Category Archives: Technology

EPE Foam Shredder

EPE foam shredder reduces the volume of EPE foam and saves transportation costs. EPE foam shredder is a good way of processing EPE foam.

EPE foam shredder

EPE Foam Shredder

Foam Flakes

Watch How Harden EPE Foam Shredder Works?


How to recycle PU foam?

Recently more and more people are looking for the solutions to recycle PU or TPU foam.

There are two types of PU foam in the market, one is sponge foam, other other is a cured foam or like rigid polyurethane foam sheet which is called TPU foam.

Sponge foam is too much memory. Hot melt is too smelly. Cold compaction won’t work as too much memory. But TPU cured foam which is rigid and brittle in nature. Our polyurethane foam compactor CU250, CU300 and CU360 would be a good machine to densify this kind of material. Using our foam compactor will help you save the transportation and landfill costs.

Polyurethane Foam Compactor

Polyurethane Foam Compactor

Features of Polyurethane Foam Compactor

* Compacted PU foam blocks by ratio of 16:1 to 20:1;

* Achieves the capacity in the range of 200 kg/h to 500 kg/h;

* Equip with a pre-crusher;

* Cooling device so as to avoid polyurethane foam melting;

* Nitrogen filling mouth. Dilution of flammable gas inside, meanwhile dissipation of heat;

* Two exhaust ports. To exhaust flammable gas, which will hinder the PU foam forming;

* Customization for options of different feeding length, width.

Choosing between Foam Compactor and Foam Shredder!

It is broadly believed that EPS (expanded polystyrene) foam waste is an unsafe, un-recyclable material. However, that is just a myth. Composed of 98% air and only 2% plastic, it is a recyclable material, which can be re-prepared, reshaped many a times.

Being an easily melting component, EPS can be melted, restructured, redesigned.

For the recycling of EPS foam, often seen with the packaging of delicate electronic goods, different types of machines – as foam shredder and foam compactor – are used.

If you are establishing a recycling plant for EPS waste management, which of these machines you would be arriving at?

Pore over the following passages that assist you on determining the right selection over this bafflement –

The purpose: There are two regular methods of EPS recycling – grinding and compressing. The compactor, as the name goes, compresses or compacts the foam into logs, that represent a great deal of convenience when it comes storing and transporting them. While the multi or single shaft shredder cuts the used foam in small sizes or beads.

Shredding – The expanded polystyrene foam can be used directly into the shredder machine. The appliance will cut and grind it into tiny beads. It is only the half-way process of recycling. It implies that the EPS is now ready for further recycling processes. However, these minuscule foam beads are also of a great use. Toy manufacturers and logistics companies purchase them to meet their product designing and packaging motives. These beads are also methodized in bean bags, cushions, etc.

Compacting – In a compactor machine, the small beads and pieces of scrap EPS are compressed into logs of different sizes and shapes, which are used for various industrial objectives. These machines come in different capacities, tonnage, and log size options. So, after the shredding and compression, EPS is re-melted and turned into lightweight logs, which are sent for reuse to different industries and small, mid and large size verticals.

Different machines are employed for these two foam recycling procedures. It doesn’t matter which machine you choose for recycling the scrap, it is important to get your machine from a reliable EPS waste recycling equipment manufacturer. For example, Runi, Harden, Hasswell. It ensures your plant’s productivity, efficiency, and additionally, cost-effectiveness.

Foam Recycling

Did you know that your foam trash can be turned into picture frames and surfboards? Recycled foam #6 is used to make a variety of everyday items, and recycling it is easy – once the foam products are collected, they are compacted into dense bricks and then converted into pellets that can be used to make new products. Visit to learn more about foam recycling and to find a recycling location near you. While you’re there, get inspired by stories from citizens who are committed to saving the planet, one recycled foam cup at a time!

Recycling foam is easy with programs like Dart Container’s CARE (Cups Are REcyclable) and Recycla-Pak. Whether you are a small business, a large corporation, a school, or an individual, Dart provides a convenient way of recycling, which protects the environment by reducing greenhouses gasses and landfill use. Recycling benefits you and your business by saving you money and stabilizing the economy. Some schools have experienced 20-40% savings on material collection fees.

