During the processing, storage and transportation of food, the nutrients of foods will have different degrees of influence, and packaging measures are taken to control and adjust the damage of foods caused by these unfavorable factors. Factors that can be controlled by packaging, such as exposure to light (mainly ultraviolet light), concentration of oxygen, changes in humidity, heat transfer, diffusion of certain components in food, physical and mechanical damage to food, and insect microbes.
Proper packaging of food will bring great convenience and benefits to producers, storage operators, sales operators and consumers. In summary, food packaging can achieve the following direct effects.
(1) Protect food quality and prevent food from spoiling
By scientifically and rationally selecting packaging materials and packaging techniques, the food is separated from the surrounding environment, thereby eliminating the influence of environmental factors (oxygen, humidity, light, temperature and microorganisms) on the poultry, avoiding physical and chemical foods. The changes ensure the quality of the food in the process of circulation, and extend the shelf life and shelf life of the food.
(2) Prevent food from being contaminated by external microorganisms and dirt
The process of food and circulation from the factory to the consumer is very complicated, and there are many opportunities for pollution. The most terrible is the secondary pollution of pathogenic seedlings such as Clostridium botulinum and Botox, which will cause food poisoning to consumers. Therefore, reasonable and hygienic packaging is completely possible to eliminate the possibility of external pollution.
(3) Make food production more rational and save labor
Food packaging has become increasingly mechanized and automated. This not only saves labor, but also reduces the possibility of contamination during packaging operations and increases production efficiency. At the same time, the packaged food produced by mechanization and automated production is more uniform and standardized than manual operation, which provides favorable conditions for transport packaging structure design and also provides favorable conditions for standardization of transportation and storage.
(4) Promote and improve the rationalization and planning of food circulation and management
Fresh food "If vegetables and fresh fish, etc." can be packaged, it can extend its storage period, thus providing the possibility of long-distance transportation, expanding the sales scope of fresh food: it has produced great economic benefits and society. Benefits have promoted the planning of food operations.
(5) Increasing the value of the food The food has been scientifically and reasonably packaged and properly packaged and designed to give consumers a sense of nutrition, taste, hygiene and safety, thereby enhancing the value of the food and effectively promoting the food. Sales.
High Temperature And High Pressure Special Valves
Special valve refers to can be applied to a variety of special environment and adapt to a variety of complex conditions of the valve, is a very widely used in the national economic construction and development of a general mechanical products, in energy, chemical, medicine, agriculture, food, military and other industries are playing an extremely important role. With the in-depth promotion of industry 4.0, special valves have also entered a new stage of development, and the technology and market of special valves have also undergone new changes.
Compared with ordinary types of valves, special valves have obvious characteristics such as extremely complex internal flow, special structure, special materials and special uses. As a special valve in many valve types, it is applied to various special environments, can adapt to various complex working conditions, plays a special role and undertakes a particularly complex task. Therefore, special valves are often referred to as the "throat" of industrial pipes. More typical special valves are the main feed water regulator, pressure regulator spray valve, high pressure trap, Tesla valve, pilot Globe Valve, multistage pressure reducing valve, sleeve control valve, heart flap valve and so on. It is self-evident that the technical complexity of special valves is much higher than that of ordinary valves, which belong to high-end valve series both technically and in the market.
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