METHOD AND FACILITY FOR SORTING AND SEPARATING WASTE PLASTIC

Title:

METHOD AND FACILITY FOR SORTING AND SEPARATING WASTE PLASTIC

Document Type and Number:

WIPO Patent Application WO/2011/040317

Kind Code:

A1

Abstract:

Disclosed is a facility for precisely sorting, by material, waste plastic that includes many types of material. Said facility is provided with: a crusher (11) that pulverizes a waste plastic feedstock into waste plastic fragments having a prescribed size; a steam-cleaning device (13) that is disposed downstream from the crusher and that cleans the waste plastic fragments; a primary wet specific-gravity sorter (14) and a secondary wet specific-gravity sorter (15) that are disposed downstream from the steam-cleaning device and that use separation liquids, which have specific gravities in the middle of the specific gravities of the materials included in the waste plastic fragments, to separate out at most three types of floating or sinking specific-gravity-sorted fragments; and first through third electrostatic separation devices (16A-16C), each of which is disposed downstream of the primary and secondary wet specific-gravity sorters and has a frictional charging device, which frictionally charges the specific-gravity-sorted fragments, and an electrostatic sorter that puts the frictionally-charged specific-gravity-sorted fragments in an electrostatic field between a rotating drum electrode to which a high voltage is applied and an opposing electrode, thereby changing the direction the fragments fall and separating said fragments by material.

Inventors:

ANDO KAZUO
INOUE TETSUYA
NIWA TSUTOMU

Application Number:

PCT/JP2010/066481

Publication Date:

April 07, 2011

Filing Date:

September 24, 2010

Export Citation:

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Assignee:

HITACHI SHIPBUILDING ENG CO (JP)
KYOWA SANGYO CO LTD (JP)
ANDO KAZUO
INOUE TETSUYA
NIWA TSUTOMU
ITOGA TAKESHI

International Classes:

B29B17/00; B03B5/36; B03B9/06; B03C7/02; B03C7/06; B29B17/04

Foreign References:

JPH0847926A	1996-02-20
JP2000342998A	2000-12-12
JP2008194625A	2008-08-28
JPS59138450U	1984-09-14
JP2003071837A	2003-03-12

Other References: