A taper flow forming single screw profile extrusion fiber direction improvement device
By using a conical flow forming single-screw device, the flow of molten plastic is guided by the conical surface of the guide component, which solves the fiber orientation problem in traditional single-screw extrusion molding and improves the longitudinal tensile strength of the profile.
Patent Information
- Application Number
- CN202522038249.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-23
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-23
AI Technical Summary
Traditional single-screw extrusion molding cannot guarantee that the fiber direction in the fiber-modified fluid is oriented towards the extrusion direction, resulting in the inability to enhance the longitudinal tensile strength of the profile, while the transverse tensile strength is much higher than that in the longitudinal direction.
A single-screw device for conical flow forming is adopted. The plastic melt is introduced from the thin tube section into the annular channel of the guide section through the guide component, and the conical surface of the guide component guides the plastic melt to flow along the conical surface to achieve dynamic balance forming.
The improved fiber angle enhances the longitudinal tensile strength, solving the problem that the fiber direction cannot be aligned with the extrusion direction in traditional single-screw extrusion molding, thus strengthening the longitudinal tensile strength of the profile.
Smart Images
Figure CN224675488U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of plastic processing technology, specifically to a device for improving the fiber orientation of a single-screw extrusion profile in a conical flow forming process. Background Technology
[0002] Traditional single-screw extrusion molding cannot guarantee that the fiber orientation within the fiber-modified fluid is towards the extrusion direction, resulting in the transverse tensile strength of the extruded profile being far greater than its longitudinal tensile strength. The purpose of adding fiber modification is to enhance the longitudinal tensile strength of the profile; the orientation of the long, thin fibers is the direction of increased tensile strength, and the fiber orientation is roughly the same as the flow direction. In traditional single-screw extrusion molding, the plastic melt is extruded from a small central channel to fill a sizing sleeve with a larger diameter for profile shaping. This results in a roughly perpendicular movement of the extrusion direction, with the melt flowing from the center outwards, guiding the transverse distribution of the fibers. The melt then cools and solidifies, thus enhancing the transverse strength of the profile, while providing almost no longitudinal reinforcement. The measured transverse tensile strength is far higher than the longitudinal tensile strength. Utility Model Content
[0003] To address the technical problem in existing single-screw extrusion molding where the fiber orientation in the fiber-modified fluid cannot be guaranteed to be towards the extrusion direction, thus preventing the enhancement of the longitudinal tensile strength of the profile, this application proposes a tapered flow molding single-screw profile extrusion fiber orientation improvement device, which solves the aforementioned technical problem.
[0004] The technical solution adopted by this utility model to solve its technical problem is:
[0005] This utility model provides a device for improving the fiber orientation of a single-screw profile extrusion in a conical flow forming process, used for guiding the forming of plastic melt. It includes: a melt channel, comprising a thin tube section for introducing the plastic melt and a guide section located downstream of the thin tube section; and a guide member, which is a continuous body with a cylindrical middle section and conical ends. The guide member is fixed within the melt channel and coaxially arranged with the melt channel. The cylindrical section of the guide member is disposed in the guide section to make the flow channel at the guide section an annular channel. After the plastic melt is introduced from the thin tube section of the melt channel, it is guided by the conical end of the guide member and flows into the annular channel of the guide section. After passing through the annular channel of the guide section, the plastic melt is guided by the conical end of the guide member to flow along the conical surface to complete the dynamic balance of extrusion.
[0006] Furthermore, the inner wall shape of the variable diameter section between the thin tube segment and the guide tube matches the conical shape of the end of the guide tube directly opposite it.
[0007] Furthermore, a heating coil is disposed within the guide member.
[0008] Furthermore, a removable closure block is formed on the cylindrical section of the guide member.
[0009] Furthermore, a connecting pin is detachably connected to the sealing block, and the connecting pin is detachably connected to the wall of the guide section.
[0010] Furthermore, the connecting pin penetrates the wall of the guide section radially along the melt flow channel, and the insertion end of the connecting pin is screwed to the sealing block.
[0011] Furthermore, the pin body of the connecting pin has a hollow structure to connect the power line and the thermocouple.
[0012] Furthermore, the cone angles at both ends of the guide member are in the range of 60-90°.
[0013] Furthermore, one end of the guide section wall is connected to a sizing sleeve, and the channel inside the sizing sleeve forms a cooling and molding channel for the plastic melt.
[0014] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:
[0015] This invention relates to a conical flow forming single-screw profile extrusion fiber orientation improvement device, used for guiding and forming plastic melt. The plastic melt is introduced from the thin tube section of the melt flow channel, guided by the cone at one end of the guide member, and flows into the annular channel of the guide section. After passing through the annular channel of the guide section, the plastic melt is guided by the cone at the other end of the guide member to flow along the conical surface to complete the dynamic balance of extrusion and cool and form. The presence of the conical surface causes the plastic melt to be oriented towards the extrusion direction (i.e., the longitudinal direction), improving the fiber angle and thus improving the longitudinal tensile strength. This solves the technical problem in the prior art where the longitudinal tensile strength of the profile cannot be enhanced because the fiber orientation in the fiber-modified fluid cannot be guaranteed to be towards the extrusion direction in single-screw extrusion molding. Attached Figure Description
[0016] Figure 1 This is a longitudinal cross-sectional view of the tapered flow forming single-screw profile extrusion fiber orientation improvement device of this utility model;
[0017] Figure 2 This is a cross-sectional view of the transverse direction of the conical flow forming single-screw profile extrusion fiber orientation improvement device of this utility model.
[0018] Wherein: 1-melt flow channel, 11-circular channel; 2-guide component, 21-heating coil, 22-sealing block, 23-connecting pin; 3-sizing sleeve, 31-cooling and forming channel; 4-heat insulation pad; 5-cover. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0020] like Figure 1-2 As shown, this utility model provides a device for improving the fiber direction of a single-screw profile extrusion in a conical flow forming process, used for guiding the forming of plastic melt. It includes a melt channel 1 and a guide member 2. The melt channel includes a thin tube section for introducing the plastic melt and a guide section located downstream of the thin tube section. The guide member 2 is a continuous body with a cylindrical middle section and conical ends, with the conical ends gradually narrowing towards the ends. The guide member 2 is fixed inside the melt channel and is coaxially arranged with the melt channel, that is, the guide member 2 is arranged in the center of the guide section. The cylindrical section of the guide member 2 is arranged in the guide section so that the flow channel at the guide section becomes an annular channel 11. After the plastic melt is introduced from the thin tube section of the melt channel, it is guided by the conical end of the guide member 2 and flows into the annular channel 11 of the guide section. After passing through the annular channel 11 of the guide section, the plastic melt is guided by the conical end of the guide member 2 and flows along the conical surface to complete the dynamic balance of extrusion.
[0021] Furthermore, the cone angles at both ends of the guide member 2 range from 60 to 90°.
[0022] In a preferred embodiment of the present invention, the inner wall shape of the variable diameter section between the thin tube segment and the guide is matched with the conical shape of the end of the guide member 2 directly opposite it, that is, the inner wall surface of the variable diameter section is also formed as a gradually expanding conical surface.
[0023] In a preferred embodiment of the present invention, a heating coil 21 is disposed inside the guide member 2. Preferably, a ceramic block is disposed around the heating coil 21 to prevent leakage and to provide a good heat transfer effect.
[0024] In a preferred embodiment of the present invention, a detachable sealing block 22 is formed on the cylindrical section of the guide member 2. On the one hand, the sealing block 22 can seal the heating coil 21 inside the cylindrical section; on the other hand, the sealing block 22 is also responsible for fixing the guide member 2 inside the flow guide section. Specifically, a connecting pin 23 is detachably connected to the sealing block 22, and the connecting pin 23 is detachably connected to the wall of the flow guide section. Further, the connecting pin 23 penetrates the wall of the flow guide section along the radial direction of the melt flow channel 1, and the insertion end of the connecting pin 23 is screwed to the sealing block 22.
[0025] In a preferred embodiment of this utility model, the pin body of the connecting pin 23 is a hollow structure to connect the power line and the thermocouple, that is, the hollow structure of the connecting pin 23 is used as a temperature measuring hole.
[0026] In a preferred embodiment of this utility model, the wall of the guide section is formed by splicing two semi-circular covers 5. Specifically, connecting ears can be provided on the two covers 5, and the connecting ears are then screwed together.
[0027] In a preferred embodiment of the present invention, one end of the guide section wall is connected to a sizing sleeve 3, and the channel inside the sizing sleeve 3 is formed as a cooling and forming channel 31 for the plastic melt. The cone at one end of the guide member 2 is located at the transition between the melt flow channel 1 and the cooling and forming channel 31.
[0028] Furthermore, a heat insulation pad 4 is provided at the connection between the guide section wall and the sizing sleeve 3.
[0029] It should be noted that during the extrusion process, it is necessary to ensure that the plastic melt in the melt flow channel 1 is not cooled and solidified. Therefore, the wall of the guide section and the guide fluid need to be heated. The cooling and forming channel 31 of the sizing sleeve 3 is used for the cooling and forming of the plastic melt and does not need to be heated. Therefore, a heat insulation pad 4 is provided at the connection between the wall of the guide section and the sizing sleeve 3.
[0030] It should be understood that the specific embodiments described above are only for explaining the present invention and are not intended to limit the present invention. Obvious variations or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.
Claims
1. A device for improving fiber orientation in conical flow forming single-screw profile extrusion, used for guiding and forming plastic melt, characterized in that, include: The melt flow channel (1) includes a thin tube section for introducing plastic melt and a guide section located downstream of the thin tube section; The guide (2) is a continuous body with a cylindrical middle section and conical ends. The guide (2) is fixed in the melt flow channel and is coaxially arranged with the melt flow channel. The cylindrical section of the guide (2) is arranged in the guide section so that the flow channel at the guide section becomes an annular channel (11). After the plastic melt is introduced from the thin tube section of the melt flow channel, it is guided by the cone at one end of the guide (2) and flows into the annular channel (11) of the guide section. After the plastic melt passes through the annular channel (11) of the guide section, it is guided by the cone at the other end of the guide (2) to flow along the conical surface to complete the dynamic balance of extrusion.
2. The device for improving fiber orientation in conical flow forming single-screw profile extrusion according to claim 1, characterized in that, The inner wall shape of the variable diameter section between the thin tube segment and the guide is matched with the conical shape of the end of the guide member (2) directly opposite it.
3. The device for improving fiber orientation in conical flow forming single-screw profile extrusion according to claim 1, characterized in that, A heating coil (21) is disposed inside the guide member (2).
4. The device for improving fiber orientation in conical flow forming single-screw profile extrusion according to claim 3, characterized in that, A removable closure block (22) is formed on the cylindrical section of the guide member (2).
5. The device for improving fiber orientation in conical flow forming single-screw profile extrusion according to claim 4, characterized in that, The sealing block (22) is detachably connected to a connecting pin (23), and the connecting pin (23) is detachably connected to the wall of the guide section.
6. The device for improving fiber orientation in conical flow forming single-screw profile extrusion according to claim 5, characterized in that, The connecting pin (23) penetrates the wall of the guide section radially along the melt flow channel (1), and the insertion end of the connecting pin (23) is screwed to the sealing block (22).
7. The device for improving fiber orientation in conical flow forming single-screw profile extrusion according to claim 5, characterized in that, The connecting pin (23) has a hollow structure to connect the power line and thermocouple.
8. The device for improving fiber orientation in conical flow forming single-screw profile extrusion according to claim 1, characterized in that, The cone angles at both ends of the guide member (2) range from 60 to 90°.
9. The device for improving fiber orientation in conical flow forming single-screw profile extrusion according to claim 1, characterized in that, One end of the guide section wall is connected to a sizing sleeve (3), and the channel inside the sizing sleeve (3) forms a cooling and forming channel (31) for the plastic melt.