1、 Matching coating head
Suitable adhesive viscosity: 50-1000mPa. s
Coating thickness range: Wet glue 2-60 grams per square meter
Characteristics of coating headThe coating accuracy is still acceptable, the operation is simple, and it is easy to quickly switch between different width specifications of the coating substrate. However, the amount of adhesive is easily affected by changes in the viscosity of the adhesive, which requires high flatness of the coating substrate. The disadvantage is that it is prone to local glue leakage. The micro concave coating head on the market (with a diameter of 50mm) is also similar to the coating head, but the precision and diameter of the mesh roller are different. The micro concave coating accuracy is very high, and it can only apply low adhesive, with a particularly large dilution dose
Application: Coating of polyethylene water-based protective film
2、 Gravure direct coating head
Note: The bottom is a rubber groove, the top one is a mesh roller, and the top one is an elastic rubber pressure roller
Suitable adhesive viscosity: 50-1000mPa. s
Coating thickness range: Wet glue 2-60 grams per square meter
Characteristics of coating headHigh coating accuracy, suitable for coating substrates with low adhesive content, can solve the problem of glue leakage in the coating head, 100% adhesive can be applied. The disadvantage is that it is inconvenient to replace substrates with different width specifications, and the machine needs to be stopped to replace the rubber roller
Application: Coating of oil-based protective films such as polyethylene and polypropylene
3、 Scraper type coating head
Note: The one above is a comma scraper
Suitable adhesive viscosity: 1000-300000mPa. s
Coating thickness range: Wet glue>20 grams per square meter
Characteristics of coating headThe coating accuracy is not high, the operation is simple, and the coating substrate includes release paper, PET, BOPP, PE and other materials, which are suitable for coating with a large amount of wet glue. The coating defect is that the glue on both ends of the substrate will be too thick at 1cm, and there will be garbage in the glue, which will cause glue lines to appear
Application areas: Sponge, foam, aluminum foil, fabric base, masking paper, double-sided tape, label production
4、 Upper feed reversal roller coating head
Note: The upper feeding reversal roller coating head has improved accuracy, mainly due to the control of the adhesive amount by the circular measuring roller on top, to avoid direct penetration of the substrate through the No. 3 coating head (uneven thickness of the substrate will affect the uniformity of the No. 3 coating method)
Suitable adhesive viscosity: 1000-300000mPa. s
Coating thickness range: Wet glue 10-300 grams per square meter
Characteristics of coating headThe coating accuracy is higher than that of the No. 3 coating head, and the operation is simple. The coating substrates include release paper, PET, BOPP, PE and other materials, which are suitable for coating with high adhesive viscosity and high control accuracy. Due to the continuous rotation of the measuring roller, there are fewer occurrences of adhesive lines
Disadvantage: For example, some substrates rely on measuring rollers to transfer glue, which may not be able to transfer the glue
Application areas: Sponge, foam, aluminum foil, fabric base, masking paper, double-sided tape, label production
5、 Comma scraper reverse coating head
Suitable adhesive viscosity: 1000-300000mPa. s
Coating thickness range: Wet glue 10-300 grams per square meter
Characteristics of coating headThe coating accuracy is better than that of the No. 3 coating head, and its adhesive amount is controlled by measuring with a comma scraper. Currently, it can automatically control the coating gap, and the accuracy is much better than that of No. 3. The operation is simple, and the coating substrates include PET, BOPP, PE and other materials, which are suitable for coating with high adhesive viscosity and high control accuracy
Application: Coating of solvent based adhesives such as PE, BOPP, PET, etc
6、 Bottom feed reversal coating head
Suitable adhesive viscosity: 500-3000mPa. s
Coating thickness range: Wet glue 10-300 grams per square meter
Characteristics of coating headThe coating accuracy is better than that of the No. 3 coating head, and its adhesive amount is controlled by the measuring roller. Currently, it can automatically control its adhesive gap, and the accuracy is much better than that of No. 3. It is suitable for substrate back adhesive with moderate adhesive viscosity. The disadvantage is that due to the bottom feeding, the adhesive rolls heavily during coating, resulting in a large amount of volatilization. The viscosity of the adhesive coating cannot be too high, and the advantage is that the coated adhesive surface has good flatness
Application: Coating of solvent based adhesives such as PE, BOPP, PET, etc
7、 Lip reversal coating head
Suitable adhesive viscosity: 50-5000mPa. s
Coating thickness range: Wet glue>15 grams/square meter
Characteristics of coating headAdhesive, as it is extruded from a mold, has no solvent evaporation and is suitable for coating on the surface of irregular substrates. It is also suitable for coating adhesives with high evaporation of low boiling point solvents. The viscosity range of adhesive coating is also relatively wide, and the precision of narrow slit coating on the market can even be controlled to 1 micron of dry adhesive,
Application: Coating of solvent based protective films such as PET and BOPP
8、 Lip contact coating head
Suitable adhesive viscosity: 50-5000mPa. s
Coating thickness range: Wet glue>15 grams/square meter
Characteristics of coating headThe only difference from the 7th coating head is that the adhesive is directly applied to the substrate through the coating head, which is suitable for backing the substrate on rough and irregular surfaces. The coating accuracy can also be achieved up to 1 micron through slit extrusion coating
Application: Adhesive backing or coating on fabric, paper, etc
9、 Soaking, extruding, coating and coating head
Suitable adhesive viscosity: 50-200mPa. s
Coating thickness range: Wet glue 1-30 grams per square meter
Characteristics of coating head:The coating operation is simple, and the substrate can be 100% glued. The requirement for substrate fastness is high, and the substrate is prone to breakage after soaking and gluing
Application: Anti penetration coating treatment for paper (textured paper)
10、 Wire rod coating head
Suitable adhesive viscosity: 50-150mPa. s
Coating thickness range: Wet glue 10-60 grams per square meter
Characteristics of coating headThe coating accuracy is acceptable, the operation is simple, and it is easy to quickly switch between different width specifications of the coating substrate. It is suitable for coating adhesive with low viscosity and fast speed (200-300 meters/min) film materials as backing adhesive,
Application: Coating of BOPP tape, coating of PE film
11、 Direct scraping coating head
Suitable adhesive viscosity: 50-100mPa. s
Coating thickness range: Wet glue 2-50 μ m
Characteristics of coating headSuitable for single-sided low viscosity coating with adhesive backing
Application: Coating of release agent on the back of masking paper
12、 Curtain coating head
Requirements for adhesive: Dynamic wetting and static wetting should be very good (poor wetting can cause glue splitting), and the shear resistance should be good (poor mechanical properties can cause adhesive lumps and garbage)
Characteristics of coating headThe adhesive is evenly applied, and the supply of adhesive is fast and stable. It is suitable for high-speed coating, with a general coating speed of 700-1000 meters per minute
Application: Coating of BOPP tape and labels
Application: Coating of oil-based protective films such as polyethylene and polypropylene
3、 Scraper type coating head
Business hotline: 13922900580
Email: tongmeng@tong-meng.com
Address: Factory Building No. 12, 2nd Road, Wentang Ci Xia Industrial Zone, Dongcheng Street, Dongguan City, Guangdong Province
