Good ventilation is essential to have good drying and curing conditions.

Good practice

Bad practice

Salts and contaminants

Salts, oil, grease, dust, abrasive and other contaminants that can precipitate on the surface to be painted must be avoided. Contaminants can come with the atmosphere (marine and industrial) or by other work / trades carried out close by. To prevent contamination of the surface the surfaces to be painted must be sealed off. Any existing salt must be washed away with fresh water and other contaminants such as oil and grease, with a suitable detergent.

· Salt may cause osmotic blistering

· Oil and grease will give reduced adhesion between the substrate and the paint

Safety aspects during application

Because airless spray systems operate at high pressure you need to give special attention to safety during operation. Two safety considerations are paramount:

· Fluid sprayed from the gun is propelled with sufficient force to penetrate a mans skin and cause very serious damage.

· The entire system is pressurised so that hose ruptures or leaks at fittings can result in dangerous high pressure spray.

Some important safety practices should always be born in mind:

· Never point the gun at any part of your own body or at another person.

· Do not make adjustments to the equipment set-up, such as changing nozzles or fittings without first shutting off the pump, releasing the system pressure and securing the gun.

· Do not remove the tipguard during operation. The tipguard is there so that you cannot put your finger close to the tip and inject paint under your skin.

· Always engage the trigger lock when the gun is not being used.

· Always make sure the fluid hose is in good condition before spraying.

· Do not use standard hardware on an airless system; only high pressure fittings.

· High pressure hose is required for fluid flow. The hose must never be bent or kicked.

· Airless spray equipment must be grounded to prevent static sparking.

· Do not spray solvent through the nozzle tip because this can build up static electricity and cause explosion or fire.

Figure 7.7.

Ailess spraying can be dangerous

Дата добавления: 2015-10-26