| 摘要 |
A target object of the present invention is a plastic paper tube which is doubly extruded. In addition, the purpose of the present invention is to provide extrusion dies by inserting a soft layer on an outer layer of the paper tube and further inserting a hard layer on an inner layer of the paper tube, so as to form a uniform inner and an outer layer. According to the present invention, a waste of high-priced films due to a step phenomenon can be avoided. |
