Mill blending apparatus
AssigneeICO, Inc.
InventorJonathan Martin Dixon Steele
Life of this patent
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Abstract
A method of coloring thermoplastic olefin resins and pulverizing resin pellets in a single step involving the steps of metering liquid coloring onto resin pellets and then passing the combination of liquid color and resin pellets into a mill blender. The liquid color is metered onto the plastic pellets at a rate of from less than 0.2% to less than 1.0% by weight of the plastic pellets. The mill blender receives the combination of plastic pellets and liquid color and pulverizes the mixture to produce a colored thermoplastic resin powder that is suitable for subsequent processing, such as roto-molding or slush-molding.
Claims10
A process for coloring thermoplastic olefin based resins comprising the steps of:
- adding a suitable amount of liquid coloring compound to the thermoplastic olefin based resin at a rate sufficient to color the thermoplastic olefin based resin;
- passing the mixture of liquid coloring compound and thermoplastic olefin based resin into a mill;
- and
- pulverizing the mixture of liquid coloring compound and thermoplastic olefin based resin inside of the mill for a time sufficient to fuse said liquid coloring compound onto each particle of the thermoplastic olefin based resin.
Dependencies are inferred from the claim text.