Food packaging materials

Hygiene and safety means that food packaging materials should not contain substances harmful to the human body; in terms of packaging technology, the nutritional content, color and taste of the processed food should be kept as unchanged as possible.　　Strength requirements: the packaging can protect the packaged food against various destructive forces, such as pressure, impact and vibration, during storage, stacking, transportation, and handling.From the perspective of packaging performance, the requirements for food packaging bags can be divided into two parts: internal and external: 　　1. Handling safety means that the packaging can ensure the safety during transportation and loading and unloading, and it should also include the safety of the consumer when shopping and carrying it after purchase..　　 

Breathing requirements: Some exported foods, such as fresh fruits and vegetables, still maintain breathing function during packaging and storage. .　　 Barrier property requirements: Barrier property is one of the important properties in food packaging. The performance, characteristics, eating method, nutritional content, and cultural connotation of food can be promoted on the packaging.　　Safety requirements: The safety of food packaging includes aspects such as hygiene and safety, safe handling and safe use.　　Nutrition requirements: Food will gradually lose nutrition during packaging and storage.　　 Promotional requirements: Food packaging is one of the best means of food promotion. Therefore, such packaging materials or containers are breathable, or can control breathing, so as to achieve the purpose of preservation. 

External requirements: The external requirements of food packaging are the use of packaging to reflect the characteristics, performance, and image of the food, which is the external visualization and expression of food and methods. The promotion of food packaging includes: necessary information promotion, image promotion, color promotion, structure promotion, etc. Therefore, food packaging should be conducive to the preservation of food nutrition, and more ideally, nutrition can be locked through packaging. The barrier substances are air, water, grease, light, microorganisms and so on. 

 There are many factors related to the strength of food packaging, mainly including transportation methods (such as automobiles, airplanes), stacking forms (such as multi-layer stacking, cross stacking) and environment (such as climate, sanitary environment) and other three types of factors. Due to poor barrier properties, the flavor and quality of the food will change, which will ultimately affect the quality of the food. Many foods are stored and packaged.　　 2. The barrier requirements are determined by the characteristics of the food itself, and its characteristics include external barriers, internal barriers or selective barriers, and so on. Safety in use is to ensure that consumers will not be harmed during the opening and eating process.

Internal requirements: The internal requirements of food packaging refer to the technical requirements for food packaging to achieve color binding sheet quality and quantity in its packaging. Other requirements: There are many inherent requirements for food packaging, such as heat resistance requirements, light resistance requirements, shatter resistance requirements, and moisture retention requirements.　　 The external requirements of food packaging bags also include: convenience requirements, prompt requirements, interesting description requirements and emotional description requirements, etc