Glass Laminating Process
PVB/SGP Interlayer Lamination - Core Process for Safety Glass
Process Overview
Glass laminating bonds two or more lites of float/tempered glass with PVB (Polyvinyl Butyral) or SGP (Ionomer) interlayer in a controlled cleanroom environment. After precise alignment, pre-pressing and deairing, the assembly enters an autoclave where thermal bonding is completed under high temperature and pressure, creating an integrated safety laminated glass unit.
When broken, glass fragments remain adhered to the interlayer, preventing spall and injury. Laminated glass is widely used in architectural curtain walls, automotive windshields, ballistic-resistant glass, acoustic glass, railings and skylights.
Core Capabilities
Precision laminating process for high-quality safety laminated glass
Precision Alignment(±0.5mm)
PVB/SGP/EVA Multi-Interlayer Compatibility
Autoclave Thermal Bonding(12bar/140°C)
Fully Automated Laminating Line
Oversize Panel Support(3300×6000mm)
Class 10000 Cleanroom
Equipment
Automated Laminating Room
Class 10000 clean environment, auto alignment system
Autoclave
12bar/140°C precision temp control, 10×3m capacity
PVB Film Laying Table
Constant temp & humidity, auto cutting & laying
Pre-press Roller
Precision roller deairing, initial bonding positioning
Glass Washing & Drying Machine
Ultra-pure water wash, hot air drying, cleanliness inspection
Technical Specifications
| Property | Value |
|---|---|
| Alignment Accuracy | ±0.5mm |
| Max Panel Size | 3300×6000mm |
| Interlayer Thickness | 0.38-2.28mm(PVB)/0.89-2.28mm(SGP) |
| Glass Thickness | 3-19mm per lite |
| Autoclave Parameters | 12bar/140°C/3h |
| Annual Capacity | 300,000㎡ |
FAQ
What is the difference between laminated and tempered glass?
Tempered glass is a single glass with surface compression from rapid cooling, breaking into small granular pieces. Laminated glass bonds two or more glass lites with PVB (Polyvinyl Butyral) or SGP (Ionomer) interlayer through heat and pressure. When broken, glass fragments remain adhered to the interlayer, preventing spall and injury, providing higher safety. Laminated glass also offers additional benefits like sound insulation, UV protection, and ballistic resistance, making it the preferred choice for architectural curtain walls, automotive windshields, security glazing, and more.
How to choose between PVB and SGP interlayer?
PVB (Polyvinyl Butyral) is the most commonly used interlayer, offering excellent adhesion, clarity, and impact resistance, suitable for most architectural and automotive applications, with thickness range 0.38-2.28mm. SGP (Ionomer) interlayer provides higher strength and better tear resistance, ideal for oversized panels and high-security applications, with thickness range 0.89-2.28mm. Our technical team will recommend the most suitable interlayer solution based on your specific application, safety requirements, and budget considerations.
What thicknesses are available for laminated glass?
Individual glass thickness ranges from 3-19mm, which can be combined into various total thicknesses: 3+0.38+3mm (standard architectural), 4+0.76+4mm (automotive windshield), 5+1.14+5mm (high security), 6+1.52+6mm (curtain wall), 8+2.28+8mm (ballistic grade), and more. We can also customize multi-layer structures according to customer requirements, such as 3-layer, 4-layer, 5-layer glass, with total thickness exceeding 50mm for special security, acoustic, or ballistic applications.
Can laminated glass be cut after lamination?
Laminated glass cannot be cut or drilled after lamination, as this would destroy the interlayer adhesion and cause glass delamination. Therefore, all cutting, drilling, and edge working must be completed before lamination. Our process flow is: Glass cutting → Drilling → Edge working → Washing & drying → Lamination → Pre-press & deairing → Autoclave thermal bonding → Quality inspection → Packaging & shipping. Our engineering team provides detailed process guidance at the quotation stage to ensure your design completes all necessary mechanical working before lamination.
How effective is laminated glass for sound insulation?
Laminated glass offers excellent sound insulation performance. Single-pane ordinary glass provides about 25dB sound insulation, while standard laminated glass (3+0.38+3mm) achieves over 32dB, and thick-film laminated glass (such as 8+2.28+8mm) can exceed 40dB. By adjusting interlayer thickness, glass thickness, and glass combinations, we can optimize sound insulation performance for different frequency ranges. For professional acoustic applications, we provide sound insulation calculation and design services to ensure meeting your acoustic requirements, suitable for hotel rooms, recording studios, equipment rooms, conference rooms, and other locations requiring high sound insulation.
Ready to Start Your Project?
Our technical team is ready to provide professional glass laminating consultation and custom solutions