1. Brush type: brush type coating machine is an ancient coating equipment. It was used in the 1850s to produce coated wall wallpaper with porcelain clay coating. There are three different types of brush applicator: round brush applicator, blanket roller applicator and blanket cover applicator. Figure 1 shows an early brush coating head.

2、氣刀：20世紀30年代氣刀涂布機的問世標志著現代紙張涂布工業的誕生。氣刀涂布機正是克服了刷式涂布機的上述缺點，迅速被推廣，導致了涂布紙產量的急劇增加；

2. 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 has overcome the above shortcomings of the brush coater and has been rapidly promoted, resulting in a sharp increase in the output of coated paper;

3、刮刀式：20世紀50年代出現了個刮刀式涂布機專利。此后刮刀涂布機技術得到了快速的發展。根據上料設備、刮刀類型和刮刀安裝位置的不同，刮刀涂布頭也分為許多種，如硬刃刮刀涂布機、拖刀式刮刀涂布機、軟刃刮刀涂布機、噴泉式上料刮刀涂布機、短駐留刮刀涂布機、比爾刮刀涂布機、刮輥式涂布機等；

3. Scraper type: In the 1950s, a scraper type coating machine patent appeared. Since then, the technology of scraper coater has developed rapidly. According to the different feeding equipment, scraper type and scraper installation position, the scraper coating head is also divided into many types, such as hard blade scraper coating machine, drag blade scraper coating machine, soft blade scraper coating machine, fountain type feeding scraper coating machine, short dwell scraper coating machine, Bill scraper coating machine, scraper roller coating machine, etc;

4、輥式：輥式涂布是用涂布輥向涂布面施以涂料，機內涂布以此類涂布機為主。涂布量可通過計量輥間壓力進行調節，壓力加強，涂料的通過量減少，涂布量也就減少。輥式涂布機的類型：壓榨輥式涂布頭、逆轉輥式涂布頭、傳遞輥式涂布頭、凹版輥式涂布頭；

4. Roller type: roller type coating is to apply coating to the coating surface with the coating roller, and the internal coating is mainly based on this type of coating machine. The amount of coating can be adjusted by measuring the pressure between the rollers. When the pressure is increased, the amount of coating will be reduced. Type of roller coating machine: press roller coating head, reverse roller coating head, transfer roller coating head, intaglio roller coating head;

5、噴霧涂布：噴霧涂布技術是一種非接觸涂布方式，采用可控高壓噴霧技術可對紙或紙板進行單面或雙面涂布（施膠）；

5. Spray coating: spray coating technology is a non-contact coating method. Controlled high-pressure spray technology can be used to coat paper or paperboard on one or both sides (glue);

6、簾式涂布：多層簾式涂布機只需經過一次涂布操作就能夠賦予噴墨打印紙表面三層結構(底層、吸收層

6. Curtain coating: The multi-layer curtain coating machine can endow the inkjet printing paper with three layers of structure (bottom layer and absorption layer) after only one coating operation

和頂層)，并能夠在不均勻的紙張表面上獲得均勻的涂層；

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

7、狹縫式涂布：狹縫涂布頭包括，涂布液儲存罐；泵，用于將涂布液儲存罐里 的涂布液通過供給管路壓送到噴嘴處；控制部，用于控制泵及噴嘴的的工作，壓力檢測部，用于檢測管路壓力，當壓力達到預定壓力條件時噴嘴排除涂布液。

7. Slit coating: the slit coating head comprises a coating liquid storage tank; The pump is used to press the coating liquid in the coating liquid storage tank to the nozzle through the supply pipeline; The control part is used to control the operation of the pump and nozzle, and the pressure detection part is used to detect the pipeline pressure. When the pressure reaches the predetermined pressure condition, the nozzle discharges the coating liquid.