The laminate flooring consists of a four-layer structure.
The first layer: wear layer. Mainly composed of Al2O3 (aluminum oxide), it has strong wear resistance and hardness, and some reinforced laminate flooring made of melamine can not meet the standard requirements.
The second layer: the decorative layer. It is a layer of paper impregnated with melamine resin, and the paper is printed with wood grain or other patterns resembling precious tree species.
The third layer: the base layer. It is a medium density or high density laminate. After high temperature and high pressure treatment, it has certain moisture and flame retardant properties. The basic material is wood fiber.
The fourth layer: the balance layer. It is a layer of kraft paper with a certain strength and thickness, and is impregnated with resin to prevent moisture and floor deformation.
Main quality indicator
Surface wear resistance
Use ≥9000 rpm for public places and ≥6000 rpm for households. The above number of revolutions refers to the initial grinding value, that is, the surface finish is exposed, rather than the wear-resistant final value, that is, the floor is completely worn.
The market is that some laminate floorings have a high wear resistance, but they are likely to be the final wear value.
The water absorption thickness expansion ratio refers to the degree of increase in the water absorption thickness of the base layer after the reinforced composite floor is immersed in water at 25 ° C for a period of time. The greater the expansion ratio, the greater the strength drop of the floor after damp, and the surface protrusions or even falling off, seriously affecting the service life. At present, the size of the water absorption thickness expansion rate of various brands on the market can differ by more than ten times.
Surface impact resistance
That is, the impact test is performed on the floor in a prescribed manner, and the diameter of the pit left after the impact is the basis of the impact performance. The smaller the diameter, the better the impact resistance and the longer the service life. The laminate layer has a wear layer thickness of 0.1 mm or more and a thickness of 0.7 mm.
Formaldehyde emission
According to the provisions of GB18580-2001, the laminate flooring can be directly used for indoor products, so the formaldehyde emission must reach E1 level, that is, ≤1.5mg/L.
In addition to this, there are indicators such as static bending strength, internal bonding strength, density, moisture content, and bonding strength. The wear level and formaldehyde limit level should be clearly stated when selling.
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