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EVA solar photovoltaic battery encapsulation film


The company imported eight EVA production lines from Italy, as well as a complete set of European EVA process technology. The annual output is 120 million square meters. 

The production description:

Solar photovoltaic cell encapsulation film is heat extrusion film with the main material EVA(Ethylene Vinyl Acetate) and various additive. The film is non-viscosity at normal temperature, is easy for cutting and splitting operation. At present the film is used for encapsulation of solar battery panels. Firstly, cutting the required film size, and composite in alumium alloy frame by the procedure glass--film--battery panel-film- back panel; Secondly, placing in the lamination machine for heating--pressurizing--vacuumize; Finally, placing in the setting temperature curing oven for constant temperature in a period time. 

Product characteristics

A: High light transmittance

B: Reasonable cross linking index

C:Excellent anti-ultraviolet and anti-thermal aging performance

D: Very low shrinkage rate

E: Strong adhesive performance

F:Excellent anti-PID performance


Product specification:

Width: 200-2100mm

Thickness: 0.3-0.8 μm


Technical Parameter

No

Inspection item

Test standard

Unit

Test index

1

Vinyl acetate content

GB/T 29848-2013

Weight distribution%

28-32

2

·        Light transmittance

GB/T 2410-2008

%

≥91

3

cross linking index

GB/T 29848-2013

%

≥85

4

Tensile strength

GB/T 13022-91

MPa

≥18

5

Elongation at break

%

≥500

6

Peel strength

EVA/glass peel strength

GB/T 2790

N/cm

>60

EVA/back

panel peel strength

N/cm

>50

7

Shrinkage

GB/T 29848-2013

%

<3.0

<1.5

 

8

Breakdown voltage

GB/T 1695-2005

Kv/mm

≥28.0

9

Volume resistivity

GB/T 1410-2006

Ωcm

>1.0x1015

10

anti-ultraviolet aging test

(280nm-400nm,1000h,60kwh/m2)

GB/T 19394-2003

Peel strength of

film and glass

N/cm

>40

Yellowing index

<2.0

11

Tepidity test

(85℃/85%RH,1000h)

GB/T 2423.3-2006

Peel strength of

film and glass

N/cm

<2.0

Yellowing index

Laminating process

Method Condition

One-step

Two-step

Laminating machine

Laminating machine

Oven

Setting temperature

140-145℃

100-110℃

140℃

vacuumize

5 minutes

6minutes

/

The first time pressing

    70KPa       

(each 10 second)

40KPa

/

The second time pressing

   40KPa           ( each 10 second)

/

/

The third time pressing

   0KPa

/

/

Keeping pressure and curing

8-12minutes

  8 minutes

  12minutes

Remark:Laminating conditions appropriately adjusted according to differences in equipment and requirements.

Storage condition:

The product must be stored in a cool and dry place, storage period for 6 months since the date of production. Once the packaging is opened, the product should be used up within 48 hours. The unused part should be packed by original sealed packaging or similar packaging again.

The company self developed high-performance EVA solar encapsulation material on the basis of European process technology. 





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