Circular Pathway
Industrial recovery processes ensure that spent materials are collected and processed to return to the same production stream without downgrade. When paperboard converters employ closed loop recycling, they collect clean post-industrial trimmings and route them straight back to the pulper of the board mill that supplied the original reels. This operation maintains the long-fibre strength of the pulp because it avoids the contamination and the severe refining associated with general curbside collection.
The process operates under strict quality controls to prevent any deterioration of the board physical properties.
Yield Recovery
Mill operators rely on this direct return of board scraps to preserve both fibre length and chemistry. The segregation of waste at the converting plant prevents adhesive tapes and synthetic coatings from entering the repulping stream. This clean supply of material reduces the chemical consumption in the stock preparation department.
Boundary Limit
Mechanical limitations apply to the process when the cellulose fibre undergoes multiple rewetting cycles. The physical strength of the board degrades after several cycles, which requires the introduction of virgin softwood pulp to maintain the required burst strength. In most mills, a small amount of fresh material is added to keep the paperboard strength stable.
