The critical parameters of the double closure are essential aspects that guarantee the quality and tightness of the closure on metal containers. Some of these critical parameters are detailed below:

1. Percentage of corrugations: Corrugations in the seal may affect the integrity of the seal. It is important to keep this percentage under control to ensure a hermetic and quality seal.
   
2. Overlap / %Overlap: The overlap refers to the amount of material that overlaps in the closure. An adequate overlap guarantees a tight and resistant seal.
   
3. Body hook penetration percentage: This parameter indicates the depth to which the body hook penetrates the closure. An adequate penetration rate ensures a strong and tight seal.
   
4. Absence of visual defects: Visual defects in the seal may affect its quality and tightness. It is important to inspect the seal for defects and correct them if necessary.
   
   In addition, in some cases, the following parameters are also considered critical:
   
5. Body hook: The shape and size of the body hook are important to ensure a tight and resistant seal.
   
6. Lid hook: The shape and size of the lid hook are also important to ensure a quality seal.
   
7. Overlap percentage: This parameter indicates the amount of material that overlaps in the closure. An adequate percentage of overlap ensures a tight and resistant seal.
   
8. Percentage of compactness: The compactness of the seal is important to ensure its strength and tightness. An adequate percentage of compactness ensures a quality seal.
   
   It is essential to control and maintain these critical parameters within acceptable limits to ensure the quality and tightness of double seals on metal containers. 😊

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