Brief introduction of domestic PET bottle cleaning industry
2024-12-05 03:00:59
PET bottles are one of the most widely used plastic types. The relevant state departments attach great importance to the recycling of PET bottles. They strongly encourage recycling companies to improve their technology, expand their scale, and produce more and better PET recycled products. According to the current situation in China, production networks are scattered, small-scale, and low-tech. It is difficult to form large-scale production in the short-term, and it is difficult to improve the level of technology. Many high-quality bottle sources are processed into inferior bottles, and waste of resources is very high. serious. The following is the status quo of the use of the process, equipment, and cleaning agents used by domestic cleaning companies for reference in the industry.
First, the cleaning process
1, pre-wash
Pre-washing is the process of adding a large amount of clean water after the bottle is crushed or crushed to remove easily stains such as sediment. At present, 90% of small-scale processing plants do not have a pre-washing process, which results in poor quality of bottle tablets and a large amount of waste of cleaning agents, which increases product cost and chemical contamination, and is a serious mistake. The prewash process in a large washing plant is also unreasonable and does not achieve the effect of prewashing.
The pre-washing process of a large-scale washing factory is generally: crusher - small hoist - rinse tank - dryer. The equipment is complicated, inefficient, and does not reach the pre-wash effect.
The simplest and most effective way of pre-washing is: crusher (adding a lot of water) - drum washer - dryer. Simple and easy to clean, the effect is very good. Except for a portion of the oil stains and label paper adhesives, the other stains were almost completely cleaned. It laid a good foundation for the next drug wash.
2, drug wash
The process of drug wash is mainly to remove oil stains that cannot be removed from pre-washing, label paper adhesives, etc. The common method is hot alkali wash, the concentration of fire alkali is about 4-10%, temperature 95-98 degrees. The process flow is: Hoist - hot wash tank (with hoist), many small plants hot wash tank is very small, the material stays in the tank is too short, simply wash is not clean, no way to use increased alkali The amount used to make up for, caused a lot of waste and pollution, the final product came out of the wash is not clean, yellow, can only be sold at low prices, the good raw materials made of defective.
According to the requirements of the large-scale washing plant, the retention time of the material in the hot wash tank can not be less than 30 minutes, and the temperature can not be lower than 95 degrees. Otherwise, the oil stain and the label paper adhesive will not be clean, and the quality of the bottle sheet cannot be guaranteed.
3, rinse
The rinsing process has two functions. One is to float floating material, and the other is to wash away the adhesive agent attached to the bottle to ensure the quality of the bottle. Process flow: barrel washing machine (or rinsing tank) - 2-3 rinsing tank - dryer - fan. The quality of the rinsing effect is very much related to the first two processes. The first two processes do not work well, and the rinsing is no better than high-quality products.
The current washing plant, rinsing process can do, but because the first two processes but pass, it is still difficult to wash good bottle tablets, especially for some small washing plant, is simply suffering.
Second, cleaning equipment
1, small and simple equipment
Crusher - medicine wash tank - washing cylinder - 2-3 rinsing - dryer. Without pre-washing, the capacity of the medicine wash tank is very small and the soil stove is heated.
At present, 90% of small washing plants use this equipment, which is inefficient, of poor quality, and of high pollution.
Hebei Shunping, Shandong Laizhou, Hebei Wen'an, Henan Gongyi and so on all have factories to produce such equipment, and the price is between 20,000 and 30,000 yuan.
2, medium-sized equipment
Crusher - medicine wash tank (with stirring, steam heating) - wash barrel - 2-3 rinse tank - dryer.
This equipment to clean the bottle tablets, chemical fiber factory to do polyester staple fiber can be used directly on the machine, some small washing plant has begun to replace this equipment. The disadvantages are: there is no pre-wash, waste of alkali is wasted, pollution is great, and product quality is poor.
Hebei Shunping, Laizhou, Shandong, Gongyi, Henan, and Ziyang, Sichuan all have such equipment manufacturers. The price is approximately between 8-10 thousand yuan.
3, large-scale equipment
Crusher - hoist - rinsing tank - dryer - hoist - rinsing tank - hot wash tank - rinse tank - 2-3 rinse tank - dryer - fan.
This is currently the best cleaning line in China, with a high degree of automation and good product quality. Generally large chemical fiber plants use this type of cleaning equipment. The disadvantages are: pre-washing effect is not good, after the drug wash without a dryer, a large amount of fire alkali, increase pollution, increase the difficulty of rinsing.
Zhangjiagang, Jiangsu has such equipment manufacturers, the price of about 30-60 million.
Third, cleaning agent
Cleaning agent is one of the key technologies for cleaning bottle tablets. At present, the high-temperature cleaning agents used by more than 99% of manufacturers are fire alkali, and there are no better alternatives to fire alkali. There are several foreign companies that have introduced cryogenic cleaners that have worked well. However, due to the high cost, there are not many manufacturers.
Some manufacturers use fire alkali, trisodium, pentasodium and other self-made cleaning agents, but also not achieve the desired results.
The above-mentioned situation regarding equipment, processes and cleaning agents is the result of the investigation conducted by Beijing Hui Jiaxiang in the past year. Where there are omissions, please also seek understanding from friends in the industry.
