WO1995021051B1 - Process for producing corrugated multi-layer tubing having layers of differing plastic characteristics - Google Patents

Process for producing corrugated multi-layer tubing having layers of differing plastic characteristics

Info

Publication number
WO1995021051B1
WO1995021051B1 PCT/US1995/001565 US9501565W WO9521051B1 WO 1995021051 B1 WO1995021051 B1 WO 1995021051B1 US 9501565 W US9501565 W US 9501565W WO 9521051 B1 WO9521051 B1 WO 9521051B1
Authority
WO
WIPO (PCT)
Prior art keywords
tubular
tubular material
die
mold
outer diameter
Prior art date
Application number
PCT/US1995/001565
Other languages
French (fr)
Other versions
WO1995021051A1 (en
Filing date
Publication date
Priority claimed from US08/192,503 external-priority patent/US5460771A/en
Application filed filed Critical
Priority to EP95910199A priority Critical patent/EP0743894B1/en
Priority to JP7520815A priority patent/JP2875395B2/en
Priority to AT95910199T priority patent/ATE188902T1/en
Priority to BR9506743A priority patent/BR9506743A/en
Priority to DE69514645T priority patent/DE69514645T2/en
Publication of WO1995021051A1 publication Critical patent/WO1995021051A1/en
Publication of WO1995021051B1 publication Critical patent/WO1995021051B1/en

Links

Abstract

A method for producing polymeric tubing (20) which is resistant to permeation by organic material contained therein which has at least one region defined by a plurality of outwardly extending annular ridges. In this method polymeric material having a first outer diameter and composed of at least three overlying polymeric layers is introduced into a mold device upon exit of the tubular polymeric material from a suitable extrusion device. The mold surface of the mold device has at least one region defined by an annular depression (28) in an essentially cylindrical surface. Once the tubular material (20) is intruduced, it is expanded to a second outer diameter such that the tubular material (20) deformably contacts the mold surface. The corrugated tubular material then exist the mold device after completion of the expansion step.

