Pigment pre-blending mixhead attachment
AssigneeE. I. Du Pont de Nemours and Company
InventorCharles H. Beckmann
Life of this patent
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Abstract
An attachment to a dynamic mixhead allows pigment to be fully blended with a specified volumetric portion of a reactive polymer mix immediately prior to its passing through an in-line motionless mixer. The fully pigmented portion of the mix passes into the motionless mixer concurrently with the nonpigmented remainder of the polymer mix, each portion constituting a discrete stream and positioned in a manner facilitating rapid, improved blending. The pigment pre-blending attachment possesses particular utility for partial or incomplete blending applications, wherein striations of color are desired to impart a marbled effect.
Claims3
A mixhead attachment for preparing a viscous fluid for marbled pigmentation, said attachment being adapted to convey said fluid from a mixhead to an in-line motionless mixer, said attachment comprising:
- a generally cylindrical housing having an inlet end adapted for attachment to said mixhead and an outlet end adapted for attachment to said motionless mixer;
- an open-ended, generally cylindrical tube coaxially positioned within said housing and radially separated therefrom, providing a first annular passage for the flow of a portion of said fluid;
- means for securing said tube within said housing;
- a mixing shaft rotatably mounted within said tube and radially separated therefrom, providing a second annular passage for the flow of the balance of said fluid;
- a plurality of fins mounted on said mixing shaft and partially extending into the second annular passage;
- means for rotating said mixing shaft;
- and
- means for allowing the introduction of pigment into said second annular passage wherein substantially complete pigmentation of said balance of said fluid occurs.
Dependencies are inferred from the claim text.