Metal Foam Sandwich Heating Element for Thermoplastic Welding
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Solution Overview
Problem
Existing heating devices for thermoplastic materials, such as manual welding mirrors and butt welding machines, face issues with weight and stability due to solid metal construction, leading to handling difficulties and deformation during use.
Innovation Solution
The heating element is designed as a sandwich body with a metal foam layer covered by solid metal layers on both sides, allowing for the formation of cavities to house heating elements, resulting in a lighter yet stable structure that prevents deformation and enhances operability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heating devices are constructed from solid metal material, then stability and strength are improved, but weight increases leading to handling difficulties
Solution Approach 1:
The heating element uses a metal foam core instead of solid metal, providing a porous structure that reduces weight while maintaining structural integrity. The metal foam provides sufficient mechanical strength and stability for the heating device while significantly lowering the overall weight, making it easier to handle during plasticization operations.
Solution Approach 2:
The heating element is constructed as a composite structure with a metal foam core and solid metal cladding layers. This composite design combines the lightweight properties of metal foam with the surface durability and heat conduction properties of solid metal, achieving both reduced weight and maintained strength/stability.
2Stability of the object's composition
If heating devices are constructed from solid metal material, then structural integrity is improved, but deformation during use occurs due to high weight
Solution Approach 1:
The metal foam core provides sufficient structural integrity to prevent deformation during use while being lightweight enough to avoid the self-weight bending problems associated with solid metal construction. The porous structure maintains rigidity where needed without the excessive weight that causes deformation.
Solution Approach 2:
The composite structure of metal foam core with solid metal cladding provides optimal structural integrity. The metal foam prevents deformation while the solid metal layers provide surface strength and resistance to mechanical damage, together preventing the self-weight bending that occurs with solid metal construction.
3Area of stationary object
If heating element area is increased, then heating efficiency is improved, but weight increases making handling difficult
Solution Approach 1:
The metal foam core enables the heating element to have a larger surface area for improved heating efficiency while maintaining low weight. The porous structure provides high surface-area-to-volume ratio, allowing extensive heating surfaces without proportionally increasing the overall weight of the heating device.
Solution Approach 2:
The composite construction with metal foam core and solid metal cladding allows for larger heating element areas. The metal foam provides the lightweight framework that can support larger dimensions, while the solid metal layers maintain surface integrity, enabling increased heater area without the linear weight increase that would occur with solid metal construction.
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 design significantly reduces weight while maintaining stability, making handling easier and allowing for larger heater areas without increased weight, thereby improving the plasticization process.
Implementation Method 1
in which at least one cavity is provided, in each of which a heating element is inserted
Implementation Method 2
The end faces are then heated on the heating blade
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a heating device for the plasticization of workpieces made of a thermoplastic material, wherein the heating device has a heating element, e.g. in the form of a heating plate (1) or a heating blade (129, 218, 219), in which at least one cavity (5, 6, 7, 8) is provided, in which a heating element is inserted, wherein the heating element (1, 129, 218, 219) is designed as a sandwich body, which has a metal foam layer (2) which is covered on at least one side surface with a solid metal layer (3, 4), wherein the at least one cavity (5, 6, 7, 8) is formed in the metal foam layer (2).