Patent ID: 8640923

Claim:
A device for dosing dyes in solution or dispersion for the preparation of dye baths for textile materials, the device comprising: a plurality of pipettes individually connected to corresponding bottles or containers containing dyes, said bottles or containers being respectively connected to a dosing head through corresponding third conduits from which the dyes exit; a plurality of electrovalves, each of said plurality of electrovalves being connected with a corresponding pipette by a first conduit, with a corresponding bottle by a second conduit and with the dosing head through one of said third conduits, in which a dosage involves a delivery of preset quantities of dyes individually through the third conduits connected with the dosing head; a programmable means for individually controlling said pipettes and said electrovalves and for operating an automatic subdivision or selection of the electrovalves in two groups, wherein, according to a programmed formulation: a first group of electrovalves initially connect respective bottles with corresponding pipettes through the first conduits and the second conduits, as the electrovalves of a second group, and in a subsequent dosing step connect the respective pipettes with the dosing head through the first conduits and the third conduits and then restore individual links once the dosing is completed; and the electrovalves of the second group constantly maintain a connection between the respective pipettes and the corresponding bottles such that respective not dosed dyes are recirculated to each bottle through the respective first conduits and second conduits.