Analysis of the air permeability of bamboo charcoal polyester fiber fabrics test
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. Therefore, studying its fabric properties has important theoretical value and practical significance. These properties are closely related to factors such as the fiber type and tightness of the yarn.
A fabric air permeability meter can be used to detect the air permeability of bamboo charcoal polyester fiber fabrics. Shanghai Qianshi Precision Electromechanical Technology Co., Ltd. is the manufacturer. Customers with needs are welcome to call for inquiries.
Applicable standards:
GB/T 5453-1997, GB/T 13764, ASTM D737, ISO 9237, ISO 5636
Main parameters:
1. Pressure difference range: 0~4000Pa;
2. Measurable air permeability: 0.2-12826mm/s;
3. Measurement error: ±2%;
4. Measurable fabric thickness: ≤12mm;
5. Air suction volume adjustment: dynamic adjustment based on data feedback;
6. Sample area setting circle: 5cm², 20cm², 50cm², 100cm²;
7. Nozzles: 11 in total.
Sample preparation:
According to the test plan, with reference to the specifications of several major bamboo charcoal polyester fiber woven fabrics on the market, bamboo charcoal polyester fiber fabric samples were prepared. The warping tension, warp, and weft tension during weaving must be properly controlled, otherwise, the weaving effect will be affected.The following points should be noted during weaving:
(1) Since it is manual warping, the warping tension should be as uniform as possible, and the difference in the length of the warp should not be too large, otherwise the opening will be unclear during weaving, which may easily increase the warp breakage rate and affect the testing effect.
(2) During weaving, if the warp tension is found to be too large or too small, press the cloth winding, cloth retracting, warp feeding, and rewinding buttons on the loom or click the cloth winding, cloth retracting, warp feeding, and rewinding buttons on the computer screen with the mouse 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, it will be difficult for the rapier to insert the weft; if the tension is too low, the weft yarn cannot be fully straightened and may bend in the fabric, causing the fabric surface to be uneven. If the tension is too low, it will be difficult for the fabric to hold the weft yarn and the weft yarn will be cut continuously. Adjust the nut on the tension disk on the weft break automatic stop device to make the weft yarn tension moderate.
According to the test plan, with reference to the specifications of several major bamboo charcoal polyester fiber woven fabrics on the market, bamboo charcoal polyester fiber fabric samples were prepared. The warping tension, warp, and weft tension during weaving must be properly controlled, otherwise, the weaving effect will be affected.The following points should be noted during weaving:
(1) Since it is manual warping, the warping tension should be as uniform as possible, and the difference in the length of the warp should not be too large, otherwise the opening will be unclear during weaving, which may easily increase the warp breakage rate and affect the testing effect.
(2) During weaving, if the warp tension is found to be too large or too small, press the cloth winding, cloth retracting, warp feeding, and rewinding buttons on the loom or click the cloth winding, cloth retracting, warp feeding, and rewinding buttons on the computer screen with the mouse 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, it will be difficult for the rapier to insert the weft; if the tension is too low, the weft yarn cannot be fully straightened and may bend in the fabric, causing the fabric surface to be uneven. If the tension is too low, it will be difficult for the fabric to hold the weft yarn and the weft yarn will be cut continuously. Adjust the nut on the tension disk on the weft break automatic stop device to make the weft yarn tension moderate.
Test results:
The air permeability of the fabric is essentially the process of air on both sides of the fabric flowing from the higher pressure side to the lower pressure side through the fabric under a certain pressure difference. There are two main ways for gas to pass through the fabric: one is through the gaps between the warp and weft yarns of the fabric, and the other is through the gaps between the fibers. Therefore, the quality of the fabric air permeability mainly depends on the size and number of gaps in the fabric and is also related to factors such as fiber properties, fabric geometry, and finishing.
In general, when the fabric structure is the same, the structural factors that affect the fabric air permeability are mainly the total tightness of the fabric, the warp and weft tightness ratio, and the linear density of the warp and weft yarns. For bamboo charcoal polyester fiber fabric samples, when the fabric organization and raw material thickness are the same, the fabric tightness becomes the main factor affecting the air permeability.
With the increase in total tightness and weft tightness, the air permeability of the fabric shows a continuous downward trend. This is because when the weft density of the fabric increases, the tightness of the yarn arrangement in the fabric increases, the total tightness of the fabric increases, the fabric gap area decreases, and the gas channel formed between the yarns becomes smaller, resulting in an increase in the viscous resistance of the air flowing perpendicular to the fabric, so the air permeability of the fabric decreases. However, when the tightness increases to a certain extent, the pores of the fibers in the yarn are already very small. Increasing the weft density can only increase the squeezing of the yarn by the fabric, while the pores change very little, and the reduction in air permeability is also reduced.