GB/T 31334.3-2015Test methods for dipped canvas—Part 3: Stiffness (English PDF)

1 Scope

This section provides stiffness was measured using dipped canvas stiffness test methods.

This section applies to nylon, polyester, polyester and nylon, polyester dipped canvas measuring stiffness.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein

Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 6529 Textiles Standard conditioning and testing atmosphere

GB/T 8170 repair value expressed about the rules and limit values and judgment

3 Terms and Definitions

The following terms and definitions apply to this document.

4 Test principle

The sample is placed along the longitudinal direction of the platform stiffness meter level platform to promote the sample so that it extends under the weight of the platform and a natural bent,

When the head end of the sample is exposed to 41.5 ° angle to the horizontal slope, then extended length equal to twice the length of the curved sample (see

Appendix A), in order to calculate the sample bending length and flexural rigidity to flexural rigidity characterize the stiffness of the sample. When the head end of the sample can not be oblique

When the surface contact with the sample of the present method is not applicable.

5 instruments and equipment

The use of part stiffness tester shown in Figure 1, shall meet the following requirements.

a) having a width of (40 ± 2) mm platform length not less than 400mm, supported on the desktop at least above the height of 350mm;

b) by the leading edge of the platform and ramp angle of 41.5 ° to the horizontal table;

c) the surface of the platform to prevent sample adhesion lubricious coating;

d) a horizontal measurement and adjustment means;

e) from the platform at the leading edge of 10mm marked lines;