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Plywood is a three- or multi-layer plate-like material obtained by peeling a veneer from a wood section into a veneer or a wood veneer, and then bonding it with an adhesive. Usually, an odd-numbered veneer is used, and adjacent veneers are formed. The fibers are oriented perpendicular to each other.
Plywood is one of the commonly used materials for furniture, and it is one of the three major panels of wood-based panels. It can also be used for aircraft, ships, trains, automobiles, construction and packaging materials. A set of veneers are usually formed by gluing the blanks in the direction of the wood grain of the adjacent layers. Usually, the front plate and the inner plate are symmetrically arranged on both sides of the center layer or the core. The slabs, which are arranged in a criss-cross pattern in the direction of the wood grain, are coated with glued veneers, and they are pressed with or without heating. The number of layers is generally odd, and a few are even. The physical and mechanical properties of the vertical and horizontal directions are less different. Types of plywood commonly used are plywood, plywood and the like. Plywood can increase wood utilization and is a major way to save wood.
The typical length and width specifications are: 1220×2440mm, while the thickness specifications are generally: 3, 5, 9, 12, 15, 18mm. The main tree species are: hawthorn, willow, poplar, eucalyptus and so on.
Basic parameters of sheet
Chinese name:Plywood
Foreign name: Plywood
Nature: plate material
Alias ​​Multilayer Boards; Laminates
Features: small deformation; small shrinkage; smooth surface
According to use points: ordinary plywood; veneer plywood
By wood: hardwood plywood; coniferous plywood
Grade: excellent product; first-class product; qualified product
Application: partition wall; ceiling; wall skirt; facade
The basic principle
In order to improve the anisotropic properties of natural wood as much as possible, the properties of the plywood are uniform and the shape is stable. In general, the plywood must follow two basic principles in structure: one is symmetry; the other is that the veneers of the adjacent layers are perpendicular to each other. The principle of symmetry is to require veneers on both sides of the plane of symmetry of the plywood, regardless of the nature of the wood, the thickness of the veneer, the number of layers, the direction of the fibers, the moisture content, etc., which should be symmetrical to each other. In the same plywood, a single species and thickness of veneer may be used, or veneers of different species and thickness may be used; but any two symmetrical veneer species and thicknesses on both sides of the symmetrical center plane should be the same. The back panel does not allow the same species.
To make the structure of plywood comply with the above two basic principles at the same time, its number of layers should be odd. Therefore, plywood is usually made into three-layer, five-layer, seven-layer and other odd-numbered layers. The names of the plywood layers are: the surface veneer is called the surface plate, the internal veneer is called the core plate; the front surface plate is called the panel, the back surface plate is called the back plate; the core plate, the fiber direction is parallel to the surface plate It is called long or medium board. When forming the platen slab, the face plate and the back plate must face outwards.
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PVD (physical vapor deposition) coating is a type of Surface Treatment that is used to improve the performance of metal parts, by applying a thin layer of material onto the substrate through a vacuum chamber. This process provides a range of benefits, including increased hardness, improved wear resistance, and enhanced corrosion resistance.
PVD coatings are typically applied to metals such as stainless steel, titanium, and aluminum. They are particularly useful in applications where the substrate is subjected to high wear and tear, as the coatings help to reduce friction and limit the damage caused by abrasion. They are also used in the automotive industry to provide an aesthetic and functional finish to exterior parts.
PVD coatings can be tailored to meet specific application requirements, with a range of coating materials available, including titanium, chromium, and zirconium. These coatings can be deposited in a range of colors, such as black, gold, and silver, giving designers and manufacturers the flexibility to create parts with the desired appearance.
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PVD coating is applied through a series of steps, including cleaning and pre-treatment of the substrate, coating material deposition, and post-treatment, such as polishing or annealing. The result is a thin, uniform layer of coating that provides a range of functional and aesthetic benefits.
In conclusion, PVD coating is a versatile and effective surface treatment for metal parts. It offers a range of benefits, including improved hardness, wear resistance, and corrosion resistance, as well as aesthetic options. By enhancing the performance and durability of metal parts, PVD coating plays an important role in improving the reliability and efficiency of a range of industries and applications.
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