Cortec develops recyclable moisture barrier coating for food packaging

Cortec develops recyclable moisture barrier coating for food packaging

Retail and consumer food packaging often relies on polyethylene or “wax” coated paper and cardboard to resist moisture and seal out contaminants. The problem, according to Cortec Corporation, is that these packaging materials are much more difficult to re-pulp than regular uncoated paper and corrugated board and typically cannot be recycled through normal channels.

To replace these environmentally problematic materials, Cortec has developed EcoShield Barrier Coating, an environmentally friendly alternative to polyethylene and wax paper coatings for the manufacture of moisture resistant paper and corrugated boxes.

EcoShield Barrier Coating is a water-borne barrier coating that is recyclable and 100% repulpable, eliminating the need to use traditional wax and polyethylene coatings. The coating can be used on kraft and recycled paper, as well as on liners for corrugated boxes, providing a waterproof moisture barrier with reportedly excellent oil and grease resistance. When tested according to ASTM E-96, paper coated with EcoShield Barrier Coating showed very good water vapour barrier properties compared to a polyethylene coated paper and better than commercial waxed paper.

According to Cortec, papers coated with EcoShield Barrier Coating also have better physical properties such as burst, tear, and tensile strength; elongation, folding endurance, coefficient of friction, and smoothness.

EcoShield Barrier Coating is formulated in compliance with FDA Code of Federal Regulations Title 21:

  • §176.170-Components of paper and paperboard in contact with aqueous and fatty foods
  • §176.180-Components of paper and paperboard in contact with dry food

The coating can be applied by most common paper roll coaters, including gravure, flex, air-knife, reverse-roll, etc. Drying temperature is 180-200 °F (82-93 °C), and suggested paper weights are 8-11 lb/ream (3,000 ft²) (13-18 g/m²).

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