02B_喷涂技术及不良分析.ppt

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02B_喷涂技术及不良分析

發白 現象:涂膜光澤低并在局部存現霧狀白色 1.作業環境濕度太高 2.涂料溶劑的揮發性太高 3.被涂物表面溫度太低 4.濕膜中含有水分 5.稀釋劑選用不當 產生原因: * * * * * * The process of spray painting is most simply defined as a mechanical means of applying paint. Mechanical because machines are used to provide the power source, the control of that power and either automatic or hand tools are used to apply the material to the substrate. This comparison of course is with using either brushes or rollers. Generally in the refinish business, paint is applied using a spraygun, and to use this a good quality supply of compressed air must be provided. * * * The suction spraygun has the paint container underneath the gun. A stream of compressed air creates a vacuum at the air cap, providing a siphoning action. This is known as the venturi effect. Atmospheric pressure on the material in the suction cup farces the material to the fluid tip. The number and size of holes in the air cap contribute to how the paint is atomised. These types of guns have been in common use in the refinish business for many years, and are capable of applying a whole range of materials. The Fluid needle and nozzle combinations come in a variety of sizes, and should be selected, depending upon the viscosity of the paint being applied. - The higher the viscosity, the larger the fluid tip that should be used. Common suction fed sprayguns are :- Devilbiss JGA Sata Jet * Electrostatic sprayguns are connected to a source of high voltage, which is applied to the paint as it passes through the spraygun. The object to be painted must be very well earthed, so that the positively charged paint is attracted to it. When the face of the object is coated it becomes insulated, and the paint is then attracted to the rear of the object. In this way, tubes can be completely coated form one side. * * Good quality paint application equipment costs a lot of money, but it is worth buying good quality equipment as it will repay you in terms of quality and length of service. Always maintain

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