Kirjoittaja Aihe: A guide to check the quality of plywood formwork (Luettu 1893 kertaa)

upamfva · 19.07.22 - 07:21

A guide to check the quality of plywood formwork

Quality inspection of formwork plywood is an important step should not be overlooked when selecting products. So how do we know if the formwork is good, meets the requirements of construction or not? To get more news about Medium density fibreboard, you can visit boosterplywood.com official website.
As a component that helps bonding plywood and fixes water resistance, the adhesive used when formworking is usually WBP. WBP (water boiled proof) is commonly referred to as water-resistant glues such as phenolic, melamine ... If using WBP glue for plywood, when exposed to natural conditions outside rain, water, moisture for a long time (may be permanent), plywood will not be separated. In addition to WBP, MR is also waterproof, but its maximum boiling water resistance is only 30 minutes, so it is rarely used for building formwork.
Quality inspection of plywood

Plywood joints can be divided into seven grades in descending order of AA, A +, A, B +, B, C + and C. The better the wood, the better the quality of the wood. Heat more often than low quality bowels. The AA and A + joints are often used for very high quality plywood and at very high cost. Type A beams are used for high-quality plywood, which meets the standards of most European, American and Canadian countries. For most customers, the B + and B type of gutters meet the requirements because they are affordable and of acceptable quality. Particularly for C + and C types, due to its low quality, it is usually used only for the back of the chair.

Plywood is made from wood such as eucalyptus, acacia, rubber, hardwood, combi, ... Hardwoods, broad canes such as oak, cherry, walnut, ... or fragrant birch wood. Lightweight is often used as flooring or high-grade furniture. Poplar (white / yellowish wood) is high in plasticity and is suitable for plywood. However, in Vietnam today, poplar wood is usually C + and C wood originated from China, so badly affect the quality of formwork. Particularly, all kinds of wood from acacia, eucalyptus, rubber ... due to the toughness, resistance to weather conditions, curvature and low expansion, the quality is stable, suitable for formwork build. Moreover, under the natural conditions of Vietnam, these trees are very easy to grow and are grown popular, so used to make plywood intestines will give good quality and affordable.

To check the quality of the filmed plywood sheath, you cut the board into several small plates, if the gut is tight, the better the quality, the higher the hole if the more likely that the board is grafted from the veneer layer Small should be of low quality.

Check the volume of boards

To check the quality of the plywood, in addition to plywood and glue, the weight of the board is also an important criterion. Plywood formwork meeting the requirements of construction quality must have a volume of over 30kg / sheet, usually 33kg / sheet. Therefore, please pay attention to this parameter when choosing to buy products offline.