Manufacture of molding

Abstract

Abstract PURPOSE:To prevent wrinkles from occurring, and to make it possible to produce a molding having an appearance good in decorative property, by performing sizing in such a way that a material having a surface tension lower than water is present at least on a surface part of a molded item that will become a glossy part. CONSTITUTION:A first synthetic resin 7a and a second synthetic resin 7b are extruded simultaneously to form a molded item 8. The melting and softening point of the second synthetic resin 7b should be lower than the first synthetic resin 7a and the second synthetic resin 7b should be extruded to be positioned outside of the first synthetic resin 7a. The molded item 8 is placed in a sizing tank 17. A material having a surface tension lower than water such as a surface active agent or the like is supplied from a liquid supplying apparatus 19 onto the surface of the molded item 8, and it is supplied into a sizing apparatus 10. In the sizing apparatus 10, during the passage thereof under liquid supplying holes 11 open to the cylindrical path, the molded item 8 is rectified and cooled by the cooling action and lubricating action of the material 20 jetted from the liquid supplying holes 11. Wrinkles 16 initially formed on the molded item 8 all disappear at the outlet of the sizing apparatus 10, thus the surface of the molded item 8 becomes uniform and smooth, and a glossy part 8a is formed on the second resin 7b.

Inventors

• 👤 Masao Nagana
• 👤 永名　正男
• 👤 Makoto Fujisaki
• 👤 藤崎　真
• 👤 Hiroyuki Nakajima
• 👤 宏之 中島

Bibliographic Details