The impact of the environment on barrier films and their applications

The barrier properties of plastic films are greatly influenced by environmental factors. The barrier properties of plastic films are usually influenced to a greater or lesser extent by the ambient temperature. Generally speaking. The higher the temperature of the same film, the greater the permeability to gases and water vapour; the barrier properties of barrier materials with greater polarity J, such as nylon PVA, are also significantly influenced by humidity, and their barrier properties are significantly reduced in humid environments. When the barrier properties of films are listed, the test conditions are usually stated in addition to the data measured under standard conditions (by standard conditions, I mean a flexible packaging material with a thickness of 2.54 μm, tested at 23°C and 65% RH). In practice, the oxygen and moisture permeability of a film of a certain practical thickness is often given for ease of use, but not the permeability of the material at a thickness of 25.4 μm.



Barrier films are the most important and widely used of the functional films. Along with the promotion and application of barrier films, in order to give full play to the advantages of barrier packaging materials, many characteristic packaging technologies have been developed, such as vacuum packaging, oxygen-absorbing packaging, nitrogen-filled packaging, aseptic packaging, gas-conditioning packaging, cooking packaging, etc. The successful application of barrier films and specific packaging technologies has played a significant role in extending the shelf life of goods or reducing the loss of goods and widening the sales market. The successful application of barrier films and specific packaging technologies has played a significant role in extending the shelf life of goods or reducing the loss of goods and widening the sales market, etc. In production practice, it has shown more and more obvious economic and social benefits, and more and more applications. susumino.comNanjing Sumino Seiko specialises in film production lines



Applications

I.   Applications of barrier films in meat packaging



1. Packaging of frozen cuts of meat

Frozen cuts of meat are usually shaped, packed into bags, boxed and frozen at low temperatures for long-term storage or exported overseas. Low temperature storage inhibits the life of microorganisms and slows down the physical and chemical effects of air on the meat, so that the quality of the meat can be maintained for a longer period of time and the shelf life can be more than 4 months.

The shelf life of meat can be more than 4 months. The use of sealable composite packaging materials such as PET/PE/AL helps to improve the isolation of the space inside the bag and the atmosphere, thus extending the shelf life of the food.



2. Packaging for cooling cuts of meat

Cooling meat in the 0 ~ 4 ℃ temperature storage conditions, can better maintain the nutritional composition of meat and flavour, but due to the higher temperature conditions, easier to spoil, even under refrigeration conditions, the storage period is only about three days. The use of inflatable packaging (mainly nitrogen and carbon dioxide) can maintain the meat's oxygenated myoglobin serious think bright red, to maintain the freshness of the meat, but also can effectively inhibit the growth of bacteria, so that the cargo period is extended to about 14 days. PA/EVOH/PE can be thermoformed, good stiffness, high barrier, suitable for air conditioning packaging.



3. Vacuum (paste body) shrink packaging for fresh meat preservation

Vacuum shrink packaging has good moisture resistance and oxygen barrier, compared to non-shrink products, it can improve the appearance of the packaged products, strengthen the protection of the products, reduce blood seepage and extend the shelf life of goods, the shelf life of vacuum packaging pork is about 30 days, beef is about 80 days, PA/EVOH/PE high barrier, suitable for vacuum packaging.



4. Western-style low-temperature meat products packaging

Western-style low-temperature products are often sliced in aseptic chambers and then vacuum-packed to isolate the food inside the bag from the outside world, slowing down the rate of oxidation of fat in the meat and extending the storage period of the product.



5. Traditional Chinese meat products and other packaging

In order to extend the shelf life of traditional Chinese meat products, often using the steaming bag packaging, sterilisation and other methods. Nowadays, steaming at 121°C for a few minutes is used, followed by immediate reduction to 90°C and then reheating for tens of minutes, basically overcoming disadvantages such as flavour deterioration. www.susumino.com南京住野精工专业制造薄膜生产线




6. Ham sausage packaging

Ham sausages, which have a shelf life of up to six months at room temperature, have always been of interest to meat processors and small-town consumers. At present, the total production of ham sausages in China is around 2 million tons, accounting for about half of the cooked meat products. The composite film with PVDC as the barrier layer is currently the dominant material for ham sausage packaging.



II.   Processed vegetable packaging applications



Processed vegetables, especially the pickled vegetables, represented by squash processed vegetables, the promotion of the application of barrier film vacuum small package, greatly extended the shelf life of vegetables, not only greatly expanded the sales radius of commodities, to promote the sale of goods, and the use of small packages significantly increased the sales price of goods, increasing the profit margin of the product, while the vacuum small package to facilitate the use and improve the processing of vegetables The use of efficiency, so that consumers no longer bear the burden of processed vegetables rotting, from which also got a clear benefit, presenting a win-win situation for producers and consumers, trusted by consumers. www.susumino.com南京住野精工专业制造薄膜生产线




III.   Packaging of foodstuffs

Refined rice, high-grade mixed cereals and other commodities, the use of barrier film packaging practice shows that the use of barrier film packaging can effectively prevent spoilage and significantly improve shelf life.



In other areas, such as convenience foods, casual foods and microblogging foods, barrier packaging films are also used in large quantities, and barrier packaging films have become an indispensable material in food packaging.





Nanjing Sumino Precision Machinery Co., Ltd. has professional cast film production lines, the company's main cast film manufacturing lines are: TPU hot melt film production line, CPP/CPE cast film production line, EVA solar encapsulation film production line, PE hygiene breathable film production line, PVDF cast film production line, PP three-dimensional film production line, medical blood purification film production line, multi-layer co-extrusion barrier film production line, LLDPE winding film production line, etc.