US3687589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the controlled extrusion of multi-component synthetic resinous bodies
Assignee: Dow Chemical Co
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Filing: 1970-07-20
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Granted: 1972-08-29
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Expires: 1990-07-20
Abstract
Abstract In extrusion of layered film where a layered stream is discharged from a single die, control of the volume of material passing through the feed ports is obtained by introducing varying mechanical shear rates to at least a portion of the individual layers of the composite stream.
Inventors
- 👤 Walter J Schrenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:46
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/305; B29C48/307; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/21
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
162 words
An apparatus for the simultaneous extrusion of at least two diverse synthetic resinous materials into a layered composite body, the apparatus comprising a first heat plastified synthetic resinous material supply means adapted to deliver a first heat plastified stream, a second heat plastified synthetic resinous material supply means adapted to deliver a second heat plastified stream, means to divide the first stream and means to divide the second stream into a plurality of substreams, each means having an entrance and an exit, means to recombine the substreams in a desired relationship into a composite layered stream, means to deform the composite layered stream into a desired configuration, the improvement which comprises stream shearing means for selectively applying a shearing force, by continual mechanical motion of a surface of said stream shearing means in contact with a stream, wherein the stream shearing means comprises at least one moveable body positioned adjacent to, and in spaced relationship to the entrance of a dividing means.
Claim 2
Independent Claim
162 words
An apparatus for the simultaneous extrusion of at least two diverse synthetic resinous materials into a layered composite body, the apparatus comprising a first heat plastified synthetic resinous material supply means adapted to deliver a first heat plastified stream, a second heat plastified synthetic resinous material supply means adapted to deliver a second heat plastified stream, means to divide the first stream and means to divide the second stream into a plurality of substreams, each means having an entrance and an exit, means to recombine the substreams in a desired relationship into a composite layered stream, means to deform the composite layered stream into a desired configuration, the improvement which comprises stream shearing means for selectively applying a shearing force, by continual mechanical motion of a surface of said stream shearing means in contact with a stream, wherein the stream shearing means comprises at least one moveable body positioned adjacent to, and in spaced relationship to the entrance of a dividing means.
Claim 3
Dependent Claim
20 words
The apparatus of claim 1 wherein the means to selectively apply a shearing force comprises at least one rotating element.
Claim 4
Dependent Claim
18 words
The apparatus of claim 1 wherein the means to selectively apply a shearing force is a reciprocating element.
Claim 5
Dependent Claim
85 words
The apparatus of claim 1 wherein the means to deform the composite stream into a desired configuration comprises a housing defining a passageway, the passageway having an entrance portion and a discharge portion, the entrance and discharge portions being of elongate cross-sectional configuration and the cross-sectional configurations lying in planes generally normal to the axis of the passageway, the longitudinal axis of the entrance and discharge cross-sectional configurations being disposed in planes generally normal to each other and containing a longitudinal axis of the passageway.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |