MIXING

Twin shaft paddle mixer

The twin-shaft mixer is ideal for mixing products with very different textures, such as pellets, flours, extrudates and flakes. Its design allows for minimum retention times, which prevents the texture of the components from being impaired during the process. In addition, it is particularly suitable for the application of enzymes in pellets, ensuring efficient and gentle mixing to preserve product quality.

The Rosal mixers are designed to be durable and require minimal maintenance.

Render of an industrial twin shaft paddle mixer Rosal

Features

Rosal twin-shaft paddle mixer in the production plant

Design

Wide range of models

Rosal has a wide range of models of double rotor mixers, from 500 to 6000 liters.

The body of the double rotor mixer is cylindrical, adapting to the path of the blades along the entire vertical axis.

The twin-shaft mixer is designed with a bolted, adjustable and interchangeable rotor blades, which allows for great versatility and adaptability in the mixing process.

Models

ModelNominal capacity (liters)Total width (mm)Tank length (mm)Motor power (kW)
MDR-500500146096011
MDR-100010001825120022
MDR-200020002300150030
MDR-300030002620175537
MDR-400040002900190045
MDR-500050003000200055
MDR-600060003350235075

Frequently Asked Questions

What is the typical mixing time in a mixer?

The standard mixing time is approximately 4 minutes, although it may vary depending on the formula and ingredients used.

What material are the mixers made of?

The tanks are manufactured in AISI 316 stainless steel or carbon steel, with thicknesses ranging from 4 to 10 mm depending on the capacity of the equipment. The rotors are made of treated carbon steel for greater durability.

Can liquid be added during mixing?

Yes, the mixers are prepared for the addition of vaporized liquids by means of integrated spray systems, allowing the mixture to be enriched with oils, molasses or other additives.

What is the difference between a double mixer and a single mixer?

Dual-rotor mixers have two shafts with blades rotating in opposite directions, generating a cross flow. Single-rotor mixers have a central shaft with blades in one direction only.

What are the advantages of a double mixer?

The double rotor offers faster mixing with more uniform distribution and shorter processing time per batch. In addition, this configuration minimizes vibration and noise during operation, improving operating conditions and reducing required maintenance.

How are the shafts in a twin rotor mixer synchronized during operation?

The shafts of a double rotor mixer are synchronized by means of a mechanical transmission system that guarantees a coordinated rotation, ensuring homogeneous mixing without interferences between blades.

What certification do our mixers have?

MDR Rosal mixers are certified according to ATEX Directive 94/9/EC, and have the designation: EX II 3D T195°C. This means that they are approved for use in areas classified as zone 22, where dust explosive atmospheres may occasionally occur.

What is the function of the pneumatic vibrator in the double rotor mixer?

The pneumatic vibrator is activated after the complete opening of the tilting gate to promote the product fall. It must be deactivated before closing to avoid mechanical damage.

What maintenance is required?
  • Every 50 h: cleaning and thermal control.

  • Every 1000 h: check oil, leaks and electrical components.

  • Every 2000 h: greasing of bearings and seals.

  • Every 25,000 h: disassembly and replacement of bearings.

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