Manufacturing method of yarn bundle filling case and manufacturing method of fluid separation column

Abstract

To provide a manufacturing method of yarn bundle filling case capable of inserting yarn bundle composed of a large mount of yarn into a cylindrical case, with a more convenient constitution.SOLUTION: A manufacturing method of yarn bundle filling case includes a film winding process of winding a film onto a columnar yarn bundle composed of a plurality of yarns in an outer circumferential direction on a cross-section vertical to a longitudinal direction of the yarn bundle to provide a film-covered yarn bundle by providing a film overlapping part, a yarn bundle insertion process of inserting the film-covered yarn bundle into one or more cylindrical cases to provide a covered yarn bundle filling case, and a film extracting process of retaining a film overlapping part in the covered yarn bundle filling case so as to sandwich the film with a retention member which moves in a radial direction of the cross-section into the longitudinal direction to extract the film, and to obtain the yarn bundle filling case.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a fiber bundle packed case and a method for manufacturing a fluid separation column. [Background technology]

[0002] A fluid separation column, which separates and removes substances to be removed from a fluid to be treated by filtration, diffusion, adsorption, or the like, generally consists of a cylindrical case, a carrier packed inside the case, and caps that seal both ends of the case.

[0003] One example of the carrier is a fiber, i.e., a thread, which is typically packed into a cylindrical case as a cylindrical thread bundle composed of multiple threads. From the viewpoints of ease of handling and transportation costs, such a fluid separation column is preferably small. On the other hand, from the viewpoint of maintaining the removal performance of the fluid separation column despite its compact size, it is required to pack as many threads as possible densely within the case without any gaps.

[0004] As a method for densely packing a yarn bundle consisting of a large number of yarns into a cylindrical case, a method is known in which a sheet-like material is wrapped around the yarn bundle to cover it, and the pre-shaped yarn bundle is inserted into the case (Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3239693 [Patent Document 2] Patent No. 7196609 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the method described in Patent Document 1 requires excessive force when compressing and shaping many yarn bundles to increase packing density.Furthermore, the densely packed yarn bundles tend to expand inside the case after being inserted, which makes the work of removing the sheet-like material extremely difficult and cumbersome.

[0007] Furthermore, the method described in Patent Document 2 requires that cuts be made in the protective sheet beforehand, and furthermore, is restricted in that the yarn bundle cannot be inserted into multiple cases at once.

[0008] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method for manufacturing a yarn bundle filling case that is simpler in construction and that allows a yarn bundle consisting of a large amount of yarn to be inserted into a cylindrical case. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides: (1) A method for manufacturing a yarn bundle filling case is provided, comprising: a film winding step in which a film is wrapped around a cylindrical yarn bundle composed of a plurality of yarns in the circumferential direction of the cross section perpendicular to the longitudinal direction of the yarn bundle to provide a film overlapping portion to obtain a film-covered yarn bundle; a yarn bundle insertion step in which the film-covered yarn bundle is inserted into one or more cylindrical cases to obtain a covered yarn bundle filling case; and a film removal step in which the film overlapping portion in the covered yarn bundle filling case is clamped and held with a holding member that moves in the radial direction of the cross section, and the film is moved in the longitudinal direction of the yarn bundle to remove it to obtain a yarn bundle filling case.

