PASCHING, AUSTRIA (Aug. 19, 1:30 p.m. ET) — Wood plastic compound (WPC) profile producer Extruwood GmbH has developed a new PVC based WPC profile. The profile is designed to substitute aluminum weather-cap profiles on wood profile framed windows, especially on vulnerable wooden sub-frames.
As well as from protecting the wood underneath, the Extruwood-Cap profile also provides better insulation than conventional aluminum capped wooden frames, says Pasching-based Extruwood. This enables wooden window producers to design more slender frames and/or to reduce glass glazing thickness.
Sven Wolf, Extruwood owner and managing partner, says conventional aluminum-capped frames have an aluminum cap that is stretched well into the thickness of the frame. This results in thermal hot or cold spots, he says. This is often offset by increasing the thickness of the wood frame or incorporating foam insulation.
Extruwood makes its Extruwood-Cap profile in a direct extrusion process without using WPC compound granulate. The line used is based on conical co-rotating twin-screw extruders and includes integrated online drying of the natural wood fibers.
The company uses standard extrusion downline pulling and cutting equipment and the line has typical wood processing features such as milling of water drainage channels.
The profiles are available in colored WPC and can be supplied in powder-coated form, or come painted or laminated.
Wolf says the Extruwood-Cap solution is cost effective and that it should appeal to conservative window buyers but still reduces CO2 emissions. It is likely to be used in window renovation and refurbishment applications, he adds.
The weather-cap application won a Solvay Innovation award in October and Wolf will present it in a paper next month at the International Wood Fibre Polymer Composites Symposium in Biarritz, France.