Heating System for Disc Screen Rubber Gripping in Cold
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Solution Overview
Problem
Disc screens used for separating recyclable Municipal Solid Waste (MSW) materials become less efficient in cold temperatures due to rubber discs losing gripping ability, leading to reduced separation efficiency of fiber materials from plastic and metal containers.
Innovation Solution
A heating system that maintains the surface temperature of the rubber discs above 40°F (especially between 60-80°F) using forced air heaters and heat reclamation, ensuring effective gripping and transport of fiber materials, while also promoting drying of materials and improving energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rubber discs are used for carrying fiber materials on disc screens, then gripping ability is improved under normal conditions, but gripping ability deteriorates in cold temperatures
Solution Approach 1:
The patent applies parameter changes by heating the rubber discs to maintain their surface temperature above 40°F (optimally 60-80°F). This temperature control modifies the physical state of the rubber material, preventing it from becoming hard and losing grip in cold conditions. The heating system changes the temperature parameter of the rubber discs to maintain reliable gripping ability throughout varying environmental conditions.
2Reliability
If heating system is added to maintain disc temperature, then separation efficiency is improved, but device complexity increases
Solution Approach 1:
The patent uses air as an intermediary medium to transfer heat to the rubber discs. Forced air heaters heat the air, and the heated air circulates around or through the disc assembly, transferring thermal energy to the rubber discs. This intermediary approach avoids direct heating mechanisms that would add more complexity, using instead a relatively simple air circulation and heating system.
Solution Approach 2:
The heating system utilizes pneumatic principles by using forced air circulation to distribute heat. Air blowers or fans move heated air across the disc surfaces, and the pneumatic flow serves as the heat transfer medium. This approach leverages existing pneumatic infrastructure in material handling systems and avoids more complex thermal contact systems.
3Reliability
If heating system is used to maintain rubber disc temperature, then energy consumption increases, but gripping reliability is maintained
Solution Approach 1:
The heating system operates continuously or on a continuous cycle to maintain the rubber discs at the required temperature throughout operation. Rather than intermittent heating, the system provides sustained thermal maintenance, ensuring the rubber remains grippy during the entire material handling process. This continuous action prevents energy-intensive re-heating cycles and maintains consistent performance.
Solution Approach 2:
The system recovers and recirculates heated air that has passed over the discs. Instead of discarding the warmed air, it is recirculated back through the heating system to be reheated and applied again to the discs. This recovery approach reduces the total energy input needed compared to continuously introducing fresh ambient air for heating.
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 heating system significantly enhances the separation efficiency of fiber materials from other MSW materials by maintaining the rubber discs' gripping ability, even in cold conditions, and aids in drying, thus improving the overall performance of the separation system.
Implementation Method 1
A heating system maintains the surface of the rubber discs at a relatively warm temperature
Implementation Method 2
heat from the heating system can be recycled to improve the overall energy efficiency of the separation system
Data Source
AI summary
A separation screen has multiple discs configured to receive a material stream at an in-feed end and move a first group of materials from the material stream up an inclined angle and over a top out-feed end of the separation screen while a second group of materials from the material steam either fall through openings between the discs while being carried up the separation screen or roll off the in-feed end of the separation screen. A heating system heats an outside surface of the discs so that the discs can separate the first group of materials from the material stream during cold environmental temperatures.