The first method is to make the waterproof coating of the tent porous, with a pore size of 200-500 microns, and implant a certain substance in the hole, the implant absorbs expansion when waterproof and blocks the hole, preventing water from passing through the hole Through, when the water is not released, the water shrinks and opens the hole, allowing the air to pass through the hole, so that the knife is waterproof and breathable. However, the pore size is easy to control in the production process. Its pore size range is large, and it has little effect on the waterproof performance and air permeability, because it relies on water expansion to block the pores and shrink the open pores. The effect of pore size on waterproof performance and breathability.
The second is to make the waterproof layer of the tent perforated, and the pore size is less than 100 microns, so that only air can pass through the holes, and no water can pass through the holes, so as to achieve the purpose of waterproof and breathable. However, the pore size of the coating is difficult to control in the production process. For example, if the pore size is too small, the waterproof performance is good, but the air permeability is poor. If the pore size is too large, the waterproof performance is poor, but the air permeability is poor, but the air permeability is good.
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