The quantity of canned food must meet the specifications of the products. After processing, the raw materials should be canned quickly. The following points should be achieved:

 

1. The top clearance must be maintained. The space between the surface of the food and the lid of the pot is called the top gap of the tin. The size of the top gap is directly proportional to the height of the top gap, so it can be expressed in height (mm) in the canned industry.

 

Most food containers need to maintain a top clearance when they are canned, usually about 6 ~ 8mm. The size of the top clearance affects the vacuum in the tank, the capacity of the food in the tank and the exhaust effect. The top gap is too small, that is, the content is overloaded. In the heating and sterilization, the pressure increases in the tank because of the heat expansion of the contents, which can cause the deformation of the container easily and even produce the burst joint. The top gap is too large, that is, the content is too small. If the exhaust is not sufficient, the residual air in the tank is more, which will promote the corrosion of the inner wall of the tank and the oxidation of the product or the deterioration of the product. To this end, the volume of the tank must be properly controlled according to the solid weight of the tank, the loss of the operation process (the spillover of the delivery, pre sealing and sealing process, etc.), the state of the food and the maximum loading amount (key factors for sterilization conditions).

 

But some products (such as lunch meat, etc.), basically do not leave the top gap, this is to prevent the tank in the air and cause the product surface grease oxidation yellowing. Hot loading jam and other thick food are sealed immediately after the tank is heated (above 80 degrees centigrade). This kind of product does not need a top clearance. When the canned is sealed, germicidal, and cooled, the product can also reach a certain degree of vacuum due to the cold food in the tank. In the production of electric tin cans used in China at present, it is also used to reduce the top clearance and reduce the residual air in the tank, so as to reduce the corrosion of the food on the inner wall of the tank.

In addition, some starch containing products are easy to expand due to heat and the top gap of the tank can be kept larger.

 

2, the tank must be packed according to the product's weighing or capacity requirements. Weighing or capacity is too large, easy to cause "physical fat pot"; inadequate weighing, it does not meet the specifications. Some cans should also pay attention to the control of solid and soup according to different weighing requirements, so as to ensure solid content. In order to ensure the accuracy of weighing and better control the stability of loading quantity, -R diagram can be used. In addition, it is necessary to proofread the scale regularly.

 

3, the quality should be basically consistent. Because of the different raw materials of food, especially the raw material of fruit and vegetable, the difference of shape, size, color and maturity is caused by the different growth conditions, environment, season and so on. All kinds of meat and poultry and fish are different in quality because of different parts. Therefore, the quality collocation must be paid attention to the content of canned can when loading the pot. Color, maturity, shape, size and number are basically consistent to ensure the good appearance of the product. Reasonable collocation can also improve the utilization rate of raw materials and reduce costs.

 

4. And a fashion jar. After handling qualified semi-finished products and fashion cans, they can not accumulate too much, otherwise it will pollute microbes easily, and cause the development and reproduction of microbes, thus making the semi finished products corrupt and deteriorating, affecting the quality of products and germicidal effect. For hot pot products, if sauce or fruit juice products should not be overloaded for too long, so as not to affect the vacuum of cans.

 

5, strictly prevent inclusion of inclusions into the tank. When you install cans, you must pay great attention to cleanliness and hygiene, keep contents and cans clean. In order to prevent all inclusions from mixing into the tank, do not place other articles irrelevant to the tank.