JP2012035200A - Hollow fiber module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hollow fiber module capable of stabilizing the supply position of a potting agent at both end parts of a cylindrical part.SOLUTION: A hollow fiber module 1 includes a cylindrical part 10 in which a hollow fiber membrane A is accommodated and a lid part 11 which closes each opening end of both sides of the cylindrical part 10, and both end parts of the hollow fiber membrane A is sealed by a potting agent B at both end parts of the cylindrical part 10. At each lid part 11, the first nozzle 20 is formed, and the second nozzle 21 is formed at an inner side of the potting agent B of both end parts of the cylindrical part 10, and a nozzle opening part 21a of the second nozzle 21 is formed. The inside diameter at an end 10a of the cylindrical part 10 is larger than the inside diameter at an outside end E of the nozzle opening part 21a of the cylindrical part 10. At the endmost part including the end 10a of the cylindrical part 10, a constant large same diameter part 44, whose inside diameter is the same as the end 10a of the cylindrical part 10, is formed.

Description

  The present invention relates to a hollow fiber module.

  A hollow fiber module separates a predetermined component from a liquid using a hollow fiber membrane, and is often used for blood treatment, water treatment, gas separation treatment, and the like.

  The hollow fiber module has a cylindrical portion in which a bundle of hollow fiber membranes is accommodated, and lid portions that close open ends on both sides of the cylindrical portion, and hollow fiber membranes are formed at both ends of the cylindrical portion. Both ends of the are sealed with a potting agent. A primary-side nozzle is formed on each of the lid portions, and a secondary-side nozzle is formed near both ends of the cylindrical portion.

  In the manufacturing process of the hollow fiber module, for example, a large number of bundled hollow fiber membranes are first inserted into the cylindrical portion, and a cap is once fitted into each open end of the cylindrical portion. Next, for example, the cylindrical portion is rotated, and in this state, a potting agent is injected into the cylindrical portion from the inlet of the cap (see Patent Document 1). As a result, the potting agent is cured between the ends of the hollow fiber membranes at the ends of the cylindrical portion and between the ends of the hollow fiber membrane and the inner peripheral surface of the cylindrical portion, Both ends are sealed. Then, the excess part of the both ends of a hollow fiber membrane is cut | disconnected in a position with a potting agent, and an open end is formed in the both sides of a hollow fiber membrane. Thereafter, a lid portion with a primary nozzle is attached to each opening end of the cylindrical portion.

JP 2008-279374 A

  However, in the potting agent supply step of the hollow fiber module manufacturing process, for example, it is necessary to supply the potting agent from a potting agent supply device connected to the cap through a conduit to a narrow region in both ends of the cylindrical portion. is there. For this reason, the amount of potting agent supplied is small, and it is difficult to strictly and stably control the amount of potting agent supplied by the potting agent supply device. In addition, since the potting agent is a viscous fluid and the supply speed varies at the start of supply, the variation increases with a small supply amount, and it becomes difficult to control the supply amount of the potting agent. In particular, the sample for confirming the performance of the hollow fiber module is smaller in size than the commercially available hollow fiber module (ordinary product) that is normally used in order to reduce the amount of expensive test solution used during the performance test. However, when the hollow fiber module of the trial product is manufactured, the supply amount of the potting agent is extremely small, and it is very difficult to strictly control the supply amount.

  And if the amount of potting agent supplied is too much than the setting, the potting agent reaches the nozzle opening of the secondary nozzle, plugs the secondary nozzle, and the liquid permeability of the secondary nozzle decreases. There is a fear. Further, if the supply amount of the potting agent is too small due to the setting, the hollow fiber membrane is not sufficiently sealed, and for example, there is a possibility that liquid leaks between the primary side and the secondary side of the hollow fiber membrane. Furthermore, if the potting agent supply amount varies and the position of the inner end of the potting agent becomes unstable, the effective length of the hollow fiber membrane inside the potting agent (the length of the portion without the potting agent) varies, and the hollow fiber membrane As a result, the performance of the hollow fiber module is greatly affected.

  The present invention has been made in view of such points, and provides a hollow fiber module capable of further stabilizing the potting agent supply position (inner end position) at both ends of the cylindrical portion. Objective.

