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MATERIALS | POLYOLEFINS


It says that Exceed XP 7021 and XP 7052 offer “a


combination of attributes” not currently available in a single resin – such as high elasticity and holding force, puncture energy and dart impact resistance. The grades also offer a combination of fractional MI and low density (0.911-0.912 g/cm³) not currently available, it said. This leads to films with enhanced bubble stability, while could help converters to increase output. The materials can be used to make films for


Above: Heavy duty sacks for industrial use are one potential application of ExxonMobil’s new Exceed S range of LLDPEs


This would be used in cases where the core layer is made from recyclate – which has less consistency than virgin resin. In these examples, the Exceed S skin would add stiffness – and reduce blocking – in applications such as industrial packaging. In one example of downgauging, ExxonMobil has investigated freezer film. Historically, this has been around 70 microns thick, and is typically 50-60 microns now. “We could easily reduce this to 35 or 40 microns


using Exceed S,” said Adam. Typical applications for the grades include


heavy-duty sacks for industrial and agricultural use and silo bags for farming – taking advantage of increased puncture, impact and tear resistance. In primary packaging, non-laminated coextruded films used in pouches and bags containing liquid, food or other goods benefit from improved toughness – and are less likely to break when transported or dropped.


Improved attributes Previous to this, ExxonMobil launched two new Exceed XP grades of PE that combine mechanical performance with features such as low density and fractional melt index (MI).


stretch hood packaging, collation shrink, primary packaging, and greenhouse applications. “They are designed to help create innovative solutions to meet specific applications needs,” said Michael Vinck, global polyethylene new products marketing manager at ExxonMobil. Producers of stretch hood packaging films, for


example, can benefit from high elastic recovery and high holding force. Collation shrink films can be made with high shrink speeds at temperatures as low as 120°C. The films can also be sealed at low temperatures.


Capacitor film Borealis and Topas Advanced Polymers are developing a new class of material for capacitor film – combining PP and cyclic olefin copolymers (COCs). The companies say that EPN (ethylene-propyl- ene-norbornene) will bridge the current perfor- mance gap between standard polymers and high-end plastics. By enabling higher film capacitor temperature resistance at lower cost, the material – when commercialised – will help improve power transformation and transmission, they added. When commercially available, the first applica- tions will be in traction inverters for electric mobility and inverters for solar and wind power. EPN will increase the temperature resistance of film capacitors by an estimated 20-35°C, compared to capacitors made of standard polymers. This will


each detail matters for unrivalled performance


Only a company who has a constant focus on the productivity of its customers thinks ahead and creates extrusion solutions that leave the rest standing. SML specialises in the development of extrusion lines for film, sheet, coating and lamination as well as multifilament spinning lines.


Extrusion lines – engineered to perform.


www.sml.at


IMAGE: EXXONMOBIL


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