Elastic Masking Member With Pressure-Release Passage for Hollow Coating
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Solution Overview
Problem
Existing masking members for hollow members during coating processes, such as those described in JP-U No. S59-73370, have complex valve structures to manage pressure, leading to increased complexity and potential issues.
Innovation Solution
A masking member with a masking main body made of elastic material and a passage portion on its outer surface that connects the inside and outside of the hollow member, allowing gas to escape when pressure increases during heating and drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve structure is applied to the masking main body to release pressure, then the pressure of air expanding in the pipe can be released to the outside, but the structure of the masking member becomes complicated
Solution Approach 1:
The passage portion is extracted as a separate functional element from the masking main body. It is formed independently and then integrated with the masking main body, allowing the pressure release function to be achieved without complicating the overall masking member structure. The passage portion can be a simple through-hole or groove that connects the internal cavity to the external environment.
Solution Approach 2:
The masking main body can be designed with porous characteristics or include porous regions that allow gas permeation. This enables pressure release through the masking member itself without requiring complex valve mechanisms, as the porous structure naturally allows controlled passage of expanding air during heating.
2Ease of manufacture
If the masking member has a simple structure, then the masking member is easy to manufacture, but the pressure in the hollow member cannot be effectively released during heating and drying
Solution Approach 1:
The passage portion is merged with the masking main body to form an integrated masking member. The passage portion can be formed simultaneously with the masking main body during molding or as a simple post-processing step, maintaining manufacturing simplicity while ensuring the pressure release function is effectively integrated into the masking member structure.
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 suppresses pressure buildup within the hollow member during coating, preventing the masking member from being dislodged and simplifying the structure while ensuring complete coating coverage.
Implementation Method 1
a masking main body (22) that is formed of an elastic material and that closes an opening portion (52) of a hollow member (50) by being inserted into the opening portion
Implementation Method 2
a passage portion (30) that is formed at the masking main body (22), that opens on an outer peripheral surface of the masking main body, and that connects an outside and an inside of the hollow member by at least a part of an opening at the outer peripheral surface being exposed to the outside of the hollow member in a case in which the masking main body, in a state of closing the opening portion, moves in a direction opposite from an insertion direction
Data Source
AI summary
A masking member includes: a masking main body that is formed of an elastic material and that closes an opening portion of a hollow member by being inserted into the opening portion; and a passage portion that is formed at the masking main body, that opens on an outer peripheral surface of the masking main body, and that connects an outside and an inside of the hollow member by at least a part of an opening at the outer peripheral surface being exposed to the outside of the hollow member in a case in which the masking main body, in a state of closing the opening portion, moves in a direction opposite from an insertion direction.