# High performance grinding screens URL: https://moinhosvieira.com.br/en/screens-for-mills/ Updated on: 2026-11-04 Other languages: Español: https://moinhosvieira.com.br/es/zarandas-cribas-para-molinos-de-martillos/ · Português: https://moinhosvieira.com.br/peneiras-para-moinhos/ > Moinhos Vieira manufactures screens for hammer mills with conical holes from 0.3 to 1.9 mm and parallel holes from 2.0 to 14.0 mm, in 1020 carbon steel and 304/316L stainless steel. In hammer mills, the particle size of the ground product is determined by the diameter of the screen hole. Perforation: - Conical screens for mills: 0.3 – 1.9 mm - Parallel screens for mills: 2 – 14 mm Materials: 1020 carbon steel, 304 stainless steel, 316L stainless steel ### How the conical mill screen works The drawing below illustrates a 3D cross-section of what we call screens, or perforated plates. In hammer mill grinding, the granulometric variation of the processed products is determined by the diameter of the conical hole in the screen. Perforated plates with conical holes or conical screens for mills have been developed to give greater resistance, thus allowing them to be produced in plates with thicknesses greater than the diameter of the holes. (imagem: High-performance grinding screens) (imagem: High-performance grinding screens) Today, our hammer mills can be used to obtain extremely fine grain sizes, using conical screens starting at 0.3 mm, where the final processed product can reach 90 to 100 MESH (up to 120 MESH on the MCS 280 and MCS 350). Everything will depend on the product to be processed and its physical characteristics. With the right technical knowledge, our team can help you find the best result for grinding your product. Contact us! ## We manufacture screens for mills We specialize in the manufacture of perforated grinding plates, also known as mill screens. Check out the holes we drill below: - **Conical grinding screens**: Ø 0.3 mm to Ø 1.9 mm hole diameter - **Parallel grinding screens**: Ø 2.0 mm to Ø 14.0 mm hole diameter ## CNC punching machines **We are the only Brazilian mill manufacturer that produces mill screens** Mill screens are perforated plates that, when coupled to a grinding rotor, make it possible to obtain granulometric patterns, helping to micronize and homogenize the desired product. It is one of the most important spare parts for those who work with hammer mills, as hammer mill grinding is widely used in the human food or animal feed industry because it is very cost-effective, as well as being easy to handle and install. The mills manufactured by Vieira´s use conical and parallel perforation screens throughout their range of equipment. Depending on the application, these perforated plates can be made from 1020 carbon steel, stainless steel (304 and 316L) and even undergo various heat treatments for greater durability against abrasive wear, thus enabling the screen to have a longer service life. Moinhos Vieira has its own conical and parallel perforation technology, because we believe that this way we will maintain the standard for our customers, always bringing the best cost-benefit ratio to the grinding industry. ## Frequently asked questions ### How is the screen installed in the mill? In Vieira MCS and MCD Series mills, the screen works in 360°, fitted into the guide at the bottom of the grinding chamber. In the MCD Series, the screen of the second, larger chamber sets the final particle size. See the [screen installation guide](https://moinhosvieira.com.br/en/installation-of-screens-in-grinding-boxes/). ### The particle size of the ground product has changed. What could it be? The most common cause is the sealing rubber of the screen guide, which must be replaced. See the [guide to replacing this rubber](https://moinhosvieira.com.br/en/replacement-of-screen-guide-sealing-rubbers/). Also check that the screen is not damaged. ### When should the screen be replaced? When it is worn, punctured or clogged. A screen in this condition reduces output and can choke the mill. More causes in the [troubleshooting guide](https://moinhosvieira.com.br/en/hammer-mill-troubleshooting/). ### Does the screen hole size affect the choice of motor? Yes. The MCS 280, MCS 350 and MCD series models take two motor sizes. For fine grinding, with screens below 1.2 mm, the smaller motor is enough, because the limit is the grinding chamber, not the power. Above 1.5 mm, the larger motor is recommended. See the options on [our mills](https://moinhosvieira.com.br/en/our-mills/). ### Does the screen change the motor's current draw? Yes. The working current of the motor depends on the screen hole size and on the product: moisture, oil content and hardness.