Napped artificial leather and manufacturing method therefor
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Solution Overview
Problem
Conventional napped artificial leathers suffer from color unevenness, insufficient mechanical strength, and inadequate texture, particularly when dyed with disperse dyestuffs, leading to issues like rough skin feeling and reduced denseness.
Innovation Solution
A napped artificial leather comprising a nonwoven fabric with microfine fibers and a high-molecular elastic body, where the content of the elastic body is 15 to 35 mass%, the area ratio on the napped surface is 17% or less, and the napped fiber length is 250 μm or less, optimized to suppress color unevenness and enhance mechanical strength and texture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the napped fiber length is increased to suppress color unevenness, then color uniformity is improved, but skin feeling deteriorates and denseness is reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the napped fiber length within the range of 50 to 250 μm and the high-molecular elastic body content within 15 to 35 mass%. This optimization resolves the contradiction by finding the optimal parameter range that achieves both color uniformity and acceptable skin feeling, avoiding both extremes of too short (color unevenness) and too long (rough texture) fibers.
2Strength
If the content of high-molecular elastic body is increased to improve mechanical strength, then tensile strength is improved, but color unevenness occurs
Solution Approach 1:
The patent resolves this contradiction by optimizing the high-molecular elastic body content to 15-35 mass%, which is sufficient to provide mechanical strength while preventing excessive exposure that causes color unevenness. This parameter optimization ensures both structural integrity and aesthetic quality.
Solution Approach 2:
The patent uses a composite structure combining microfine fibers with high-molecular elastic body blocks distributed throughout the nonwoven fabric. This composite approach allows the elastic body to provide mechanical strength while the fiber matrix maintains color uniformity, resolving the contradiction between strength and appearance.
3Strength
If the area ratio of high-molecular elastic body on napped surface is increased to improve mechanical strength, then frictional wear property is improved, but color unevenness occurs
Solution Approach 1:
The patent optimizes the area ratio of high-molecular elastic body on the napped surface to be 17% or less, which provides sufficient frictional wear resistance while preventing the elastic body from dominating the surface and causing color unevenness. This precise parameter control resolves the contradiction between durability and appearance.
Data Source
AI summary
A napped artificial leather including: a nonwoven fabric containing microfine fibers and a high-molecular elastic body, the napped artificial leather having a napped surface, in which a content of the high-molecular elastic body is 15 to 35 mass %, an area ratio of the high-molecular elastic body present on the napped surface is 17% or less, and a napped fiber length is 250 μm or less.