the restorers and curators wanted. “In addition, great
care had to be taken in regard to the chemicals used as well as
the amounts of water due to the acid-sensitive marble content in
the artificial stone flooring. The increased humidity and fumes
of cleaning agents affect the ceiling and walls just as much as
the snow-white marble artworks. It also stands to reason that the
sculptures are very heavy and thus had to remain in the hall during
cleaning. They were only set to the side.” The solution for these
was provided by the cleaning experts from Kärcher.
One-disc machines with diamond abrasive pads eliminated
need for any chemicals during the treatment process and kept the
amount of water used to a minimum.
Removal of coarse dirt and protective film
The first step was removing coarse dirt and protective films using
a 60-liter scrubber with a roller scrubbing head. This ensured that
as little moisture as possible would develop in the room. Hard
green roller pads were used for this. The high contact pressure of
260 grams per square centimeter ensured the best possible form
fit with the nearly smooth floor. Film residues and dirt were easily
removed and the seams cleaned down to their deepest point. The
maximum speed of the roller pads, 1,000 revolutions per minute,
made sure that the loose dirt did not remain in the pads. The high
speed creates a self-cleaning effect by ejecting dirt from the roller.
Consistent and effective work is the result. The area was handled
twice with a relatively low-dosed five percent detergent solution
to completely eliminate all residues from past decades.
The edges of the hall were cleaned with the slow-running BDS
43/180 C one-disc machine. This device is powered from the grid
and equipped with an additional ten-kilogram weight to increase
its surface pressure. Spots with particularly stubborn residues
had to be manually cleaned by scratching them off with a blade.
The use of one-disc machines with diamond abrasive pads eliminated
the need for chemicals during treatment and reduced the needed water
to a minimum.
Sanding with three different machines
The next step, sanding, was done with three different models, the
B 60 W BP Dose and B 80 W BP Dose walk-behind scrubbers, all
equipped with a disc scrubbing head, and the B 95 RS stand-up
scrubber, also with a disc scrubbing head. To make rapid progress,
The artificial stone was first sanded with coarse-grain white diamond
pads in overlapping passes. Subsequently, the white pads were replaced
with medium-grain yellow diamond pads. Finally, the floors were polished
with green diamond pads.
Particular care was needed in regard to chemicals and amounts of water
due to the acid-sensitive marble content of the artificial stone flooring.
The increased humidity and fumes caused by the cleaning agents also
affect the ceiling, the walls and the marble artworks. Photos: Kärcher
GLOBAL CLEANING | ISSUE 2017 21