Stitch-Bonded Loop Fastener for Diaper Peel and Shear Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hook and loop fastening systems face challenges in achieving a combination of high peel strength and high shear strength, particularly in applications like diapers where secure and adjustable fastening is required.
Innovation Solution
A composite loop face fabric with a multi-bar stitch-bonded construction is developed, featuring a first yarn system forming flat stitches through a lightweight polymeric film substrate and a second yarn system creating raised loops above the ground layer, using specific stitching patterns (1-0, 0-1) for the ground yarns and (0-1, 2-1) for the loop yarns, which enhances both peel and shear strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a stitch-bonded loop fabric is used in a hook and loop fastening system, then the fastening system can be manufactured with improved ease of manufacture and reduced cost, but the peel strength and shear strength of the bond are insufficient
Solution Approach 1:
The patent applies composite materials by combining a polymeric film substrate with two distinct yarn systems (ground yarns and loop yarns) stitched through it. This creates a multi-component composite structure where each material contributes different properties: the film provides base strength and flexibility, the ground yarns provide structural stability and peel resistance, and the loop yarns provide shear resistance and hook engagement capability. This composite construction resolves the contradiction by achieving both manufacturability and high strength properties simultaneously.
Solution Approach 2:
The patent segments the loop fabric into two distinct yarn systems with different functions: ground yarns forming flat stitches for structural support and peel strength, and loop yarns forming raised loops for shear strength and hook engagement. This segmentation allows each yarn system to be optimized for its specific function while working together in the composite structure, resolving the contradiction between ease of manufacture and high strength performance.
2Ease of manufacture
If the loop fabric structure is simplified for easier manufacturing, then the ease of manufacture improves, but the combination of high peel strength and high shear strength cannot be achieved
Solution Approach 1:
The composite structure combines multiple materials (film substrate, ground yarns, loop yarns) each contributing specific properties that together ensure reliable bonding. The ground yarns provide peel resistance while loop yarns provide shear resistance, creating a reliable bond that would be difficult to achieve with a single material or simpler structure.
Solution Approach 2:
The patent applies local quality by giving different regions of the fabric different properties: the ground yarns create flat stitches for structural stability and peel resistance in one area, while the loop yarns create raised loops in another area for shear resistance and hook engagement. This local differentiation of properties ensures reliable bonding performance while maintaining ease of manufacture through a systematic construction approach.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A tear away diaper fastening system including a segment of loop material having a plurality of outwardly projecting loop elements adapted to engage cooperating hooking elements in juxtaposed contacting relation. The loop material includes a composite sheet of stitch bonded construction including a polymer film substrate layer. A first plurality of yarn elements extends in stitched relation through the substrate layer to define a plurality of parallel stitch lines of flat stitches extending along the machine direction of the sheet material to form a ground layer substantially covering an upper surface of the substrate layer. A second plurality of yarn elements extends in stitched relation through the substrate layer in zigzag crossing relation between parallel needle lines to define a plurality of raised loops extending above the ground layer.