When purchasing a recycling machine, the focus is often on the manufacturer, features, and purchase price. However, proper sizing is at least as important. A machine with insufficient capacity can become a bottleneck in operations. An oversized system, on the other hand, may result in unnecessarily high investment and operating costs.
Whether it's a shredder, baler, alligator shear, cable granulator, or other recycling equipment: The required throughput should always be tailored to the actual volume of material and the overall processing workflow.
In simple terms, throughput describes the amount of material a machine can process within a given period of time. It is often expressed in kilograms or metric tons per hour, for example.
However, a high theoretical throughput does not automatically mean that the machine is the best choice for every operation.
The key is the interplay between:
• Material type
• Material quantity
• Material size
• Desired end product
• Operating hours
• Upstream and downstream machines
• Available workforce
• Existing infrastructure
Only by taking these factors into account can the actual power requirements be realistically estimated.
Before making a purchase, you should first determine exactly how much material will actually be processed.
However, it is not enough to look solely at the average daily value. Recycling facilities often experience fluctuations in material intake.
Therefore, the key questions are:
• How many metric tons are generated daily or weekly?
• Are there seasonal fluctuations?
• How many hours a day should the machine run?
• Are there plans to increase material quantities in the future?
• What materials will be used?
It may be wise to allow for a certain amount of capacity buffer. However, the system should not be designed to be significantly larger solely because of potential future peaks.
The specified machine capacity must always be considered in relation to the material to be processed.
For example, a shredder can achieve vastly different throughput rates depending on the type of material. Material density, size, moisture content, composition, and contaminants significantly affect actual operation.
The same applies to cable granulation systems. Thin cable mixtures present different processing challenges than heavy copper cables.
That is why performance figures should never be considered in isolation.
A recycling machine rarely operates completely independently of other components.
The processing line may include, for example:
• Pre-shredders
• Conveyor belts
• Shredders
• Screening technology
• Magnetic separators
• Sorting systems
• Granulators
• Balers
If a single machine is significantly more powerful than the rest of the process, this does not automatically result in a higher overall throughput.
Here's an example: A high-performance shredder offers little additional benefit if the downstream sorting system cannot handle the volume of material it produces.
Sizing should therefore always take the entire process chain into account.
Initially, using machinery with insufficient power may seem cost-effective because the investment costs are lower.
However, sustained high utilization can lead to disadvantages:
• Longer processing times
• Material residues
• Production bottlenecks
• High machine utilization
• Additional staffing requirements
• Reduced reserves as volumes increase
If the volume of material increases, an additional or larger machine may be needed sooner than planned.
Even an oversized recycling machine can pose economic challenges.
In addition to higher purchase costs, larger machines may, depending on their design, require more energy, necessitate additional infrastructure, and incur higher maintenance or wear-and-tear costs.
In addition, the following must be taken into account:
• Is there enough floor space?
• Is the power connection sufficient?
• Is the conveyor system compatible with the machine?
• Can sufficiently large quantities of material be supplied continuously?
• Is the available capacity actually being used?
The goal, therefore, should not be to choose the largest possible machine, but rather the most cost-effective solution.
The required capacity also influences the decision between a new and a used recycling machine.
On the used equipment market, high-performance machinery may be available that is technically well-suited to the existing material flow and represents a cost-effective alternative to purchasing new equipment.
In addition to throughput, the following factors, among others, are crucial:
• Technical condition
• Operating hours
• Wear and tear
• Maintenance history
• Spare parts availability
• Energy consumption
• Required overhaul work
However, if there are specific requirements, it may make sense to use a new machine that is configured accordingly.
A recycling machine is typically used for several years. Therefore, planning should not be based solely on the current volume of material.
If an increase in volume is foreseeable, it may be advisable to maintain a certain capacity reserve.
However, planning should be realistic. Building a significantly larger facility solely on the basis of potential future growth can tie up capital without creating economic value in the short term.
Ultimately, it is not the maximum throughput in metric tons that determines the purchase decision, but rather the cost-effectiveness of the entire process.
In addition to the purchase price, the following factors should therefore also be considered:
• Energy consumption per metric ton processed
• Labor costs
• Maintenance costs
• Cost of wear parts
• Machine availability
• Achievable material quality
• Actual throughput at the facility
Under certain conditions, a technically smaller machine can operate more cost-effectively than a significantly more powerful system.
Especially when it comes to used recycling machines, it is important to ensure that the machine is precisely matched to its intended application. Manufacturer specifications alone are not always sufficient to assess actual performance under real-world operating conditions.
The type of material, desired throughput, existing technology, and future development of the operation should therefore be considered together.
This helps prevent the purchase of a machine that, while technically capable, is not optimally suited to the existing process.
Proper sizing of a recycling machine is crucial for cost-effective operation. A machine that is too small can cause bottlenecks, while an oversized machine can result in unnecessary investment and operating costs.
The key factors are the type of material, actual volume, operating time, desired throughput, and the existing process chain. Taking these factors into account before making a purchase lays a better foundation for a cost-effective investment in the long term.