Introduction
Definition of PVA water soluble film
PVA water soluble films are made from polymer material PVA, also called polyvinyl alcohol Water soluble film. Besides its main component -polyvinyl alcohol (PVA),some additives will be also added to achieve some functional features. It offers excellent biodegradability, high transparency, and excellent chemical and physical properties. It is widely used in pharmaceutical packaging, pesticides packaging, seed packaging, detergent packaging, building cement additives packaging, and other fields.
Mothds of production
The production method of PVA water-soluble film is relatively simple. Firstly , mixing PVA particles with water, in the process of heating and stirring, PVA particles gradually dissolve in water, and form a certain concentration of PVA solution. Secondly, the PVA solution is poured into the mold for molding, and the PVA water soluble film can be obtained by drying.
Feature of PVA water soluble films
PVA water soluble film is a new polymer environmental protection material with excellent performance and wide application. They have been gradually and widely used in many fields with the improvement of people’s environmental awareness and the further improvement of environmental protection laws and regulations. Then what are the feature of water soluble films?
Firstly, the main feature of PVA water soluble film is its water solubility. PVA water soluble film can break down into small fragments first when meets water at the suitable temperature and then fully water soluble as time. The whole dissovling process is eco-friendly and leave no any harmful residue.
Secondly, PVA water soluble films are also biodegradable, the possible residue can be decomposted into harmless matter by the microorganisms in the surrounding environment.
Thirdly, PVA water-soluble films also have excellent transparency and corrosion resistance besides the biodegradability.
Fourthly, PVA water soluble film also has a certain processability, can be made into different uses of PVA water soluble film products through heat sealing, printing and other processing methods.
In short, PVA (polyvinyl alcohol) water soluble film is a new type of green packaging material. It is known for its excellent water solubility and biodegradability, and is benefit for environment.
Therefore, they have been widely used in some fields that are more sensitive to environmental pollution, such as pharmaceutical packaging, chemical packaing , detergent packaging, and so on.
In this article, we will introduce the application of PVA water-soluble film in agriculture, chemical industry, medicine, and other industries.
Characteristics of water soluble film
1. It is water soluble
The soluble temperature and water dissolution speed can be customized, non-toxic and pollution-free.
2. It is an anti-static
The water soluble film is different from other plastic films and has good anti-static property. In the process of using water-soluble film packaging products, it will not reduce its plasticity and electrostatic dust performance because of static electricity.
3. Good Moisture and gas transmittance
Water-soluble films have strong permeability to water and ammonia, but have good barrier properties to oxygen, nitrogen, hydrogen and carbon dioxide. These characteristics make it possible to maintain the composition and original smell of the packaged product in good condition.
4. Good heat sealing
The water soluble film has good heat sealing, suitable for resistance heat sealing and high-frequency heat sealing, heat sealing strength and temperature, humidity, pressure, time and other conditions, generally greater than 200g/cm2.
5. Good Mechanical properties
Mechanical properties of water-soluble packaging film: strong modulus 2500 ~ 400kg/cm2, tearing force 200 ~ 50kg/cm2, elongation 150 ~ 220%.
6. Oil resistance and chemical resistance
The water-soluble packaging film has good oil resistance (vegetable oil, animal oil, mineral oil), fat, resistance to organic solvents and carbohydrates, but PVA can react chemically with strong alkali, strong acid, chlorine free radicals , such as borax, boric acid, some dyes, etc., Such substances are recommended not to use water-soluble film packaging.
Application of PVA Water soluble films in Agriculture
Seed Packaging Bags
The application of biodegradable PVA water-soluble film for seed packaging bags is a promising and environmentally friendly technique to improve the quality and guarantee the safe transportation of seeds. PVA water-soluble bags can also protect seeds from pests and diseases, which is essential for the successful germination of seeds. After planting, PVA water-soluble bags can dissolve in the soil and promote the growth of seedlings.
Pesticide Packaging
PVA water-soluble films can be used in the packaging of pesticides, which helps to reduce environmental pollution. Water-soluble bags filled with pesticide can be directly thrown into water or directly onto the soil, reducing the risk of pesticide contact during and after use.
Chemical Packaging
PVA water-soluble films can be used to package chemicals such as dyes, pigments, and detergents. The water-soluble film is safe, non-toxic, and has good compatibility with a variety of chemicals. When used, the package can be dissolved in water without any pollution to the environment.
Application of PVA Water soluble films in Medicine
Infection Prevention
PVA water-soluble film has broad prospects in the medical field because it can prevent the spread of infection. The PVA water-soluble film can be used to package and transport medical supplies such as masks, protective clothing, and sterilized supplies. After use, the PVA water-soluble film can be dissolved in water to prevent the spread of infection.
Water Soluble Laundry Bags
PVA water-soluble film can also be used to make water-soluble laundry bags, which can be used for washing contaminated surgical instruments and hospital linens safely. These laundry bags can contain medical waste such as clothes contaminated with medical fluids and can be dissolved in water during washing without contaminating the washing machine or environment.
Application of PVA water soluble films in Other Industries
Marble Release Film or Quartz stone Release Film
PVA water-soluble film can be used in the production of artificial marble or quartz stone . During the production process, PVA water-soluble film can be used as a release agent to facilitate the separation of the finished products from the molds.
Fishing bait Packaging
PVA water-soluble film is non-toxic, but it don’t suggest to use it to pack the food directly.
However, it is one of the best choice for finshing bait packaging . The water-soluble fishing bait packaging bags can dissolve quickly in water, and the main components are converted into water and carbon dioxide, leaving no residue and being environmentally friendly.
It is also easy to carry and easy to cast, and the nesting point is clearly marked, so you can fill the nest at any time.
Electronic Product Packaging
PVA water-soluble film is also suitable for electronic product packaging. The water-soluble film can protect electronic products from dust and moisture. After use, the water-soluble film can be dissolved in water, avoiding the need for environmentally unfriendly disposal methods.
Cement additive Packaging
Using Water soluble bags as cement additives packaging, can avoid dust flying harm to the environment. In particular, it is necessary to add glass fiber and basalt fiber (which can improve its tensile limit strength, which can be increased by 30-50%), so the use of water-soluble bag packaging is the most convenient and most reasonable way. Moreover, a small amount of PVA in concrete also has the effect of increasing bond strength.
Conclusion
In conclusion, PVA water soluble films are the romising and environmentally friendly material with a wide range of applications in various industries. The application of PVA water-soluble film can reduce environmental pollution and promote sustainable development. The development and application of PVA water-soluble film will greatly benefit society and the environment.
