JP2019051459A - Hollow fiber membrane module and method of manufacturing hollow fiber membrane module - Google Patents

Abstract

To restrain insufficient sealing or cracks in a sealing member and to restrain remaining of liquid in a seal area when sealing is done by a header and the sealing member.SOLUTION: On an opposed surface 40 of headers 14A and 14B that faces a sealing member 18, a cylindrical projection 26 capable of abutting on an outer peripheral side of an exposed surface 24B where a hollow fiber membrane bundle 16 in an exposed surface 24 of the sealing member 18 that faces the headers 14A and 14B is not distributed is provided. The cylindrical projection 26 is formed in a cross-section of an angle shape widened from the tip top. The cylindrical projection 26 is formed so that an inner diameter side slope 26A of the cross-sectional angle shape opens relative to a radial line R of a column 12 as compared with an outer diameter-side slope 26B.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hollow fiber membrane module and a method for producing the same.

  Conventionally, hollow fiber membrane modules have been used for purposes such as water purification and hemodialysis. In the hollow fiber membrane module, a hollow fiber membrane bundle is accommodated in a cylindrical case called a column. Both ends of the hollow fiber membrane bundle are fixed by a sealing member that is fixed to the inner circumferential surface of the column. Further, lid members called headers are attached to both ends of the column.

  The hollow fiber membrane bundle is fixed to the sealing member while being brought close to the central axis side of the column. The outer edge side of the sealing member where the hollow fiber membrane is not distributed is used as a sealing region for preventing leakage of the processing liquid. For example, an O-ring is arranged on the outer edge side of the sealing member, and the O-ring is sandwiched between the header and the sealing member, thereby preventing liquid leakage to the outer diameter side.

  Further, for example, in Patent Documents 1 to 4, the header directly contacts the sealing member without an O-ring, thereby preventing liquid leakage from the contact portion to the outer diameter side. For example, a cylindrical protrusion (cylindrical protrusion) is provided on the inner surface of the header, that is, the surface facing the column opening. The tip of the cylindrical protrusion is brought into contact with the sealing member to prevent liquid leakage from the contact portion to the outer diameter side.

JP 2008-93518 A Japanese Patent No. 4369840 No. 6-30202 JP2013-6018A

  By the way, in order to ensure a stable sealing performance without using an O-ring, it is preferable to bite the tip of the cylindrical protrusion into the sealing member. At this time, for example, as shown in FIG. 10, when the tip section of the cylindrical protrusion 100 is rectangular, a larger pressure is required to bite into the sealing member 102 than when the tip has a tip shape. As a result, stress may concentrate on the corners of the rectangular shape and the sealing member 102 may crack.

  Further, when the header 104 directly contacts the sealing member 102, the header 104 is close to the sealing member, particularly in the contact region. As a result, it is difficult for the liquid to flow in the same region, which may lead to retention.

  Accordingly, the present invention provides a hollow fiber membrane module capable of suppressing insufficient sealing and cracking of the sealing member and suppressing liquid retention in the sealing region when sealing is performed with the header and the sealing member. The purpose is to do.

  The present invention relates to a hollow fiber membrane module. The module includes a column, a hollow fiber membrane bundle, a sealing member, and a header. The column is configured in a cylindrical shape. The hollow fiber membrane bundle is accommodated in the column. The sealing member is filled between the hollow fiber membranes at both ends of the hollow fiber membrane bundle in a state where the hollow fiber membrane bundle is brought close to the central axis side of the column and is fixed to the inner peripheral surface of the column. Headers are attached to both ends of the column. On the surface of the header that faces the sealing member, a cylindrical protrusion that can contact the outer peripheral side of the exposed surface of the sealing member where the hollow fiber membrane bundle is not distributed is provided. The cylindrical protrusion is formed in a mountain shape in cross section that is widened from the apex of the tip. Cylindrical protrusions are formed so that the inner diameter side slope of the mountain cross section is open with respect to the radial line of the column as compared to the outer diameter side slope.

  In the above invention, the opening angle that is the angle formed by the inner diameter side slope and the outer diameter side slope of the mountain-shaped cross section may be an obtuse angle.

  Moreover, in the said invention, the crossing angle | corner opening angle may be 120 to 145 degrees.

  Moreover, in the said invention, the opening angle of a cross-sectional mountain shape may be 139 degrees.

  Moreover, in the said invention, the curved surface process may be given to the skirt side of the internal diameter side slope of a cross-sectional mountain shape.

  In the above invention, the top vertex of the cylindrical protrusion may be an R plane.

  The present invention also relates to a method for producing a hollow fiber membrane module. The hollow fiber membrane module includes a cylindrical column, a hollow fiber membrane bundle accommodated in the column, and a hollow fiber membrane bundle hollowed at both ends of the hollow fiber membrane bundle in a state where the hollow fiber membrane bundle is brought close to the central axis side of the column. A sealing member that is filled between the thread membranes and is fixed to the inner peripheral surface of the column; and headers that are attached to both ends of the column. On the surface of the header that faces the sealing member, a cylindrical protrusion that can contact the outer peripheral side of the exposed surface of the sealing member where the hollow fiber membrane bundle is not distributed is provided. The cylindrical projection is formed in a cross-sectional mountain shape that is widened from the apex of the tip, and the cylindrical projection is formed so that the inner diameter side slope of the cross-section mountain shape is open with respect to the radial line of the column as compared with the outer diameter side slope. In manufacturing the hollow fiber membrane module, when attaching the header to the column, the cylindrical protrusion is bitten into the sealing member that has been heated and softened.

  According to the present invention, the cylindrical protrusion of the header is formed into a cross-sectional mountain shape that is widened from the apex of the tip, so that it is possible to easily bite into the sealing member at a lower pressure than in the case of a rectangular cross-section. In addition, it becomes possible to suppress insufficient sealing and cracking of the sealing member. Furthermore, by forming the inner diameter side slope of the mountain-shaped cross section of the cylindrical protrusion so as to open with respect to the radial line of the column as compared with the outer diameter side slope, it is possible to suppress the retention of the liquid in the seal region.

It is side surface sectional drawing which illustrates the hollow fiber membrane module which concerns on this embodiment. It is a figure which illustrates the expanded cross section of the column edge part of the hollow fiber membrane module which concerns on this embodiment. It is a figure explaining the shape of the header of the hollow fiber membrane module which concerns on this embodiment. It is a graph which shows the relationship between welding energy and the penetration depth to a sealing member according to protrusion shape. It is a graph which shows the relationship between the maximum pressurization value and the penetration depth to a sealing member according to protrusion shape. It is a graph which shows the relationship between welding energy and the penetration depth to a sealing member according to a taper angle. It is a graph which shows the relationship between the maximum pressurization value and the penetration depth to a sealing member according to a taper angle. It is a figure explaining the shape of the header of the hollow fiber membrane module which concerns on another example of this embodiment. It is a figure which illustrates the expanded cross section of the column edge part of the hollow fiber membrane module which concerns on another example of this embodiment. It is a figure which illustrates the expanded cross section of the column edge part of the hollow fiber membrane module which concerns on a prior art. It is a figure explaining the shape of the comparative example manufactured in order to obtain | require the relationship between welding energy and the penetration depth to a sealing member, and the relationship between the maximum pressurization value and the penetration depth to a sealing member.

  In FIG. 1, side surface sectional drawing of the hollow fiber membrane module 10 which concerns on this embodiment is illustrated. The hollow fiber membrane module 10 includes a column 12, headers 14A and 14B, a hollow fiber membrane bundle 16, and a sealing member 18. The hollow fiber membrane module 10 is used, for example, as a filtration device that removes fine particles of raw water. The hollow fiber membrane module 10 is also used as a so-called dialyzer for hemodialysis.

  In addition, although the example which uses the hollow fiber membrane module 10 as a dialyzer is given in the following description, it is not restricted to this form.

