High Barrier Packaging-Multilayer Co-injection Injection System
High Barrier Packaging-Echos Multi-layer Co-injection Injection System
the technical development of multi-layer high barrier packaging has effectively solved the technical problems of plastic high barrier packaging. AKS S-TECH CI series injection molding system, which can realize multi-layer co-injection filling in the mold cavity and directly obtain three-layer co-injection preforms or related products.
Barrier Packaging:
"Food is the most important thing for the people, and safety is the first thing to do", as the market has higher and higher requirements for food quality and safety, the demand for multi-layer high-barrier food packaging equipment is becoming more and more urgent, and the common plastic bottles on the market are not like what the people think. As well as the sealing, in recent years, with the rapid development of the food industry, the market has a wide variety of food types, fresh beer, prefabricated dishes, quick delivery ingredients, beverages, dairy products, baked cakes, marinated products, aquatic products and condiments, etc. In order to improve the quality of food color, aroma, taste, etc., as well as the needs of anti-corrosion and processing technology, and to ensure the safety of food during storage, transportation, sales and use, most foods need to add preservatives, nutritional fortifiers, Antioxidants, etc., and packaging products, such as plastic bottles, glass bottles, metal and other packaging materials. Usually food preservatives can inhibit microbial activities and prevent food deterioration, so as to prolong the shelf life and shelf life of food. The packaging of food through coated bottles, glass bottles, metal and other packaging materials helps to block the oxidation and deterioration of food, and avoid contamination of food by external pollutants. At the same time, it is convenient for storage, transportation and sales, and enhances the appearance and aesthetics of products. Even so, some ceramic bottles, glass bottles, metal and other packaging materials have problems such as high cost, high energy consumption, difficult recovery and relatively poor oxidation blocking. In recent years, with the continuous upgrading of the consumer market and the continuous improvement of food safety requirements, the barrier packaging of green food flexible packaging and high barrier multi-layer flexible packaging (multi-layer film bags), as well as high barrier multi-layer hard packaging came into being (multi-layer hardware containers). Some foreign countries have long used multi-layer high-barrier packaging containers for the packaging of milk, wine, beer, edible oil, soy sauce and other products. They have the characteristics of high barrier property and temperature resistance, and can extend the product without adding preservatives. The shelf life improves the quality of food packaging, thereby promoting the high-quality development of the food packaging industry.
Through multi-layer co-injection process, three layers of injection molded preforms or products are obtained. The middle layer adopts special physical high barrier materials and even adds some oxygen inhibitors to obtain high barrier packaging containers suitable for different scenes. In the cases we tested, for example, in the actual production cases of 350ml, 1000ml, 3000ml, 4000ml, 20000ml and 30000ml of fine brewed fresh beer, high-efficiency formula is used to test 4000ml multi-layer co-group preforms, after blowing into beer barrels, after testing, the blocking rate of OTR is as high as 0.000062 cm3/pkg * 24h, which makes the common single-layer PET bottle more than 600 times, close to the blocking effect of glass bottles. The plastic high barrier packaging scheme of food has made a revolutionary technological breakthrough.
This technology can also be widely used in fresh juice packaging bottles and other fields. Especially HPP NFC, that is, the high-end fresh juice on the market, that is, low-temperature ultra-high-pressure sterilization non-concentrated reduced fresh juice. The fruit juice has not been sterilized at high temperature, and there is no instant pasteurization. The cold pressed and cold sterilized fresh fruit juice without additives has almost no loss of taste and nutritional content such as vitamins. It is the development trend of healthy fruit juice drinks in the future. This technology provides the best storage for the fresh-keeping and storage of the fruit juice of this process. It is light in weight, good in portability, long in shelf life, low in logistics storage and transportation costs, and the bottles can be recycled, economic and environmental protection.
