Sterile Paper-Based Packaging Overview Sterile packaging is a high-tech food preservation method. It means that the packaged food is sterilized for a short period of time before packaging, and then the packaging, packaged goods, and packaging aids are aseptic Next, a packaging technology for filling and sealing in a sterile environment to achieve food without added preservatives, without refrigeration, to obtain a longer shelf life (at room temperature can be maintained for one year to one and a half years is not The purpose of deterioration is to greatly save energy and equipment.
At present, aseptic packaging foods (especially sterile small packages) occupy more and more market share in the market. Aseptic packaging is becoming more and more popular with consumers, mainly determined by its characteristics. Aseptic packaging can use the most suitable sterilization methods (such as HTST method, UHT method, etc.) to sterilize the contents of the package. Food quality such as color, flavor, texture, and nutrient content is less affected. Since the packaging container and the food are sterilized separately, regardless of the size of the container, a stable product can be obtained, and even a large packaged food can be produced. Furthermore, compared with sterilization after packaging, it is less likely that the food material and the container are reduced in the solubilization of the packaging material component into the food, which is advantageous for realizing the authenticity of the food. Since the container surface sterilization technology is relatively easy and has nothing to do with the sterilization of the contents, the heat resistance of the packaging material is not required to be high, and the strength requirements are not so strict, so that sterilization can be more easily realized, and it is suitable for automated continuous production, which is both manual and energy-saving .
Normal temperature beverage boxes are usually brick-shaped, as most of these beverage boxes are produced by Tetra Pak, so people are accustomed to calling them "Troll packs." The main material of the Tetra Pak is paperboard, which is made from long, raw fibers. Some of these fibers are bleached and have not been bleached. In order to increase the thickness and stiffness, some chemical thermal refining (CTMP) is usually added to the board. In order to make the surface of the cardboard smooth and easy to print, there is a thin coating on the outside of the cardboard. Tetra Pak is composed of six layers of paperboard, polyethylene plastic and aluminum foil, of which 73% are paper, 25% are plastic, 5% are aluminum, and 2% are printing inks and coatings. All of the cardboards are from sustainable renewable forest resources in Europe and the United States. Its main suppliers are international paper companies, Stora Enso, and Wellswick.
Sterile Paper-based Composite Packaging Structures and Advantages Sterile paper-based packaging materials are aluminum foil/paper/plastic composite materials. There are mainly Tetrapark products in Sweden, PKL companies in Germany and SIG Combibloc products. . Among them, cardboard is a structural material, and the ratio and performance of its pulp are proprietary technologies, and it is matched with its unique packaging machine. Aluminum foil is a barrier material with a typical thickness of 6μ and must be free from porosity and damage. Polyethylene is an inner layer material that is in contact with food and is a heat seal material. Sarin resin prevents aluminum foil from etching in highly acidic beverages.
1. Aseptic brick. The aseptic brick is made of composite laminates of paper, aluminum and plastic and is about 0.35mm thick. The typical structure is: Tetra Pak: PE/Cardboard/Adhesive Layer/AL/PE/PE; SIG Combibloc: PE/ White paperboard / AL / adhesive layer / PE. The inner layer functions as a heat seal and contains food. The aluminum foil provides the best oxygen barrier, water blocking, and light protection. The adhesive layer connects the aluminum foil and the cardboard. The cardboard provides rigidity and printability. PE protection ink and cardboard.
2. Aseptic pillow. Sterile pillows are also multi-layer paper, aluminum, plastic composites, close to bricks, but different in cardboard material. Its structure is: PE/paper/adhesive layer/AL/adhesive layer/PE. Paper is a printing layer that can be flexo-printed or offset-printed, with good barrier properties and light protection.
3. The advantages of aseptic packaging.
(1) The main advantage of aseptic packaging is that it can retain the original nutrients and flavors in the food as much as possible under the aseptic condition and reduce losses.
(2) The packaging cost of aseptic packaging is relatively low, and storage and transportation are convenient (the weight of the packaging only accounts for 5% to 10% of the weight of the food).
(3) Appearance is beautiful and easy to be welcomed by businesses and consumers.
(4) Increase consumer's sense of enjoyment, increase beauty, and stimulate consumers' desire to purchase.
(5) The price is reasonable, so that consumers spend most of their money on food rather than packaging.
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