Warehouse Operations Intermediate

Sortation

Also known as: Package Sorting, Sort Process, Parcel Sortation

Definition

Sortation is the process of separating packages, items, or orders based on specific criteria such as destination, carrier, service level, or delivery route. It’s a critical step in both warehouse fulfillment and carrier hub operations.

Types of Sortation

Outbound (Fulfillment)

Sorting picked orders for shipping:

  • By carrier (USPS, UPS, FedEx)
  • By service level (Ground, Express, Priority)
  • By delivery zone
  • By manifest/truck

Inbound (Carrier Hub)

Sorting packages for delivery:

  • By delivery route
  • By driver/vehicle
  • By delivery window
  • By residential vs. commercial

Sortation Technologies

Technology Speed Investment Best For
Manual sorting Low Low Low volume, complex items
Tilt-tray sorter Medium Medium Varied package sizes
Cross-belt sorter High High High volume, mixed sizes
Bomb bay sorter Very high High Flat items, envelopes
Robotic sorting Flexible Medium-High Growing operations

Carrier Sort Facilities

Major carriers operate massive sort centers:

  • USPS - Processing and Distribution Centers (P&DCs)
  • UPS - Worldport (Louisville) processes 2M+ packages/day
  • FedEx - Memphis SuperHub
  • Amazon - Delivery stations and sort centers

Sortation Accuracy

Accurate sorting is critical:

  • Missorts - Packages sent to wrong destination
  • Impact - Delays, extra handling, customer complaints
  • Target - 99.9%+ accuracy for high performers

Sort Plan

A sort plan defines:

  • Number of sort destinations
  • Assignment of zones/routes to lanes
  • Timing of sort waves
  • Handling of exceptions

Sortation Metrics

  • Throughput - Packages sorted per hour
  • Accuracy - % correctly sorted
  • Jam rate - Frequency of equipment jams
  • Recirculation rate - Packages requiring re-sort
  • Damage rate - Packages damaged during sort
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