Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Producing or treating porous product
Patent
1994-02-17
1996-01-09
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Producing or treating porous product
264 37, 264 464, 264 466, 264 468, B29C 4406, B29C 4412
Patent
active
054826616
ABSTRACT:
In molding bonded plastics material, in particular expanded or foamable polystyrene in combination with rigid sheet polystyrene, the rigid material (2) is firstly preformed in a preforming mold (33, 36) while simultaneously separating by a cutter (40) the preformed portion from the rigid sheet of starting material, the preformed portion is transferred (27) to the molding stage (3) while contained in a preforming half-mold (33), foamable material (44) is fed to and is molded onto the preformed portion with sintering and the pulse action of steam (45), and the molded portion (P) is discharged (6). The preforming half-mold (33) is moved alternately between the preforming position (1) and the molding position (3), and cooperates with respective counter-molds (36,41). The scrap is recovered without being involved in the molding stage.
REFERENCES:
patent: 3950462 (1976-04-01), Shaffer et al.
patent: 4786447 (1988-11-01), Kouda
patent: 4801361 (1989-01-01), Bullard et al.
patent: 5091031 (1992-02-01), Strapazzini
patent: 5284608 (1994-02-01), Vismara
patent: 5326517 (1994-07-01), Yaita et al.
Devi S.p.A.
Kuhns Allan R.
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