US3715420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a thermoplastic resin sheet having a color band
Assignee: Sekisui Chemical Co Ltd
•
Filing: 1970-07-17
•
Granted: 1973-02-06
•
Expires: 1990-07-17
Abstract
Abstract A process is disclosed for producing a thermoplastic resin sheet having a band of color by feeding a molten thermo-plastic resin by an extruder into a sheet-forming flat die having a manifold and extruding said molten resin from an extrusion opening of said flat die, while forcing a stream of a colored molten thermoplastic resin through at least one injection port opened into the manifold of the flat die into a main stream of the molten resin extruded from the extruder and fed to the manifold, associating the main stream of the molten thermoplastic resin and the stream of the colored molten thermoplastic resin within the manifold while the main stream is flowing in the extrusion and widthwise directions in said manifold, and extruding the associated streams from the extrusion opening of said flat die.
Inventors
- 👤 H Kiyono
- 👤 J Nakashima
- 👤 G Endo
- 👤 Y Fujisaki
- 👤 Y Ishigaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:14
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10165; B32B17/10339; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/17; B29C48/175; B29C48/18; B29C48/19; B29C48/20; B29C48/25; B29C48/30; B29C48/305; B29C48/307; B32B17/1055; B32B17/10761; B29C48/15; B29C48/154; B29C48/155; B29C48/21; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24752
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
227 words
A process for producing a thermoplastic resin sheet having a band of color by feeding a molten thermoplastic resin by an extruder into a sheet-forming flat die having a manifold and extruding said molten resin from an extrusion opening of said flat die, which comprises forcing a stream of a colored molten thermoplastic resin under a pressure within the range of from 25 to 500 kg/cm2 through at least one injection port opened into said manifold of said flat die into a main stream of the molten resin extruded from said extruder and fed to said manifold, said stream of colored molten thermoplastic resin being forced into said stream of molten resin in an amount of about 3 to 30 percent by weight based upon the weight of the thermoplastic resin sheet extruded from said extrusion opening, said stream of colored molten thermoplastic resin being forced into said stream of molten resin when said stream of molten resin is flowing in the extrusion and widthwise directions in said manifold, associating the main stream of the molten thermoplastic resin and the stream of the colored molten thermoplastic within said manifold, the viscosity of the associated streams of the resin in said manifold being in the range of 5 X 103 to 1 X 105 poises; and extruding the associated streams from the extrusion opening of said flat die.
Claim 2
Dependent Claim
227 words
A process for producing a thermoplastic resin sheet having a band of color by feeding a molten thermoplastic resin by an extruder into a sheet-forming flat die having a manifold and extruding said molten resin from an extrusion opening of said flat die, which comprises forcing a stream of a colored molten thermoplastic resin under a pressure within the range of from 25 to 500 kg/cm2 through at least one injection port opened into said manifold of said flat die into a main stream of the molten resin extruded from said extruder and fed to said manifold, said stream of colored molten thermoplastic resin being forced into said stream of molten resin in an amount of about 3 to 30 percent by weight based upon the weight of the thermoplastic resin sheet extruded from said extrusion opening, said stream of colored molten thermoplastic resin being forced into said stream of molten resin when said stream of molten resin is flowing in the extrusion and widthwise directions in said manifold, associating the main stream of the molten thermoplastic resin and the stream of the colored molten thermoplastic within said manifold, the viscosity of the associated streams of the resin in said manifold being in the range of 5 X 103 to 1 X 105 poises; and extruding the associated streams from the extrusion opening of said flat die.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein said thermoplastic resin is selected from the group consisting of polyethylene, polypropylene, polystyrene, polycarbonates, polyvinyl chloride, polyamides, polyvinyl butyral, polyacrylates and polyesters.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |