Stamp ink and stamp ink impregnation pad for stencil printing
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsHiroshi Taira, Minoru Yamamoto, Hiroshi Takami, Takahiro Yuasa, Hideki Hasegawa
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Abstract
A stamp ink, for stencil printing, is made from a coloring-agent mixed in a vehicle made from resin and oil-based solvent. The stamp ink has a viscosity in a range from 20 to 250 poises at a shear rate of 20/sec under temperature of 25.degree. C. and has a thixotropy index T.I. in a range from 1.2 to 3.0 under temperature of 25.degree. C. where the thixotropy index T.I. is defined in the expression of: T.I.=(Viscosity at a shear rate of 0.5/sec)/(Viscosity at a shear rate of 5.O/sec).
Claims15
A stamp ink for stencil printing, comprising a coloring-agent mixed in a vehicle made from resin and oil-based solvent, wherein the stamp ink has a viscosity in the range of from 20 to 250 posies at a shear rate of 20/sec at a temperature of 25.degree. C., and has a thixotropy index T.I. in the range of from 1.2 to 3.0 at a temperature of 25.degree. C., wherein the thixotropy index T.I. is defined in the expression of:
- T.I.=(Viscosity at a shear rate of 0.5/sec)/(Viscosity at a shear rate of 5.0/sec).
Dependencies are inferred from the claim text.