US4937034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for cofeeding additives with polymer flake
Assignee: Invista North America LLC
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Filing: 1989-04-03
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Granted: 1990-06-26
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Expires: 2009-04-03
Abstract
Abstract A method and apparatus for cofeeding additive concentrates in the form of pellets with a polymer flake stream flowing in a supply chute to a melt extruder. The pellets are introduced through an opening in the chute which is covered by an umbrella-like housing that has an opening facing the melt extruder. The flake flows around the umbrella-like housing creating a pocket to provide unimpeded entry of the pellets into the polymer stream.
Inventors
- 👤 William J. Sewell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:07
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/285; B29C48/29; B29C48/03; B29K; B29K2105/00; B29K2105/0005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
In an apparatus for supplying polymer flake to a melt extruder that includes a vertically oriented flake supply chute defined by sidewalls and having inlet and outlet ends with the outlet end being attached to the feed zone of the extruder, the improvement of which comprises: means for supplying an additive in the form of pellets horizontally into the flake supply chute through a sidewall opening located between the inlet and outlet ends of the flake supply chute and a housing enclosing said opening, said housing extending into said flake supply chute and having a single opening directed toward said feed zone.
Claim 2
Dependent Claim
102 words
In an apparatus for supplying polymer flake to a melt extruder that includes a vertically oriented flake supply chute defined by sidewalls and having inlet and outlet ends with the outlet end being attached to the feed zone of the extruder, the improvement of which comprises: means for supplying an additive in the form of pellets horizontally into the flake supply chute through a sidewall opening located between the inlet and outlet ends of the flake supply chute and a housing enclosing said opening, said housing extending into said flake supply chute and having a single opening directed toward said feed zone.
Claim 3
Dependent Claim
32 words
The apparatus of claim 1 wherein said means for supplying the pellets is a driven screw associated with said opening located between the inlet and outlet ends of the flake supply chute.
Claim 4
Independent Claim
70 words
A method for blending an additive in the form of pellets with polymer flake flowing downwardly in a stream in a vertically oriented flake supply chute to a feed zone of a screw-melter extruder, said method comprising: introducing said pellets horizontally into said chute; shielding said pellets, as they are introduced, from the downwardly flowing polymer flake stream to permit unimpeded entry of the pellets into the polymer flake stream.
Claim 5
Independent Claim
70 words
A method for blending an additive in the form of pellets with polymer flake flowing downwardly in a stream in a vertically oriented flake supply chute to a feed zone of a screw-melter extruder, said method comprising: introducing said pellets horizontally into said chute; shielding said pellets, as they are introduced, from the downwardly flowing polymer flake stream to permit unimpeded entry of the pellets into the polymer flake stream.
Claim 6
Dependent Claim
14 words
The method as defined in claim 3 wherein the additive is a color concentrate.
References Cited (Backward Citations)
US3148412A
Cited
US3353974A
Cited
US3477698A
Cited
US3673147A
Cited
US3969312A
Cited
US3972665A
Cited
JPS5438358A
Cited
US4353851A
Cited
JPS5793118A
Cited
DE3600566C1
Cited
US4684488A
Cited
US4728475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |