Wet Pulping Process for Low Ash Cellulosic Insulation
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Solution Overview
Problem
Conventional processes for producing cellulosic insulation from waste paper materials contaminated with high levels of calcium carbonate and other non-organic materials are inefficient, leading to high ash content, density issues, and dust problems, making it difficult to meet quality standards and economic viability.
Innovation Solution
A wet pulping process using a fiber recovery apparatus to separate cellulosic fibers from contaminants, followed by clarification and recycling of pulping fluids to achieve a low ash content, allowing for the production of cellulosic insulation with reduced inorganic materials and improved thermal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional dry processing is used to produce cellulosic insulation from waste paper, then the process is simple and widely used, but the ash content is high and product quality is poor
Solution Approach 1:
The patent extracts and removes inorganic contaminants (calcium carbonate, clays, fillers) from the cellulosic fiber mixture through wet pulping and clarification processes, separating them from the desired organic fiber content to achieve low ash content insulation product
Solution Approach 2:
The patent changes the processing parameters from conventional dry processing to wet pulping with controlled pH levels (4.5-6.0), temperature (50-200°F), and chemical compositions to enable effective separation of inorganic and organic materials while maintaining fiber quality
2Adaptability or versatility
If waste paper with high calcium carbonate content is used, then material availability is improved, but ash content increases and thermal performance deteriorates
Solution Approach 1:
The patent converts the harmful effect of high calcium carbonate content into a beneficial process parameter by using the inorganic materials as indicators for clarification treatment and recovering them through precipitation processes, transforming a quality defect into a controllable process variable
Solution Approach 2:
The patent introduces pulping fluids with specific chemical compositions (pH 4.5-6.0) as intermediaries that facilitate the separation and selective removal of inorganic contaminants from the cellulosic fibers, enabling processing of high-contaminant waste paper
3Manufacturing precision
If inorganic contaminants are removed through wet pulping, then ash content is reduced, but process complexity increases
Solution Approach 1:
The patent segments the complex wet pulping process into distinct functional zones (pulping zone, separation zone, clarification zone) with specific equipment for each function, making the complex separation process more manageable and efficiently implementable
Solution Approach 2:
The patent recovers and reuses pulping fluids through clarification and filtration systems, reducing waste and chemical consumption while maintaining the effectiveness of the ash removal process, thereby offsetting the increased process complexity
4Manufacturing precision
If fiber separation is improved, then product quality increases, but fiber length decreases
Solution Approach 1:
The patent optimizes pulping fluid pH (4.5-6.0), temperature (50-200°F), and residence time parameters to achieve effective inorganic separation while minimizing mechanical stress on fibers and preserving fiber length
Solution Approach 2:
The patent replaces aggressive mechanical separation methods with chemical and fluid-based separation mechanisms (pH-controlled dissolution, clarification, filtration) that achieve fiber separation without excessive mechanical force that would reduce fiber length
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 process results in cellulosic insulation with a total ash content of less than 10%, improved fiber length, and reduced dust and density issues, enhancing thermal performance and economic viability.
Implementation Method 1
The pulping fluid is selectively heated to a temperature range between about 50° F. to about 200° F. The pulping fluid contains chemicals to enhance the fiber separation process
Implementation Method 2
The clarified pulping fluid is recycled back to the fiber recovery apparatus
Data Source
AI summary
Apparatus and method for recovering organic cellulosic fibers from landfill materials (such as post consumer, municipal and industrial waste materials). The apparatus and method selectively introduces waste materials containing organic cellulosic fibers into a size reduction machine. The pre-cleaned waste materials are conveyed to a tank, drum, or tunnel type fiber recovery apparatus. The waste materials are subjected to mechanical and fluid fiberization for a selected period of time to produce useful products, such as cellulosic insulation with a total ash content equal to or less than 10%, as well animal and fowl bedding products that is substantially devoid of moisture content, among other products.