Generally speaking, waterproof fabrics can be mainly divided into two types, namely, water-repellent fabrics and waterproof fabrics. What's the difference between them?
1. Water-repellent fabrics are commonly used in the production of jackets, which have breathable requirements and certain waterproof performance.
This kind of fabric is water-repellent, and a layer of ultra-fine "needle bed" is attached to the surface of the fabric with various chemical materials, so that the tension on the surface of the fabric is less than the cohesion of water, and water droplets fall on the fabric. , instead of spreading out and soaking wet, which is the so-called lotus leaf effect.
Usually our commonly used anti-splashing technologies are PU and E-PTFE film lamination.
PU: It is divided into PU coating and PU pressing technology. It is similar to the technology of umbrella and raincoat. It is slightly more advanced. It uses complete blocking technology and does not deliberately reserve apertures for water vapor to pass through. The air permeability is extremely poor. No.
E-PTFE multi-layer film lamination technology: representative fabrics include Gore-Tex, Event, SympaTex, Neoshell, etc., which are divided into 2 layers, 2.5 layers, and 3 layers. Water molecules in the form of water droplets cannot penetrate the membrane of water molecules in the form of water droplets and gas molecules such as oxygen and nitrogen.
2. Waterproof fabrics, commonly used in waterproof clothing, umbrellas, and outdoor products, refers to making rubber soles on the bottom of the fabrics. Generally, there are two methods: coating and lamination.
Coating is to use dry direct coating or wet coating (solidified coating) and other technologies to apply a coating agent with waterproof and moisture-permeable functions on the surface of the fabric, so that the pores on the surface of the fabric are closed by the coating agent. Or reduced to a certain extent, no matter liquid water, water vapor or air can pass through, so as to obtain a certain waterproof effect.
Lamination is a composite layer of waterproof material behind the surface cloth. In most cases, laminated (film) materials are used, and there are also various treatment forms such as capsule fibers, compact fabrics, and siliconization, and usually in the inner layer of the fabric, that is People often say waterproof membrane.
The waterproof film combines the film with other material fabrics through the pasting process to form a composite fabric. These fabrics used for compounding with the film are not waterproof themselves, such as polyester fiber, nylon, etc., so when we wear waterproof clothing and encounter heavy rain, it is still You will see water seeping into the garment, but the inner layer of the garment is dry, and no water seeps in. This is the effect of the waterproof film in the middle of the composite fabric.
