During the Mid-Autumn Festival, a time for family reunions, the workshop of Henan Jinhang Engineering Plastics Co., Ltd. (Henan Jinhang) was a hive of activity. Forgoing the holiday, the entire maintenance team concentrated their efforts on a specialized overhaul of the No. 2 UHMW-PE (Ultra-High Molecular Weight Polyethylene) sheet production line. This in-depth maintenance aimed to eliminate potential equipment faults and enhance production precision, thereby solidifying the hardware foundation for the continuous supply of high-quality, wear-resistant sheets to industrial clients—including steel mills, coal mines, coking plants, glass factories, cement plants, thermal power plants, ports, and machinery manufacturers.

UHMW-PE sheets serve as essential wear-resistant components across various heavy industrial sectors. Applications ranging from underground coal mine bunkers, coking plant transfer chutes, and cement plant raw material silos to steel mill conveyor pads, thermal power plant coal handling systems, port discharge hoppers, glass factory tooling sliders, and machinery wear pads all rely on this material to address critical issues such as material adhesion and clogging, impact wear, and corrosive degradation. Most downstream industrial enterprises operate on continuous production schedules with fixed windows for liner replacement, imposing rigorous demands regarding delivery timeliness and product quality consistency. As a specialized manufacturer of UHMW-PE sheets, Henan Jinhang recognizes that stable, reliable equipment is the prerequisite for producing high-performance sheets. The No. 2 production line is responsible for manufacturing large-format, thick UHMW-PE sheets; prolonged continuous operation inevitably leads to the gradual accumulation of issues such as mold wear, temperature control deviations, and hydraulic pressure fluctuations. If minor defects are not addressed promptly, they can compromise the material's mechanical properties—resulting in deformation, internal impurities, and reduced wear resistance—which significantly shortens the service life once the product is deployed on-site.

The overhaul plan for the Mid-Autumn Festival was formulated days in advance through the collaboration of the technical department and the mechanical maintenance team; a comprehensive maintenance checklist was created, covering every critical component of the machinery in detail. Maintenance personnel removed the mold cavity guard plates to polish and grind the working surfaces of the molding molds, repairing minor scratches and pits to prevent surface pitting during sheet pressing. They disassembled and cleaned the material barrel and screw, removing long-term carbonized deposits to prevent impurities from contaminating the material. All hydraulic station filter elements were replaced, multi-way hydraulic valve pressures were calibrated, and pressure-holding parameters were adjusted to resolve previous issues with slight pressure drops during the pressing of thick sheets. Multiple temperature sensors were recalibrated, and mold cavity heating zones were tuned section by section to eliminate localized temperature differences, ensuring uniform heating of the ultra-high molecular weight raw material. Simultaneously, the wear levels of drive chains and reduction gears were inspected, worn bearings and gaskets were replaced, electrical control cabinet wiring was tightened and cleaned of dust, and overload protection devices were tested. Upon completion of all maintenance procedures, a no-load test run was conducted, followed by small-batch trial production to measure sheet thickness tolerance and density, confirming that the finished products met all specifications. Maintenance personnel collaborated effectively, adhering strictly to process standards and performing performance tests after each step; the focus was on ensuring uniform material heating and stable molding density during production, thereby guaranteeing the core properties of the finished ultra-high molecular weight polyethylene (UHMW-PE) sheets—such as impact resistance, wear resistance, self-lubrication, and non-stick characteristics. Safety training was conducted concurrently with maintenance to enforce workshop safety protocols and ensure the maintenance work proceeded safely and systematically.

Foregoing the Mid-Autumn Festival holiday to carry out this major equipment overhaul reflects Henan Jinhang’s commitment to meeting customer delivery schedules. As the autumn and winter seasons approach, industries such as coal mining, coking, steel, cement, and thermal power enter a peak period for equipment maintenance, leading to a surge in orders for wear-resistant liners and chute plates. Many clients require expedited supplies for silo retrofitting and chute replacements. Operating production lines with unresolved defects poses significant risks to product quality; furthermore, a sudden equipment breakdown could delay order fulfillment and disrupt the clients' own on-site maintenance and installation schedules. After careful consideration, the company decided to schedule the maintenance shutdown during the Mid-Autumn Festival holiday; this timing allows them to avoid peak order periods and minimize the impact on customer supplies.

The maintenance technicians on-site noted that, although they could not return home for the holiday, they found their dedication worthwhile knowing that the repaired equipment would ensure the stable production of high-quality UHMW-PE (Ultra-High Molecular Weight Polyethylene) sheets—products that help mines, steel mills, and coking plants solve critical issues regarding silo wear and material clogging. Alongside hardware maintenance, Henan Jinhang maintains strict control over raw materials, insisting on the use of 100% virgin resin and strictly limiting the addition of recycled materials, thereby ensuring product quality through comprehensive management of raw materials, equipment, and processing.

Production will resume rapidly once the maintenance and commissioning of the No. 2 unit are complete. Henan Jinhang remains committed to the R&D and production of UHMW-PE sheets, continuing to supply wear-resistant liners, chute liners, equipment slide blocks, and other products to industries such as steel, coal mining, coking, glass, cement, thermal power, port operations, and machinery manufacturing. Through stable production capacity, superior quality, and reliable delivery, the company helps industrial and mining enterprises reduce equipment wear and lower production and maintenance costs.