Glass Fiber Molded Parts With Microwave-Cured Inorganic Binders
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Solution Overview
Problem
Existing molded parts using organic binders for acoustic and insulating applications face issues with low melting or boiling points, leading to ineffective binding at high temperatures and environmental pollution due to combustion emissions, requiring complex processing and organic binder decomposition.
Innovation Solution
A method using inorganic binders cured by radio frequency or microwave radiation at low temperatures below 120°C, allowing the production of glass fiber and mineral fiber molded parts with improved mechanical properties and reduced emissions, using tools permeable to electromagnetic radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic binders are used for molding glass fiber and mineral fiber parts, then the parts can be formed with good initial binding properties, but the binders decompose at high temperatures above 180°C causing emissions and losing binding effectiveness
Solution Approach 1:
The patent changes the chemical composition parameter of the binder from organic to inorganic (water glass-based), which fundamentally alters the thermal stability and combustion characteristics. This parameter change eliminates the decomposition and emission problems inherent to organic binders while maintaining binding effectiveness through the inorganic binder's ability to set and harden at elevated temperatures without combustion.
Solution Approach 2:
The patent converts the typically harmful high-temperature exposure that causes organic binder decomposition into a beneficial curing process for inorganic binders. The heat that would normally degrade organic materials is instead used to accelerate the setting and hardening of water glass-based inorganic binders, transforming a harmful thermal effect into a useful curing mechanism.
2Strength
If conventional thermal curing methods are used to cure inorganic binders, then the binder can be hardened, but high temperatures above 300°C are required causing energy consumption and potential fiber damage
Solution Approach 1:
The patent replaces the thermal field (heat-based curing) with an electromagnetic field (microwave radiation). Instead of using conventional thermal conduction and convection to cure the inorganic binder, microwave energy directly excites the water molecules in the water glass binder, causing rapid heating and curing at lower overall temperatures and with more targeted energy delivery, thereby reducing total energy consumption and preventing fiber damage.
Solution Approach 2:
The patent utilizes the phase transition properties of water in the water glass binder under microwave irradiation. The microwave energy causes rapid heating and phase change of the water component, which drives the setting and hardening reaction of the inorganic binder at lower temperatures than conventional methods, reducing energy consumption while achieving the desired binder hardness.
3Strength
If high temperatures are applied during curing to harden the binder, then the binder achieves desired mechanical properties, but the tool and fibers are exposed to excessive heat causing deformation or degradation
Solution Approach 1:
The patent replaces conventional thermal conduction heating with direct microwave electromagnetic heating. The microwave radiation penetrates the molded part and heats the water glass binder internally through dielectric heating, rather than heating the tool and then conducting heat into the material. This allows the binder to cure and harden while the tool remains at lower temperatures, preventing tool deformation and fiber degradation.
Solution Approach 2:
The water molecules in the water glass binder act as an intermediary that absorbs microwave energy and converts it to thermal energy locally within the binder material. This intermediary mechanism allows the binder to achieve the necessary temperature for hardening without requiring the entire system (tool, fibers, environment) to reach high temperatures, thus protecting the tool and fibers from thermal damage.
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 method achieves improved mechanical properties, such as tensile and compressive strength, with reduced energy consumption and emissions, while maintaining acoustic and insulating performance, avoiding decomposition of fibers and tool heating.
Implementation Method 1
The inorganic binder is cured by means of electromagnetic radiation to form the molded part
Implementation Method 2
low-temperature curing of the inorganic binder at below 120°C using radio frequency radiation or microwave radiation
Implementation Method 3
low-temperature curing of the inorganic binder at below 120°C using radio frequency radiation or microwave radiation
Implementation Method 4
the tool is designed to be permeable to radio frequency or microwave radiation for curing
Data Source
Figure 1
AI summary
The invention relates to a method for producing a molded part from glass fiber and/or mineral fiber material with an inorganic binder. The inorganic binder is cured using electromagnetic radiation in order to form the molded part. The tool is designed to be at least partly permeable for the electromagnetic radiation for curing purposes, and the inorganic binder is a binder which can be cured by electromagnetic radiation. The invention further relates to a molded part which can be obtained in the aforementioned manner. Finally, the invention relates to a manufacturing unit for producing a molded part from glass fiber and/or mineral fiber material and an inorganic binder. The manufacturing unit comprises a device for providing a tool for forming the molded part, a device for introducing the glass fiber and/or mineral fiber material and the inorganic binder into the tool, a device for generating electromagnetic radiation to cure the inorganic binder in order to form a molded part, and optionally a device for removing the molded part from the tool.