US4184832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Die construction
Assignee: Leesona Corp
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Filing: 1978-07-03
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Granted: 1980-01-22
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Expires: 1998-07-03
Abstract
Abstract An extrusion pelleting apparatus is disclosed wherein the outermost portion of an extrusion orifice is surrounded by a heat reservoir maintained at a temperature significantly higher than the softening temperature range of the polymer being extruded. The high temperature heat reservoir constitutes a heat source from which individual extrusion orifices may be heated above the polymer's softening range to assist in melting frozen plugs of polymer which may block the orifice from time to time. Also disclosed is a heat flow control mechanism, in effect, for slowing the heat release from the reservoir to the individual extrusion orifices for economy of operation while still making available such high temperature source for unfreezing such plugs.
Inventors
- 👤 David W. Cuff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:56
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/02; B29B9/06; B29B9/065; B29B7/00; B29B7/30; B29B7/58; B29B7/582; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/06; B29C48/25; B29C48/30; B29C48/345; B29C48/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
A plural orifice extrusion die comprising: an apertured plate for operative engagement with an extruder, a second plate having a plurality of insert members positioned herein and passing therethrough and each extending from a side of said second plate opposite said apertured plate, porous members each having an orifice therethrough in sealed relationship with both said apertured plate and one of said insert members, means to conduct liquid coolant to exteriors of said porous members, each of said insert members having a through orifice, and a heater plate forming a heat reservoir in contact with each of said insert members adjacent an exit end of an extending portion thereof and said heater plate also surrounding said insert members and being spaced therefrom and also spaced from said second plate to insulate said insert members from said heater plate except where said heater plate contacts said insert members.
Claim 2
Dependent Claim
147 words
A plural orifice extrusion die comprising: an apertured plate for operative engagement with an extruder, a second plate having a plurality of insert members positioned herein and passing therethrough and each extending from a side of said second plate opposite said apertured plate, porous members each having an orifice therethrough in sealed relationship with both said apertured plate and one of said insert members, means to conduct liquid coolant to exteriors of said porous members, each of said insert members having a through orifice, and a heater plate forming a heat reservoir in contact with each of said insert members adjacent an exit end of an extending portion thereof and said heater plate also surrounding said insert members and being spaced therefrom and also spaced from said second plate to insulate said insert members from said heater plate except where said heater plate contacts said insert members.
Claim 3
Dependent Claim
36 words
The apparatus as set forth in claim 1, including cutting means movably mounted adjacent an exit face of said die for severing extruded said material into discrete separate pellets as such emerges from said exit face.
Claim 4
Dependent Claim
26 words
The apparatus as set forth in claim 1, including means positioned intermediate said orifice and said heat reservoir for reducing the rate of heat flow therebetween.
Claim 5
Dependent Claim
17 words
The apparatus as set forth in claim 3, wherein said heat rate reducing means comprises insulating means.
Claim 6
Dependent Claim
18 words
The apparatus as set forth in claim 3, wherein heat flow rate reducing means comprises an air gap.
Claim 7
Dependent Claim
16 words
The apparatus as set forth in claim 4, wherein said insulating means comprises a ceramic insert.
References Cited (Backward Citations)
US721462A
Cited
US1693315A
Cited
US1592671A
Cited
US1883704A
Cited
US2127487A
Cited
US2787024A
Cited
US3069727A
Cited
US3177280A
Cited
US3188370A
Cited
GB972182A
Cited
US3202742A
Cited
US3241186A
Cited
US3437725A
Cited
US3848034A
Cited
US3792950A
Cited
US3981959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |