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US4332932A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for producing a rubber melt in a temperature-controlled screw extruder

Assignee: JSR Corp
•
Filing: 1980-01-15
•
Granted: 1982-06-01
•
Expires: 2000-01-15
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Abstract

Abstract When rubber is melted and decomposed in a screw extruder, a rubber melt can be produced without using a heavy oil with minimized evolution of gas by controlling the extruder cylinder temperature in the decomposing section of the screw within the range of 400 DEG -500 DEG C. and cooling the melt in the discharging section of the screw to a temperature of not more than 250 DEG C. The screw extruder suited for practising this method comprises a screw having a feeding section, a compressing section, a decomposing section and a discharging section which are arranged in that order from the inlet side, and a cylinder assembly consisting of a heating cylinder and a cooling cylinder arranged in that order from the inlet side, said feeding, compressing and decomposing sections of the screw being located corresponding to said heating cylinder, and said discharging section of the screw being located corresponding to said cooling cylinder.

Inventors

  • 👤 Kunihiro Harada
  • 👤 Kiyoshi Kasai
  • 👤 Yoshiki Maki
  • 👤 Norimasa Oda

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 17:08
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/78; B29C48/86; B29C48/87; B29C48/36; B29C48/395; B29C48/40; B29C48/80; B29C48/83; B29C48/832; B29C48/834; B29C48/875; B29C48/03; B29K; B29K2021/00; Y; Y10; Y10S; Y10S528/00; Y10S528/931

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 60 words
A method for producing a rubber melt, comprising: feeding solid rubber into a screw extruder, decomposing said solid rubber in a decomposing section of said screw extruder at a temperature of 400°-500° C. to produce a rubber melt, and cooling said rubber melt to a temperature of not more than 250° C. in a discharging section of said screw extruder.
Claim 2
Independent Claim 60 words
A method for producing a rubber melt, comprising: feeding solid rubber into a screw extruder, decomposing said solid rubber in a decomposing section of said screw extruder at a temperature of 400°-500° C. to produce a rubber melt, and cooling said rubber melt to a temperature of not more than 250° C. in a discharging section of said screw extruder.
Claim 3
Dependent Claim 29 words
A method according to claim 1, wherein the rubber used is automobile tires, commercial rubber products or their waste, or vulcanized or raw scrap rubber produced in rubber plants.
Claim 4
Dependent Claim 19 words
A method according to claim 1, wherein the screw extruder is of either single screw type or twin-screw type.
Claim 5
Dependent Claim 15 words
A method according to claim 1, wherein the screw extruder is of a twin-screw type.
Claim 6
Dependent Claim 38 words
A method according to claim 1, wherein the temperature of the cylinder of said screw extruder corresponding to a feeding section and a compressing section before the decomposing section of said screw extruder is kept at 200°-350° C.
Claim 7
Dependent Claim 18 words
A method according to claim 5, wherein the compressing section is perfectly sealed with the rubber transferred thereto.
Claim 8
Dependent Claim 26 words
A method according to claim 1, wherein the small pieces of rubber are melted together with a heavy oil or the rubber melt in the extruder.
Claim 9
Dependent Claim 24 words
A method according to claim 1 or 3, wherein said rubber melt has a viscosity of not more than 12,000,000 cps. at 100° C.
Claim 10
Dependent Claim 24 words
A method according to claim 1 or 3, wherein said rubber melt has a viscosity of not more than 2,000,000 cps. at 100° C.
Claim 11
Dependent Claim 13 words
A method according to claim 8, wherein said rubber is a vulcanized rubber.
Claim 12
Dependent Claim 13 words
A method according to claim 9, herein said rubber is a vulcanized rubber.

References Cited (Backward Citations)

US2487666A Cited
US2871205A Cited
US3341621A Cited
US3340304A Cited
US3458494A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-05-31 1985-11-30 1986-06-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-05-31 1989-11-30 1990-06-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-05-31 1993-11-30 1994-06-01 $7700.00 Window Closed / Lapsed

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