  The column 12 is a cylinder that accommodates the hollow fiber membrane bundle 16. The column 12 is formed from a cylinder made of a resin material such as polycarbonate. The column 12 is formed with a dialysate introduction port 20 and a dialysate lead-out port 22 so as to protrude from the cylinder in the radial direction near both ends in the longitudinal direction. A dialysate is supplied into the column 12 from the outside via the dialysate introduction port 20. In addition, dialysate (substance exchanged) is led out from the column 12 through the dialysate lead-out port 22.

  The hollow fiber membrane bundle 16 is accommodated in the column 12 and both ends thereof are fixed by a sealing member 18. Further, both ends of each hollow fiber membrane constituting the hollow fiber membrane bundle 16 are open (not filled with the sealing member 18), and blood is directed from one end opening of the hollow fiber membrane toward the other end opening. Flows.

  The hollow fiber membrane is composed of, for example, a thin tube having a circular cross-section with a membrane substrate thickness of 5 to 150 μm and an inner diameter of about 100 to 500 μm. Among the above ranges, it is more preferable that the film substrate has a thickness of 30 to 50 μm and an inner diameter of about 200 to 250 μm. Moreover, the membrane substrate of the hollow fiber membrane is composed of a semipermeable membrane made of a hydrophobic polymer using, for example, a polyester-based resin and a polysulfone-based resin as main membrane substrates. Here, the polyester resin may be, for example, a polyarylate resin having a repeating unit represented by the following formula (1).

In the chemical formula (1), R ¹ and R ² are lower alkyl groups having 1 to 5 carbon atoms, which may be the same or different.

  Moreover, the polysulfone resin described above may be, for example, a polysulfone resin having at least one of a repeating unit represented by the following formula (2) and a repeating unit represented by the following formula (3).

In the chemical formula (2), R ³ and R ⁴ are lower alkyl groups having 1 to 5 carbon atoms, which may be the same or different.

  The film-forming stock solution for spinning these hydrophobic membrane base materials determines the mixing weight ratio (A / B) of the polyester-based resin (A) and the polysulfone-based resin (B) in the range of 0.1 to 10. At the same time, it is prepared by dissolving in an organic solvent such that the total amount (A + B) of both resins is 10 wt% to 25 wt%.

  Further, the hollow fiber membrane has been described with respect to the case where it is composed of a semi-permeable membrane made of a hydrophobic polymer having a polyester-based resin and a polysulfone-based resin as the main membrane base material. Alternatively, the membrane substrate may be formed of a single polysulfone resin.

  The sealing member 18 is also called a potting material, and is made of a thermosetting resin such as polyurethane, phenol resin, or epoxy resin. When the headers 14 </ b> A and 14 </ b> B are attached to the column 12, the sealing member 18 may be heated and softened in order to make the cylindrical protrusion 26 easily bite into the sealing member 18. For example, the sealing member 18 having a rubber hardness of about 95 before heating is set to less than 87 by heating, and the headers 14A and 14B are attached to the column 12. The rubber hardness is measured by a method defined in, for example, JIS K 6253.

  The sealing member 18 seals the opening at both ends of the column 12 in a state where the end opening of the hollow fiber membrane bundle 16 is opened. The sealing member 18 is filled so as to fill the gaps between the individual hollow fiber membranes of the hollow fiber membrane bundle 16. Further, the sealing member 18 is fixed to the inner peripheral surface in the vicinity of the opening at both ends of the column 12 to prevent the dialysate in the column 12 from leaking out from the opening at both ends of the column 12.

  The sealing member 18 also has a function as a fixing means for fixing both ends of the hollow fiber membrane bundle 16 to the column 12. In this fixing, the sealing member 18 fixes the hollow fiber membrane bundle 16 in a state where the hollow fiber membrane bundle 16 is brought close to the central axis C side of the column 12. For example, the hollow fiber membrane bundle 16 is fixed in a state in which the sealing member 18 and the headers 14 </ b> A and 14 </ b> B are closer to the central axis than the sealing region. The seal region refers to a region where the tip of the cylindrical protrusion 26 of the headers 14A and 14B bites into the sealing member 18.

  FIG. 2 illustrates an enlarged end sectional view of the column 12. In addition, although the enlarged view by the side of the header 14A is illustrated here, the header 14B is also provided with the same structure. As described above, since the hollow fiber membrane bundle 16 is moved closer to the central axis C side of the column 12 (closer to the central axis side than the sealing region constituted by the sealing member 18 and the headers 14A and 14B), sealing is performed. The stop member 18 is divided into an inner peripheral region 18A in which the hollow fiber membrane bundle 16 is distributed and an outer peripheral region 18B in which the hollow fiber membrane bundle 16 is not distributed.

  Of the exposed surface 24 of the sealing member 18 facing the header 14A, from the surface on the inner peripheral region 18A side (exposed surface inner peripheral side 24A), the material-exchanged blood is passed from the hollow fiber membrane bundle 16. Derived.

  Further, the outer peripheral side region 18 </ b> B of the sealing member 18 functions as a seal region for preventing leakage of the processing liquid (blood) to the outer diameter side of the column 12. That is, of the exposed surface 24 of the sealing member 18 facing the header 14A, the surface on the outer peripheral side region 18B side (exposed surface outer peripheral side 24B) is in contact with the cylindrical protrusion 26 of the header 14A, and the tip thereof is the inside. Configured to bite into. Thereby, the leakage of the liquid from the said contact location to the outer diameter side is prevented.

  The headers 14A and 14B are liquid passing means for introducing blood from the outside and leading the blood to the outside. The headers 14A and 14B are attached so as to cover both end openings of the column 12. That is, the headers 14 </ b> A and 14 </ b> B include a lid portion 28 that faces the end portion of the column 12, and a side peripheral wall 30 that is provided on the outer periphery of the lid portion 28 and has an inner diameter larger than the outer peripheral diameter of the end portion of the column 12. As will be described later, headers 14A and 14B are attached to both ends of the column 12, and ultrasonic welding is performed around the side peripheral wall 30, so that a part of the outer peripheral wall of the column 12 and a part of the side peripheral wall 30 are welded. 32 is formed (see FIG. 2). As a result, the headers 14 </ b> A and 14 </ b> B are fixed to the column 12. Note that the side peripheral wall 30 and the end portions of the column 12 in the longitudinal direction (column central axis C direction) may be brought into contact with each other and welded together.

  A port (opening) 34 is provided at the center of the lid portion 28 of the headers 14A and 14B. The port 34 includes an outer cylindrical portion 36, and a screw thread 38 is formed on the inner peripheral surface thereof. During hemodialysis, the thread formed on the outer peripheral surface of a joint (not shown) provided at the distal end of the tube for blood removal from the patient or returning to the patient and the thread 38 of the port 34 are screwed. Together they are combined.

  Further, a cylindrical projection 26 that protrudes toward the sealing member 18 is formed on the facing surface 40 of the lid 14 of the headers 14A and 14B with the sealing member 18. The cylindrical protrusion 26 is provided at a position facing the exposed surface outer peripheral side 24B of the sealing member 18 when the headers 14A and 14B are attached to the column 12. As will be described later, in the welding step for fixing the headers 14A and 14B to the column 12, the headers 14A and 14B are inserted into (inserted into) the column 12. In this process, the cylindrical protrusion 26 contacts the exposed surface outer peripheral side 24 </ b> B of the sealing member 18. When the pressure is further applied to insert the headers 14 </ b> A and 14 </ b> B, the tip of the cylindrical protrusion 26 bites into the sealing member 18. As a result, the leakage of blood from the contact location to the outer diameter side is prevented.

  As illustrated in FIG. 2, the cylindrical protrusion 26 is formed in a cross-sectional mountain shape that is widened from the apex of the tip toward the facing surface 40. By setting the cross section to be a chevron, the tip of the cylindrical protrusion 26 can be bitten into the sealing member 18 at a lower pressure than the rectangular cross section. In addition, since the contact surface between the sealing member 18 and the cylindrical protrusion 26 is expanded during the biting process, the pressing force is reduced. The top vertex of the cylindrical protrusion 26 can be the R plane. For example, R may be 0.2 [mm]. By setting the leading apex as the R plane, the stress generated in the sealing member 18 during biting is dispersed, and cracking of the sealing member 18 can be suppressed.

  Here, referring to FIG. 3, the opening angle γ of the cylindrical protrusion 26, that is, the angle formed between the inner diameter side slope 26 </ b> A and the outer diameter side slope 26 </ b> B may be an obtuse angle. For example, if it is an acute angle, the cylindrical protrusion 26 becomes thin and may break during the process of biting into the sealing member 18, but if it is an obtuse angle, the risk of such a breakage is reduced. Further, the obtuse angle improves the followability of the contact surface of the sealing member 18 having elasticity with the cylindrical protrusion 26, in other words, the sealing member 18 is easily deformed along the shape of the cylindrical protrusion 26. Sealability is improved.

  For example, the opening angle γ of the cylindrical protrusion 26 may be not less than 120 ° and not more than 145 °. More preferably, as will be described later with reference to FIGS. 6 and 7, the opening angle γ may be 139 °.

  Further, the cylindrical protrusion 26 according to the present embodiment is formed such that the inner diameter side slope 26 </ b> A having a mountain-shaped cross section is opened with respect to the radial line R of the column 12 as compared with the outer diameter side slope 26 </ b> B. By opening the inner diameter side slope 26A, the space between the outer peripheral side 24B of the exposed surface and the inner diameter side slope 26A is opened, and the flow of the liquid (blood) flowing through the region is ensured.

  For example, as illustrated in FIG. 3, the angle β formed by the inner diameter side slope 26A and the radial line R of the column 12 is 30 °, and the angle α formed by the outer diameter side slope 26B and the radial line R is 11 °. As described above, the cylindrical protrusion 26 itself has a substantially isosceles triangular cross section, but its central line (indicated by a broken line) is inclined with respect to the column central axis C, so that the angle β of the inner diameter side slope 26A is changed to the outer diameter side. It is comprised so that it may open rather than the angle (alpha) of the slope 26B.

  4 and 5 show a comparative example of the hollow fiber membrane module 10 according to the present embodiment, that is, the cylindrical protrusion 26 having a mountain-shaped cross section, and the conventional hollow fiber membrane module having a rectangular section. Has been. 4, the horizontal axis represents welding energy [J], and the vertical axis represents the depth of penetration [mm] of the protrusion into the sealing member 18. The welding energy refers to energy for melting the inner peripheral surface of the side peripheral wall 30 of the headers 14 </ b> A and 14 </ b> B and the outer peripheral surface of the column 12. In general, the higher the welding energy, the easier the melting surface melts, and the pressure when the headers 14A and 14B are inserted into the column 12 is applied to the contact surface between the cylindrical projection 26 and the sealing member 18 more. Become. Therefore, qualitatively, under the same pressure, the higher the welding energy, the deeper the biting depth.

  In FIG. 4, the cylindrical protrusion according to the present embodiment is indicated by a marker “taper 101 °”. As shown in FIG. 3, the angle with 101 ° indicates an angle ε (α + 90 °) of the outer diameter side slope 26 </ b> B with respect to the central axis C of the column 12. Moreover, the marker shown as "flat *. * Mm" in FIG. 4, FIG. 5 shows the comparative example in which the prior art was reflected. The comparative example has a rectangular projection, and as the cross-sectional shape, the contact surface length with the sealing member 18 is 0.5 mm, 1 mm, 1.5 mm, and 2 mm as shown in FIG. Yes.

  4 and 5, the acceptable value of the depth of penetration of the protrusion into the sealing member 18 was set to a value exceeding 0.1 mm, and the depth of penetration of 0.1 mm or less was rejected. The inventors of the present invention conducted an experiment in setting the acceptance value of the bite depth, and when the bite depth exceeded 0.1 mm, the contact point between the protrusion and the sealing member 18 changed the outer diameter side. No liquid leakage was confirmed. From this, the pass line of the above penetration depth is set.

  As for FIG. 4, the cylindrical protrusion 26 (taper 101 °) according to the present embodiment obtains an acceptable value in the penetration depth at any welding energy except for the case where a crack shown in Table 1 described later occurs. It is understood that

  FIG. 5 is a graph when the horizontal axis is the maximum pressure value. The vertical axis indicates the depth of penetration of the protrusion into the sealing member 18 as in FIG. As shown in this example, the cylindrical protrusion 26 (taper 101 °) having a mountain-shaped cross section according to this embodiment is compared with a conventional rectangular protrusion except for a case where a crack in Table 1 described later occurs. It will be understood that it is possible to cut into acceptable values at low pressure values.

  The data used as the basis of the graphs of FIGS. 4 and 5 are shown in Table 1 below. In addition, the cell in which the numerical value is not described in the biting amount shows an example in which the biting amount is unknown due to the occurrence of a crack. In the graphs of FIG. 4 and FIG. 5, plots are omitted for the following tables where the amount of biting was unknown.

In Table 1 and Table 2 described later, the welding energy and the maximum pressurization value are not set values but actually output values. For example, in the process of inserting the headers 14A and 14B into the column 12, the peak power [W] and the fusion distance are set for the welder. At this time, the welding horn is moved while oscillating until the output (welding power) of the welding horn reaches the peak power or reaches the set distance. Table 1 shows the maximum welding energy and the maximum pressure value obtained in this process. In addition, the amount of biting is the hollow fiber membrane module 10 after welding.
Was measured by breaking (developing).

  As shown in the above table, the cylindrical projection 26 having a mountain-shaped cross section according to the present embodiment has a seal deficiency (bite depth of 0.1 mm or less) and a seal as compared to the projection (rectangular projection) according to the prior art. It will be understood that the crack rate of the stop member 18 is low. Further, the ease of biting, that is, the value of “biting amount / maximum pressurization value” is a cylindrical protrusion having a cross-sectional mountain shape according to the present embodiment as compared with the comparative example reflecting the prior art, except for the data in which cracks occurred. 26 is larger. In other words, the cylindrical protrusion 26 having a mountain-shaped cross section according to the present embodiment can increase the amount of biting with a smaller pressure than the conventional one.

  Next, FIG. 6 and FIG. 7 show test results when various changes are made to the shape of the cylindrical protrusion 26 having a mountain-shaped cross section according to the present embodiment. The horizontal axis of FIG. 6 shows the welding energy [J], and the horizontal axis of FIG. 7 shows the maximum pressurization value [N]. The vertical axis represents the biting depth [mm].

  In this example, referring to FIG. 3, examples in which the opening angle γ of the cylindrical protrusion 26 is 120 °, 130 °, 139 °, and 145 ° are shown. The legend on the left side of the figure shows the angle ε formed by the central axis C of the column 12 and the outer diameter side slope 26B. That is, ε = 95 ° (■) corresponds to γ = 145 °, ε = 101 ° (♦) corresponds to γ = 139 °, ε = 110 ° (▲) corresponds to γ = 130 °, ε = 120 ° (●) corresponds to γ = 120 °. In any of these examples, the relationship of α <β in FIG. 3 is maintained.

  6 and 7, white plots (△, Δ, □, etc.) show examples in which the sealing member 18 is cracked. In any of the examples, although a crack is generated, it is understood that the penetration depth is obtained except for one example. The data used as the basis of FIG. 6 and FIG.

  In Table 2 above, especially for ε = 101 ° (γ = 139 °), the relationship between the pressure value and the amount of biting is almost directly proportional, and the adjustment of the amount of biting is compared with other examples. And has become easier. From such ease of processing, it is preferable that the opening angle γ of the cylindrical protrusion 26 is 139 °.

