A solid colorant dispensing unit for dispensing charges of solid spherical colorant particles in a time-controlled way, the dispensing unit having a supply container having a nozzle for dispensing the particles having a number average particle size and a number particle size distribution, wherein a ratio of the standard deviation of the number particle size distribution to the number average particle size of the particles is less than 25%. The nozzle having a dispensing outlet having a diameter taking into account the number average particle size of the particles. The dispensing unit having a control assembly for controlling the dispensing of the charges of the particles by taking into account the properties of the particles and the diameter of the outlet of the nozzle. A tinting machine having the solid colorant dispensing unit.
A solid colorant dispensing unit for dispensing charges of solid spherical colorant particles in a time-controlled way, the dispensing unit having a supply container having a nozzle for dispensing the particles having a number average particle size and a number particle size distribution, wherein a ratio of the standard deviation of the number particle size distribution to the number average particle size of the particles is less than 25%. The nozzle having a dispensing outlet having a diameter taking into account the number average particle size of the particles. The dispensing unit having a control assembly for controlling the dispensing of the charges of the particles by taking into account the properties of the particles and the diameter of the outlet of the nozzle. A tinting machine having the solid colorant dispensing unit.
The invention relates to asolid colorant dispensing unit (1) for dispensing charges of solid spherical colorant particles (2) in a time-controlled way, said dispensing unit comprising a supply container (3) having a nozzle (5) for dispensing said particles having a number average particle size and a number particle size distribution, wherein a ratio of the standard deviation of the number particle size distribution to the number average particle size of said particles is less than 25%. The nozzle comprising a dispensing outlet (6) having a diameter (7) taking into account the number average particle size of said particles. Said dispensing unit comprising a control assembly (8) for controlling the dispensing of said charges of said particles by taking into account said properties of said particles and the diameter of the outlet of the nozzle. The invention also relates to a tinting machine (29) comprising said solid colorant dispensing unit.
A solid colorant including a. 30-97 wt % of a pigment, b. less than 5 wt % of a solvent c. 3-40 wt % surfactants and wherein: the ratio S/A [Std dev of the particle size distribution/average particle size] of the solid colorant is <25%, preferably <22% and more preferably <20%, wherein wt % is relative to the total weight of the solid colorant, and wherein the particle size distribution is determined with light scattering with fully automated image analysis according to ISO 13322-1 Static image analysis First edition 2004 Dec. 1 by the use of the OCCHIO ZEPHYR ESR analyzer. A process for making the solid colorant, and the use of the solid colorant for tinting base paints by volumetric dosing of the solid colorant to the base paint.
C09D 17/00 - Pigment pastes, e.g. for mixing in paints
F26B 5/06 - Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum the process involving freezing
C09B 67/42 - Preparations of dyes not provided for in a single one of groups
The invention relates to a solid colorant comprising a. 30-97 wt% of a pigment b. less than 5 wt% of a solvent c. 3-40 wt% surfactants and wherein: The ratio S/A [Std dev of the particle size distribution / average particle size] of the solid colorant is <25%, preferably <22% and more preferably <20%, wherein wt% is relative to the total weight of the solid colorant, and wherein the particle size distribution is determined with light scattering with fully automated image analysis according to ISO 13322-1 Static image analysis First edition 2004-12-01 by the use of the OCCHIO ZEPHYR ESR analyzer. The invention also relates to a process for making the solid colorant, and the use of the solid colorant for tinting base paints by volumetric dosing of the solid colorant to the base paint.
C09B 67/00 - Influencing the physical, e.g. the dyeing or printing, properties of dyestuffs without chemical reaction, e.g. by treating with solventsProcess features in the making of dyestuff preparationsDyestuff preparations of a special physical nature, e.g. tablets, films
F26B 5/06 - Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum the process involving freezing
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