Patent ID: 8297710
Filing Date: 2012-10-30
Classification: A46B,A46D,B29C,B29L

Abstract:
1. A method for manufacturing a toothbrush with the following steps: (a) providing bristles made of a thermoplastic resin; (b) wherein at least some of the bristles comprise tapered bristles with a sectional shape having an islands in a sea structure wherein a core bristle having a plurality of island portions exposed beforehand at a free end, and (c) subsequently inserting a tuft comprising a plurality of the bristles into tufts holding holes formed in a first mold member from a front end side of the bristles against an opposite side from a cavity side, then bringing a free end portion of the tuft in contact with a backplate, setting a brushing surface formed by end portions of the bristles at a predetermined shape, heat melting a base end of the tuft to form a thick portion comprising a fused mass at the base end of the tuft, then mounting the thick portion in such that the tuft is fusion-bonded to a bristle base, and forming a brush main body made of a synthetic resin with the bristle base in molds.