JP4942588B2 - Connection method of hollow porous body - Google Patents

Description

  The present invention relates to a method for connecting hollow porous bodies.

  In recent years, attention has been paid to water treatment by a membrane method using a compact filtration membrane that can be completely separated due to increasing interest in environmental pollution and strengthening various regulations. When such a filtration membrane is used for water treatment, high mechanical properties are also required. Therefore, as a method for producing a porous filtration membrane excellent in pressure resistance, tensile strength, etc., a method for producing a string-like porous membrane using a hollow round braided braid as a hollow fiber membrane support (Patent Documents 1, 2, 3) has been proposed.

  The basic shape of such a hollow fiber membrane (hollow fiber membrane) is that the membrane forming stock solution is spun from the outer periphery of the annular nozzle, the hollow fiber membrane support is supplied from the center hole of the annular nozzle, and the membrane forming stock solution is applied to the outer periphery. It is obtained by solidifying. In order to obtain a hollow fiber membrane having an appropriate length, this step needs to be performed continuously, and further, continuous supply is performed by connecting the supports. Here, when the connection of the hollow fiber membrane support is not properly performed, the connection strength is insufficient, and the diameter of the connection portion is increased. It is conceivable that the hollow fiber membrane support may be clogged or caught in the center hole of the annular nozzle whose diameter is regulated, causing a decrease in the stability of this process. However, although a string connecting method has been known so far, no specific technique has been proposed for a method for connecting a string (hollow porous body) having a hollow portion inside.

  As a method for joining the string members, a method has been proposed in which both fibers to be connected are aligned and overlapped and entangled by needle piercing (see Patent Document 4). However, considering the application of the prior art to a hollow porous body, when the hollow porous body is a braided cord or a braided cord, the fiber bundle is subjected to a braiding or knitting process. It is difficult to obtain the effect of entanglement by threading, splitting is necessary for braided strings, and if splitting is performed for knitted strings, there is a possibility that a hollow string form cannot be maintained. In addition, when another fiber bundle is added for connection and needle piercing is performed, poor connection through the manufacturing process due to an increase in diameter of the connecting portion occurs, and sufficient entanglement cannot be obtained, resulting in insufficient connection strength. In addition, there is a possibility that the cut end portion becomes fuzzy and becomes larger in diameter after the film forming solution is applied.

  Moreover, the method (refer patent document 5, 6) which connects a string body using an adhesive agent is proposed. In Document 5, the connection strength depends on the adhesive. Here, considering application of the present technology to a hollow fiber support, the connection area of the cut portion is small, and there is a possibility that desired strength expression may be difficult.

Furthermore, also in Document 6, the braid is not a hollow structure because the core rubber is contained in the core rubber. Furthermore, since the end portion overlaps the string-like object, there is a possibility of increasing the diameter. Further, since the connection is an adhesive, the same problem as described above may occur.
Japanese Patent Laid-Open No. 52-81076 JP-A-5-7746 WO04 / 43579 pamphlet JP-A-62-243836 Japanese Patent No. 2936092 JP 2000-248457 A

  The object of the present invention is to improve the problems such as insufficient connection strength that occurs when connecting the hollow porous body and the diameter of the connection part, and further, during the production of the hollow fiber membrane due to these problems It is intended to provide a method for connecting a hollow porous body that improves a decrease in the stability of the production process and enables the production and processing of a stable hollow fiber membrane.

  In order to achieve the above object, the present invention, when connecting a plurality of hollow porous bodies, insert both ends of the core material into the hollow portions of both of the hollow porous bodies to be connected, the hollow porous body and the core material It is preferable to fix the hollow porous body and the core material by one or a combination of frictional force, fusion, adhesion, and anchor effect.

  Further, it is preferable that the hollow porous body and the core material are fixed by winding a thread around the insertion portion outer periphery of the hollow porous body in which the core material is inserted into the hollow portion, causing a change in the diameter of the hollow porous body. It is also preferable that the hollow porous body and the core material are fused and fixed by ultrasonic waves from the outer periphery of the hollow porous body in which the core material is inserted into the section.

