A filter cartridge and melt filter

Abstract

This invention belongs to the field of melt filtration technology and discloses a filter cylinder and a melt filter. The filter cylinder has a first melt chamber inside a first filter cylinder. At least two guide ribs are arranged circumferentially around the central axis of the first filter cylinder on the inner wall of the first melt chamber. The guide ribs extend in a first direction, and a melt flow channel is formed between adjacent guide ribs. A second filter cylinder has a second melt chamber inside the first filter cylinder. The second filter cylinder is fixedly connected to the first filter cylinder and located within the first melt chamber. An overflow channel for connecting the first and second melt chambers is formed on the peripheral wall of the second filter cylinder. The filter screen is fixedly connected to the second filter cylinder and located within the second melt chamber, which can increase the flow velocity of high-purity melt in the first melt chamber and ensure that the high-purity melt flows uniformly and at a constant speed to the outlet, ensuring stable outlet pressure and preventing the filter cylinder from affecting the operation of downstream process equipment due to pressure fluctuations at the outlet.

Description

Technical Field

[0001] This invention relates to the field of melt filtration technology, and more particularly to a filter cartridge and a melt filter. Background Technology

[0002] For molten materials, the unmelted particulate matter and solid impurities inside affect the performance indicators of the molten material. In order to obtain high-purity molten materials, a melt filter is required to filter the melt.

[0003] In the prior art, the melt passes through the filter screen of the melt filter to be filtered, and then the melt flows to the outlet. During the flow of the melt in the filter cylinder, the melt flow through the filter screen lacks directional constraint, making it difficult for the melt to be discharged from the outlet quickly. The different volumes of melt accumulated at the outlet result in different discharge pressures at the outlet, causing large fluctuations in discharge pressure at the outlet, which affects the operation of downstream process equipment.

[0004] Therefore, there is an urgent need for a filter cartridge and melt filter to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a filter cylinder and a melt filter that can constrain the flow direction of the melt in the filter cylinder and ensure stable discharge pressure of the filter cylinder.

[0006] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, a filter cartridge is provided, the filter cartridge comprising: A first filter cylinder has a first melt cavity inside. At least two guide ribs are provided on the inner side wall of the first melt cavity, which are arranged circumferentially around the central axis of the first filter cylinder. The guide ribs extend in a first direction, and a melt flow channel is formed between two adjacent guide ribs. The second filter cartridge has a second melt cavity inside. The second filter cartridge is fixedly connected to the first filter cartridge and located inside the first melt cavity. An overflow channel for connecting the first melt cavity and the second melt cavity is opened on the peripheral side wall of the second filter cartridge. A filter screen is fixedly connected to the second filter cylinder and located inside the second melt cavity, with the peripheral sidewall of the filter screen fitting against the inner sidewall of the second melt cavity; Wherein, the first direction is the length direction of the first filter cartridge.

[0007] In some embodiments, the overflow channel includes a plurality of overflow holes, at least two of the overflow holes are arranged circumferentially around the central axis of the second filter cartridge to form a first flow channel hole group, and at least two groups of the first flow channel hole groups are arranged at intervals along the first direction.

[0008] In some embodiments, a plurality of first shear channel grooves are provided on the peripheral sidewall of the second filter cartridge, which are spaced apart along the first direction. The first shear channel grooves extend circumferentially around the central axis of the second filter cartridge. The number of the first shear channel grooves is the same as the number of the first channel hole groups, and they are arranged in a one-to-one correspondence. The overflow hole of each first channel hole group is opened in the first shear channel groove corresponding to the first channel hole group.

[0009] In some embodiments, a plurality of second shear channel grooves are provided on the inner sidewall of the second melt cavity, which are spaced apart along the first direction. The second shear channel grooves extend circumferentially around the central axis of the second filter cylinder. The number of the second shear channel grooves is the same as that of the first channel hole groups and they are arranged in a one-to-one correspondence. The overflow hole of each first channel hole group is opened in the second shear channel groove corresponding to the first channel hole group.

[0010] In some embodiments, a third melt chamber is further provided inside the first filter cartridge, the third melt chamber being connected to the first melt chamber and located on the side of the first melt chamber near the outlet end of the filter cartridge.

