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Causes of the Sealer Machine's Weak Seal

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Reasons for the unsettled sealing of the sealing machine:

When we use the sealing machine, the sealing will be weak, so that we waste a lot of time and packaging materials in the packaging process, and even damage the product, which is troublesome for users. There are several reasons for the weak sealing of the sealing machine. We must deal with it in a timely and correct manner to return to normal production. Now let's take a look at the reasons for the weak sealing of the sealing machine.

(1) The heat-sealing temperature is not enough. Under normal circumstances, for composite bags with OPP as the lining, when the total thickness of the bag is 80~90μm, the heat sealing temperature should reach 170~180℃; for the composite bags with PE as the lining. When the total thickness of the bag is 85-100μm, the temperature should be controlled at 180-200℃. As long as the total thickness of the bag is increased, the heat sealing temperature must be increased accordingly. (2) The speed of the heat-sealing is too fast and the sealing is not good. It is also related to the speed of the sealing machine. If the speed is too fast, the sealing part will be transported to the cold pressing part for cooling treatment before it can be heated in the future, and naturally, it will not meet the heat sealing quality requirements. (3) The pressure of the cold-pressed rubber wheel is inappropriate. There is one upper and lower cold-pressed rubber wheel, and the pressure between them should be moderate. When adjusting the pressure, you only need to clamp the spring. (4) There is a problem with the quality of the heat-sealing film. The inability to seal the film is also related to the quality of the heat-sealing film. If the corona treatment of the composite lining is uneven, the effect is not good, and it happens to be at the sealing place, it will definitely not be able to be sealed. This situation is rare, but once it occurs, the product must be scrapped. Therefore, in the color printing and packaging industry, the next process is to supervise the previous process. Once a quality problem is discovered, the cause must be analyzed and resolved in time. If there is moisture and dirt in the seal, it will also cause the seal to be insecure. In short, to solve the first problem of weak sealing, generally, increase the heat-sealing temperature appropriately, then reduce the heat-sealing speed, and increase the pressure of the cold-pressed rubber wheel at the same time.

Ningbo Ronghua Digital Post Printing Equipment Co., Ltd. not only has pressure sealer machine but also paper jogger machine and many other products. Welcome to visit our official website.

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