US3871807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for forming tubes of thermoplastic material by extrusion
Assignee: Pont a Mousson SA
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Filing: 1973-01-03
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Granted: 1975-03-18
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Expires: 1993-01-03
Abstract
Abstract The device is adapted to be disposed at the output end of an extruder and comprises a cold die head having an annular chamber formed in the case of the head and surrounding an axial cylindrical extrusion passage. The dimension of the chamber axially of the passage is substantially less than the diameter of the passage. Cooling fluid is fed to the chamber and fluid under pressure is fed to the passage.
Inventors
- 👤 Jean-Pierre Meyniel
- 👤 Jean-Louis Roulle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:35
CPC Classifications
B; B29; B29D; B29D23/00; B29D23/20; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/25; B29C48/88; B29C48/90; B29C48/901; B29C48/903; B29C48/885; B29C48/908; B29C48/911; B29C48/9115; B29C48/912; B29C48/919; B29L; B29L2023/00; B29L2023/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
287 words
A device for forming tubes of thermoplastic material comprising a cooling tank for containing a bath of cooling liquid; a cold die head comprising tubular means having an upstream end and defining a throughway passage, second means defining with said tubular means an annular chamber surrounding a portion of said tubular means adjacent said upstream end, said tubular means being combined with a wall of said tank adjacent said upstream end and putting the interior of said tank in communication with the exterior of said tank, said upstream end of said tubular means being for combination with an annular output end of an extruder so as to put said passage in axial alignment with said extruder annular output end for receiving the tubular extruded material from said extruder, said second means having a downstream end remote from said upstream end of said tubular means and said tubular means having a part extending beyond said downstream end of said second means so that said part of said tubular means is directly exposed to said bath of cooling liquid, said passage being for communication with a source of fluid under pressure for applying the tubular extruded material against said tubular means, means for putting said chamber in communication with a source of cooling liquid and means for discharging cooling liquid from said chamber so as to cool said extruded material indirectly through said portion of said tubular means; and means for supplying a cooling liquid in jet form to said bath of cooling liquid around said part of said tubular means in a region adjacent said downstream end of said second means for creating a turbulence in said bath of cooling liquid around said part of said tubular means.
Claim 2
Independent Claim
287 words
A device for forming tubes of thermoplastic material comprising a cooling tank for containing a bath of cooling liquid; a cold die head comprising tubular means having an upstream end and defining a throughway passage, second means defining with said tubular means an annular chamber surrounding a portion of said tubular means adjacent said upstream end, said tubular means being combined with a wall of said tank adjacent said upstream end and putting the interior of said tank in communication with the exterior of said tank, said upstream end of said tubular means being for combination with an annular output end of an extruder so as to put said passage in axial alignment with said extruder annular output end for receiving the tubular extruded material from said extruder, said second means having a downstream end remote from said upstream end of said tubular means and said tubular means having a part extending beyond said downstream end of said second means so that said part of said tubular means is directly exposed to said bath of cooling liquid, said passage being for communication with a source of fluid under pressure for applying the tubular extruded material against said tubular means, means for putting said chamber in communication with a source of cooling liquid and means for discharging cooling liquid from said chamber so as to cool said extruded material indirectly through said portion of said tubular means; and means for supplying a cooling liquid in jet form to said bath of cooling liquid around said part of said tubular means in a region adjacent said downstream end of said second means for creating a turbulence in said bath of cooling liquid around said part of said tubular means.
Claim 3
Independent Claim
332 words
A device for forming tubes of thermoplastic material comprising a cooling tank for containing a bath of cooling liquid, a cold die head comprising tubular means having an upstream end and a downstream end and defining a cylindrical throughway passage, second means defining with said tubular means an annular chamber surrounding a portion of said tubular means adjacent said upstream end, said tubular means being combined with a wall of said tank adjacent said upstream end and putting the interior of said tank in communication with the exterior of said tank, said upstream end of said tubular means being for combination with an annular output end of an extruder so as to put said passage in axial alignment with said extruder annular output end for receiving the tubular extruded material from said extruder, said second means having a downstream end remote from said upstream end of said tubular means anD said tubular means having a part extending beyond said downstream end of said second means so that said part of said tubular means is directly exposed to said bath of cooling liquid, said passage being for communication with a source of fluid under pressure for applying the tubular extended material against said tubular means, means for putting said chamber in communication with a source of cooling liquid so as to cool said extruded material indirectly through said portion of said tubular means, means defining a series of equally-spaced orifices disposes around and adjacent said tubular means and adjacent said downstream end of said second means for putting said chamber in communication with the interior of said tank and producing jets of said cooling fluid which issue from said chamber and create turbulence in said bath of cooling liquid around said part of said tubular means, said chamber having a length axially of said tubular means which length is a minor fraction of the diameter of said passage and a minor fraction of the axial length of said part of said tubular means.
Claim 4
Independent Claim
332 words
A device for forming tubes of thermoplastic material comprising a cooling tank for containing a bath of cooling liquid, a cold die head comprising tubular means having an upstream end and a downstream end and defining a cylindrical throughway passage, second means defining with said tubular means an annular chamber surrounding a portion of said tubular means adjacent said upstream end, said tubular means being combined with a wall of said tank adjacent said upstream end and putting the interior of said tank in communication with the exterior of said tank, said upstream end of said tubular means being for combination with an annular output end of an extruder so as to put said passage in axial alignment with said extruder annular output end for receiving the tubular extruded material from said extruder, said second means having a downstream end remote from said upstream end of said tubular means anD said tubular means having a part extending beyond said downstream end of said second means so that said part of said tubular means is directly exposed to said bath of cooling liquid, said passage being for communication with a source of fluid under pressure for applying the tubular extended material against said tubular means, means for putting said chamber in communication with a source of cooling liquid so as to cool said extruded material indirectly through said portion of said tubular means, means defining a series of equally-spaced orifices disposes around and adjacent said tubular means and adjacent said downstream end of said second means for putting said chamber in communication with the interior of said tank and producing jets of said cooling fluid which issue from said chamber and create turbulence in said bath of cooling liquid around said part of said tubular means, said chamber having a length axially of said tubular means which length is a minor fraction of the diameter of said passage and a minor fraction of the axial length of said part of said tubular means.
Claim 5
Dependent Claim
32 words
A device as claimed in claim 2, wherein said hot die head includes a mandrel having a passageway for putting said cylindrical passage in communication with said source of fluid under pressure.
Claim 6
Dependent Claim
73 words
A device as claimed in claim 2, wherein said second means is in the form of an annular housing and said annular chamber is defined by a cavity in the housing, which housing has a cylindrical axial opening communicating with said cavity, and by said tubular means which is in the form of a cylindrical sleeve which is disposed in said cylindrical axial opening and has an inner surface defining said cylindrical passage.
Claim 7
Dependent Claim
41 words
A device as claimed in claim 2, further comprising a hot die head disposed upstream of the cold die head with respect to the travel of the thermoplastic material, said cold die head being substantially insulated from the hot die head.
Claim 8
Dependent Claim
51 words
A device as claimed in claim 5, wherein said second means is in the form of an annular housing which has projections having a very small section with respect to the diameter of the cylindrical passage, the annular housing being adapted to bear against the hot die head through said projections.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |