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In all textile printing, the nature and, particularly, the viscosity of the print paste are important, and the thickeners employed must be compatible with all the other components.
For discharge printing, the cloth is first dyed with a background colour, which is destroyed by reagents, or reducing agents, carried in a print paste.
Print paste is poured on to the screen edge nearest the operator and is spread with a squeegee over the surface of the screen so that colour is pushed through the open parts.
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This action may leave the discharged design white on a coloured background, although print pastes may also contain colouring matters not destroyed by the discharging agent, producing a coloured design.
Each printing roller is provided with a rotating colour-furnishing roller, partially immersed in a trough of printing paste.
Screen printing was used for surface-finishing of cotton using a printing paste containing silver nitrate.
The conductive printing paste contains micro-sized Ag powders and nano-sized TiO2 cementing agent.
The color, its strength and stability of samples, depend on absorbed UVC energy and the formula of the printing paste.
The as-printed films were sintered at 400°C for 1 h before dye sensitization to remove organic materials in the screen-printing paste.
The conductive printing paste can be well cemented on the FTO glass and form high conductive grids with Ag powders sintered together by the nano-sized TiO2 particles.
A new chemical technique for preparing screen-printing paste from commercially-available P-25 powder was proposed to fabricate TiO2 electrodes for dye-sensitized solar cells (DSSCs).
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