Cel-Met and O2 Barrier metallized sealants from Celplast permit down-gauging of approximately 25% without compromising the barrier properties or performance of the barrier laminate. The Cel-Met sealant replaces metallized oriented polypropylene to reduce a three-ply structure to two plies while providing an oxygen transmission rate (OTR) of 4.0 cubic centimeters per 100 square inches per day and a water vapor transmission rate (WVTR) of 0.08 grams per 100 square inches per day. The O2 Barrier sealant replaces metallized polyethylene terephthalate to convert a three-ply structure to a two-ply and provides even higher barrier properties: 0.04 cubic centimeters per 100 square inches per day OTR and 0.05 grams per 100 square inches per day WVTR. Eliminating the need for a second pass in the lamination process also conserves adhesive and reduces energy requirements 31% for solvent-based structures and 11% for solvent-less. Carbon dioxide emissions also drop: 34% for solvent-based laminating and 30% for solvent-less. Applications include stand-up and peg-display pouches.
The judges noted the metallized sealants reduce steps in the process and achieve a significant source reduction. “It’s a new way of looking at structures and definitely a step in the right direction,” concluded one member of the panel.
A detailed article on these Barrier Sealants is available on Converting Quarterly Magazine 2011 Quarter 2 p 56.