Molding device of thermoplastic composite material

Abstract

The utility model discloses a forming device of a thermoplastic composite material. Comprising a creel, a fiber positioning device, a yarn spreading positioning observation opening, an ultrasonic yarn spreading device, a fiber width fixing roller set, an infrared preheating device, a melting and dipping device, an upper-layer sizing material unwinding device, a lower-layer sizing material unwinding device, an extruder, a rolling sizing device, an upper-layer sizing material winding device, a lower-layer sizing material winding device and a parallelism adjusting roller which are sequentially arranged. A winding mechanism; the melt impregnation system is provided with a slit runner and a slit mouth mold with an adjustable interval, and an upper-layer sizing material unwinding device and a lower-layer sizing material unwinding device which are arranged above and below the melt impregnation system ensure that the ultrathin prepreg is smoothly pulled out of the mouth mold, so that the preparation of the ultrathin prepreg is realized.

Description

Technical Field

[0001] This invention relates to the field of composite material technology, and in particular to a molding apparatus for thermoplastic composite materials. Background Technology

[0002] It is well known that continuous fiber reinforced thermoplastic composites have significantly higher mechanical properties than short fiber and long fiber reinforced thermoplastic composites due to the continuous nature of their fibers. Because of their superior overall performance, continuous fiber reinforced thermoplastic composites are widely used in aerospace, equipment manufacturing, rail transportation, new energy vehicles, and military industries.

[0003] Chinese invention patent CN114454513A discloses a continuous fiber reinforced thermoplastic resin-based composite material filament forming device. The forming device includes a filament preheating module, a melt impregnation module, and a cooling and winding mechanism. The forming process belongs to melt impregnation. Its difficulty lies in the fact that when preparing ultra-thin prepreg, the fibers are prone to fuzzing and it is difficult to remove the floating fibers from the die, which will eventually lead to production interruption. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing ultrathin prepregs with high design flexibility in prepreg thickness, while avoiding the problem of frequent production interruptions caused by fiber floating when preparing prepregs by traditional powder impregnation, solution impregnation and melt impregnation methods.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a molding device for thermoplastic composite materials, comprising, in sequence, a yarn frame, a fiber positioning device, a yarn spreading and positioning observation port, an ultrasonic yarn spreading device, a fiber width fixing roller group, an infrared preheating device, a melt impregnation device, an upper layer shaping material unwinding device, a lower layer shaping material unwinding device, an extruder, a roller pressing shaping device, an upper layer shaping material winding device, a lower layer shaping material winding device, a parallelism adjustment roller, and a winding mechanism.

[0006] Furthermore, the yarn frame contains fibers; the fibers sequentially pass through a fiber positioning device, a yarn spreading positioning observation port, an ultrasonic yarn spreading device, a fiber width fixing roller group, an infrared preheating device, a melt impregnation device, and a roller pressing and shaping device, and are then wound up by a winding mechanism after passing through a parallelism adjustment roller;

[0007] Furthermore, the melt impregnation device is connected to the extruder;

[0008] Furthermore, the upper-layer shaping material unwinding device has high-temperature resistant shaping material, which sequentially passes through the upper-layer shaping material inlet, the adjustable-spacing slit die, and the upper-layer shaping material winding device.

[0009] Furthermore, the lower-layer shaping material unwinding device has high-temperature resistant shaping material, which sequentially passes through the lower-layer shaping material inlet, the adjustable-spacing slit die, and the lower-layer shaping material winding device.

[0010] Furthermore, after passing through the slit channel, the fibers are trapped between the upper and lower shaping materials and pulled out.

[0011] Furthermore, after the prepreg is pulled out, it passes through a roll forming device and is cooled and shaped; then, the prepreg, upper shaped material, and lower shaped material are separated and wound up.

[0012] The beneficial effects of the present invention are as follows: The molding device for ultra-thin thermoplastic prepreg described in the present invention is equipped with a fiber positioning device, an ultrasonic yarn spreading device, and a fiber width-fixing roller group. Therefore, the gap between the rollers in the fiber positioning device and the fiber spreading width can be flexibly adjusted, thereby enabling the adjustment of fiber content; the fiber content is highly designable.

[0013] Secondly, the inclusion of upper and lower sizing material unwinding devices ensures that the well-impregnated prepreg is encased within the upper and lower high-temperature resistant sizing materials. All three materials pass through the slit die simultaneously, preventing the formation of loose fibers due to resin adhesion. If loose fibers do occur, the small slit gap prevents them from being carried out promptly, leading to an accumulation that ultimately disrupts prepreg production. Therefore, the use of upper and lower sizing material unwinding devices ensures continuous production of ultra-thin prepreg. Attached Figure Description

[0014] Figure 1 This is an overall schematic diagram.

[0015] Figure 2 This is a front sectional view of the melt impregnation apparatus.

[0016] Yarn rack (1), fiber positioning device (2), yarn spreading positioning observation port (3), ultrasonic yarn spreading device (4), fiber width fixing roller group (5), infrared preheating device (6), melt impregnation device (7), slit channel (7-1); upper layer shaping material inlet (7-2); lower layer shaping material inlet (7-3); adjustable spacing slit die (7-4), extruder (8), upper layer shaping material unwinding device (9), roller pressing shaping device (10), upper layer shaping material winding device (11), parallelism adjusting roller (12), winding mechanism (13), lower layer shaping material winding device (14), lower layer shaping material unwinding device (15). Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1 and Figure 2 As shown, the molding apparatus for thermoplastic composite materials of the present invention includes, in sequence, a yarn frame 1, a fiber positioning device 2, a yarn spreading and positioning observation port 3, an ultrasonic yarn spreading device 4, a fiber width-fixing roller group 5, an infrared preheating device 6, a melt impregnation device 7, an extruder 8, an upper-layer shaping material unwinding device 9, a roller pressing shaping device 10, an upper-layer shaping material winding device 11, a parallelism adjusting roller 12, a winding mechanism 13, a lower-layer shaping material winding device 14, and a lower-layer shaping material unwinding device 15.

[0019] The yarn frame 1 has fibers; the fibers pass sequentially through the fiber positioning device 2, the yarn spreading positioning observation port 3, the ultrasonic yarn spreading device 4, the fiber width fixing roller group 5, the infrared preheating device 6, the melt impregnation device 7, the roller pressing and shaping device 10, and after passing through the parallelism adjustment roller 12, they are wound up by the winding mechanism 15.

[0020] In specific applications:

[0021] The yarn frame 1 is used for unwinding the fiber. Specifically, the fiber is one or a mixture of several of carbon fiber, glass fiber, aramid fiber and basalt fiber. In addition, the yarn frame is equipped with an automatic unwinding device, which can self-adjust according to the comprehensive requirements of production speed and fiber tension. The width path of the fiber is set according to the fiber volume content.

[0022] The yarn spreading and positioning observation port 3 is used to observe whether the fiber meets the design requirements;

[0023] The ultrasonic yarn spreading device 4 is used to spread the fibers; after spreading, the fibers enter the infrared preheating device 6 to dry and remove the sizing agent.

[0024] The melt impregnation device 7 is connected to the extruder 8, and the extruder 8 provides the melt impregnation device 7 with a plasticized resin matrix, which is one of PP, PC, PA, PPS and PEEK plastics.

[0025] The upper-layer shaping material unwinding device 9 and the lower-layer shaping material unwinding device 15 are used for unwinding the high-temperature resistant shaping material and are equipped with a tension control system. The high-temperature resistant shaping material is a PI film. The shaping material enters the melt impregnation device 7 from the upper-layer shaping material inlet 7-2 and the lower-layer shaping material inlet 7-3, respectively. After being impregnated through the slit channel 7-1, the fiber passes between the upper and lower shaping materials. Then, a prepreg of a certain thickness can be prepared through the adjustable-gap slit die 7-4. The thickness of the prepreg can be controlled within the range of 0.05mm-0.1mm.

[0026] The roller pressing and shaping device 10 pulls the material out of the slit die 7-4 for cold pressing and shaping, and then separates the high-temperature resistant shaping material and the prepreg. The shaping material is wound up by the upper shaping material winding device 11 and the lower shaping material winding device 14. Finally, the prepreg is wound up by the winding mechanism 13.

[0027] The above description is merely an illustration of preferred embodiments of the present invention, or intended to explain the technical principles of the present invention, and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A molding apparatus for thermoplastic composite materials, characterized in that: It includes a yarn rack (1), a fiber positioning device (2), a yarn spreading and positioning observation port (3), an ultrasonic yarn spreading device (4), a fiber width-fixing roller group (5), an infrared preheating device (6), a melt impregnation device (7), an upper layer shaping material unwinding device (9), a lower layer shaping material unwinding device (15), an extruder (8), a roller pressing shaping device (10), an upper layer shaping material winding device (11), a lower layer shaping material winding device (14), a parallelism adjustment roller (12), and a winding mechanism (13), arranged in sequence.

2. The molding apparatus for thermoplastic composite materials as described in claim 1, characterized in that: The yarn frame (1) has fibers; the fibers pass through the fiber positioning device (2), the yarn spreading positioning observation port (3), the ultrasonic yarn spreading device (4), the fiber width fixing roller group (5), the infrared preheating device (6), the melt impregnation device (7), the roller pressing and shaping device (10) in sequence, and are wound up by the winding mechanism (13) after passing through the parallelism adjustment roller (12).

3. The molding apparatus for thermoplastic composite materials as described in claim 1, characterized in that: The ultrasonic yarn spreading device (4) can spread the fiber to be ultra-thin and wide, and can spread 12K carbon fiber to 25 mm to meet the needs of preparing ultra-thin prepreg.

4. The molding apparatus for a thermoplastic composite material as described in claim 1, characterized in that: The melt impregnation device (7) includes a slit channel (7-1); an upper sizing material inlet (7-2); a lower sizing material inlet (7-3); and an adjustable-gap slit die (7-4). The thickness of the thermoplastic composite prepreg ranges from 0.05 mm to 0.1 mm.

5. The molding apparatus for a thermoplastic composite material as described in claim 1, characterized in that: High-temperature resistant shaping materials are placed on the upper shaping material unwinding device (9) and the lower shaping material unwinding device (15).

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