Wool Pile Fabric Finishing for Shearling-Like Softness
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Solution Overview
Problem
The high cost and limited supply of natural sheepskin products due to quality variations and limited availability of sheepskin, coupled with the inability of existing artificial fur and fleece products to replicate the desirable qualities of genuine sheepskin, necessitate an alternative that mimics the characteristics of shearling.
Innovation Solution
A method to create a natural wool, deep pile fabric that closely resembles shearling by processing wool fibers with a textile scrim, involving steps like carding, slivering, knitting, rough shearing, polishing with heated rollers, and applying conditioning solutions to achieve a soft, dense, and breathable fabric that replicates the performance characteristics of natural sheepskin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural sheepskin is used to manufacture products, then the products have desirable qualities (softness, breathability, insulation), but the cost is high and supply is limited due to quality variations and limited availability
Solution Approach 1:
The patent creates an artificial pile fabric that copies the structure and properties of natural sheepskin. The fabric uses a textile scrim base with wool fibers attached to replicate the leather-fleece composite structure, providing similar insulation and breathability without relying on limited natural sheepskin supplies
Solution Approach 2:
The patent modifies the parameters of the pile fabric through controlled finishing processes including heat treatment (heating to 100-200°C), mechanical polishing, and chemical conditioning. These parameter changes transform the coarse, bristly wool into a soft, supple material that mimics the tactile and functional properties of natural sheepskin
2Productivity
If artificial fibers are used to make artificial fur and fleece products, then the supply is increased and cost is reduced, but the products lack the desirable qualities of genuine natural wool fleece and shearling
Solution Approach 1:
The patent uses a composite structure combining a textile scrim (synthetic or natural fiber base) with wool fibers attached to the surface. This composite approach allows the use of abundant, cost-effective materials while maintaining the functional properties of natural sheepskin through the wool component
Solution Approach 2:
The patent applies extensive finishing treatments including heating, polishing, and conditioning to transform the physical and chemical parameters of the wool fibers. These treatments soften the wool, remove coarse characteristics, and develop a supple hand feel that equivalence to genuine sheepskin
3Ease of manufacture
If wool pile fabric is made without proper finishing processes, then the manufacturing process is simpler, but the wool pile is coarse, bristly and abrasive making it unsuitable for clothing and footwear
Solution Approach 1:
The patent employs a multi-step finishing process that systematically changes the physical parameters of the wool pile. Heating to 100-200°C softens the fibers, mechanical polishing smooths the surface, and chemical conditioning agents modify the fiber structure to eliminate coarseness and abrasiveness
Solution Approach 2:
The patent performs preliminary finishing treatments during the manufacturing process itself, integrating softening and polishing steps before the fabric is ready for use. This ensures the fabric achieves the desired softness and suppleness as part of the core manufacturing process rather than as a separate post-processing step
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 resulting fabric is soft, dense, and breathable, closely approximating natural sheepskin fleece, making it suitable for use in footwear and apparel while reducing costs and increasing supply by utilizing processed wool fibers.
Implementation Method 1
polishing the wool fiber side of the pile fabric by guiding the length of pile fabric over one or more heated first polishing rolls
Implementation Method 2
The rolls rake the wool pile, heating it to a temperature sufficient to polish the wool fibers
Implementation Method 3
The rolls rake the wool pile, heating it to a temperature sufficient to polish the wool fibers
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A method of making a sheared wool, deep pile fabric that closely resembles natural sheepskin fleece that includes forming a length of wool pile fabric having natural wool fibers on one side and a scrim on an opposing side and finishing the wool pile fabric as natural shearling. The finishing process includes polishing the wool fiber side of the pile fabric by guiding the length of pile fabric over one or more heated first polishing rolls, applying a sheepskin conditioning solution to the wool fiber side of the pile fabric, further polishing the wool fiber side of the pile fabric by guiding the fabric a plurality of times over one or more second heated polishing rolls, and cutting the wool fibers to a designated length.