Plastic film color drift is a common fault of soft packaging plant. It is mainly divided into two cases: the change of printing registration in the vertical direction (the direction of the transport side) and the unstable registration of the horizontal registration. Today, let ’s focus on the four main reasons for the change in printing registration in the vertical direction (the direction of the transport side).
1. Tension changes during film traction
Reasons: Improper modulation of the roll brake of the unwinding device; too much roll material, or the diameter of the formed material is too large; improper setting of the speed of the three rollers; the surface friction on the surface of the three rollers decreases; the tension of the rewinder changes.
Countermeasure: Check and adjust each control device.
2. Poor diameter difference of printing plate cylinder
Cause: The increase in the diameter difference during plate making is inaccurate.
Countermeasure: Measuring the diameter difference (method: see the plate making section).
3. Abnormal rule line
Cause: Insufficient density (dense), offset printing, etc.
Countermeasures: Adjust the sensitivity of the photoelectric cell, and manually eliminate the disadvantages such as paste printing.
4. The diameter of the plate cylinder is small
Reason: The accuracy of overprinting of smaller roller diameter is difficult to control.
Countermeasure: The printed composite packaging bags shorter length, make-up method may be employed, i.e., one printed on the roll printing two or more bags.
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