Method of molding an elongate foamed resin article from expandab

Details Method of molding an elongate foamed resin article from expandab Method of molding an elongate foamed resin article from expandab

1983-04-05

1985-09-03

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264323, 425 4R, 425 4C, B29D 2700

Patent

active

045391670

ABSTRACT:
This invention relates to a method of and apparatus for moulding from an expandable plastics material such as expandable polystyrene beads, an elongate article which has a length greater than the length of the mould. The method includes the steps of introducing the unexpanded plastic material into a mould, expanding the material in such a manner that the material at one end of the article is not fully expanded, moving the article along the mould partially through an opening in its end, introducing fresh material into the mould to be in contact with the partially expanded material at one end of the article and fully expanding and bonding the fresh and partially expanded material in the contact zone between the two.

REFERENCES:
patent: 3042973 (1962-07-01), Brockhues
patent: 3058162 (1962-10-01), Grabowski
patent: 3086248 (1963-04-01), Culp
patent: 3224039 (1965-12-01), Kracht
patent: 3239880 (1966-03-01), Oxel
patent: 3345442 (1967-10-01), Oxel
patent: 3452390 (1969-07-01), Borcovec
patent: 3537131 (1970-11-01), Kracht et al.
patent: 3832429 (1974-08-01), Charpentier
patent: 3871801 (1975-03-01), Buchmann
Whittington's Dictionary of Plastics by Lloyd R. Whittington, Stamford, Conn., Technomic, .RTM.1968, pp. 59, 60.

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