this process, during injection molding, the three-layer material is injected at the same time to fill the mold cavity, and the three-layer product is obtained at one time, and the three-layer is filled in a remelted state, so there is no need to use adhesive materials, and because of the use of high-pressure injection molding in the film The process can obtain high-precision product profile accuracy, so that the sealing of the bottle mouth and the bottle cap becomes simple and reliable. At the same time, the injection-pull blowing process can obtain a high-pressure bottle body, in the laboratory test of Ekos, the maximum burst pressure is 9.2bar, which is almost impossible to achieve in the multi-layer process.
is currently a multi-layer high barrier packaging technology for containers, which is mainly dividedMultilayer Co-extrusion Technology and Multilayer Co-injection Technology, however, for a long time, the multi-layer co-extrusion hollow plastic molding equipment involved in the production of multi-layer high-barrier packaging containers in our country, especially the key technologies, have been basically monopolized by large manufacturers in developed countries abroad. Moreover, the multi-layer co-extrusion hollow plastic molding equipment is expensive and costly, and many domestic enterprises engaged in multi-layer blocking food packaging are deterred. Therefore, it is of great significance to speed up the innovation and breakthrough of multi-layer high barrier food packaging technology and break the monopoly of foreign developed countries' enterprises on industry technology. In the field of multi-layer co-injection technology, the global market is basically monopolized by HUSKY in Canada and MIRKRON in the United States. Compared with multi-layer co-extrusion technology, this technology has the same barrier characteristics. More advantages, such as more precise bottle mouth size accuracy, convenient and precise sealing, and higher pressure resistance, the pressure resistance can be as high as 7-9kg/cm², it can be applied to beer, aerated beverages, etc., and the storage is safer. At the same time, due to the use of high-temperature multi-layer fusion co-injection process, there is no need to add adhesives between the multiple layers, and the repeated application of materials and environmental protection treatment are simpler and safer. In addition, because this technology is completely an in-film molding technology, there is no problem of waste of residual material removal of co-extrusion technology, which saves materials and wastes less; finally, the middle layer of this technology can be made thinner, reducing the consumption of expensive barrier materials, and the cost is more competitive, but the difficulty of this technology is significantly higher than that of multi-layer co-extrusion bottle blowing technology. At present, although domestic companies have a few patent applications, there is no mature technology for commercial mass production that can be used. This technology is designed to touch multi-layer hot runner technology, co-injection process control technology, special multi-layer co-injection special injection molding machine, etc. The technology chain involved is relatively long, and it needs to involve many core technologies such as fluids, materials, hot runners, special injection molding machines, process control, etc. Domestic enterprises have few related technology reserves and high technical risks, the research and development cycle is long, and it is difficult for enterprises in different fields to cooperate in research and development, which is extremely difficult to overcome in the short term. Nearly a hundred related patents are in the hands of business teams in the United States, Canada, and Italy, and it is extremely difficult for domestic companies to apply.
At present, in the beverage packaging industry, multi-layer barrier plastic bottles are a hot topic. It can improve the preservation of contents and enhance the added value of products. However, as a high molecular polymer material, low molecular gases such as oxygen and carbon dioxide cannot block moisture. These problems have always been a serious strategy faced by plastic packaging containers and products, so the packaging industry continues to explore and develop new processing technologies and materials to achieve multi-layer barrier packaging. The appearance of high barrier plastic bottles has a history of more than ten years, and it was first mainly used in PET beer bottles. By plating a layer of high barrier material (such as silica) on the P E T single-layer bottle, the excellent barrier performance of the material is used to prevent the infiltration of oxygen and the loss of carbon dioxide. Oxygen absorbing agent, light blocking agent, etc. can also be added in the middle of the bottle to improve the oxygen blocking and light blocking properties of the bottle. The latest situation is that multi-layer co-injection high-barrier bottles are rapidly replacing coated aluminum cans and iron cans, reflecting more superior cost advantages and environmental protection advantages. Colleagues are convenient for continuous industrial production and have more free and changeable appearance. At present, the mainstream applications in the world are mainly concentrated in beer, aerated beverages, protein beverages, fresh fruit juice beverages without preservatives, and flavored bottle containers.
for more information, please contact the engineers of Ekos Injection Molding Technology Co., Ltd.
