Waste gas cleaning in plastic printing industry - Bluer Medio Ambiente, S.L.U.

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Waste gas cleaning in plastic printing industry


Always faithful to our philosophy of installing “turnkey” plants, we offer to the plastic printing industry (flexography and rotogravure) a complete solution to clean the gases emitted from the printers.

These gases are characterized by having high flow rates with low concentrations of organic pollutants (typically, around 800 mg/Nm³ of T.O.C.). The organic pollutants contained in the waste gas are usually ethyl acetate, ethyl alcohol, isopropyl alcohol and 1-methoxy-2-propanol. Therefore, the most suitable treatment equipment is a thermoreactor.

To minimize energy consumption, we perform a recirculation of part of the gases that emerge from the process. With this, we achieve the following objectives:

  • The total flow of the gases to be cleaned is reduced, so the equipment that is needed is smaller, and the initial inversion is also reduced.

  • The concentration of organic pollutants is increased until the autothermal limit is reached in the thermoreactor that will clean the gases (around 2 g/Nm³ of T.O.C.). In this way, no heat energy is needed to carry out the cleaning.

  • Part of the air that enters the printing machines is already hot, reducing the energy consumption necessary for the drying of the inks. This energy saving allows to recover part of the initial investment.

This recirculation can be done on the machine itself (when it allows it) or through a plenum. The gas emissions of all printer machines of a plant can go to the same plenum, which reduces the investment and simplifies the necessary control instrumentation.

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