Counter-rotating Plastic Processing Apparatus for Throughput
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Solution Overview
Problem
Existing plastics recycling apparatuses face challenges in achieving high-quality output with high throughput and efficient energy use, particularly when processing sensitive or strip-shaped materials, due to issues like premature melting, blockages, and uneven material intake, which are exacerbated by the same-direction rotation of mixing and extruder components.
Innovation Solution
The apparatus reverses the direction of rotation of the mixing and comminution implements relative to the extruder, reducing feed pressure and preventing overfilling, while optimizing the intake aperture geometry and screw dimensions to ensure adequate and consistent material intake without excessive stuffing, thereby improving throughput and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the screw rotation rate is raised to increase quantitative output, then productivity increases, but the screw subjects processed material to higher mechanical and thermal stress causing molecular chain damage
Solution Approach 1:
The patent inverts the conventional approach by rotating the mixing and comminution implements in the opposite direction to the extruder conveyance direction. This creates a counter-rotating flow that reduces feed pressure and prevents overfilling of the screw, allowing the screw to operate at lower rotation rates without compromising productivity, thus avoiding molecular chain damage from excessive mechanical and thermal stress
2Manufacturing precision
If the flight depth of the metering zone of the screw is made very large to improve material homogeneity, then manufacturing precision improves, but the screw rotation rate must be kept very small reducing productivity
Solution Approach 1:
The patent applies counter-rotation of the mixing implements to reduce the stuffing effect on the screw, enabling the use of larger flight depths without requiring very low rotation rates. This resolves the contradiction by allowing both high manufacturing precision through adequate flight depth and maintained productivity through reduced but not excessive rotation rates
3Manufacturing precision
If the temperature profile of the extruder is raised to compensate for material inhomogeneity, then manufacturing precision improves, but additional energy is introduced causing thermal damage and increased energy consumption
Solution Approach 1:
The patent inverts the rotation direction of mixing implements to create a counter-rotating flow that improves material homogeneity through better mixing. This reduces the need to raise the extruder temperature profile to compensate for inhomogeneity, thereby avoiding thermal damage to molecular chains and reducing energy consumption while maintaining manufacturing precision
4Manufacturing precision
If the diameter of the cutter compactor is increased to improve mechanical and thermal homogeneity, then manufacturing precision improves, but space requirement increases
Solution Approach 1:
The patent uses counter-rotation of mixing implements to improve material homogeneity through enhanced mixing action, eliminating the need to increase the cutter compactor diameter. This resolves the contradiction by achieving manufacturing precision through improved mixing mechanics rather than increased volume, thereby maintaining compact apparatus dimensions
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
This design enhances material intake performance, increases throughput, and extends maintenance intervals by preventing premature melting and blockages, leading to more stable and efficient operation of the recycling system.
Implementation Method 1
the direction of rotation of the mixing and comminution implements is opposite to the direction of conveying of the extruder
Implementation Method 2
is conveyed and, during this process, plastified or melted
Implementation Method 3
the plastics material introduced into the receiver is comminuted through rotation of the comminution and mixing implements
Data Source
AI summary
Disclosed is an apparatus for the processing of plastics, with a container with a rotatable mixing, where, in a side wall, an aperture is formed, where a conveyor is provided, with a screw rotating in a housing, wherein the imaginary continuation of the longitudinal axis of the conveyor in a direction opposite to the direction of conveying passes the axis of rotation, and wherein the ratio (V) of the active container volume (SV) to the feed volume (BV) of the container or of the cutter compactor (1), where V=SV/BV, is one where 4≤V≤30, where the active container volume (SV) is defined by the formulaSV=D3π4and D is the internal diameter of the container, and where the feed volume (BV) is defined by the formulaBV=D2π4·H,where H is the height of the intake aperture.