[0010] The present invention also provides the following methods for manufacturing a fiber bundle-packed case and a method for manufacturing a fluid separation column. (2) The method for manufacturing a yarn bundle filling case according to (1) above, wherein in the film removal step, another portion of the film is further clamped and held by another holding member that moves in the radial direction of the cross section. (3) The method for manufacturing a yarn bundle filled case according to (1) or (2) above, wherein in the film winding step, the proportion of the total cross-sectional area Af of the fibers constituting the yarn bundle to the area Ac of the interior space in a cross section perpendicular to the axial direction of the case is 40 to 90%. (4) The method for manufacturing a yarn bundle filled case according to any one of (1) to (3) above, wherein in the film winding step, the proportion of the length Lo of the film overlap portion in the circumferential direction to the circumferential length Lt of the cross section is 5 to 100%. (5) The method for manufacturing a yarn bundle filling case according to any one of (1) to (4) above, wherein in the film removal step, the ratio of the width W of the film held by the holding member to the outer circumferential length Lt of the cross section is 5 to 50%. (6) The method for producing a yarn bundle filled case according to any one of (1) to (5) above, wherein the film has a thickness of 10 to 100 μm. (7) The method for manufacturing a yarn bundle filling case according to any one of (1) to (6) above, wherein the yarns constituting the yarn bundle have an irregular cross-sectional shape perpendicular to the longitudinal direction. (8) The method for manufacturing a yarn bundle filled case according to (1) or (2), further comprising a yarn bundle diameter reducing step of rotating the film-covered yarn bundle in the circumferential direction of the cross section while passing the yarn bundle through a notched plate in the longitudinal direction of the yarn bundle to reduce the diameter of the cross section. (9) The method for manufacturing a yarn bundle filling case according to (8), wherein in the yarn bundle diameter reduction step, the film-covered yarn bundle is rotated in the circumferential direction of the cross section and passed through a notched plate in the opposite direction. (10) A method for producing a fluid separation column, comprising a modularization step of sealing both ends of a fiber bundle-packed case obtained by the method for producing a fiber bundle-packed case according to any one of (1) to (7) above with caps to obtain a fluid separation column. [Effects of the Invention]

[0011] According to the present invention, not only can the sheet-like material, i.e., the film, wrapped around the yarn bundle be easily and reliably extracted and removed without requiring a complex configuration, but it can also insert one yarn bundle into multiple cylindrical cases at once and remove the film all at once, thereby providing an extremely efficient method for manufacturing a yarn bundle-filled case. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram illustrating one embodiment of a film-covered yarn bundle. [Figure 2] 2 is a schematic diagram showing a cross section (cross section at the position indicated by dashed line AA) perpendicular to the longitudinal direction of the film-covered yarn bundle shown in FIG. 1. FIG. [Figure 3] FIG. 10 is a schematic diagram showing a film removal step for removing the film from the covered fiber bundle filling case. [Figure 4] 1 is a schematic diagram illustrating one embodiment of a retaining member. [Figure 5] 10A and 10B are schematic diagrams illustrating other embodiments of the holding member. [Figure 6] 10A and 10B are schematic diagrams illustrating other embodiments of the holding member. [Figure 7] 10A and 10B are schematic diagrams illustrating other embodiments of the holding member. [Figure 8] FIG. 10 is a schematic diagram illustrating one embodiment of a notched plate. [Figure 9] 10A and 10B are schematic diagrams illustrating other embodiments of the notched plate. DETAILED DESCRIPTION OF THE INVENTION

[0013] The manufacturing method of the yarn bundle filling case of the present invention requires a film winding step in which a film is wrapped around a cylindrical yarn bundle composed of multiple yarns in the outer circumferential direction of a cross section perpendicular to the longitudinal direction of the yarn bundle, thereby creating an overlapping portion of the film to obtain a film-coated yarn bundle.

[0014] Fig. 1 is a schematic diagram illustrating one embodiment of a film-covered yarn bundle, and Fig. 2 is a schematic diagram showing a cross section (cross section at the position indicated by dashed line AA) perpendicular to the longitudinal direction of the film-covered yarn bundle 100 shown in Fig. 1. A film 102 is continuously wound around the outer periphery of a cylindrical yarn bundle 101, and the winding end position of the film 102 passes through the winding start position, providing a film overlap portion 103 where the films 102 overlap each other.

[0015] The process of wrapping the film around the cylindrical yarn bundle can be done either manually or mechanically, but it is preferable to wrap the film 102 without wrinkles or twists in order to prevent scratches on the outer periphery of the yarn bundle 101 and to reduce resistance when removing the film 102 later.

[0016] The form of the yarns constituting a cylindrical yarn bundle such as yarn bundle 101 may be either hollow or solid. Here, "hollow yarn" refers to a fiber form that is tubular and hollow inside. On the other hand, "solid yarn" refers to a fiber form that is not tubular, as opposed to "hollow yarn."

