Give you a Ferrari, but you open out the Alto's bumpy feeling, the quality of flexo can't be improved, but you can't blame the equipment. Many times, the quality of flexo printing has a lot to do with the details. After you notice, you earn, pay attention to not Come, this article will save your life! When 650 6 flexographic color printing machine operation, a fault in the use of several operators, seriously affect the normal operation of the machine. I am sorting out and I hope that everyone can promote each other.
Question 1: Use of the knife sponge
In general, a high-precision die cutter or a cross-cutting cutter body of a post-press process is provided with a compression sponge, which has various specifications. The knife sponge is rubber on one side and rubber sponge on one side, and its thickness is 1.6mm. After the knife is finished, the blade is invisible. Its main function is: 1 maintain a tension, this tension is achieved by the friction between the knife sponge and the material to be printed, solving the problem of longitudinal die cutting. 2 The flexible knife sponge ejects the die-cut material from the empty portion of the die cutter.
The "Dexin" flexo printing machine has the functions of high-speed glazing and automatic slitting point tracking, as well as non-stop double-station discharge and normal 6-color front and counter marking printing. The high-speed glazing paper path is up to 60 meters long and has a high temperature of about 100 degrees. Therefore, the temperature has a serious influence on the service life of the knife sponge on the blade body and the fastening property of the adhesive layer, and the tension of the printing material is randomly generated due to the influence of the quality change of the knife sponge. Compared with the six-cutting cutter of the post-press die-cutting section, it is very difficult to adjust the tool position under high-speed operation. Sometimes the cutting error is 2mm, and the printed product produces a large amount of waste and defective products.
When adjusting the machine on site, it is found that the operating frequency of the tool position is used: about 6 adjustments per minute after noon every day, which is much larger than the frequency of use in the morning (because the temperature of the whole machine is relatively low in the morning). Therefore, the blade sponge of the cut portion is forcedly air-cooled. As a result, the situation has improved, the use time of the knife sponge has been lengthened, the reject rate has decreased, the frequency of the operator adjustment has decreased, and the operation intensity has decreased.
Therefore, attention should be paid to the quality and use of the sponge. At the same time, pay attention to the selection of the knife sponge. When selecting a suitable sponge, test it within the specified time and measure the difference between the height restored by the sponge and the original height. The good sponge is the same as the original. The elastic height, density, and hardness are not appropriate, and it is difficult to effectively press the paper during die cutting. The sponge should be higher than the blade and can be adjusted by different materials. In principle, the density is large, the height should be small; the density is small and the height should be large.
The quality characteristics of the sponge are expressed as: 1 rebound speed. 2 long-lasting rebound ability (height difference). 3 compression density.
Question 2: Adjustment of the paper table
In the post-press die-cutting section, the clamp-type high-speed stacking table consisting of double-layer nylon belts, the die-cutting material sent out by the output part, to the slow collecting table for collecting the stacks, the papers are smoothly stacked and arranged neatly. , the count is accurate.
When the six-card playing card cut-off paper (240 g sandwich paper) was collected, the work surface of the work surface was very messy, and it was impossible to carry out normal collection, which caused great waste of materials and personnel. After analysis, it is considered to be the mess caused by the angle of paper exit. The debugging personnel and the operator are not thorough in the on-site handover, and the angle of the collection table is adjustable, according to the area and weight of the paper. 2 machine speed to carry out.
After adjusting the angle of the collecting table, the operator receives the paper neatly, and the post-order personnel are busy and not chaotic.
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