[China Packaging Network News] The market seems to be a humble package, behind its production has its own story, and packaging bag production and packaging technology is one of them, today for you to interpret the food packaging bag for packaging Technical requirements.
First, we must understand the food requirements for protection
Different foods have different chemical compositions, physical and chemical properties, and so on, so different foods have different protective requirements for food packaging bags. For example, cakes are more oily, fluffy and have a certain optimum moisture content, so at the very least they should comply with the following requirements: high oil-barrier properties (prevent oil and grease oxidation), high moisture resistance ( Prevent the cake from losing moisture and dry and harden. For another example, the packaging of tea should be high oxygen barrier (to prevent the active ingredient from being oxidized), high moisture resistance (damaged and degraded tea leaves), high light-blocking (change in chlorophyll in tea caused by sunlight), high-resistance aroma Sex (tea molecular aroma components can be easily distributed, and lose tea flavor. In addition, tea is also very easy to absorb external odor), and a considerable part of the current market is a common PE, PP and other transparent plastic bag packaging, which greatly wasted tea effective Ingredient, the quality of tea cannot be guaranteed. Contrary to the above-mentioned foods, there are respiration choices after fruit and vegetables are picked, which means that the packaging requires different transmission rates for different gases. For example, after the packaging of roasted coffee beans, carbon dioxide is slowly released, and cheese also generates carbon dioxide after packaging. Therefore, 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 droplets on the inner wall of the bag will produce a series of unfavorable biochemical use of fruits and vegetables, resulting in browning and perishable fruits and vegetables. Different varieties of fruits and vegetables and different maturity of the same species of fruits and vegetables on the packaging material breathability and selectivity requirements are also different. Raw meat, meat processed foods, beverages, small foods, baked goods and other protective requirements for packaging are also very different. For example, canned meat paint should be sulfur-resistant, canned fruit paint should be acid-resistant, aerated beverage containers should be able to withstand a certain pressure, alcohol packaging containers should be resistant to alcohol and barrier aroma and so on. Therefore, scientific packaging should be designed based on the different nature of the food itself and the protective requirements of water.
Second, choose the protection function suitable packaging materials
The traditional packaging materials are glass bottles, metal cans, cartons and cartons. Modern food packaging materials mainly include plastics, papers, composites (plastic/plastic, plastic/paper, plastic/aluminum, foil/paper/plastic, and other types of multi-layer composite materials).
1. Composite materials Composite materials are the most widely used type of flexible packaging material. At present, there are more than 30 plastics used in food packaging, and there are hundreds of multi-layered composite materials containing plastics. Composite materials generally use 2-6 layers, but special needs can reach 10 layers or more. The use of plastics, paper or tissue machines, aluminum foils and other substrates, scientific and rational compounding or laminating, can meet the requirements of various foods for packaging.
2. Plastics There are as many as fifteen or six kinds of plastics used in food packaging in China, such as PE, PP, PS, PET, PA, PVDC, EVA, PVA, EVOH, PVC, ionomer resin, and so on. Among them, there are PVA, EVOH, PVDC, PET, and PA that are highly resistant to oxygen, PVDC, PP, and PE that are highly resistant to moisture, such as PS aromatic nylon that are resistant to radiation, and PE, EVA, and POET that are resistant to low temperatures. PA, etc.; good oil resistance and mechanical properties such as ionomer resin, PA, PET, etc., that is, high temperature sterilization and low temperature resistance, such as PET, PA and so on. The molecular structure of various plastics is different, the degree of polymerization is different, the type and amount of additives are different, and the performance is also different, even if the properties of the same plastic with different brands will be different. Therefore, it is necessary to select suitable plastics or combinations of plastics and other materials according to requirements. Improper selection may result in deterioration of food quality or loss of food value.
3, paper and cardboard modern packaging mainly uses a variety of processing potato (cardboard), composite paper, laminated paper (cardboard), such as polymer materials processing paper, wax processing paper, oil processing paper, cellophane, parchment, plating Aluminum paper, paper / aluminum foil laminated paper and so on. In transport packaging, corrugated board is the most used, corrugated cartons, almost all of the trays instead of wooden boxes. Honeycomb cartons are the latest high-strength cardboard containers. In addition, it should be noted that the internal structure, properties and cost of aluminized paper, aluminized plastics and paper/aluminum foil laminates, and plastic/aluminum foil laminates should be appropriately selected according to different protection requirements and cost requirements. .
Third, the use of advanced packaging technology methods
In order to extend the shelf life of foods, new and continuously developed packaging technologies, such as active packaging, anti-mold packaging, moisture-proof packaging, anti-fog packaging, anti-static packaging, selective air-permeable packaging, anti-skid 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 protective function of packaging.
Fourth, choose and food processing technology supporting packaging machinery and equipment
To meet the needs of food processing technology, a variety of new packaging equipment has been developed, such as vacuum packaging machines, vacuum inflatable packaging machines, heat shrink packaging machines, blister packaging machines, body packaging machines, sheet thermoforming equipment, liquids Filling machine, forming/filling/sealing packaging machine, aseptic packaging complete equipment, etc. According to the selected packaging materials and packaging process methods, selecting or designing packaging machinery supporting food processing technology and production capacity is the guarantee for successful packaging.
Fifth, brand awareness of packaging and decoration design and packaging design
Packaging and decoration design should meet the preferences and habits of consumers and consumers in exporting countries. The pattern design is best coordinated with the contents. The trademark should be in a clear position and the text description should meet the requirements of the food. The description of the product should be true. Trademarks should be catchy, easy to understand, easy to circulate, and can play a wide publicity role. The packaging design of brand-name goods should have a brand awareness, some product packaging can be easily replaced, affecting sales, such as China's old six vinegar has a good reputation in Japan and Southeast Asia, but the sales volume after replacement packaging is greatly reduced, because consumers are new to Wrapped with suspicion. Therefore, a product should be scientifically packaged and cannot be easily changed.
Packaging bags have become a part of our lives, so Xiao Bian explains to you the requirements of packaging technology for food packaging bags. I hope everyone can have a clear understanding.