Polyethylene Yarn Composition for Dimensional Stability and Melt Flow
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Solution Overview
Problem
Conventional high molecular weight polyethylene yarns with high viscosity face challenges in melt flowability during manufacturing, leading to complex processes and solvent management issues, while low molecular weight polyethylene yarns suffer from low strength, high elongation, and poor dimensional stability, limiting their industrial applicability.
Innovation Solution
A polyethylene yarn with a maximum thermal shrinkage stress of 0.1 to 0.7 g/d, melt index of 5 to 25 g/10 min, polydispersity index of 5 to 20, number average molecular weight of 1000 to 10,000 g/mol, and crystallinity of 65 to 85% is developed, ensuring excellent dimensional stability and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If high molecular weight polyethylene is used to achieve high viscosity and good dimensional stability, then dimensional stability is improved, but melt flowability deteriorates making manufacturing difficult
Solution Approach 1:
The patent changes the molecular weight parameter from high to low range, and adjusts the melt index parameter to 5-25 g/10 min to achieve both good dimensional stability and manufacturability. This parameter transformation resolves the contradiction between dimensional stability and melt flowability.
Solution Approach 2:
The patent applies different quality characteristics to different aspects of the yarn: low molecular weight for melt flowability during manufacturing, while maintaining specific thermal shrinkage stress (0.1-0.7 g/d) for dimensional stability in the final product. This local quality differentiation resolves the contradiction.
2Ease of manufacture
If low molecular weight polyethylene is used to improve melt flowability, then ease of manufacture is improved, but strength and dimensional stability deteriorate
Solution Approach 1:
The patent optimizes the molecular weight parameter to a low range while controlling the melt index within 5-25 g/10 min, and specifies thermal shrinkage stress of 0.1-0.7 g/d. These parameter changes enable low molecular weight polyethylene to achieve both ease of manufacture and adequate strength.
Solution Approach 2:
The patent creates a composite structure through the specific yarn construction that combines low molecular weight polyethylene with controlled crystallinity (65-85%) and thermal shrinkage stress characteristics, achieving a material that simultaneously provides ease of manufacture and sufficient strength.
3Ease of manufacture
If low molecular weight polyethylene is used to improve melt flowability, then ease of manufacture is improved, but dimensional stability deteriorates with high elongation
Solution Approach 1:
The patent transforms the dimensional stability parameter by specifying thermal shrinkage stress of 0.1-0.7 g/d and crystallinity of 65-85%, which compensates for the inherent high elongation of low molecular weight polyethylene. This enables low molecular weight material to achieve both ease of manufacture and dimensional stability.
Solution Approach 2:
The patent applies preliminary heat treatment and tensioning during yarn manufacturing to pre-establish the dimensional structure, creating thermal shrinkage stress that counteracts the high elongation tendency of low molecular weight polyethylene during subsequent weaving and post-processing.
4Stability of the object's composition
If high molecular weight polyethylene is used to achieve high viscosity, then dimensional stability is improved, but process complexity increases due to solvent management
Solution Approach 1:
The patent changes the molecular weight parameter from high to low range, which fundamentally alters the processing characteristics. Low molecular weight polyethylene with melt index 5-25 g/10 min achieves adequate dimensional stability without requiring complex solvent management systems, thereby simplifying the manufacturing process.
Solution Approach 2:
The patent extracts the problematic high viscosity characteristic from the polyethylene material by selecting low molecular weight variants, thereby removing the need for complex solvent management infrastructure while retaining sufficient dimensional stability through controlled thermal shrinkage stress.
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 yarn exhibits high dimensional stability and thermal conductivity, maintaining shape integrity and cool feeling properties even after post-processing, enhancing its industrial applicability and fabric quality.
Implementation Method 1
A cool feeling is imparted to a cool feeling fiber material by using thermal conductivity of the fiber itself
Implementation Method 2
a polyethylene yarn having a maximum thermal shrinkage stress of 0.1 to 0.7 g/d
Data Source
AI summary
Provided are a polyethylene yarn having improved dimensional stability and a functional fabric including the same, and more particularly, a polyethylene yarn having improved dimensional stability, which may prevent shape deformation after post-processing such as weaving and cutting, and a functional fabric including the yarn to provide a user with a cool feeling are provided.