Opening resistance of folding boxboards
Determination of box opening resistance
- Evaluate the machinability of folding boxboards on the conditioning line
- Characterise the difficulties that folding cartons can cause when they are shaped on conditioning lines
- Analysis in connection with the creasing quality of the edges and the stiffness of the material
General informations
The test consists in measuring the resistance exerted by the folding boxboard as it is opened by using a dynamometer to compress two opposing edges held by brackets.
The compression is applied by moving a force sensor that records the maximum opening resistance exerted by the boxboard.
In order to determine the extent to which the creasing conditions are the cause of variations in resistance observed on different folding cartons, this test is generally accompanied by:
- Characterisation of the creasing quality along the edges and flaps by measuring the height of the creasing bead, and/or folding resistance using a Marbach device.
- Characterisation of the cellulosic material in terms of bending resistance.
Technical Data and Achievements
Tests are performed on the dynamometer with jaws equipped with specific brackets in order to set the folding carton (delivered flat) in place.
Various speeds can be used for the test.
The compressive force on the folding carton is recorded during the test and represented on a graph as a function of the gap between the plates. The maximum force required to open the carton is recorded, in addition to the spring effect when the folding carton is shaped at the end of the test.
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