Solid material comminution or disintegration – Processes – With classifying or separating of material
Patent
1991-05-21
1992-09-22
Watts, Douglas D.
Solid material comminution or disintegration
Processes
With classifying or separating of material
241 791, 241DIG38, B28B 1700, B03B 906
Patent
active
051489937
ABSTRACT:
A method for recycling treatment of refuse of plastic molded articles, e.g. polyethylene terephthalate bottles comprises immersing the refuse into hot water of 70.degree.-100.degree. C. while agitating to detach and remove bottom coverings of dissimilar plastics, detaching paper labels on the plastic articles by steam injection, breaking the detached labels and the plastic articles into fragments, separating the mixture by wind-force sorting to remove most of the labels, further separating the fragments of plastic articles and residual labels by flying sorting to obtain the fragments only of the plastic articles, cleaning the fragments of the plastic articles by ultrasonic energy to remove all impurities, and preparing the purified plastic articles as chip or pellet plastic material. Apparatus for performing the method is characterized by comprising a hot water tank and push impellers for immersing and agitating the refuse in hot water to detach and remove the coverings, a steam injection machine and an agitator for injecting steam against the labels to detach them, a wind-force separator and a flying separator for separating out the labels completely to obtain fragments only of the plastic articles, the former having guide plates and a blower, the latter having a flying rotary bar with fin members. The push impellers are of a square drum having vane-like projections.
REFERENCES:
patent: 3741863 (1973-06-01), Brooks
patent: 4043513 (1977-08-01), Hoberg et al.
patent: 4094272 (1978-06-01), Hillekamp et al.
patent: 4932595 (1990-06-01), Cohen et al.
patent: 5060870 (1991-10-01), Trezek et al.
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