PVA water soluble film as a kind of novel packing materials, in Europe and the United States, Japan and other countries use the packing of the product is widely used in the water, for example, pesticides, fertilizers, paints, dyes, detergents, water treatment agent, mineral additives, detergent, concrete additives, chemical reagents used in photography and gardening nursing of chemical reagents, such as its main features are:
1. The environmental safety thoroughly (10%), degradation, degradation is the product of CO 2 and H 2 o, can thoroughly solve the problem of packaging waste treatment:
2. The use of safe and convenient, avoid direct contact with the user is packing materials, like harmful goods packing:
3. Can accurately measuring, avoid waste;
4. Good mechanical performance, and can be heat sealing and heat sealing strength is higher;
5. With anti-fake function, and can be used for quality products anti-counterfeiting best weapons, prolong the life cycle of products.
2. The use of safe and convenient, avoid direct contact with the user is packing materials, like harmful goods packing:
3. Can accurately measuring, avoid waste;
4. Good mechanical performance, and can be heat sealing and heat sealing strength is higher;
5. With anti-fake function, and can be used for quality products anti-counterfeiting best weapons, prolong the life cycle of products.
the production process of PVA water soluble film
PVA water soluble film mainly with PVA and starch as the main raw material, adding various additives, such as surface activity, plasticizer, adhesive and so on, its craft are different from the traditional plastic molding process and its technological process is: the first material for 18 ~ 20% water soluble solid content, salivate coating to mirror stainless steel belt, after dry film from steel strip on the belt, and then into the drying chamber is dry to a certain moisture content, the trimming winding to obtain the finished film.
.the main chemical composition of PVA water soluble film and its environmental characteristics
1. The chemical composition
The main raw material of water soluble packaging film is low alcoholysis degree of ethanol and starch, using polyvinyl alcohol film, water soluble and degradability, adding various additives. The added fertilizer evenly as C, H, O, and non-toxic, compatible with polyvinyl alcohol solution, additive components with a physical dissolving between pva and starch, improve its physical properties, mechanical properties, process performance and soluble performance, but no reaction, does not change its chemical properties. The main chemical composition is the C, H, O.
2. The features of environmental protection
PVA water soluble film products are green environmental protection packaging materials, in Europe and the United States, Japan and other countries are recognized by the state environmental protection department. At home and abroad mainly to biological oxygen demand (BOD) and chemical oxygen demand (COD) as the indicators of environmental protection. Japanese authorities determination of ethylene glycol reduction biological oxygen demand (BOD) is much smaller than the starch, the United States air products company put Airvol PVA biodegradation for five days of product can be measured BOD content less than 1% of the total initial BOD. After biological experiments showed that the polyvinyl alcohol is non-toxic, also can prevent the growth of microorganisms, has no effect on waste treatment and environmental health. Relevant departments of the microbial decomposition experiments also showed that polyvinyl alcohol is broken down, almost completely make COD down very low.
In terms of degradation mechanism, the polyvinyl alcohol with water and biological degradation properties, gel first dissolve in water to form liquid infiltration in the soil, increase soil mass of viscosity, permeability and water retention, especially suitable for sandy soil reconstruction. In the soil of PVA can be separated in the soil bacteria - a single cell strains of the genus (Pseudomonas) decomposition. At least two bacterial symbiotic system composed of biodegradable poly (vinyl alcohol) : a kind of bacteria is the activity of poly (vinyl alcohol) bacteria, and the other is a material used for the production of PVA active cultures of bacteria. Polyvinyl alcohol and secondary alcohol oxidation reaction of enzyme and then hydrolysis enzyme cut off by the main chain of the oxidation of PVA, further degradation, finally can reduce for CO and H 2 o.
PVA water soluble film mainly with PVA and starch as the main raw material, adding various additives, such as surface activity, plasticizer, adhesive and so on, its craft are different from the traditional plastic molding process and its technological process is: the first material for 18 ~ 20% water soluble solid content, salivate coating to mirror stainless steel belt, after dry film from steel strip on the belt, and then into the drying chamber is dry to a certain moisture content, the trimming winding to obtain the finished film.
.the main chemical composition of PVA water soluble film and its environmental characteristics
1. The chemical composition
The main raw material of water soluble packaging film is low alcoholysis degree of ethanol and starch, using polyvinyl alcohol film, water soluble and degradability, adding various additives. The added fertilizer evenly as C, H, O, and non-toxic, compatible with polyvinyl alcohol solution, additive components with a physical dissolving between pva and starch, improve its physical properties, mechanical properties, process performance and soluble performance, but no reaction, does not change its chemical properties. The main chemical composition is the C, H, O.
2. The features of environmental protection
PVA water soluble film products are green environmental protection packaging materials, in Europe and the United States, Japan and other countries are recognized by the state environmental protection department. At home and abroad mainly to biological oxygen demand (BOD) and chemical oxygen demand (COD) as the indicators of environmental protection. Japanese authorities determination of ethylene glycol reduction biological oxygen demand (BOD) is much smaller than the starch, the United States air products company put Airvol PVA biodegradation for five days of product can be measured BOD content less than 1% of the total initial BOD. After biological experiments showed that the polyvinyl alcohol is non-toxic, also can prevent the growth of microorganisms, has no effect on waste treatment and environmental health. Relevant departments of the microbial decomposition experiments also showed that polyvinyl alcohol is broken down, almost completely make COD down very low.
In terms of degradation mechanism, the polyvinyl alcohol with water and biological degradation properties, gel first dissolve in water to form liquid infiltration in the soil, increase soil mass of viscosity, permeability and water retention, especially suitable for sandy soil reconstruction. In the soil of PVA can be separated in the soil bacteria - a single cell strains of the genus (Pseudomonas) decomposition. At least two bacterial symbiotic system composed of biodegradable poly (vinyl alcohol) : a kind of bacteria is the activity of poly (vinyl alcohol) bacteria, and the other is a material used for the production of PVA active cultures of bacteria. Polyvinyl alcohol and secondary alcohol oxidation reaction of enzyme and then hydrolysis enzyme cut off by the main chain of the oxidation of PVA, further degradation, finally can reduce for CO and H 2 o.
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