Analysis of excellent properties of honeycomb laminated nonwovens
The lamination and finishing of non-woven materials can not only make up for the defects and shortcomings of the previous lamination materials, but also give the product more and better new properties. In modern nonwoven finishing technology, the role and importance of lamination finishing is increasing day by day, among which the interlayer lamination process is developing rapidly.
At present, the more popular interlayer laminate nonwoven materials are divided into two types: “rigid interlayer laminate materials” and “flexible interlayer laminate materials”. Rigid interlayer laminate finishing is a technology that produces laminated material products by bonding individual combined films or sheets. Usually several layers of fibrous raw materials are bonded together with resin to create a rigid interlayer laminate material of the required thickness. Flexible interlayer lamination materials are produced by laminating one layer of fabric to another layer of fabric using thermoplastic resin or thermoplastic film. Flexible lamination can also laminate films and fabrics and bond them under the conditions of heating and pressure. onto the fabric.
Flame lamination must strengthen gas recovery
At present, because flame fusion lamination technology is not very environmentally friendly, the way out is to invest in recycling equipment that can effectively solve harmful gases.
Among the finishing methods of the lamination and lamination process, the one that is progressing rapidly and worth mentioning is flame lamination. Flame fusion lamination is a unique lamination process whose main raw materials are synthetic leather base fabric and polyurethane foam.
The polyurethane foam mainly used in flame-melt laminate foam nonwoven materials has two types: polyester type and polyether type. The modified polyether foam used for flame melt lamination has good bonding strength and excellent anti-aging properties. However, currently flame fusion lamination technology has not made greater progress, mainly because this technology is not very environmentally friendly, so the way out is to invest in recycling equipment that can effectively solve harmful gases.
Honeycomb interlayer products have high sensitivity
Cellular laminated nonwovens made from resin-impregnated fabrics have a high strength-to-weight ratio, and cotton and fiberglass fabrics can be used as reinforcements in this type of lamination.
Because interlayer laminated products have different uses, finishing methods, product forms, etc., interlayer laminated fabrics have many classification methods, including two-layer lamination, three-layer lamination, and three or more layers with different numbers of layers. Lamination also includes lamination between different materials, such as fabric and fabric, fabric and PU foam, fabric and rubber, fabric and leather, fabric and paper, fabric and nonwoven fabric, fabric and PTFE membrane, non-woven fabric Lamination of woven fabrics and films, etc.
Cellular laminated nonwovens made from resin-impregnated fabrics have a high strength-to-weight ratio. Cotton and fiberglass fabrics can be used as reinforcements in this type of lamination. For example, water-blocking and permeable laminated non-woven fabrics are made by laminating non-woven fabrics and a layer of special film together through a lamination process to become a new type of fabric with water-blocking and breathable functions. Not only does it have outstanding performance, but it also has the advantages of a wide range of material selection, sensitive design, and less pollution in terms of process technology. It is a major direction for water-repellent and breathable products in the future.
There are two types of polymer films used in this water-repellent permeable laminated nonwoven fabric: one is hydrophilic type; the other is microporous type. Its breathability mechanism is similar to that of microporous PU coating. The hydrophilic film uses the breathability of the polymer itself, while the microporous film uses the diffusion of water vapor in the microporous structure. Laminated products can successfully solve the contradiction between water pressure resistance and air permeability, and have obvious technical advantages. The most famous product in the world at present is the Gore-tex fabric of the American GORE company.
Multi-axial structures have become an important trend
Nonwoven fabrics or fiber layers are made of randomly distributed fibers, which can make the mechanical properties in all directions in the plane of the fabric the same or similar. Therefore, nonwoven fabrics have excellent finishing properties when used in laminated products.
Woven fabrics, knitted fabrics and nonwoven fabrics can all use interlayer lamination finishing technology to produce laminated fabrics. The fibers used in the production of such products must be selected based on the performance characteristics of the product. Cotton fibers have good strength and relatively low extensibility, which facilitates the production of dimensionally stable rigid laminates. Therefore, the use of cotton fiber can enable the product to obtain good mechanical properties, such as high impact strength, superior bonding strength, etc. Nonwoven fabrics made from cotton and polyester blended chemical fiber fabrics have high strength and can be used to produce laminated light and thin base fabrics. However, before cotton fibers are used for lamination, they must be pre-treated to remove slurry, and sometimes scouring, bleaching and finishing are required.
In addition, nylon has excellent insulation and high impact resistance, and can be used to produce laminated electrical products; polyacrylonitrile fiber has better aging resistance and acid resistance, and is used in glass fiber reinforced lamination. The fabric can be used as a covering layer. Covering with polyacrylonitrile fiber can improve abrasion resistance, chemical corrosion resistance and weather fastness; polyester has good chemical resistance, weather resistance and abrasion resistance, which is used in non-woven lamination The application scope of products is also gradually expanding; other fibers include newly developed high-performance fibers, such as Nomex, Kevlar, high-density polyethylene, etc., which can be used when developing certain high-performance extraordinary products. Significantly improve the protective performance of the product.
Nonwoven fabrics or fiber layers are made with randomly distributed fibers so thatIn order to make the mechanical properties in all directions in the plane of the fabric the same or similar, so the non-woven fabric has excellent finishing properties when used in laminated products. Multi-axial structures combining woven, nonwoven and knitted fabrics are also an important trend in the development of inter-layer lamination products.
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