Food vacuum packaging machines are generally used in the inspection of flexible packaging. The vacuum generator principle uses a detection device. The vacuum generator uses the principle of jet flow to make the positive pressure of compressed air change to a negative pressure to form a stable air source. Pressure pulsation, high impurity content and many other disadvantages. The food vacuum packaging machine puts an appropriate amount of tap water in the vacuum chamber, puts the sealed sample vacuum packaging bag in the vacuum chamber, and it is better to cover the vacuum chamber with a sealing cap. The sample vacuum packaging bag is automatically pressed into the water with a clamp, and the power is turned on Switch, turn the vacuum degree adjustment knob to evacuate the vacuum chamber. Feel free to control time and vacuum. The adjusted vacuum value is determined according to the characteristics of the test sample, such as the packaging materials used, the sealing conditions, etc., or the relevant product standards. However, it must not be caused by the internal and external pressure difference between the sample and the ambassador sample to crack or crack at the seal.
The food vacuum packaging machine observes the leakage of the sample during the evacuation and the holding period. According to the continuous bubbles generated, a single isolated bubble is the gas attached to the outside of the packaging bag, and it is not considered as a sample leakage phenomenon. The knob for effectively closing the vacuum degree, opening the valve of the air inlet pipe, so that the vacuum chamber communicates with the atmosphere, opening the sealing cover and taking out the sample bag. If there is no continuous bubble generation and no water infiltration during the unsealing inspection of the sample during the evacuation and vacuum maintenance, the sample is qualified, otherwise it is not qualified. The food vacuum packaging machine uses other methods, which requires that the packaging bag is under the set test conditions or there is no leakage of test liquid. When the pressure in the vacuum chamber is quickly restored, it is more acceptable if the sample can return to its original shape.