Polyvinyl Alcohol PVOH Water Soluble
LIWEI CHEMICAL CO. LTD
PVOH water-soluble films are a type of film material primarily made from polyvinyl alcohol (PVA), which is characterized by its good water solubility. These films are nontoxic, colorless, and odorless. They can dissolve quickly in water to form a homogeneous aqueous solution without leaving residues or generating harmful substances, thus meeting the requirements of environmental protection and green packaging. These films are mainly used for specific unit dose packaging of detergents, agrochemicals, water treatment chemicals, food ingredients, pharmaceuticals, and dyes.
Pesticide and fertilizer packaging: PVOH water-soluble films can be used as packaging materials for
pesticides and fertilizers. These films can protect the product's stability during transport and storage,
and they can also be quickly dissolved in water after use to reduce environmental pollution, in line with
the requirements of green environmental protection.
Packaging for toiletries: These are widely used in the packaging of products in the toiletries industry,
such as washing powder, detergent, shampoo, etc. They can be directly dissolved in water without the need
for additional packaging removal, providing consumers with a convenient use experience and making
housework easier, cleaner, and safer.
Food Packaging and Processing: PVOH water-soluble films are also used in the food industry for packaging
such as candy, chocolate, and powdered foods. Their excellent barrier properties protect the quality and
taste of food products, while the solubility of the films provides an environmentally friendly
solution.
Pharmaceutical & Medical: In the pharmaceutical sector, PVOH water-soluble films are used as drug
coatings, slow-release films, and packaging for medical supplies. By controlling the dissolution rate of
the film, a timed release of the drug can be achieved, improving the efficacy of the drug.
Industrial applications: PVOH water-soluble films also play an important role in the industrial field,
such as being used as additives for coatings, inks, glues, etc., to improve their performance and
stability.
The production of PVOH water-soluble film is mainly based on polyvinyl alcohol (PVOH) as the main raw
material, with the addition of other auxiliary materials such as reinforcing agents, plasticizers,
emulsifiers, and film release agents. The production steps are as follows:
Preparation of raw materials: First, prepare the required polyvinyl alcohol (PVOH) and other auxiliary
materials such as reinforcing agent, plasticizer, emulsifier, and film release agent. The specific
proportion of the formula can be adjusted according to the properties of the desired film, such as the
concentration of polyvinyl alcohol, the content of soluble starch, glycerol, Tween 80, and silicone oil.
Dissolving and mixing: Mix the polyvinyl alcohol and other auxiliary materials in a certain proportion,
and add an appropriate amount of solvent to make them fully dissolved and mixed. In this process,
attention needs to be paid to controlling the temperature, stirring speed, and other parameters to ensure
the homogeneous mixing of raw materials.
Coating and casting: The mixed solution is evenly coated on the steel plate or other suitable substrate
for casting operation. The thickness and speed of casting can be adjusted according to the desired film
thickness and properties.
Drying and Curing: After cast coating, the film is dried and cured. This step usually needs to be carried
out at a certain temperature, e.g., 80 to 90°C, for a certain period, e.g., 20 minutes, to ensure that the
film is completely dry and cured.
Unwinding and Rolling: After the film has dried and cured, it can be removed from the substrate and
subjected to a rolling operation. The rolled film can then be cut, packaged, and processed as required.
Packaging: Sealed packaging using moisture, dust and UV resistant packaging materials
Storage: It
should be stored in a dry, cool and well-ventilated place, avoiding direct sunlight and high temperature.
Yes, PVOH water-soluble film is a type of plastic. It is a new, environmentally friendly packaging material
made from high polymers with water-soluble properties. This film is non-toxic,non-polluting, and can be
completely biodegraded into water and carbon dioxide (CO2) in nature.
PVOH water-soluble film is unique in that it dissolves quickly when exposed to water, making it ideal for
packaging applications that require easy disposal or where environmental impact is a concern. However, while
it is biodegradable, proper disposal and handling are still crucial to maximizing its environmental
benefits.
