Photoconductor Coating Flow Path to Prevent Bubble Defects
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Solution Overview
Problem
Existing coating devices face challenges in suppressing bubble defects in the coated film on the outer peripheral surface of a cylindrical body, particularly when the coating liquid flowing down along the cylindrical body falls to the liquid level in a container.
Innovation Solution
A coating device is designed with a coating liquid holding part that allows a cylindrical body to penetrate through both upper and lower openings, and includes a container with a receiving member having an inclined surface above the liquid level, which receives the coating liquid flowing down along the cylindrical body, thereby preventing direct contact with the liquid level and reducing foaming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the coating liquid flows down along the outer peripheral surface of the cylindrical body and falls to the liquid level in the container, then the coating liquid is collected in the container, but bubble defects occur in the coated film due to foaming
Solution Approach 1:
A receiving member with an inclined surface is introduced as an intermediary between the cylindrical body and the liquid level. The coating liquid flows down the inclined surface and is guided to merge with the liquid level in a controlled manner, preventing direct impact and foaming. This intermediary structure resolves the contradiction by enabling liquid collection while eliminating bubble defects.
2Device complexity
If the coating liquid is allowed to flow freely down the cylindrical body into the container, then the coating process is simple, but foaming occurs causing bubble defects
Solution Approach 1:
The receiving member serves as a simple intermediary component that significantly improves coated film quality. The inclined surface structure is straightforward to implement but effectively prevents foaming by controlling the liquid flow path, thus achieving high manufacturing precision with minimal increase in device complexity.
3Productivity
If the coating liquid directly contacts the liquid level upon falling, then the collection process is efficient, but bubbles are generated reducing coating quality
Solution Approach 1:
The receiving member with its inclined surface acts as an intermediary that maintains efficient liquid circulation while preventing bubble generation. The liquid flows smoothly along the inclined surface and merges gradually with the liquid level, preserving circulation efficiency and coating film uniformity simultaneously.
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 coating device effectively suppresses the occurrence of bubble defects in the coated film by preventing foaming through the use of an inclined receiving surface, resulting in a more uniform and defect-free coating compared to traditional methods where the coating liquid falls directly to the liquid level.
Implementation Method 1
suppresses the occurrence of bubble defects in the coated film by preventing foaming through the use of an inclined receiving surface
Data Source
AI summary
A coating device includes: a coating liquid holding part that is provided with an upper opening portion and a lower opening portion and holds a coating liquid, and in which a cylindrical body penetrates the upper opening portion and the lower opening portion, and the cylindrical body is relatively moved to an upper side in an up-down direction, so that the coating liquid is applied to an outer peripheral surface of the cylindrical body; a container that accommodates the coating liquid that flows down; a circulation part that circulates the coating liquid in the container to the coating liquid holding part; and a receiving member that is disposed above a liquid level of the coating liquid in the container and receives the coating liquid flowing downward along the outer peripheral surface of the cylindrical body with an inclined surface.