Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1985-05-13
1986-10-07
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
138118, 138177, 138DIG7, 239145, 264 41, 264 451, 264 453, 264 459, 26433113, 405 45, 521 81, 524495, 524528, C08L 900
Patent
active
046160558
ABSTRACT:
A mixture of virgin crumb rubber sized to between 30 mesh and 100 mesh containing less than 5%+100 fines and thermoplastic binder, such as carbon black filled polyethylene containing a coating promoter, such as a citrate salt and lubricant, such as a calcium stearate, is mixed in a vented Banburg mixer heated to at least 350.degree. F. to remove volatiles through vent before extrusion. The mixture is formed into sheet in the nip of a two roll assembly and cooled in air before diced into pellets by a dicer.
The pellets are formed into porous pipe by extrusion in a pipe extruder having the feeding, transition and metering zones separately heated to temperatures from 320.degree. F. to 400.degree. F. (T.sub.1, T.sub.2, T.sub.3). The die has a separate jacket receiving heat exchange fluid for heating the die to a temperature from 290.degree. F. to 380.degree. F. to form a porous pipe having more uniformly spaced and sized pores and a smoother inner wall surface. The linearity factor, tensile strength and elongation are also improved.
REFERENCES:
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patent: 4013102 (1977-03-01), DeLorean et al.
patent: 4094466 (1978-06-01), DeRomano
patent: 4162863 (1979-07-01), Guadard et al.
patent: 4168799 (1979-09-01), Turner
patent: 4238260 (1980-12-01), Washkewicz
patent: 4434250 (1984-02-01), Kessler
patent: 4517316 (1985-05-01), Mason
Dasurat Enterprises PTE Ltd.
Jacobs Marvin E.
Welsh Maurice J.
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