In the process of film blowing machine, if we want to have quality controllable plastic bag products, we must control all processing links in place. Under normal circumstances, the processing of plastic film blowing machine is divided into feed heating, traction, control of compressed air edge. After filling the air hole of the membrane head with air, the gas is added to the middle of the round film, and the film is straight up. The size of the plastic bag is controlled by the amount of air blowing, and then the film is stabilized by the film stabilizer. The thickness is controlled by the main engine and the traction speed. It can be understood that the faster the main engine speed, the faster the feeding speed, the thicker the film, the traction is just the opposite, the faster the pull, the thinner the film, which is the main link.
In order to achieve a good horizontal and vertical tensile force of the blown film, it is necessary to achieve a certain ratio of blow-up ratio BUR and traction ratio DDR. If the improper ratio will cause the transverse tension to be reduced, if the film bubble is stable under the existing die and fold diameter, then there is no problem with BUR. If the film bubble is unstable, BUR is too large; DDR = die Mouth clearance / (film thickness × BUR)
To reduce the DDR, it is necessary to reduce the die gap. Reducing the BUR will only make the DDR larger. If the film is unstable when the film is blown, it means that the film head is too small. You can use a fixed frame to stabilize the film.
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