| 摘要 |
A method of forming an integral piece of toothbrush, comprising firstly forming a toothbrush handle from thermo-plastic material by the process of injection molding to have a head portion longitudinally extending from an elongated hand-hold portion at one end and a concave-convex seat on said head portion and then, inserting said head portion in a cavity inside a molding device, which has a replaceable bristle molding comprised of a plurality of bristle molding elements each of which having a plurality of curved, tapered, unitary projecting strips, to directly mold bristles from thermoplastic material on said concave-convex seat and then, removing the molded toothbrush from said molding device after cooling.
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