A typical sealing machine consists of a frame, a speed reduction and transmission mechanism, a sealing and printing mechanism, a conveying device, and an electrical and electronic control system.
When the power is turned on, each mechanism begins to work. The heating elements heat up rapidly, causing the upper and lower heating blocks to reach the desired temperature. The temperature control system adjusts the temperature to the required level. The printing rollers rotate, and the cooling system activates as needed. The conveyor belt rotates, and the speed is adjusted to the required speed by the speed control device.
When a package containing goods is placed on the conveyor belt, the sealing portion of the bag is automatically fed between the two moving sealing belts and into the heating zone. The heat from the heating blocks is transferred to the sealing portion of the bag through the sealing belts, softening the film. The film then passes through the cooling zone, where the surface temperature decreases appropriately. Afterward, the film is rolled by a knurling wheel (or printing wheel), causing the upper and lower plastic films to adhere and pressing out a mesh pattern (or printed markings). Finally, the sealed bag is conveyed out of the machine by a guide rubber belt and the conveyor belt, completing the sealing operation.