Explanation of the multiple feeding device of BIB/Air dunnage bag inner bag making machine

The production process of the BIB/Air dunnage bag inner bag making machine: two PP/PE films are placed on the loading rack respectively, corrected by the automatic correction system, then punched, valves installed and sealed, and then cut into finished bags by cutting knives after longitudinal and transverse sealing. Because the length of the longitudinal sealing knife is fixed, the length of the longitudinal sealing knife of ordinary machines is 850mm, and a single heat seal can only seal no more than 850mm. If the length of a single bag is 2400mm, then it is impossible to completely seal the bag in one heat seal, and at this time, a multiple feeding device is needed.

The so-called multiple feeding device means that the machine achieves complete heat sealing of longer bags through multiple heat sealing during operation.For example, the length of the bag is 2400mm, the length of the heat sealing knife is 850mm, the feeding device advances 800mm each time. In order to be able to make the bag all sealed, the feeding device advances 800mm each time, every time it advances, the heat sealing knife seals the bag once, through A, B, C three times the longitudinal sealing, so that the whole bag is all heat-sealed after the transverse sealing.

(PS: The picture shows only one side of the longitudinal sealing.)

Different lengths can use different times of multiple feeding. The above example uses three times of multiple feeding. If the length of the bag is 1600mm, then two times of multiple feeding are required. Different lengths of heat sealing knives use different multiple feeding systems, so specific adjustments need to be made according to actual conditions.