The Manufacturing Process For Laminated Auto Glass
Posted on February 9, 2013
Laminated Glass autoclave is used in a variety of industries throughout the world. But the one industry that has benefited the most is the automobile industry. The multi-layered glass is one of an automobiles primary safety devices. It ranks right up there with the seatbelt; possibly higher. Laminated windshields are probably the most significant improvement in the auto industry since cars were first manufactured.
There are three structural layers to laminated Glass autoclave. Two of those layers are everyday normal sheets of glass. What makes laminated glass unique is the third layer: an ultra thin sheet of substrate that is sandwiched between the two large pieces of glass. The two pieces of glass (which are first cut to size prior to adhering the substrate) must be thoroughly cleaned before the substrate can be applied. There can’t be any dust or other foreign materials on the glass because it could hamper the structural integrity of the final product. Additionally, any foreign material that gets caught between the two pieces of Glass autoclave manufacturer could ultimately obscure the driver’s vision.
Only after each piece of glass is spotless will the substrate be adhered to the surface are of the Glass autoclave. Exactly what is a substrate? Well, it’s a thin layer of plastic, at least that’s the simple description.
The early form of substrate was cellulose-based. However, it was eventually realized that this type of substrate will darken the more it is exposed to the sun’s rays, which isn’t a good effect for any windshield as it will hamper the driver’s vision. The most common used substrate today is Polyvinyl Butyral. It is referred to by its abbreviation – PVB. There two other types of less common substrates. They are Polyurethane and Ethylene Vinyl. Attempts have been made at using liquid substrates, but the added cost of hardening the liquid with chemicals or by blasting it with UV rays makes liquid substrates an uneconomical solution.
The substrate can only be applied to the Glass autoclave supplier in a climate controlled room in order for it to adhere properly. Temperature and humidity play a large role in whether or not the substrate will properly bond to the sheets of glass. While it may seem hard to believe, the substrate is actually applied by hand! Once the substrate is glued to the first sheet of Glass autoclave, the second sheet will be laid on top of it. Any excess substrate will then be trimmed from the edge of the glass sandwich. The auto industry only requires three layers of material: two sheets of glass and one layer of substrate in between. Other industries require additional sheets of Glass autoclave manufacturer and substrate, but for autos, three layers are sufficient.
Air bubbles are problem when creating laminated glass, and they can’t be avoided no matter how perfect the layering process is performed. To get rid of the bubbles, the laminated Glass autoclave will be heated and then press rolled by a giant roller. The roller forces the bubbles of air to the edge of the glass where it is then released. The heating and rolling process may need to be continued many times before the air bubbles are completely removed.
That last step for laminated Glass autoclave manufacturer creation is to place the glass into an autoclave. The extreme heat will then further bond the substrate to the glass. This process takes several hours – the windshield must remain in the autoclave for the entire time. During the heating and rolling process and the autoclave process, some excess substrate will form at the edge of the Glass autoclave. It will need to be removed.
After a windshield is removed from the autoclave, it is inspected one last time for any imperfections. At that point, it’s ready to be shipped to the various car manufacturers around the world!
Written By: sunny