ADDITIVES | HIGH DENSITY COMPOUNDS
products find their fit in the existing market between natural magnetite and synthetic magnet- ite,” Viering says. “In addition, one of the future developments being worked on is the addition of MagniF in polymer compounds to support recycla- bility. Specifically, there will be new solutions to support the recycling of single use plastic in packaging, for example, which continues to be a high priority for the industry.” Among producers of density modified formula-
Above: This cable tie for food industry applications is produced using Magnif
magnetite filler
MagniF is also microwave heatable. According to Lammertink, MagniF-filled polymers are straightfor- ward to compound and to mould or extrude. They are suitable for sound and vibration dampening applications within the automotive industry. “As a very pure additive made from magnetite, MagniF has been used for decades in high density compounds in areas that need sound and vibration damping or polymer-based products that need a quality feel,” he says. “MagniF offers a high density of 5.2 g/cm3
. It is both electrically and thermally
conductive and provides a high specific heat capacity. Filler levels above 80% by weight are achievable with standard compounding equipment resulting in compound densities of up to 3 g/cm3
in
Right: Premium packaging applications such as cosmetics benefit from the haptics of high density polymer compounds
polypropylene. Compounding is straightforward as MagniF has a low influence on viscosity and behaves isotropically.” According to Stefan Viering, R&D Project Engineer at LKAB Minerals, there are a number of market factors driving new trends in high density compounds at present, including improved heat transfer in polymers and additional food contact requirements. “LKAB offers MagniF F-grades that are very pure and comply with FDA and EC directives for food contact applications. On the technical front, the market also continues to request optimal mechanical properties, easy processing and handling and tailor-made cost/ performance balanced products,” he says. “LKAB Minerals has developed new cost-effi- cient MagniF products for sound damping sheets in appliances and automotive applications. Another example of a MagniF application is thin packaging films in the meat and bakery industry that require metal detectability,” he says. The newly developed MagniF UF series provides good metal detectability in thin packaging film structures. The products offer a very narrow particle size distribution, providing improved mechanical, aesthetical and processing properties. “The
68 COMPOUNDING WORLD | May 2019
tions, PolyOne Corporation reports finding applications in the speciality packaging sector, where its Gravi-Tech compounds are adding weight and aesthetics to luxury closure designs. The company says consumers of luxury cosmetics and spirits tend to perceive added-value in packaging that incorporates weight, aesthetics, and visual surface effects into the closure. When designing these in metals such as aluminium, zinc, iron, steel or other alloys, there are usually processing challenges and complexities to be faced. Injection mouldable Gravi-Tech density modified formula- tions can help achieve the evenly distributed weight, complex designs and visual surface effects of metal without the extra costs and steps associ- ated with die cast mould tooling or secondary assembly operations. For brand owners, PolyOne says the advantages
of Gravi-Tech mean that a weighted closure for a luxury brand product can be created that can be up to four times the weight of aluminium. Complex designs are possible without expensive tooling as Gravi-Tech can be injection moulded using lower cost moulds made of P20 or H13 steel. Visual surface effects and aesthetics can be added without difficulty. Various aesthetic appearances can also be achieved, including colour variation, metallic finishes, or marbling and swirling. Gravi-
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PHOTO: LKAB MINERALS
PHOTO: POLYONE
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