Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
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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