Category: Tutorial

In plastic painting line system, flame(or flamming) treatment is a popular setup to meet with high end painting requirements over different plastic materials. Especially for PP plastic, flamming is a must process for guaranteed contact to coating film. In this article we will introduce why it's important and how it works. Flame treatment refers to the process of oxidizing plastic surface with a strong oxidizing flame. It is mainly used to improve the painting characteristics and adhesive characteristics of polyolefin plastics. The technique is to increase surface activity and increase the primer adhesion to workpiece surface. Definition In order to facilitate the foaming compounding process, plastic surface tension value must meet the production requirements, surface tension value is generally required to reach about 41 dyne. However, polypropylene material surface tension…

UV painting is the most popular technology in lots of industries for various products surface finishing. Unlike most other type painting line system that can be easily operated, UV painting line has extremely high cleanness requirement. Not only to machine itself but also entire workshop construction. For some high end production requirements, the painting line clean room setup is same as medical grade. In this article we will indepth describe the operation process flow and some crucial parts technical configuration. Above is a typical UVpainting line layout for plastic vacuum metalization paint shop. Following is detailed process description NO. Content Method TEMP,℃ Time  NOTE 1 Load workpiece to fixture Manual RT   Fix product on custom jig 2 Load fixture to conveyor Manual RT     3 Electrostatic dust leaning…

Plastic metalization are often processed through uv painting and vacuum coating for various metal materials. UV painting and vacuum metalizing are two crucial steps to get perfect metal surface on plastic. To deal with different evironment requirements, we often need to apply various tests on plastic surface. That means we must choose a propriate technique to handle with. In this article we'll introduce the used technologies and compare the difference and advantages of the two vacuum coating solutions. UV Painting UV painting includes both base coat and top coat. Before vacuum metalizing, we must apply uv base coat first to get guaranteed contact between plastic and metal layer. Following is a typical chart of uv painting line system configuration. This design is workable with different plastic materials such as ABS,…

UV coating is featured for its low-temperature and rapid curing, thus it's ideal choice for automatic high-speed mass production requirement. UV paint provides extremely high gloss varnishing and widely used for various products including metal, plastic and woodware. Especially for plastic vacuum metalization, uv is always top class choice. In this article, we will briefly introduce UV coating application process and trouble shooting cases. UV painting line process flow The UV painting line process is as follows: Product loading Operators manually put the workpiece on fixture from loading area, chain conveyor passes through each functional part of the production line in turn. Preheat The purpose of preheating is to make sure product is completely dry for next surface treatment. If not, it may result in various finishing issues such as…

The application of automatic spraying system has become an important factor to measure the level of the coating production line. Automatic electrostatic spraying is one of the widely used spraying systems. The setting of process properties directly affects the coating quality. This article takes automatic electrostatic turbo bell coating as an example to find the influence of various process parameters in coating application. 1 - high voltage value of atomizer The principle of electrostatic turbo bell coating is by atomized paint thrown out through the edge and center of bell rotating at high speed, forming a cone-shaped atomized substance under the action of shaping air and high voltage, the workpiece is grounded, and the paint particles are charged with an electrostatic charge. Under the action of the electrostatic field between…

The Air-Operated Diaphragm Pump (AODP) is the most popular and cost-effective paint pump for coating applications. The flexibility of this configuration often creates some confusion when selecting a pneumatic diaphragm. In each application, different pump materials are suitable for a variety of factors such as pH, abrasive, temperature and fluid density. It is important to check the manufacturer's specifications and chemical compatibility guidelines before purchasing or operating. I - control corrosion When configuring a pneumatic diaphragm pump, it is a challenge to specify the pH of the safe handling chemicals and fluctuations in different concentrations, requiring proper selection of the pump components and pump body to ensure compatibility, avoid pump corrosion and reduce maintenance time. In applications where pH changes or when chemical concentrations may vary, plastic pump bodies such…

There are many different processes for plastic painting over different materials such as nylon, PP, PET, etc., In order to reach the best quality, we must apply necessary pretreatment in advance. In this article we'll briefly introduce popular 4 types pretreatment for plastic painting system, that is removal of internal stress, cleaning, de-dust and solving the problem of coating adhesion on plastic material. 1. Removal of internal stress Plastic products are prone to internal stress during molding injection, and stress concentration is very likely to occur during painting process, resulting in cracks in plastic parts. Flamming or full-face treatment can be used to eliminate stress. Flamming treatment is quick and direct fix (popularly used for car parts coating such as bumper). We can also heat the plastic part below the…

With the development of technology, the application of industrial robot is more and more popular. Industrial robot is a multi-purpose manipulator that can realize automatic control, reprogrammable, multi-degree of freedom, and freedom of motion to create a space-right angle relationship. The way its working mainly by completing linear motion along the X, Y, and Z axes. Because of its wide variety, motion axes and coordinate systems, it is easy to make mistakes, especially for novices. Robot motion axis The so-called axis of an industrial robot is about available degree of freedom. If the robot has three degrees of freedom, it can move freely along the x, y, and z axes, but it cannot tilt or rotate. When the number of axes of the robot increases, it is more flexible for…

Anti corrosion coating is widely used in metal industry such as architecture, furniture, automotive, ship and aircraft etc. It's crutial process for surface protection in different working conditions. There're lots of anti crossion coatings for various application, normally available as single component and two component coatings. In this article we'll generally introduce the technical process and precautions of application. What should you pay attention to when spraying single component coating? The use of single component coating is relatively straightforward, such as alkyd paints, chlorinated rubber paints, acrylic paints, and the like. Single-component coatings can also be used after opening the barrel. Stirring is the minimum requirement. Below the primer, anti-rust pigments and fillers may precipitate and separate from the resin. For topcoats, the color may not bloom. Evenly. By mechanical…