Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1995-06-07
1997-05-20
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264 51, 425208, 425812, B29C 4400
Patent
active
056309686
ABSTRACT:
A water-injection foaming devolatilizing method includes the steps of: melting and kneading a polymer in a water-injection dispersing zone of an extruder having a screw; injecting water into a polymer melt so as to be dispersed into the polymer melt which is being kneaded; and vaporizing volatile components contained in the polymer melt together with water in a devolatilizing zone having a vent port and located on a downstream side of the water-injection dispersing zone, so that the volatile components are removed and discharged through the vent port. A pressure-reducing expansion zone is provided between the water-injection dispersing zone and the devolatilizing zone so as to be upstream of the vent port. The method further includes gradually reducing a pressure in the pressure-reducing expansion zone so that not only bubbles in the water which is dispersed into the polymer melt are made to grow up, but also the bubbles are broken down at a downstream end portion of the pressure-reducing expansion zone.
REFERENCES:
patent: 3668161 (1972-06-01), Nauman et al.
patent: 4940329 (1990-07-01), Dienst
patent: 5141426 (1992-08-01), Capelle
patent: 5147198 (1992-09-01), Capelle
patent: 5221504 (1993-06-01), Capelle
Hashimoto Noriaki
Wang Ning-He
Kuhns Allan R.
The Japan Steel Works Ltd.
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