抄録
Plastic wastes are expected to use again by recycling.
Cryogenic crushing is one of the techniques for this purpose.
After cryogenic crushing of plastic wastes, most films of them are not crushed and retains their original forms relatively.
So it is too difficult to sieve them. But Trommel shows good screening efficiencies which undergo a trommel's inclination influence rather than its rotatory number. On the contraries, the sizes of separation for films undergo a rotatory number's influence.
