Right: One of the first


applications of Treofan’s BOPP/paper packaging is a professional shampoo brand


materials | Plastic pouches Anti-block additives can have a


negative effect on metallisation, he said, by creating a ‘rough’ surface. “Almost every big particle creates a


pinhole in the metal layer during winding and unwinding,” said Koppers. A coating of nanoparticles can mask this effect, and reduce surface defects – improving the barrier properties and printability. In once instance, an anti-block nano-layer had reduced haze from 2% to 0.2%, boosted the oxygen barrier threefold and reduced the amount of surface defects to around one-fifth of their original area. BOPET can be used to replace all types of packaging medium, from glass and metal to other types of plastics (such as in ketchup bottles).


Renewable materials Constantia Flexibles has developed a high barrier pouch using renewable materials. The pouch is a combination of paper and Metalvuoto’s coated propyl- ester PLA. It is suitable for four-side seal machines and is aimed at applications such as coffee and nutritional supplements. Gianni Costanzo, sales director of Metalvuoto, said


Below: BASF says the low crystallinity of its Ultramid C37LC gives it properties


including a lack of undesired curling


that its new generation of bio-coating offers high barrier properties while being certified as bio-based. “Barrier properties are usually thanks to a combina- tion of many layers,” he said. “Now, only one coating has the same properties as many layers – with a considerable reduction of thickness.” He said that the company’s OxAqua technology


combines the PLA layer and the coating, to produce a film with high barrier and sealability. For instance, he pointed to a typical ‘triplex’ package


for dried food, incorporating paper, aluminium and plastic – which could be replaced with a Metalvuoto film that is metallised on one side, and coated with Oxaqua on the other. “The propylester PLA film allows a


two-layer pouch – with performance matching that of earlier three-layer pouches, without aluminium foil,” he said.


Hybrid success At Interpack recently, Treofan unveiled the first commercial application of its film-paper hybrid packaging solution HybraPack.


Swiss company Trinity Haircare will use the technol-


ogy to make stand-up pouches for its professional hair care products. HybraPack, jointly developed with paper manufac-


turer Feldmuehle Uetersen, combines the performance of BOPP film with the optical and tactile characteristics of paper. Packaging made from this material is leakproof, with a high barrier. “HybraPack makes it possible to exploit the advan-


tages of BOPP and PAL film for liquid and paste package contents,” said Jürgen Schischko, technical service manager at Treofan. “We are aiming to open up new product segments in the upright pouch market, which is currently seeing double digit growth.” Prior to this, Treofan developed a five-layer metal- lised BOPP film that uses Vistamaxx polymers from ExxonMobil in the heat sealable side of the film in order to improve the sealing properties. It helped to simplify the laminate structure, remove


the need for aluminium foil and reduce costs in comparison with alternatives. Treofan was looking to develop a new BOPP film for packaging instant soups, but would also be suited to other kinds of dehydrated powdered product such as spice blends or instant sauces. The film, called Treofan MSB 30, replaces the aluminium foil and PE sealant normally found in this type of packaging. On the outside of a soup pouch, many brand owners prefer printed paper. Here, a reverse printed BOPP film or a printed PET film can be applied. “Vistamaxx performance polymers are key to the


development of Treofan MSB 30,” said Paul-René Clauss, sales developer for Vistamaxx performance polymers at ExxonMobil Chemical. “They enable the laminate structure to be simplified, while boosting sealing performance.”


38 FILM & SHEET EXTRUSION | June 2017 www.filmandsheet.com


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