Research On The Test Of Fabric Dynamic Moisture Transfer Performance Based On Image Technology

With the continuous research and development of moisture absorption and quick-drying textiles,fabrics with excellent moisture absorption and perspiration performance are often used in sportswear,casual wear,underwear and other clothing textiles.These fabrics have been widely used in sportswear or the environment of high-temperature and high-humidity due to its good moisture absorption and perspiration speed,which could solve the problem of wearing comfort such as stuffiness and adhesion and could be more beneficial to human health.The moisture absorption and perspiration performance of fabrics is closely related to the moisture transfer process.Therefore,research on the moisture transfer process and the test method of moisture transfer performance of fabrics have received extensive attention.In this paper,the wetting image of fabric was obtained with camera when using the traditional spot method to test the moisture transfer performance of fabrics.First,the image processing method was proposed that could effectively extract the wetting area and characteristic values of the collected fabric wetting image.Then,the appropriate test conditions such as drop height,single drop volume and sampling number were determined and the operation method was standardized by comparing the stability of the results of the wetting area.The curve of wetting area with the increase of time was obtained through the test of dynamic moisture transfer performance of 34 different fabrics.The influence of raw materials,yarns,fabric structure and finishing processes on the moisture transfer performance of fabrics was discussed though the curves to examine the validity of the test method.Finally,the evaluation indexes that represented the dynamic moisture transfer performance of the fabric were extracted based on the dynamic change curve of the fabric wetting area.And the evaluation system based on image technology to test the dynamic moisture transfer performance of the fabric was explored and established.The main conclusions are as follows:(1)The processing method of the wetting image of fabric was determined: Homomorphic filtering and Gaussian filtering were used to preprocess the wetting image of fabric to solve the noise generated in the process of image acquisition and reduce the interference caused by the texture structure to the image segmentation.And then the value of the wetting area could be effectively extracted through threshold segmentation.(2)The test conditions and sampling method of the spot test was optimized: The test liquid can be chosen according to the requirements.When fabrics were tested with this method,under such condition that 40 μL deionized water was used as the test liquid and the drop distance was set as 2 cm and repeated the test 5 times,the results of the wetting areas show good stability.(3)The influence of different factors on the moisture transfer performance of the fabrics shown by the test results was consistent with the existing theory,which proved the validity of the test method: Fibers have greater impact on the moisture transfer performance of fabrics and hydrophilic cellulose fabrics perform excellent moisture transfer performance.Profiled polyester fibers show better moisture transfer performance than ordinary circular cross-section polyester fibers and the moisture conductivity increased as the fiber’s degree of profile increased.There is little difference in the moisture conductivity of polyester fabrics with different spinning methods,but the fluffy vortex spun yarn fabric does show better moisture conductivity than ring spinning and Siro spinning.The yarn fineness,fabric structure and density have greater impact on the moisture conductivity of the fabric.The satin and twill fabrics with lower density have better moisture absorption and moisture conductivity and the high-count and high-density plain or basket weave fabrics have extremely poor moisture conductivity.The hydrophobic finished cotton fabrics shows poor wettability and the fabric was difficult to be wetted when the concentration of the hexadecyltrimethoxysilane increased to 1% and the wetting area was close to zero.(4)The test and evaluation system for the dynamic moisture transfer performance of fabrics was preliminarily formed: The dynamic evaluation indexes including the moisture absorption rate,rapid moisture conduction time,rapid moisture conduction area,wetting time and maximum wetting area can be extracted from the dynamic wetting area-time curve of the fabric.The liquid moisture management performance of 34 different fabrics was test and evaluated refer to the current standard.With reference to the results of the fabric moisture management performance grade,the test and evaluation standard for dynamic moisture transfer performance based on image technology was established.