Claims

AMENDED CLAIMS
[received by the International Bureau on 11 August 1995 (11.08.95); original claims 1, 9, 11, 14, 16, 17 and 19 amended; remainin g claims unchanged (8 pages)]
1. A method for producing fuel and vapor tubing having at least one region defined by a plurality of outwardly extending annular ridges, the method comprising the steps of: extruding tubular polymeric material from one extrusion head, said tubular polymeric material having at least three concentric layers of thermoplastic material in overlying bonded relationship to one another, wherein at least two concentric layers are composed of thermoplastic materials having different chemical compositions, said extruded multi-layer tubular polymeric material having an outer diameter, and inner surface and an opposed exterior surface; introducing said extruded multi-layer tubular polymeric material into a mold device upon exit of said tubular material from said extrusion head, said mold device comprising means for continuously forming said tubular material introduced therein, said continuous forming means comprising a die unit defining an essentially cylindrical channel mold surface, having a first mold surface inner diameter greater than said first outer diameter of said introduced tubular polymeric material and at least one annular depression positioned therein, said annular depression having a maximum second inner diameter greater than said first inner diameter; expanding said tubular polymeric material to a second outer diameter such that said exterior surface of said tubular material deformably contacts said inner mold surface of said die unit; and permitting said tubular material to exit from said die unit after said expansion step.
2. The method of claim 1 wherein said expansion step comprises drawing a vacuum on said exterior surface of said tubular material during residence of said tubular material in said die unit, said 44 said tubular material in an amount between about 40% and about 60% of said first cross-sectional diameter.
9. The process of claim 1 further comprises longitudinally drawing said tubular material to accomplish elongation of said tubular material to an amount between about 10% and about 20% greater than said initially extruded tubular material.
10. The process of claim 1 further comprising the step of separating molded multi-layer tubing into measured lengths.
11. The process of claim 1 wherein said means for continuously forming said tubular material introduced therein comprises: a plurality of segmented die sets, said die set each comprising: a) a first member having a first end, an second end opposed to said first end, an upper face disposed between said first end and said second end and a mold surface disposed in and contiguous to said upper face; and b) a second member having a first end, an second end opposed to said first end, an upper face disposed between said first end and said second end and a mold surface disposed in and contiguous to said upper face; wherein said upper face of said first member and said face of said second member are matingly engageable and define an essentially cylindrical shaft when said first member and said second member are placed in mating engagement; means for maintaining said members of said die sets in end-to-end engagement with one another such that said first end of one member of said die set engages the second end of a contiguous die set; 45 means for rotatably moving said first and second members of said die sets relative to one another such that said respective first and second members are matably engaged to define said cylindrical molding channel for an interval during said rotational movement and experience lateral movement during said interval of engagement.
12. The process of claim 11 wherein at least one die set has at least one annular depression located in said essentially cylindrical shaft defined by said first and second members, said annular depression having a second inner diameter greater than said inner diameter of the cylindrical region of said cylindrical shaft.
13. The process of claim 12 further comprising the steps of: allowing said tubular material to be drawn away from said injection nozzle at a rate essentially equal to said rate of travel of said dies; and sequentially opening said die sets to permit said tubular material to exit therefrom after said tubular material has expanded and deformably contracted said inner surface of said cylindrical channel.
14. The method of claim 13 wherein said expansion step comprises drawing a vacuum on said exterior surface of said multi-layer tubular material during residence of said tubular material in said die unit, said vacuum drawing said exterior surface of said tubular material into contact with said inner surface of said die unit and deforming said inner surface of said tubular material to correspond to contours in the inner surface of said die unit.
15. The method of claim 14 wherein the vacuum pressure is between about 10 and about 20 inches Hg. 16. The method of claim 14 wherein said expansion step comprises exerting gaseous pressure on
4 7
said inner surface of said co-extruded tubular material forcing said exterior surface of said tubular material into contact with said inner surface of said die unit.
17. The method of claim 13 wherein said expansion step comprises exerting gaseous pressure on said inner surface of said co-extruded tubular material forcing said exterior surface of said tubular material into contact with said inner surface of said die unit.
18. The method of claim 13 wherein said multi- layer tubular material is introduced into contact with said mold means in a molten state in which between about 10% and about 20% of said thermoplastic material has solidified.
19. A method for producing fuel and vapor tubing having at least one region defined by at least one corrugated region, the method comprising the steps of: extruding tubular polymeric material from one extrusion head, said tubular polymeric material having at least three concentric layers of thermoplastic material in overlaying bonded relationship to one another, wherein at least two concentric layers are composed of thermoplastic materials having different chemical compositions, said extruded multi-layer tubular polymeric material having a first outer diameter, an inner surface and an exposed exterior surface; introducing said extruded multi-layer tubular thermoplastic material into a mold device while still in a molten state upon exit of the said thermoplastic material from said extrusion head, said mold device comprising: a) a plurality of segmented die sets, each die set having a first end, a second end, and an essentially cylindrical shaft extending from said first end to said second end of said die set, said cylindrical shaft defining an inner surface having a first inner diameter greater than said first outer diameter of said introduced multi-layer tubular thermo-plastic material wherein at least one of said die sets has at least one annular depression having a second inner diameter greater than said first inner diameter; b) means for sequentially positioning said die sets in an end-to-end fashion such that said first end of an initial die set engages said second end of a subsequent die set at said point said molten tubular material is introduced into said mold device;
4 9 c) means for moving said die sets laterally away from said extrusion head at a uniform rate of travel; and d) means for permitting removal of said tubular material from said die sets at a point distal from said extrusion head; drawing said tubular material away from said extrusion head at a rate essentially equal to movement of said die sets, said drawing step sufficient to effect elongation of said tubular material by an amount between about 10% and about 20% greater elongation of said tubular material as initially extruded; expanding said tubular material from said first outer diameter to a second outer tubular diameter sufficient to permit deformable contact between said exterior surface of said tubular material and said inner surface of said essentially cylindrical shaft of said segmented dies, wherein said second outer diameter is between about of 40% and about 60% greater than said first outer diameter; and sequentially opening said segmented dies to permit said tubular material to exit therefrom, said tubular material having said second tubular outer diameter and convolutions essentially equivalent to said annular depression located in at least one die set, wherein said multi-layer tubing material comprises an exterior layer composed of an extrudable melt processible thermoplastic and at least one inner layer is a fluoroplastic material selected from the group consisting of polyvinylidine fluoride, polyvinyl fluoride, ethylene tetrafluoroethylene and mixtures thereof.
20. The method of claim 19 wherein said expansion step comprises drawing a vacuum on said exterior surface of said tubular material during residence of said tubular material in said mold means. said vacuum drawing said tubular material into contact with said inner surface of said segmented dies.
PCT/US1995/001565 1994-02-07 1995-02-07 Process for producing corrugated multi-layer tubing having layers of differing plastic characteristics WO1995021051A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP95910199A EP0743894B1 (en) 1994-02-07 1995-02-07 Process for producing corrugated multi-layer tubing having layers of differing plastic characteristics
JP7520815A JP2875395B2 (en) 1994-02-07 1995-02-07 Method of manufacturing a corrugated multilayer tube with layers of different plastic properties
AT95910199T ATE188902T1 (en) 1994-02-07 1995-02-07 PROCESS FOR PRODUCING CORRUPTED MULTI-LAYER PIPES
BR9506743A BR9506743A (en) 1994-02-07 1995-02-07 Process for producing fuel and steam piping having at least one region defined by a plurality of annular recesses extending from the inside to the outside
DE69514645T DE69514645T2 (en) 1994-02-07 1995-02-07 PROCESS FOR THE PRODUCTION OF CORRUGATED MULTI-LAYER TUBES

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/192,503 1994-02-07
US08/192,503 US5460771A (en) 1992-10-16 1994-02-07 Process for producing corrugated multi-layer tubing having layers of differing plastic characteristics

Publications (2)

Publication Number Publication Date
WO1995021051A1 WO1995021051A1 (en) 1995-08-10
WO1995021051B1 true WO1995021051B1 (en) 1995-09-08

Family

ID=22709940

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/001565 WO1995021051A1 (en) 1994-02-07 1995-02-07 Process for producing corrugated multi-layer tubing having layers of differing plastic characteristics

Country Status (9)

Country Link
US (1) US5460771A (en)
EP (1) EP0743894B1 (en)
JP (1) JP2875395B2 (en)
AT (1) ATE188902T1 (en)
BR (1) BR9506743A (en)
DE (1) DE69514645T2 (en)
ES (1) ES2140663T3 (en)
PT (1) PT743894E (en)
WO (1) WO1995021051A1 (en)

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