed is chosen so that the tubes run for at least 15 minutes remain in this room.
Bei Temperaturen bis 15° C kann als billiges Kühlmedium Wasser verwendet werden.At temperatures up to 15 ° C can be used as a cheap cooling medium Water can be used.
Claims (3)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL298140 | 1963-09-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE1504413A1 DE1504413A1 (en) | 1970-02-26 |
| DE1504413B2 true 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)
| 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 |
-
0
- NL NL298140D patent/NL298140A/xx unknown
-
1964
- 1964-09-11 BE BE652970D patent/BE652970A/xx unknown
- 1964-09-16 DK DK457364AA patent/DK118847B/en unknown
- 1964-09-17 AT AT799564A patent/AT292291B/en not_active IP Right Cessation
- 1964-09-18 GB GB38149/64A patent/GB1081935A/en not_active Expired
- 1964-09-19 DE DE19641504413 patent/DE1504413B2/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| NL298140A (en) | 1900-01-01 |
| DE1504413A1 (en) | 1970-02-26 |
| AT292291B (en) | 1971-08-25 |
| BE652970A (en) | 1964-12-31 |
| DK118847B (en) | 1970-10-12 |
| GB1081935A (en) | 1967-09-06 |
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