From the perspective of packaging performance, food packaging bag requirements can be divided into two parts: internal and external:
1. Intrinsic requirements: The inherent requirements of food packaging refer to the technical requirements for ensuring the quality and quantity of food in its packaging through packaging.
Strength requirements: This package can protect the packaged food from various external destructive forces such as pressure, impact and vibration during storage, stacking, transportation and handling. There are many relevant factors related to the strength requirements of food packaging. There are mainly three types of factors such as transportation methods (such as cars and airplanes), stacking forms (such as multi-layer stacking, cross-stacking), and the environment (such as climate and sanitation).
Barrier requirements: Barrier is one of the important properties in food packaging. Many foods are stored and packaged. Due to poor barrier properties, the flavor and quality of the food changes, which ultimately affects the quality of the food. The barrier requirements are determined by the characteristics of the food itself, which are characterized by external barriers, internal barriers or selective barriers. The blocking substances are air, water, grease, light, microorganisms and so on.
Respiratory requirements: Some exported foods such as fresh fruits and vegetables still maintain breathing function during packaging and storage. Therefore, such packaging materials or containers are breathable or can control the breathing effect, so as to achieve the purpose of preservation.
Nutritional requirements: Food will lose nutrition gradually during packaging and storage. Therefore, food packaging should be conducive to the preservation of food nutrition, and more ideally, nutrition can be locked through packaging. Other requirements: There are many inherent requirements for food packaging, such as heat resistance requirements, light protection requirements, shatter prevention requirements, and moisture retention requirements.
2. External requirements: The external requirements of food packaging are the use of packaging to reflect the characteristics, performance, and image of food. It is the external visualization and manifestation of food.
Safety requirements: The safety of food packaging includes aspects such as hygiene safety, handling safety and use safety. Hygiene and safety means that food packaging materials should not contain substances harmful to the human body; in terms of packaging technology, the processed foods should remain as unchanged as possible in their nutritional content, color, and taste. Handling safety means that the packaging can ensure the safety issues during transportation and loading and unloading. It should also include the safety of consumers when they pick up and carry them after shopping. Use safety is to ensure that consumers will not be harmed in the process of opening and eating.
Promotional requirements: Food packaging is one of the best means of food promotion. The performance, characteristics, eating methods, nutritional content, and cultural connotation of foods can be promoted on the packaging. The promotional nature of food packaging includes: necessary information promotion, image promotion, color promotion, structure promotion, etc.
The external requirements of food packaging bags also include: convenience requirements, prompt requirements, interesting explanation requirements, and emotional explanation requirements.