plywood grading Flexible plywood f plywood is not stiff and can rolled up. Thus, it used for creating rounded shapes in furniture.
Fire Retardent Plywood or FR Plywood:
Fire retardant plywood used at places where fire risks have to reduced. such as in shopping complexes, public theaters, restaurant kitchens. The surface of fire retardant plywood treated with fire retardant chemicals during manufacturing. so that it becomes better at resisting fire. It is also known as FR grade plywood.
Besides to the hardwood plywood grades, there are four common plywood bonding types. The difference is in the glues that used to bind the plies, or layers of the baltic birch plywood. The type of plywood you choose will depend on. what the material will subjected to after the installation is complete. For instance, if plywood will exposed to considerable moisture. marine plywood would be the best choice. But, for kitchen cabinets, interior plywood would be fine. as there's no reason to spend the extra money that plywoods with waterproof glue would cost.
Plywoods sheet goods for interior use only made from various hardwood. and softwood species and can used only in interior applications. such as wall sheathing, furniture. (where exposure to moisture limited), cabinetry and the like. Interior plywood is available in most grades. as well as many hardwood species such as birch, oak, and cherry.
For cabinetry projects and other plans that need one side of the sanded pine plywood to be visible to the user. sanded plywood would be the best choice. These sold as A-C plywood, with one side sanded to A grade while the interior sanded smooth side. which will not the user would be a lesser C grade. Most hardwood plywoods sanded A-C grades. but some SPF varieties are also sold as one-side sanded.
This is the most highest quality type of plywood, available at home centers. The inner cores glues used in exterior plywoods are much more resistant to moisture. than interior plywoods. Once again, all grades are available, with A-C, B-C, and CDX the most common. Many hardwood species are also available in exterior varieties.
When moisture resistance is a priority, look into marine plywood. This different grades uses the best adhesives glued together and manufactured to the highest standards. It also is most graded as A-A, with two top-grade faces, but limited in the hardwood piece veneers choices. that are practical for use in marine settings. Additionally, marine plywood is harder to find. and more expensive than other grades of plywood.
MR grade plywood means moisture resistant plywood. It is also known as commercial plywood. In moisture resistant plywood. urea formaldehyde resin used for bonding the plies with each other. Remember that ‘moisture resistant’ does not mean ‘waterproof’. It means that the plywood is capable of resisting humidity and moisture, and it is not resistant to water. So, this type of back veneer plywood is not used for making furniture that are in contact with water .
When the appearance of the face is of lesser concern than the strength and stability of the material. structural plywood will be the choice. The resins used to single piece adhere the plies designed. for extra strength to avoid separating the layers. Structural plywood is seldom found in a grade higher. It is commonly used in concrete forms on construction sites.
plywood sheets process
Woodworking projects in the whole production process of plywood, log sawing, veneer rotary cutting. veneer drying, veneer finishing, hot pressing, trimming. chopping light has an impact on wood loss, it divided into tangible Loss. (with processed residues) and intangible losses (dry shrinkage and compression).
Sawing of logs: the length of imported logs is generally more than 6 meters. to sawed according to the length. and quality required by the process, the intercepted wood section. should be the length of the finished plywood plus the processing allowance.
Veneer rotary cutting. the most used in plywood face veneer production is the veneer produced by the rotary cutting method. the thickness of the face back plate is generally about 0.6mm. and the thickness of the core plate and the long middle plate is generally about 1.8mm.
Single board drying: the moisture content of the veneer. after the rotary cutting is very high. the board must dried to meet the requirements of the gluing process. After drying, the wood becomes smaller in size and called dry shrinkage.
Single board finishing: single board finishing including cutting, jigsaw and repair. The stripped veneer. and the veneer cut into a specification veneer and a splicable veneer. The narrow veneers spliced into a single veneer. and the defective veneer can repaired to achieve the process.
Hot pressing: the good slab of the rubberized assembly. glued through a certain temperature and a certain pressure. As the slab temperature and moisture content change during hot pressing. the wood compressed and the slab thickness reduced.
Trimming: cut the hot pressed wool into a specification sheet. The amount of corner scraps cut related to the processing allowance and the size of the plywood. The larger the plywood web size, the smaller the trimming loss rate, generally 6% to 9%.
Sanding: sanding the surface of the plywood, making the surface smooth and beautiful. The waste generated in this process is sanding powder. When the quality of the veneer is good, the amount of sanding is small, and the sanding loss rate is generally 2% to 6%.
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