US3792950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pelletizing apparatus
Assignee: Cumberland Engineering Corp
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Filing: 1972-09-08
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Granted: 1974-02-19
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Expires: 1992-09-08
Abstract
Abstract Apparatus for pelletizing synthetic plastic resins, comprising an extruding die assembly having extrusion orifice sleeves pervious to liquid, a water jacket surrounding each sleeve in such manner that water will pass through the walls thereof to chill plastic being extruded therethrough while at the same time lubricating passage of the plastic therethrough. Severing means are provided at the die face for cutting the plastic into pellets as it is extruded. Optionally means are provided for collecting the pellets such as a casing that surrounds the die and the cutting means.
Inventors
- 👤 D Cuff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:23
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/02; B29B9/06; B29B9/065; B29B7/00; B29B7/30; B29B7/58; B29B7/582; B29B7/80; B29B7/82; B29B7/826; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/25; B29C48/30; B29C48/345; B29C2793/00; B29C2793/009; B29C48/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
171 words
A die-type pelletizing apparatus for synthetic plastic comprising: a base; a die adaptor mounted on the base and having inlet and outlet portions; an extrusion die mounted on the outlet portion of said adaptor and having inner and outer die faces; conducting means in the adaptor for conducting hot plastic from the inlet portion thereof to the extrusion die; a plurality of extrusion bores in said extrusion die extending between the latter''s inner and outer faces; bushings having walls pervious to a liquid and mounted in said bores, each bushing having an extrusion passage therethrough; first means for supplying a cooling liquid to at least a portion of the outer surface of said bushings within said extrusion bores thereby to cause the liquid to pass through said bushings into the extrusion passages thereof to engage the surface of plastic being extruded through the bushings; and cutting means movably mounted adjacent said outer die face for severing extruded plastic material as it emerges from said extrusion passages, thereby to pelletize said material.
Claim 2
Dependent Claim
171 words
A die-type pelletizing apparatus for synthetic plastic comprising: a base; a die adaptor mounted on the base and having inlet and outlet portions; an extrusion die mounted on the outlet portion of said adaptor and having inner and outer die faces; conducting means in the adaptor for conducting hot plastic from the inlet portion thereof to the extrusion die; a plurality of extrusion bores in said extrusion die extending between the latter''s inner and outer faces; bushings having walls pervious to a liquid and mounted in said bores, each bushing having an extrusion passage therethrough; first means for supplying a cooling liquid to at least a portion of the outer surface of said bushings within said extrusion bores thereby to cause the liquid to pass through said bushings into the extrusion passages thereof to engage the surface of plastic being extruded through the bushings; and cutting means movably mounted adjacent said outer die face for severing extruded plastic material as it emerges from said extrusion passages, thereby to pelletize said material.
Claim 3
Dependent Claim
29 words
The apparatus of claim 1 in which said first means is adapted to receive said liquid at a pressure greater than the plastic being extruded through the extrusion passageways.
Claim 4
Dependent Claim
26 words
The apparatus of claim 1 including third means for heating an inner portion of the length of each bushing adjacent the outlet portion of said adaptor.
Claim 5
Dependent Claim
42 words
The apparatus of claim 1 including a casing, closure means for the casing at one end thereof, and said adaptor comprising a closure means for the other end of the casing, the pellets when cut from the plastic falling into said casing.
Claim 6
Dependent Claim
16 words
The apparatus of claim 1, in which said bushings are detachably fastened into said extrusion bores.
Claim 7
Dependent Claim
63 words
The apparatus of claim 3, in which said third means comprises a pair of fluid receiving channels one on each side of the inner ends of said extrusion bores, the channels being interconnected between the bores, and said inner portions of the lengths of the bushings being in thermal conductivity with the die body portions forming the inner ends of the extrusion bores.
Claim 8
Dependent Claim
48 words
The apparatus of claim 1 in which said first means comprises a channel in said extrusion die surrounding said portion of each of said bushings, the channel having inlet means whereby said fluid may be introduced into the channel in order to surround each bushing with said fluid.
Claim 9
Dependent Claim
36 words
The apparatus of claim 1 in which said cutting means comprises at least one knife which traverses the outer face of the extrusion die as the knife moves, and including drive means to move the knife.
Claim 10
Dependent Claim
24 words
The apparatus of claim 8, in which said knife does not touch the external face of the extrusion die but is closely adjacent thereto.
Claim 11
Dependent Claim
14 words
The apparatus of claim 6, in which said channels include inlet and outlet means.
Claim 12
Dependent Claim
126 words
An extrusion die assembly for pelletizing plastic, including: a die member having a compression face and an expansion face; a plurality of extrusion bores in said die member extending between said faces; bushings having walls pervious to a liquid and mounted in said extrusion bores, each bushing having an extrusion passageway therethrough; first means for supplying a cooling liquid to the outer surface of said bushings within said extrusion bores thereby to cause the liquid to pass through said bushings into the extrusion passageways thereof to engage the surface of plastic being extruded through said bushings; and cutting means movably mountEd adjacent the expansion face of the die member for severing extruded plastic material as it emerges from said extrusion passageways, thereby to pelletize said material.
Claim 13
Dependent Claim
126 words
An extrusion die assembly for pelletizing plastic, including: a die member having a compression face and an expansion face; a plurality of extrusion bores in said die member extending between said faces; bushings having walls pervious to a liquid and mounted in said extrusion bores, each bushing having an extrusion passageway therethrough; first means for supplying a cooling liquid to the outer surface of said bushings within said extrusion bores thereby to cause the liquid to pass through said bushings into the extrusion passageways thereof to engage the surface of plastic being extruded through said bushings; and cutting means movably mountEd adjacent the expansion face of the die member for severing extruded plastic material as it emerges from said extrusion passageways, thereby to pelletize said material.
Claim 14
Dependent Claim
30 words
The extrusion die of claim 11 in which said first means is adapted to receive said liquid at a pressure greater than the plastic being extruded through the extrusion passageways.
Claim 15
Dependent Claim
24 words
The die assembly of claim 11, including third means for heating an inner portion of the length of each bushing adjacent said compression face.
Claim 16
Dependent Claim
17 words
The die assembly of claim 11, in which said bushings are detachably fastened into said extrusion bores.
Claim 17
Dependent Claim
30 words
The die assembly of claim 11, in which said first means comprises a channel in the extrusion die enveloping said bushings, and having an inlet thereto for receiving said fluid.
Claim 18
Dependent Claim
68 words
The die assembly of claim 13, in which said third means comprises a pair of fluid receiving channels one on each side of said extrusion bores and in proximity to said compression face, the channels being interconnected between the bores, and said inner portions of the lengths of said bushings being in thermal conductivity with the die body portions forming the inner end portions of said extrusion bores.
Claim 19
Dependent Claim
26 words
The die assembly of claim 13, including inlet and outlet means for the channels, adapted to introduce and remove a hot heating fluid from said channels.
Claim 20
Dependent Claim
14 words
The die assembly of claim 15, including fluid receiving inlet means for said channel.
Claim 21
Dependent Claim
28 words
The die assembly of claim 11 in which the expansion face of the extrusion die is cylindrical and said bores extend radially with respect to the cylindrical face.
Claim 22
Dependent Claim
26 words
The die assembly of claim 11 in which the expansion face of the extrusion die is planar, and said bores are perpendicular to the expansion face.
Claim 23
Dependent Claim
17 words
The die assembly of claim 19 in which said bushings are detachably fastened into the extrusion bores.
Claim 24
Dependent Claim
17 words
The die assembly of claim 20 in which the bushings are detachably fastened into the extrusion bores.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |