What Is A Coating Machine

The coating machine is used for the coating and production of BOPP sealing adhesive tape. Sozhixing Machinery specializes in the production of PE/OPP/BOPP protective film/tape coating machines, etc. This machine is to coat the rolled substrate with a specific function Glue, paint or ink, etc., and rewind after drying. It uses a dedicated high-speed coating head, which can effectively reduce the generation of bubbles. The rewinding and unwinding of the coating machine are equipped with a full-speed automatic film splicing mechanism, and the tension is automatically controlled by a closed loop.

The coating machine is used for the coating production of BOPP sealing adhesive tape. Coat the rolled substrate with a layer of glue, paint or ink with specific functions, and wind it after drying. It uses a dedicated high-speed coating head, which can effectively reduce the generation of bubbles. The rewinding and unwinding of the coating machine are equipped with a full-speed automatic film splicing mechanism, and the tension is closed loop automatically.


Coating machine classification


Brush

The brush coater is the oldest coating equipment, originally used in the 1850s to produce coated wall paper using porcelain clay paint. There are 3 different types of brush coating heads: round brush coating head, blanket roll coating head and blanket coating head. Figure 1 shows a brush coating head used early.


Air knife

The advent of the air knife coater in the 1930s marked the birth of the modern paper coating industry. The air knife coater overcomes the above-mentioned shortcomings of the brush coater and is quickly promoted, resulting in a sharp increase in the output of coated paper.


Scraper

The first patent for a knife coater appeared in the 1950s. Since then, the blade coater technology has developed rapidly. According to the different feeding equipment, blade type and blade installation position, the blade coating head is also divided into many types, such as hard blade blade coater, drag blade type blade coater, soft blade blade coater, fountain type upper Material knife coater, short residence knife coater, Bill knife coater, knife roll coater, etc.


Roll

Roll coating uses a coating roller to apply paint to the coating surface, and in-machine coating is mainly based on this type of coating machine. The coating amount can be adjusted by measuring the pressure between the rollers, the pressure is strengthened, the throughput of the coating is reduced, and the coating amount is also reduced. Types of roll coater:

1. Press roll coating head

2. Reverse roller coating head

3. Transfer roller coating head

4. Gravure roll coating head


Spray coating

Spray coating technology is a non-contact coating method, using a controlled high-pressure spray technology to coat paper or cardboard on one or both sides (sizing).


Curtain coating

The multi-layer curtain coater only needs to go through a coating operation to give the inkjet printing paper a three-layer structure (bottom layer, absorbent layer).

And top layer), and can obtain uniform coating on uneven paper surface


Slit coating

The slit coating head includes a coating liquid storage tank; a pump, which is used to pressure the coating liquid in the coating liquid storage tank to the nozzle through a supply pipe; a control part, which is used to control the operation of the pump and the nozzle , The pressure detection part is used to detect the pipeline pressure. When the pressure reaches a predetermined pressure condition, the nozzle removes the coating liquid.


Principle of Coating Machine Application

Use of automatic coating machine

Suitable for gluing shoe materials, electronics industry, sponge, EVA, PE, cloth, etc.

1. Process requirements

The coating machine needs to evenly adhere glue or ink to the surface of aluminum foil, plastic film or cloth textiles, which requires a relatively high coating process, not only requiring uniform coating height, but also high-speed non-stop roll change to improve production efficiency.

2. Program advantages

The frequency converter completes the tension control at all levels, and the tension sensor is used to realize the tension control. The system is simple and stable. Use PLC or synchronous controller to control the speed of the drive roller inverter, and at the same time as the linear speed signal of other inverters.

S350 closed-loop tension control (sensed vector control) easily realizes constant tension during acceleration and deceleration, saves space for installing tension rollers, reduces mechanical costs, and high-precision control ensures a highly uniform coating effect.

Double-station rewinding and unwinding has a pre-drive function, which can meet the needs of high-speed non-stop automatic roll change and improved production efficiency. At the same time, accurate winding control can avoid the bad winding of the cabbage style and make the winding effect better.


Coating machine workflow

Coat the rolled substrate, such as paper, cloth, leather, aluminum foil, plastic film, etc., with a layer of glue, paint or ink with a specific function, and then wind it after drying.

The working principle of the automatic coating machine: the working principle of the automatic coating machine used for screen printing plate making is the same, but its performance is different according to different models and different manufacturers. The screen coating machine is equipped with a device that can clamp the screen frame on the vertical frame. Before and after the screen area is a horizontal coating mechanism, which 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 installed on the vertical support arms of the coating machine, and the coating mechanism is moved up and down through the transmission of belts, chains or cables to coat along the surface of the screen. The transmission mechanism is connected to the servo or frequency conversion motor, so that it operates smoothly and can precisely control the position of the coating mechanism.

Before coating, the clean, stretched screen is loaded from the front of the coating machine, and some models can also be loaded from the side. In the models designed for large-format screen frames, side-mounted version is more common, because the screen frame is large and heavy, and the side-mounted version can make the lifting and moving amount smaller. When the automatic screen coating machine and other automatic screen processing equipment (such as cleaning equipment, regeneration equipment, drying device and developing machine) are operated online, it is more convenient to install the 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 is closed to lock the screen. In order to make the operation more convenient, many models have a foot pedal to control the plate clamping action, and the operator can free up his hands to control the screen plate. After installing the screen, pour the corresponding photosensitive emulsion into the automatic coating machine, and then 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 coating methods. One is to coat the photosensitive emulsion on the screen through multiple wet pressing operations; or to add a drying process after each coating. A machine that quantitatively coats liquid (or melt) polymer materials such as adhesives or coatings on the surface of the material. Suitable for the production of flexible substrates such as PVC/PE film. Simply put, the glue is applied to the film. Specifically, it includes gluing, drying, winding and tension control. The film can be PVC, PE, PET... or some paper, for example, hot melt glue is coated on release paper.