Composite vacuum packaging bag is what material?
Composite vacuum packaging bag is two or more materials, after one or more composite process and combined together, so as to constitute a certain function of the composite material. Generally can be divided into the base layer, functional layer and heat seal layer. The base layer mainly plays a beautiful, printing, moisture barrier and other roles. Such as BOPP, BOPET, BOPA, MT, KOP, KPET, etc.; functional layer mainly plays the role of barrier, light avoidance, such as VMPET, AL, EVOH, PVDC, etc.; heat sealing layer and packaging items in direct contact, play a adaptability, resistance to permeability, good heat sealing, and transparency, opening and other functions, such as LDPE, LLDPE, MLLDPE CPP, VMCPP, EVA, EAA, E-MAA, EMA, EBA, etc. On the basis of the development of the packaging industry, the packaging of items has also been developed accordingly. From simple paper packaging, to single-layer plastic film packaging, developed to the extensive use of composite materials. Composite film can make the packaging contents with moisture, fragrance, beauty, freshness, light avoidance, anti-permeation, extended shelf life and other characteristics, and thus has been developed rapidly.
As society progresses and human needs grow, a variety of functional and environmentally friendly packaging films continue to emerge. For example, water-soluble polyvinyl alcohol film, which is environmentally safe, thoroughly degraded and has good heat sealing performance, is being developed as an inner layer film application in addition to single-layer packaging materials.
Multi-layer composite packaging materials have become a hot spot for development in recent years, the emergence of a number of new products and new technologies, the original composite film is developing to a deeper level, bag-making, printing technology on a new level, has entered the “color revolution” era. With the development of the market economy, the packaging of daily necessities, cosmetic packaging, food packaging, packaging of electrical appliances have put forward higher requirements, on the other hand, with the growing environmental protection, in order to meet the performance of the packaging office before the batch, to minimize the amount of waste generated. So that the packaging film, packaging containers to lightweight, thin-walled direction. Dry lamination-based high barrier film, in the production process with adhesives, solvent emissions are easy to pollute the environment, and the development of co-extruded packaging film, its process equipment investment, low cost, adaptable, easy to operate.
International multilayer composite film development is fast, the relevant information shows that developed countries co-extruded packaging film accounted for 40% of the entire flexible plastic packaging materials, while China only accounted for 6%, still mainly dry composite film, the proportion of the two is not reasonable. At present, China’s co-extrusion technology also has a new improvement. The development of co-extruded packaging film will change the product structure of multi-functional film, which is suitable for precision electronic components, hardware anti-oxidation and puncture resistance, and other types of high-barrier, fragrance and airtight packaging.