| 摘要 |
PROBLEM TO BE SOLVED: To suppress the deterioration of a resin by providing a structure electrically insulating a polymer melt part and a die part and preventing the electrolytic deterioration of a molten resin generated by the giving and receiving of electrons between an extruded resin and a die. SOLUTION: An insulating connection pipe 2 having a ceramic coat layer of which the inner surface is subjected to sealing treatment by an inorg. sealant is attached between a polymer melt part 6 having an extruder and a die part 7 produced from carbon steel by combining an adaptor 3 and a bolt 4. As mentioned above, the polymer melt part 6 and the die part 7 are electrically insulated and, since the vicinity of the lower end part of the emitting orifice of the lip inner surface of the die part 7 and the surface coming into contact with the open air of a lip are metal surfaces and have no ceramic coat layer, precise polishing and grinding can be performed by a careful processing method using a diamond grindstone so as to have surface roughness, straightness and an edge angle high in dimensional accuracy necessary for molding a resin film. |
