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MATERIALS | FILM ADDITIVES


Film layer thicknesses (microns)


8/4/8


22/6/22 20/10/20 50/50/50 70/10/70


Dart impact strength (g)


55-60 230


90-95 100 800


Avg. MD tear resistance (g)


412.5


1215.7 895.7 443.3 >3200


Avg. TD tear resistance (g)


625


1870 526.7


1345.7 >3200


OTR @23°C, 0%RH (cµm3/m2/24h)


66 48 23 64 25


Mechanical properties and oxygen transmission rates of films produced with Tosaf’s BR7503PE/BR7562PE. The masterbatch was added to the core layer at 70%, except for the fourth film, where it was added at 50% owing to the high core layer thickness Source: Tosaf


market references in blown films, according to the company.


Below: Improved anti-fog, UV barrier and extended lifetimes are some of the benefits available to agricultural film producers


Some outdoor applications, such as greenhouse and low tunnel film, silage stretch wrapping film and industrial packaging, require the combined use of processing aids and hindered amine light stabilisers (HALS) to allow the use of high-perfor- mance resins while extending the service life of the film. However, the HALS may affect the efficiency of the processing aids. Ampacet designed Proflow 1000400-E for optimised performance in the presence of UV light stabilisers. “It demonstrates minimised interactions with various UV HALS stabilisers, with excellent results in preventing die build-up and shark skin effects,” says the company. Last year, PolyOne said it had been collaborat- ing with agricultural films manufacturers to help growers reduce food waste by incorporating OnCap anti-fog additives into their films. “Agricul- tural films manufactured with OnCap anti-fog additive solutions help reduce the possibility of condensed water falling on growing fruits and vegetables,” says Christoph Palm, Vice President and General Manager, Color and Additives EMEA & India for the company. “The same attributes that reduce fog from forming on the films used to pack fresh foods for display in stores also create tremen- dous value for farmers growing fresh produce by reducing the possibility of condensed water


contacting the produce.” OnCap anti-fog concentrates are said to be easy to handle and can be added at a film extrusion machine with no extra equipment required.


Improving barriers Staying with agricultural film, BR7503PE and BR7562PE are new PE-based masterbatches from Tosaf that provide a high barrier to oxygen and fumigants. They enable production of barrier silage and mulch films using a three-layer extrusion line. BR7503PE is intended for blown film where bubble stability is crucial, while BR7562PE is for cast film or where sealing is needed. Agricultural barrier films most frequently use


EVOH in the barrier layer and, because it is incom- patible with polyethylene, a tie layer is required. The accepted method for producing these films involves a five-layer extruder. “Film producers that do not have suitable extruders find themselves out of the barrier film market,” says Agriculture Product Manager Dr Meirav Fleischer. The new masterbatch- es are in advanced approval stages with customers. Tosaf has also launched a UV masterbatch, UV8915PE, with high chemical resistance. This is in response to demand for agrifilms with longer lifetimes, even when used with high concentrations of pesticides. It enables the production of green- house film with a three-year useful life and capable of withstanding up to 5,000 ppm of sulphur, which is commonly used for greenhouse fumigation. Greenhouse film typically withstands a maximum of 3,000 ppm over the same period.


CLICK ON THE LINKS FOR MORE INFORMATION: � https://consumer.dow.com � http://www.dupont.com/industrial/multibase.html � www.ampacet.com � www.crodapolymeradditives.com � www.kafrit.com � www.polyfilcorp.com � www.tosaf.com � www.polyone.com


30 COMPOUNDING WORLD | January 2019 www.compoundingworld.com


PHOTO: SHUTTERSTOCK


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