Laminated Glass Interlayer Film Adhesion and Handling
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Solution Overview
Problem
Conventional interlayer films for laminated glass exhibit low processability and adhesivity issues, leading to positional displacement and poor handling properties, as well as low adhesive force between plastic and resin layers, resulting in inadequate safety and penetration resistance.
Innovation Solution
An interlayer film with a plastic layer having a Young's modulus of at least 1 GPa and a first resin layer, where the proportion of non-contact area with the plastic layer is less than or equal to 75%, and optionally a second resin layer with a lower Young's modulus, enhancing adhesivity and handling properties through thermocompression bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional interlayer films are used, then the structure is simple, but the processability is low and positional displacement occurs
Solution Approach 1:
The interlayer film is divided into multiple layers including a resin layer, a plastic layer, and an adhesive layer. This segmentation allows each layer to perform its specific function, improving overall processability while maintaining manageable complexity through functional specialization.
Solution Approach 2:
The invention uses a composite structure combining resin, plastic, and adhesive materials in specific layers. This composite approach enhances processability and prevents positional displacement by leveraging the complementary properties of each material, resolving the contradiction between simplicity and performance.
2Reliability
If plastic layer and resin layer are layered, then the interlayer film is formed, but the adhesive force between layers is low and handling properties are poor
Solution Approach 1:
An adhesive layer is introduced as an intermediary between the plastic layer and resin layer. This adhesive layer specifically enhances the bonding between layers, improving adhesive force and handling properties without requiring changes to the base plastic or resin materials.
Solution Approach 2:
The invention controls the thickness and material properties of each layer, particularly the adhesive layer, to optimize bonding. By adjusting parameters such as adhesive layer thickness (5-50 μm) and material composition, the adhesive force and handling properties are significantly improved.
3Reliability
If the non-contact area between plastic layer and resin layer is large, then the structure is simple, but the adhesivity is insufficient
Solution Approach 1:
The adhesive layer serves as a mediator that bridges the plastic and resin layers, ensuring adequate adhesivity even when direct contact area between plastic and resin is limited. This resolves the contradiction by providing bonding functionality without requiring extensive direct contact between the primary structural layers.
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 significantly improves adhesivity and handling properties of laminated glass, reducing the likelihood of large broken pieces and enhancing safety by promoting a spider's web-like break pattern, while maintaining high penetration resistance.
Implementation Method 1
enhancing adhesivity and handling properties through thermocompression bonding
Data Source
AI summary
There is provided an interlayer film for laminated glass with which the adhesivity between a plastic layer and a resin layer can be heightened and the handling properties of laminated glass can be enhanced. The interlayer film for laminated glass according to the present invention includes a plastic layer with a Young's modulus of higher than or equal to 1 GPa and a first resin layer layered on a first surface of the plastic layer, and is provided with a second resin layer layered on a second surface opposite to the first surface of the plastic layer or is provided with no second resin layer on a second surface opposite to the first surface of the plastic layer, and when a first lamination interface between the plastic layer and the first resin layer on a section in the thickness direction of the interlayer film is observed, the proportion of the length of a portion, which is not brought into contact with the first resin layer, of the plastic layer in the first lamination interface to 100% of the whole length of the plastic layer in the first lamination interface is less than or equal to 75%.