Toothbrush having needle-shaped bristle tapered at one end and manufacturing method thereof

Abstract

A toothbrush tufted with needle-shaped bristles. The bristles are formed of polyester resin. The bristles are 0.1 to 0.2 mm thick before tapering, 13 to 18 mm long, tapered 4 to 8 mm only on one end with a tapered tip thickness of 0.01 to 0.08 mm, and planted to be 7 to 13 mm high in the toothbrush.

1 . A toothbrush comprising: 
 needle-shaped bristles of polyester resin, which are 0.1 to 0.2 mm thick before tapering, 13 to 18 mm long, tapered 4 to 8 mm only on one end with a tapered tip thickness of 0.01 to 0.08 mm, and planted to be 7 to 13 mm high in the toothbrush.    
   
   
       2 . The toothbrush of  claim 1 , wherein the tapered tips of the needle-shaped bristles are 0.01 to 0.03 mm thick.  
   
   
       3 . The toothbrush of  claim 1 , wherein the tapered tips of the needle-shaped bristles are 0.03 to 0.08 mm thick.  
   
   
       4 . The toothbrush of  claim 1 , wherein part of the needle-shaped bristles are 0.01 to 0.03 mm thick in tip thickness and the other needle-shaped bristles are 0.03 to 0.08 mm thick in tip thickness.  
   
   
       5 . The toothbrush of  claim 1 , wherein the needle-shaped bristles are inserted in a head insert and thermally fused to be fixed to the head insert.  
   
   
       6 . The toothbrush of  claim 5 , wherein the head insert having the needle-shaped bristles is mounted in an opening of the head of the toothbrush and attached to the toothbrush head by ultrasonic bonding.  
   
   
       7 . The toothbrush of  claim 1 , wherein the needle-shaped bristles differ in length by 1 to 10 mm.  
   
   
       8 - 16 . (canceled)