The failed recipe.
Some products from past decades carry have been through many negative stages before they evlove. Wooden windows are no exception, with special highlights in mechanisms, joints and, above all, paints. Dyes as well as painting methods have mostly failed to achieve their purpose. Therefore, in many cases, otherwise good constructions are downgraded thanks to their less-than-perfect paint jobs.
Regarding aluminum, the lack of a painted finish in the 70s and the 80s had led to the corrosion of the frame. In the 90s, electrostatic paints improved durability and looks of the windows. However, it still took many years to perfect the raw materials and dyers' equipment. Today, most paints are reliable but there is space for improvement, espeially, close to the sea, because of electrolysis phenomena in the window joints.
Regarding wooden windows, the problem was mainly in the detachment of the paint from the wood, either partially (chapping) or fully (flaking) which inevitably leads to corrosion and decay.
Suggested solutions had coped initially with the chemical composition of the paints, mainly by abolishing polyurethane, and using water as a solvent. Later, dyers' equipment evolved from simple paint pistols to paint-showers and paint cabins.
There are two new methods for applying paint products (varnishes) to wooden windows: robotic spraying and electrostatic painting. Both can produce equally excellent results, even in extreme environments.
The requirements in both cases are:
- Good penetration of the wood by the dyes. Excellent coverage of every surface of the wood.
- Minimization of waste and byproducts, both for savings and ecological concerns.
The aforementioned methods fully achieve these goals.
In the spraying method, the painting velocity is achieved via paint nozzles and high pressure, in conjunction with humidity and temperature levels which are fully controlled within the paint cabin.
It's worth mentioning that paint surfaces (the wooden profiles) with their edges and details are initially mapped by photo-recognition and then sprayed on, in set intervals and with absolute precision.
The main difference in the electrostatic paint method is the fact that the velocity (with which the paint particles hit the surface) is achieved by electrically charging the varnish (dyes) with high voltage. The strong electromagnetic field created by the voltage between the paint particles and the surface does the rest.
For all of the above reasons, every factory which respects their end product, today invests in the upgrade of their paint shops, using one of these methods. The first decision to be made is which paint vendor to choose.
For example, Danemark's GORI, apart from the raw materials, also procures the painting machinery, standardises the paint environment and certifies the procedures for the end results. The above research has been conducted with Meranti woods.
GORI TECHNOS also manufactures the necessary wood care products, shampoos and lotions.