  The present invention for achieving the above object has a cylindrical portion in which a hollow fiber membrane is accommodated, and lid portions that close open ends on both sides of the cylindrical portion, and both end portions of the cylindrical portion. A hollow fiber module in which both ends of the hollow fiber membrane are sealed with a potting agent, wherein the first nozzle is formed on each lid, and the potting agent at both ends of the cylindrical portion A second nozzle is formed on the inner side to form a nozzle opening of the second nozzle, and the inner diameter at the end of the cylindrical portion is larger than the inner diameter at the outer end of the nozzle opening of the cylindrical portion. Is something that is getting bigger.

  According to the present invention, since the inner diameter of the end of the cylindrical portion is larger than the outer end of the nozzle opening of the cylindrical portion, the volume in the end portion of the cylindrical portion is increased. Thereby, the supply amount of the potting agent supplied to the end of the cylindrical portion can be increased, and the variation in the supply amount can be reduced, so that the potting agent supply position can be made more stable. As a result, the hollow fiber membrane can be reliably sealed with the potting agent. Further, it is possible to prevent the potting agent from entering and curing the second nozzle, and to ensure the liquid permeability of the second nozzle. Furthermore, the performance of the hollow fiber module can be stabilized by suppressing variations in the effective length of the hollow fiber membrane.

  An end portion including the end of the cylindrical portion may be formed with a constant large same diameter portion having the same inner diameter as the end of the cylindrical portion. In such a case, the volume in the end of the cylindrical portion becomes larger, and the amount of potting agent supplied can be increased accordingly. Thereby, the variation in the supply amount of the potting agent is reduced, and the supply position of the potting agent can be further stabilized.

  A tapered portion that gradually decreases in inner diameter toward the outer end side of the nozzle opening may be formed inside the large diameter portion. In such a case, for example, the air bubbles mixed when the potting agent is supplied move along the tapered portion without staying, so that it becomes easy to be discharged from the potting agent. Therefore, even when the inner diameter of the end of the cylindrical portion is larger than the inner diameter of the outer end of the nozzle opening, it is suppressed that bubbles remain in the potting agent, and the strength and sealing performance of the potting agent are reduced. Secured.

  Between the tapered portion and the outer end of the nozzle opening, a constant small same diameter portion having the same inner diameter as the outer end of the nozzle opening may be formed. In such a case, by positioning the inner end of the potting agent at the small diameter portion, the inner diameter of the cylindrical portion from the outer end of the nozzle opening of the second nozzle to the potting agent becomes constant. Thereby, even when the liquid flows into the cylindrical portion from the outer end of the nozzle opening to the potting agent, the liquid is easily discharged from the second nozzle. Further, the liquid permeability through the second nozzle and the cylindrical portion is improved.

  Between the outer end of the nozzle opening of the cylindrical portion and the large diameter portion, a small small diameter portion having the same inner diameter as the outer end of the nozzle opening and having a constant diameter may be formed. In such a case, by positioning the inner end of the potting agent at the small diameter portion, the inner diameter of the cylindrical portion from the outer end of the nozzle opening to the potting agent becomes constant. Thereby, even when the liquid flows into the cylindrical portion from the outer end of the nozzle opening to the potting agent, the liquid is easily discharged from the second nozzle. Further, the liquid permeability through the second nozzle and the cylindrical portion is improved.

  The inner diameter may gradually increase from the outer end of the nozzle opening of the cylindrical portion toward the end of the cylindrical portion. In such a case, since the inner peripheral surface of the end portion of the cylindrical portion is inclined, the air bubbles mixed at the time of supplying the potting agent move along the inclination and are easily discharged from the potting agent. Therefore, even when the inner diameter of the end of the cylindrical portion is larger than the inner diameter of the outer end of the nozzle opening, it is suppressed that bubbles remain in the potting agent, and the strength and sealing performance of the potting agent are reduced. Secured.

  Further, the hollow fiber module is formed with a tapered portion whose inner diameter gradually decreases from the end of the tubular portion toward the outer end side of the nozzle opening of the tubular portion, and the outside of the tapered portion and the nozzle opening. A small small-diameter portion having the same inner diameter as the outer end of the nozzle opening and having a constant diameter may be formed between the ends. In such a case, it is possible to prevent bubbles from remaining in the potting agent and to ensure the strength and sealing performance of the potting agent. In addition, the liquid that has flowed into the cylindrical portion is easily discharged from the second nozzle without stagnation near the end of the cylindrical portion. In addition, liquid permeability through the second nozzle and the cylindrical portion can be improved.

