Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Patent
1981-03-09
1983-09-20
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
264512, 264513, B29C 1707, B29D 904
Patent
active
044055579
ABSTRACT:
The conventional process of manufacturing hollow bodies with multi-layer walls using extrusion and blow molding techniques is improved by first making a preform of a thermoplastic carrier layer with an adhesive layer on one or both sides and then applying the additional layer or layers to the adhesive layer(s) in a separate operation. The additional layer(s) has properties different from the carrier layer and serves as an insulation or barrier layer to shield the carrier layer from substances to be contained by or which will surround the hollow body. Among other advantages, the improved process allows recycling of waste and surplus preform material, stronger heat-seal seams in the hollow bodies, less complicated extrusion equipment and more economic use of expensive barrier layer materials.
REFERENCES:
patent: 3900691 (1975-08-01), Marrs et al.
patent: 4079850 (1978-03-01), Suzuki et al.
patent: 4092391 (1978-05-01), Valyi
patent: 4254170 (1981-03-01), Roullet et al.
Kautex Werke Reinold Hagen AG
Silbaugh Jan H.
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