Jiang Xiaojun, Nantong Huayan Casting Co., Ltd. Grinding Disk Research Center, 226403

Abstract: How to correctly assemble and select grinding discs to achieve the goals of high efficiency, high quality and energy saving, Nantong Huayan The Yan Grinding Plate Research Center conducts research and comparison through many practical cases of special paper mills, and summarizes and proves that starting from the principles of grinding disc design and rationally optimizing the assembly form of the grinding discs in slurry preparation can improve the beating degree, wet weight, and It can improve uniformity, brooming rate, binding force and paper quality, and can reduce beating power consumption.

Keywords: grinding disc tooth profile; assembly form; beating efficiency; percussion degree

The grinding disc is the "heart" of the disc mill, and the grinding disc tooth profile has been modified over the past 100 years. The inheritance, reference and continuous improvement have resulted in a wide variety of grinding discs. Each specification of grinding discs has several to dozens of different tooth shapes, including disc integral grinding discs and sector-shaped split grinding discs. Generally speaking, the grinding disc tooth pattern is divided into straight-through type, semi-enclosed type and fully enclosed type according to the form of groove; the grinding disc tooth pattern is divided into loosening type, broom type and cutting type according to the use function. However, the above classification forms do not exist in isolation, and often appear in combination in actual production according to needs. Except for radial teeth and bidirectional tooth grinding discs without an inclination angle, most of the tooth patterns have a certain inclination angle relative to the radius of the grinding disc. A left-tooth grinding disc is called a left-tooth grinding disc, and a right-tooth grinding disc is called a right-tooth grinding disc (see Figure 1). In the production of special paper pulping, in addition to selecting the appropriate grinding disc tooth type, different combinations of right and left tooth grinding discs can also achieve different beating effects. (omitted) Han Sixi1 Wang Xudong1 Sun Chunfeng1 Jiang Xiaojun2

(Author’s affiliation: 1. Luohe Yinge Industrial Group Co., Ltd., Luohe, Henan, 462000; 2. Nantong Huayan Grinding Disc Research Center, Nantong, Jiangsu, 226403)

Abstract: Based on the production practice of NCR base paper of Yinge Special Paper Company, this paper introduces the joint exploration with Nantong Huayan Grinding Plate Research Center to analyze the bleached sulfuric acid of imported bleached kraft softwood pulp (NBKP). Based on the characteristics of salted hardwood pulp (LBKP) fiber, the idea and practical process of optimizing the tooth shape, material and beating process of the imported and domestic double-disc refiner blades, improving the binding force of the pulp, and simultaneously reducing the power consumption of LBKP pulping.

Keywords: beating and grinding disc; wet weight; tooth profile optimization; brooming; knocking degree

In the pulping process of papermaking production, how to choose the pulp type and index suitable for the given pulp type The tooth shape of the grinding disc can achieve the adaptability and stability of paper making, improve the bonding strength between fibers and various physical indicators of paper, which often troubles the pulping section and affects the production and paper quality of the later stages. The grinding disc is the core component that directly performs multiple functions on the fiber raw materials when the refiner is working. The grinding disc plays a key role in affecting the quality of pulping. In order to meet market demand, Yinge Special Paper Co., Ltd. launched a second phase of a new 50,000-ton imported paper machine production line in 2009 based on the original 20,000-ton release paper and carbonless copy base paper (NCR). The raw materials used Imported NBKP softwood pulp and part of LBKP hardwood pulp meet the needs of NCR base paper production. Two 34-inch Taiwan Qinglai double-disc refiners have high pulping efficiency. After being put into production, in order to further improve the pulp performance and improve the paper quality, we cooperated with Nantong Huayan Grinding Disk Research Center collaborated to optimize the grinding disc tooth profile. This article focuses on the practice of optimizing the tooth profile of LBKP grinding discs to improve beating indicators and reduce power consumption. It is only for communication and reference within the industry. Zhang Qingyun 1 Jiang Xiaojun 2

(1. Shandong Wanhao Paper Group Co., Ltd., Linqu, Shandong, 262600; 2. Grinding Disk Research Center of Nantong Huayan Casting Co., Ltd., Nantong, Jiangsu, 226403)

Abstract: Based on the production practice of Wanhao Paper's A-grade coated paper pulping, this paper introduces how to improve efficiency through research and optimization of the tooth shape and material of the double-disc refiner grinding discs in collaboration with Nantong Huayan Grinding Plate Research Center. It improves pulp uniformity, improves paper smoothness and physical indicators, and reduces paper breaks in the coating machine, further stabilizing production.

Keywords: optimized grinding disc; energy saving; uniformity; physical index; knock degree

1. Overview

Wanhao Paper uses imported kraft softwood The production of A-grade high-grade coated paper from pulp requires not only good physical indicators, but also excellent formation and printability.

Paper formation not only affects the appearance value of art coated paper, but also affects the physical and optical properties of coated paper [1]. It is an important indicator of coated paper. Paper formation is the most studied and widely discussed topic in the industry. Despite this, in Formation is still the most volatile and difficult-to-control quality indicator in actual production in many paper mills.

In order to stabilize the physical indicators of coated base paper and reduce the phenomenon of paper glue holes and coated paper breaks, the Marriott Paper Technology Center and the Nantong Huayan Grinding Sheet Research Center have carried out technical cooperation to optimize the dual-processing process starting from the beating section. The tooth shape and material of the disc refiner grinding discs improve the uniformity of the pulp, improve the smoothness and physical indicators of the paper, and reduce the phenomenon of paper breaks in the coating machine, further stabilizing production. This article would like to make a brief summary from the perspective of production practice.