  Moreover, it is also preferable that the hollow porous body or the core material is cut by a heating wire heated by energization in advance before the hollow porous body is connected, and at the same time, the cut surface is melted and integrally processed.

  The hollow porous body is preferably a hollow fiber membrane and a support for hollow fiber membrane, and the hollow fiber membrane support is preferably a hollow braid and a braid.

  When connecting a plurality of hollow porous bodies, both ends of the core material are inserted into the hollow portions of both of the hollow porous bodies to be connected, and the hollow porous body and the core material are fixed. Problems such as insufficient connection strength and an increase in the diameter of the connection portion are improved, and the hollow fiber membrane can be stably manufactured and processed.

Hereinafter, the best mode for carrying out the present invention will be described in detail.
In the present invention, when connecting a plurality of hollow porous bodies, both ends of the core material are inserted into the hollow portions of both of the hollow porous bodies to be connected, and the hollow porous body and the core material are fixed. Connect the body.

  The hollow porous body referred to in the present invention is an outer appearance having a substantially circular shape when viewed in a cross section perpendicular to the central axis in the longitudinal direction of the hollow porous body, and is continuous in the longitudinal direction inside. Any structure may be used as long as it has one or more spaces (hereinafter referred to as hollow portions) and the wall surface has a communication hole connecting the outer periphery and the hollow portion. For example, a hollow braid, a braid, and a hollow fiber membrane are mentioned, It uses suitably for the braid and braid used especially for the support body of a hollow fiber membrane. The outermost diameter of the hollow porous body is not particularly limited, but a size of about 1 mm to 5 mm is preferably used in the method of the present invention.

  The material used for the hollow porous body is not particularly limited as long as it is used for synthetic fibers, separation membranes, and the like. For example, polyethylene terephthalate, nylon, polyethylene, polypropylene, PVC, polysulfone, polyacrylonitrile, A single or a combination of cellulose acetate, polyvinylidene fluoride, etc. may be mentioned.

  As the core material in the present invention, any material can be used as long as it can be inserted into the hollow portion of the hollow porous body, and it is appropriately selected depending on the strength to be connected, the material of the hollow porous body, and the connection conditions. That's fine. For example, in order to improve the insertability, a plurality of fibers or single yarns or strands that have been converged by existing means such as braiding, knitting, twisting, or converging agents, or the surface thereof being roughened, burrs, protrusions Composite members that share the surface with improved surface shape and strength connection, such as providing anchor parts, etc., metal composite materials such as coated electric wires and metal powder containing materials that can detect the insertion point of the core material with a metal detector And a magnetic material-mixed composite material capable of detecting magnetic force.

  The core material is inserted into the hollow portion of the hollow porous body in order to connect the hollow porous body. The insertion length and appearance shape may be appropriately selected according to the strength to be connected, the material of the hollow porous body, and the connection conditions, as described above. After the insertion, the connecting end surfaces of the hollow porous body may be brought into contact with each other so that the core material cannot be seen from the outside, or the connecting end surface may be separated to make the core material visible from the outside. After the core material is inserted into the hollow porous body and subjected to the connection treatment, it is necessary that the outer diameter does not become such a size as to hinder the passage of the process.

  In addition, the ratio of the cross-sectional area perpendicular to the longitudinal central axis of the hollow part before connection to the cross-sectional area perpendicular to the longitudinal central axis of the core is appropriately selected depending on the desired connection strength and the material and cross-sectional area ratio. Just do it. For example, in the case of connection using an ultrasonic wave, approximately 25% or more is preferable although it depends on the tensile strength required for the connection portion and the strength of the core material. If the outer diameter of the core material is almost uniform and less than 25%, the gap between the hollow portion and the core material becomes large, and it may be difficult to obtain sufficient bonding strength, or the tensile strength of the core material may be insufficient. There is a possibility of concern. Further, when the outer diameter of the core material changes in a cross section perpendicular to the central axis in the longitudinal direction, the connection strength can be developed, but the tensile strength of the core material may be insufficient in a portion having a small cross-sectional area.

