Cellulose Insulation Dust Reduction via Pre-Treatment
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Solution Overview
Problem
The processing of recycled cardboard cellulose stock into cellulose insulation results in higher dust byproduct and lower conversion rates compared to newsprint, leading to increased loss of input stock and reduced yield.
Innovation Solution
A system and method that involves shredding, grinding, and fiberizing the cellulose material, followed by de-dusting to separate fibers from dust, and then applying liquid fire-retardant chemicals to the de-dusted fibers, which reduces dust generation and chemical usage, and includes a metered supply to multiple fiberizers to minimize dust production and achieve lower bulk density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If recycled cardboard cellulose stock is processed into cellulose insulation using traditional methods, then insulation product is produced, but higher dust byproduct and lower conversion rates occur compared to newsprint
Solution Approach 1:
The patent applies liquid fire-retardant composition to the cellulose material BEFORE the size reduction process, rather than after. This preliminary application allows the chemical to be incorporated into the cellulose structure during processing, reducing dust generation and improving conversion rate from recycled cardboard to finished insulation product
2Reliability
If fire-retardant materials are applied in powder form during physical processing, then flame and smolder resistance is achieved, but chemical usage increases
Solution Approach 1:
The patent changes the physical state parameter of the fire-retardant composition from powder (solid) to liquid form. This parameter change enables more efficient application and incorporation into the cellulose material, reducing the total quantity of chemical needed while maintaining effective fire resistance in the finished insulation product
3Ease of operation
If cellulose material is processed to achieve low bulk density, then easier handling and installation is achieved, but more weight must be processed to achieve same coverage
Solution Approach 1:
The patent creates a controlled processing environment that minimizes dust generation and material loss throughout the processing sequence. By maintaining proper environmental controls and using enclosed processing systems, less material is lost during handling and processing, reducing the total quantity needed to achieve desired coverage
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 approach results in a final cellulose insulation with lower bulk density, improved yield from recycled cardboard, and reduced fire-retardant chemical use, while maintaining effective fire-resistant properties.
Implementation Method 1
A spray booth is configured to receive the cellulose fibers and matrices of cellulose fibers and further configured to spray liquid fire-retardant chemicals onto the cellulose fibers and matrices of cellulose fibers
Implementation Method 2
A dryer is configured to receive the wetted cellulose fibers and to dry the wetted cellulose fiber to produce cellulose insulation
Data Source
AI summary
A system and method for producing cellulose insulation fiberizes the input cellulose material and removes cellulose dust before the resulting cellulose fibers and matrices of cellulose fibers are sprayed with a liquid fire-retardant chemical. A cellulose material metering bin supplies cellulose material to one or more fiberizers. A dryer operates to dry the liquid fire-retardant chemical to produce cellulose insulation.