For every country, the paper industry is one of the basic industries that support the normal operation of the entire society. The entire technological process of the paper industry starts from the processing of raw materials, through pulping, papermaking, making rolls or sheet finished products, and processing into paper and cardboard.
Paper machinery and equipment
The paper machine mainly refers to a complete set of equipment that makes the pulp form the paper web. The basic components are divided into the wire section, press, pre-drying, post-pressing, post-drying, calender, reel, etc. according to the order of paper formation. The process flow is: the pulp output from the headbox is dehydrated and formed in the wire section, compressed in the press section to make the paper layer uniform, dried by pre-drying, then enters the post-press for sizing, and then enters the post-dryer for drying treatment. The paper is then smoothed using a calender and finally passed through a winder to form a mother roll.
The papermaking process is a continuous production process, so the continuous and orderly control of the production line becomes the key to the papermaking process. In the past, DC speed regulation (suitable for large and medium paper machines) and slip motor (suitable for small and medium paper machines) were generally used for control in the papermaking field, but nowadays, since the use of frequency converters can effectively improve the operating process of papermaking equipment, frequency converters It began to enter the paper industry on a large scale, and has achieved good technical and market effects.
In papermaking transmission control, multiple transmission points drive a wire section or multiple transmission objects to exert pressure on each other to form a certain torque and operate synchronously. Load distribution control is adopted, and each associated transmission motor undertakes power output in proportion to its respective load. If the load distribution is not well adjusted, the load at each transmission point of the entire load loop will be unbalanced, the line speed will not be synchronized, and normal operation will not be possible.
There are various disadvantages in the traditional papermaking machinery, which greatly reduces the output and quality of the papermaking industry:
(1) The power of the motor used in the paper machine is relatively large, and the direct start of the power frequency has a large impact on the power grid and equipment, and consumes a lot of power;
(2) High current impact causes rapid equipment aging, high motor failure rate, and high maintenance costs;
(3) The old papermaking equipment relies on the slip motor to change the speed, the speed accuracy is low, the error is large, and the quality of the product is greatly affected;
(4) The speed of the motor cannot be adjusted during the refining process, so that the precision of the refining is not enough and the thickness is uneven;
(5) The flow control is adjusted manually, which affects the stability of the pulping flow, which affects the uniformity of the final product;
(6) The pressure of the drying equipment is also controlled by manual adjustment, and the drying effect is affected, making the toughness of the product uneven;
(7) The winding motor is completed by the speed regulation of the slip motor, the speed regulation accuracy is low, the error is large, and the pulling force of the paper towel is not constant;
(8) The toughness and uniformity of the paper towels are reduced, which seriously affects the quality of the product. Improper speed regulation will also cause the paper towel to be broken.
After using the frequency converter, these papermaking machinery can show various advantages after the transformation of the frequency conversion:
(1) The motor starts in a soft start mode, which reduces the impact on the power grid and equipment, and effectively protects the equipment and power grid;
(2) Various protections such as overvoltage, overcurrent, undervoltage, and overheating of the inverter reduce the failure rate of the motor and equipment and reduce maintenance costs;
(3) The frequency conversion speed regulation system improves the speed regulation accuracy of the motor, and the speed is smooth and stable, which greatly improves the quality of the product;
(4) Frequency conversion speed regulation can adjust the speed of the refining pump at will, which greatly improves the uniformity of pulping, thereby improving the quality and efficiency of the pulping process;
(5) Automatically control the flow of pulp and the pressure of the drying system through the frequency conversion system, thereby improving the quality of the product;
(6) Large torque at low frequency and fast torque response.
(7) The input voltage range is wide, which is more suitable for occasions far away from the power grid and with a large voltage fluctuation range;
(8) The steady-state precision of the operating speed is high, and the speed fluctuation range is small to ensure the quality of the product;
For every country, the paper industry is one of the basic industries that support the normal operation of the entire society. The entire technological process of the paper industry starts from the processing of raw materials, through pulping, papermaking, making rolls or sheet finished products, and processing into paper and cardboard.
