US3749375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for mixing, kneading and granulating thermosetting plastic material in continuous operation
Assignee: Werner and Pfleiderer GmbH
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Filing: 1972-02-07
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Granted: 1973-07-31
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Expires: 1992-02-07
Abstract
Abstract A process for mixing, kneading and granulating thermosetting plastic material in continuous operation resides in first feeding the material through a first mixing zone of a screw extruder. While the material passes through this zone it is mixed, homogenized,and also partly condensed. Before the material reaches a second mixing zone in the extruder an agent adapted to interrupt the condensation reaction in the material and to reduce the viscosity thereof is fed into the extruder. This agent is intimately intermingled with the material as the same passes through the second mixing zone thereby interrupting the condensation reaction and reducing the viscosity of the material. After passing through the second zone, the material is extruded through a perforated discharge plate at the end of the extruder and finally granulated by suitable cutting means disposed directly adjacent to the exit side of the perforated plate. There is also disclosed an extruder arranged for carrying out the process of the invention.
Inventors
- 👤 H Hermann
- 👤 H Ocker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:40
CPC Classifications
C; C08; C08J; C08J5/00; B; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/421; B29B7/46; B29B7/48; B29B7/482; B29B7/483; B29B7/80; B29B7/88; B29B9/00; B29B9/02; B29B9/06; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/04; B29C48/25; B29C48/36; B29C48/375; B29C48/385; B29C48/05
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
193 words
A process for mixing, kneading and granulating thermosetting plastic material in continuous operation, said process comprising the steps of: providing a screw extruder having a casing with an inlet port at one end and a perforated discharge plate at the other end, said casing including a first mixing zone adjacent to the feed end and a second mixing zone adjacent to the discharge end of the casing and further providing granulating means in direct coaction with said plate; conveying thermosetting plastic material fed into the casing through the inlet port thereof through the first mixing zone by operation of the screw extruder, passage of the material through said first zone melting, mixing, kneading, homogenizing and partly condensing the material; feeding a condensation reaction interrupting and viscosity reducing agent into the casing at a point downstream of the first mixing zone and upstream of the second mixing zone; then conveying material through the second mixing zone for mixing the material with said agent, the action of said agent interrupting the condensation reaction in the material and reducing the viscosity thereof; and finally extruding the material through said perforated plate and granulating the extruded material.
Claim 2
Dependent Claim
193 words
A process for mixing, kneading and granulating thermosetting plastic material in continuous operation, said process comprising the steps of: providing a screw extruder having a casing with an inlet port at one end and a perforated discharge plate at the other end, said casing including a first mixing zone adjacent to the feed end and a second mixing zone adjacent to the discharge end of the casing and further providing granulating means in direct coaction with said plate; conveying thermosetting plastic material fed into the casing through the inlet port thereof through the first mixing zone by operation of the screw extruder, passage of the material through said first zone melting, mixing, kneading, homogenizing and partly condensing the material; feeding a condensation reaction interrupting and viscosity reducing agent into the casing at a point downstream of the first mixing zone and upstream of the second mixing zone; then conveying material through the second mixing zone for mixing the material with said agent, the action of said agent interrupting the condensation reaction in the material and reducing the viscosity thereof; and finally extruding the material through said perforated plate and granulating the extruded material.
Claim 3
Dependent Claim
46 words
The process according to claim 1 wherein the said condensation reaction interrupting and viscosity reducing agent are fed into the casing at the rate of 0.5 to 8 volume percent relative to the outflow of the thermosetting plastic material through said discharge plate of the extruder.
Claim 4
Dependent Claim
20 words
The process according to claim 2 wherein 1 to 2 volume percent of the agent are fed into the casing.
Claim 5
Dependent Claim
11 words
The process according to claim 1 wherein said agent is water.
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |