3. Yield value. Yield value refers to the fluid, plus some external force from the elastic deformation to the stress of the flow deformation of the boundaries, the ink began to laminar flow must be imposed by the minimum stress. The yield value is too large, Cotton Flags For Sale the ink stiff and difficult to open, inking inconvenience, poor leveling; Custom Flags And Poles yield value is too small, thin line and dot reproduction. Screen ink layer is thick and not too small, so the yield value. Screen ink according to different requirements, the yield value can be 1000dyn/cm2 to 3000dyn/cm2, s fine line drawing, the yield value should take a high value.
4. Fluidity. Fluidity is the reciprocal of viscosity. : Viscosity, the flow is small; viscosity, fluidity.
The flow of ink can be seen as the degree of external force, a certain amount of ink within a certain time and a smooth surface of the natural flow. The fluidity of the ink can be measured thin thick ink. Cotton Flags For Sale Screen ink fluidity of general control 30 ~
Ink fluidity, im is easy to expand, so that the gap of a small fine lines and differentiate unclear as well as merger; flow is small, imprinted lines easy to break out of ink, s difficult.
5 plasticity. Plasticity refers to the external force deformation, Order Custom Flags fully or in part, to maintain the nature of its deformation.
The screen ink is concentrated tone between the fluid and semi-solid suspension colloid, Cotton Flags For Sale so it has both mobility, plasticity. Pigments and other solids content is high, the ink becomes thick, large plasticity; pigments and other solids content is low, ink on thin, plasticity is small. Screen inks requires a certain degree of plasticity in order to maintain the accuracy of the , or lines can easily expand.
6. Surface tension. The ink surface tension related to the transfer of ink performance and the stability of im in the surface. This relationship on glossy materials, especially plastic surface on the becomes more prominent. For example, when more of the surface tension of the ink is greater than the surface tension of the surface, im will shrink, even fish eye holes; surface and the surface tension of the ink is similar, while the network version of the surface tension is greater than the when the surface tension of the surface, the will appear the phenomenon of blocking network. These cases, Cotton Flags For Sale by the addition of surfactant, microcrystalline waxes, silicide to be adjusted, the surface tension of the ink is equal to or less than the two forces of the surface of the table to get a good .
7 fineness. Fineness that connect compound uniformity of the distribution of indicators of pigments and other solid materials, Custom Flags For Boats particles the size of its particles in the ink. Can be used fine meter blew the appropriate dilute ink from the deepest recesses of the fine meter level at immediate light tilt 15 is observed. To see the ink particles at least
The fineness of the screen ink is generally between 15 to 45 microns. Cotton Flags For Sale The fineness is too thick, flag makers the will produce a paste version, printed no pattern. Coarse fineness also be bold. Generally the most coarse particles should be less than a quarter of the mesh area of ~.