How is Laminated Glass Made?

Laminated Glass, also known as Sandwich Glass, is a special type of safety or security glass that holds together in the event of breaking. When shattered, it is held in place by the interlayer between its two or more layers of glass sheets, typically of PVB, EVA or TPU. Due to this specialty, laminated glass is commonly considered as a durable, high-performance glazing product that can be used in windows, doors, skylight glazing and automobile windshields, thus providing protection against man-made threats or natural disasters such as hurricanes, bomb blasts and so on. Besides, it can also be used to increase the sound insulation rating of the window, thus significantly improving sound attenuation compared with monolithic glass panes of the same thickness.

Many different types of glass sheet can be used to make laminated glass, such as ordinary glass, float glass, tempered glass, colored glass, heat-absorbing glass or heat-reflecting glass etc. The layer quantity can be 2, 3, 5, 7, or up to 9. And for double-layer laminated glass, the common thickness combination of glass sheet is 2 + 3, 3 + 3 and 3 + 5 (mm).

And here comes the question: how to manufacture qualified laminated glass?

• Cut the glass into required shapes and sizes as designed.

• Glass sheets conveyed to washing machine in order to achieve properly clean state, and the wider gaps between are automatically minimized.

• Thoroughly dry the glass panes with the help of automatic machine.

• Put the first dry, clean glass sheet horizontally to allow the plastic film to be applied, on which the second sheet of glass will then be put on top to create a sandwich.(For PVB film laminated glass, glass sheets shall be transferred to a specific dust free room with conditioned temperature and humidity environment)

• The sandwich will then be placed in special silicone bags and then into the lamination oven. Glass sheets will be pressed together to eliminate air bubbles inside with the help of pump.

• Then temperature will be increased to melt the film, so that glass sheets can be bonded together. The heating times vary based on different recipe and thickness.

• After the heating and pressing procedure is finished, the glass sheets will then undergo the last step-waiting to cool outside of the oven.

The final product after the above several steps shall be of high quality laminated glass with its unique characristics and can be widely used for safety/security use, noise reduction, UV protection,solar control, blast mitigation or hurricane resistance.