Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Patent
1990-09-19
1992-03-10
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
156180, 156242, 264518, 264101, 264112, 264122, 264128, 264257, B29C 4356
Patent
active
050947982
ABSTRACT:
In the manufacture of lightweight structural profile including a resin-bonded core of closely compacted particulate filler, loose filler is packed into a shaping die by means of applied vacuum. The filler is packing within a sheath of glass rovings which is used to draw the packed filler through the die. As the sheath and packed filler are progressed through the die, a liquid bonding resin is introduced to permeate and bond together the packed filler and the sheath. The filler includes layer mineral foam in a coarse particulate form and a free-flowing relatively fine material (such as hollow silicate microspheres) as an additional filler, the additional filler being vacuumed in to occupy the interstices of previously packed foam filler.
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patent: 3377220 (1968-04-01), Berger et al.
patent: 3869334 (1975-03-01), Hughes et al.
patent: 3895896 (1975-07-01), White et al.
patent: 4146564 (1979-03-01), Garrick et al.
patent: 4166090 (1979-08-01), Green et al.
patent: 4645631 (1987-02-01), Hegenstaller et al.
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