Abstract The present invention relates to a method for the production of dispersions of dyestuffs, in which the initial ingredients are fed individually and at different locations and stages into a continuously operating mixing and kneading machine and are processed therein. The dyestuff pigments are first mixed and degassed with slight heating whereafter they are conveyed in sliding motion into the apertures of the mixing and kneading machine and in such a manner that the material falls into the machine adjacent the periphery of the cross-section of the filling aperture leaving in the center, a free space for the exhaustion of gas. In addition, the invention relates to an apparatus for carrying out this method comprising a continuously operable mixing and kneading machine, having a rotatable and simultaneously oscillatable shaft with worm blades, said machine being provided with spatially separated filling apertures, a heatable conveyor worm and a drop chute for feeding dyestuff pigments, the said drop chute having conical enlargements at its upper and lower end and a downwardly open slide cone having a central upwardly directed exhaust pipe, which is provided in the end region of the lower conical enlargement.
An apparatus for continuously mixing and kneading dispersions of solid finely divided pigment, solid finely divided polymer binder and liquid dispersing agent, comprising: a. a hollow cylindrical casing with a rotatable and reciprocating shaft along the axis thereof, said shaft being fitted with worm blades for continuous mixing and kneading action; b. a first feeding means into said casing for feeding said polymer binder which includes conveying means within a hopper and a hollow shaft connecting the bottom of the hopper to an inlet opening in said hollow cylindrical casing, said conveying means providing continuous flow of polymer binder into said worm blades and said shaft providing a channel for de-aeration of said binder during mixing; c. a second feeding means into said casing at a location downstream of said first feeding means for feeding said liquid dispersing agent into the casing to be mixed with said binder by said rotating worm blades; d. a third feeding means into said casing at a location downstream of said second feeding means for conveying said pigment, including a slowly rotating worm conveyer, heating means for said worm conveyer, pigment feeding means at the inlet of said conveyer, a biconical hopper in communication with the outlet of said conveyer, and a drop chute fitted with a cover, the pigment discharging from said heated worm conveyer and flowing by gravity about the inner periphery of said drop chute and about the inner periphery of said biconical hopper with free space in the center of the hopper to permit exhaust gases to escape in the vertical direction opposite to the direcTion of the gravity flow of said pigment; e. a ventilating pipe which is coaxial with and within said drop chute in communication with the free space in said biconical hopper, said pipe projecting at its upper end through and above said cover of said drop chute to exhaust gases which are given off by the heated pigment, the slope of the biconical hopper being selected to permit free flow of heated pigment into the casing without plugging the opening between the bottom of the biconical hopper and the casing; and, f. degassing means adjacent the outlet of said conical hopper into said casing and downstream therefrom.
Claim 2
Dependent Claim
24 words
An apparatus as claimed in claim 2, wherein said conveying means constitutes blades attached to said hollow shaft and said hollow shaft is rotatable.
Claim 3
Dependent Claim
53 words
An apparatus as claimed in claim 3, wherein said blades are spaced wider apart near the top of said hollow shaft than near the bottom, whereby the blades near the top serve to loosen the binder and the blades near the bottom assure smooth and uniform conveying of the binder into the casing.