Micro manufacturing: hot runner system with miniature nozzles When it has to be very narrow The smaller the cavity spacing the more delicate is the final product: With a very small nozzle distance of just 4,5 mm the new hot runner system from Heitec allows a closer spacing of each medical vial strip. cooling is much more effective. This has a positive effect on the gate vestige height of the article and the cooling time. For the development of miniature nozzles, a test tool with a 10-drop hot runner system was built for molding of toothpicks in order to perform durability and material tests beliebigen Stelle im Dokument A test tool with a 10-drop hot positionieren. Verwenden Sie die runner system for molding toothpicks 'Textfeldtools', Registerkartehelped during the development of the wenn Sie das Formatminiature des nozzles. Pictures: Heitec Textfelds 'Textzitat' ändern möchten.] under production conditions. In producing these toothpicks made of PMMA, which are connected together in bundles of five over a thin film gate, it shows no visually detectable degradation of the plastic after a production interruption of more than 30 In response to the demands for ever more The gating is still on each vial with a minutes. This illustrates the uniform compact hot runner systems for the separately controllable nozzle. This can temperature profile of the hot runner production of plastic components used in allow one to actively influence the filling system. With a gate diameter of 0.8 mm all the medical and electronics industry Heitec behavior, if necessary. A uniform filling of articles filled completely right after re- Hot Runner Systems introduces a new hot the articles from the bottom of the vial up to starting the mold with the first shot again. runner system. Until 2011 a 6.0 mm cavity the support strip can be achieved. The very There was no evidence of stringing or drool spacing was considered to be the smallest small nozzles, and the use of good heat- possible using individually controllable hot insulating materials for the sealing Due to the small dimensions of this system tip nozzles. Continuous development of the elements result in a 45W/h energy it is suitable for shot weights per nozzle of Flat-Line nozzle series now allow a consumption per nozzle processing PMMA. distance from 4.5 mm. This sets new The small dimensions of the entire hot analytical and medical technology it is used standards for space utilization and runner system also reduce the radiation of in standard micro injection molding maximum number of cavities per mold. This heat to the mold so that the mold applications, but also in reel-to-reel system is especially useful for the manufacturing and metal overmold production of the smallest medical vial applications for micro switch or IC's in the strips using PP or PMMA for analytics, or electronics industry. smallest TPE seals for infusion technology. The new hot runner system now allows a closer spacing of each vial. Bastian Schreck, HEITEC Heisskanaltechnik Burgwald Juni 2013