The Papermakers Pocket book Specially Comp for Paper Mill Operatives Enginee
The Papermakers Pocket book Specially Comp for Paper Mill Operatives Enginee
James Beveridge
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The flux is allowed to cool, dissolved in H Cl, the fluid neutralized with ammonia, and then filtered. Add to the filtrate ammonium oxalate. If lime be present in any quantity a white precipitate will be formed. FINENESS. To ascertain whether sand, undecomposed rock, and other coarse bodies are present, 20 grammes of the clay are rubbed up with water in a mortar, and then sieved through wire gauze, 100 meshes to the inch. The residue remaining on the sieve may be weighed. PLASTICITY. The measur...e of the plasticity of a clay for papermaking is best carried out in the following way : Make up a thin starch paste by boiling 1 gramme of 'starch in a litre of water. Place 100 c. Cs. Of this paste together with 5 grammes of the sample of day in a graduated glass, and shake well. Allow to stand at rest for 24 hours. The finer and more plastic the clay, the greater its miscibilifcy with the starch paste i. E. , the less it settles to the bottom of the vessel. Various samples may be compared in this way.
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