Multi-component injection moulding
of Liquid Silicone Rubber/thermoplastic-combinations
Institut für Kunststoffverarbeitung (IKV), Pontstraße 49,
D-52062 Aachen, Germany
The two-component
injection moulding method allows the production of parts consisting of two
components which are arranged next to or above each other (overmoulding).
Besides well known combinations between thermoplastics and thermoplastic
elastomers (TPE) which are used in various applications, the combination of
Liquid-Silicone-Rubbers (LSR) and thermoplastics becomes more important because
of their better mechanical and thermomechanical properties as well as the
chemical resistance in comparison with TPE. These combinations of LSR and
Polyamid can be a new alternative for combinations made of rubber and metal,
which often require a costly preparatory treatment. Concerning the adhesive
strength of these combinations, which depends on the properties of the
materials, the process parameters in the moulding process and the mould
technique, there is only insufficient knowledge. To solve this, the IKV
developed techniques to meet the requirements. Results of the investigations in
this context will be presented.