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EPS Compacting - Expanded Poly Styrofoam

EPS is perhaps best known under other brand names – such as Styrofoam – and is used for a wide number of applications such as e.g. insulation and product protection during transportation.

Historically, the RUNI Screw Compactor was originally developed to compact EPS boxes for the fishing industry where especially salmon manufacturers receive large amounts of boxes at their production facilities.

EPS is not biodegradable and when not compressed it often ends in landfill where the light, but expansive material creates significant problems. In compacted form, EPS can however be sold on to producers of recycled plastic.

Different kinds of EPS

EPS comes in many different qualities depending on the application and manufacturer. Density, fire retardants and the shape of the material together determine the RUNI solution we will recommend.

Density

We have seen EPS with a density from 10 grams per litre up to 100 grams per litre. Most types are between 20-35 grams per litre. The density particularly affects the compactor’s capacity per hour and whether a pre-crusher with larger motor as accessory is required.

The shape of the material

RUNI continues to develop several solutions to meet demands for the different sizes and shapes of EPS material. Through dialogue with our costumers on the flow of the scrap EPS, we are constantly enhancing the possibilities of handling different types of EPS-products.

Fire retardants

There are some types of EPS that contain different types of fire retardants, particularly in the electronics industry. Fire retardants increase the risk of the material melting during the process. RUNI has developed several solutions to remedy this risk.

No added heat

Heat is required to make the compacted block stick together. But in contrast to other manufacturers of EPS compactors, RUNI does not add heat to the process. The EPS material creates the required heat itself through friction. RUNI produces some of the most energy-efficient compactors on the market.

Volume

The total amount of EPS and the materials flow are significant for the choice of compactor and accessories required.

RUNI SK120 has a capacity of about 18 kg per hour and is typically fed manually.
RUNI SK240 has a capacity of about 75 kg per hour and we recommend an annual volume of up to 50 tons of EPS.
RUNI SK370 has a capacity of about 200 kg per hour and is recommended for annual EPS volumes of 50 tons or more.

A number of different hoppers, pre-crushers and sensors are available for SK240 and SK370 to optimize work processes and adapt the solution to the required application.

The machine can be placed at the end of a conveyer belt or in other way be fitted to the intern flow in the facility.