Using Magnetic Rollers and Flexible Blade Frequently Asked Questions (I)

Description: Many users still have questions about how to properly use and maintain magnetic rollers and flexible blades. The following questions and answers are summarized in the Asia-Pacific region, many trademark manufacturers, many years of use of magnetic roller and flexible blade often encountered and raised questions and answers.
Content: Is the magnetism of the magnetic roller electromagnetic and can be turned on and off?
Magnetic rollers use high-strength permanent magnets, high-quality steel and high-performance viscose to ensure long-term magnetic stability. The magnetic roller constituted by the permanent magnetic block is safe and reliable in the die cutting of the rotary connection line, and does not have to worry about the sudden disappearance of the electromagnetic force to cause an accident at the time of high-speed operation.
How strong is the magnetic force of the magnetic roller?
After selecting the standard high-strength permanent magnetic block, the normal magnetic roller and flexible blade can withstand rotation speed of up to 300 meters per minute. Rothley magnetic cylinders place a super-strength permanent magnet on the surface of the roll body to make the lap of the flexible blade firmer and withstand higher-speed rotary die cutting.
Does the magnetism of the magnetic roller weaken?
If properly maintained and properly placed, there is usually no significant reduction in magnetism within 10 years. Some users of magnetic cylinders need maintenance after a few years. The reason is not because the magnetic force of the magnetic roller is weakened, but because the pillow shoulder and the magnetic roller body are worn, or the roller is caused by improper pressure during use. Shaft bending.
Does the magnetic force of the magnetic roller affect other parts on the die cut seat?
The magnetic force of the magnetic roller extends only about 10 mm from the surface of the magnetic roller body, so it does not affect the other components on the die cutting seat. Of course, try not to make the magnetic roller body contact with other components, such as the bearing sleeve, the bottom roller, etc., in the device.
Does the magnetic force of the magnetic roller decrease as the diameter of the roller decreases?
In the case where the magnetic roller diameter is not less than the minimum recommended gear tooth number, the magnetic force does not become smaller as the roller diameter becomes smaller. However, it should be noted that the magnetic roller diameter must not be less than the manufacturer's recommended minimum size.
Is there a limit to the minimum size of the magnetic roller?
The smallest and safest size recommended by magnetic roller manufacturers is that the circumference of the roller is not less than the width of the machine. However, if it is necessary to use smaller sizes for various reasons, it is recommended that the 4:1 rule be followed: The diameter of the roller is not less than 1/4 of the width of the machine. Although the manufacturer can manufacture rollers smaller than 4:1, in order to smooth and even die cutting, to avoid buckling or even bending of the die, following the above rules will extend the service life of the magnetic roller as much as possible.
Does high temperature affect the magnetic roller?
The permanent magnetic block of a normal die-cut magnetic roller can withstand temperatures up to 150 degrees Celsius. However, it is recommended not to place it under high temperature over 80 degrees Celsius for a long time, and to avoid uneven surface due to the expansion of the adhesive. It should be noted that the normal die-cut magnetic roller cannot be used for hot foil holders. Hot stamping magnetic rollers must withstand temperatures of at least 240 degrees Celsius.
What is the difference between split and conjoined magnetic rollers?
Split design refers to the pillow shoulder is disassembled, heat treatment to 60 to 62 Rockwell hardness has ensured the wear resistance of the pillow shoulder, the pillow shoulder can be removed and replaced after a number of years, as far as possible to restore the original state without wasting the original set of flexible blades. Joint design refers to the pillow shoulder and roller body as a whole material, the advantage is that the production cost is a little cheaper, the production time is relatively short, but the disadvantage is poor pillow hardness is not wear, resulting in a shorter life cycle of the entire roller. Rothley magnetic cylinders use a popular split design in Europe and Japan.
Is the magnetic roller repairable?
Yes, but it must first be tested by the manufacturer. Depending on the conditions of wear and damage, the most common repair is to replace the pillow shoulder, repair the body, correct the shaft concentricity, and so on. (To be continued)