How to balance the waterproofness and breathability of tarpaulins

Normally, tarpaulins should be waterproof, but now some customers also require tarpaulins to be breathable, which is a new challenge for manufacturers. How to balance the waterproofness and breathability of tarpaulins? ? In principle, there is a certain contradiction between the waterproofness and air permeability of tarpaulins, because in the production process, if a fabric has good waterproof performance, its air permeability is correspondingly poor; If the performance is good, then its waterproof performance is poor. So in order to solve this problem, the tarpaulin manufacturer considers making the waterproof coating of the tarpaulin porous, with a pore size of 200-500 microns, and implanting a certain substance in the hole, and the implant absorbs swelling and blocking when waterproof. Stop the hole to prevent water from passing through the hole, and when the weather is fine, the water will shrink and open the hole, allowing the air to pass through the hole, so as to achieve the purpose of waterproof and breathable. In addition, another method is to make the waterproof layer of the tarpaulin with holes, 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, which is also possible. However, the price of this type of tarpaulin is relatively higher, and it is more suitable for customers with difficult needs and good economic conditions.
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