Patent US3676537A successfully refreshed from Google Patents.
US3676537A
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Continuous method of extruding and thero-forming skin-covered foamed thermoplastic articles
Assignee: Solo Cup Operating Corp
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Filing: 1969-12-08
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Granted: 1972-07-11
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Expires: 1989-12-08
Abstract
Abstract Three-dimensionally formed articles of foamed thermoplastic material having a low-density core and at least one integral, high-density, thin skin are produced on a continuous basis. A narrow strip of the thermoplastic material is extruded at a high linear rate from an arcuate mouth die, immediately surfacechilled to produce the skin, laterally expanded over a curved mandrel, and fed continuously to apparatus for threedimensionally forming individual articles. The operating parameters are critically controlled to permit deep-draw threedimensional forming by utilization of the heat of extrusion.
Inventors
- 👤 Thomas W Winstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:25
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/34; B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/505; B29C48/00; B29C48/03; B29C48/05; B29C48/07; B29C48/25; B29C48/30; B29C48/3001; B29C48/3003; B29C48/305; B29C48/88; B29C48/911; B29C48/9135; B29C51/00; B29C51/02; B29C51/18; B29C51/20; B29C51/22; B29C51/225; B29C35/00; B29C35/16; B29C48/001; B29C48/0017; B29C48/0018; B29C48/0022; B29C48/08; B29C48/09; B29C48/10; B29C48/12; B29C48/13; B29C48/90; B29C48/904; B29K; B29K2105/00; B29K2105/04; B29K2105/043; B29K2995/00; B29K2995/0037; B29K2995/005; B29K2995/0053; B29K2995/0072; B29L; B29L2007/00; B29L2007/008; B29L2023/00; B29L2023/001; Y; Y10; Y10S; Y10S264/00; Y10S264/14; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249989
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
18 words
A method in accordance with claim 1, wherein said spreading comprises bi-axially orienting the molecules of said skin.
Claim 2
Dependent Claim
45 words
A method in accordance with claim 1, wherein said spreading is accomplished by passing the extrudate over a mandrel spaced about 2 to 3 inches from said die, and wherein said forming commences about 6 inches from said mandrel along the length of said extrudate.
Claim 3
Dependent Claim
35 words
A method in accordance with claim 1, wherein the blowing agent is volatile, and wherein said spreading and forming are accomplished while said blowing agent remains under sufficient pressure to provide plasticity for said extrudate.
References Cited (Backward Citations)
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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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |