The first technique of spraying is how to hold the gun correctly. The spray gun and the workpiece to be sprayed should be kept vertical. When the spray gun moves, its spray path should be parallel to the spray surface. After each spray stroke starts, the gun will be triggered. Before the end of each spray stroke, the gun should be released. Before the trigger is triggered, the gun should be in motion, otherwise it will produce local parts. The coating is too thick; keep the distance between the gun and the workpiece constant; the spray gun should maintain a uniform motion during spraying; the spray surface of the next spray stroke should be consistent with the overlap of the spray surface of the previous spray stroke; for the same workpiece, The number of spray strokes is the same. 1. The distance between the spray gun and the surface of the spray gun is usually between 15 and 30 cm. For a drier, darker, and thicker coating, the distance is closer; for a drier, lighter, and thinner coating, the distance can be farther. 2. The spray stroke operation mode of the spray stroke, including the angle of the spray gun to the surface of the coated object and the running speed of the spray gun, should keep the spray gun and the surface of the coated object at right angles and run in parallel. The speed of the spray gun is generally adjusted within 30 to 60 cm/s and is required to be constant. If the spray gun is tilted and runs in an arc shape or the speed of movement is variable, a paint film of uniform thickness is not obtained, and streaks and marks are easily generated. When the speed of the spray gun is too slow (30cm/s), it is easy to sag. The adjacent spraying stroke should have a lap joint, that is, the coincidence rate, and the coincidence rate should reach 50% to 67%, as shown in Fig. 8. When it is too fast or there are not many overlaps, it is not easy to obtain a smooth paint film. When the uniformity of the thickness of the paint layer is required to be high, the cross-spray method should be adopted, that is, the vertical spray is applied first, and then the horizontal spray is applied. This article is transferred to Xinyanbao Trading Co., Ltd. |
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