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Process know-how JETex

Basic development and optimisation of processing and feasibility tests for the JETex process is required during the project. Therefore, the processing tests using fibre structures, inserts and pre-forms were performed. The trials were partially done simultaneously to the stepwise adaptation and modification of the lab equipment like heating, injection unit and the moulds.

The JETex process was first individually tested and optimised. The required processing basis is established for the development and optimisation of the JETex technology and its application.

The processing tests with JETex started with two thermoplastic resins, pre-polymers as basis for polyamide (PA) and polybuthyleneterephtalat (CBT). The process development was done with new constructed enhanced test moulds. Finally the CBT system was chosen and used for development and test.

The trials e.g. with the flat textile reinforced test plate gave knowledge about the behaviour of the thermoplastic impregnation. It showed that the bonding of the injected thermoplastic material to the insert-matrix material was very dependent on mould filling and the relevant process parameters:
- Resin temperature.
- Mould-temperature.
- Order of mould heating and cooling phase.
- Mould filling phase / injection of resin.
- Holding / consolidation time.
- Geometry and position of gating system.
- The type of the matrix material as well as the surface treatment of fibres has a strong influence on the bonding between matrix and textiles.

Reported by

32657 LEMGO
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