Pneumatic filamentation device for recycled carbon fiber short fibers

Abstract

This invention relates to a pneumatic filamentation device for recycled carbon fiber short fibers, comprising a short fiber arrangement unit, a double-layer dynamic conveying unit, and an airflow splicing cavity. The airflow splicing cavity sequentially comprises a loose layer, an entangled layer, and a compacted layer along the fiber conveying direction, and each layer has airflow inlets at different angles on its sides. This allows the short fibers to sequentially unfold, interweave, and stably bond under the action of airflow, thereby forming short fibers into long fiber bundles continuously at room temperature without the need for resin bonding or hot pressing. This enhances the application value of recycled carbon fiber in textiles, composite materials, and recycling processes.

Claims

1. A pneumatic filamentation device for recycled carbon fiber short fibers, comprising: a short fiber arranging unit for receiving short fibers and forming a preliminarily arranged fiber bundle along a conveying direction; a double-layer dynamic conveying unit disposed downstream of the short fiber arranging unit for stably conveying the fiber bundle without breaking it apart; and an airflow splicing cavity disposed downstream of the double-layer dynamic conveying unit, which sequentially comprises a loose layer, an entangled layer and a compacted layer along the fiber bundle conveying direction; and airflow inlets at different angles are respectively provided on the sides of the loose layer, the entangled layer and the compacted layer, so that the short fibers sequentially unfold, interweave and stably combine to form a long fiber bundle.

2. The pneumatic filamentation apparatus for recycled carbon fiber staple fibers as described in claim 1, wherein, The short fiber arranging unit includes a feed inlet and a guide channel, which uses directional airflow to arrange the short fibers in a generally parallel manner along the conveying direction.

3. The pneumatic filamentation apparatus for recycled carbon fiber staple fibers as described in claim 1, wherein, The dual-layer dynamic conveying unit includes an upper conveying unit and a lower conveying unit, and the distance between the upper conveying unit and the lower conveying unit is adjustable to control the compactness of the fiber bundle.

4. The pneumatic filamentation apparatus for recycled carbon fiber staple fibers as described in claim 1, wherein, The loose layer also serves as the inlet area of ​​the airflow splicing cavity, containing a loose layer airflow inlet, which is configured at a first angle relative to the fiber bundle delivery direction to promote the loosening of the fiber bundle inlet.

5. The pneumatic filamentation apparatus for recycled carbon fiber staple fibers as described in claim 4, wherein, One of the entanglement layers has its airflow inlet configured at a second angle relative to the fiber bundle transport direction, different from the first angle, so as to form a swirling airflow field within the entanglement layer, causing the short fibers to intertwine and become entangled.

6. The pneumatic filamentation apparatus for recycled carbon fiber staple fibers as described in claim 4, wherein, One of the compaction layers has its airflow inlet configured at a third angle relative to the fiber bundle transport direction, different from the first and second angles, in order to apply compression and stabilization to the interlaced fiber structure.

7. The pneumatic filamentation apparatus for recycled carbon fiber staple fibers as described in claim 1, wherein, The airflow inlet angles of the loose layer, the entangled layer, and the compact layer can be adjusted within the range of 0 to 90 degrees.

8. The pneumatic filamentation apparatus for recycled carbon fiber staple fibers as described in claim 1, wherein, The airflow splicing cavity is either a one-piece molded structure or assembled from multiple modular units in sequence.

9. The pneumatic filamentation apparatus for recycled carbon fiber staple fibers as described in claim 1, wherein, The injection angle and direction of the airflow inlet in the loose layer is 45° clockwise, the injection angle and direction of the airflow inlet in the entangled layer is 30° counterclockwise, or the injection angle and direction of the airflow inlet in the compact layer is nearly parallel to the channel axis.

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