Elastic Windshield Film for Stone Chip Prevention
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Solution Overview
Problem
Existing stone chip-preventing films for vehicle windshields face challenges such as visual distortion, bending phenomena, and lengthy heat-based construction processes, which hinder efficient attachment and increase the risk of stone chips from small stones or hard foreign substances.
Innovation Solution
A protective film with a highly elastic base film layer, a surface-coated layer, an adhesive layer, and a release film layer, manufactured using ultraviolet curing and silicone adhesives, allowing for smooth attachment without heat, reducing flow marks, and enhancing construction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If heat-based molding is used to attach the protective film to the windshield, then the film can conform to the curved shape of the windshield, but the construction process becomes time-consuming and complex
Solution Approach 1:
The patent changes the physical parameter of the base film from heat-dependent molding to elasticity-dependent conforming. The highly elastic base film naturally stretches and conforms to the curved windshield shape without requiring thermal energy input, thereby reducing construction time while maintaining shape conformity.
Solution Approach 2:
The patent replaces the thermal-mechanical system (heat-based molding) with a purely elastic-mechanical system. The highly elastic base film uses its inherent elastic properties to conform to the windshield shape, eliminating the need for heating equipment and complex heat-based construction processes.
2Ease of manufacture
If T-die extrusion method is used to manufacture the protective film, then the film can be produced, but flow marks and bending phenomena occur causing visual distortion
Solution Approach 1:
The patent changes the manufacturing parameter from thick film (100-200 μm) to thin film (10-30 μm). This parameter change eliminates the flow marks and bending phenomena that occur in thicker films during T-die extrusion, while still maintaining adequate protection and visual clarity through the use of highly elastic materials.
Solution Approach 2:
The patent uses a composite structure with a highly elastic base film layer and a protective film layer. This composite approach allows the thin base film to provide conformability and elasticity while the protective layer provides durability, achieving both ease of manufacture and high manufacturing precision.
3Ease of manufacture
If polyethylene terephthalate (PET) is used as the base film material, then the film can be manufactured, but it requires heat application for molding which complicates the construction process
Solution Approach 1:
The patent changes the material parameter from conventional PET to highly elastic film material. This parameter change fundamentally alters the molding mechanism from heat-dependent to elasticity-dependent, simplifying the construction process while maintaining manufacturability.
Solution Approach 2:
The patent employs a highly elastic thin film as the base film, which inherently provides flexibility and conformability without requiring heat-based molding. This flexible film structure simplifies the construction process while maintaining ease of manufacture.
4Manufacturing precision
If the protective film is made thin to reduce weight and improve clarity, then visual distortion is reduced, but the film becomes difficult to manufacture and attach
Solution Approach 1:
The patent changes the material parameter to highly elastic film, which compensates for the reduced thickness. The high elasticity provides sufficient conformability and durability even at thin dimensions (10-30 μm), making thin film manufacturing and attachment feasible without compromising performance.
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 film prevents stone chips by ensuring smooth, efficient attachment and construction, maintaining visual clarity and reducing the likelihood of cracks from collisions with small stones or hard foreign substances.
Implementation Method 1
an adhesive layer (400) positioned under the base film layer (100)
Implementation Method 2
manufactured using ultraviolet curing
Implementation Method 3
a base film layer (100) formed of a highly elastic film
Data Source
AI summary
The present invention relates to an easily constructed stone chip-preventing protection film attachable to the outside of an automobile windshield.The easily constructed stone chip-preventing protection film attachable to the outside of an automobile windshield, according to the present invention, comprises: a substrate film layer (100); a surface coating layer (200) disposed on the substrate film layer (100); a protective film layer (300) disposed on the surface coating layer (200); an adhesive layer (400) disposed under the substrate film layer (100); and a release film layer (500) disposed under the adhesive layer (400).By the construction described above, since the easily constructed stone chip-preventing protection film attachable to the outside of an automobile windshield, according to the present invention, includes a substrate film layer formed of a high elastic film to configure an automobile windshield protection film, the film can be gently attached and easily constructed without performing a heating process according to the shape of the windshield, so as to enhance the construction efficiency and prevent a stone chip from being caused by an impact of a small stone or a hard foreign substance.