Method of making glass fibers having a reduced tendency to give gumming deposits

In a method of forming a sized glass fiber strand comprising drawing glass streams through orifices in a bushing to form individual glass fibers, moving the fibers away from the bushing at a high rate of speed and forming them into a strand, and applying to the fibers while they are moving at this speed and before they are formed into a strand a starch-based sizing solution;

• 4 percent to 52 percent by weight of the salt of a polyamino functional polyamide resin, said polyamino functional polyamide resin salt being formed from the condensation reaction product of a carboxylic acid and a polyamine, said polyamine having greater than 2 amine groups per molecule, and a carboxylic acid having 1 to 5 carbon atoms;
• 5 to 25 percent by weight of a wax from the group consisting of animal waxes, vegetable waxes, mineral waxes and synthetic waxes;
• and 9 percent to 77 percent by weight of a fatty triglyceride;
• and collecting the glass strands so produced;
• the improvement comprising:
• using in the size solution about 50 to about 65 weight percent based on the non-aqueous components in the solution of a starch containing cross-links that has been partially cooked to within about 50 percent of complete cooking so that the sized glass strands produced have a reduced tendency to form gummy deposits under high relative humidity conditions.