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How to distinguish the quality of plywood
1. When selecting plywood, the texture of the front and back of the board should be clear, without scraping putty, repairing glue, smooth and flat, without roughness. As for the feel of the sheet, it needs to have a certain degree of smoothness and not pierce the hands.
2. Each layer of veneer is the cornerstone of plywood with good load-bearing capacity and stable performance. The veneer of high-quality plywood should be uniform in thickness, free of voids, overlapping cores, degumming, lack of glue, mildew and other problems. In addition, single-wood plywood has better stability and is not easy to deform than mixed wood plywood.
3. The gluing strength of plywood is very important to the quality of the board. When choosing plywood, if one end of the board is swayed, if there is a "creaking" sound, it means the plywood's bonding strength is not high. Try not to use this kind of boards, as boards with weak bonding strength will affect the decorative effect or service life.
4. Although the plywood is composed of solid wood veneer, it needs to be glued with glue. Inferior plywood has a pungent smell and releases a large amount of free formaldehyde. Such plywood will harm human health. Therefore, environmentally friendly plywood should be used in the decoration board, and the environmental protection level should reach E1.
When choosing plywood, in addition to the appearance quality, the inner quality is more important. The veneer production of plywood, the adhesive used, and the veneer gluing process are three important factors that determine the quality of plywood. Corresponding to whether the plywood is environmentally friendly, glued strength, easy to deform, etc.
Three factors that determine the quality of plywood
1. Adhesive quality
Adhesive performance is an important factor affecting the structural strength and performance stability of man-made panels. The synthetic resin used in the production of plywood has excellent performance, sufficient bonding strength, reasonable distribution ratio of each component of the adhesive, and the prepared adhesive has stable performance, suitable resin content and viscosity, and has a long enough active period to ensure normal operation and product indicators Meet the requirements. In addition, the environmental performance of the adhesive determines the environmental quality of the finished plywood.
2. Veneer quality
The quality of the veneer has a great influence on the bonding strength. The veneer is made of solid wood by peeling. The preparation of the wood segment and the veneer peeling process have been paid enough attention. The wood softening treatment is well carried out, and the peeling conditions are controlled so that the various indicators of the veneer are at the best Good value, while also ensuring the moisture content and flatness of the veneer, and avoiding the deformation of the finished plywood.
3. Plywood gluing
Before gluing, pay attention to mastering the two links of glue amount and slab aging. If the amount of glue is too large, the cost is high; moreover, if the glue layer is too thick, the internal stress will increase and the glue will penetrate easily; if the amount of glue is too small, it is not conducive to the infiltration of the glue and the glue layer will be incomplete. Plywood has been maintained for a suitable ageing time, and made reasonable changes with climate change. The core board is integrated, and the phenomenon of core board lamination and separation from the seam is reduced. Excessive use of viscose can also cause excessive formaldehyde emissions.
