Resin granule mass, resin film, separator, sorting device, and sorting method

Abstract

A resin granule mass including multiple resin granules, and a proportion of resin granules to which a magnetic foreign matter of 50 μm or greater is adhered in the multiple resin granules is 30% or less.

1 . A resin granule mass, comprising a plurality of resin granules, wherein a proportion of resin granules to which a magnetic foreign matter of 50 μm or greater is adhered in the plurality of resin granules is 30% or less. 
     
     
         2 . The resin granule mass according to  claim 1 , wherein the resin granules include a polyolefin resin. 
     
     
         3 . The resin granule mass according to  claim 2 , wherein the polyolefin resin is a polyethylene or a polypropylene. 
     
     
         4 . A resin film obtained from the resin granule mass according  claim 1 , wherein a detecting ratio of the magnetic foreign matter having 50 μm or greater is 140 mm 2  or less per 1 m 2  in terms of a thickness of 10 μm. 
     
     
         5 . A separator, comprising the resin film according to  claim 4 . 
     
     
         6 . The separator according to  claim 5 , wherein a detecting ratio of the magnetic foreign matter having 50 μm or greater is 170 mm 2  or less per 1 m 2  in terms of a thickness of 20 μm. 
     
     
         7 . A sorting device, comprising:
 a transport path which is configured to transport resin granules;   a destaticizer which is disposed along the transport path and which supplies ions to the transport path to destaticize the resin granules; and   an adsorption magnet which is disposed along the transport path on a downstream side of the destaticizer and which forms a magnetic field in the transport path to adsorb magnetic foreign matter.   
     
     
         8 . The sorting device according to  claim 7 , further comprising a magnetization magnet which is disposed along the transport path on an upstream side of the adsorption magnet and which forms a magnetic field in the transport path to magnetize magnetic foreign matter included in the resin granules. 
     
     
         9 . The sorting device according to  claim 8 , wherein the destaticizer is disposed on the downstream side of the magnetization magnet. 
     
     
         10 . The sorting device according to  claim 8 , wherein a magnetic flux density of the adsorption magnet is the same as or greater than a magnetic flux density of the magnetization magnet. 
     
     
         11 . The sorting device according to  claim 7 , wherein the transport path has a moving control function that can move the resin granules at a substantially constant amount per unit time. 
     
     
         12 . The sorting device according to  claim 7 , wherein the adsorption magnet extends in a width direction substantially perpendicular to a transport direction of the transport path to form a substantially uniform magnetic field in the width direction. 
     
     
         13 . The sorting device according to  claim 7 ,
 wherein the transport path forms an inclined plane, and   the adsorption magnet adsorbs the magnetic foreign matter when the resin granules flow down the inclined plane.   
     
     
         14 . The sorting device according to  claim 7 ,
 wherein the transport path extends in a vertical direction, and   the adsorption magnet adsorbs the magnetic foreign matter when the resin granules fall in the transport path.   
     
     
         15 . A sorting method of resin granules using the sorting device according to  claim 7 . 
     
     
         16 . The sorting method according to  claim 15 , wherein a wind pressure of air containing ions supplied from the destaticizer in the sorting device is 0.5 MPa or less.