WO1995025628A1 - Method and device for manufacturing biaxially oriented tubing from thermoplastic material - Google Patents
Method and device for manufacturing biaxially oriented tubing from thermoplastic material Download PDFInfo
- Publication number
- WO1995025628A1 WO1995025628A1 PCT/NL1995/000099 NL9500099W WO9525628A1 WO 1995025628 A1 WO1995025628 A1 WO 1995025628A1 NL 9500099 W NL9500099 W NL 9500099W WO 9525628 A1 WO9525628 A1 WO 9525628A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tube
- mandrel
- calibration
- external dimensions
- downstream
- Prior art date
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
- 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
- B29C55/26—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes biaxial
-
- 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/30—Drawing through a die
-
- 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
Definitions
- the present invention relates to a method for manufacturing biaxially oriented tubing from thermoplastic material, comprising forcing the tube over a mandrel at an orientation temperature of the plastic material, which mandrel comprises an expansion part which produces expansion in the circumferential direction of the tube, while downstream of the mandrel an axial pulling force is exerted on the tube, and the biaxially oriented tube is cooled down, and downstream of the mandrel the tube is subjected to calibration of its external dimensions.
- the term tube also relates to hose-type products.
- the present invention also relates to a device for carrying out the method according to the invention.
- the object of biaxially orienting the plastic material of a tube is to improve the properties of the tube through orientation of the molecules of the plastic material of the tube in two mutually perpendicular directions.
- the biaxial orientation is produced by forcing the tube over a mandrel, with the result that the tube is deformed. Upstream of the mandrel the tube is brought to a suitable orientation temperature.
- the temperature distribution inside the tube wall is within a suitable range for biaxial orientation of the molecules of the plastic material of the tube.
- the tube is forced over the mandrel through an axial pulling force being exerted on the tube downstream of the mandrel.
- the mandrel comprises an expansion part which produces the increase in the dimensions in the circumferential direction of the tube.
- the fact that the tube passes over this expansion part essentially determines the orientation of the plastic material in the circumferential direction of the tube.
- the axial pulling force essentially determines the orientation in the axial direction.
- the biaxial orientation obtained is fixed (frozen) by cooling down the tube.
- a method of the type mentioned in the preamble is known from, for example, WO 93/19924. This publication describes how a tube with a cylindrical tube wall is manufactured by means of an extruder.
- a solid, undeformable mandrel with a conical expansion part is situated down ⁇ stream of said extruder.
- the tube is forced over the mandrel at an orientation temperature which is suitable for the plastic material concerned, through an axial pulling force being exerted on the tube downstream of the mandrel.
- the tube is cooled externally in order to fix the orientation obtained.
- this publication proposes that a vacuum calibration sleeve should be placed downstream of the mandrel, between the mandrel and the pulling device.
- the tube is pulled through this calibration sleeve, in the course of which the tube is sucked against the inside wall of the calibration sleeve by means of a vacuum created by a vacuum source.
- the result of this is that the tube is stretched here in the circumferential direction until it reaches an external diameter determined by the inside wall of the calibration sleeve.
- the tube has to be heated in the case of this known method.
- the heating is carried out by heating the calibration sleeve.
- the method of calibration of the external dimen ⁇ sions of the biaxially oriented tube proposed in the case of this known method has proved disadvantageous.
- it has been found that the biaxial orientation of the plastic material of the tube produced during the passage over the mandrel is impaired in an undesirable way, both through increasing the external dimensions of the tube during calibration and through heating applied to the tube during the calibration.
- the object of the present invention is to eliminate the abovementioned disadvantage and also to provide a method which comprises accurate regulation for the external dimensions of the tube.
- This object is achieved by a method of the type described in the preamble, which is characterized in that the calibration of the external dimensions of the tube is achieved through a reduction in the external dimensions of the tube.
- the tube will shrink downstream of the mandrel through cooling, in particular produced by cooling means set up at that point. This shrinkage occurs both in the case of the method according to the present invention and in the case of the methods already known.
- the reduction In order to produce the effective reduction in the external dimensions of the tube envisaged according to the present invention, the reduction must therefore lead to smaller external dimensions than the external dimensions which the tube would acquire if allowance is made for the shrinkage which occurs.
