Laminated Glass Interlayer Recess Geometry for Parallel Deaeration
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Solution Overview
Problem
In the vacuum deaeration method for producing laminated glass, performing deaeration for preliminary pressure bonding and heating for final pressure bonding in parallel often results in insufficient air removal, leading to air bubbles and reduced visible light transmittance due to 'preceding sealing' caused by the crushing of recess shapes in interlayer films with engraved lines.
Innovation Solution
The interlayer film for laminated glass features recesses with a texture aspect ratio (Str) of 0.04 or lower, ensuring regular shapes and preventing blockage, thereby preventing preceding sealing and maintaining high visible light transmittance even when deaeration and heating are performed concurrently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If deaeration for preliminary pressure bonding and heating for final pressure bonding are performed in parallel to shorten process duration, then productivity is improved, but air bubbles remain in the laminated glass reducing visible light transmittance due to preceding sealing
Solution Approach 1:
The recesses are pre-formed on the interlayer film surface before lamination, creating predetermined air escape pathways. This preliminary structural preparation ensures that during parallel deaeration and heating, air can escape through these pre-designed channels before the resin softens and seals the layers, preventing air bubble entrapment even when processing steps occur simultaneously
Solution Approach 2:
The invention controls the texture aspect ratio parameter (Str) of the recesses to be 0.04 or lower, optimizing the geometric parameters of the recess structure. This parameter control ensures the recesses maintain their shape at processing temperatures, preventing groove blockage and maintaining effective air escape pathways during parallel deaeration and heating operations
2Reliability
If recesses with engraved lines are formed on the interlayer film to ensure deaeration properties, then deaeration capability is improved, but the recess shapes are crushed during heating causing preceding sealing and insufficient air removal
Solution Approach 1:
The invention optimizes the texture aspect ratio (Str) parameter to 0.04 or lower, creating recesses with specific geometric characteristics that resist deformation. This parameter optimization ensures the recesses maintain their structural integrity during heating to processing temperatures (e.g., 90-110°C), preventing the groove shape crushing that leads to preceding sealing while preserving effective air escape pathways
Solution Approach 2:
The recesses are pre-formed with optimized dimensions and shapes before the lamination process. This preliminary structuring creates air escape channels that are dimensionally stable and pre-positioned to function effectively during heating, ensuring air can escape before the resin softens and seals the laminate, even when deaeration and heating occur in parallel
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 interlayer film with a low texture aspect ratio effectively prevents preceding sealing, ensuring high visible light transmittance in laminated glass produced using the vacuum deaeration method, even when deaeration and heating are done in parallel, by maintaining regular recess shapes and preventing groove blockage.
Implementation Method 1
a laminate including an interlayer film for a laminated glass interposed between at least two glass plates is placed in a rubber bag, and vacuum suctioned for removal of air remaining between the glass plates and the interlayer film so as to be preliminarily pressure bonded
Implementation Method 2
The laminate is then pressurized with heat, for example, in an autoclave for final pressure bonding to provide a laminated glass
Data Source
AI summary
The present invention aims to provide an interlayer film for a laminated glass that enables production of a laminated glass having high visible light transmittance even when deaeration for preliminary pressure bonding and heating for final pressure bonding are performed in parallel in a vacuum deaeration method. The present invention also aims to provide a method for producing the interlayer film for a laminated glass, and a laminated glass including the interlayer film for a laminated glass. Provided is an interlayer film for a laminated glass having a multitude of recesses on at least one surface, the surface with the recesses having a texture aspect ratio Str of 0.04 or lower as measured in conformity with ISO 25178.