Abstract: The present invention relates to a device for extracting and proportioning pulverulent products comprising a hopper and coaxial screws with threads of opposite directions, driven in rotation in a cylindrical conduit, which screws are separated from each other by the wall of a tube coaxial to the screws and to the conduit, the screw of smaller diameter rotating inside the tube to convey the product therein in one direction and the screw of larger diameter rotating outside said tube to convey the product in the opposite direction, in the space defined between the tube and the conduit, said latter comprising on its periphery at least one orifice for the flow of the product, wherein said screws are composed of wires helically wound in the manner of a spring, and the tube in which the so-called extraction screw, of smaller diameter, is mounted, comprises on its periphery and on the hopper side an opening for the inlet of the product, in front of which said screws extend at least partially, which product, after hav

Abstract: The object of the invention is a micro-proportioner apparatus for divided or powdery products, especially colored pigments, which includes:A vertical hopper containing the divided products, equipped with a side-channel for outlet,A cylindrical rod which is moved periodically inside the said channel,And rotating paddles located preferably in two horizontal planes above and below the sliding rod.