Search China Glass: Knowledge of Ethylene-vinyl acetate EVA Interlayer Film for Laminated Glass

Knowledge of Ethylene-vinyl acetate EVA Interlayer Film for Laminated Glass

Hi everybody, I am Peter Shin from China. I have been in EVA FILM industry for many years. As many glass related workers still not believe in EVA FILM, they don't believe that EVA FILM can replace PVB FILM in many fields.

In the same time, EVA FILM has many advantages against PVB FILM.

So i think it's my job to spread EVA FILM knowledge to more people.

If you want to learn more, go to our EVA FILMS' INFO blog: www.evafilms.com

EVA Film:

EVA stands for ethylene vinyl acetate, a copolymer resin used in the production of laminated glass as the interlayer sandwiched between two pieces of glass. The main function of the interlayer is to stick the two piece of glass together, in order to make the sandwiched glass safer and more secure.

EVA Film is made out of macromolecule material and it performs excellent in bonding strength, heat resistance, cold resistance, humidity resistance and tensile strength in laminated glass. It has been partly taking the places of PVB film in laminated safety glass, laminated art glass, laminated color glass.

EVA film is not adhesive before heating. After heating, it melts and reacts. In the production of laminated glass with EVA interlayer, no autoclave, roller press, air bag, or vacuum rubber ring is required. As EVA interlayer can be processed under normal climatic conditions, no clean room with climatic control is required. And the producing machine of laminated glass with EVA Film is less cost and easier to process.

Laminated Glass with EVA Film

Laminated Glass with EVA Film is an important kind of laminated glass in glass industry .The processing principle of EVA laminated glass is similar to most of the laminated glass . Furthermore, using EVA film to laminating glass does not require autoclave. All laminating processing will be finished and completed in one vacuum laminator. EVA Film for laminated glass has excellent transparency, outstanding adhesion and aging-resistance (more than 15 years), can be used for architectural glass, decorative glass with fabric, privacy glass, auto glass etc.

Advantages of EVA film :

- High tensile strength

- Excellent transparency

- Outstanding adhesion

- UV protection

- High impact resistance

- Good temperature withstanding

- Water proof

- Humidity durable

- Long-term reliable (long-term aging resistance)

- Sound barrier

Names of EVA FILM for Laminated Glass

Some will call EVA Film in different name:

-laminated glass eva interlayer

-ethylene vinyl acetate film

-solar eva film

-glass lamination film

-glass laminating film

-laminating film rolls

-lamination film

-safety glass film

-tempered glass film

-security glass film

-glass eva film

-laminate film

-security laminate film

-decorative glass film

-stained glass film

EVA FILM Category

Based on the UV Blocked rate, the EVA FILM can divided into :

Indoor EVA FILM and Outdoor EVA FILM.

Indoor EVA FILM, of course, the UV blocked rate is lower than 50%. So they can only be used inside building.

But how is it going to happen, if I put the indoor EVA FILM laminated glass in outdoor using?

The indoor EVA FILM laminated glass will turn yellow in short period, maybe two years, and bubbles will come out inside the laminated glass, and the EVA FILM will break away from the glass.

For outdoor EVA FILM, the most advanced EVA FILM can absorb 99% of the UV radiation.

But at least the UV radiation should be absorbed more than 85% percent to be implied for outdoor.

Yes, it's not necessary to say but I want to mention that you can use the outdoor EVA FILM for indoor.

Based on the transparence, the EVA FILM can divide into:

Ordinary transparent and super transparent.

Ordinary transparent, of course, means the transparence is good but less than super transparent. Most ordinary transparent EVA FILM is used in laminating with fabric and papers.

And generally speaking, the ordinary transparent EVA FILM are INDOOR EVA FILM. And super transparent EVA FILMs are outdoor EVA FILM.

But because some people need the super transparence but not the UV blocked rate, some EVA FILM manufacturer make the INDOOR super transparent EVA FILM.

