Variable Temperature Seal Element for Non-Uniform Heat Distribution
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Solution Overview
Problem
Standard heat sealing elements with uniform cross-sectional areas are inadequate for complex applications involving non-uniform materials, as they require varying heat levels and shapes, leading to inefficient energy use, potential deformation of thinner components, and unreliable seals due to inadequate heat distribution and bending-induced strain.
Innovation Solution
A resistive heat sealing element with a tailored profile, featuring different electrical resistances and cross-sectional areas along its length, allowing for targeted heat delivery to specific areas, machined to precise dimensions to ensure sharp transitions and conform to complex shapes without bending, which enables controlled heat application to regions with varying mass and heat-sinking properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standard heating element with uniform cross-sectional area is used, then the heating element can be easily manufactured and operated, but it cannot provide varying heat levels to different areas of complex materials, resulting in unreliable seals and potential deformation
Solution Approach 1:
The heating element incorporates varying cross-sectional areas along its length, creating different electrical resistances in different sections. This allows each section to generate different heat levels when the same current flows through, enabling tailored heat application to match the specific thermal requirements of different material areas being sealed.
Solution Approach 2:
The patent changes the physical parameter of the heating element by varying its cross-sectional area along its length. This geometric parameter change directly affects the electrical resistance distribution, which in turn controls the heat generation distribution, allowing the heating element to adapt to complex sealing requirements.
2Reliability
If the temperature is increased to ensure sealing in areas of greater mass, then sealing reliability improves, but the thinner regions experience excessive heat causing deformation and material degradation
Solution Approach 1:
The heating element is designed with non-uniform cross-sectional areas that create localized variations in heat generation. Sections with larger cross-sectional areas generate more heat for sealing thicker materials, while sections with smaller cross-sectional areas generate less heat for thinner materials, preventing deformation and degradation.
Solution Approach 2:
Instead of applying uniform heat throughout the entire heating element, the patent applies heat selectively and proportionally to different sections based on their specific thermal requirements, avoiding excessive heat application to areas that don't need it.
3Reliability
If the heating time is increased to ensure adequate heating of thicker regions, then sealing completeness improves, but production speed decreases and energy consumption increases
Solution Approach 1:
The patent changes the electrical resistance parameter along the length of the heating element by varying its cross-sectional area. This allows different sections to generate different amounts of heat simultaneously, achieving complete sealing of all regions in the same time period without extending the overall heating cycle.
Solution Approach 2:
The heating element maintains continuous and optimized heat generation across all sections simultaneously, with each section contributing appropriately to the sealing process. This eliminates the need for extended heating time that would be required if uniform heating were applied, thereby maintaining high production speed.
4Temperature
If the temperature is increased to compensate for heat loss in thicker regions, then heat penetration improves, but energy efficiency decreases due to wasted heat in thinner regions
Solution Approach 1:
The heating element is designed with varying cross-sectional areas that create localized heat generation zones. Each section generates heat proportional to its resistance, which is tailored to the thermal needs of the corresponding material section, maximizing heat penetration where needed while minimizing energy waste elsewhere.
Solution Approach 2:
By changing the cross-sectional area parameter along the heating element's length, the patent creates a resistance gradient that optimizes heat generation distribution. This ensures efficient energy utilization by matching heat input to the actual thermal requirements of different material regions.
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 solution allows for precise heat control, optimizing energy use by providing higher heat to areas of greater mass while minimizing heat to thinner regions, reducing the risk of deformation and improving seal reliability and consistency in complex sealing applications.
Implementation Method 1
a first portion of the heating element exhibits a first electrical resistance; a second portion of the heating element exhibits a second electrical resistance that is different from the first electrical resistance; and, wherein when electrical current is passed through the heating element, the first portion and the second portion generate different heat levels
Data Source
AI summary
Devices and methods for fusing materials using a heating element, where the overall mass to be sealed varies along the length of the seal. According to the invention, the heating element has a different profile in different areas. According to some aspects, the thickness and/or cross section of the heating element is different in different areas so that when a current is passed through the heating element, each area heats to a different degree. In some aspects, the heating element is shaped to conform to the shape of the parts to be fused together. The transition between areas of different thickness or cross-sectional area, or between areas of different shape may be sharply defined. This abrupt transition may be created by machining the heating element to a finished shape rather than bending flat stock to shape.