Board is the key factor that decides dining-room chair quality, how should dining-room chair be mastered when making board face?
First, observe the principle of symmetry.
Veneer on either side of the center of symmetry plane, regardless of trees, veneer thickness, layer number, manufacture method, the fiber direction and the moisture content of veneer should correspond to each other, namely the symmetry principle of plywood layer corresponding to different direction on both sides of the center plane stress are equal in size, support in the plywood moisture content change, stable structure, not deformation, cracking and other defects.
For the chair in the restaurant to eat the food in the process of heat, and the use of clean cleaning and so on will cause water in the process of change, affect the fast food restaurants chair desktop deformation plays important role in stability of checks and balances, maintain the appearance of the perfect effect.
The principle of odd layers is also always important.
Because the structure of plywood is perpendicular to each other, it must conform to the principle of symmetry. Therefore, the total number of layers must be odd.
The maximum horizontal shear stress is applied to the center veneer, which has a great strength.
This can support the board to achieve the ideal long service life.