If you are in the sea of ​​business, you have to make money. You must use limited resources to produce products that satisfy customers and generate revenue. In order to ensure a competitive advantage, you need to find various methods to increase productivity, such as reducing pre-press preparation time and costs, reducing consumption, improving printing quality, reducing anilox roller replacement and reducing related printing costs. But if you want to find a miraculous and comprehensive solution without any effort, it is impossible. So where do you start? Every step of the production process should be evaluated in an orderly and objective manner, an important one of which is the evaluation of the anilox roller.
What is the evaluation of the anilox roll? The traditional definition is that an experienced technician uses complex and expensive inspection equipment to comprehensively test the line number, cell volume and cell structure of the anilox roller and write a test report, which includes a microphotograph or Color schematic diagram of digitally processed cybernet outline. The report includes many numbers and graphs, but there is very little practical information.
Although it is helpful for the operator to understand the anilox volume of the anilox roller, are you satisfied that only the anilox roller has been worn or damaged after inspection? Do you want to know the reasons that may cause damage to the anilox roller and how to prevent damage? The anilox roller is the heart of the flexo printing machine and the focus of attention. Traditional inspections cannot tell the operator why the anilox roller is damaged, nor can they make suggestions to improve the printing quality. So you should ask yourself: what exactly do you want from the evaluation of the anilox roller.
Subject of evaluation
The evaluation of the anilox roller during the printing process is more effective than the occasional anilox roller inspection. The correct evaluation content includes the strict evaluation of the entire process of the storage, cleaning, use and working conditions of the anilox roller, which can provide a series of solutions to improve the printing status and prevent process failures. The view that the evaluation of the anilox roll should be done by an outsider (technologist sent by the anilox roll manufacturer) is wrong. In fact, the evaluation of the anilox roller is an important part of improving the printing quality. Obviously, the technicians sent by the anilox roll manufacturer to conduct an anilox roll evaluation in the printing workshop for several weeks are unreasonable, and the appropriately trained printer operators can fully use the anilox roll in their daily work Condition monitoring.
Tools for evaluation
1. Specially designed inspection area
A fixed workbench of appropriate height should be prepared for the operator. It is more ideal if it is close to the cleaning device.
2. Seat frame for supporting anilox roller journal
The seat frame can support the anilox roller so that its surface does not come into contact with the table surface of the worktable, which is also conducive to a comprehensive and safe inspection of the surface of the anilox roller. The frame should be equipped with bearings so that the anilox roller journal can rotate in it. In addition, grooved wooden brackets can also be used to support the anilox journal. However, when using a wooden bracket, it is best to fix it on a base with a large weight and volume to prevent the wooden bracket from accidentally tipping over.
3. Good lighting
Good lighting is extremely important in anilox evaluation, but it is often easily overlooked. In many printing shops, the so-called good lighting is to install several fluorescent lamps above the inspection area. A better practice is to draw a separate area and illuminate it with a light source that is comparable to the lighting conditions in the inspection area, so as to conduct a comparative test on the printed sheet.
Other tools that need to be prepared include a gear rack, a 100x optical magnifying glass, a tape measure, a marking label (for marking damaged areas), a retractable scraper (for scraping off the dry matter on the end of the anilox roller), and medium coarse teeth File (used to remove burrs from the keyway). A micrometer of 10,000 inch is used to detect the wear of journal and bearing surface. If the anilox roller journal has a threaded stop, it is best to purchase a set of thread inspection tools (used to check the threaded portion of the journal).
In addition, a set of numbering dies and hammers are needed to mark the anilox roller. Most of the anilox rollers have been printed with serial numbers by the manufacturer when they leave the factory, but after repeated cleaning treatments for the anilox rollers several times, the numbers and other numbers will become blurred. Especially if the side scraper is used, the end face of the anilox roller may be excessively worn, which makes the original number and the number of anilox lines blurred. Therefore, the anilox roller needs to be reprinted after a period of use to ensure that important information is clearly visible.
It is also important to distinguish the anilox roller by the serial number and anilox number recorded in the record book. Any damage or defects on the surface of the anilox roller should be recorded in the record book, and the damage location and the degree of damage should be clearly marked. The contents recorded in the record book can enable the operator to quickly understand the status of the anilox roller and know which anilox roller needs to be processed first. If the same type of damage occurs on more than one anilox roller in the record, the operator should be alerted and the cause of the anilox roller damage should be investigated in depth.
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