What changes does the vacuum structure design bring to the dewatering performance of Paper Machine Vacuum Couch Roll?
2026-06-05
1、In the papermaking process, web forming and initial dewatering are key stages that determine the running state of paper stock and the subsequent forming effect of paper sheets. Traditional couch rolls adopt simple solid or shallow hole structures, which can only complete limited water separation during operation. The Paper Machine Vacuum Couch Roll produced by East China Papermaking Machinery Co., Ltd. adopts a professional vacuum structure design, which fundamentally changes the working mode of traditional surface dewatering. The internal vacuum cavity and orderly distributed hole channels form stable negative pressure adsorption force during rotation. When wet paper stock passes through the roll surface, internal moisture can be quickly extracted from the fiber layer through vacuum suction. This structural change removes the dependence on natural water seepage and mechanical extrusion, providing stable and continuous dewatering power for the early forming process of paper webs.
2、The vacuum structure optimizes the uniformity of web dewatering and improves the stability of paper forming. Ordinary roller structures produce uneven extrusion force on the paper stock, resulting in inconsistent water content in different areas of the paper web. Local excessive moisture retention will cause loose fiber combination and affect the flatness of finished paper. The internal vacuum system of Paper Machine Vacuum Couch Roll forms uniform adsorption force across the entire roll surface. The penetrating suction effect acts evenly on the wet fiber web, making the moisture separation degree consistent in the transverse direction of the paper sheet. This structural feature reduces the occurrence of uneven fiber distribution and local wet spots, maintaining a stable running state of the paper web during high-speed operation and reducing abnormal fluctuations in the papermaking process.
3、The improved vacuum structure enhances the adaptability of the equipment to different pulp materials and production conditions. Different types of pulp, including wood pulp, mixed pulp and recycled pulp, carry different moisture contents and fiber binding states in the wet forming stage. Traditional dewatering rollers have fixed working limits and cannot adjust to variable production conditions. The internal vacuum cavity structure of Paper Machine Vacuum Couch Roll can form stable suction pressure according to actual production demands. It maintains steady dewatering effects for thin and thick paper webs, and fits the production requirements of various paper types such as cultural paper, packaging paper and household paper. The optimized internal flow channel structure also reduces water residue inside the roll body during operation, keeping the roll surface clean and reducing external water accumulation that may interfere with web forming.
