Device and method for chopped fiber continuous orientation

Abstract

The invention provides a device for chopped fiber continuous orientation. The device comprises a material preparation unit, an orientation device and a separating unit, the material preparation unit is used for mixing complex liquid formed by chopped fiber and dispersion media to obtain chopped fiber suspension liquid and pumping the chopped fiber suspension liquid to the orientation device, the orientation device is a vertical screw conveying device, screw blades are arranged on a threaded rod of the screw conveying device, screw pitches and spiral rise angles of the screw blades are gradually changed, the threaded rod, the screw blades and a sleeve of the screw conveying device are closely matched to form a gradually contractile screw runner, a driving device drives the threaded rod to rotate, the chopped fiber suspension liquid in the gradually contractile screw runner is oriented and conveyed into the lower separating unit, the separating unit is used for receiving and separating the oriented chopped fiber suspension liquid, and pressing and winding are performed after oriented chopped fibers are obtained. The invention further discloses a method for chopped fiber continuous orientation. According to the device, orientation efficiency can be improved, orientation quality is improved, the oriented chopped fibers are long, and the device is suitable for industrial application and popularization.

Description

Technical field [0001] The invention relates to the technical field of chopped fiber recycling, and more specifically to a device and method for continuous orientation of chopped fiber. Background technique [0002] The length of chopped fiber is generally 3-15cm, which has a high degree of anisotropy. Chopped fiber reinforced resin-based composite materials are widely used in aerospace, automotive industry, sports and leisure, wind power and other fields because of their high strength, high specific modulus, corrosion resistance, and excellent thermal stability. The performance of chopped fiber-reinforced resin-based composites is related to the length, content, interfacial properties and orientation of the chopped fibers. Among them, the length and orientation of the fibers are key factors that affect the mechanical properties of fiber-reinforced composites. In recent years, with the widespread use of fiber products, fiber scrap products produced during production and use have...

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Problems solved by technology

V. Timbrell et al. (Journal of Applied Physics, 1972, 43(11), 4839-4840) used a magnetic field for fiber orientation, requiring the fibers to have magnetic conductivity, which limited the types of fibers, and the fiber orientation degree was low and the orientation device was complicated.

Vyakarnam et al. (U.S.Patant 584356) use an electric field for fiber orientation. The orientation process is similar to the magnetic field method, which requires the fiber to have a certain degree of electrical conductivity, which also limits the types of fibers. The fiber orientation degree is low, and fibers with a high degree of orientation cannot be obtained.

Kacir et al. (Polymer Engneering & Science, 1975, 15(7), 525-537) used wet fiber orientation technology for glass fiber orientation, but its preparation was a block fiber mat, which could not achieve large-scale continuous chopped fiber orientation

Chinese invention patent (CN105178090B) proposes a method for preparing chopped fiber oriented mat, which uses tapered fluid to realize fiber orientation, and the fiber length is up to 12mm, and the oriented fiber length is short, so it is impossible to prepare longer fibers with excellent properties Oriented mat; longer recycled fibers before orientation need to be chopped, which increases the process, and this method is limited by the size of the nozzle, and the discharge efficiency is low

[0004] It can be seen that the above methods have problems such as low degree of orientation of chopped fibers and short oriented fibers, which hinders the large-scale and industrialized recycling of recycled fibers

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