Polymer filter, center post for polymer filter, and manufacturing method of polymer molding

Abstract

To provide an outer flow-type center post in a polymer filter, capable of reducing a thermal influence on a polymer.SOLUTION: A polymer filter includes a container body, a disk type filter, and a center post. The container body has a polymer introduction port, an introduction flow passage, and a housing space, where the disk type filter and the center post are accommodated in the housing space. The disk type filter has an open hole at the center and is accommodated in the housing space in a state of having the center post inserted thereinto. The center post has a plurality of grooves on an outer peripheral surface opposed to the disk type filter on the upstream side, has a hollow lead-out passage in the inside in the downstream side, and has a plurality of confluent channels heading to an upstream end part of the lead-out passage from the downstream end part of each of the plurality of grooves; a region where the upstream end part of the lead-out passage communicates with the downstream end part of the confluent channel is a confluent part; and an opening of an end part on the downstream side of the lead-out passage is a polymer lead-out port. The center post further has a hollow temperature adjustment channel where a solvent passes in a neighbor of the confluent part.SELECTED DRAWING: Figure 5B

Description

[Technical Field]

[0001] The present invention relates to a polymer filter, a center post for a polymer filter, and a method for producing a polymer molded article. [Background technology]

[0002] When producing polymer molded articles such as threads and films, the polymer is melted and filtered to remove foreign matter before being subjected to a molding process. Polymer filters are generally used to filter polymers. A polymer filter includes a container containing a disk-shaped filter and a center post supporting the filter. When molten polymer is introduced into the container of the polymer filter through an inlet, the molten polymer flows into the disk-shaped filter via an inlet channel. The polymer, filtered by passing through the disk-shaped filter, flows into the center post, passes through the center post, and is discharged from an outlet for use in molding (Patent Documents 1 and 2).

[0003] The center post has a configuration called an outer flow type (Patent Documents 3 and 4). A specific example will be described below, where the side into which the polymer is introduced is the upstream side and the side from which the polymer is discharged is the downstream side. That is, an outer flow type center post has multiple grooves on the outer peripheral surface on the upstream side along the axial direction, and a hollow discharge channel inside on the downstream side, with the downstream ends of the multiple grooves communicating with the discharge channel via a confluence channel. When the outer flow type center post is used, the polymer filtered by the disk-type filter moves downstream through the multiple grooves on the outer peripheral surface of the center post, flows from each groove through each confluence channel into the internal discharge channel, and is discharged from the downstream end of the discharge channel. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6851847 [Patent Document 2] Patent No. 7140948 [Patent Document 3] Patent No. 5234728 [Patent Document 4] Japanese Patent Application Laid-Open No. 2001-9214 Summary of the Invention [Problem to be solved by the invention]

[0005] When using the polymer filter equipped with the external flow type center post, the polymer discharged and the molded article using the polymer may suffer from degradation such as gelation, burning, discoloration, streaks, etc. As a result of extensive research, the inventors have discovered that the cause of this is thermal degradation of the polymer when the center post is moved.

[0006] SUMMARY OF THE INVENTION An object of the present invention is to provide an outer flow type center post in a polymer filter that can reduce the influence of heat on the polymer. [Means for solving the problem]

[0007] In order to achieve the above object, the polymer filter of the present invention comprises: Includes a container body, a disc-shaped filter, and a center post; The container body is a polymer inlet, an inlet flow path communicating with the inlet, and a storage space communicating with the inlet flow path; The disk-shaped filter and the center post are accommodated in the accommodation space; The disk-type filter is Has a central through hole; The container is accommodated in the accommodation space of the container body with the center post inserted into the through hole; The center post is The outer peripheral surface of the disk-type filter, facing the upstream side in the axial direction, has a plurality of grooves along the axial direction, a hollow outlet flow path extending in the axial direction is provided inside the downstream side in the axial direction, a plurality of confluent flow paths extending from the downstream ends of the plurality of grooves toward the upstream end of the outlet flow path; a confluence portion is a region where an upstream end of the outlet flow path communicates with downstream ends of the plurality of confluence flow paths, an opening at a downstream end of the outlet flow path is an outlet for the polymer; The center post is Further, a hollow temperature control flow path through which the solvent passes is provided near the confluence, The temperature adjustment flow path is not in communication with the outlet flow path and the junction flow path. It is characterized by:

[0008] The center post of the present invention is The outer peripheral surface has a plurality of grooves extending in the axial direction on the upstream side in the axial direction, a hollow outlet flow path extending in the axial direction is provided inside the downstream side in the axial direction, a plurality of confluent flow paths extending from the downstream ends of the plurality of grooves toward the upstream end of the outlet flow path; a confluence portion is a region where an upstream end of the outlet flow path communicates with downstream ends of the plurality of confluence flow paths, Further, a hollow temperature control flow path through which the solvent passes is provided near the confluence, the temperature adjustment flow path is not in communication with the outlet flow path and the merging flow path; The polymer filter of the present invention is characterized by its use.

[0009] The method for producing a polymer molded article of the present invention comprises the steps of: filtering a molten polymer using the polymer filter of the present invention; and The method is characterized by including a step of molding the molten polymer after filtration. [Effects of the Invention]

