Multicomponent Polypropylene Elastomer Fiber for Nonwoven Loft
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Solution Overview
Problem
Synthetic fibers and nonwoven fabrics lack the soft feel and loft of natural fibers due to their planar structure, and existing methods to impart bulkiness or loft, such as crimping and bicomponent fibers, are not cost-effective or do not adequately enhance strength and softness.
Innovation Solution
A multicomponent fiber comprising a first polypropylene with a high melt flow rate (MFR) and a second polypropylene with a propylene-based elastomer, blended in a side-by-side configuration to create a fabric with increased z-directional thickness and softness while maintaining high tensile strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If mechanical treatments such as crimping, air jet texturing, or pleating are applied to synthetic fibers, then loft and bulkiness are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the material composition parameters by incorporating elastomeric segments into the fiber structure, allowing the fiber to achieve loft and bulkiness through material properties rather than mechanical processing. The elastomeric content ranges from 5-50 wt% and the fiber diameter ranges from 10-50 micrometers, creating intrinsic volume without complex manufacturing equipment
Solution Approach 2:
The patent creates a composite fiber structure combining polypropylene base material with elastomeric segments (such as polyethylene-co-vinyl acetate or styrene-butadiene rubber). This composite approach provides both structural integrity and loft characteristics, eliminating the need for separate mechanical texturing processes
2Volume of stationary object
If bicomponent fibers are used to increase bulkiness or loft, then volume is improved, but strength may be compromised
Solution Approach 1:
The patent segments the fiber into a continuous load-bearing polypropylene matrix and dispersed elastomeric segments. The polypropylene component maintains tensile strength while the elastomeric segments (5-50 wt%) provide bulkiness and loft. This segmentation allows each component to fulfill its specific function without compromising overall performance
Solution Approach 2:
The patent applies local quality by concentrating elastomeric content specifically in certain regions or as discrete segments within the fiber, rather than uniform distribution. This allows the fiber to have high loft in elastomeric-rich zones while maintaining strength in polypropylene-dominant zones, achieving both bulkiness and strength simultaneously
3Stability of the object's composition
If synthetic fibers are used instead of natural fibers, then manufacturing consistency is improved, but softness and hand feel deteriorate
Solution Approach 1:
The patent changes the surface and structural parameters of synthetic fibers by incorporating elastomeric segments and controlling fiber diameter (10-50 micrometers). These parameter changes create a softer hand feel and improved drape while maintaining the manufacturing consistency of synthetic materials. The elastomeric content of 5-50 wt% specifically targets softness enhancement
Solution Approach 2:
The patent creates a composite fiber system combining the consistency of polypropylene with the softness of elastomeric materials. This composite structure provides natural fiber-like softness and drape while retaining the manufacturing advantages of synthetic fibers, including batch-to-batch consistency and processability
Data Source
AI summary
A multicomponent fiber for nonwovens and methods for making and using same. The multicomponent fiber can include a first component comprising a first polypropylene having a MFR of at least 30 dg/min and a second polypropylene having a MFR of less than 20 dg/min. The multicomponent fiber can further include a second component comprising the first polypropylene and at least one propylene-based elastomer comprising propylene and about 10 wt % to about 30 wt % of one or more alpha-olefin derived units, based on a total weight of the elastomer, wherein the propylene-based elastomer has a MFR of at least 40 dg/min and a heat of fusion (Hi) of about 3 J/g to about 75 J/g, as determined by DSC.