| Processes | |
• Mechanical blasting ........................................................................... One of the key factors of an adequate conservation system is surface pre-treatment. Compared with chemical or physical pre-treatment, blasting, in all of its different forms, is an ecologically sound treatment. To that end, MetaCoat has a blasting machine. This machine can blast just about anything that can be blasted by hand. Steel products are blasted using a mixture of steel blasting agent, composed by MetaCoat themselves. The blasting agent is continuously cleaned by means of drum cleaners and the dust exhaustion guarantees safe and sound operation in accordance with the directives. Depending on the type of material, the thickness of the material and the degree of presence of corrosion products, the adjustment of the turbines and throughput speed allows for the removal of the mill skin, the annealing skin and other types of pollution, resulting in a clean surface. • Chemical pre-treatment ........................................................................... The quality of the powder coat system (life, corrosion resistance and scratch resistance) is determined to a small extent by the type of powder and the coat thickness. The key factor in obtaining a powder coat system of good quality is the type of pre-treatment. Before the products are coated at MetaCoat, they always undergo successive pre-treatments. These are incorporated into the line and are carried out automatically by a spraying process in a unique room system. Depending on the type of material, we can choose from 12 processes which are carried out in a combined fashion according to a preset process and which, moreover, are recorded on our ‘traceability’ system. • Powder coating ........................................................................... A powder coat of organic material stemming from a powder-air mixture is applied to the pre-treated substrate. During powder coating, the powder particles are electrostatically charged and, therefore, do not require any solvents or thinners, unlike wet varnish applications. After a sufficient amount of powder has been added to the product, it is put into a muffle furnace to allow it to cure at an object temperature of 180 degrees. A single-coat system yields an average coat thickness of 80 micrometers. The best-known thermosetting powders are: epoxy powders, polyester powders and polyurethane powders, each with their own particular field of application. There are also non-pigmented powder coats such as paint varnishes. For applications in heavy corrosion areas such as coastal regions and industrial surroundings or for visually demanding situations, we routinely apply a two-coat system consisting of an epoxy base coat and a polyester top coat. • Duplex powder coating on galvanized steel ........................................................................... Applying a powder coat to a galvanized substrate is referred to as a duplex system. This provides the best protection against corrosion. The zinc coating After the products have been released by the Quality Controller, they are packaged. The packaging material provides sufficient protection during normal road transport. If desired, objects can be packaged very carefully. In such cases, shrink film is used to make sure the products cannot shift in relation Though we handle big sizes, there is a limit to everything. We can process products measuring up to 7m in length, 2m in height and 1m in width. Our coating line is capable of handling a maximum weight of 550 kilos. |
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