Why is humidity control critical in glass lamination?

PVB (Polyvinyl Butyral) film is a highly hygroscopic material that rapidly absorbs ambient moisture. When moist PVB film is used, quality defects such as air bubbles, haziness, and delamination occur within the laminated glass. Relative humidity in the production area must be maintained below 25–30%.

What should be the target dew point in a glass lamination room?

The typical dew point target for lamination processes ranges from -5°C to -15°C. Since reaching such low dew points through cooling alone is inefficient, silica gel rotor dehumidifiers are used. Meeting these criteria is a fundamental quality standard requirement, especially in automotive and architectural glass production.

How long can PVB film be used after opening?

Moisture absorption begins once PVB film is removed from its original vacuum packaging. Safe usage time varies depending on ambient humidity, the higher the humidity, the shorter the window. In low-humidity environments controlled with TFT – Italy dehumidifiers, usage time is extended, while in high-humidity environments, degradation begins much more rapidly. Unused film sections should be placed in moisture-barrier PE bags and stored in an airtight manner.

What is the difference between silica gel rotor and condensation dehumidifiers?

TFT – Italy condensation (compressor-based) dehumidifiers condense moisture by cooling air below its dew point; they can reach a minimum of approximately 40% RH. TFT – Italy silica gel rotor (desiccant) dehumidifiers use hygroscopic materials and can reach 10–15% RH values. For glass lamination applications requiring low humidity, such as the PVB line, silica gel rotor systems are mandatory.

How often should humidity calibration be performed in a clean room?

Humidity sensor calibration should be performed every 6 months. For high-precision applications (e.g., when operating near the 0.4% PVB moisture content threshold), a 3-month interval is recommended. After each calibration, a certificate should be issued and linked to production quality records.

Is a clean room also required for SGP interlayer?

Although SGP has lower moisture sensitivity compared to PVB, clean room conditions are recommended for professional production quality and ISO 12543 standard compliance. NKT designs specialized climate-controlled cabinets and dry cabinets equipped with TFT – Italy dehumidifiers for SGP processing.

What is the optimal humidity range for my production line?

For standard automotive or architectural glass lamination lines working with PVB, the ideal range is 20–35% RH, 18–22°C. Dropping below 20% RH can increase PVB's electrostatic charge, causing dust attraction. Rising above 35% triggers adhesion problems. Therefore, a target band of 25–32% RH offers the optimal balance for most laminated glass manufacturers.

Can I retrofit a TFT – Italy dehumidifier to my existing lamination room?

Yes, retrofitting to existing lamination rooms is possible. The NKT engineering team evaluates the existing facility's dimensions and ventilation infrastructure to determine the most suitable installation configuration and duct system design for TFT – Italy industrial dehumidifiers.

How is a dedicated dry cabinet designed for SGP?

NKT manufactures dry cabinets and climate-controlled cabinets specifically designed for the opening, cutting, and placement of SGP interlayer material. These cabinets are equipped with TFT – Italy compact dehumidifiers and provide a controlled environment of 10–20% RH inside the cabinet. Cabinet design is customized according to material dimensions and production line configuration.

Which standards apply to glass lamination production?

The main reference standards are EN ISO 12543-1:2021 (general definitions), EN ISO 12543-2 (test methods), EN ISO 12543-4 (moisture resistance), ISO 14644-1:2015 (clean room classification), ASTM E1305 (PVB moisture content test method), and EN 356 (security glass attack resistance classes).

Technical Article28 min read

Humidity Control in Glass Lamination: The Key to Quality

Laminated glass is a special type of glass preferred in many applications due to its safety and performance characteristics.

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Related Glossary Terms

For deeper definitions of the technical concepts in this article, browse the related entries in the NKT Glossary:

Relative Humidity (RH)Moisture Content (Specific Humidity)Moisture Load Dew Point Silica Gel Rotor (Desiccant Rotor)Adsorption Infiltration Calibration ACH (Air Changes per Hour)HEPA Filter (High-Efficiency Particulate Air)ISO 14644 (Cleanroom Classification)Sorption (Adsorption + Absorption)PVB (Polyvinyl Butyral)Silica (SiO₂)Filtration (Water Filtration)Humidity Sensor

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