Coating Terms

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Description
Application of coating to the surface by pouring the coating by means of a hose etc. Coating is then collected in a bottom container to be pumped back to flow coating process.
Type of accelerated test to determine the performance of organic coatings in preventing the corrosion of the metal surface they are applied to. Different from the standard Salt Spray Test, the aqueous solution sprayed on the coated panel includes 0,025% copper chloride dihydrate, in addition to the 5% sodium chloride.
Bells rotating at a speed of 25,000-60,000 rpm are used for spray applications, which are especially utilised in otomotive OEM coatings. Paint is broken into tiny droplets as a result of the centrifugal force arising from high rotation speed and sprayed on the application surface. Electrostatic methods are used for these kind of applications due to transfer effectiveness.
Coating application performed by dipping the object into a vessel or tank filled with wet paint at application viscosity. Possible coating defects such as sagging; settling, foaming and non-homogeneous film thickness can be avoided by complete control over application variables.
Test performed by pushing a knob with a constant speed against the back side of a coated panel causing deformation. During the test, also called Erichsen deformation test, knob is stopped when the first sign of crack formation is observed, deformation depth is measured in mm and this value is defined as deep cupping resistance.
Type of roller applications, which are based on coating flat panels with rollers on a moving conveyer. In direct roller applications, rotation direction of “application roll” is the same as the conveyer’s moving direction. Having a lower shear than reverse roller application, direct roller application provides good results in primer and non-glossy top coat applications. See Also Reverse roller application, Roller coating applications
Part of a ship between submerge levels of empty and fully loaded conditions. Surfaces at boot topping part are exposed to frictional effects by guide boats, piers and buoys. In addition, depending on the loading level, it can be exposed to spattering of sea water or can be fully submerged.
Applications based on breaking and spraying the liquid paint in tiny droplets to surfaces with the help of pressurized air. Spray applications performed by air spray guns using pressurized air at 2,5-5,5 atm. are widely used especially for industrial coating applications. In air spray applications, paint is sprayed in droplets of 20-50 micron diameter.
Spraying of paint through a thin nozzle at 5-35 atm pressure. In airless spray applications, the paint can be sprayed as droplets of 70-150 micrometer diameter by means of an airless spray gun. The bouncing effect and related paint loss is less compared to air spraying applications.
Application of paints and varnishes by spraying in tiny droplets using air guns with air at 2,5-5,5 atm pressure. Feeding of coating to the gun is achieved either by gravitational forces from a cup placed on top of the gun, or by suction from a cup placed under the gun or by pressurizing the paint.
Electrostatic coating method used to coat a positively charged surface with little loss, using powder coating particles charged by air molecules ionized under high voltage.
General name of thermoplastic polymers synthesized by polymerization of propylene. In paint industry, polypropylene is encountered as a substrate material since its impact resistance is high. On the other hand, low surface tension of propylene (30,1 mN/m) makes the substrate difficult for wetting and adhesion of paint.
Mixture of polypropylene with rubber which is also a polymerization product of ethylene, propylene and diene monomers. See Also Ethylene propylenediene
Paint application performed by using three parallel rollers named as pick-up, feeding and applicator. Pick-up roller immersed in paint pan, moves around its axis and transfers the paint to the feeding roller which it is in touch with. Feeding roller transfers the paint to the applicator roller in contact with it. Application roller, transfers the coating onto the material to be coated which is moving on a conveyor belt. See Also Direct roller application, Reverse roller application
Paints that can provide protection for a certain time to the surface on which they applied and after this period, they can be easily removed from the surface.
Paint application method where the applicator rolls run in the opposite direction to the conveyor movement. In this application, better levelling is achieved on the surface because sheer stress exerted on the paint film is higher than in direct rolling application. Reverse roller application method is preferred especially in glossy topcoats. See Also Roller coating applications, Direct roller application
Through these applications, powder coating fluidized by mixing with air is sprayed using a powder gun with an orifice. A high voltage of 40-100 kV connected to a negative electrode at the orifice ionizes air molecules. This cloud of ions is called “corona”. Powder particles pick-up anions when passing through the corona and become negatively charged. Since the object to be coated has become anode because of grounding it attracts particles to its surface. Particles are neutralized when they reach the surface. Loose powder coating film, turns to a tough, durable, continuous, film with good adhesion after baking.
Name of the roller which transfers the paint to the sheet to be coated on the conveyor belt. If the application roller runs in the same direction (at different speed) with the conveyor line, the process is called direct roller application, if roller runs in the opposite direction it is called reverse roller application. See Also Direct roller application, Reverse roller application
The most suitable viscosity at which paint can be applied by the chosen method with ease.