Impregnation mold for producing continuous fiber prepreg filaments
By using an impregnation mold with a longitudinal S-shaped impregnation channel and a baffle structure in the production of continuous fiber prepreg, the problem of difficult impregnation of thermoplastic resin materials was solved, the impregnation effect and material strength were improved, and the production process was optimized.
Patent Information
- Application Number
- CN202423215816.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-25
AI Technical Summary
In independent extrusion continuous fiber composite FDM 3D printers, existing technologies struggle to effectively impregnate thermoplastic resin materials into the inner layer of continuous fibers within a limited time, resulting in poor impregnation, printing failures, and material aging, which ultimately affect the strength of the final product.
An impregnation mold with a longitudinal S-shaped impregnation channel is used to allow thermoplastic resin material to penetrate into the continuous fiber through extrusion. Baffles and V-shaped positioning pins are set in the mold design to prevent material loss and fiber scratching, thus optimizing the production process.
It improves the wetting effect of continuous fiber prepreg, reduces porosity and material waste, enhances the mechanical properties of composite materials, prevents material aging, and improves production efficiency.
Smart Images
Figure CN223849705U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of equipment for producing continuous fiber prepreg, and in particular to an impregnation mold for producing continuous fiber prepreg. Background Technology
[0002] In FDM 3D printers for independent extrusion of continuous fiber composite materials, the printer is controlled by two independent nozzles. One nozzle is responsible for printing thermoplastic resin material, and the other nozzle is responsible for printing prepreg made of continuous fibers such as carbon fiber, glass fiber, and aramid fiber. Currently, the preparation of continuous fiber prepreg typically uses a transverse roller impregnation method, which makes it difficult to generate sufficient pressure at the exit die. This prevents the thermoplastic resin material from effectively wetting the inner structure of the continuous fiber within a limited time, resulting in poor wetting of the continuous fiber prepreg. During 3D printing, this leads to breakage, clogging, and other problems, causing printing failures. Furthermore, when such continuous fiber prepreg is used as a 3D printing material, the strength of the final product may not meet the design requirements. In addition, existing prepreg preparation methods are prone to thermoplastic resin aging during the preparation process. Therefore, it is necessary to optimize the existing production process to further improve the quality of continuous fiber prepreg preparation. Utility Model Content
[0003] The main technical problem solved by this utility model is to provide an impregnation mold for the production of continuous fiber prepreg, which can improve the production quality of continuous fiber prepreg.
[0004] To solve the above-mentioned technical problems, the present invention provides a technical solution as follows: An impregnation die for continuous fiber prepreg production is provided. The impregnation die includes a cover plate, a die body, a heating plate, an inlet pressure plate, and an outlet pressure plate. The cover plate and the heating plate are the same size as the die body. The cover plate is fastened to the surface of the die body by fastening bolts. The heating plate is fixed to the back of the die body by fastening bolts. The surface of the die body is provided with a longitudinal S-shaped impregnation channel. There are at least two continuous bends between the inlet and outlet of the longitudinal S-shaped impregnation channel. A feed hole is provided on one side of the die body. A screw feeder compatible with a single-screw extruder is installed outside the feed hole. The flange connected to the die head has a feed hole that penetrates into the mold body and connects to the lower half of the longitudinal S-shaped impregnation channel. The inlet and outlet of the longitudinal S-shaped impregnation channel are respectively equipped with an inlet pressure plate and an outlet pressure plate. The inlet pressure plate is provided with a sizing inlet hole, and the outlet pressure plate is provided with a sizing outlet hole. The bottom of the mold body is provided with a temperature sensor and a lower overflow hole connected to the outlet position of the longitudinal S-shaped impregnation channel. The upper part of the mold body is provided with an upper overflow hole connected to the inlet position of the longitudinal S-shaped impregnation channel. A set screw structure is also provided between the cover plate and the mold body. The set screw structure includes an outer set screw hole on the cover plate and a corresponding inner set screw hole on the mold body.
[0005] In a preferred embodiment of this utility model, the inlet and outlet directions of the longitudinal S-shaped impregnation channel are perpendicular.
[0006] In a preferred embodiment of this utility model, a semi-enclosed slot positioning structure is provided between the mold body and the cover plate, and the bolt connection structure between the cover plate and the mold body is evenly distributed on the outside of the semi-enclosed slot positioning structure. The semi-enclosed slot positioning structure includes a semi-enclosed positioning groove provided on the surface of the mold body around the longitudinal S-shaped impregnation channel and a positioning protrusion provided on the cover plate that matches the positioning groove.
[0007] In a preferred embodiment of this invention, a baffle structure is provided at the outlet position of the longitudinal S-shaped impregnation channel. The baffle structure has a through fiber passage hole in the middle. The wire exit pressure plate is fixed to the outside of the baffle, and the center line of the sizing wire exit hole on the wire exit pressure plate is collinear with the center line of the fiber passage hole. A V-shaped positioning pin is installed in front of the baffle structure. The V-shaped positioning pin consists of a pin rod and a pin head, and a V-shaped material binding opening is provided between the pin rod and the pin head, with the material binding opening aligned with the fiber passage hole.
[0008] In a preferred embodiment of this utility model, the infeed pressure plate is provided with a plurality of sizing infeed holes of different diameters and the same number of pressure plate mounting holes. The plurality of sizing infeed holes are arranged in a straight line in sequence according to their diameters, and the same number of pressure plate mounting holes are also arranged in a straight line in a straight line. The two straight lines are parallel to each other, and the plurality of sizing infeed holes and the pressure plate mounting holes correspond one-to-one. The longitudinal S-shaped impregnation channel inlet position on the mold body is provided with two threaded bottom holes with a hole spacing adapted to the hole spacing between the pressure plate mounting holes.
[0009] The beneficial effects of this invention are as follows: By optimizing the existing continuous fiber prepreg production method, this invention replaces the traditional impregnation roller with a mold featuring a longitudinal S-shaped impregnation channel. During production, the extrusion action at the longitudinal S-shaped channel helps the thermoplastic resin material better penetrate into the interior of the continuous fiber bundle, while simultaneously extruding any air bubbles that may be present within the continuous fiber bundle. This helps improve the quality of the interfacial bonding between the continuous fiber and the thermoplastic resin material, reducing the porosity in the composite material and thus improving its mechanical properties. Secondly, eliminating the traditional impregnation roller helps reduce the volume of the melt cavity in the impregnation mold, reducing material waste. Finally, the longitudinal arrangement of the S-shaped channel with an overflow hole at the bottom prevents the thermoplastic resin material from remaining in the channel for extended periods, preventing quality failures in the continuous prepreg production due to material aging. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the assembly structure of a preferred embodiment of the present invention;
[0011] Figure 2 This is an enlarged schematic diagram of a portion of the mold body in the illustrated embodiment;
[0012] Figure 3 This is a schematic diagram of the structure of the inlet pressure plate and the outlet pressure plate in the embodiment shown.
[0013] The components in the attached diagram are labeled as follows:
[0014] 1. Cover plate; 2. Mold body; 3. Heating plate; 4. Outlet pressure plate; 5. V-shaped locating pin; 6. Temperature sensor; 7. Inlet pressure plate; 8. Fastening bolts; 9. Flange.
[0015] 101. Positioning protrusion; 102. Bolt connection outer hole; 103. Outer set screw hole;
[0016] 201. Longitudinal S-shaped impregnation channel; 202. Feed hole; 203. Internal set screw hole; 204. Positioning groove; 205. Bolt connection inner hole; 206. Lower overflow hole; 207. Upper overflow hole; 208. Fiber passage hole; 209. Positioning threaded hole; 2010. Flange connection hole; 2011. Threaded bottom hole;
[0017] 401. Sizing wire outlet hole; 402. Mold mounting hole; 501. Pin head; 502. Pin rod; 503. Material bundle opening;
[0018] 701. Sizing inlet hole; 702. Pressure plate mounting hole. Detailed Implementation
[0019] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.
[0020] Please see Figure 1 and Figure 2 The embodiments of this utility model include:
[0021] An impregnation die for continuous fiber prepreg production includes a cover plate 1, a die body 2, a heating plate 3, an inlet pressure plate 7, and an outlet pressure plate 4. The cover plate 1 and the heating plate 3 are the same size as the die body 2. The cover plate 1 is pressed tightly against the surface of the die body 2 by fastening bolts 8. The heating plate 3 is fixed to the back of the die body 2 by fastening bolts 8. The surface of the die body 2 is provided with a longitudinal S-shaped impregnation channel 201. The longitudinal S-shaped impregnation channel 201 has two consecutive bends of the same radius between its inlet and outlet. A feed hole 202 is provided on one side of the die body 2. A flange connection hole 2010 is provided around the feed hole 202. A flange 9, which can be connected to the die head of a single screw extruder, is aligned with the feed hole 202 through the flange connection hole 2010. The inlet is fixed to the side of the mold body 2. The feed hole 202 passes through the mold body 2 and connects to the lower half of the longitudinal S-shaped impregnation channel 201. The inlet and outlet of the longitudinal S-shaped impregnation channel 201 are respectively equipped with an inlet pressure plate 7 and an outlet pressure plate 4. The inlet pressure plate 7 is provided with a sizing inlet hole, and the outlet pressure plate is provided with a sizing outlet hole 401. The bottom of the mold body 2 is provided with a temperature sensor 6 and a lower overflow hole 206 connected to the outlet position of the longitudinal S-shaped impregnation channel 201. The upper part of the mold body 2 is provided with an upper overflow hole 207 connected to the inlet position of the longitudinal S-shaped impregnation channel 201. A set screw structure is also provided between the cover plate 1 and the mold body 2. The set screw structure includes an outer set screw hole 103 on the cover plate 1 and a corresponding inner set screw hole 203 on the mold body 2.
[0022] The inlet and outlet directions of the longitudinal S-shaped impregnation channel 201 are perpendicular. This allows continuous fibers to enter the longitudinal S-shaped impregnation channel 201 through the sizing inlet hole 701 on the upper inlet pressure plate 7, and then be horizontally led out through the sizing outlet hole 401 on the outlet pressure plate 4. This adjusts the winding and unwinding paths during the continuous fiber impregnation process, creating a three-dimensional rotating structure for the entire production line, effectively improving the space utilization of the entire production line.
[0023] A semi-enclosed slot positioning structure is provided between the mold body 2 and the cover plate 1. This semi-enclosed slot positioning structure includes a semi-enclosed positioning groove 204 on the surface of the mold body 2 surrounding the longitudinal S-shaped impregnation channel 201, and positioning protrusions 101 on the cover plate 1 that match the positioning groove 204. The bolt connection structure between the cover plate 1 and the mold body 2 includes bolt connection outer holes 102 on the cover plate 1 and bolt connection inner holes 205 on the mold body 2. The bolt connection outer holes 102 are evenly distributed outside the positioning protrusions 101, and the bolt connection inner holes 205 are correspondingly distributed outside the positioning grooves 204. Thus, through the matching positioning of the positioning grooves 204 and the positioning protrusions 101, after tightening with the fastening bolts 8, the path of molten material flowing out along the gap between the cover plate 401 and the mold body 2 during production can be effectively blocked, reducing melt loss and improving overall production efficiency.
[0024] A baffle structure is provided at the outlet position of the longitudinal S-shaped impregnation channel 201. The baffle structure has a through fiber passage hole 208 in the middle. The wire exit pressure plate 4 engages with the positioning threaded holes 209 on both sides of the fiber passage hole 208 via mold mounting holes 402 on both sides of the sizing wire exit hole 701. It is fixed to the outside of the baffle structure with screws. After fixing, the center line of the sizing wire exit hole 401 on the wire exit pressure plate 4 is collinear with the center line of the fiber passage hole 208. A V-shaped positioning pin 5 is installed in front of the baffle structure. The V-shaped positioning pin 5 consists of a pin rod 502 and a pin head 501. A V-shaped material binding port 503 is provided between the pin rod 502 and the pin head 501, and the material binding port 503 is aligned with the fiber passage hole 208. By setting a baffle structure, the plastic melt can be prevented from flowing out of the outlet when the continuous fiber is drawn out. The use of the V-shaped positioning pin 5 can shape the continuous fiber after impregnation before entering the fiber passage hole 208, preventing the continuous fiber from being scratched or even broken by the edge of the hole due to the angle when it directly enters the fiber passage hole 208, which would cause internal blockage.
[0025] The feed plate 7 has four sizing feed holes 701 of different diameters and four plate mounting holes 702. The four sizing feed holes 701 are arranged in a straight line in order of diameter, and the four plate mounting holes 702 are also arranged in a straight line. The two lines are parallel to each other, and there is a one-to-one correspondence between the four sizing feed holes 701 and the four plate mounting holes 702. The longitudinal S-shaped impregnation channel 201 on the mold body 2 has two threaded bottom holes 2011 at the inlet position that are adapted to the hole spacing between the plate mounting holes 702. In this way, the feed plate 7 can adjust the plate mounting holes 702 that are aligned with the threaded bottom holes 2011 according to the feed specifications of the continuous fiber, so that the sizing feed holes 701 of the corresponding specifications can be aligned with the inlet position of the longitudinal S-shaped impregnation channel 201.
[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. An impregnation die for producing a continuous fiber prepreg yarn, characterized by, The impregnation mold comprises a cover plate, a mold body, a heating plate, an inlet pressing plate and an outlet pressing plate, the cover plate and the heating plate have the same size as the mold body, the cover plate is tightly pressed on the surface of the mold body through fastening bolts, the heating plate is fixed on the back surface of the mold body through fastening bolts, the surface of the mold body is provided with a longitudinal S-shaped impregnation flow channel, there are at least two continuous turns between the inlet and the outlet of the longitudinal S-shaped impregnation flow channel, one side of the mold body is provided with a feeding hole, a flange plate capable of being connected with the head of a single-screw extruder is installed outside the feeding hole, the feeding hole penetrates into the lower half of the longitudinal S-shaped impregnation flow channel in the mold body, the inlet and the outlet of the longitudinal S-shaped impregnation flow channel are respectively provided with the inlet pressing plate and the outlet pressing plate, the inlet pressing plate is provided with a diameter setting inlet hole, the outlet pressing plate is provided with a diameter setting outlet hole, the bottom of the mold body is provided with a temperature sensor and a lower overflow hole communicated with the position of the outlet of the longitudinal S-shaped impregnation flow channel, the upper part of the mold body is provided with an upper overflow hole communicated with the position of the inlet of the longitudinal S-shaped impregnation flow channel, a jackscrew structure is further arranged between the cover plate and the mold body, the jackscrew structure comprises an outer jackscrew hole on the cover plate and a corresponding inner jackscrew hole on the mold body.
2. The impregnation die for producing a continuous fiber prepreg filament according to claim 1, characterized by, The direction of the inlet of the longitudinal S-shaped impregnation flow channel is perpendicular to the direction of the outlet.
3. The impregnation die for producing a continuous fiber prepreg filament according to claim 1, characterized by, A half-enclosing clamping groove positioning structure is arranged between the mold body and the cover plate, and the bolt connection structure between the cover plate and the mold body is uniformly arranged outside the half-enclosing clamping groove positioning structure.
4. The impregnation die for producing a continuous fiber prepreg filament according to claim 3, characterized by, The half-enclosing clamping groove positioning structure comprises a half-enclosing positioning groove arranged around the longitudinal S-shaped impregnation flow channel on the surface of the mold body and a positioning convex strip matched with the positioning groove on the cover plate.
5. The impregnation die for producing a continuous fiber prepreg filament according to claim 1, wherein A baffle structure is arranged at the position of the outlet of the longitudinal S-shaped impregnation flow channel, a through fiber passing hole is arranged in the middle of the baffle structure, the outlet pressing plate is fixed outside the baffle, the diameter setting outlet hole on the outlet pressing plate is collinear with the center line of the fiber passing hole.
6. The impregnation die for producing a continuous fiber prepreg filament according to claim 5, wherein A V-shaped positioning pin is arranged in front of the baffle structure, the V-shaped positioning pin comprises a pin rod and a pin head, a V-shaped material clamping opening is arranged between the pin rod and the pin head, and the material clamping opening is aligned with the fiber passing hole.
7. The impregnation die for producing a continuous fiber prepreg filament according to claim 1, characterized by, A plurality of diameter setting inlet holes with different diameters and the same number of pressing plate mounting holes are arranged on the inlet pressing plate, the plurality of diameter setting inlet holes are uniformly arranged in a straight line in order of diameter, the same number of pressing plate mounting holes are also uniformly arranged in a straight line, the two straight lines are parallel to each other and the plurality of diameter setting inlet holes and the pressing plate mounting holes are one-to-one corresponding, and two thread bottom holes adapted to the hole distance between the pressing plate mounting holes are arranged at the position of the inlet of the longitudinal S-shaped impregnation flow channel on the mold body.