Brief Introduction Of Metal Powder Coatings

As metal powder coating can make a bringt luxurious decorative effect

, that is very suitable for furniture, jewelry, cars and oter indoor, outdoor spray.The main manufactureing process unsed in Chinese market is dry-blending, also use the bonding in international. Friction gun is generally not suitable for metal spraying of powder coatings. In most cases, it is recommended that the use of electrostatic spray gun coated with semi-fitted. Because this type of product containing the metal paint, electrostatic gun construction should be to ensure good grounding of the system, while setting a lower electrostatic voltage and the amount of powder to prevent spray ignition phenomena. Formation of the effect of the coating has a great relationship with the setting, quality or brand of the gun. Long spray may be a lot of accumulation of metal powder in the gun discharge needle need construction regularly clean up the discharge needle.

In most cases, the metal powder coatings error, we do not recommend the use of the gloss measured the luster of the metallic appearance of the coating, but only the visual comparison method to determine whether the standard model.

For the manufacture of powder with a dry mixing method, due to the separation phenomenon occurred in the spray and recovery process, recovery of powder and powder metal pigment content there will be some differences, may lead to inconsistent appearance of the coating, appear color cast phenomenon. This is due to the nature of the differences between the metal pigment and powder particles. China Epoxy Resin Industry Association, experts suggest that the recovery of powder and powder ratio of at least 1:4. If you are using a bonded fixed method of manufacturing the powder coating, relatively fixed ratio between the metal pigment and powder particles can re-use of recycled powder.

Spraying the varnish layer on the metal powder paint coating has the following advantages: enhanced the performance of metal powder coating's anti-stoning; increase the aesthetic effect of the metal powder coating; completely solve the metallic pigment may rub off; improve the metal powder coated The weather resistance of the membrane. To ensure the appearance of the varnish layer requirements by first spraying the workpiece can not be any pollution. Thus, the general need for fully automated spray lines and two separate sets of spray booth coating respectively. Under normal circumstances, do not spray varnish layer is recommended. Only used only when demand is very high, such as: high-end home appliances, car wheels, as well as outdoor use (ensure weather resistance).

Wipe off the metal powder coating, bonding the fixed method of manufacturing metal powder coating, with a dry mixing method or not completely solve the metallic pigment may rub off the problem. The address can rub off the only way to spray a layer of transparent coating on the metal powder coating.

For one product, try to use the same batch matal powder coating, to avoid the coating difference bewteen dirrerent batch. Metal powder coating keep the spray condition stable. Use the same equipment, use the same voltage, pressure, keep the same distance between the spry gun and wordpiece, keep the film thickness stable, ensure the powder coating has fluidization before spraying, when using recycle powder, we should ensure the rate of recyle powder and new powder at least 1:4, and try to avoide the complex shape of metal powder or existence of the deep depression of wordpiece. We suggest that multiple workpiece should spray together.

Source:http://www.mhcmp.com

by: anelwew

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