There are many factors that influence the water resistance and moisture permeability of fabrics. Thus, the problems of the material itself and the production process and technical problems of the textile process will all be affected. The waterproof index of waterproof and moisture-permeable fabrics depends on the following factors:
1. The thickness of the fabric
The thicker the fabric, the greater the moisture resistance and the greater the water pressure resistance.
2. The thickness of the yarn
For the compact fabric woven from fibers with good hygroscopicity, the radius of the yarn can be reduced due to the capillary effect. Water resistance.
3. The tightness of the fabric
The increase in the distance between the yarns directly affects the water pressure resistance. In general, the tighter the fabric structure, the better the water resistance.
4. The pore size of the coating film
The larger the pore sizeof the film, the worse the hydrostatic pressure resistance of the coated fabric.
5. The size of the contact angle
At 0>90°, the fabric has water repellency, at this time, as the angle increases, the water pressure resistance of the fabric also increases.
6. Layer thickness
If the coating is too thin, the coating agent is not easy to form a continuous film on the surface, and the water pressure resistance of the coated fabric is reduced
, the coating is thick and the water pressure resistance of the fabric is improved.
7. The performance of warp and weft yarns
Under the action of water pressure, warp and weft yarns with good elasticity are easy to elongate, resulting in the formation of gaps between adjacent warps - and weft yarns, water droplets It penetrates more easily, so that the water pressure resistance of the fabric decreases.
8. Coating quality
HIt is required that the entire cloth surface is uniform and has a certain fastness. The better the quality of the coating, the better the water resistance.
The fabric hydrostatic pressure tester is used for testing medical clothing, compact fabrics, such as canvas, tarpaulin, tarpaulin, tent cloth, waterproof It is an independent company owned by QINSUN developed and produced test device to evaluate the waterproof and moisture permeability performance of fabrics such as rainwear fabrics and other materials. sales service.
GB 19082-2009 Technical requirements for disposable medical clothing 5.4.1 Water resistance
GB 4744-1997 Water resistance of textile fabrics Determination of hydrostatic pressure test p>
GB 4744-2013 water permeability tester for textiles
AATCC 127, ISO 16603, YYT 0700