Barcode Printing Technology Solutions for Plastic Packaging (7)

7. Electrostatic fault

Electrostatic static failure refers to whiskered ink caused by static electricity. If the electrostatic whisker ink occurs on the bar of the bar code, the edge roughness of the bar will not meet the requirements and the reading effect will be affected.

Cause: The plastic film is a poor conductor of electricity and generates static electricity during the printing process (movement, friction, peeling, etc.) and affects the transfer of the ink. Electrostatic faults often occur in dry winter months.

Solution:

(1) Using static eliminators;

(2) Micro-water or air humidifier in the printing workshop to increase the humidity;

(3) Eliminating electrostatic grounding on the guide roller. (Although the guide roller is a good electrical conductor, the lubricant in the bearing often turns the guide roller into an insulator again).

(4) Improve the working viscosity of the printing working ink.

(5) Ground immediately after printing.

(6) Contact the film and ink manufacturer to add an appropriate amount of antistatic agent to the ingredients. (Excessive use of antistatic agents will affect the fastness and composite strength of the ink).

8. Inaccurate size

In the process of printing and post-press compound bag making, if the processing conditions are not suitable, such as too high drying temperature and too much tension, the film will be deformed to stretch or shrink, and accordingly the bar code will also be deformed. Especially for stretchable films such as polyethylene, special attention should be paid.

the reason:

(1) Improper process conditions such as film tension.

(2) Bad film flatness.

(3) Roller roll accuracy is poor.

Solution:

(1) Accurately adjust the tension of the retracting roll to avoid film stretching

(2) Adjust the diameter difference of the roller and adapt the tension.

(3) Replace wrinkled or ruffled film

(4) Confirm the accuracy, circumferential accuracy and parallelism of the roller.