CoreCutter cuts cores from the inside out

Jun 19, 2007

CoreCutterWinders are the last pieces of process equipment before roll wrapping or sheeting, and their job is to cut large machine rolls down to a more manageable size, or into so-called customer rolls.

Efficient modern printing presses require increasingly high quality rolls of paper, which also places exacting demands on the winding process. Even though winding cannot actually improve the quality of the paper, inappropriate operation and control settings can still spoil the paper rolls. Successful winding is, therefore, very important for the quality of the end product.

Winders are also often critical pieces of equipment in terms of mill capacity. However, winding efficiency can be increased by adjusting the manner in which the winders are operated. One way to increase winding capacity, depending on the winder type, may be to wind two or more customer rolls on the same core. This approach facilitates higher running speeds, particularly in the case of narrow rolls, without destabilizing the winding process. The winding of rolls on a shared core may also reduce possible bouncing problems. Customer rolls still need to be separated after the winding process, and the connecting core has to be cut. Valmet’s CoreCutter cutting saw was developed specifically for this purpose.

The CoreCutter cutting saw, CC1000 and CC1800, operates inside the core, which is a very easy and quick way to separate the paper rolls. The saw is pneumatically operated, and its cutting width can be precisely adjusted from 150 mm to 1,800 mm. The saw is designed for 76 mm cores, but larger cores can also be cut with the help of special adapters. The cutting depth can be adjusted up to 18 mm, depending on the thickness of the core wall.

The lightweight construction of the core cutting saw makes it easy to use, and the cut produced is very neat and smooth. Separate safety and operating valves help to ensure that the saw is safe to operate and handle.