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Solutions to Five Common Faults of Bag Making Machine

Dec. 23, 2020

1.The stepper motor makes a strange sound when it is turned on, and the film cannot be sent.


(1) Check whether the direction of the main motor of the Bag Making Machine is correct, and adjust it to the correct direction indicated by the arrow.

(2) Whether the stepper motor driver shows failure, turn off the main power supply and re-energize it to return to normal.

2. The film feeding size varies during the working process, and the feeding size is more than 5mm shorter than the preset size, and there is no film feeding intermittently during the working process.


(1) The sensitivity of the photoelectric eye is not well adjusted or the polarity is incorrectly selected.

(2) The photoelectric switch should be replaced if it leaks electricity to the ground or short-circuits between terminals.

(3) The unwinding speed is lower than the feeding speed, it is necessary to loosen the film pressing strips, check the performance of the unwinding part, and troubleshoot.

Bag Making Machine

Bag Making Machine

3. The stepping motor torque is obviously reduced, and the bag size is not accurate.


The stepper driver of the Automatic Bag Making Machine is faulty, or the connection part of the rubber roller and the stepper motor is stuck. Check and repair the stepper driver in time, connect the rubber roller and the stepper motor.

4. Photoelectric tracking is not accurate when making bags.


(1) The adjustment method and working status of the photoelectric eye are not selected correctly. Correctly adjust according to the instructions.

(2) The pre-adjusted film feeding length (when adjusting the blank bag) is too far from the actual bag size, so you should reset the thread length or adjust the pressure and adjust the device.

(3) If the film resistance is too large or the quality of the products in the previous process is poor, the materials should be checked and replaced.

5. The feeding speed is low or the work is abnormal.


(1) The eye position switch is in poor contact or the cam angle is not good, should be adjusted or replaced.

(2) The thyristor or rectifier tube of the discharge speed regulating circuit board is broken down and should be repaired or replaced.

The Plastic Bag Making Machine and its processing objects, here we specifically refer to plastic films, have a mutually compatible feature, that is, a machine can only process plastic films within a certain range of properties. We are understanding the properties of plastic films. Basically, starting from the three elements of bag making, namely: pressure, temperature, and pressing time, the pressing pressure during bag making should be high, the pressing temperature should be low, and the pressing time should be long. The composite bag after such treatment is pressed The seal is beautiful, beautiful and upright.

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