Meaning
The total financial aggregation of every expenditure incurred from the procurement of raw polymer pellets through to the delivery of the finished injection moulded component identifies the landed cost per part model. This calculation includes resin base price, additives, transport fees, import duties, and variable production overheads. It establishes the fiscal baseline for profitability by accounting for hidden logistics expenses that remain distinct from the direct manufacturing cycle.
The scope of this accounting framework stops at the point of receipt by the customer or the transfer into final warehouse inventory.
Resin Economics
Polymer sourcing choices dictate the primary variables within the landed cost per part model. High melt flow index resins reduce cycle times but increase the per unit spend due to higher additive costs for stabilisers. Virgin material typically carries a premium price yet ensures lower reject rates during high speed moulding runs.
Regrind usage lowers the base material bill but introduces inconsistencies in viscosity that force a reduction in press speed to maintain tolerance. Process variables such as cavitation count and cooling time determine the throughput that amortises these combined material and transit costs.
Procurement Logistics
Global supply chains generate transit burdens that frequently outweigh the initial resin purchase price within the landed cost per part model. Freight insurance, customs clearance fees, and port handling charges accumulate based on weight and volume metrics. Shipping delays create inventory carrying costs that accrue interest on capital tied up in slow moving containerised cargo.
Efficient procurement managers mitigate these variables by grouping shipments to achieve economies of scale during transit.
Production Variance
Moulding performance inconsistencies directly shift the actual value captured by the landed cost per part model. Tooling efficiency determines the number of good parts produced per hour versus the quantity of scrap material generated during setup. Machine downtime for maintenance or mould repair forces a reallocation of fixed costs across a smaller volume of sellable parts.
Consistent monitoring of these downtime intervals reveals that the true cost of production frequently exceeds the initial estimate provided by the datasheet values. Stable processing parameters ensure that the final unit cost remains predictable throughout the duration of a production run.