IN Brief:
- CarbonLite PurePP has been developed for cold-filled drinkable yoghurt and other sensitive dairy applications.
- The PP structure supports UVC or hydrogen-peroxide treatment, high-cycle filling, configurable oxygen and moisture barriers, and secure spout sealing.
- Cyclos-HTP has certified 96% recyclability for CarbonLite Spouted Pouch PurePP.
SÜDPACK has extended its CarbonLite PurePP spouted-pouch system into drinkable yoghurt and other sensitive dairy applications, combining a mono-polypropylene structure with cold-fill processing requirements and independently certified recyclability.
The film has been developed for processes that can include UVC or hydrogen-peroxide treatment and is designed to retain sealing performance at high cycle rates. Oxygen and water-vapour barriers can be configured according to the product and required shelf life, while the PP spout is integrated during pouch manufacture.
SÜDPACK says the CarbonLite Spouted Pouch PurePP structure has achieved 96% recyclability in testing by the cyclos-HTP Institute. The figure is more precise than the broad “more than 95%” threshold commonly used in packaging communications and applies to the company’s specified PP pouch structure.
Drinkable yoghurt puts several competing demands on a pack. The material has to support hygienic filling, resist oxygen and moisture transfer, maintain seal integrity through chilled storage and distribution, and run consistently enough that line speed and rejects do not cancel out any material savings.
That combination explains why replacing conventional laminates is harder than substituting one polymer for another. Multi-layer structures have traditionally used different materials because each contributes a particular mechanical, sealing, or barrier property, while aluminium and specialised coatings can substantially improve protection for sensitive products.
A predominantly PP design pushes more of those functions into the engineering of the film, barrier layers, sealing surfaces, and closure. Those elements then have to behave as one system on the packaging line rather than simply satisfying recyclability criteria in isolation.
PPWR implementation is already forcing food businesses to examine packaging structures more closely, with recyclability, material reduction, technical documentation, and supplier evidence increasingly tied to individual packaging specifications rather than broad corporate sustainability targets.
For dairy processors, changing a pack can trigger a long validation chain. New material may alter sealing temperatures, dwell times, machine settings, sterilisation treatment, leak-test performance, pack stiffness, line efficiency, shelf life, secondary packaging, and distribution behaviour before a commercial change can be approved.
SÜDPACK says the PurePP structure offers a wide processing window and is suitable for use with standard filling lines after pouch production. MENSHEN LoTUS spouts are inserted during pouch manufacture before the finished packs are stored in rail systems and transferred to filling equipment.
The wider CarbonLite concept can also be integrated with in-house pouch production. SÜDPACK has worked with SN Maschinenbau and MENSHEN on a system that converts rollstock into spouted pouches before filling, creating an alternative to purchasing and storing large volumes of premade empty packs.
Bringing pouch conversion into a factory can reduce some logistics and storage demands, but it adds machinery, maintenance, process control, and operator requirements of its own. The economics will therefore depend on volume, format variety, changeovers, material utilisation, and whether the converter or food manufacturer can keep the equipment sufficiently loaded.
Recyclability also remains dependent on collection and recovery infrastructure. A pack designed around one polymer is easier to sort and process in principle, but the practical outcome still varies with national collection systems, sorting technology, acceptance of flexible polypropylene, contamination levels, and the economics of recycled output.
The 96% certification is therefore one part of the specification rather than the end of the engineering exercise. Dairy manufacturers still have to compare material cost, production waste, throughput, product protection, and recovery conditions with the bottle, cup, or laminate structures already used for similar products.
Flexible spouted pouches offer clear weight and material advantages where the filling and recovery systems support them, but commercial success will depend on whether those gains survive the factory. A theoretically recyclable structure that increases rejects, slows the line, or compromises shelf life would be a fairly expensive route to a better recycling score.
The next useful evidence will come from sustained dairy production rather than packaging trials: commercial line speeds, seal-failure rates, material consumption, shelf-life performance, and the proportion of packs that actually reach an effective polypropylene recycling stream.