  Even if it exceeds 100%, that is, the outer diameter of the core material is larger than the outer diameter of the hollow portion of the hollow porous body, and the hollow porous body deforms and expands when the core material is inserted, the core material is melted by heat, etc. It can be used sufficiently if it can be accommodated within the desired outer diameter when the connection process is finally completed, for example, by filling a void such as a communicating hole portion of the hollow porous body.

In the present invention, in order to connect a plurality of hollow porous bodies, when both ends of the core material are inserted into both hollow portions of the hollow porous bodies to be connected, the hollow porous body and the core material have a frictional force, It is preferable to be fixed by one or a combination of fusion, adhesion and anchor effect.
Fixing the hollow porous body and the core material is such that the outer diameter of the connecting portion of the hollow porous body does not affect the process passability so that the core material inserted into the hollow portion of the hollow porous body does not come off. As long as the core material is inserted and fixed, any method may be used. As for the connection strength, the greater the number of contact portions contributing to the connection between the hollow porous body and the core material, the better the connection strength. Therefore, when high connection strength is required, this can be achieved by extending the insertion length as a part that contributes to the connection.

  The frictional force referred to in the present invention refers to a drag that is generated at the contact portion between the hollow porous body and the core material and prevents the core material from coming out of the hollow portion. As an improvement in connection strength, there are means such as an increase in surface pressure and contact area, and a coefficient of friction on the contact surface is increased. Any method may be used as long as the connection strength can be improved by these frictional forces.

  As an example of fixing using the frictional force between the hollow porous body and the core material, a method using a splicer or the like will be described with reference to FIG. FIG. 1 is a schematic half cross-sectional view showing a connection portion of a hollow porous body. The right side of the wavy line around the center is a cross-sectional view.

  The hollow porous body is deformed by winding the fiber bundle 2 around the outer peripheral portion of the hollow porous body 1 into which the core material 3 is inserted so that the outer periphery of the hollow porous body 1 is reduced. The contact pressure on the core material is improved along with an increase in the contact portion of the core material outer surface. In such a case, it is preferable that the outer periphery of the core material has a high frictional force. For example, a braid provided with a converging agent is improved in insertion property into the hollow portion and is preferably used. Further, in addition to the frictional force alone, a combination such as fusion, adhesion, or forming a core material with an anchor effect is also preferable.

  In order to improve the frictional force, the amount, pitch, length, material, etc. for winding the fiber bundle that deforms the hollow porous body should be appropriately selected in consideration of the required connection strength and various conditions of the passing process. That's fine. The fiber bundle to be wound may be made of any material and shape as long as it can be connected by winding. When the fiber bundle ends after winding protrude like a fluff, use a relatively thin fiber so as not to increase the outer diameter of the connection part of the hollow porous body, or use a converging agent on the end face A method of converging is also preferably used.

  The fusion referred to in the present invention is between the hollow porous body and the core material inserted into the hollow portion of the hollow porous body, either the hollow porous body or the core material, or all of either one of them. The part is in a molten state, and at the contact part, the other member is taken into the melted interior and solidified, combined and integrated, or connected in one or a plurality of states such as entering the gap between the other member That means. As a method for melting the member, any method may be used as long as it can be melted, and examples thereof include ultrasonic vibration, high-frequency induction heating, laser heating, and heater heating.

  When the core material and the hollow porous body are fused, the material of the core material and the hollow porous body may be appropriately selected in consideration of how to melt. For example, if the core material is to be melted, the core material should be selected to have a lower melting point than the hollow porous body. If the hollow porous body is to be melted, the core material has a higher melting point, contrary to the above. do it. Moreover, what is necessary is just to select the material with the same or almost the same melting | fusing point, when melting both. The part to be fused may be fused in either the longitudinal direction or the circumferential direction of the connecting part, and the fused part may be continuous or discontinuous, but the fused part should be as non-extreme as possible. It is preferable to connect so as not to impair the characteristics of the connecting portion, particularly bendability. Depending on the tension applied to the hollow porous body when the hollow porous body, in particular the hollow fiber membrane support, passes through the guide of the annular nozzle during the hollow fiber membrane processing, if the rigidity of the connecting portion is too high, it will lead to the guide This may cause a decrease in the stability of the manufacturing process.

