What Are The Main Factors Affecting The Quality Of Plywood Production?

Almost every process in plywood production affects the quality of plywood bonding to varying degrees. For the convenience of mastering, we summarize the following aspects:
1. Adhesive quality
It is manifested in several aspects such as the performance of the synthetic resin adhesive for glue, the coordination of each component and the glue mixing process. In recent years, a lot of research work has been done on the glue composition and glue mixing process for plywood in China, which not only saves a lot of chemical raw materials, reduces product costs, but also improves product performance, which is a manifestation of technological progress. In production, only the synthetic resin used has excellent performance, sufficient bonding strength, reasonable distribution ratio of the adhesive components, stable performance of the prepared adhesive, suitable resin content and viscosity, and a long enough active period to ensure normal operation and product items. The indicators meet the requirements. The three most commonly used glues on the market (phenolic glue, triamine glue, and urea-formaldehyde glue) range from poor to good quality from urea-formaldehyde glue to phenolic glue. The quality of phenolic glue is the best, and the price is relatively expensive.
2. The quality of the veneer
The quality of the veneer, especially its surface condition, has a great influence on the bonding strength. The quality of the veneer should be given sufficient attention in the process of wood section preparation and veneer rotary cutting. The wood softening treatment should be carried out well, and the conditions of rotary cutting should be well controlled so that the indicators of the veneer are at the best value. At the same time, attention should be paid to the water content of the veneer. rate and flatness.
3. Plywood gluing
Before gluing, attention should be paid to grasp the two links of sizing amount and slab aging. If the amount of glue is too large, the cost will be high; if the glue layer is too thick, the internal stress will increase, and at the same time, it will be easy to penetrate the glue; The length of the aging time should be appropriate, and it can be changed reasonably with climate change. It is necessary to realize the integration of the core board and reduce the stacking and separation of the core board. It is necessary to pay attention to mastering the pressure of the rubber bead and the pressure reduction speed, especially when there is more water in the slab.