Aerosols from extruder systems, pelletisers, tempering furnaces etc.

Exhaustion and filtration of aerosols at extrusion plants, granulation plants, annealing furnaces and others

Produktion von Kunststoffgranulaten: Absaugung und Filterung von Aerosolen an Extruderanlagen

In the production of plastic granulates at granulation plants or at the coating/lamination of papers and cardboard packaging materials it is unavoidable that harmful substances are released into the ambient air. Water vapour for example, does typically pull harmful materials and particles with it when cooling down the melting product. At the granulation, aerosols are produced that carry along finest solids. In the same way, pollutant-containing steams (aerosols) are released when laminating plastics with a heat of up to 300°C.

“To simply leave” this pollutant-containing air inside the hall is no solution as this leads to the soiling of production lines that must be cleaned expensively, to soiling at the product, that means to a deterioration in quality and to increased wear and tear at the product building itself.

Without doubt, this air is detrimental to the employees’ health, as well. Considering the environmental regulations, such as the German clean air regulation TA-Luft etc., today, the unfiltered discharge of exhaust air is also no adequate solution (soiling of appurtenant structures and plugging of the piping and contaminating the environment).

 

UAS pursues the following approaches in order to solve your extraction air issues.

1. Extraction at the site of formation
In older extraction plans, there was a tendency to use large spanning hoods which required a high performance of the ventilator with a high energy cost.
With their engineers and in close cooperation with the customer, UAS is developing individual suction hoods that are used directly at the site of formation. Thus, a considerably lower ventilator performance is necessary. The result is an adjusted extraction performance and the guarantee that no condensate can drip back onto the product.

2. Electrostatic filtration
is the solution for high separation performance at a relatively low amount of investment and low costs of maintenance. A filter medium that can be adjusted to special requirements.

  • For air masses between 300 and 40,000m3/h and for the separation of:
  • particles (dusts, “smoke“)
  • aerosols consisting of paraffine, stearates, PU, softener, water drops with pollutants and others
  • hydrocarbons in the forms of droplets
  • partially also odour, if the odour molecules are attached to the droplets

The principle of function:

After passing a preliminary filter (separating rough particles), pollutant-loaded exhaust air arrives in the ioniser. There, the remaining small pollutant particles and aerosols are charged positively by means of an electrostatic field. The field is available on a continuous basis and the particles accept the charge within hundredths of seconds. The charged particles settle on the grounded plates of the collector and the cleaned air is discharged.
Using the electrostatic principle, separation performances of 96 - 99% are reached, even smallest particles (0,01µm) are collected.

In this system, the collector plates or also “separation plates” are formed in such a way that the separated aerosols or oily components drain towards the collecting basin and thus the filter cleans itself to a large extent. A kind of “Backwashing” or “Bypass-Flow“ is not necessary.

Conclusion:

UAS is your system supplier when it comes to exhaustion, filtration, engineering and plant construction; be it a complete solution or considering already existing plant parts.

Examples of use

  • Exhaustion of extrusion plants:
  • Coating of packaging
  • Exhaustions at granulation plants when processing:
    • Acrylnitrile-butadiene-styrene (ABS for example Novodur), polycarbonate (PC for example Makrolon or byblend (ABS + PC) ) to:
      • Water ring pelletizer (WRG)
      • underwater pelletizer (UG)
    • Example: Continuous casting head
  • Exhaustion of annealing furnaces:
  • exhaustion of furnaces or over the door of the annealing furnace

APC filter system

An example of an exhaustion and filtration system for temperature-dependent pollutants. (Solidifying point dependent)

Our services available to you

  • Engineering
  • Construction planning
  • Installation including extraction air piping
  • Commissioning
  • Employee training
  • Service
    cleaning - maintaining – repairing

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