Process for manufacturing a semifinished product from ground...

Details Process for manufacturing a semifinished product from ground... Process for manufacturing a semifinished product from ground...

D - Textiles, Paper

21

C

9/16

D21C 3/00 (2006.01)

Patent

CA 1088260

ABSTRACT OF THE DISCLOSURE The present invention relates to processes for manufactu- rig a semifinished product from ground vegetable raw ma- terial. In accordance with the proposed process, ground stea- med raw material is treated with an oxidant at pH less than 6.5 for a period of time not exceeding 5 hours but sufficient to ensure adequate penetration of the cooking reagent into the bulk of the raw material, whereupon the raw material is subjected to digestion under temperature conditions such that the temperature is first raised to about 160°C. for from 0.2 to 3 hours depending on the rate of formation of peroxide compo- unds in the cooking liquor, after which said temperature is maintained to allow said peroxide compounds to get formed, where upon the temperature is reduced to about 80°C. for from 0.1 to 4 hours depending on the rate of decomposition into radicals of the peroxide compounds. The proposed process gives a quality high-strength semifinished product of whiteness 40 percent with a yield of about 60 percent.

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