Laminated Glass Interlayer Film Thickness for Uniform Deaeration
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Solution Overview
Problem
Conventional interlayer films for laminated glass exhibit insufficient deaeration properties during preliminary pressure bonding, leading to poor transparency, particularly in large-scale laminated glass used for buildings.
Innovation Solution
The interlayer film for laminated glass is designed with a thickness variation of less than 40 µm between central and end portions in the width direction, achieved by controlling extrusion conditions such as delivery pressure and die temperature during production, ensuring uniform pressure application and effective deaeration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional interlayer films with minute projections and recesses are used, then deaeration properties are improved, but transparency of the laminated glass deteriorates due to insufficient deaeration
Solution Approach 1:
The invention changes the thickness parameter of the interlayer film from a conventional uniform thin structure to a specific thickness range (30-200 μm) with controlled variation. This parameter change enables the film to maintain structural integrity while providing sufficient deaeration capacity, resolving the contradiction between deaeration properties and transparency.
Solution Approach 2:
The invention introduces thickness variation as a new dimension of control, measuring thickness at multiple positions (central portion and end portions) along the machine direction. By controlling thickness variation in the longitudinal dimension rather than relying solely on surface projections, the film achieves effective deaeration while maintaining optical clarity.
2Area of stationary object
If large-scale laminated glass is produced, then building applications are enabled, but defective deaeration occurs leading to poor transparency
Solution Approach 1:
The invention performs preliminary action by controlling the thickness distribution during the film manufacturing process itself. By pre-establishing uniform thickness within 30-200 μm across the entire film width before lamination, the film is prepared in advance to provide consistent deaeration performance across large-scale glass panels, preventing defective deaeration in building applications.
Solution Approach 2:
The invention creates equipotentiality in thickness distribution across the film width, ensuring that the central portion and end portions have comparable thickness values within the specified range. This uniform thickness distribution ensures consistent pressure application and deaeration performance across the entire large-scale laminated glass area, eliminating regional deaeration defects.
3Ease of manufacture
If thickness variation in the interlayer film is large, then manufacturing is easier, but pressure application during preliminary bonding becomes non-uniform reducing deaeration effectiveness
Solution Approach 1:
The invention optimizes the thickness parameter within a specific range (30-200 μm) rather than追求 extreme thinness. This parameter selection balances manufacturability with performance requirements, allowing standard extrusion processes to produce films with adequate thickness uniformity that still achieves excellent deaeration and transparency results.
Data Source
Figure 1(a)~1(b)
AI summary
The present invention aims to provide an interlayer film for a laminated glass, which can exhibit high deaeration properties during preliminary pressure bonding and enables production of a highly transparent laminated glass, a roll, a laminated glass, a method for producing the interlayer film for a laminated glass, and a method for producing the roll. The present invention relates to an interlayer film for a laminated glass, having a large number of recesses and a large number of projections on at least one surface, the interlayer film for a laminated glass having a thickness with a difference between a maximum thickness and a minimum thickness of less than 40 µm at each of a central portion, one end portion, and an other end portion in a width direction that is orthogonal, in the same plane, to a machine direction of the film in production of the interlayer film for a laminated glass, the thickness being measured along 3 m in the machine direction of the film in production of the interlayer film for a laminated glass at the central portion, the one end portion, and the other end portion in the width direction.