Post-coating mold and melt impregnation mold system

Abstract

The utility model discloses a post-coating mould and melt impregnation mould system, belongs to continuous fiber reinforced thermoplastic resin composite material processing technical field, the post-coating mould comprises an intermediate body, a fiber feeding core rod and a shaping sleeve, the fiber feeding core rod comprises a cylindrical main body and a conical outlet in sequence, the intermediate body is arranged on the cylindrical main body in a surrounding manner; an internal channel of the shaping sleeve sequentially comprises a second conical section and a second straight section, and a conical outlet of the fiber inlet core rod is positioned in the second conical section, so that a coating mold cavity is formed between the second conical section and the conical outlet; a feeding port is formed in the middle body, an annular flow channel communicated with the feeding port of the middle body is arranged on the cylindrical main body of the fiber inlet core rod, at least two spiral flow channels communicated with the annular flow channel are arranged on the outer surface of the conical outlet, and the spiral flow channels are distributed in a circumferential array mode. According to the utility model, the single-side impact pressure on the fiber bundle can be effectively avoided, the coating effect of molten resin is improved, and the roundness of the wire is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of continuous fiber reinforced thermoplastic resin composite material processing, in particular to a post-coating mold and a melt impregnation mold system. Background Art

[0002] Continuous fiber reinforced thermoplastic resin-based composites are high-performance composites made of thermoplastic resin as matrix material and continuous fiber as reinforcement material through various composite molding processes. Continuous fiber reinforced thermoplastic composites make up for the limitations of fiber length and fiber continuity on the performance of composites. With its excellent mechanical properties and mechanical properties, it is widely used in aerospace, transportation, medical equipment, power engineering, industrial manufacturing, building materials and other industries.

[0003] The more common preparation processes for continuous fiber reinforced thermoplastic resin composites currently include melt impregnation process, solution pre-impregnation process, powder impregnation process and mixed yarn impregnation process. Among them, the more commonly used is the melt impregnation process, which utilizes the characteristics of thermoplastic resin melting when heated, uses an extruder to extrude the molten thermoplastic resin into a heated and heat-insulated mold, and the continuous fiber uses a traction device to provide tension through the mold cavity filled with thermoplastic resin melt. Under the combined action of tension and pressure, the fiber yarn spreading (highly bundled fibers are dispersed and spread into a loose state by various means, which can also be called fiber opening or bundle opening) impregnation is achieved. The core of the melt impregnation process is the fiber yarn spreading and impregnation. The designs of different structures and shapes of existing impregnation molds are all for improving the dispersion degree of fibers and the impregnation effect of fibers. Common designs include curved impregnation flow channel molds, resin split jet impregnation molds, and adjustable wrapping angle slit roller impregnation molds. The mold structure and shape design is one of the most core influencing factors of the thermoplastic resin melt impregnation process, but there are some problems with the existing public impregnation mold designs.

[0004] Invention patent application CN114434672A discloses an impregnation mold, an impregnation method and a manufacturing system including the impregnation mold. Referring to Figure 9 of the application specification, it discloses a molding mold (i.e., a post-coating device), which is composed of a core, a jacket, and a jacket mouth template. The core is located inside the jacket and forms a cavity with the jacket. The resin mixture can enter the cavity from the top of the jacket. This easily causes the molten resin to flow into the cavity in one direction, causing a unilateral impact pressure on the fiber bundle after the impregnation treatment, making the pressure distribution in the cavity uneven and the coating effect of the molten resin poor. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a post-coating mold and a molten impregnation mold system which can effectively avoid unilateral impact pressure on a fiber bundle and improve the molten resin coating effect.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] On the one hand, a post-cladding mold is provided, comprising an intermediate, a fiber-feeding core rod and a shaping sleeve, wherein:

[0008] The fiber-introducing core rod comprises a cylindrical main body and a conical outlet in sequence, and the intermediate body is arranged around the cylindrical main body;

[0009] The internal channel of the calibrating sleeve includes a second tapered section and a second straight section in sequence, and the tapered outlet of the fiber core rod is located in the second tapered section, so that a coating mold cavity is formed between the two;

[0010] The intermediate body is provided with a feed port, the cylindrical body of the fiber feed core rod is provided with an annular flow channel connected to the feed port of the intermediate body, and the outer surface of the conical outlet is provided with a spiral flow channel connected to the annular flow channel. The number of the spiral flow channels is at least two and they are distributed in a circular array.

