US3988401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compression molding of thermoplastic material
Assignee: Union Carbide Corp
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Filing: 1975-06-20
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Granted: 1976-10-26
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Expires: 1995-06-20
Abstract
Abstract A method is disclosed for the continuous molding of compressed bodies of thermoplastic material of uniform shape comprising feeding a thermally-softened stream of material to a rotary compression molding zone to form a sheet of interconnected compressed bodies, and disintegrating said sheet to form a plurality of compressed bodies of uniform shape.
Inventors
- 👤 Howard Edward Kasting
- 👤 Roger Brown Staub
- 👤 Ward John Klingebiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:26
CPC Classifications
B; B29; B29B; B29B17/00; B29B17/04; B29B17/0412; B29B9/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
115 words
The method of making molded bodies of thermoplastic material of uniform shape from a mixture of particulate thermoplastic virgin material and recycled fines formed in the method comprising: feeding both virgin thermoplastic material and recycled fines to the same heatermixer, separately both heating said virgin material and reheating said fines in said heater-mixer, said recycled fines being reheated for a shorter time than said virgin material is heated, mixing said virgin material and said fines to form a mixture, continuously compressing said mixture to form a sheet of interconnected molded bodies; disintegrating said sheet to form a plurality of separate molded bodies of uniform shape and fines and recycling said fines to said reheating step.
Claim 2
Independent Claim
115 words
The method of making molded bodies of thermoplastic material of uniform shape from a mixture of particulate thermoplastic virgin material and recycled fines formed in the method comprising: feeding both virgin thermoplastic material and recycled fines to the same heatermixer, separately both heating said virgin material and reheating said fines in said heater-mixer, said recycled fines being reheated for a shorter time than said virgin material is heated, mixing said virgin material and said fines to form a mixture, continuously compressing said mixture to form a sheet of interconnected molded bodies; disintegrating said sheet to form a plurality of separate molded bodies of uniform shape and fines and recycling said fines to said reheating step.
Claim 3
Dependent Claim
49 words
The method for the continuous production of molded bodies of thermoplastic material of uniform shape from particulate thermoplastic material in accordance with claim 1, wherein a coarse, oversize fraction is also obtained in said disintegrating step, comprising the added step of recycling said coarse fraction to said disintegrating step.
Claim 4
Independent Claim
141 words
The method of making molded bodies of uniform shape from a mixture of particulate virgin thermoplastic material and recycled thermoplastic fines formed in the method, comprising: feeding both virgin material and recycled fines to the same heater-mixer said heater-mixer having two separated heating and mixing zones, a first heating zone for said virgin material having a longer passage than the second zone for heating said fines, separately both heating said virgin material and reheating said fines in said heater-mixer, said recycled fines being reheated for a shorter time than said virgin material is heated, mixing said virgin material and said fines to form a mixture, continuously compressing said mixture to form a sheet of interconnected molded bodies; disintegrating said sheet to form a plurality of separate molded bodies of uniform shape and fines and recycling said fines to said reheating step.
Claim 5
Independent Claim
141 words
The method of making molded bodies of uniform shape from a mixture of particulate virgin thermoplastic material and recycled thermoplastic fines formed in the method, comprising: feeding both virgin material and recycled fines to the same heater-mixer said heater-mixer having two separated heating and mixing zones, a first heating zone for said virgin material having a longer passage than the second zone for heating said fines, separately both heating said virgin material and reheating said fines in said heater-mixer, said recycled fines being reheated for a shorter time than said virgin material is heated, mixing said virgin material and said fines to form a mixture, continuously compressing said mixture to form a sheet of interconnected molded bodies; disintegrating said sheet to form a plurality of separate molded bodies of uniform shape and fines and recycling said fines to said reheating step.
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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) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |