| 摘要 |
PROBLEM TO BE SOLVED: To provide a toothbrush with bristles made of polytrimethylene terephthalate (PTT) without defective planting of bristles such as irregular bristle length. SOLUTION: The bristles planted in a toothbrush head of the toothbrush are made of polytrimethylene terephthalate (PTT), and the PTT bristles are planted in the toothbrush head by a flat line type planting method. The dynamic friction coefficient on the surface of the PTT bristles is set in the range from 0.50 to 0.70. COPYRIGHT: (C)2005,JPO&NCIPI
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