抄録
The wettability of molten polymer on stainless steel and coatings was evaluated, for the purpose of improvement of spinnerets for synthetic fibers. The three types of molten polymer (Polypropylene : PP, Nylon-6 : NY-6, Polyethylene Terephthalate : PET) are pushed out upward vertically from a small hole of SUS316 disc by means of a cylinder-piston. The shape of the molten polymer is detected by a CCD camera, and the contact angle values were evaluated. As a result, it was found that, after molten polymers were pushed out for 300 sec., the contact angles provided good reproducibility, with the coefficient of variance of the measurements being about 4%. The contact angles of molten polymer on PVD coatings (Cr-N, Ti-N, Ti-C, Si-C) were in the sequence of Cr-N>SUS316>Ti-N, Ti-C, Si-C for PP at 220ºC, Cr-N>>SUS316, Ti-C, Si-C>Ti-N for NY-6 at 250ºC, Si-C, Ti-N>>Ti-C, Cr-N>>SUS316 for PET at 285ºC.
As a result of XPS measurements, it was suggested that the contact angle of molten PET at 285ºC was influenced by the hydroxyl on the surface on the specimen.
