Green Cleaning: environmentally friendly cleaning solutions for laser filters in the recycling industry

SCHWING Technologies focuses on green technologies - for 50 years

Circular Economy is one of the top topics at this year's K 2019. Plastics and environmental protection, recovery and recycling are the buzzwords here. The recycling industry is showing how new materials can be obtained from using recycled waste materials, like high-quality polyethylene-based polymers (PE). Mainly light packaging waste is used: packaging plastics and commercial mixed films. Recyclable "waste" is a raw material source that works, provided the product quality is satisfactory. Fine laser filters are used in the industry to ensure precise filtration. They are essential in the production process for high-quality and sustainable recycling. Cleaning and reuse can reduce production costs, helping to protect the environment.

Gentle cleaning results through thermal plastic removal
In order to maintain the desired quality, regular cleaning processes are necessary. In around six hours, the MAXICLEAN thermal pyrolysis system from SCHWING Technologies removes all plastic residues at 450 degrees Celsius. This without mechanically or thermally impairing the laser filter and in just one operation. The cleaning process, which can be precisely controlled and reproduced at any time, takes place in an externally gas-heated cleaning chamber. A special hot air duct ensures that the temperature is distributed optimally and evenly.

The system also monitors the carbonization gas development and ensures a short cleaning time. Laser filters are then cleaned by a two-hour post-treatment with high-pressure water. They are then placed into an ultrasonic bath before being rinsed, dried and treated for corrosion.

Alternatively, SCHWING recommends a treatment of around nine hours in the VACUCLEAN vacuum pyrolysis system. The fully automatic cleaning process takes place in an electrically heated vacuum cleaning chamber. The System measures the temperature directly on the part to be cleaned, which is initially heated slowly and gently. Most of the adhering plastic melts off and flows out. The remaining plastic is then decomposed at around 440 to 450 degrees Celsius. Finally Carbon is removed by slowly adding air (controlled oxidation). A sophisticated sensor system controls this cleaning process, so excessive temperatures do not occur at any time. Here, too, inorganic residues can be easily removed during post-treatment (e.g. by compressed air).

Environmental protection since 1969
For 50 years, SCHWING Technologies has considered environmental protection as a top priority in the plastics industry with its environmentally friendly and energy-efficient systems for the thermal removal of plastics, such as laser filters. Since its foundation in 1969, environmental awareness and energy optimization have been a focus of the German equipment manufacturer's machinery and cleaning solutions. With its green technologies, the company is an internationally successful specialist for thermal cleaning. The expert offers reliable and cost-reducing systems, as well as sustainable and gentle solutions for all machine parts and tooling of various plastic production industries.


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Fine laser filter before cleaning
Fine laser filter after cleaning
In around six hours, the MAXICLEAN thermal cleaning system from SCHWING Technologies removes all plastic residues at 450 degrees Celsius