The packaging machinery has been used for a long time, especially in the case of continuous work and overload, it is prone to some electrical failures and mechanical failures, such as insufficient sealing, fuse blowing at the start, temperature uncontrollable, deformation of the finished bag at the sealing and bending, sealing Bubbles or irregular marks appear on the embossed portion of the knife. The relevant reasons for the packaging machinery to seal the seal are not strong: 1 The bag can not be sealed at the seal; A, the heat sealing temperature is not enough Under normal circumstances, the composite bag with OPP as the lining, when the total thickness of the bag is 80-90μm, the heat sealing temperature should reach 170-180 °C; the total thickness of the composite bag with PE as the lining is 85-100μm. When the temperature is controlled, it is controlled at 180 to 200 °C. As long as the total thickness of the bag is increased, the heat sealing temperature must be increased accordingly. B, heat sealing speed is too fast Sealing is not related to the speed of the sealing machine. If the speed is too fast, the seal will be transferred to the cold pressure for cooling in the future, and naturally it will not meet the heat seal quality requirements. C, cold pressure rubber wheel pressure is not suitable There is one on each of the cold-pressing rubber wheels, and the pressure between them should be moderate. When adjusting the pressure, only the spring should be clamped. D, there is a problem with the quality of the heat seal film Sealing is not related to the quality of the heat-sealing film. If the corona treatment of the composite lining is not uniform, the effect is not good, and it appears at the sealing place, and it is certainly impossible to seal. This situation is rare, but once it appears, the product is bound to be scrapped. Therefore, in the color printing and packaging industry, it is the next process of supervision of the next process. Once the quality problem is discovered, the cause must be analyzed and solved in time. If there is moisture or dirt in the seal, it will also cause the seal to be weak. In short, to solve the problem of the first type of sealing is not strong, generally can properly increase the heat sealing temperature, and then reduce the heat sealing speed, while increasing the pressure of the cold pressure rubber wheel. 2 Under the pressure of the sealing knife, although the bag mouth is sealed, but the force is squeezed or peeled off slightly, the sealing will crack again; A, the heat sealing temperature is not enough Simply raise the heat seal temperature to solve the problem. B, the surface of the heat sealing knife is not flat enough The heat sealing knife is divided into two upper and lower pieces, and a thermocouple is usually installed therein to sense the temperature transfer. There are three screws on the heat sealing knife. The middle screw acts as a support and reinforcement blade. The other two screws are equipped with pressure springs and washers, which are mainly used to adjust the pressure of the heat sealing knife. The upper and lower blades each have two springs. . The main reason for the unevenness of the heat-sealing knife surface is that the intermediate screw is inclined, not horizontal; or the pressure spring pressure of the upper heat-sealing knife is uneven. The solution is to recalibrate the position of the intermediate screw so that it is level. If the upper and lower heat-sealing knives are unbalanced, it should be realized by adjusting the pressure springs, and the adjustment can be moderate. When the spring is retracted, the heat seal knife will fall down; when the spring of the lower blade is tightened upward, the heat seal knife will move upward. C, cold pressure rubber wheel pressure uneven Uneven pressure of the cold-pressing rubber wheel will also cause such a seal to be insecure, and the solution is similar to the first case. 3 When the peeling test is carried out on the sealing part, half of the sealing is firm and half separated. The quality of the sealing of such a bag is still unsatisfactory, because the contents are easily leaked by being squeezed during storage and transportation. A, heat seal knife pressure uneven or cold press knife pressure uneven The adjustments on the heat seal knife and the cold press knife are identical. B, the surface of the heat sealing knife is not flat enough Article source address: http://
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