Material
Recovered Paper Fibre
Answer in brief
Recovered paper does not behave as a bulk solid at all; it behaves as a tangled mat.
Fibres and sheet fragments interlock, bridge across wide openings and wrap around anything that rotates.
- Use mechanical handling with generous clearances rather than gravity chutes.
- Remove plastics, metal and wire early, before they reach a rotating part.
- Treat dry fibre and paper dust as a fire and explosion risk.
Reviewed October 21, 2026 · Updated October 21, 2026
Handling challenges
Paper mills using recovered fibre spend their maintenance budget on blockages and on the things that arrive with the paper.
Interlocking and wrapping
Long fibres and sheet fragments bridge openings and wrap around shafts, screws and rollers.
- Generous cross sections and no converging corners.
- Shaft protection and anti-wrap design on every rotating element.
- Access for clearing that does not require entering the equipment.
Contamination
Plastics, wire, staples, glass and the occasional unexpected item arrive with every bale.
Magnets, eddy current separators and screening protect the pulper and the downstream equipment, and their reliability determines how often the line stops.
Fire and dust
Dry fibre and paper dust are combustible, and baled storage has a well-documented fire history.
Spark detection before filters, dust collection with explosion protection and controlled storage block sizes are the usual measures.
Moisture
Wet bales are heavy, form plugs in conveyors and support biological heating in storage.
What to establish before buying equipment
- Bale size, density and the opening method.
- Contamination profile of the supply stream.
- Moisture range on receipt.
- Fire detection and dust protection strategy for storage and handling.
Material behavior
- Flowability
- Very poor; interlocking mat behavior
- Abrasiveness
- Low, but grit and staples raise wear
- Cohesiveness
- Mechanical entanglement rather than cohesion
- Moisture behavior
- Wet fibre forms heavy plugs and promotes biological heating
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