Characteristics of the product
Laminated glass refers to two or more sheets of glass attached to each other by one or more layers of film. It is a high security type of glass as film layers will prevent pieces of glass to fall over when broken. Even though both of glass are broken, the glass will not fall down. This is because fractures of two broken glass will definitely be dissimilar causing the glass to have less chance of falling out compared to other types of glass.
All types of glass can be transformed into laminated glass, no matter what process of glass production is. Plate glass, sheet glass, float glass, any color or level of thickness of glass, reflective glass, mirror, tempered glass and heat-strengthened glass can all be manufactured into laminated glass. Bringing different kinds of glass to be raw materials for producing laminated glass results in the glass with special properties which may not be able to produced with one sheet of glass.
In general, a sort of film applied in the production of laminated glass is called PVB (Polyvinyl Butyral Film). Film producers have been doing research and developing it constantly; thereby, PVB film has diverse properties and different shades of colors to select from. These also include transparency, translucence, and opaqueness such as transparent film, yellow film, blue film, white film, black film, and frosted film. These films can be combined together to form new colors or different levels of opaqueness depending on imagination.
PVB film is highly resistant to UV radiation which generally can prevent UV radiation more than 95%. Numerous PVB films can prevent 99% of UV radiation, some of them can completely obstruct UV radiation. When used together with glass which is partly UV protective, laminated glass can prevent almost 100% of UV radiation. PVB film is a type of polymer, wherefore it allows laminated glass to reduce transmission of sound waves to certain extent. It is noted that the frequency of spoken sounds level will be decreased more than infrasonic sound from machines.
Regardless of how laminated glass with a PVB film in the middle can decelerate thermal transfer, when film’s temperature rises to a certain point, heat will ultimately be delivered into the room.
Besides PVB film, there is also EN film or EVA film (Ethylene Vinyl Acetate Film). This particular film can attach glass along with other types of materials such as paper, cloth, mulberry paper, and different kinds of plastic films. This film does not absorb humidity, laminated glass produced with this film therefore can be manufactured in a normal clean room without the necessity of humidity control.
Sentry Glass Plus (SGP) is a special film with features of attachment and high pressure resistance; using this film will reduce the thickness of laminated glass. Besides, Sentry Glass Plus (SGP) absorb humidity extremely slow. Laminated glass with SGP therefore can be used in humid or splash areas, however it cannot be applied in the area that SGP film will constantly contact with water.
Using special type of resin is the traditional method to manufacture laminated glass before using PVB film. The procedure still exists at the present as it does not require costly investment, yet it wastes time as it is slow to produce and difficult to control its thickness.