Selecting Thickening Agents
The printing thickeners used depend on the printing technique and fabric and dyestuff used. Typical thickening agents are starch derivatives, flour, gum arabic, guar gum derivatives, tamarind, sodium alginate, sodium polyacrylate, gum Senegal and gum tragacanth, British gum or dextrine and albumen.
Hot water soluble tickening agents as native starch are made into pastes by boiling in double or jacketed pans, between the inner and outer casings of which either steam or water may be made to circulate, for boiling and cooling purposes. Mechanical agitators are also fitted in these pans to mix the various ingredients together, and to destroy lumps and prevent the formation of lumps, keeping the contents thoroughly stirred up during the whole time they are being boiled and cooled to make a smooth paste. Most thickening agents used today are cold soluble and require only extensive stirring.
Read more about this topic: Textile Printing
Famous quotes containing the words selecting and/or agents:
“If marriages were made by putting all the men’s names into one sack and the women’s names into another, and having them taken out by a blindfolded child like lottery numbers, there would be just as high a percentage of happy marriages as we have here in England.... If you can tell me of any trustworthy method of selecting a wife, I shall be happy to make use of it.”
—George Bernard Shaw (1856–1950)
“The Times are the masquerade of the eternities; trivial to the dull, tokens of noble and majestic agents to the wise; the receptacle in which the Past leaves its history; the quarry out of which the genius of today is building up the Future.”
—Ralph Waldo Emerson (1803–1882)