Patent ID: 6764142
Filing Date: 2004-07-20
Classification: A46B,A46D,Y10T

Abstract:
A method of manufacturing a toothbrush with highly tapered bristles having superior flexibility, comprising the steps of:dipping 3.5 mm-long portions from ends of monofilaments for bristles into erosive chemicals such as sulfuric acid or sodium hydroxide until the dipped portions of the monofilaments are completely eroded; neutralizing the shortened monofilaments prior to rinsing and drying them; attaching the shortened monofilaments on a predetermined portion of a toothbrush; and grinding the shortened monofilaments with the use of a 240# mesh paper rotated at 2600 to 2700 rpm for 3 to 10 sec, a 320# mesh paper rotated at same speed for 3 to 10 sec, and a 400# mesh paper rotated at same speed for 3 to 10 sec.