US3837781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for cooling and granulating strands of plastic material discharged from an extruder
Assignee: Werner and Pfleiderer GmbH
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Filing: 1972-11-24
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Granted: 1974-09-24
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Expires: 1992-11-24
Abstract
Abstract There is disclosed a device for cooling and granulating strands of synthetic plastic material as they are continuously extruded through the discharge head of an extruder. The device comprises an extruder head with a plurality of side-by-side disposed discharge openings through which a corresponding number of strands are extruded. The strands are fed upon the pulling portion of a conveyor band disposed below the discharge head. The band has on its surface facing the discharge head a plurality of lengthwise grooves for receiving therein and holding spaced apart the strands fed upon it. The initially hot strands are cooled by directing a flow of coolant thereupon as they are carried along by the conveyor. A granulating device at the end of the pulling portion cuts the now cooled strands into pieces of selected length. The idling portion of the conveyor is subjected to cooling action so that is is reasonably cooled before it again becomes the pulling portion of the conveyor.
Inventors
- 👤 F Lambertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:17
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/02; B29B9/06; B29C; B29C48/00; B29C48/03; B29C48/04; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/9145; B29C48/919
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
199 words
A device for cooling and granulating strands of synthetic plastic material extruded through the discharge head of an extruder, said device comprising in combination: an extruder discharge head having a plurality of side-by-side disposed discharge openings for extruding strands of the material; a single continuous endless conveyor band defining a pulling portion and an idling portion and disposed underneath said discharge openings for feeding extruded strands upon one end of said pulling portion, said conveyor band including in its surface facing the discharge openings a plurality of lengthwise parallel grooves for supporting and holding apart strands fed upon said pulling portion; granulating means disposed adjacent to the other end of said pulling portion for cutting the strands to pieces of selected length; first cooling means disposed above the pulling portion of the conveyor band intermediate the ends thereof, said cooling means including discharge means for directing a coolant upon the surface of said pulling portion facing the discharge openings and the strands exposed in the grooves thereof as they pass said discharge openings of the cooling means; and second cooling means disposed for cooling said idling portion of the conveyor band as said portion passes the second cooling means.
Claim 2
Independent Claim
199 words
A device for cooling and granulating strands of synthetic plastic material extruded through the discharge head of an extruder, said device comprising in combination: an extruder discharge head having a plurality of side-by-side disposed discharge openings for extruding strands of the material; a single continuous endless conveyor band defining a pulling portion and an idling portion and disposed underneath said discharge openings for feeding extruded strands upon one end of said pulling portion, said conveyor band including in its surface facing the discharge openings a plurality of lengthwise parallel grooves for supporting and holding apart strands fed upon said pulling portion; granulating means disposed adjacent to the other end of said pulling portion for cutting the strands to pieces of selected length; first cooling means disposed above the pulling portion of the conveyor band intermediate the ends thereof, said cooling means including discharge means for directing a coolant upon the surface of said pulling portion facing the discharge openings and the strands exposed in the grooves thereof as they pass said discharge openings of the cooling means; and second cooling means disposed for cooling said idling portion of the conveyor band as said portion passes the second cooling means.
Claim 3
Dependent Claim
33 words
The device according to claim 1 wherein said second cooling means comprises a container for a supply of a cooling liquid, the idling portion of the conveyor band being guided through said container.
Claim 4
Dependent Claim
44 words
The device according to claim 1 and comprising a profiled roller pivotally mounted above the pulling portion of the conveyor band, the weight of said roller moving the same toward said pulling portion for holding strands within the grooves provided in the conveyor band.
Claim 5
Dependent Claim
37 words
The device according to claim 1 and comprising drive means coupled to the conveyor band for driving the same at a speed higher than the discharge speed of strands through said discharge openings of the extruder head.
Claim 6
Dependent Claim
46 words
The device according to claim 1 wherein a profiled guide member is disposed between the discharge openings in the extruder head and the pulling portion of the conveyor band for guiding strands emerging from said discharge openings toward said pulling portion and into the grooves therein.
Claim 7
Dependent Claim
18 words
The device according to claim 5 wherein said guide member is in the form of a slanted plate.
Claim 8
Dependent Claim
32 words
The device according to claim 5 wherein said guide member is in the form of a roller rotatable independently of the conveyor band, said roller having circumferential grooves in its peripheral surface.
Claim 9
Dependent Claim
51 words
The device according to claim 1 wherein said conveyor band comprises a multiple V-belt, said belt being disposed with its V-shaped grooves facing said discharge openings, and wherein said conveyor band is guided on and supported by a driving pulley and a guide pulley facing said pulleys with its smooth side.
Claim 10
Dependent Claim
37 words
The device according to claim 1 in which said conveyor band and said first and second cooling means are mounted on a wheeled frame structure, and wherein the extruder head and the granulating means are separately mounted.
References Cited (Backward Citations)
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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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |