Patent EP0119029A2 successfully refreshed from Google Patents.
EP0119029A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Vented screw pump for thermoplastic polymers
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1984-02-24
•
Granted: —
•
Expires: 2004-02-24
Abstract
Abstract An improved vented screw pump and process are provided for venting and pumping molten thermoplastic polymers such as nylon 6,6 by which the extent of polymer degradation and gel formation is greatly reduced. The vented screw pump is characterised by the combination of an annular channel (13,14) through which molten polymer is fed into a vent chamber (6) and whereby the molten polymer is caused to flow as an annular film down the wall of the vent chamber and a screw (2) located below the vent chamber, the vent chamber (6) being provided with wiper (15) to wipe the molten polymer from the wall of the vent chamber (6). Preferably the screw (2) is operated in a vertical position, is driven from its lower end and has the wiper (15) mounted on its upper end.
Inventors
- 👤 André Lafeber
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 09:47
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/76; B29C48/375; B29C48/38; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92085; B29C2948/92104; B29C2948/92114; B29C2948/92161; B29C2948/92323; B29C2948/92361; B29C2948/9238; B29C2948/92504; B29C2948/9258; B29C2948/9259; B29C2948/92819; B29C2948/92857; B29C2948/92876; B29C2948/92885; B29C48/03; B29C48/05
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
109 words
An improved vented screw pump for molten thermoplastic polymer having a means for feeding molten polymer into a vent chamber and a screw for removing the molten polymer from the vent chamber and pressurising it characterised by the combination of an annular channel (13, 14) through which the molten polymer is fed into the vent chamber (6) and whereby the molten polymer is caused to flow as an annular film down the wall of the vent chamber and a screw (2) located below the vent chamber the vent chamber (6) being provided with a wiper (15) to wipe the molten polymer from the wall of the vent chamber (6).
Claim 2
Dependent Claim
109 words
An improved vented screw pump for molten thermoplastic polymer having a means for feeding molten polymer into a vent chamber and a screw for removing the molten polymer from the vent chamber and pressurising it characterised by the combination of an annular channel (13, 14) through which the molten polymer is fed into the vent chamber (6) and whereby the molten polymer is caused to flow as an annular film down the wall of the vent chamber and a screw (2) located below the vent chamber the vent chamber (6) being provided with a wiper (15) to wipe the molten polymer from the wall of the vent chamber (6).
Claim 3
Dependent Claim
24 words
A vented screw pump according to claim 1 wherein the screw is operated in a vertical position and is driven from its lower end.
Claim 4
Dependent Claim
20 words
A vented screw pump according to claim 2 wherein the wiper is mounted on the upper end of the screw.
Claim 5
Dependent Claim
17 words
A vented screw pump according to claim 1 wherein the screw is operated in a horizontal position.
Claim 6
Dependent Claim
27 words
A vented screw pump according to any one of the preceding claims having a sensing device to detect the level of molten polymer in the vent chamber.
Claim 7
Dependent Claim
17 words
A vented screw pump according to claim 5 wherein the sensing device is of a non-contact type.
Claim 8
Dependent Claim
31 words
A vented screw pump according to any one of the preceding claims wherein the wiper is shaped such that it pushes the wiped polymer downwards along the wiper towards the screw.
Claim 9
Dependent Claim
18 words
A synthetic fibre melt-spinning machine incorporating a vented screw pump according to any one of the preceding claims.
Claim 10
Dependent Claim
83 words
An improved process for venting and pumping molten thermoplastic polymer wherein molten polymer is fed under pressure into a vent chamber from which it is removed and pressurised by a screw characterised by causing the molten polymer to flow as an annular film down the wall of the vent chamber (6), wiping the molten polymer from the wall of the vent chamber and pumping the molten polymer from the base of the vent chamber by a screw (2) located below the vent chamber.
Claim 11
Dependent Claim
83 words
An improved process for venting and pumping molten thermoplastic polymer wherein molten polymer is fed under pressure into a vent chamber from which it is removed and pressurised by a screw characterised by causing the molten polymer to flow as an annular film down the wall of the vent chamber (6), wiping the molten polymer from the wall of the vent chamber and pumping the molten polymer from the base of the vent chamber by a screw (2) located below the vent chamber.
Claim 12
Dependent Claim
22 words
A process according to claim 9 wherein the screw is operated in a vertical position and is driven from its lower end.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.