Dotted Sol Bonding for Leak-Resistant Stuffed Fabric Layers
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Solution Overview
Problem
Conventional fabric layers with stitching connections allow stuffing to leak out, compromising aesthetics and waterproof performance, especially when a waterproof outer layer is used.
Innovation Solution
The outer and inner layers of the fabric are connected using a hot-melt dotted solvent (dotted sol) instead of stitching, forming a chamber to accommodate stuffing without stitching lines, with the dotted sol applied and heated to specific temperatures for bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If stitching is used to connect outer layer and inner layer, then the layers can be joined together, but stuffing leaks out through stitching lines and waterproof performance deteriorates
Solution Approach 1:
The patent replaces the mechanical stitching system with a thermal bonding system using hot-melt dotted sol. The adhesive is applied in dots and activated by heating elements to bond the outer layer and inner layer without creating penetrating stitching lines that would compromise waterproof performance.
Solution Approach 2:
The patent applies adhesive only at specific localized points (dotted sol pattern) rather than continuous stitching lines. This localized bonding approach provides sufficient structural strength while maintaining waterproof integrity in the non-bonded areas between dots.
2Strength
If stitching is used to connect layers, then layers can be joined, but aesthetic appearance deteriorates due to visible stitching lines
Solution Approach 1:
The mechanical stitching process is replaced with thermal dotted sol bonding, which creates invisible or minimal adhesive dots instead of visible stitching lines, significantly improving the aesthetic appearance of the fabric layer.
Solution Approach 2:
By concentrating adhesive application to small localized dots rather than continuous lines, the bonding provides necessary structural connection while minimizing visual impact and maintaining the smooth appearance of the fabric surface.
3Strength
If continuous adhesive application is used to bond layers, then strong bonding is achieved, but production efficiency decreases and material consumption increases
Solution Approach 1:
The continuous adhesive application is segmented into discrete dotted patterns. This segmentation reduces the total amount of adhesive required, speeds up the application process, and maintains adequate bonding strength at the critical connection points between layers.
Solution Approach 2:
Instead of applying adhesive continuously across all surfaces, the patent applies adhesive partially only at the specific dotted locations where bonding is needed, reducing material consumption and processing time while achieving sufficient bonding strength.
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
This method prevents stuffing leakage, enhances windproof, waterproof, and down-proof effects, and maintains moisture-proof and warmth retention in outdoor gear, offering a novel, aesthetically pleasing, and comfortable solution for outdoor applications.
Implementation Method 1
the dotted sol is applied and heated to specific temperatures for bonding
Implementation Method 2
hot-melt dotted sol
Implementation Method 3
the outer layer and the inner layer are pressed for 6 to 8 seconds by the pressure device
Data Source
AI summary
The present application provides a fabric layer, comprising: an outer layer on which a plurality of first connecting portions are arranged; and, an inner layer on which a plurality of second connecting portions are arranged, wherein the first connecting portions on the outer layer are bonded to the corresponding second connecting portions on the inner layer by dotted sol to form fabric layer connecting portions, so that a chamber is formed by every two adjacent fabric layer connecting portions, the outer layer and the inner layer to accommodate a stuffing. The present application further provides a sleeping bag comprising the fabric layer. With such an arrangement, windproof, waterproof and down-proof effects can be achieved.