A jam is the most common complaint about a cardboard shredder, and it is also the most misunderstood. When the machine stops, the operator assumes the machine is at fault. The operator checks the shaft, the die, and the motor, and often finds nothing wrong. The real cause is usually somewhere else — in the material, the feed technique, or the environment around the machine. Finding the real cause takes a different kind of investigation, and it starts with the assumption that the machine is working as designed.
The first place to look is the material. Cardboard is not a uniform product. A carton that has absorbed moisture cuts differently from a dry carton. A carton with a heavy coating cuts differently from an uncoated carton. A carton that has been crushed or creased cuts differently from a flat one. The operator should examine the cartons that were fed before the jam. If they were damp, the cause is the storage. If they were coated, the cause is the supplier's packaging. If they were crushed, the cause is the handling before the machine.
The second place is the feed technique. Operators who are new to the machine tend to feed too fast, because they are trying to keep up with the packing line. Feeding too fast forces the material into the cutting area before the blade is ready, which causes the material to fold rather than cut. The fold becomes a jam. The solution is not to slow the machine but to slow the feed, and the operator learns the right pace by watching the output rather than the input.
The third place is the foreign material. Staples, tape, and plastic film are the most common causes of jams, and they are also the easiest to remove. The operator should check the carton before feeding it. A quick visual check takes seconds, and it prevents the jams that take minutes to clear.
The fourth place is the environment. A machine placed near a doorway collects dust and moisture from the outside air. A machine placed near a heat source dries out the cardboard, which makes it brittle. A machine placed in a humid area absorbs moisture, which makes the cardboard soft. The environment affects how the material behaves, and the material affects how the machine performs. The machine should be placed in a stable environment, away from doors, heat sources, and moisture.
The fifth place is the paper. Paper that is too thick or too damp behaves differently from paper that is within specification. Suitable paper is generally ≤80gsm, with a paper roll length of about 1700m and a maximum unwind diameter of 500mm. The operator should check the paper before loading it, and the paper should be stored in a dry area.
The sixth place is the die. A worn die does not cut cleanly, which means the material has to be forced through. That force causes jams. Die life is generally 1.0 to 1.3 million meters depending on material and usage. The operator should track the meters and replace the die before it wears out.
The seventh place is the machine itself, but only after the other causes have been ruled out. Aircosan machines use overload protection — when a jam occurs, the machine automatically cuts power and stops, protecting the motor. That protection is designed to prevent damage, and it works as intended. If the machine is jamming frequently, the cause is usually upstream of the machine, not inside it. Aircosan shafts are 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. The material is 40Cr rather than ordinary 45# steel. 40Cr has lower brittleness and stronger impact resistance, and its machining time is more than twice that of 45#. A stable shaft does not cause jams. It cuts what is fed into it. Aircosan machines have side sheet metal that fits tightly with no gaps, so paper dust cannot enter the gears and cause abnormal noise or long-term wear. Aircosan machines use one-button start, a pressure gauge that shows status clearly, and a panel that groups the controls in the order they are used. Aircosan runs its own parts processing factory, controlling part quality in-house rather than assembling from mixed outside sources. The company supports logo customization from one piece and color customization from ten pieces. Products carry CE, ROHS, and UKCA certifications and hold an exclusive EU patent. After-sales responds within 12 hours and connects customers directly with engineers.
For an operator, the practical approach is to check the material, slow the feed, remove the foreign material, control the environment, check the paper, track the die, and only then look at the machine. That sequence finds the real cause and fixes it, rather than clearing the same jam again next week.