Solution of bubble problem in EVA film laminated glass production

1. It is too early to stop the vacuum pump, and the vacuum pumping is stopped before the temperature drops below 50 ℃. At this time, the EVA film is still flowing, and the air is easy to enter the glass again to form bubbles.

The solution is to stop vacuuming when the temperature drops below 50 ℃.

2. When the temperature of the silicone bag tray is still very high, put the glass into it. If the temperature of the bottom plate of the silicone bag is still above 60 ℃, the temperature in the bag will rise too quickly, and the EVA film at the edge of the glass will melt quickly. If the gas is sealed in the glass, it is easy to produce bubbles.

The solution is to lower the temperature of the bag below 50 ℃ when putting down a furnace of glass, or push the vacuum bag into the furnace for heating after cold vacuuming outside the furnace for about 15 minutes.

3. If there is no pre vacuum, the temperature will rise directly. If there is no pre vacuum, the temperature in the bag will rise too quickly. The EVA film at the edge of the glass will melt quickly. If the gas is sealed in the glass, it is easy to produce bubbles.

The solution is to pre vacuum for about 15 minutes before pushing the silicone bag into the furnace to start heating.

In addition, the reason for the generation of bubbles is determined from the location where the bubbles appear:

● bubbles appear at four peripheral parts:

1 stop vacuuming when the temperature is above 60 ℃, and the air will enter the glass with the flow of glue;

2. The processing temperature is too high, and the amount of glue at the edge overflows too much, and the amount of glue at the edge becomes thin and bubbles appear, especially when the intermediate material is sandwiched;

3 if the sealant corrodes the film, similar bubbles will appear around the glass.

● bubbles appear in the middle of the glass:

1. The furnace heats up quickly, and the film at the edge of the glass melts first, sealing the glass, and the air cannot be discharged to form bubbles;

2 the film used for toughened glass is too thin, and the uneven place cannot be filled by the amount of glue to form bubbles;

3. The gap of decorative materials is large, and the film is too thin, and the amount of glue cannot be filled to form bubbles;

4 when the temperature is too high, the film becomes thin and bubbles appear, especially when the intermediate material is sandwiched.

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