In the core dewatering area of modern papermaking machinery, vacuum box covers play a crucial role. With advancements in materials technology, polyethylene vacuum box covers have completely replaced traditional metal materials, becoming a key innovation for improving production efficiency and reducing operating costs.

Traditional cast iron or stainless steel covers have long faced problems such as rapid wear, easy corrosion, and high frictional resistance. Polyethylene vacuum box covers, however, boast superior wear resistance—a wear coefficient more than seven times that of carbon steel—able to withstand long-term erosion from pulp fibers and fillers, significantly extending their lifespan. Their lower coefficient of friction allows wet paper to pass through smoothly, reducing the risk of paper breakage and lowering drive energy consumption.

In terms of structural design, modern polyethylene vacuum box covers mostly adopt a modular strip design, with each strip typically 80-100 mm wide. Specific hole patterns and arrangements can be configured according to the dewatering requirements of different paper types. This design achieves two breakthroughs: firstly, locally worn strips can be replaced individually, reducing maintenance costs by more than 60%; secondly, it optimizes vacuum distribution, resulting in more uniform dewatering and directly improving paper quality. Practical application data shows that using high-quality polyethylene vacuum chamber covers can improve paper machine dewatering efficiency by 8-15%, extend forming wire life by approximately 30%, and reduce overall energy consumption by 5-8%. These improvements are particularly significant for high-speed paper machines, maintaining stable dewatering performance even at speeds exceeding 1200 meters per minute.

This article was edited and compiled by Henan Jinhang Engineering Plastics Co., Ltd. (www.upeplastic.cn), with Jinhang as the editor. The company specializes in the research and development and production of polyethylene vacuum chamber covers. Reproduction is welcome, please indicate the source.