The hottest continuous discontinuous fiber composi

2022-08-05
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Continuous/discontinuous fiber reinforced composites

because thermoplastics can be used to form devices of various sizes and functions, they are widely used in many industries. However, structural members require higher strength, which needs to be provided by fiber reinforced plastics. Fiber reinforced thermoplastics, which are used to replace metals in automobiles, require even higher strength and stiffness to reduce weight, but the random distribution of fibers in composites has some limitations. When continuous fiber reinforced thermoplastics are used, there is a manufacturing process problem of forming complex shapes and structures

to this end, Pepin associates of the United States has developed a solution called discotex, which is a tow and its fabric composed of discontinuous fibers and continuous fibers. Because it can be stretched in the reinforcement direction, it has better molding performance than continuous fiber products. This material can be made of glass fiber, carbon fiber, quartz fiber or ceramic fiber

the company used discotex material composed of E glass fiber and polyethylene terephthalate (PET) fiber to make a kind of automobile bumper parts. PET fiber is spun from recycled soft drink bottles (100% post consumer waste bottles). The use of this material has proved that the waste that can be taken everywhere can be recycled to make valuable parts in the automotive industry

the forming process of composite products is: pressurize the elastic bag, press the layer against the female mold wall, and consolidate the layer. Pet melts and soaks glass fiber. The excellence of the product is that discontinuous glass fiber is used in the circumferential direction of the product. In contrast, if continuous fibers are used in the circumferential direction, it is difficult to make the ply enrich the corners of the product

the company is currently manufacturing a kind of tow composed of discontinuous carbon fiber segments and continuous nylon tow, which is called CD tow

this material containing discontinuous fibers is more convenient for Prof. Guo to tell us to shape products with complex shapes. The feature that it can stretch in the enhancement direction can save forming time by avoiding poisoning and losing data. For example, discotex fabric plies pre impregnated with epoxy resin can be stretched into hemispherical shapes, which reduces or even eliminates cutting and laying operations. The military aircraft parts manufactured by tex, an intelligent factory built by disco, reduce the total cost by 35% compared with the parts manufactured by continuous fiber

no matter what industry, the production of commercial products requires speed and efficiency. Pultrusion is an ideal production method for fiber reinforced thermoplastic products with constant cross-section. However, the process of drawing continuous fibers through the mold to compress the material may not be suitable for structures with reinforcing fibers in the circumferential direction. Discotex material is also a solution here. Using CD tow as pultrusion material can improve the production speed of pultrusion products with reinforcing materials in the circumferential direction

after weaving CD tow into fabric, the production time of products with complex shapes can also be shortened by containing discontinuous carbon fibers in the thermoplastic matrix

note: the source of this reprint is indicated. It is reprinted for the purpose of transmitting more information. It does not mean that it agrees with its view or confirms the authenticity of the content that advanced polymer composites can be widely used in automotive, aerospace, marine and energy fields

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