Elastomeric Seal Manufacturing with Dual-Hardness Layers
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Solution Overview
Problem
Traditional methods for sealing pipelines, such as using bentonite or 'mud-plugs', often result in the release of explosive or noxious gases due to sloughing, drying, and improper installation, posing safety risks during maintenance or welding tasks.
Innovation Solution
A method involving a mold with a molding cavity and a ring-shaped separator is used to create an elastomeric seal by pouring elastomers of different hardnesses, allowing them to merge and set, forming a sealing element with multiple ridges for enhanced vapor containment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mud-plugs are used to seal pipelines, then the sealing function is provided, but explosive or noxious gases are released due to sloughing, drying, and improper installation
Solution Approach 1:
The patent applies composite materials by combining two elastomers with different hardness values (first elastomer with first hardness, second elastomer with second hardness) to create a multi-layered sealing element. This composite structure provides both structural integrity and effective sealing, eliminating the need for traditional mud-plugs that cause gas release.
Solution Approach 2:
The patent implements local quality by creating regions with different material properties within the sealing element. The first elastomer and second elastomer have different hardness values, allowing specific zones to perform different functions - the harder elastomer providing structural support while the softer elastomer provides sealing contact, thus achieving reliable sealing without harmful effects.
2Ease of manufacture
If a single elastomer is used in the seal, then the manufacturing process is simple, but the seal cannot provide both structural integrity and effective sealing contact
Solution Approach 1:
The patent applies segmentation by dividing the sealing element into distinct regions filled with different elastomers. The mold is segmented into a first region for the first elastomer and a second region for the second elastomer, allowing each material to perform its specific function while maintaining manufacturing feasibility through a systematic pouring process.
Solution Approach 2:
The patent uses composite materials to achieve both structural integrity and effective sealing contact. By combining elastomers of different hardness values in a controlled manufacturing process, the patent creates a seal that maintains structural strength while providing compliant sealing surfaces, thus improving reliability without excessive manufacturing complexity.
3Reliability
If elastomers of different hardnesses are combined in the seal, then both structural integrity and sealing contact are achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent uses a physical barrier or separator within the mold to mediate between the two elastomers during the pouring process. This intermediary structure allows the first and second elastomers to be poured sequentially into their respective regions without mixing, simplifying the manufacturing process while maintaining the benefits of composite materials with different hardness values.
Solution Approach 2:
The patent applies preliminary action by preparing the mold with specific structures (such as barriers or separators) before pouring the elastomers. This preliminary setup ensures that when the first and second elastomers are poured, they automatically segregate into their intended regions, reducing the complexity of the overall manufacturing process while achieving reliable sealing effectiveness.
Data Source
AI summary
There is provided a method of manufacturing a sealing element, the method having the steps of providing a mold comprising a molding cavity in the shape of the sealing element, the mold having inner walls and outer walls, placing a ring-shaped separator concentrically in the mold, pouring a first elastomer having a first hardness into a center of the separator, and pouring a second elastomer having a second hardness that is different from the first hardness between the separator and the inner walls of the mold.