The "green" of printing production is still difficult - the safe disposal of waste products in printing (below)


(It's not easy-Safe Disposal of Printshop Waste Is a Job in ofself)

The cleaning of the printing press and various cleaning solvent products often perform some cleaning work at the end of the printing or other production work, or during production, and can generate a large amount of dirty liquid, which is a common thing in the printing room. Printers use a variety of cleaning solvent products for machine maintenance and body cleaning, as well as a large amount of waste liquid.

To evaluate the cleaning methods used by printing workers, are workers excessively using solvents to clean printer components or blankets? The use of spray cans for spraying cleaning methods can greatly reduce the amount of solvent, compared with the method of cleaning with rags and solvent cleaning.

Also check the method of collecting solvent waste after cleaning. Pouring waste solvents into large buckets containing other wastes will cause all the waste liquids to become harmful products. The rags containing the solvents should be collected and sent to the laundry room instead of thrown away.

The use of centrifugation and recovery devices is still the main method of treating the solvent in the washing waste. Centrifugation throws the solid particles in the waste liquid to the bottom of the bottle or filters it, and the liquid solvent returns to the liquid storage tank. If there is enough solvent in the rag to achieve economic recovery, the centrifuge should also dry the wipes instead of sending the rags to the laundry for cleaning.

Solvent Recovery The distillation unit heats and evaporates the liquid components, and the liquid is fractionated to obtain a reusable solvent.

The distillation waste can be fractionated using a conventional distillation apparatus. In the factory, the recovered solvent can be used for ink. If the line requiring cleaning is very long, it is necessary to use a distillation recovery device. This method can be used for flexo, gravure and screen printing plants.

For lithographers, the cleaning waste from the press and the blanket can also be recycled. The centrifuge can recover some of the solvent. If the centrifuge has a filter, the centrifuge can remove very small particles, but it cannot be removed. Colors and some soluble chemicals.

The difference between using a distillation apparatus and a centrifugal apparatus is the size of the investment and the running cost. The distillation apparatus requires energy to heat the liquid to evaporate to fractionate a clean, almost pure solvent. The centrifugation device removes visible solids. The solution is slightly colored, but it can still clean blankets and printer components.

When cleaning a printer or plate, scrubbing with a rag will inevitably leave a little dirt, which may affect the print quality. Therefore, when the rag is used, the degree of cleanliness should be considered.

Using a washing machine to clean the rags and reuse them is an important environmental measure. The key lies in how the printing workers recover the rags, the cleanliness of the washing machine, and whether it will cause scum. The rag can also be incinerated.

Before the dirty cloth is sent to the laundry device, the solvent should be removed as much as possible, no matter if it is screwed or machine dried. A simple device is squeezed with rollers.

Clear used rags can be collected in a liquid tank to absorb cleaning waste from the press. Waste can also be sent to hazardous wastes for disposal. This is a way of avoiding hazardous waste that can harm the environment.

In the printing press cleaning device, the use of a high boiling point solvent helps to reduce the evaporation loss. Just think of how fast the alcohol or toluene-based cleaning fluid can evaporate. Using a spray can to moisten the missing wash can greatly reduce the amount of solvent used in the cleaning of the printing press and the blanket, and then wipe off the dirt with a rag, so that the wipe does not carry a lot of unnecessary solvent, and then wipe the cloth Send it to the laundry device for washing, and repeatedly use the rag.

In each cleaning solution, the cleaning waste liquid can be recycled by using a centrifugal device or a distillation device so that the solvent can be reused for many times.

Grasping your own destiny Every small part of the waste that comes out of your plant can have a big impact on costs. If you deal with the hazardous waste that is generated in your plant, you may be able to bring a good return. Incurring the disposal of environmental laws and regulations, it also lost some valuable solvents or materials, which is not conducive to the reduction of overall costs.

In the next few years, printers will be more aware of the hazards of waste and take necessary measures to reduce or eliminate unnecessary waste on various materials.

The key to managing harmful waste is to train and educate employees and reduce or eliminate the use of chemicals as much as possible. In addition, finding safer alternatives or other process methods can also be a way to reduce environmental pollution.

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