The point of choosing a textile printing paste
When selecting the desired printing paste, it is necessary to check the various physical and chemical properties of the paste in order to obtain the best printing effect while obtaining the best economic benefits. The following are the relevant properties that should be tested.
Viscosity: The paste has different viscosities. If the fabric to be printed is hydrophilic and has good water absorption, a low-viscosity paste is used, which gives a fine and clear printing effect and considerable economic benefits. If the fabric is hydrophobic or a high-twist fabric, it is most appropriate to use a high-solids or low-viscosity paste.
Viscosity Index: The viscosity index is used to determine the shear sensitivity of printing pastes. Each natural polymer has a shear sensitivity that is a natural pseudoplasticity.
PVI: PVI is defined as the ratio between viscosity I and viscosity II, and PVI is inversely proportional to the viscosity index. The higher PVI, which is close to 1, has a lower shear sensitivity and a higher viscosity index, indicating that the product is more sensitive to shear forces.
Ion properties: The modified pastes have different ionic properties, such as anionic or nonionic. One should select suitable pastes with the same ionic properties depending on the ionic properties of the dyes or auxiliaries used. Otherwise the paste will work with dyes or auxiliaries, resulting in mutual cross-linking, or loss of penetrability on the printed fabric. Therefore, special attention should be paid to the compatibility between the pastes and auxiliaries used in the pastes and their printing pastes. Sex.
The quality of paste paste film: The paste film formed after drying has high elasticity, and has the best moisture absorption, so that the paste film will not peel off or crack when it is steamed or hot-fixed at high temperature. It can absorb enough water to make the dye and auxiliary molecules have corresponding fluidity, so that the dye can be absorbed by the fiber as much as possible.
When selecting the desired printing paste, it is necessary to check the various physical and chemical properties of the paste in order to obtain the best printing effect while obtaining the best economic benefits. The following are the relevant properties that should be tested.
Viscosity: The paste has different viscosities. If the fabric to be printed is hydrophilic and has good water absorption, a low-viscosity paste is used, which gives a fine and clear printing effect and considerable economic benefits. If the fabric is hydrophobic or a high-twist fabric, it is most appropriate to use a high-solids or low-viscosity paste.
Viscosity Index: The viscosity index is used to determine the shear sensitivity of printing pastes. Each natural polymer has a shear sensitivity that is a natural pseudoplasticity.
PVI: PVI is defined as the ratio between viscosity I and viscosity II, and PVI is inversely proportional to the viscosity index. The higher PVI, which is close to 1, has a lower shear sensitivity and a higher viscosity index, indicating that the product is more sensitive to shear forces.
Ion properties: The modified pastes have different ionic properties, such as anionic or nonionic. One should select suitable pastes with the same ionic properties depending on the ionic properties of the dyes or auxiliaries used. Otherwise the paste will work with dyes or auxiliaries, resulting in mutual cross-linking, or loss of penetrability on the printed fabric. Therefore, special attention should be paid to the compatibility between the pastes and auxiliaries used in the pastes and their printing pastes. Sex.
The quality of paste paste film: The paste film formed after drying has high elasticity, and has the best moisture absorption, so that the paste film will not peel off or crack when it is steamed or hot-fixed at high temperature. It can absorb enough water to make the dye and auxiliary molecules have corresponding fluidity, so that the dye can be absorbed by the fiber as much as possible.
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