In the 18th segment of our video series “Airless Q&A” we deal with a request for the spray pattern width of Airless nozzles. A customer wanted to know which are the widest nozzles in the market. He wanted to inject a large project with very large closed areas. Therefore, his idea was to use nozzles with as wide spray tip, so that the spray jet was wide as possible in order to spray a large surface with each pass and to handle the project in a time-saving and economical way.
Classic Airless nozzles are available from major manufacturers such as Wagner and Graco in spray angles of 50, 60, 70 and even 80 or 90 degrees (for example Graco RAC X or Wagner TradeTip 3 nozzles). The widest of these already cover a large surface area, but there are also special nozzles that go even wider! Both The Graco and Wagner have brought out spray tips with a spray angle of 120 degrees. 120 degrees results in about a 60 cm fan width (24 inches) on the surface, so it is used to create a spray jet for very large areas.
How wide is a wide Airless spray tip?
An Airless spray tip producing a spray angle of 120 degrees with a fan width of 24 inches (60 cm) is considered a wide spray tip. Examples include 1219, 1221, 1223, all the way to 1239.
What wide angled Airless spray tips are available?
Graco has their WideRac range from 1221 to 1239 and Wagner has their WideFinish range from 1219 to 1237. These wide angled spray tips produce a spray angle of 120 degrees, with a fan width of 24 inches (60 cm).
Advantages of wide-angle Airless nozzles
Larger areas can be coated quickly, because with each paint spraying stroke, more surface can be coated than with normal nozzles with a beam width of, for example 50 degrees (like 517).
Disadvantages of wide-angle Airless nozzles
As the fan width widens, so the deflection of the material increases and there is less impact directly onto the spraying surface – this means more overspray is created. In addition, the wide-angle nozzles require a little more pressure. Less suitable are the wide-angle nozzles for smaller areas or projects with many recesses such as windows or doors. Here one relies more on conventional nozzle technology with smaller spray angles.
For further information on the selection of the optimum spraying angle, read more here: article for determining the spray fan width (video included).
Which Wagner wide-angle nozzles are available – Wagner WideFinish?
Wagner offers the WideFinish nozzles in the following nozzle sizes:
- Wagner WideFinish – 1219 – order here
- Wagner WideFinish – 1221 – order here
- Wagner WideFinish – 1223 – order here
- Wagner WideFinish – 1225 – order here
- Wagner WideFinish – 1227 – order here
- Wagner WideFinish – 1229 – no longer available from the manufacturer Wagner
- Wagner WideFinish – 1231 – no longer available from the manufacturer Wagner
- Wagner WideFinish – 1233 – no longer available from the manufacturer Wagner
- Wagner WideFinish – 1235 – no longer available from the manufacturer Wagner
- Wagner WideFinish – 1237 – order here
What Graco wide-angle nozzles are there – Graco WideRac?
Graco also offers nozzles with a 120 degree spray angle with the Graco WideRac nozzles for large-area airless spraying. The following WideRac nozzles are available:
- Graco WideRac – 1221 – order here
- Graco WideRac – 1223 – order here
- Graco WideRac – 1225 – order here
- Graco WideRac – 1227 – order here
- Graco WideRac – 1229 – order here
- Graco WideRac – 1231 – order here
- Graco WideRac – 1233 – order here
- Graco WideRac – 1235 – order here
- Graco WideRac – 1237 – order here
- Graco WideRac – 1239 – order here
Correctly adjusting the size of the bore hole when choosing a larger spray jet width
It is important to adjust the nozzle bore hole size accordingly when using a wide-angle nozzle. If the spray fan width is wider, more materials needs to pass through the spray tip opening, otherwise not enough material will land on the coating surface. A standard Graco RAC X 621 nozzle (60 degree fan width, 0.021″ bore size) sprays a 30 cm wide jet onto the surface and distributes about 1.8 liters per minute with continuous spraying.
A wide-angle nozzle such as the Graco WideRAC 1221 (120 degree fan width, 0.021″ bore size) injects approximately a 60 cm wide jet onto the surface, ie twice as wide as the 621. However, the nozzle bore is the same for both nozzles and therefore the 1221 wide-angle nozzle also injects 1.8 liters per minute. So the same amount of material is flowing through the spray tip, however, this amount of color needed to be applied is on twice the area. The bottom line is that the 1221 wide-angle nozzle has 50% less material on the surface than the 621 nozzle. In this case, it would be advisable to select a larger nozzle bore, if you want to apply the same amount of ink with the wide-angle nozzle as with the 621er nozzle. A suitable spray tip would be the 1229 or 1231 in this case. The table gives a precise overview of the flow rate per minute.
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