Two-component micro injection molding in reproducible precision

Plastic parts with small dimensions and details within the µm range make high demands on downstream processes. In general, micro assembling (i.e. the creation of element groups from single micro parts) has limitations because gripping and positioning is not always possible without damaging micro contours or micro structures. Difficulties in downstream assembling can be avoided by two-component (2C) injection molding. An additional advantage is the possibility to integrate different plastic materials that fulfil different functions within one part.

The Kunststoff-Zentrum in Leipzig (Institute of Polymer Processing in Leipzig, KuZ) has developed the modular micro injection molding machine formicaPlast. A special version of this machine allows 2C micro injection molding. To achieve this technical solution, a transfer unit based on a rotating cross element was integrated. By using it, the mold inserts, containing the “half-molded” 2C part, change their sides to achieve a cavity change. Unique small 2C parts are already made. Total shot weights down to 20 mg were achieved (i.e. the sum of the weights of the two gates and the two parts).

KuZ supports manufacturers by implementing micro injection molding technology. As service, prototypes and small series are manufactured, mold trials are carried out and micro parts and molds are designed. The company KLÖCKNER DESMA in Achim, Germany, manufactures, distributes and services the 2C-formicaPlast.

Kunststoff-Zentrum in Leipzig gGmbH
Konstanze Jonas
info@kuz-leipzig.de
www.kuz-leipzig.de