How can I choose the right product?

Bouveur produces the spiral blades of different lengths and diameters. Lengths can vary from 100mm for small sample machines to 6,500 mm for the largest carpet machines on the global market.

Diameters range from 30 mm to 500 mm for the largest cylinders on the global market.

Each of our spiral blades possesses a reference number. This number identifies each blade and is used to trace the time and the manufacturing conditions. It also enables us to manufacture one or more replacement blades with identical specifications of those former orders.

We create a wide range of blades based on customer demands and the characteristics required by machine manufacturers. Length, diameter, thickness, number of file cuts, right and left-handed, pitch length. We offer a wide range of file cuts per centimetre and the selection will generally depend on the material for cutting.

Number of file cuts per centimeter offered: 8 – 9 – 10 – 11 – 12 – 13 – 14 – 15 – 16 – 18 – 20 – 22

The pitch length depends on the materials to be sheared and it must be absolutely constant and identical for all blades on the cylinder when replacement.

The role of file cuts
The shearing function is achieved by the combined action of the spiral blades and the ledger blade (counter-blade), in a similar way to how scissors work. The fibres to be cut will tend to slip due to the oblique shearing angle of spiral blades. The role of the file cuts is to prevent slipping while shearing the fabrics. The file cuts work correctly only if they are regular, at the proper angle and of the right depth.

The spiral blade, from the sectional view, is composed by two parts

• The cutting wing, normally file cut (with teeth).
• The heel which is attached onto the body of the cylinder gives the maximum strength to the blade and enables it to cut the material in the best conditions of efficiency and duration.
• The cutting wing needs to be curved and it should remain constant until the blade has completely worn out.
• The role of the heel is essential as it ensures the stability of the blade on the cylinder.
• If we want to obtain the consistent cutting angel, the shape formed at the heel needs to be changed based on the diameter of the cylinder and the length of the pitch. This is the basic rule which can never be ignored. It also requires that the degree of twist and the winding diameter of blades should be calculated in such way so that the concave inner face of the heel can be attached onto the cylinder well tightly over its whole length. It means that each type of the spiral blade requires a special manufacturing process corresponding to its characteristics.