Do you really know what waterproof is? What is waterproofing?


Time:

2021-02-02

In fact, most people think that anti-splashing water is waterproof, but this is just a literal meaning, the gap between the two is still very big in reality, sometimes because of this detail, it determines whether a waterproof fabric is really waterproof.

Do you really know what waterproof is? What is waterproofing?

In fact, most people think that anti-splashing water is waterproof, but this is just a literal meaning, the gap between the two is still very big in reality, sometimes because of this detail, it determines whether a waterproof fabric is really waterproof.

Protection against water

First of all, let's introduce the anti-splashing water.

In fact, anti splashing water, often written as anti splashing. Anti-splashing water refers to the hydrophobic compounds deposited on the surface of the fiber, the fabric surface has pores, air and water gas can also pass through, generally will form water droplets on the surface of the cloth, but it is not really waterproof. But to reduce the adsorption of water by the fabric, so that water can be "plucked" on the surface of the fabric, water will stay for a long time or will seep into the inside. Anti-splash processing uses various chemical materials to attach a layer of ultra-fine "needle bed" on the surface of the cloth, so that the surface tension of the cloth is less than the cohesive force of water. As a result, water droplets will roll away rather than spread out and soak. If this layer of needle bed structure is flattened or covered by oil, the anti-splashing ability of the fabric will be greatly reduced, and even begin to absorb water. The anti-splashing effect of the fabric will also gradually weaken with washing and long-term use, or even fail.

Let's start with an example:

Wear clothes that are water resistant/splash resistant. When the sky is raining, you can walk in the rain for a few minutes in them, and then you can quickly shake off the water on the surface of your clothes, so your clothes inside may not get wet. But it can also get wet, depending on how much water you drop and how long you stay. If you see an item of clothing that says "Water/splash proof" on its page, don't think you can actually walk in the rain in it. Because the rain can really soak you out.

waterproof

It is coated with a layer of grease, paraffin, rubber or a variety of thermoplastic resin on the surface of the fabric to fill the pores on the surface of the fabric, to achieve the purpose of waterproof, but at the same time the fabric has no air permeability. Now the waterproof treatment often uses waterproof film to prevent the water molecules from going deep, but the film itself is too fragile, so it depends on the table cloth, film, inside mutually cooperate to achieve the waterproof function. The waterproof ability is expressed by the water pressure resistance value, that is, the waterproof cloth with a fixed area blocks the continuous rising water pressure. When the surface oozes the third drop of water, it is the water pressure resistance value of the fabric. Usually, more than 1000mm can achieve the basic waterproof ability.

This kind of fabric is: awning, tent, dam filling, oil dike and other industrial fabric, widely used.