Method for determining reference force of e.g. spunbonded fabric, utilized as carrier insert for producing roofing sheet, involves comparing reinforced planar structure exhibiting reference force with planar structure without reinforcement

摘要

The method involves removing a sample of a reinforced planar structure by punching holes in the reinforced planar structure for measurement of reference force. Reinforcement of the reinforced planar structure is transectioned in accordance with the removal of the sample. The reference force at the punched sample is measured at low extensions in the range of 0 to 5 percentage at 20 degree Celsius. Force-extension diagram is determined. The reinforced planar structure with the measured reference force is compared with a planar structure without reinforcement.