Koebelin develops micro PEEK moulder

German mouldmaker and processor Koebelin Formenbau has developed a special injection moulding system to produce surgical instrument connector plugs in high temperature PEEK resin using a 2.8g shot weight.

The company is using a MTT Micro Moulder 12/90 miniature injection moulding machine for the project, equipped with its own-developed metering block. The nine tonne clamping force machine, built by MTT in the UK and marketed in Germany by Hewaco, has been developed specially for processing thermoplastic parts with shot weights between 0.02 g and 12g.plastic mould manufacturer in China
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Koebelin developed the metering block because the small size of the tool used - 100mm by 120mm - did not provide sufficient space for installation of a hot runner nozzle. Both tool and metering block were designed and made by Koebelin; the hot runner nozzle was supplied by Gunther.

The high processing temperatures of PEEK - melt temperatures can be as high as 400¡C and mould temperatures up to 200¡C - meant that special thermal considerations also had to be taken.

Kobbelin has designed the mould to provide minimal contact area against the machine platen and has also incorporated additional temperature control elements. It claims that thermal losses are very low, making the moulding process highly energy efficient.