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“I just took over an aging shredder. How do I determine if I need a new rotor and how much life is left in it?”

Good question! First, compare the original condition to the current condition. Try to find the rotor arrangement drawing, which came with the shredder when it was new or when the replacement rotor was purchased. This drawing should show disk thickness and key dimensions.

✔️ Check that the tie rods are still holding the rotor tightly together
Measure the outside-outside end disk distance across the rotor. If it’s growing an inch or more, the spread can mean loose or broken tie rods or loose or missing end disk nuts. A loose rotor will have limited life.

✔️ Look at rotor disk thickness and edge wear
Monitor the disks diameter indirectly, by tracking the distance between hammer pin hole and edge of the disk.

✔️ Monitor disk thickness and “wash out” around the hammer swinging area about the pin hole.

✔️ Check bearing bolts for tightness and bearing housings for damage
Clean up debris and keep bearing areas clear.

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We have a Hagglunds Marathon MA283 drive motor available for sale.  The rebuilt unit is packed and in storage.

Domestic consumption of copper currently stands at 1.5 million metric tons per year. U.S. mining accounted for 1.3 million tons.

Old (post-consumer) scrap, converted to refined metal, alloys, and other forms, provided an estimated 160,000 tons of copper in 2022, and an estimated 670,000 tons of copper was recovered from new (manufacturing) scrap derived from fabricating operations.

“Of the total copper recovered from scrap, brass and wire-rod mills accounted for approximately 85%; smelters, refiners, and ingot makers, 10%; and chemical plants, foundries, and miscellaneous manufacturers, 5%. Copper recovered from scrap contributed 32% of the U.S. copper supply. (Source for all data: USGS – see link below).

Although the U.S. has enough copper reserves and resources to meet current demand, geopolitical and logistical risks can disrupt copper supply – for example, a disruption to a key route, such as the Panama Canal, could wreak havoc. Currently, the U.S. imports 44% of its refined copper, according to Recycling Today.

As discussed in “Spotlight on Copper,” a 2023 ISRI (now ReMA) moderated panel discussion, in order to meet copper demand, the U.S. must retain its copper scrap versus exporting it. (See our 2023 write up of the discussion.)

That was then, this is now. According to projections in an August 2024 S&P Global report, U.S. copper demand is expected to more than double – to 3.5 million metric tons – by 2035. This demand represents a 112% increase or a compounded annual growth rate of 6.5%.

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Infrared Camera Side Mount on Scrap Metal Shredder Feed Chute — a K2 Castings project.

To ensure the best possible throughput, your shredder operator needs the best possible view of the material entering the shredder. It’s why you’ll often see shredder control cabs mounted to a tower; the set up allows the operator to peer into the infeed and get the last possible glimpse of the feedstock before it enters the shredder.

The view from this point of entry allows your operator to adjust the feed to keep the shredder operating right in the sweet spot. Too slow of a feed and you’re giving up productivity, too fast and you risk jams and incomplete shredding.

It’s tempting to place your operator’s chair as close to the mouth of the shredder as possible, and while this position gives the operator the most direct view, one can achieve just as much, if not more, with cameras.

When properly located, a camera can give your operator a near direct view down the throat of your shredder. Additionally, close-up views of the output can give him the information he needs to produce the highest quality shred, as well as knowing when the hammers need replacement.

Not only that, but FLIR cameras, properly utilized, can give your operator a view through the steam produced in a shredder with water injection, while also giving him an intuitive sense for the temperature of the machinery, without the need to be staring at dials.

Additional reading on the K2 blog: Infrared Camera Positions for Shredder Infeed.

Operations at a recycling facility can be extremely tough on your assets. Heavy truck and equipment traffic, crowded facilities, dust, water, and debris take a toll on all the machinery on site.

Particularly at the entrances and exits of buildings, it takes only one unwary operator to cause significant damage to both the building and the equipment.

While the answer to damage at a scrap yard is often “armor it up,” when it comes to overhead doors, the answer, unintuitively enough, may be to seek a softer material, such as rubber.

Steel roll up doors have their advantages, but they’re better suited to locations where impact risk is low. Any significant impact to a steel slatted door from vehicles or machinery is likely to bend the slats past the point of repair.

A customer who uses steel doors on their site, for example, was disappointed to learn that only two months after the installation, a door was damaged beyond repair and required replacement of the entire door curtain. They have since switched to rubber doors at many locations.

