Wire section dewatering stands as a core process in papermaking production. As a key component for negative-pressure dewatering on the paper machine wire section, vacuum box covers directly determine dewatering efficiency and equipment maintenance workload of production lines. The wide application of polyethylene (PE) vacuum box covers effectively addresses long-standing maintenance pain points plaguing the papermaking industry.

Traditional covers made of stainless steel or cast iron were widely adopted in paper mills in the past, yet they suffer from rapid wear, poor corrosion resistance and severe pulp scaling. Frequent production halts are required for panel replacement, which disrupts continuous production, hikes labor and spare parts costs, and triggers quality defects including uneven dewatering, pinholes and rough edges on paper sheets, lowering the qualification rate of finished paper.

Compared with stainless steel and cast iron alternatives, PE vacuum box covers feature outstanding wear resistance and self-lubricating properties. Long-term friction with high-speed forming fabrics will not damage the wire mesh. Besides, they hardly adhere to pulp fibers, fundamentally avoiding channel blockage and surface scaling.

These panels also boast excellent acid and alkali resistance, perfectly adapting to the complex chemical slurry environment in the wet end of papermaking. They withstand humid and negative-pressure working conditions without deformation or cracking over long-term service, delivering a far longer service life than conventional metal plates and drastically cutting replacement frequency.

Furthermore, PE vacuum box covers support customized slot designs such as long slots, dense holes and inclined flow channels to fit low, medium and high-speed paper machines of diverse production lines. Consistent and even negative-pressure suction enables uniform paper sheet dewatering, stabilizes paper web dryness, improves finished paper quality and reduces energy consumption of wire section operation.

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