PUR Floors Require Different Ways Of Welding
Paul Jarvis on good riddance to bad welds – part 3
YOU will surely have encountered new easy-clean safety flooring incorporating PUR technology. Product names vary according to manufacturer, but the technology remains basically the same.
An additional polymer component (usually polyurethane) is included in the surface layer or throughout the entire wearlayer of the flooring. The aim is to prevent dirt retention around the slip resistance particles during cleaning, enabling the floor to be maintained more quickly and easily.
These flooring ranges often include other features aimed at retaining the appearance of the flooring between cleaning and over time. For example, these might include colour retention features, use of pattern and texture to
minimise appearance of soiling, and resistance to stains and chemicals.
Due to this additional component in their makeup, it is likely that the method of welding will need to be slightly different to that for a traditional safety flooring.
Obviously, the best approach is to seek advice from the manufacturer of the flooring involved, but here are some of the tips we pass on to contractors who phone our technical hotline.
As with standard material all joints must be cut in before grooving. Do not butt or gap the joints. It is important to ensure that the joints are grooved correctly to a depth of 75-90% of the thickness of the material to fully expose the PVC edges of the sheet.
Unlike standard material all internal mitres should be grooved in order to ensure the PVC edges are exposed. For external mitres, take care not to open the vertical joint too wide.
Individual welding guns can vary in their heat output. Site conditions, such as temperature and the quality of the power supply, can also affect the heat output.
So I always recommend carrying out test welds on-site to establish the optimum settings and speed.
For this type of product we recommended that the welding is carried out at a slightly higher temperature than that for standard material.
So a test piece is important and has value because, if you experience scorching, you can take
the necessary steps to lower the heat and slow the speed of travel down before welding the floor itself. This reduces the risk of damage.
Unlike standard material, trim off the weld when slightly warm. The use of a sledge when making the first cut is also recommended, ensuring that the spatula is held at a low angle to remove approximately 1mm of material before finally trimming the rod flush with the floor, again using the spatula.
Next month we will provide tips and techniques for welding safety flooring effectively when it is used in conjunction with rigid PVCu wall cladding. Paul Jarvis is a member of the Altro technical team.
T: 01462 489405
This article has been reproduced from the Contract Flooring Journal website. You can find them at www.contractflooringjournal.co.uk.