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Roll length (running meters)

For practical reasons, the net material weight (i.e. minus the winding core) on the roll is used to determine the roll length, taking into account the determined mass per unit area and the web width. For shorter roll lengths (max. 50 running meters), it is also possible to unwind the film and measure the length oof the web with a calibrated measuring tape . Note: In the field of soft plastic films (e.g. made of polyethylene), the roll running lengths can be affected by elastic forces added during production if the measurement is carried out by a measuring device running on the material web within the production machine. The usual running length tolerance of ± 2%, for example, must therefore be increased by up to 10% for functional reasons or taken into account accordingly in the unwinding tension.

test method:	Mechanical properties
Norms:	GKV Blatt I- IV (2018-08)
Needed sample size:	At least one original role.

Standardprüfungen

Gravimetric determination based on the net roll weight
This is a reference method that is suitable for checking the running length of any roll size. The prerequisite is a calibrated balance with the appropriate measuring range and precise knowledge of the weight of the core, the web width and the mass per unit area of the wound material. If this data is not known, the values can also be determined using suitable measuring methods.

tesile test laminated films/ orientated films DIN EN ISO 527
For practical reasons, measurements in the laboratory can only be carried out on short rolls with a maximum length of approx. ≤ 50 linear meters. Comparative measurements can be carried out on rolls of any length by running counters on the film web in the production environment.

Comparative measurement of mechanical and gravimetric method
The results of the mechanical length measurement are compared here with the reference method with the aforementioned limitations and conditions for both methods.

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Matthias Böhne

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Information about tests

Roll length (running meters)

Standardprüfungen

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