Machine plaster is a technique very often used today by specialized companies. It has some advantages, but also brings - at least in some situations - disadvantages compared to the manual plastering with it. You can read here how the machine is plastered, what advantages and disadvantages there are, and which plasters are suitable for it.

Basic procedure

Machine plaster is done using special plastering machines. The finished mixed plaster is sprayed onto the wall via a mortar spattering head and then smoothed out with smooth trowels of 1 to 1.5 meters in length.

cleaning machines

For plastering machines, a distinction is made between two different types: those with piston pumps and those with screw pumps.

Cleaning machines with piston pumps

A pumping piston builds up the discharge pressure in these machines. A balancing piston runs in order to compensate for the pulsation of the material flow. In very old models, a so-called wind boiler is installed, which replaces the balance piston.

The handling of piston pumps is more complicated and requires a lot of experience. They are also much more bulky than screw pumps.

In many companies these pumps have been replaced in recent years by the easier-to-use screw pumps.

With piston pumps, gypsum-based plasters can generally not be processed.

Cleaning machines with screw pumps

In this type of machine, the delivery pressure is built up by a screw conveyor rotating in a rubber casing.

Spiral pumps are universally applicable and much more convenient and easier to use than piston pump systems. But you are also a little more susceptible to wear.

In feed pump machines, the screw pump must be operated with a pre-installed continuous mixer, which mixes the dry mortar with the correct amount of water. For larger hose lengths are possible, the speed and thus the flow rate can be adjusted. This makes sense in many areas.

Other machines mix the dry mortar with the right amount of water directly in the screw via a mixing spiral. Thereafter, the pumpable plaster is transported via the screw conveyor to the mortar injection head.

An adjustment of the flow rate is possible with these machines only on the use of different rubber coats of the screw. The choice of the rubber jacket is determined by the following conditions:

  • the grain (the finer, the harder the rubber coat)
  • Type of plaster (basic plasters require higher capacities than textured plasters)
  • Flow rate in general

machine plasters

Not every plaster can be processed with the plastering machine. Only so-called machine plasters can be processed. They can be bought as ordinary bagged goods, and of course also processed by hand.

A 30 kg sack is on average at around 6 EUR in the hardware store and is enough for about 3 m² with normal order size indoors.

Disadvantages of machine cleaning

A very significant disadvantage is that machine plasters contain up to 5% chemical additives. Natural mineral plasters can not be processed without these additives with plastering machines.

This has a negative impact on the environment and possibly also on the health of the residents, as these substances may eventually fade out later.

In the field of historic preservation is also reluctant to work with machine cleaning, since the adhesion of fine plaster on machine plaster base is not particularly high. Due to the high level of smoothing, even finer structures are lost.

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