Split Bus Assembly for Uniform Heat-Seal Band Heating
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Solution Overview
Problem
Achieving uniform heat distribution in heat-sealing processes, particularly with closed-contour heat-seal bands, is challenging due to variations in energy transfer at tab/band junctions and complex assemblages of insulative and conductive materials in heat-seal tools, leading to non-uniform heating.
Innovation Solution
A split bus assembly with two electrically insulated bus bars and an opposing temperature system for active heating and cooling, along with a liquid-cooled electrical bus assembly, ensures uniform energy delivery and temperature control across the heat-seal band, using temperature-controlled fluids and conductive materials with selective exposure for efficient energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If closed-contour heat-seal bands with tab/band junctions are used, then electrical current can be transmitted into and out of the bands, but unbalanced energy transfer and nonuniform heating occur at the tab/band junction
Solution Approach 1:
The patent applies local quality by making the bus bar assembly electrically conductive where needed (at tab/band junctions) while using electrically insulative materials for the majority of the bus bar structure. This selective conductivity ensures uniform heat distribution across the heat-seal band surface while maintaining effective electrical current transmission at critical junction points, resolving the contradiction between energy transmission and heating uniformity.
2Adaptability or versatility
If complex assemblages of insulative and conductive materials are used in heat-seal tools, then multiple joints at backing surface can be created, but non-uniformity of surfaces and material characteristics lead to uneven energy transfer
Solution Approach 1:
The patent applies homogeneity by using a substantially planar outer surface for the bus bar assembly that provides uniform material characteristics across the entire heat-seal band contact area. This homogeneous surface design, combined with the integrated bus bar structure, ensures even energy transfer while maintaining the capability to create multiple joints through the extended planar configuration.
3Temperature
If passive cooling is used to reduce heat seal band temperature, then the workpiece components can be held under pressure, but the heat distribution uniformity is compromised
Solution Approach 1:
The patent applies pneumatics and hydraulics by incorporating a fluid delivery system with nozzles that spray cooling fluid onto the heat-seal band during the cooling phase. This hydraulic cooling method provides uniform temperature reduction across the entire band surface while maintaining pressure on the workpiece, preserving heat distribution uniformity that would be difficult to achieve with passive cooling alone.
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 provides enhanced control over heat distribution, ensuring uniform temperature and energy delivery across the heat-seal band, improving the quality of welds or heat-seals by balancing heat and cooling loads dynamically.
Implementation Method 1
liquid cooled electrical bus assembly
Implementation Method 2
liquid cooled electrical bus assembly
Implementation Method 3
temperature-controlled fluids
Data Source
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AI summary
A split bus assembly is provided for a heat-sealing machine. The split bus assembly includes a clamp with first and second clamp segments that abut each other in face-to-face engagement. The engaging surfaces or inner walls of the clamp segments may be coated with a nonconductive material so that the clamp segments are electrically insulated with respect to each other. A tab terminal may be defined at each inner wall, constituting a zone of exposed conductive material which is configured to engage a conductive tab of a heat-seal band during use. Biasing members such as a silicone spring may be arranged in the tool to facilitate ejection of the heat-seal band during a removal procedure. The tool may be cooled by way of cooling fluid that flows through passages in the bus bars.