Introduction of specifications and thickness of plywood in Shandong Province
Plywood is a kind of three or more layers of laminated material, which is made up of wood segments cut into veneers or planned into thin wood, then bonded with adhesives. Plywood manufacturers usually use odd layers of veneers and make the fibers of adjacent layers of veneers perpendicular to each other.
Plywood can be divided into ordinary plywood (plywood for wide use) and special plywood (plywood for special use).
The quality requirements of plywood include appearance grade, size and physical and mechanical properties.
Appearance grade, specification size, physical and mechanical properties of the three tests are qualified to judge that the product is qualified, otherwise judged to be unqualified. When the plywood leaves the factory, it should have the product quality certificate of the quality inspection department of the production plant, indicating the types, specifications, grades, bonding strength and moisture content of the plywood.
Specification and size of ordinary plywood: plywood thickness is 2.7mm, 3.3mm, 4.5mm, 5.5mm, 6mm… from 6mm, increase by lmm. The thickness of plywood is less than 4 mm. 3 mm, 3.5 mm and 4 mm thick plywood are commonly used specifications. Plywood of other thicknesses shall be manufactured by agreement between the supplier and the demander.
Appearance Grade: The ordinary plywood is divided into four grades according to the material defects and processing defects that can be seen on the processed plywood: special grade, first grade, second grade and third grade, among which the first grade, second grade and third grade are the main grades of the ordinary plywood.
The above four levels of panels should be sanded (scraped) light, special needs can not be sanded (scraped) light or two sides of sand (scraped) light. Sanded plywood is a kind of plywood whose surface is sanded (or scraped) by sander (or scraper). Generally, the grade of plywood is determined by visual inspection of allowable defects. Grades depend on allowable material defects, processing defects, and splicing requirements.