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PVA water soluble film
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HOME>PRODUCTS>PVA water soluble film

Product Speciality/ Specification/ Application

Product Speciality

Environmental Friendly characteristic
The water-soluble film is green environmental Product. It is verified by microorganism tests that PVA is non-toxic and doesn't restrain from the growth of microorganism and can be degraded totally.
It has no any bad effect on environment. Once PVA is dissolved in water, specific microorganism will cause it to degrade. When treated with activated sludge, solutions of PVA will be decomposed into water and carbon dioxide.

Water solubility

1.Solubility is related to PVA film's thickness and temperature. According the time of dissolving, the film has three types, quick, middle, difficult, all depend on its thickness and water temperature. Thicker film makes slow dissolving, high temperature makes fast dissolving. Related data is shown as below:
the time of dissolving of water-soluble film(thickness 35cm, water temperature 20??/span>)

Type

the beginning of dissolving (sec.)

total dissolving (sec.)

quick

<10 sec.

<2 minutes

middle

<5 minutes

<40 minutes

difficult

don't dissolving when temperature is under 40??/span>

total dissolving when temperature is over 80??/span>

2.Appearance has brightness and embossment

3.The color has achromaticity and red, blue, yellow, green.

Safety

Water soluble pva film can prevent operators from contacting toxic materials directly.It is safer and more convenient.

Transparence and lustrousness

Water-soluble PVA films gain the advantage of higher transparence and lustrousness over other films .

Item

PVA film

Cellophane

PVC film

PET film

Transparence %

90.1

60.5

50.4

57.8

Reflectivity %

81.5

60.5

79.5

22

Water content

Water content of the water-soluble PVA film can change with environmental humidity. The water-soluble PVA films are usually sealed with the PE film to keep its water content invariable. After the water-soluble PVA films is taken out of the PE film, water content can vary from environmental humidity, whose property also varies with it.

Under normal temperature, its water content and environmental humidity will vary as table:

Relative humidity??RH??

40%

60%

80%

90%

Water content??%??

4-5

7-9

10-12

13-15

Good gas barrier properties

Water-soluble PVA film has an excellent gas barrier to oxygen, nitrogen, hydrogen, helium, argon, carbonic acid gas and so on when the humidity is low, but it permit moisture and NH 3 to penetrate . Moreover, it has an excellent fragrance preservation of the contents and can keep products moisture and fresh as well.

Permeability of various plastic mensurated with Salame

Plastic Parmachor values

Permeability(cc - 20u/m2 - 24h - atm)  Real values

N2               O2               CO2               O2

PVA

160

0.02

0.06

0.21

.02

PVDC

97

0.6

3.6

12

2

PET

68

21

80

310

40

PVC

61

100

200

1000

300

HDPE

39

800

2000

12000

2500

PP

31

1600

5400

20000

3000

PS

27

2400

8000

26000

/

LDPE

26

3200

10000

36000

10000

Good antistatic properties

Because water-soluble film has a lot of hydroxyl groups in molecule, it does not take charges. It is different from the film that is made from the other synthetic resins and it has the same antistatic properties as cellophane. If PVA film is used for product packing, it could keep products out of dust.

The static parameters of various films:

Items

PVA film

Cellophane

PVC film

PE film

PET film

Static pressure ??V??

1??2

1.3

40.5

98.6

120.6

Good printability

Water-soluble PVA film has the h3 polarity and the excellent printability so as to gravure print is beautifully completed without spark-treatment. Presently it has been widely used in the field of special printing, for example, water transfer printing.

Strength and Weathering resistance

PVA film has good tenacity, biaxial tension-strength and anti-tearing strength that ranks high among all kinds of films, flexing resistance is 10 times to other films. It has excellent Weathering resistance and service life is very long.

Strength of various films

Varieties

PVA film

Cellophane

PE film

PP film

PVC film

Tension strength (Mpa )

44.12-63.74

54.92-131.40

17.26-19.12

45.11-53.9

20.59-17.65

Anti-tearing strength ( Mpa )

147.10-833.57

1.96-3.92

29.53-98.07

12.75-68.6

39.23-78.45

Elongation percentage ( % )

150-400

15-25

50-600

200-600

5-25

Good heat sealability and adhesiveness

Water-soluble PVA film has an excellent gas barrier to oxygen, nitrogen, hydrogen, helium, argon, carbonic acid gas and so on when the humidity is low, but it permit moisture and NH 3 to penetrate . Moreover, it has an excellent fragrance preservation of the contents and can keep products moisture and fresh as well.

Resistance to oil and chemicals

The Water-soluble PVA film has the good characteristic to resist the oils and fats such as animal oils, vegetable oils, mineral oils, fats, organic solvents and the hydrocarbons to penetrate. However, it can be affected by h3 acid, h3 base, chlorine free radical and some special chemical which can react with PVA such as borax, boracic acid and coloring matter and so on, so it isn't fit for packing the above things.

Absorbability of oils and fats

Spe

Test conditions

PVA

PET

OPP

PE

OPS

Gasoline

20 / ten days

0

1.1

1.1

4.7

 

Diesel oil

40 / thirty days

0

3.2

5.2

3.5

2.8

Salad oil

40 / thirty days

0

1.8

3.1

4.6

1.5

Absorbability of solvents (PPM)

Spe

Methylbenzene

Isopropyl alcohol

Acetic ester

Amount

PVA

3

80

1.1

1.1

EVAL

120

3440

3.2

5.2

CPP

3740

600

1.8

3.1

OPP

6120

430

3700

13040

PET

670

1070

1520

4820

Anti-falsification

It's the best weapon to protect the top quality products, prolong the using time of the products.

 
 
 
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