[0011] Furthermore, the diameter of the spiral flow channel is 1 mm-5 mm;

[0012] And / or, the diameter of the annular flow channel is consistent with the diameter of the extruder die, which is 1mm-3mm.

[0013] Furthermore, the internal passage of the fiber inlet core rod includes a third conical section / cylindrical section and a third straight section in sequence, wherein:

[0014] The maximum opening diameter of the third conical section / the diameter of the cylindrical section is 5 mm-15 mm;

[0015] And / or, the third tapered section and the third straight section transition smoothly;

[0016] And / or, the length of the third straight section is 10 mm-40 mm;

[0017] And / or, the third straight section is designed as a circular hole with a hole diameter ranging from 1 mm to 50 mm;

[0018] And / or, the fiber-inlet core rod is fixed to the front surface of the intermediate body by an inlet flange.

[0019] Furthermore, the diameter of the maximum opening of the second conical section is 10 mm-50 mm;

[0020] And / or, the length of the second tapered section is 5 mm-50 mm;

[0021] And / or, the length of the second straight section is 10 mm-30 mm;

[0022] And / or, the diameter of the second straight section is 5 mm-20 mm;

[0023] And / or, the shaping sleeve is fixed to the rear surface of the intermediate body by an outlet flange.

[0024] Furthermore, a shaping sleeve is provided in the second straight section, and a shaping hole is provided in the shaping sleeve, wherein:

[0025] The shaping sleeve is fixed in the second straight section by threaded connection, and the thread length on the surface of the shaping sleeve is 5mm-50mm;

[0026] And / or, the diameter of the shaping hole is 1 mm-20 mm;

[0027] And / or, the length of the shaping sleeve is 10 mm-50 mm;

[0028] And / or, the aspect ratio of the shaping hole is 5-30.

[0029] Furthermore, the rear cladding mold further comprises a yarn guide plate located in front of the fiber inlet of the fiber inlet core rod, and the yarn guide plate is provided with a yarn guide hole, wherein:

[0030] The yarn guide holes are distributed in a circular or rectangular array;

[0031] And / or, both ends of the yarn guide hole are chamfered;

[0032] And / or, the number of the yarn guide holes is greater than or equal to the number of the fiber bundle strips to be coated.

[0033] On the other hand, a melt impregnation mold system is provided, comprising a fiber pre-dispersing device, a melt impregnation die head, a cooling device, a rear coating mold and a traction device connected in sequence, wherein the rear coating mold is the above-mentioned rear coating mold.

[0034] Furthermore, the fiber pre-dispersing device includes at least three fixed shafts arranged at equal intervals laterally, each fixed shaft is provided with a dispersion roller, the axis of the dispersion roller is spaced a preset distance from the corresponding fixed shaft, the dispersion roller is connected to the corresponding fixed shaft with the corresponding fixed shaft as the center and with an adjustable angle, and the fixed shaft is provided with a dispersion roller angle adjustment device.

[0035] Furthermore, the diameter of the dispersion roller is 30 mm to 120 mm;

[0036] And / or, the dispersion roller angle adjustment device is provided with a compass for recording the dispersion roller angle;

[0037] And / or, a heating rod and a thermocouple are provided inside the dispersion roller, and the temperature of the dispersion roller after heating is 80° C.-240° C.;

[0038] And / or, the dispersion roller is provided with a pressure sensor for detecting the tension of the fiber bundle.

[0039] Furthermore, the thermoplastic resin used in the melt impregnation die and the post-coating mold is selected from polyethylene, polypropylene, nylon, polyetheretherketone, polyester, and polyurethane;

[0040] and / or, the molecular weight and viscosity of the thermoplastic resin used in the melt impregnation die are lower than the molecular weight and viscosity of the thermoplastic resin used in the post-coating mold;

[0041] And / or, the melt impregnation mold system is used to manufacture a continuous fiber reinforced thermoplastic resin composite material, wherein the continuous fiber is a bioactive glass fiber;

[0042] And / or, the traction speed of the traction device ranges from 1 m / min to 100 m / min.

[0043] The utility model has the following beneficial effects:

[0044] The utility model has a rear coating mold, an intermediate body provided with a feed port, a cylindrical main body of a fiber inlet core rod provided with an annular flow channel connected with the feed port of the intermediate body, and an outer surface of a tapered outlet provided with a spiral flow channel connected with the annular flow channel. Compared with the rear coating mold in the prior art, the outer surface of the fiber inlet core rod of the rear coating mold is provided with an annular flow channel and a plurality of spiral flow channels. During the rear coating, the molten resin can enter the spiral flow channels in various directions through the annular flow channel respectively, which can effectively prevent the molten resin from unidirectionally flowing into the coating mold cavity and causing unilateral impact pressure on the fiber bundle after the impregnation treatment, so that the pressure distribution in the coating mold cavity is more uniform, thereby improving the coating effect of the molten resin and the roundness of the wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the cross-sectional structure of the rear covering mold of the utility model;

[0046] Figure 2 for Figure 1 AA partial cross-sectional view;

[0047] Figure 3 It is a schematic diagram of another structural form of the fiber core rod in the utility model;

[0048] Figure 4 It is a schematic diagram of the overall structure of the melt impregnation mold system of the utility model; DETAILED DESCRIPTION

[0049] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0050] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0051] On the one hand, the utility model provides a rear coating mold 3, such as Figure 1-3 As shown, it includes an intermediate body 32, a fiber core rod 33 and a shaping sleeve 34, wherein:

[0052] The fiber-inlet core rod 33 includes a cylindrical body 331 and a conical outlet 332 in sequence, and the intermediate body 32 is arranged around the cylindrical body 331;

[0053] The internal passage of the calibrating sleeve 34 includes a second tapered section 341 and a second straight section 342 in sequence, and the tapered outlet 332 of the fiber core rod 33 is located in the second tapered section 341, so that a coating mold cavity 35 is formed between the two.

[0054] The intermediate body 32 is provided with a feed port 321 (for connecting with the discharge port of the extruder, and the molten resin enters the coating mold cavity 35 through the feed port 321), the cylindrical body 331 of the fiber inlet core rod 33 is provided with an annular flow channel 333 connected with the feed port 321 of the intermediate body 32, and the outer surface of the conical outlet 332 is provided with a spiral flow channel 334 connected with the annular flow channel 333 (that is, the spiral flow channel 334 connects the annular flow channel 333 and the coating mold cavity 35), and the number of the spiral flow channels 334 can be 1-5, preferably at least two and distributed in a circular array.

[0055] When in use, the filament (the impregnated fiber bundle) passes through the fiber core rod 33 and the shaping sleeve 34 of the rear coating mold 3 in sequence, the feed port 321 on the intermediate body 32 is connected to the discharge port of the extruder, and the molten resin enters the coating mold cavity 35 between the shaping sleeve 34 and the fiber core rod 33 through the feed port 321, and the filament is coated and formed when passing through the coating mold cavity 35.

[0056] The utility model has a rear coating mold, an intermediate body provided with a feed port, a cylindrical main body of a fiber inlet core rod provided with an annular flow channel connected with the feed port of the intermediate body, and an outer surface of a tapered outlet provided with a spiral flow channel connected with the annular flow channel. Compared with the rear coating mold in the prior art, the outer surface of the fiber inlet core rod of the rear coating mold is provided with an annular flow channel and a plurality of spiral flow channels. During the rear coating, the molten resin can enter the spiral flow channels in various directions through the annular flow channel respectively, which can effectively prevent the molten resin from unidirectionally flowing into the coating mold cavity and causing unilateral impact pressure on the fiber bundle after the impregnation treatment, so that the pressure distribution in the coating mold cavity is more uniform, thereby improving the coating effect of the molten resin and the roundness of the wire.

[0057] The diameter of the spiral flow channel 334 can be 1mm-5mm, specifically 2mm-4mm, such as 2.5mm, 3mm, 3.5mm, etc. The diameter of the annular flow channel 333 can be consistent with the diameter of the extruder die, and can be 1mm-3mm, such as 1.5mm, 2mm, 2.5mm, etc.

[0058] The inner channel of the fiber core rod 33 may include a third tapered section 336 and a third straight section 337 ( Figure 1 Alternatively, the internal passage of the fiber core rod 33 may include a cylindrical section 338 and a third straight section 337 ( Figure 3 The third tapered section 336 and the third straight section 337 can have a smooth transition to alleviate the breakage of the fiber bundle caused by mechanical friction; the length of the third straight section 337 can be 10mm-40mm, specifically 15mm-30mm, such as 18mm, 22mm, 27mm, etc.; the third straight section 337 can be designed as a round hole with an aperture range of 1mm-50mm, such as 10mm, 20mm, 30mm, etc.; the fiber core rod 33 can be fixed on the front surface of the intermediate body 32 by the inlet flange 36, and the fiber core rod 33 of different specifications can be disassembled and replaced as needed, and the coating mold cavity 35 can be quickly disassembled and cleaned when broken yarn or wool yarn occurs.

[0059] The diameter of the maximum opening of the second tapered section 341 of the shaping sleeve 34 can be 10mm-50mm, specifically 20mm-50mm, such as 25mm, 30mm, 40mm, etc.; the length of the second tapered section 341 can be 5mm-50mm, specifically 10mm-40mm, such as 25mm, 30mm, 35mm, etc.; the length of the second straight section 342 can be 10mm-30mm, specifically 15mm-30mm, such as 20mm, 25mm, 28mm, etc.; the diameter of the second straight section 342 can be 5mm-20mm, that is, to ensure that the melt inlet angle range is 20°-180°, specifically 45°-120°; the shaping sleeve 34 can be fixed to the rear surface of the intermediate body 32 by the outlet flange 37, and the shaping sleeve 34 can be quickly disassembled by disassembling the outlet flange 37. The outlet flange 37, the inlet flange 36 and the outer peripheral surface of the intermediate body 32 may be provided with a heating plate 38 to heat the coating mold so as to maintain the resin in the coating mold cavity 35 at a suitable temperature and improve the post-coating effect.

[0060] In order to improve the wire forming effect, a shaping sleeve 39 may be provided in the second straight section 342 of the shaping sleeve 34, and a shaping hole 391 may be provided in the shaping sleeve 39. At this time, the aperture of the shaping hole 391 may be 1mm-20mm, specifically 2mm-10mm; the length of the shaping sleeve 39 may be 10mm-50mm, specifically 10mm-30mm, that is, the aspect ratio of the shaping hole 391 is ensured to be within the range of 5-30, specifically 10-20. The shaping sleeve 39 may be fixed in the second straight section 342 by threaded connection, and the thread length on the surface of the shaping sleeve 39 may be 5mm-50mm, specifically less than or equal to the length of the shaping sleeve 39.

[0061] To facilitate the feeding of the filaments, the rear coating mold 3 may further include a yarn guide plate 31 located in front of the fiber inlet of the fiber inlet core rod 33, and the yarn guide plate 31 is provided with yarn guide holes 311. The yarn guide holes 311 may be distributed in a circular or rectangular array; both ends of the yarn guide holes 311 may be chamfered to alleviate the yarn breakage caused by mechanical friction of the fiber bundle; the number of yarn guide holes 311 may be greater than or equal to the number of fiber bundle strips to be coated.

[0062] On the other hand, the utility model provides a melt impregnation mold system for manufacturing continuous fiber reinforced thermoplastic resin composite materials, such as Figure 4 As shown, it includes a fiber pre-dispersing device 2, a melt impregnation die head 1, a post-coating die 3, a cooling device (not shown) and a traction device (not shown) connected in sequence, and the post-coating die 3 is the post-coating die 3 mentioned above, and the structure is the same as above, which will not be repeated here. The reference numeral 4 in the figure is a continuous fiber bundle.

[0063] The utility model discloses a melt impregnation mold system, comprising a rear coating mold, a feed port is arranged on the intermediate body of the rear coating mold, an annular flow channel connected with the feed port of the intermediate body is arranged on the cylindrical body of the fiber inlet core rod, a spiral flow channel connected with the annular flow channel is arranged on the outer surface of the conical outlet, compared with the rear coating mold in the prior art, an annular flow channel and a plurality of spiral flow channels are arranged on the outer surface of the fiber inlet core rod of the rear coating mold, during the rear coating, the molten resin can enter the spiral flow channels in various directions through the annular flow channel respectively, which can effectively prevent the molten resin from flowing into the coating mold cavity in one direction and causing a unilateral impact pressure on the fiber bundle after the impregnation treatment, so that the pressure distribution in the coating mold cavity is more uniform, the coating effect of the molten resin is improved, and the roundness of the wire is improved.

[0064] The fiber pre-dispersing device 2 can be in various forms that can be easily thought of by those skilled in the art. The present invention preferably adopts the following structural form:

[0065] like Figure 4 As shown, the fiber pre-dispersing device 2 includes at least three fixed shafts 21 (specifically, there may be 4-6, and the example in the figure shows 5) arranged at equal intervals in the horizontal direction, and each fixed shaft 21 is provided with a dispersion roller 22, the axis of the dispersion roller 22 is spaced a preset distance from the corresponding fixed shaft 21, and the dispersion roller 22 is connected to the corresponding fixed shaft 21 with the corresponding fixed shaft 21 as the center and the angle can be adjusted, and the fixed shaft 21 is provided with a dispersion roller angle adjustment device. In specific implementation, the dispersion roller 22 can be set with the corresponding fixed shaft 21 as the center through a rigid member, and the dispersion roller angle adjustment device can drive the fixed shaft 21 to rotate through a worm gear, and the fixed shaft 21 then drives the corresponding dispersion roller 22 to rotate through the rigid member. In this way, the position and angle of each dispersion roller 22 can be flexibly adjusted through the dispersion roller angle adjustment device, so the fiber pre-dispersing device 2 has a good dispersion effect on the continuous fiber bundle 4.

[0066] The diameter of the dispersion roller 22 can be 30mm-120mm, specifically 40mm-100mm, such as 50mm, 60mm, 70mm, etc., which can be flexibly selected according to usage requirements; the dispersion roller angle adjustment device can be provided with a compass 23 for recording the angle of the dispersion roller 22, so that the adjustable angle range of the dispersion roller 22 is 0°-360° and there is a compass scale to record the angle, and the dispersion roller 22 can rotate in a circle in the forward and reverse directions; the interior of the dispersion roller 22 can be provided with a heating rod and a thermocouple to preheat the continuous fiber bundle 4 and improve the subsequent impregnation and coating effect; the temperature of the dispersion roller 22 after heating can be 80℃-240℃, such as 100℃, 150℃, 200℃, etc.; the dispersion roller 22 can be provided with a pressure sensor for detecting the tension of the fiber bundle, and the corresponding tension can be read through the scale of the compass 23.

[0067] In the utility model, the thermoplastic resin used in the melt impregnation die 1 and the rear coating die 3 can be selected from polyethylene, polypropylene, nylon, polyetheretherketone, polyesters including polyethylene terephthalate, polylactic acid, and polyurethane; the molecular weight and viscosity of the thermoplastic resin used in the melt impregnation die 1 are preferably lower than the molecular weight and viscosity of the thermoplastic resin used in the rear coating die 3. The melt impregnation die system is used to manufacture continuous fiber reinforced thermoplastic resin composite materials, and the continuous fiber can be bioactive glass fiber. The traction speed range of the traction device can be 1m / min-100m / min, for example, 1m / min-20m / min.

[0068] The melt impregnation die head 1, cooling device (not shown) and traction device (not shown) in the melt impregnation mold system of the utility model can adopt existing technologies, such as the impregnation die heads in CN114434672A and CN107415286B, and the specific structure will not be repeated here.

[0069] For the above-mentioned melt impregnation mold system, the preparation process of preparing continuous fiber reinforced thermoplastic resin filaments with different diameters, glass fiber content and high viscosity value may specifically include the following steps:

[0070] (a) the fiber bundles untwisted by the untwisting device are alternately passed through the fiber pre-dispersing device 2, and the electric heating rod of the dispersion roller 22 is heated at the same time to perform pre-dispersing and pre-heating treatment on the fiber bundles, and the tension of the fiber bundles can be adjusted by adjusting the angle of the dispersion roller 22;

[0071] (b) passing the continuous fiber bundle treated in step (a) through a melt impregnation die 1 to complete impregnation coating;

[0072] (c) pulling the fiber bundle impregnated with the thermoplastic molten resin in step (b) out of the impregnation mold (i.e., the melt impregnation die head 1) through a pulling device, and cooling and shaping it through a cooling device in the middle to obtain a continuous fiber reinforced thermoplastic resin wire with a smaller diameter;

[0073] (d) The plurality of composite wires with smaller diameters in step (c) are passed through the yarn guide plate 31 and then into the rear coating mold 3. The thermoplastic resin is extruded into the rear coating mold 3 through an extruder to complete the rear coating of the composite wires, thereby obtaining a continuous fiber reinforced thermoplastic resin wire with a higher viscosity value.

[0074] The resin wire prepared by the utility model is completed by two steps of impregnation and coating. The impregnation and coating processes can select the same or different resin grades according to the needs. The impregnation process can select a resin with relatively low molecular weight and viscosity to improve the impregnation effect, and the post-coating process stage can select a resin with relatively high molecular weight and viscosity to achieve the purpose of improving the surface quality of the wire, adjusting the fiber content and molecular weight and its distribution of the product, and improving the mechanics of the product.

[0075] In the above step (a), the continuous fiber can be a bioactive glass fiber; the temperature of the dispersion roller 22 after heating is 80-240° C., preferably 100° C. The dispersion roller 22 can be adjusted in an angle range of 0°-360°, and the corresponding tension can be read by a compass scale.

[0076] In the above step (b), the thermoplastic resin is selected from polyethylene, polypropylene, nylon, polyetheretherketone, polyesters including polyethylene terephthalate, polylactic acid, and polyurethane.

[0077] In the above step (c), the pulling speed of the pulling device ranges from 1 m / min to 100 m / min, preferably from 1 m / min to 20 m / min.

[0078] In summary, the utility model realizes quantitative setting of the degree of fiber pre-dispersion through a fiber pre-dispersion device, improves the repeatability of the process, and reduces the temperature difference between the fiber and the molten resin through the fiber preheating function, thereby improving the impregnation effect of the fiber in the mold cavity; after being processed by the melt impregnation die, a plurality of wires with smaller diameters are integrated through a post-coating mold to realize customization of wires with different diameters (for example, a 0.85 mm wire prepared by a melt impregnation die is prepared to obtain a post-coating diameter of 2.0 mm wire), which not only improves the surface quality and roundness of the wire, regulates the glass fiber content and molecular weight of the wire and its distribution, but also can further improve the interface bonding effect between the fiber and the resin, improve the impregnation effect of the fiber bundle, and thereby improve the mechanical and physical and chemical properties of the prepared continuous fiber impregnated thermoplastic resin composite material.

[0079] Compared with the prior art, the utility model has the following advantages:

[0080] 1. In the utility model, the dispersion roller is adjusted in height by rotating the compass with scale to change the pre-dispersion tension of the fiber. The tension value can be intuitively read and recorded through the compass scale, which greatly improves the repeatability of the preparation process of continuous fiber reinforced thermoplastic composite materials;

[0081] 2. The preparation method provided by the utility model completes the preparation of continuous fiber reinforced thermoplastic composite materials by three steps of fiber pre-dispersion and preheating, melt impregnation and post-coating, wherein the post-coating process is completed by a separate post-coating mold, which improves the stability of the preparation process. The traditional preparation method has a single equipment, a simple impregnation process, and poor fiber bundle dispersion and impregnation effects;

[0082] 3. The post-coating mold provided by the utility model can be designed with different die diameters according to different needs to achieve secondary adjustment of the product diameter. During post-coating, the fiber content, molecular weight and distribution of the product can be adjusted according to needs, while improving the surface quality and roundness of the product, improving the fiber impregnation effect and thus improving the mechanical and physical and chemical properties of the composite material. The mechanical properties of the prepared composite material are improved by 10-30%, the molecular weight can be increased by 50-300%, and the glass fiber content can be adjusted in the range of 10-80%;

[0083] 4. The rear coating mold provided in the utility model is composed of multiple detachable modules, the size specifications can be adjusted according to actual needs, and the interchangeability is strong. During the production process, it can realize functions such as faster mold opening and closing and cleaning of broken yarns, and the process stability is high.

[0084] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A post-coating mold, characterized in that: It includes intermediate, fiber core rod and shaping sleeve, among which: The fiber-introducing core rod comprises a cylindrical main body and a conical outlet in sequence, and the intermediate body is arranged around the cylindrical main body; The internal channel of the calibrating sleeve includes a second tapered section and a second straight section in sequence, and the tapered outlet of the fiber core rod is located in the second tapered section, so that a coating mold cavity is formed between the two; The intermediate body is provided with a feed port, the cylindrical body of the fiber feed core rod is provided with an annular flow channel connected to the feed port of the intermediate body, and the outer surface of the conical outlet is provided with a spiral flow channel connected to the annular flow channel. The number of the spiral flow channels is at least two and they are distributed in a circular array.

2. The rear covering mold according to claim 1, characterized in that: The diameter of the spiral flow channel is 1mm-5mm; And / or, the diameter of the annular flow channel is consistent with the diameter of the extruder die, which is 1mm-3mm.

3. The rear covering mold according to claim 1, characterized in that: The internal passage of the fiber inlet core rod comprises a third conical section / cylindrical section and a third straight section in sequence, wherein: The maximum opening diameter of the third conical section / the diameter of the cylindrical section is 5 mm-15 mm; And / or, the third tapered section and the third straight section transition smoothly; And / or, the length of the third straight section is 10 mm-40 mm; And / or, the third straight section is designed as a circular hole with a hole diameter ranging from 1 mm to 50 mm; And / or, the fiber-inlet core rod is fixed to the front surface of the intermediate body by an inlet flange.

4. The rear covering mold according to claim 1, characterized in that: The diameter of the maximum opening of the second tapered section is 10 mm to 50 mm; And / or, the length of the second tapered section is 5 mm-50 mm; And / or, the length of the second straight section is 10 mm-30 mm; And / or, the diameter of the second straight section is 5 mm-20 mm; And / or, the shaping sleeve is fixed to the rear surface of the intermediate body by an outlet flange.

5. The rear covering mold according to claim 1, characterized in that: A shaping sleeve is provided in the second straight section, and a shaping hole is provided in the shaping sleeve, wherein: The shaping sleeve is fixed in the second straight section by threaded connection, and the thread length on the surface of the shaping sleeve is 5mm-50mm; And / or, the diameter of the shaping hole is 1 mm-20 mm; And / or, the length of the shaping sleeve is 10 mm-50 mm; And / or, the aspect ratio of the shaping hole is 5-30.

6. The rear covering mold according to any one of claims 1 to 5, characterized in that: The rear cladding mold further comprises a yarn guide plate located in front of the fiber inlet of the fiber inlet core rod, and the yarn guide plate is provided with a yarn guide hole, wherein: The yarn guide holes are distributed in a circular or rectangular array; And / or, both ends of the yarn guide hole are chamfered; And / or, the number of the yarn guide holes is greater than or equal to the number of the fiber bundle strips to be coated.

7. A melt impregnation mold system, characterized in that: The invention comprises a fiber pre-dispersing device, a melt impregnation die head, a cooling device, a rear coating mold and a traction device which are connected in sequence, and the rear coating mold is the rear coating mold described in any one of claims 1-6.

8. The melt impregnation mold system according to claim 7, characterized in that: The fiber pre-dispersing device includes at least three fixed shafts arranged at equal intervals in the transverse direction, each fixed shaft is provided with a dispersion roller, the axis of the dispersion roller is spaced a preset distance from the corresponding fixed shaft, the dispersion roller is connected to the corresponding fixed shaft with the corresponding fixed shaft as the center and with an adjustable angle, and the fixed shaft is provided with a dispersion roller angle adjustment device.

9. The melt impregnation mold system according to claim 8, characterized in that: The diameter of the dispersion roller is 30 mm to 120 mm; And / or, the dispersion roller angle adjustment device is provided with a compass for recording the dispersion roller angle; And / or, a heating rod and a thermocouple are provided inside the dispersion roller, and the temperature of the dispersion roller after heating is 80° C.-240° C.; And / or, the dispersion roller is provided with a pressure sensor for detecting the tension of the fiber bundle.

10. The melt impregnation mold system according to claim 7, characterized in that: The thermoplastic resin used in the melt impregnation die and the rear coating die is selected from polyethylene, polypropylene, nylon, polyetheretherketone, polyester, and polyurethane; and / or, the molecular weight and viscosity of the thermoplastic resin used in the melt impregnation die are lower than the molecular weight and viscosity of the thermoplastic resin used in the post-coating mold; And / or, the melt impregnation mold system is used to manufacture a continuous fiber reinforced thermoplastic resin composite material, wherein the continuous fiber is a bioactive glass fiber; And / or, the traction speed of the traction device ranges from 1 m / min to 100 m / min.

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