Polyurethane Elastic Fiber Texturing Stability
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Solution Overview
Problem
Polyurethane elastic fibers experience instability during texturing due to variations in friction resistance, leading to yarn breakage and uneven fabric quality, and existing solutions using finish oils or surface modifications are either ineffective or economically unsound.
Innovation Solution
Incorporating specific inorganic compound particles with a refractive index of 1.4 to 1.6 and average particle size of 0.5 to 5 μm, along with porous silica, into the polyurethane elastic fiber to create protruded portions on the surface, which enhances friction properties and stability during texturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a finish oil is imparted in a large amount to improve texturing stability, then the texturing stability is improved to a certain degree, but the apparatus is drastically stained and the method becomes uneconomical
Solution Approach 1:
The invention changes the chemical composition parameters of the finish oil by specifying precise proportions of silicone oil (70-95 parts), polyester-modified silicone oil (5-20 parts), and polyether-modified silicone oil (5-20 parts). This parameter optimization allows effective texturing stability improvement with reduced finish oil quantity, preventing apparatus staining while maintaining reliability
Solution Approach 2:
The invention creates a composite finish oil system combining three different types of lubricants (silicone oil, polyester-modified silicone oil, and polyether-modified silicone oil). This composite approach provides synergistic effects that improve texturing stability more efficiently than single lubricants, reducing the total amount needed and thus minimizing apparatus staining
2Reliability
If finish oils containing insoluble materials like metallic soaps are used to improve texturing stability, then the stability is improved, but the insoluble material drops off during texturing causing fiber scum
Solution Approach 1:
The invention changes the physical state parameter of the lubricant from insoluble (metallic soaps) to completely soluble formulations. The specified composition of silicone oil and its modified derivatives ensures complete solubility in the fiber matrix, eliminating undissolved particles that would cause fiber scum while maintaining texturing stability
Solution Approach 2:
The invention replaces durable but problematic metallic soap lubricants with organic silicone-based lubricants that are specifically designed to be fully soluble and non-residually depositing. This substitution eliminates the fiber scum problem associated with insoluble materials
3Object-generated harmful factors
If powdery metallic soap is added to polyurethane solution to lower fiber stickiness, then the stickiness is reduced, but the filter and nozzle are clogged causing pressure increase and step instability
Solution Approach 1:
The invention changes the physical form parameter from powdery solid (metallic soap) to liquid/solution form (silicone oil and its derivatives). This parameter change ensures complete dissolution in the polyurethane solution, eliminating particle-related clogging of filters and nozzles while effectively reducing fiber stickiness
Solution Approach 2:
The invention uses silicone oil as an intermediary substance that mediates between the polyurethane solution and the fiber formation process. It provides lubrication to reduce stickiness without forming undissolved particles that would clog production equipment, thus maintaining step stability
4Reliability
If conventional surface modification methods are used to improve texturing stability, then some improvement is achieved, but sufficient texturing stability cannot be obtained
Solution Approach 1:
The invention optimizes the chemical composition parameters of the finish oil with precise ratios of different silicone-based lubricants. This compositional parameter optimization provides sufficient texturing stability that conventional methods fail to achieve, while the uniform application method maintains fiber surface uniformity
Solution Approach 2:
The invention employs a composite lubricant system combining multiple silicone-based compounds that work synergistically. This composite approach achieves sufficient texturing stability beyond what single conventional modifiers can provide, while the soluble nature of all components prevents surface unevenness
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 modified polyurethane elastic fibers exhibit improved texturing stability with reduced yarn breakage and unevenness, maintaining quality without the need for excessive fiber treating agents, thus reducing apparatus staining and production costs.
Implementation Method 1
Incorporating specific inorganic compound particles with a refractive index of 1.4 to 1.6 and average particle size of 0.5 to 5 μm, along with porous silica, into the polyurethane elastic fiber to create protruded portions on the surface
Data Source
AI summary
A polyurethane elastic fiber, containing inorganic compound particles that have an average particle size of 0.5 to 5 mm and that show a refractive index of 1.4 to 1.6, having at least one protruded portion that has a maximum width of 0.5 to 5 μm, in the fiber surface, per 120-μm length in the fiber axis direction.