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How to solve the burr on the edge of the adhesive label?


In the process of label die-cutting, many failure problems are often encountered, such as labeling, burrs on the edges of the label, the adhesive layer is not completely cut, the cut is too deep, the die-cutting blade is glued, and the waste is broken. It will directly affect the subsequent steps of label processing, and even lead to defective label products, and face the risk of being returned.
ThisTo this end, the author will comb through several die-cutting faults and troubleshooting methods commonly used in the label die-cutting process based on the maintenance experience accumulated by visiting major label printing companies for many years, to readers.
Trouble 1: Die-cut labeling and troubleshooting
There are many factors that affect the labeling of die cutting. The more common factors are the following:
(1) Material problems, uneven thickness of the backing paper, and too little surface peeling force;
(2) The glue layer is thick. After die cutting, the waste is pulled up after a long distance, and the glue layer sticks back;
(3) Die cutting paper feed direction and waste angle are not reasonable (the waste angle is not applicable to every material);
(4) The die cutting blade is not sharp enough, and the material or rubber layer is not completely cut;
(5) The flatness of the die cutter is not enough, or the cutting edge of the cutting line is damaged; a small gap appears;
(6) The cutting edge angle of the die cutter does not match the material used, and the cutting edge angle of the film and paper should be different;
(7) When flexible blades are used, the processing accuracy of magnetic rollers (low pass rate) results in large tolerances on the magnetic surface diameter;
(8) Magnetic roller wear, bottom roller wear, and bottom roller processing accuracy issues (the middle section of the bottom roller is smaller in diameter than the two ends);
(9) The machine printing width is wide, the diameter of the magnetic roller and the bottom roller is small, and the pressure roller is deformed;
(10) During low-speed and high-speed production, the stability of the side plates of the machine is poor, and the machine generates vibration;
(11) The magnetic roller and the bottom roller run out (the roller shaft head is not concentric with the roller, the shaft head is worn, the bearing is worn, etc.).
Method of exclusion:
(1) Choose materials with guaranteed quality. If the materials cannot be replaced due to price, you must make sacrifices on the cuts. You cannot have both fish and bear's paw;
(2) Reduce the length of the paper path after waste discharge. Many hot glue and thicker materials need to be lined up to minimize the possibility of labeling, so as to avoid sticking.
(3) The waste discharge angle should be as large as possible, opposite to the paper feed direction, and the thinner the waste edge roller, the better;
(4) Choose die cutting tools with high cutting edge hardness as far as possible to avoid excessive wear of the blade tip when cutting the film and synthetic paper materials with the cutting edge, and can not completely cut (variable pressure break) the designated material layer and cause the phenomenon of labeling;
(5) If the fixed position is marked during die cutting, it is necessary to detect whether the cutting edge is damaged at the corresponding position of the blade. If it is a magnetic blade, you can turn the blade direction by 180 ° to determine whether the position of waste discharge changes with the blade.
(6) Select different blade angles according to the type of material. Films, coatings and very tough materials all need to use small angle blades for die cutting (larger blades with shorter angles have shorter life);
(7) Due to price and processing technology issues, imported blades are much better than domestic tools in terms of flatness and durability. If the quality of the order is very high, and you are more concerned about the problem of cut marks, you should use imported tools as much as possible (in my follow-up article) Will share in detail the differences between imported and domestic tools);
(8) Regardless of whether the diameter of the magnetic roller, the knife roller, or the bottom roller is too small, there is a risk that the material will slightly deform against the blade after pressure, especially the blade wear, the width of the printing machine, and the roller too. Thin, it is very easy to cut materials at both ends and burrs or labels in the middle. This is a problem that is easily overlooked by the operator and should be taken seriously.
(9) For labeling problems caused by machine vibration and roller runout, you need to find a professional machine supplier or an engineer of a die cutting tool supplier to measure, and exclude hidden factors such as roller wear, bearing wear, and