LFI- PU is a highly automated process for the production of fibre enforced PU composites. Despite the traditional SRIM process various fibre materials and the PU components are fed in the mixing head in an one step process.
The PU-fibre-mix is poured in an open mould which is closed after pouring. It is possible to have a finished surface by inserting preformed textiles and cover foils in the mould. The process allows the production of door panels, package trays and load floors / covers for a wide variety of applications.
The LFI-process enables the manufacturer to produce parts in two different technologies:
» The standard process for parts with thin walled profiles like instrument or door panels and
» a process for low density composites in honeycomb technology for package trays and load floors.
The cavities are filled with a robot mounted system which enables the manufacturer to vary the fibre content and amount of raw material while pouring. Fibre contents with a ratio between 10 and 50 % of the total mixing head output are possible. The fibre processing unit also allows the variation of the average fibre length between 12,5 and 100 mm. Changes to the fibre processing unit allow the usage of natural, carbon, aramid and other fibres. At the moment the usage of glass fibres is dominating the applications. The mixing head is able to process compact and cellular polyurethane systems.
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