CARE (Cups Are REcyclable)

Dart’s CARE program provides users with foam cup recycling collection devices. In order to make foam recycling cost-effective there are two key requirements:

  1. Separation of foam products from other non-foam products.
  2. Maximum consolidation of the collected foam cup products into the least amount of space.

The foam collected is then sent to the CARE program’s densifier. The densifier can compress 8,000 eight-ounce foam cups into a cylinder 15” tall and 15” diameter.

The densifier is designed specifically to break down the cellular structure of polystyrene foam through mechanical pressure. The densifer reduces the volume of loose foam products significantly, saving storage and transport space. The densifier is ideal for high-volume cafeterias, restaurants, or other food service operations using foam products.


The Dart Recycla-Pak program is a convenient and a cost-effective way for any size business to recycle foam cups. It’s simple – all you need to do is purchase a specially designed Recycla-Pak corrugated collection bin and you can start recycling foam cups right away.

The Recycla-Pak collection bin doubles as the shipping carton used to return the collected cups for recycling at a Dart or industry recycling facility. The bins are divided to keep the collected cups neatly stacked. The idea is to maximize the number of cups that will fit into the bin as well as discourage users from depositing anything but their used foam cups.RCP1

Polyurethane Foam Recycling Processes

Like other plastics, many polyurethane products can be recycled in various ways to remove them from the waste stream and to recapture the value inherent in the material. Most consumers are familiar with recycling plastic bottles and containers at curbside. Polyurethane recycling, on the other hand, usually happens elsewhere—on job sites, in industrial settings, during building demolition—and takes many forms, from relatively simple reuse to breaking down the material into its chemical constituents.

Polyurethane is recycled in two primary ways: mechanical recycling, in which the material is reused in its polymer form, and chemical recycling that takes the material back to its various chemical constituents.

Mechanical Recycling

  • Rebonded Flexible Foam—Rebonded flexible foam or “rebond” is made with pieces of chopped flexible polyurethane foam and a binder to create carpet underlay, sports mats, cushioning and similar products. Rebond has been used for decades and represents nearly 90 percent of the carpet underlay market in the United States.
  • Regrind or Powdering—Sometimes called powdering, regrind recycling takes polyurethane industrial trim or post-consumer parts and grinds them in various ways to produce a fine powder. The resultant powder is mixed with virgin materials to create new polyurethane foam or reaction injection molded (RIM) parts.
  • Adhesive Pressing/Particle Bonding—These two recycling processes use polyurethane from various applications, such as automobile parts, refrigerators and industrial trim, to create boards and moldings, often with very high recycled content. Used polyurethane parts are granulated and blended either with a powerful binder or polyurethane systems, then formed into boards or moldings under heat and pressure. The resulting products, analogous to particleboard made from wood waste, are used in sound proofing applications, furniture that is virtually impervious to water and flooring where elasticity is needed.
  • Compression Molding—This recycling process grinds reaction injection molded (RIM) and reinforced RIM parts into fine particles and then applies high pressure and heat in a mold, creating products with up to 100 percent recycled content and material properties that can be superior to virgin materials.

Chemical Recycling

  • Glycolysis—This process combines mixed industrial and post-consumer polyurethanes with diols at high heat, causing a chemical reaction that creates new polyols, a raw material used to make polyurethanes. These polyols can retain the properties and functionality of the original polyols and can be used in myriad applications.
  • Hydrolysis—This process creates a reaction between used polyurethanes and water, resulting in polyols and various intermediate chemicals. The polyols can be used as fuel and the intermediates as raw materials for polyurethane.
  • Pyrolysis—This process breaks down polyurethanes under an oxygen free environment to create gas and oils.
  • Hydrogenation—Similar to pyrolysis, hydrogenation creates gas and oil from used polyurethanes through a combination of heat and pressure and hydrogen.

