SHOTBLASTERS Shotblasting machines are available in walk-behind, single phase 110 volt, 3 phase 415 volt and ride-on versions. The model number relates to the operating width of the machine. Shot ‘steel abrasive’ is propelled at high velocity onto the background surface with the size of shot selected and speed at which the machine is set dictating the level of cleaning and profiling achievable. A larger blast pattern and power input realises greater production rates and infinitely variable degrees of surface profiling to suit the project requirements.
Shotblasting is one of the most cost-effective preparation methods when correctly specified, for cleaning and keying power floated concrete, for removing concrete laitance and surface contaminants and coatings from concrete, steel, asphalt, stone and tiles.
RISE OF THE MACHINES
How do you select the right equipment for your project?
The Preparation Group discusses.
When embarking on any surface preparation project it is necessary to first consider what is to be removed and what is to be applied.
For removal, typical problems that are regularly encountered are uneven joints, high spots, surface contaminants, worn out coatings, sticky residues, old tiles, vinyl and carpets and friable substrates, all of which need to be addressed to produce a level, clean surface.
The specification of the new material or finish to be applied, whether it is a screed, resin decorative finish, self leveller, coating, laminate, wood, ceramic tile, stone, rubber, vinyl or carpet, will dictate the nature and degree of preparation and the surface profiling required to ensure both adhesion and the aesthetic expectations. This will ultimately determine the methods of preparation and the machines, tools and their accessories matched to suit.
There are four key types of preparation and surface removal, shotblasting, planing, grinding and multi-stripping, the type, size and power of the machine and the accessories selected determining production rates achievable. It is important to note that surface preparation machines are designed to work with a filtration unit or industrial vacuum to minimise dust contamination, for a safe, clean operation.
32 | MACHINES, TOOLS & ACCESSORIES
PLANERS Planers are available as single phase 110 volt, 3 phase 415 volt, petrol or diesel walk-behind models and ride-on versions for large-scale projects and heavy-duty applications. Planing is used to remove screeds, self levellers and thick coatings, reduce levels and provide anti-slip profiling. Planers are fitted with a drum onto which flails are attached which rotates within the body of the machine to cut and profile the background surface. The process produces a profiled finish that varies subject to the flail selected and size of machine.
GRINDERS Grinding machines include electric single-head, double-head or multi-head models, diesel and petrol-powered and variable- speed models for wet grinding and polishing applications. Grinding would be selected when a flat, level and smooth profile is required, for removal of concrete laitence, surface contaminants, screeds, coatings, adhesives and also for polishing decorative screeds, resin finishes and concrete. Diamond discs or shoes rotate within the body of the machine to produce the desired surface profile. When selecting accessories, it is important to examine the type of surface being treated. A hard composition surface will require a soft bond diamond and a soft composition surface will require a hard bond diamond. Hand grinders are used to prepare edges. The introduction of PCD technology or Polycrystalline Diamond has provided an innovative solution to remove adhesives, thermoplastics, bitumen and elastomeric coatings quickly, efficiently and cost effectively whatever the project size.
MULTI-STRIPPERS Multi-stripping machines are available in compact walk- behind models for small projects and large ride-on electric or propane powered machines for large-scale projects. Multi- stripping is the method for removing; wood, laminate, vinyl, carpets, rubber, ceramic, stone tiles, underlying levelling compounds and adhesives. A blade or pick is fixed to the front of the selected machine to cut under the material to be removed. It is often chosen when there is no other cost-effective option available. Once the material has been removed in most instances a further method of surface preparation is required to clean and profile for the application of the new product.
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