| 摘要 |
PURPOSE:To enable lightening of an ornamental and to simply obtain the subject bead which facilitates coloring and patterning of an external surface, by a method wherein the outer surface of the bead body made of a foamed resin material is formed with non-foaming skin layer in a silicon mold by a high- frequency heating. CONSTITUTION:A foaming resin material, such as foaming polyvinyl chloride, is extruded by an extruder 20, it is cooled and cured by a cooler 21, and it is cut into a given length by a cutter 22. A cut bead body 23 is placed in a silicon mold 26 consisting of upper and lower molds 24 and 25, and after the mold is clamped, the bead body 23 is charged in a high-frequency molder 28 to mold it by pressurizing and heating to obtain a desired bead 27 having a non-foaming skin layer 29. |
