Tack-Welded Fin Seal Structure for High-Pressure Film Containers
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Solution Overview
Problem
Current fin seals are inadequate for applications involving high internal pressures, corrosive materials, and molding faceplates, as they fail to maintain seal integrity and are prone to breakage during processing and storage.
Innovation Solution
A tack welded fin seal method and system that involves folding and tack welding the edges of a laminated film to create a strong, integrated seal, which includes a faceplate molded from the same composition as the outer layer, ensuring uniformity and preventing delamination, and a gusset seal on the other end, enhancing the container's structural integrity and pressure dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fin seal is used, then the container can be manufactured with simple sealing, but the seal integrity fails under high internal pressures and corrosive materials
Solution Approach 1:
The seal is divided into two distinct portions: a fin seal portion for basic sealing and a tack weld portion for enhanced strength. This segmentation allows each portion to perform its specialized function - the fin seal provides the sealing barrier while the tack weld provides structural reinforcement to withstand high internal pressures and corrosive environments.
Solution Approach 2:
The seal combines two different sealing methods (fin seal and tack weld) into a composite structure. The fin seal portion uses overlapping film layers sealed together, while the tack weld portion uses welding technology to create a stronger bond. This composite approach leverages the advantages of both methods to achieve both sealing and structural integrity.
2Ease of manufacture
If a conventional fin seal is used, then the manufacturing process is simple, but the seal breaks during molding and storage
Solution Approach 1:
The seal structure is segmented into a fin seal portion and a tack weld portion, where the fin seal can be manufactured using conventional simple processes, while the tack weld portion is added subsequently to provide enhanced durability. This segmentation allows the manufacturing process to remain relatively simple while achieving improved reliability.
Solution Approach 2:
The fin seal is formed first as a preliminary sealing structure, and then the tack weld is applied to reinforce it. This preliminary action allows the basic seal to be in place before additional strengthening is applied, ensuring both ease of manufacture and long-term durability during molding and storage.
3Device complexity
If a conventional fin seal is used, then the structure is simple, but it cannot maintain integrity when molding faceplates or handling corrosive materials
Solution Approach 1:
The seal is segmented into functional portions - the fin seal portion maintains structural simplicity for basic sealing, while the tack weld portion provides the additional strength needed for faceplate molding and corrosive material handling. This segmentation adds minimal complexity while significantly improving reliability under stress.
Solution Approach 2:
The enhanced tack weld reinforcement is applied locally at the seal portion that requires additional strength, rather than making the entire structure more complex. This local quality approach maintains simplicity where possible while providing targeted reinforcement where needed for withstanding high internal pressures and corrosive environments.
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 tack welded fin seal increases the strength and longevity of the container's seal, prevents breakage during molding and storage, and ensures uniform pressure distribution, making it suitable for high-pressure and corrosive applications by maintaining the integrity of the fin seal and preventing material leakage.
Implementation Method 1
The weld member may then be lowered to contact the folded first edge and apply heat and pressure to generate the tack weld
Implementation Method 2
The weld member may then be lowered to contact the folded first edge and apply heat and pressure to generate the tack weld
Implementation Method 3
The impulse welder may then be lowered onto the first and second edges to apply heat and form the fin seal
Data Source
AI summary
Systems and methods of a container having a tack welded fin seal. The container may include a film, a tack weld joining a first outer portion of a first edge and a second outer portion of the first edge, and a fin seal joining a first inner portion of the first edge of the film and a second inner portion of a second edge of the film. The container may include a faceplate integrally molded to an outer layer of a first end portion of the film. The faceplate may include substantially the same composition as an outer layer of the first end portion, such that no distinct layers are formed between the faceplate and the film. The tack weld may be formed at a tack welding system, and the fin seal may be formed at a fin sealing system having a mandrel.