Brush type
The brush coater is the oldest coating equipment and was originally used in the 1850s to produce coated wall paper using porcelain clay. There are 3 different types of brush coating heads: round brush coating heads, blanket roll coating heads, and blanket coating heads. Figure 1 shows an early-stage brush coating head.
Air knife
The advent of air knife coaters in the 1930s marked the birth of the modern paper coating industry. The air knife coating machine overcomes the above shortcomings of the brush coater and is rapidly promoted, resulting in a sharp increase in the production of coated paper.
Scraper type
The first scraper coater patent appeared in the 1950s. Since then, the blade coater technology has been rapidly developed. According to different feeding equipment, scraper type and scraper installation position, scraper coating head is also divided into many kinds, such as hard blade scraper coater, drag blade scraper coater, soft blade scraper coater, fountain type Blade coater, short dwell blade coater, bill blade coater, blade roll coater, and the like.
Roller type
In roll coating, the coating roller applies the coating to the coating surface, and the coating is mainly performed in the coating machine. The amount of coating can be adjusted by measuring the pressure between the rollers, the pressure is enhanced, the throughput of the coating is reduced, and the coating amount is reduced. Roller coater type:
1, press roll coating head
2, reverse roller coating head
3, transfer roller coating head
4, gravure roller coating head
Spray coating
Spray coating technology is a non-contact coating method that uses controlled high-pressure spray technology to coat paper or paperboard on one or both sides (sizing).
Curtain coating
The multi-layer curtain coater can impart three-layer structure (bottom layer, absorbent layer and top layer) to the surface of the ink-jet printing paper with only one coating operation, and can obtain a uniform coating on the uneven paper surface.
Slit coating
The slit coating head includes a coating liquid storage tank, a pump for pumping the coating liquid in the coating liquid storage tank to the nozzle through the supply line, and a control part for controlling the operation of the pump and the nozzle. The pressure detection unit detects the pressure of the pipeline, and the nozzle discharges the coating solution when the pressure reaches a predetermined pressure condition.