  The hollow fiber module according to any one of the above may be a trial product having a maximum potting length of 2.0 mm to 15 mm. In the case of a trial product, since the supply amount of the potting agent is extremely small and it is difficult to control the supply amount, the merit of increasing the supply amount of the potting agent by increasing the inner diameter of the end of the cylindrical portion is great.

  According to the present invention, the potting agent supply position at both ends of the cylindrical portion can be further stabilized.

It is explanatory drawing which shows the outline of a hollow fiber module. It is a longitudinal cross-sectional view which shows the shape of the internal peripheral surface of the edge part of a cylindrical part. It is explanatory drawing which shows the state which is supplying the potting agent to the edge part of a cylindrical part using centrifugal force. It is explanatory drawing of the edge part of the hollow fiber module which shows the area | region between the outer side edge of a nozzle opening part, and a sealing part. It is explanatory drawing which shows the edge part of the cylindrical part which has a taper part between a large same diameter part and a small same diameter part. It is explanatory drawing which shows the edge part of the cylindrical part which formed the taper part between the large diameter part and the outer end of a nozzle opening part. It is explanatory drawing which shows the edge part of the cylindrical part from which the internal diameter becomes large gradually toward the edge of a cylindrical part from the outer end of a nozzle opening part. It is explanatory drawing which shows the edge part of the cylindrical part which has a taper part and a small same diameter part.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Drawing 1 is an explanatory view of the longitudinal section showing the outline of the composition of hollow fiber module 1 concerning this embodiment. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  For example, as shown in FIG. 1, the hollow fiber module 1 includes a cylindrical portion 10 in which the hollow fiber membrane A is accommodated in the longitudinal direction (axial direction), and a lid portion 11 that closes open ends on both sides of the cylindrical portion 10. Have.

  The hollow fiber membrane A is accommodated in the cylindrical portion 10 in a bundle shape composed of a large number.

  Both ends of the hollow fiber membrane A are sealed with a potting agent B at both ends of the tubular portion 10. The potting agent B is hardened in a cylindrical shape, and is filled between the hollow fiber membranes A and between the hollow fiber membrane A and the inner peripheral surface of the tubular portion 10, and seals both ends of the hollow fiber membrane A. It has stopped. Note that both ends of the hollow fiber membrane A are open to the outer end face of the potting agent B.

  An end space G in which the end of the hollow fiber membrane A opens is formed inside each lid portion 11. A first nozzle 20 is formed at the center of each lid portion 11, and the end space G in the lid portion 11 communicates with the outside of the hollow fiber module 1.

  In the vicinity of both end portions of the tubular portion 10, second nozzles 21 are respectively formed. The second nozzle 21 is formed inside the potting agent B, and the outside of the hollow fiber module 1 communicates with the outer peripheral space C of the hollow fiber membrane A in the tubular portion 10.

  With this configuration, for example, the first liquid that has flowed from one first nozzle 20 of the lid portion 11 passes through the end space G and flows into the hollow fiber membrane A, and the hollow portion of the hollow fiber membrane A is It flows out to the end space G on the opposite side, and flows out from the other first nozzle 20 to the outside. Further, the second liquid that has flowed in from the second nozzle 21 of the cylindrical portion 10 passes through the outer peripheral space C of the hollow fiber membrane A and flows out of the other second nozzle 21 to the outside. When the first liquid flowing in from the first nozzle 20 passes through the pipes of the hollow fiber membranes A, the specific component passes through the fine holes on the side walls of the pipes and flows out into the outer peripheral space C. At the same time, it flows out from the second nozzle 21 to the outside. In this way, the specific component is separated from the first liquid. As another example, the liquid flowing in from the first nozzle 20 may be filtered through the hollow fiber membrane A, and the filtrate may be discharged from the second nozzle 21, and vice versa. The liquid flowing in from 21 may be filtered through the hollow fiber membrane A and discharged from the first nozzle 20. Moreover, although there are two each of the first nozzle 20 and the second nozzle 21, depending on the application of the hollow fiber module 1, only one of them may be used and the other may be sealed.

  Here, the shape of the inner peripheral surface 30 of the cylindrical portion 10 will be described. The inner peripheral surface 30 has, for example, a thin-diameter portion 40 at the center, and has a tapered portion 41, a small-diameter portion 42, a vertical portion 43, and a large-diameter portion 44 in this order from the center toward both outsides. Yes.

  The small-diameter portion 40 is formed at the center of the inner peripheral surface 30 and has a constant inner diameter or a slight draft for injection molding, and is the smallest (when there is a draft, the vicinity of the center is the smallest). . The small-diameter portion 42 has a constant inner diameter and is larger than the small-diameter portion 40. The second nozzle 21 is open to the small-diameter portion 42. The taper portion 41 exists between the small diameter portion 40 and the small diameter portion 42 and is inclined obliquely. The large-diameter portion 44 is located at the outermost end portion including the end 10a of the tubular portion 10, has a constant inner diameter and is larger than the small-equal-diameter portion 42. The vertical portion 43 is formed perpendicularly to the small-diameter portion 42 and the large-diameter portion 44, and exists between the small-diameter portion 42 and the large-diameter portion 44. The small-diameter portion 42 and the large-diameter portion 44 may have a slight draft for injection molding.

  Therefore, in the cylindrical portion 10 of the hollow fiber module 1, as shown in FIG. 2, the inner diameter D2 of the end 10a of the cylindrical portion 10 is larger than the inner diameter D1 of the outer end E of the nozzle opening 21a of the second nozzle 21. Is getting bigger. In addition, a large-diameter portion 44 having a constant diameter is formed at the outermost end portion including the end 10a of the tubular portion 10, and a nozzle opening is provided between the large-diameter portion 44 and the outer end E of the nozzle opening portion 21a. A small same diameter portion 42 having the same inner diameter as the outer end E of the portion 21a is formed. The potting agent B is formed from a position outside the outer end E of the nozzle opening 21 a in the small same diameter portion 42 to an outer end of the large same diameter portion 44. The ratio of the inner diameter D1 to the inner diameter D2 is preferably 10% to 80%. The length L1 of the large diameter portion 44 is set to be longer than, for example, the length L2 from the large diameter portion 44 of the small diameter portion 42 to the outer end E of the nozzle opening 21a.

  Next, the step of forming the potting agent B in the manufacturing process of the hollow fiber module 1 will be described. At the time of manufacturing the hollow fiber module 1, a cap 60 different from the lid portion 11 is fitted into both ends of the tubular portion 10 with the hollow fiber membrane A being accommodated in the tubular portion 10 as shown in FIG. 3. A potting agent supply device 62 is connected to the cap 60 through a conduit 61. The cylindrical portion 10 is rotated about a center line F perpendicular to the longitudinal direction of the cylindrical portion 10 and passing through the center of the cylindrical portion 10, and in this state, a predetermined amount of potting agent B is supplied to the inlet of the cap 60. Is supplied into the cylindrical portion 10. The potting agent B that has flowed into the tubular portion 10 is collected and cured at both ends of the tubular portion 10 by centrifugal force. Thereby, the potting agent B is formed outside the outer end E of the nozzle opening 21 a of the second nozzle 21. The inner end surface of the potting agent B is located on the small-diameter portion 42. Thereafter, the portion of the potting agent B that protrudes from the end 10 a of the cylindrical portion 10 is cut, and then the lid portion 11 is attached instead of the cap 60 to form the hollow fiber module 1.

  According to the above embodiment, the inner diameter D2 of the end 10a of the cylindrical portion 10 is larger than the inner diameter D1 of the outer end E of the nozzle opening 21a of the second nozzle 21, so The volume of increases. Thereby, the supply amount of the potting agent B supplied to the end portion of the cylindrical portion 10 can be increased, and the variation in the supply amount is reduced, so that the supply position (inner end position) of the potting agent B is further increased. It can be stabilized. As a result, the hollow fiber membrane A can be reliably sealed by the potting agent B. Further, the potting agent B can be prevented from entering and curing the second nozzle 21, and the liquid permeability of the second nozzle 21 can be ensured. Furthermore, the variation of the effective length of the hollow fiber membrane A can be suppressed, and the performance of the hollow fiber module 1 can be stabilized.