[0011] In some embodiments, the inner diameter of the third melt cavity is larger than the inner diameter of the first melt cavity.

[0012] In some embodiments, the second filter cartridge is located simultaneously within the first melt cavity and the third melt cavity.

[0013] In some embodiments, the peripheral sidewall of the first filter cartridge is provided with a discharge port for communicating with the third melt chamber and the outside.

[0014] In some embodiments, the overflow holes located in the first melt cavity are circumferentially spaced around the central axis of the second filter cylinder to form the first flow channel hole group, and the overflow holes located in the third melt cavity are circumferentially spaced around the central axis of the second filter cylinder to form the second flow channel hole group. The peripheral sidewall of the second filter cylinder located in the third melt cavity is divided into a shear flow channel surface and a smooth flow channel surface along a second direction. The shear flow channel surface is provided with a plurality of third shear flow channel grooves spaced along a first direction. Each third shear flow channel groove is correspondingly provided in a group of second flow channel holes. A portion of the overflow hole of each group of second flow channel holes is opened in the smooth flow channel surface, and another portion is opened in the corresponding third shear flow channel groove. The discharge port faces the smooth flow channel surface, wherein the second direction is set at an acute angle to the first direction.

[0015] Secondly, a melt filter is provided, including a feed end cap and the aforementioned filter cylinder, wherein the feed end cap is fixedly connected to the first filter cylinder, and the feed inlet of the feed end cap is in communication with the interior of the filter screen.

[0016] The beneficial effects of this invention are: The filter cartridge provided by this invention features a second melt chamber within a second filter cartridge, which is fixedly connected to a first filter cartridge and located within the first melt chamber. An overflow channel for connecting the first and second melt chambers is formed on the peripheral wall of the second filter cartridge. A filter screen is fixedly connected to the second filter cartridge and located within the second melt chamber, with its peripheral wall fitting against the inner wall of the second melt chamber. This allows the high-purity melt, formed by passing through the filter screen, to flow into the first melt chamber via the overflow channel and then towards the outlet end of the filter cartridge. Furthermore, by providing at least two [unclear characters] on the inner wall of the first melt chamber... Guide ribs are arranged circumferentially around the central axis of the first filter cylinder at intervals. The guide ribs extend along the length of the first filter cylinder, and a melt flow channel is formed between two adjacent guide ribs. The high-purity melt entering the first melt cavity flows along the melt flow channel in the first direction. The melt flow channel exerts directional constraint on the flow of high-purity melt, which can not only increase the flow speed of high-purity melt in the first melt cavity, but also ensure that the high-purity melt flows uniformly and at a uniform speed to the discharge port end, ensuring stable discharge pressure at the discharge port end, so that the filter cylinder will not affect the operation of downstream process equipment due to pressure fluctuations at the discharge port end.

[0017] The melt filter provided by the present invention includes a feed end cover and a filter cylinder. The feed end cover is fixedly connected to the first filter cylinder. The feed port of the feed end cover is connected to the inside of the filter screen, so that the discharge pressure is stable and will not affect the operation of downstream process equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the filter cartridge provided in an embodiment of the present invention; Figure 2 This is a cross-sectional schematic diagram of the filter cartridge provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the first filter cartridge provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the second filter cartridge provided in an embodiment of the present invention.

