Stitch-Bonded Flame Barrier Cap With Stretch for Mattress Cores
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Solution Overview
Problem
Existing flame barrier materials for mattresses lack stretch and recovery, leading to restricted foam deformation and increased labor costs during installation, while also posing skin irritation risks due to fiberglass use.
Innovation Solution
A stitch-bonded flame-retardant textile cap with machine direction stretch and recovery properties, formed from nonwoven fleece with elastomeric yarns, providing dimensional stability and ease of handling without the need for fiberglass, and allowing for form-fitting conformability to the mattress core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-woven flame barrier materials are used, then flame blocking and insulation character is improved, but stretch and recovery capacity is limited
Solution Approach 1:
The patent combines flame-retardant fibers (modacrylic, FR rayon, para-aramid) with elastomeric fibers (spandex, elastane) in a blended yarn construction. This composite material approach allows the fabric to simultaneously provide flame blocking properties from the FR fibers and stretch/recovery properties from the elastomeric fibers, resolving the contradiction between flame safety and mechanical flexibility.
Solution Approach 2:
The patent changes the material composition parameters by incorporating specific percentages of elastomeric fibers (e.g., 5-50% spandex) into the flame-retardant fabric. This parameter modification enables the fabric to achieve both flame resistance and adequate stretch/recovery capacity, transforming a rigid flame barrier into a flexible, adaptive material.
2Adaptability or versatility
If FR socks are used to provide stretch and recovery, then cushioning comfort is improved, but installation complexity and labor costs increase
Solution Approach 1:
The patent extracts the elastomeric stretch function from the complex FR sock construction and integrates it directly into the flame barrier fabric itself. Instead of using a separate sock structure that requires installation over the core, the stretch properties are built into the cap fabric, simplifying the overall construction to a single-piece cap that stretches over the core during manufacturing.
Solution Approach 2:
The patent merges the flame barrier function and the stretch/recovery function into a single integrated fabric structure. The cap combines FR fibers for flame protection with elastomeric fibers for stretch, eliminating the need for separate FR sock and outer cover layers, thereby reducing installation complexity and labor requirements.
3Reliability
If fiberglass yarns are used in FR socks, then flame resistance is improved, but skin irritation risk increases
Solution Approach 1:
The patent replaces durable but irritating fiberglass yarns with alternative flame-retardant fibers (modacrylic, FR rayon, para-aramid) that provide equivalent flame resistance without the skin irritation problem. These alternative fibers are softer and safer for worker handling and user contact, eliminating the harmful effect while maintaining the protective function.
Solution Approach 2:
The patent converts the harmful property of fiberglass (skin irritation) into a benefit by selecting alternative FR fibers that are inherently softer and more comfortable. The modacrylic and FR rayon fibers provide flame resistance through their chemical composition rather than through abrasive physical structure, transforming a harmful material into a beneficial one that protects both workers and users.
4Reliability
If FR caps are made from slit FR sock material, then flame protection is provided, but handling difficulty and distortion increase
Solution Approach 1:
Instead of cutting and shaping FR sock material into caps (which causes distortion), the patent inverts the approach by knitting the cap directly in the desired shape using circular knitting machines. This inversion of the manufacturing sequence eliminates handling and cutting operations, preventing distortion and improving ease of operation while maintaining flame protection.
Solution Approach 2:
The patent replaces mechanical cutting and shaping operations with a knitting process that forms the cap shape directly during fabrication. The circular knitting machine creates the cap's three-dimensional form through programmed stitch patterns, eliminating the need for subsequent cutting, sewing, and shaping operations that cause material distortion and handling difficulties.
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 solution enhances ease of use and reduces labor costs by providing a form-fitting, stretchable flame barrier that maintains cushioning comfort without fiberglass-related issues, ensuring effective flame protection and improved handling during mattress assembly.
Implementation Method 1
stitch-bonded flame-retardant textile cap with machine direction stretch and recovery properties, formed from nonwoven fleece with elastomeric yarns
Data Source
AI summary
A mattress including a stretchable flame-retardant textile cap incorporating a top panel of flame retardant material operatively connected to a stitch-bonded flame retardant textile skirting with machine direction stretch and recovery properties disposed over a resilient mattress core to provided flame barrier protection to the mattress core.