  The outermost end portion including the end 10a of the tubular portion 10 is formed with a constant large-diameter portion 44 having the same inner diameter as the end of the tubular portion 10 and thus has a larger volume in the end portion of the tubular portion 10. The amount of the potting agent B can be increased accordingly. Thereby, the variation in the supply amount of the potting agent B can be reduced, and the supply position of the potting agent B can be further stabilized.

  Between the outer end E of the nozzle opening 21a of the cylindrical portion 10 and the large-diameter portion 44, a small small-diameter portion 42 having the same inner diameter as the outer end E of the nozzle opening 21a and having a constant diameter is formed. In this case, by positioning the inner end of the potting agent B in the small-diameter portion 42, the inner diameter of the cylindrical portion 10 from the outer end E of the nozzle opening 21a to the potting agent B becomes constant. Thereby, for example, as shown in FIG. 4, even when the liquid flows into the cylindrical portion 10 (region R in FIG. 4) from the outer end E of the nozzle opening 21a to the potting agent B, the liquid is supplied to the second nozzle. 21 is easily discharged. Further, the liquid permeability of the liquid passing through the second nozzle 21 and the outer peripheral space C of the cylindrical portion 10 is improved.

  In the inner peripheral surface 30 of the cylindrical portion 10 described in the above embodiment, a tapered portion 70 may be formed between the small-diameter portion 42 and the large-diameter portion 44 as shown in FIG. In such a case, the air bubbles mixed when the potting agent B is supplied move along the tapered portion 70 without staying, so that the potting agent B is easily discharged. Therefore, even when the inner diameter of the end 10a of the cylindrical portion 10 is larger than the inner diameter of the outer end E of the nozzle opening 21a, the remaining of bubbles is suppressed and the strength and sealing performance of the potting agent B are ensured. Is done.

  Moreover, as shown in FIG. 6, it is good also as the taper part 70 between the large same diameter part 44 and the outer side edge E of the nozzle opening part 21a. Even in such a case, the air bubbles mixed when the potting agent B is supplied can be appropriately discharged along the tapered portion 70.

  Further, as shown in FIG. 7, the inner diameter gradually increases from the outer end E of the nozzle opening 21 a of the tubular portion 10 toward the end 10 a of the tubular portion 10 on the inner peripheral surface 30 of the end portion of the tubular portion 10. You may form the inclined surface 80 which becomes large. Even in such a case, the bubbles mixed during the feeding of the potting agent B move along the inclined surface 80 and are appropriately discharged. Therefore, even when the inner diameter of the end 10a of the cylindrical portion 10 is larger than the inner diameter of the outer end E of the nozzle opening 21a, the mixing of bubbles is suppressed and the strength and sealing performance of the potting agent B are ensured. Is done.

  Moreover, the hollow fiber module 1 is formed with a tapered portion 90 whose inner diameter gradually decreases from the end 10a of the tubular portion 10 toward the outer end E side of the nozzle opening 21a of the tubular portion 10 as shown in FIG. Between the taper portion 90 and the outer end E of the nozzle opening 21a, a constant small same diameter portion 42 having the same inner diameter as the outer end E of the nozzle opening 21a may be formed. In such a case, since the bubbles are discharged along the tapered portion 90, it is possible to suppress the bubbles from remaining in the potting agent B and to ensure the strength and sealing performance of the potting agent B. Further, the liquid that has flowed into the cylindrical portion 10 is easily discharged from the second nozzle 21 without stagnation near the end of the cylindrical portion 10. In addition, the liquid permeability through the second nozzle 21 and the cylindrical portion 10 can be improved.

  The hollow fiber module 1 described above may be a trial hollow fiber module. The hollow fiber module includes a normal product that is generally purchased and normally used, and a sample for checking the performance of the normal product before purchase, for example. In order to reduce the amount of expensive test solution used, some of the hollow fiber modules of the sample are formed to have a size smaller than that of the normal hollow fiber module. For example, the hollow fiber module of the trial product has a shape similar to that of a normal hollow fiber module, and is formed with a reduced size of about 1/3 or less. Further, the number of hollow fiber membranes A is usually several thousand or more, while the number of trial products is about 1 to 500. For example, the hollow fiber module of the trial product has an inner diameter D1 of about 1 mm to 20 mm, more preferably about 1 mm to 10 mm. For example, a normal hollow fiber module has a maximum potting portion (potting agent B portion) having a maximum length greater than 15 mm, whereas a trial hollow fiber module has a maximum potting portion length of 2.0 mm to 15 mm. It will be about. In addition, since the potting part is centrifugal molding, it has a curvature at the inner end face when viewed from above the rotation shaft, and the center part is the shortest and the outer part is the longest.

