The so-called canned food refers sealed containers and packaging, after appropriate heat sterilization (achieve commercial sterility), at room temperature for long-term preservation of food. Canned food is traditional food, packaging form and species diversity, food and easy to carry, on the mobility of staff travel, field work and other dietary supplements is very convenient and important. But if you choose properly the health hazard. The following beverages covered by professional production, iron and aluminum EOE businesses - Dongguan Real Connaught Packing Co., a brief introduction to some common metamorphic canned facilitate everyone to identify, in order to better select canned food.
(A) corrosion
Canned rust corrosion can be divided into external and internal corrosion. But whether it is inside or outside the rust rust, once the tank wall perforation, its contents are subject to bacterial contamination, the tank will be excessive heavy metal content of food, and therefore can not be purchased.
(B) the fat hear that drum to listen. When the pressure inside the can is greater than the air pressure, the bottom of the can of the two projecting expansion, a phenomenon known as fat listen. Fat listen listen fat can be divided into biological, chemical fat listen, listen physical fat.
Biological sterilization of canned fat hearing is due to the production process is not complete or re-enter the bacterial decomposition of canned food, produce carbonic acid gas, causing the fat to listen. This is called the corrupt fat fat listen listen, also called fat really listen.
Chemical fat acidity hearing is due to a large pot of food, while the inner layer coated with tin tin uneven or tin layer damage, food acids and long-term effects of iron, causing a chemical reaction and emit hydrogen together in the tank, the pressure is too big fat formation listen.
Physical listen fat is mainly due to excessive contents, inadequate exhaust, canned or improper operation due to cold. Physical generally called fake fat fat listen listen tank food is not bad, is edible.
(C) tank food color, turbidity, and precipitation.
Such phenomenon is mainly present in the glass canned food, which for many reasons, such as canned glass in the process of being run out of direct sunlight and discoloration; some due to inventory when the temperature is too high, thus making food in the juice turbidity, color change dark. Either because transport drastic shock loading, contents and so broken by the earthquake. Where there is such a phenomenon can, can not buy edible.
(D) perishable rancidity
After this kind of canned food spoilage, do not listen to produce fat phenomenon, normal appearance. Mainly anaerobic decomposition of Botox and other contents due. Such canned after opening can smell rancid, sour, absolutely inedible.
