Labelless shaftless die-cutting technology

At present, the business undertaken by the label printing enterprises has the characteristics of multi-category and small-batch production. A flexo printing machine is equipped with a large number of die-cutting tools with different repetition perimeters to accommodate different sizes of jobs. Large quantities of products use round hob die cutting methods, round knife production cycle is long, the price is more expensive. Low-volume products usually use off-press flat die-cutting after printing, which is slow and often affects delivery time. Because the printing link and die cutting do not match, many label companies feel that the die-cutting link is the bottleneck of the entire production and they want to find new die-cutting solutions. At drupa exhibition in 2004, Omet company of Italy displayed the “Twin-cut double station” die cutting system on its unit type shaftless gearless drive flexo press. The innovative design of the system is The die-cutting segment of label printing companies provides a good solution.

The round-to-circle die-cut method of conventional labels uses an integral die cutter. When the die cut size or pattern of the job is changed, the label factory will need to remake the entire die drum. Over the long-term accumulation, the factory not only has to invest a lot of money to buy all kinds of knife rolls, but also the knife roll storage requires a lot of space and manpower. In recent years, a magnetic die-cutting cylinder technology has been adopted. The die-cutting cylinder is a magnetic steel roller that can be reused. The die-cutting cutter blade is easily installed and can be adsorbed on the magnetic bottom roller like a sticky tape. If the die-cut repeat perimeters of the two batches of jobs are the same, it is only necessary to replace the die-cutting blade when changing the live, instead of replacing the die-cutting drum, the die-cutting blade is much cheaper than the die-cutting drum. Using this technology, companies can save considerable costs. If the die-cut repetition perimeters of the two batches of jobs are different, companies will not only have to replace the die-cutting blade but also need to purchase expensive magnetic bottom rollers. There are still many limitations.

Based on the "Twin-cut duplex" die-cutting system with no shaft drive technology, two die-cutting stations are used. Each group of stations is equipped with a 33-inch magnetic die-cutting cylinder, which can be applied to different die-cutting repeat lengths between 10-33 inches. That is, when a company replaces a different job, no matter what size the product is, it is no longer necessary to replace the magnetic die-cutting cylinder. It is only necessary to replace the die-cutting blade. Before the die-cutting operation, the die-cut repetition perimeter of the product is first input into the machine's central control system. After the computer optimizes the calculation, the rotational speeds of the two sets of die-cutting drum motors are adjusted. When die-cutting, the die-cutting rollers directly driven by independent motors are used. Variable speed rotation, two sets of die-cutting drums complete a die-cutting operation with one quick and one slow rotation.
1. Die-cutting does not affect the printing speed of the machine. The printing speed during production is kept constant. The two groups of die-cutting drums rotate at a variable speed. The die-cutting roller linear speed is the same as the linear speed of the plate cylinder during effective die-cutting. The die-cutting section does not Limit the production speed of the machine. Open book. Rewinding, printing, and die-cutting processing speeds are kept constant. Die-cutting does not require batch-type feeding, as in flat die-cutting, which ensures printing. Die-cutting registration accuracy.

2. It is not necessary to remove the magnetic die-cutting drum from the die-cutting frame when replacing the work piece, and no additional auxiliary tools such as a crane are required. It can be operated on the machine when changing. The operator simply removes the die cutter blade from the magnetic bottom roller and replaces it with another die cutter blade. The heavy lifting of the traditional die-cutting rollers was eliminated and the risk of knife-edge cutting of the die-cutting roller was avoided, reducing the labor intensity of the operator and reducing the non-production-ready time.

3. It is no longer necessary to purchase expensive die-cutting cylinders of different sizes. Only relatively cheap die-cutting cutters need to be purchased, which reduces the company’s investment in equipment. Companies do not have to invest too much manpower and warehouses to handle and store modules. Cut the drum. And the die cutting time is relatively short, which is also beneficial to shorten the delivery time of the product.

4. The die-cutting station of the "Twin-cut duplex" die-cutting system can still use the conventional die-cutting cylinder. Before the die-cutting, the die-cutting motor rotation speed can be set to the value of the plate cylinder motor rotation only in the machine central control system. It can be consistent. This ensures that the company's traditional die-cutting tools can continue to be used without causing too much waste.

5. The "Twin-cut duplex" die-cutting system can also be used for die-cutting of folding cartons. According to the characteristics of paper jam, each group of die-cutting stations needs to use two magnetic die-cutting rollers, and adopt shear-type yin and yang die-cutting cutters to die-cut cardboard with different thicknesses, which enables enterprises to print on the same machine. , processing and packaging products, business scope has been expanded.

The application of shaftless transmission technology on flexo presses has ensured the product quality of label printing companies, increased production efficiency, increased production flexibility, reduced the company's production costs, and the machine operation is simpler, printing on labels. Enterprises have built a broader production platform.