Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1998-03-05
1999-12-28
Mosley, Terressa
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264 51, 425208, 425812, 528499, C04B 3332, C08F 600
Patent
active
060077492
ABSTRACT:
A water injection foaming devolatilizing method, and an apparatus for practicing the method according to the invention are designed as follows: A molten polymer material is kneaded in a water-injection dispersion zone (11) of an extruding machine having a pair of screws (6) each of which is turned in the same direction. Water is supplied to the molten polymer material, thus the water being dispersed therein while the molten polymer material is kneaded. In a devolatilizing zone (12) downstream of the water-injection dispersion zone, the volatile components in the molten polymer material are removed by being gasified together with the water. In this water injection foaming devolatilizing method, the molten polymer material is smoothly extruded from the filling zone (10) to the water-injection dispersion zone (11), and in the latter zone (11) water injection is performed with increased pressure due to the aid of a ring (15), thereby to achieve the devolatilizing of the molten polymer material.
REFERENCES:
patent: 5630968 (1997-05-01), Wang et al.
Kimura Yoshitaka
Mizuguchi Hideki
Oda Norimasa
Takamoto Seiji
Wang Ning-He
Mosley Terressa
The Japan Steel Works Ltd.
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