Pigment volume can be divided into:
(1) The volume filled by the pigment when the pigment is freely sprinkled (removed by hand),
(2) Pigment volume after cutting,
(3) The volume of pigment that is stirred (shaked) into a liquid.
(1) Cloth withdrawal volume When the cloth is freely withdrawn, the volume filled by the unit weight of powdered pigment is called the cloth volume. But this concept is imprecise, because the spreading volume depends not only on the size and shape of the measuring device, but also on the amount of pigment powder used for the measurement. In addition, factors such as whether the pigment powder is pressed by the economy for some reason (transportation, warehouse storage, humidity, etc.) before the test also have an impact on the volume of the assembly.
However, the spreading volume still has certain significance in practical application. For example, the withdrawal volume, like the withdrawal specific gravity (see below), can be used to calculate the storage area and determine the amount of pigment in the open phase, because the specific gravity of the pigment cannot determine the size of the storage space occupied by the pigment. (Related instrument: specific gravity cup)
(2) Pigment volume after shaking The volume that the pigment of theoretical unit weight is dispersed into after being fully shaken is called the volume of pigment after shaking. According to the volume of pigment after material movement, the result is more accurate than the volume of cloth withdrawn.
(3) The volume shaken into the liquid After the pigment is stirred into a certain liquid and light for a certain period of time, the volume occupied by the pigment per unit weight is called the volume of the pigment after entering the liquid.
A comparative profile of the pigment fineness (degree of dispersion) can be drawn from this test. :
Spreading specific gravity When a certain weight of pigment is freely withdrawn, the ratio of its weight to the occupied volume is called the withdrawn specific gravity. The spreading specific gravity is calculated according to kg/dm3. For example, the volume of 1 kg of pigment powder that is freely withdrawn is 0.85 decimeters, and the specific gravity of the withdrawn cloth is
