Working Principle of the Continuous Press
The working principle of a continuous press can be summarized as "continuous feeding, gradient pressing, synchronized heating, and dynamic forming."
1. Continuous Feeding: The uniformly formed mat (a mixture of wood fibers or particles with adhesive) is smoothly and continuously fed into the press inlet, which is formed by two giant endless steel belts.
2. Gradient Pressing and Heating:
The mat enters the wedge-shaped pressing zone created by the upper and lower steel belts. Here, it is gently "nipped" and initially compressed.
It then enters the Hot Pressing and Forming Zone. This zone is typically divided into multiple pressure sections (e.g., high-pressure, thickness calibration, low-pressure). A large array of computer-controlled small hydraulic cylinders applies precise pressure to the steel belts, creating the required pressure profile. Simultaneously, the heating system (hot oil or steam) maintains the belts at a constant high temperature (e.g., 180-220°C).
Under the combined action of high temperature and gradient pressure, the adhesive within the mat rapidly melts, flows, and cures, forming strong bonds between the wood components.
3. Continuous Forming and Discharge: The cured panel exits the press as a continuous sheet, which is then cut to predetermined lengths before proceeding to downstream processes like cooling and sanding.
Core Essence: It simulates the complete cycle of a traditional multi-opening press—"preheating, pressing, curing, pressure release"—but unfolds this cycle spatially along the press length. The mat experiences different stages as it moves through the press, translating the time-based cycle into a spatial one, thereby achieving uninterrupted continuous production.
