Helical Fastener for Polyester Fiber Panel Pull-Out Strength
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Solution Overview
Problem
Existing fastening devices are ineffective for securely attaching polyester fiber panels to substrates due to the high connective strength of the fibers, which prevents common fasteners from penetrating the panel.
Innovation Solution
A fastening device with a helical member surrounding a cylindrical portion, designed to penetrate the fibers of the panel upon rotation, and a compression flange that increases the density of the fibers around the fastener, providing high pull-out strength without the need for glue or resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If common fasteners are used to attach polyester fiber panels, then the installation process is simple, but the fasteners cannot penetrate the panel due to high fiber connective strength
Solution Approach 1:
The patent changes the geometric parameters of the fastener by providing an asymmetric thread profile on the helical member, where the leading edge has a greater thread angle than the trailing edge. This parameter change enables the fastener to effectively penetrate the high-density polyester fiber panel while maintaining secure attachment.
2Reliability
If epoxy resin is used to attach mounting points to fibreglass panels, then secure attachment is achieved, but this method cannot be applied to polyester panels because resins cannot be absorbed
Solution Approach 1:
The patent replaces the chemical bonding method (epoxy resin absorption) with a mechanical fastening system. The helical member with asymmetric thread profile mechanically penetrates and anchors into the polyester fiber panel, providing secure attachment without requiring chemical absorption or resin materials.
3Strength
If impaling hooks are used to penetrate fibreglass panels, then penetration is achieved, but these hooks cannot penetrate polyester fiber panels
Solution Approach 1:
The patent modifies the geometric parameters of the penetrating element by providing a helical member with asymmetric thread angles. The leading edge has a greater thread angle than the trailing edge, creating an optimized profile that enables effective penetration of polyester fiber panels, which conventional impaling hooks cannot penetrate.
4Reliability
If a helical member with asymmetric thread angles is used, then effective penetration of polyester fibers is achieved, but the fastener design becomes more complex
Solution Approach 1:
The patent introduces parameter changes in the form of asymmetric thread angles on the helical member to resolve the penetration effectiveness issue. While this does increase structural complexity slightly, the asymmetric profile is integrated into the standard helical fastener design, maintaining relative simplicity while achieving reliable penetration of polyester fiber panels.
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 enables quick and easy attachment of polyester fiber panels to substrates with high security, as the helical design effectively penetrates the panel fibers and the compression flange enhances the pull-out force, while maintaining a hidden fastening mechanism.
Implementation Method 1
a helical member surrounding the cylindrical portion for penetrating into fibers of the panel upon rotation of the helical member
Implementation Method 2
a compression flange surrounding the base of the cylindrical portion
Data Source
AI summary
A method and fastening device for attaching polyester fiber panels to a substrate, such as a wall or a ceiling. The fastening device comprises an anchor part for attachment to the substrate and a fastening part for attachment to the panel. The fastening part comprises a cylindrical portion, a helical member surrounding the cylindrical portion for penetrating the panel upon rotation of the helical member and a recess in the cylindrical portion for receiving the anchor part. The thread angle of the leading edge of the helical member is greater than the thread angle of the trailing edge.