Rolled substrates, such as paper, cloth, leather, aluminum foil, plastic film, etc., are coated with a special function of glue, paint, or ink, and dried and then wound up.
The working principle of the automatic coating machine: The working principle of the automatic coating machine for screen printing plate making is the same, but its performance varies according to different models and different manufacturers. The screen coating machine is provided with a device capable of clamping a frame in a vertical rack. The front and back of the screen area is a horizontal coating mechanism. The coating mechanism consists of a coating tank, and mechanical or pneumatic components that control the angle and pressure of the coating tank.
Both ends of the coating mechanism are mounted on the vertical support arm of the coating machine, and the coating mechanism is moved up and down along the surface of the screen through the transmission of a belt, a chain or a cable. The transmission mechanism is connected to a servo or variable frequency motor to make it operate smoothly and accurately control the position of the coating mechanism.
Prior to coating, a clean, stretch-absorbing screen is loaded from the front of the coater, and some models can also be loaded into the screen from the side. In models designed for large format frames, side loading is more common, because the frame is large and bulky, and the side loading makes it possible to increase the amount of lifting and handling. When the automatic screen coating machine is operated online with other automatic screen processing equipment (such as cleaning equipment, regenerating equipment, drying equipment and developing machine), loading from the side is more convenient.
Regardless of how the screen is mounted, once the screen is in the correct position, the pneumatic clamping device or the mechanical clamping device is closed, locking the screen. In order to facilitate the operation, many models have a foot pedal to control the clip action, and the operator can free his hands to control the screen. After the screen is installed, apply the corresponding emulsion to the automatic coating machine and start the coating. According to the functions of the control system and the equipment, the equipment can coat both sides of the screen at the same time.
There are two kinds of coating methods. First, the sensitized emulsion is coated on the screen by a plurality of wet-pressing operations, or a drying process is added after each coating. A machine that quantitatively coats a liquid (or melt) polymer material such as an adhesive or paint on the surface of a material.
Suitable for the production of flexible substrates such as PVC/PE film
Simply put the glue on the film. Specific controls include gluing, drying, rewinding, and tensioning.
The film can be PVC, PE, PET... It can also be some paper, such as hot melt adhesive on release paper.