company news about What factors are related to the thickness of the workpiece plastic powder processed by electrostatic spraying?

The preparation work to be done before spraying is as follows: 1. First of all, understand what equipment is needed for spraying. The overall spraying process requires drying curing system, spraying center, recycling powder room, etc. 2, spraying needs to calculate the size of the required equipment according to your actual needs (size, shape, daily output and other parameters of the target workpiece of spraying), such as oven size and powder room. According to the selected plan, statistics and lists of equipment and materials that need to be purchased and produced in the spray. Of course, it is also a good choice to find a professional spraying equipment manufacturer to customize. 3, according to the material and economic situation of the product, understand the process and equipment requirements of spray pretreatment (oil removal, rust removal, phosphating, etc.).

What factors are related to the thickness of the workpiece plastic powder processed by electrostatic spraying equipment? This question has been asked several times in electrostatic spraying, and it is really necessary to let everyone know. Today, the painting Lao Wang of Xinkaisheng shares the following points for you: The coating thickness of the workpiece processed by electrostatic spraying is mainly determined by the following three aspects: 1, the original temperature of the workpiece. It's very simple. If your workpiece is preheated before spraying, it should still have a residual temperature of 150 degrees Celsius during the spraying process. The spray must be thicker. The principle is well known. 2, the powder itself, the powder used in the spray processing, some natural spray will be relatively thick, and some will be relatively thin. This is determined by the size and composition of the powder. 3. Critical thickness of charge repulsion effect. In the process of electrostatic spraying, when the powder is adsorbed on the workpiece to a certain thickness, because the charge on the powder on the workpiece is the same as the charge on the powder sprayed behind. When the polarity is the same, the powder behind will rebound due to the polarity repulsion of the charge; The existence of this effect makes it easier to obtain a uniform thickness coating during the spraying process.

What equipment is required for good material combination spraying to meet the needs of the spraying process. The substrate surface must be pre-treated, including several steps such as surface pretreatment, purification, coarsening and bottom bonding. (1) Surface pretreatment is to turn, grind and other surface treatment of the workpiece before spraying, and remove the original spraying layer and other surface treatment layer (quenched layer, carburized layer, etc.) on the workpiece. Reserve burrs, patching surface uneven wear, spray layer thickness to ensure appropriate substrate surface and dimensional accuracy after spraying. (2) The purpose of purification treatment is to remove all dirt on the surface of the workpiece, such as grease, paint, rust, oxide and other dirt. Among them, grease and rust are the representatives, so simply put: the key to purification treatment is to remove oil and rust, and there are many ways to remove oil, mainly solvent cleaning, water-based cleaning agent cleaning, lye (and acid) cleaning, electrolytic cleaning, emulsification cleaning, ultrasonic cleaning, supercritical carbon dioxide cleaning and heating degreasing; The main methods of rust removal include chemical rust removal, spot chemical rust removal, flame rust removal, mechanical rust removal (sandblasting, rolling, manual and power tools). (3) The purpose of roughening is to increase the contact surface between the coating and the substrate, increase the mechanical biting force between the coating and the aggregate, and make the purified surface more active to improve the coating and the substrate. At the same time, the roughening of the substrate surface also changes the residual stress distribution in the coating, which is also conducive to improving the bonding strength of the coating. Methods of roughening include sandblasting and machining (such as threads, knurls), electrodrawing and macroscopic roughening, of which sandblasting is the most commonly used roughening method. (4) The bonding layer is to spray some coating materials that are not well bonded with the substrate. Which equipment is needed to spray the material, first select the material that is bonded with the collective material and spray the transition layer to strengthen the bonding between the coating and the substrate. The commonly used materials for bonding the bottom layer are Mo, NiAl, NiCr, aluminum bronze, etc., the thickness of the bottom layer is generally 0.08~0.18μm, many methods of purification and rough surface, the selection should be based on the material and shape of the base material, thickness, original surface condition, the design requirements of the coating and construction conditions to choose.