Before has always told us about the automatic injection machine compared with some of the benefits of artificial injection, the same automatic injection machine assumed that the use of attention is also a brief occurrence of some shortcomings. For example, the active fuel injection equipment in the process of oil injection easy to occur two shortcomings - secret force is not strict and fisheye causes and treatment methods.

First, the secret force of the oil injection disadvantage is bad:

Also known as translucent or permeable color. The color paint can not completely hide the color of the original paint surface, or the color of the old paint film, the color of the primer layer penetrates into the paint layer, changing the color of the paint. Red and yellow paint layer presents infiltration color scene more.

(1) the cause of bad secret power

① the accumulation of color paint. The finish coat is not sufficiently stirred after dilution, and the pigment accumulates at the bottom of the container, resulting in excessive resin content in the spray paint, and the color becomes lighter.

② fault spraying skills. For example, each subsequent coating is not duplicated, resulting in strips of paint or a hidden bad picture.

③ Too much thinner is used to make the paint coating very thin.

(4) the old paint layer or the bottom coating, rich in pigment can cause seepage color, so the old paint layer should be carefully handled, can spray a layer of isolation layer can prevent seepage color.

(2) Amendment method. Assume that there are fine infiltration color, can spray satisfactory paint for secret. On the penetration of serious paint, it should be polished off, and then spray from scratch.

Two, automatic oil injection machine oil injection defects of the fish eye:

A fisheye is also called a shrinkage hole or bead hole. Small round pits appear on the finish, sometimes lax, sometimes aggregated.

(1)

1. Wax containing silicone is the most common cause of fisheye. Silicones are rich in abrasive materials used in sandpaper and in many car waxes and polishes. Silicones have a strong adhesion to the paint surface and are difficult to remove. A very small amount of wax can cause fisheye, so ensure that all silicone exposure is done in an isolated room away from the spray shop.

(2) primer surface pollution, such as oil on the primer, so before spraying must be sprayed surface cleaning clean, can use neutral cleaning agent.

(3) The compressed air used in the spray gun is seriously filtered to ensure the purity of the compressed air, because the silicone material is often found to come from the compressed air pipeline rather than the paint. The compressed air filter is emptied and cleaned every day to discharge the water and dirt in the filter, and the air compressor is drained every day.

(4) do not advocate the use of color paint rich in anti-fisheye remover, because the remover may pollute the surrounding oil injection machine equipment and other spraying parts, serious can cause the adhesion of the finish paint to reduce.

(2) Amendment method. Remove the affected area and spray oil from the head.