Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1988-07-05
1990-01-09
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264 51, 264 53, 425204, 425205, B29C 4750, B29C 6722
Patent
active
048926914
ABSTRACT:
A method and apparatus are provided for producing a mixture of plastics materials which are capable of being foamed with propellants. The method permits plastics materials, which require considerably different processing conditions, to be fused, homogenized and mixed with a propellant in an extruder. By feeding a high-molecular weight high-temperature resistant plastics material into the extruder through a first feed opening and subsequently feeding a low-molecular weight, low-temperature-resistant plastics material into the extruder through a second feed opening disposed downstream of the first feed opening but where the first plastics material is in a fused and homogeneous state and by introducing the propellant through a third feed opening downstream of the second feed opening, the desired homogenisation of the two plastics materials and propellant is ensured.
REFERENCES:
patent: 2987774 (1961-06-01), Jacobson
patent: 3522628 (1970-08-01), Eberle et al.
patent: 3817669 (1974-06-01), Buckner
patent: 3856904 (1974-12-01), Ayres
Hermann Berstorff Maschinenbau GmbH
Thurlow Jeffery
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