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25. March 2007

GLS introduces new line of barrier TPE alloys

GLS Corporation based in McHenry, IL, USA, has recently introduced a new TPE alloy technology suite that is said to feature very good barrier properties. Target applications in food and beverage packaging include beverage closures, flexible food packaging films, and other storage containers, as well as medical applications requiring package barrier integrity such as vial stoppers and medical films for IV bags. The key benefit of this technology is barrier to oxygen and moisture vapour transmission rate (MVTR). The oxygen permeation coefficients of the new TPE alloys range from 2,000 to 20,000cc.mil/m2.day.atm at 23°C. Standard TPE oxygen barrier is typically in the range of 50,000 to 90,000cc.mil/m2.day.atm at 23°C. And the MVTR is in the range of 2.3 to 3.8g/m2.day at 38°C/100% RH. The use of this technology could provide according to GLS a boost in 2x to 5x increase in shelf-life over conventional materials, and covers a broad range to accommodate packaging and storing a wide variety of food, beverage, and medical products. Conventional barrier packaging typically requires thermoset rubbers, separate barrier layers, or second-step barrier packaging operations to provide the required barrier properties. These new TPE alloys provide an alternative to those processes. Special features of the grades include ease of processing in conventional injection moulding, blow moulding, and extrusion thermoplastic pro­cessing me­thods, and at a very consistent quality. Some of the grades offered are translucent which could be of great value in aesthetic appeal of packaging and are easy to colour. The technology ranges in hardness from Shore A 40 to 90.

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