Method and apparatus for hermetic pneumatic rapid preforming of

Details Method and apparatus for hermetic pneumatic rapid preforming of Method and apparatus for hermetic pneumatic rapid preforming of

1993-07-01

1994-12-27

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Bulk deposition of particles by differential fluid pressure

264121, 264122, 264128, 425 801, B29C 4302

Patent

active

053763270

ABSTRACT:
A method and apparatus of forming a preform (12) of structural fibers (14) includes a hermetically sealed housing (18) for controlling air pressures and flow therein. A perforated screen (28) is located within the housing (18) separating same into a high pressure chamber (34) and a low pressure chamber (36). Pressurized air is supplied to the high pressure chamber (34) to agitate and randomize fibers (14), and a vacuum (26) is provided in the low pressure chamber (36) to draw and compact the fibers against the screen (28). The pressure differential between the chambers (34, 36) provides significant compaction of the fibers against the screen. A binder (16) is applied to the fibers (14) to maintain the shape of the preform.

REFERENCES:
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patent: 2725601 (1955-12-01), Brenner
patent: 2929436 (1960-03-01), Hampshire
patent: 3177275 (1965-04-01), Brenner
patent: 3494991 (1970-02-01), Mazzio et al.
patent: 5039465 (1991-08-01), Freeman et al.
patent: 5217672 (1993-06-01), Kelman et al.
patent: 5229052 (1993-07-01), Billiu

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