Glass Materials in China

Delamination in edges and holes of laminated glass with Polyvinyl Butyral PVB interlayer film

Reason:The plainness of the edges and holes of the tempered glass is not good.
Solution: Adjust he plainness of the tempered glass, clip the edges of the pre-laminated glass before putted into the autoclave. But  don’t use too big clips, in case the pvb film’s shape changes.
Reason: Delamination after the laminated glass is installed in the building.
Solution: Install the laminated glass gently. it’s better if use the wrench with scale to hole the laminated glass. Make sure the glass glue is suitable for the laminated glass, and it should be neutral glue.

Irregular Delamination of laminated glass with Polyvinyl Butyral PVB interlayer film
Reason1: The Adhesion of Polyvinyl Butyral PVB interlayer film and glass is not strong.
Solution1:The washing glass water is not good quality, it’s better use the water whose electric conductivity is lower than 20us.
Solution2: The Polyvinyl Butyral PVB interlayer film absorbed too much moisture, maybe more than 6%. If moisture of Polyvinyl Butyral PVB interlayer film is higher than 1%, the laminated glass may appers white haze.
Solution3: The combination of pre-laminated glass and roller exhausting air stage maybe not operate correctly, which lead to Polyvinyl Butyral PVB interlayer film not reacted perfectly. The main parameters are temperature, pressure and time.
Solution4： The glass surface is not clean and dry enough.
Reason2: The Polyvinyl Butyral PVB interlayer film is too thin.
Solution: Use thicker or more layer of Polyvinyl Butyral PVB interlayer film.
Reason3: The plainness of hte tempered glass is not good.
Solution: Choose better quanlity tempered glass.

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High-pressure Molding of PVB Interlayer Film

+Maintaining Pressure Stage:
The temperature and pressure are very important parameters for making  laminated glass successfully. When the temperature and pressure reach to the setted point (like 120-140 degrees), pay attenthion to these two parameters carefully. If the temperature is lower than  130 degree, the pressure time should be  longer.But if the temperature is lower than 120 degree, it’s not helpful to keep the pressure time longer. And the laminated glass may be not adhensive or not very strong. If the pressure is less than 1.2-1.4MPA, the time for pressure should be longer, but at the same time, the temperature should be 120-140 degrees. If the temperature is higher than 160 degree, the pvb interlayer film will turn yellow. And the laminated glass is failure.

+ Cooling with pressure stage
After the maintaining pressure stage, it’s time to cooling the laminated glass. Still maintain the pressure and open the cooling water to reduce the temperature. When the temperature reaches 45 degree, strat to reduce the pressure. When open the autoclave door, check the temperature of the laminated glass up and down, make sure the temperature of the laminated glass is even. Don’t reduce the pressure too early, otherwise the bubbles would apper on the edges of the laminated glass.

If you need any help in China to find the informations of glass lamination materials,  products, manufacturers, Suppliers, Offers, Please feel free to contact us, we will answer you in 24hours.
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China GlassHepls Service Center of Glass Materials Purchase

High-pressure Molding of PVB Interlayer Film

The Pre-laminated glass have went through the Preheating and Exhausting Air procedure, but the whole pre-laminated glass still have air inside the laminated glass. In order to finally melt the PVB Interlayer film and exhausting all the air out, the pre-laminated glass should be put into the higher pressure laminating autoclave.

There are three steps:

+Heating

Put the pre-laminated glass vertically on the bracket, make sure the space between the two pre-laminated glass is equal, so each pre-laminated glass will get the same pressure. Make sure the pre-laminated glass not touch the mentl part of the machine, to prevent the part of pre-laminated glass get too high temperature and break out. Close the autoclave and start heating. After the temperature rise up to 50 degree, Increase the pressure inside the autoclave. It’s suggested that the speed of increasing pressure and temperature is :0.06MPA/MIN and 5 degree/min. If the temperatue and pressure is not synchronous, please adust the machine. If temperature is too fast, then stop increasing the temperature untill the pressure catch up, vice versa .

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China GlassHepls Service Center of Glass Materials Purchase

Polyvinyl Butyral PVB interlayer film Vacuuming exhausting air

This method is specially for laminating uneven glass with pvb interlayer film, such as automobile windshield glass, bending glass.

Put the prelaminated glass into a vacuum bag or put vacuum rubber ring to seal the glass, then start the vacuum pump.

The procudure is divided into two steps: cold vacuuming period and hot vacuuming period. In the cold vacuuming period, the temperature is about 25 degrees and holding time about 15 minutes, and the negative pressure should be at least 0.8 bar. In the hot vacuuming period, temperature is about 80-110degrees, and holding time about 30 minutes.

And the most suitable temperature and time of hot vacuuming exhausting air depends on the machine and producing speed.The transparency of the laminated glass is better if it’s made of the hot vacuuming exhausting air method.

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China GlassHepls Service Center of Glass Materials Purchase

Preheating and exhaust of pvb film

After the glass and pvb interlayer film is combined, there are some air between the pvb interlayer film and the glasses. PVB Interlayer Film can dissolve some of air by itself, but not very much of it. To extrude the air out, here are the methods:

+hot roller extrude exhausting air

Hot roller exhausting air has many ways: single thermostat chamber with double rollers or double thermostat chanbers with double rollers.

Single thermostat chamber with double rollers: usually for laminating flat glass with pvb interlayer film. When prelaminated glass goes through the frist roller, most of air will be squeezed out. Then the prelaminated glass goes into the thermostat chamber to heat, then, go throug second roller to extrude exhaust after heating. At this most, air isolation and edge seal is finished at the same time, the pre-laminated glass looks prey translucent while the narrow erea around edge shows transparent.

The temperate control is very important, in order to expulsion of air and seal sides of prelaminated glass successfully, temperature should be kept about 70-80 degree after going through the second roller.

If you doesn’t find the prey translucent area after the second rolling, which means the glass temperature is too low. On the contrary, if the temperature is too high, edges of the prelaminated glass will be sealed too early, which will stop squeeze air out, then bubbles will appears in the laminated glass.

If you need any help in China to find the informations of glass lamination materials, products, manufacturers, Suppliers, Offers, Please feel free to contact us, we will answer you in 24hours.

Mail: helps@glasshelps.com

China GlassHepls Service Center of Glass Materials Purchase