[0010] The polymer filter of the present invention can reduce the thermal effect on the polymer when it passes through the center post, thereby reducing, for example, thermal degradation of the polymer after filtration, which can lead to prevention of deterioration in the quality of the polymer molded product. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a cross-sectional view of a polymer filter according to a first embodiment. [Figure 2] FIG. 2 is a perspective view of the disk-type filter according to the first embodiment. [Figure 3A] FIG. 3A is a side view of the center post in the first embodiment. [Figure 3B] FIG. 3B is a perspective view of the center post in the first embodiment. [Figure 3C] FIG. 3C is a perspective view of the center post in the first embodiment. [Figure 4A] FIG. 4(A) is a partial perspective view of each flow path of the center post in the first embodiment. [Figure 4B] FIG. 4B is a cross-sectional view of each flow path of the center post in the first embodiment. [Figure 4C] FIG. 4C is a plan view of each region of the center post in the first embodiment. [Figure 5A] FIG. 5A is a perspective view of the temperature control channel of the center post in the first embodiment. [Figure 5B] FIG. 5B is a partial perspective view of the center post in the first embodiment. [Figure 6A] FIG. 6(A) is a perspective view of the temperature control channel of the center post in the second embodiment. [Figure 6B] FIG. 6B is a partial perspective view of the center post in the second embodiment. [Figure 7] FIG. 7 is a partial perspective view of the center post in the third embodiment. [Figure 8A]FIG. 8(A) is a perspective view of the temperature control channel of the center post in the third embodiment. [Figure 8B] FIG. 8B is a perspective view of the center post in the third embodiment. [Figure 9] FIG. 9 is a perspective view of the temperature control channel of the center post in the embodiment 4-1. [Figure 10] FIG. 10 is a partial perspective view of the center post in the embodiment 4-1. [Figure 11] FIG. 11 is a perspective view of the temperature control channel of the center post in the embodiment 4-2. [Figure 12] FIG. 12 is a partial perspective view of the center post in the embodiment 4-2. [Figure 13A] FIG. 13(A) is a perspective view of the temperature control channel of the center post in embodiment 5-1. [Figure 13B] FIG. 13(B) is a partial perspective view of the center post in embodiment 5-1. [Figure 13C] FIG. 13(C) is a partial plan view of the center post in embodiment 5-1. [Figure 14A] FIG. 14(A) is a perspective view of the temperature control channel of the center post in embodiment 5-2. [Figure 14B] FIG. 14(B) is a partial perspective view of the center post in embodiment 5-2. [Figure 14C] FIG. 14(C) is a partial plan view of the center post in embodiment 5-2. [Figure 15A] FIG. 15(A) is a perspective view of the temperature control channel of the center post in embodiment 5-3. [Figure 15B] FIG. 15(B) is a partial perspective view of the center post in embodiment 5-3. [Figure 15C] FIG. 15(C) is a partial plan view of the center post in embodiment 5-3. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention includes, for example, the following aspects. [1] Includes a container body, a disc-shaped filter, and a center post; The container body is a polymer inlet, an inlet flow path communicating with the inlet, and a storage space communicating with the inlet flow path; The disk-shaped filter and the center post are accommodated in the accommodation space; The disk-type filter is Has a central through hole; The container is accommodated in the accommodation space of the container body with the center post inserted into the through hole; The center post is The outer peripheral surface of the disk-type filter, facing the upstream side in the axial direction, has a plurality of grooves along the axial direction, a hollow outlet flow path extending in the axial direction is provided inside the downstream side in the axial direction, a plurality of confluent flow paths extending from the downstream ends of the plurality of grooves toward the upstream end of the outlet flow path; a confluence portion is a region where an upstream end of the outlet flow path communicates with downstream ends of the plurality of confluence flow paths, an opening at a downstream end of the outlet flow path is an outlet for the polymer; The center post is Further, a hollow temperature control flow path through which the solvent passes is provided near the confluence, The temperature adjustment flow path is not in communication with the outlet flow path and the junction flow path. A polymer filter characterized by: [2] The polymer filter according to [1], wherein the temperature adjustment flow path is a flow path that runs from the downstream side of the confluence, passes through the upstream side of the confluence, and returns to the downstream side. [3] The temperature control flow path is a flow path that passes from the downstream side of the confluence section between adjacent confluence flow paths, passes through the upstream side of the confluence section, and returns to the downstream side. [1] The polymer filter described in [2]. [4] The temperature control flow path is a flow path that passes from the downstream side of the confluence section between a pair of adjacent confluence flow paths, passes through the upstream side of the confluence section, passes through another pair of adjacent confluence flow paths, and returns to the downstream side. A polymer filter described in any one of [1] to [3]. [5] The polymer filter according to any one of [1] to [4], wherein the temperature control flow path is two or more. [6] The polymer filter according to any one of [1] to [5], wherein two or more of the temperature control flow paths intersect with each other upstream of the junction. [7] The temperature adjustment channel is a branched flow path including a plurality of hollow regions, The polymer filter according to any one of [1] to [6], wherein the plurality of hollow regions communicate with each other at their ends on the confluence side, upstream of the confluence. [8] The center post is: Furthermore, a space is provided as a liquid reservoir on the upstream side of the confluence, The polymer filter according to any one of [1] to [7], wherein the temperature control flow path is in communication with the liquid reservoir. [9] The polymer filter according to any one of [1] to [8], wherein the number of the grooves is 2 to 20.

[0013]

[10] On the upstream side in the axial direction, the outer peripheral surface has a plurality of grooves along the axial direction, a hollow outlet flow path extending in the axial direction is provided inside the downstream side in the axial direction, a plurality of confluent flow paths extending from the downstream ends of the plurality of grooves toward the upstream end of the outlet flow path; a confluence portion is a region where an upstream end of the outlet flow path communicates with downstream ends of the plurality of confluence flow paths, Further, a hollow temperature control flow path through which the solvent passes is provided near the confluence, the temperature adjustment flow path is not in communication with the outlet flow path and the merging flow path; [1] to [9] are used in the polymer filter. A center post for a polymer filter.

[11] A step of filtering a molten polymer using the polymer filter according to any one of [1] to [9]; and and forming the molten polymer after filtration. A method for producing a polymer molded article, comprising:

[0014] Unless otherwise specified, terms used in this specification can be used in the sense commonly used in the art.

[0015] The present invention will be described below with reference to specific examples, but is not limited to these examples. The examples in each invention can be used interchangeably.

[0016] [Polymer filter] As described above, the polymer filter of the present invention has the following features: Includes a container body, a disc-shaped filter, and a center post; The container body is a polymer inlet, an inlet flow path communicating with the inlet, and a storage space communicating with the inlet flow path; The disk-shaped filter and the center post are accommodated in the accommodation space; The disk-type filter is Has a central through hole; The container is accommodated in the accommodation space of the container body with the center post inserted into the through hole; The center post is The outer peripheral surface of the disk-type filter, facing the upstream side in the axial direction, has a plurality of grooves along the axial direction, a hollow outlet flow path extending in the axial direction is provided inside the downstream side in the axial direction, a plurality of confluent flow paths extending from the downstream ends of the plurality of grooves toward the upstream end of the outlet flow path; a confluence portion is a region where an upstream end of the outlet flow path communicates with downstream ends of the plurality of confluence flow paths, an opening at a downstream end of the outlet flow path is an outlet for the polymer; The center post is Further, a hollow temperature control flow path through which the solvent passes is provided near the confluence, The temperature adjustment flow path is not in communication with the outlet flow path and the junction flow path. It is characterized by:

[0017] In the present invention, the direction from the inlet to the outlet of the polymer filter is referred to as the polymer flow direction, and in the flow direction, the inlet side is referred to as the upstream side, and the outlet side is referred to as the downstream side. In the present invention, the axial direction of the center post is, for example, the same direction as the polymer flow direction.

[0018] Specific examples of the present invention will be described below with reference to the drawings. In each drawing, the same parts are assigned the same reference numerals. Drawings surrounded by dotted lines indicate partial drawings. The present invention is not limited in any way by the following embodiments. The descriptions of each embodiment can be mutually incorporated unless otherwise specified.

[0019] (Embodiment 1) An example of the basic structure of the polymer filter of this embodiment is shown in the schematic diagram of Figure 1. In Figure 1, details of the temperature control flow path in the center post are omitted and will be described later using other figures.

[0020] 1 is a schematic diagram of a polymer filter 1, showing some of the components in cross section. The purpose of FIG. 1 is to explain the positional relationship of the components of the polymer filter 1 and the flow of polymer, and the polymer filter is not limited to this configuration.

[0021] The polymer filter 1 includes a container body 10, a disk-shaped filter 20, and a center post 30. In Fig. 1, arrow F indicates the direction from the polymer inlet to the polymer outlet of the polymer filter 1, which is referred to as the polymer flow direction throughout the polymer filter 1. In the polymer filter 1, the container body 10 side is the upstream side, and the center post 30 side is the downstream side. In Fig. 1, the dotted arrows indicate the direction of polymer progression at each location.

[0022] The container body 10 has a polymer inlet 11, an introduction flow path 14 communicating with the inlet 11, and a storage space 13 communicating with the introduction flow path 14. In the container body 10, the downstream side of the storage space 13 is an opening 13a. The disk-type filter 20 and the support 301 of the center post 30 are housed in the storage space 13 of the container body 10, and the opening 13a of the storage space 13 is closed by the base 302 of the center post 30 serving as a lid. In the polymer filter 1, the opening at the downstream end of the center post 30 is an outlet 33 for the polymer.

[0023] The disk-type filter 20 includes a plurality of filtration elements 21. An example of the disk-type filter 20 is shown in a perspective view in FIG. 2. As shown in FIG. 2, the disk-type filter 20 includes a plurality of filtration elements 21 stacked with partitions 22 interposed therebetween. The filtration elements 21 are disk-shaped with a hole 211 in the center, and the filtration elements 21 are stacked with the holes 211 aligned. Therefore, the disk-type filter 20 has a through-hole 23 in the center along the stacking direction of the filtration elements 21. In the polymer filter 1, the support 301 of the center post 30 is inserted into the through-hole 23 of the disk-type filter 20. The disk-type filter 20 is also called, for example, a leaf disk filter (LDF).

[0024] The filtration element 21 is, for example, formed by stacking two doughnut-shaped filtration members with a hole in the center so that they face each other with a support member interposed therebetween. The two doughnut-shaped filtration members are fixed to each other at their outer peripheries and at their inner peripheries. The filtration members may be any filtration members capable of filtering molten polymer, and a specific example of such a filtration member is a porous sintered body. The raw material of the sintered body is not particularly limited, and examples thereof include metals and ceramics. The support member may be, for example, a metal mesh member.

[0025] According to the disc-type filter 20 having the filtration element 21, for example, polymers are filtered by passing from the outside to the inside of the filtration element 21. The filtered polymers pass through the inside of the filtration element 21 and are discharged to the outside of the disc-type filter 20 through the central hole 211 (the through-hole 23 of the disc-type filter 20).

[0026] The center post 30 (also referred to as the center pole) is of the external flow type as described above. FIGS. 3 and 4 show an example of a schematic diagram of the basic structure of the center post 30. Details of the temperature control flow channels in the center post 30 are omitted from FIGS. 3 and 4 and will be described later using other figures. FIG. 3(A) is a side view of the center post 30 along the axial direction, FIG. 3(B) is a perspective view of the center post 30 as viewed from the upstream side, and FIG. 3(C) is a perspective view of the center post 30 as viewed from the downstream side. FIG. 4 is a schematic diagram of the center post 30, showing only the flow channels in region A of FIG. 3(A). Specifically, FIG. 4(A) is a perspective view of the flow channels in region A as viewed from the downstream side. FIG. 4(B) is a cross-sectional view of the flow channels in region A near the junction 35 as viewed from the upstream side, and FIG. 4(C) is a plan view of the flow channels in region A as viewed from the downstream side.

[0027] The center post 30 has a support 301 and a base 302. In this embodiment, the support 301 and the base 302 are shown as an integrated unit, but the present invention is not limited to this. The center post 30 may be separate components, such as a base and a support, and the base may have a through-hole in the flow direction, into which the support is inserted. In this embodiment, the axial direction of the center post 30 is the axial direction of the support 301, which may also be referred to as the flow direction, for example.

[0028] The center post 30 has multiple grooves 31 extending along the axial direction on the upstream side of the outer circumferential surface, i.e., on the outer circumferential surface of the support 301. The center post 30 of this embodiment has four grooves 31a, 31b, 31c, and 31d as an example of the multiple grooves 31, as shown in FIGS.

[0029] The number of grooves in the center post 30 is not particularly limited and is two or more, and specific examples include 2 to 20, 2 to 15, 2 to 12, 2 to 10, 2 to 8, and 2 to 6. In the center post 30, the positions of the multiple grooves in the circumferential direction of the support 301 are not particularly limited and may be, for example, evenly spaced or unevenly spaced, with even spacing being preferable. In this embodiment, the grooves in the center post 30 are formed at equal intervals in the circumferential direction.

