GB/T 31334.7-2025Test methods for dipped canvas — Part 7: Adhension properties after dynamic fatigue (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is Part 7 of GB/T 31334 Test methods for impregnated canvas. GB/T 31334 has been published in the following parts.

--- Part 1: Adhesion strength;

--- Part 2: Warp curl and density;

--- Part 3: Stiffness;

--- Part 4: Dry heat shrinkage;

--- Part 5: Tensile properties;

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

--- Part 7: Dynamic fatigue adhesion properties.

Introduction

Dipped canvas has the characteristics of high strength and resistance to flexing. It is the main skeleton material for rubber products such as conveyor belts. Its application environment is relatively complex.

As a reinforcing material for rubber products, dipped canvas determines the main physical properties of rubber products.

There are many indicators. According to the actual situation of the industry at home and abroad, the physical performance test method of dipped canvas is formed into GB/T 31334 "Dipped Sail The "Test Methods for Rubber Canvas" can make the technical exchanges on the manufacturing and technical performance of dipped canvas in the industry more convenient and efficient, which is conducive to improving the quality of the product.

Improve product quality and promote coordinated development and technological progress of upstream and downstream industries.

GB/T 31334 "Test methods for impregnated canvas" is divided into seven parts.

--- Part 1: Adhesion strength. The purpose is to describe the test method for the adhesion strength of dipped canvas.

--- Part 2: Warp curl and density. The purpose is to describe the test method for warp curl and density of dipped canvas.

--- Part 3: Stiffness. The purpose is to describe the test method for the stiffness of dipped canvas.

--- Part 4: Dry heat shrinkage. The purpose is to describe the test method for dry heat shrinkage of impregnated canvas.

--- Part 5: Tensile properties. The purpose is to describe the test method for the tensile properties of dipped canvas.

--- Part 6: Measurement of basic items such as size and weight. The purpose is to describe the test of thickness, width, length and weight of dipped canvas method.

--- Part 7: Dynamic fatigue adhesion performance. The purpose is to describe the test method for the dynamic fatigue adhesion performance of dipped canvas.

1 Scope

This document describes the determination of the adhesion between dipped canvas and rubber after dynamic fatigue test by vulcanizing dipped canvas and rubber into strip specimens. Performance test method.

This document is applicable to the determination of dynamic fatigue adhesion properties of impregnated canvas.

This document is not applicable to straight warp and weft impregnated canvas.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 2941 Rubber physical test methods - General procedures for specimen preparation and conditioning

GB/T 6038 Rubber test compounds - Ingredients, mixing and vulcanization equipment and operating procedures

GB/T 8170 Rules for rounding off values and expression and determination of limit values

GB/T 12833 Rubber and plastics - Multimodal curve analysis in the determination of tear strength and adhesive strength

GB/T 31334.1 Test methods for impregnated canvas Part 1: Adhesion strength

GB/T 32110 Terms and definitions for impregnated skeleton materials

3 Terms and Definitions

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

4 Test Principle

The dipped canvas and rubber were vulcanized to make the sample, and the sample was repeatedly bent using a belt flexure tester according to the set test conditions.

The adhesive strength between the rubber and the canvas of the fatigued specimen, the rubber coverage of the fatigued area surface and the adhesive strength of the non-fatigued specimen were measured.

The ratio of the bonding strength of the fatigued specimen to the bonding strength of the non-fatigued specimen is the bonding strength retention rate, which is expressed as the bonding strength retention rate, The rubber coverage of fatigue area characterizes the dynamic fatigue adhesion performance between dipped canvas and rubber.

5 Instruments and Tools