Three rolls are used: the “back pressure roll” (left), the “Chopcot®” (blade roll, right) and the “stress roll” (top).
A concentrated high bending moment is applied to all the filaments by penetrating the blades into wide slots in the outer surface of the back pressure roll. The strands are kept in place at one side of the blades by the elastic push back ribs of the Chopcot® (red parts of the right side roll) and at the other side of the blades by the stress roll that press them against the back pressure roll. The strands break by this over the blade edges.
The back pressure roll is a hardened metal roll, and does not wear out. The Chopcot® and the backpressure roll are interlocked by gear wheels, to keep spacing between the blades and the slot sides of the backpressure roll. The blades only touch the product. This restricts the mechanical forces on the blades and allows the application of hard metal. It is not possible to adjust the position of the axis of any roll, resulting in constant product quality.
The main achievement of the Chopcot® Technology is, that the easy mounted Chopcot® and the stress roll gummy are the only parts subject to maintenance, and these parts have a very long life compared to rolls in conventional machines. Look at the pictures at Products / Chopcot®T5 that demonstrate the easy change out of a Chopcot®. Normally, but dependant on the type of glass, the life of a Chopcot® is between 10.000kg and 20.000kg of chopped glass.
The technology is protected by patents.