A droop occurs when a small smooth portion of the seam extends below the bottom edge of the seam at the cover hook. This is near a false seam, but this type of defect can still be seen as a closed seam (i.e., it does not lose pressure). However, it can be seen visually and will ultimately cause a false seam if untreated.

Droops can also occur in some cases, by product entrapment in food (in particular fish) food cans.

This is what a drooping double seam looks like using a double seam inspection tool SEAMetal & SEAMscan.

Rep0037-Hd01-Sc02-false seam 4

The trouble with the droop is that if you miss it visually, it is localized so just cutting in 3 places randomly may not exhibit the issue. Here is what a droop looks like on a Non-destructive 360 degree scanning of the can with SEAM360, AUTO-XTS or Combination Seam Gauge and for the thickness and length of the can – both thickness and length graphs are affected and are higher than the maximum standard specification at the same points.


Possible reasons for Droops:

Solutions to support on droop related issues

Solutions such as the Combination Seam Gauge, SEAM360, and Auto XTS can support with a variety of droop related issues. The instrument you require however would depend on your specific needs. 

The CMC-KUHNKE Auto XTS is a fully-automated, on-line or stand-alone measurement system that provides non-destructive, complete double seam inspection for beverage fillers and metal cans. This unique and versatile instrument allows you to increase the accuracy and speed of your test and measurement processes and reduce spoilage, saving you time and money.  

Our CMC-KUHNKE SEAM Scan XTS works in conjunction with the highly powerful seam software we provide. It’s a powerful double seam inspection tool that will accurately measure the double seam of any round can in a non-destructive fashion. The SEAM Scan is a stand-alone measurement system. And the accurate gauge performs fast cross-sectional measurements and 360° tightness scans that reduce your labor costs. 

And our CMC-KUHNKE Combination Seam Gauge (CSG) offers precise seam thickness and countersink depth while also including a 360 degree scan of the can.