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Stripping (left) floors using the two-step method with a walk-behind scrubber featuring a roller brush. Step 1: Apply the cleaning agent and scrub the floor. Step 2: Capture the dirty water with the vacuum drier. The picture on the right shows a maintenance cleaning pass with a ride-on vacuum sweeper. Photos: Kärcher Green roller brushes for use on smooth surfaces. Green discs are effective against stubborn dirt. Maintenance cleaning ... 33If the floor is untreated and has a rough surface that tends to Red scrubbing brushes or pads (standardized for all floors) are retain dirt, the stripping procedure must be carried out with a used for the removal of minor contaminations with the one-step roller scrubber. method. Here, the scrubber’s contact pressure setting is set for low This applies, for instance, to textured surfaces, surfaces with added to medium. To remove oil, grease, soot, or mineral contaminations silica sand, or structural coatings. Here, only counter-rotating brush- easily, an alkaline cleaning agent is used at a dosage of 0.5 to 3 es will be effective. The combination of counter-rotating brushes or percent, depending on dirt ingress. Wiping or rinsing is not nec- pads, high contact pressure (up to 260 g/cm²) across the entire essary and the floor is accessible immediately after the procedure. working surface of the scrubbing head, high rotation speeds (up to To avoid the formation of streaks during vacuuming, the vacuum 1,100 rpm), and excellent floor contact is what effectively extracts arm must be parallel to the surface. dirt from all the nooks and crannies for easy and efficient vacuum- ing. Preparatory sweeping is often unnecessary, as the machine is ... with a twist equipped with a sweeping apparatus to absorb coarse dust and dirt Removing skid and tire marks, which frequently occur in curves particles. Depending on the extent of contamination, fewer roller or in front of loading ramps or high racks, is a particular chal- brushes can be used to limit wear. The following parameters must lenge. This task is tackled with a special tire and abrasion mark be set or selected on the cleaning machine, depending on the sur- removal agent (pH 13), which is applied undiluted to the stained face material, structure, and sensitivity to moisture: areas using a spray bottle or an RM spray can. After the reaction 33Water quantity time necessary for the cleaning agent, the scrubber comes into 33Cleaner quantity play using clear water and green disc or roller pads. Caution: Do 33Brush or pad hardness not use this method on coated industrial floors, as the coating 33Contact pressure will peel off. 33Rotation speed There is no doubt that industrial floor cleaning is a complex mat- Roller or disc: It depends on the scrubber head ter. Many aspects must be taken into consideration to achieve the Whether the scrubber is used with a disc or a roller is primarily a desired result. This applies to every branch of the industry and to function of floor texture. companies of all sizes and specializations. N 33 Niels W. Buhrke, freelance journalist | Gerd Heidrich, KärcherSmooth surfaces can usually be maintained easily and safely with disc brush systems. Training Specialist | peter.hartmann@holzmann-medien.de GLOBAL CLEANING | ISSUE 2016 55


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