Polypropylene Nonwoven Fabric Weight Reduction Strength
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Solution Overview
Problem
Conventional non-woven fabrics face challenges in achieving excellent spinnability, softness, and tensile strength while allowing for weight reduction, particularly in applications like disposable diapers, where they are unstable and uncomfortable for skin contact, and have issues with polymer spinnability and mechanical properties.
Innovation Solution
A non-woven fabric formed with polypropylene homopolymer fibers that satisfy specific melt index and polydispersity index conditions, combined with a feel-improving agent like propylene-ethylene copolymers or alpha-olefin copolymers, to enhance spinnability, softness, and tensile strength, while allowing for weight reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the weight of non-woven fabric is reduced to enable weight reduction, then weight is reduced, but tensile strength and shape stability deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the melt index (a) and polydispersity index (b) of the polypropylene homopolymer to satisfy specific mathematical relationships (b/a ≤ 0.3 and (a^0.5 + b)^0.5 ≤ 3.6). This optimization of polymer parameters enables the production of non-woven fabric with reduced weight while maintaining excellent tensile strength and shape stability, resolving the contradiction between weight reduction and strength maintenance.
2Weight of moving object
If the weight of non-woven fabric is reduced to enable weight reduction, then weight is reduced, but shape stability deteriorates
Solution Approach 1:
The patent utilizes parameter changes by optimizing the melt index and polydispersity index of the polypropylene homopolymer within specific mathematical relationships. This precise control of polymer parameters ensures that even at reduced weights, the non-woven fabric maintains excellent shape stability and structural integrity, effectively resolving the contradiction between weight reduction and shape stability.
3Ease of manufacture
If conventional polypropylene is used for non-woven fabric, then manufacturing is simple, but spinnability and softness deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the melt index and polydispersity index of the polypropylene homopolymer to satisfy specific mathematical relationships. This optimization improves the spinnability of the polymer, enabling smooth and efficient fiber spinning while maintaining manufacturing simplicity and producing fabric with excellent softness.
Solution Approach 2:
The patent applies local quality by adding a feel-improving agent specifically to enhance the softness and tactile properties of the non-woven fabric. This targeted addition improves the surface characteristics and comfort without affecting the overall manufacturing process or the fundamental properties of the polypropylene homopolymer.
4Ease of manufacture
If conventional polypropylene is used for non-woven fabric, then manufacturing is simple, but softness deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the melt index and polydispersity index of the polypropylene homopolymer, which contributes to improved softness. Additionally, the addition of a feel-improving agent specifically targets the enhancement of tactile properties and softness, while maintaining manufacturing simplicity through the use of standard polypropylene homopolymer as the base material.
Solution Approach 2:
The patent uses a feel-improving agent as an intermediary substance to enhance the softness and tactile properties of the non-woven fabric. This intermediary agent bridges the gap between the basic polypropylene homopolymer and the desired softness requirement, improving comfort without complicating the manufacturing process.
Data Source
AI summary
The present invention relates to a non-woven fabric with improved mechanical strength, and more particularly, to a non-woven fabric exhibiting excellent spinnability, excellent softness, and excellent tensile strength while enabling a weight reduction.