The machines that turn used boxes into void fill look similar in photographs and differ substantially inside. Buyers who compare specifications alone tend to discover the difference after delivery, when the machine either keeps up with the packing line or becomes the thing slowing it down.
The first thing to check is width. Measure the boxes that arrive over a two-week period rather than assuming standard sizes, because incoming packaging varies by supplier and product type. If a large share exceeds the machine's working width, every box needs preparation before feeding, and that preparation is labour that recurs daily. Typical widths run from 350mm on bench units up to 1200mm on the widest floor-standing models. The right width matches the material, not the largest available.
The second thing is thickness capacity. Single-wall corrugated board is a few millimetres thick. Double-wall and triple-wall board, common for heavier products, is thicker. Bench units handle up to around 10mm. Mid-range floor-standing models handle 15mm. The wider models handle 20mm and process board that arrives as double or triple-wall without separating sheets first. A machine that jams on the standard material interrupts the packing line rather than supporting it.
The third thing is what comes out. Strips are dense and uniform and stay where they are placed, which suits void fill for light goods where the concern is movement rather than impact, and they work for wrapping and separating items in the same box. Mesh expands into a three-dimensional structure that absorbs impact and conforms around irregular shapes, which suits fragile items and products that are not rectangular. Some machines produce both, selected by the operator, which covers a mixed product range without requiring two purchases.
The fourth thing is power configuration. Bench units run on standard 110V or 220V. Some floor-standing models support single-phase and three-phase. The widest units are 380V three-phase only, and a site without three-phase cannot install those without electrical work. Confirming supply before comparing specifications avoids the situation where the machine arrives and the power does not.
The fifth thing is what happens inside the machine, and this is where most of the price difference between suppliers sits. Two units with the same width and thickness rating can differ substantially in shaft size, motor quality, and construction tolerances. Aircosan shafts are large one-piece units machined from 40Cr steel rather than the more common 45#, and are processed through lathe work, high-frequency treatment, quenching, and blackening, designed for a service life beyond five years. At the same 550mm working width, Aircosan shafts are larger and thicker than peers, with roughly 30% more material cost. The clearest indicator of shaft size is overall machine weight at a given width, and a heavier machine at the same width almost always means a more substantial shaft.
Overload protection is worth asking about directly. A jam on a corrugated machine is a mechanical event rather than an inconvenience, and a machine without overload protection continues driving a stalled shaft, which risks burning out the motor and creates downtime that costs more than the price difference.
Material preparation is the part most operations underestimate. Standard corrugated cardboard is suitable, including single-wall and some double-wall. Clean, dry cardboard works best because it expands evenly and keeps structural strength after processing. Light tape and labels are acceptable. Staples, metal inserts, and reinforcing materials should be removed before feeding, because they damage cutting components. Damp or heavily contaminated cardboard cuts poorly and wears the components faster.
Maintenance access is the last practical consideration. Blades dull over time, and a dull blade produces uneven output, which affects protection quality. Checking blades on a regular schedule and replacing them when needed keeps the machine running at specification, and spares should be available from the supplier rather than ordered case by case.
Where the machine sits matters too. In most operations it belongs near the packing area, where the material is used and where the boxes arrive. Producing on demand at the pace of the line removes the storage and reordering cycle that comes with purchased void fill. The space that held pallets of material becomes available for something else, and in a warehouse that space has a direct operational value.