[0019] In the picture: 1. First filter cartridge; 11. First melt chamber; 12. Guide rib; 13. Melt flow channel; 14. Third melt chamber; 15. Discharge port; 2. Second filter cartridge; 21. Second melt chamber; 22. Overflow channel; 221. Overflow hole; 222. First flow channel hole group; 223. Second flow channel hole group; 23. First shear flow channel groove; 24. Second shear flow channel groove; 25. Shear flow channel surface; 26. Smooth flow channel surface; 27. Third shear flow channel groove; 3. Filter screen; 4. Heat dissipation components. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 A schematic diagram of the filter cartridge provided in this embodiment is shown. Figure 2 A cross-sectional schematic diagram of the filter cartridge provided in this embodiment is shown. Figure 3 A schematic diagram of the structure of the first filter cartridge 1 provided in this embodiment is shown. Figure 4 A schematic diagram of the structure of the second filter cartridge 2 provided in this embodiment is shown. Figures 1 to 4As shown, the present invention provides a filter cylinder, including a first filter cylinder 1, a second filter cylinder 2, and a filter screen 3. The first filter cylinder 1 has a first melt cavity 11. At least two guide ribs 12 are provided on the inner sidewall of the first melt cavity 11, which are circumferentially spaced around the central axis of the first filter cylinder 1. The guide ribs 12 extend along a first direction, and a melt flow channel 13 is formed between two adjacent guide ribs 12. The first direction is the length direction of the first filter cylinder 1. The second filter cylinder 2 has a second melt cavity 21. The second filter cylinder 2 is fixedly connected to the first filter cylinder 1 and located in the first melt cavity 11. An overflow channel 22 for connecting the first melt cavity 11 and the second melt cavity 21 is opened on the peripheral sidewall of the second filter cylinder 2. The filter screen 3 is fixedly connected to the second filter cylinder 2 and located in the second melt cavity 21. The peripheral sidewall of the filter screen 3 is in contact with the inner sidewall of the second melt cavity 21.

[0025] The filter cartridge provided in this embodiment has a second melt cavity 21 inside the second filter cartridge 2. The second filter cartridge 2 is fixedly connected to the first filter cartridge 1 and located inside the first melt cavity 11. An overflow channel 22 for connecting the first melt cavity 11 and the second melt cavity 21 is opened on the peripheral side wall of the second filter cartridge 2. A filter screen 3 is fixedly connected to the second filter cartridge 2 and located inside the second melt cavity 21. The peripheral side wall of the filter screen 3 is in contact with the inner side wall of the second melt cavity 21, so that after the melt passes through the filter screen 3 to form a high-purity melt, the high-purity melt can flow into the first melt cavity 11 through the overflow channel 22, and then flow to the discharge port end of the filter cartridge; through the inner side wall of the first melt cavity 11... At least two guide ribs 12 are arranged circumferentially around the central axis of the first filter cylinder 1. The guide ribs 12 extend along the length of the first filter cylinder 1, and a melt flow channel 13 is formed between two adjacent guide ribs 12. The high-purity melt entering the first melt cavity 11 flows along the melt flow channel 13 in the first direction. The melt flow channel 13 imposes directional constraints on the flow of high-purity melt, which can not only increase the flow speed of high-purity melt in the first melt cavity 11, but also ensure that the high-purity melt flows uniformly and at a uniform speed to the discharge port end, ensuring that the discharge pressure at the discharge port end is stable, so that the filter cylinder will not affect the operation of downstream process equipment due to pressure fluctuations at the discharge port end.

[0026] It should be noted that the number of guide ribs 12 in this embodiment is not limited, and can be two, three, four, five, ten, or even more. Those skilled in the art can set them reasonably according to the actual needs of the filter cartridge, which will not be elaborated here.

[0027] It should be noted that the melt flow channel 13 guides the flow direction of the high-purity melt within the first melt cavity 11, thereby shortening the high-temperature residence time of the high-purity melt, avoiding the critical time of polymer chain thermal degradation of the high-purity melt, reducing the generation of polymer chain-breaking products, and thus improving the chemical properties of the melt.

[0028] like Figure 2 and Figure 4 As shown, the overflow channel 22 includes a plurality of overflow holes 221. At least two overflow holes 221 are arranged circumferentially around the central axis of the second filter cylinder 2 to form a first flow channel hole group 222. At least two groups of first flow channel hole groups 222 are arranged at intervals along a first direction, so that the melt in the second melt cavity 21 can flow into the first melt cavity 11 evenly from various parts of the second melt cavity 21 through the corresponding overflow holes 221 after passing through the filter screen 3, preventing the local melt pressure in the first melt cavity 11 from being too high, which would make it difficult for the high-purity melt to flow uniformly to the outlet end.

[0029] It should be noted that the number of overflow holes 221 and the number of first flow channel hole groups 222 are not limited here. Those skilled in the art can set them reasonably according to the actual needs of the filter cartridge, and will not be elaborated here.

