Process for multilayer blow molding

Details Process for multilayer blow molding Process for multilayer blow molding

1992-12-22

1995-10-24

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

425523, 4251331, 26417127, B29C 4922

Patent

active

054607728

ABSTRACT:
This invention provides a blow molding process for manufacturing multilayer hollow articles having sections different from one another in respect to the kind of resins, number of layers, and thickness of layers along the circumference in the horizontal section of an article with the narrowest of the sections in any one of the resin layers extending in a specified width along the longitudinal wall of an article and being capable of satisfying the sectional performance requirements, an apparatus, and said hollow articles. It also provides a process for manufacturing multilayer hollow articles with the wall thickness ratio of resin layers in each section varying along the longitudinal wall of an article or those with the sectional width in each resin layer varying along the longitudinal wall of an article, an apparatus, and said hollow articles. Hollow articles molded by the process and apparatus of this invention are particularly useful for automotive bumpers, the seats and backs of chairs, and boiler-room doors.

REFERENCES:
patent: 3221371 (1965-12-01), Stevens
patent: 3257482 (1966-06-01), Schechter
patent: 3697632 (1972-10-01), Tenner
patent: 3737263 (1973-06-01), Schrenk et al.
patent: 3825036 (1974-07-01), Stent
patent: 4063865 (1977-12-01), Becker
patent: 4182582 (1980-01-01), Youval et al.
patent: 4907957 (1990-03-01), Nakagawa et al.
patent: 5133911 (1992-07-01), Kagitani
Patent Abstracts of Japan, vol. 10, No. 189, Jul. 3, 1985 of JP61-32733, Feb. 15, 1986.

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