Dry Sheet Manufacturing via Integrated Pressurizing and Heating

The patent combines the pressurizing step and heating step into a single integrated process. The web is pressurized to a first pressure in the pressurizing step, then heated to a first temperature and pressurized to a second pressure (higher than the first) in the heating step. This merging allows the apparatus to achieve high sheet quality without requiring separate high-pressure equipment, thereby reducing overall apparatus size while maintaining manufacturing precision.

The patent employs parameter changes by sequentially adjusting pressure and temperature conditions. The web undergoes pressurization to a first pressure, then heating to a first temperature followed by pressurization to a second pressure. This staged parameter change approach enables high-quality sheet production through controlled thermal and mechanical treatment without requiring continuously high pressure throughout the process, thus avoiding the need for large high-pressure apparatus.

The patent merges pressurizing and heating operations into an integrated process where the web is heated to a first temperature and then pressurized to a second pressure. This combination allows the thermal energy to soften the material, making subsequent pressurization more effective at lower pressures. The result is high sheet strength achieved through coordinated thermal-mechanical treatment rather than high pressure alone, reducing the energy required for pressurization while maintaining sheet strength.

The patent uses parameter changes by heating the web to a first temperature before applying the second pressure. This temperature elevation changes the material properties, making the web more compliant and easier to densify. The sequential parameter change (temperature first, then pressure) reduces the energy consumption compared to applying high pressure directly to cold material, as the heated material requires less energy to compress to the desired density and strength.