Method for tapering bristle of a toothbrush by a mechanical method

Abstract

A method for tapering the bristle of a toothbrush using grinding drums which have protrusions with a height of between 1.5 to 7.0 mm, and which rotate in the vertical and horizontal directions. The method includes a step of connecting the grinding drums in parallel, such that the grinding drums are arranged in sequence wherein the heights of the protrusions of each of the grinding drums are gradually decreased, and a step of enabling the toothbrush with a non-tapered bristle to pass through each of the grinding drums in series such that the bristle can be ground. The method of the present invention produces highly tapered bristle having a tapered length of 5 mm or longer and an end thickness of 0.02 mm or less even without immersing the bristle into chemicals, and prevents thermal deformations which may otherwise occur in the tapering process performed by a mechanical method.

1 . A method of tapering a bristle of a toothbrush using grinding drums which have protrusions with heights of 1.5 millimeters to 7.0 millimeters and which rotate in vertical and horizontal directions, wherein the grinding drums are connected to each other in parallel and are arranged such that the height of the protrusions formed on each of the grinding drums is sequentially decreased, and a toothbrush having a non-tapered ordinary bristle passes through the grinding drums sequentially, thus continuously grinding the bristle. 
     
     
         2 . The method according to  claim 1 , wherein each of the grinding drums has a vertical rotating speed of 200 revolutions per minute to 500 revolutions per minute. 
     
     
         3 . The method according to  claim 2 , wherein each of the grinding drums has a vertical rotating speed of 250 revolutions per minute to 480 revolutions per minute. 
     
     
         4 . The method according to  claim 1 , wherein a number of the arranged grinding drums is between 15 and 30. 
     
     
         5 . The method according to  claim 1 , wherein each of the grinding drums reciprocates by a distance of 5 centimeters to 10 centimeters in a direction perpendicular to a direction of movement of the toothbrush. 
     
     
         6 . The method according to  claim 1 , wherein each of the grinding drums is positioned such that an end of the bristle of the toothbrush is in contact with a bottom between the protrusions.