Category Archives: Technology

Study on Recycling of styrofoam that We Should Know

Styrofoam (EPS) plastic with low density, high specificity, low water absorption, acid and alkali, good insulation, can be decorated, easy to shape, etc., which makes it a rapid development, and is one of the most widely used plastics in the world today.

Styrofoam applies in the home appliances, office machinery buffer packaging materials, containers and disposable tableware, etc. are used in large quantities as a one-time use of packaging materials, because of light weight, large size, with anti-aging, corrosion and difficult to be biodegradable.However, it dealing with a major problem, causing serious environmental pollution. So recycling of styrofoam is very important.

It is necessary for us to depend on special styrofoam recycling equipment to recycle styrofoam. Styrofoam densifier is the main styrofoam recycling equipment. Harden can manufacture styrofoam densifiers with four models.

Styrofoam Densifier

Styrofoam Densifier

Harden styrofoam densifier uses innovative technology to compress bulky styrofoam waste extremely efficiently into easy to manage, stackable blocks – with no re-expansion. The extreme reduction in volume thus achieved (in the ratio of 50:1) does not only produce a considerable saving in transport and disposal costs, but the blocks produced can be also recycled as raw material, therefore contributing to a rapid amortisation.

Styrofoam Recycling Solution

Why We Need Waste Styrofoam Recycling Line?

Styrofoam contains 95 -98 % of air and 2-5% of  Styrofoam. It is light in weight and difficult to handle. Moreover, you need pay high transportation and disposing costs for landfill.  Styrofoam is 100% recyclable and recycled Styrofoam can it be made into coat hangers, CD/video cassettes, plant pots, picture frame, decoration profile, etc.

Styrofoam Recycling

Styrofoam Recycling Process

At present, the recycling of styrofoam basically follows the following process:

Compaction – Styrofoam products are fed to a compactor in order to reduce its volume. Some compactor systems have a compaction ratio of up to 50:1, which means that it can reduce the volume by up to 98%.

Shredding – Larger pieces are shredded into flakes. Packaging “peanuts” – small styrofoam pieces used to cushion fragile items.

Melting/Extrusion – The flakes are forced through pelletizing extruders where they are heated and melted, then allowed to cool in order to solidify. The resulting material can then be used, through reheating and melting, to produce clothes hangers, picture frames, DVD cases and numerous other plastic products.

1. Trays of styrofoam are
compacted for shipment.

EPS Compactor for EPS recyclingcompacted eps

2. The compaction of styrofoam allows for a reduction by 30-50 times the number of shipments needed to move the material.

transport EPS

3. The compacted blocks of styrofoam are shredded into flakes in preparation for introduction into the pelletizing extruder.

Single Shaft Shredder

4. The shredded flakes of styrofoam are converted back into the polystyrene pellet.

Single Screw Extruder


5. The styrofoam pellets are mixed with additives and color in the compounding pelletizer line and re-pelletized prior to introduction into the profile lines for profile production.

Twin Screw Extruder

There’s No Such thing as a STYROFOAM™ Cup

STYROFOAM™ Brand Foam is a registered trademark of The Dow Chemical Company and has been a valued asset for more than 60 years.

The STYROFOAM™ Brand name is often misused as a generic term for disposable foam products such as coffee cups, coolers and packaging materials. These materials, however, are made from expanded polystyrene (also known as EPS) and do not have the insulation value, compressive strength or moisture-resistant properties of STYROFOAM™ Brand Extruded Polystyrene Foam Insulation.

There isn’t a coffee cup, cooler or packaging material in the world made from actual STYROFOAM™ Brand Extruded Polystyrene Foam Insulation. STYROFOAM™ is a registered trademark of The Dow Chemical Company that represents its branded building material products, including rigid foam and structural insulated sheathing, and more.

Harms from Styrofoam

Styrofoam DensifierStyrofoam is non-biodegradable. According to Washington University, Styrofoam takes 500 years to decompose. With enough Styrofoam cups produced each day to circle the earth if lined up end to end, the potential for major ecological impact is great.

The Earth Resource Foundation reports that Styrofoam manufacturers were the fifth largest producer of toxic waste in 1986. Continue reading

Substitution of Styrofoam Cups

Substitution of Styrofoam Cups | Styrofoam Densifiers for Styrofoam RecyclingThe primary problem with Styrofoam cups is that they do not biodegrade quickly and take up space in landfills. Styrofoam takes a long time to break down in the environment and can accumulate as harmful waste in landfills. Some coffee houses are now selling their coffee and hot beverages in biodegradable cups rather than in Styrofoam. The biodegradable cup does not use a paper jacket like most traditional hot beverage containers, but instead is designed with corrugated cardboard on the interior of the cup to keep the heat inside. Continue reading

What Happens To Trashed Styrofoam?

What Happens to Trashed Styrofoam | Styrofoam DensifierTrashed Styrofoam does not degrade easily, as it is made from non-renewable petroleum products. According to the Environmental Protection Agency, more than 2 million of the 3 million tons of Styrofoam products produced in the United States sit in landfills. Due to the vast amount of Styrofoam filling the landfills, researchers are motivated to explore better disposal solutions for Styrofoam. Continue reading

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