What is the static bending strength in the wood floor? Internal bonding strength? Thickness expansion rate of water absorption? Surface bonding strength?
The plywood surface bonding strength more than 0.4MPa provisions of the state. The bond strength refers to the special adhesive for special steel clip (steel head bottom surface area of 400 mm2 2*2 cm) bottom surface adhesion in the specimen along the central, around the cut card head decoration layer board, cutting depth to the substrate surface, and then completely after the cement (1 hours later), then pull straight up, only more than 160 Newton pulling force to pull up the veneer layer, is consistent with the standard.
Water absorption thickness expansion rate refers to the strengthening of composite floor soaked in 25 degrees of water, after a period of time, the thickness of the basic water absorption increased by%. The greater the expansion rate, the greater the strength of the floor after damp down, and there will be surface protrusions or even fall off, seriously affecting the service life. At present, all kinds of brands in the market may have more than ten times the thickness expansion rate of water absorption. The national standard is 10%
In the combination of strength index is the key to reflect the quality of the internal fiber bonding material, should be more than 1.0MPa, the low strength products will cause delamination. Combined with the higher intensity on the floor better ability to withstand the temperature change, not cracking phenomenon, only relatively compact substrates for the wood floor, in order to ensure the long-term high temperature cracking, no deformation.
Mor is to determine the specimen under maximum load when the bending moment and bending section modulus ratio, the popular explanation to the panel as an example, when the board stress will cause some bending, this situation is called "bending", "mor" is a man-made board in force bending to break when it can withstand the pressure of strength, denoted by Mpa.