- the tube is drawn through a calibration opening bounded by calibration means, the calibration opening being such that it produces a reduction in the external dimensions of the tube.
- the calibration means can be in the form of, for example, a solid draw plate with a calibration opening formed therein or a number of rollers which together bound the calibration opening.
- the calibration means produce a reduction in the external dimensions of the tube. Since a reduction in the external dimensions now occurs, it is not necessary for the tube and/or the calibration means to be heated, which is advantageous for achieving the envisaged biaxial orientation.
- the cross-section of the tube undergoes a progressive reduction between the mandrel and the cali ⁇ bration opening.
- the way in which said reduction occurs here, in particular the speed at which it occurs, can advantageously be used for controlling the biaxial drawing process, as will emerge from the sub-claims and the corresponding description.
- the tube also encounters a resistance at the moment when it is passing through the calibration means. This resistance can also advantageously be used for controlling the biaxial drawing process.
- EP 0157601 discloses a method of the type mentioned in the preamble in which, downstream of the expansion part of the mandrel, the tube to be oriented is drawn through a draw plate lying around a cylindrical run-off part of the mandrel. It is clear that this draw plate does not serve as a calibration means for the external dimensions of the tube after the tube has left the mandrel, as in the case of the present invention. On the contrary, EP 0157601 discloses an interaction between the draw plate and the part of the mandrel lying inside it for producing the biaxial orientation of the plastic material of the tube.
- the distance between the mandrel and the calibration opening is regulated.
- the calibration means it is, of course, necessary for the calibration means to be movable relative to the mandrel, which is simple to carry out.
- the distance between the mandrel and the calibra ⁇ tion opening is preferably regulated depending on charac ⁇ teristics measured downstream of the calibration opening, in particular the external dimensions of the biaxially oriented tube.
- the distance between the mandrel and the calibra ⁇ tion opening is advantageously increased if the measured external dimensions of the biaxially oriented tube are smaller than the desired external dimensions, and the distance between the mandrel and the calibration opening is reduced if the measured external dimensions of the biaxially oriented tube are greater than the desired external dimensions.
- the calibration means are cooled.
- the tube is also preferably cooled further when it is downstream of the calibration means.
- the influence of the shrinkage of the tube caused by this cooling on the external dimensions of the tube can be determined (for example, experimentally) and used in determining or adjust ⁇ ing the dimensions of the calibration opening, which are necessary to obtain the desired external dimensions of the tube.
- the tube downstream of the mandrel the tube is drawn through several calibration openings placed one after the other and bounded by calibration means, each calibration opening being such that it produces a further reduction in the external dimensions of the tube.
- each calibration opening being such that it produces a further reduction in the external dimensions of the tube.
- the drawing shows a part of a tube 1 (in longi ⁇ tudinal section) made of thermoplastic material, which tube is manufactured in a continuous process by means of an extruder (not shown) . Downstream of the extruder the plastic material of the tube 1 is brought by means of tem ⁇ perature-regulating means (not shown) to a temperature suitable for biaxial orientation, for example cooling by air or water.
- the plastic material of the tempered tube 1 is biaxially oriented (drawn) by subsequently forcing the tube 1 over a metal mandrel 3 fixed by a tension member 2 to the extruder.
- the mandrel 3 has a cylindrical run-on part 4, a conical expansion part 5 and a slightly tapered run-off part 6.
- a pulling device (not shown) is present downstream of the mandrel 3, for exerting an axial pulling force on the tube 1.
- a pushing device may also be placed upstream of the mandrel 3, for exerting a pushing force on the tube 1.
- a diagrammatically indicated cooling device 8 is set up at this point, for example with spray nozzles for cooling water.
- the calibration and cooling device 10 comprises a draw plate 11, in the form of a metal disc with a central calibration opening 12.
- the draw plate 11 is slidably mounted on guide bars 13 of the fixed frame of the calibration device 10, in such a way that the distance between the draw plate 11 and the mandrel 3 can be set within a suitable range.
- the calibration device 10 comprises a diagrammatically indicated displacement unit 14 for moving the draw plate 11. Arms 15 with cooling medium spray nozzles 16 are fixed to the draw plate 11, for cooling the biaxially oriented tube 1 during and after its passage through the draw plate 11.
- the cooling medium for example water, is supplied through a pipe 17 to the spray nozzles 16.
- the cooling medium is collected in a tank 18 placed around the calibration and cooling device 10.
- the diameter of the calibration opening 12 of the draw plate 11 is selected in such a way that the external diameter of the tube 1 is reduced when it is passing through the draw plate 11.
- the reduction which the draw plate 11 produces in the external diameter relative to the external diameter of the tube 1 at the moment of leaving the mandrel 3 is greater than the reduction in the external diameter of the tube 1 resulting from the shrinkage through cooling of the tube in the path between the mandrel 3 and the calibration opening 12.
- the draw plate 11 exerts an effective force on the tube 1, thereby reducing the external diameter of the tube 1.
- the diameter of said calibration opening 12 can be selected in such a way that the ultimately manufactured tube 1 acquires the envisaged external diameter with great accuracy.
- the present invention provides a solution to effectively controlling the external diameter of the biaxial oriented tube 1.
- a diagrammatically shown measuring device 20 is placed downstream of the calibration device 10. This measuring device 20 measures the external dimensions, in this case the external diameter, of the tube 1.
- the measuring device 20 transmits a signal representing the external dimensions to a control unit 21, which compares this signal with a signal representing the desired external dimensions of the tube 1.
- a control signal based on the difference between these two signals is supplied by the control unit 21 to the displacement unit 14 of the calibration device 10. This produces the movement of the draw plate 11 relative to the mandrel 3.
- control unit 21 If it is found by the control unit 21 that the external diameter of the tube is smaller than the desired external diameter, the control unit 21 transmits such a signal to the displacement unit 14 that the distance between the mandrel 3 and the draw plate 11 increases. However, if the external diameter of the tube 1 is greater than the desired external diameter, the draw plate 11 is moved towards the mandrel 3.
- the basic principle of this method can be explained by the speed at which the cross-section of the tube is reduced. This speed depends on the distance between mandrel 3 and draw plate 11. If the speed of reduction of the cross-section is relatively great, the ultimate diameter reduction is found to be greater than that at a lower speed (a great distance between the mandrel and the draw plate) .
- the resistance formed by the draw plate 11 to the tube 1 passing through it can also be used advantageously for the biaxial orientation to be achieved. Although this orientation occurs essentially when the tube 1 is passing over the mandrel 3, it is found that the axial tension in the tube 1 in the path after it has passed through the draw plate 11 has an influence on the ultimately manufactured tube 1.
- the cooling of the tube can be regu ⁇ lated suitably by means of the cooling device 8 so that the biaxially oriented tube 1 is cooled in the path between the mandrel 3 and the draw plate 11. This then leads to an increase in the resistance formed by the draw plate 11 to the tube 1 passing through it.
- This method of changing the axial tension in the tube 1 can advantageously be used for obtaining the envisaged biaxial orientation.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
Description
Claims
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK95912497T DK0751862T3 (en) | 1994-03-22 | 1995-03-17 | Method and apparatus for producing biaxially oriented tubes of thermoplastic material |
DE69505507T DE69505507T2 (en) | 1994-03-22 | 1995-03-17 | METHOD AND DEVICE FOR PRODUCING A BIAXIALLY ORIENTED TUBE FROM THERMOPLASTIC PLASTIC |
