Breathability of fabric
The breathability of fabrics refers to the ability of gas molecules to pass through the fabric. It is the basic performance of fabric permeability. Breathability will directly affect the warmth, moisture permeability, windproof and other wearing properties of fabrics, and plays a role in the energy exchange between the human body and the environment. It plays an important role in evaluating the comfort performance of clothing. After the fabric absorbs moisture, various indicators will change due to the influence of water, including breathability.
Effect of moisture content on breathability of knitted fabrics
The air permeability of knitted fabrics first increases and then decreases as the moisture content increases. During the air permeability process, gas passes through two paths: the holes in the fabric and the gaps between fibers in the yarn. Generally, the holes are the main path, and the knitted fabric is moisturized. The fibers expand after being wet. However, since the knitted fabric is knitted by forming loops, the structure is relatively loose and the yarn has a relatively large space for movement, which does not make the pores between the yarns significantly smaller. On the contrary, after the knitted fabric is wetted The surface hairiness is lodging and the thickness of the fabric is reduced, which reduces the length of the breathable pipes in the fabric, increases the breathable pore size, and increases the air permeability, that is, the air permeability of the wetted fabric increases. As the moisture content further increases, Water mainly exists in the form of free water, occupying the pores of knitted fabrics, and easily forms a continuous water film between fibers, and the air permeability is subsequently reduced.
Effect of moisture content on breathability of woven fabrics
As the moisture content increases, the air permeability of the fabric decreases significantly. Woven fabrics are made of warp and weft yarns that are vertically interwoven with each other. After the woven fabric absorbs moisture, the length and cross-sectional area of the fibers expand, and this expansion It shows obvious anisotropy. After the fiber absorbs moisture, it expands very little in the length direction, but expands a lot in the diameter direction, which leads to an increase in the curvature of the yarns in the fabric, and at the same time they squeeze each other, and the yarns between the yarns The gaps in the fabric are reduced and the fabric shrinks; coupled with the attached moisture, the gaps in the fabric are further blocked, resulting in a significant decrease in the air permeability of the fabric.
Extended reading: https://www. alltextile.cn/product/product-48-329.html
Extended reading: https:/ /www.tpu-ptfe.com/post/7.html
Extended reading: https://www.alltextile.cn/product/product-3-663.html
Extended reading:https://www.yingjietex.com/product/Polyester-DOBBY-OXFORD-Fabric.html
Extended reading:https://www.china-fire-retardant.com/post/9570.html
Extended reading:https://www.china-fire-retardant.com/post/9393.html
Extended reading:https://www.alltextile.cn/product/product-13-878.html
Extended reading: https://www.brandfabric.net/elastic- knitted-fabric-4mm-sponge-elastic-knitted-composite-fabric/
Extended reading:https://www.yingjietex.com/product/300D-120D-Polyester-Punctate-Plain-OXFORD-Fabric.html
Extended reading:https://www.alltextile.cn/product/product-56-468.htm
