Patent US3729539A successfully refreshed from Google Patents.
US3729539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling of plastic extrusions of small cross-sectional area
Assignee: PLCV Ltd
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Filing: 1970-06-30
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Granted: 1973-04-24
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Expires: 1990-06-30
Abstract
Abstract A method of cooling a plastic extrusion of small cross sectional area, which method includes the steps of drawing the extrusion along a predetermined path and directing water onto it at least at one position along the path so as not to disturb the lateral stability of the extrusion. The water impinging on the extrusion has a substantial component of velocity in the direction in which the extrusion is being drawn.
Inventors
- 👤 A Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:43
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/919; B29C48/03; B29C48/05; B29C48/06; B29C48/911
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
A method of cooling a plastic extrusion of small crosssectional area over a thin conductor moving horizontally at a high extrusion rate of not less than about 1,500 feet per minute, said extrusion and conductor having a total combined diameter not exceeding about 0.060 inch, including the steps of drawing the extrusion along a predetermined path and directing water onto the extrusion at least at one position along said path under such conditions that the water impinges upon the periphery of the extrusion so as not to displace it from its natural axis of motion and hence not to disturb the lateral stability of the extrusion, the water impinging on the extrusion having a substantial component of velocity in the direction in which the extrusion is being drawn, said component of velocity being not less than 40 percent of the velocity at which the extrusion is itself moving.
Claim 2
Independent Claim
148 words
A method of cooling a plastic extrusion of small crosssectional area over a thin conductor moving horizontally at a high extrusion rate of not less than about 1,500 feet per minute, said extrusion and conductor having a total combined diameter not exceeding about 0.060 inch, including the steps of drawing the extrusion along a predetermined path and directing water onto the extrusion at least at one position along said path under such conditions that the water impinges upon the periphery of the extrusion so as not to displace it from its natural axis of motion and hence not to disturb the lateral stability of the extrusion, the water impinging on the extrusion having a substantial component of velocity in the direction in which the extrusion is being drawn, said component of velocity being not less than 40 percent of the velocity at which the extrusion is itself moving.
Claim 3
Dependent Claim
59 words
A method as claim in claim 1 in which water is directed onto the extrusion at least at one position along said path from at least one water nozzle having an annular orifice from which water is directed onto the extrusion at all positions around the periphery as it passes from an orifice concentric with the said annular orifice.
Claim 4
Dependent Claim
30 words
A method as claimed in claim 1 in which water is directed onto the extrusion at a plurality of positions along said path from a plurality of spaced-apart water nozzles.
Claim 5
Dependent Claim
41 words
A method as claimed in claim 1 including the step of directing a series in excess of two of equiangularly spaced jets of water onto the extrusion at least at one position along said path from at least one water nozzle.
Claim 6
Dependent Claim
33 words
A method as claimed in claim 4 including the step of directing jets of water onto the extrusion at a plurality of positions along said path from a plurality of spaced-apart water nozzles.
Claim 7
Dependent Claim
26 words
A method as claimed in claim 1 including the step of cooling the extrusion along a guide trough positioned downstream of the position of water impingement.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |