US3890074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion and cooling plant for plastics strands
Assignee: Individual
•
Filing: 1973-04-17
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Granted: 1975-06-17
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Expires: 1993-04-17
Abstract
Abstract Plastics strands are simultaneously extruded through apertures in the underside of a die head. A pair of conveyor belts arranged face to face and forming an inlet funnel below the die head draw the strands into a coolant bath. The die head apertures are arranged in two or more rows, the apertures of adjacent rows being offset. The facing surfaces of the conveyor belts may be provided with longitudinal ribs.
Inventors
- 👤 Rudolf Paul Fritsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:08
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/919; B29C48/03; B29C48/05; B29C48/07; B29C48/08; B29C48/30; B29C48/345; B29C48/911
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
170 words
Apparatus for extruding and cooling plastic strands comprising a tank for liquid coolant, a die head provided with at least two rows of downwardly facing apertures from which a plurality of plastic strands are to be simultaneously extruded, the apertures of each row being offset with respect to the apertures of an adjacent row, and a pair of endless conveyor belts arranged in abutting face-to-face relationship over at least a portion of their respective lengths to define an inlet funnel below said die head for receiving strands extruded therefrom and for transporting them into a coolant in said tAnk, the facing surfaces of said conveyor belts being provided with longitudinally extending ribs, the ribs of one of the pair of belts being laterally offset with respect to the ribs of the other said pair of belts, each rib of one belt defining with the space between a pair of ribs of the other belt a duct extending longitudinally of said pair of belts for transporting a single extruded plastic strand.
Claim 2
Dependent Claim
170 words
Apparatus for extruding and cooling plastic strands comprising a tank for liquid coolant, a die head provided with at least two rows of downwardly facing apertures from which a plurality of plastic strands are to be simultaneously extruded, the apertures of each row being offset with respect to the apertures of an adjacent row, and a pair of endless conveyor belts arranged in abutting face-to-face relationship over at least a portion of their respective lengths to define an inlet funnel below said die head for receiving strands extruded therefrom and for transporting them into a coolant in said tAnk, the facing surfaces of said conveyor belts being provided with longitudinally extending ribs, the ribs of one of the pair of belts being laterally offset with respect to the ribs of the other said pair of belts, each rib of one belt defining with the space between a pair of ribs of the other belt a duct extending longitudinally of said pair of belts for transporting a single extruded plastic strand.
Claim 3
Dependent Claim
46 words
The invention as defined by claim 1, wherein the outermost extremities of the ribs on one of said pair of conveyor belts project at least partially into the respective spaces defined by the sidewalls of adjacent ribs on the other of said pair of conveyor belts.
Claim 4
Dependent Claim
37 words
The invention defined in claim 1, wherein each of said pair of conveyor belts is provided with a plurality of apertures extending therethrough and disposed in the spaces between said ribs for circulating coolant while immersed therein.
Claim 5
Dependent Claim
16 words
The invention defined in claim 1, wherein said pair of conveyor belts comprise synthetic rubber material.
Claim 6
Dependent Claim
39 words
The invention defined in claim 1, wherein said two rows of apertures provided in the die head are disposed on respective opposite sides of a plane defined by the abutting faces of the conveyor belts defining said inlet funnel.
Claim 7
Dependent Claim
24 words
The invention defined in claim 1, wherein the cross-section of the ribs provided on at least one of said pair of belts is rectangular.
Claim 8
Dependent Claim
31 words
The invention defined in claim 6, wherein the surfaces of the extremities of said rectangular ribs and the surfaces of the conveyor belts between the bases of said ribs are roughened.
Claim 9
Dependent Claim
43 words
The invention defined in claim 1, wherein said pair of endless conveyor belts include two reversing rollers supporting the respective belts below said die head, and also include two coolant stripping rollers disposed for guiding the respective belts upstream from the reversing pulleys.
Claim 10
Dependent Claim
54 words
The invention defined in claim 8, wherein the axial cross-sections of the peripheral surfaces of said coolant stripping rollers is substantially complementary to the exposed sufaces of the respective conveyor belts, the height of the ribs on said rollers being less than the depth of the spaces defined by adjacent ribs on said belts.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |