Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1981-01-09
1983-04-05
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
198661, 198664, 264 37, 264DIG9, 406 56, 432 13, 432 58, 432118, B29D 2700, F27B 918
Patent
active
043791069
ABSTRACT:
The steam expander conveys the expanding heat expandable thermoplastic elements along a horizontal axis using a plurality of paddle frames. The paddle frames serve to agitate and tumble the elements during movement from an inlet to an outlet. At the same time, steam is injected into the housing of the expander to expand the elements. The expanded elements can be drawn off via a vacuum line to an overhead hopper or hoppers.
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