Customized screen solutions for your mill
High performance grinding screens
Updated on By Moinhos Vieira – technical team
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.
Technical drawing
Screens for mills - model
Vieira mill: the factory already knows the measurements, just tell us the model, the hole size and the quantity. Another brand: enter the dimensions shown in the drawing and get a quote for your screen.
Check the dimensions on the drawing
Vieira mill: the factory already knows the screen measurements. Choose the model and enter only the hole size (dimension G, the hole diameter) and the quantity. Mill from another brand: use the drawing below to enter dimensions A to G of your screen.
Dimensions on the drawing
- A Length
- B Width
- C Length edge
- D Width edge
- E Arc measurement
- F Thickness
- G Hole size (hole diameter)
Vieira mill: the factory already knows the measurements; just enter the hole size (G) and the quantity. Dimensions A to F are for mills from other brands.
Vieira mill: enter the hole size (dimension G) and the quantity; the factory already knows the other measurements. Another brand or model: enter dimensions A to G from the drawing. If you don't have all of them, send what you have: our team will confirm them with you.
Request received
We have received your request. Our team will contact you shortly. If you provided an email address, we will send you a confirmation with your request code.
Request code MV-····
What happens next
- A Moinhos Vieira specialist reviews your request.
- We reply during business hours: Mon–Thu, 8am–5pm · Fri, 8am–4pm (Brazil time).
- Want to speed things up? Message us on WhatsApp with the code.
Prefer to talk?
Vieira mill: tell us the model, the hole size and the quantity. Another brand: also fill in the drawing dimensions in the message and send it on WhatsApp.
Send measurements on WhatsApp+55 (15) 3251-0810Mon–Thu, 8am–5pm · Fri, 8am–4pm (Brazil time)
In hammer mills, during grinding, the particle size variation of the processed products is determined by the diameter of the hole in the screen or perforated plate.
Conical screens for mills
Ø 0.3 to 1.9 mmhole diameter
Moinhos Vieira specializes in the manufacture of perforated plates or conical hole screens. These screens are designed with holes starting at 0.3 mm and are produced in plates with thicknesses greater than the diameter of the holes, which allows for greater durability against wear and abrasion during grinding.
Explanatory video: Conical screens for mills
Advantages of conical screens
8 to 15%
Higher flow rate in the grinding stream
In conical screens, the determining factor for increasing the flow rate in the grinding stream is related to the “Venturi” effect, thus increasing production by 8% to 15% more per hour!
10 to 20%
Better granulometry
10% to 20% more fines in the granulometry
2.5 to 4×
More durability
2.5 to 4 times more durable than conventional screens on the market
Parallel screens for mills
Ø 2.0 to 14.0 mmhole diameter
Moinhos Vieira specializes in the manufacture of perforated plates or parallel hole screens. These screens are designed with holes starting at 2.0 mm and are produced in plates with thicknesses greater than the diameter of the holes, which allows for greater durability against wear and abrasion during grinding
Explanatory video: Parallel screens for mills
Advantages of parallel screens
Up to 50% open area flow
Parallel Screens are manufactured hole by hole, and adjusting the distance between holes allows for a considerable gain in open area, where we can achieve up to 50%!
Increased durability
Due to the heat treatment that the perforated plate undergoes, we increase the wear resistance of the surface layer and improve the fatigue resistance of the screen.
Reduction of energy costs
As your production will increase due to the greater open area flow, you will produce more with the same installed power and due to the greater durability, you will achieve less set-up when changing screens, resulting in a considerable reduction in the number of starts on your mill’s electric motor.
Granulometric standards
The Mesh Conversion Table is a useful reference in hammer mill grinding, used to determine the size of the particles resulting from the process. It relates the Mesh number (a particle size measurement system) to the diameter of the mill’s screen openings. The higher the Mesh number, the smaller the size of the particles produced. This table helps with the choice of screen and the precise configuration of the mill to achieve the desired particle size in the final product, and is essential for industries that require particle size control, such as in the production of animal feed, flour, and other grinding applications.
| Tyler mesh | U.S. mesh | mm | inches |
|---|---|---|---|
| 4 | 4 | 4.75 | 0.187 |
| 6 | 6 | 3.35 | 0.132 |
| 8 | 8 | 2.36 | 0.094 |
| 10 | 12 | 1.70 | 0.066 |
| 12 | 14 | 1.40 | 0.056 |
| 14 | 16 | 1.18 | 0.047 |
| 16 | 18 | 1.00 | 0.039 |
| 20 | 20 | 0.85 | 0.033 |
| 24 | 25 | 0.71 | 0.028 |
| 28 | 30 | 0.60 | 0.023 |
| 32 | 35 | 0.50 | 0.020 |
| 35 | 40 | 0.425 | 0.017 |
| 42 | 45 | 0.355 | 0.014 |
| 48 | 50 | 0.300 | 0.012 |
| 60 | 60 | 0.250 | 0.0098 |
| 65 | 70 | 0.212 | 0.0083 |
| 80 | 80 | 0.180 | 0.0070 |
| 100 | 100 | 0.150 | 0.0059 |
| 115 | 120 | 0.125 | 0.0049 |
| 150 | 140 | 0.106 | 0.0041 |
| 170 | 170 | 0.090 | 0.0035 |
| 200 | 200 | 0.075 | 0.0029 |
| 250 | 230 | 0.063 | 0.0025 |
| 270 | 270 | 0.053 | 0.0021 |
| 325 | 325 | 0.045 | 0.0017 |
| 400 | 400 | 0.038 | 0.0015 |
| — | 500 | 0.025 | 0.0010 |
Industries served
Food industry
Our mill screens are used to grind grains, seeds, spices and so on. These grinding screens are essential for ensuring that food products are uniform and of high quality.
Pet Food industry
Our mill screens are used to grind feed ingredients such as grains and pre-mix formulations. The grinding screens we manufacture help to ensure that pet food is nutritionally balanced and tasty in Latin America’s leading pet food industries!
Cosmetics industry
Our mill screens are used to grind various chemical products within the cosmetics industry. The grinding screens manufactured by us help to ensure that the main cosmetics industries have safe granulometric standards in their processes.
Pharmaceutical industry
Our mill screens are used to grind ingredients for medicines, such as plants, herbs and chemicals. They help ensure that medicines are safe and effective. We serve these industries by manufacturing the screens / perforated plates in 316L steel.
Other applications
Our mill screens are used to grind the most diverse products. As we are manufacturers of perforated plates, we can meet your needs, whether in 1020 Carbon Steel or 304/316L Stainless Steel. Contact our team and ask for more information!
More about our screens
Read the full text
Moinhos Vieira is a leading manufacturer of high-quality, high-performance grinding screens. Our mill screens are used by industries throughout Latin America, guaranteeing our customers the highest quality of the final products they grind.
We are committed to customer satisfaction and offer customized solutions, from the manufacture of the screens to the rapid delivery of orders, meeting the specific needs of each industry.
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.
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.
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. 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.
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.
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.