Abstract: The invention relates to a method for producing a wiper arm for window wiping systems in vehicles. According to the invention, an articulated part of a wiper arm is stamped out of a one-sided sheet metal material which is pre-coated on one side, and is then bent in a mold having a U-shaped cross-section. In this way, the coated surface forms the inner side of the articulated part of the wiper arm. Said articulated part is then joined to a wiper arm fixing part by means of a hinge bolt, and the wiper arm is then provided with a layer of paint by means of a spraying or powder technique.

Abstract: A method and apparatus of ventilating a treatment cubicle such as a painting or spraying cubicle used for painting items such as vehicle bodies. Wherein fresh air to be supplied to the cubicle is supplied via an air-permeable ceiling (1); and air supply chamber (2) is provided above the ceiling (1) and communicates with an inlet air chamber (3) which is connected via at least one aperture (4) to a fresh air supply system. The volume of fresh air flowing into the air supply chamber (2) can be regulated by altering the aperture (4). The proposed process is characterized by the fact that at least some of the fresh air drawn into the inlet air chamber (3) is forced to flow in a path parallel to the ceiling (1) for a predetermined distance before passing via the aperture (4) into the air supply chamber (2), while the parameters needed to regulate the fresh air flow are measured in the end region of the directed air stream.

Abstract: In a process for drying coated surfaces in a hot-air dryer, part of the hot air in the dryer is continuously circulated therein as a secondary air stream which is mixed with a primary air stream heated to above the drying temperature (T.sub.max). This reduces the quantity of hot air to be fed into the dryer and thus the material requirements are reduced and the heating time shortened. A hot-dryer for implementing the process has, in the hot-air chambers (7,8) arranged symmetrically on either side in the interior (6) of the dryer, a separating wall (22) dividing an internal chamber (7) and an outer chamber (8) which has fun intake aperture (9) at its lower end for secondary air. At the lower end of the inner chamber (7), the primary air is fed in at a higher flow rate and mixed with the secondary air taken in through the aperture (9).