Polyester Fiber Core-Sheath Structure for Car Seat Softness
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Solution Overview
Problem
Current polyester fibers used for car seats suffer from low elastic recoverability, high initial tensile resistivity leading to stinging hardness, and poor thermosetting properties, resulting in irregular quality and curling issues after repeated loads and heat treatment.
Innovation Solution
Developing polyester fibers with an initial tensile resistivity of 15 to 38 cN/dtex, an elastic recovery rate of 70% or more after 20% elongation, and a self-shrinkage percentage of 0.3% to 1.4% after dry heat treatment at 160° C., using a combination of polytrimethylene terephthalate (3GT) and polyethylene terephthalate (PET) or polybutylene terephthalate (PBT) with specific processing conditions to enhance softness, resistance, and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PET fibers are used for car seats, then high tenacity and stability are achieved, but low elastic recoverability causes the fabric to remain drawn under repeated loads
Solution Approach 1:
The patent uses core-sheath conjugate fibers combining PET core (providing tenacity and stability) with 3GT sheath (providing elastic recoverability). This composite structure allows each material to contribute its advantageous properties, resolving the contradiction between stability and elastic recoverability.
2Reliability
If PET fibers are used for car seats, then stable quality is maintained, but high initial tensile resistivity causes stinging hardness
Solution Approach 1:
The PET/3GT conjugate fiber structure reduces the initial tensile resistivity of the fabric by incorporating the softer 3GT material in the sheath layer, while the PET core maintains the stability and quality consistency. This composite approach eliminates stinging hardness while preserving quality stability.
3Object-affected harmful factors
If 3GT fibers are used to improve softness and elastic recoverability, then low initial tensile resistivity is achieved, but poor thermosetting property causes gradual shrinkage and irregular quality
Solution Approach 1:
The conjugate fiber structure uses PET core to provide thermosetting stability and prevent shrinkage, while 3GT sheath provides softness and elastic recoverability. The PET core acts as a stabilizing framework that maintains manufacturing precision while the soft 3GT sheath provides the desired surface properties.
4Object-affected harmful factors
If 3GT fibers are used for car seats, then excellent softness is achieved, but low tenacity and low elastic modulus result in insufficient strength
Solution Approach 1:
The core-sheath conjugate fiber assigns the tenacity function to the PET core and the softness function to the 3GT sheath. This functional division allows the fabric to achieve both high tenacity (from PET core) and excellent softness (from 3GT sheath), resolving the contradiction between strength and softness.
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 fibers produce a woven or knitted fabric that is resistant to repeated loads, maintains excellent surface softness and uniformity, and prevents projections, recesses, and curling, resulting in a superior car seat material with improved durability and appearance.
Implementation Method 1
an elastic recovery rate of 70% or more after 20% elongation
Implementation Method 2
a self-shrinkage percentage of 0.3% to 1.4% after dry heat treatment at 160° C.
Data Source
AI summary
This invention is polyester fibers with an initial tensile resistivity of 15 to 38 cN/dtex, a elastic recovery rate of 70% or more after 20% elongation, and a self-shrinkage percentage of 0.3% to 1.4% after dry heat treatment at 160° C. The polyester fibers of this invention can be used to obtain a woven or knitted fabric resistant against repeated loads, excellent in surface softness and uniformity, and free from projections/recesses and curling. Since the woven or knitted fabric obtained from the polyester fibers of this invention are highly resistant against repeated loads, it can be suitably used as a car seat loaded with human bodies.