Auger Disc Screen With Airflow Control for Wrapping-Prone Waste

Solution Overview

Problem

Conventional disc screens face issues with material wrapping and uncontrolled lateral movement on auger screens, leading to reduced separation efficiency and increased downtime, especially when processing flexible materials like plastic film and textiles in municipal solid waste streams.

Innovation Solution

An auger disc screen system with adjustable rotation speed, air stream generators, and a tilt mechanism to control material flow, enhancing separation by size, shape, and flexibility, using non-round elastomeric discs and airflow to manage lateral motion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional disc screens are used for sorting mixed solid waste, then high throughput and cost-effectiveness are achieved, but wrapping-prone materials such as plastic film and textiles become entangled around shafts or discs, reducing separation efficiency and causing machine stoppage

Engineering Contradiction:

ImprovethroughputVSAvoidseparation efficiency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies dynamics by making the screen bed inclination angle adjustable during operation. The screen bed can be tilted upward to encourage shape-based separation or returned to horizontal to promote size-based separation, allowing the system to adapt its separation mechanism dynamically based on material composition and desired output

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes physical parameters of the screening system by adjusting the screen bed inclination angle and shaft rotation speed. These parameter changes enable the system to optimize separation performance for different waste stream compositions, particularly for wrapping-prone materials like plastic film and textiles

Inventive Principle:

Principle #35Parameter changes

2Reliability

If auger screens are used to reduce wrapping, then material entanglement is reduced through rotating screw flights, but uncontrolled lateral movement occurs causing materials to be pulled off to the side and discharged before effective separation

Engineering Contradiction:

Improveresistance to jammingVSAvoidseparation precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies dynamics by making the screen bed inclination angle adjustable during operation. The screen bed can be tilted upward to encourage shape-based separation or returned to horizontal to promote size-based separation, allowing the system to adapt its separation mechanism dynamically based on material composition and desired output

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes physical parameters of the screening system by adjusting the screen bed inclination angle and shaft rotation speed. These parameter changes enable the system to optimize separation performance for different waste stream compositions, particularly for wrapping-prone materials like plastic film and textiles

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If the screen bed is tilted upward to encourage shape-based separation, then flat items can climb to the top, but lateral movement interferes by pulling materials off to the side before effective separation

Engineering Contradiction:

Improveshape-based separationVSAvoidmaterial flow control

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent applies dynamics by making the screen bed inclination angle adjustable during operation. The screen bed can be tilted upward to encourage shape-based separation or returned to horizontal to promote size-based separation, allowing the system to adapt its separation mechanism dynamically based on material composition and desired output

Inventive Principle:

Principle #15Dynamics

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

Improves throughput, reliability, and material classification by extending dwell time and promoting upward travel of flexible items, reducing jamming, and enabling precise sorting into multiple fractions.

Implementation Method 1

An air stream generator may be positioned adjacent to the distal edge of the screen bed. The air stream generator may be configured to generate an air stream across the screen bed from the distal edge to the proximal edge.

Methodology Applied

Scientific EffectAir stream: Fluid Spray

Implementation Method 2

The screen bed may form a tilt angle with a plane horizontal to the ground, and the device may further include a tilt mechanism configured to change the tilt angle.

Methodology Applied

Scientific EffectGravity: Gravitation

Data Source

PatentUS12544796B1Device to sort a mixed solid waste stream

Publication Date: 2026.02.10 CP MANUFACTURING INC

AI summary

A system for sorting mixed solid waste includes a rotating auger disc screen, air stream generator, and optionally adjustable tilt and motor speed. Waste is conveyed across a screen bed defined by spaced discs mounted to rotatable shafts, which are configured to create both axial and transverse movement, producing diagonal flow paths. An air stream is directed across the screen to propel light or flexible materials toward a proximal edge, while heavier, bouncing, or rigid items may exit along different edges or fall through the screen. The device is tunable to separate material into multiple output fractions based on mass, shape, and flow behavior. Discs and shafts may have non-round profiles and elastomeric surfaces to increase agitation and reduce wrapping. In some embodiments, airflow and tilt angle may be dynamically adjusted. The system concentrates maintenance-risk materials such as long, sharp, or wrapping items to improve downstream equipment protection.