The folding roller is the most important part of the folding machine. Whether it is a fence-type folding machine, a blade-type folding machine, or a hybrid folding machine, the folding roller is an indispensable core. There are various folding rollers on the market, but which one is the best? Which can provide higher quality service for more kinds of printed materials?
For the modern bookbinding industry, the key factor that determines the suitability of folding rollers is the grip. Coated paper, glazed paper, peritoneal paper, and heavy ink on the paper all pose challenges to the quality of folding. If the folding roller does not have enough grip, it is difficult to accurately control smooth paper and ultra-light thin paper.
Other important factors worth considering include the durability of the folding roller, repair and reinstallation costs, and whether it may leave unpleasant marks on the folding product.
Type of folding roller:
Steel-Steel folding rollers are durable and inexpensive, but are not practical in many situations today. The folding roller will have insufficient grip due to the unevenness of the steel surface, and it cannot control coated paper and other various smooth papers.
Indentation is a common problem. The paper needs to be controlled with strength, and the pressure between the folding rollers increases, it is easy to leave uneven marks on the roller shaft on the paper surface. Therefore, the steel folding roller generally needs a longer setting time, the running speed is slow, the folding quality is poor, and the waste is also serious.
Rubber roller-or polyurethane (PU) folding roller, the grip is better than steel folding roller, but the durability is poor. The working life of all rubber rollers is relatively short. As the folding roller wears out, the grip will become weaker and weaker. In order to control the paper, you need to increase the pressure, and the greater the pressure, the faster the machine wears. As a result, a lot of time and expense will be spent due to equipment updates, failures, and shutdowns.
Hybrid-or called combined folding roller, consisting of steel roller and rubber roller alternately. The width of each section varies depending on the design. Some folding rollers have 30% rubber in the surface area, while others are 40% or 50% rubber.
The combined folding roller combines the advantages of steel roller and rubber roller, and its grip and durability are better. But at the same time it also merges the shortcomings of the two. When the rubber part started to wear, the grip was weakened and the indentation problem also appeared. The renewal and reinstallation of folding rollers are costly and time-consuming.
MBO spiral folding roller-it perfectly combines the advantages of steel folding roller and rubber folding roller, and avoids the disadvantages of combined folding roller. The spiral folding roller is a patented product exclusively designed and produced by MBO. The 70% rubber on the surface provides good grip and is suitable for all types of paper, including extremely thin paper such as Bible paper and smooth coated paper. The steel thread prolongs the service life of the folding roller and avoids the indentation. Greater grip means no need to apply too much pressure, which means less wear, less wrinkles and less static electricity.
The superior grip of the MBO spiral folding roller greatly shortens the determination time, improves the running speed and folding quality, and also minimizes waste—in short, improves production efficiency.
Q: Does the spiral pattern move the paper to both sides?
Answer: No. The spiral direction of the alternating folding roller is reversed, which makes it impossible for the paper to move sideways. In fact, the folding roller rotates straight like a cylinder. When you look at it as if it is moving, it is actually a visual effect caused by a spiral pattern. When the paper passes through the folding unit, you can find a reference object next to it, and carefully observe the position change, you can see that it has not moved.
Q: Can the ink cleaning problem be solved?
Answer: If the ink does not dry when folding, the ink may be stained with any rubber folding roller. This problem exists for all rubber folding rollers and combined folding rollers, and MBO spiral folding rollers are no exception. Some combined folding roller ads may say that it can "self-clean", but when the thickness of the paper passing through separates the folding roller from the gap, the ink is inevitably stained and cannot clean itself Other rollers containing rubber components need to be cleaned of oil.
If you must fold the ink before the ink is dry, you can use a rag and solvent to clean the wall regularly. This procedure is very simple and will only cause a short pause in the production process.
Q: Does the rubber spiral often need to be replaced?
Answer: MBO patented spiral folding roller does not need to replace rubber material. When the wear is severe, the roller can be easily disassembled and polished. The re-grinding of the drum is to grind the outer wall of the drum from beginning to end, so that it becomes the same as the new one. Since the surface of the steel thread is also flat, its grinding will not affect the performance of the rubber part. The rubber material is not a thin layer covering the surface, but is embedded in the drum, and has a certain thickness, which can be re-polished.
Original MBO belt drive system-no need to go to the lower part of the gear system, allowing multiple re-grinding. Calculated according to the normal wear rate, if the grinding is performed once every five years, the folding roller can have the same service life as the entire machine. According to the general mechanical grinding cost, MBO threaded folding roller is not only the best quality, but also the most economical folding roller.
MBO spiral folding roller
70% polyurethane surface, excellent grip, best for smooth paper folding rollers, precise control of thin and light paper, no creases, minimum static interference, patented spiral design, no indentation, less wear, longer service life, minimum maintenance cost
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