Blast rooms are used in the first stage of powder coating (pre-treatment). A blast room is an enclosed space where the painter uses compressed air to circulate an abrasive material against the surface to be painted. Depending on the roughness of the surface, a suitable blast material is used to eliminate the unwanted debris off the object.
Blast rooms are appropriate for workshops that operate with raw materials that are not pure such as tube stock or plate steel that have welding residue or have some areas of oxidation. Blast rooms make the surface that was rough and rusted to look as good as one which is pristine.
A surface that is covered in scaling, old paint, or rust will not hold the paint for long even after curing. The powder will fall off after a short while and demand costly reworks. Blast rooms help people avoid the troubles and costs associated with reworks. Blast room solutions cost much lesser compared to the cost of rework.
Not only does blasting cost less but also provides the best output for your clients. It removes all the debris from the surface thus providing a clean surface which facilitates powder coating adhesion. Blast rooms are equipment that existing coaters should consider installing when expanding their system. New coaters should also consider installing one from the word go.
There are two types of blasting systems, wet (slurry) blasting system and dry blasting system. A slurry blasting room is quite uncommon. There are several types of dry blasting systems. Despite the type of dry blasting system you want, you have to put several factors into consideration before installing.
Design of the blasting enclosure: Before purchasing a blast room, take some time and study the features of several blast systems. Most of the blast rooms in the market feature a square-shape roof instead of the hip-style roofs. A square roof facilitates smooth movement of operators, has superior lighting, and the loading process is easy. Blast rooms with a hip-style roof are cheap, but they may not meet your needs.
The other thing to look for in the design is the thickness of the walls. Blast rooms with thicker walls are more expensive and durable. Nevertheless, you do not need extremely thick walls as the high-abrasion areas are protected with a rubberized shielding. Ensure the blast room has safety glass and several fluorescent light fixtures.
Size of the room: Most of the considerations for size are similar to that of the powder coating oven. Ensure you choose a blast room that leaves enough room for operator and parts. For instance, if the parts that need to be blasted are long, consider increasing the height of the cabin to avoid blasting the light fixtures and ceiling surface. Also, if the part to be blasted takes up much of the space, leave more space for the operator to work on the object.
Capacity and portability of blast pot: Most of the blast pots can handle 4 to 7 cubic feet of the blast media for every loading. Pots with high capacity are expensive, but they reduce the downtime for reloading.
Cheap pots either come with attachment points for fixing them permanently in the blast rooms or are mounted to a skid. Portable pots are more expensive than fixed pots. They have wheels attached to the base of the pot.
Some blast rooms have a media reclamation system which allows the user to reclaim and reuse the blast media. Others have a dust abatement which eliminates dust from the room when the operation is ongoing. The dust abatement has filters and funs which remove airborne particles from the cabin. It does not remove the blast media from the cabin.