Munich, Germany – Krauss Maffei will use K 2019 introduce a new machinery system for polyurethane compounds with expandable graphite.
The system features a high-pressure mix head with low pressure bypass. There is also a premixing station to meter the expandable graphite. The premixer has an agitator which mixes the filler with the liquid component. It is possible to produce homogeneous mixtures that are 80% by weight graphite, KM claims.
Krauss Maffei said this combination of low pressure mixing and bypass makes it possible to use the material directly rather than as an admixture. Stress on the graphite is minimised because it recirculates in the low-pressure system. It only circulates through the nozzle to build pressure just before injection.
The company adds that the automated pre-mixing process gives short cycle times and good overall system efficiency. The technology enables up to 30% by weight of expandable graphite to be processed with the machine.