Brush bristle material, brush using same, and manufacturing method for said brush bristle material

Abstract

Provided is a brush bristle material, wherein island parts are exposed at one end or both ends in the lengthwise direction of a sea-island composite fiber comprising at least two types of resin havingdifferent drug dissolution rates, said brush bristle material being characterized in that: the sea-island composite fiber has a plurality of edged island parts having an edge-equipped cross-sectionalshape near the outer peripheral surface of the sea-island composite fiber; an outer peripheral surface forming part that forms the outer peripheral surface of the sea-island composite fiber is solelyconstituted by the sea part; and, in a cross-section of the sea-island composite fiber, the ratio Ts / Di, which is the ratio of the thickness Ts of the sea part of the outer peripheral surface formingpart to the diameter Di of the circumscribed circle of the edged island parts nearest to the outer peripheral surface forming part, is at least 0.3. Further provided are a brush using the brush bristle material and a manufacturing method for the brush bristle material. Thus it is possible to provide: a brush bristle material that has characteristics such as a soft texture that does not harm the object being cleaned, as well as an excellent cleaning performance even including the ability to scrape off dirt, and furthermore has an excellent durability; a brush using the brush bristle material;and a manufacturing method for the brush bristle material.

Description

technical field [0001] The present invention relates to a brush bristle material suitable for various brushes including toothbrushes, a brush using the same, and a method for producing the brush bristle material. Background technique [0002] Conventionally, the technique of using synthetic fiber monofilament as a brush bristle material is widely known. For brushes using such bristle materials for brushes, such as toothbrushes, it is desired that the cleaning effect of the teeth obtained by the bristles, the soft touch of the degree that does not hurt the object to be cleaned, and the massage effect of the gums are well-balanced and excellent. Further, it is desired It has excellent sweeping (掻き取り) performance of dirt when cleaning by the tip of the hair. [0003] However, when the bristle material for brushes is formed of monofilaments of a single material up to the tip of the bristles, it may be difficult to satisfy such requirements. That is, in the case where the tip o...

AI Technical Summary

Problems solved by technology

That is, the remaining problem is that the islands are distributed over substantially the entire area of ​​the cross-section of the sea-island composite fiber used as the bristle material for brushes, and the islands are exposed at the front end of the bristle material. In the case of etc., when an external force is applied to the exposed island by friction or the like, depending on the magnitude of the external force, the sea part supporting the exposed island at the base of the wool material may crack, and the durability may become insufficient.

Images