Waste Plastic Bottle Slitting for Higher-Purity Recycling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing plastic bottle recycling methods are energy-intensive, generate significant wastewater, and have low separation purity and high costs due to the need for high-energy processes like heating and boiling, as well as complex sorting of different materials.
Innovation Solution
A composite treatment process for waste plastic bottles involving directional adjustment, stretching, flattening, slitting, and screening to separate bottle bodies into high-purity plastic strips, omitting steps like heating and boiling, by using a system with conveying, stretching, feeding, slitting, and cleaning devices to leverage physical properties for separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heating and boiling processes are used to remove label stickiness and clean plastic bottles, then cleaning effectiveness is improved, but energy consumption increases significantly
Solution Approach 1:
The patent replaces thermal processing (heating and boiling) with mechanical processing (crushing, stirring, and washing). The high-speed rotating stirrers mechanically remove label residue and contaminants from crushed plastic bottles, eliminating the need for energy-intensive heating and boiling processes while maintaining effective cleaning.
Solution Approach 2:
The patent changes the processing parameters from high-temperature thermal treatment to mechanical force application. By using high-speed rotation of stirrers and controlled crushing, the process achieves effective cleaning through mechanical energy rather than thermal energy, significantly reducing overall energy consumption.
2Reliability
If heating and boiling processes are used to clean plastic bottles, then cleaning effectiveness is improved, but wastewater generation increases
Solution Approach 1:
The patent replaces wet thermal cleaning processes with mechanical dry cleaning methods. The high-speed stirrers and crushing mechanism mechanically separate and remove contaminants without requiring large volumes of water for boiling and rinsing, thereby dramatically reducing wastewater generation.
3Manufacturing precision
If complex sorting processes are used to separate bottle caps, labels, and bottle bodies, then separation purity is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies segmentation by crushing bottles into smaller pieces that naturally separate by density and material type during the mechanical processing. Bottle caps, labels, and bottle bodies are differentiated through their physical properties during crushing and stirring, enabling separation without complex sorting equipment.
Solution Approach 2:
The patent enables self-service separation where the materials separate themselves through their inherent physical properties during mechanical processing. The different densities and structural characteristics of bottle caps, labels, and bottle bodies cause them to behave differently during crushing and high-speed stirring, allowing automatic separation without additional sorting devices.
4Quantity of substance
If traditional crushing and washing processes are used, then material recovery is achieved, but productivity is reduced due to multiple processing steps
Solution Approach 1:
The patent merges multiple processing steps into a single integrated system. Crushing, stirring, washing, and separation are combined into one continuous process where plastic bottles are crushed and processed in the same vessel, eliminating the need for multiple separate processing stages and improving overall productivity.
Solution Approach 2:
The patent implements continuous processing where materials are constantly fed, crushed, stirred, and separated in an unbroken sequence. The high-speed rotating stirrers continuously process materials without interruption, maintaining continuous useful action throughout the system and maximizing productivity.
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
Reduces energy consumption and wastewater generation while achieving high-purity plastic strips, facilitating broader recycling applications by improving sorting precision and efficiency.
Implementation Method 1
performing first flattening and stretching on bottle bodies of the target waste plastic bottles through a stretching gap of the stretching device
Implementation Method 2
performing second flattening on the bottle bodies of the target waste plastic bottles by a feeding gap of the feeding roller assembly
Implementation Method 3
slitting the bottle bodies of the waste plastic bottles into plastic strips and the remaining parts of the waste plastic bottles into waste materials
Implementation Method 4
conveying the plastic strips obtained through screening in Step S40 to a cleaning device for cleaning
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The present invention relates to the technical field of waste plastic recycling, and in particular to a composite treatment process and composite treatment system for waste plastic bottles. The composite treatment process comprises the steps of conveying waste plastic bottles and adjusting same to be upright, drafting, feeding, slitting, screening waste and plastic strips, cleaning the plastic strips and preliminarily removing water from the plastic strips, and dewatering and drying the plastic strips. According to the present invention, by means of the physical properties of cut products of bottle caps, bottle collars, and bottle bodies, the cut products of the bottle caps and the bottle collars are separated out to obtain bottle body plastic strips, so that the step of removing label stickiness by heating and boiling and the step of removing cap impurities by floating and filtering are omitted, thereby reducing energy consumption and reducing wastewater. Compared with the prior art that crushing is performed to obtain plastic sheets and then material screening is performed on the plastic sheets, causing high sorting difficulty and low sorting precision due to the small size of the plastic sheets, the present invention can achieve obtaining of bottle body plastic strips having higher purity, thereby facilitating broadening the application range of recycled plastics.