But by far the most important process material is water. For each kilo of paper approximately 100 litres of water are required. In our time, the only justification – economically as well as ecologically – for the use of such enormous quantities of water, is closed circulation and effective waste water treatment.
The Sappi paper mills have the highest expenditures for en- vironmental protection, even when compared to the high national standards.
In the proportioning system water, stuffs and fillers are brought together in mix tubs. The so-called constant part of a paper machine constitutes the transition from pulp preparation to the headbox of the paper machine. Another element of this constant part is the sorting unit, where impurities, foreign substances and patches are removed.
But by far the most important process material is water. For each kilo of paper approximately 100 litres of water are required. In our time, the only justification – economically as well as ecologically – for the use of such enormous quantities of water, is closed circulation and effective waste water treatment.The Sappi paper mills have the highest expenditures for en- vironmental protection, even when compared to the high national standards.In the proportioning system water, stuffs and fillers are brought together in mix tubs. The so-called constant part of a paper machine constitutes the transition from pulp preparation to the headbox of the paper machine. Another element of this constant part is the sorting unit, where impurities, foreign substances and patches are removed.
การแปล กรุณารอสักครู่..