Knowledge Base
Can Shell and End QC: Glossary and Fact Sheet
Key terms
| Term | Definition |
| Can shell | The drawn body of a two-piece can, before the end is seamed on. |
| Can end | The lid component, often an easy-open end, seamed onto the shell. |
| Double seam | The interlocked fold that joins the end to the shell to create a hermetic seal. |
| Opening force | The force needed to open an easy-open end, also known as pop and tear. |
| Buckle pressure | The internal pressure at which an end or shell deforms. |
| Burst pressure | The internal pressure at which an end or shell fails structurally. |
| Enamel rater / metal exposure | A test of internal coating integrity using electrical conductivity to detect exposed metal. |
| Sealing compound | The material applied to the end curl that helps form a tight double seam. |
| Score residual | The remaining metal thickness beneath the score line on a can end. |
| EOE progression | Inspection of the dimensional features of an easy-open end across conversion stages. |
Equipment quick reference
| Test category | Beverage equipment | Food equipment |
| Opening performance | Torus Z603 | Torus Z603 (semi-auto) |
| Pressure resistance | Torus Z605 | Torus Z615 (semi-auto) |
| Coating integrity | Torus Z604 (beverage) | Torus Z604 (food) |
| Seal quality | Torus Z403 | Torus Z403 (food) |
| Score integrity | Torus Z606 | Torus Z606 |
| Visual and dimensional | Z401 and Z601 | Z411 and Z611 |
Was this useful?
Related Products
-
Torus Z603 Automatic Beverage End Opening Force Gauge
The Z603 'Enhanced' Automatic Beverage End Opening Force Gauge from Torus builds on the success of the standard model used by leading end makers.
-
Torus Z615 Benchtop Semi-Automatic Food End Buckle and Burst Gauge
The Torus Z615 Benchtop Semi-Automatic Food End Buckle & Burst Gauge applies controlled air pressure to your food ends to simulate real world conditions.
-
Torus Z604 Automatic Beverage Shell and End Enamel Rater
The Torus Z604 Automatic Beverage Shell and End Enamel Rater delivers fast, accurate, and fully automated lacquer integrity measurement for beverage can manufacturers - helping protect product quality, ensure compliance, and reduce inspection time.
-
Torus Z403 Automatic Food Shell Compound Weight and Placement Gauge
The Z403 Automatic Food Shell Compound Weight and Placement Gauge has been designed to reduce the significant labor time associated with manual Compound Weight and Placement checks, whilst also reducing the risk of human error in this manually labor intensive process.
-
Torus Z606 Automatic Score Inspection Gauge
The Torus Z606 Automatic Score Inspection Gauge features successfully tested automatic, non-contact technology for accurate, reliable, and traceable measurement of beverage and food can ends.
-
Torus Z411 Automatic Food Shell Inspection Gauge
Designed for perfect food can shell production, the Torus Z411 provides essential contact measurement data for dimensional inspection of food can shells.
FAQs
-
A complete programme covers opening force, buckle and burst pressure, enamel rater (coating integrity), compound weight and placement, score residual, and visual and dimensional inspection. Each targets a different risk – strength, sealing, coating, usability, or precision – so all are needed for full coverage.
-
Automated systems offer higher accuracy and repeatability, remove operator subjectivity, run faster cycles for high-speed lines, and provide real-time data for process optimization. They also reduce waste, labor costs, and production risk.
-
Buckle pressure is the point at which an end or shell deforms, while burst pressure is the point at which it fails structurally. Both are measured by applying controlled air pressure to simulate real-world conditions during filling, storage, and transport.
-
Coating integrity is checked with an enamel rater, which uses electrical conductivity to detect metal exposure, pinholes, and coating defects in the internal protective layer. The Torus Z604 enamel raters automate this for high-throughput inspection.
Related Articles
-
What Quality Control Tests Are Required for Can Shell and End Manufacturing? There is no single quality control test for can manufacturing. Consistent quality across food and beverage cans relies on a set of tests applied to both can shells and ends, because food and beverage cans must meet extremely tight tolerances. Even minor variations can cause…
-
Maintaining consistent quality in beverage and food can production requires a comprehensive set of quality control tests across both can shells and ends. This guide gives an overview of the essential tests and the inspection systems used across modern production lines, so you can build a multi-layered testing strategy with confidence. Why quality control is…
