November 26, 2017 By P&PC Staff
Nov. 26, 2017 – Cortec Corporation says it has developed an environmentally acceptable replacement to unrecyclable polycoated and waxed papers.
Its new high gloss EcoShield Super Barrier Paper and Linerboard relies on a water-based moisture barrier coating for moisture resistance. According to the company, the technology makes the paper fully recyclable and repulpable without requiring costly processes to remove the coating from the paper. In addition to recyclability, Cortec’s EcoShield Super Barrier Paper and Linerboard demonstrated better water vapour barrier properties than polycoated paper and waxed paper during testing, noted Cortec.
To evaluate the moisture resistance of EcoShield Super Barrier and Linerboard, the barrier paper was tested against a comparable polyethylene coated paper and a commercial waxed paper according to ASTM E-96 at 73 degrees F (23 degrees C) and 50 per cent relative humidity. The EcoShield Super Barrier Paper and Linerboard showed a water vapour transfer rate of 0.32 to 0.37 grams per hour on a square meter of paper. A polycoated paper in the same test allowed slightly more water vapour to pass through in the same time frame, at the higher rate of 0.47 to 0.71 grams per hour. The waxed paper was much less resistant to water vapour, allowing it to transfer at a rate of 6.5 to 6.9 grams per hour on the same size of paper.
Though it is not intended for applications involving constant water contact, the shiny side of EcoShield Super Barrier Paper and Linerboard also has the ability to repel liquid water. Its TAPPI T-441 Cobb Water Absorption rate is less than 0.3 grams of water per square meter in two minutes.
EcoShield Super Barrier Paper and Linerboard registers a high kit test value of 12, representing the highest amount of an aggressive liquid solution to remain on the paper surface without causing the paper to fail. The high gloss paper not only protects against the ingress of moisture or grease into a package, but it also protects against the leaching of oil and grease out of a package.
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