Sand blasting principle

Types of sandblasters?

All sandblasters work on roughly the same principles: finely ground silica sand or glass beads are used to clean and abrade a surface, typically metal, of any rust, paint or other unwanted surface materials. This is done by means of an air-powered pressure gun that fires out the sand or glass beads at high velocity to impact with the intended surface. All sandblasters use said pressurized gun, which has a ceramic barrel or interior coating to prevent the sand from eroding it over time. The exact process by which the sand is introduced to the gun differs.


Trad4u supplies 2 types of sand blasting methods:


1. Pressure blasters

Pressure sandblasters are energy efficient and can be used with a smaller compressor. They consist of a large canister containing silica sand under high pressure. This is a bit similar to the concept behind an aerosol can. A sandblasting gun, or sandblasting valve gun, is connected to the port at the bottom of the canister by means of a specialized hose that can withstand the abrading affects of the sand. When the trigger of the gun is pulled or the blasting valve is opened, both the air and sand are forced out as a single entity. Because the canisters are are used in open air, the sand that they fire is hard to collect for re-use.


2. Siphon sandblaster cabinets 

Sand blasting cabinets are the models you're most likely to find in any handyman's possession. The sand blasting cabinet consists of three parts. It has a sandblasting gun with two separate hoses, one connected to the bottom of the handle and the other connected the underside of the barrel. To operate comfortably a large compressor is needed. Inside the cabinet there is a reservoir of loose sand. This takes the form of a funnel at the bottom of the cabiner. The air hose of the gun is connected to the compressor, while the other hose is connected to the underside of the cabinet. When the gun is fired, the air serves to create a suction, which pulls the sand from the cabinet funnel up the hose and into the gun to be fired out the barrel. As a result of this system, the sand that is fired out the barrel gets collected at the bottom of the cabinet to be reused again and again.