KraussMaffei to show CFRP roof of sports car at K 2013

Improved fiber wetting thanks to C-RTM

The polyurethane for both for the supporting part and its surface is poured in when the mold is slightly open (compression RTM). This produces only a very low flow resistance, which allows injection of the polyurethane system with high pour rates.

Then the mold is closed and the part is shaped. The process not only improves fiber wetting but also prevents fibers from moving around as much – even with low pressure inside the mold. The process is made more reliable through the use of an MK-5/8-2K self-cleaning high-pressure mixing head. Using patented variable nozzles allows the pour rate to be changed without changing the pressure or affecting the mixing quality – even during the shot.

The two mixing heads are also fitted with a vacuuming and blowing unit. Mold technology is provided by a heated and high-gloss polished RTM mold, which boats a special seal system. The means that the PU can be injected with vacuum assistance even when the mold is slightly open. The machine can, however, still be used for classic closed-mold injection.

A specific ventilation system ensures that paint is evenly distributed throughout the mold. Sophisticated integrated sensors monitor and regulate the optimal filling of the mold and provide immediate feedback about the quality of the part. An ejector system assists take-out automation and allows finished parts to be demolded by automated robots.

Strong network of partners at the trade show

In addition to the two aforementioned partners who supply PU systems, there are several other companies in KraussMaffei's network of expertise. Dieffenbacher, Zoltek, Chomarat, Alpex, Mühlmeier and Roding Automotive are part of the entire trade-show project and involved in its execution. The end result is a mature production chain extending from the fibers and matrix materials through to the finished component.

KraussMaffei