Coating Device Weir Geometry for Bubble Discharge
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Solution Overview
Problem
Existing coating devices fail to prevent air bubbles from being entrained with the coating fluid, leading to application faults such as missing coatings due to air bubbles being trapped in grooves or staying at the bottom of supports, despite previous solutions like elastic blades and weirs not effectively addressing this issue.
Innovation Solution
A coating device configuration with a container, a coating bar immersed in the fluid, and rotatable supports with strategically placed weirs and gaps to prevent air bubbles from being entrained, ensuring the air bubbles are discharged along with the coating fluid, thereby preventing application faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotatable supports are used to reduce friction and prevent coating bar deformation, then the coating bar can rotate smoothly, but air bubbles are entrained at the contact section between the support and coating bar causing application faults
Solution Approach 1:
The patent extracts the harmful air bubbles from the system by providing a dedicated discharge path. The discharge port is positioned to allow air bubbles to escape from the container before the coating bar picks up coating fluid, separating the air removal function from the coating application function.
Solution Approach 2:
The patent introduces an intermediary mechanism (discharge port and baffle structure) between the rotatable support and the coating bar. This intermediary structure manages the air bubbles generated by the rotating support, preventing them from being directly picked up by the coating bar while maintaining the benefits of rotatable support rotation.
2Object-affected harmful factors
If the container is filled with coating fluid to submerge the contact section, then air bubble entrapment is reduced, but fluid level pulsation occurs due to accompanying flow from rotating supports causing air bubbles to be entrained
Solution Approach 1:
The patent creates a controlled flow pattern within the container that mimics a stable fluid environment. The baffle structure and discharge port positioning work together to replicate calm fluid conditions at the coating interface, preventing air bubble entrapment despite the rotating supports creating overall fluid motion.
3Manufacturing precision
If elastic blades or weirs are added to suppress fluid level pulsation, then coating uniformity is improved, but air bubbles are still entrained and cause application faults
Solution Approach 1:
The patent segments the air bubble management function from the fluid level control function. While elastic blades or weirs control the overall fluid level, the separate discharge port and baffle structure specifically target air bubble removal, creating multiple specialized zones within the container that address different aspects of the coating process independently.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents air bubbles from causing application faults by ensuring they are discharged with the coating fluid, maintaining a stable fluid level and preventing pulsation, thus ensuring a uniform coating.
Implementation Method 1
the coating bar is rotated to perform a coating with the coating fluid dipped from the container... the accompanying flow generated by the rotating support... air bubbles in the coating fluid are led to the neighborhood of surface of coating bar by accompanying flow
Implementation Method 2
The accompanying flow generated by the rotating support is dammed with the elastic blade before arriving at the fluid surface to suppress the fluctuation of fluid level
Implementation Method 3
Air bubbles are entrained by accompanying flow of the coating bar to be trapped at tangent point with grooves of coating bar
Data Source
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AI summary
This coating device comprises: a rotatable coating bar (1) that is arranged inside a container (34) having a coating fluid inlet and an upper opening; a plurality of pairs of rotatable supports (2a, 2b) that are arranged intermittently along the longitudinal direction of the coating bar (1), and that support the coating bar (1) from below; and a weir (37) that is located close to the outer periphery of at least the support (2b). The positional relationship between the support (2b) and the weir (37) is determined such that, if a line that connects the shaft center (13b) of the support (2b) and a point (A) which is the end edge of the weir (37) and which is closest to the support (2b) is defined as a straight line (L1) and if a point where the straight line (L1) intersects with the outer periphery of the support (2b) is defined as an intersection point (B), a straight line (L2) that is perpendicular to the straight line (L1) and that passes through the midpoint of a line segment (AB) does not intersect with the coating bar (1). With this construction, it is possible to suppress ripples on the fluid level inside the container caused by an accompanying flow, and also prevent air bubbles from being entrained and accompanied at the coating section.