Manufacturing method of needle-shaped bristles having short taper length and a toothbrush by same manufacturing method
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United States of America Patent
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Sep 3, 2013
Grant Date -
May 13, 2010
app pub date -
Nov 29, 2006
filing date -
Nov 16, 2006
priority date (Note) -
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Abstract
The present invention relates to a method of manufacturing a needle-shaped bristle having a short taper length. The method includes preparing a bundle of toothbrush bristles by mixing a polyester resin (a polyester resin other than a PTT resin) and a PTT resin in a ratio of 90˜40 to 10˜60 and spinning the mixture thereof; cutting the bundle of toothbrush bristles; and tapering the cut bundle of toothbrush bristles by immersing it into a chemical. According to the present invention, since needle-shaped bristles having a taper length of 6 mm or less can be efficiently obtained, the needle-shaped bristles can be implanted even in an anchorless toothbrush.
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