Glass Container & Bottle Manufacturing worked example

Annealing Lehr Capacity at 68% annealing lehr uptime: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop annealing lehr uptime to 68%, then walk the calculation through step by step. Estimate good container capacity through an annealing lehr using containers per lehr cycle, available cycles, lehr uptime, and first-pass yield.

The inputs for this scenario

  • Containers per lehr cycle: 850 containers / cycle (held at the documented default)
  • Available lehr cycles: 22 cycles (held at the documented default)
  • Annealing lehr uptime: 68 % (the input this scenario stresses; the baseline uses 94)
  • Post-lehr first-pass yield: 98 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross annealing lehr capacity = containers per lehr cycle × available lehr cycles.
  • Good annealed container capacity works out to 12,462 containers at these inputs, and this is the headline figure for the scenario.
  • Gross lehr container capacity works out to 18,700 containers at these inputs.
  • Annealing lehr uptime loss works out to 5,984 containers at these inputs.
  • Post-lehr yield loss works out to 254 containers at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where annealing lehr uptime sits at 94% and the headline result is 17,226 containers, this scenario comes in 27.66% below the baseline at 12,462 containers.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to annealing lehr uptime, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It assumes a steady containers-per-cycle loading and a single yield figure; checks and chips that show up only after later inspection or filling are not captured by first-pass cold-end yield alone.

Results at a glance

  • Good annealed container capacity: 12,462 containers (headline result)
  • Gross lehr container capacity: 18,700 containers
  • Annealing lehr uptime loss: 5,984 containers
  • Post-lehr yield loss: 254 containers

Run it with your numbers

  • To rerun this with your own numbers, open the live Annealing Lehr Capacity calculator, set annealing lehr uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.