The market looks like an unremarkable packaging bag, and there are stories behind its production, and the production and packaging technology of packaging bags are one of them. Today, I will explain the requirements of food packaging bags for packaging technology.
1. Must understand the food requirements for protection
The chemical composition and physical and chemical properties of different foods are different, so different foods have different protection requirements for food packaging bags. For example, cakes are rich in oil and soft, and have a certain optimum moisture content, so at least they should meet the following requirements: oil resistance, high oxygen resistance (preventing oil penetration and oxidation of oil), and high moisture resistance ( To prevent the cake from losing moisture and becoming dry and hard). As another example, the packaging of tea should be high oxygen barrier (to prevent the effective ingredients from being oxidized), high humidity barrier (tea leaves are affected by moisture and mildew), high light barrier (the chlorophyll in tea will be changed by sunlight), high resistance aroma (The molecular aroma components of tea are very easy to emit and lose the taste of tea. In addition, tea is also very easy to absorb external odors), and a considerable part of the tea currently on the market is packaged in ordinary PE, PP and other transparent plastic bags, which greatly wastes the tea Ingredients, tea quality cannot be guaranteed. Contrary to the above foods, fruits, vegetables, etc. have a respiration option after picking, that is, the packaging is required to have different permeability to different gases. For example, after roasting coffee beans, carbon dioxide is slowly released, and cheese also produces carbon dioxide after packaging, so their packaging should be high oxygen barrier and high carbon dioxide permeability. The packaging of fruits and vegetables is often required to be mold-proof, because the small mist droplets on the inner wall of the packaging bag will produce a series of unfavorable biochemical uses for fruits and vegetables, causing the fruits and vegetables to brown and rot easily. Different varieties of fruits and vegetables and the same kind of fruits and vegetables of different maturity have different requirements for the permeability and selectivity of packaging materials. Raw meat, processed meat foods, beverages, snacks, baked goods, etc. also have very different protective requirements for packaging. For example, the coating of canned meat should be resistant to sulfur, the coating of canned fruit should be resistant to acid, the container of carbonated beverages should be able to withstand a certain pressure, and the packaging container of alcohol should be resistant to alcohol and block the aroma, etc. Therefore, the packaging should be designed scientifically according to the different nature of the food itself and the same protective requirements.
2. Choose packaging materials with suitable protection function
The traditional packaging materials are mainly glass bottles, metal cans, cartons and cartons. Modern food packaging materials mainly include plastics, paper, and composite materials (plastic / plastic, plastic / paper, plastic / aluminum, foil / paper / plastic, and other types of multilayer composite materials).
1. Composite materials Composite materials are the most widely used flexible packaging materials. At present, there are more than 30 kinds of plastics used for food packaging, and there are hundreds of multi-layer composite materials containing plastics. Composite materials generally use 2-6 layers, but special needs can reach 10 or more layers. The use of plastic, paper or tissue machines, aluminum foil and other substrates in a scientific and reasonable combination or lamination can almost meet the packaging requirements of various foods.
2. Plastics There are as many as fifteen or six plastics used in food packaging in China, such as PE, PP, PS, PET, PA, PVDC, EVA, PVA, EVOH, PVC, ionomer resin, etc. Among them, high oxygen resistance are PVA, EVOH, PVDC, PET, PA, etc., high humidity resistance are PVDC, PP, PE, etc .; radiation resistance is like PS aromatic nylon, etc .; low temperature resistance is like PE, EVA, POET, PA, etc .; oil resistance and good mechanical properties such as ionomer resin, PA, PET, etc., that is, high temperature sterilization and low temperature resistance, such as PET, PA, etc. Various plastics have different monomer molecular structures, different degrees of polymerization, different types and quantities of additives, and different properties. Even if the same plastic has different grades, the properties will be different. Therefore, appropriate plastics or combinations of plastics and other materials must be selected according to the requirements. Improper selection may cause the food quality to deteriorate or even lose its edible value.
3. Modern packaging of paper and cardboard mainly uses various processed potatoes (cardboard), composite paper, laminated paper (cardboard), etc., such as polymer material processing paper, wax processing paper, oil processing paper, cellophane, parchment, plating Aluminum paper, paper / aluminum foil laminated paper, etc. In transportation packaging, corrugated cardboard is the most used. Corrugated boxes and pallets almost replace wooden boxes. Honeycomb carton is the latest high-strength cardboard container. In addition, it should be noted that aluminized paper, aluminized plastic and paper / aluminum foil laminate materials, plastic / aluminum foil laminate materials have different internal structures, properties, costs, etc., and should be properly selected according to different protection requirements and cost requirements .
3. Using advanced packaging technology
In order to extend the shelf life of food, new packaging technologies such as active packaging, mildew-proof packaging, moisture-proof packaging, anti-fog packaging, anti-static packaging, selective air-permeable packaging, non-slip packaging, buffer packaging, etc. are widely used in developed countries. New technologies are not widely used in China, and some methods are still blank. The application of these advanced technologies can significantly improve the protection function of packaging.
4. Selection of packaging machinery and equipment supporting the food processing technology
In order to meet the needs of food processing technology, a variety of new packaging equipment has been developed, such as vacuum packaging machine, vacuum inflation packaging machine, heat shrink packaging machine, blister packaging machine, body packaging machine, sheet thermoforming equipment, liquid Filling machine, forming / filling / sealing packaging machine, aseptic packaging equipment, etc. According to the selected packaging materials and packaging technology methods, the selection or design of packaging machinery supporting the food processing technology and production capacity is the guarantee of successful packaging.
Fifth, packaging decoration design and packaging brand awareness
The packaging and decoration design should conform to the hobbies and habits of consumers and consumers in exporting countries. Graphic design is best coordinated with the contents. The trademark should be in an obvious position, and the text description should meet the food requirements. The product description should be true. The trademark should be catchy, easy to understand, easy to circulate, and can play a widely publicizing role. The packaging design of brand-name products should be brand-conscious, and some product packaging is easily replaced, which affects sales. For example, China ’s old Liutiao vinegar has a good reputation in Japan and Southeast Asia, but the sales volume after replacement packaging is greatly reduced because of consumer The packaging is in doubt. Therefore, a product should be scientifically packaged and cannot be easily replaced.
Packaging bags have become a part of our lives, so I will explain the requirements of food packaging bags for packaging technology for you, I hope everyone can have a clear understanding.
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