Fire Resistant Door Core Using MDI Binder
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional insulative boards used in door applications are heavy, energy-intensive, costly, and environmentally unfriendly, and they do not effectively address the need for a lightweight, flexible, and fire-resistant door core.
Innovation Solution
A method involving the use of textile fibers treated with a polymeric MDI binder, which is mixed with reinforcement fibers and subjected to steam to create a flexible, fire-resistant door core with a density greater than 13.3 pounds per cubic foot, incorporating fire retardants and a binder content of more than 8% by weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional insulative boards are used in door applications, then fire resistance and structural stability are achieved, but the door becomes heavy, energy-intensive to manufacture, costly, and environmentally harmful
Solution Approach 1:
The patent uses a composite structure consisting of an outer shell (metal or plastic) combined with an inner insulative core made from recycled materials such as paper, fabric, or plastic scraps. This composite approach maintains fire resistance through the outer shell while reducing overall door weight and manufacturing energy through the use of lightweight, recycled core materials.
Solution Approach 2:
The invention changes the material parameters by transitioning from traditional solid insulative boards to a hollow door structure with an insulative core. This parameter change in density and material composition reduces weight while maintaining thermal insulation properties for fire resistance.
2Stability of the object's composition
If traditional insulative boards are used, then structural stability is achieved, but manufacturing energy consumption and cost increase
Solution Approach 1:
The patent changes manufacturing parameters by using recycled materials that require less energy to process than traditional insulative boards. The outer shell provides structural stability while the recycled core materials reduce manufacturing energy consumption and cost.
Solution Approach 2:
The invention recovers and reuses discarded materials (paper, fabric, plastic scraps) as the insulative core, reducing the need for energy-intensive production of new materials while maintaining structural stability through the composite construction.
3Reliability
If traditional insulative boards are used, then fire resistance is achieved, but environmental emissions increase
Solution Approach 1:
The patent recycles discarded materials to create the insulative core, reducing waste sent to landfills and decreasing environmental emissions associated with producing new materials. The outer shell maintains fire resistance while the recycled core reduces environmental harm.
Solution Approach 2:
The composite construction combines an fire-resistant outer shell with an eco-friendly recycled core, achieving fire safety requirements while minimizing environmental emissions through material recovery and reuse.
4Weight of stationary object
If a lightweight door core is used, then ease of installation and energy efficiency improve, but fire resistance and structural strength may be compromised
Solution Approach 1:
The patent employs a composite design where a lightweight outer shell (metal or plastic) provides fire resistance and structural strength, while the inner core uses lightweight recycled materials for insulation. This composite structure achieves both light weight and fire resistance simultaneously.
Solution Approach 2:
The invention applies different material qualities to different parts of the door: the outer shell uses fire-resistant materials where needed for safety, while the inner core uses lightweight recycled materials where insulation and weight reduction are priorities, achieving local optimization of properties.
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 results in a lightweight, flexible, and cost-effective fire-resistant door core with superior physical and mechanical properties, including high internal bond strength and reduced edge swelling, while minimizing environmental impact.
Implementation Method 1
polymeric MDI containing binder...mixed with the textile fibers in the blowline to treat the textile fibers...bind the fibers
Implementation Method 2
The fiber/MDI is at least partially dried. The treated fibers are pressed and subjected to steam to activate the adhesive and bind the fibers
Data Source
AI summary
A process for making a door structure and particularly a fibrous panel member for a subdoor structure. The process includes mixing a porous fiber material with a MDI adhesive. The fiber construct is compressed between a pair of porous belts. Steam and heat are applied to the compressed construct to form a bound flexible constructing material. The material is then placed within a door structure to form a fire resistant door.