ISO 505:2017 pdf download

ISO 505:2017 pdf download.Conveyor belts — Method for the determination of the tear propagation resistance of textile conveyor belts
1 Scope
This document specifies a method of test for the measurement of the propagation resistance of an initial tear in textile conveyor belts, either in full thickness or of the carcass only.
This test is intended for application to textile belts in installations where there is a risk of longitudinal tearing.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6133, Rubber and plastics — Analysis of multi-peak traces obtained in determinations of tear strength and adhesion strength
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Principle
The test consists in measuring, by means of tensile testing at a given speed, the force necessary to propagate an initial tear made in a test piece.
5 Apparatus
The apparatus consists of a dynamometric tensile testing machine with the following essential characteristics:
a) the machine shall be chosen so that the forces to be measured come within the upper 90 % range of its full rated capacity;
b) the speed of separation of the jaws shall be capable of being adjusted to (50 ± 10) mm/min;
c) the free distance between the jaws shall be capable of being adjusted to at least 300 mm.The machine shall be provided with a device for the graphical recording of the force necessary to continue tearing the test piece.
6 Test pieces
6.1 Method of sampling
Test pieces shall be taken from the sample in the longitudinal direction of the belt and at a minimum
distance of 50 mm from the edges of the belt.
6.2 Shape and dimensions
Shape: rectangular.
Length: 300 mm.
Width: (100 ± 1) mm.
Thickness: Full belt thickness or without covers.
If it is found that weft threads are pulled out of the test piece instead of breaking, the width of the test piece should be increased to 300 mm.
6.3 Number
Two test pieces shall be used: one in sense A and the other in sense B (see Figure 4).
6.4 Preparation
Where the test is to be conducted without covers, the covers of the test pieces shall be removed by stripping or by buffing.
If there is a breaker ply, strip the corresponding covers without cutting the breaker ply over a width of 20 mm only, i.e. 10 mm on each side of the longitudinal axis of the test piece with the exception of the zone held in the jaws of the machine (see Figure 1).