Frequently Asked Questions about Using Magnetic Rollers and Flexible Blades (2)

Q: What is the difference between the split type and the conjoined type magnetic roller?

A: The split design means that the shoulder is detachable, and the heat treatment to 60 to 62 Rockwell hardness has ensured the wear resistance of the shoulder. The shoulder can be disassembled and replaced after several years, and the original shape can be restored as much as possible without wasting the original flexibility. blade. The integrated design refers to the pillow shoulder and the roller body as one material. The advantage is that the production cost is slightly cheaper and the production time is relatively short. The Rottery Magnetic Roller adopts the split design popular in Europe and Japan.

Q: Can the magnetic roller be repaired?

A: Yes, but it must be inspected by the manufacturer first. Depending on wear and damage, the usual repairs are to replace the pillow shoulders, repair the roll body, correct the concentricity of the shaft, etc.

Q: Can users order magnetic rollers and flexible blades from different manufacturers?

A: Yes but with conditions. If the user's rotary machine is already equipped with a magnetic roller, but wants to use a flexible blade from another manufacturer, the flexible blade manufacturer must know the shoulder diameter and roller body diameter of the original magnetic roller. Some foreign magnetic roller suppliers often have rules and error ranges that they have followed for many years. Even without its exact QC data, and without the user being able to measure it, a flexible blade manufacturer can infer its shoulder diameter and roll body diameter, and then manufacture a flexible blade to match. But for other magnetic roller manufacturers who have no rules to follow, in addition to providing QC data or users' own measurements, flexible blade manufacturers use speculative methods to design and manufacture flexible blades with a precision range of several microns. And the possibility of error is high. In order to ensure a close fit between the two, users generally use the magnetic roller and flexible blade from the same supplier.

Q: Does the flexible blade need to be pinned to the magnetic roller?

A: It is generally not recommended or necessary to use pins for positioning. However, for some special jobs, such as label manufacturers use magnetic rollers with a relatively small diameter, the die-cutting shapes are particularly complex and multi-line. In addition to the magnetic roller itself, a super-strong magnetic block should be installed, and the pin positioning can completely avoid flexibility. The possibility of the blade slipping on the surface of the magnetic roller body due to die cutting resistance.

Q: How exactly is the flexible blade placed on the magnetic roller?

A: Under normal circumstances, the operator can first stick the flexible blade on the magnetic roller next to the machine. There is a horizontal welt line on the roller body of the magnetic roller for alignment, and the flexible blade also has horizontal and circumferential alignment lines, which is convenient for the alignment of the two. Then put the pasted flexible blade and magnetic roller on the bearing sleeve, and install the die-cutting seat like a fixed circular knife. Sometimes the operator installs the magnetic roller on the die-cutting seat for convenience, and then attaches the flexible blade or changes the position on the machine. There is nothing wrong with this method of operation, but special care needs to be taken to prevent the blade from hitting other parts of the die-cutting seat and wear the blade.

Q: Can the flexible blade save cost and not use the magnetic roller?

A: This is generally not recommended. If you try to use a normal metal roller instead of a magnetic roller, either double-sided tape to the back of the flexible blade or tape to tape the edge of the flexible blade to the metal roller will not make the flexible blade fit tightly on the rollers. The result is a flexible blade with a height error of only a few microns, with uneven die-cut depth due to the gap between the back of the blade and the roller when applying the plate, which is the case in today's increasing use of automatic labeling Unacceptable die cut quality.

Q: What is the difference between back grinding or back grinding for flexible blades?

A: The flexible blade was not accompanied by the application of back grinding technology when it was first popularized. Later, manufacturers who began to use back grinding technology found that back grinding can better control the overall height of the flexible blade, and regarded back grinding as the highlight of their marketing. In fact, at that time, the CNC could not control the height of the blade at one time, but had to use back grinding to adjust it. Rottery flexible blades have introduced advanced CNC processing equipment from Europe. In most cases, the blades formed once do not need to be adjusted by back grinding. However, due to the uneven thickness of the die-cut material, especially the backing paper, back grinding cannot be avoided in some cases. The quality of the flexible blade after back grinding is not much different from that of the one-shot blade without back grinding.