What is the working principle of hot melt adhesive coater

Hot melt adhesive coater is a kind of equipment that can melt a 100% solid fusible polymer that does not need solvent, does not contain water and is solid at room temperature. It is heated and melted to a certain extent to become a liquid adhesive that can flow and have a certain viscosity. It is coated on the substrate and usually contains composite components, which can compound another substrate with the substrate coated with adhesive. So what is the working principle of hot melt adhesive coater?

　　The working principle of automatic coater for screen printing is the same, but its performance varies from model to model and manufacturer to manufacturer. The screen coater is equipped with a device capable of clamping the vertical frame of the screen frame. The front and back of the screen area is a horizontal coating mechanism, which is composed of a coating box and mechanical or pneumatic components that control the angle and pressure of the coating box.

　　Both ends of the hot melt adhesive coater are installed on the vertical support arm of the coater. The coating mechanism moves up and down through the transmission of belt, chain or cable to coat along the surface of the screen. The transmission mechanism is connected with the servo or frequency conversion motor to make it run stably and accurately control the position of the coating mechanism.

　　Before coating, load clean and stretched screen plates from the front of the hot melt coater, and some models can also be loaded from the side. In the model mesh frame designed for large scale, side load is more common because the mesh frame is large and heavy, and side load can reduce lifting, lifting and movement. When the automatic screen coater runs online with other automatic screen processing equipment (such as cleaning equipment, regeneration equipment, drying equipment and developer), it is more convenient to load the printing plate from the side.

　　No matter how the screen is installed, once the screen is in the correct position, the pneumatic clamping device or mechanical clamping device will close to lock the screen. In order to make Cao more convenient, many models have pedals to control the movement of the board clamp, so that Cao authors can free up their hands to control the screen. After installing the screen plate, pour the corresponding photosensitive emulsion into the hot melt adhesive coater to start coating. According to the functions of the control system and equipment, the equipment can coat both sides of the screen at the same time. There are two ways of coating: one is to apply the photosensitive emulsion on the screen by wet pressing Cao for many times; Alternatively, a drying process may be added after each application. A machine for quantitatively coating a liquid (or molten) polymer material (such as an adhesive or coating) on the surface of a material.