| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of fish eyes by obtaining a fourth synthetic resin material by grinding a second synthetic resin material having a large grain size so as to obtain a grain size smaller than that of a third synthetic resin material having a small grain size, and melting and kneading the fourth and third synthetic resin material for granulation. SOLUTION: A first ground or granulated synthetic resin material A produced at a polymerization plant is classified into two classifications, i.e., a third synthetic resin material B having a smaller grain size and a second synthetic resin material C having a larger grain size. Next, the second synthetic resin material C having a larger grain size is ground into a fourth synthetic resin material D having a grain size smaller than that of the third synthetic resin material B. The third synthetic resin material B having a smaller grain size and so classified is mixed with the fourth synthetic resin material D so ground and having a much smaller grain size. A kneaded synthetic resin material is then melted and kneaded together to be pelletized, thereby eliminating the existence of numelted or non-dispersed grains which cause fish eyes. |