[0030] The center post 30 has a hollow outlet flow path 32 extending in the axial direction inside on the downstream side in the axial direction. The opening at the downstream end of the outlet flow path 32 is the polymer outlet 33 for the polymer filter 1.

[0031] As shown in Fig. 4, the center post 30 has a plurality of confluent flow paths 34 (34a, 34b, 34c, 34d) extending from the downstream ends of the plurality of grooves 31 (31a, 31b, 31c, 31d) toward the upstream end of the outlet flow path 32. The multiple confluent flow paths 34 merge at their respective downstream ends (341a, 341b, 341c, 341d) and communicate with the outlet flow path 32 at its upstream end. The region where the multiple confluent flow paths 34 merge is called a confluent portion 35.

[0032] The polymer filter 1 is typically disposed between a feeder that supplies molten polymer and a molding machine having a mold for polymer molding. The molten polymer is introduced from the feeder into the polymer filter 1 through an inlet 11 and flows downstream through an inlet flow path 14. The polymer flowing through the inlet flow path 14 flows from the outer periphery of the disc-type filter 20 to the inside and is filtered. The polymer filtered by the disc-type filter 20 is discharged from the inner periphery of the disc-type filter 20. The support 301 of the center post 30 is inserted into the central through-hole 23 of the disc-type filter 20, and the outer periphery of the support 301 has multiple grooves 31, as described above. Therefore, the polymer discharged from the disc-type filter 20 enters the grooves 31 of the center post 30 and moves downstream. The polymer flowing through the multiple grooves 31 then flows through the respective confluence flow paths 34, merges at a confluence 35, and flows into a single discharge flow path 32. The polymer that has flowed into the outlet flow path 32 moves further downstream and is discharged to the outside from an opening (outlet port 33) at the downstream end of the outlet flow path 32. The filtered polymer discharged from the polymer filter 1 is introduced, for example, into a mold of the molding machine, and a polymer molded body is produced.

[0033] In the case of an external flow type center post 30, as shown in FIG. 4, the polymer flowing through the four grooves 31 flows through four confluence channels 34 into a single confluence 35 at the upstream end of the outlet channel 32. As a result, when the polymer passes through the confluence 35, heat (shear heating) may be generated at the confluence 35. However, the center post 30 of this embodiment further includes a temperature control channel 40, which can suppress shear heating. The temperature control channel 40 of the center post 30 of this embodiment will be further described using the drawings.

[0034] Fig. 5 shows an outline of the temperature control flow path 40 of the center post 30. Fig. 5(A) is a perspective view showing the gaps of the temperature control flow path 40 (41, 42), and Fig. 5(B) is a perspective view in which the gaps of the temperature control flow path 40 (41, 42) are further added to the configuration of Fig. 4(A).

[0035] The center post 30 of this embodiment has two temperature control flow paths 40 (41, 42). Each temperature control flow path 40 is a flow path that runs from the downstream side of the junction 35, passes through an upstream region 37 of the junction 35, and returns to the downstream side. Each temperature control flow path 40 (41, 42) has a turn-back structure in the upstream region 37 that returns to the downstream side, and these are called turn-back portions 411, 421.

[0036] Specifically, one temperature control flow path 41 extends upstream from the outlet 33 side, passes between junction flow path 34b and junction flow path 34a, the upstream region 37, and between junction flow path 34a and junction flow path 34d, and then returns toward the downstream side where the outlet 33 is located. That is, the temperature control flow path 41 passes through the upstream region 37, sandwiching the junction flow path 34a therebetween. The other temperature control flow path 42 extends upstream from the outlet 33 side, passes between junction flow path 34d and junction flow path 34c, the upstream region 37, and between junction flow path 34c and junction flow path 34b, and then returns toward the downstream side where the outlet 33 is located. That is, the temperature control flow path 42 passes through the upstream region 37, sandwiching the junction flow path 34c therebetween. In the upstream region 37, the turning portion 411 of the temperature control flow path 41 and the turning portion 421 of the temperature control flow path 42 are positioned at different positions in the vertical direction, and are not in communication with each other.

[0037] The temperature control flow path 40 is a flow path through which a solvent passes to adjust the temperature of the confluence 35. The type of solvent is not particularly limited, and a liquid solvent that can be easily cooled and heated is preferred. Specific examples of the solvent include aqueous solvents such as water, oil-based solvents, ionic liquids, and mixtures thereof. The oil-based solvent can be, for example, a heat transfer oil, and specific examples include silicone oil, the Barrel Therm series (manufactured by Matsumura Oil Co., Ltd.), and Daphne Thermic Oil (manufactured by Idemitsu Kosan Co., Ltd.). When the temperature of the confluence 35 exceeds the set temperature, the confluence 35 can be cooled by, for example, introducing a solvent adjusted (cooled) to a temperature lower than the set temperature into one opening of the temperature control flow path 40 and discharging it from the other opening. Conversely, when the temperature of the confluence 35 becomes higher than the set temperature, the confluence 35 can be heated, for example, by introducing a solvent adjusted (heated) to a temperature higher than the set temperature from one opening (inlet) of the temperature adjustment flow path 40 and discharging it from the other opening (outlet).

[0038] The temperature at which a polymer undergoes thermal degradation varies depending on, for example, the type of polymer and the type of molded product, and therefore the set temperature of the confluence 35 can be appropriately set depending on, for example, the type of polymer and the type of molded product that uses the filtered polymer as a raw material.

[0039] The temperature at and near the confluence 35 can be measured, for example, by placing a temperature sensor in the polymer filter 1, or by using a thermograph or the like from outside the polymer filter 1. The conditions for introducing the solvent (for example, flow rate and flow rate) are not particularly limited, and for example, when using the polymer filter 1, a solvent that is about 5 to 20°C lower than the set temperature of the polymer filter 1 can be passed through the polymer filter 1, and the flow rate and / or flow rate of the solvent can be adjusted based on the difference between the temperature of the introduced solvent and the temperature of the extracted solvent.

