Food is rich in nutrients, necessary for human consumption, but also a good medium for the growth of microorganisms. Under normal natural conditions, the storage resistance is very poor, and it will soon be spoiled. The purpose of food processing and preservation is to provide people with food that has both certain nutritional value and original flavor, so as to enrich the material life of human beings. . In order to properly and well preserve food, it is necessary to choose the packaging container first. Packaging containers should generally meet the following conditions:
(1) Hygienic and non-toxic food is the main source of energy for human life activities. As a container for food preservation, due to direct contact with food Therefore, the most important factor is that it is not poisonous to the human body and ensures that the food meets the hygienic regulations (laws). Canned food for export should generally comply with the relevant health regulations and rules of the US Food and Drug Administration (FDA) and the importing country, and products sold in the country should comply with the national health standards.
(2) Foods with good airtightness are generally spoiled due to the activity and reproduction of microorganisms. As canned containers, they must have Reliable sealing performance, so that after the food is sterilized by heat, it is no longer subject to secondary pollution by microorganisms from the outside (air and water), which will cause the food to deteriorate during storage.
(3) Good corrosion resistance Various canned foods contain certain nutrients, organic acids and salts, some compounds (such as protein Quality) will decompose during high-temperature sterilization and aggravate the corrosion of the container; some compounds will slowly corrode the tank wall during storage (such as organic acids in tomato products and canned fruits). In order to ensure long-term storage of food, The selected container must have good corrosion resistance.
(4) Convenience to eat As a container for storing food, it should be convenient for consumers to eat and carry, and have a certain strength, so as to Adapt to the needs of transportation and sales.
(5) Containers suitable for industrialized production as canned food must be able to withstand various mechanical processing during the production process, and must be suitable for industrial production.The requirements of factory mechanization and automatic production, while high efficiency, stable quality, low cost and can meet the needs of modern production management.
