Mould for producing PFA (Polyfluoroalkoxy) electrostatic tube
By setting a co-extrusion busbar structure inside the die head, the problem of insufficient synergy between the main adhesive and conductive adhesive in traditional dies is solved, realizing uniform mixing and stable molding of PFA electrostatic tubing, and improving product quality and surface finish.
Patent Information
- Application Number
- CN202423176075.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In the traditional PFA electrostatic tube production mold, the main adhesive and conductive adhesive cannot work together effectively during the processing, resulting in uneven physical properties of the conductive adhesive and affecting the quality of the tube.
The co-extrusion confluence structure inside the die head body is adopted, including a flow divider cone, a flow channel sealing sleeve, a wall thickness adjustment pressure ring, and a conical flow divider sleeve, to achieve co-extrusion confluence of PFA main colloid and conductive colloid, ensuring that the two are fully mixed and plasticized in the conical compression section, and formed into a uniform distribution after being formed by the die.
It improves the uniformity of conductive adhesive in the PFA matrix, ensures the smoothness and flatness of the pipe surface, avoids the precipitation of conductive filler, reduces the difficulty of temperature control, and improves processing quality.
Smart Images
Figure CN223545749U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of PFA electrostatic tube production technology, and in particular to a mold for PFA electrostatic tube production. Background Technology
[0002] In the semiconductor photovoltaic and display panel industries, flammable and explosive chemicals are transported. PFA material itself is prone to generating static electricity, which can easily ignite and explode these chemicals, causing accidents. The transparent part of the tube is made of high-purity PFA, while the black part contains conductive materials to create conductive PFA. This conductive PFA is extruded through a production mold. During the production process, the mold precisely shapes and processes the material to ensure the dimensional accuracy and quality of the tube.
[0003] In traditional PFA electrostatic tube production, the die head and die of the mold typically use separate conveying and merging when processing raw materials. During separate merging, the main adhesive and conductive adhesive cannot interact and lack synergy. The conductive adhesive may only be subjected to the limited pressure of its own extruder, which is insufficient to fully plasticize it. This results in uneven physical properties of the conductive adhesive, affecting the quality of the subsequent tubes. Utility Model Content
[0004] (a) Technical problems to be solved
[0005] To address the shortcomings of existing technologies, this utility model provides a mold for the production of PFA electrostatic tubes, which solves the technical problem of insufficient processing quality of existing molds.
[0006] (II) Technical Solution
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A mold for producing PFA electrostatic tubes includes a mold assembly, which includes a mold head body and a die, wherein the mold head body and the die are fixedly installed, and a core mold is provided between the mold head body and the die.
[0009] The die head body is symmetrically equipped with a co-extrusion confluence structure inside;
[0010] The co-extrusion confluence structure includes a flow divider cone, a flow channel sealing sleeve symmetrically arranged inside the die head body, a wall thickness adjustment pressure ring symmetrically arranged on the side wall of the die head body, a conical flow divider sleeve symmetrically arranged on the side wall of the die head body, the die orifice located on the side wall of the die head body, and the core die located at the center between the die head body and the die orifice.
[0011] Preferably, each of the flow channel sealing sleeves is located outside the flow divider cone, and each of the flow divider cones and flow channel sealing sleeves is set with the center point of the die head body, and the lower end of the die is provided with a conductive adhesive extrusion auxiliary machine connector.
[0012] Preferably, the conductive adhesive extrusion auxiliary connecting part is located inside the die, the conical diverter sleeve is located inside the wall thickness adjusting pressure ring, and both wall thickness adjusting pressure rings are partially exposed outside the die head body.
[0013] (III) Beneficial Effects
[0014] 1. Co-extruding and merging the PFA main colloid with the PFA conductive colloid in the compression section of the die head can achieve full plasticization of the conductive colloid and further fully mix the conductive filler (such as carbon black) with the PFA matrix. During co-extrusion and merging in the conical compression section of the splitter cone, the main colloid and the conductive colloid are simultaneously subjected to compressive force. Under this pressure environment, the conductive colloid can be better plasticized. Moreover, the co-flow of the two materials promotes the full mixing of the conductive filler (such as carbon black) in the PFA matrix. This force helps to break the agglomeration of the conductive filler and make it uniformly dispersed in the PFA matrix, thus improving the mixing quality.
[0015] Second, because the PFA conductive adhesive flowing through the conical compression section is pushed under certain pressure, the tube-shaped product after being cooled by the extrusion die has a better surface finish and smoothness. This can further prevent the problem of conductive filler precipitation. The material after co-extrusion and confluence in the conical compression section is cooled after being extruded through the die to form a tube. At the same time, because the good mixing has been achieved in the compression section, the conductive adhesive and the main adhesive are evenly distributed, and can be more evenly formed when extruded through the die. The limiting and guiding effect of the die makes the tube surface have a better finish and smoothness. At the same time, because the conductive filler is evenly dispersed in the matrix and the tube forming process is relatively stable, the precipitation of conductive filler can be avoided.
[0016] Third, by co-extruding and merging the PFA main colloid and PFA conductive adhesive in the conical compression section, the synergistic flow of the main colloid and conductive adhesive in the conical compression section during the co-extrusion and merging process makes their temperature distribution more uniform. Because the two materials are mixed and flowing in this area at the same time, the heating coil can more effectively act on the two materials in this area, thereby reducing the difficulty of temperature control. Attached Figure Description
[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.
[0018] Figure 1 This is a planar sectional view of the present invention.
[0019] Figure 2 This is a top view of the conical flow divider sleeve of this utility model;
[0020] Figure 3 This is a left view of the conical diverter sleeve of this utility model;
[0021] Figure 4 This is a top cross-sectional view of the conical diverter sleeve of this utility model.
[0022] Legend: 11. Die head body; 12. Die; 13. Core die; 14. Divider cone; 15. Flow channel sealing sleeve; 16. Conductive adhesive extrusion auxiliary connecting parts; 17. Wall thickness adjustment pressure ring; 18. Conical divider sleeve. Detailed Implementation
[0023] This application provides a mold for producing PFA electrostatic tubes, effectively solving the technical problem of insufficient processing quality in existing molds. In the compression section of the mold head, the PFA main adhesive and PFA conductive adhesive are co-extruded and merged, achieving sufficient plasticization of the conductive adhesive. Furthermore, it further ensures thorough mixing of the conductive filler (such as carbon black) with the PFA matrix. During co-extrusion and merging in the conical compression section of the flow divider cone, the main adhesive and conductive adhesive are simultaneously subjected to compressive force. Under this pressure environment, the conductive adhesive can be better plasticized. Moreover, the co-flow of the two materials promotes thorough mixing of the conductive filler (such as carbon black) within the PFA matrix. This force helps break up the agglomeration of the conductive filler, allowing it to be uniformly dispersed within the PFA matrix, thus improving... The mixing quality, along with the pressure exerted by the PFA conductive adhesive flowing through the conical compression section, results in a better surface finish and smoothness in the tube after cooling through the extrusion die. This further prevents the precipitation of conductive filler. The material, after co-extrusion and confluence in the conical compression section, is cooled after extrusion through the die to form a tube. Simultaneously, due to the good mixing achieved in the compression section, the conductive adhesive and main adhesive are evenly distributed, allowing for more uniform forming during extrusion through the die. The limiting and guiding effect of the die enables the tube surface to achieve a better finish and smoothness. Furthermore, because the conductive filler is evenly dispersed in the matrix and the tube forming process is relatively stable, the precipitation of conductive filler can be avoided.
[0024] Example
[0025] like Figure 1 - Figure 4 As shown, the technical solution in this application embodiment effectively solves the technical problem of insufficient mold processing quality in existing molds. The overall idea is as follows:
[0026] To address the problems existing in the prior art, this utility model provides a mold for the production of PFA electrostatic tubes, including a mold assembly, which includes a mold head body 11 and a die 12. The mold head body 11 and the die 12 are fixedly installed, and a core mold 13 is provided between the mold head body 11 and the die 12.
[0027] The die head body 11 is symmetrically equipped with a co-extrusion confluence structure, which includes a flow divider cone 14. During the material flow process, the flow divider cone 14 is used to further subdivide the flow path of PFA main colloid and PFA conductive adhesive before entering the compression section. It can make the material more evenly distributed in different flow channels, ensuring that the main colloid and conductive adhesive can be co-extruded and converged at appropriate flow rates and pressures when entering the conical compression section. The die head body 11 is symmetrically equipped with a flow channel sealing sleeve 15. The flow channel sealing sleeve 15 is mainly used to close part of the flow channel, ensuring that PFA main colloid and PFA conductive adhesive flow within the specified flow channel, avoiding material leakage or flow to unexpected areas. This ensures that the material flows on the correct path during the co-extrusion confluence process, allowing the main colloid and conductive adhesive to accurately converge in the conical compression section, achieving a stable co-extrusion process, which is beneficial to improving product quality.
[0028] The die head body 11 is symmetrically equipped with wall thickness adjustment pressure rings 17 on its side wall. These pressure rings are primarily used to adjust the wall thickness of the tube-shaped product. During co-extrusion and merging, adjusting the pressure of the pressure rings on the main colloid can indirectly affect the distribution of the conductive adhesive. Since the PFA main colloid and PFA conductive adhesive co-extrude and merge in the conical compression section, wall thickness adjustment can be achieved without complex adjustments to the auxiliary equipment of the conductive extruder. The die head body 11 is also symmetrically equipped with conical diverter sleeves 18 on its side wall. During material flow, the conical diverter sleeves 18 may initially guide and divert the PFA main colloid and PFA conductive adhesive. Their conical structure helps the material flow evenly around them, creating conditions for subsequent co-extrusion and merging in the compression section. When passing through the conical diverter sleeve 18, the main colloid and conductive adhesive can advance along certain paths and converge at appropriate positions. The die 12 is located on the side wall of the die head body 11, and the core die 13 is located at the center between the die head body 11 and the die 12. The core die 13 cooperates with the die 12 to determine the inner diameter of the pipe. During the co-extrusion confluence process, the material flow state around the core die 13 is also affected by the co-extrusion of the PFA main colloid and the PFA conductive adhesive. The main colloid and conductive adhesive are extruded around the core die 13. The structure of the core die 13 can help guide the material to be evenly distributed, ensuring the uniformity of the pipe wall thickness. At the same time, the presence of the core die 13 also helps to form a smooth inner surface inside the pipe, working together with the die 12 to ensure the forming quality of the pipe.
[0029] Each flow channel sealing sleeve 15 is located outside the flow divider cone 14. Each flow divider cone 14 and flow channel sealing sleeve 15 are set at the center point of the die head body 11. The lower end of the die 12 is provided with a conductive adhesive extrusion auxiliary machine connector 16. The conductive adhesive extrusion auxiliary machine connector 16 is used to connect the conductive adhesive extrusion auxiliary machine and stably deliver the conductive adhesive to the die head to co-extrude and merge with the main adhesive. Part of it is located inside the die 12. Its existence ensures the supply of conductive adhesive. In the co-extrusion process, through reasonable design, it can achieve synergy with the extrusion of the main adhesive. For example, according to the extrusion speed and pressure of the main adhesive, the supply speed of the conductive adhesive can be adjusted to achieve a good co-extrusion and merging effect in the conical compression section. The conical flow divider sleeve 18 is located inside the wall thickness adjustment pressure ring 17. Both wall thickness adjustment pressure rings 17 are partially exposed outside the die head body 11.
[0030] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.
Claims
1. A mold for producing PFA electrostatic tubes, comprising a mold assembly, the mold assembly including a mold head body (11) and a die (12), the mold head body (11) and the die (12) being fixedly installed, and a core mold (13) being provided between the mold head body (11) and the die (12), characterized in that... ； The die head body (11) is symmetrically provided with a co-extrusion confluence structure inside; The co-extrusion confluence structure includes a flow divider cone (14), a flow channel sealing sleeve (15) is symmetrically provided inside the die head body (11), a wall thickness adjustment pressure ring (17) is symmetrically provided on the side wall of the die head body (11), and a conical flow divider sleeve (18) is symmetrically provided on the side wall of the die head body (11).
2. The mold for producing PFA electrostatic tubes as described in claim 1, characterized in that, The die (12) is located on the side wall of the die head body (11); The core mold (13) is located at the center between the mold head body (11) and the die (12).
3. The mold for producing PFA electrostatic tubes as described in claim 2, characterized in that, Each of the flow channel sealing sleeves (15) is located on the outside of the flow divider cone (14).
4. The mold for producing PFA electrostatic tubes as described in claim 3, characterized in that, The lower end of the die (12) is provided with a conductive adhesive extrusion auxiliary connector (16).
5. A mold for producing PFA electrostatic tubes as described in claim 4, characterized in that, The conductive adhesive extrusion auxiliary connector (16) is located inside the die (12).
6. The mold for producing PFA electrostatic tubes as described in claim 5, characterized in that, The tapered diverter sleeve (18) is located inside the wall thickness adjustment pressure ring (17).
7. A mold for producing PFA electrostatic tubes as described in claim 6, characterized in that, Each of the aforementioned flow divider cones (14) and flow channel seals (15) is positioned at the center point of the mold head body (11).
8. A mold for producing PFA electrostatic tubes as described in claim 7, characterized in that, Both of the aforementioned wall thickness adjustment pressure rings (17) are partially exposed outside the mold head body (11).