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Sub-standard scrap poses significant risk to your shredder, people, the surrounding environment — and your entire business. One explosion due to a compressed tank could mean months of closure — or business bankruptcy and closure.

In this blog post, I’ll cover the materials that can wreak havoc with your inbound stream, as well as causing minor to major issues — from a clogged system or broken parts to increased costs and environmental hazards.

Heavy or dense raw material

“Heavies” are raw materials that are simply too heavy in size and density/mass and therefore can’t be easily shredded. Heavies inevitably damage internal components of your shredder, including castings such as hammers and pins, and material handling systems.

Damage from heavies can cause prolonged periods of downtime and safety risks to operations personnel when replacing damaged components.

Damaged wear part (upper left) due to “heavies.”

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Excessive moisture in your shredding process is an ongoing challenge. Lessening the amount of moisture can have a significant improvement on your bottom line, especially during weather-related inclement months.

Excessive moisture can cause the following issues:

Excessive oxidation
Poor scrap quality of FE (ferrous) and NF (non-ferrous) is mostly associated with excessive oxidation of the finished product, and represents yield loss for the end consumer.

Most domestic FE and NF scrap is consumed within the period when it’s transferred from the processer to the end consumer – generally within 30 days or less.

When this material is shipped internationally via export container or bulk vessel, however, the travel time from processor to end consumer is increased by an average of one (1) to two (2) months – causing a lot more oxidation to take place and yield loss for the consumer.

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Readers of this blog know we’re advocates for regular shredder maintenance. In the July/August issue of Metals Recycling, Ken McEntee interviews several people in the industry about this very topic.

In his well-researched piece, “Wear Parts Awareness,” McEntee discusses what are wear parts, product improvements over the last 15 or so years, and why inspection and maintenance are essential. He also covers buying wear parts (know your vendor!) as well as last year’s tariff exclusion on shredder parts from China.

But, back to shredder maintenance. As quoted in McEntee’s piece, shredder operators run wear parts as long as possible — which reduces shredder efficiencies and profitability.

My advice that I share with readers: “set your benchmarks for shred density, metals recovery rates and ferrous tons per hour. Schedule your maintenance to stay within those limits.”

You can find the July/August issue at the Metals Recycling website. You can also subscribe to print issue, which is free!

ISRI 2023 featured a moderated panel discussion, “Spotlight on Copper.” Panelists included John Gross, John E. Gross Consulting, and publisher of The Copper Journal; David Schilberg, Metal Buyer, Prime Materials Recovery; and Matt Bedingfield, President of Recycling, Wieland N.A. Recycling.

John Gross led the discussion with a presentation of detailed charts. The U.S. is seeing a resurgence in copper recycling – as well as secondary smelting facilities being built.

Global competition for copper will increase, with China indicating that they plan on increasing their import of the material. According to Gross’ data, China is the scrap market. China imports 32% of the world’s scrap – while the U.S. exports 18%.

Figure 1: © The Copper Journal

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Global manufacturers have set ambitious targets for using recycled materials to meet sustainability goals. According to Boston Consulting Group, Coca-Cola wants to use 50% recycled material in its packaging by 2030; General Motors wants to increase its share of sustainable materials to 50% or more this decade. (Source)

For a company like Coca-Cola, using recycled aluminum for its beverage cans makes sense: the material requires about 5% of the energy needed to produce new aluminum, plus aluminum can be recycled infinitely.

Nespresso is another company using recycled aluminum to meet sustainability goals.

Nespresso Coffee Capsules: 80% recycled aluminum

© Nespresso

Nespresso, a B-Corp owned by Nestlé, has always focused on reducing waste and reusing product materials.

In 1991, the company created a recycling program that allowed its customers to return used coffee capsules – either to a Nespresso store or by mailing them in – versus tossing them in the trash. (In fact, the current coffee machines have mechanisms that eject the used capsules into a built-in holding container.)

In 2020, Nespresso announced the launch of its first coffee capsules made using 80% aluminum. Today, the entire coffee line incorporates recycled aluminum, and the company’s recycling efforts include 100,000 collection points worldwide for the capsules.

In addition, the company is the co-founder of the Aluminum Stewardship Initiative, which is focused on the “responsible production, sourcing, and stewardship in the global aluminum value chain.” (Source)

To learn more about the company and its environmental commitment, visit: https://nestle-nespresso.com

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