Toothbrush having needle-shaped bristle tapered at one end and manufacturing method thereof
OwnerYoung-Jun Kwon, Sung-Wook Kwoninventors
Life of this patent
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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.
Claims16
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.
A method of manufacturing a toothbrush having needle-shaped bristle tapered only on one end, comprising the steps of:
- inserting non-tapered portions of the bristles into through holes of a head insert;
- thermally fusing the non-tapered portions of the bristles protruding from the bottom of the head insert, thereby fixing the bristles to the head insert;
- and
- attaching the bottom of the head insert to the head of the toothbrush.
A method of manufacturing a toothbrush having needle-shaped bristle tapered only on one end, comprising the steps of:
- inserting non-tapered portions of the bristles into through holes of a head insert;
- thermally fusing the non-tapered portions of the bristles protruding from the bottom of the head insert, thereby fixing the bristles to the head insert;
- attaching the bottom of the head insert to an upper metal mold;
- combining the upper metal mold with a lower metal mold;
- and
- injecting resin into the lower metal mold through an inlet, thereby attaching the head insert to the head of the toothbrush.
A method of manufacturing a toothbrush having needle-shaped bristle tapered only on one end, comprising the steps of:
- inserting non-tapered portions of the bristles into through holes of a lower metal mold to protrude 2 to 5 mm from the lower metal mold;
- thermally fusing the protrusions;
- combining an upper metal mold with the lower metal mold;
- and
- injecting resin into the upper and lower metal molds, thereby fixing the bristles directly to the head of the toothbrush.
Dependencies are inferred from the claim text.