Three-layer parquet and laminate flooring is usually fitted with a click profile, which makes installation much easier. The profile and also the dimensions of the flooring elements in longitudinal and transverse direction must fit exactly so that the floor can be laid successfully later. The processing is therefore carried out first lengthwise and then crosswise in two successive double end tenoners, which process two parallel edges simultaneously. Some elements are extruded into the double end tenoner to optimise the click function.
Achieving maximum accuracy is also the reason why profiling takes place after surface processing. This has disadvantages: On the one hand, the surfaces of the elements are then more sensitive. The feed chains of the double-end tenoners must not under any circumstances leave scratches or even changes in gloss in the top coat or paper surface. On the other hand, the freshly milled profile lacks any surface sealing. After profiling, the profile is therefore treated with a water-repellent agent in the case of high-quality floor coverings. This increases the resistance to moisture, such as plaster water. There are special edge coating machines for the application of the hydrophobing agent.
A circumferential chamfer is often desired for design reasons. If this is the case, the chamfer is produced in one operation with the click profile. However, the bevel must then be painted in a further work step. This is also done in an edge coating machine or directly in the double end tenoner.
The connection of the two-layer parquet flooring planks with each other is usually done with a simple tongue and groove profile without click function.