[0040] In the temperature control flow path 40, one of the openings at both ends is an inlet and the other is an outlet. In FIG. 5(A) of this embodiment, the temperature control flow paths 40 (41, 42) are indicated by an arrow In on the inlet side and an arrow Out on the outlet side, but the opposite may also be true. In this embodiment, the openings at both ends of the temperature control flow paths 41, 42 are each located on the downstream end face 302e of the base 302 of the center post 30, as shown in FIG. 3(C), but this is not limiting. Regarding the openings at both ends of the temperature control flow path 40, for example, one may be located on the end face 302e of the base 302 and the other on the side face 302s of the base 302, or both may be located on the end face 302e or the side face 302s of the base 302.

[0041] 5, the present embodiment illustrates an embodiment having two temperature control flow paths 40 (41, 42), but there are no particular limitations on the number of temperature control flow paths 40. As long as the temperature of the junction 35 can be adjusted by passing a solvent through the temperature control flow path 40, the number of temperature control flow paths 40 may be, for example, one or two or more, and specific examples include 1 to 20, 1 to 12, 1 to 10, 1 to 8, 1 to 5, and 1 to 3.

[0042] (Embodiment 2) This embodiment shows another example of the temperature control flow path in the center post. Unless otherwise specified, the center post of this embodiment is the same as that of the first embodiment except for the temperature control flow path, and the description of the first embodiment can be used.

[0043] Figure 6 shows an outline of the temperature control flow passage 40 (41, 42) of the center post 30. Figure 6(A) is a perspective view showing the gap of the temperature control flow passage 40, and Figure 6(B) is a perspective view in which the gap of the temperature control flow passage 40 is further added to the configuration of Figure 4(A).

[0044] The center post 30 of this embodiment has two temperature control flow paths 40 (41, 42). Each temperature control flow path 40 is a flow path that runs from the downstream side of the junction 35, passes through an upstream region 37 of the junction 35, and returns to the downstream side. Each temperature control flow path 40 has a turn-back structure in the upstream region 37 that returns to the downstream side, and these are called turn-back portions 411 and 421.

[0045] The temperature control flow paths 41 and 42 intersect with each other when viewed from above, for example, and the two openings of the temperature control flow path 41 and the two openings of the temperature control flow path 42 are diagonally positioned. Specifically, one temperature control flow path 41 extends upstream from the outlet 33 side, passes between the junction flow paths 34a and 34b, the upstream region 37, and between the junction flow paths 34c and 34d, and returns downstream to the outlet 33 side. The other temperature control flow path 42 extends upstream from the outlet 33 side, passes between the junction flow paths 34d and 34a, the upstream region 37, and between the junction flow paths 34c and 34b, and returns downstream to the outlet 33 side. The turn-back portion 411 of the temperature control flow path 41 and the turn-back portion 421 of the temperature control flow path 42 are positioned at different positions in the vertical direction, and are not in communication with each other.

[0046] In the temperature control flow path 40, one of the openings at both ends is an inlet and the other is an outlet, and either may be an inlet. In this embodiment, the openings at both ends of the temperature control flow path 40 (41, 42) are each located on the downstream end face 302e of the base 302 of the center post 30, as in FIG. 3(C), but this is not limiting. For example, one of the openings at both ends of the temperature control flow path 40 (41, 42) may be located on the end face 302e of the base 302 and the other on the side face 302s of the base 302, or both may be located on the end face 302e or the side face 302s of the base 302.

[0047] (Embodiment 3) In this embodiment, the temperature control channel in the center post is branched. Unless otherwise specified, the center post of this embodiment is the same as that of the first embodiment except for the number of grooves and converging channels, and the temperature control channel, and the description of the first embodiment can be cited.

[0048] In this embodiment, a center post having three grooves is taken as an example. That is, the center post shown in FIG. 3(A) of the first embodiment has three grooves 31. FIG. 7 shows a perspective view of the center post 30, showing only the flow paths in region A of FIG. 3(A). Note that details of the temperature control flow paths in the center post 30 are omitted from FIG. 7 and will be described later using FIG. 8. As shown in FIG. 7, the center post 30 of this embodiment has three grooves 31 (31a, 31b, 31c) and three confluent flow paths 34 (34a, 34b, 34c) connected to them.

[0049] 8 shows an outline of the temperature adjustment path 43 of the center post 30. Fig. 8(A) is a perspective view showing the gap of the temperature adjustment flow path 43, and Fig. 8(B) is a perspective view in which the gap of the temperature adjustment flow path 43 is further added to the configuration of Fig. 7.

[0050] The center post 30 of this embodiment has a branched temperature control channel 43. The temperature control channel 43 has three hollow regions (43a, 43b, 43c), and the three hollow regions (43a, 43b, 43c) communicate with each other upstream of the confluence 35 at an end 432 on the confluence 35 side. The first hollow region 43a passes between the confluence channels 34a and 34b. The second hollow region 43b is a channel that communicates with the first hollow region 43a, passes through the upstream region 37 of the confluence 35, turns back downstream at the turning portion 431b, passes between the confluence channels 34b and 34c, and exits at the side surface 302s of the base 302 of the center post 30. The third hollow region 43c is a flow path that communicates with the first hollow region 43a, passes through the upstream region 37 of the confluence 35, turns back downstream at the turning portion 431c, passes between the confluence flow paths 34c and 34a, and exits at the side surface 302s of the base 302 of the center post 30.

[0051] In the temperature control flow path 43, the opening at the end of at least one of the three hollow regions is an inlet, and the opening at least one of the hollow regions is an outlet. Specifically, the openings at the end of each of two hollow regions may be inlets and the opening at the end of one hollow region may be an outlet, or the opening at the end of one hollow region may be an inlet and the openings at the end of each of two hollow regions may be an outlet. In the temperature control flow path 43 of this embodiment shown in FIG. 8(A), the openings at the ends of the second hollow region 43b and the third hollow region 43c are inlets (arrow In) and the opening at the end of the first hollow region 43a is an outlet (arrow Out), but this is not limiting. In other words, the opening of the second hollow region 43b or the opening of the third hollow region 43c may be an outlet, and the openings of the other two hollow regions may be inlets. Alternatively, the opening of any one hollow region may be an inlet, and the openings of the other two hollow regions may be outlets. In this embodiment, the first hollow region 43a preferably has a larger cross-sectional area than the other hollow regions 43b and 43c, for example, to allow the solvent introduced into the other hollow regions 43b and 43c to escape. The cross-sectional area of ​​the gap is, for example, the cross-sectional area in the direction perpendicular to the axial direction of the hollow region. Specifically, when the gap is cylindrical, the first hollow region 43a preferably has a larger diameter than the other hollow regions.

[0052] 8 of this embodiment, the end of first hollow region 43a is located on end face 302e of base 302 of center post 30, and the ends of second hollow region 43b and second hollow region 43c are each located on side face 302s of the base of center post 30. The positions of the openings at the ends of the three hollow regions (43a, 43b, 43c) are not particularly limited, and may be, for example, all on end face 302e of base 302, all on side face 302s, any one on end face 302e and the rest on side face 302s, or any one on side face 302s and the rest on end face 302e.

[0053] In this embodiment, an example is shown in which the branched temperature control flow path 43 has three hollow regions, but the number of branches (the number of hollow regions) is not limited. Examples of the number of hollow regions include 3 to 20, 3 to 12, and 3 to 6.

[0054] (Embodiment 4) In this embodiment, the temperature control flow path in the center post has a liquid reservoir. Unless otherwise specified, the center post of this embodiment is the same as that of the first embodiment except for the temperature control flow path, and the description of the first embodiment can be used.

[0055] (4-1) Fig. 9 is a schematic diagram showing only the temperature control flow path 44 in the center post 30, specifically a perspective view showing the gap of the temperature control flow path 44 in the center post 30. Fig. 10 is a perspective view in which the gap of the temperature control flow path 44 is further added to the configuration of Fig. 4(A).

[0056] The center post 30 of this embodiment has one temperature control flow path 44. The temperature control flow path 44 is a flow path that runs from the downstream side of the junction 35, passes through an upstream region 37 of the junction 35, and returns to the downstream side, and has a liquid reservoir 44R in the upstream region 37. The hollow region of the temperature control flow path 44 from one end to the liquid reservoir 44R is called a first hollow region 44a, and the hollow region from the other end to the liquid reservoir 44R is called a second hollow region 44b.

[0057] The temperature control flow path 44 is a flow path in which the first hollow region 44a extends upstream from the outlet 33 side, passes between the confluence flow paths 34a and 34b, passes through a liquid reservoir section 44R in the upstream region 37, and the second hollow region 44b passes between the confluence flow paths 34c and 34d, and returns toward the downstream side where the outlet 33 is located.

[0058] In this embodiment, the cavity of the liquid reservoir 44R is exemplified as having an inverted cone shape that tapers toward the tip. The shape of the cavity of the liquid reservoir 44R is not particularly limited, and may be any shape as long as it can store an arbitrary amount of solvent introduced from one hollow region and discharge it from the other hollow region. Examples of the shape of the cavity include a cone, a pyramid, an inverted pyramid, a sphere, and a polygon.

[0059] In this embodiment, the liquid reservoir 44R communicates with the hollow regions (44a, 44b) at the side surfaces. The location of communication between the liquid reservoir 44R and the hollow regions (44a, 44b) is not particularly limited, and may be, for example, the bottom or the side surfaces.

[0060] In this embodiment, the temperature control flow path 44 has a liquid reservoir 44R in the middle of a single flow path, but is not limited to this. For example, the temperature control flow path 44 may be a branched type in which three or more hollow regions are connected by a liquid reservoir, as exemplified in the following (4-2).

[0061] (4-2) This embodiment shows an example of a branched temperature control flow channel having the liquid reservoir. Fig. 11 is a schematic diagram showing only the temperature control flow channel 44 in the center post 30, specifically a perspective view showing the gap of the temperature control flow channel 44. Fig. 12 is a perspective view in which the gap of the temperature control flow channel 44 is further added to the configuration of Fig. 7 having three grooves in embodiment 3.

[0062] The center post 30 of this embodiment has a branched temperature control flow path 44. The temperature control flow path 44 has four hollow regions (44a, 44b, 44c, and 44d), and the four hollow regions (44a, 44b, and 44c) communicate with each other via a liquid reservoir 44R at an end 432 on the confluence 35 side upstream of the confluence 35. The first hollow region 44a and the second hollow region 44b pass between the confluence flow paths 34a and 34b and communicate with the liquid reservoir 44R. The first hollow region 44a and the second hollow region 44b are positioned above and below each other, and the first hollow region 44a communicates with a position below the second hollow region 44b, specifically, near the bottom of the liquid reservoir 44R. The third hollow region 44c passes between the merging channels 34b and 34c and communicates with the liquid reservoir 44R. The fourth hollow region 44d passes between the merging channels 34c and 34a and communicates with the liquid reservoir 44R.

[0063] The first hollow region 44a is a flow path that leads to an end face 302e of the base 302 of the center post 30, and the other hollow regions 44b, 44c, and 44d are each a flow path that leads to a side face 302s of the base 302 of the center post 30.

[0064] In the temperature control flow path 44, the openings at the ends of the three hollow regions 44b, 44c, and 44d are inlets (arrow In), and the opening at the end of one hollow region 44a is an outlet (arrow Out). Since hollow region 44a discharges the solvent introduced into the other hollow regions 44b, 44c, and 44d, it is preferable that the cross-sectional area of ​​the gap be set larger than that of the other hollow regions, and that hollow region 44a communicates with the liquid reservoir 44R in a downward direction than the other hollow regions. The cross-sectional area of ​​the gap is, for example, the cross-sectional area in the direction perpendicular to the axial direction. Furthermore, as a specific example, when the gap is cylindrical, it is preferable that the diameter of hollow region 44a be set larger than that of the other hollow regions.

[0065] According to the fourth embodiment, as described above, since the temperature adjustment flow path has the liquid reservoir portion, for example, a sufficient amount of solvent can be held in the liquid reservoir portion, and therefore the temperature near the confluence portion 35 can be efficiently adjusted.

