Ciba-geigy Corporation

Roland Bauhofer

Mickael Mheidle

Hans Scheidegger

Hermann Flensberg

An apparatus (1) for metering dry and pulverulent pourable material, for example dye powder in a laboratory dyeing line for textiles, the apparatus (1) having a discharge container (8) which has a closable outlet (9) in its lower region, scales (10) for metering the amount of material that is to be conveyed from the outlet (9) of the container (8), with outlet (9) being arranged on the underside of the container (8) and having as closure a valve body (12) that tapers towards the top and can be displaced vertically downwards, the valve body (12) being drivable in rotation and rotating while it is in its open position and having the capability for conveying the material in the direction towards the outlet opening (14), therefore performing a dual function.

Apparatus for metering dry and/or pulverulent pourable material,

Described is a process for the dyeing of textile material by the exhaust method, whereby the dyeing is commenced at a pH value of between 6 and 12 and terminated at a pH value of between 3 and 7, which process is characterized in that during dyeing the pH value is lowered, by the addition of an inorganic acid, by at least 1 unit of pH value; and that subsequent to the dyeing the exhausted bath, after the addition of alkali, dye and, if required, further auxiliaries, is optionally used afresh for dyeing. Furthermore an apparatus for carrying out this process is described which consists of a dyeing aggregate having a liquor-circulating system which contains at least one pH-measuring point as well as at least one dosing device.

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Bockten, Switzerland

Roland Bauhofer