THE EFFECT OF PAPER-MACHINE FORMING AND PRESSING ON OFFSET LINTING - FORMING AND CONSOLIDATION IN THE PRESSES STRONGLY INFLUENCE SHEET LINTING

Commercial and pilot paper machine trials confirmed that both forming and pressing have a strong influence on the linting of 100% mechanical pulp sheets. Conversion of a pilot machine from Fourdrinier to topfor mer drastically reduced the material of all sizes removed from both su rfaces. A poorly formed, high linting, sheet surface can be improved m ore by pressing, or improved pulp quality, than a well formed, low lin ting surface. Increased pressing reduces removal of the small material on both sides of the sheet but reduces the larger, intermediate and p ick material primarily on the side contacted by the felt. On the comme rcial machine, variations in pulp quality affected the linting.