Low-Speed High-Torque Grinder for Cellulosic Fuel
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Solution Overview
Problem
Existing methods for processing thermoplastic resin and cellulosic fiber waste into combustible materials face challenges such as difficulty in maintaining continuous feedstock processing and a high risk of fire, which limits the production of high heat output products.
Innovation Solution
A method utilizing low-speed, high-torque equipment for continuous processing of feedstock, including the use of specific thermoplastic materials like polypropylene and polyethylene, and a controlled process that includes grinding, cubing, and monitoring to minimize fire risks and optimize heat output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional shredder devices are used to process highly cross-linked thermoplastic materials, then the materials can be processed, but the shredder quickly becomes bound-up and ceases operating
Solution Approach 1:
The patent changes the operational parameters of the processing equipment by using low-speed, high-torque equipment instead of conventional high-speed shredders. This parameter change allows continuous processing of highly cross-linked thermoplastic materials without the equipment becoming bound-up, thereby maintaining both processability and productivity.
2Ease of manufacture
If conventional processing methods are used on combustible materials, then processing can occur, but the friction creates an extreme fire hazard
Solution Approach 1:
The patent changes the speed parameter of the processing equipment to low-speed operation. This reduces friction and heat generation during processing, thereby eliminating the fire hazard while maintaining the ability to process combustible materials. The low-speed operation prevents excessive heat buildup that would otherwise cause ignition.
3Reliability
If cellulosic fibers are used as fuel source, then environmental benefits are achieved, but the heating value is relatively low compared to conventional fuels
Solution Approach 1:
The patent creates a composite fuel product by combining cellulosic fibers with thermoplastic materials. This composite structure allows the fuel to maintain environmental sustainability while achieving higher heating values (10,000-13,500 BTU/lb) through the energy contribution of the thermoplastic component, thereby resolving the contradiction between environmental benefits and energy output.
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 enables the production of combustible products with high heat output, exceeding 10,000 BTU per pound, while reducing the risk of fire and ensuring safe operation, as demonstrated by successful burning in various furnaces with average heat of combustion between 12,400 and 13,500 BTU per pound.
Implementation Method 1
grinding
Implementation Method 2
low-speed, high-torque equipment for continuous processing
Implementation Method 3
controlled process that includes grinding, cubing
Implementation Method 4
use of specific thermoplastic materials like polypropylene and polyethylene
Implementation Method 5
successful burning in various furnaces with average heat of combustion between 12,400 and 13,500 BTU per pound
Data Source
AI summary
This present invention is for an improved method of recycling waste materials consisting substantially of cellulosic fiber and thermoplastic resin to make combustible products useful as industrial fuel with high heat output. The preferred method utilizes a low-speed and high-torque grinder to facilitate the continuous processing of feedstock. One advantage of the present invention over the prior art is the ability to continuously process feedstock while reducing the risk of fire.