Paper Making

Because of the high-level of whiteness and brightness, hydrophobic features, and its other physical and chemical attributes, Talc plays the role of a filler in paper industry and brings the following privilege into this industry:
  • As a Filler: micronized talc is added for imparting smoothness and opacity to the paper and also for filling up the ultrafine interstitial pores between cellulose fibers of the pulp so as to prevent water from entering into them as well as increasing the density of the product. Talc serves to offset the higher cost of ultrafine china clay (kaolin) without affecting the benefits to any great extent.
  • Coating: Platy structure of the Talc’s crystals and brightness are the principal criteria. The plates offer large flat surface areas and facilitate high retention on the coated surface. The minute plates talc stick to the paper along its surface, giving it a smooth bright finish and good printability. The specifications are similar to those in case of filler grade talc.
  • Process control: Talc, having high oil absorption, absorbs the oily droplets that are smaller in size than the talc particles. So far as the bigger sized droplets are concerned, the smooth slippery plates of talc enables its particles to stick to the droplets effectively neutralizing the stickiness of the latter. Additionally, Talc, on account of its slippery surface, reduces the friction on paper-manufacturing machinery thus reducing wear.
  • Tank lining: Talc or soapstone is sawn in the form of bricks for lining alkali recovery tanks. In such tanks, the environment is alkaline, and the inertness of talc to alkalis combined with the smooth slippery surface of the bricks are the chief criteria. The talc should be in massive form so as to facilitate cutting bricks out of it.
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