[0066] (Embodiment 5) This embodiment shows an example in which the center post has multiple temperature control channels. Unless otherwise specified, the center post of this embodiment is the same as that of the first embodiment except for the temperature control channels, and the description of the first embodiment can be used.

[0067] (5-1) FIG. 13(A) is a schematic diagram showing only the temperature control flow channels 50 (51, 52, 53, 54) in the center post 30, specifically a perspective view showing the gaps of the temperature control flow channels 50 in the center post 30. FIG. 13(B) is a perspective view showing the configuration of FIG. 4(A) to which the gaps of the temperature control flow channels 50 have been added. FIG. 13(B) shows only one representative temperature control flow channel 51 out of the four temperature control flow channels 50. FIG. 13(C) is a plan view from the upstream side of the configuration of FIG. 4(C) to which the gaps of the four temperature control flow channels 50 have been added.

[0068] Each of the temperature adjustment channels 50 is a channel that extends from the downstream side of the confluence 35, reaches an upstream region 37 of the confluence 35, and then turns back to return to the downstream side.

[0069] The temperature control flow path 51 turns back between the junction flow path 34a and the junction flow path 34b, the temperature control flow path 52 turns back between the junction flow path 34b and the junction flow path 34c, the temperature control flow path 53 turns back between the junction flow path 34c and the junction flow path 34d, and the temperature control flow path 54 turns back between the junction flow path 34d and the junction flow path 34a, and these flow paths are non-communicative and non-intersecting with each other.

[0070] In each temperature control flow channel 50, one of the openings at both ends is an inlet and the other is an outlet, and either may be the inlet. In this embodiment, the openings at both ends of the temperature control flow channel 50 (51, 52, 53, 54) are located on the downstream end face 302e of the base 302 of the center post 30, as in FIG. 3(C), but this is not limiting. Regarding the openings at both ends of the temperature control flow channel 50, for example, one may be located on the end face 302e of the base 302 and the other on the side face 302s of the base 302, or both may be located on the end face 302e or the side face 302s of the base 302.

[0071] (5-2) FIG. 14(A) is a schematic diagram showing only the temperature control flow channels 60 (61, 62, 63, 64) in the center post 30, specifically a perspective view showing the gaps of the temperature control flow channels 60 in the center post 30. FIG. 14(B) is a perspective view showing the configuration of FIG. 4(A) with the gaps of the temperature control flow channels 60 added. FIG. 14(B) shows only one representative temperature control flow channel 61 out of the four temperature control flow channels 60. FIG. 14(C) is a plan view from the upstream side showing the configuration of FIG. 4(C) with the gaps of the four temperature control flow channels 60 added.

[0072] Each of the temperature control channels 60 is a channel that runs from the downstream side of the junction 35, passes through the upstream region 37 of the junction 35, and returns to the downstream side. Each of the temperature control channels 60 (61, 62, 63, 64) has a liquid reservoir 60R (61R, 62R, 63R, 64R) in the upstream region 37. The shape of the liquid reservoir 60R is not particularly limited, and may be, for example, a rectangular parallelepiped cavity as exemplified in FIG. 14 or a conical cavity as exemplified in the fourth embodiment.

[0073] The temperature control flow path 61 passes between the junction flow path 34b and the junction flow path 34a, and between the junction flow path 34a and the junction flow path 34d, the temperature control flow path 62 passes between the junction flow path 34a and the junction flow path 34b, and between the junction flow path 34b and the junction flow path 34c, the temperature control flow path 63 passes between the junction flow path 34b and the junction flow path 34c, and between the junction flow path 34c and the junction flow path 34d, and the temperature control flow path 64 passes between the junction flow path 34c and the junction flow path 34d, and between the junction flow path 34d and the junction flow path 34a, and these flow paths are non-communicative and non-intersecting.

[0074] In each temperature control flow channel 60, one of the openings at both ends is an inlet and the other is an outlet, and either may be the inlet. In this embodiment, the openings at both ends of the temperature control flow channel 60 (61, 62, 63, 64) are located on the downstream end face 302e of the base 302 of the center post 30, as in FIG. 3(C), but this is not limiting. Regarding the openings at both ends of the temperature control flow channel 60, for example, one may be located on the end face 302e of the base 302 and the other on the side face 302s of the base 302, or both may be located on the end face 302e or the side face 302s of the base 302.

[0075] (5-3) FIG. 15(A) is a schematic diagram showing only the temperature control flow channels 70 (71, 72, 73, 74) in the center post 30, specifically a perspective view showing the gaps of the temperature control flow channels 70 in the center post 30. FIG. 15(B) is a perspective view showing the configuration of FIG. 4(A) to which the gaps of the temperature control flow channels 70 have been added. FIG. 15(B) shows only one representative temperature control flow channel 71 out of the four temperature control flow channels 70. FIG. 15(C) is a plan view from the upstream side showing the configuration of FIG. 4(C) to which the gaps of the four temperature control flow channels 70 have been added.

[0076] The temperature control channels 70 are channels that extend from the downstream side of the confluence 35 to the upstream region 37 of the confluence 35, then turn around and return to the downstream side. Each of the temperature control channels 70 (71, 72, 73, 74) has a liquid reservoir 70R (71R, 72R, 73R, 74R) in the upstream region 37. In this embodiment, the temperature control channels 70 are arranged in the upstream region 37 so as to surround the outer circumferential surfaces of the confluence channels 34 (34a, 34b, 34c, 34d). The shape of the liquid reservoir 70R is not particularly limited, and can be, for example, a rectangular parallelepiped space as shown in FIG. 15.

[0077] In the upstream region 37, the temperature control flow path 71 surrounds the converging flow path 34a, the temperature control flow path 72 surrounds the converging flow path 34b, the temperature control flow path 73 surrounds the converging flow path 34c, and the temperature control flow path 74 surrounds the converging flow path 34d, and these flow paths are non-communicating and non-intersecting with each other.

