Slit type coating machine

Abstract

The invention discloses a slit type coating machine. A coating machine head tightly abuts against a coating roller and is fixed to a rack, an upper cover and a liquid storage cavity are movably connected, the top surface of the upper cover is level and smooth, and the two ends of the upper cover are provided with bubble exhausting valves. Bubble exhausting valve bodies are provided with air exhausting pipes, the air exhausting pipes penetrate through holes machined in the upper cover to fall into the liquid storage cavity, a lock catch is mounted on the obverse side of the upper cover, and the liquid storage cavity and the upper cover are matched in shape and buckled together. A liquid inlet is formed in the center of the obverse side of the liquid storage cavity, a negative pressure cavity is formed between the extrusion coating machine head and the coating roller and supported by a supporting frame, and the bottom of the negative pressure cavity is connected with a negative pressure pipe communicating with a negative pressure buffer tank. The negative pressure buffer tank is connected with a pipeline communicating with the negative pressure tank, a pneumatic ball valve is mounted in the middle of the pipeline, the end, close to the negative pressure tank, of the pipeline communicates with the other pipeline, and an active adjusting valve is mounted on the other pipeline. The tail end of the other pipeline is provided with an adjusting valve switch, and the other side face of the negative pressure tank is provided with a pipeline connected with a fan.

Description

technical field [0001] The invention relates to a coating machine head and a closed negative pressure working chamber, which is especially suitable for installation and use on a slit coating machine. Background technique [0002] The existing coating machine head includes a liquid storage chamber and an upper cover. The shape of the liquid storage chamber is inverted trapezoidal or semicircular. The coating liquid flows quickly from the liquid outlet and is coated on the PET substrate above the coating roller. , this flow mode is not the best implementation mode, and its disadvantage is that due to the structural defects of the cavity, the coating is uneven, and the thickness of the produced coating is uneven, which affects the quality of the product. Furthermore, the existing coating The half-section of the transverse chamber of the machine head is straight and has edges and corners. The liquid storage chamber of the machine head is covered with a cover and connected by bol...

AI Technical Summary

Problems solved by technology

[0002] The existing coating machine head includes a liquid storage chamber and an upper cover. The shape of the liquid storage chamber is inverted trapezoidal or semicircular. The coating liquid flows quickly from the liquid outlet and is coated on the PET substrate above the coating roller. , this flow mode is not the best implementation mode, and its disadvantage is that due to the structural defects of the cavity, the coating is uneven, and the thickness of the produced coating is uneven, which affects the quality of the product. Moreover, the existing coating The half-section of the transverse cavity of the machine head is straight and has edges and corners. The liquid storage chamber of the machine head is covered with a cover and connected by bolts. If the liquid storage chamber needs to be cleaned, the bolts need to be removed, and the Removing the liquid chamber is cumbersome, low efficiency, easy to scratch the operator with the angular machine head when shifting, and easily deforms the coating head when it is disassembled and lifted up and down.

When the existing coated mixed solution enters the coating roller from the liquid outlet of the coating machine head, a meniscus will be formed when the mixed solution is coated on the coating roller. If there is no negative pressure device, the meniscus will not be stable in time, basically When the material runs at a linear speed, the wind enters the coating gap, causing a large number of air bubbles, and the coated product is scrapped. Some dust that cannot be seen by the naked eye will adhere to the substrate running at a linear speed, which will directly affect the quality of the product.

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