CONVERTING & BAGMAKING | MACHINERY
Recent advances in converting and bagmaking include advances in the production of battery film, developments in mono-material pouches and a multi-partner project to recycle big bags
Bagging a winner: converting/bagmaking
Despite a global war against single-use plastic shopping bags, demand for more durable bag products – such as those for packaging applica- tions – remains high. Similarly, converters of film – into products as diverse as stand-up pouches and battery film – are also reporting technical advances. Austrian packaging machinery supplier Starlinger showed a number of bagmaking solutions at Interpack 2023 recently. One example was a project involving Starlinger, big bag manufacturer LC Packaging, PET recycler PRT – part of Alpla Group – and Croatian recycler Velebit. Together, they will jointly implement a closed loop for big bags made of polypropylene (PP) later this year. The big bags, which PRT uses to transport and
store input materials and the rPET granules produced from them, are recycled into rPP pellets by Velebit on a Starlinger recycling plant. LC Packaging mixes the recycled pellets with virgin material and produces tape fabric which is con- verted to rPP big bags. The finished big bags are then supplied again to PRT. To make PP big bags, Starlinger processes
recycled PP – also from post-consumer waste – on its production lines. “Our customers are already producing big bags
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with recycled PP,” said Angelika Huemer, managing partner at Starlinger. “If the quality of the recycled material is good, high proportions of recycled content in this type of heavy-duty packaging, which has to fulfil special requirements, are no problem.” With the technology to make big bags from PET – as an alternative to PP – Starlinger can offer manufacturers in this packaging segment a solution for a closed packaging cycle. When properly recycled, rPET achieves properties like virgin resin and can be used up to 100% for the making packaging. Starlinger now allows a way to produce big bags from 100% recycled PET. Also at the show, a new Starlinger sack conver-
sion line, MultiKon KXservo, was seen producing IC*Star sacks. In the IC*Star production process, the cut sacks run through a welding device in which a coated sealing strip is welded onto the bottom of the sack in a continuous process using hot air in order to close it. IC*Star sacks are characterised by material-saving production, high strength and low packaging weight, says the company.
Cement sack Earlier – at last year’s K2022 – the company un- veiled what it called the “cement bag of the future”.
May 2023 | FILM & SHEET EXTRUSION 13
Main image: Starlinger block bottom valve bags with 22% recyclate, are made on its Ad*StarKon SXneo line
IMAGE: STARLINGER
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