| 摘要 |
In making a toothbrush of the type having a shaft-like handle (3), a neck section (4) joining said handle and a headpiece (5) for toothbrush bristles (6), said body is made of a first plastic material through an injection moulding step. In order to provide said body with two or more portions (20, 21, 22) made of a second material, e.g., elastic and/or non-slip material such as rubber-like material, or a material having a colour different from that of the first material, the toothbrush body is provided with recess sections (17, 18, 19). Said second material is supplied through a plurality of channels (29, 30, 31, 32) into injection nozzle means (33, 34, 35) to provide injection of said second material in a single step, multi-point injection process into said recesses on said body to form said portions (20, 21, 22), said recesses (17, 18, 19) and said portions (20, 21, 22) thus being physically isolated from each other by said first material.
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