Patent US4100244A successfully refreshed from Google Patents.
US4100244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for directly cooling melted thermoplastic resins
Assignee: Japan Steel Works Ltd
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Filing: 1974-11-01
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Granted: 1978-07-11
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Expires: 1994-11-01
Abstract
Abstract Direct cooling of melted thermoplastic resins, while in a continuous extruding operation, can be achieved, by pouring into them a coolant such as pure water, liquid nitrogen or the like in the cooling region of the continuous extruder so that the resins are directly cooled by the latent heat of the coolant or the temperature difference between the resins and the coolant.
Inventors
- 👤 Hidehiro Nonaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:22
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/78; B29C48/80; B29C48/83; B29C48/834; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/428; B29B7/429; B29B7/80; B29B7/82; B29B7/84; B29B7/845; B29C48/285; B29C48/29; B29C48/36; B29C48/50; B29C48/76; B29C48/765; B29C48/766; B29C48/767; B29C48/82; B29C48/03; B29C48/762; B29K; B29K2105/00; B29K2105/0005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
241 words
Method of cooling melted thermoplastic resin in a continuous extruder having a primary mixing zone and a final mixing zone, which comprises directly injecting a coolant having a lower boiling point than said thermoplastic resin and being inactive to said resin, into the melted thermoplastic resin while mixing the resin in the primary mixing zone of the extruder at a temperature in the range of about 175° C, injecting said coolant at a temperature sufficiently lower than said melted thermoplastic resin and cooling said melted thermoplastic resin to a temperature in the range of about 130° C to 156° C before entrance into the final mixing zone of the extruder; said coolant being injected through a coolant inlet injection orifice formed in the wall of said extruder downstream of the resin inlet and said coolant being injected at a definite weight ratio of about 6.8 to 13.4 percent relative to the extruded thermoplastic resin, said extruder having a coolant vent orifice arranged downstream of said coolant inlet in the primary mixing zone of said extruder, and said extruder further being provided with an external indirect cooling jacket; uniformly mixing said coolant with said thermoplastic resin in said primary mixing zone; and removing said coolant through said coolant vent orifice before mixing the cooled thermoplastic resin in the final mixing zone of the extruder with indirect cooling through said cooling jacket and recovering the cooled mixed resin from said final mixing zone.
Claim 2
Dependent Claim
241 words
Method of cooling melted thermoplastic resin in a continuous extruder having a primary mixing zone and a final mixing zone, which comprises directly injecting a coolant having a lower boiling point than said thermoplastic resin and being inactive to said resin, into the melted thermoplastic resin while mixing the resin in the primary mixing zone of the extruder at a temperature in the range of about 175° C, injecting said coolant at a temperature sufficiently lower than said melted thermoplastic resin and cooling said melted thermoplastic resin to a temperature in the range of about 130° C to 156° C before entrance into the final mixing zone of the extruder; said coolant being injected through a coolant inlet injection orifice formed in the wall of said extruder downstream of the resin inlet and said coolant being injected at a definite weight ratio of about 6.8 to 13.4 percent relative to the extruded thermoplastic resin, said extruder having a coolant vent orifice arranged downstream of said coolant inlet in the primary mixing zone of said extruder, and said extruder further being provided with an external indirect cooling jacket; uniformly mixing said coolant with said thermoplastic resin in said primary mixing zone; and removing said coolant through said coolant vent orifice before mixing the cooled thermoplastic resin in the final mixing zone of the extruder with indirect cooling through said cooling jacket and recovering the cooled mixed resin from said final mixing zone.
Claim 3
Dependent Claim
11 words
Method according to claim 1, wherein said coolant is liquid nitrogen.
Claim 4
Dependent Claim
10 words
Method according to claim 1, wherein said resin is polyethylene.
Claim 5
Dependent Claim
13 words
Method according to claim 1, wherein said cooling jacket is cooled by water.
Claim 6
Dependent Claim
224 words
Method of cooling melted polyethylene thermoplastic resin in a continuous extruder having a primary mixing zone, a final mixing zone, a coolant inlet orifice from injecting coolant into said primary mixing zone, and a vent orifice downstream of said coolant inlet orifice in said primary mixing zone, which comprises continuously charging said melted resin to the primary mixing zone at a temperature of said resin in the range of about 175° C; selecting an inactive coolant having a lower boiling point than that of said melted resin; directly injecting said coolant into said melted resin through said coolant inlet orifice while continuously mixing said resin in the primary mixing zone, and maintaining said coolant at a temperature substantially lower than that of said melted resin and cooling said melted resin to a temperature of about 130° C to 156° C adjacent to the vent orifice in the primary mixing zone of said extruder, the injection of coolant into the melted resin in the primary mixing zone of the extruder being carried out at a constant weight ratio of about 6.8% to about 13.4% relative to the extruded polyethylene resin; thoroughly mixing said coolant with said melted polyethylene resin in said primary mixing zone; and removing said coolant through said vent before recovering the cooled polyethylene resin from the final mixing zone of the extruder.
Claim 7
Dependent Claim
224 words
Method of cooling melted polyethylene thermoplastic resin in a continuous extruder having a primary mixing zone, a final mixing zone, a coolant inlet orifice from injecting coolant into said primary mixing zone, and a vent orifice downstream of said coolant inlet orifice in said primary mixing zone, which comprises continuously charging said melted resin to the primary mixing zone at a temperature of said resin in the range of about 175° C; selecting an inactive coolant having a lower boiling point than that of said melted resin; directly injecting said coolant into said melted resin through said coolant inlet orifice while continuously mixing said resin in the primary mixing zone, and maintaining said coolant at a temperature substantially lower than that of said melted resin and cooling said melted resin to a temperature of about 130° C to 156° C adjacent to the vent orifice in the primary mixing zone of said extruder, the injection of coolant into the melted resin in the primary mixing zone of the extruder being carried out at a constant weight ratio of about 6.8% to about 13.4% relative to the extruded polyethylene resin; thoroughly mixing said coolant with said melted polyethylene resin in said primary mixing zone; and removing said coolant through said vent before recovering the cooled polyethylene resin from the final mixing zone of the extruder.
Claim 8
Dependent Claim
10 words
Method according to claim 5, wherein said coolant is water.
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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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |