Method and apparatus for cutting carbon fiber recycled material by twin-screw

Abstract

The application discloses a kind of double screw cutting carbon fiber recycled material method and device, it is mainly formed with cutting channel in the shell interior, the outer edge of shell is respectively equipped with and is linked with the long fiber inlet of cutting channel, the medium length fiber inlet and the short fiber inlet, the end of shell is equipped with and is linked with the outlet of cutting channel, hetero-directional double screw is arranged in the cutting channel of shell, hetero-directional double screw is equipped with two simultaneously rotating screw rods;Therefore, it can be cut into the length of predetermined demand to the various different lengths of carbon fiber after recycling, facilitate the recycling subsequent processing application of carbon fiber, increase practical efficiency in its overall use.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber recycling technology, and in particular to a twin-screw cutting method and apparatus for cutting recycled carbon fiber of various lengths into predetermined lengths, facilitating subsequent processing applications of recycled carbon fiber. Background Technology

[0002] Carbon fiber is a high-strength and high-modulus heat-resistant fiber, mainly composed of carbon atoms with a carbon content between 93% and 95%. It is generally produced by carbonizing a precursor into carbon fibers through thermal decomposition at high temperatures. The materials of the precursor mainly include rayon, polyacrylonitrile (PAN) fiber, and pitch. In order to produce carbon fibers, carbon atoms are bonded together in the crystal. The parallel arrangement of the long axes of the fibers gives the carbon fibers a very high strength-to-volume ratio. Thousands of carbon fibers are bundled together to form a fiber bundle, which can be used alone or woven into fabrics.

[0003] Carbon fiber possesses properties such as high hardness, high strength, light weight, high chemical resistance, high temperature resistance, and low thermal expansion. It is lighter than aluminum but stronger than steel, with a specific gravity of 1 / 4 that of iron and a strength 10 times that of iron. Carbon fiber can be processed into fabrics, felts, mats, belts, paper, and other materials. It is often used as a reinforcing material in combination with other materials such as resins, metals, ceramics, and concrete to form composite materials, making it popular in aerospace engineering, civil engineering, military, racing, and other competitive sports products.

[0004] However, although carbon fiber has many excellent properties and is widely used in many industrial products, its actual use has been found to be expensive due to its high manufacturing cost, resulting in high usage costs. Therefore, how to effectively recycle and reuse waste carbon fiber products has become an important issue.

[0005] Therefore, based on this, and drawing upon years of extensive design, development, and practical manufacturing experience in the relevant industry, the inventor has further researched and improved existing technologies to provide a twin-screw method and apparatus for cutting recycled carbon fiber, aiming to achieve better practical value. Summary of the Invention

[0006] The main objective of this invention is to provide a twin-screw method and apparatus for cutting recycled carbon fiber, which can cut recycled carbon fibers of various lengths into predetermined lengths, facilitating subsequent processing and application of recycled carbon fibers, and increasing its practicality in overall use.

[0007] The main objective and effect of the twin-screw carbon fiber recycling cutting device of the present invention are achieved by the following specific technical means:

[0008] It mainly consists of a housing and counter-rotating twin screws; wherein:

[0009] The housing has a cutting channel inside, and long fiber inlet, medium fiber inlet and short fiber inlet are respectively provided on the outer edge of the housing and connected to the cutting channel. The housing also has an outlet at the end corresponding to the cutting channel and connected to the cutting channel.

[0010] The counter-rotating twin screw is disposed within the cutting channel of the housing, and the counter-rotating twin screw has two screws that rotate inward simultaneously.

[0011] In a preferred embodiment of the twin-screw carbon fiber recycling device of the present invention, the distance between the axis of the long fiber inlet and the end face of the outlet is 750 mm, the distance between the axis of the medium-length fiber inlet and the end face of the outlet is 500 mm, and the distance between the axis of the short fiber inlet and the end face of the outlet is 78 mm.

[0012] In a preferred embodiment of the twin-screw cutting device for recycled carbon fiber of the present invention, the length of each of the two screws of the counter-rotating twin screw is 950 mm.

[0013] In a preferred embodiment of the twin-screw carbon fiber recycling device of the present invention, the diameter of the first end of the two screws of the counter-rotating twin screws near the discharge port is 22 mm, the gap width between the outer diameters of the two screws is 3 mm, the diameter of the second end of the two screws is 18 mm, and the gap width between the outer diameters of the two screws is 8 mm.

[0014] In a preferred embodiment of the twin-screw carbon fiber recycling device of the present invention, the axes of the two screws of the counter-rotating twin screw are arranged in an inclined tapering manner from the first end near the discharge port to the second end.

[0015] The main objective and effect of the twin-screw cutting method for recycled carbon fiber of the present invention are achieved by the following specific technical means:

[0016] It mainly includes the following steps:

[0017] Step A: Divide the carbon fiber material into long fibers with a length of 300mm to 200mm, medium-length fibers with a length of 200mm to 100mm, and short fibers with a length of 100mm to 15mm.

