Casting or Coating – That´s the question!
With our decades of experience in this area, we have developed into the leading manufacturer of Casting Machines to coat Rollers with a layer of Polyurethane or Epoxy Resins, which are then used, for example, in Paper Machines.
Depending on the size of the rollers (lengths of more than 10 meters and diameters of more than 1 meter are possible), these Machines are equipped with tank sizes of up to 2,000 liters.
Additionally they can also be moved along the roller on a rail system. Depending on the roller diameter and the coating thickness, the mixing head is automatically positioned in the optimal pouring position above the roller via additional movable linear axes.
High-precision Gear Pumps with Volumetric or Massflow Control System, special designs of the Mixing Heads with Slit Nozzles and high casting pressures of well over 60 bar place additional demands on the design, technology and quality of such Casting Machines.
The use of high-quality components ensures that the high-quality requirements on the finished product can be therefor met. In addition to Paper Rollers, this Rotational Coating Technology is also used to manufacture Paint-Rollers or highly wear-resistant Conveyor Rollers for the Steel Industry.
Unlike the Rotational-Coating process, the Rotational Casting process relies on the centrifugal force within the spinning mold (Centrifuge or Spinner). With such Centrifuges and the associated Dosing Machine, wear-resistant mats/plates of over 3 m in length and widths of up to 1 m and more are produced.
When using such Centrifuges/Slingers, of course, all the requirements for technology, safety and occupational safety according to CE must be taken into account and complied with.
This principle is also used for the inner Coating of Pipes, where the Polyurethane is poured into a rotating pipe by using a casting hose or lance. If the diameter of the pipe allows, even the complete Mixing Head of the Casting Machine can be moved on a guide rail through the pipe.
In these applications, the centrifugal force achieves a high compression of the material and thus a bubble-free finished product.
