On the development of the hottest barrier packagin

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The development of high barrier packaging (Part 1)

high barrier packaging materials are composed of several different types of multi-layer resins. This material can prolong the shelf life of food, and can also introduce a certain gas to realize controllable modified atmosphere packaging. It is this kind of material that can display temperature, deformation and other data in real time and draw curves that makes the food on the shelf fresh for several months, or even as long as a year

I. brief history of the development of high barrier packaging

according to the report of a consulting company in New Jersey, the development history of the high barrier industry has been more than 20 years. Many polymer product companies began to put barrier film materials for packaging on the market after the mid-1970s. At that time, the processing method of this material was to use polyolefin materials as adhesives to compound similar polymer films into multilayer films. However, if the high barrier technology is considered to include the processing technology on the metal foil substrate, it actually began more than 40 years ago. The average daily output of mill print, standard packaging and American natio crude steel in the United States has reached a record high. Companies such as nal can and print pack have used extruded polyethylene film compounded on metal foil as barrier packaging materials as early as the 1950s. Due to the thin foil material and good barrier property, it was thought that the high barrier industry had been formed at that time. It can be said that these companies are pioneers in the high barrier film industry. At present, according to the statistical data of 1998, according to its market share, the following American companies are in the forefront of the high barrier polymer film Market: Bemis, Printpack, American National can, sealed air, Reynolds and Huntsman

at the beginning of the development of high barrier packaging industry, consumer requirements are the first element of market development, but cost is also an important factor in the development of this new material. Developers believe that food should be kept fresh as far as possible to reach consumers, which is the first driving force for the development of new materials. The second driving force refers to the optimal operation, that is, to achieve the lowest cost of thin film materials. In other words, products should be sold at a reasonable and correct price. If it is only for packaging ordinary potato chips and other products, there is no need to design and manufacture a high-grade film. Developers generally believe that the pipeline of economic circulation system is behind the development, and creativity is behind the market. The high barrier light flexible packaging market is a good example. In order to replace metal cans, glass bottles or other hard packaging, polymer packaging must use high barrier materials and coextrusion technology

meat food packaging is an industrial sector that used barrier packaging in the early stage. After the development and improvement of high barrier technology in this sector, other food markets - fast food, cheese, candy and other products have also begun to follow suit, especially in the new field of formulated fast food. Due to the low fat content of this kind of food, the ability to maintain the original flavor is weakened. Therefore, in order to keep the original taste of low-fat and fat free food, we must turn to the plastic supply factory to provide high-quality barrier film materials to obtain a longer food preservation time

in the 1990s, high barrier packaging materials have undergone two changes, namely, from 1992 to 1996 to 1996 to today. In the first transformation, the basic coatings of four main high barrier materials were formed: nylon, PVDC, EVOH and sprayed metal film. However, the progress of society makes consumers demand barrier packaging, and then increase the load step by step to carry out a series of 10s experiments. They hope that the food is fresher and can maintain the original flavor and high quality of the product, which urges material developers and researchers to seek more advanced packaging materials and development solutions. From the mid-1990s to today, some composite packaging plastic films have more than 15 layers. What is particularly striking is that various high and new technologies have been continuously introduced into the development of high barrier films, which has become a major feature of the second reform of barrier packaging materials. (to be continued)

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