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金刚网静电喷塑的工作原理和工序

时间:2020-03-06 22:09:14 作者:金刚网 点击:

金刚网静电喷塑的工作原理和工序 

  静电喷塑技术的基本原理是:静电发生器产生负高压(10 kV左右),利用电晕放电现象使粉末涂料或称塑粉吸附在金属工件上,粉末涂料由供粉系统借压缩空气产生的力将其送入喷枪,在喷枪前端加有高压静电发生器产生的负高压。由于电晕放电,在其附近产生密集的电荷,粉末由枪嘴喷出时,形成带电涂料粒子。它受静电力的作用,被吸附到金属工件上,经过加热使粉末熔融,并自然冷却固化,在工件表面形成坚硬的薄膜涂层。为了使塑粉能够吸附在金属表面上,必须先对表面进行处理,除油→水洗→酸洗→水洗→表调→磷化→水洗→干燥。在此过程中,同时进行锅炉蒸汽加热,节省了磷化时间;在干燥池中加入热吹风扇,加快了干燥速度。静电喷塑后,挂件随流水线进入电烘箱。随着燃油价格的逐步攀升,电加热系统开始凸显优势,同样发热量的加热系统,电加热系统的运行耗费比燃油的要低很多,而且燃油易挥发、不安全,所以,电加热系统也成为首选的加热方式,加热到预定温度(根据产品厚度大小,一般在200 ℃左右),并保温15~30 min,使之熔化、流平、固化,开炉取出冷却即可得到成品。 

金刚网静电喷塑的工作原理和工序(图1)

The basic principle of electrostatic spraying technology is that the electrostatic generator produces negative high voltage (about 10 kV), uses corona discharge phenomenon to make powder coatings or plastic powder adsorb on metal workpieces, powder coatings are sent into the spraying gun by the force of compressed air generated by the powder feeding system, and the negative high voltage electrostatic generator is added to the front of the spraying gun. Pressure. Due to corona discharge, dense charges are generated near it. When powder is ejected from the nozzle, charged coating particles are formed. It is adsorbed to the metal workpiece by the action of electrostatic force. After heating, the powder melts and solidifies naturally, forming a hard film coating on the surface of the workpiece. In order to make the plastic powder adsorb on the metal surface, the surface must be treated first, degreasing washing pickling washing surface adjustment phosphating washing drying. In this process, boiler steam heating is carried out at the same time, which saves phosphating time, and the drying speed is accelerated by adding a hot-blower in the drying pool. After electrostatic spraying, the pendant enters the electric oven with the production line. With the gradual rise of fuel price, electric heating system began to highlight its advantages. In the same calorific heating system, the running cost of the electric heating system is much lower than that of the fuel, and the fuel is volatile and unsafe. Therefore, the electric heating system has become the preferred heating method, heating to a predetermined temperature (according to the thickness of the product). Size, generally around 200 C, and heat preservation for 15 - 30 minutes, so that it melts, levels, solidifies, open the furnace to take out cooling can be finished products.