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致力于节能减排技术的研发与应用，现有业务聚焦于造纸行业重要设备的设计、制造、销售以及与节能降耗和环境保护相关的技术服务和工程实施 -
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Blog
Blog
Focusing on the research, development, and application of energy-saving and emission-reduction technologies, with deep expertise in energy efficiency and consumption reduction within the ventilation and drying segments of the paper-making industry.
Blog – Hunan Zhengding Environmental Technology Co., Ltd.
23
2026-10
Contact heat transfer in Yankee cylinders has an efficiency ceiling. High-speed, crescent‑shaped tissue machines rely on Yankee hood systems to deliver directed convective hot air, breaking through the moisture film on the paper web and accelerating evaporation. Combined with waste‑heat recovery from the hot‑air circulation, this approach not only boosts machine speed and stabilizes the paper web—ensuring consistent bulk and minimizing creping defects—but also reduces steam consumption. The airflow within the Yankee hood is systematically arranged along the cylinder’s curved surface; unlike conventional sealed hoods, its precise airflow management is key to stable production and reduced paper defects, making it ideal for new‑machine installations as well as energy‑saving retrofits of existing lines.
2026-10-23
20
2026-10
The closed hood is a core auxiliary device for the dryer section of paper machines, suitable for production lines manufacturing decorative base papers, household papers, specialty papers, and more. It also serves as a key component in energy‑saving retrofits for older paper machines. By isolating the dryer section with an airtight structure and integrating supply and exhaust ventilation along with a zero‑pressure air system, it precisely controls temperature and humidity inside the hood, rapidly removes moisture, and retains residual heat. Advantages: excellent sealing and thermal insulation; stable air pressure reduces paper defects; modular design facilitates maintenance and operation; and it can be integrated with waste‑heat recovery systems to achieve energy savings. This technology enhances product quality, lowers steam consumption, improves workshop working conditions, and minimizes downtime.
2026-10-20
17
2026-10
The enclosed hood is a key piece of equipment in the technical upgrade of the paper machine’s drying section; selection should not be based solely on price, but must align with the specific site conditions. Core functions: stabilizing the quality of web drying, reducing steam energy consumption, and improving the workshop’s humid‑hot environment. Key considerations in selection: airtight enclosure structure, zero‑pressure control, compatibility with paper grades and machine speed, and ease of installation and operation. Common pitfalls in upgrades: relying exclusively on price comparisons, blindly copying solutions from other plants, or undertaking isolated modifications without integrating waste‑heat recovery. ZDET offers a comprehensive, tailor‑made, end‑to‑end solution for enclosed hoods, helping paper mills achieve stable production and energy savings, and can provide detailed feasibility assessments.
2026-10-17
06
2026-10
The Jiangsu Xingguang New Materials PM8 project has successfully commenced operations.
Good news from the Xuzhou, Jiangsu project site: the enclosed hood ventilation system for the PM8 machine—designed, manufactured, and installed by Zhengding Environmental—has been successfully commissioned, with a production speed of 2,640–500 m/min for decorative base paper.
2026-10-06
01
2026-10
National Day Tribute | Steadfastly Devoting Ourselves to Ordinary Roles—Perseverance Itself Is a Commitment
2026-10-01
24
2026-09
This article combines professional technical explanation and introductory popular science, focusing on analyzing the application of Closed Hood and Yankee Hood in drying and ventilation systems.
2026-09-24
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