Can Inner Surface Coating Method Using Gravity Flow
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Solution Overview
Problem
The existing can inner surface coating methods require costly equipment to maintain the rotation of cylindrical bodies for uniform coating film formation, especially for the barrel part, which increases equipment costs and complexity.
Innovation Solution
A method involving a two-step coating process where a first coating material with high non-volatile content is applied to the opening part and a second coating material with lower non-volatile content is applied to the barrel part, followed by a vaporizing step where the cylindrical body is changed from horizontal to vertical, allowing the second coating material to drip and extend to the bottom part, while the first coating material maintains thickness on the opening part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the bottomed cylindrical body is kept rotating around its central axis during the vaporization of volatile components of the second coating material, then a uniform coating film can be formed on the inner surface, but the equipment cost increases due to additional rotation devices
Solution Approach 1:
Instead of rotating the cylindrical body to achieve uniform coating, the invention inverts the approach by changing the body's orientation from horizontal to vertical position. This allows the coating material to distribute uniformly through gravitational flow along the inner surface, eliminating the need for rotation devices during the vaporization phase.
Solution Approach 2:
The invention changes the physical parameter of the cylindrical body's orientation (from horizontal to vertical) to control the flow and distribution of coating material. This parameter change enables uniform coating formation without mechanical rotation, reducing equipment complexity while maintaining coating quality.
2Strength
If the first coating material is applied to the opening part while the cylindrical body is rotated, then machining resistance is improved, but the process becomes more complex and costly
Solution Approach 1:
The invention applies different coating materials with specific properties to different parts of the cylindrical body - the first coating material with high non-volatile content is applied to the opening part to provide machining resistance, while the second coating material is applied to the barrel part. This local differentiation achieves the desired strength without requiring complex rotation equipment for the entire body.
Solution Approach 2:
The coating process is segmented into two distinct steps: first coating the opening part with high non-volatile content material for machining resistance, then coating the barrel part with lower non-volatile content material. This segmentation allows each part to receive optimized coating without requiring continuous rotation of the entire body.
3Manufacturing precision
If the second coating material with lower non-volatile content is sprayed onto the barrel part, then a thin and uniform coating film is formed, but the coating may not reach the bottom part effectively without rotation
Solution Approach 1:
The invention inverts the traditional horizontal coating approach by changing to vertical positioning. This allows the second coating material to flow downward under gravity, ensuring effective coverage of the bottom part while maintaining thin and uniform film thickness on the barrel part through controlled spraying.
Solution Approach 2:
Gravity acts as an intermediary force that facilitates the distribution of the second coating material from the barrel part to the bottom part. By positioning the body vertically, gravity naturally guides the coating material flow, eliminating the need for rotation to achieve proper distribution.
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
This method allows for a uniform and thin coating film on the entire inner surface while strengthening the machining resistance of the opening part at a lower cost, effectively extending the coating to complex-shaped areas without the need for continuous rotation.
Implementation Method 1
before vaporization of volatile components of the second coating material sprayed onto the inner surface area of the barrel part
Implementation Method 2
the position of the bottomed cylindrical body is changed from the horizontal position to a vertical position, then the volatile components of the second coating material are made to vaporize
Data Source
AI summary
A coating method includes a first step for spraying, onto an inner area of an opening part of a cylindrical body having a bottom and arranged horizontally, a first coating material of synthetic resin containing non-volatile components while rotating the cylindrical body around a central axis thereof. After the first step, a second step is performed for spraying, onto an inner area of a barrel part of the cylindrical body, a second coating material of synthetic resin containing a lower proportion of non-volatile components than that of the first coating material while continuing to rotate the cylindrical body. After the second step is performed and before the volatile components of the second coating material vaporizes, a third step is performed in which the rotation of the cylindrical body is stopped, the cylindrical body is placed vertically, and the volatile components of the second coating material are vaporized.