DuPont? Vespel? parts for pusher fingers

Emhart Glass of Cham/Switzerland, one of the world’s leading manufacturers of high-performance machines for the production of glass containers, now uses Vespel® SCP-5050 parts for thermal insulation, replacing the standard carbon graphite components used in the liners for pusher fingers. This change helped to further reduce maintenance costs for users and, at the same time, minimize reject rates of the produced containers. The pusher fingers are used to move up to four molded glass containers - that are correspondingly soft and have temperatures up to 600 °C – from the dead plate to the conveyor belt in less than a second. The bar-shaped liners, which are inserted within the pusher fingers, transfer the high acceleration forces involved in this process to the glass surface.When compared with Vespel® SCP-5050, standard glass grade carbon graphite bears a couple of drawbacks in this particular application that can lead to higher production costs. Due to its high heat transfer coefficient, a lot of heat is transferred from the glass to the liner at the point of direct contact. This can lead to localized cooling and the build-up of high stress concentrations in the glass container, resulting in checks (micro-cracks) in the glass and its eventual rejection. The heat transfer coefficient of Vespel® SCP-5050 parts is approximately 50 to 100 times lower than that of conventional carbon graphite components. Stress concentrations are consequently lower, meaning production rates can be increased for greater plant productivity and energy consumption per unit is reduced. Carbon graphite also absorbs oil during operation, leading to a further increase in thermal conductivity. In contrast, Vespel® SCP-5050 parts absorb almost no oil, meaning that the liners retain their low thermal conductivity for longer. In addition, the impact resistance of the Vespel® SCP-5050 parts is approximately twice as high as that of the carbon graphite components. Thus they can withstand higher mechanical loads, meaning fewer maintenance downtimes caused by broken liners.Moreover, because the wear resistance of Vespel® SCP-5050 parts exceeds that of their carbon graphite counterparts, they are particularly durable with regard to the intensive and abrasive operational demands placed on them by the extremely hard glass surfaces. Vespel® SCP-5050 parts used as thermal insulators in pusher fingers reduce checking and last longer than standard carbon graphite counterparts. Photo: DuPont PP-EU-2011-30Christian Fr?ba, Director After Sales at Emhart Glass, reports: “Whereas the graphite liners usually need to be replaced any time between 6 and 12 months, we expect the liners with Vespel® SCP-5050 parts to have up to three times longer service life, based on testing. Considering that an average machine to date is fitted with between 8 and 12 pushers, and that each of these is equipped with between 8 and 16 liners, this can mean a considerable reduction in maintenance time and costs.”Fr?ba continues: “Based on the convincing results of tests conducted by our company, we now use Vespel® SCP-5050 parts as a replacement for carbon graphite for the pusher finger liners in all of our machines. This includes the standard SIS lines, the IS and AIS series machines for medium requirements as well as the new, servo-electric powered NIS high-performance machines, which are designed for production rates of 700 or more glass containers per minute. All machines installed for customers to date have met our high expectations with regard to increased productivity through fewer rejects and reduced maintenance costs.”Vespel® SCP-5050 parts and shapes combine very low friction with very high wear resistance at high temperatures. As an alternative to carbon graphite wear parts, this technology offers both quick and convenient global availability as well as flexibility in sizing, charge-to-charge consistency, certified quality, rapid prototype development and the cost-efficient production of customer-specific parts – a service used by Emhart Glass for the liners of its pusher fingers..DuPont Performance Polymers is committed to working with customers throughout the world to develop new products, components and systems that help reduce dependence on fossil fuels and protect people and the environment. With more than 40 manufacturing, development and research centers throughout the world, DuPont Performance Polymers uses the industry’s broadest portfolio of plastics, elastomers, renewably sourced polymers, filaments and high-performance parts and shapes to deliver cost-effective solutions to customers in aerospace, automotive, consumer, electrical, electronic, industrial, sporting goods and other diversified industries.DuPont (NYSE: DD) has been bringing world-class science and engineering to the global marketplace in the form of innovative products, materials, and services since 1802. The company believes that by collaborating with customers, governments, NGOs, and thought leaders we can help find solutions to such global challenges as providing enough healthy food for people everywhere, decreasing dependence on fossil fuels, and protecting life and the environment. For additional information about DuPont and its commitment to inclusive innovation, please visit www.dupont.com. *** The DuPont Oval Logo, DuPont™, The miracles of science™ and all product names denoted with a ® are registered trademarks or trademarks of E.I. du Pont de Nemours and Company or its affiliates. 19.04.2012, DuPont?