PVA film manufacturing
PVA is the only vinyl polymer that can be used as a carbon source and energy source by bacteria. It can be degraded by 75% in 46 days under the action of bacteria and enzymes. It is a biodegradable polymer material that can be mass produced by non-oil routes. The price is low, its oil resistance, solvent resistance and gas barrier performance are outstanding, and it has unique advantages in food and pharmaceutical packaging. The application of PVA is based on the solution method, and the film material is prepared by casting film formation. However, the solution processing needs to undergo the dissolution and drying process, and has the disadvantages of complicated process, high cost, low yield, etc., and it is difficult to prepare thick-walled and complex-shaped products. At the same time, it is not possible to co-extrude blow molding with other materials to prepare a multilayer composite film.
(1) copolymerization modification, introducing a weakly acting unit on the main chain or the side group by copolymerization or polymer reaction, weakening the intramolecular and intermolecular forces of the PVA, and lowering the melting point;
PVA film manufacturing process
(2) Blending modification, by adding a large amount of polymer capable of generating hydrogen bonds with hydroxyl groups in PVA, destroying the inter-pulp interaction of PVA, lowering the melting point or increasing the thermal decomposition temperature, such as sugar derivatives, collagen hydrolyzates, and the like. Nishino blends the sugar derivative Poly (GEMA) with PVA, and its thermal decomposition temperature is greatly increased. When the amount is added to 25 wt%, the thermal decomposition temperature of the mixture reaches 326 °C. Novamont of Italy's Montedison Group developed and produced the most successful PVA/starch composite “MaterBi” grade, an interpenetrating network structure polymer plastic alloy composed of modified starch and modified PVA, which has excellent molding processability and secondary Processability, mechanical properties and biodegradability. The company has developed extrusion molding sheets, blown films, cast films, injection molded products, hollow containers, toys and other products.
(3) Post-reaction modification, by chemically modifying the hydroxyl groups on the PVA molecular chain, introducing structural units which can reduce the regularity of PVA and improve thermal stability, and improve the thermoplastic processing performance of PVA. Nishimura research shows that the alkyl boronic acid complex can effectively reduce the melting temperature of PVA and increase the decomposition temperature to achieve melt spinning.
(4) Plasticization modification, the method is simple and efficient, and there are many researches on plasticization at home and abroad. Single or composite plasticization modification such as water, inorganic salt, glycerin, polyol and its oligomer, caprolactam and alcohol amine is used. A reducing agent that lowers the melting point of PVA and improves processing fluidity.
Patented full biodegradable film and PVA bag, all products are made by casting equipment, It is different from traditional blow molding products, all blow molding products are non full biodegradable. We can produce pva films and bags in all transparent and various colors.
For more PVA film and bags products please visit us:
http://www.joyful-printing.net/pva-bag/
http://www.joyful-printing.com/pva-bag/
The factory is located in the chuangxin industrial Park of Leiyang City, Hunan Province. 2 hours high-speed railway journey from Shenzhen. With cheap manpower and development costs, so we could offer good products with cheap price to our guests.
There are several advanced PVA water-soluble film production lines, various packaging bags and shopping bag production lines in our factory. We have developed PVA films of various temperatures. Among them, PVA high-temperature film technology is the world's leading film technology, and there is a strong R&D team and management team in our factory. We are a new materials technology company specializing in the research, production and sale of water-soluble films (PVA-polyvinyl alcohol film).
PVA water-soluble film has excellent barrier properties, water solubility and environmental friendliness. It is one of the most successful green materials in recent years. It has been widely recognized by environmental authorities and users at home and abroad, and is increasingly used in packaging, textile embroidery and water transfer printing.
For example: pesticides, fertilizers, dyes, detergents, water treatment agents, mineral additives, detergents, chemical reagents for garden care, etc., can also be used as rapeseed, plant seed bags, clothing bags, food and hospital washing bags, industrial The packaging of various products such as supplies and electronic products can also be used for textile embroidery padding materials, water transfer printing, and film stripping. At the same time, the company successfully developed packaging bags and supermarket shopping bags for various application scenarios this year. Customized bags and shopping bags of various specifications.
The factorey specializes in product quality, technology improvement and product innovation, and is committed to providing customers with products and services that are satisfactory.