MEMBER'S QUESTION:

I am trying to get a grasp on pin adhesion.  My starch supplier gave me the following minimums and targets to shoot for:

Grade                          Min                Target
26 lin- 35 lin                40#                  45#
42 lin                            45#                  50#
56 lin – 73 lin              52#                  57#

In a previous emai lyou stated “I like to see pin adhesion values average at 55#/linear foot of glue line, while others are willing to settle for 50#, the minimum values should not drop below 45#.”

I have tested 29 ECT and the DB Bottom Pan result was 41#.  Is 41# too low for 29 ECT?  The next day I tested 275 BC and the DB Bottom Pan result was 68#.  There were no changes to the starch settings on the machine between the two days. 

My question is: Why is there so much variability in the Pin Adhesion results and is that normal?  I check B flute and C flute pin adhesion once a week and there is always a large variance from week to week. 

 

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