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The Flow Properties of Textile Printing Pastes
Author(s) -
Debby R. L.,
Higginbotham R. S.
Publication year - 1953
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1953.tb02799.x
Subject(s) - shearing (physics) , viscosity , materials science , composite material , shear rate , shear stress , screen printing , textile
The coslour pastes employed in the machine printing of textiles are rheologically complex fluids, the viscosity coefficient falling with increase in rate of shear or shearing stress. In order to relate the viscosity of a paste with the quality of the resulting print, it is essential that the measurements of apparent viscosity should be made at the operative shearing stresses. Sharpness of definition is shown to be controlled by the viscosity of the printing paste at a shearing stress of 4500 dynes/sq.cm., and levelness by the viscosity at low stresses of the order of 100 dynes/sq.cm. Viscosity ranges suitable for the printing of fine lines, pegs, and blotches are indicated. The amount of anomaly which can be tolerated in pastes intended for the printing of fine lines is greater than in those intended for the printing of pegs and blotches, where the conflicting requirements of levelness and definition have to be satisfied.