Grâce à un procédé de polymérisation UV à ondes courtes dans un environnement sans oxygène, la technologie opacifiante aux excimères produit des surfaces hautement performantes.
Exydry-Z utilise la technologie aux excimères pour obtenir une surface résistante à effet soft-touch, qui évite les traces liées à des empreintes de doigts et offre une opacité élevée, même sur les panneaux profilés, mais aussi sur les bords des vantaux.
UV-R est un four de séchage par rayonnement UV regroupant en un seul module tous les éléments du process : transport, lampes UV et armoire électrique.
There are different types of oven: in-line, vertical and UV. The first two will dry items through a physical process and differ by size, working speed and hold times of the workpieces. UV ovens, on the other hand, are based on a chemical process and their size is smaller. The choice of an oven is determined by the type of lacquer used.
The recommended type of drying depends on the type of product and is normally defined in agreement with the lacquer manufacturer, to ensure the required coating performance over time. The coating cycle, which also includes drying, is then defined with the aim of obtaining the desired final result, reducing the required investment and optimising performance.
Excimer drying is a drying process for UV coating products, which allows surfaces to be obtained with truly outstanding deep matt finish and resistance characteristics of the coating film. Normally it is a mixed cycle, which includes the evaporation of the solvents, followed by exposure to a dedicated lamp (an excimer lamp), to end with final UV crosslinking, necessary to definitively "lock in" the obtained result. The oven Exydry-Z ensures a deep matt finish, surface resistance and soft touch effect even on shaped or raised panels.
Drying in an inert atmosphere is obtained by dramatically reducing the amount of oxygen present in the oven and replacing it with an inert gas, nitrogen. Considering that oxygen is the natural barrier preventing the crosslinking process, this type of drying allows a 40-70% reduction in the quantity of photoinitiator needed to start crosslinking of UV coatings, resulting in significant cost savings. The first inert atmosphere oven on the market is UV-I.
In addition to the dramatic reduction in photoinitiator requirements, with the resulting lower cost of lacquers, drying in an inert atmosphere ensures other advantages. The lacquer used is less harmful to the environment. The yellowing effect caused by photoinitiators is less likely. Fewer UV lamps are required to activate crosslinking, resulting in lower energy costs.
Normally drying ovens are rather simple machines, only a few parameters need adjustments and most importantly, these parameters remain stable even when the lacquer colours and/or the shapes of the coated pieces change. No particular skills are therefore required; it is necessary, however, to set the temperatures for the different zones (if any), the air speed and possibly the power of the lamps (if any).
Ovens, just like the coating application machines, have specific characteristics. This makes some ovens specifically suitable for some processes, while others are more flexible and able to adapt to different types of application. For example, a vertical oven is specifically intended for raised or shaped doors, but it can also be used for flat ones.
Each oven is created with a specific objective in mind. Within the scope of these specifications, it is obviously possible to adjust some parameters including temperature, air speed, power of the lamps and lamp distance. The machines are therefore inherently flexible when operating within their design scope.
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