Parent Sheet Web Trim Allocation and Machine Deckle Yield Optimization
Web trim allocation optimizes machine deckle fill through dynamic linear programming, reducing edge slitting broke to lower landed packaging substrate costs.
Trim Waste Optimization
Recovery Metric
Mathematical calculation determines the most efficient arrangement of slit widths on a primary reel to minimize the amount of discarded fiber. Performing trim waste optimization requires the use of linear programming or specialized algorithms to solve the cutting stock problem. This process is a fundamental part of paper mill management because it directly impacts both the environmental footprint and the profitability of a production run.
Operational Calculation
Planners input the required widths and quantities of customer rolls into a system that compares them against the available machine deckle. Through trim waste optimization, the software identifies combinations that fill the width of the machine with the smallest possible side trim. The resulting waste, known as shavings or trim, is usually vacuumed away and returned to the wet end of the process to be recycled into new paper.
This calculation must also account for the time required to change knife positions or the logistical costs of managing different roll diameters. Efficient planning reduces the frequency of knife changes and improves the overall throughput of the winder.
Financial Performance
Minimizing the percentage of material that is reprocessed rather than sold increases the total yield of the facility. Trim waste optimization ensures that the energy used in the initial pulping and drying stages is not wasted on unsaleable material.