Problast® machines feature a unique closed-circuit system, i.e. immediately after the blast media has been thrown onto the workpiece it is recovered and recycled. This ensures a consistent quality of the abrasive and minimises consumption.

You are free to blast anywhere in open or closed environments, without interfering with other activities nearby with almost no pollution.

Problast® closed-circuit blast machines are ideally suited for the treatment of flat and rotationally symmetric workpieces.

Typical applications are the blasting of rollers (cylinders) and plates (panels) or the cleaning of welds.

Video clips: Blasting of weldings

Pressure-fed or suction-fed blasting?

Problast® closed circuit-machines are available in pressure-fed and suction-fed versions:

Problast® pressure-fed blast machines

In the pressure-fed version blast media stored in the pressure vessel is metered into the air stream and directed with up to supersonic velocity at the workpiece through a specially designed nozzle. Pressure-fed blast machines are mainly used for

  • Rust removal
  • Descaling
  • Paint stripping
  • Roughening
  • Shot Peening

For pressure-fed blasting mainly metallic media and aluminium oxide are used.

Problast 40 DV pressure-fed machine
Problast 80 DVK pressure-fed machine

Continuously operating pressure-fed blast machines (K-version)

Special applications sometimes require uninterrupted blasting operation for several hours*. In the case of pressure blasting this means that no break is available for the refilling of the pressure vessel. This is rather achieved by a transfer vessel which feeds the main pressure vessel. Whereas the abrasive residing in the main vessel always remains under pressure, the transfer vessel is operating in continuous cycling mode: depressurization - refilling from the storage hopper - pressurization - refilling of the main pressure vessel.

*) An optionally available external refilling hopper ensures a constant operating mixture by feeding fresh abrasive into the vacuum hose.

Problast® suction-fed blast machines

In the suction-fed version the blast media is drawn to the nozzle by a venturi generated within a special gun assembly. Suction-fed blast machines are mainly used for

  • Mattening
  • Roughening
  • Cleaning

For suction-fed blasting mainly non-metallic media such as glass beads and aluminium oxide are used.

Problast 40 SL suction-fed machine
Problast 60 SV suction-fed machine

Which kind of blast media?

With closed-circuit blasting systems all kinds of recyclable blast media can be used such as aluminium oxide, glass beads, ceramic beads, steel grit, plastic media etc. One-way abrasives such as slags are not suitable.

Manual or automated blasting?

Manual handling of the blast gun
Automated handling of the blast gun

One-way or multi-way blasting?

Normally, blast media is repeatedly recycled until it is crushed to dust particle size and separated by the air cyclone (multi-way or circuit blasting). With special applications, for instance if an exactly specified surface structure must be obtained, it can be necessary to use the abrasive only once. In this case the abrasive is directly disposed into a drum (one-way blasting).

Closed-circuit machine for both one-way and multi-way blasting

Extensions à la carte

Problast® machines may be equipped with various options including:

Transfer vessel for continuous pressure blasting
Refilling hopper to maintain a constant abrasive operating mixture
Double feed valve with pneumatic metering and clean air purging
Blast media level probe

Flexible use as Powerpack

Blast Cabinet with Problast Powerpack

Problast® closed-circuit machines can also be used as Powerpack in combination with existing blast cabinets and blast rooms.

Moreover, they form the basis of many of our custom-designed solutions.

Problast Powerpack with mulithopper

Problast® Powerpacks also allow for the implementation of cost-effective blastroom solutions.

A row or several rows of hoppers (multihopper) is either flush mounted or mounted on one side of the room together with a small ramp and connected with the Powerpack by a vacuum hose.

At the end of the blasting operation the abrasive/dust mixture remaining on the floor is swept into this row of hoppers from where it passes to a reclaimer cyclone for separation from dust and debris before it is finally deposited in the pressure vessel.

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