Leakage inspection：
When the sealing is completed, the sealed cans which are picked at random will be put in a vaccum container with the negative pressure -50Kpa.
AUTOMATIC SEAM TIGHTNESS MEASUREMENT
Correctly evaluating tightness is critical to maintaining double seam quality. Our factory use VSM-X devicce to measure seam tightness from the captured seam image!
Double seam inspection:
OVERLAP
Calculation of overlap length:
Overlap Length = CH + BH + T – SH
Where CH = Cover Hook
BH = Body Hook
*T = Cover Plate Thickness
SH = Seam Height (Width or Length)
*In general practice, .010″ may be used for the cover thickness. However for accuracy, the actual plate thickness of the cover should be used.
Calculation of percent overlap:
Overlap, % = 100 x (BH + CH + T – SH) / [SH – ((2 x T) + BPT)]
Where BH – Body Hook Length
CH = Cover Hook Length
T = Cover Plate Thickness
SH = Seam Height
BPT = Body Plate Thickness
Use minimum value found for each measurement (maximum value for SH).
PERCENT BODY HOOK BUTTING
Calculation of overlap length:
Body Hook Butting % = A / B x 100
IT IS RECOMMENDED OVERLAP AND BODY HOOK BUTTING BE OPTICALLY MEASURED.
