PET Melt Direct Spinning Viscosity Control
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Solution Overview
Problem
The existing PET industrial yarn manufacturing process through solid-state polycondensation faces challenges such as long production cycles, high energy consumption, and difficulties in transporting high-viscosity melts, which limits the scalability and flexibility of melt direct spinning manufacturing.
Innovation Solution
A PET industrial yarn melt direct spinning method and device utilizing a high-capacity continuous polymerizing apparatus, multiple liquid tackifying reactors, and multi-head spinning units, with optimized melt pipeline arrangements to maintain viscosity and consistency, enabling flexible and intensive production of high-viscosity polyester melts for multiple PET industrial yarns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solid-state polycondensation chip spinning process is used, then high-viscosity chips can be produced, but production cycle becomes long and energy consumption increases
Solution Approach 1:
The invention transitions from solid-state polycondensation to liquid-state melt direct spinning. By maintaining the polyester in liquid melt state throughout the process and using controlled cooling to achieve crystallization after spinning, the process eliminates the time-consuming solid-state polycondensation step while still producing high-viscosity yarn with intrinsic viscosity of 0.85-1.05 dL/g
Solution Approach 2:
The invention changes the physical state parameter from solid to liquid during processing. By conducting polycondensation and spinning in the liquid melt state at elevated temperatures, then controlling the cooling rate to achieve desired crystallinity and viscosity in the final product, the process dramatically reduces production time while maintaining high intrinsic viscosity
2Manufacturing precision
If solid-state polycondensation chip spinning process is used, then high-viscosity chips can be produced, but facility investment and energy consumption increase
Solution Approach 1:
The invention eliminates the need for separate solid-state polycondensation facilities by conducting the entire process in liquid melt state. The continuous melt spinning system replaces batch solid-state polycondensation equipment, reducing facility investment while maintaining energy efficiency through continuous processing
Solution Approach 2:
The invention implements continuous melt direct spinning where polyester is continuously fed, melted, extruded, and spun without interruption. This continuous process eliminates the repeated heating and cooling cycles of batch solid-state polycondensation, significantly reducing energy consumption while producing high-viscosity yarn consistently
3Productivity
If high-viscosity melt is transported through pipelines, then melt direct spinning can be achieved, but viscosity drop and inconsistency occur
Solution Approach 1:
The invention segments the production system into dedicated modules: continuous polymerizer, liquid tackifying reactor, and multi-head spinning units. Each module is optimized for its specific function, and the segmented architecture allows precise control of melt properties at each stage, maintaining viscosity consistency throughout the process
Solution Approach 2:
The invention performs preliminary tackifying treatment in the liquid tackifying reactor before the melt enters the spinning boxes. This preliminary action adjusts the melt viscosity to optimal levels and stabilizes the polymer structure in advance, ensuring consistent viscosity during subsequent spinning operations and preventing viscosity drop
4Adaptability or versatility
If multiple PET industrial yarns are produced, then market demand can be satisfied, but manufacturing flexibility is required
Solution Approach 1:
The invention designs the continuous polymerizer and liquid tackifying reactor as universal units that can process different polyester formulations. The multi-head spinning units can be independently configured to produce various yarn specifications. This universal design allows a single manufacturing system to produce multiple PET industrial yarn types, satisfying diverse market demands without requiring separate production lines
Solution Approach 2:
The invention implements dynamic adjustability in the spinning system where each spinning head can independently adjust parameters such as spinning speed, temperature, and extrusion rate. This dynamic control allows rapid switching between different yarn specifications and types, providing manufacturing flexibility while maintaining system simplicity through standardized modular components
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 achieves efficient energy use, consistent melt quality, reduced investment and energy consumption, and increased spinning capacity, while minimizing viscosity drop and adapting to market demands for various PET industrial yarns.
Implementation Method 1
liquid tackifying reactors each connected with the high-capacity continuous polymerizing apparatus through a split-flow pipeline, wherein the base polyester melt after tackified by the liquid tackifying reactor has the intrinsic viscosity reaching 0.90 ̃1.10 dL/g
Implementation Method 2
The melt pipeline between the spinning unit and a discharge gate of the liquid tackifying reactor has a length of transportation not exceeding 15 m and has a diameter of 25 ̃100 mm
Implementation Method 3
preparing base polyester melt that is polyethylene terephthalate (PET) melt having intrinsic viscosity of 0.63 ̃0.68 dL/g
Implementation Method 4
high-capacity continuous polymerizing apparatus and used for preparing base polyester melt
Data Source
AI summary
A PET industrial yarn melt direct spinning manufacturing method and a device thereof are disclosed. The device includes a polymerizer preparing base polyester melt, liquid tackifying reactors, and multi-head spinning units. The liquid tackifying reactors are connected with the polymerizer through split-flow pipelines respectively and after tackified by the tackifying reactors, the base polyester melt has its intrinsic viscosity reaching 0.90-1.10 dL/g. Each of the liquid tackifying reactors is connected with spinning units, and the spinning units are connected to the liquid tackifying reactors through melt pipelines. Each of the spinning units is provided with spinning boxes. The device solves the transportation problem of melt with high viscosity, combines both scale efficiency of the condensation production and market demand of multiple PET industrial yarns, and has the characteristic of integrating flexible production and intensive production.