Analysis of the air permeability of bamboo charcoal polyester fiber fabrics by fabric air permeability tester

The properties of bamboo charcoal polyester fiber fabrics, such as air permeability, elasticity, drape, etc., directly affect the comfort and beauty of the human body when wearing, so the study of its fabric properties also has important theoretical and practical significance. These properties are closely related to the types of fibers, tightness and other factors that make up the yarn. The fabric air permeability meter can be used to detect the air permeability of bamboo charcoal polyester fiber fabrics. (Hong Kong) Co., Ltd. is a manufacturer. Customers who have needs are welcome to inquire. Applicable standards: GB/T 5453-1997, GB/T 13764, ASTM D737, ISO 9237, ISO 5636 Main parameters: 1. Differential pressure range: 0～4000Pa; 2. Measurable air permeability: 0.2—12826mm/s; 3. Measurement error:≤±2%; 4. Measurable fabric thickness:≤12mm; 5. Suction volume adjustment: dynamic adjustment by data feedback; 6. Sample area setting circle: 5cm2, 20cm2, 50cm2, 100cm2; 7. Nozzle: 11 in total. Sample development: According to the test plan, referring to the specifications of several bamboo charcoal polyester fiber woven fabrics currently on the market, the bamboo charcoal polyester fiber fabric samples are produced. Otherwise, the weaving effect will be affected, and the following points should be paid attention to when weaving: (1) Since it is manual warping, try to make the warping tension uniform, and the difference in warp length should not be too large, otherwise the opening of the weaving will be unclear, which will easily cause the warp to break. The increase of the rate will affect the test effect. (2) During weaving, if the warp tension is found to be too large or too small, press the roll-up, unwind, let-off, and rewind buttons on the loom or click the roll-up, unwind, and let-off buttons on the computer screen with the mouse. , Rewind button to adjust the warp tension to an appropriate level. (3) The tension of the weft yarn should also be appropriate during weaving. If the tension is too high, the rapier will be difficult to insert; if the tension is too small, the weft yarn cannot be fully straightened, and may be bent in the fabric, causing the surface of the fabric to be uneven, and the tension is too small. It is difficult for the fabric to hold the weft yarns and the weft yarns are constantly being cut. Adjust the nut on the tension disc on the weft breaking automatic stop device to make the weft tension moderate. Test results: The breathability of the fabric is essentially the process that the air on both sides of the fabric flows from the higher pressure side through the fabric to the lower pressure side under the condition of a certain pressure difference. There are two main ways for gas to pass through the fabric: one is to pass through the gap between the warp and weft yarns of the fabric, and the other is to pass through the gap between the fibers. Therefore, the air permeability of the fabric mainly depends on the size and number of voids in the fabric, and is also related to factors such as fiber properties, fabric geometry and post-finishing. In general, when the fabric structure is the same, the structural factors that affect the air permeability of the fabric are mainly the total tightness of the fabric, the warp and weft tightness ratio and the linear density of the warp and weft yarns. Bamboo charcoal polyester fiber fabric samples in the case of the same fabric structure and raw material thickness, the fabric tightness becomes the main factor affecting the air permeability. With the increase of the total tightness and the weft tightness, the air permeability of the fabric shows a decreasing trend. This is because when the weft density of the fabric increases, the tightness of the yarns in the fabric increases, the overall tightness of the fabric increases, the void area of ​​the fabric decreases, and the air passages formed between the yarns become smaller, causing the air to flow perpendicular to the fabric. The viscous resistance increases, so the breathability of the fabric decreases. However, when the tightness increases to a certain level, the pores of the fibers in the yarn are already very small, and increasing the weft density can only increase the extrusion of the fabric on the yarn, but the change in the pores is small, and the decrease in air permeability is also reduced. .

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