Month: July 2013

Safety Caution of EVA-80 EVA Film Processed at 80 ºC DONOT Cross-Link at all

Safety Caution of EVA-80: EVA Film Processed at 80 ºC DONOT Cross-Link at all

By Peter Lin

There is EVA film for laminated glass that it can be processed at 80 degree ºC .
After we made many tests, we proofed that the EVA film processed at 80ºC don’t cross-link at all.
If the EVA film don’t cross-link at all after heating , how can we trust the laminated glass’s safety properties?

We ran TGA (Thermogravimetric analysis) experiments and see what are the results.
First, we cured a 10x10cm sample of EVA-80 between two glass sheets. The heating profiles were at 80°C-120 minutes.

How do we get the results of gel content test? We weighted a 4x4cm cured EVA and placed in toluene overnight (16 hours). Then the sample was fully dry (one hour in a fume cupboard and one hour in vacuum oven at 100°C) and weighted again. With the weight loss was calculated the amount of gel content.

The first samples we ran (80°C-120minutes) were fully dissolved in the toluene solution overnight. We saw that behaviour before with an EVA thermoplastic, with no cross-linking. So, for our experiments and previous experiences, EVA-80 did not cross-link at all at 80°C during 1.5 and 2 hours.

All our experiments did not show any cross-linking level. After several analyses with different techniques (immersion in toluene and DSC) we got the conclusion that EVA-80 does not cross-link at all. It is just behaving as a thermoplastic. So it is not thermally and chemically stable, both properties are important to safety laminated glass to pass the European certificates for a architectural commercial product.
Hope this is more clear explanation. If you require more information, please feel free to contact us.

All rights reserved by CNC GLASS INTERLAYER TECH:
Product 1]CNC-Force EVA INERLAYER FOR ARCHITECTURAL LAMINATED GLASS
[email protected]
Product 2]CNC-SmartSMART FILM FOR PRIVACY SWITCHABLE GLASS
[email protected]
Product 3]CNC-Shield PVB INTERLAYER FOR AUTOMOTIVE WINDSHIELD GLASS
Web: www.CNCglass.com www.CNCnext.com
Mail: [email protected]
[email protected]

 

De-lamination Solution of Processing Laminated Glass With EVA Film

De-lamination Solution of Processing Laminated Glass With EVA Film
By Peter Lin

General View:
I have talked about the Bubbles Solution for Laminated Class with EVA Film , and today I would like to talk about the other problems you may face in laminating glass with EVA FILM.
The common problems are: de-lamination and self-exposing of the laminated glass.

De-lamination:

1)- The heating temperature is not high enough or the heating time is not long enough for the EVA FILM to melt and react totally, so the cross link reaction is not finished.
For this reason, please increase the heating temperature or prolong heating time of laminating.

2) -The EVA FILM is out of the shelf life, most EVA FILM’s self life is about one year or longer. Please use the EVA FILM within the self life. Yes, different EVA FILM manufacturers may have different self life for the EVA Film.

4)-Maybe it’s the problem of the quality of the EVA FILM. Send some film samples back to the EVA FILM manufacturer to test the EVA FILM again.

5)-The moisture of the glass or EVA FILM is too much. EVA FILM are less sensitive to moisture, but if it’s too high, it will do harm to the adhesion of EVA FILM. Please dry glasses and storage EVA FILM in good way.

6)-There is some organic substance on the surface of glasses. For example oily substance will also do harm to the adhesion of EVA FILM.
Please clean the glasses if necessary. You can use clean water, industrial alcohol, Acetone to clean the glasses.

7)-When laminated with the painting papers (like PP, PVC), the printing ink is too much and not being dried.
Please dry the printing papers first before laminating with glasses and EVA FILM.

8)-If you found the de-lamination is happening in the edges of the laminated glass, here is why:
Maybe the workers’ hand touch the edges of the glasses, and there are oily substance in the hand, which will do harm to the adhesion of the EVA FILM.
Please ask your worker to wear gloves.
Maybe its summer, and your workers work very hard, and their hands are sweaty. And the sweat will do harm to the EVA FILM.

Any other situation, please feel free to contact us.
ALL RIGHT RESERVED BY CNC INTERLAYER TECH :
All rights reserved by CNC GLASS INTERLAYER TECH:
Product 1]CNC-Force EVA INERLAYER FOR ARCHITECTURAL LAMINATED GLASS
[email protected]
Product 2]CNC-SmartSMART FILM FOR PRIVACY SWITCHABLE GLASS
[email protected]
Product 3]CNC-Shield PVB INTERLAYER FOR AUTOMOTIVE WINDSHIELD GLASS
Web: www.CNCglass.com www.CNCnext.com
Mail: [email protected]
[email protected]

De-lamination Solution of Processing Laminated Glass With EVA Film