. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. ove a certain proportion of the water from the pulpsupplied to it, thus increasing the consistency and thickening thepulp. Stock is admitted through inlet pipe 7 and is distributed alongthe full width of the vat 8 by the baffle 11. The stock level inthe vat is maintained from 3 in. to 6 in. below the top of thecylinder, or even lower if the cylinder is rotating fast. The waterilows into the cylinder through the wire mesh that covers it,and then flows out at the end of the cylinder through outlet wat
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. ove a certain proportion of the water from the pulpsupplied to it, thus increasing the consistency and thickening thepulp. Stock is admitted through inlet pipe 7 and is distributed alongthe full width of the vat 8 by the baffle 11. The stock level inthe vat is maintained from 3 in. to 6 in. below the top of thecylinder, or even lower if the cylinder is rotating fast. The waterilows into the cylinder through the wire mesh that covers it,and then flows out at the end of the cylinder through outlet water, called white water, may be discharged at both endsof the cylinder, when proper arrangements are made in thecylinder, and this is the usual practice where large amounts ofwater are handled, especially in thickening chemical pulps. The space between each end of the cylinder and the vat endsi< sealed by a felt collar, thereby keeping the stock from leaking 1 Called slow because water ilrains from it free because water drains from it freely. 48 TREATMENT OF PULP §7. §7 TREATMENT OF PULP AFTER SCREENING 49 into the white-water outlet. There are various types of collarsused, but all serve the same purpose; their adjustments should befrequently checked, as it is very important that no leaks occur atthis point. The level of the water inside the cylinder is generallykept as low as possible; if a free discharge is provided, this waterlevel will be automatically regulated. The difference of levelbetween the stock in the vat and the white water in the cylindergreatly influences the amount of stock caught on the surfaceof the cylinder. If there were no difference of level, no stockwould be deposited on the cylinder, and the greater the differencein level the greater the head inducing the flow of water and thegreater will be the amount of stock deposited on the amount of stock deposited on the cylinder is also greateras the vat level is increased, , a
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