The layers of three-layer parquet are (from bottom to top) backing veneer, core layer and top layer. During the gluing process all components are first laid and glued before the actual pressing process takes place. There are many different procedures for this. To increase efficiency, it is common practice to form elements from two or more planks next to each other and glue them together in one piece. They are then divided into individual planks by a saw cut.
The middle layer or core of three-layer parquet usually consists of strips of coniferous wood, which are arranged in a crosswise direction. The strips are laid crosswise on the counter-layer veneer. They can either lie next to each other without gaps or keep a distance to save material. In the edge area, where the tongue and groove joint is later made, plywood slats often supplement the solid wood lamellas for reinforcement. The middle layer can also be prepared in advance and stored temporarily. In this case it is fixed with a special adhesive tape. However, the middle layer is often laid directly before pressing.
The entire process of layer formation takes place in a gluing plant. The glue is usually applied with rolling machines. Depending on customer requirements, it is possible to carry out individual steps manually or to automate the process partially or even completely.
