Water soluble film production technology development present situation at home and abroad
At present, the manufacture of PVA membrane process method, mainly include the solution salivate method ( Wet) , and extrusion blown film method ( Dry) 。 These two kinds of process are 'thoroughly' traditional plastic film production. Because PVA water-soluble substances, the membrane process condition is different from the thermoplastic plastic, so the above two kinds of process directly applied in the production of PVA membrane, there are many technical problems, and then have some economic problems, such as the quality is not easy to control, low efficiency, high energy consumption, covers an area of large, high equipment investment. Therefore, the research to improve the technology and equipment, the two make it more applicable PVA film production, is central to the development of the industry at home and abroad.
Water soluble PVA film is rising in the world in recent years a new type of plastic product, belongs to the plastic film manufacturing.
As a main raw material for the pva and starch of new green packaging materials, it has water and biological degradation characteristics, can be decomposed into CO2 and H2O, is worthy of high and new environmental protection product.
In both Europe and the United States, Japan and other countries recognized by the state environmental protection department.
Water soluble PVA membrane has excellent transparency and gloss, not charged, the larger the tensile strength and tear strength, good oil resistance, excellent gas barrier property, thermal property and bonding, moisture permeability, as well as good demoulding and metal plating, and under certain conditions with water soluble and biodegradability, and as a kind of new packaging materials, has extremely broad in flexible packaging and unique purpose.
Solution basic production process include: water soluble PVA to stretch film coating, drying, Heat treatment) To shed, coiling and finished products. process is relatively simple, but not easy to control product quality, the low membrane rate, high energy consumption and equipment investment is large.
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