MATERIALS | POLYOLEFINS
cals told delegates how its Tafmer sealants can improve the performance of different types of packaging. One example is to improve sustainability, by allowing packaging to be made from PE only – which improves recyclability. Its Tafmer A, an ethylene-based copolymer, offers low seal initiation temperature (SIT), high impact resistance and high pin-hole resistance. A mix of 70% LLDPE with 30% Tafmer A showed a good balance of high seal strength and low SIT.
Light work
Above: KNF Flexpack used Baerlocher’s T-Blend
stabiliser to recycle more post-industrial film into its products
pressure and time cause two polymer surfaces to bond together. Some important properties for sealants include:
versatility – including good seal performance and easy processability; performance – including high hot tack and seal strength; caulkability; and high speed – including quick melting and setting. He said that Nova offers a number of sealants
that perform well in certain of these areas. For instance, its FP120 is a versatile sealant, while its VPSK914 performance sealant offers better hot tack and cold seal performance. In a ‘real’ nine-layer co-extruded film, a package for cheese – requiring a nylon barrier – will need different sealants to an all-PE film for packaging fruit. Nova tested these sealants in a number of scenarios. The performance sealant generally outperformed the versatility sealant – in areas including leak performance and lower seal onset temperature. “The selection of a sealant depends on the demands of the package,” he said. He said that Nova had developed novel test methods to evaluate and select appropriate sealant resins for real-world packaging applications. In similar fashion, Greg Griffin of Mitsui Chemi-
HVTSE® DryerLESS™ HVTSE® DryerLESS™
is an eco-friendly manufacturing solution, which delivers major energy savings and cost reduction.
Additives play an important role in improving the performance of polyolefin products, and several speakers explained how this has worked in practice. Michael McLaren of Ingenia Polymers in
Canada explained how the company developed a range of HALS-based masterbatch formulations for greenhouse film. Hindered amine light stabilisers (HALS) are used
to prevent UV damage in applications such as greenhouse film – in order to extend its lifetime. Ingenia’s objectives were to evaluate and benchmark HALS packages on the market, and develop mid-range and high performance HALS packages that also had pesticide resistance. Its IP1368 package offers optimised, mid-range performance, while its IP1369 offers higher performance – and is recommended for service lives of longer than four years. Both grades offer pesticide resistance – and can be used in typical applications where combinations of LDPE-EVA and LLDPE are used. “By thoroughly comparing the performance of
different types of HALS and synergistic additives, we have developed two packages for greenhouse films,” he said. Evaluation is continuing, with the packages
undergoing Xenon arc exposure to gather extra performance data, he said.
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