In recent months, Wuhan has introduced a small-scale ultrasonic cleaning machine with a high voice. There are customers who have used to consult Huijiaxiang in Beijing. After inspection, this equipment has certain strengths, but if it is used in the factory, it is still a little defective. First, the power consumption is too high for the average factory to bear. Second, the cleaning agent it uses cannot be recycled. If capable manufacturers can reconstruct these two defects, this machine can be regarded as a set of good cleaning equipment.
First, the cleaning process
1, pre-wash
Pre-washing is the process of adding a large amount of clean water after the bottle is crushed or crushed to remove easily stains such as sediment. At present, 90% of small-scale processing plants do not have a pre-washing process, which results in poor quality of bottle tablets and a large amount of waste of cleaning agents, which increases product cost and chemical contamination, and is a serious mistake. The prewash process in a large washing plant is also unreasonable and does not achieve the effect of prewashing.
The pre-washing process of a large-scale washing factory is generally: crusher - small hoist - rinse tank - dryer. The equipment is complicated, inefficient, and does not reach the pre-wash effect.
The simplest and most effective way of pre-washing is: crusher (adding a lot of water) - drum washer - dryer. Simple and easy to clean, the effect is very good. Except for a portion of the oil stains and label paper adhesives, the other stains were almost completely cleaned. It laid a good foundation for the next drug wash.
2, drug wash
The process of drug wash is mainly to remove oil stains that cannot be removed from pre-washing, label paper adhesives, etc. The common method is hot alkali wash, the concentration of fire alkali is about 4-10%, temperature 95-98 degrees. The process flow is: Hoist - hot wash tank (with hoist), many small plants hot wash tank is very small, the material stays in the tank is too short, simply wash is not clean, no way to use increased alkali The amount used to make up for, caused a lot of waste and pollution, the final product came out of the wash is not clean, yellow, can only be sold at low prices, the good raw materials made of defective.
According to the requirements of the large-scale washing plant, the retention time of the material in the hot wash tank can not be less than 30 minutes, and the temperature can not be lower than 95 degrees. Otherwise, the oil stain and the label paper adhesive will not be clean, and the quality of the bottle sheet cannot be guaranteed.
3, rinse
The rinsing process has two functions. One is to float floating material, and the other is to wash away the adhesive agent attached to the bottle to ensure the quality of the bottle. Process flow: barrel washing machine (or rinsing tank) - 2-3 rinsing tank - dryer - fan. The quality of the rinsing effect is very much related to the first two processes. The first two processes do not work well, and the rinsing is no better than high-quality products.
The current washing plant, rinsing process can do, but because the first two processes but pass, it is still difficult to wash good bottle tablets, especially for some small washing plant, is simply suffering.
Second, cleaning equipment
1, small and simple equipment
Crusher - medicine wash tank - washing cylinder - 2-3 rinsing - dryer. Without pre-washing, the capacity of the medicine wash tank is very small and the soil stove is heated.
At present, 90% of small washing plants use this equipment, which is inefficient, of poor quality, and of high pollution.
Hebei Shunping, Shandong Laizhou, Hebei Wen'an, Henan Gongyi and so on all have factories to produce such equipment, and the price is between 20,000 and 30,000 yuan.
2, medium-sized equipment
Crusher - medicine wash tank (with stirring, steam heating) - wash barrel - 2-3 rinse tank - dryer.
This equipment to clean the bottle tablets, chemical fiber factory to do polyester staple fiber can be used directly on the machine, some small washing plant has begun to replace this equipment. The disadvantages are: there is no pre-wash, waste of alkali is wasted, pollution is great, and product quality is poor.
Hebei Shunping, Laizhou, Shandong, Gongyi, Henan, and Ziyang, Sichuan all have such equipment manufacturers. The price is approximately between 8-10 thousand yuan.
3, large-scale equipment
Crusher - hoist - rinsing tank - dryer - hoist - rinsing tank - hot wash tank - rinse tank - 2-3 rinse tank - dryer - fan.
This is currently the best cleaning line in China, with a high degree of automation and good product quality. Generally large chemical fiber plants use this type of cleaning equipment. The disadvantages are: pre-washing effect is not good, after the drug wash without a dryer, a large amount of fire alkali, increase pollution, increase the difficulty of rinsing.
Zhangjiagang, Jiangsu has such equipment manufacturers, the price of about 30-60 million.
Third, cleaning agent
Cleaning agent is one of the key technologies for cleaning bottle tablets. At present, the high-temperature cleaning agents used by more than 99% of manufacturers are fire alkali, and there are no better alternatives to fire alkali. There are several foreign companies that have introduced cryogenic cleaners that have worked well. However, due to the high cost, there are not many manufacturers.
Some manufacturers use fire alkali, trisodium, pentasodium and other self-made cleaning agents, but also not achieve the desired results.
The above-mentioned situation regarding equipment, processes and cleaning agents is the result of the investigation conducted by Beijing Hui Jiaxiang in the past year. Where there are omissions, please also seek understanding from friends in the industry.
In recent months, Wuhan has introduced a small-scale ultrasonic cleaning machine with a high voice. There are customers who have used to consult Huijiaxiang in Beijing. After inspection, this equipment has certain strengths, but if it is used in the factory, it is still a little defective. First, the power consumption is too high for the average factory to bear. Second, the cleaning agent it uses cannot be recycled. If capable manufacturers can reconstruct these two defects, this machine can be regarded as a set of good cleaning equipment.
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