BOTTLE MAKING 20 PETplanet Insider Vol. 24 No. 11/23 www.petpla.net An ‘on-fi eld’ approach by Sacmi Bottle design for sustainability The availability of advanced instrumentation and pilot lines means that every solution developed by the laboratory, together with customers, can be tested in the field to validate the performance of the cap, preform and blow moulded container. BOTTLE MAKING Functional and elegant design, lightweight and sustainable. With an increasing proportion – which is growing in Europe because of regulations – of recycled resin. This is modern beverage packaging. Technological challenge The lightweighting of containers and the increasing use of recycled resins (especially rPET) pose significant technological challenges. The first is to create a technical-structural design that brings the characteristics of the lightweight bottle as close as possible to the required functional specifications and which provides a traditional consumption experience for the customer. The second involves the process, in terms of the increasing amount of recyclate in the mixtures, which compared to a virgin resin, is highly variable in terms of quality, viscosity, etc. For more than 10 years, Sacmi has been investing in developing blow-moulding technology. Robust, reliable, high-performance machines ready to take on the challenge of new lightweight containers and/or those made with up to 100% recycled material. Sacmi has tested various solutions in the current supply chain, first on still water containers and then on CSD containers, which is equally challenging due to the high quality and sealing performance required for carbonated beverage containers. The proposal Resin testing and analysis, advanced technologies for both preform production (IPS, injection preform system) and blow moulding (SBF rotary blow moulding machines also available in combination with the filling line), allow Sacmi to work on the design, optimise it according to the customer’s needs and to develop ad hoc solutions based on commercial requirements. This ability delivers advantages in terms of time-to-market, with the possibility of fast prototype development (also using new 3D moulding techniques) and testing the prototypes of the blow moulded container on the actual line. Carrying out comprehensive trials and tests at this point minimises the risk of functional issues and faults at a later stage, such as after blowing, and having produced entire batches of incorrect bottles. Sacmi has integrated the PVS156 intensive quality control system, produced by Sacmi Computer Vision, directly into its preform press, to provide an additional guarantee of perfect production results and improved process control. Sacmi’s research into moulds and blow moulding tools has resulted in the development of lowpressure bottoms. A patented Sacmi system reducing the consumption of compressed air. Design from a lightweight and recycling perspective The key aspect of the offer, which Sacmi makes available to customers through the new Sacmi Beverage Packaging Centre – which in turn makes use of the skills of the Group’s Beverage and Rigid Packaging Laboratories – was identifying a specific ‘design key’ to create lighter bottle designs while maintaining both a high aesthetics and performance characteristics. The latter is an integrated approach that includes the configuration of the neck and cap, and the structure of the bottle itself once it has been blown, right up to the design of the moulds, which is also carried out using advanced simulation techniques such as finite element analysis (FEM analysis). In all cases, the result is not limited to a paper copy; it is prototyped and industrially tested either using test benches and simulators or using anthropomorphic robots that simulate the behaviour of the actual machine. Some success stories Bottle design for sustainability is the best possible compromise
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