Generally, the following principles apply to the selection of food packaging bag materials. 1. Correspondence principle Since food has high, medium and low grades according to the scope and location of use, it is the corresponding principle of food packaging materials to choose foods with different grades of materials or designs. 2. Applicable principles Due to the different varieties and characteristics of foods, they require different protective functions. Packaging materials must be selected to suit the different characteristics of different foods and different circulation conditions. For example, the packaging material of puffed food requires high airtightness, while the packaging of poultry eggs needs shock absorption and vibration to adapt to transportation. For example, high-temperature sterilized food should be made of high-temperature resistant materials, while low-temperature refrigerated food should be made of high-temperature resistant packaging materials. That is to say, when choosing packaging materials, food characteristics, climatic (environmental) conditions, transfer methods and links (including circulation) must be considered comprehensively. During the packaging operation, the possibility of ingredients such as additives in the packaging material migrating into the food and certain ingredients in the food permeating and adsorbing into the packaging material should be known. The properties of food require moisture, pressure, light, odor, mold, etc. Climatic environment conditions include temperature, humidity, temperature difference, humidity difference, air pressure, gas composition in the air, etc.; cycle factors include transportation distance, transportation mode (people, cars, ships, airplanes, etc.) and road conditions. In addition, it is necessary to consider the different packaging requirements of different countries, different ethnic groups and regions, so as to adapt to the market and customer acceptance. 3. Economic principles Packaging materials should also consider their own economics. After considering the characteristics, quality and grade of the food to be packaged, design, production and advertising factors will be comprehensively considered to achieve the lowest cost. The cost of packaging materials is not only related to its market procurement cost, but also related to processing costs and distribution costs. Therefore, when choosing a packaging design, various factors should be considered to choose the most suitable material. 4. The principle of coordination Packaging materials play different roles and meanings in different positions of the same food packaging. According to its location, the packaging of the product can be divided into inner packaging, middle packaging and outer packaging. The outer packaging mainly expresses the image of the product to be sold and the overall packaging on the shelf. The inner packaging is the packaging that is in direct contact with the food, and the packaging between the inner packaging and the outer packaging is the intermediate packaging. Different packages of the same food serve different functions, so different packaging categories should also be related to materials. The inner packaging uses flexible packaging materials, such as plastic soft materials, paper, aluminum foil and composite packaging materials; the intermediate packaging uses cushioning materials with cushioning properties; the outer packaging is selected according to the characteristics of the food, and more corrugated cardboard or cardboard boxes and cartons are used. In addition, plastic sheets such as wood and bamboo are also used more. How to match and coordinate food packaging materials with the role of packaging, combined with the characteristics of food, requires a comprehensive analysis to achieve functional requirements and economic costs. 5. Aesthetic principles When choosing packaging materials, you should consider whether the food packaging designed with this material can make the product sell well. This is an aesthetic principle, actually a combination of art and packaging appearance. The color, texture, transparency, rigidity, smoothness and surface decoration of packaging materials are all the artistic content of packaging materials. The packaging materials that express the power of art are paper, plastic, glass, metal, ceramics, and the most difficult to achieve artistic packaging, such as natural wood, bamboo and rattan. 6. Scientific principles How to choose packaging materials scientifically needs to extract materials according to factors such as market, function and consumption. The principle of selection should be based on processing requirements and processing equipment conditions, starting from science and practice; according to consumer psychology and market demand characteristics; according to environmental protection requirements; according to price and satisfaction function; according to new technologies and market dynamics; according to operators and materials A reasonable choice, such as the user’s special requirements. 7. The principle of combining with packaging technology methods For a given food, after selecting the appropriate packaging materials and containers, the most appropriate packaging technology should be used. The choice of packaging technology is closely related to packaging materials, and also closely related to the market positioning of packaged food. The same food can usually use different packaging technologies to achieve similar packaging functions and effects, but the packaging costs will be different. For example, the packaging of oxidizable food can be vacuum-packed, air-filled or encapsulated in a deoxidizer, but the cost of the latter may be relatively high. Therefore, sometimes in order to achieve packaging requirements and design effects, it is necessary to combine packaging materials and packaging technology. In addition, when actually selecting food packaging materials, design and selection can be made with reference to existing or used food materials with the same characteristics or similar foods. After comparing the advantages and disadvantages of similar food raw materials on the market, it is necessary to choose; use the test method to determine the type and specification of the packaging material; use a variety of packaging materials to test the selection of packaging; it can be selected after the parameter test of the packaging material, which requires User parameters of packaging materials such as oxygen permeability, water permeability, pressure resistance, tensile strength, tear resistance, folding resistance, heat resistance, peelability, mildew resistance, etc. These parameters are fully understood, It is also necessary to carry out the storage and transportation process on parameters such as the drop, pressure, vibration and impact strength of the package, and the test of the slewing bearing. Then, users are required to understand packaging regulations and standards to ensure the smooth operation of packaging materials, operations and circulation. The above is the whole content of “how to choose the material of “packaging bag” custom food packaging bag”.
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