Waste Plastic Flake Friction Cleaning With Mist Cooling
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Solution Overview
Problem
Existing physical methods for removing foreign substances from waste plastic surfaces generate excessive frictional heat, necessitating repeated cooling and are inefficient due to open structures that allow external air intake and dust discharge.
Innovation Solution
A closed apparatus design with a rotating shaft and moisture injection system to supply mist-like moisture, controlling frictional heat and enhancing cooling through latent heat of evaporation, while minimizing air pressure and optimizing friction performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If friction processing is performed repeatedly to remove foreign substances from waste plastic surfaces, then foreign substance removal efficiency is improved, but frictional heat accumulates and raw materials must be cooled between cycles
Solution Approach 1:
The patent converts the harmful frictional heat into a beneficial cooling mechanism by introducing moisture that evaporates and absorbs heat. The moisture injection system transforms the thermal problem into a controlled phase change process where evaporation cools the waste plastic surface, enabling continuous friction processing without temperature accumulation.
Solution Approach 2:
The patent utilizes the phase transition of moisture from liquid to vapor through evaporation. This phase change absorbs latent heat from the friction zone, effectively cooling the waste plastic surface and allowing repeated friction processing cycles without material degradation or excessive heat accumulation.
2Device complexity
If an open structure is used for friction processing, then device complexity is reduced, but external air intake and dust discharge reduce processing efficiency
Solution Approach 1:
The patent introduces moisture as an intermediary substance that serves multiple functions: it cools the friction zone through evaporation, suppresses dust generation by maintaining surface humidity, and enables continuous processing. This intermediary mediates between the mechanical friction process and the thermal/dust control requirements.
3Temperature
If moisture is injected to control frictional heat, then temperature control is improved, but foreign substance removal efficiency may be reduced due to reduced friction
Solution Approach 1:
The patent applies moisture in controlled amounts that are sufficient for cooling and dust suppression but not excessive to prevent friction. The moisture injection is optimized to maintain just enough surface humidity to enable continuous processing without significantly reducing the frictional force needed for foreign substance removal.
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
Enhances foreign substance removal efficiency by cooling frictional heat and swelling foreign substances for easy removal, maintaining the waste plastic below its glass transition temperature, thus preventing material fusion and maximizing resin recovery.
Implementation Method 1
supply mist-like moisture, controlling frictional heat and enhancing cooling through latent heat of evaporation
Implementation Method 2
enhancing cooling through latent heat of evaporation
Implementation Method 3
peels off the foreign substances attached to the waste plastic flake by rubbing the waste plastic flake in a rotational manner
Data Source
Figure 1~2
Figure 3~4
AI summary
The present disclosure relates to an apparatus for removing a foreign substance from waste plastic, and more particularly, to an apparatus for removing a foreign substance from waste plastic that removes a foreign substance attached to a surface of waste plastic by enhancing frictional performance of a surface of a waste plastic flake, and improves cooling performance by supplying moisture in the form of mist to frictional heat generated at that time.