[0017] When the substance to be removed is adsorbed onto the surface of the fiber, a solid fiber is preferred because the pressure loss when the fluid to be treated flows inside and outside the hollow fiber is different, resulting in a difference in the flow rate of the fluid to be treated, which may result in a decrease in the performance of the fluid separation column.On the other hand, when removing water from the fluid to be treated or adjusting the concentration of the fluid to be treated by filtration and diffusion, the fiber is required to function as a membrane, so a hollow fiber is preferred.

[0018] The cross section of the yarns constituting the yarn bundle, taken perpendicular to the longitudinal direction, is preferably irregular in shape in order to increase the contact area with the fluid to be treated.

[0019] The fiber diameter of the fibers constituting the cylindrical fiber bundle (the outer diameter of the fibers in both the hollow fibers and solid fibers) is preferably 10 to 1000 μm, more preferably 20 to 400 μm, and even more preferably 50 to 190 μm, in order to ensure an appropriate surface area per unit volume of the fibers while maintaining appropriate pressure loss in the resulting fluid separation column and the physical strength of the fibers themselves.

[0020] The diameter of the solid yarn can be measured by randomly selecting 50 yarns from the yarns that make up a cylindrical yarn bundle, washing them with pure water, slicing the yarn bundle radially to expose the cross section, sandwiching the sample between a slide glass and a cover glass, and observing it with a projector (e.g., Nikon V-10A). More specifically, for each yarn, if the cross section is circular, the outer diameter (diameter of the outermost diameter) is measured, and if the cross section is not circular, the diameter equivalent to the circumscribed circle of the outermost circumference is measured, and the average value is calculated and rounded to one decimal place to obtain the diameter of the solid yarn.

[0021] Examples of the material of the threads constituting the cylindrical thread bundle include polymethyl methacrylate, polyacrylonitrile, polysulfone, polyethersulfone, polyarylethersulfone, polypropylene, polysulthylene, polycarbonate, cellulose, cellulose triacetate, and ethylene-vinyl alcohol copolymer. When the fluid to be treated with the resulting fluid separation column is blood, polymethyl methacrylate, polyacrylonitrile, or cellulose, which have protein adsorption properties, are preferred.

[0022] A cylindrical yarn bundle is made up of a large number of yarns aligned in the same direction, but the "plurality of yarns" may be of a single specification or may be a mixture of yarns of different specifications.

[0023] The shape of the film before being wound is not particularly limited, but from the viewpoint of ease of production and handling, it is preferably a substantially rectangular shape.

[0024] The method for producing a yarn bundle packed case of the present invention must include a yarn bundle insertion step of inserting the film-covered yarn bundle into one or more cylindrical cases to obtain a covered yarn bundle packed case.

[0025] The cylindrical case may be made of, for example, resin or metal. When the fluid to be treated by the resulting fluid separation column is blood, resin is preferred because the case is disposable. Examples of resins include polypropylene, polyethylene, polycarbonate, polystyrene, polyvinyl chloride, and acrylonitrile butadiene styrene (ABS).

[0026] The ratio of the total cross-sectional area Af of the fibers constituting the cylindrical yarn bundle to the area Ac of the interior space in a cross section perpendicular to the axial direction of the cylindrical case is preferably 40 to 90%, more preferably 50 to 70%, in order to ensure sufficient fluid separation performance while preventing an increase in pressure loss and damage to the film in the film removal process described later.

[0027] The method for manufacturing a yarn bundle filling case of the present invention requires a film removal step in which the film overlap portion in the coated yarn bundle filling case is clamped and held by a holding member that moves in the radial direction of the cross section, and the film is moved in the longitudinal direction of the yarn bundle to obtain a removed yarn bundle filling case.

[0028] FIG. 3 is a schematic diagram showing a film removal step for removing the film 102 from the covered-fiber bundle filling case 200. As shown in FIG.

[0029] The film-covered yarn bundle 100 is inserted into multiple (two in the drawing) cylindrical cases 201. Each cylindrical case 201 is fixed to a case fixing base 310 so as not to move in either the axial or radial direction. A holding unit 301 equipped with holding members 302 is positioned in the longitudinal direction of the yarn bundle 101 and moves back and forth in the same direction. A uniaxially driven robot cylinder, for example, can be used as a drive system for moving the holding unit. Note that instead of moving the holding unit, a covered yarn bundle filling case or a case fixing base such as that shown in FIG. 3 may be moved back and forth.

[0030] One or both of the holding members 302 attached to the tip of each holding unit are moved in the radial direction of the cross section perpendicular to the longitudinal direction of the yarn bundle 101 to clamp and hold the film overlapping portion 103. The drive system for performing this operation may be, for example, a parallel opening / closing type chuck that can apply a load in the thickness direction of the film.

[0031] Finally, by retracting the holding unit 301 while the film overlap portion 103 is being held, the film 102 moves in the longitudinal direction of the yarn bundle and is removed from the cylindrical case, thereby obtaining the yarn bundle filling case 300.

[0032] The film is pulled out while the holding portion holds the overlapping portion of the film, which was intentionally created during the film winding process, making the film less likely to tear and making its removal extremely easy. Furthermore, the overlapping portion of the film extending along the length of the film-covered yarn bundle is also thought to contribute to more stable film removal.

[0033] From the viewpoint of facilitating the holding of the overlapping film portion by sandwiching it with the holding member, it is preferable that the overlapping film portion extend from the end face of the yarn bundle in the axial direction of the yarn bundle filling case. On the other hand, from the viewpoint of reducing manufacturing costs, it is preferable that the amount of extending film is as small as possible, and therefore the ratio of the length of the extending film to the length of the yarn bundle in the axial direction of the yarn bundle filling case is preferably 1 to 50%, and more preferably 5 to 20%.

[0034] When removing the film, care must be taken to avoid the formation of unnecessary gaps between the cylindrical case and the fiber bundle, as the presence of such gaps may cause the treated fluid to pass through the gaps in the resulting fluid separation column, resulting in a so-called short-path condition.

[0035] To prevent the occurrence of gaps as described above while ensuring a film overlap that can be stably held by the holding member, the proportion of the length Lo of the film overlap in the circumferential direction of the cross section perpendicular to the longitudinal direction of the yarn bundle to the circumferential length Lt of the cross section is preferably 5 to 100%, more preferably 20 to 50%.

[0036] The thickness of the film is preferably 10 to 100 μm, more preferably 25 to 50 μm, in order to prevent the occurrence of gaps as described above while at the same time preventing breakage of the film.

[0037] The film material is preferably one having a static friction coefficient of 0.6 or less between films, more preferably 0.5 or less, in order to reduce resistance during removal.

[0038] Furthermore, the material is preferably one that has a static friction coefficient of 0.6 or less with respect to the cylindrical case, and more preferably one that has a static friction coefficient of 0.5 or less.

[0039] When one film-coated yarn bundle is inserted into multiple cylindrical cases as shown in Figure 3, multiple yarn bundle-filled cases can be obtained collectively by cleaving the cylindrical cases between each other in the radial direction of the film-coated yarn bundle after the film removal process.

[0040] 4 to 7 are schematic diagrams showing several embodiments of the holding member.

[0041] The material of the holding member is preferably a resin such as MC (monomer cast) nylon, polyacetal, polycarbonate, acrylic, ABS, or polyethylene, but metal such as aluminum or stainless steel may also be used.

[0042] The shape of the holding member is not particularly limited, but in order to suppress stress concentration at the film holding point due to wrinkles or folds that occur when the film is clamped and held, it is preferable that the surface that comes into contact with the film overlapping portion has a shape that has a curvature close to the curvature of the film, i.e., the outer circumference of the cylindrical yarn bundle.

[0043] To ensure sufficient force to clamp and hold the overlapping film portions, it is preferable that the width of the holding members be as large as possible. The ratio of the width W of the film held by the holding members to the peripheral length Lt of the cross section of the cylindrical yarn bundle perpendicular to the hand direction is preferably 5 to 50%, more preferably 10 to 40%. Note that when multiple overlapping film portions are clamped and held by holding members, the width W is the sum of the widths of the film held by each holding member (in the example of Figure 7, W = W1 + W2).

[0044] An anti-slip member may be provided at the tip of the holding member. The material of the anti-slip member is preferably an elastic material from the viewpoint of improving adhesion to the film and increasing frictional force. Examples of such elastic materials include natural rubber, polyurethane, silicone, vinyl chloride, and ethylene propylene.

[0045] From the viewpoint of preventing stress concentration in the overlapping portion of the film sandwiched and held by the holding members, it is preferable to sandwich and hold the overlapping portion of the film at multiple locations to distribute the stress. That is, in the film removal step included in the manufacturing method of the yarn bundle filling case of the present invention, it is preferable to further sandwich and hold other locations of the film with other holding members. Examples of methods for holding the film at multiple locations include installing multiple holding units or increasing the number of holding members attached to the tip of one holding unit.

[0046] To use the resulting fiber bundle-packed case as a fluid separation column, both ends of the fiber bundle-packed case are sealed with caps equipped with inlets and outlets for the fluid to be treated. Sealing methods include, for example, screwing, bonding, fusion, or a combination thereof. Alternatively, an elastic sealing member such as an O-ring may be placed between the fiber bundle-packed case and the cap.

[0047] The method for manufacturing a yarn bundle filled case of the present invention may include a yarn bundle diameter reduction step in which, in the yarn bundle diameter reduction step, the film-covered yarn bundle is rotated in the circumferential direction of a cross section perpendicular to the longitudinal direction of the yarn bundle, and the yarn bundle is passed through a notched plate in the longitudinal direction of the yarn bundle, thereby reducing the diameter of the cross section.

[0048] 8 and 9 are schematic diagrams showing several embodiments of the notched plate.

[0049] The thickness of the notched plate is preferably sufficiently thick to prevent deformation due to contact with the yarn bundle. On the other hand, from the viewpoint of preventing an increase in the required load due to an increase in the contact area between the yarn bundle and the notched plate, the thickness of the notched plate is preferably 2 to 10 mm, more preferably 3 to 6 mm.

[0050] Examples of materials for the notched plate include stainless steel, iron, aluminum, and engineering plastics, but stainless steel is preferred as it is less likely to deform or deteriorate due to contact with the yarn bundle.

[0051] From the viewpoint of quality protection, in order to minimize the resistance value when inserting the film-covered yarn bundle into the cylindrical case, it is preferable that the diameter of the film-covered yarn bundle after the yarn bundle diameter reduction step is equal to or smaller than the inner diameter of the cylindrical case.

[0052] In order to make the film-covered yarn bundle smaller, it is preferable that the notch of the notch plate is processed into an arc shape, and furthermore, the ratio of the arc diameter of the notch to the inner diameter of the case is preferably 0.90 to 1.00, more preferably 0.95 to 1.00.

[0053] As shown in Figure 8, a configuration in which a circular cutout portion is formed by combining two divided cutout portions may be used, or as shown in Figure 9, a combination of cutout plates divided into three or more portions may be used, but it is preferable to use a configuration in which a circular cutout portion is formed by combining the two.

[0054] Multiple notched plates may be installed to stabilize the vibration of the yarn bundle due to contact between the notched plates and the rotating yarn bundle, but it is preferable to have as few notched plates as possible in order to reduce the power required for the drive unit and notched plates.

[0055] Examples of a drive system for moving the notched plate in the radial direction of a cross section perpendicular to the longitudinal direction of the yarn bundle include a single-axis driven robot cylinder or air cylinder, but when moving the two divided notched plates in parallel from the left and right, a parallel opening / closing type chuck is preferred.

[0056] The movement of the notched plate in the longitudinal direction of the yarn bundle may involve moving only the yarn bundle, or only the notched plate, or even both the yarn bundle and the notched plate. However, moving only the notched plate is preferred, as this results in the simplest device configuration.

[0057] When only one end of the yarn bundle is held, it is preferable that the notched plate be moved from the side where the yarn bundle is held to the other end side in order to prevent deterioration of the yarn bundle quality due to buckling of the yarn bundle.