RU96119212A RU2135361C1 (en) | 1994-03-22 | 1995-03-17 | Process and device to manufacture pipe-line from thermoplastic material oriented biaxially |
US08/716,406 US5785906A (en) | 1994-03-22 | 1995-03-17 | Method and device for manufacturing biaxially oriented tubing from thermoplastic material |
EP95912497A EP0751862B1 (en) | 1994-03-22 | 1995-03-17 | Method and device for manufacturing biaxially oriented tubing from thermoplastic material |
AU19621/95A AU690236B2 (en) | 1994-03-22 | 1995-03-17 | Method and device for manufacturing biaxially oriented tubing from thermoplastic material |
PL95316237A PL176415B1 (en) | 1994-03-22 | 1995-03-17 | Method of and apparatus for making a biaxially oriented plastic tube |
CA002185701A CA2185701C (en) | 1994-03-22 | 1995-03-17 | Method and device for manufacturing biaxially oriented tubing from thermoplastic material |
BR9507153A BR9507153A (en) | 1994-03-22 | 1995-03-17 | Process and device for manufacturing biaxially oriented piping from thermoplastic material |
FI963738A FI114145B (en) | 1994-03-22 | 1996-09-20 | Process for manufacturing a biaxially oriented tube |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL9400452 | 1994-03-22 | ||
NL9400452A NL9400452A (en) | 1994-03-22 | 1994-03-22 | Method and device for manufacturing biaxially oriented tube from thermoplastic plastic material. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995025628A1 true WO1995025628A1 (en) | 1995-09-28 |
Family
ID=19863976
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NL1995/000099 WO1995025628A1 (en) | 1994-03-22 | 1995-03-17 | Method and device for manufacturing biaxially oriented tubing from thermoplastic material |
Country Status (14)
Country | Link |
---|---|
US (1) | US5785906A (en) |
EP (1) | EP0751862B1 (en) |
AT (1) | ATE172404T1 (en) |
AU (1) | AU690236B2 (en) |
BR (1) | BR9507153A (en) |
CZ (1) | CZ285719B6 (en) |
DE (1) | DE69505507T2 (en) |
DK (1) | DK0751862T3 (en) |
ES (1) | ES2125008T3 (en) |
FI (1) | FI114145B (en) |
NL (1) | NL9400452A (en) |
PL (1) | PL176415B1 (en) |
RU (1) | RU2135361C1 (en) |
WO (1) | WO1995025628A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997006940A1 (en) * | 1995-08-18 | 1997-02-27 | Vinidex Tubemakers Pty. Limited | Control method for the manufacture of oriented plastics tubes |
WO1998009796A1 (en) * | 1996-09-02 | 1998-03-12 | Koninklijke Emballage Industrie Van Leer N.V. | Container of stretched plastic material, and process for making such container |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL9400738A (en) * | 1994-05-04 | 1995-12-01 | Wavin Bv | Method and device for manufacturing biaxially oriented tube from thermoplastic plastic material. |
GB0608775D0 (en) * | 2006-05-04 | 2006-06-14 | Caldervale Technology Ltd | Device for preparing pipe ends for jointing |
US20090174219A1 (en) * | 2008-01-04 | 2009-07-09 | Foreman Grant G | Vehicle energy absorber structure and method |
WO2016033726A1 (en) * | 2014-09-01 | 2016-03-10 | 浙江理工大学 | Bidirectionally-stretching apparatus and method for polytetrafluoroethylene hollow fiber membrane |
EP3573810B1 (en) * | 2017-01-26 | 2021-06-30 | SABIC Global Technologies B.V. | Process for producing pipe by biaxial elongation |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4028037A (en) * | 1975-03-17 | 1977-06-07 | The Dow Chemical Company | Tube treating and apparatus therefor |
EP0087036A1 (en) * | 1982-02-20 | 1983-08-31 | Hüls Aktiengesellschaft | Process for producing exactly sized fuel feed tubes of aliphatic polyamides |
AT384777B (en) * | 1984-03-27 | 1988-01-11 | Kutschi Franz Ing | METHOD AND DEVICE FOR THE CONTINUOUS PRODUCTION OF FIBER REINFORCED PLASTIC PIPES |
EP0441142A2 (en) * | 1990-02-07 | 1991-08-14 | Petzetakis, George Aristovoulos | Functioning method of an installation for manufacturing biaxially stretched plastic tubes |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE384777C (en) * | 1923-11-09 | Siemens Elektrowaerme Ges M B | Electric steam generating system | |