[0030] Preferably, the peripheral wall of the second filter cylinder 2 is provided with a plurality of first shear channel grooves 23 spaced apart along a first direction. The first shear channel grooves 23 extend circumferentially around the central axis of the second filter cylinder 2. The number of first shear channel grooves 23 is the same as that of the first channel hole groups 222 and they are arranged in a one-to-one correspondence. The overflow hole 221 of each first channel hole group 222 is opened in the first shear channel groove 23 corresponding to the first channel hole group 222. Thus, after the high-purity melt flows into the first melt cavity 11 through the overflow hole 221, if the overflow hole 221 is not directly aligned with the melt channel 13, the high-purity melt can move around the central axis of the second filter cylinder 2 within the first shear channel groove 23. The melt flows in a circumferential direction. After flowing to the first shear channel groove 23 directly opposite the melt channel 13, it flows into the melt channel 13 again, which improves the efficiency of the high-purity melt flowing into the melt channel 13 and prevents the overflow hole 221 that is not directly opposite the melt channel 13 from being blocked due to the high-purity melt failing to flow into the melt channel 13 in time. At the same time, during the flow of the high-purity melt in the first shear channel groove 23, the polymer chain segments of the high-purity melt untangle the molecular chain, reduce the melt viscosity, improve the fluidity, reduce the processing energy consumption, and promote the molecular diffusion and dispersion of additives, masterbatches and matrix resin in the melt, thereby improving the mechanical properties and appearance consistency of the high-purity melt.

[0031] Preferably, a plurality of second shear channel grooves 24 are provided on the inner sidewall of the second melt cavity 21, which are spaced apart along the first direction. The second shear channel grooves 24 extend circumferentially around the central axis of the second filter cylinder 2. The number of second shear channel grooves 24 is the same as that of the first channel hole groups 222, and they are arranged in a one-to-one correspondence. The overflow hole 221 of each first channel hole group 222 is opened in the second shear channel groove 24 corresponding to the first channel hole group 222. Thus, after the melt is filtered by the filter screen 3, if the high-purity melt is not directly facing the overflow hole 221, the high-purity melt can flow circumferentially around the central axis of the second filter cylinder 2 in the second shear channel groove 24. After the high-purity melt flows to the overflow hole 221, it flows into the overflow hole 221.

[0032] like Figure 2 and Figure 3 As shown, a third melt chamber 14 is also provided inside the first filter cartridge 1. The third melt chamber 14 is connected to the first melt chamber 11 and is located on the side of the first melt chamber 11 near the outlet end of the filter cartridge. This allows the high-purity melt to flow into the third melt chamber 14 first and then out of the outlet end when it flows along the length of the first filter cartridge 1 in the melt flow channel 13. This allows the high-purity melt in different melt flow channels 13 to mix again in the third melt chamber 14, extending the mixing path of the high-purity melt and further homogenizing the high-purity melt. This improves the uniformity of the high-purity melt in terms of temperature and composition, and enhances the product quality of the high-purity melt.

[0033] Preferably, the inner diameter of the third melt chamber 14 is larger than that of the first melt chamber 11, which reduces the flow velocity of the high-purity melt when it flows into the third melt chamber 14. According to Bernoulli's equation, when the melt enters the large-diameter expansion section from the small cross-section, the flow velocity decreases sharply, and the dynamic pressure is converted into static pressure, thus dissipating pressure energy. This allows the high-purity melt in the third melt chamber 14 to be discharged from the filter cartridge after mixing and homogenization, under the pressure of the high-purity melt flowing in the first melt chamber 11. Meanwhile, the high-purity melt flow velocity in the first melt chamber 11 is uniform, resulting in small pressure fluctuations at the filter outlet 15, which will not affect the operation of downstream process equipment. This provides linear and pulsation-free melt delivery conditions for downstream equipment, solving the industry pain point of downstream operational instability caused by pressure fluctuations at the outlet of traditional filters.

[0034] Continue as Figure 2 and Figure 3 As shown, the second filter cartridge 2 is located in both the first melt cavity 11 and the third melt cavity 14, so that the high-purity melt in the second melt cavity 21 has two flow channels. In the first flow channel, the high-purity melt flows into the second melt cavity 21 through the overflow hole 221, then flows into the melt flow channel 13 through the first shear flow channel groove 23, and then flows into the third melt cavity 14. In the second flow channel, the high-purity melt flows directly into the third melt cavity 14 through the overflow hole 221, thereby improving the efficiency of the high-purity melt flowing from the second melt cavity 21 into the third melt cavity 14.

[0035] Continue as Figure 2 and Figure 3 As shown, the peripheral wall of the first filter cylinder 1 is provided with a discharge port 15 for connecting the third melt chamber 14 and the outside, so that the melt in the third melt chamber 14 can be discharged from the filter cylinder. At the same time, the discharge port 15 is opened on the peripheral wall of the first filter cylinder 1, thereby changing the flow direction of the high-purity melt. After the high-purity melt flows into the third melt chamber 14, the flow rate can be reduced, and it is pushed out of the discharge port 15 by the high-purity melt located in the melt flow channel 13, so that the discharge pressure at the discharge port 15 is stable and does not fluctuate.

[0036] like Figures 1 to 4 As shown, overflow holes 221 located in the first melt cavity 11 are arranged circumferentially around the central axis of the second filter cylinder 2 to form a first flow channel hole group 222. Overflow holes 221 located in the third melt cavity 14 are arranged circumferentially around the central axis of the second filter cylinder 2 to form a second flow channel hole group 223. The peripheral sidewall of the second filter cylinder 2 located in the third melt cavity 14 is divided into a shear flow channel surface 25 and a smooth flow channel surface 26 along the second direction. The shear flow channel surface 25 is provided with a plurality of third shear flow channel grooves 27 arranged at intervals along the first direction. The third shear flow channel grooves 27 extend circumferentially around the central axis of the second filter cylinder 2. Each third shear flow channel groove 27 is correspondingly provided in a... The second flow channel hole group 223 has an overflow hole 221 in which a portion is opened on the smooth flow channel surface 26 and another portion is opened in the corresponding third shear flow channel groove 27. The discharge port 15 faces the smooth flow channel surface 26, and the second direction is set at an acute angle to the first direction. This allows the high-purity melt flowing out of the smooth flow channel surface 26 to accumulate at the discharge port 15. The high-purity melt flowing out of the shear flow channel surface 25 can move circumferentially around the central axis of the second filter cylinder 2 along the third indirect flow channel groove to the smooth flow channel surface 26, preventing the high-purity melt from accumulating in the gap between the shear flow channel surface 25 and the third melt cavity 14 and undergoing long-term heat deformation.

[0037] When the melt filter stops operating, the melt inside the filter cartridge stops flowing, and the temperature of the melt filter is difficult to lower quickly. If the stagnant melt is heated for a prolonged period, it is highly susceptible to denaturation. To solve the above technical problems, such as... Figure 2 As shown, the filter cartridge also includes a heat dissipation component 4, which is fixedly connected to the peripheral sidewall of the first filter cartridge 1. This increases the heat dissipation area of ​​the first filter cartridge 1 and prevents the high-purity melt properties from changing due to excessively high filter cartridge temperature. Specifically, the heat dissipation component 4 is a heat dissipation flange, and several heat dissipation flanges are spaced apart along the first direction to increase the heat dissipation area of ​​the first filter cartridge 1.

[0038] In some embodiments, the heat sink 4 can also be a heat sink, which is directly fixedly connected to the first filter cartridge 1. The volume of the heat sink can be changed according to the actual heat dissipation requirements of the first filter cartridge 1, thereby adjusting the heat dissipation efficiency of the filter cartridge.

