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Plywood Is One Of The Common Materials For Furniture
Jun 05, 2017

Plywood is cut from the wood section into a veneer or cut from the wooden square cut into thin wood, and then made of adhesive glue from the three or more layers of plate-like material, usually with odd-level veneer, and the adjacent layer of veneer Of the fibers are perpendicular to each other.

  Plywood is one of the common materials for furniture, one of the three panels of man-made board, but also for aircraft, ships, trains, cars, construction and packaging materials. A group of veneers are usually made in the direction of the adjacent layers in the direction of the adjacent layers. Generally, the panels and the inner panels are arranged symmetrically on either side of the center layer or the core. With the veneer after the wood by the direction of the criss-cross the composition of the slab, heated or not heated under the conditions of suppression. The number of layers is generally odd, and few are even. Vertical and horizontal direction of the physical and mechanical properties of small differences. Commonly used plywood type plywood, penta and so on. Plywood can improve timber utilization and is a major way to save wood

  The basic principle

  Plywood In order to improve the characteristics of natural wood anisotropy, so that the characteristics of plywood uniformity, shape stability, the general plywood in the structure must comply with two basic principles: First, symmetry; Second, adjacent layers of single-board fiber perpendicular to each other. The principle of symmetry is to require plywood symmetry on both sides of the plane of the board, regardless of the nature of wood, veneer thickness, layer, fiber direction, moisture content, etc., should be symmetrical. In the same plywood, you can use a single tree and the thickness of the veneer, you can also use different tree species and thickness of the veneer; but symmetrical center plane on both sides of any two layers of symmetrical veneer species and thickness to be the same. The face plate is not allowed to be the same species.

  To make the structure of the plywood at the same time meet the above two basic principles, its layer should be odd. So the plywood are usually made three, five, seven and other odd number of layers. The name of each layer of the plywood is: the surface of the board is called the table, the inner board is called the core board; the front panel is called the panel, the back of the table is called the back plate; the core, the fiber direction and the table parallel Called long core plate or medium plate. When forming a slab plate, the panel and the backplate must face outwardly.

  species

  Plywood In order to make full use of forest resources to develop plywood production, make the best use of our country's newly developed national standards (draft approval) according to the use of adhesive pull, the plywood is divided into decorative plywood (for the surface needs to paint transparent paint Furniture, sewing machines and all kinds of electrical appliances and other products), decorative plywood (for construction, furniture, vehicles and ship decoration materials), the general use of plywood (for packaging, bedding and other uses) and soft wood decoration Plywood (used for construction, furniture, vehicles, ships and other high-level decorative materials), plywood type according to the bonding strength is divided into:

  (1) Class I (NQF) - weather resistant, resistant to boiling plywood. This class

  Plywood with durable, resistant to boiling or steam treatment and other properties, can be used in the outdoors.

  (2) Class II (Ns) - Water resistant plywood.

  It can withstand cold water or short-term hot water immersion, but not resistant to boiling.

  (3) Class III (Nc) - tide resistant plywood.