초록 ▼

Process for blending an additive such as colour pigment etc. with a plastic material, wherein the plastic material for instance in the shape of granules, pellets, grains or powder is introduced into a first hopper equipped with a stirrer. The first hopper is placed in a direct connection with a feed

Process for blending an additive such as colour pigment etc. with a plastic material, wherein the plastic material for instance in the shape of granules, pellets, grains or powder is introduced into a first hopper equipped with a stirrer. The first hopper is placed in a direct connection with a feed screw of a plastic moulding machine. The additive in the shape of granules, pellets, small tablets or big grains is charged into a second hopper which is joined to the first hopper by a dosing part including a dosing plate, which executes reciprocating motions and is equipped with at least one hole, and a dosing pipe, a dosing hose or the like. The amount of additive fed to the first hopper is intended to be regulated by varying the number of reciprocating motions of the dosing plate per unit of time and/or by varying the plate thickness and/or by varying the hole size of the dosing plate and/or by varying the number of holes in the dosing plate.

대표청구항 ▼

An apparatus for molding a plastic comprising a screw enclosed in a first housing for feeding plastic material to a molding means, an opening in said first housing, a first hopper for storage of plastic material having its longitudinal axis substantially perpendicular to that of the first housing an

An apparatus for molding a plastic comprising a screw enclosed in a first housing for feeding plastic material to a molding means, an opening in said first housing, a first hopper for storage of plastic material having its longitudinal axis substantially perpendicular to that of the first housing and having a tubular portion communicating with the opening, a second hopper for storage of a material to be mixed in metered amounts with the plastic material, a second housing having its longitudinal axis substantially perpendicular to that of the first hopper, said second housing having an upper wall, a bottom wall and sidewalls enclosing a space, a first opening in the said upper wall and a second opening in the said lower wall spaced longitudinally from the first opening, said second hopper being disposed above said first opening and communicating therewith, a reciprocating plate having an opening therethrough disposed in the space enclosed by the second housing and slidably disposed against the upper and lower walls of the second housing, whereby the volume of the said metered amounts is determined by the number of openings in the plate, the cross-section of the openings in the plate, the number of reciprocating motions of the plate per unit of time, and the thickness of the plate, a conduit communicating from said second opening and with said tubular portion immediately above the opening in the first housing, a stirrer disposed in the tubular portion of the first housing adjacent to the point where said conduit communicates with the tubular portion, and means for sliding the plate back and forth to alternately align the opening therethrough with said openings in the upper and lower walls.