US 5,301,881 AGranted

System for disposing waste

AssigneeHitachi, Ltd.

InventorsMasakatsu Hayashi, Yoshiyuki Takamura, Tsutomu Hasegawa, Hideharu Mori, Tatsuji Katoh

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Abstract

A waste disposal system includes a stock yard for storing waste articles, a pre-treatment apparatus for separating a metal bulk from each waste article fed from the stock yard, a cryogenic crushing apparatus for crushing the separated metal bulk, and a crushing apparatus for crushing the portion of the waste article other than the metal bulk. The system further includes a light-weight article separating apparatus for separating the crushed waste from said crushing apparatus into foamed material and other wastes, and a foaming agent collecting apparatus which separates the foamed material into solid plastics and gaseous foaming agent and then cools and liquefies the gaseous foaming agent.

Claims23

Dependent claims

A waste disposal system comprising:

a stock yard for storing waste articles comprising a metal bulk and other components;
pre-treatment apparatus including metal bulk separating means for separating said metal bulk from said other components of said waste articles;
a cryogenic crushing apparatus for crushing said metal bulk thus separated by said metal bulk separating means;
a crushing apparatus for crushing said other components of said waste articles into fragments;
a light-weight article separating apparatus for separating said fragments obtained through the crushing performed by said crushing apparatus into fragments of foamed material and other waste;
and
a foaming agent collecting apparatus including a crusher for crushing said fragments of said foamed material separated by light-weight article separating apparatus, a separator for separating the crushed fragments of said foamed material thus crushed by said separator into plastics and a gaseous foaming agent, and a foaming agent cooling device for liquefying said gaseous foaming agent by cooling.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/056,937Filed 5 May 1993 · continuation
Priority: JP 3-3176432 Dec 1991
Granted: 12 Apr 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification47 codes

B29B 17/02
Recovery of plastics or other constituents of waste material containing plastics: separating plastics from other materials
B02C 13/282
Details: shape or inner surface of mill-housings
B02C 18/142
Within horizontal containers: with two or more inter-engaging rotatable cutter assemblies
B02C 19/0056
Other disintegrating devices or methods: specially adapted for specific materials not otherwise provided for