| 摘要 |
<p>Apparatus for grinding pigment and for introducing predetermined amounts of pigment to plastic material being fed to an injection molding machine. The pigment is ground from bars by a helical grinder energized by variable speed means which controls the ratio of pigment to plastic in the feed to the injection screw. Positive displacement pigment feeding means is included having automatic disengagement means associated with the feeding means for disengaging the latter when the pigment material has become substantially exhausted. The feeding means is chain driven and is adjustable relative to the chain to ensure there is no slack between the feeding means and the pigment bars.</p> |
