Sustainable Converting

A new take on bottle-to-bottle:Processing of detergent bottles by recycling technology


t is hard to imagine packaging without the use of plastics. Whether it is shampoo, shower gels, liquid laundry detergents or household

cleaners, everything reaches the supermarket shelves in containers made of PP, HDPE, or PET. However, in contrast to PET bottles, for which extensive collection systems have partly been set up, the collection of used containers made of polyolefins is still in its early stages. One reason for the lack of effort in this area lies in the complicated recycling process of plastic containers that were filled with detergents, due to migrated substances, the plastic, and in turn the recycled material, takes on an unpleasant odour.

PIONEERING WORK IN ODOUR REDUCTION The call for sustainable packaging solutions for polyolefins — especially by brand manufacturers — prompted Starlinger to engage with this topic on a deeper level. Over the last few years, Starlinger has engineered a project for the recycling of the input material of a renowned European recycler. The material came from detergent bottles from a postconsumer collection that had maintained a persistent odour of dishwashing or laundry detergent, even after undergoing a shredding and washing process. The goal was to produce high-quality

regranulate and to remove the strong smell. In addition, Starlinger did not want the regranulate to entail qualitative losses compared to products made from virgin material. Taking these requirements into account, Starlinger started a test production during which more than 100 tons of HDPE post-consumer materials were processed. The subsequent production of bottles from 100 per cent rHDPE fulfilled all expectations. During test production, samples were extracted

and sent to a German laboratory for analysis. The analysis consisted of an olfactory test with human participants and a physical analytical method called gas chromatography. The knowledge obtained through this analysis enabled Starlinger to optimise the recycling process, and thus the final product, one step at a time. As a result, the material was fit to be reused in the production of laundry or dishwashing detergent bottles: a new take on bottle-to-bottle recycling.

HDPE DETERGENT BOTTLE MADE FROM 100 PER CENT ODOURLESS RECYCLATE A special characteristic of odour reduction is its permanent nature. While conventional processes merely bind odours through the use of additives, therefore enclosing them in the final pellets, Starlinger’s odour reduction process permanently

Unveiling of newrecyclable premium paper

removes the substances causing the unwanted smell. In part, this removal already occurs during material preparation in the SMART feeder of the recycling line recoSTAR dynamic, as well as during degassing with the highly efficient C-VAC.

for the luxury packaging market that is both recyclable and compostable. The CenturaPack range was launched at

S 22

Packaging Innovations in London, September 13- 14. SPB partnered with speciality card, paper and board manufacturer, Slater Harrison, to develop the range, which is an environmentally strong alternative to metallised polyester (Metpol). CenturaPack is a combination of Slater’s

Centura pearl and metallic coatings, delivering a surface for paper or board. Notably the solution does not contain film or foil and is suitable for most printing methods.

October 2017

wanline Paper & Board (SPB) has collaborated with Slater Harrison to develop a metallic effect paper and board

James Braddock, production director, Slater

Harrison, says, “Working alongside SPB has allowed us to create a premium alternative that rivals existing products by offering a point of difference. We believe the CenturaPack range creates an air of absolute distinction, finishing products and packaging with a memorable creative flourish to showcase the essence of a brand.” CenturaPack is ideal for coated materials used

in the creation of luxury and tactile packaging, rigid printed tubes, creative cartons and matching self-adhesive labels for the food and beverage, and personal care markets. The combination of materials means the range

has eco-credentials, is non- acidic and non-metallic, biodegradable, compostable and recyclable.

Ross Griffin, managing director at SPB, adds,

“CenturaPack is an outstanding example of innovation delivering a truly sustainable solution for the luxury packaging and POS markets. If the coating is applied to the surface of a recycled substrate, such as white lined chipboard, we have a completely recycled and recyclable combination that is not only aesthetically pleasing, but functional for all packaging applications.” Slater Harrison is a manufacturer of speciality

coated paper and board products for use in educational and decorative packaging applications. The company also develops laminated boards for picture framing and POS markets, and specialises in short and bespoke runs.

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