The Multi Axial Structure Of Nonwovens Becomes An Important Trend.

< p > nonwoven composite processing can not only make up for the defects and deficiencies of several composite materials before, but also give the products more excellent new properties.

In the modern nonwovens processing technology, the role and importance of the compound machining is increasing day by day, among which the interlaminar composite technology develops the fastest.

< /p >

< p > the popular interlaminar composite nonwoven materials are divided into two types: rigid interlaminar composite material and flexible interlaminar composite material.

The fabrication of rigid interlaminar composites is a technology for producing composite materials by bonding various composite films or sheets.

A rigid interlaminar composite material is usually formed by bonding several layers of fibrous raw materials with resin.

The flexible interlaminar composite is produced by laminating a layer of fabric with another layer of fabric through thermoplastic resin or thermoplastic film. The flexible laminating also enables the film to be laminated with the fabric, and is bonded to the fabric under the condition of heating and pressing.

< /p >

< p > flame spray lamination must strengthen gas recovery < /p >

< p > at present, because the technology of flame lamination is not very environmentally friendly, the way out is to invest in effective recycling of harmful gas.

< /p >

< p > in the process of laminating, the most rapid and worth mentioning is flame melt lamination.

Flame lamination is a unique lamination process. Its main raw materials are synthetic leather and polyurethane foam.

< /p >

< p > polyurethane foam used mainly in foamed nonwovens for flame lamination. There are two types of polyurethane foam, polyester and polyether.

The modified polyether foam used for flame melt lamination has good adhesion strength, especially excellent anti-aging properties.

However, the technology of flame laminating has not been further developed. The main reason is that this technology is not very environmentally friendly, so the way out is to invest in effective recycling of harmful gas.

< /p >

< p > honeycomb interlayer product flexibility high < /p >

< p > honeycomb laminates made of resin impregnated fabrics have a very high weight to weight ratio. Cotton and glass fiber fabrics can be used as reinforcing materials in this type of laminates.

< /p >

< p > because of the different uses, processing methods and product forms of interlaminar composite products, there are many classification methods for interlayer composite fabrics, which are composed of two layers of composite, three layers of compound, three layers of different layers, and different materials, such as fabrics and fabrics, fabrics and PU foams, fabrics and rubber, fabrics and leather, fabrics and paper, fabrics and nonwovens, fabrics and polytetrafluoroethylene films, nonwoven fabrics and films.

< /p >

Honeycomb laminates made of resin impregnated fabrics have a very high weight to weight ratio. Cotton and glass fiber fabrics can be used as reinforcing materials in this type of P.

For example, waterproofing permeable laminated nonwovens compounded nonwoven fabric with a special thin film by laminating process and become a new type of fabric with waterproof and moisture permeable function.

It not only has outstanding performance, but also has the advantages of wide selection of materials, flexible design and less pollution. It is a main direction of waterproof and moisture permeable products in the future.

< /p >

< p > there are two types of polymer film used in waterproofing permeable laminated nonwovens: one is hydrophilic type, the other is microporous.

The moisture permeation mechanism is similar to that of the microporous coating. The hydrophilic membrane takes advantage of the moisture permeability of the polymer itself, while the microporous membrane diffuses the water vapor in the microporous structure.

Laminated products can successfully solve the contradiction between water pressure and moisture permeability, and have obvious technical advantages.

At present, the most famous product in the world is the Gore-tex fabric of American GORE company.

< /p >

< p > multiaxial structure becomes an important trend < /p >.

< p > nonwovens or fibrous layers are made of randomly distributed fibers, so that the mechanical properties of fabrics in all directions are similar or similar. Therefore, non-woven fabrics have excellent processability for laminated products.

< /p >

< p > woven fabric, knitted fabric and nonwoven fabric can be produced by interlaminar compounding technology.

The fiber used to produce this kind of product should be selected according to the performance characteristics of the product.

Cotton fiber has good strength and relatively low elongation, which is conducive to the production of dimensionally stable rigid laminated products.

Therefore, the use of cotton fiber can make the product obtain good mechanical properties, such as high impact strength, superior adhesion strength, etc.

The nonwoven fabric made of cotton and polyester blended has high strength and can be used to produce laminated lightweight substrates.

However, before applying laminates, cotton fibers must be pre treated to remove slurry and sometimes need to be scoured and bleached.

< /p >

P, in addition, nylon has excellent insulation and high impact strength, it can be used to produce laminated electrical products; acrylic fiber has good aging resistance and acid resistance. In glass fiber reinforced laminating, this fabric can be used as covering layer, and acrylic coating can improve abrasion resistance, chemical corrosion resistance and weather fastness. Polyester has good chemical resistance, weather resistance and wear resistance, and its application in nonwoven laminated products is also gradually expanding. Other fibers, including some new high-performance fibers such as Nuo, Mexes, Kevlar and HDPE, are used in developing some high performance special products, which can significantly improve the protective performance of products. <

< /p >

< p > nonwovens or fibrous layers are made of randomly distributed fibers, so that the mechanical properties of fabrics in all directions are similar or similar. Therefore, non-woven fabrics have excellent processability for laminated products.

The multi axial structure of woven, nonwoven and knitted fabrics is also an important trend in the development of interlaminar composite products.

< /p >