IMPROVING LAY FLAT PROPERTIES OF PRINTING PAPER

摘要

The specification discloses a method for improving the lay flat properties of paper which comprises applying to a cellulosic fibrous web an aqueous solution consisting essentially of a dialdehyde, preferably glyoxal, and from about 50 to about 150 parts by weight of a polyol, preferably glycerol, per 100 parts of the dialdehyde and then drying the web at a temperature sufficient to cure the glyoxal and polyol. The concentration of dialdehyde and polyol in the solution is sufficient to provide a combined total of from about 0.1 to about 10 weight percent dialdehyde and polyol in the web based on the oven-dry weight of the paper. The solution is preferably applied in a papermaking process at or after the wet press and prior to treating the web with chemicals having free hydroxyl groups which may react with the dialdehyde.