Product Speciality
¡ñEnvironmental 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.
¡ñWater 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¡æ)
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¡æ |
total dissolving when temperature is over 80¡æ |
2.Appearance has brightness and embossment
3.The color has achromaticity and red, blue, yellow, green.
¡ñSafety
Water soluble pva film can prevent operators from contacting toxic materials directly.It is safer and more convenient.
¡ñTransparence 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 |
¡ñWater 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 |
¡ñGood 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 |
¡ñGood 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 |
|
Cellophane |
PVC film |
PE film |
PET film |
Static pressure £¨V£© |
1£®2 |
1.3 |
40.5 |
98.6 |
120.6 |
¡ñGood 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.
¡ñStrength 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 |
¡ñGood 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.
¡ñResistance 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 |
¡ñAnti-falsification
It's the best weapon to protect the top quality products, prolong the using time of the products.
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