The Paper Mill Chemist

Cover The Paper Mill Chemist
The Paper Mill Chemist
H P Henry Potter Stevens
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air-dry pulp in 24 hours. In America, instead of sieves plates with slits similar to strainer plates are used ; width of slit, '28- "38 mm. The power required to produce mechani- cal pulp, by machines working on the principle of cold and hot grinding respectively, have recently been worked out by Eirschner. They are as follows (a contrast is made between plants taking 150 h.p.) : — TABLE XXXVL comparativb trials on production op pulp by cold and hot Grindinq (Kirsohner).
Grinding requiring 150
...h.p.
Gold, Heavier gearing 30 % 45 h.p.
1 refiner working twenty-four hours . . . 15 „ 2 sorting machines 5 „ 1 board machine 3 ,, Raising water for grinder 2 „ 70 H.P.
There remains for grinding with two five-press machines . 80 „ 150 H.p.
Output in twenty-four hours 2000 kg. 100 kg. pulp in twenty-four hours require 7^ h.p. 1 h .p. produces 556 grams.
1 Beadle ("Theory and Practice of Beating," Paper Maker, 1st June, 1905) arrived independently at similar figures, viz.^ 735 grams air-dry pulp per h.p.h., or 1 cwt requires 70 h p.h.


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