Factors affecting the bonding strength of non-woven fabrics

Nonwovens are fabrics that are not woven into a web-like structure and then reinforced by mechanical, thermal bonding or chemical methods. What are the factors affecting the adhesive strength of this nonwoven fabric? Here's our tidying up:
1. Wetting
That is, the adhesive that wets the surface of the adhesive substance is evenly distributed due to the action of intermolecular forces. In general, the contact angle can be used to indicate the degree of wetting of a liquid on a solid surface, and can be used as a three-phase interface point where a liquid droplet, a solid, and a gas contact. It can be seen that the smaller the contact angle, the better the wettability of the non-woven fabric.
2. Diffusion of adhesive
Adhesives for non-woven fabrics also need to have certain diffusion properties. By diffusion, adhesive molecules and some fragments can cross the interface to form a diffuse interface region. Complete wetting, spreading, etc. Facilitates the proximity between the adhesive and the molecules of the material to be bonded. If the distance is less than 0.5 nanometers, molecular attractive forces or binding forces favorable for binding can be generated.
3. Mechanical bonding
Mechanical bonding means that the adhesive penetrates into the pores of the bonded material or between its surfaces, and the bonded material is bonded by the cured adhesive through action (such as an anchor hook or coating behind a fixed phone).
The non-woven fabric is directly spun into a net from polypropylene through thermal bonding, and its strength is better than that of ordinary staple fiber products. The strength is non-directional, and the strength in both vertical and horizontal directions is similar.