In the production of plywood, almost every process affects the gluing quality of plywood to varying degrees. For ease of understanding, the following aspects are summarized:
1. The quality of adhesive is reflected in several aspects, such as the performance of synthetic resin adhesive, the coordination of each component and the process of adjusting the adhesive. In recent years, a lot of research has been conducted on the components and process of adjusting the adhesive for plywood in China, which not only saves a lot of chemical raw materials, reduces product costs, but also improves the performance of products, which is a manifestation of technological progress. In production, only when the synthetic resin used has excellent performance, sufficient bonding strength, the proportion of each component of the adhesive is reasonable, the performance of the adjusted adhesive is stable, the resin content and viscosity are appropriate, and the activity period is long enough can normal operation and the indicators of the product meet the requirements be guaranteed.
2. Veneer quality The quality of veneer, especially its surface condition, has a great influence on the gluing strength. The quality of veneer should be paid enough attention in the process of wood section preparation and veneer peeling. The wood softening treatment should be carried out well, and the peeling conditions should be controlled to make the various indicators of the veneer at the best value. At the same time, attention should be paid to the moisture content and flatness of the veneer.
3. Before gluing and pressing plywood, attention should be paid to the amount of glue applied and the aging of the slab. Too much glue will result in high cost; too thick glue layer will increase internal stress and easy to penetrate glue; too little glue will not be conducive to the infiltration of glue liquid and the glue layer will be incomplete. The aging time should be appropriate and should be changed reasonably with climate change. The core board should be integrated to reduce the lamination and separation of the core board. Attention should be paid to the speed of glue layering and pressure reduction, especially when there is a lot of water in the slab.
In addition, the use of new technologies and new equipment, such as the use of high-efficiency jet veneer dryers, core board seaming machines, and core board leveling machines, can achieve continuous operations of gluing, assembly, pre-pressing, and hot pressing, and the use of mechanized loading and unloading, quick-closing hot presses, etc., can accurately control process conditions and ensure product quality.
