5800/800 Sizing Machine

1.Equipment Overview

The 5800/800 sizing machine is a crucial piece of equipment in the papermaking industry for enhancing the properties and quality of paper. "5800" precisely indicates that the machine is suitable for a paper width of 5800mm, a parameter that is vital for large-scale and high-efficiency papermaking production lines. "800" accurately represents the size or specification of a key component, such as possibly the diameter of the sizing roller or the depth of the sizing tank, which directly influences the sizing effect and capacity of the machine.

This sizing machine typically consists of main components such as the sizing unit, the glue supply system, the transmission system, and the control system. Each component works in harmony to ensure a stable, precise, and efficient sizing process.

2.Working Principle

The common membrane transfer sizing machine operates based on a unique and efficient principle. Firstly, through a precisely designed metering component, such as a metering rod or metering knife, the glue is evenly pre-coated onto the high-speed rotating sizing roller. During this process, the precision and adjustment performance of the metering component are crucial as they can precisely control the thickness and uniformity of the pre-coated glue film to form a thin and uniform glue layer.

When the paper web passes through the nip formed by the sizing roller and other pressure rollers at a specific speed and tension, due to the pressure and contact effect, the pre-coated glue film on the sizing roller is accurately and evenly transferred onto the paper web. During this process, the surface characteristics of the sizing roller, the pressure in the nip, and the running state of the paper web are precisely calculated and optimized to ensure that the glue can fully penetrate and evenly distribute within the paper fibers, thereby achieving the desired sizing effect.

3.Main Features

Outstanding Glue Film Uniformity: The glue film, which undergoes precise metering and pre-coating treatment, fundamentally guarantees a high degree of sizing uniformity. This means that the sizing amount remains consistent in all directions of the paper, whether in width, length, or thickness, significantly enhancing the physical properties and surface characteristics of the paper, resulting in greater stability and consistency and significantly improving the quality and printability of the paper.

Significant Reduction in Rewetting Phenomenon: During the sizing process, the impact of the glue on the paper web when passing through the nip is relatively small, enabling effective control of the amount of glue penetrating into the paper sheet. Simultaneously, due to the uniformity and moderation of the sizing, the rewetting amount is significantly reduced. This advantage not only helps to minimize the number of web breaks at the sizing press, improving the continuous running stability of the paper machine, but also reduces the risk of paper deformation and quality fluctuations during subsequent processing.

High Operational Flexibility: Through the ingenious selection of metering rods of different specifications and materials, as well as the flexible adjustment of parameters such as the hardness and surface roughness of the rubber coating on the sizing roller, the sizing amount and glue distribution can be precisely controlled. This flexibility allows the sizing machine to adapt to a wide variety of paper grades and production requirements, enabling diverse operations such as surface sizing to enhance the water resistance and strength of the paper, or pigment coating to improve the appearance and print performance of the paper. Additionally, the equipment has the capability to perform different treatments on both sides of the paper, for example, applying heavy sizing on one side to enhance specific properties and light coating on the other side to optimize the surface characteristics, providing ample space for customized paper production.

Moreover, it can adapt to an extremely wide speed range, from a low speed of 50m/min to a high speed of 2000m/min, meeting the needs of different production scales and process requirements.

Remarkable Energy Saving and Consumption Reduction Effects: Due to the uniformity and precise control of the sizing process, unnecessary waste of glue can be reduced. Simultaneously, the optimized sizing technology helps to decrease the steam consumption during the post-drying process. This not only lowers production costs but also contributes to reduced energy consumption and environmental impact, aligning with the requirements of sustainable development in the modern papermaking industry.

4.Application Scope

Widely used in the production of various types of cultural papers, such as book paper and magazine paper, where sizing is employed to improve the smoothness, gloss, and print clarity of the paper to meet the demands of high-quality printing.

It also plays a significant role in the production of packaging papers, such as corrugated paper and whiteboard paper, by enhancing the compressive strength, water resistance, and burst resistance of the paper to enhance the protective performance and durability of the packaging.

The manufacturing of specialty papers, such as art paper and security paper, also relies on this sizing machine. Through precise sizing, unique properties and appearances are imparted to the paper to meet the requirements of special uses and high-end markets.

5.Maintenance and Care

Regular comprehensive inspections of the sizing roller should be conducted, including checking the surface wear condition, flatness, and cylindricity of the roller. For sizing rollers with severe wear or surface damage, timely repair or replacement is necessary to ensure uniform sizing and quality.

The metering components, which are crucial for ensuring sizing accuracy, need to be cleaned regularly to remove any possible glue residue, impurities, or dirt adhering to them, ensuring their normal operation and metering accuracy.

Components in the transmission system, such as gears, belts, and chains, should be inspected and lubricated regularly. Tension and tightness should be adjusted promptly to prevent wear, loosening, or slippage, ensuring the stability and reliable power transmission of the equipment.

Regular inspections and maintenance of the glue supply system, including pipelines, valves, pumps, and other components, should be carried out to ensure the smooth supply of glue and prevent leakage and clogging.

The electrical control system of the equipment should be inspected and maintained regularly to ensure the normal operation of sensors, controllers, and actuators. Software and parameters should be updated in a timely manner to adapt to changes in the production process and performance optimization of the equipment.

6.Operating Precautions

Operators must strictly follow the operating procedures, be familiar with the various functions and parameter settings of the equipment, and precisely control key parameters such as the sizing amount, machine speed, and pressure to ensure the stability of the sizing effect and paper quality.

During the production process, constant attention should be paid to observing the supply of glue, ensuring a stable glue level and avoiding situations such as glue breakage or insufficient supply. At the same time, the quality and temperature of the glue should be monitored, and any abnormal situations should be adjusted and handled promptly.

When starting and stopping the equipment, the prescribed sequence must be followed to avoid sudden starts or emergency stops due to improper operation, thereby reducing mechanical shocks and damage to the equipment and extending its service life.

Regular calibration and debugging of the equipment should be carried out to ensure the working accuracy and coordination of each component. At the same time, detailed operation records and fault reports of the equipment should be maintained to facilitate the timely detection of problems, analysis of causes, and adoption of effective solutions.

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