  As an example of using fusion, a method using ultrasonic vibration will be described with reference to FIG. FIG. 2 is a schematic half sectional view showing a connection part of the hollow porous body. The right side of the wavy line around the center is a cross-sectional view.

  An ultrasonic horn is brought into contact with the ultrasonic horn from the outer periphery of the insertion portion of the hollow porous body 1 in which the core material 3 is inserted into the hollow portion, and a pressing force is applied to the connecting portion, and the core material 3 is oscillated. One or both of the hollow porous bodies 1 are melted and deformed to form the fused portion 4. Ultrasonic fusion is preferably used because it can be connected in a short time, and the member is difficult to adhere to the ultrasonic horn or jig.

  At this time, if a core material having a melting point lower than that of the hollow porous body is used, a part or all of the core material is first melted and connected by melting deformation of the core material and intrusion into the gap of the hollow porous body. . The shape of the tip of the horn or jig that applies pressure can be any shape as long as surface pressure can be applied, and protrusions are placed on both the horn and / or jig to fuse multiple locations at once. It is preferable to do. It is also preferable to rotate or move the horn or jig for continuous fusion or discontinuous fusion. The shape of the core material is preferably a shape that fills the hollow part of the hollow porous body. When the hollow part is a columnar shape, a simple columnar shape is preferable from the viewpoint of the cost of the core material. Further, in addition to fusion, it is also preferable to improve the connection strength by using a combination of frictional force, adhesion, and forming a core material with an anchor effect.

  The term “adhesion” as used in the present invention refers to applying and solidifying an adhesive capable of adhering both to the hollow part of the hollow porous body and the outer periphery of the core material or both. In addition, the adhesive can be used regardless of the compatibility with each connecting member, and should be selected as appropriate in consideration of the required connection strength and various conditions of the manufacturing process that passes when the hollow fiber membrane is manufactured. That's fine.

  In order to improve the working efficiency, an adhesive that solidifies in a short time is preferably used. As in the case of fusion, the part to be bonded may be bonded in either the longitudinal direction or the circumferential direction of the bonded part, and the connecting part may be continuous or discontinuous, but the connecting part is as non-contact as possible. It is preferable to connect so as not to impair the characteristics of the connecting portion, particularly bendability. Depending on the tension applied to the hollow porous body, especially when the hollow fiber membrane support passes through the guide of the annular nozzle when the hollow fiber membrane is processed, the guide may be provided if the rigidity of the connecting portion is too high. This may cause a decrease in the stability of the manufacturing process, such as a decrease in follow-up performance. Therefore, what is necessary is just to select a usage-amount, a usage location, etc. suitably as needed.

  In addition to adhesion, it is also preferable to use a combination of frictional force, fusing, and forming a core material with an anchor effect. The anchor effect referred to in the present invention means that a protrusion or a hook-like catching part is provided in any one or both of the hollow part of the hollow porous body and the outer periphery of the core member regardless of the longitudinal direction or the circumferential direction. Any shape is possible as long as it is possible to prevent the core material acting between the hollow porous body and the core material from coming off. When processing the anchor effect manifesting shape, it is usually easier to impart the shape to the outer periphery of the core material inserted into the hollow part of the hollow porous body, so that the outer periphery of the core material is usually processed.

  Examples of anchor effect expression shapes include bamboo shoot-like tube connector shapes used when connecting hoses, polygonal pyramid shapes such as triangular pyramids and quadrangular weights, cross-shaped projections, burrow shapes seen at the tips of fishhook tips, The shape as seen on a saw blade, the shape of the brush that stands radially in the circumferential direction to clean the glass tube, etc. The hook direction of the hook in the same direction or in the opposite direction with respect to the circumferential direction There is a shape to change. These anchor effect expression shapes may be selected in consideration of the number, shape, and combination as appropriate according to the desired connection strength. In addition to the anchor effect, a combination of frictional force, fusion, and adhesion is also preferable.

  In the connection method of the present invention, when the hollow porous body has heat shrinkability, the hollow porous body is contracted by heating after inserting the core material into the hollow portion, and the adhesion between the hollow porous body and the core material is improved. Increasing the power is also an effective technique for expressing the connection strength.

