Process and a device for preparation of expanded...

Details Process and a device for preparation of expanded... Process and a device for preparation of expanded...

B - Operations, Transporting

29

B

18/639

B29B 13/02 (2006.01) B29C 44/34 (2006.01)

Patent

CA 1329685

ABSTRACT The present invention relates to a method for produc- ing expanded thermoplastic microspheres by heating. Unex- panded microspheres are dried under agitation to a dry solids content exceeding 98% by weight, preferably 99% by weight, before heating. The dried microspheres can be re- wetted and then expanded by heating. The microspheres thus produced contain but minor amounts of agglomerates. The in- vention also comprises an apparatus for expanding the dried spheres. The apparatus has a belt conveyor (A), a device (B) for IR heating, a dosing device (C) for unexpanded spheres, and a collecting device (D) for expanded spheres.

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