10 10 8 5 25 12 18__________________________________________________________________________ glycerin ester of a wood rosin having an acid number of 8 a cardboard was fabricated of 100 recycled paper 50 newsprint and 50 department store waste on a kammerer experimental paper machine to a gsm substance value of 200 the stock consistency was 1 2 weight the dilution of the dispersion before applying it to the stock goes up to 0 48 the dilution was done with backwater in the machine tub 0 35 with reference to the dry substance of the recycled paper of a cationic starch hi cat 100 u00ae made by roquette were added to the suspension the sizing agents were continuously added to the substance stream in measured quantities the ph of the system was measured at the headbox the temperature of the substance at the headbox was about 35 u00b0 c test samples taken from the dried paper panel had a residual moisture content of 4 to 5 and were examined after 24 hours of exposure to 23 u00b0 c and 55 relative humidity as to their degree of sizing type and quantity of the added auxiliary substances and the resulting sizing values are compiled in table 5 table 5__________________________________________________________________________ comparison commercial product sizing agent example 10 example 8 example 1 as in example__________________________________________________________________________ 18starting weight 0 5 0 5 0 75 0 75 0 5 0 5 0 75 0 75 0 5 0 5 0 75 0 75 0 5 0 5 0 75 0 75 atro sup retention agent 0 02 0 02 0 02 0 02 0 02 0 02 0 02 0 02 0 02 0 02 0 02 0 02 0 5 0 5 0 75 0 75aluminum sulfate 0 03 0 3 0 3 0 3 0 3 0 3.