Solutions for Pollution Problems

Paint Spraying

Paint Spray Guns

What is HVLP environmentally friendly spray guns?

HVLP is the abbreviation for "High Volume Low Pressure"

HVLP spray guns use high volume of air flow rate at low atomizing air pressure to enhance the paint truns for afficiency. It hayes to reduce the emission of volatile organic vapor and amount of paints used. It helps to reduce pollution due to overspray from traditional spray guns is minimized.

To date, overseas countries, such as USA and Australia, have laid down guidelines on vehicle paint spraying to reduce its polluting effect on the environment. The requirements for HVLP spray guns are contained in Rule 1151 of the South Coast Air Quality Management District of the States enacted in 1988. The Rule requires that vehicle repairing factories must use equipment complying with the stupilated standard so as to minimize environmental pollution caused by volatile organic solvents generated by paint spraying processes.

Why bother to Improve Paint Transfer Efficiency

Paint contains harmful additives and organic solvents. The use of spray guns, such as the HVLP, with high paint transfer efficiency can :

1. facilitate the adhesion of paint onto workpieces, reduce consumption of paint and lower operating cost

2. Reduce the dispersion of harmful paint fumes and organic solvent in the atmosphere, keep air a litter bit fresher, protect the health of you, your co-workers and neighbours

How HVLP spray guns reduce paint consumption?

HVLP spray guns are possible to reduce paint consumption primarily because they have higher paint transfer efficiencies than traditional ones. The paint transfer efficiency is a measure of how much paint adheres to the workpiece during paint spraying. The higher the paint transfer efficiency, the more paint will adhere onto the workpiece and less paint will rebound from them. In this way, paint wastage is reduced.

Apart from suitable hardware for paint spraying, the techniques and experience of operators in using HVLP spray guns, proper management and proper training for operators are indispensable for bringing out the benefits of using the HVLP spray guns.

How HVLP spray guns improve profits and what are their advantages?

• Reduce paint consumption, bringing reduction in cost

• Reduce discharge of volatile organic solvents and reduce pollution to the environment

• Reduce paint mist caused by paint spray and improve working environment

• Reduce discharge of pollutants, the working life of pollution control equipment is prolonged, reduce replacement frequency of parts and save maintenance costs.

• Reduce harmful effects on operators and neighbours

What points need to consider in using HVLP spray guns

• Supply of compressed air
  HVLP spray guns consume more air than traditional ones. Should one plan to purchase HVLP spray guns, he needs to check with suppliers about compressed air requirements of the spray guns and makes appropriate arrangement, such as power of air compressors, capacities of storage tanks, and sizes of compressed air supply pipeline so as to allow spray guns to work properly.

• To attain optimum atomization effect of HVLP spray guns, the appropriate pressure gauges should be used. Generally, adjust the atomizing air pressure to 0.7 bar (10 psig)

• Suitable adjustments to the paint spraying method
  HVLP spray guns use lower atomization air pressure than conventional ones and the distance between spray guns and workpieces as well as the spraying speed have to be suitably adjusted. HVLP spray guns are positioned closer to workpieces than conventional ones, about 10-15 cm (4-6 in). Spraying speed is lower than that for conventional spray guns.

• Adjustment on volume of paint to be Mixed
  HVLP spray guns have higher transfer efficiencies. When mixing paints, use a volume smaller than that for conventional spray guns to avoid wastage.

A comparison between HVLP and traditional spray guns

Does the market supply this kind of product?

There are different types of HVLP spray guns on the market for trade practitioners to choose.

Apart from HVLP spray guns, the market also offers spray guns of different designs. For instance, some spray guns use atomizing air pressure in between those for traditional and HVLP spray guns. According to overseas information, HVLP spray guns remain to be a more environmentally friendly type of spray guns.

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