MATERIALS | BARRIER FILM
Right: Mondi used its BarrierPack Recyclable material to develop mono-material flexible plastic packaging for Finish dish- washer tablets
filmic solution or, to be used in laminate construc- tions to be ‘recycle ready’, or recyclable in countries with the infrastructure to recycle polypropylene.” To make the Wildcorn pack, a lamination of
Propafilm Strata and a white cavitated OPP was used. This construction was also tested by In- terseroh, who confirmed it was fully recyclable. Propafilm Strata provides an effective barrier to
aroma, mineral oils and oxygen even at high relative humidity levels, ensuring increased shelf life and reduced food waste. It is glossy, is food contact compliant and chlorine free. The film is suitable for use in a range of markets, is printable and offers a wide seal and hot tack range.
Below: Several Dow resins have been used to make barrier
pouches that are highly recyclable
Mono-material barrier At K2019 last year,Dow showcased a selection of PE-based pouches – with medium-to-high barrier – in a joint project with Bobst, Hosokawa Alpine and packaging producer Elba. The packaging was made with machine direc- tion oriented (MDO) films that are designed for recyclability. “One of the biggest challenges in designing PE-based packaging for recyclability is to incorpo- rate barrier functionalities that are today carried out by different materials in multi- material struc- tures,” said Jaroslaw Jelinek, EMEA marketing manager at Dow Packaging & Specialty Plastics. “We have developed our next generation of resins to enable the production of PE-based mono-mate- rial packaging solutions.” The combination of MDO conversion machinery with Dow’s PE-based polymers gave similar production efficiency to existing multi-material packaging structures, said the company. A number of Dow products were used in the
solution. Its Elite resins offer high stiffness, thermal resistance, good clarity and a wide enough orienta- tion window – which is important for the MDO process – while its Nucrel copolymers create a
suitable surface for the coating and metallisation. Innate resins add balanced toughness and stiffness – plus higher dimensional performance – while Affinity sealants provide a low seal temperature and a good operating window on the packaging line.
Barrier labal
Barrier in-mould labels from Verstraete have been used to maintain freshness in a variety of products. The problem with many foods – especially something like a fresh pasta sauce – is that it will quicky degrade if any oxygen enters the package. One example was BC Gourmet USA, with its Scarpetta brand. “We were using citric acid to maintain freshness, but it took something away from the taste of the sauce,” said Paolo Volpati-Kedra, the company’s CEO. “We knew there had to be a way to bring it back.” The answer was to combine the Berry Global 410 Plus+ container with Oxygen Barrier IML labels from Verstraete. “The Oxygen Barrier IML is a unique IML label
that incorporates a special ethylene vinyl alcohol (EVOH) layer to reduce its permeability to oxygen,” said Thomas Coene, regional sales manager for Verstraete IML in North America. “As a genuine wraparound label, stretching from
the brim, across the sides and around base to cover the entire exterior of the container, it dra- matically reduces the oxygen transmission rate. In fact, the OTR is about 100 times better than with a regular label.”
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.mondigroup.com �
www.innoviafilms.com �
www.dow.com �
www.bobst.com �
www.hosokawa-alpine.com �
www.verstraete-iml.com
42 FILM & SHEET EXTRUSION | May 2020
www.filmandsheet.com
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