- Why is the magnetic roller electromagnetic?
Answer: The magnetic roller uses high-strength permanent magnets, high-quality steel and high-performance adhesive to ensure the stability of its long-term magnetic attraction function.
- How strong is the magnetic force of the magnetic roller?
Answer: After selecting high-strength permanent magnets that meet the standards, normal magnetic rollers and flexible blades can withstand a rotary press speed of up to 300 meters per minute.
- Will the magnetism of the magnetic roller weaken?
Answer: If it is properly maintained and placed, the magnetism will generally not be significantly weakened within 10 years.
Some users’ magnetic rollers need to be repaired after a few years. The reason is often not because the magnetic force of the magnetic roller is weakened, but because of the wear of the pillow shoulder and the magnetic roller body, or the bending of the roller shaft caused by improper placement pressure during use.
- Will the magnetic force of the magnetic roller affect other parts on the die-cutting seat?
Answer: The magnetic force of the magnetic roller only extends to a distance of about 10mm from the surface of the magnetic roller body, so it will not affect other parts on the die-cutting seat.
Of course, try not to let the magnetic roller body contact other parts during installation, such as bearing sleeves, bottom rollers, etc.
- Does the magnetic force of the magnetic roller decrease as the roller diameter decreases?
Answer: When the magnetic roller diameter is not less than the minimum recommended number of gear teeth, the magnetic force will not decrease as the roller diameter decreases.
However, please note that the diameter of the magnetic roller cannot be less than the minimum size recommended by the manufacturer.
- Is there a limit to the minimum size of the magnetic roller?
Answer: The minimum and safest size recommended by the magnetic roller manufacturer is: the circumference of the roller is not less than the width of the machine. But if a smaller size must be used for various reasons, it is recommended to follow the 4:1 rule: the roller diameter is not less than 1/4 of the width of the machine.
Although manufacturers can make rollers smaller than 4:1, in order to ensure smooth and uniform die cutting and avoid die jumping or even bending, following the above rules will extend the service life of the magnetic roller as much as possible.
- Will high temperature affect the magnetic roller?
Answer: The permanent magnets of normal die-cutting magnetic rollers can withstand temperatures up to 150 degrees Celsius. However, it is recommended not to place them in an environment with a high temperature of more than 80 degrees Celsius for a long time to avoid uneven surfaces due to the expansion of the adhesive.
Please note that normal die-cutting magnetic rollers cannot be used for hot stamping seats. The high temperature that hot stamping magnetic rollers need to withstand must reach at least 240 degrees Celsius.
8. Can magnetic rollers be repaired?
Answer: Yes, but they must be inspected by the manufacturer first. Depending on the wear and damage, the most common repairs are to replace the shoulder, repair the roller body, correct the concentricity of the shaft, etc.
- How to accurately place the flexible blade on the magnetic roller?
Answer: Under normal circumstances, the operator can first stick the flexible blade on the magnetic roller next to the machine. There is a horizontal edge line on the roller body of the magnetic roller for alignment, and there are also horizontal and circumferential alignment lines on the flexible blade, which is convenient for the alignment of the two.
Then put the flexible blade and magnetic roller on the bearing sleeve, and install the die-cutting seat like a fixed circular knife. Sometimes, for convenience, the operator first installs the magnetic roller on the die-cutting seat, and then sticks the flexible blade on the machine or changes the position.
There is nothing wrong with this operation method, but you need to be particularly careful to avoid the blade from touching other parts of the die-cutting seat and wearing the blade.
- How is the life of a flexible blade different from that of a round engraving blade?
Answer: Under normal circumstances, the life of a flexible blade will be less than that of a fully hardened round blade. However, because there are too many factors that wear the blade, there are many cases where customers use a flexible blade to make a die-cutting revolution similar to that of a round blade, and the life is longer than that of a round blade (imported blades with thick coating).
It depends on whether the wear is natural wear or collision wear. If the wear is not serious and the surface paper to be cut is easy to cut, the flexibility of the flexible blade will be reflected: the user can add a layer of thin paper, film or a layer of ink to the bottom of the blade, and the place that was not cut originally can be temporarily cut, so that the batch of goods to be rushed can be completed first.
If the round engraving blade is in the same situation, it can only be returned to the mold manufacturer for repair, which will incur time and repair costs.
- Can the flexible blade be repaired after it is worn?
Answer: In most cases, no. In addition to the above mentioned cases, add a layer of thin paper, film or apply a layer of ink on the bottom of the blade for temporary adjustment.
Although the blade can be slightly repaired if it is returned to the original factory, it is generally not recommended to do so because the flatness of the blade cannot be guaranteed, and it is difficult to ensure that the marks on the base paper after cutting are uniform.
