Label Printing Processing (4)

Failure 3: The waste paper was peeled off together with the edge of the paper. Cause: Die-cutting pressure was uneven, causing inconsistency in the depth of die-cutting. Some of the edges were not cut off; the use of the die plate was too long; the blades were too blunt, resulting in the surface material being dulled. Pressed into the bottom paper but not cut off; The right speed of the machine is unsuitable, too slow or too fast, which affects the waste discharge; The waste paper edge is too narrow, and the label dropping phenomenon occurs at the time of breakage; The waste edge angle of the paper edge is not suitable. Insufficient adhesive material; the release force between the base paper and the tissue paper is too small; the label area is too small, and the arrangement method is not suitable; the temperature in the production workshop is too low for contempt, and the adhesive performance is changed.
The solution to the problem is:
1, adjust the die-cut version, improve die-cutting accuracy, paste the sponge in the layout;
2. Change the speed of the machine, adjust the waste angle of the paper edge or replace the waste roller;
3, the use of adhesive force appropriate release material, and a reasonable arrangement of waste side width;
4, to maintain the rate of salt in the workshop 龋Chu Xia curtain 啬芪榷ā?br>
Fourth, coating failure and troubleshooting UV glazing in the common quality problems are:
1. After glazing, after a period of time, the printed material will be yellowed, red, and change its color;
2. The printed surface is not bright; pleats or streaks appear;
3. The glossy surface is sticky and not smooth;
4, glazing layer is not strong, out of ink, there are bubbles, pits and so on.
The solution to the problem is:
1. Use high quality, effective period of varnish;
2. Reasonably control the amount of varnish, neither too little nor too much, should pay attention to the leveling effect;
3. Pay attention to the printing quality of the bottom ink and require that the amount of ink be printed and printed, and do not dry it;
4, according to the actual situation of the coating surface to adjust the viscosity of the coating oil;
5, the correct adjustment of the surface tension of the coating oil, so that it is less than the surface tension of the ink, you can add a low surface tension solvent or surfactant;
6, to avoid the ink layer crystallization, if necessary, it can be surface treatment;
7, adjust the speed of the machine, the amount of glazing oil, drying energy relationship.
Fifth, film failure and troubleshooting 1 pattern hair virtual, poor adhesion of film and printing products Causes: the surface of the coating roller is defective, the hardness is too low, and the coating roller pressure is not enough, or the coating roller and the bottom roller is not parallel, will Caused by this failure; and printing ink layer is too thick or film is not yet dry film, or the speed is too fast is also the cause of this failure.
The solution to the problem is:
1, increase the pressure of the coating roller;
2, adjust the parallelism between the two rollers;
3, if the film roll itself has a problem, replace the film roll;
4, reduce the speed or change the ink composition.
Fault 2 Pattern surface with indentation pit Cause: The surface of the lamination roller is not clean or has been worn out. Solve the problem. Make sure that the surface of the printed material is wrinkled. Cause: The composite film is too thick. Loose or base paper tension is too large, and both sides of the composite film inconsistent tension will lead to this failure.
The solution to the problem is:
1, tension composite film;
2, reduce the bottom paper pull;
3, switch to a suitable composite film.
Failure 4 labels are stuck on the bottle. Causes: The paper is too thin or the composite film is too tight. It is easy to make the printed material warp. However, the composite film is too thin or has quality problems. It is difficult to avoid faults.
The solution to the problem is:
1, to avoid the thin paper film;
2. When the composite film tension is large, it is necessary to use a composite film with a small peel force or a backing paper.
3, when the sheet is covered with film, the tension direction should be perpendicular to the label bending direction;
4, to control the film tension, pressure, speed, in order to ensure the accuracy of the film;
5, film suitable for small format labels, flat paste, large-format labels suggest the use of coating process;
Failure 5 patterns within the blistering, white reason: when the ink layer is not yet dry when the film is covered, the ink layer is too thick, the film pressure is not enough, the composite film is too loose or uneven thickness will lead to this failure.
The solution to the problem is:
1, increase the composite pressure;
2, replace the composite film or adjust its tension.
Six, bronzing failure and exclusion. (To be continued)