News & Knowhow

Sanitary paper rolls that do not pass the quality control are destined to become waste. This is also true for rolls with slanted cuts also known as bias. These cuts are in part due to paper cutting knives / log saws which are insufficiently sharp, un...

The dark edge on the tissue rolls lateral surfaces is formed by grinding dust that is stuck to the side of the log saw blade and are transferred to the tissue roll during the cutting process. Dirty rolls are unmarketable. But losses originating this ...

There are different reasons why it can be difficult or impossible to regrind the blade to a proper sharpness: The grinding wheels are loaded up ( see next page) => dressing of the wheels on a regular basis The blade has a double bevel due to wrong...

Glue on the blade is a quite common problem for most customers. Most of the time we talk about the transfer glue and/or the tail seal glue. Attention: The tail seal glue is a lot of times transparent and difficult to see! Glue has various disadvantag...

Due to the tapered geometry of the log saw blade, it becomes thicker as the diameter decreases. As a rule of thumb, the thickness of the 610 mm blade increase by 0,1mm per 10 mm of diameter. The increasing thickness is one of the main problems regard...

The core material is in most cases made of recycled low-quality carton board. This includes the possibility, that the carton board contains sand and/or glass and/or metal particles. The cutting edge of the blade might chip if it hits such hard partic...

The temperature at the grinding point exceeds 1500°C and there is no cooling liquid. If the grinding pressure increases, the grinding grains enter deeper into the steel which increases consequently the temperature stress to the blade. This can cause ...

Uneven cutting bevel lengths may create a bias cut on the tissue paper roll, especially on high density products. Check the angles of the grinding wheel set up. Both grinding assemblies should be set at angles of 7°- 7,5° (total bevel 14° - 15°) On r...

The cause for scalloped blades is an irregular grinding process over the circumference of the blade. The irregular grinding process can be caused by: Too high and/or unbalanced grinding pressure of the front and back stones (1) Too high dynamic run-o...

When log saw blades are ground it naturally produces sparks, this cannot be prevented. But there are measures that can be taken to eliminate the risk of fire associated with the log saw. It’s a fact: The tool steel blade used to cut tissue logs has t...