Vacuum conveying is the method of moving bulk dry materials such as fine powders from one part of a factory to another, in a quick and hygienic manner. The process is widely used in food, pharmaceutical, chemical and industrial environments.
The powders are transported through a network of tubes in a suction air stream under vacuum. The vacuum is created via a vacuum pump which sucks air through the pipes. Once the vacuum pump is activated, the powder is introduced through a feeding point and travels within the pressurised tubes to a specially designed separation tank at the other end.
Benefits of Vacuum Conveying
Installing a vacuum conveyor within a production plant is an efficient, hygienic and cost effective way of moving materials. In vacuum conveying there are no moving parts that can come into contact with the material, no dust can escape and no contamination can enter the system. It requires a minimal number of staff to move the product, while the operation of the system is very straightforward.
Vacuum conveyors can be automated, providing an efficient system to transport high volumes of dry powder. They are also easy to take apart and clean, requiring no tools. A vacuum conveying system also takes up little or no floor space within a factory. Most systems are delivered pre-assembled and shipped for easy installation at the facility. The system can also be attached to suspension frames to support tubing from above or below. For more information on vacuum conveying visit http://www.aptech.uk.com/pneumatic-conveying/vacuum-conveying/.
Two Methods of Vacuum Conveying
There are two ways to transport bulk dry powders in a vacuum, dilute phase vacuum conveying and dense phase vacuum conveying.
Dilute Phase Vacuum Conveying
This type of vacuum conveyor is best used in food production and for moving products like sugar and flour. The material is introduced to the system in almost equal part to the air pressure. The product is fully suspended in the system and is transported under low pressure at a high velocity.
Dense Phase Vaccum Conveying
Dense phase vacuum conveying is ideal for the gentle transportation of fragile or abrasive materials over short distances. The material is usually transported in slugs within the conveying tubing. The powder is moved at a low rate, travelling slower through the system than the dilute phase.