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NATIONAL ADHESIVES: Flier On Extrusion Seam Gumming
A new flier from National Adhesives helps envelope manufacturers ensure consistent productivity in extrusion seam gumming operations. It addresses seam gum formulation, nozzle size, setup, pressure, specific aspects of preventive maintenance and back-flap gumming. Extrusion seam gum formulations must produce minimal buildup and proper cut-off, even at high speeds, to optimize production. The flier explains that the nozzle must be an appropriate size to ensure that an appropriate amount of gum is applied with clean cut-off and minimal tailing. Critical setup features include an appropriate distance between the nozzle tip and the paper, and proper paper control during adhesive application.