Wood is a natural growth material. Due to the difference in the internal structure of the annual rings, it is impossible to make absolutely no deformation. There are usually two ways to reduce the deformation of the wood: one is to use an advanced dry degreasing equipment to dry and degrease the wood, so that when the wet wood becomes a dry usable material, the internal stress is less in the wood; the other is long The material is short-finger jointed (ie, longitudinally integrated, unloading internal stress to reduce deformation), and wide material is glued with narrow material (ie, lateral integration, reducing the deformation by reducing the annual ring of the root). This is the reason why vertical and horizontal (two-dimensional) laminated materials largely replace large-size solid wood materials in daily life.

Wood is a "sponge body" and "wet up and down" is another attribute. The asymmetry of the wood structure determines that the wet and shrinkage rates of the wood are different. A large number of scientific experiments have shown that the vast majority of wood, the chordwise (circumferential direction) wet ups and downs are doubled in the radial direction (diameter direction), is the longitudinal (tree growth direction) twenty times relationship, and the tensile strength On the contrary, the longitudinal tensile strength of wood is twenty times the relationship between the string and the radial direction. This is the reason why the cross-stacked and viscous wood boards such as plywood have been reduced by a dozen times due to the lateral wet-up and shrinkage rate, and the tensile strength has increased by a factor of ten to replace the solid wood board.

Obviously, the replacement of large-scale materials by vertical and horizontal (two-dimensional) laminated materials can solve the deformation problem, but still can not solve the problem of excessive lateral expansion and shrinkage. If the two-layer transverse veneer is glued on the basis of the vertical and horizontal (two-dimensional) laminated materials, the deformation problem is solved, and the lateral wet-up and shrinkage problem is solved. Since the transverse tensile strength is increased by a dozen times, in fact, Solved the problem of lateral cracking and reduced lateral deformability. We call such a laminated material a vertical and horizontal three-dimensional laminated material.

Among the indoor wooden decorative materials, the materials expressed by Chinese wooden door experts in solid wood form have always been the most luxurious and vital. Daisheng solid wood composite products, such as door covers, window covers, wooden doors, etc., are based on vertical and horizontal three-dimensional laminated materials (or two-dimensional vertical and horizontal laminated materials), using the bending pressure (flat pressure) hot pressing process, bonding The processing of precious veneer is widely praised by the majority of owners.

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