How to balance the waterproof and air permeability of tarpaulin

(Summary description)In general, tarpaulin should be waterproof, but now some customers also require tarpaulin is breathable, for the manufacturer, is a new challenge…

In general, tarpaulin should be waterproof, but now some customers also require tarpaulin is breathable, for the manufacturer, is a new challenge, so how should the waterproof and breathable tarpaulin balance?

There is a certain contradiction in principle between waterproof and air permeability of tarpaulin, because in the production process, a fabric has good waterproof performance, then the corresponding air permeability is poor; If the ventilation performance is good, then the waterproof performance is poor.
So in order to solve this problem, tarpaulin manufacturers consider the tarpaulin waterproof coating made with holes, the size of the aperture is 200-500 microns, and implant a substance in the hole, the implant in the waterproof absorption expansion blocked the hole, to prevent water from passing through the hole, in fine weather when the water contraction open the hole, let the gas through the hole, so as to achieve the purpose of waterproof and breathable.

In addition, there is also a way to make the waterproof layer of the tarpaulin with holes, the aperture size is less than 100 microns, only let the gas pass through the hole, and do not let the water pass through the hole, which is also OK. However, the relative price of this kind of tarpaulin is also higher, which is more suitable for customers with greater demand and good economic conditions.