Method of molding toothbrushes and apparatus for performing the method
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United States of America Patent
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Sep 17, 2002
Grant Date -
N/A
app pub date -
Apr 28, 2000
filing date -
Oct 30, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the proposed method of molding toothbrushes, a mold with relatively movable mold parts (14, 16) defining at least one molding cavity (20) corresponding in shape to a toothbrush body is used. One of the mold parts (16) has a brush head defining cavity portion with a plurality of holes (24) for partial penetration into the cavity portion of a like number of fiber tufts. Plasticized molding material is injected under pressure into the cavity (20). Pressure within the cavity is sensed during the injecting step. The injection is stopped when the pressure within the cavity exceeds a predetermined pressure value, thereby avoiding any leakage of molding material through the holes (24).
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