The ‘CanNeed-BLT-100 Tumbling Tester for Crown Closures" is for evaluating the abrasion resistance of caps.
Inspection methods:
1. Clean and weigh 25 pieces of caps. The weight should be accurate to 0.1mg.
2.Put the caps into the tanks of BLT-100, and tumble them for 50 mins at the speed of 20 rpm per min.
3. Take the caps out, clean the wearing film on the caps and then weigh the caps. The weight should be
accurate to 0.1mg.
4. Do the above steps for a parallel sample. Please take the average of the deviations between values
of the two groups as the abrasion values of the caps. 
Please refer to the following table for qualification range of the results:

	Unit	Value of Qualification	Value of High Quality
One color	mg	≤20	≤18
Two colors	mg	≤25	≤22
Three colors	mg	≤35	≤28
Four colors	mg	≤40	≤33