Compressed Air Gun Spraying

Cottony Peach Scale Tests. Studies made on the cottony peach scale were limited, but the results obtained are considered reliable. All of the tests reported here were conducted in 1947 under orchard conditions. A heavily infested peach orchard at Hamlin, N. Y., was used for the experiment. Because the supply of the isoparaffins available was very limited, it was necessary to devise a procedure whereby satisfactory tests could be conducted with only 600 to 1000 ml. of spray mixture per test. Treatment was usually restricted in each test to two carefully selected attached branches 1 to 2 feet in length. A third branch was sprayed at the same time to provide leaves for oil deposit determinations. Treatments were applied on July 18 and 19, 1947. At this time all the eggs produced by the overwintering females had hatched, and the resultant new generation scales had largely moved to the leaves where they occurred on the lower surface along the midrib. A compressed air paint spray gun, operating at 30 pounds pressure, was used to apply the spray treatments. 

The oldest method, which is still in use today, is employing compressed air guns in which the stream of the liquid is driven through the nozzle orifice by pressures 1-5 kPa (1.5-7 psi). In general, they are less expensive than other spray guns and atomization... 

Commercial blood-albumin spreader was used as the emulsifying agent at the rate of 4 ounces per 100 gallons of finished spray mixture (24) The emulsion was applied to the fruit by means of a commercially available air-pressure paint spray gun (Type MBC, made by the De Vilbiss Co., Toledo, Ohio). The paint spray gun was operated with compressed air at a pressure of 30 pounds per square inch. The fruit were placed singly on a small turntable, so that the center of the fruit was at the same height as the face of the nozzle of the spray gun and 30 inches in front of it. The turntable was set at 30 r.p.m. Each fruit received a uniform exposure of four revolutions to the spray stream in accord with the following routine ... 

Spray guns (of glass or plastic), operated by compressed air or a rubber bulb-type hand blower (e.g. Fig. 2.135) are available from, for example, Bibby Science, or Shandon. This spraying operation must of course be carried out with considerable care and it is advisable to place the plate at the bottom of a large rect-... 

In conventional air spraying, compressed air and paint are supplied to the spray gun, which atomize and transport the paint to the article being coated where they are deposited forming a uniform film. The air pressure used in this operation is critical and it should be kept at the minimum required amount, to atomize and deposit the paint onto the substrate. 

Hydrogenated and modified castor oil is used as an additive to adjust the viscosity and facilitate application with a brush or spray gun (compressed air or airless) layer thicknesses of > 100 pm are thereby achieved [2.11]-[2.13]. 

Concrete gun n. A spray gun used in applying freshly mixed concrete compressed air forces the concrete along a flexible hose and through a nozzle. 

Spray gun (1920) n. A tool, operated with compressed air or fluid pressure, which... 

High-volume, low-pressure spray coaters use turbines rather than pumps to supply high volumes of low-pressure, heated air to the spray guns. Newer versions use ordinary compressed air. The air is heated to reduce the tendency to condense atmospheric moisture and to stabilize solvent evaporation. Low atomizing pressure results in lower droplet velocity, reduced bounce-back, and reduced overspray. The... 

Figure 1. Adhesive application by means of a spray gun a) Adhesive b) Compressed air c) Atomized adhesive... 

Spray Gun n (1920) A tool, operated with compressed air or fluid pressure, which expels paint, mortar, etc., through a small orifice, onto the surface being coated. Syn Air Brush and Spraying Pistol. See... 

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