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Process principle analysis of PET plastic cleaning equipment
1. The simplest process flow of PET plastic cleaning equipment
According to the requirements of the cleaning principle, in order to wash out the material on the staple fiber factory, the simplest equipment configuration can be reduced to 8 pieces. The specific configuration is as follows: friction cleaning machine-drying machine-spiral main washing machine-drying machine- Ordinary rinsing machine - ordinary rinsing machine - ordinary rinsing machine - drying machine. This configuration requires the use of a bottle that is de-labeled, otherwise the cap and label paper are not clean. In addition, because there is no hoist control material, it is a little troublesome to manually control the material during feeding, but the cleaning effect is very good, and it can wash out the first-grade material required by the staple fiber factory.
2. Equipment transformation plan
At present, domestic small-scale washing plants basically use the following equipment configuration: hoist-mixing tank-lifting machine-friction cleaning machine-general rinsing machine-general rinsing machine-general rinsing machine-drying machine, also 8 pieces of equipment However, the effect and the above configuration are far worse, it is difficult to wash out the machine. If the equipment is removed from the mixing tank and the rear hoist, adding a main belt washer and two dryers, and then changing the position of the friction washer, it is a good assembly line. The adjusted configuration is as follows: hoisting machine - friction washing machine - drying machine - main belt washing machine - drying machine - ordinary rinsing machine - ordinary rinsing machine - ordinary rinsing machine - drying machine, this is 9 pieces of equipment. On the basis of the original assembly line, it only needs to increase the investment of 30,000-50,000 yuan, and the power of 10kw can upgrade the product to a higher level and increase profits.
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3, equipment selection
Pre-washing equipment: The simplest and most effective pre-washing equipment is a friction cleaning machine. This machine can effectively remove most of the sediment and other attachments, and the effect is very good. At the same time, it is simple to use and low in price. It is a pre-washing equipment for small washing plants. Good choice. The general pre-washing part configuration is: hoist - friction washer - dryer. If the label and the lid are not cleaned, it is best to configure a floating separator. The pre-washed bottle is already very clean and will pass the main washing process smoothly. Therefore, the better configuration is: hoist - friction washer - float separator - dryer.
Main washing equipment: In order to meet the technical requirements of the main washing process, there are two ways to wash out the machine.
(1) Lifting machine - two mixing tanks (hot cleaning tank) - two lifting machines - drying machine, six sets of equipment. This is a traditional configuration method, which is cumbersome and consumes a lot of power.
(2) Main belt washing machine - drying machine, two equipment. This is a configuration using the new equipment main belt washer, which is simple in equipment, low in power consumption and excellent in effect. The two configurations have the same requirements for cleaning agent and heating. Different types of cleaning agents and different heating systems can be selected.
Rinsing equipment: The main equipment for rinsing is: friction washing machine, ribbon rinsing machine and ordinary rinsing machine. Three devices can be used together, or only two or one can be selected. There are three ways to configure the effect.
(1) Ribbon rinsing machine - ordinary rinsing machine - ordinary rinsing machine;
(2) Friction cleaning machine - ordinary rinsing machine - ordinary rinsing machine
(3) Ordinary rinsing machine - ordinary rinsing machine - ordinary rinsing machine. The first configuration can wash out the material on the filament factory, and the second and third configurations can wash out the material on the staple fiber plant. Because the main washing equipment is equipped with a dryer, the rinsing equipment can be configured so easily and easily, otherwise it is necessary to increase the equipment by two-thirds or one times to achieve the same effect.
4, cleaning principle
The cleaning principle of the bottle is the same as the principle of washing clothes. Three processes are also required: pre-washing, main washing and rinsing.
Pre-washing is to remove the easy-to-remove attachments such as sand on the bottle and remove the largest amount of impurities in the simplest way. Without this process, a large amount of impurities on the flakes enter the main wash process, which has two undesirable effects. First, these impurities will consume a large amount of cleaning agent, resulting in waste; second, these impurities will quickly thicken the cleaning agent, affecting the cleaning effect, and even make the cleaning agent unusable.
The main wash is to remove the hard stains such as oil and glue on the bottle. This part of the stain is small, but the process requirements are relatively high. According to the traditional process requirements, the bottle must be stirred in a 90-98 ° C aqueous solution of caustic soda for more than 30 minutes to achieve the effect. The use of caustic soda as a cleaning agent is a condition that must be guaranteed, otherwise the machine will not be washed out. With the new cleaning agent, the temperature conditions can be appropriately relaxed, and the mixing or washing time can never be changed, otherwise it is difficult to achieve the desired effect.
Rinsing is the removal of stains and cleaning agents that have been adhered to the bottle by the cleaning agent. This process is also important. Rinsing the unclean bottle will turn yellow after baking.
Any cleaning line must have three processes: pre-washing, main washing and rinsing. Each process must achieve the desired effect to wash out the good bottle. It must be wrung three times when washing clothes. The process of washing the tablets should also be dehydrated by three passes. That is to say, a complete assembly line must have three dryers. This configuration meets the low-cost and efficient design principles.