Prior to the connection of the hollow porous body, it is preferable for the suitable connection of the hollow porous body to cut the hollow porous body or the core material at the same time and simultaneously melt and cut the cut surface. In the present invention, as a hollow porous body or a core material, braided braids or knitted braids composed of a plurality of fibers may be used.
Prior art relating to melting of the cut portion of the string-like body, that is, a method of heating and melting a blade (see Japanese Patent Publication No. 60-36917), and a cutting device for connecting a cutting member to an ultrasonic wave or a heat generating device (Japanese Patent Laid-Open No. 2002) -1693), when using a cutting device using a heated cutting blade with a heater inside the cutting blade (see Japanese Patent Laid-Open No. 7-314389), the blade has a large heat capacity, and the blade reciprocates. And the contact time with the heated blade surface becomes longer, so that the resin melted on the cut surface is likely to cause a large amount of heat sagging, and further, deformation of the cutting member due to the pressing force at the time of cutting The resin melted excessively becomes difficult to maintain the hollow shape, which may hinder the connection after cutting.

  In the present invention, in order to improve these problems of the prior art, the cut portion is melted by a heating wire having a small heat capacity and a small contact area. It is preferable that the hollow porous body or the core material is cut by a heating wire heated by energization, and at the same time, the cut surface is melted and integrally processed.

  In the present invention, when the cut surface is integrally processed simultaneously with the cutting process, the hollow porous body or the core material (hereinafter collectively referred to as a member) is a string-like body made of a plurality of fibers such as braids and braided strings. In addition, in the process of melting and cutting a member, it refers to adhering a plurality of scattered fibers by melting at the time of cutting while preventing the cutting surface from fraying and fraying.

  When using a core material composed of a plurality of fibers such as braids and braids when cutting, if the cut surface cannot be integrally processed, when inserting into the hollow part of the hollow porous body at the time of cutting or after cutting In some cases, the leading end of the core material spreads, making it difficult to insert or obtaining a required insertion length.

  Also, when a hollow braid or braid is used for the hollow porous body, if the cut surface cannot be integrally processed, the cut surface when the core material is inserted into the hollow portion of the hollow porous body at the time of cutting or after cutting May be scattered and it may be difficult to suppress the outer diameter to a desired value. Furthermore, when the connection process is performed in the vicinity of the cut surface, the hollow porous body may be scattered during the connection process, and it may be difficult to suppress the connection failure or a desired outer diameter.

  The cutting process of the core material insertion port of the hollow porous body and the insertion tip of the core material is preferably performed immediately before the hollow porous body is connected. In the case where some trouble occurs in the connection of the hollow porous body or for the purpose of shortening the working time, it is preferable to perform from the disconnection to the connection in a short time immediately before the connection, and the method of the present invention is suitable.

  The cut surface in the cutting process may be cut at any angle with respect to the longitudinal axis of the member. For example, when cutting a hollow porous body, both cut surfaces to be connected may be at the same angle or different. Preferably, the surface is perpendicular to the longitudinal axis of the member so as to minimize molten resin.

  The heating wire of the present invention refers to a heating wire that generates heat when energized, and any wire may be used as long as it can generate heat. For example, nickel chrome series, iron chrome series, platinum, etc. are mentioned. Since these heating wires have a short contact time with the cutting member, the heat sag portion generated in the direction of increasing the outer diameter of the member after cutting is small, and the diameter change of the member is small. If the heating wire is thick, the contact time with the member will be long like a heated blade, and there is a possibility that heat sag will increase.If the heating wire is thin, the heat capacity necessary for cutting may be insufficient, The life of the heating wire may be reduced. Therefore, the diameter of the heating wire is preferably 0.1 mm or more and 1 mm or less.

  The temperature of the heating wire may be a temperature equal to or higher than the melting point of the member, and is preferably equal to or higher than the thermal decomposition temperature of the member. When the temperature of the heating wire is low, the resin melted at the time of cutting may adhere to the heating wire, and a phenomenon such as stringing may occur.

