US3912439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strand extrusion apparatus
Assignee: Dow Chemical Co
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Filing: 1974-11-04
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Granted: 1975-10-14
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Expires: 1994-11-04
Abstract
Abstract Strands of heat plastified thermoplastic resin are readily prepared employing an extrusion apparatus having a die with a number of openings arranged in a generally linear manner. The die has a die plate having about twice the number of openings required, the die plate is about twice the length of the die. The die may readily be cleaned by sliding the die plate along the die to expose the openings requiring cleaning.
Inventors
- 👤 Jr Ritchey O Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:51
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/345; B29C48/03; B29C48/05; B29C48/256; B29C48/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
A polymer extrusion apparatus, the polymer extrusion apparatus comprising a housing, the housing defining an extrusion passageway, the extrusion passageway having an inlet and an outlet end, the outlet end having an elongate slotlike configuration, a die plate affixed to the housing, the die plate having a plurality of extrusion orifices disposed therein, at least a portion of the orifices being in communication with the outlet end of the extrusion passageway, the die plate being slidably positioned on the housing so as to selectively position the extrusion orifices in register with the outlet end of the passageway and selectively position other extrusion orifices remote from the housing where they are accessible for cleaning.
Claim 2
Dependent Claim
113 words
A polymer extrusion apparatus, the polymer extrusion apparatus comprising a housing, the housing defining an extrusion passageway, the extrusion passageway having an inlet and an outlet end, the outlet end having an elongate slotlike configuration, a die plate affixed to the housing, the die plate having a plurality of extrusion orifices disposed therein, at least a portion of the orifices being in communication with the outlet end of the extrusion passageway, the die plate being slidably positioned on the housing so as to selectively position the extrusion orifices in register with the outlet end of the passageway and selectively position other extrusion orifices remote from the housing where they are accessible for cleaning.
Claim 3
Dependent Claim
53 words
The apparatus of claim 1 wherein the die plate has a first end and a second end and at least one purge extrusion orifice disposed at each end of the die plate, the purge extrusion orifices extending generally parallel to the extrusion orifices and having a substantially greater diameter than the extrusion orifices.
Claim 4
Dependent Claim
26 words
The apparatus of claim 1 including a linear actuator in operative combination with the die plate, the linear actuator adapted to selectively position the die plate.
Claim 5
Dependent Claim
12 words
The apparatus of claim 1 in operative combination with a strand cutter.
References Cited (Backward Citations)
US3762854A
Cited
US3737269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |