Tuesday, August 20, 2024
The Prüm door factory in Weinsheim (Eifel) has introduced an automated finishing line for the first time, seamlessly integrating the previously separate roller and spray coating processes, along with all pre- and post-treatment steps. This advancement allows the manufacturer to paint its white interior doors at double the speed, while also achieving enhanced quality.
“We make a door white. That sounds simple. But the process is more complex than some people imagine,” says Christof Thielen, Technical Manager at Prüm-Türenwerk GmbH. The company, which is part of the Arbonia Doors Group, specialises in the timeless classic of white doors, among other things. In the course of its multi-year investment process, frame and door production were separated from each other. New machines and systems were largely installed in the door factory. This also included a Venjakob roller and spray coating line, individually designed to meet the special requirements of premium white doors.
High demands on quality and quantity
Previously, two individual systems were in operation. One for roller coating and priming, one for top coating using the spray process. As the capacity in the white paint area had reached its limits, the company invested in a new painting line. Venjakob was ultimately selected as the premium partner for finishing within the Arbonia Group. The many years of excellent cooperation with Venjakob and the individually designed system solutions, which are already in use at sister companies such as Garant, were the decisive factors in Prüm-Türenwerk’s decision to work with the machine manufacturer.
“We wanted to combine both processes automatically in one line. Our requirements were already quite demanding. The different applications, priming and painting, had to be adapted both to the special features of the two exclusive white lacquers and to the quantity to be achieved. The joint project planning process for this took several months,” says Prüm’s Technical Director, Christof Thielen.
Twice as fast as before
In the coating and priming process, three sanding machines are utilized for pre-sanding and intermediate lacquer sanding, along with four roller coating machines for primer application, with a fifth added as a backup. The complete roller coating and spraying process, which includes turning and returning the workpieces for a second pass, involves a total of 14 production steps.
With this system combination, a time saving of 50% is achieved compared to coating on two separate coating systems.” In addition to the development of the combined roller and spray coating system, including drying technology, the entire conveyor and air technology was also supplied by full-service provider Venjakob.
Tricky edge sanding
The rabbet and door are painted and sanded in a continuous process. This also applies to sanding the two longitudinal edges and the top edge. As the edges have different widths, the width of the Venjakob edge sanding machine is adjusted accordingly. A moving, diagonal sanding unit is used to sand the leading edge in throughfeed. A trailing unit with three brushes moves along the upper edge as it passes through, creating an impressive image.
Best features combined in one line
All in all, the Venjakob roll-spraying line described above is a proven masterpiece that combines various features to get the best out of the system. For the Prüm door factory, the combined system is an important part of shortening the entire production process. This is also the manufacturer’s declared aim in times of scarce raw materials and supply bottlenecks.
Read more news on: Venjakob, roller coating, drying technology, sanding, spraying technology
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Tags: drying technology, Edgebanding, Finishing Lines, roller coating, smallest HOMAG sanding machines, spray coating, Venjakob, wood, wood and panel, woodworking, woodworking and manufacturing, woodworking and processing, woodworking event, woodworking industry
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