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Box Gap, Panel Alignment, Folding, Slotting and Scoring Assessment

One of the box manufacturing industries headaches is the correct

aligning of a Flexo Folder Gluer. It is all about the correctly

manufacturing of the FEFCO 0201 a "RSC" regular corrugated


Technology Coaching has developed the test and evaluation procedure BoxAssess including the gap jig. BoxAssess allows to evaluate the feeding, slotting and folding of the board. New in this is that also over- and under- folding will be evaluated using the gap jig. The gap jig is also used for measuring gap and panel alignment. BoxAssess provides detailed information about the folding accuracy but also about feeding and slotting accuracy. Using this method allows to align all parts of the FFG. It minimizes waste and set- up time but it also helps to get a good box geometry which maximizes the box strength. BoxAssess will support you to improve your RSC quality and reduces waste thus saves the environment.

This is a graphical example of the data results for

slotting and feeding.

Also folding is evaluated. The graphs show gap variation and


The following images explain the term “Under- and Over- Folding”:

The collected data allows identifying any problems in

your FFG but also what to do to correct them.

In addition to BoxAssess the “Gap Error Simulation” tool is


This tool allows to simulate the impact on the gap error of a folded box due to: o The misalignment of the slots o The skew of the board o The size of the box. Misalignment of the slots (the 2 outside slots) has 2 parts: 1. The cross production direction offset relative to the target position of the slot which is in the tool “Input error” section the first column “CPD offset” where the error can be set. 2. The offset between the lead edge knife and trail edge knife of a slot which is in the tool “Input error” section the second column “skew mm/m” where the error can be set. The centre slot (2) is the reference for the calculation yet this slot can also not be in the centreline of the machine too. The gap error calculations are based on not using a side-trim knife thus the glue panel skew represents also the board feed skew. Over- and under- folding is not separately included in the gap error calculation but has a similar impact on the gap as the error of slot 1 and 3 on the gap. A 1mm cross production direction move of slot 1 or 2 result in a 2 mm gap deviation where as an over- under- folding error of 1 mm results in a 1 mm gap deviation. The tool will give an inside on the size of the gap error due to not correct aligned slots and/or feeder. Click on the next image to start the tool

BoxAssess download

Download Brochure Contact Technology Coaching if you want more information or a quotation.

Read more about folding variation in the following article:

“The Digitallab - Tools for corrugated”

International Paper Board Industry, February 2022

“How to improve the folding of an RSC”

International Paper Board Industry, January 2012