It is important to prepare the wood of window frames and sashes well for coating. On the one hand it is about the visual appearance of the window. A smooth surface also improves the weather resistance of the finished surface.
Sanding the individual parts before gluing
Machine sanding of the profiled longitudinal sides of the window components is only possible before gluing. For this purpose, a profile sanding machine is used, which is specially designed for this purpose. If the longitudinal profiling is done in particularly good quality, mechanical profile sanding can also be omitted. This requires the use of high-quality machines and tools with good sharpness.
Sanding of window sashes and frames after gluing
At the latest after gluing, the wood surface must be prepared for lacquering: Any planing marks must be removed. In addition, any glue that has escaped at the corner joints must be removed. After gluing, however, only the flat facing sides can be machine-sanded - sanding the profiles is then no longer possible.
A wide-belt sanding machine is used for sanding the facing surfaces (inside and outside) of standard windows and small window combinations. A brush sanding machine serves the same purpose, but also covers deeper lying areas of the surface. Hybrid concepts with brush and sanding belts are also offered. The size of the windows that can be processed in this way is limited by the working width of the machine.
For larger windows and window combinations, all that remains is sanding by hand with an orbital sander.
Profile sanding machine
Often the profile of the long sides of all window components is sanded before gluing. All individual parts pass the profile sanding machine in longitudinal direction. Through a combination of sanding belts, lamella rollers and discs, the parts are sanded from all four longitudinal sides ready for lacquering. Top models detect the width and profile of the parts without contact and adjust themselves automatically accordingly.
Wide belt sanding machine
Wide belt sanding machines guarantee a very good surface quality and are efficient. Models with different numbers of belts are available. They can only sand the flat facing surfaces; the maximum possible width is limited.
Brush sanding machine
The material is removed here by several brushes moved along and across the window frame or window sash. A motor-driven height adjustment as well as speed control of the individual aggregates enables a flexible adaptation to different part geometries.
Orbital sander
Orbital sanders differ mainly in the removal rate, weight, service life and the quality of the dust extraction.
