Laminated Glass Interlayer Film Adhesion and Rewinding
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Solution Overview
Problem
Interlayer films for laminated glass with a multilayer structure, comprising a plastic layer with high Young's modulus and a resin layer, face issues of poor adhesiveness between the layers, leading to peeling and blocking problems during rewinding.
Innovation Solution
Controlling the glossiness of the resin layer's surface within a specific range (10-40° specular glossiness) and adjusting the ten-point average roughness (5-55 μm) enhances adhesiveness between the plastic and resin layers, preventing blocking and ensuring smooth rewinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the roughness of the surface of the resin layer is reduced to improve adhesiveness between the plastic layer and the resin layer, then the adhesiveness is improved, but the resin layer in the form of a roll experiences blocking in which resin layers adhere to each other and become hard to rewind
Solution Approach 1:
The invention changes the surface parameter of the resin layer from roughness to glossiness, controlling it within a specific range (10-40 degrees). This parameter optimization simultaneously achieves high adhesiveness (reducing peeling) and prevents blocking during rewinding, resolving the technical contradiction between these two opposing requirements
Solution Approach 2:
The invention applies different surface properties to different locations: the surface contacting the plastic layer is controlled for high glossiness to ensure adhesiveness, while the outer surface of the rolled resin layer maintains properties that prevent blocking. This local differentiation of surface quality allows both requirements to be satisfied simultaneously
Data Source
Figure 1
AI summary
The present invention aims to provide an interlayer film for laminated glass which has a laminated structure including a plastic layer with a high Young's modulus and a resin layer, which is excellent in impact resistance and penetration resistance, which has high adhesiveness between the plastic layer and the resin layer, and which prevents blocking of the resin layer, and a laminated glass including the interlayer film for laminated glass. The present invention relates to an interlayer film for laminated glass, having a multilayer structure including: a plastic layer with a Young's modulus of 1 GPa or more; and a first resin layer on a first surface of the plastic layer, the first resin layer having a glossiness of 10 to 40 on the surface on the side to be in contact with the plastic layer.