A three-layer composite floor and its manufacturing method

Abstract

The invention provides a three-layer composite floor. The three-layer composite floor sequentially comprises a surface plate, core plates and a bottom plate from top to bottom. The surface plate at least comprises a high-density layer and a transition layer from top to bottom. The average density, on the thickness cross section, of the high-density layer is 0.65-0.75 g / cm<3>, and the density, on the thickness cross section, of the transition layer is gradually decreased from the side close to the high-density layer to the side close to the core plates. The high-density heavy layer and the transition layer are naturally connected in a same material mode. The three-layer composite floor has the characteristics that surface smoothness is good, the product stability is good, and surface wave traces are not prone to occurring.

Description

technical field [0001] The present application relates to the field of floor technology, in particular to a three-layer composite floor and a manufacturing method thereof. Background technique [0002] Three-layer composite flooring is one of the mainstream product categories in composite structural flooring products. The current three-layer composite floor mainly includes such a structure: the surface board, the core board and the bottom board (or back board). The veneer, the core board is a wooden curtain made of small fast-growing wood materials, and the bottom board is a veneer made of fast-growing wood through planing or frame sawing. It is made by gluing three layers of materials in the form of wood grains perpendicular to each other become. Therefore, the three-layer composite floor has the advantages of simple structure, safety and environmental protection, and good structural stability, and is deeply loved by consumers. However, compared with the multi-layer comp...

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Problems solved by technology

However, there are operability defects in the above scheme. The fast-growing wood veneer used as the surface board has been encrypted and then densified and fixed. Therefore, the following two problems will appear in the actual use process: First, the fixation after densification Treatment is an essential process, and the stability of the surface board after fixing treatment (it can be seen that the surface board of the three-layer composite floor must reach a certain thickness to avoid the traces of the core board wooden curtain on the surface, so the surface board has the characteristics of solid wood ) is far superior to the core board and back board. In actual use, there will inevitably be gluing and ungluing caused by inconsistent shrinkage or expansion of the front board and the core board and back board; However, there is always a tendency of thickness rebound in use, and fast-growing wood has serious anisotropy, and the differences are also reflected in the rebound difference between different longitudinal sections of the section. This difference must be in the In actual use, wavy traces are formed on the surface of the panel. Further, when the surface is accurately printed with wood grain, the wavy traces will be more serious than those that are only coated with paint

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