US2423260A (en) * | 1944-12-29 | 1947-07-01 | Extruded Plasties Inc | Extrusion of tubing |
NL301299A (en) * | 1962-12-07 | 1900-01-01 | ||
US4020136A (en) * | 1969-04-12 | 1977-04-26 | Giosue Zaro | Method and apparatus for the sizing of tubular bodies of a thermoplastic material which are continuously extruded |
DE2147876C3 (en) * | 1970-09-29 | 1975-04-24 | Tokan Kogyo Co. Ltd., Tokio | Method and device for manufacturing hollow sheet products from thermoplastic synthetic resin |
DE2210657C3 (en) * | 1972-03-06 | 1984-05-17 | Plastic-Werk A. U. G. Scherer & Trier Ohg, 8626 Michelau | Method and device for calibrating the extrusion of hollow profiles made of thermoplastic material |
US4314958A (en) * | 1980-07-22 | 1982-02-09 | Phillips Petroleum Company | Plastic pipe extrusion |
FI86158C (en) * | 1989-09-22 | 1992-07-27 | Jrt Finland Oy | KALIBRERINGSVERKTYG. |
-
1994
- 1994-03-22 NL NL9400452A patent/NL9400452A/en not_active Application Discontinuation
-
1995
- 1995-03-17 BR BR9507153A patent/BR9507153A/en not_active IP Right Cessation
- 1995-03-17 WO PCT/NL1995/000099 patent/WO1995025628A1/en active IP Right Grant
- 1995-03-17 DE DE69505507T patent/DE69505507T2/en not_active Expired - Lifetime
- 1995-03-17 CZ CZ962682A patent/CZ285719B6/en not_active IP Right Cessation
- 1995-03-17 RU RU96119212A patent/RU2135361C1/en not_active IP Right Cessation
- 1995-03-17 PL PL95316237A patent/PL176415B1/en not_active IP Right Cessation
- 1995-03-17 ES ES95912497T patent/ES2125008T3/en not_active Expired - Lifetime
- 1995-03-17 AT AT95912497T patent/ATE172404T1/en not_active IP Right Cessation
- 1995-03-17 DK DK95912497T patent/DK0751862T3/en active
- 1995-03-17 EP EP95912497A patent/EP0751862B1/en not_active Expired - Lifetime
- 1995-03-17 US US08/716,406 patent/US5785906A/en not_active Expired - Lifetime
- 1995-03-17 AU AU19621/95A patent/AU690236B2/en not_active Expired
-
1996
- 1996-09-20 FI FI963738A patent/FI114145B/en active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4028037A (en) * | 1975-03-17 | 1977-06-07 | The Dow Chemical Company | Tube treating and apparatus therefor |
EP0087036A1 (en) * | 1982-02-20 | 1983-08-31 | Hüls Aktiengesellschaft | Process for producing exactly sized fuel feed tubes of aliphatic polyamides |
AT384777B (en) * | 1984-03-27 | 1988-01-11 | Kutschi Franz Ing | METHOD AND DEVICE FOR THE CONTINUOUS PRODUCTION OF FIBER REINFORCED PLASTIC PIPES |
EP0441142A2 (en) * | 1990-02-07 | 1991-08-14 | Petzetakis, George Aristovoulos | Functioning method of an installation for manufacturing biaxially stretched plastic tubes |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997006940A1 (en) * | 1995-08-18 | 1997-02-27 | Vinidex Tubemakers Pty. Limited | Control method for the manufacture of oriented plastics tubes |
CN1064587C (en) * | 1995-08-18 | 2001-04-18 | 温尼德斯制管商有限公司 | Control method for manufacture of oriented plastics tubes |
WO1998009796A1 (en) * | 1996-09-02 | 1998-03-12 | Koninklijke Emballage Industrie Van Leer N.V. | Container of stretched plastic material, and process for making such container |
Also Published As
Publication number | Publication date |
---|---|
DE69505507T2 (en) | 1999-04-22 |
FI963738A (en) | 1996-09-20 |
EP0751862A1 (en) | 1997-01-08 |
EP0751862B1 (en) | 1998-10-21 |
RU2135361C1 (en) | 1999-08-27 |
PL176415B1 (en) | 1999-05-31 |
AU1962195A (en) | 1995-10-09 |
NL9400452A (en) | 1995-11-01 |
ATE172404T1 (en) | 1998-11-15 |
FI114145B (en) | 2004-08-31 |
DK0751862T3 (en) | 1999-06-28 |
ES2125008T3 (en) | 1999-02-16 |
FI963738A0 (en) | 1996-09-20 |
BR9507153A (en) | 1997-09-02 |
CZ285719B6 (en) | 1999-10-13 |
PL316237A1 (en) | 1997-01-06 |
AU690236B2 (en) | 1998-04-23 |
DE69505507D1 (en) | 1998-11-26 |
US5785906A (en) | 1998-07-28 |
CZ268296A3 (en) | 1997-03-12 |
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