Based on colors, EVA FILM can divide into:

-no color transparent

-colored transparent (standard 8 colors in China)

-colored translucent (standard 7 colors in China)

-colored opaque

-Black (transparent, translucent, opaque)

-white (transparent, translucent, opaque)

The standard colors are:

RED/DEEP GREEN/GRASS GREEN/BLUE/LEMON YELLOW/ORANGE YELLOW/PURPLE/PINK

Some companies can customize the color you need. First you offer the samples, and they will adjust the color film samples for you to check. But of course, the cost would be higher. It's different depending the quantity of the color film you want to customize.

Based on thickness, the EVA FILM can divide into:

0.25 mm

0.38mm

0.76mm

Also, the EVA FILM manufacturer can customize the thickness for you.

Common problems of EVA FILM

Following are some common problems the EVA Film may have if the Manufacturer produce bad quality EVA Film.

-Gluing of EVA,

- Mosquitoes

- Black spots

- Holes on EVA FILM

-for colorful EVA FILM, the color is not even.

- Knocked marks

- Yellowing of EVA and etc. …

Gluing of EVA

Which means the two layer of EVA FILM stick together, three reasons can cause it:

(1) The EVA FILM is ultra-transparent film; they are easy to show adhesives. In this situation, put membranes between the two layers of EVA FILM.

(2) The temperature is too high, like the temperature in the container is too high (maybe over 65 degree), which will lead the EVA FILM to melt, and stick together.

(3) The film is too tight when it was produced, this is factory's problem, they should loosen the EVA FILM when The EVA FILM are circling to be a roll.

Mosquitoes

This is about the environment of EVA FILM factory; they should kill pests in workshop, and avoid other mosquitoes to come in.

Black Spots

This is also about producing procedure in EVA FILM factory, the workers should wear gloves or wash hands often, to make sure when they touch the EVA FILM, and their hands are clean.

For colorful EVA FILM, the color is not even

It's about the procuring procedure of EVA FILM; maybe the procedure of mixing the colorant is not good enough.

Knocked marks

This is caused in the transportation. The carrier is not carefully or the EVA FILM is not packaged by wooden boxes.

Yellowing of EVA

It's about the formula of EVA FILM, which means the quality of the EVA FILM is not good. So you should buy small trial order before you make big quantity order when you work with a new supplier.

China's EVA FILM compared to Japan's EVA FILM

Yes, EVA FILM was first implied in Japan, like Bridgestone. At that time, no other countries had used EVA FILM to laminate glass(Maybe i am wrong, welcome to correct me). Yes EVA has been used in others fields, like slipper and insider of cloth etc.

Not many years later, EVA FILM as a hot melt adhesive film was introduced to China. but the quality is not very good at that time.

The EVA FILM is only used in decorative glass. Which mens the safety of EVA FILM is not trusted.

But now in China, the EVA FILM after being modified by lots of times, are in good quality and be trusted in safety properties.

And some European customers change the suppliers of EVA FILM to China suppliers, because EVA FILM in China is inexpensive but at the some quality of EVA FILM in Japan.

As we have compared EVA FILM in China and Japan.

The visible light transmission and ultraviolet light blocked rate are as good as EVA FILM in Japan.

Now the EVA Film is wildly used in Architectural Laminated Glass, Auto Glass, Privacy Glass(Switchable Glass), Safety Glass etc.

And EVA Film perform better is the laminated glass is used in the environment of water, high humidity, chemical substances etc.

China (Ethylene-vinyl acetate)EVA Interlayer Film Manufacturer for Safety Laminated Glass, Smart Glass, Privacy Glass, LED Glass, PV Solar Encapsulationetc.

cnc@cncnext.com / www.cncnext.com

eva@evafilms.com / www.evafilms.com

benext77@gmail.com / benext77@hotmail.com

Monday, July 4, 2011

Knowledge of Ethylene-vinyl acetate EVA Interlayer Film for Laminated Glass