Toothbrush Bristle With A Tapering Part and Toothbrush With Such Bristles

Abstract

Bristle for a toothbrush, comprising a) a cylindrical part ( 1 ) with a maximum, constant cylinder diameter D zyl and b) a tapered part ( 21 ) which adjoins the cylindrical part ( 1 ) and has a bristle end ( 3 ) and has an end face ( 4 ) which de-limits the bristle end ( 3 ), wherein the tapered part ( 21 ) tapers towards the bristle end ( 3 ); wherein the tapered part ( 21 ) has a length L of 10 mm or less and at least 3 mm; characterized in that the tapered part ( 21 ), at a distance X from the end face ( 4 ), which distance X is the same size as the cylinder diameter D zyl , has a diameter D of 95 to 140 μm, and a toothbrush with such bristles.

1 . A bristle for a toothbrush, comprising:
 a cylindrical part with a maximum, constant cylinder diameter D zyl ;   adjacent to the cylindrical part a first tapered part with a bristle end and an end face delimiting the bristle end, whereby the first tapered part tapers towards the bristle end; and   an imaginary central axis which runs through the cylindrical part and the first tapered part and which pierces the end face at a piercing point: whereby the first tapered part has a length L of 10 mm or less and at least 3 mm, as measured on the central axis starting from the piercing point; wherein the first tapered part has a diameter D of 95 to 140 μm, as measured on the central axis starting from the piercing point at a distance X being equal to the cylinder diameter D zyl .   
   
   
       2 . A bristle according to  claim 1 , wherein D is in the range of 100 to 130 μm. 
   
   
       3 . A bristle according to  claim 1 , wherein the first tapered part has a diameter of 120 to 160 μm, as measured on the central axis at a distance of 1 mm from the piercing point, and has a diameter of 90 to 135 μm at a distance of 0.1 mm, as measured in the same way. 
   
   
       4 . A bristle according to  claim 1 , further comprising a second tapered part adjacent to the cylindrical part on a side opposed to the first tapered part. 
   
   
       5 . A bristle according to  claim 4 , wherein the second tapered part has essentially the same shape as the first tapered part. 
   
   
       6 . A bristle according to  claim 1  further comprising a pointed end adjacent to the cylindrical part on the side opposed to the first tapered part. 
   
   
       7 . A bristle according to  claim 1  characterised in that the cylinder diameter D zyl  is in the range of 150 to 170 μm or in the range of 180 to 210 μm. 
   
   
       8 . A bristle according to  claim 1  consisting of polyester or a polyamide. 
   
   
       9 . A bristle according to  claim 1 , consisting of polyethylene terephthalate, polybutylene terephthalate or polyamide-6, 6. 
   
   
       10 . A toothbrush comprising one or more bristles, each bristle comprising:
 a cylindrical part with a maximum, constant cylinder diameter D zyl ;   adjacent to the cylindrical part a first tapered part with a bristle end and an end face delimiting the bristle end, whereby the first tapered part tapers towards the bristle end; and   an imaginary central axis which runs through the cylindrical part and the first tapered part and which pierces the end face at a piercing point; whereby the first tapered part has a length L of 10 mm or less and at least 3 mm, as measured on the central axis starting from the piercing point: wherein   the first tapered part has a diameter D of 95 to 140 μm, as measured on the central axis starting from the piercing point at a distance X being equal to the cylinder diameter D zyl .