In the production process, printing and packaging companies have relatively high requirements for the processing accuracy of live jobs, the attention of operators, and reliable communication effects, but the production efficiency may be seriously affected by noise. Therefore, it must be fundamentally correct. Noise is effectively controlled.
In order to effectively control the noise in printing and packaging companies, there should be a more comprehensive understanding of the noise generation, transmission and ways of influencing the noise. This helps to more rationally design plants, install machines, and use existing noise. Control technology solves the noise problem in a targeted way.
Recording noise volume It is generally believed that noise with a sound pressure within 30-70 dB is not harmful to the human body. Hearing protection equipment should be worn when the noise level exceeds 120 dB. When the noise level exceeds 140 dB, it may harm people. The noise in the production workshop should be measured by professionals using appropriate instruments and experts can be hired if necessary. If the noise in the production workshop exceeds 90 dB, a detailed investigation should be conducted on the noise situation.
Usually a volume meter is used to measure a set of values ​​over a period of time, then average values ​​are taken and the maximum noise tolerance in a specific place is calculated. Measuring the noise reading with the volume meter is easy, but if the loudness of certain frequency bands cannot be measured with the volume meter, it can be measured again with other instruments. The instrument used is not expensive but it must be regularly calibrated. Check with zero reset performance.
Measurement of noise at different frequencies is generally considered to be a good method for assessing the effect of noise on the human body because it can clearly measure large noise at a specific frequency. Noise control consultants generally use this method and use instruments that are more expensive than instruments used to measure all noise. Noise volume is usually measured at the place where the machine operator is working, but measuring noise readings throughout the shop can also play a role. Then write the readings on the floor plan, indicating the location of the machine and the location of the wall, so that the machine (or machine part) that emits the noise can be identified to facilitate noise reduction. When the noise level in the workshop has been measured and another machine is to be installed, the noise volume that may be generated should be taken into consideration.
Sources of noise Noise comes from three sources: vibrating machine parts and surfaces, high-speed moving fluids, and other functional components.
The parts and surfaces of machines that are subject to vibration are often affected by the unsteady forces inside the machine, the rotating parts cannot be in absolute equilibrium, the bearing surfaces are not absolutely stable, gears and belt drives cannot transmit power seamlessly, and in addition, fluctuations occur. The electric field also causes corresponding changes in the motor, transformer and winding.
Noise and air noise can also be generated when air and water flow at high speeds. The machines that produce the most noise are often machines that produce noise from functional components (rather than defective components). For example, machines that generate impact can hardly cause noise in such machines. Because the function of such machines determines that they inevitably produce noise.
The volume of noise produced by a particular type of machine is related to: location and length of use of the machine, location of the operator, distance to other machines or noise sources, structure of the building and ground, installation of the machine, area and height of the workshop . The results of a survey of the printing company's noise volume indicate that some types of machines exceed the specified maximum noise limit, especially when several units of the same type are installed together or when the space is narrow, resulting in greater noise. Some production processes, due to their inherent properties, produce very high noise, such as web folding knives and their brackets, folding indentation rollers, and some noise from gears, bearings, and vents.
The noise generated by the drum groove and the screed roller stopper increases the noise level of the printing press. Factors that increase the noise volume include feeder airflow, blowers, air pumps, and anti-stick dirty spray devices. Platform presses produce more noise than rotary presses because the heavy components that move back and forth on the platform press have to be rapidly accelerated and decelerated repeatedly.
The folding machine in the binding plant inevitably produces noise because the rollers and the paper that is in high-speed contact with metal parts are noise sources. The noise generated by the folder can exceed 90 dB when several folding machines are installed close together. Noise generated...
Noise control measures Noise control itself is an application technique that reduces the noise volume and achieves an ideal working environment. The control of noise is to reduce interference in the work environment and eliminate various factors that degrade hearing. There are three basic methods for reducing noise, namely, reducing noise from the noise source, controlling the sound field to reduce noise at the receiving end, and acoustically processing the room to reduce reflected sound waves.
In theory, the above three methods can be used simultaneously, or only one of them can be used to control the noise. Controlling noise from the noise source is to reduce the mechanical vibration that generates noise. Controlling machine noise is a very complicated issue. It involves many mechanical vibrations of noise. Controlling machine noise is a very complicated issue involving the application of many special noise control technologies. In general, this is something machine builders should do.
