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、气刀：20世纪30年代气刀涂布机的问世标志着现代纸张涂布工业的诞生。气刀涂布机正是克服了刷式涂布机的上述缺点，迅速被推广，导致了涂布纸产量的急剧增加；

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世纪50年代出现了个刮刀式涂布机专利。此后刮刀涂布机技术得到了快速的发展。根据上料设备、刮刀类型和刮刀安装位置的不同，刮刀涂布头也分为许多种，如硬刃刮刀涂布机、拖刀式刮刀涂布机、软刃刮刀涂布机、喷泉式上料刮刀涂布机、短驻留刮刀涂布机、比尔刮刀涂布机、刮辊式涂布机等；

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、辊式：辊式涂布是用涂布辊向涂布面施以涂料，机内涂布以此类涂布机为主。涂布量可通过计量辊间压力进行调节，压力加强，涂料的通过量减少，涂布量也就减少。辊式涂布机的类型：压榨辊式涂布头、逆转辊式涂布头、传递辊式涂布头、凹版辊式涂布头；

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、喷雾涂布：喷雾涂布技术是一种非接触涂布方式，采用可控高压喷雾技术可对纸或纸板进行单面或双面涂布（施胶）；

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、帘式涂布：多层帘式涂布机只需经过一次涂布操作就能够赋予喷墨打印纸表面三层结构(底层、吸收层

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

和顶层)，并能够在不均匀的纸张表面上获得均匀的涂层；

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

7、狭缝式涂布：狭缝涂布头包括，涂布液储存罐；泵，用于将涂布液储存罐里 的涂布液通过供给管路压送到喷嘴处；控制部，用于控制泵及喷嘴的的工作，压力检测部，用于检测管路压力，当压力达到预定压力条件时喷嘴排除涂布液。

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.