Meaning
Financial penalties assessed by ocean carriers against cargo owners for retaining shipping containers beyond the allotted free time outside port terminals represent a direct variable charge in resin supply logistics. Polymer converters incur container detention cost when raw material shipments experience unloading delays at receiving docks or prolonged storage in factory yards. The charge structure begins immediately upon the expiration of agreed free days and accumulates daily until the emptied equipment returns to the designated ocean depot.
Material managers monitor these fees to prevent logistics surcharges from inflating resin landed costs.
Free Allocation
Shipping contracts grant a fixed window of free days for unloading ocean freight upon arrival at destination yards. Exceeding this window triggers container detention cost assessments calculated on a progressive daily rate schedule. Logistics planners negotiate extended free time to accommodate custom clearance delays or factory receiving bottlenecks.
Demurrage Contrast
Terminal storage fees charged while containers remain inside port gates differ from charges incurred after gate removal. While port demurrage accrues inside maritime terminals, container detention cost applies once the container leaves the port and remains at the importer facility. Disentangling these charges allows procurement teams to assign accountability across freight forwarders and internal plant operations.
Inventory Absorption
Surcharges from delayed container turnarounds directly increase the unit cost of imported plastic resins. Unplanned container detention cost reduces margins on low-margin resin grades like commodity polyolefins. Tracking container movement through automated logistics software prevents uncoordinated deliveries from overwhelming factory discharge capacity.