[0018] Step B: Input the long-fiber carbon fiber into the cutting channel connected to the long-fiber inlet of the shell, input the medium-length-fiber carbon fiber into the cutting channel connected to the medium-length-fiber inlet of the shell, and input the short-fiber carbon fiber into the cutting channel connected to the short-fiber inlet of the shell.

[0019] Step C: Drive the two screws of the opposing twin screws set in the cutting channel to rotate inward simultaneously, and adjust the rotation speed of the two screws according to the length of the carbon fiber to be recycled;

[0020] Step D: The carbon fibers of various lengths input into the cutting channel are cut by rotating the two screws inward simultaneously. As the two screws rotate, the carbon fibers are also conveyed to the discharge port at the end of the housing, which is connected to the cutting channel. The carbon fibers cut to the predetermined length are then output from the discharge port.

[0021] In a preferred embodiment of the twin-screw cutting method for recycled carbon fiber of the present invention, the distance between the axis of the long fiber inlet and the end face of the outlet is 750 mm, the distance between the axis of the medium-length fiber inlet and the end face of the outlet is 500 mm, and the distance between the axis of the short fiber inlet and the end face of the outlet is 78 mm.

[0022] In a preferred embodiment of the twin-screw method for cutting recycled carbon fiber, the length of each of the two screws in the counter-rotating twin-screw is 950 mm.

[0023] In a preferred embodiment of the twin-screw method for cutting recycled carbon fiber, the diameter of the first end of each screw of the counter-rotating twin screw near the discharge port is 22 mm, the gap width between the outer diameters of the first ends of the two screws is 3 mm, the diameter of the second end of each screw is 18 mm, and the gap width between the outer diameters of the second ends of the two screws is 8 mm.

[0024] In a preferred embodiment of the twin-screw method for cutting recycled carbon fiber, the axes of the two screws of the counter-rotating twin-screw are arranged in an inclined, gradually tapering shape from the first end near the discharge port to the second end.

[0025] In a preferred embodiment of the twin-screw method for cutting recycled carbon fiber, when both screws of the counter-rotating twin screw rotate at 150 rpm, the length of the recycled carbon fiber is 15 mm to 20 mm.

[0026] In a preferred embodiment of the twin-screw method for cutting recycled carbon fiber, the length of the recycled carbon fiber is 5mm to 10mm when both screws of the counter-rotating twin screw rotate at 300rpm.

[0027] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0028] This invention mainly enables the recycling of carbon fibers of various lengths to be cut into predetermined lengths, facilitating the subsequent processing and application of recycled carbon fibers and increasing their practicality in overall use. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is a partial structural diagram of the present invention.

[0031] Explanation of icon numbers:

[0032] 1. Shell; 11. Cutting channel; 12. Long fiber inlet; 13. Medium-length fiber inlet; 14. Short fiber inlet; 15. Outlet; 2. Opposite-direction twin screws; 21. Screw. Detailed Implementation

[0033] To provide a more complete and clear disclosure of the technical content, objectives, and effects achieved by this invention, please refer to the accompanying drawings and reference numerals. A detailed description follows:

[0034] First, please refer to Figure 1 Structural diagram of the present invention and Figure 2 A partial structural diagram of the present invention shows that the invention includes a housing 1 and counter-rotating twin screws 2; wherein:

[0035] The housing 1 has a cutting channel 11 inside. On the outer edge of the housing 1, there are long fiber inlet 12, medium length fiber inlet 13 and short fiber inlet 14 connected and communicating with the cutting channel 11. At the end of the housing 1, corresponding to the cutting channel 11, there is an outlet 15 connected and communicating with the cutting channel 11. The distance between the axis of the long fiber inlet 12 and the end face of the outlet 15 is 750mm, the distance between the axis of the medium length fiber inlet 13 and the end face of the outlet 15 is 500mm, and the distance between the axis of the short fiber inlet 14 and the end face of the outlet 15 is 78mm.

[0036] The counter-rotating twin screw 2 is disposed within the cutting channel 11 of the housing 1. The counter-rotating twin screw 2 has two screws 21 that rotate inward simultaneously. The length of the two screws 21 is 950 mm. The diameter of the first end of the two screws 21 near the discharge port 15 is 22 mm, and the gap width between the outer diameters of the first ends of the two screws 21 is 3 mm. The diameter of the second end of the two screws 21 is 18 mm, and the gap width between the outer diameters of the second ends of the two screws 21 is 8 mm, so that the axes of the two screws 21 are arranged in an inclined and gradually narrowing shape from the first end to the second end.

[0037] In this way, in operation, the present invention separates the recycled carbon fiber material into long fibers with a length of 300mm to 200mm, medium-length fibers with a length of 200mm to 100mm, and short fibers with a length of 100mm to 15mm. The long fibers (300mm to 200mm) are fed into the cutting channel 11 through the long fiber inlet 12 of the housing 1; the medium-length fibers (200mm to 100mm) are fed into the cutting channel 11 through the medium-length fiber inlet 13 of the housing 1; and the short fibers (100mm to 15mm) are fed into the cutting channel 11 through the short fiber inlet 14 of the housing 1. 1. The two screws 21 of the opposing twin screws 2 rotate inward simultaneously. The rotation speed of the two screws 21 is adjusted according to the length of the carbon fiber to be recycled. When the length of the carbon fiber to be recycled is 15mm to 20mm, the rotation speed of the two screws 21 is controlled at 150rpm. When the length of the carbon fiber to be recycled is 5mm to 10mm, the rotation speed of the two screws 21 is controlled at 300rpm. This allows carbon fibers of various lengths input into the cutting channel 11 to be cut by the simultaneous inward rotation of the two screws 21. As the two screws 21 rotate, the carbon fiber is also conveyed towards the discharge port 15. The carbon fiber cut to the predetermined length is then output from the discharge port 15.

