Sterility of materials and products with the most

Asepsis of aseptic packaging materials and products

asepsis packaging materials generally include metal cans, glass bottles, plastic containers, composite cans, paper-based composites, multilayer composite flexible packaging, etc

metal cans

aseptic packaging is one of the earliest packaging materials, mainly divided into tin cans and aluminum cans. At present, the most advanced typical representative of aseptic packaging of metal cans in the world, which is a market-oriented means, is Dole aseptic packaging system in the United States. The sterilization method of metal cans used by Dore system is dry heat sterilization, that is, high-temperature superheated steam is used to sterilize. When the empty cans pass through the sterilization room on the conveying chain, the superheated steam car sprays up and down for 45 seconds. At this time, the tank temperature rises to ℃, and the tank cover is also sterilized with superheated steam of ℃, which is enough to kill all heat-resistant bacteria. The characteristics of the filling system are: all containers and equipment are sterilized by superheated steam, with a high degree of sterility; There is little residual air in the top gap of the can, which is almost in a high vacuum state, and the quality of the product is safe and reliable

glass bottle

with the development of manufacturing technology, light-weight reinforced glass bottles have appeared in recent years. The development of this technology has greatly improved the heat shock resistance of glass bottles and greatly promoted the application of sterile packaging technology. We can sterilize the glass bottle with saturated steam, and then fill and cover it. During sterilization, the temperature is 154 ℃, and the time is 1.5 seconds

plastic container

plastic is the fastest growing and most widely used material in sterile packaging. It has the characteristics of low cost, diversified shape and strong mechanical adaptability. In recent years, with the co extrusion of plastic film and the continuous development of container forming technology, plastic will become the protagonist of sterile packaging materials. The requirements for plastic packaging materials are mainly the protection and preservation of food, the mechanical strength to adapt to circulation, the adaptability of packaging machines and merchantability, especially the high barrier to oxygen and water vapor. Therefore, the sterile plastic materials used by countries all over the world are mainly composite films

composite cans

are generally three piece cans made of more than two materials, namely metal cans for bottom and cover, and aluminum foil, cardboard or polypropylene for body. The composite tank has the advantages of good printing and decoration effect, low cost, light weight, convenient connection with PP, ABS and other materials without causing public hazards, but the air tightness of the composite tank is worse than that of the metal electromechanical tank, and the heat resistance is also poor

due to the poor heat resistance of the composite tank, hot air of about 127 ℃ is generally used for sterilization. The fruit juice is sterilized at a temperature above 93 ℃ and then cooled to 80 ℃ for hot canning. Sterile air is used in the filling and sealing areas to maintain positive pressure to prevent bacterial pollution. The compound tank is only limited to filling high acid fruit juice under the conditions of low temperature and high acid

paper-based composite materials

paper-based composite containers are composed of paper, polyethylene, aluminum foil and other materials. These containers are widely used in aseptic packaging in Western European countries, especially the aseptic brick boxes and diamond bags produced by Tetra Pak packaging company in Sweden. This composite material with a thickness of about 0.35mm is composed of 8 layers of materials, which has excellent resistance to oxygen and water vapor, and has good printing and decoration effect. It is easy to drink and has a long shelf life. It is an ideal material for aseptic packaging of beverages

the sterilization of paper containers adopts the method of combining hydrogen peroxide with heating. First, the packaging materials are subjected to hydrogen peroxide water bath, and then when filling, tubular heating elements are used at the feed pipe to make the air temperature as high as 430 ℃, so that the hydrogen peroxide liquid film on the surface of the paper can be quickly decomposed into water and new ecological oxygen. This oxygen has strong sterilization ability, so that the container can meet the requirements of aseptic inspection of the surrounding environment, power supply voltage, startup detection and host grounding inspection

take the Comex box produced by pkl in Germany as an example. It is a composite flexible packaging material with 6-layer structure. The outermost layer is polyethylene, followed by white paperboard, polyethylene, aluminum foil, bonding layer, and the innermost layer is also polyethylene. White paperboard is used instead of kraft paper as the base lining, which greatly enhances the rigidity of the carton

new aseptic packaging material

nano antibacterial packaging material is a new aseptic packaging material that has just emerged in recent years. It uses nanotechnology to transform pure natural basic materials, so that it can play an amazing sterilization effect. Antibacterial and aseptic packaging can denature or precipitate the bacteria. Once it meets water, it will play a stronger lethality to the bacteria, with strong adsorption capacity and strong penetration. After repeated washing, it also has a strong antibacterial effect. Sterilization of food materials is divided into thermal sterilization and cold sterilization. So far, the sterilization of food aseptic packaging materials is mainly thermal sterilization, which is divided into ultra-high temperature sterilization and high temperature short-term sterilization

cold sterilization methods of materials mainly refer to ultraviolet and microwave sterilization. Ultra high temperature sterilization refers to a process for processing dairy products or other foods under the conditions of temperature and time of ℃ and seconds respectively. It has many advantages. It can kill microorganisms in products while maintaining food quality and nutritional value. It has been widely used in the production of milk, fruit juice and fruit juice drinks, soymilk, tea, wine, mineral water and other products

for ultra-high temperature sterilization, materials with cooking taste can be sterilized at high temperature for a short time --- sterilization treatment under the condition of temperature of ℃ and time of S. this method can better maintain the nutrition and flavor of products. Its typical application is the sterilization of milk products and some vegetable products

the cold sterilization method of materials refers to various fungicides or ultraviolet sterilization, radiation sterilization, microwave irradiation sterilization, etc. according to different occasions to achieve the purpose of sterilization