Significantly lighter CO2 label material – from cradle to gate
Label Solutions Green Solutions
At Labelexpo 2023 (hall 5, stand C14), Herma will present a versatile self-adhesive material for labels that, in terms of the emission balance sheet, temporarily binds even more CO2 than is emitted for its production until it is delivered.
The emissions balance has been calculated by the climate protection specialist myclimate, taking into account the cradle to gate approach and the final disposal phase. At the same time, its calculation method has been critically reviewed by Carbotech, an independent specialist in lifecycle assessments.
‘The cradle to gate alone approach does not take into account the utilisation and disposal phases as we have no control over them,’ said Marcus Gablowski, chief sustainability officer. ‘Regardless of how the label is structured, the bound CO2 is released again when it is incinerated at the end of its lifecycle. But if it is recycled, for example, the bound CO2 remains in the material cycle for longer. This once again underscores the importance of material recycling.’
The new adhesive 71N plays a decisive role in achieving a good emissions balance. Herma has developed it in cooperation with BASF. According to the so-called biomass balance approach, the raw materials required for its production are partly based on biomass from organic waste instead of fossil raw materials. The appropriate plants have recently extracted the greenhouse gas CO2 from the atmosphere during their growth phase – a very welcome effect that is not available in fossil raw materials. As part of its certification, RedCert2 confirms that BASF actually replaces a defined proportion of fossil raw materials with renewable raw materials within its production processes.
‘The main premise for us in the development of the adhesive was of course to retain the quality properties. We have established and proven this in many series of tests,’ emphasised Dr Stefan Kissling, head of development of adhesives and special coatings for Herma's Self-Adhesive Materials Division. ‘The new adhesive 71N has excellent adhesive properties and can be easily processed.’
However, it was important for achieving the emissions balance target to take account of the use of renewable raw materials for all the main components of the new self-adhesive material. They absorbed CO2 from the atmosphere during the growth phase, thus storing it at least temporarily. ‘In close cooperation with our long standing suppliers, we have also selected a label and a backing material that is characterised by a very low carbon footprint even without taking the bound CO2 into account: solely through the use of the appropriate materials, we were able to reduce this value by about 20% compared to a conventional self-adhesive material, as calculations show,’ explained Marcus Gablowski.
The Hermacoat light (grade 238) label material used is suitable for sophisticated labels with multi-colour printing. The slightly glossy surface results in very good print quality in all conventional printing processes as well as in thermal transfer and laser printing. In general, Hermacoat light can also be printed with digital printing processes such as Xeikon and UV inkjet. The company recommends preliminary tests to this end. Brown, supercalendered glassine paper with the designation Herma PH (grade 500) is used for the backing material.
‘With the new self-adhesive material, we are therefore meeting the growing desire of label users to reduce the dependence and use of fossil raw materials in the supply chain for packaging and labelling materials,’ concluded Marcus Gablowski. ‘At the same time, it is an active contribution in terms of climate protection if as much CO2 is bound from the atmosphere as possible.’
