Abstract: A process for producing an adhesive tape with a stripe-shaped application of the adhesive on a backing material, where the backing web is guided past a dip roll which is in contact with the backing web, the roll rotates in a bath of adhesive, thereby transferring the adhesive to the roll surface, the roll is designed such that after the roll has run through the bath at least one stripe on the roll surface is adhesive-free.

Abstract: A method for removing organic contaminants including yeast cells from a particulate filter aid such as kieselguhr includes steps of producing an aqueous suspension of the contaminated filter aid, and adding to the suspension a mixture of enzymes (protease, amylase and glucanase) capable of dissolving yeast cell walls. Optionally, an oxidizer may also be added, and the suspension may be agitated ultrasonically. After sufficient time, the enzyme and dissolved organic contaminant are removed from the suspension by rinsing with dilute caustic soda, and the decontaminated filter aid is acid neutralized. Finally, the filter aid may be separated into coarse and fine fractions, and re-used.