US3635631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous molding of thermoplastic resin
Assignee: EIDP Inc
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Filing: 1970-06-10
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Granted: 1972-01-18
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Expires: 1990-06-10
Abstract
Abstract Molten thermoplastic resin, e.g., polyethylene is forced into a pattern on the surface of a rotating roll to form a web of the resin, the resin being forced into the pattern through a die having a zigzag upstream edge.
Inventors
- 👤 Reuben Thomas Fields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:46
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22; B29C43/222; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/12; B29C48/13; B29C48/25; B29C48/30; B29C48/35; Y; Y10; Y10S; Y10S264/00; Y10S264/47
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
Apparatus for continuously molding thermoplastic resin, comprising structure defining a moving surface having a pattern therein and die means having a passage terminating in an outlet positioned in pressure-seal relation with said moving surface for directing molten thermoplastic resin through said outlet into said pattern, said outlet defined by a downstream surface terminating in a doctor blade and an upstream surface terminating in a zigzag edge having interior and exterior reversals, the interior reversals having an included angle of between 20* and 120*, whereby said molten thermoplastic resin is forced into said pattern to obtain a continuous web of said molten thermoplastic resin, means for cooling the web and means for removing it from said surface.
Claim 2
Dependent Claim
116 words
Apparatus for continuously molding thermoplastic resin, comprising structure defining a moving surface having a pattern therein and die means having a passage terminating in an outlet positioned in pressure-seal relation with said moving surface for directing molten thermoplastic resin through said outlet into said pattern, said outlet defined by a downstream surface terminating in a doctor blade and an upstream surface terminating in a zigzag edge having interior and exterior reversals, the interior reversals having an included angle of between 20* and 120*, whereby said molten thermoplastic resin is forced into said pattern to obtain a continuous web of said molten thermoplastic resin, means for cooling the web and means for removing it from said surface.
Claim 3
Dependent Claim
171 words
Apparatus for continuously molding thermoplastic resin, comprising structure defining a moving surface having a pattern therein, and die means having an outlet positioned in pressure-seal relation with said moving surface for directing molten thermoplastic resin through said outlet into said pattern, said surface having at least grooves running substantially circumferentially and transversely therein, said die means having a passage terminating in an outlet positioned in pressure-seal relation with said moving surface for directing molten thermoplastic resin through said outlet into said pattern, said outlet defined by a downstream surface terminating in a doctor blade and an upstream surface terminating in a zigzag edge having interior and exterior reversals, the interior reversals having an included angle of between 20* and 120*, at least some of the interior reversals coinciding with a circumferential groove in said pattern of said moving surface, whereby molten thermoplastic resin is forced into said pattern to obtain a continuous web of said molten thermoplastic resin, means for cooling the web and means for removing it from said surface.
Claim 4
Dependent Claim
171 words
Apparatus for continuously molding thermoplastic resin, comprising structure defining a moving surface having a pattern therein, and die means having an outlet positioned in pressure-seal relation with said moving surface for directing molten thermoplastic resin through said outlet into said pattern, said surface having at least grooves running substantially circumferentially and transversely therein, said die means having a passage terminating in an outlet positioned in pressure-seal relation with said moving surface for directing molten thermoplastic resin through said outlet into said pattern, said outlet defined by a downstream surface terminating in a doctor blade and an upstream surface terminating in a zigzag edge having interior and exterior reversals, the interior reversals having an included angle of between 20* and 120*, at least some of the interior reversals coinciding with a circumferential groove in said pattern of said moving surface, whereby molten thermoplastic resin is forced into said pattern to obtain a continuous web of said molten thermoplastic resin, means for cooling the web and means for removing it from said surface.
Claim 5
Dependent Claim
18 words
The apparatus of claim 1 wherein the interior reversal has an included angle of between 60* and 90*.
Claim 6
Dependent Claim
18 words
The apparatus of claim 2 wherein the interior reversal has an included angle of between 60* and 90*.
Claim 7
Dependent Claim
21 words
The apparatus of claim 1 wherein the passage is wedge-shaped and extends in the direction of movement of the patterned surface.
Claim 8
Dependent Claim
21 words
The apparatus of claim 2 wherein the passage is wedge-shaped and extends in the direction of movement of the patterned surface.
Claim 9
Dependent Claim
11 words
The apparatus of claim 5 wherein the surface is a roll.
Claim 10
Dependent Claim
11 words
The apparatus of claim 6 wherein the surface is a roll.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |