Partially oriented yarn (POY) generation using polyethylene terephthalate (PET) bottle flakes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The reuse of Polyethylene Terephthalate (PET) bottle flakes is limited due to their properties, which restrict their application in processing for target uses.
Innovation Solution
A method and system for generating Partially Oriented Yarn (POY) from PET bottle flakes involving crystallization, drying, melting, and extrusion processes to produce a consistent and high-quality yarn that can be further processed into Draw Texturized Yarn (DTY), utilizing specific temperature and pressure conditions to maintain intrinsic viscosity and moisture levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PET bottle flakes are used as raw material for yarn production, then recyclability and environmental sustainability are improved, but the processing limitations and property inconsistencies worsen
Solution Approach 1:
The patent applies parameter changes by precisely controlling multiple process parameters including intrinsic viscosity (0.748-0.752), b color value (60), temperature (160-180°C drying, 285-295°C melting), moisture level (<100 ppm), and pressure to transform PET bottle flakes into consistent POY product, overcoming the processing limitations of recycled material
Solution Approach 2:
The patent implements preliminary action through pre-crystallization and pre-drying of PET flakes before extrusion. The flakes undergo crystallization to achieve specific crystalline structure, followed by drying to reduce moisture below 100 ppm, which prepares the material in advance for successful extrusion and spinning operations
2Quantity of substance
If PET flakes with varying properties are processed, then material availability is improved, but yarn consistency and quality worsen
Solution Approach 1:
The patent establishes specific parameter ranges for PET flakes (intrinsic viscosity 0.748-0.752, b color value 60, transparent appearance) and maintains controlled processing conditions (temperature 160-180°C, dew point -40°C, moisture <100 ppm) to ensure yarn consistency while processing available recycled material
Solution Approach 2:
The patent implements feedback control by monitoring and maintaining consistent temperature and pressure in the spin beam, and by specifying precise parameter ranges for raw material selection, ensuring that variations in input material do not compromise output yarn quality
3Productivity
If high temperature processing is used to melt PET flakes, then processing efficiency is improved, but moisture control and intrinsic viscosity maintenance worsen
Solution Approach 1:
The patent applies preliminary action by drying PET flakes to moisture below 100 ppm at 160-180°C before high-temperature melting at 285-295°C. This pre-drying prevents moisture-related degradation during efficient high-temperature processing, maintaining intrinsic viscosity
Solution Approach 2:
The patent utilizes phase transitions by controlling the transition of PET from solid crystalline flakes through molten state to solidified yarn. The controlled heating through specific temperature ranges manages the phase transition while maintaining material properties
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 method effectively transforms PET flakes into POY and subsequently DTY, enhancing their properties for use in fabric production, improving dyeability and consistency, and expanding their application in textile manufacturing.
Implementation Method 1
charging the selected raw material into a crystallizer to generate a crystalline version thereof
Implementation Method 2
drying the crystalline version of the raw material with dehumidified air at a temperature of 160-180° C. and with a dew point of −40° C. to bring down a moisture level thereof below 100 parts per million (ppm)
Implementation Method 3
melting the dried crystalline version of the raw material through an extruder configured to have a temperature therein maintained at 285-295° C.
Data Source
AI summary
A method includes charging PET bottle flakes having particular characteristics as a raw material into a crystallizer to generate a crystalline version thereof, drying the crystalline version with dehumidified air at a temperature of 160-180° C. and with a dew point of −40° C. to bring down a moisture level thereof below 100 ppm, melting the dried crystalline version through an extruder configured to have a temperature therein maintained at 285-295° C., and feeding the melted raw material into a spin beam. The method also includes generating, through a spinneret, a number of filaments based on extruding, through the spinneret, the melted raw material fed into the spin beam, forming a yarn based on combining the number of filaments, and winding the formed yarn to generate a spool of Partially Oriented Yarn (POY) configured to be utilized as another raw material to generate a Draw Texturized Yarn (DTY).