PEF Yarn Continuous Drawing for High Storage Modulus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing two-stage spinning/drawing process for producing polyethylene-2,5-furandicarboxylate (PEF) raw yarns is inefficient and results in PEF raw yarns with insufficient storage modulus for high-strength applications like tires.
Innovation Solution
A method involving continuous drawing of the undrawn yarn into a PEF raw yarn without recovery, with a take-up to extrusion ratio of 700 to 2000, using a PEF-containing resin composition with an intrinsic viscosity of 0.5 to 1.5 dl/g, to enhance storage modulus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two-stage spinning/drawing process is used, then PEF raw yarn can be produced, but productivity is low and storage modulus is insufficient
Solution Approach 1:
The patent combines the spinning and drawing operations into a single integrated process. The undrawn yarn is drawn immediately after spinning without being recovered or processed separately, merging two distinct stages into one continuous operation. This eliminates the intermediate recovery step and achieves both high productivity and high storage modulus (1000-3000 MPa) in the final yarn product.
2Ease of manufacture
If undrawn yarn is recovered before drawing, then processing can be separated, but productivity decreases and storage modulus is insufficient
Solution Approach 1:
The patent maintains continuous operation throughout the spinning and drawing process. The undrawn yarn flows continuously from the spinneret through the drawing section without interruption or recovery. This continuous action eliminates idle time and processing interruptions, achieving high productivity while maintaining the necessary process separability through proper equipment design and parameter control.
3Ease of operation
If take-up rate to extrusion rate ratio is low, then processing is easier, but storage modulus is insufficient
Solution Approach 1:
The patent optimizes the take-up rate to extrusion rate ratio as a critical process parameter. By setting this ratio to 700-2000, the process achieves both ease of operation and high storage modulus. This parameter optimization allows the continuous drawing process to produce yarn with storage modulus of 1000-3000 MPa while maintaining stable and controllable processing conditions throughout the operation.
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
This method enables efficient production of PEF raw yarns with high storage modulus, improving productivity and strength for tire applications.
Implementation Method 1
an undrawn yarn, obtained by melt-spinning of a PEF-containing resin composition
Implementation Method 2
an undrawn yarn, obtained by melt-spinning of a PEF-containing resin composition, is continuously drawn into a PEF raw yarn
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed is a method for producing a polyethylene-2,5-furandicarboxylate (PEF) raw yarn including a spinning/drawing process wherein an undrawn yarn, obtained by melt-spinning of a PEF-containing resin composition, is continuously drawn into a PEF raw yarn without being recovered and the PEF raw yarn is taken up, wherein the ratio of a rate (T) of taking up the PEF raw yarn to a rate (E) of extrusion of the resin composition into filaments during the melt-spinning (T/E) is 700 to 2,000.