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MATERIALS | MASTERBATCH Right:


Baerlocher’s Baeropol resin stabilisation technology (RST) was recently used in a demanding geomembranes application


Fluorescent food Oliver Frederix, marketing manager at Radiant Color of Belgium, told delegates that his compa- ny’s fluorescent pigments could also be used in food contact applications. These pigments can offer higher visibility on the shelf, as well as having a more ‘stylish’ appearance. “Despite these advantages, fluorescent pigments


are still uncommon in the food industry because of unsafe options and customer perception,” he said. He said that Radiant’s Radglo RPCF fluorescent additives have been proven safe for use with food, as each element component has been thoroughly tested. Three colours are currently available (chartreuse,


orange-red and magenta) with two more in development (green and pink).


Non-silver bullet Gregory Coue, technical manager at Kompuestos of Spain, explained how the company had devel- oped anti-microbial masterbatches for food contact applications. The company has a range of antimicrobials that use silver ions as the active ingredient. Typically, a masterabatch loaded with 30% of the active ingredient is used in applications. While this is effective – against many types of organism, and with high resistance to ageing – it is not food approved. There are also concerns about migration of


anti-microbial ingredients into food. At the same time, silver ions lose their anti-microbial effect when in contact with high-protein foods such as raw chicken. Kompuestos has developed a series of anti-


microbials for direct food contact. These avoid the growth of mould and bacteria, comply with food regulations and do not change the organoleptic properties of the food. Kombact-010SF is a masterbatch loaded with 10%


of a silver-free anti-microbial agent. It is effective against a range of bacteria, including Campylobacter jejuni – which can be found in chicken. The master- batch was used to make LDPE film – at loading of 10-20% – and kept microbes to a minimum. “Activity is completely maintained, even in contact with protein-rich food,” said Coue.


Superior dispersion Christina Normann Christensen, application scientist for non-food at Palsgaard of Denmark, explained how the company had developed a new range of plant-based pigment-dispersing aids. Its Einar range of additives also includes anti-


32 FILM & SHEET EXTRUSION | July/August 2019


fogging and anti-static agents. Its new dispersing aids are naturally derived fatty acid esters, she said. Einar 101, the colour dispersant, is used to


create a coated pigment premix, before blending with LLDPE powder to create a compound mix. Compared with a mix made using PE wax, it showed a reduced filter pressure value (FPV) – re- sulting in superior dispersion. The advantage over PE wax was particularly pronounced at lower loadings (around 5%). For loadings of 10 and 15%, the performance of Einar and PE wax was more similar – though Einar was still superior, she said. n The next edition of Masterbatch takes place in Vienna, Austria in September. For more details, contact Camille Lemercier (camille.lemercier@ami. international) on +44 (0) 117 314 8111.


Stable over time Baerlocher says that its Baeropol resin stabilisation technology (RST) was recently used in a demand- ing geomembranes application. Two RST grades were supplied to Canada-based masterbatch manufacturer FD Plastics, which then used them to help a customer solve plate-out issues and meet stringent oxidative induction time (OIT) requirements. In the first case, its DRS 6812 polyolefin stabiliser was used in FD’s LLDPE masterbatches to replace phosphite anti-oxidants. These had been leaching out of solution and causing several issues– includ- ing irritation to workers’ hands, and part rejects. This meant that production was interrupted, due to the need for frequent cleaning. The new grade overcame these problems, due to several factors: its higher solubility; the ability to use it in GRAS (generally recognised as safe) applications; and its availability as low-dust sprayed prills, which reduced airborne particles. “It provided an environmentally safe, cost-effec- tive additive that allowed us to address some of


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