[0039] The present invention also provides a melt filter, including a feed end cover and a filter cylinder. The feed end cover is fixedly connected to the first filter cylinder 1, and the feed port of the feed end cover is connected to the interior of the filter screen 3, so that the discharge pressure is stable and will not affect the operation of downstream process equipment.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A filter cartridge, characterized in that, The filter cartridge includes: A first filter cylinder (1) is provided inside the first filter cylinder (1). At least two guide ribs (12) are provided on the inner side wall of the first melt cavity (11) and are arranged circumferentially around the central axis of the first filter cylinder (1). The guide ribs (12) extend in a first direction and a melt flow channel (13) is formed between two adjacent guide ribs (12). The second filter cylinder (2) is provided with a second melt cavity (21). The second filter cylinder (2) is fixedly connected to the first filter cylinder (1) and located in the first melt cavity (11). An overflow channel (22) for connecting the first melt cavity (11) and the second melt cavity (21) is provided on the peripheral side wall of the second filter cylinder (2). The filter screen (3) is fixedly connected to the second filter cylinder (2) and located in the second melt cavity (21). The peripheral sidewall of the filter screen (3) is in contact with the inner sidewall of the second melt cavity (21). Wherein, the first direction is the length direction of the first filter cartridge (1).

2. The filter cartridge according to claim 1, characterized in that, The overflow channel (22) includes a plurality of overflow holes (221), at least two of the overflow holes (221) are arranged circumferentially around the central axis of the second filter cartridge (2) to form a first flow channel hole group (222), and at least two groups of the first flow channel hole groups (222) are arranged at intervals along the first direction.

3. The filter cartridge according to claim 2, characterized in that, The second filter cylinder (2) has a plurality of first shear channel grooves (23) spaced apart along the first direction on its peripheral sidewall. The first shear channel grooves (23) extend circumferentially around the central axis of the second filter cylinder (2). The number of the first shear channel grooves (23) is the same as that of the first channel hole group (222) and they are arranged in a one-to-one correspondence. The overflow hole (221) of each first channel hole group (222) is opened in the first shear channel groove (23) corresponding to the first channel hole group (222).

4. The filter cartridge according to claim 2, characterized in that, The inner wall of the second melt cavity (21) is provided with a plurality of second shear channel grooves (24) spaced apart along the first direction. The second shear channel grooves (24) extend circumferentially around the central axis of the second filter cylinder (2). The number of the second shear channel grooves (24) is the same as that of the first channel hole group (222) and they are arranged in a one-to-one correspondence. The overflow hole (221) of each first channel hole group (222) is opened in the second shear channel groove (24) corresponding to the first channel hole group (222).

5. The filter cartridge according to claim 2, characterized in that, The first filter cartridge (1) is also provided with a third melt chamber (14), which is connected to the first melt chamber (11) and located on the side of the first melt chamber (11) near the outlet end of the filter cartridge.

6. The filter cartridge according to claim 5, characterized in that, The inner diameter of the third melt cavity (14) is larger than the inner diameter of the first melt cavity (11).

7. The filter cartridge according to claim 5, characterized in that, The second filter cartridge (2) is located in both the first melt chamber (11) and the third melt chamber (14).

8. The filter cartridge according to claim 5, characterized in that, The first filter cartridge (1) has a discharge port (15) on its peripheral sidewall for connecting the third melt cavity (14) and the outside.

9. The filter cartridge according to claim 8, characterized in that, The overflow holes (221) located in the first melt cavity (11) are arranged circumferentially around the central axis of the second filter cylinder (2) to form the first flow channel hole group (222). The overflow holes (221) located in the third melt cavity (14) are arranged circumferentially around the central axis of the second filter cylinder (2) to form the second flow channel hole group (223). The peripheral sidewall of the second filter cylinder (2) located in the third melt cavity (14) is divided into a shear flow channel surface (25) and a smooth flow channel surface (26) along the second direction. The shear flow channel surface (25) is provided with a plurality of flow channels along the first direction. The third shear channel groove (27) is arranged at intervals. The third shear channel groove (27) extends circumferentially around the central axis of the second filter cylinder (2). Each third shear channel groove (27) is correspondingly arranged in a group of second channel holes (223). The overflow hole (221) of each second channel hole group (223) is partially opened in the smooth channel surface (26) and partially opened in the corresponding third shear channel groove (27). The discharge port (15) faces the smooth channel surface (26), wherein the second direction is set at an acute angle to the first direction.

10. A melt filter, characterized in that, It includes a feed end cap and a filter cylinder as described in any one of claims 1-9, wherein the feed end cap is fixedly connected to the first filter cylinder (1), and the feed inlet of the feed end cap is in communication with the interior of the filter screen (3).

Images