MOULD MAKING PETplanet Insider Vol. 22 No. 12/21 www.petpla.net 21 moulds that include all the quality and features of the company’s top-entry injection moulds. The stack structure is also executed with Cavity-Lock, and the latest performance-enhancing innovations such as OH XCool and OH Xblow can also be integrated into the mould. In addition, all corresponding EOATs are available to match the selected preform. The hot runners comply with all relevant standards. In operation For initial tests, a side-entry mould from OHAG was installed in a new PET-Line 4000 at Netstal. The 96-cavity mould (for technical data see box on the right) was designed for a preform with a 38mm 2-start thread, a weight of 50 grams and a wall thickness of 4mm. The EOAT cooling ran over four positions, the air cooling over three. With a cycle time of 13.9 seconds and an injection rate of 22.5 grams per second and cavity, the new side removal mould exceeded expectations during the first tests, according to the company. Well-known PET preform manufacturers in the USA, who are already using the new side removal moulds on a daily basis, were able to confirm the high performance in the tests and attest that the side removal moulds are of the same quality as the systems with top removal. Along with the engineering and construction of preform moulds, Otto Hofstetter AG offers a comprehensive range of services for all aspects of PET preform production. Projects generally start with the clarification of the customer’s needs and end with the testing of the first preforms produced on the production system. The Swiss company believes a successful project is best achieved by early and close collaboration with all involved parties, up- and downstream. www.otto-hofstetter.swiss Tests - technical data Mould cavities: 96 pitch: 60 x 140mm Preform neck: 38mm 2-start thread weight: 50 g wall thickness: 4.0mm Material : PET-IV 0.80 dl/g Post mould cooling EOAT-cool: 4 positions Air cooling: 3 positions Performance cycle time: 13.9 s injection: 22.5 g/s/cavity
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