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Moisture is a major threat to raw materials and finished goods of all kinds—particularly those made of metal and prone to rust and corrosion. Greases and oils sometimes used as lubricants or rust preventatives on metal components add another problem by threatening to leak through packaging and contaminating surrounding areas.

Waxed or polycoated papers are the traditional moisture-resistant packaging options for these problems, but they pose an environmental problem because they are not recyclable and repulpable. Even if recycled back into the pulp and paper stream, they would first have to go through a costly process of separating the paper base from the coating.

Cortec introduces environmentally friendly replacement for polycoated paper

Cortec Corporation has therefore developed an environmentally acceptable replacement. The high gloss EcoShield Super Barrier Paper and Linerboard relies on a water-based moisture barrier coating for moisture resistance. The paper is fully recyclable and repulpable without requiring costly processes to remove the coating from the paper.

This product can be used for a variety of packaging applications, including protecting moisture sensitive components, wrapping oily or greasy parts, lining wood pallets or corrugated boxes, packaging products, and keeping work surfaces clean with a disposable cover. EcoShield Super Barrier Paper and Linerboard is available in custom sizes and as sheets or perforated rolls.

During testing, the Super Barrier Paper and Linerboard demonstrated better water vapour barrier properties than polycoated paper and waxed paper. The barrier paper was tested against a comparable polyethylene coated paper and a commercial waxed paper according to ASTM E-96 at 73°F (23°C) and 50% relative humidity. The EcoShield Super Barrier Paper and Linerboard showed a water vapor transfer rate of 0.32-0.37 grams per hour on a square meter of paper. A polycoated paper in the same test allowed slightly more water vapor to pass through in the same time frame, at the higher rate of 0.47-0.71 grams per hour. The waxed paper was much less resistant to water vapor, allowing it to transfer at a rate of 6.5-6.9 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 metre in 2 minutes.

The product also has excellent oil and grease resistance. It 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. This is important when manufacturers’ specifications require the use of greasy rust preventatives, or when the metal equipment being wrapped, packaged, or shipped contains lubricated parts. EcoShield Super Barrier Paper and Linerboard can discourage these oils and greases from seeping out of the package and causing packaging failure or contamination of nearby materials.

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