PETpla.net Insider 11 / 2019

MOULD MAKING PET planet Insider Vol. 20 No. 11/19 www.petpla.net 18 MOULD MAKING It is not working without: moulds Mould making, a review The PET bottle is a product that has been optimised over the last years and is constantly evolving. Different development steps have to be led back thereby on mould technology which made it over the years possible to fulfil producers and customers inquiries. The requirements to the mould makers are accordingly manifold. The following criteria are particularly important for closure and perform mould maker: a high degree of standardisation and modularisation of the tools, which allow a high degree of flexibility in order to quickly change the design or to expand the mould variation. High-precision production with guaranteed production cycles and production times; this in turn depends on material technology and processing. High surface and wear protection must also be guaranteed as well as minimal maintenance and a fast change over. A modern machine park must have a high degree of automation. This includes high-speed milling, electric discharge machining and CNC grinding. The peculiarities and challenges of the production of stretch blow moulds you can read on page 26. Closure moulds: z-mould’s high-cavity injection moulds have a high degree of stand- ardisation and modularity which guar- antees low-maintenance moulds, easy handling and flexibility. The patented z-slides mould technology for closures with tamper-evident band combines all essential market qualities in one product. Stack moulds, moulds with unscrewing function, flip-top moulds with in mould closing are produced on up to 144 cavities. Carbonated and non-carbonated drinks, water, juices and beer, as well as coffee & tea and dairy are filling application goods. Also edible oil, soy sauces and other fillings are possible. The lowest closer weight is 0.7 g. All single-piece stand- ard closure dimensions for all neck finishes, sport closures, flip tops, push pulls, and multi component closures can be produced in HDPE, LDPE, PP or TPE on moulds with a cavity from 16-128. www.z-moulds.com Corvaglia has been offering clo- sure solutions for PET bottles since 1991. A modular approach to injec- tion moulding comes with significant advantages. It is flexible, whether to modify the mould or to replace certain parts. With a state of the art machine park, Corvaglia produces moulds with selected materials, an own cool- ing technology and special surface finishes. Closures can be produced for the following products: for still, carbonated, pressurised and non pressurised, milk, juice, tea, coffee, beer and energy drinks, and also for edible oil and detergents. Closures weight starts at 0.8 g. Made out of HDPE and PP for transparent parts, flat top and sport closures for bever- age from 25-48mm neck finished can be produced. Corvaglia offers moulds with cavities from 24-96. www.corvaglia.com Preform and stretch blow moulds: GDXL Precise Machinery was founded in 1993. It is a high tech enterprise of moulding equipment to the PET plastic industry. The com- pany designs and manufactures PET moulds, including blow moulds, pre- form injection moulds and cap com- pression and injection moulds. Blow moulds are supplied to companies like Sidel, Krones, KHS, Tech-Long, Newamstar. The maximum size of the PET bottle has 5 l. The bottle design is optimised for light weight production, also with an optimised base for CSDs. z moulds 96 cavity z-slides