Fiberglass Board Layer Staggering for Puncture-Resistant Back Covers
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Solution Overview
Problem
Glass fiber boards used in electronic device back covers exhibit poor puncture resistance due to inadequate inter-layer binding forces, leading to reduced reliability.
Innovation Solution
The glass fiber boards are designed with a helical staggering angle between layers, where fibers in adjacent layers are interlaced in a star shape, enhancing inter-layer binding forces and allowing puncture forces to be distributed across multiple directions, thereby improving puncture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a wood powder-based composite material is used to achieve cost-effectiveness and ease of processing, then manufacturing cost and processability are improved, but moisture absorption increases leading to deformation and strength reduction
Solution Approach 1:
The patent uses a composite material system combining wood powder with specific binders (polyurethane resin and polyvinyl alcohol) and additives (silane-modified polyethylene terephthalate). This composite formulation maintains the ease of processing advantage of wood powder while the polyvinyl alcohol and silane-modified PET components provide moisture resistance and dimensional stability, resolving the contradiction between processability and moisture resistance.
Solution Approach 2:
The patent modifies the chemical and physical parameters of the composite material by controlling the moisture content of wood powder (10-20%), selecting specific resin ratios, and adjusting curing conditions. These parameter changes optimize both processability and moisture resistance, allowing the material to maintain ease of manufacture while achieving reliable moisture performance.
2Strength
If conventional composite materials are used to ensure structural strength, then strength is improved, but environmental pollution increases due to harmful substances
Solution Approach 1:
The patent changes the chemical composition parameters by replacing conventional harmful binders with polyurethane resin and polyvinyl alcohol, which are environmentally friendly. The silane-modified polyethylene terephthalate additive further enhances environmental compatibility while maintaining structural integrity. This parameter change achieves both strength and environmental sustainability.
Solution Approach 2:
The patent employs biodegradable and environmentally compatible materials that can be disposed of or decomposed without harmful effects. The use of polyvinyl alcohol and silane-modified PET creates a composite that maintains necessary structural strength while being environmentally benign, aligning with sustainable manufacturing principles.
3Reliability
If fiberglass board is used to achieve high strength and moisture resistance, then reliability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies local quality enhancement by incorporating silane-modified polyethylene terephthalate as a specific additive in the composite formulation. This additive provides localized moisture resistance and dimensional stability enhancement without requiring complex manufacturing processes. The wood powder-based composite with targeted additives achieves reliable moisture performance through compositional optimization rather than process complexity.
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 helical staggering design increases the force area and stress dispersion effect, resulting in enhanced puncture resistance and reliability of the glass fiber boards.
Implementation Method 1
it has been found that when a silane-modified polyethylene terephthalate is used in a wood powder-based composite material, crosslinking between the silane-modified polyethylene terephthalate and a polyurethane resin occurs
Data Source
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AI summary
This application provides a glass fiber board, a back cover, an electronic device, and a preparation method for a glass fiber board, to improve puncture resistance of the glass fiber board and improve reliability of use of the electronic device. The glass fiber board includes a plurality of glass fiber layers, and the plurality of glass fiber layers are disposed in a stacking manner. Each glass fiber layer includes a plurality of first fibers and a plurality of second fibers. Each glass fiber layer has a first direction and a second direction. The plurality of first fibers extend along the first direction of the glass fiber layer and are arranged at intervals along the second direction of the glass fiber layer. The plurality of second fibers extend along the first direction of the glass fiber layer and are arranged at intervals along the first direction of the glass fiber layer. A helical staggering angle between at least two glass fiber layers is greater than 0 degrees and less than 90 degrees or is greater than 90 degrees and less than 180 degrees. A helical staggering angle between two glass fiber layers is an included angle between the first directions of the two glass fiber layers, or a helical staggering angle between two glass fiber layers is an included angle between the second directions of the two glass fiber layers.