How many production methods are there for laminated glass？
Laminated glass can be produced using two different methods: dry lamination and wet lamination. The most widely used method for industrial production is the dry method, which involves using PVB film as the interlayer.
Dry lamination involves using solid PVB film as the interlayer between two or more layers of glass. The assembly is then placed in an autoclave for hot pressing. This method is commonly used for industrial production.
On the other hand, wet lamination involves mixing and curing liquid glue. There are two methods of wet lamination: heating and baking in a special furnace or using ultraviolet light to cure the adhesive. The former method has a much lower bubble generation rate than the latter.
What is the difference between the two production methods？
Dry laminated glass
The production process of dry laminated glass involves multiple steps to ensure the final product meets the required specifications. Firstly, the glass is cut, cleaned, and processed to remove any impurities affecting the bonding process.
Next, the glass is assembled with the PVB interlayer film in a room that meets process requirements. The PVB interlayer film is placed on top of the glass, and another piece of glass is placed on top.
After that, the bonded glass is pre-pressed and exhausted to discharge residual air between the glass and PVB interlayer interface. This step is usually done using mechanical equipment to ensure that the air pockets are removed and the edges are sealed.
Finally, the assembly is treated with constant temperature and high pressure in an autoclave to bond the PVB film and glass. This step is the last process in the production of laminated glass. Before it can be used, the preheated and pre-pressed glass must undergo constant temperature and high-pressure treatment to ensure better adhesion between the PVB film and glass. This process ensures that the final product is high quality and meets industry standards.
Wet laminated glass
The wet lamination production process involves the following steps: transporting the processed glass sheet to the inspection table, then sending it to the lamination table after passing inspection. The sticky film strip is manually applied to the edge of the first glass piece, and another part of the glass is placed on top. A roller press then pressurizes the assembly to remove gas and bond the glass to the film strip. Pneumatic clamps firmly clamp the two pieces of glass and the film strip between them on the injection table, and a pre-prepared organic chemical raw material slurry is injected. Next, the assembly is transported to the ultraviolet polymerization station, where it undergoes rapid polymerization under ultraviolet light. After polymerization, the assembly is transported to the unloading station, where it undergoes an inspection and becomes a finished product if it passes.
Conclusion
In summary, dry lamination is the predominant manufacturing method for architectural laminated glass. Unlike wet lamination, dry lamination is better suited for mass production and offers higher product strength, minimal optical distortion, and stable quality. On the other hand, wet lamination results in poor transparency and uneven glue layer thickness, leading to a shorter production life. Understanding these two processes can enhance our knowledge of laminated glass. Follow us to learn more about glass technology.
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