Non-destructiveA careful external visual examination of containers and their seals is the primary means of detecting container defects.
To visually observe defects in food packages.> 100 μmOn-line
Representative samples are obtained from production line. External
surfaces are examined for holes, abrasions, delamination, and correct design. Critical dimensions are measured and observations
- Strong light without glare, for visual inspection of packages
- Measuring devices, such as ruler, calipers, micrometer
- Scissors or knife
Refer to examination procedures for paperboard packages, flexible pouches, plastic packages with heat-sealed lids, and plastic cans with double-seamed metal ends.
Visually detected defect.
No visually detected defects.
Visual identification of defect not actually present.
Defect is present, but not visually detected.
PACKAGE TYPES AND DEFECTS
|DEFECTS||Flexible Pouch||Semi-rigid and |
Rigid plastic container
|Plastic Can (Double-seam Metal End)||Paperboard|
|Double Seam Defects*|
|Foreign Matter Inclusion|
|Loose Flap or Ear|
|Seal Defects (Blister)|
|Seal Defects (Blocked)|
|Seal Defects (Burnt)|
|Seal Defects (Compressed)|
|Seal Defects (Contaminated)|
|Seal Defects (Convolution/Embossing)|
|Seal Defects (Creep)|
|Seal Defects (Crooked)|
|Seal Defects (Incomplete)|
|Seal Defects (Misaligned/Deformed)|
|Seal Defects (Nonbonding/Weak)|
|Seal Defects (Plastic Lumps)|
|Seal Defects (Seal-width Variation)|
|Seal Defects (Stringy)|
|Seal Defects (Uneven Impression)|
|Seal Defects (Uneven Juncture)|
|Seal Defects (Wrinkle)|
|Swell (Swollen Package)|
Visual inspection has a sensitivity of 10-2 Pa m3s, and is generally a gross leak detection technique. This method is time consuming, expensive and its monotonous nature may induce operator fatigue.