Composite Process Ideas For Macroporous Materials Such As Non Woven Fabric

The raw material sources of non woven fabric are very diverse, and many polymer materials can be used as raw materials for the production of non woven fabrics. For us, these raw materials represent the difference in the bonding effect of different substances, and some materials belong to non woven fabrics. For polar materials, the low surface energy leads to relatively small van der Waals forces such as hydrogen bonding force that can be provided when the adhesive is in contact with the non-woven fabric.

1. How to formulate the process of non woven fabric

The formation of a good bonding effect must be the joint action of a variety of forces. At the micro level, the lamination of non woven fabrics is naturally flawed. In bonding theory, which forces work and which ones do not. Therefore, it is determined that its bonding strength needs to be supplemented by other methods, that is, physical force, to form a riveted (mechanical force) state, that is, at the microscopic level, the superficial fibers of the non-woven fabric are infiltrated on the surface of the adhesive layer. , and then after the adhesive layer is cured, a good solid-state connection is formed. The effect of the connection is greater than the strength of the non woven material itself, so that the material damage and other bonding effects that meet our expectations can be intuitively displayed. So under this premise, how to formulate the process.

2. The production process of non woven fabric

The non woven fabric is after the polymer has been extruded and stretched to form continuous filaments, the filaments are laid into a web, and the web is then subjected to self-bonding, thermal bonding, chemical bonding or mechanical reinforcement methods to make the fiber web. into a non woven fabric.
A very thin net-like structure is first formed by various methods, and then these net-like structures are superimposed to finally obtain the finished non-woven fabric we need. So where do the patterns on the non woven fabric come from? It is formed by post-processing. It has two purposes. One is to deepen the mechanical connection between non-woven materials through the three-dimensional effect of geometric figures, and to provide structural mechanical engineering at the micro level. The second is to take into account visual needs such as aesthetics.

3. Details about the bonding process design of non woven fabric

a. The denser the non woven fabric, the more bonding area it can provide, and the better the effect?
In contrast, most of the non-woven fabrics have very large voids under the existing coating process, and they are often worried about back penetration during testing or production and do not think too much about the insufficient penetration effect. Then, if the material is dense to a high degree, it is actually necessary to adjust the consideration points of the sizing process and switch the source of the main adhesive force to obtain a better composite effect.
b. The greater the compound pressure, the better the effect?
In general, higher compounding pressure will promote better penetration of the adhesive when it contacts loose substrates. However, in actual operation, it is necessary to observe and evaluate the compression and rebound deformation of the cross-section when the materials are attached. It will not cause the phenomenon of excessive pressure and glue penetration.

c. The smaller the deformation of the material, the better the effect?

Most of the loose materials show a large amount of deformation in the vertical and horizontal planes, which is caused by the structure of the material itself. For this, what we need to do is to minimize the vertical and horizontal deformation of the material during the walking stroke.
The bonding process of non woven fabrics can be analogous to paper, embossed materials, and non-mirror-finished metal materials. The commonality in principle is very high, but the focus is different. At the same time, it is necessary to comprehensively consider our own products, operating equipment, and customer needs. Therefore, the bonding of non woven fabrics and other similar materials is quite different from our traditional composite film bonding.