Misunderstanding of geothermal floor in the proces

2022-07-22
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This problem can be solved by pre stressing production process if the surface of multi-layer solid wood composite floor with thick skin (3~4mm) is guaranteed not to crack under geothermal environment. The advantage of multi-layer solid wood composite floor with thick skin is that the compression resistance of the skin is good, which has the characteristics of solid wood floor

myth 1: the thicker the skin of multi-layer solid wood composite floor is, the better.

if the skin of multi-layer solid wood composite floor with thick skin (3~4mm) is guaranteed not to crack under geothermal environment conditions, this problem can be solved through pre compression stress production process. The multi-layer solid wood composite floor with thick skin has the advantage of good compression resistance of the skin, which has the characteristics of solid wood floor. Because the surface of the floor is too thick, in the alternating process of ordinary environment and geothermal environment, with the change of moisture content of the floor, the floor will be greatly deformed due to the large expansion and contraction of the surface and the substrate. The author carried out the following experiments. The multilayer solid wood composite floor with a moisture content of 8% was tested in different environments. The surface thickness of the floor was 2mm, 3mm and 4mm respectively; Simulate the northern summer environment to make the moisture content of the floor reach about 13%, and then simulate the northern winter geothermal limit environment to make the moisture content of the floor reach 4%

Myth 2: the wider the floor, the longer the floor, the better

the length and width of multi-layer solid wood composite floor change with the change of environmental humidity. The larger the size of the floor, the greater the stress generated by the skin when the floor shrinks and swells, and the opportunity of floor deformation and skin cracking increases. The wider the multi-layer solid wood composite floor is, the larger the side gap generated during drying shrinkage is. Similarly, the longer the multi-layer solid wood composite floor is, the larger the gap at the end of the floor when drying and shrinking

myth 3: the geothermal floor backplane is slotted well, which is conducive to the flow of hot gas

some people think that the geothermal floor backplane is slotted well, which is conducive to the flow of hot gas, and even make the floor backplane into a hollow structure. In fact, the thermal conductivity of solids is higher than that of gases. The higher the density, the faster the heat conduction speed. This is also one of the important reasons why we improve the density of floor substrates. The longitudinal slot on the back of the floor forms an air layer at the slot on the back of the floor. Because the thermal conductivity of air (0.02 at 20 ℃) is lower than that of wood (about 0.08~0.18), the thermal conductivity effect is reduced to a certain extent. Hollow structure forms an air layer between the ground surface and the floor surface to reduce heat conduction. This structural floor will be better used in ordinary environment

myth 4: cut the moisture-proof film into strips for heat conduction

some floor installation companies did not stick the moisture-proof film tightly when installing the floor, and some installation companies in some places even cut the moisture-proof film into many small openings in order to breathe air and improve the heat conduction effect. Generally, after the geothermal project is completed, the water content in the ground cement is at least 17%. During the geothermal heating process, the water on the ground is constantly emitted outward, and directly acts on the back of the floor through the damaged moisture-proof film, resulting in floor delamination, bulging, paint frying and floor discoloration. Therefore, we should not only cut the moisture-proof film into many small holes, but also stick the moisture-proof film tightly with plastic tape to ensure airtightness, so as to avoid the harm of moisture in the ground to the floor

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