[0078] In each temperature control flow channel 70, one of the openings at both ends is an inlet and the other is an outlet, and either may be the inlet. In this embodiment, the openings at both ends of the temperature control flow channel 70 (71, 72, 73, 74) are each located on the downstream end face 302e of the base 302 of the center post 30, as in FIG. 3(C), but this is not limiting. Regarding the openings at both ends of the temperature control flow channel 70, for example, one may be located on the end face 302e of the base 302 and the other on the side face 302s of the base 302, or both may be located on the end face 302e or the side face 302s of the base 302.

[0079] The type of polymer to be treated with the polymer filter of the present invention is not particularly limited, and any polymer that can be used as a raw material for polymer molding can be used. Examples of such polymers include PP, PE, EVA, PMMA, PS, PC, PET, PA, COP, COC, PBT, PEN, LCP, and PEEK.

[0080] As described above, the polymer filter of the present invention can reduce the influence of heat on the polymer at the confluence portion communicating with the plurality of confluence channels, thereby preventing, for example, gelation, burning, discoloration, streaks, and the like that occur in a polymer molded product due to thermal degradation of the polymer before molding.

[0081] [Polymer filter center post] As described above, the center post for a polymer filter of the present invention has the following features: The outer peripheral surface has a plurality of grooves extending in the axial direction on the upstream side in the axial direction, a hollow outlet flow path extending in the axial direction is provided inside the downstream side in the axial direction, a plurality of confluent flow paths extending from the downstream ends of the plurality of grooves toward the upstream end of the outlet flow path; a confluence portion is a region where an upstream end of the outlet flow path communicates with downstream ends of the plurality of confluence flow paths, Further, a hollow temperature control flow path through which the solvent passes is provided near the confluence, the temperature adjustment flow path is not in communication with the outlet flow path and the merging flow path; It is characterized in that it is used in the polymer filter of the present invention.

[0082] The center post for the polymer filter of the present invention can be made use of the same description of the center post as described above for the polymer filter of the present invention.

[0083] [Method of manufacturing polymer molded body] The method for producing a polymer molded article of the present invention comprises the steps of: filtering a molten polymer using the polymer filter of the present invention; and The method is characterized by including a step of molding the molten polymer after filtration.

[0084] The manufacturing method of the present invention is characterized by filtering a molten polymer using the polymer filter equipped with the center post of the present invention and using the molten polymer after filtration as a raw material for molding, and other steps and conditions are not particularly limited. The manufacturing method of the present invention can be applied to the above-mentioned polymer filter of the present invention. The polymer molded article is also called, for example, a polymer processed product.

[0085] Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above-described embodiments. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. [Industrial Applicability]

[0086] The polymer filter of the present invention can reduce the thermal effect on the polymer when it passes through the center post, thereby reducing, for example, thermal degradation of the polymer after filtration, which can lead to prevention of deterioration in the quality of the polymer molded product.

Claims

1. Includes a container body, a disc-shaped filter, and a center post; The container body is a polymer inlet, an inlet flow path communicating with the inlet, and a storage space communicating with the inlet flow path; The disk-shaped filter and the center post are accommodated in the accommodation space; The disk-type filter is having a central through hole; The container is accommodated in the accommodation space of the container body with the center post inserted into the through hole; The center post is The outer peripheral surface of the disk-type filter, facing the upstream side in the axial direction, has a plurality of grooves along the axial direction, a hollow outlet flow path extending in the axial direction is provided inside the downstream side in the axial direction, a plurality of confluent flow paths extending from the downstream ends of the plurality of grooves toward the upstream end of the outlet flow path; a confluence portion is a region where an upstream end of the outlet flow path communicates with downstream ends of the plurality of confluence flow paths, an opening at a downstream end of the outlet flow path is an outlet for the polymer; The center post is Further, a hollow temperature control flow path through which the solvent passes is provided near the confluence, The temperature adjustment flow path is not in communication with the outlet flow path and the junction flow path. A polymer filter characterized by:

2. The polymer filter according to claim 1 , wherein the temperature adjustment flow path is a flow path that runs from a downstream side of the confluence, passes through an upstream side of the confluence, and returns to the downstream side.

3. The polymer filter according to claim 1 or 2, wherein the temperature adjustment flow path is a flow path that passes from the downstream side of the confluence between adjacent confluence flow paths, passes through the upstream side of the confluence, and returns to the downstream side.

4. 4. The polymer filter according to claim 1, wherein the temperature adjustment flow path is a flow path that passes from the downstream side of the confluence between a pair of adjacent confluence flow paths, passes through the upstream side of the confluence, passes through another pair of adjacent confluence flow paths, and returns to the downstream side.

5. The polymer filter according to claim 1 , wherein the temperature control flow path is two or more.

6. The polymer filter according to claim 1 , wherein two or more of the temperature adjustment flow paths intersect with each other upstream of the joining portion.

7. The temperature adjustment flow path is a branched flow path including a plurality of hollow regions, The polymer filter according to claim 1 , wherein the plurality of hollow regions communicate with each other at ends on the confluence side, upstream of the confluence.

8. The center post is Furthermore, a space is provided as a liquid reservoir on the upstream side of the confluence, The polymer filter according to claim 1 , wherein the temperature adjustment flow path communicates with the liquid reservoir.

9. The polymer filter according to any one of claims 1 to 8, wherein the number of the grooves is 2 to 20.

10. The outer peripheral surface has a plurality of grooves extending in the axial direction on the upstream side in the axial direction, a hollow outlet flow path extending in the axial direction is provided inside the downstream side in the axial direction, a plurality of confluent flow paths extending from the downstream ends of the plurality of grooves toward the upstream end of the outlet flow path; a confluence portion is a region where an upstream end of the outlet flow path communicates with downstream ends of the plurality of confluence flow paths, Further, a hollow temperature control flow path through which the solvent passes is provided near the confluence, the temperature adjustment flow path is not in communication with the outlet flow path and the merging flow path; Use for the polymer filter according to any one of claims 1 to 9 A center post for a polymer filter.

11. filtering a molten polymer with the polymer filter of any one of claims 1 to 9; and and forming the molten polymer after filtration. A method for producing a polymer molded article, comprising:

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