<Another example of this embodiment>
8 and 9 illustrate another example of the hollow fiber membrane module 10 according to the present embodiment. In this example, curved surface processing is applied to the skirt side of the inner diameter side slope 26A having a mountain-shaped cross section. If the straight lines cross each other, a so-called smear portion is formed, which may cause liquid retention. However, by applying curved surface processing to the portion, the liquid (blood) can be circulated smoothly.

  8 and 9, the angle β formed by the inner diameter side slope 26A and the radial line R of the column 12 is also greater than the angle α formed by the outer diameter side slope 26B and the radial line R. It is formed to be large. The angle γ formed by the inner diameter side slope 26A and the outer diameter side slope 26B is formed to be an obtuse angle.

10 hollow fiber membrane module, 12 columns, 14A, 14B header, 16 hollow fiber membrane bundle, 18 sealing member, 18A inner peripheral side region of sealing member, 18B outer peripheral side region of sealing member, 24B outer peripheral side of exposed surface, 26 cylindrical protrusion, 26A inner diameter side slope, 26B outer diameter side slope.

Claims (7)

A cylindrical column;
A hollow fiber membrane bundle accommodated in the column;
A sealing member that is filled between the hollow fiber membranes at both ends of the hollow fiber membrane bundle and is fixed to the inner peripheral surface of the column in a state where the hollow fiber membrane bundle is brought close to the central axis side of the column; ,
Headers attached to both ends of the column;
With
A cylindrical protrusion that can contact the outer peripheral side of the exposed surface of the sealing member, where the hollow fiber membrane bundle is not distributed, of the exposed surface of the sealing member that faces the header, on the surface of the header that faces the sealing member Is provided,
The cylindrical protrusion is formed in a cross-sectional mountain shape widened from the tip apex,
The hollow fiber membrane module in which the cylindrical protrusion is formed so that the inner diameter side slope of the mountain-shaped cross section is opened with respect to the radial line of the column as compared with the outer diameter side slope. The hollow fiber membrane module according to claim 1,
A hollow fiber membrane module in which the opening angle, which is an angle formed by the inner diameter side slope and the outer diameter side slope, of the mountain-shaped cross section is an obtuse angle. The hollow fiber membrane module according to claim 2,
The hollow fiber membrane module, wherein the opening angle of the mountain-shaped cross section is 120 ° or more and 145 ° or less. The hollow fiber membrane module according to claim 3,
The hollow fiber membrane module, wherein the opening angle of the cross-sectional chevron is 139 °. The hollow fiber membrane module according to any one of claims 1 to 4,
A hollow fiber membrane module in which a curved surface process is applied to a skirt side of the inner diameter side slope of the mountain-shaped cross section. A hollow fiber membrane module according to any one of claims 1 to 5,
A hollow fiber membrane module, wherein a top vertex of the cylindrical protrusion is an R surface. A cylindrical column, a hollow fiber membrane bundle accommodated in the column, and between the hollow fiber membranes at both ends of the hollow fiber membrane bundle in a state where the hollow fiber membrane bundle is brought close to the central axis side of the column And a header attached to both ends of the column, and on the surface of the header facing the sealing member, the sealing member is attached to the inner peripheral surface of the column. Of the exposed surface of the stop member facing the header, a cylindrical protrusion is provided that can contact the outer peripheral side of the exposed surface where the hollow fiber membrane bundle is not distributed, and the cylindrical protrusion is a mountain-shaped cross section that is widened from the apex A hollow fiber membrane module manufacturing method, wherein the cylindrical protrusion is formed so that the inner diameter side slope of the cross-sectional mountain shape is opened with respect to the radial line of the column as compared with the outer diameter side slope. ,
When the header is attached to the column, the cylindrical protrusion is bitten into the sealing member heated and softened.
Manufacturing method of hollow fiber membrane module.