General Vacuum Tumbler usual degree of vacuum is : 0.04 to 0.08 MPa actually depends on what specific packaging and vacuum packaging is given after the items into the airtight container , the container before sealing the air ! forming a vacuum draw , so that substantially no air within the sealed container as a packaging technology. Vacuum packaging method according to the different methods of exhaust gas , the exhaust gas heating , vacuum sealed in two ways. The former is obtained by filling a food packaging container be heated and evaporated in the air from the packaging container by heat expansion and cold air moisture in food , and then sealed and cooled , the packaging container is formed in the certain degree of vacuum .
        Vacuum sealed process is carried out on the vacuum packaging machine , the packaging container by the vacuum pump air out , after reaching a certain degree of vacuum immediately sealed containers so formed in a vacuum state .
       Compared with the heated exhaust method, vacuum sealed method is to reduce the contents of the heating time , and better preservation of food color , smell, taste , and therefore , the exhaust sealing method is widely used , especially for slow conduction heat exhaust products more appropriate. Vacuum Tumbler is the use of vacuum typically 600-1333 Pa vacuum packaging technology packaged food container. Therefore, the vacuum packaging is virtually impossible to completely vacuum is not necessary. Therefore , in turn called vacuum packaging , vacuum packaging or exhaust package .