broke

Broke is damaged, off-spec, or rejected paper and board that is collected during production and sent back into the pulping system rather than discarded. It includes trim waste from sheeting operations, broke rolls from the reel, sheet rejects from quality checks, and any paper that fails to meet customer specifications. Because it is already fibrous material, broke can be rehydrated and mixed back into the pulp slurry, avoiding the cost of disposal and recovering some fiber value.

The volume of broke varies sharply by mill type and product. A newsprint mill running at high speed might generate 3 to 8 percent broke; a fine paper machine producing demanding grades can reach 10 to 15 percent or higher if quality standards are strict. Tissue mills typically run lower broke rates because the product is consumable and rejections are caught earlier. Containerboard and kraft mills also track broke carefully because it directly affects yield and profitability.

Handling and processing broke

Broke must be managed immediately to prevent fiber delamination, sizing loss, or contamination. It is either baled at the machine, sent to a broke beater (a secondary pulper that rehydrates and breaks down the paper), or fed directly into the stuff box ahead of the forming section. The key constraint is moisture: dry broke resists rehydration and requires more energy to disintegrate; damp broke is easier to process but risks mold growth if stored. Mills typically recycle broke back into the same grade or into a lower-value product.

Problems arise when broke contains contaminants: staples, tape, plastic trim, or hardened sizing can jam equipment or damage fiber structure. Some mills screen broke or use a hydrocyclone to remove sand and grit. Broke from coating operations presents another challenge because the coating layer adds mineral and binder that must either be accepted in the new sheet or removed chemically, which is expensive and rarely done.

The term broke derives from the state of the paper, not from a mechanism; it is simply broken or rejected material. In mill parlance, 'fresh broke' means waste from the current run, while 'stored broke' has been baled and may have sat for days or weeks. Some mills distinguish between 'soft broke' (loose trim) and 'hard broke' (wound rolls or reels that must be de-wound and processed). Broke rate is a key performance metric tracked daily; elevated broke signals machine instability, quality drift, or operator error and triggers investigation.