MATERIALS | STRETCH AND SHRINK FILM
Right: Dow’s Reveloop materials include 70% recycled PE, and are aimed at manufactur- ers of collation film
tonnes/year of LDPE and LLDPE from recyclate. One source of this is natural, unprinted stretch and shrink film. The technology needed to produce its recycled LDPE and LLDPE includes a two-step filtration process down to 50 microns. Fine filtration helps to improve performance during film extrusion, reduce contamination and improve film optics. One example of a product made with this
material is a 60-micron thick collation shrink film – with 50% recycled content – from Plastigaur. The film has good thickness stability, better printability than standard PCR-containing grades and consist- ent line performance, he said. The PCR materials were also used to make
17-micron and 23-micron film with 30% recycled content. These cast stretch films showed good wrap consistency, good optical properties and no film breaks during production. “Because these are fine-filtered recyclates, there is a lower filter pressure increase than with single- step filtered PCRs,” said Pellejer. He added that a collation shrink film with 50% PCR saves around 960kg CO2 for every tonne of film produced, while a 30% PCR film would save around
575kg CO2 per tonne of film. Environmental metrics – such as soil acidification and ozone depletion – were as much as 50% lower when using 50% PCR film, and 20-30% lower for 30% PCR content.
Recycled content Dow has developed a new product range for manufacturers of collation film – which incorporates 70% post-consumer recycled (PCR) polyethylene (PE).
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IMAGE: SHUTTERSTOCK
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