Spreader, coating device and coating method

Abstract

The invention provides a spreader, a coating device and a coating method. The spreader provided by the invention is capable of quickly discharging air bubbles inside the spreader to the outside. The spreader comprises a first supply port (31) for supplying the coating solution; a first manifold (11) connected with the first supply port (31); a spit-out seam (22) for spitting out the coating solution; a second manifold (12) connected with the spit-out seam (22); and a connection throttling flow path (21) connected with the first manifold (11) and the second manifold (12). The first manifold (11) is connected with a first discharge port (41) for discharging air bubbles inside the first manifold (11) to the outside. The second manifold (12) is connected with a second supply port (32) for supplying the coating solution and a second discharge port (42) for discharging air bubbles inside the second manifold (12) to the outside.

Description

technical field [0001] The present invention relates to a coater for forming a coating film on a member to be coated by discharging a coating liquid from a discharge slit, a coating device for forming a coating film on a member to be coated by using the coater, And a coating method for forming a coating film on a member to be coated using the coater. Background technique [0002] As an apparatus for coating a coating liquid on a member to be coated such as a glass substrate or a film to form a coating film, a coating device having an applicator having a discharge slit for discharging the coating liquid is known. . The applicator has: a supply port for supplying the coating liquid; a manifold connected to the supply port and widening the coating liquid in the width direction; and a discharge slit for discharging the coating liquid. The coating liquid flowing into the manifold from the supply port expands in the width direction of the manifold, temporarily accumulates in the...

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Problems solved by technology

[0003] Usually, since the supply port is provided at the center of the manifold, the coating liquid flowing into the manifold from the supply port is not completely widened in the width direction of the manifold, and the discharge amount at the center of the discharge slot is compared to The number of edges increases, and as a result, there is a problem that a coating film with a thicker central portion in the width direction is formed.

[0006] In this way, when there are air bubbles in the applicator, the spread of the coating pressure is delayed at the start of coating, so that the film thickness at the beginning of coating becomes thinner, or the bubbles are ejected to the coated part, thereby There are problems such as pinhole-like coating defects in the coating film, or coating defects such as longitudinal streaks on the coating film due to air bubbles mixed into the discharge slots cutting off the flow of the coating liquid.

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