How to distinguish between good and bad construction wood board?
Looked up look up mark imported plywood original packaging is printed with English letters. Made 1. mark. Marked 2. specifications, the general standard 3mm x 4 x 8 or 1220 x 2440 x 3mm, some standard 4 x 8 x 3PLY (4 x 8 three layer), and some direct plate thickness 2.7mm. 3. marked adhesive for plywood, the glue can be divided into a class and two kinds of rubber, a / is waterproof glue, codenamed "P", the two is waterproof glue, codenamed "D". Marked 4. grade standards, grade AA, grade AB, grade BB and grade CC, China imported more than a "mixed level 22" and "33" in each half. As for BB, the market of CC grade plywood, a It is sheer fiction. The import package is marked with the "D/BB, D/CC" mark. Some 5. is printed on the port of shipment and the port of destination, each box has the sequence number, especially with the patterned trademark in the eye-catching position.
See the appearance quality of sheet plywood panel through the sanding after smooth like paint, no splicing, no serious defects excluded crack patching, without a large area or more; the edge of the periphery of neat and smooth; the side plate (core board) fancy stitching, no obvious seam (Diego Diego core), basically no centrifugation; the thickness of not less than 2.7mm; take up the whole Zhang Banping without abnormal noise, the board should not degumming, bubbling, lack of core etc..
Look at the packaging most imported plywood packaging is lined with plastic sheets, packaging with 4 to 5 root wood backing. Four sides with wooden support, vertical and horizontal there are more than 5 iron bars packaged, usually 200 dozen into one, printed in the box on the number of qing.
Same specification1. look at raw materials. The raw material monoliths and scrap.2. glue. Phenolic resin. Three amine gel. Glue (glue urine)The simplest test: take a 10cm*10cm sample and cook it. It is easy to open plastic goods (less than 30 minutes)Boil for 1 hours.Boil for more than 3 hours, even if the good
