The sources of raw materials for non woven fabric are very diverse. Many polymer materials can be used as raw materials for the production of non woven fabrics. For us, these raw materials represent the bonding effect of different substances. Some materials are nonpolar. When the surface energy is low, when the adhesive is in contact with non woven fabric, the van der Waals force (such as hydrogen bonding force) that can be provided is relatively small.
Good adhesion must be achieved by a combination of forces. At the micro level, the coordination of non woven fabric is a natural defect. In the theory of adhesion, which force is effective and which force is ineffective. Therefore, it determines that its bonding strength needs to be supplemented in other ways, that is, the physical force forms the riveting (mechanical force) state, that is, the shallow surface fibers of non woven fabric penetrate into the surface of the adhesive layer on the micro layer, and then form a good solid connection after the adhesive layer is cured. The connection effect force is greater than the strength of the non woven fabric material itself, Only in this way can we visually show material damage and other bonding effects that meet our expectations. Therefore, under this premise, how to formulate the process.
Non woven fabric after the polymer is extruded and stretched to form continuous filaments, the filaments are laid into a network, and the fiber network is bonded by itself. Thermal bonding. Chemical bonding or mechanical reinforcement turns the fiber mesh into non woven fabric.
In various ways, we first form a very thin mesh structure, then overlay these mesh structures, and finally get the super soft spunbond non woven fabric product we need. So where did the pattern 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 fabric materials through the three-dimensional effect of geometric figures, and provide structural mechanics engineering at the micro level. Second, consider aesthetics and other visual needs.
1.The denser the non woven fabric, the more bonding area it can provide, and the better the effect?
In contrast, under the existing coating process, most non woven fabrics have very large gaps. In the process of testing or production, they often worry about back penetration, and do not consider the lack of penetration effect too much. Therefore, if the material density is high, it is actually necessary to adjust the consideration points of the sizing process and change the source of the main bonding relay to obtain better composite effect.
2.The greater the composite pressure, the better the effect?
In general, the greater the composite pressure, the better the penetration of the adhesive in contact with the loose substrate. However, in practice, it is necessary to observe and evaluate the compression and elastic deformation on the cross section when the material is matched. No excessive pressure and glue penetration.
3.The smaller the material deformation, the better the effect?
Most loose materials show great deformation in the plane, which is caused by the structure of the material itself. At this point, what we need to do is to minimize the vertical and horizontal variables of the material in the machine travel.
The bonding process of non woven fabric can be similar to that of paper and embossed materials. The principle of non mirror treatment of metal materials is very common, but the emphasis is different. At the same time, we need to combine our own products. Operate the equipment. Customer demand, etc. Therefore, the adhesives of non woven fabric and other similar materials are still very different from our traditional composite film adhesives.
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