Category: Tutorial

The automotive coating process belongs to decorative and protective multi-layer coating, which includes the most processes and the highest coating quality requirements for automotive finishing. General coating process system According to the layer of coating, commonly used coating process system include: Two coating systems (primer + topcoat); Three-coating system (primer + middle coat + topcoat or metallic glitter paint/varnish); Four-coating system (primer + middle coat + topcoat + varnish, suitable for luxury cars with higher coating requirements). Generally, the mostly used is the three-coating system, it's widely used for the body of the car, bus and the cab of the truck with high decorative requirements. According to the drying conditions, its available as drying system and self-drying system. The drying system is suitable for automobile coating produced by mass assembly…

In surface finishing industry, sometimes we need to give metallic treatment for different materials. Normally we use vacuum metallization or electro plating directly, but if we need to apply a specific design to surface, these solutions are not perfect and we need to source another way called "gold stamping". Gold stamping overview Gold stamping or sometimes known as hot stamping. The process uses the principle of hot pressure transfer to transfer the anodized aluminum layer onto substrate surface to form a special metallic effect. Becase the main material used for stamping is anodized aluminum foil, gold stamping is also called anodized aluminum hot stamping. The most commonly used in printing industry is to hot stamp electrochemical aluminum foil on paper, which is called gold stamping. It is a general term…

Painting robot is an industrial robot that can carry out automatic painting or spraying other coatings, mainly composed by robot body, a computer and the control system, hydraulic painting robot also includes a hydraulic oil source, such as an oil pump, an oil tank and a motor. Mostly using 5 or 6 degrees of freedom structure, the arm has a large space for movement, and can do complex trajectory movements, its wrist generally has 2~3 degrees of freedom, can move flexibly. So, what are the terms for painting robots and its key parameters? Painting robot main terms Painting robot motion efficiency, coating efficiency and application efficiency Motion efficiency refers to the efficiency of coating operations, including the effective utilization rate of spraying area, coating and spraying area per unit time.…

Overview of coatings Coatings are complex chemical mixtures. Generally speaking, coatings are mainly composed of primary, secondary and auxiliary film-forming substances. The main film-forming material is an indispensable part of the coating, which plays a leading role in the performance characteristics of the coating layer. Secondary film-forming substances refer to various pigments, fillers, which cannot be filmed alone, but are important components that make up the layer and affect their properties. Anancillary film formers include solvents and many other additives that improve the properties of coatings and coatings. Classification of paints According to the state of the coating: powder coating and liquid coating; According to gloss: glossy paint, flat paint and matte paint; According to the drying method: self-drying paint, baking paint, infrared drying paint and ultraviolet drying paint (i.e.,…

For UV coating application, it's crucial to understand how much UV energy required in order to have it properly cured. Only after we confirmed the amount of energy we can then determine how many UV lamps to install with specific power. In order to properly configure the UV oven, there's a variety of properties we need to take into consideration during our calculation. Following we will introduce a formula for quick calculation. Points to consideration For accurate calculation we need to understand the following - type of product for painting, line speed and the time to stay under uv light. Type of product - Different products require different uv coating to work with. For example the uv coating for plastic and metal parts have different components and required uv radiation…

Ultrasonic spraying is a coating deposition process that utilizes ultrasonic atomization technology. Firstly, the coating material to be deposited is configured into liquids such as sols or suspensions, which are then atomized into micron-sized droplets through a special ultrasonic atomization device called ultrasonic nozzle. These atomized coating will then evenly deposited on the substrate surface by pressurized air. Ultrasonic spraying is considered an economical and superior deposition process for certain materials that can be used to obtain a comparable quality coating at affordable deposition equipment such as vapor deposition or sputtering. Comparing to traditional single-fluid or two-fluid spraying (air spraying), ultrasonic spraying has significant advantages such as very soft and uniform atomization, non-clogging spray guns, and highly controllable spray flow, so as to obtain much higher raw material utilization rate…

Painting on metal surface requires necessary pretreatment in order to achieve the best finishing. Among the various solutions, phosphating is the most popular choice for mass production. Phosphating or phosphate conversion is a process of chemical treatment over metal part. The chemical conversion on metal surface provides a protective layer which is uniform and inert to the environment. Phosphate process includes zinc phosphate, iron phosphate, chromate, or manganese phosphate. Benefits of the phosphate treatment include: better adhesion for post processes like powder coating paint improved corrosion resistance surface that is tightly bonded to the base metal. Phosphating can be performed on ferrous (iron, steel based) and non-ferrous surfaces (zinc, chrome, aluminum, and manganese). Wash and Phosphating Phosphate wash is properly preparing the parts by cleaning residues left from prior processes…

Electrostatic Painting Principle and Composition Electrostatic painting uses the workpiece as the positive electrode(usually grounded). The paint atomization device is the negative electrode which is connected to the negative high voltage power supply. Between is a high-voltage electrostatic field with the workpiece. The paint is squeezed into the nozzle at high speed under compressed air then hits on the nozzle, here it's negatively charged and forms micron-sized atomized particles then spray through the circular outlet of the nozzle. Due to the effect of corona discharge, the paint particles repel each other and further atomize. According to the principle of "opposites attract each other", the negatively charged paint medium forms an embracing effect on the workpiece under the action of the electric field force, along the power line directionally flow to…