  When manufacturing a hollow fiber module of a small trial product, since the amount of potting agent B supplied is extremely small and difficult to control, the potting agent is increased by increasing the inner diameter of the end 10a of the cylindrical portion 10 as in the above embodiment. The merit of increasing the supply amount of B is great. As a result, in the sample hollow fiber module, an appropriate amount of the potting agent B is supplied to the end of the cylindrical portion 10, and the sealing property of the potting agent B and the liquid permeability of the second nozzle 21 can be ensured. . Furthermore, the variation of the effective length of the hollow fiber membrane A can be suppressed, and the performance of the hollow fiber module 1 can be stabilized. Therefore, the performance of the normal hollow fiber module can be accurately confirmed.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  For example, the shape of the inner peripheral surface 30 of the tubular portion 10 of the hollow fiber module 1 is such that the inner diameter D2 at the end 10a of the tubular portion 10 is larger than the inner diameter D1 at the outer end E of the nozzle opening 21a of the tubular portion 10. Other shapes may be used as long as they are. Moreover, other parts other than the cylindrical part 10 may have other shapes, such as the cover part 11 being comprised from several members.

  The present invention is useful for further stabilizing the potting agent supply position at both ends of the cylindrical portion of the hollow fiber module.

DESCRIPTION OF SYMBOLS 1 Hollow fiber module 10 Cylindrical part 10a End of cylindrical part 11 Lid part 20 1st nozzle 21 2nd nozzle 21a Nozzle opening part 42 Small equidiameter part 44 Large equidiameter part A Hollow fiber membrane B Potting agent E Nozzle opening Outer end D1 inner diameter D2 of nozzle opening outer end inner diameter of cylindrical end

Claims (8)

A cylindrical portion in which the hollow fiber membrane is accommodated, and lid portions that close open ends on both sides of the cylindrical portion, and both ends of the hollow fiber membrane are potting agents at both ends of the cylindrical portion. A hollow fiber module sealed by
Each lid is formed with a first nozzle,
Inside the potting agent at both ends of the cylindrical portion, a second nozzle is formed to form a nozzle opening of the second nozzle,
A hollow fiber module, wherein an inner diameter at an end of the cylindrical portion is larger than an inner diameter at an outer end of a nozzle opening of the cylindrical portion.   2. The hollow fiber module according to claim 1, wherein the end portion including the end of the cylindrical portion is formed with a constant large same diameter portion having the same inner diameter as the end of the cylindrical portion.   The hollow fiber module according to claim 2, wherein a tapered portion having an inner diameter gradually decreasing toward an outer end side of the nozzle opening is formed inside the large-diameter portion.   The hollow fiber module according to claim 3, wherein a small small-diameter portion having the same inner diameter and the same inner diameter as the outer end of the nozzle opening is formed between the tapered portion and the outer end of the nozzle opening. .   The fixed small same-diameter portion having the same inner diameter as the outer end of the nozzle opening and a constant inner diameter is formed between the outer end of the nozzle opening of the cylindrical portion and the large-diameter portion. The hollow fiber module as described.   The hollow fiber module according to claim 1, wherein the inner diameter gradually increases from the outer end of the nozzle opening of the cylindrical portion toward the end of the cylindrical portion. A tapered portion is formed in which the inner diameter gradually decreases from the end of the tubular portion toward the outer end side of the nozzle opening of the tubular portion,
The hollow fiber module according to claim 1, wherein a small small-diameter portion having the same inner diameter as the outer end of the nozzle opening and a constant inner diameter is formed between the tapered portion and the outer end of the nozzle opening. .   The hollow fiber module in any one of Claims 1-7 is a trial product whose maximum length of the length of a potting part is 2.0 mm-15 mm.

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