Microwave and Electromagnetic Foaming Mold
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Solution Overview
Problem
Conventional foaming methods face issues with uneven heating and the need for high pressure, which can lead to poor molding quality, especially for crystalline materials and plastics, and existing microwave heating methods require durable molds that are not cost-effective.
Innovation Solution
A foaming method using both microwave and electromagnetic energy with a mold featuring a matched concave-convex structure, allowing for dual heating sources and efficient heat transfer, reducing energy consumption and enabling even heating without the need for a fully plastic mold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external heat source is used for foaming, then heating can be achieved, but uneven heating occurs and high pressure is required
Solution Approach 1:
The patent replaces conventional external heat sources (infrared, electric heating tubes, hot air) with electromagnetic field heating (microwave and electromagnetic energy). This substitution eliminates the need for high pressure mechanical systems while achieving uniform heating through direct molecular excitation of the foaming material.
Solution Approach 2:
The patent utilizes the phase transition properties of the foaming material under electromagnetic heating. The microwave and electromagnetic energy cause rapid molecular vibration and rotation, generating internal heat that promotes phase transition and foaming without requiring external pressure application.
2Temperature
If microwave heating is used, then heating uniformity is improved, but mold durability decreases due to plastic mold requirement
Solution Approach 1:
The mold is segmented into two distinct parts with different material properties: the microwave penetrating part (made of plastic or ceramic for microwave transmission) and the electromagnetic heating part (made of metal for durability and electromagnetic heating). This segmentation allows each part to be optimized for its specific function while working together as a complete system.
Solution Approach 2:
The mold employs composite material construction by combining plastic or ceramic materials (for microwave penetration) with metal materials (for durability and electromagnetic heating). This composite approach resolves the contradiction between microwave transmission requirements and mold durability needs.
3Device complexity
If conventional heating methods are used, then equipment is simple, but energy consumption is high and heating efficiency is poor
Solution Approach 1:
The patent replaces conventional thermal conduction heating systems (infrared heaters, electric heating tubes, hot air systems) with electromagnetic field heating. This substitution dramatically improves energy efficiency by directly exciting molecules within the foaming material, reducing heat loss and eliminating the need for complex thermal management equipment.
4Productivity
If high pressure is applied during foaming, then foaming can be achieved, but crystalline materials break or crack
Solution Approach 1:
The patent replaces mechanical pressure application with electromagnetic field heating for achieving foaming. The microwave and electromagnetic energy provide internal heating that promotes uniform expansion and foaming without imposing external mechanical stress, thereby preventing breakage and cracking of crystalline materials and plastics.
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 method achieves faster and more even heating, reducing energy consumption and processing time, improving the quality of foam bodies and allowing for the use of crystalline plastics without breaking or cracking, while being environmentally friendly and cost-effective.
Implementation Method 1
Microwaves could cause resonance effect among specific molecules in the foaming material for improving the problem of uneven heating from outside to inside caused by aforementioned conductive heating method.
Implementation Method 2
the foaming process came up with a new technique by heating the foaming material utilizing the microwave
Implementation Method 3
the electromagnetic energy is applied to the electromagnetic heating part of the mold
Data Source
AI summary
Present invention is related to a microwave and electromagnetic heated foaming method, mold and foaming material thereof. The microwave and electromagnetic heated foaming method comprises steps of adding a foam material into a mold, simultaneously applying a microwave and electromagnetic energy toward the mold under a normal or low pressure, and the microwave and electromagnetic energy made the foam material into molded foam body. The mold of the present invention has a microwave penetrating part and an electromagnetic heating part. The microwave penetrating part has an extruded bottom that is corresponded to a dented top of the electromagnetic heat penetrating part. By utilizing the microwave and electromagnetic energy, the present invention is about to provide an efficient way for processing the foaming material compared to the conventional infrared or electrical heated tube heating and achieve the foam method that can be executed under normal or low pressure.