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    KRN   DE0006335003

KRONES AG

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Krones : Returnable PET for sensitive beverages?

09/01/2021 | 03:52am EDT
  • Despite attractive environmental credentials, returnable PET containers remain a niche product.
  • Krones and Alpla are cooperating on a research project aimed at better realizing this packaging type's potential.
  • The result is a returnable PET container specially designed for chilled juices and dairy products.
  • Objective tests provide information about microbiological safety.

Rising out of the niche: In the beverage packaging market, returnable PET containers currently play a rather small role. Wrongly so, say the results of a joint research project of Krones and Alpla. In the project's first phase, the material and process parameters underwent a comprehensive scientific evaluation. Based on these findings, Krones and Alpla developed a returnable PET container that provides an optimal environment for sensitive ESL (Extended Shelf Life) products such as juice and milk in the cold chain.

Be it due to regulations, voluntary climate targets, or growing environmental awareness among consumers, sustainability issues are becoming an increasingly important factor in packaging choice. 'Which type of packaging performs best from an ecological perspective depends on a number of factors and must be evaluated individually for each use case,' explains Martina Birk, who is responsible for the enviro sustainability programme at Krones. But returnable PET containers often don't even enter into consideration in the first place. 'And yet they can offer outstanding environmental performance, especially if they are distributed mainly regionally,' emphasises Birk.

Bottle samples and cleaning processes tested

Krones and Alpla teamed up to make these benefits available for use for a wide range of beverages. 'Until now, the main applications for returnable PET containers have been carbonated soft drinks and water,' explains Jörg Schwärzler, returnables expert and project lead at Alpla. 'But we were certain that, if we combined our expertise in materials science, preform design, container design, and systems engineering, we could find a solution for sensitive beverages like juices and dairy products. The option of using a 38-millimeter bottle neck offers particular advantages for sensitive returnable applications.'

The partners dedicated particular attention to the container cleaning process because 'PET is less heat-resistant than glass,' explains developer Ines Bradshaw. 'So we had to find a way to ensure both a high level of microbiological safety and a high number of use cycles while cleaning at lower temperatures.'

To obtain an objective and meaningful base of data, Krones' development plant for washing technology in Flensburg carried out an elaborate series of tests, analysing the interaction of different bottle designs and cleaning processes. 'The tests provided us with a very clear picture of the respective thermal, chemical, and mechanical factors,' says Bradshaw. 'Among the findings: With the right combination of parameters - especially lye concentration, temperature, additive, and mechanical impact - temperatures around 60 °C are sufficient to reliably remove even dried protein, fat, and starch contamination from the containers.'

Direct comparison with returnable glass

A direct comparison of returnable PET and returnable glass brought to light another interesting discovery: Over the course of several cleaning cycles, the alkaline cleaning medium visibly roughened the surface of the glass bottle, whereas nothing comparable could be observed with the PET containers. 'For the filling of sensitive beverages in particular, consistent container quality can be an advantage that should not be underestimated,' notes Ines Bradshaw.

Microbiological tests are currently being conducted to definitively establish whether the technology is safe. Initial results confirm the observations made thus far: 'Microbiologically, PET bottles that had gone through 25 cycles could not be distinguished from new ones,' says a very pleased Ines Bradshaw. With this proof of concept, the project has reached an important milestone and is now ready for the next major step: Preparations are already well underway for the technical field test.

About the project partners

Krones supplies customers in the international beverage and food industry with everything they need for their value creation. With its enviro sustainability programme, the group is driving the development of more energy- and media-efficient technologies and more environmentally friendly packaging.

Alpla is one of the leading companies involved in plastic packaging. Around 21,600 employees worldwide produce custom-made packaging systems, bottles, closures, and moulded parts at 178 sites across 45 countries.

Disclaimer

Krones AG published this content on 01 September 2021 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 01 September 2021 07:51:05 UTC.


ę Publicnow 2021
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Volker Kronseder Chairman-Supervisory Board
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