  Cutting with a heating wire requires less force to deform the shape at the time of cutting. For example, even when a hollow portion exists like a hollow porous body, cutting can be performed while maintaining the hollow shape. Moreover, by applying an appropriate tension to the member at the time of cutting, the member is deformed in a direction in which the diameter of the member is reduced and works in a direction in which the diameter of the cut surface is prevented from being increased. This is also preferable because it assists the user to leave. On the other hand, if too much tension is applied, melt deformation may occur at the cut portion, and a good cut surface may not be obtained. What is necessary is just to set suitably the tension | tensile_strength applied to the member at the time of a cutting | disconnection according to the required cut surface shape.

  When the hollow porous body is connected using the present invention, the hollow fiber membrane can be produced continuously for a long time, which is preferable. The connection part of the hollow porous body by the core material may be used temporarily during the production of the hollow fiber membrane. Normally, a hollow fiber membrane obtained continuously is cut into an appropriate length, and then a plurality of the hollow fiber membranes are appropriately processed into a module or the like, but the connecting portion including the core material is removed during this processing. May be discarded.

  In the present invention, when connecting a plurality of hollow porous bodies, both ends of the core material are inserted into the hollow portions of both of the hollow porous bodies to be connected, and the hollow porous body and the core material are fixed. Problems such as insufficient connection strength of the membrane support and an increase in the diameter of the connection portion are improved, and stable production and processing of the hollow fiber membrane is possible.

  Further, when connecting a plurality of hollow porous bodies, both ends of the core material are inserted into the hollow portions of both of the hollow porous bodies to be connected, and the hollow porous body and the core material are subjected to frictional force, fusion, adhesion, anchor By fixing with a single effect or a combination of a plurality of effects, problems such as insufficient connection strength of the hollow fiber membrane support and an increase in the diameter of the connection portion can be improved.

  Further, when connecting a plurality of hollow porous bodies, both ends of the core material are inserted into both hollow portions of the hollow porous bodies to be connected, and the outer periphery of the insertion portion of the hollow porous body in which the core material is inserted into the hollow portion. Wind the thread to cause a change in the diameter of the hollow porous body, or from the outer periphery of the hollow porous body with the core material inserted into the hollow portion, the hollow porous body and the core material are fused and fixed by ultrasound. By doing so, the connection strength can be improved.

  Also, before the connection, the hollow porous body or the core material is cut with a heating wire heated by energization in advance, and at the same time, the cut surface is melted and integrally processed to suppress the scattering of the connection surface. It is possible to reduce problems such as an increase in the diameter of the connection portion when connecting a plurality of hollow porous bodies.

Hereinafter, the present invention will be described in more detail based on examples. The connection strength was measured by the following method. As a measurement of connection strength, a digital force gauge (ZP-500N) manufactured by Imada Co., Ltd. was used.
First, knots are made at both ends of the hollow porous body after connection. Next, a metal plate processed with a slit having a width of 2 mm is set on the digital force gauge and the fixed part, and the hollow porous body is inserted into the slit part and hooked with a knot. Turn the digital force gauge in the vertical direction, turn on the digital force gauge with no tensile tension applied to the hollow porous body, reset the displayed value to zero, manually pull, and hold the peak. The maximum load was measured using the function.

<Example 1>
As shown in FIG. 1, the hollow porous body 1 has an outer diameter of 2.4 mm, an inner diameter of 1.2 mm, and a hollow braid (material polyethylene terephthalate, hereinafter referred to as PET) having a batting number of 16 and an outer diameter of 1 mm as a core material 3. A braided cord (material PET) having 8 batting numbers was used. First, both hollow porous bodies 1 to be connected were cut with scissors. The core material 3 was attached and converged on the core material using oil-based ink as a sizing agent, and then cut with scissors.

