Textile Knowledge|Analysis of Factors Affecting Fabric Tensile and Tear Strength

2022-12-06 | Textile Fabric Knowledge

The tensile and tear strength of the fabric is an important indicator in the testing of woven fabrics.

The main factors that affect the tensile and tear strength of fabrics are as follows:

1. It is related to the breaking strength and strength of warp and weft yarns.

This is related to the fiber material and blending ratio of the yarn, the fineness of the fiber itself (count or tex) and the fineness of the yarn (count or tex), yarn uniformity, moisture regain or moisture content, single Factors such as the twist (twist coefficient) of the yarn or the strand, the single yarn and the strand, and the storage age of the fiber or yarn are all related. There are also factors such as elastic fibers, including their elongation, which will cause large differences.

2. The factors that affect the strength of the fabric are also related to the weaving method and weaving conditions of the fabric (such as knitted fabrics and woven fabrics), the organizational structure (such as plain weave, twill, satin, jacquard, others, etc.), and the density of warp and weft yarns.

Warp strength and weft strength are different, and burst strength is also different, whether it includes selvedge, solid edge or burr, whether to avoid defects and folds, and the distance from the original fabric selvedge may be different (so sampling must be at least 150 mm from the edge of the fabric). In addition, the strength of sizing grey fabrics and desizing fabrics, dyed and finished fabrics, especially those that have been impregnated and specially finished, will vary greatly. Weaving process, dyeing, sanding, etc. all have an impact. Thicker yarns show better strength than finer ones, twill is better than plain weave, no sanding is better than sanding, and the less corrosive the dyeing is, the better.

3. The strength of the yarn-dyed fabrics is different from the strength of the original yarn, the density of the warp and weft, the yarn fineness, and the finishing process. To improve the strength of the yarn-dyed fabrics, it is necessary to improve the strength of the yarn-dyed fabrics.

After the non-iron fabric is finished, the tensile and tearing strength will also decrease, which directly affects the durability of the fabric. The tensile and tear strength, yarn strength and elongation, weaving resistance, and morphological structure of the fabric before and after the non-iron finishing have significant effects on the strength. When the fabric woven by yarns with high strength and elongation is torn, the stress triangle area is large, and the number of yarns under common stress is large, and the tearing strength is high. The weave structure and the density of warp and weft yarns affect the interlacing points and slippage between the yarns. The less interwoven points, the easier the slippage between the yarns, and the higher the tearing strength of the fabric.

4. After wearing for a period of time in the actual wearing process, the yarn in the fabric becomes thinner due to friction, and some parts often suffer sudden tearing.

When squatting down, some parts of the buttocks of the trousers and the parts of the clothing are hooked by sharp objects. The external force on these parts causes the inner yarns of the fabric to be broken one by one under the ultimate load. During the use of textiles, if they are subjected to local concentrated loads for a long time, the strength may reach the limit and decrease, thereby affecting the tensile and tearing strength of the fabric.

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