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Moisture Problem in Safety Glass Manufacturing - Making Safety Glass Safer

Moisture problem in glass lamination

“Safety Glass” is essential for automobile and construction industries. Safety glass is safe because it does not shatter on impact. The safety element consists of a special bonding between layers of glass with a flexible PVB (polyvinyl butyral) inter-layer film. It holds the shattered glass together in the event of breakage. The fragmented glass does not scatter, thus, protects the user from any kind of injuries. The safeness and transparency of the glass firmly depends upon the preciseness of its manufacturing process. Manufacture of safety glass includes various processes including washing and drying, assembling, roller press, heating oven and autoclave. Among all the processes, assembling is the key process, affecting the quality of the glass.


Once the washing and drying is over, the glass is then transported to assembling area (clean room), where the PVB film rolls are stored and all assembling of safety glass is done. PVB films being hygroscopic in nature, tends to absorb moisture during the storage and assembling process. During storage and assembling process, if the film is allowed to absorb moisture, then moisture vaporizes during the auto claving process and gets trapped between the layers of glass, as bubbles of moisture. The trapped moisture reduces the visibility of the glass and the effectiveness of the bond between the two layers of glass, rendering the product unsafe. Therefore, it gets essential to maintain a correct relative humidity of the ambient air, where PVB film rolls are stored and assembled.


PVB Storage Conditions:

Maintaining a perfect PVB stoareg conditions has become an important requisite for glass manufacturers. The relative humidity in the glass lamination area should be maintained at 20-22% RH at 70°F (20°C) to ensure that the PVB films does not regain moisture. The temperature control is not critical but should be in the comfort level for workers.


Bry-Air solution to moisture problem in glass lamination:

The solution lies in dehumdification of your assembling and storage are. Bry-Air dehumidifiers can effectively maintain the exact condition i.e. 20-22% RH 70°F (20°C), which is required in the process of manufacturing safety glass. Bry-Air dehumidifiers flawlessly control the humidity at low temperature to prevent hygroscopic PVB films from regaining moisture. This improves the quality of your product ensuring the clarity of glass, hence making safety glass safer for the consumers. Undoubtedly, Bry-Air dehumidifiers have always been a matchless choice among all safety glass manufacturers.


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