The food industry, polymers, cement factories and mills need to transport large volumes of bulk food.
The technology of truck transport in dense phase allows the handling of loose materials in powder or granules within a pipeline for distances of over 500 m, including continuous vertical sections of up to 100 meters, with capacities over 100 tons / h.
The dense phase transport preserves the integrity of the material, even in the case of mixtures of several products. The low speed is suitable for very fragile products, such as atomized ceramic, roasted or ground coffee beans, sugar, rice to be treated or white, cereals, dried beans, milk powder, extruded products and glass fiber.
The wear of the pipes using truck transport in the dense phase is considerably lower than in other systems.
Speed values ​​are listed as follows:
• Dense phase – about 5 m / sec.
• Other systems – about 30 m / sec.

Dense phase pneumatic conveying differs from other technologies for its low speed and high product / air efficiency ratio. The indicative ratio between air (or other gaseous fluids) and product is as follows:
• Dense phase about 30-60 kg of product per 1 Nm³ of carrier gas.
• Other systems about 6-10 kg of product per 1 Nm³ of carrier gas

The high efficiency ratio allows pipes to be used at a significantly reduced section compared to other systems.
The low amount of gas used does not disperse volatile substances and preserves the fragrance; the use of inert gas avoids oxidation of the products.
The greater flexibility of dense phase conveying, compared to both dilute phase systems and conveyor belts and traditional methods of industrial automation, allows the combination with any type of machines: extractors, silos, auger machines, hoppers, machines for emptying bags, bag cutters, electro filters and filters.

Thanks to the densification of the product during transport, the noise level drops below 75 dBA.
The use of reduced air volumes allows for significant energy savings. The maintenance costs of dense phase pneumatic conveying systems are contained; the number of spare parts and technical interventions is reduced.

SMC Group solutions are suitable for longer and shorter paths. The use of boosters to control compressed air or other inert gas makes it possible to transport powders and granules over large distances.

Microwaves are a form of electromagnetic energy with frequencies between 300 MHz and 300 GHz, generated by the magnetron under the joint force of magnetic and electric fields perpendicular to each other. In the electromagnetic spectrum they are identified between radio waves and optical waves. The most common frequency used for industrial purposes is 2450 MHz, due to the advantages offered by this frequency. Microwave fields are reflected by metals, which do not heat up. For this reason, metals are used as conduits for microwaves, or wave guides and as walls for the microwave oven.

Since industrial equipment is made of stainless steel, the chamber acts as insulation for microwaves by reflecting them. Microwaves penetrate materials and release their energy in the form of heat as polar molecules (those with positive and negative ends – such as water) vibrate at a high frequency to align with the frequency of the microwave field (2.45 GHz).

This vibration generates heat. Many studies have now been published showing no difference in the stability and physicochemical properties of materials dried with microwave processing, when compared to other drying methods. Since microwaves are non-ionizing and do not have an amount of energy necessary for the formation of free radicals, there are no conditions created during microwave drying that generate product instability.

This characteristic can greatly accelerate the drying of the material, which is why our dryers are so efficient and advantageous in terms of low energy consumption.

The rotary kiln is a technology of drying, incineration or heat treatment of the material that has ancient origins, but is still used today in various sectors. The rotary kiln is composed of a cylinder that rolls on rollers driven by one or more gearmotors.
The motorization can be applied directly on the rollers or by means of racks placed on the cylinder body. Inside the kiln there are spirals or vanes that help the movement, lifting and spreading of the material inside the cylinder while rolling.

The materials used are many, from simple carbon steel, to stainless steel, special alloys resistant to temperature and corrosion and finally coating in non-stick or refractory material.

The heat can be transferred to the material with an energy flow in equi current or against current, depending on the direction. Hence here we can have a direct heat transmission through direct flame from the burner directly inside the oven or indirectly through air heat generated externally.

This technology is often used in difficult materials such as waste or especially in incineration, but the thermal performance of the system is not optimal, certainly for certain types of process it is preferable to use our other type of dryer, perhaps combining microwaves to increase even more thermal outputs.