Noise Control in Printing and Packaging Enterprises (II)

Prior to the development or installation of noisy machines, other measures must be taken to reduce the impact of noise on employees. There are several measures that can be taken, such as replacing or renovating noise-generating components, covering the noise with a sound-damping hood, improving the installation status and installation environment of the machine, and providing employees with personal ear protection products. What kind of measures should be taken depends on the specific issue.
Replacement or modification of noise-producing parts Replacement or modification of machine parts often reduces noise. The noise generated by old machines was particularly high, and their renovation would reduce the noise by 15 decibels. It would also be possible to install gaskets on parts that hit one another and weaken the air whistling sound. Where circumstances permit, plastic or bakelite gears may be used instead of metal gears, and belts may be used instead of metal chains.
Vibrations propagated in the machine can cause rapid vibrations to the outside (for example, the machine housing), thus creating noise. If the machine housing is lighter, using a damping material to increase its weight can turn loud noise into a less harsh, low-pitched sound. Damping materials include adhesives or epoxy resins that can be sprayed on the vibrating site and plastic sheets that can be cut to a certain size and then pasted. The above materials should be used to increase the weight of the vibration site, which is expected to reduce noise by 3 dB.
If the vibrating part is relatively heavy, it can be fixed with a flexible fixing member, and sometimes a thick elastic washer is used to compress the thickness by a third or two thirds.
Closing the noise source It is one of the commonly used methods to enclose noise-generating machine parts with sound-absorbing materials. Noise-generating parts should be surrounded as completely as possible by a rigid structure (usually steel) and the inner surface should be covered with a sound-absorbing material (glass fiber, felt or cork). The large enclosed structure used on the webfolder is usually made of plywood, with a fire-resistant surface, and a sound-absorbing lining on the damping plate. Interstitial plates (marketed) with several layers of plywood or steel plates, foamed materials, lead plates, thin plastics or drawn steel meshes are sometimes used. The effectiveness of this method depends on how much material is left for transportation. Openings used by the operator to adjust the machine. The 5% opening makes the noise attenuate 15dB of large paper; 10% of the opening makes the noise attenuate 10% of the large paper. When a particular part (such as a motor or an air compressor) produces noise, the above method can be used.
Sometimes the operator and the control panel can be housed in a large, sound-proof enclosure, and the operator is equipped with ear protectors to facilitate the operator to leave the enclosure to adjust the machine. This method is very effective when the noise is significantly greater than 90 dB.
Some of the noise that affects the human body to improve machine installations comes directly from machinery and equipment, and partly from noise reflected from walls, floors, and ceilings. The degree of noise reflection depends on the area of ​​the room and the characteristics of the four-walled surface. Tiles, cement and other hard surfaces reflect noise, while wood, certain plastics and flexible materials absorb noise and reduce noise by 5 dB. Ceiling trims and fiber finishes are not very suitable for use in the pressroom because paper dust and ink mist will plug the holes in the material. It is best to use fiberboard with a cleanable perforated metal surface. Use urethane foam with a washable plastic surface.
Most materials are suitable for absorbing high-frequency noise. If you want to absorb low frequency noise, use thicker materials. If there is a 3 to 4 inch gap between the sound absorbing material and the wall or ceiling, thicker material may not be necessary. The sound-absorbing material should extend 8 feet high from the ground because the noise is reflected at the height of the operator's ear.
Providing Personal Attendant Products Doing so effectively protects individuals from excessive noise interference, but it should not be considered as a long-term measure to reduce machine noise.
The development of a noise control plan to formulate a noise plan has not yet received enough attention. Reasonably failing to count the factory buildings and coordinating various production processes are important contents in noise control planning. Dealing with noise during the planning stage will virtually eliminate the pressure of controlling noise in other ways. The noise control plan is divided into three parts: selection of low-noise process equipment, plant layout, and preparation for noise control work in advance. In many cases, the most effective results can be achieved by controlling noise in advance. The layout of the factory is the most important, both inside and outside the kitchen. The noise level of the entire equipment can be predicted using the noise data provided by the manufacturer. The following factors should be taken into consideration: the installation location, volume, kitchen area and other ancillary facilities of the equipment.
During the planning phase, the volume of the indoor noise of complex equipment can be evaluated. Based on this, the noise level of the equipment and the effect of changes in the plant layout can be evaluated. The noise level of most types of machinery and equipment depends on the installation method and operation method. Controlling noise through maintenance may be the second aspect that has not received enough attention. Actual investigation shows that the most common reason for generating a large amount of noise is due to equipment maintenance and repair not being in place. All machine equipment emits less noise when maintenance is in place. Printers should strive to obtain an environmentally friendly printing production environment through investment planning.
First, we must grasp the facts, determine the noise area and the noise-generating machinery and equipment, and then take appropriate measures to achieve the desired results at the appropriate cost. Early treatment can reduce noise and save costs. Although the actual effect of improving the production environment of the workshop cannot be directly analyzed quantitatively, there is ample evidence that the noise control measures will help improve productivity. When planning the layout structure of a new plant, if noise issues need to be taken into consideration, factors such as the installation location of the machinery and equipment and the construction of the plant will have a significant influence on the budget and project costs of noise control. Certain noise problems that have been foreseen during the planning and installation phase can often be resolved without any cost. On the other hand, remedial measures for current problems often require a lot of money. Managers should raise their awareness of noise control; employees must also have the skills to deal with noise problems, buy or rent noise measuring instruments, and some issues require investing in experts to provide professional advice.
Although the ultimate solution to noise problems depends to a large extent on the efforts of machine equipment manufacturers, printers should also explicitly raise noise volume when purchasing machinery and equipment, prompting manufacturers to take appropriate effective measures. As long as the above-mentioned various countermeasures are used to solve the noise problem, printers can make their own enterprises achieve higher productivity and greater economic benefits. (Finish)

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