Next, the core material 3 was inserted into the hollow part of the hollow porous body 1 by about 20 mm to 50 mm so that the core material 3 was exposed by about 40 mm to 100 mm. Next, it is set in a splicer (ILLMAN SPLICER CODE101 manufactured by MESSAN), and wound around the outer periphery of the hollow porous body 1 from the cut surface to the longitudinal direction, with a winding length of about 1 cm to 2 cm, 1.5 reciprocations, hollow porous The body 1 was wound so as to be deformed and reduced. Thereafter, the core material 3 was inserted into the other hollow porous body 1 by about 20 mm to 50 mm, and wound around the outer periphery of the insertion portion with a splicer as described above. PET fiber was wound as the wound yarn 2 by the splicer.
The connection strength after connection was 20 to 60 N, and sufficient strength was expressed. Further, the flexibility of the connecting portion was not greatly impaired, and the outer diameter smoothly passed through the 2.5 mm hole, and the stability of the manufacturing process was not lowered during the production of the hollow fiber membrane.

<Example 2>
As shown in FIG. 2, the hollow porous body 1 has an outer diameter of 2.1 mm, an inner diameter of 0.9 mm, and a hollow knitted string (material PET) having a knitting number of 8 and the core material 3 has a PVDF of an outer diameter of 0.88 mm. Fiber was used. First, both hollow porous bodies 1 to be connected were melted and cut with a red hot nichrome wire having a diameter of 0.28 mm, and the core material 3 was cut to a length of about 90 mm with scissors. Next, the core material 3 was inserted into the hollow portion of the hollow porous body 1 so that the insertion lengths were substantially equal, and the cut surfaces of both hollow porous bodies 1 were brought together.

Next, a jig having a width of 2.1 mm and a depth of 3.05 mm and a groove having an R shape at the bottom was prepared, and the connecting portion of the hollow porous body 1 was fixed thereto. The horn that generates an ultrasonic wave with an output of 35 W and an oscillation frequency of 40 kHz has a comb-like shape in which four squares with a tip of 0.4 mm × 0.4 mm are arranged linearly at a pitch of 1.7 mm. From the outer periphery of the hollow porous body 1 in which 3 was inserted, oscillation occurred at each of four locations at 2.3 seconds / time, and the hollow porous body 1 and the core material 3 of the fused portion 4 were fused.
The connection strength after connection was 50 to 70 N, and sufficient strength was developed. Further, the flexibility of the connecting portion was not greatly impaired, and the outer diameter smoothly passed through the 2.5 mm hole, and the stability of the manufacturing process was not lowered during the production of the hollow fiber membrane.

<Example 3>
As shown in FIG. 2, the hollow porous body 1 has a hollow braid (material PET) having an outer diameter of 2.4 mm, an inner diameter of 1.2 mm, and a striking number of 16 and the core material 3 has a PVDF fiber having an outer diameter of 0.88 mm. It was used. First, both hollow porous bodies 1 to be connected were melted and cut with a red hot nichrome wire having a diameter of 0.28 mm, and the core material 3 was cut to a length of about 90 mm with scissors. Next, the core material 3 was inserted into the hollow portion of the hollow porous body 1 so that the insertion lengths were substantially equal, and the cut surfaces of both hollow porous bodies 1 were brought together.

Next, a jig having a width of 2.1 mm and a depth of 3.05 mm and having an R-shaped groove was prepared, and a connecting portion of the hollow porous body was fixed thereto. The horn that generates an ultrasonic wave with an output of 35 W and an oscillation frequency of 40 kHz has a comb-like shape in which four squares with a tip of 0.4 mm × 0.4 mm are arranged linearly at a pitch of 1.7 mm. From the outer periphery of the hollow porous body 1 in which 3 was inserted, oscillation was performed at four locations at 2.5 seconds / time, and the hollow porous body 1 and the core material 3 of the fused portion 4 were fused.
The connection strength after connection was 50 to 70 N, and sufficient strength was developed. Further, the flexibility of the connecting portion was not greatly impaired, and the outer diameter smoothly passed through the 2.5 mm hole, and the stability of the manufacturing process was not lowered during the production of the hollow fiber membrane.

