Analysis of the Reasons for the Delamination of Laminated Glass and Preventive Measures

I. Reasons Analysis
A. Raw Material Factors

1. Improper Surface Treatment of Glass
   If there are impurities such as oil stains, dust, and water stains on the surface of the glass, it will impede the effective bonding between the interlayer and the glass, reduce the bonding force, and thus lead to delamination.
2. Quality Issues of the Interlayer
   The performance of the interlayer is crucial to the bonding quality of laminated glass. If the bonding performance of the interlayer is not good, its aging performance is poor, or it is contaminated and affected by moisture during the storage process, it may cause the delamination of laminated glass. For example, if the PVB interlayer does not pay attention to moisture prevention during storage and absorbs too much moisture, its bonding performance will decrease.

B. Processing Technology Factors

1. Inadequate Cleaning and Drying
   Before glass processing, if the drying is not sufficient after cleaning, and there is residual moisture on the glass surface, the moisture will vaporize and form bubbles during the lamination process, affecting the bonding between the interlayer and the glass, and thus to delamination.
2. Improper Lamination Process Parameters
   The lamination temperature, pressure, and time are key parameters affecting the bonding quality of laminated glass. If the temperature is too high or too low, the pressure is insufficient, or the time is too short, the interlayer may not bond firmly with the glass, resulting in delamination. For example, if the lamination temperature is too low, the interlayer cannot melt sufficiently and cannot fit closely with the glass.
3. Environmental Factors
   The temperature and humidity of the production environment also have an impact on the bonding effect of laminated glass. If the environmental humidity is too high, the glass surface and the interlayer will absorb moisture, affecting the bonding; if the temperature is too low, the fluidity of the interlayer will deteriorate, which is not conducive to bonding.

C. Usage Environment Factors

1. Long-term Exposure to Harsh Environments
   When laminated glass is installed outdoors and exposed to harsh environmental factors such as direct sunlight, high temperature, high humidity, and sandstorms for a long time, the interlayer will gradually age, and its bonding performance will decline, to delamination. For example, in a high-temperature environment, the molecular structure of the interlayer may change, reducing its bonding force with the glass.
2. Subjected to External Impact
   During the use of laminated glass, if it is subjected to large external impacts, such as earthquakes and collisions, it may damage the bonding interface between the interlayer and the glass, causing delamination.

II. Preventive Measures

A. Raw Material Control

1. Glass Surface Treatment
   Before processing, strictly clean and dry the glass surface to ensure that there are no impurities such as oil stains, dust, and water stains. Special glass cleaning agents and dryers can be used to ensure that the glass surface is clean and dry.
2. Quality Inspection of the Interlayer
   Purchase interlayers with qualified quality and conduct strict quality inspections on each batch of interlayers, including testing of bonding performance, thickness, moisture content, and other indicators. At the same time, pay attention to the storage conditions of the interlayer, and store it in a dry and ventilated environment to avoid moisture and contamination.

B. Optimization of Processing Technology

1. Cleaning and Drying Process
   Optimize the glass cleaning and drying process to ensure that the glass surface is thoroughly dried after cleaning. The concentration, temperature, and cleaning time of the cleaning solution can be controlled, and parameters such as the temperature and wind speed of the dryer can be adjusted to improve the cleaning and drying effect.
2. Optimization of Lamination Process Parameters
   According to the characteristics of the interlayer and glass, reasonably adjust the lamination process parameters. Through experiments and inspections, determine the lamination temperature, pressure, and time, and operate strictly in accordance with the process requirements. At the same time, regularly maintain and calibrate the lamination equipment to ensure the stable operation of the equipment and the accuracy of the parameters.
3. Environmental Control
   Keep the temperature and humidity of the production environment stable. Generally, the temperature should be controlled at 20 - 25℃, and the humidity should be controlled at 40% - 60%. Equipment such as air conditioners and dehumidifiers can be installed to adjust the temperature and humidity of the production environment.

C. Usage and Maintenance

1. Reasonable Selection of the Installation Location
   When installing laminated glass, try to avoid installing it in locations that are exposed to harsh environments for a long time. For laminated glass used outdoors, measures such as sunshade and heat insulation can be taken to reduce the impact of direct sunlight and high temperature.
2. Regular Inspection and Maintenance
   Regularly inspect the laminated glass to check for defects such as delamination and cracks. If problems are found, timely measures should be taken for repair or replacement. At the same time, avoid the laminated glass from being impacted by external forces, and set up protective facilities around it to prevent collisions.