Patent US807551A successfully refreshed from Google Patents.
US3799718A
Expired / Lapsed
US
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Apparatus for producing a thermoplastic resin sheet having a color band
Assignee: Sekisui Chemical Co Ltd
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Filing: 1971-12-16
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Granted: 1974-03-26
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Expires: 1991-12-16
Abstract
Abstract 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 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, and extruding the associated streams from the extrusion opening of said flat die.
Inventors
- 👤 H Kiyono
- 👤 Y Ishigaki
- 👤 G Endo
- 👤 J Nakashima
- 👤 Y Fujisaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:21
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: 7
Claim 1
Independent Claim
167 words
An apparatus for producing a thermoplastic resin sheet having a color band comprising a. an extrusion member including means for extruding a main stream of a thermoplastic resin, said extrusion member having b. a sheet-forming flat die and c. injection means for extruding a stream of a colored thermoplastic resin into the main stream of the resin in said die and associating said streams, said injection means including d. an injection port in said flat die for introduction of said colored thermoplastic resin, said flat die including e. an inlet for this main stream of resin, f. a mainfold, g. a substantially flat die-land surface adajacent and downstream of said manifold and terminating in h. a die lip, said manifold having a substantially flat surface adjacent said die-land at an angle of between 30* and 45* to said die-land, and said injection port is positioned in said substantially flat surface at a point at which the main resin stream is being spread laterally of the downstream flow.
Claim 2
Independent Claim
167 words
An apparatus for producing a thermoplastic resin sheet having a color band comprising a. an extrusion member including means for extruding a main stream of a thermoplastic resin, said extrusion member having b. a sheet-forming flat die and c. injection means for extruding a stream of a colored thermoplastic resin into the main stream of the resin in said die and associating said streams, said injection means including d. an injection port in said flat die for introduction of said colored thermoplastic resin, said flat die including e. an inlet for this main stream of resin, f. a mainfold, g. a substantially flat die-land surface adajacent and downstream of said manifold and terminating in h. a die lip, said manifold having a substantially flat surface adjacent said die-land at an angle of between 30* and 45* to said die-land, and said injection port is positioned in said substantially flat surface at a point at which the main resin stream is being spread laterally of the downstream flow.
Claim 3
Dependent Claim
20 words
An apparatus as set forth in claim 1 in which the injection port forms a circle on the angled surface.
Claim 4
Dependent Claim
16 words
An apparatus as set forth in claim 1 in which the injection port forms an ellipse.
Claim 5
Dependent Claim
16 words
An apparatus as set forth in claim 1 in which the injection port forms a crescent.
Claim 6
Dependent Claim
38 words
An apparatus as set forth in claim 3 in which the ellipse formed by the injecton port is asymmetrical and has one side along its major axis elongated with respect to the opposite side along the major axis.
Claim 7
Dependent Claim
64 words
An apparatus as set forth in claim 5 in which said asymmetrical ellipse is positioned so that one end of the ellipse is closer to the die-land that the opposite end of the ellipse, said closer ellipse-end is also closer to the center of the manifold, and said inlet for the main stream of resin is positioned substantially at the center of the manifold.
References Cited (Backward Citations)
US3565737A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |