melted mixing nozzle

Abstract

The application discloses a melting mixing nozzle, which comprises a sub-nozzle, a flange connecting body and at least one melting valve core, the melting valve core is in a cylindrical structure, at least one group of mixing flow channels are formed in the circumferential body along the axial direction, and the mixing flow channels are connected by grooves with different depths. The melting valve core in the melting mixing nozzle is in a cylindrical structure, a plurality of grooves with different depths are formed in the circumferential body, plastic can be better melted and mixed, and the quality of injection molding is greatly improved; the structure is simple and novel, the defects of poor plasticizing, poor color mixing, unstable sol time, difficulty in cleaning after color changing, black spots and black lines and the like of the existing screw are effectively solved, the production efficiency is improved, and the production cost of enterprises is reduced.

Description

Technical Field

[0001] This invention belongs to the field of injection molding technology, and relates to a compounding nozzle, and more particularly to a melt-enhancing compounding nozzle. Background Technology

[0002] The injection molding industry is currently experiencing fierce competition due to the continuous updates and improvements in the types and performance of plastics. This has led to increasingly lower profit margins for processing companies, particularly in the injection molding sector. As is well known, the three most critical factors in the injection molding industry are raw materials, machinery, and molds. Raw materials are the most critical factor. Currently, the types of raw materials are constantly increasing, as are the modified plastics. The additives, color powders, and masterbatches used are becoming increasingly complex. Problems with the previously standard screw design are gradually becoming apparent, such as poor plasticization, poor color mixing, unstable melt time, difficulty in cleaning after color changes, and black spots and streaks. Replacing the screw and barrel is too costly, adding a significant financial burden to companies. Summary of the Invention

[0003] The purpose of this invention is to propose a novel melt-enhancing compounding nozzle, which is installed at the front end of the injection molding machine's feed tube to improve and compensate for insufficient screw compounding or poor compounding effect.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The present invention provides a melting and mixing nozzle, comprising a sub-nozzle, a flange connection body and at least one melting valve core, wherein the melting valve core is a cylindrical structure, and at least one set of mixing channels are formed along the axial direction of its periphery, and the mixing channels are formed by connecting several grooves of different depths.

[0006] Furthermore, on the melting and mixing nozzle, several mixing channels are arranged at intervals along the periphery of the melting valve core, and inlet and outlet are respectively provided at both ends.

[0007] Furthermore, on the melt-enhancing mixing nozzle, the mixing channel includes at least one first groove and at least one second groove connected to the first groove, and the depth of the first groove is greater than or less than the depth of the second groove.

[0008] More preferably, on the melt-enhancing compounding nozzle, the first groove and / or the first groove is straight, curved, or broken.

[0009] More preferably, on the melt-enhancing compounding nozzle, the first groove is disposed on at least one side of the second groove and communicates with the sidewall of the second groove.

[0010] More preferably, on the melt-enhancing mixing nozzle, the mixing channel further includes a third groove, which is disposed between the first groove and / or the second groove.

[0011] More preferably, on the melt-enhancing compounding nozzle, the third groove is disposed on at least one side of the first groove and / or the second groove, and communicates with the sidewall of the first groove and / or the second groove.

[0012] Furthermore, on the aforementioned melt-enhancing mixing nozzle, the number of mixing channels is 1-20, and the number of grooves is 2-100.

[0013] Furthermore, on the aforementioned melt-enhancing compounding nozzle, the two ends of the melt-enhancing valve core are tapered structures with a cone angle of 5-120°.

[0014] Furthermore, in the aforementioned melt-enhancing compounding nozzle, the length of the melt-enhancing valve core is 10-500mm, and the outer diameter is 10-100mm.

[0015] Furthermore, on the melt-enhancing compounding nozzle, the surface of the melt-enhancing valve core is coated with a protective coating, which is applied by methods such as vacuum plating of chromium nitride and titanium nitride, or electroplating.

[0016] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0017] (1) The melting valve core adopts a cylindrical structure. By opening multiple grooves of varying depths around its circumference, the plastic can be better mixed and melted, which greatly improves the injection molding quality.

[0018] (2) The melting enhancement valve core is assembled in the assembly cavity between the sub-nozzle and the flange connection body, which is convenient and quick to install and disassemble, and very easy to clean;

[0019] (3) Adding a protective coating to the outside of the melt-enhancing valve core improves the wear resistance, corrosion resistance and lubrication performance of the melt-enhancing valve core surface, and makes it less likely to have dead corners that cause black spots and black lines.

[0020] (4) The structure of the melt-enhancing compounding nozzle is simple and novel, effectively solving the defects of existing screws such as poor plasticization, poor color mixing, unstable sol time, difficulty in cleaning after color change, black spots and black lines, etc. Moreover, it has high production efficiency and reduces the production cost of enterprises. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a melt-enhancing compounding nozzle according to the present invention;

[0022] Figure 2 This is a schematic cross-sectional view of the melting valve core in a melting-enhancing compounding nozzle according to the present invention.

[0023] Figure 3 This is a longitudinal cross-sectional view of the melting valve core in a melting-enhancing compounding nozzle according to the present invention.

[0024] Figure 4 This is a schematic cross-sectional view of the rear end of the melting valve core in a melting-enhancing compounding nozzle according to the present invention.

[0025] Figure 5 This is a schematic diagram of the surface development structure of the melting valve core in a melting-enhancing compounding nozzle according to the present invention;

[0026] The accompanying figures are labeled as follows:

[0027] 10-Sub-nozzle; 20-Flange connection body; 30-Melt-enhancing valve core; 31-Mixing flow channel; 32-First groove; 33-Second groove; 34-Third groove. Detailed Implementation

[0028] The present invention will now be described in detail and specifically through specific embodiments to enable a better understanding of the invention. However, the following embodiments do not limit the scope of the invention.

[0029] In some embodiments, such as Figure 1 As shown, a melt-enhancing compounding nozzle is provided, which is installed at the front end of the injection molding machine's feed tube to improve and compensate for insufficient or poor mixing by the screw. The melt-enhancing compounding nozzle mainly includes a sub-nozzle 10, a flange connector 20, and at least one melt-enhancing valve core 30. The melt-enhancing valve core 30 is disposed in the assembly cavity formed by the flange connector 20 and the sub-nozzle 10. As needed, there can be multiple melt-enhancing valve cores 30, which are sequentially connected and abutted against each other. The overall installation and disassembly are convenient and quick, and cleaning is very easy.

[0030] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, to improve and compensate for insufficient or poor mixing in the screw, this melt-enhancing mixing nozzle employs a specially designed melt-enhancing valve core 30. The melt-enhancing valve core 30 is a cylindrical structure with at least one set of mixing channels 31 axially formed around its periphery. These mixing channels 31 are composed of several grooves of varying depths connected in series, creating a mixing channel with varying cross-sections. By creating multiple grooves of varying depths around the melt-enhancing valve core 30, the plastic is better mixed and melted, effectively solving existing defects such as poor plasticization, poor color mixing, unstable melt time, difficulty in cleaning after color change, and black spots / streaks. This significantly improves injection molding quality, increases production efficiency, and reduces enterprise production costs.

[0031] In some embodiments, such as Figure 2 , Figure 3, Figure 4 and Figure 5 As shown, a plurality of mixing channels 31 are arranged at intervals along the periphery of the melting valve core 30, and each mixing channel 31 has an inlet and an outlet at both ends to connect the nozzle of the front sub-injector 10 and the inlet of the rear flange connector 20, forming at least one complete injection passage outside the melting valve core 30. As a preferred embodiment, the plurality of mixing channels 31 are distributed at equal intervals on the periphery of the melting valve core 30.

[0032] In some embodiments, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the mixing channel 31 consists of at least one first groove 32 and at least one second groove 33 connected to the first groove 32, and the depth of the first groove 32 is greater than or less than the depth of the second groove 33. Therefore, it is clear that different groove depths will inevitably create mixing nodes at the connection between the first groove 32 and the second groove 33, transitioning from a higher to a lower position or vice versa. To maximize the mixing effect, several first grooves 32 and several second grooves 33 are alternately connected to form the maximum number of mixing nodes.

[0033] In some embodiments, depending on actual production needs and mixing requirements, each of the first grooves 32 on the melting valve core 30 and / or the first grooves 32 may be straight, curved, or broken.

[0034] As one of the preferred embodiments, such as Figure 2 , Figure 3 and Figure 5 As shown, the first groove 32 and / or the first groove 32 is a straight groove, which is arranged along the length direction of the melting valve core 30.

[0035] As one of the preferred embodiments, such as Figure 2 , Figure 3 and Figure 5 As shown, the first groove 32 is disposed on at least one side of the second groove 33 and communicates with the sidewall of the second groove 33, maximizing the cross-sectional area of ​​a single mixing node and thus improving the mixing effect in a single pass. Specifically, during the operation of the melt-enhancing valve core 30, the plastic in the first groove 32 is squeezed from its sidewall through the mixing node into the second groove 33 on one side, completing one mixing pass. The plastic passes through multiple mixing nodes composed of grooves of varying depths within a mixing channel 31, completing multiple mixing passes, which can better melt and mix the plastic.

[0036] Furthermore, in another embodiment, the first groove 32 is disposed at the front or rear end of the second groove 33. In this case, the cross-sectional area of ​​the mixing node formed at the connection between the first groove 32 and the second groove 33 is the same as the cross-sectional area of ​​the groove, resulting in poor single-pass mixing effect of the plastic through this mixing node. To address this issue, by increasing the number of first grooves 32 and second grooves 33 and shortening their lengths, more mixing nodes can be constructed within a certain length of the mixing channel 31, thereby improving the mixing efficiency of the plastic.

[0037] In other embodiments, such as Figure 2 , Figure 3 and Figure 5 As shown in the figure, the mixing channel 31 also includes a third groove 34, which is connected and arranged by the first groove 32, the second groove 33 and the third groove 34 according to a certain pattern. It can be clearly seen from the figure that the third groove 34 is located between the first groove 32 and / or the second groove 33. The ends of the first groove 32 and the second groove 33 are provided with inlet and outlet ports, while the ends of the third groove 34 are not provided with inlet and outlet ports.

[0038] As one example, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the third groove 34 is disposed on at least one side of the first groove 32 and / or the second groove 33, and communicates with the sidewall of the first groove 32 and / or the second groove 33, that is, the third groove 34 is connected to the first groove 32 and / or the second groove 33 through the sidewall.

[0039] As one of the preferred embodiments, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, four sets of mixing channels 31 are spaced apart on the periphery of the melting valve core 30. The left and right ends of the mixing channels 31 extend to the front and rear end faces of the melting valve core 30, respectively, forming corresponding inlets and outlets. Figure 5 The schematic diagram shown shows that the mixing channel 31 has a centrally symmetrical structure.

[0040] Specifically, each set of mixing channels 31 consists of two first grooves 32, two second grooves 33, and one third groove 34. The depth of the first grooves 32 is greater than the depth of the second grooves 33, and the depth of the first grooves 32 is equal to the depth of the third groove 34. The first grooves 32 are staggered at both ends of the mixing channel 31 and form inlet and outlet ports at the ends. The two ends of the third groove 34 are closed and are axially spaced between the two first grooves 32. The sidewalls at both ends of the third groove 34 are connected to the sidewalls of the first grooves 32 through the second grooves 33, thereby forming a mixing node at the connection of the two sidewalls of the second grooves 33. During use, plastic is extruded from the first groove 32 at one end through the second grooves 33 and the third groove 34 of varying depths, and then extruded into the nozzle from the first groove 32 at the other end, achieving multiple tumbling and mixing within a mixing channel 31.

[0041] In some embodiments, such as Figure 4 and Figure 5 As shown, the number of mixing channels 31 is 1-20, and the number of grooves is 2-100. Preferably, the number of mixing channels 31 is 2-18, and the number of grooves is 5-80. More preferably, the number of mixing channels 31 is 4-15, and the number of grooves is 10-70. Even more preferably, the number of mixing channels 31 is 5-10, and the number of grooves is 20-60.

[0042] In some embodiments, such as Figure 3 As shown, the melting enhancement valve core 30 has tapered structures at both ends. The outer periphery of the front end of the melting enhancement valve core 30 is fitted and connected to the inner hole of the sub-nozzle 10, and the outer periphery of the rear end is fitted and connected to the inner hole of the flange connector 20. The cone angle α at both ends of the melting enhancement valve core 30 is 5-120°, preferably 30-90°, more preferably 45-75°, and more preferably 60°.

[0043] In some embodiments, the length of the melt-enhancing valve core 30 is 10-500 mm, and the outer diameter is 10-100 mm. Preferably, the length of the melt-enhancing valve core 30 is 30-450 mm, and the outer diameter is 12-80 mm. More preferably, the length of the melt-enhancing valve core 30 is 50-360 mm, and the outer diameter is 15-70 mm. More preferably, the length of the melt-enhancing valve core 30 is 100-280 mm, and the outer diameter is 18-50 mm. Even more preferably, the length of the melt-enhancing valve core 30 is 140-160 mm, and the outer diameter is 23-35 mm.

[0044] In some embodiments, the depth of the first groove 32 is 1-10 mm, the depth of the second groove 33 is 0.1-2.5 mm, and the depth of the third groove 34 is 1-10 mm. Preferably, the depth of the first groove 32 is 1.5-8 mm, the depth of the second groove 33 is 0.2-2 mm, and the depth of the third groove 34 is 1.5-8 mm. Preferably, the depth of the first groove 32 is 2-8 mm, the depth of the second groove 33 is 0.3-1.2 mm, and the depth of the third groove 34 is 2-8 mm. More preferably, the depth of the first groove 32 is 3-6 mm, the depth of the second groove 33 is 0.4-0.6 mm, and the depth of the third groove 34 is 3-6 mm.

[0045] In addition, by coating the surface of the melting valve core 30 with a protective coating, which is applied by vacuum plating of chromium nitride and titanium nitride, electroplating, etc., the wear resistance, corrosion resistance and lubrication performance of the melting valve core surface are improved, and it is less likely to have dead corners that cause black spots and black lines.

[0046] like Figure 1 As shown, the flange connector 20 of the melt-enhancing compounding nozzle of the present invention is installed on the injection molding machine material pipe and tightened. Then, a suitable heating coil and temperature sensing wire are installed to raise the temperature for production.

[0047] During the operation, before injection begins, the injection unit of the injection molding machine advances, bringing the R-shaped spherical surface at the front end of the sub-nozzle 10 into contact with and pressing it against the R-shaped spherical surface of the mold's inlet. The molten plastic, driven by the screw, is forced into the mixing channel 31 of the melt-enhancing valve core. Under the machine's injection pressure, the plastic is pushed from the first groove 32 (of varying depths) to the second groove 33 and third groove 34 (of varying depths), etc. After mixing at multiple mixing nodes, the melt-enhancing valve core 30 merges the plastic from its multiple branching mixing channels 31 into a single stream within the inner cavity of the sub-nozzle 10, and then injects it into the mold through the nozzle opening of the sub-nozzle 10. During this process, unmelted or incompletely plasticized plastic is repeatedly squeezed and mixed through the narrow gap, achieving a true melt-enhancing mixing effect.

[0048] In addition, the outside of the melting and mixing nozzle is equipped with a heating coil and a temperature sensing wire. The temperature of the plastic entering the mold can be adjusted and corrected in the computer, which can ensure that the plastic is better plasticized and fused and is not easily deteriorated or decomposed.

[0049] The specific embodiments of the present invention have been described in detail above, but they are merely examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, all equivalent transformations and modifications made without departing from the spirit and scope of the present invention should be covered within the scope of the present invention.

Claims

1. A melt-enhancing compounding nozzle, comprising a sub-nozzle, a flange connection body, and at least one melt-enhancing valve core, characterized in that, The melting valve core has a cylindrical structure, and at least one set of mixing channels is opened on its outer circumferential surface along the axial direction. The mixing channels are composed of several connected grooves. Each set of the mixing channels includes two first grooves, two second grooves, and one third groove, wherein the depth of the first groove is greater than the depth of the second groove; and the depth of the first groove is equal to the depth of the third groove. The two first grooves are staggered at both ends of the mixing channel and form inlet and outlet ports at the ends. The two ends of the third groove are closed and spaced apart along the axial direction between the two first grooves. The two second grooves are respectively disposed between the third groove and the two first grooves. The two sidewalls of the third groove are respectively connected to the sidewalls of the first groove through the second groove, thereby forming a mixing node at the connection of the two sidewalls of the second groove.

2. The melt-enhancing compounding nozzle according to claim 1, characterized in that, The number of mixing channels is 1-20.

3. The melt-enhancing compounding nozzle according to claim 1, characterized in that, The two ends of the fusion-enhancing valve core are tapered structures, and the cone angle of the tapered structure is 5-120°.

4. The melt-enhancing compounding nozzle according to claim 1, characterized in that, The length of the enhanced melting valve core is 10-500mm, and the outer diameter is 10-100mm.

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