Toothbrush and method for manufacturing toothbrush

Abstract

Provided are a toothbrush in which a tapered surface is formed on a tip part of synthetic resin fibers forming a brush and a fiber surface including the fiber tip part is coated with minerals and the toothbrush is provided with a bristle tip (fiber) having appropriate bending strength, and a manufacturing method of the toothbrush. The toothbrush 1 includes a brush in which a mineral component layer is formed on a surface of a synthetic resin fiber 4. The synthetic resin fiber 4 a having a tapered surface 4 a 1 which is formed in a range of 1 mm to 8 mm from a tip occupies 90% or more of the synthetic resin fibers 4 ( 4 a, 4 b ), and bending strength of the brush at a position of 1 mm from a leading edge of the brush 3 (the synthetic resin fibers 4 ( 4 a, 4 b )) is 0.60 N/cm 2 to 2.00 N/cm 2 .

1 . A toothbrush comprising:
 a brush in which a mineral component layer is formed on a surface of a synthetic resin fiber, wherein   a tapered surface is formed on the synthetic resin fiber in a range of 1 mm to 8 mm from a tip and the synthetic resin fiber having the tapered surface occupies 90% or more of the synthetic resin fibers forming the brush, and   bending strength of the brush at a position of 1 mm from a leading edge of the brush is 0.60 N/cm 2  to 2.00 N/cm 2 .   
     
     
         2 . The toothbrush according to  claim 1 , wherein irregularities are formed on the tapered surface. 
     
     
         3 . A manufacturing method of the toothbrush according to  claim 1 , comprising the steps of:
 bundling the synthetic resin fibers to produce a synthetic resin fiber assembly;   immersing the synthetic resin fiber assembly in a solution bath in which a soluble liquid is accommodated;   moving the synthetic resin fiber assembly up and down from an upper side of a polishing/rubbing body;   making the synthetic resin fiber assembly come into contact with a polishing/rubbing blade for a predetermined time;   dissolving and swelling a surface of the synthetic resin fiber; and   scrubbing off the surface of the synthetic resin fiber by the polishing/rubbing blade, to form the tapered surface.   
     
     
         4 . The manufacturing method of the toothbrush according to  claim 3 , wherein
 after the step of forming the tapered surface, the synthetic resin fiber assembly is immersed in mineral water to form a mineral component layer.