Wire section dewatering is a critical process in papermaking production, which directly impacts finished paper quality and production efficiency. As a core component for negative-pressure dewatering on the paper machine wire section, the operational stability of vacuum box covers for paper machinery is of vital importance.

Traditional covers made of stainless steel and cast iron are prone to abrasion, rusting, pulp adhesion and scaling under long-term negative pressure, slurry corrosion and friction with forming fabrics. Rapid equipment wear forces paper mills to shut down frequently for cover replacement. This not only interrupts continuous production and raises maintenance and spare part costs, but also causes uneven dewatering and surface defects on paper sheets, restricting production stability.

To resolve widespread maintenance and operation challenges across the industry, polyethylene vacuum box covers for paper machinery have been gradually adopted in various papermaking production lines. They effectively optimize dewatering performance of paper machine wire sections and ease production pressure caused by frequent cover replacements.

Compared with conventional metal plates, polyethylene features outstanding wear resistance and self-lubricating properties. It avoids damaging forming fabrics under long-term high-speed friction, and its surface resists adhesion of pulp fibers, fundamentally reducing channel blockage and surface scaling.

Vacuum box covers for paper machinery withstand acid, alkali, humid and negative-pressure environments, and resist deformation and cracking during long-term operation, greatly extending service life and cutting replacement frequency. Meanwhile, these polyethylene covers can be customized with long slots, dense holes, inclined flow channels and other structures to fit low, medium and high-speed paper machines.

Uniform and stable negative-pressure suction delivers consistent dewatering across paper sheets, stabilizes sheet dryness, improves finished paper quality, and supports long-term, high-efficiency and steady operation of papermaking lines.

This article is compiled and edited by Henan Jinhang Engineering Plastics Co., Ltd. (www.upeplastic.cn), Editor-in-Chief: Jinhang. The company specializes in the R&D and manufacturing of polyethylene vacuum box covers for paper machinery. Reproduction is permitted with clear source attribution.