Customers who have used the bag making machine may encounter such a situation, that is, the problem of heat sealing of the bag making machine, and the most common is the warpage of the bag after heat sealing. What are the causes of such problems and how can we effectively overcome similar problems?

The warpage of bag after heat sealing of bag making machine is inconsistent with the thickness of composite film; It may also be caused by too high heat sealing temperature setting or too long heat sealing time. In addition, in the longitudinal heat sealing knife part of the bag making machine, the uneven running track of the composite film will have the same consequences.

Of course, insufficient cooling; Insufficient ripening time; The surface substrate film has poor heat resistance; Improper tension matching control of composite substrate in the composite process leads to residual stress after curing and setting, especially when the thickness of composite film is thin, it is easier to cause such failure of bag making machine.

In order to effectively overcome the warpage of the heat sealed bag of the bag making machine, on the one hand, the tension of the floating roll should be adjusted; The inner sealing base material with low temperature heat sealing property is selected; On the other hand, it is necessary to adjust the heat sealing temperature to an appropriate temperature; At the same time, it should be fully cooled in the bag making process; Fully mature.

In addition, it is advisable to re select the surface substrate film for the bag making machine; And the tension of each part of the composite processing equipment can be properly adjusted to make the retraction rate of the two composite substrates equal as far as possible, so that the probability of heat sealing instead of bag warpage of the bag making machine will be greatly reduced.