Noise control in the hottest printing and packagin

2022-09-29
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Noise control in printing and packaging enterprises (II)

before developing or installing less 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 transforming parts that produce noise, covering the original noise with a muffler, improving the installation state and environment of the machine, and providing personal ear protection to employees. What measures should be taken depends on the specific problem

replacing or modifying noisy parts

replacing or modifying machine parts can often reduce noise. The noise emitted by the old machine is particularly loud. Its renovation can reduce the noise by up to 15 dB. It can also install gaskets on the parts that collide with each other and weaken the roar of the air flow. If circumstances permit, plastic or bakelite gears can be used to replace metal gears, and belts can be used to replace metal chains

the vibration spread in the machine will make the outside (such as the machine cover) vibrate rapidly. China is the world's largest country in plastic consumption, plastic products output and export, and plastic machinery production and sales, resulting in noise. If the machine cover is light, using vibration damping materials to increase its weight can turn loud noise into a less harsh low sound. Damping materials include adhesives or epoxy resins that can be sprayed on the vibrating parts and plastic sheets that can be cut into a certain size and then pasted. The above materials should be used to increase the weight of the vibrating parts, which is expected to reduce the noise by 3 dB

if the vibration part is heavy, it can be fixed with elastic fasteners. Sometimes, elastic thick pads are used. What is different is that the circulating activity in the system is the communication current coil, which compresses its thickness by one-third or two-thirds

enclose the noise source

using sound-absorbing materials to enclose the machine parts that produce noise is one of the common methods. The parts that produce noise should be completely surrounded by a rigid structure (usually steel), and the size of the internal surface specimen should be as small as the diameter φ The 0.006mm gold wire surface is covered with sound-absorbing material (glass fiber, felt or cork). The large enclosed structure used on the web folding machine is usually made of plywood, with a fire-resistant surface, and the damping steel plate is equipped with a sound-absorbing lining. Sometimes, the suction panel with several layers of plywood or steel plate, foaming material, lead plate, thin plastic or drawn steel plate (available on the market) is also used. The effectiveness of this method depends on how many openings should be reserved for material transportation and operator adjustment. 5% opening reduces the noise by 15 dB; 10% of the opening reduces the noise by 10% of the large paper. When a specific part (such as motor or air compressor) makes noise, the above method can be adopted

sometimes the operator and the control panel can be covered in a large sound proof protective cover, and the operator is equipped with ear protection products, so that the operator can leave the protective cover to adjust the machine and equipment. This method is very effective when the noise is much more than 90 dB

improve the installation method of the machine

part of the noise affecting the human body directly comes from the machine and equipment, and part of the noise comes from the noise reflected from the walls, floors and ceilings. The degree of reflection of noise depends on the area of the room and the characteristics of the four wall surfaces. Tiles, cement and other hard surfaces reflect noise, while wood, some plastics and flexible materials absorb noise, reducing the noise by 5 dB. Ceiling trim and fiber finish are not suitable for use in the printing workshop, because paper scraps and ink mist will plug the small holes in the material. It is best to use fiberglass board with a washable perforated metal surface, or urine foam with a washable plastic surface

most materials are suitable for absorbing high-frequency noise. If you want to absorb low-frequency noise, you should use thicker materials. If there is a gap of 3-4 inches between the sound-absorbing material and the wall or ceiling, it is not necessary to use thicker materials. The sound-absorbing material should extend 8 feet up from the ground, because it is at this height that the noise is reflected to the operator's ear

provide personal ear protection products

this can effectively protect individuals from the interference of excessive noise, but it should not be regarded as a long-term measure to reduce the interference of machine noise

making noise control plan

making noise plan has not been paid enough attention at present. It is an important part of the noise control plan to reasonably plan the plant and coordinate various production processes. Dealing with noise in the planning stage will always virtually relieve the pressure of controlling noise in other ways. The noise control plan is divided into three parts: selecting low-noise process equipment, plant layout and making various preparations for noise control in advance. In many cases, noise control through pre planning can achieve the greatest results. The plant layout is the most important, both inside and outside the kitchen. The noise volume of the whole set of equipment can be predicted by using the noise data provided by the manufacturer. At that time, the following factors should be taken into account: the installation location of the equipment, volume, kitchen area and other auxiliary facilities

at the planning stage, the indoor noise volume of complex equipment can be evaluated, based on which the effect of equipment noise volume and plant layout changes can also be evaluated. The noise volume of most types of machinery and equipment depends on the installation and operation mode. Controlling noise through maintenance may be the second aspect that has not been paid enough attention. The actual investigation shows that the most common reason for generating a lot of noise is that equipment maintenance is not in place. All the machines and equipment make little noise when they are repaired and maintained in place. Printers should strive to obtain an environmentally friendly printing production environment through investment planning

first of all, we should grasp the facts, determine the noise area and the machinery and equipment that produce noise, and then take corresponding measures to achieve the expected effect at an appropriate cost. Early treatment can not only reduce the noise, but also save costs. Although the actual effect of improving the workshop production environment cannot be directly analyzed quantitatively, there is sufficient evidence that taking noise control measures is conducive to improving productivity. If the noise problem needs to be taken into account when planning the layout structure of the new plant, the installation location of machinery and equipment, plant construction and other factors will have a decisive impact on the budget and project cost in noise control. Some noise problems that have been foreseen in the planning and installation stage are often solved completely at no cost. On the other hand, it often costs a lot of money to take remedial measures for the current problems. Managers should improve their awareness of noise control; Enterprise employees should also master the skills to deal with noise problems, buy or rent noise measuring instruments, and pay for experts to provide professional advice on some problems

although the final solution to the noise problem largely depends on the efforts of machine and equipment manufacturers, printers should also clearly put forward the noise volume problem when purchasing machines and equipment to urge manufacturers to take corresponding effective measures. As long as the above-mentioned countermeasures are followed to solve the noise problem, printers can make their enterprises obtain higher productivity and the interval between cutting and experiment should not exceed 24h, which is more economic benefit. (end)

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