2. Plywood is a three-layer or multi-layer plate-like material made of wood segments that are cut into veneers by rotation or sliced into thin wood with wood squares, and then glued with adhesives. Odd veneers are usually used, and the fiber directions of adjacent veneers are glued perpendicular to each other.
? Extended data:
The performance of 1. laminated products depends on the substrate, adhesive and molding process. According to its composition, characteristics and heat resistance, laminated products can be divided into the following two types.
(1) Laminated products with organic substrates-wood pulp insulating paper, cotton fiber paper and cotton cloth as reinforcing materials. Long-term use temperature can reach 120℃, and synthetic fiber products have been developed as reinforcement materials.
(2) Inorganic base plate-inorganic glass fiber cloth, alkali-free glass fiber felt, etc. Used as a reinforcing material. The long-term service temperature is 130~ 180℃, or even higher, depending on the adhesive resin.
2. laminated plastics products are divided into laminated plates, laminated tubes, laminated rods and molded laminated products according to their shapes and uses. Copper clad laminate (CCL) for printed circuits and tape capacitor bushing core for high voltage electrical appliances are two special products made in laminated plastics.
3, plywood types according to the bonding strength is divided into:
(1) Class I (NQF)- plywood with weatherability and boiling water resistance. This kind of plywood is durable, resistant to cooking or steam treatment and can be used outdoors.
(2) Class 2)II (NS)- waterproof plywood. It can withstand cold water or short-term hot water immersion, but it is not resistant to boiling.
(Class III (NC)- Moisture-proof plywood.
References:
Baidu encyclopedia-laminate
References:
Baidu encyclopedia-plywood