Paper machinery and equipment
The paper machine mainly refers to a complete set of equipment that makes the pulp form the paper web. The basic components are divided into the wire section, press, pre-drying, post-pressing, post-drying, calender, reel, etc. according to the order of paper formation. The process flow is: the pulp output from the headbox is dehydrated and formed in the wire section, compressed in the press section to make the paper layer uniform, dried by pre-drying, then enters the post-press for sizing, and then enters the post-dryer for drying treatment. The paper is then smoothed using a calender and finally passed through a winder to form a mother roll.
The papermaking process is a continuous production process, so the continuous and orderly control of the production line becomes the key to the papermaking process. In the past, DC speed regulation (suitable for large and medium paper machines) and slip motor (suitable for small and medium paper machines) were generally used for control in the papermaking field, but nowadays, since the use of frequency converters can effectively improve the operating process of papermaking equipment, frequency converters It began to enter the paper industry on a large scale, and has achieved good technical and market effects.
In papermaking transmission control, multiple transmission points drive a wire section or multiple transmission objects to exert pressure on each other to form a certain torque and operate synchronously. Load distribution control is adopted, and each associated transmission motor undertakes power output in proportion to its respective load. If the load distribution is not well adjusted, the load at each transmission point of the entire load loop will be unbalanced, the line speed will not be synchronized, and normal operation will not be possible.
There are various disadvantages in the traditional papermaking machinery, which greatly reduces the output and quality of the papermaking industry:
(1) The power of the motor used in the paper machine is relatively large, and the direct start of the power frequency has a large impact on the power grid and equipment, and consumes a lot of power;
(2) High current impact causes rapid equipment aging, high motor failure rate, and high maintenance costs;
(3) The old papermaking equipment relies on the slip motor to change the speed, the speed accuracy is low, the error is large, and the quality of the product is greatly affected;
(4) The speed of the motor cannot be adjusted during the refining process, so that the precision of the refining is not enough and the thickness is uneven;
(5) The flow control is adjusted manually, which affects the stability of the pulping flow, which affects the uniformity of the final product;
(6) The pressure of the drying equipment is also controlled by manual adjustment, and the drying effect is affected, making the toughness of the product uneven;
(7) The winding motor is completed by the speed regulation of the slip motor, the speed regulation accuracy is low, the error is large, and the pulling force of the paper towel is not constant;
(8) The toughness and uniformity of the paper towels are reduced, which seriously affects the quality of the product. Improper speed regulation will also cause the paper towel to be broken.
After using the frequency converter, these papermaking machinery can show various advantages after the transformation of the frequency conversion:
(1) The motor starts in a soft start mode, which reduces the impact on the power grid and equipment, and effectively protects the equipment and power grid;
(2) Various protections such as overvoltage, overcurrent, undervoltage, and overheating of the inverter reduce the failure rate of the motor and equipment and reduce maintenance costs;
(3) The frequency conversion speed regulation system improves the speed regulation accuracy of the motor, and the speed is smooth and stable, which greatly improves the quality of the product;
(4) Frequency conversion speed regulation can adjust the speed of the refining pump at will, which greatly improves the uniformity of pulping, thereby improving the quality and efficiency of the pulping process;
(5) Automatically control the flow of pulp and the pressure of the drying system through the frequency conversion system, thereby improving the quality of the product;
(6) Large torque at low frequency and fast torque response.
(7) The input voltage range is wide, which is more suitable for occasions far away from the power grid and with a large voltage fluctuation range;
(8) The steady-state precision of the operating speed is high, and the speed fluctuation range is small to ensure the quality of the product;
continue reading
Related Posts
Variable Frequency Drives (VFDs) and motors are integral components in industrial automation, each serving distinct yet interconnected roles in controlling […]
Variable frequency motors (VFMs) are crucial in modern industrial applications due to their efficiency and precise control over motor speed […]
Variable Frequency Technology (VFT) is increasingly being recognized as a game-changer in the industrial automation sector, particularly in applications involving […]