Manufacturer’s joint tolerance

Kenny asks,

I am new to the AICC family and I have a question I hope you can help me with. I have a customer that is asking questions about the tolerances on an RSC box, specifically the glue joint gap dimension. As I understand from the FBA Handbook, a box maker has 1 board thickness of tolerance after machining. To be even more clear, for a C flute box, a box maker has approximately 3/16” total, that a gap can deviate from where it is designed from (3/32” from Center on both sides).

Well welcome to the family Kenny.

The tolerance as I have always understood it (for fishtail) is no more than 3/16 variance overall from the score line to the end of the flap regardless of the thickness of the sheet. Nor should the gap width at any point of the manufacturer’s joint be less than 1/16 inch in width, again regardless of substrate thickness.

However, with automated packing lines, customers may require a tighter or more consistent tolerance.

This is a battle that has been going on since Hector was a pup and always seems to be a topic for discussion.

– Ralph

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