[0058] The diameter of the yarn bundle gradually decreases as the notched plate and the rotating yarn bundle continue to be in partial contact with each other, so it is preferable that the rotation speed of the yarn bundle is higher than the movement speed of the notched plate. From the viewpoint of improving production efficiency, the ratio of the movement speed (mm / s) of the notched plate to the rotation speed (rps) of the yarn bundle is preferably 0.5 to 30.0, and more preferably 1.0 to 20.0.

[0059] In the method for manufacturing a yarn bundle filled case of the present invention, in the yarn bundle diameter reducing step, the film-covered yarn bundle may be rotated in the circumferential direction of the cross section and passed through a notched plate in the opposite direction.

[0060] As mentioned above, when only one end of the yarn bundle is held, there is a concern that the yarn bundle may buckle if the notched plate is moved from the other end to the side where the yarn bundle is held. However, by first moving the notched plate from the side where the yarn bundle is held to the other end, i.e., in the opposite direction, and reducing the diameter of the yarn bundle, the yarn bundle becomes denser and more rigid, preventing buckling and making it possible to maintain a high-quality yarn bundle.

[0061] Because the diameter of the yarn bundle is reduced in advance, the speed at which the notched plate is moved in the reverse direction and the rotation speed of the yarn bundle may be increased. In this case, the ratio of the movement speed (mm / s) of the notched plate to the rotation speed (rps) of the yarn bundle is preferably 0.5 to 30.0, and more preferably 3.0 to 30.0. [Example]

[0062] Hereinafter, an example of the present invention will be described, but the scope of the present invention is not limited to the following example.

[0063] [Example 1] A yarn bundle was prepared by fixing the ends of 136,300 solid yarns (average fiber diameter 113 μm, fiber length 290 mm) made of acrylic resin (methyl methacrylate; PMMA) with tape (GJ18W-50, manufactured by Nirei Kogyo Co., Ltd.).

[0064] (Film wrapping process) A 50 μm-thick polyethylene terephthalate film was prepared and cut to a size of 310 mm in the longitudinal direction and 240 mm in the winding direction, and this was manually wrapped around the outer circumference of the yarn bundle to obtain a film-coated yarn bundle with a diameter of 57.6 mm and a film overlap of 67 mm in length Lo. The width of the film extending from the end face of the yarn bundle in the longitudinal direction of the yarn bundle was 20 mm.

[0065] (Yarn bundle diameter reduction process) The obtained film-covered yarn bundle was passed through a notched plate in the longitudinal direction of the yarn bundle while being rotated, thereby reducing the cross section of the yarn bundle and obtaining a film-covered yarn bundle with a diameter of 55.1 mm.

[0066] (Yarn bundle insertion process) The film-covered fiber bundles with reduced cross-sectional diameter were inserted into four transparent cylindrical cases made of polycarbonate (inner diameter 52 mm, length 42 mm) to obtain cases filled with covered fiber bundles.

[0067] (Film removal process) Two acrylic holding members (film holding width 36 mm, radius of curvature 26 mm) equipped with polyurethane anti-slip members (thickness 1 mm, width 39 mm) were attached to the tip of the holding unit so that they faced each other. Each was moved radially along the yarn bundle to hold the overlapping film between them. The holding unit was then retracted longitudinally along the yarn bundle at a speed of 50 mm / s, moving the film in the same direction and removing it from the cylindrical case, yielding a yarn-bundle-filled case. The load applied when removing the film was measured using a force gauge (Nidec-Shimpo; FGP-20) and was found to be 500 N.

[0068] It was confirmed that there were no tears or chips in the removed film, and that no film remained inside the cylindrical case.

[0069] [Example 2] Except for changing the shape of the holding member (film holding width 59 mm, curvature radius 26 mm), a yarn bundle-filled case was obtained under the same conditions as in Example 1. It was confirmed that the removed film had no tears or chips, and that no film remained inside the cylindrical case.

