Using Magnetic Rollers and Flexible Blade Frequently Asked Questions (Part 2)

What is the difference between a flexible blade used on an interstitial rotary machine and a flexible blade used on a full rotary machine?
The manufacturing principles and methods of these two types of flexible blades are exactly the same. It is only different when designing and final trimming. Most of the flexible blades used in full-rotation machines cover all of the magnetic roller bodies to match the synchronization of all-round rotary printing and die-cutting. Most of the flexible blades used on the gap type rotary machine cover the part of the magnetic roller body to match the forward and backward type of material on the gap type rotary machine. Since the flexible blades used on the gap type rotary machines are often designed with smaller blade sizes or fewer lines, they are less expensive. At the time of ordering, the user is required to give the manufacturer similar details as the flexible blade used on the full turn machine, such as the line drawings and die-cut material details.
What is the difference in the life of a flexible blade compared to engraving a circular blade?
In normal circumstances, a flexible blade will have less than a full hardened circular blade, but because of the excessive wear of the blade, the customer uses a flexible blade to make the number of die cuts that are close to the round blade. There are also many examples. Depending on whether the wear is natural or impact wear, if the wear is not great, the cut tissue is easy to cut. The flexibility of the flexible blade is reflected: the user can add a thin layer of paper, film or coating to the bottom of the blade. The upper layer of ink can be temporarily cut at the place where it was not cut, so that the bulk goods to be chased can be finished first. If the engraved round knife can only be returned to the mold factory for repair under the same conditions.
What is the difference between the layout of the flexible blade and the engraved round knife?
The typesetting design of the flexible blade is in principle the same as that of the engraved round knife. However, because the blade height of the flexible blade is shorter than that of the engraved blade, the pitch of the blade can be made smaller and the rounded corner can be made smaller. The principle of the minimum diameter of the roller should also be followed in the typesetting, and as many cutting lines as possible should be avoided at the same time.
Is it possible for users to use magnetic cylinders and flexible blades in different manufacturers?
Yes, but conditional. If the user's web has been equipped with magnetic rollers, but wishes to use a different manufacturer's flexible blade, the flexible blade manufacturer must know the diameter of the pillow of the original magnetic roller and the diameter of the roller body. Some magnetic roller suppliers in foreign countries often have the rules and error ranges that they have followed for many years. Even without their exact QC data, flexible blade manufacturers can infer the pillow diameter and barrel diameter, and then create a flexible blade to match if the user cannot measure it. But for those other magnetic roller manufacturers that have no rules to follow, in addition to providing QC data or measuring themselves, flexible blade manufacturers have speculated ways to design and manufacture flexible blades with precision requirements in the range of a few microns. And the possibility of mistakes is great. To ensure the close cooperation between the two, users generally use magnetic rollers and flexible blades from the same supplier.
Does the flexible blade need to be pinned to the magnetic roller?
It is generally not recommended nor need to use pin positioning. However, some special tasks, such as the use of magnetic cylinders with relatively small diameters by label manufacturers, are particularly complex in the shape of the die-cut and many lines, in addition to the magnetic roller itself should be installed super magnetic block, pin positioning can completely avoid the flexibility The possibility of sliding on the surface of the roller body of the magnetic roller due to die cutting resistance.
How to install the flexible blade on the magnetic roller accurately?
The operator can normally place the flexible blade next to the machine on the magnetic roller. The roller of the magnetic roller has a horizontal line for alignment, and the flexible blade also has horizontal and circumferential alignment lines, which has facilitated the alignment between the two. Then, the attached flexible blade and magnetic roller are put on the bearing sleeve, and the die-cut seat is mounted like a fixed round knife. Sometimes, for the convenience of the operator, the magnetic roller is first mounted on a die-cut seat, and then a flexible blade or a changeable position is attached to the machine. There is nothing wrong with this method of operation, but it needs to be done with special care so as not to rub the knife edge against the other parts of the die-cutting seat.
Can flexible blades be used without cost savings on magnetic rollers?
This is not generally recommended. If you try to use a common metal roller without a magnetic roller, whether it is stuck on the back of the flexible blade with double-sided tape, or sticking the edge of the flexible blade on the metal roller with tape, you can't make the flexible blade stick tightly. On the roller. The result is a flexible blade with a height error of only a few microns. Due to the gap between the back of the blade and the roller at the time of pad printing, the phenomenon of uneven die cut depth occurs. This is the case when more and more applications of automatic labeling are in use today. Unacceptable die-cutting quality.
What is the difference between flexible blades with back grinding or back grinding?
Flexible blades have not been accompanied by the application of back-grinding technology when they were just used. Later, manufacturers who started using back-grinding technology found that back-grinding can better control the overall height of the flexible blade, and regard back-grind as the highlight of its marketing. In fact, it was at that time that the CNC could not control the height of the blade at one time, but used a back-grinding tool to adjust it. Rothley flexible blades are introduced into Europe's most advanced CNC processing equipment, and once formed blades are not adjusted for back grinding in most cases. However, due to the uneven thickness of the die cut material, especially the backing paper, back grinding cannot be avoided in some cases. The back-grinded flexible blade is not much different in quality from a successfully-formed blade without back-grinding. (To be continued)