"How does a cardboard shredder work?" sounds like a simple question, but the answer depends on which kind of machine you mean, because there are two different mechanisms and they produce two different materials. Understanding the difference before you buy saves a lot of frustration later.
Start with the basic idea. A cardboard shredder is equipment that turns used corrugated boxes into cushioning packaging material. That much is shared. What changes is what happens inside the machine. In one design, rotating shafts fitted with blades cut a regular pattern into the cardboard, letting the material stretch and expand into a three-dimensional structure. That output is mesh, sometimes called honeycomb or net-cut. It absorbs impact and fills voids in the box. In the other design, a rotating shaft with hardened blades cuts the cardboard into parallel strips of fixed width. That output is strip-cut material, which is cleaner and more compact, and it is used for wrapping, separating, and basic void fill.
The mesh mechanism is worth understanding because it is not simply shredding. The blades perforate the board in a pattern, and because corrugated cardboard has a fluted layer between two liners, the cut board can be pulled open into a lattice. That lattice is thicker than the original board, which is where the cushioning comes from. A strip-cut machine does not do this. It only makes straight cuts, so the cardboard keeps its original thickness but comes out in uniform, controllable widths.
Now the part that matters for buyers: neither mechanism works well unless the cutter shaft is built for the load. Corrugated cardboard is thicker and harder than office paper, and an ordinary paper shredder cannot handle it. The thickness and structure put too much stress on the motor and blades, raising the risk of breakdown. Dedicated cardboard shredders use reinforced cutter shafts, hardened blades, and high-torque motors to cut, perforate, or expand cardboard without jamming or overheating.
This is where machine quality separates. Most peers on the market use 45# steel cutter shafts. Aircosan uses 40Cr. Both materials need quenching and hardening to reach the required hardness, so the difference is not raw hardness. It is brittleness and impact resistance. 40Cr has lower brittleness and stronger resistance to cutting impact, and its machining time is more than twice that of 45#. Machining costs go up, but in return, blade breakage is essentially solved. Aircosan shafts are also large, one-piece units rather than thin blades, designed for a service life of over five years and processed through lathe machining, high-frequency treatment, quenching, blackening, and multiple other steps.
Width is the other engineering constraint. The wider the shaft, the more complex the forces acting on it, and deformation becomes a real problem rather than a theoretical one. Producing shafts above 500mm is a genuine technical barrier. Aircosan produces 550mm desktop shafts stably, and floor-standing models reach 900mm and 1200mm. At present, essentially no peer on the market produces equipment this wide, which is one reason Aircosan is a manufacturer with its own parts processing factory rather than an assembler.
What comes out of the machine is ready to use. No secondary handling, no fluffing, no second pass. The process is continuous mechanical work, with material generated on demand to match the packing rhythm. There is no need to pre-produce a large stockpile. Safety is built in too: emergency stop buttons, enclosed cutting areas, and controlled feeding mechanisms let the machine run safely even in a busy packing environment. Overload protection automatically cuts power and stops the machine when a jam occurs, protecting the motor. Many machines lack this, and a jam can burn out a motor while the shaft is stopped.
Cardboard compatibility follows consistent rules. Most machines handle standard corrugated cardboard, including single-wall and some double-wall. Clean, dry cardboard cuts and expands best. Light tape and labels are acceptable, but staples, metal inserts, and reinforcing materials must be removed first. Material that is too wet, heavily contaminated, or laminated hurts performance and wears the blades faster.
The output has a range of uses. Mesh is generally used as filler to prevent items shifting during transport. Strip material can wrap products or be placed between items as separation. Some models support both outputs, which is more flexible for workstations with varied packaging content. The P50-X uses two sets of cutter shafts to produce mesh and strips simultaneously. The P50-3 shreds a 550mm board into three equal pieces in one pass, with customizable cut width and quantity.
So the short answer is this: a cardboard shredder cuts corrugated board and either expands it into a three-dimensional mesh or cuts it into uniform strips, depending on the mechanism. What determines whether it works reliably for years is the cutter shaft, the material, and the machining behind it. That is the part buyers cannot see in a product photo, and it is the part that decides whether the machine is still running smoothly in year three.