Extruded Polystyrene Processing Plant for Volume Reduction
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Solution Overview
Problem
Existing polystyrene processing devices do not effectively reduce the volume of extruded polystyrene prior to waste management, lacking a comprehensive system for chopping, solvent treatment, freezing, and grinding to minimize environmental impact.
Innovation Solution
A processing plant comprising a chopping unit, solvent bath unit, conveyor unit, freezing unit, and grinding unit that sequentially processes extruded polystyrene into granular material by chopping, eliminating air bubbles, freezing, and grinding to reduce volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If extruded polystyrene is processed using conventional mechanical crushing methods, then the processing simplicity is maintained, but the volume reduction efficiency is insufficient
Solution Approach 1:
The patent applies parameter changes by transforming the physical state of polystyrene through controlled heating and solvent exposure. The polystyrene is heated to specific temperatures and exposed to solvents like dichloromethane or acetone, causing it to transition from a rigid foam structure to a softened state that can be mechanically reduced to sludge, achieving significant volume reduction
Solution Approach 2:
The patent utilizes phase transitions by heating extruded polystyrene to its glass transition temperature range, where the material softens and becomes pliable. This phase change enables the polystyrene to be mechanically processed into sludge form. The process may also involve solvent-induced phase changes that facilitate the transformation from foam to sludge state
2Volume of stationary object
If a solvent-based reduction process is used, then the volume reduction is improved, but the processing time and energy consumption increase
Solution Approach 1:
The patent applies preliminary action by pre-heating the extruded polystyrene before solvent application or mechanical reduction. This pre-heating softens the material in advance, making it more receptive to subsequent processing steps and reducing the overall time required for volume reduction. The polystyrene is heated to the appropriate temperature range before being introduced to the solvent or reduction mechanism
Solution Approach 2:
The patent implements continuity of useful action through a integrated processing system where heated polystyrene continuously moves through solvent exposure and mechanical reduction stages without interruption. The system maintains continuous heating and processing, eliminating idle time between steps and ensuring the polystyrene remains in the softened state throughout the reduction process
3Productivity
If air bubbles are not eliminated from chopped pieces, then the processing simplicity is maintained, but the grinding efficiency and final volume reduction are worsened
Solution Approach 1:
The patent uses solvent as an intermediary medium to eliminate air bubbles from chopped polystyrene pieces. The solvent penetrates the chopped pieces, dissolving trapped air bubbles and allowing them to escape. This intermediary solvent treatment prepares the material for more effective mechanical grinding and further volume reduction in subsequent processing stages
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 system effectively reduces the volume of extruded polystyrene, minimizing space occupation and environmental impact by converting it into granular material suitable for efficient waste management and potential recycling.
Implementation Method 1
a solvent bath unit for submerging the chopped pieces in a solvent for eliminating air bubbles in the chopped pieces
Implementation Method 2
a freezing unit to subsequently freeze the chopped pieces
Data Source
AI summary
An extruded polystyrene processing device for processing extruded polystyrene includes a processing plant which includes a chopping unit for chopping extruded polystyrene into chopped pieces. The chopping unit is connected to a solvent bath unit for submerging the chopped pieces in a solvent for eliminating air bubbles in the chopped pieces. The solvent bath unit is connected to a conveyor unit for rinsing the chopped pieces and the conveyor unit is connected to a freezing unit to subsequently freeze the chopped pieces. The freezing unit is connected to a grinding unit for grinding the frozen chopped pieces into a granular material for subsequent collection and transportation to a waste management facility. In this way the processing plant reduces the total volume of the extruded polystyrene prior to being handled by the waste management facility.