1. Problem 1: the bag warping problem occurs in the heat sealing of the three side sealing
Bag Making Machine. The causes and solutions are as follows:
Heat sealing reason:
(1) The thickness of the composite film is not consistent;
(2) The heat sealing temperature is too high or the heat sealing time is too long;
(3) In the longitudinal heat sealing knife part, the running track of the composite film is not straight;
(4) Insufficient cooling;
(5) The ripening time is not enough;
(6) The heat resistance of the surface substrate film is poor;
(7) In the composite process, the tension matching control of composite substrate is improper, which leads to the residual stress after aging, especially when the thickness of composite film is thin.
The countermeasures are as follows
(1) Adjust the tension of floating roller;
(2) The inner sealing substrate with low temperature heat sealing property is selected;
(3) Adjust the heat sealing temperature to the appropriate temperature;
(4) Sufficient cooling;
(5) Fully mature;
(6) Re select the surface substrate film;
(7) Adjust the tension of each part of the composite processing equipment to make the shrinkage ratio of the two composite substrates equal as much as possible.
2. Trilateral
Bag making machine in the process of manufacturing three side bag sealing is the
Bag machine sealing brittle and brittle broken situation, this situation is particularly distressing, not on the bag can not be used normally, and will cause waste of resources, the following to see the reasons and Countermeasures!
reason:
(1) The heat sealing temperature is too high;
(2) The pressure is too high;
(3) The heat sealing time is too long;
(4) The edge of the upper sealer of the bag making machine is too sharp or the polytetrafluoroethylene is damaged;
(5) The silicone rubber sealing at the bottom of bag making machine is very hard;
(6) In the process of compounding and curing, a part of adhesive penetrates into the film. Because of the penetration of adhesive, the toughness (impact resistance) of the substrate decreases and the brittleness increases;
(7) After cooling and placing, the heat sealing strength of the plastic composite packaging bag increases, and at the same time, it tends to become brittle.
Countermeasures:
(1) According to the heat sealing characteristics of the inner seal material, the appropriate processing temperature, pressure and heat sealing time are selected;
(2) Improve the surface state of the heat sealing knife on the upper part of the bag making machine to make the surface of the sealer smooth;
(3) It is well covered with polytetrafluoroethylene cloth;
(4) Choose the appropriate hardness of silicone rubber pad.
August 21, 2020
