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Hopmann C.,RWTH Aachen | Hopmann C.,Institute of Plastics Processing IKV | Theunissen M.,Fluid Injection Technology Working Group
Kunststoffe International | Year: 2013

The PIT offers the possibility of saving significant amounts of material compared with the conventional fluid injection technology. With this process, the cycle time is also shortened due to the lower residual wall thicknesses. The additional design freedom in the production of non-circular cross-sections opens up new avenues for establishing new applications in the form of design parts on the market. Results from the latest research suggest that the W-PIT, in particular, produces outstanding inner surface finishes and also allows materials to be processed going beyond the possibilities of the conventional water injection technology.

Michaeli W.,RWTH Aachen | Michaeli W.,Institute of Plastics Processing IKV | Neuss A.,Multi Component Technology Working Group | Grundler M.,Multi Component Technology Working Group | Wunderle J.,Multi Component Technology Working Group
Kunststoffe International | Year: 2010

A new hybrid injection molding process developed at the RWTH Aachen University enables the production of complex plastic parts with integrated metallic conductors for electronics applications in short process chains. The hybrid technology combines the benefits of the two materials, metal and plastic, in one component. The object serves a pair of sports eyeglasses whose lenses can be heated by a conductor and hence kept fog-free. In this way, the flowing current can be made indirectly visible through the heat being given off. Based on the multi-component injection molding process, the mold technology is designed such that the component can be produced in a compact manufacturing cell. In order to tailor the machine and mold engineering to the hybrid multi-component process, an injection molding machine is expanded to include a unit for the processing of the metal alloy with its low melting temperature.

Lammert N.,RWTH Aachen | Lammert N.,Institute of Plastics Processing IKV | Nikoleizig P.,RWTH Aachen
Kunststoffe International | Year: 2014

The above-described high-performance molds and the resulting trends illustrate the position of the mold manufacturer as a central component of injection mold manufacturing. In a changing economic environment, the industry must resolve the conflict described above between small and large-series production of plastic parts. Despite the excellent technical level that has long been achieved, mold manufacturers still manage, through a large bandwidth of solution approaches, to grow and respond to changing demand situations. Though high-performance molds are characterized by different technical properties, they still have one feature in common: they optimally meet the customer's demands. At many points, it is found that efficient injection molding production can only be ensured through the interplay of the players involved and, first and foremost, of all the required technical fields, such as plastic and steel processing, automation, control, etc. This will be promoted by further innovations and will characterize the injection mold production of the future. © Carl Hanser Verlag, Munich.

Hopmann C.,Institute of Plastics Processing IKV | Becker S.,Institute of Plastics Processing IKV
Kunststoffe International | Year: 2012

To sum up, online ultrasonic analysis of gas and water-assisted injection molding permits assessment of the process as well as registration of the residual wall thickness. It can reduce costs for downstream offline testing processes. If malfunctions occur, ultrasonic analysis permits a rapid intervention in the process.As a result, reject rates in production can be clearly reduced. With increasing demands for documentation of the manufacturing process, ultrasonic measurement permits 100 % control of all parts more cost effectively than with other offline measurement methods. © 2012 Carl Hanser Verlag, Munich, Germany.

Michaeli W.,Institute of Plastics Processing IKV | Michaelis I.,Institute of Plastics Processing IKV | Gries T.,RWTH Aachen | Deichmann T.,RWTH Aachen | And 2 more authors.
Kunststoffe International | Year: 2010

A partially resorbable polymer composite textile, made by compression molding is being developed for small intestine replacement in people suffering from short bowel syndrome. The composite structure will consist of a non-resorbable textile fabric coated with a biodegradable polymer. The job of the knitted textile structure will be to permanently withstand the mechanical stresses induced by peristalsis. It will also provide permanent support for small intestine neoplasms. To prevent leakage of intestinal fluid and escape of bacteria from the digestive tract into the surrounding tissues, the implant will have to be leakproof initially. Once the small bowel tissue re-forms, it will take on the task of sealing the textile and the polymer will no longer have to provide this function. The pores will have to be uniformly distributed across the textile specimen. It is possible, however, that strong flow processes on the part of the molten plastic will adversely affect the distribution.

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