GB/T 31334.6-2020Test methods for dipped canvas—Part 6: Determinations of size, grammage, etc (English PDF)

Foreword

GB/T 31334 "Test Method for Dipped Canvas" is divided into 6 parts.

---Part 1: Adhesive strength;

---Part 2: Warp curl and density;

---Part 3: Stiffness;

---Part 4: Dry heat shrinkage rate;

---Part 5: Tensile performance;

---Part 6: Measurement of basic items such as size and weight.

This part is Part 6 of GB/T 31334.

This section was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This part of GB/T 31334 specifies the test methods for the thickness, width, length and weight of dipped canvas.

This section applies to the test of basic items such as size and weight of dipped canvas made of fibers.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document.

GB/T 6529 Standard atmosphere for textile humidity control and testing

GB/T 8170 Numerical rounding rules and the expression and determination of limit values

GB/T 32110 Terms and definitions of dipped framework materials

HG/T 2765.4 blue rubber indicator, color-changing silica gel and cobalt-free color-changing silica gel

3 Terms and definitions

The following terms and definitions defined in GB/T 32110 apply to this document.

4 Test conditions

The test should be carried out under the standard atmospheric environment specified in GB/T 6529.

5 Equipment

5.1 Constant temperature oven. The temperature can be adjusted to (105±2)°C.

5.2 Electronic balance. The range is 100g, the minimum graduation value is 0.01g, and the accuracy level is Class III.

5.3 Steel ruler. The minimum graduation value is 1mm.

5.4 Steel tape measure. the minimum graduation value is 1mm, and the accuracy grade is II.

5.5 Dryer desiccant. Use the blue gum indicator specified in HG/T 2765.4 as the desiccant.

5.6 The thickness gauge shall meet the following requirements.

a) The minimum graduation value is 0.01mm;

b) Measuring range. 0mm~10mm;

c) The diameter of the upper pressure plate is (9.5±0.3) mm, and the pressure applied to the sample is (170±3) cN;

d) There is a lower pressure plate.