<Example 4>
As shown in FIG. 3, the hollow porous body 1 has a hollow braid (material PET) having an outer diameter of 2.4 mm, an inner diameter of 1.2 mm, and a batting number of 16 and the core material 3 has a PVDF fiber having an outer diameter of 0.88 mm. It was used. First, both hollow porous bodies 1 to be connected were melted and cut with a red hot nichrome wire having a diameter of 0.28 mm, and the core material 3 was cut to a length of about 150 mm with scissors. Next, the core material 3 was inserted into the hollow portion of the hollow porous body 1 by about 60 mm to 90 mm, and the cut surfaces of both hollow porous bodies 1 were brought together.

Next, a jig with a semicircular groove with a width of 2.4 mm, a length of 45 mm, a total groove depth of 3.2 mm and a radius of R1.2 mm is prepared on the surface of a smooth plate having a length of 45 mm. And the connection part of the hollow porous body 1 was fixed to the groove | channel. Thereafter, an ultrasonic horn having a concave semicircular groove with a distal end width of 2.2 mm, a length of 40 mm, a total groove depth of 0.7 mm on the distal end surface, and a radius R1 mm at the groove bottom, has a maximum output of 300 W. It was attached to an ultrasonic welder with an oscillation frequency of 28.5 kHz.
An ultrasonic horn with a thrust of about 210 N to 280 N from the outer periphery of the hollow porous body 1 in which the core material 3 is inserted, with an amplitude of 100% and a transmission time of 0.6 seconds to 0.8 seconds. The hollow porous body 1 and the core material 3 were fused.
The connection strength after connection was about 70 to 180 N, and sufficient strength was expressed. Further, the flexibility of the connecting portion was not greatly impaired, and the outer diameter smoothly passed through the 2.5 mm hole, and the stability of the manufacturing process was not lowered during the production of the hollow fiber membrane.

<Comparative example>
As a hollow porous body, a hollow braid (material PET) having an outer diameter of 2.4 mm, an inner diameter of 1.2 mm, and a striking number of 16 is used. After cutting both hollow braids with scissors, the two are overlapped with a heat sealer. Both were fused by heating.
The outer diameter after connection was caught by a hole of 2.5 mm, and the manufacturing process became unstable during the production of the hollow fiber membrane.

It is a schematic half cross section figure of an example which shows the connection part of a hollow porous body. The right side of the wavy line around the center is a cross-sectional view. It is a schematic half cross section figure of an example which shows the connection part of a hollow porous body. The right side of the wavy line around the center is a cross-sectional view. It is a schematic half cross section figure of an example which shows the connection part of a hollow porous body. The right side of the wavy line around the center is a cross-sectional view.

Explanation of symbols

1: Hollow porous body 2: Winding yarn 3: Core material 4: Fused part

Claims (7)

When connecting a plurality of hollow porous body, inserting the ends of the core in the hollow portion of both the hollow porous body connecting method for connecting hollow porous body to fix the hollow porous body and the core member met And
Connecting a hollow porous body that fixes the hollow porous body and the core material by winding a thread around the insertion portion outer periphery of the hollow porous body with the core material inserted in the hollow portion to cause a diameter change of the hollow porous body Method.   The method for connecting hollow porous bodies according to claim 1, wherein the hollow porous body is a hollow fiber membrane or a support for hollow fiber membranes. The method for connecting hollow porous bodies according to claim 2 , wherein the hollow fiber membrane support is a hollow braid or braid. When connecting a plurality of hollow porous body, inserting the ends of the core in the hollow portion of both the hollow porous body connecting method for connecting hollow porous body to fix the hollow porous body and the core member met And
A method for connecting hollow porous bodies, wherein the hollow porous body is a hollow fiber membrane support, which is a hollow braid or braid. The method for connecting hollow porous bodies according to any one of claims 1 to 4, wherein a single or a combination of frictional force, fusion, adhesion, and anchor effect is used for fixing the hollow porous body and the core material. The hollow porous body according to any one of claims 1 to 5 , wherein the hollow porous body and the core material are fused and fixed by ultrasonic waves from the outer periphery of the insertion portion of the hollow porous body in which the core material is inserted into the hollow portion. Connection method. Advance before connection of the hollow porous material, at the same time cutting the hollow porous material or the core material by heating wire heated by energization, any of claims 1 to 6, characterized in that integrally processed to melt the cut surface A method for connecting a hollow porous material according to claim 1.

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