The screen is not a passive component. Controls the size of the product, the dwell time and part of the equipment load. Incorrect selection can limit production even with new blades.
Drilling diameter and shape
A smaller hole produces a finer fraction, but increases recirculation. Round perforations are common; There are also special grooves and geometries for flexible or fibrous materials.
Thickness and open area
The thickness must withstand impacts without unnecessarily reducing the pitch. The percentage of open area depends on the diameter, the spacing between holes and the geometry of the basket.
Manufacturing material
For abrasive applications, anti-wear steels such as Hardox or treatable grades can be used. The choice must also consider welding, bending and the possibility of repair.
Signs of wear
- Oval or burred holes.
- Cracks around fixings and welds.
- Deformation or contact with the rotor.
- Capacity reduction without changing the blades.
Information for making a sieve
In addition to the length, width and thickness we need radius of curvature, position of fixings, perforation, margin without holes and direction of assembly.
Consult our screens, grates and wear parts or send a drawing for custom manufacturing.
How the screen influences production
Two screens with the same diameter can offer different results if they change the thickness, the pitch between holes or the percentage of open area. When the material remains in the chamber for too long, it receives more impacts, generates fines and increases its temperature. On the contrary, an excessively fast output can result in irregular granulometry.
The selection must relate capacity, target size, apparent density and behavior of the residue. Film, fiber, rubber, rigid plastic and cable do not pass through a perforation in the same way.
Common mistakes when requesting a screen
- Measure only the external development without indicating the radius.
- Do not identify the working face or the assembly direction.
- Skip reinforcements, hinges, closures or undrilled areas.
- Choose the material only for hardness, without considering welding and bending.
Frequently asked questions
Can a used screen be copied?
Yes, but first it must be checked if it is deformed. Whenever possible, the measurements are compared with the machine and the nominal geometry is reconstructed.
When should you use anti-wear steel?
In very abrasive processes or with repeated impacts, the duration may increase. It is necessary to check that the chosen quality allows the required curves and joints to be manufactured.
Does a minor perforation always improve the product?
No. It reduces the maximum size, but it can reduce the capacity and increase consumption, heat and recirculation. The decision must be made with process data.
To quote a screen, indicate machine, model, thickness, perforation and photographs of fixings. Our team can prepare a manufacturing drawing and retain it for future replacements.