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:
1. Steel
Steel folding rollers are durable and inexpensive, but they 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.
2. Rubber roller
Rubber rollers, or polyurethane (PU) folding rollers, have better grip than steel folding rollers, but have poor durability. 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.
3. Hybrid
It is also called combined folding roller, which is composed 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.
4. MBO spiral folding roller
It perfectly combines the advantages of steel folding rollers and rubber folding rollers, and avoids the disadvantages of combined folding rollers. 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.
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