[0070] [Example 3] A film-coated yarn bundle was obtained under the same conditions as in Example 1. The obtained film-coated yarn bundle was rotated and passed through a notched plate in the longitudinal direction of the yarn bundle, and then passed through another notched plate in the opposite direction to reduce the cross section of the yarn bundle, yielding a film-coated yarn bundle with a diameter of 54.4 mm.

[0071] Thereafter, the yarn bundle insertion step and the film removal step were carried out under the same conditions as in Example 1 to obtain a yarn bundle-filled case. The load when removing the film was 480 N, and it was confirmed that there were no tears or chips in the removed film, and that no film remained inside the cylindrical case.

[0072] [Comparative Example 1] An attempt was made to obtain a yarn bundle-filled case under the same conditions as in Example 1, except that the holding member held the non-overlapping portion of the film. However, the film broke during the film removal process, and the film remained inside the cylindrical case.

[0073] Comparative Example 2 An attempt was made to obtain a yarn bundle-filled case under the same conditions as in Example 2, except that the holding member held the non-overlapping portion of the film. However, the film broke during the film removal process, and the film remained inside the cylindrical case. [Industrial Applicability]

[0074] The present invention can be used, for example, in the production of water or blood purification columns. [Explanation of symbols]

[0075] 100 film-covered yarn bundle 101 Thread bundle 102 Film 103 Film overlap 200 Covered yarn bundle filling case 201 Cylindrical case 300 Yarn Bundle Filling Case 301 Holding Unit 302 Retaining member 303 Anti-slip materials 310 Case Fixing Stand 320 Notched board 321 Notch

Claims

1. a film winding step of winding a film around a cylindrical yarn bundle composed of a plurality of yarns in a circumferential direction of the yarn bundle in a cross section perpendicular to the longitudinal direction of the yarn bundle to provide an overlapping portion of the film, thereby obtaining a film-covered yarn bundle; a yarn bundle inserting step of inserting the film-covered yarn bundle into one or more cylindrical cases to obtain a covered yarn bundle filled case; a film removal step of clamping and holding the overlapping film portion in the covered yarn bundle filling case with a holding member that moves in the radial direction of the cross section, and moving the film in the longitudinal direction of the yarn bundle to obtain a removed yarn bundle filling case.

2. 2. The method for manufacturing a yarn bundle filling case according to claim 1, wherein in the film removing step, another portion of the film is further sandwiched and held by another holding member that moves in a radial direction of the cross section.

3. 3. The method for manufacturing a yarn bundle filled case according to claim 1, wherein in the film winding step, a ratio of the total cross-sectional area Af of the fibers constituting the yarn bundle to the area Ac of the inner space in a cross section perpendicular to the axial direction of the case is 40 to 90%.

4. 3. The method for manufacturing a yarn bundle filling case according to claim 1, wherein in the film winding step, the ratio of the length Lo of the film overlap portion in the circumferential direction to the circumferential length Lt of the cross section is 5 to 100%.

5. 3. The method for manufacturing a yarn bundle filling case according to claim 1, wherein in the film removal step, a ratio of the width W of the film held by the holding member to the outer circumferential length Lt of the cross section is 5 to 50%.

6. The method for manufacturing a yarn bundle filling case according to claim 1 or 2, wherein the film has a thickness of 10 to 100 μm.

7. 3. The method for manufacturing a yarn bundle filling case according to claim 1, wherein the yarns constituting the yarn bundle have an irregular cross-sectional shape perpendicular to the longitudinal direction.

8. 3. The method for manufacturing a yarn bundle filling case according to claim 1, further comprising a yarn bundle diameter reducing step of rotating the film-covered yarn bundle in a circumferential direction of the cross section while passing the yarn bundle through a notched plate in a longitudinal direction of the yarn bundle to reduce the diameter of the cross section.

9. 9. The method for manufacturing a yarn bundle filling case according to claim 8, wherein in the yarn bundle diameter reducing step, the film-covered yarn bundle is rotated in the circumferential direction of the cross section and is passed through a notched plate in the opposite direction.

10. 3. A method for producing a fluid separation column, comprising a modularization step of sealing both ends of the yarn bundle packed case obtained by the method for producing a yarn bundle packed case according to claim 1 or 2 with caps to obtain a fluid separation column.

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