Staged Waste Mixing Device With Oblique Screws for Uniform Blending
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Solution Overview
Problem
Conventional mixing systems face challenges in uniformly blending fiber and plastic waste due to varying mechanical properties, electrostatic interference, and thermal management issues, leading to inconsistent product quality and inefficient processing.
Innovation Solution
A waste mixing device with a major mixing set, sub-mixing set, and extruding-and-shaping set, featuring variable speed operation and oblique screw configurations, along with thermal management, to enhance mixing efficiency and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional twin-screw mixers operate at high rotational velocities to increase processing throughput, then productivity improves, but material extrusion disrupts blending uniformity and manufacturing precision deteriorates
Solution Approach 1:
The patent applies dynamics by enabling independent speed control of the first and second screws, transforming the fixed synchronized operation into a variable dynamic system. This allows optimization of each screw's rotational speed to balance throughput and blending uniformity, resolving the contradiction between productivity and manufacturing precision.
Solution Approach 2:
The patent changes the operational parameters by introducing independent speed control for each screw, allowing different rotational velocities to be optimized for different stages of mixing. This parameter adjustment enables high throughput while maintaining blending uniformity, addressing the contradiction between productivity and manufacturing precision.
2Ease of operation
If conventional mixers use synchronized rotational speeds to simplify operation, then ease of operation improves, but electrostatic charges on polymer particulates repel additive materials preventing uniform mixing
Solution Approach 1:
The patent applies dynamics by replacing fixed synchronized operation with independent variable speed control. This dynamic adjustment allows optimization of each screw's speed to manage electrostatic charges on polymer particulates, improving additive integration uniformity while maintaining ease of operation through automated control.
Solution Approach 2:
The patent changes the operational parameters by enabling different rotational speeds for each screw, allowing optimization of electrostatic charge management. This parameter change improves additive integration uniformity while maintaining operational simplicity through automated speed control systems.
3Device complexity
If single-screw extruders are used to simplify device structure, then device complexity reduces, but blending performance becomes insufficient for heterogeneous waste materials
Solution Approach 1:
The patent applies merging by combining two screws into a single mixer system, creating a dual-screw configuration that enhances blending capability for heterogeneous waste materials. This merged structure improves blending uniformity while maintaining reasonable device complexity through integrated design.
Solution Approach 2:
The patent applies universality by designing a dual-screw system that can handle multiple types of waste materials (fibers, plastics, fillers) with different mechanical properties. This multi-functional mixer achieves uniform blending across heterogeneous materials while maintaining acceptable device complexity through standardized components.
4Productivity
If high rotational velocities are used to increase processing speed, then productivity improves, but thermal management becomes insufficient causing premature polymer degradation
Solution Approach 1:
The patent applies dynamics by enabling independent speed control of each screw, allowing optimization of rotational velocities to balance processing speed with thermal management. This dynamic adjustment prevents premature polymer degradation while maintaining high productivity through efficient heat distribution.
Solution Approach 2:
The patent changes the operational parameters by introducing variable speed control, allowing optimization of thermal conditions during mixing. This parameter change prevents polymer degradation by controlling heat generation from friction, while maintaining high processing speed through efficient thermal management.
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 device achieves uniform mixing of fiber and plastic waste with additives, reducing material damage and improving product consistency through staged mixing and controlled thermal processing.
Implementation Method 1
Each of the heating-and-conveying units comprises a transmission tube being thermally conductive and at least one heating unit disposed at an outer side of the transmission tube
Implementation Method 2
The driving screw is rotatably and straightly arranged in the mixing passage of the base and comprises a driving helical section... The driven screw is rotatably and obliquely arranged in the mixing passage of the base and comprises a driven helical section
Data Source
AI summary
Waste mixing processing equipment has a waste mixing device and a feeding device. The waste mixing device has a major mixing set, a sub-mixing set, and an extruding-and-shaping set arranged in sequence. The major mixing device and the sub-mixing device each have a y-shaped mixing passage in a base and tapering toward a discharging port, a driving screw, and a driven screw obliquely disposed therein. Waste and additives/fillers are fed into the major mixing set by proportion, and are mixed sequentially through the major mixing set and the sub-mixing set. The waste and the additives/fillers are mixed, extruded, and conveyed by the driving screw and the driven screw in the y-shaped mixing passages of the major/sub-mixing sets, whereby mixing efficiency is improved.