ISO 8094 pdf download

ISO 8094 pdf download Steel cord conveyor belts — Adhesion strength test of the cover to the core layer
1 Scope
This International Standard specifies a test method for determining the adhesion strength of the cover to the core layer.
It applies exclusively to steel cord conveyor belts.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 36, Rubber, vulcanized or thermoplastic — Determination of adhesion to textile fabrics
ISO 6133, Rubber and plastics — Analysis of multi-peak traces obtained in determinations of tear strength and adhesion strength
ISO 18573, Conveyor belts — Test atmospheres and conditioning periods
3 Test principle
Measurement of the force required to separate the covers from the core layer by stripping.
4 Apparatus
4.1 Tensile test machine with jaws, in accordance with the equipment described in ISO 36.
5 Specimens
Take six specimens with the following dimensions:
a) belts without weft, with or without textile reinforcement:
1) length (in the longitudinal direction of the belt): 150 mm min.;
2) width: 25 mm min. and containing at least two steel cords;
3) thickness: full thickness of the belt;
b) belts with metallic weft:
1) length (in the direction of the cord layer): 150 mm min.;
2) width: 25 mm ± 0,5 mm;
3) thickness: full thickness of the belt.
Cut the specimens parallel to the axis of the belt and at least 50 mm from the belt edge.
Using a knife, cut the cover rubber on either side ofthe specimen along the upper and lower edges ofthecords along a length sufficient for a safe grip in the jaws of the test machine.
6 Procedure
6.1Carry out the test in accordance with ISO 36, at least five days after manufacture of the belt.
Unless otherwise specified, and so indicated in the test report, carry out the test at 23 °C + 2 °C and50 % + 5 % relative humidity in accordance with ISO 18573, Atmosphere B.
6.2From the first three specimens, fix the top cover in one jaw of the test machine and the core layerincluding the cords (without the bottom cover) in the other jaw.
63 Start the test machine, with the gap widening speed of the jaws maintained constant at100 mm/min +10 mm/min.
6.4Record a graphical plot of the force
6.5From the remaining three specimens, fix the bottom cover in one jaw and the core layer, includingthe cords in the other jaw, and repeat the test in accordance with 6.3 and 6.4.
6.6Carry out three tests
6.7If the adhesion strength of the cover to the core layer is greater than the tear strength of the coreayer, the maximum force obtained is recorded together with the mode of failure.
7 Expression ofresults
71 From the recordings ofthe separating force variations,determine the median force F in accordance
with ISO 6133.