[0038] As can be seen from the above description of the use and implementation of the present invention, compared with the prior art, the present invention can cut recycled carbon fibers of various lengths into predetermined lengths, which facilitates the subsequent processing and application of recycled carbon fibers and increases their practicality in overall use.

Claims

1. A twin-screw cutting device for recycled carbon fiber, characterized in that, It includes a housing and counter-rotating twin screws; wherein: The shell has a cutting channel inside, and the outer edge of the shell is respectively provided with a long fiber inlet, a medium-length fiber inlet and a short fiber inlet connected to the cutting channel. The end of the shell is provided with an outlet connected to the cutting channel. The counter-rotating twin screw is disposed in the cutting channel of the housing. The counter-rotating twin screw has two screws that rotate inward simultaneously. Each screw has a first end and a second end that is set opposite to the first end. The two axes of the two screws of the counter-rotating twin screw are inclined to each other and arranged in a gradually narrowing manner along the direction from the first end to the second end. The first end corresponds to the discharge port of the housing.

2. The twin-screw carbon fiber recycling cutting device according to claim 1, characterized in that, The distance between the axis of the long fiber inlet and the end face of the outlet is 750mm, the distance between the axis of the medium-length fiber inlet and the end face of the outlet is 500mm, and the distance between the axis of the short fiber inlet and the end face of the outlet is 78mm.

3. The twin-screw carbon fiber recycling cutting device according to claim 1, characterized in that, The length of each of the two screws in the anti-directional twin-screw is 950 mm.

4. The twin-screw carbon fiber recycling cutting device according to claim 1, characterized in that, The diameter of the first end of each screw of the counter-rotating twin screw near the discharge port is 22mm, and the gap width between the outer diameters of the two screws is 3mm. The diameter of the second end of each screw is 18mm, and the gap width between the outer diameters of the two screws is 8mm.

5. A method for cutting recycled carbon fiber using a twin-screw extruder, characterized in that, Includes the following steps: Step A: Divide the carbon fiber material into long fibers with a length of 300mm~200mm, medium-length fibers with a length of 200mm~100mm, and short fibers with a length of 100mm~15mm. Step B: Input the long-fiber carbon fiber into the cutting channel connected to the long-fiber inlet of the shell, input the medium-length-fiber carbon fiber into the cutting channel connected to the medium-length-fiber inlet of the shell, and input the short-fiber carbon fiber into the cutting channel connected to the short-fiber inlet of the shell. Step C: Drive the two screws of the counter-rotating twin screws set in the cutting channel to rotate inward simultaneously. Each screw has a first end and a second end set opposite to the first end. The two axes of the two screws of the counter-rotating twin screws are inclined to each other along the direction from the first end to the second end and are arranged in a gradually narrowing shape. The first end corresponds to the discharge port of the shell. Adjust the rotation speed of the two screws according to the length of the carbon fiber to be recycled. Step D: The carbon fibers of various lengths input into the cutting channel are cut by rotating the two screws inward simultaneously. As the two screws rotate, the carbon fibers are conveyed to the discharge port at the end of the housing, which is connected to the cutting channel. The carbon fibers cut to a predetermined length are then output from the discharge port.

6. The method for cutting recycled carbon fiber using a twin-screw extruder according to claim 5, characterized in that, The distance between the axis of the long fiber inlet and the end face of the outlet is 750mm, the distance between the axis of the medium-length fiber inlet and the end face of the outlet is 500mm, and the distance between the axis of the short fiber inlet and the end face of the outlet is 78mm.

7. The method for cutting recycled carbon fiber using a twin-screw extruder according to claim 5, characterized in that, The length of each of the two screws in the anti-directional twin-screw is 950 mm.

8. The method for cutting recycled carbon fiber using a twin-screw extruder according to claim 5, characterized in that, The diameter of the first end of each screw of the counter-rotating twin screw near the discharge port is 22mm, and the gap width between the outer diameters of the two screws is 3mm. The diameter of the second end of each screw is 18mm, and the gap width between the outer diameters of the two screws is 8mm.

9. The twin-screw method for cutting recycled carbon fiber according to claim 5, characterized in that, When both screws of the counter-rotating twin-screw extruder rotate at 150 rpm, the length of the recovered carbon fiber is 15 mm to 20 mm.

10. The method for cutting recycled carbon fiber using a twin-screw extruder according to claim 5, characterized in that, When both screws of the counter-rotating twin-screw extruder rotate at 300 rpm, the length of the recovered carbon fiber is 5 mm to 10 mm.

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