Holding Sealer Anisotropic Protective Sheet Exhaust Gas Leakage
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Solution Overview
Problem
Existing holding sealers with flexible protective sheets face issues with shearing forces during press-fitting, leading to positional differences and wrinkles, which can cause gaps and leakage of unprocessed exhaust gas in exhaust gas processing devices.
Innovation Solution
A holding sealer with a mat base member made of inorganic fibers and a protective sheet having different directional extendability, where the protective sheet's maximum extendability direction is angled relative to the sealer's long length direction, reducing positional differences and wrinkles during press-fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible protective sheet is placed on the holding sealer to prevent cracks during winding, then crack occurrence is reduced, but shearing force during press-fitting increases causing positional differences and wrinkles
Solution Approach 1:
The protective sheet's physical parameters are optimized by selecting materials with specific elongation properties (5-20% in the long length direction, 10-30% in the width direction) and controlling thickness (0.01-0.1mm). This parameter optimization allows the sheet to provide crack prevention while reducing excessive shearing force during press-fitting, thereby preventing positional differences and wrinkles.
Solution Approach 2:
The holding sealer is constructed as a composite structure combining the base holding sealer material with a protective sheet layer. This composite structure integrates the crack-resistant properties of the protective sheet with the sealing properties of the holding sealer, while the sheet's controlled elasticity balances protection during winding with precision during press-fitting.
2Strength
If the protective sheet has high flexibility to accommodate winding tension, then crack resistance improves, but wrinkle formation increases during press-fitting
Solution Approach 1:
The protective sheet's mechanical parameters are precisely controlled with elongation in the range of 5-20% in the long length direction and 10-30% in the width direction, and thickness of 0.01-0.1mm. This parameter control provides sufficient flexibility to resist cracks during winding while limiting excessive deformation that causes wrinkles during press-fitting.
Solution Approach 2:
The protective sheet exhibits different mechanical properties in different directions (anisotropic properties), with elongation of 5-20% in the long length direction and 10-30% in the width direction. This directional quality difference allows the sheet to accommodate winding tension in the circumferential direction while maintaining surface flatness during press-fitting.
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 configuration effectively restricts the formation of gaps and leaks by moderating deformation, ensuring better sealing and reducing exhaust gas leakage in exhaust gas processing devices.
Implementation Method 1
the protective sheet has within the surface of the protective sheet a direction with an extendability that differs from the extendability in another direction within the surface of the protective sheet
Data Source
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AI summary
The object of the present invention is to provide a holding sealer (24) which can restrict the leakage of the non-processed exhaust gas, and also provide an exhaust gas processing device using such a holding sealer. There is provided a holding sealer (24) comprising a mat base member (26) including inorganic fibers and a protective sheet (28) provided on a surface of the mat base member (26), in which the holding sealer (24) is formed as a rectangular shape, wherein the protective sheet (28) is extended in a different direction inside the surface of the protective sheet (28), and the protective sheet (28) is placed on the surface of the mat base member (26) such that a direction showing the maximum extension of the protective sheet (28) is arranged at an angle except zero to a long length direction of the holding sealer (24).