Flexible Polyurethane Foam

Polyurethane Foam Recycling is Viable

The opportunity to generate additional revenues while eliminating costly waste removal has caught the attention of many home furnishings manufacturers, foam fabricators, carpet installers and other converts of flexible polyurethane foam. An easy product to recycle, flexible polyurethane foam scrap is now generating revenue for many end-users. The flexible polyurethane foam industry has made great strides in technology and end-use applications to address waste problems. By providing a “snapshot” of the opportunities for recycling in 1994, this bulletin is intended to assist manufacturers, production engineers, distributors, retailers, carpet installers, and others in the position to recover flexible polyurethane scrap. The following information examines the economic and environmental value of recovering and reusing scrap foam, with information on how your scrap can be used to generate revenue, offset raw material cost, and alleviate solid waste deposal problems. Continue reading

Polyurethane Foam Compactor for Compacting Refrigerators Foam

Application of Polyurethane Foam Compactor

Polyurethane foam compactor is mainly used in electric appliances recycling center that has tons of rigid PU foam from dissembled refrigerators. Another source of rigid PU foam is teared down workshops that made of sandwich panels.

Polyurethane Foam Compactor

Polyurethane Foam Compactor

How the Polyurethane Foam Compactor Works

Operator throws PU scraps into the machine hopper. The pre-breaker breaks the foam blocks into smaller flakes. An auger compactor presses the foam into compacted logs. Operator stacks the logs onto pallets.

Features of Polyurethane Foam Compactor

* Compacted PU foam blocks by ratio of 16:1 to 20:1;

* Achieves the capacity in the range of 200 kg/h to 500 kg/h;

* Equip with a pre-crusher;

* Cooling device so as to avoid polyurethane foam melting;

* Nitrogen filling mouth. Dilution of flammable gas inside, meanwhile dissipation of heat;

* Two exhaust ports. To exhaust flammable gas, which will hinder the PU foam forming;

* Customization for options of different feeding length, width.

Technical Specifications of Polyurethane Foam Compactor

Motor   power kw 11+2.2+1.5
Compaction   ratio 20:1
Capacity   kg/h 200-500
Feed   hopper size mm 296*296
Out feed   size mm 300*300
Machine size   mm 1950 (L)*800(W)*1780(H)
Machine weight   kg 800




How Foam Density is Rated

All Foam is not Created Equal

Density, measured in pounds per cubic foot,  is the key property for determining flexible foam performance.

The firmness of the foam does not determine its quality, price or durability.
Density relates to the comfort, support and durability properties of the foam.
Adding cheaper foam additives or fillers can alter density. Additives are used to make a cushion feel heavier and more luxurious, or to improve the support, but they may have a negative effect on other foam properties, including tear strength, air flow and durability. Continue reading


Why EPS foam a better packaging material than paper?

When choosing packaging materials, the following factors must be taken into consideration: thermal insulation performance, shock absorbing ability and environmental impacts.
The most apparent advantage of EPS foam over the cardboard is that its insulation performance is better. During the same time of 10 minutes, the paper cup losts twice as much heat as that in a foam cup. To protect people’s hand from the hot beverages, the paper cups must be two-layered or use some kind of wrap. Hence, the paper containers are bigger and heavier.
On the other hand, it is reported that, based on the life cycle analysis, the energy consumption and environmental impacts of EPS foam packaging is better than cardboard packaging as is shown in the following pictures.
Comparison of EPS Foam and Cardboard Packagings

Polyurethane Foam Is Recyclable And Provides Environmental Benefits

Foam Is Recyclable And Provides Environmental Benefits Foam is recycled and provides environmental benefits compared to spring mattress units. Many materials are difficult to recycle. Some simply don’t produce a valuable recycled material. Others are difficult to collect and transport. But, flexible polyurethane foam is now being recycled and providing environmental benefits.

Up to 30 percent of all foam can become scrap after cutting and shaping foam in product fabrication. Without recycling this would be a costly disposal problem for foam manufacturers. However, with the development of practical end uses for scrap foam, almost every piece of scrap is recyclable. Continue reading

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