US4183673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marbleization of plastic materials
Assignee: Gillette Co LLC
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Filing: 1978-11-16
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Granted: 1980-01-15
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Expires: 1998-11-16
Abstract
Abstract Methods and apparatus for marbleizing molded parts produced by screw extruder machines. Liquid colorant is advantageously injected at a comparatively high pressure into a melt containing portion of the machine between the screw and its housing, where the melt is either completely molten or more than fifty percent molten.
Inventors
- 👤 Wiley L. Easley
- 👤 Richard J. Hoeske
- 👤 Silvio Petrucci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:46
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/18; B29C45/1816; B29C45/16; B29C45/1634
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
Apparatus for marbleizing molded parts comprising a housing; a rotatable injection screw within said housing; said injection screw having a feed section, a transition section with a root diameter that increases from said feed section, and a metering section; means for applying plastic material to said feed section for conveyance in the direction of screw rotation towards the transition section which provides an increase in pressure and converts substantially the entire feed to molten condition in said metering section; means for injecting colorant liquid into the melt where said screw contains only a primary flight; means for directly coupling a mold to the output of said metering section which develops an increased level of pressure for the direct injection of molten plastic material with unmixed colorant into said mold; and means for maintaining the fluidity of said melt.
Claim 2
Dependent Claim
138 words
Apparatus for marbleizing molded parts comprising a housing; a rotatable injection screw within said housing; said injection screw having a feed section, a transition section with a root diameter that increases from said feed section, and a metering section; means for applying plastic material to said feed section for conveyance in the direction of screw rotation towards the transition section which provides an increase in pressure and converts substantially the entire feed to molten condition in said metering section; means for injecting colorant liquid into the melt where said screw contains only a primary flight; means for directly coupling a mold to the output of said metering section which develops an increased level of pressure for the direct injection of molten plastic material with unmixed colorant into said mold; and means for maintaining the fluidity of said melt.
Claim 3
Dependent Claim
33 words
Apparatus as defined in claim 1 wherein the injecting means injects said colorant liquid into said mold at a pressure at least three times as great as the maximum pressure in said housing.
Claim 4
Dependent Claim
21 words
Apparatus as defined in claim 1 wherein the injecting means operates at a pressure above about 3,000 pounds per square inch.
Claim 5
Dependent Claim
21 words
Apparatus as defined in claim 3 wherein the injecting means operates at a pressure of about 3,600 pounds per square inch.
Claim 6
Dependent Claim
27 words
Apparatus as defined in claim 1 wherein the injecting means includes one outlet orifice having a diameter in the range from about 0.018 to about 0.025 inches.
Claim 7
Dependent Claim
17 words
Apparatus as defined in claim 5 wherein said outlet orifice has an outlet of about 0.023 inches.
Claim 8
Dependent Claim
31 words
Apparatus as defined in claim 1 wherein the injecting means includes an injecting fitting with an injecting capacity in the range of about 0.001 to about 0.008 cubic inches per stroke.
Claim 9
Dependent Claim
15 words
Apparatus as defined in claim 1 wherein said injecting screw is of the reciprocating type.
Claim 10
Dependent Claim
18 words
Apparatus as defined in claim 1 wherein said apparatus includes a plurality of means for injecting colorant liquid.
Claim 11
Dependent Claim
28 words
Apparatus as defined in claim 1 wherein the injecting means is positioned to inject said colorant liquid into said melt where said melt is more than 50% molten.
References Cited (Backward Citations)
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Cited
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US3764114A
Cited
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Cited
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Cited
US3905588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |