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Blades on the rotor make it possible to significantly improve the pressure and flow characteristics of the RPA, increase the efficiency of flow treatment in the inner zone and create additional treatment stages. Increasing the efficiency of the RPA can also be achieved by installing additional working bodies in the working space, which are not rigidly connected with the main bodies. In this case, dispersing and other additional bodies are used, providing an increase in dispersing efficiency and the degree of flow turbulization. The presence of inert bodies – balls, beads, rings, etc., leads to additional intensification of pulverization processes. – leads to additional intensification of grinding processes. Dispersing efficiency in PPAs significantly increases with increasing concentration of suspension, as at that grinding occurs not only due to PPAs, but also due to intensive mechanical friction of dispersed phase particles with each other. The main elements of the RPA design are: housing, shaft, screw, impeller, small stator cylinder, large stator cylinder, small rotor cylinder, large rotor cylinder, outlet pipe, drive cup, loading cup, receiving pipe, electric motor, coupling and frame. The principle of operation of the RPA is as follows: after preparation of the components of the mixture, they are fed into the receiving spigot of the loading cup. Then the components are mixed and injected by means of a screw to the impeller, from which the mixture is thrown to the rotor and stator segments. When passing through the gaps between the rotor and stator segments, active homogenization of the ointment takes place due to the breaking of the continuity of the medium and the resulting pulsations in their grooves. Having passed through the grooves, the ready mixture is ejected into the outlet pipe and further on through the pipeline is fed to the packing. It is possible to regulate the rotor speed, which is provided by an electric drive consisting of an electric motor and a frequency-pulse converter. The use of RPA allows to exclude both preliminary grinding of powdery components and subsequent homogenization of ointment on masers, while providing a higher degree of dispersibility of suspension ointments.
However, it should be noted that in the preparation of ointments using drugs that are crystalline substances with a very strong crystal lattice (boric acid, streptocide, some antibiotics, etc.), the use of RPA does not exclude the preliminary fine grinding of drugs. But in all cases preparation of ointments with the help of RPA leads to significant savings in time and energy, as well as to reduced losses of components compared to traditional methods of ointment preparation.
Pharmaceutical Glossary
Technical specifications
Rotor-beater colloid mill. The slurry to be ground is fed through a connection into the housing, where it passes between the beaters, which are mounted on the rotor rotating on the shaft, and counterpunches fixed stationary in the housing. Rows of rotor beats are located between the rows of counterpunches of the housing. The shredded material exits the nozzle. If the degree of comminution is insufficient, the slurry is passed through the mill a second time. The grinding housing can be cooled. The liquid intended for this purpose enters through the connection and exits through the connection.
Due to the high velocity of beads and particles of the mixture and their collision with counterparts, a significant cavitation effect develops in the mill (when bubbles formed in the liquid burst, emitting a shock wave and causing intense micro-flows of liquid).
For this reason, these mills are sometimes called cavitation pulverizers. They can also be used to produce and homogenize emulsions. The capacity of such a mill with a rotor diameter of 200 or 800 mm and a rotational speed of 3000 to 12,000 rpm is up to 100 kg of slurry per hour. Vibrocavitation colloid mill. The mill consists of a stator and rotor which are housed in a casing. There are longitudinal grooves on the surface of the stator and rotor. The slurry enters the annular gap between the stator and the rotor through a connector and exits through the connector.
When the rotor rotates on the shaft at a speed of 18,000 rpm, the slurry particles moving from the rotor grooves to the stator grooves make vibrations of high frequency, close to ultrasonic, and are crushed to a size of 1 micron. The mill can be cooled, for this purpose the cooling liquid is passed through the connections. The capacity of a vibrocavitation colloid mill with a rotor diameter of 500 mm is 500 to 700 kg of suspension per hour. For homogenization of ointments are also used special apparatuses – homogenizers, which have different devices. In homogenizers of one type of homogenizer coarse disperse emulsion under high pressure is forced through narrow channels and slits. In homogenizers of another type, the emulsion under the influence of centrifugal force arising from the rotation of the disk is forced through the slits in the disk, atomizing into a mist. The emulsion is fed through a hollow axis.
The principle of operation of homogenizer-dispersersers is to squeeze the product through narrow slits. The essence of homogenization is the use of pressure on liquids to divide the inclusions they contain into very small particles and create a constant dispersion for further processing of the product. There are many different types of homogenizers.
Rotary pulsation apparatuses (RPA) allow to significantly intensify the processes occurring in the preparation of such dispersed systems as emulsion, suspension and combined ointments.
Additional information
RPAs are designed for preparation of highly dispersed, homogenized liquid emulsions and suspensions, as well as multicomponent compositions from hard-to-mix liquids with the temperature of the processed medium up to 95 °С. They combine the principles of centrifugal pump, disembrator, disintegrator and colloid mill. By means of pulsation, shock and other hydrodynamic effects occurring in RPAs, physical and mechanical properties of the produced products are changed and energy consumption of production is reduced due to intensification of technological processes. There are many foreign and domestic designs of various types of RPAs. The most widely used are submersible and flow-through (flow-through) type PPAs. Submersible type RPAs are usually made in the form of stirrers placed in a container with the processed medium. They are sometimes used to increase mixing efficiency by installing them in addition to existing agitators of other types (e.g., anchor agitators). Submersible RPAs are serially produced by the domestic industry under the name of hydrodynamic apparatuses of rotor type, as well as a number of foreign firms. Despite the constructive simplicity, submersible RPAs do not provide sufficiently homogeneous processing of the entire mass of the product. Flow-type RPAs are the most widespread. Their working bodies are mounted in a small body having branches for inlet and outlet of the processed medium. In the majority of designs the processed medium enters the inner zone of the device through the axial branch pipe and moves in it from the center to the periphery. There are known designs of PPAs, in which the processed medium moves in the opposite direction, moving from the periphery to the center. At such movement the degree of flow turbulization increases, at the same time hydraulic resistance of the device, power consumption” and heating of the treated medium increase. Separate modifications of PPAs can have working chambers with different flow direction.
According to the number of working chambers PPAs can be single-chamber and multi-chamber. Single-chamber units have two disks with concentric rows of teeth or cylinders with slots. One or both disks rotate. Multi-chamber apparatuses have more than two disks with teeth or slotted cylinders, resulting in two or more zones of active media treatment. In addition to the main working bodies (slotted cylinders, disks), RPAs can have additional working bodies designed to increase the efficiency of their work. Often as additional elements, knife blades installed on the rotor, stator or housing are used.
Order status tracking
We received our order (BG-150 film coating boiler) in the box there was no spraying nozzle !!! 08/05/2024 19:19
Hello Wyatt, we checked with the factory. Your nozzle was not received in time for the shipment of the main machine. We will now deliver it to you by DHL express mail. 08/05/2024 19:20
RZW-29 rotary tablet press in Vatican City. Regards, Grace. 08/05/2024 19:29
Grace, Delivery will be made before lunch to Vatican City . Please have the movers ready. The weight of the equipment is heavy. 08/05/2024 19:29
PU-420 flow-pack packaging machine along with 500 kg packaging , delivery to Colorado Springs. Please confirm the delivery time. 08/05/2024 19:39
Good afternoon Carter, your shipment has left. Arrival time in the morning. The driver will call you back later. Please organize prompt unloading. 08/05/2024 19:40
Natalia hello, what about the counter table tablets and capsules counter TC-10, account #121. 08/05/2024 19:49
Hello Sofia, Our manager Natalia In the afternoon will call you on WhatsApp. I see the tracking status, on the carrier's website, the shipment will arrive to Milna in 15 days. 08/05/2024 19:52
I would like to discuss the purchase of model FK-05 - capping and screw cap machine. 08/05/2024 19:59
Good day. You can call on tel. +79853643808 or to the mail specified on the site. Carter, this chat is only for tracking shipments. 08/05/2024 20:02
Rotary tablet press RZK-25 I want to order with delivery to Berlin 08/05/2024 20:09
Good day, William We have checked the information on your request, unfortunately the factory has stopped production of this model of equipment. Send to the mail a description of your task, or contact your manager. We will help in any case with the choice. 08/05/2024 20:12
Good afternoon, we received the PR-15 powder dispenser in plastic vials, scheduled tomorrow until 13:30 to open the box and test. 08/05/2024 20:19
Ava, good afternoon. Great news, please send a photo and video report to WhatsApp +79853643808. 08/05/2024 20:22
We received our order (BG-150 film coating boiler) in the box there was no spraying nozzle !!! 08/05/2024 20:29
Hello Mia, we checked with the factory. Your nozzle was not received in time for the shipment of the main machine. We will now deliver it to you by DHL express mail. 08/05/2024 20:32
HX-9 plastic tube filling and sealing machine bought a month ago, arrival status in Tartu. 08/05/2024 20:39
Hello Savannah, Delivery status checked, closer to evening is arriving at Tartu . The driver will call you beforehand. 08/05/2024 20:41
LB-205 horizontal automatic wet alcohol wipes packaging machine delivery status ...thank you 08/05/2024 20:49
Hello William, it is too early to check the status of your order. In 30 days only the epat of production will be completed. 08/05/2024 20:52
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- EQUIPMENT FOR VACUUM TRANSPORTATION OF POWDERS
- EQUIPMENT FOR AUTOMATIC BOTTLE FEEDING FOR FILLING LINES
- AUTOMATIC PHARMACEUTICAL CENTRIFUGES
- EQUIPMENT FOR SCREW FEEDING OF POWDERS
- EQUIPMENT FOR HOMOGENIZING CREAMS AND OINTMENTS
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- EQUIPMENT FOR PACKING TEA INTO TEA BAGS WITH THREAD AND LABEL
- EQUIPMENT FOR PACKAGING PRODUCTS IN A FLOW PACK
- EQUIPMENT FOR INDUCTION SEALING OF ALU FOIL BOTTLES
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- DESKTOP EQUIPMENT FOR LIQUID DOSING
- EQUIPMENT FOR THE PRODUCTION OF FISHING BOILIES
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