Process for separating the constituents of a mutlilayer material

Details Process for separating the constituents of a mutlilayer material Process for separating the constituents of a mutlilayer material

1997-11-19

1999-08-10

Rosenbaum, Mark

Solid material comminution or disintegration

Processes

With heating or cooling of material

241 2428, B02C 1912

Patent

active

059345772

ABSTRACT:
Process for separating the constituents of a multilayer material including at least one layer of a base plastic (A) and a layer of a plastic (B) which are separated by a layer of adhesive plastic (C), in which: (1) the material is heated to a temperature T1 between the crystallization temperature of the plastic B (Tc) and Tc--20.degree. C., (2) the material is next shredded by being subjected to shearing, at approximately the same temperature, so as to produce delamination and thus to convert the material into particles of small dimensions of two types, some (X) consisting essentially of base plastic (A) and others (Y) consisting essentially of plastic B and of adhesive plastic (C), and (3) the particles X and Y are subsequently separated by electrostatic separation.

REFERENCES:
patent: 4199109 (1980-04-01), Watanabe
patent: 4775697 (1988-10-01), Schoenhard
patent: 5366091 (1994-11-01), Stahl et al.

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