Controlling the noise propagation path between the machine and the operator is a measure that many companies can take. It requires the use of closed or quarantine measures and sound absorption treatment of the ceiling and wall so that the noise can neither directly nor indirectly affect the operator. , Separating the various vibration sources helps to prevent the propagation of vibrations, and enclosure measures help to eliminate noise radiation from the noise source. Absorption processing eliminates acoustic reflections from the inner walls and surfaces, greatly reducing the room back. (To be continued)
In order to effectively control the noise in printing and packaging companies, there should be a more comprehensive understanding of the noise generation, transmission and ways of influencing the noise. This helps to more rationally design plants, install machines, and use existing noise. Control technology solves the noise problem in a targeted way.
Recording noise volume It is generally believed that noise with a sound pressure within 30-70 dB is not harmful to the human body. Hearing protection equipment should be worn when the noise level exceeds 120 dB. When the noise level exceeds 140 dB, it may harm people. The noise in the production workshop should be measured by professionals using appropriate instruments and experts can be hired if necessary. If the noise in the production workshop exceeds 90 dB, a detailed investigation should be conducted on the noise situation.
Usually a volume meter is used to measure a set of values ​​over a period of time, then average values ​​are taken and the maximum noise tolerance in a specific place is calculated. Measuring the noise reading with the volume meter is easy, but if the loudness of certain frequency bands cannot be measured with the volume meter, it can be measured again with other instruments. The instrument used is not expensive but it must be regularly calibrated. Check with zero reset performance.
Measurement of noise at different frequencies is generally considered to be a good method for assessing the effect of noise on the human body because it can clearly measure large noise at a specific frequency. Noise control consultants generally use this method and use instruments that are more expensive than instruments used to measure all noise. Noise volume is usually measured at the place where the machine operator is working, but measuring noise readings throughout the shop can also play a role. Then write the readings on the floor plan, indicating the location of the machine and the location of the wall, so that the machine (or machine part) that emits the noise can be identified to facilitate noise reduction. When the noise level in the workshop has been measured and another machine is to be installed, the noise volume that may be generated should be taken into consideration.
Sources of noise Noise comes from three sources: vibrating machine parts and surfaces, high-speed moving fluids, and other functional components.
The parts and surfaces of machines that are subject to vibration are often affected by the unsteady forces inside the machine, the rotating parts cannot be in absolute equilibrium, the bearing surfaces are not absolutely stable, gears and belt drives cannot transmit power seamlessly, and in addition, fluctuations occur. The electric field also causes corresponding changes in the motor, transformer and winding.
Noise and air noise can also be generated when air and water flow at high speeds. The machines that produce the most noise are often machines that produce noise from functional components (rather than defective components). For example, machines that generate impact can hardly cause noise in such machines. Because the function of such machines determines that they inevitably produce noise.
The volume of noise produced by a particular type of machine is related to: location and length of use of the machine, location of the operator, distance to other machines or noise sources, structure of the building and ground, installation of the machine, area and height of the workshop . The results of a survey of the printing company's noise volume indicate that some types of machines exceed the specified maximum noise limit, especially when several units of the same type are installed together or when the space is narrow, resulting in greater noise. Some production processes, due to their inherent properties, produce very high noise, such as web folding knives and their brackets, folding indentation rollers, and some noise from gears, bearings, and vents.
The noise generated by the drum groove and the screed roller stopper increases the noise level of the printing press. Factors that increase the noise volume include feeder airflow, blowers, air pumps, and anti-stick dirty spray devices. Platform presses produce more noise than rotary presses because the heavy components that move back and forth on the platform press have to be rapidly accelerated and decelerated repeatedly.
The folding machine in the binding plant inevitably produces noise because the rollers and the paper that is in high-speed contact with metal parts are noise sources. The noise generated by the folder can exceed 90 dB when several folding machines are installed close together. Noise generated...
Noise control measures Noise control itself is an application technique that reduces the noise volume and achieves an ideal working environment. The control of noise is to reduce interference in the work environment and eliminate various factors that degrade hearing. There are three basic methods for reducing noise, namely, reducing noise from the noise source, controlling the sound field to reduce noise at the receiving end, and acoustically processing the room to reduce reflected sound waves.
In theory, the above three methods can be used simultaneously, or only one of them can be used to control the noise. Controlling noise from the noise source is to reduce the mechanical vibration that generates noise. Controlling machine noise is a very complicated issue. It involves many mechanical vibrations of noise. Controlling machine noise is a very complicated issue involving the application of many special noise control technologies. In general, this is something machine builders should do.
Controlling the noise propagation path between the machine and the operator is a measure that many companies can take. It requires the use of closed or quarantine measures and sound absorption treatment of the ceiling and wall so that the noise can neither directly nor indirectly affect the operator. , Separating the various vibration sources helps to prevent the propagation of vibrations, and enclosure measures help to eliminate noise radiation from the noise source. Absorption processing eliminates acoustic reflections from the inner walls and surfaces, greatly reducing the room back. (To be continued)
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