In recent years, the northern regions of China, including Linyi, Xuzhou, and Henan, have experienced significant seasonal challenges during April and May due to rising temperatures and the widespread presence of poplar and willow cotton. These environmental factors have severely affected the production quality of Green Plastic PP Faced Plywood, particularly in terms of bonding performance.
During this period, the accelerated temperature increase leads to rapid moisture loss in veneers and adhesive pre-curing issues. Many plywood manufacturers fail to conduct timely pre-pressing and hot-pressing processes for plywood blanks, resulting in localized adhesive aging—especially at the edges and surface layers of the core veneer. Consequently, finished plywood products exhibit defects such as delamination, surface blistering, and peeling.
Our quality inspections across multiple factories revealed widespread but varying degrees of bonding failures. Common issues included:
- Core veneer delamination due to insufficient adhesive strength caused by premature curing.
- Surface blistering and peeling in plywood blanks, attributed to uneven adhesive distribution and excessive heat exposure before pressing.
- Edge separation as a result of adhesive degradation under prolonged high-temperature conditions before pressing.
The combination of seasonal heat and airborne poplar cotton exacerbates these problems. The cotton fibers may contaminate adhesive layers or veneer surfaces, further weakening bond integrity. To mitigate these issues, manufacturers must adjust production schedules, shorten the interval between gluing and pressing, and enhance workshop temperature control. Additionally, adhesive formulations should be optimized for higher-temperature conditions to ensure consistent plywood quality during this critical seasonal transition.
Proactive measures, including stricter process monitoring and climate-adaptive adhesive selection, are essential to maintaining the reliability of Green Plastic PP Faced Plywood in demanding environments.
