Combined Extrusion, Injection Molding and Reaction Technology
At the K2007, KraussMaffei will the injection molding compounder with reactive processing and multi-component molding for the first time. Fully automatic production of a multi-material part with vibration-absorbing characteristics will be demonstrated. The carrier (substrate) and the sleeve that absorbs force are made of glass fiber-reinforced polyamide (PA66-GF35). The nylon is introduced to the mold by a modular beside-the-press unit.
Following this, the sleeve and carrier are bonded to a vibration-absorbing soft material. The material used for the vibration-absorbing layer is a new type of TPU-X that undergoes cross-linking after molding as the part cools. The injection molding compounder incorporates the liquid cross-linking agent into the melt uniformly, thus ensuring a homogeneous mixing. Next, the plasticized and homogenized material is injected into the mold through a heated line with the aid of an injection cylinder. The combination of compounding and injection molding produces parts with the reproducibility expected from injection molding. The thermoplastic processing of the materials permits the use of modern moldmaking methods and hot-runner technology in order to obtain flash-free parts without attached runners.
The exhibit illustrates the multi-faceted potential of the injection molding compounder. While this machine system has to date been employed in higher-throughput applications, this application shows the possibilities for use with small and medium-sized parts. In addition to introducing fiber reinforcements and allowing reactive processing, the injection molding compounder can be used to add functional additives into the plastics melt.
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