US4038002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pelletizer
Assignee: Toyobo Co Ltd
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Filing: 1974-12-24
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Granted: 1977-07-26
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Expires: 1994-12-24
Abstract
Abstract A vertical underwater type pelletizer-cutter apparatus utilizing a hydraulic suction force for pelletization of thermoplastic polymers comprising a nozzle portion having a plurality of nozzles through which a thermoplastic polymer in a melt state is extruded in strands, an injector portion having a plurality of injectors through which the strands are introduced with water, a cooling portion comprising a plurality of guide tubes through which the strands pass together with said water which cools and solidifies the same and a cutter portion which cuts the cooled and solidified strands into pellets, wherein means are provided for monitoring the pressure at the space in the upper part of the guide tube and for automatically stopping the extrusion of the thermoplastic polymer when the monitoring means detects an abnormal reduction in the pressure.
Inventors
- 👤 Yoshio Inaba
- 👤 Takashi Hisagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:03
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/02; B29B9/06; B29B9/065
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
192 words
A substantially vertically disposed pelletizer apparatus utilizing a hydraulic suction force for the pelletization of a thermoplastic polymer which comprises a plurality of nozzle means for extruding a thermoplastic polymer in a melt state into strands, a plurality of injector means disposed below corresponding nozzle means, said injector means receiving the strands from the nozzle means, and provided with means for introducing water and air together with said strands, a plurality of guide tubes disposed below corresponding injector means, said guide tubes defining a space therein for receiving said strands and water-air mixture, said water cooling and solidifying the strands during their travel through said guide tubes, a cutter means disposed below the guide tubes for cutting the cooled and solidified strands, and an automatic control system for controlling the amount of thermoplastic polymer extruded through the nozzle means, said automatic control system including means for sensing the air pressure of the space in the upper portion of the guide tubes and control means connected to said sensing means for controlling the extrusion of the thermoplastic polymer through the nozzle, said control means being responsive to the operation of the sensing means.
Claim 2
Dependent Claim
192 words
A substantially vertically disposed pelletizer apparatus utilizing a hydraulic suction force for the pelletization of a thermoplastic polymer which comprises a plurality of nozzle means for extruding a thermoplastic polymer in a melt state into strands, a plurality of injector means disposed below corresponding nozzle means, said injector means receiving the strands from the nozzle means, and provided with means for introducing water and air together with said strands, a plurality of guide tubes disposed below corresponding injector means, said guide tubes defining a space therein for receiving said strands and water-air mixture, said water cooling and solidifying the strands during their travel through said guide tubes, a cutter means disposed below the guide tubes for cutting the cooled and solidified strands, and an automatic control system for controlling the amount of thermoplastic polymer extruded through the nozzle means, said automatic control system including means for sensing the air pressure of the space in the upper portion of the guide tubes and control means connected to said sensing means for controlling the extrusion of the thermoplastic polymer through the nozzle, said control means being responsive to the operation of the sensing means.
Claim 3
Dependent Claim
14 words
The apparatus of claim 1, wherein heating means are associated with the nozzle means.
Claim 4
Dependent Claim
15 words
The apparatus of claim 1, wherein the nozzle means are disposed in a circular array.
Claim 5
Dependent Claim
20 words
The apparatus of claim 1, wherein the means for introducing water and air into the injector means comprises guide fins.
Claim 6
Dependent Claim
29 words
The apparatus of claim 1, wherein the control means of the automatic control system is a valve means which is connected to the sensing means by an electrical circuit.
Claim 7
Dependent Claim
25 words
The apparatus of claim 5, wherein the sensing means includes a tube provided with a vacuum pressure switch, said tube communicating with the guide tube.
Claim 8
Dependent Claim
30 words
The apparatus of claim 6, wherein the sensing means detects a pressure change in the guide tube produced by an abnormal accumulation of the thermoplastic polymer at the injector means.
References Cited (Backward Citations)
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US3436449A
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US3526926A
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US3689610A
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US3600745A
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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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |