KR20120051762A - Method of manufacturing hollow continuous body - Google Patents

Abstract

A method for producing a hollow continuous body in which a pair of hollow articles are arranged so that their ends contact each other or each end is in contact with one connecting member at its outer peripheral surface, and then the entire ends are compressed and deformed and joined. It is about.

Description

Method for producing hollow continuum {METHOD OF MANUFACTURING HOLLOW CONTINUOUS BODY}

This invention relates to the manufacturing method of a hollow continuous body used as a support body for hollow fiber membrane manufacture, a hollow fiber membrane, etc.

Recently, with increasing interest in environmental pollution, various regulatory laws on the environment have been strengthened, and countermeasures have been advanced in various fields. For example, in the field of water treatment, in order to highly isolate contaminants, treatment using a small filtration membrane has been studied.

By the way, when the filtration membrane is used for water treatment, high mechanical properties (for example, pressure resistance, tensile strength, etc.) are required. As a method of manufacturing the porous filtration membrane excellent in mechanical strength, the manufacturing method of the hollow fiber membrane using the hollow round braid as a hollow fiber membrane support body is proposed (refer patent document 1, 2, 3). In this manufacturing method, specifically, the support body for hollow fiber membrane manufacture is sent out from the center hole of an annular nozzle, and the film forming undiluted | stock solution discharged from the outer periphery of the annular nozzle is apply | coated to the outer periphery of the support body for hollow fiber membrane manufacture, and it solidifies to obtain a hollow fiber membrane.

In the above production method, in order to obtain a long hollow fiber membrane, a support for producing a hollow fiber membrane is also required to be long. Usually, since the length of the support for preparing a hollow fiber membrane is shorter than a desired length of the hollow fiber membrane, a plurality of supports must be joined.

In the manufacturing process of the hollow fiber membrane, there is a passage portion close to the outer diameter of the hollow fiber membrane during the passage process and closed like a pipe. For this reason, when the continuous body made by connecting support bodies for hollow fiber membrane manufacture etc. is used, since the outer diameter of a junction part becomes larger than another part, it will become difficult to pass a process, making a hollow fiber membrane run continuously.

As a method of joining support bodies for hollow fiber membrane manufacture, the method of using a well-known splicer is known, for example. However, in the joining method using a splicer, skilled technique is required, and therefore it is difficult to join the supports for hollow fiber membrane production appropriately, and when these are not joined properly, the joining strength is insufficient and the large diameter of the joining portion is insufficient. Problems occur. As a result, the junction part of the support body for hollow fiber membrane manufacture is clogged or caught by the center hole of an annular nozzle, and the stability of a manufacturing process is reduced.

By the way, about the joining method of a solid string, various methods are proposed so far. For example, Patent Document 4 proposes a method of joining string bodies by alternately forming heat-sealed portions and non-heat-sealed portions by overlapping or twisting plastic round strings in parallel and partially heating and pressing them at predetermined intervals.

However, when the bonding method described in Patent Document 4 is applied to a hollow material such as a support for producing a hollow fiber membrane, the heat-sealed portion is much smaller than the combined size of the two hollow bodies, and the non-heat-sealed portion is the size of the two hollow bodies combined. It becomes Therefore, in the joining method described in Patent Literature 4, a step is formed on the side surface after the joining, and when the obtained continuum is passed through a portion whose outer diameter is regulated such as the center hole of the annular nozzle, clogging or jamming occurs, and the manufacturing stability of the hollow fiber membrane is improved. Degrades.

In addition, a method has been proposed in which an elastic string is entangled, and then the noses are folded and overlapped to be fused by ultrasonic vibration or heating (see Patent Document 5). However, fusion | melting in patent document 5 does not join two string bodies, and obtains one continuum. In addition, since the object of fusion is a solid string, a step is formed in any part of the side surface after joining.

On the other hand, the method which inserts a core material in the hollow part of a hollow object, and ultrasonically fuses a core material and a hollow object is proposed (refer patent document 6). However, in the joining method in patent document 6, since it is necessary to join each of the edge parts in order to obtain desired joining strength, a joining part becomes long. In addition, since the core material is inserted into the hollow portion, the flexibility of the hollow substance at the joining portion is reduced. Such a decrease in the flexibility of the joining portion causes continuous running of the hollow article, and hence the followability to the guide during the rotational guide or the fixed guide run, which is used for changing the running direction or the like, causes a problem in the stable running of the hollow article. In particular, the longer the junction length is concerned that the effect is greater. It is also conceivable that the core material is separately required and the load in terms of cost and operability is increased.

Patent Document 1: Japanese Patent Laid-Open No. 52-81076 Patent Document 2: Japanese Patent Application Laid-Open No. 5-7746 Patent Document 3: International Publication No. 04/43579 Patent Document 4: Japanese Unexamined Patent Publication No. 50-4358 Patent Document 5: Japanese Patent No. 2962243 Patent Document 6: Japanese Patent Application Laid-Open No. 2008-105014

SUMMARY OF THE INVENTION An object of the present invention is to prevent problems such as lack of bonding strength and large diameter of the joining portion of a hollow product represented by a hollow fiber membrane manufacturing method support, and to prevent damage to the flexibility, without causing significant damage to the process at the time of hollow fiber membrane production or processing. It is to provide a method for producing a hollow continuous body, in which a decrease in stability is prevented.

The gist of the present invention is to arrange a pair of hollow articles so that their ends contact each other, or each end contacts one connecting member at its outer peripheral surface, and then compress and deform the whole of the ends to join them. It is in the manufacturing method of a hollow continuous body.

According to the method for producing a hollow continuous body of the present invention, it is possible to prevent problems such as lack of bonding strength and large diameter of the joined portion of the hollow body, and to improve process stability during hollow fiber membrane production or processing without significantly impairing flexibility. The hollow continuum in which the fall was prevented can be manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the connection device used by the example of one Embodiment of the manufacturing method of the hollow continuous body of this invention.
It is a figure which shows the state which inserted the hollow object adjacent to the connecting jig.
It is sectional drawing which shows the aspect which inserted the edge part of a pair of hollow object in the groove | channel of a connection jig | tool.
4 is a cross-sectional view showing an embodiment in which an end portion of a pair of hollow objects inserted into a groove is compressed and deformed by an ultrasonic horn.

The hollow article referred to in the present invention has a space portion that is continuous along the longitudinal direction, and is woven or knitted with a hollow fiber, a solid monofilament or a multifilament such that the inside is hollow, a sponge, The porous body etc. which have the same continuous or discontinuous space | gap part are mentioned, More specifically, a hollow fiber, a hollow braid, a hollow knitted string, a hollow fiber membrane, etc. are mentioned.

Although the shape of a hollow part is not specifically limited, A substantially circular one is preferable. The outer diameter of the hollow article is not particularly limited, but 0.5 to 5 mm is preferable. In addition, the inner diameter is preferably 0.2 to 4 mm. Further, the inner diameter is preferably determined so that the volume of the hollow portion of the hollow article is 10 to 90%, preferably 20 to 80% of the volume volume of the hollow article obtained from the outer diameter of the hollow article.

Although the material of a hollow substance is not specifically limited, It is preferable that fusion | melting is possible. Specific examples include polyethylene terephthalate, nylon, polyethylene, polypropylene, polyvinyl chloride, polysulfone, polyacrylonitrile, cellulose acetate, polyvinylidene fluoride, and the like. These may be used independently and may combine multiple.

The pair of hollow articles may contain the same material, may be different, or may be a combination of a plurality of these.

In this invention, a pair of hollow object is arrange | positioned so that the edge part may mutually contact each other or each edge part may contact one connection member in the outer peripheral surface.

When arranging a pair of hollow objects so that the end parts may mutually contact each other, although the length of the contact part in the thread length direction of a contact part is suitably determined according to desired joining strength and flexibility after joining, the obtained hollow continuum is repeated. In consideration of the stability and the like when used in accordance with the present invention, the ratio of (length A (mm) of the contact portion in the yarn length direction) / (outer diameter (mm) of any one of the outer diameters of the pair of hollow articles) is 1 It is preferable that it is above. When this ratio exceeds 30, the force required when deforming the hollow substance at the time of joining becomes large, and there exists a tendency for the apparatus for joining to enlarge.

In addition, the portion to which the hollow substance is joined is more rigid than other portions, and when the hollow continuum is run along a guide or the like, there is a fear that the joining portion is lifted from the guide surface and the hollow substance is separated from the guide.

Therefore, the length A of the contact portion, which later corresponds to the length of the bonded portion, is preferably in the range of 5 mm to 150 mm, more preferably 5 mm to 100 mm, most preferably 10 mm to 40 mm. By making the length of a contact part into the above-mentioned range, by joining this part, a high joining strength can be obtained and a hollow continuous body excellent also in flexibility can be obtained.

In the case where the hollow objects are brought into contact with each other, since the hollow continuous body having no step on the side can be easily manufactured, it is preferable that the hollow cores are brought into contact with each other so that the axis of the end of each hollow object is in the same straight line along the vertical direction. .

Hereinafter, the case where a pair of hollow objects are arrange | positioned so that each edge part may contact one connection member in the outer peripheral surface is demonstrated.

As a member for a connection, it is a member for joining hollow objects, It is preferable to be able to bond easily with a hollow object, and to be able to maintain the joining strength and flexibility required to stably pass a hollow fiber membrane manufacturing process and a processing process, Specifically, fiber bundles, hollow or solid braids, hollow or solid braids, belt-like articles of fiber knitted fabrics, porous rod-like articles, porous belt-like articles, and the like. Moreover, when joining by joining by compression deformation, in order to obtain the hollow continuous body which does not have a level difference on the side, it is preferable that the volume reduction rate at the time of compression deformation is large as a connection member, As such a connection member, a hollow fiber bundle and a hollow Braid, hollow knit string, hollow fiber membrane, hollow porous material, hollow net, tube and the like.

As a member for a connection, it is preferable to use the thing containing the same raw material as the hollow object to join in terms of a thermal characteristic, a property with respect to a chemical | medical agent, and the like.

The connecting member is arranged to contact each end of the pair of hollow articles with its outer peripheral surface.

In this case, since a contact part becomes a connection part, in order to connect effectively, it is preferable to take a contact surface large and to make it contact | adherently so that a gap may not arise as much as possible.

In this invention, after arrange | positioning a pair of hollow objects so that the edge part may mutually contact each other or each edge part contact | connects one connecting member at the outer peripheral surface, the end part is compression-deformed.

Although it does not specifically limit as a method of compressive deformation, For example, the method of giving a fixed load with a weight, an air cylinder, etc. is mentioned. In particular, in the case of using an air cylinder, the load applied by the increase or decrease of the supply air pressure can be changed, and the load and removal can be easily performed by inverting the cylinder supply direction of the supply air with a valve or the like.

In the present invention, after the end portion of the hollow article is subjected to compression deformation, the hollow articles or the hollow article and the joining member are joined.

As a method of joining, the method of joining by an adhesive agent and the method of joining by fusion are mentioned.

In the case of bonding with an adhesive, the method is not particularly limited. For example, after applying an appropriate amount of adhesive to the connection surfaces of the hollow objects or the hollow objects and the joining member, the adhesive is inserted into the connecting jig and subjected to compression deformation. The method of hardening an adhesive agent and joining in a desired shape, etc. are mentioned. Examples of the adhesive to be used include solvent evaporation type, hot melt type, reaction curing type and the like. Moreover, what is necessary is just to select an adhesive suitably according to desired conditions, such as connection time, flexibility, and connection strength. In addition, as adhesive amount used for joining, when compressing and deforming a joint part, adhesive agent fully penetrates into the joint surface of a hollow object or a hollow object, and a member for joining, and it flows out a large quantity from a joint surface, and adheres to a connection jig | tool. It is preferable to select the amount which is not enough in accordance with the porosity of a hollow object or a joining member. In addition, when an adhesive agent adheres and hardens on an inner surface of a connection jig, peelable surface treatment, for example, fluorine-type resin coating, may be performed so that an adhesive part and a connection jig may be easily separated.

In the case of joining by fusion, the method is not particularly limited. For example, a method of joining a heated connecting jig into direct contact with a hollow material and compressing and deforming it into a desired shape, or by using a non-heating connecting jig in advance. After compression-deformation, the method of contacting and contacting the heated connection jig and joining is mentioned. The heating temperature at that time is preferably about 250 ° C to 280 ° C which is a temperature near the melting point, for example, when the polyethylene terephthalate is fused. In addition, the fusion | melting in this invention means the state in which one part or all part which superimposed the edge part of a pair of hollow objects melt | dissolved. In addition, in the case of the case where the hollow bodies which melted at the time of fusion or the joining member are attached and cooled and solidified on the inner surface of the connecting jig, the peeling surface treatment is carried out so that the bonding portion and the connecting jig can be easily separated. When high, it is preferable to perform heat-resistant peelable surface treatment.

In the case of joining by fusion, the shape of the fusion is not fixed when the connecting jig or the like heated in the fusion state is removed. Therefore, it is necessary to cool the connecting jig once. In the case of fusion by ultrasonic, an ultrasonic horn is used for fusion. ), The connecting jig, and the like are non-heating and short-term treatment is most preferable. In addition, in the case of ultrasonic welding, since the temperature of a connection jig does not rise, the peelable surface treatment of the inner surface of a connection jig can use a normal fluorine-type resin coating.

Hereinafter, the manufacturing example at the time of ultrasonic welding is demonstrated concretely.

In the present production example, the ultrasonic horn 1 and the connecting jig 2 as shown in Figs. 1 and 2 are subjected to compression deformation so that the entire ends of the adjacent pair of hollow objects overlap each other. The provided connection device is used.

The ultrasonic horn 1 of this manufacturing example is a surface which the lower surface 1a contacts the hollow objects 3a and 3b, and transmits an ultrasonic wave from the lower surface to the hollow objects 3a and 3b.

The connection jig 2 of this manufacture example is a rectangular plate, The groove 2a is formed linearly from one side of the plate toward the side opposite to the side, The depth of the groove 2a is a pair of hollow The upper objects 3a and 3b can be stored repeatedly.

In the fusion | fusing using said ultrasonic horn 1 and the connection jig 2, as shown in FIG. 3, the edge part 3c, 3d of a hollow object is respectively inserted in the groove | channel 2a of the connection jig 2, Subsequently, as shown in FIG. 4, the front end of the ultrasonic horn 1 is inserted into the groove 2a, and the end portions 3c and 3d are pressed to the bottom of the groove 2a so that the adjacent hollows overlap the ends 3c and 3d. The ends 3c and 3d of the upper bodies 3a and 3b are subjected to compression deformation. Ultrasonic waves are delivered from the ultrasonic horn 1 to the ends 3c and 3d of the adjacent hollow objects 3a and 3b while being kept in the compression deformation state to be fused.

When the hollow objects 3a and 3b are fused to each other using the ultrasonic horn 1, localized heat generation by friction occurs at the contact portions of the hollow objects 3a and 3b, and the joined portion is thermally deformed or fused, Since the oxide film on the surface disappears and the interface is activated and intermolecularly bonded, the liquid evaporates or moves from the fusion interface even in a wet state in which a liquid such as water is present between the fibers of the hollow bodies 3a and 3b or in the porous portion. It becomes possible.

Since the process stability of the hollow continuous body obtained by this compression deformation becomes higher, the shape of the cross section perpendicular | vertical to the longitudinal direction of the part which overlapped the edge part of a pair of hollow objects after compression deformation (henceforth a cross-sectional shape), It is preferable to make it substantially the same as the cross-sectional shape of one hollow object before compression deformation, ie, to make it substantially circular shape.

In order to make the cross-sectional shape of the part which overlapped the edge part of a pair of hollow objects after compression deformation substantially the same as the cross-sectional shape of one hollow object before compression deformation, as shown in FIG. 1, for example, an ultrasonic horn ( As 1), the method in which the groove | channel formed in circular arc shape was formed in the lower surface 1a, and the method in which the U-shaped groove | channel 2a was formed as the connection jig 2 can be employ | adopted. When the ultrasonic horn 1 is inserted into the groove 2a of the connecting jig 2, a cavity having a substantially circular cross-sectional shape is formed.

In the case where the connecting jig 2 and the ultrasonic horn 1 are used, a small gap may occur between them, and a burr may be formed after ultrasonic welding. May occur.

By using the ultrasonic horn 1 and the connecting jig 2, the end portions 3c and 3d of the adjacent hollow objects 3a and 3b can be fused together at one time. By fusion | melting the edge part 3c, 3d of the adjacent hollow object 3a, 3b at once, a desired joint strength can be obtained more easily.

The thrust (surface pressure) and the ultrasonic wave oscillation time given in order to compressively deform the hollow body at the time of ultrasonic welding while compressing and deforming the ends of the hollow body are depending on the type of the ultrasonic horn, the type of the hollow body, the desired bonding strength and flexibility. This is a good choice.

In addition, the maximum output and the oscillation frequency in the ultrasonic welder for performing ultrasonic welding are not particularly limited as long as they can be fused, but commercially available welders in which the maximum output ranges from 30W to 2500W and the oscillation frequency ranges from 60kHz to 15.15kHz. What is necessary is just to select suitably according to joining conditions.

The thrust (surface pressure) applied in order to compressively deform the hollow article may be used as long as the desired thrust can be provided. For example, a weight, a spring, the method of attraction, the method of using air pressure, or hydraulic pressure are mentioned. Among them, the air cylinder using air pressure can be easily supplied by adjusting the pressure to a desired pressure using a commercially available compressor or the like using a commercially available compressor or the like. The air cylinder can be easily changed by changing the supply pressure, and can be suitably used because it can cope with various conditions. The thrust in this case can be calculated | required by the product of the cross section area calculated | required from the air cylinder diameter, and air cylinder supply pressure.

For example, using an ultrasonic welder with a maximum output of 300 W, an oscillation frequency of 28.5 kHz, and an air cylinder with a diameter of 32 mm, hollow braids (polyethylene terephthalate, 830 dtex-96 fil x 16 strokes) having an outer diameter of 2.5 mm and an inner diameter of 1.2 mm When joining in parallel by about 2.5 to 30 mm, the oscillation time is preferably about 0.4 to 2 seconds, and the thrust is about 50 to 400 N (the air cylinder supply pressure is about 0.06 MPa to 0.51 MPa).

As mentioned above, in the manufacturing method of this manufacturing example, since the edges of a pair of adjacent hollow objects are not deformed partially but the whole is compressively deformed so that the said ends overlap with each other, the joint strength lacks and large diameter of the joining part of a hollow object is squeezed. Problems, such as these, can be prevented and generation | occurrence | production of a level | step difference can be prevented from the side surface of the hollow continuous body obtained. This is because the space portion of the hollow object is compressed and deformed or reduced by ultrasonic welding.

Therefore, the hollow continuous body obtained becomes linear, and when it passes through the part whose outer diameter was regulated, it becomes difficult to become clogged or caught. In addition, since the flexibility is not significantly impaired, the running of the hollow article is stable, and a decrease in the process stability at the time of hollow fiber membrane production or processing is prevented.

Moreover, according to the manufacturing method of the hollow continuous body of the said manufacturing example, since joining time can be shortened and heating of an ultrasonic horn, a connection jig, etc. is unnecessary, fusion to these is prevented. Moreover, since ultrasonic fusion | melting is carried out, a hollow substance can be joined in the same conditions in any of a dry and a wet state. Therefore, a hollow continuous body can be manufactured efficiently.

The hollow continuous body obtained by said manufacturing method can be used suitably as a support body used when manufacturing a hollow fiber membrane.

As a specific method of manufacturing a hollow fiber membrane using a hollow continuum as a support body, a hollow continuum is sent out from the center hole of an annular nozzle, and the film forming undiluted | stock solution discharged from the outer periphery of the cyclic nozzle is apply | coated to the outer periphery of the said hollow continuum, And solidifying to form a continuum of hollow fiber membranes, and cutting this.

In addition, although the cross-sectional shape of the part which overlapped one end part of a pair of hollow objects after compression deformation was made into substantially circular shape, if the permeability of the part whose outer diameter was regulated was not impaired, a certain shape (for example, elliptical, triangular) , Square, etc.) may be sufficient.

Moreover, in this invention, the edge part of an adjacent pair of hollow objects can be divided | segmented into plural, and finally, the whole can also be fused. However, in that case, while a fusion | melting part heat-shrinks, a non-fusion | fusing part may expand and the running stability of the hollow continuous body obtained may be impaired. Further, since the subsequent fusion treatment acts on the end subjected to the first fusion treatment to become overmelt, the desired bonding strength may not be obtained. From these, it is preferable to fuse together the whole edge part of an adjacent pair of hollow objects similarly to the said embodiment.

<Examples>

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail based on an Example.

In addition, in the joining of a hollow object, the ultrasonic welder provided with the connection jig 2 and the ultrasonic horn 1 as shown in FIG. 1 and FIG. 2 was used.

[Connection jig]

The one in which the groove | channel 2a of 6.1 mm in which the depth C recessed in U shape was linearly formed was used.

[Ultrasound welder]

SONOPET 302S-G-M (maximum output 300W, oscillation frequency 28.5kHz) by Sedensha Denshi Kogyo Co., Ltd. was used.

As the ultrasonic horn 1, a tip width E of 2.2 mm and a length D of 40 mm were formed in the lower surface 1a, which is the pressing surface, in which an arcuate groove was formed along the longitudinal direction and moved vertically in the vertical direction. . Moreover, the ultrasonic horn 1 was provided so that the front-end | tip may enter the groove | channel 2a of the connection jig 2.

A low speed air cylinder was used for the vertical movement of the ultrasonic horn 1. The air cylinder is supplied with air whose pressure is adjusted by a pressure reducing valve and whose exhaust speed is adjusted by a low speed speed controller.

A stopper is provided so that the tip of the ultrasonic horn 1 stops immediately before the bottom of the groove 2a of the connecting jig 2, and the tip of the ultrasonic horn 1 and the bottom of the groove 2a of the connecting jig 2 are fixed. Contact was prevented.

(Examples 1 to 18)

The hollow article (A) (3a) and the hollow article (B) (3b) of the combination shown in Tables 1-3 were bonded together, and the continuum of the hollow article was obtained.

Specifically, the end part 3c of the hollow object A (3a) is inserted into the groove | channel 2a of the connection jig 2, and the end part 3d of the hollow object B (3b) is then Table 1- It inserted so that it might become parallel by parallel length A shown in Table 3. Subsequently, air is supplied to the air cylinder under the conditions shown in Tables 1 to 3 to lower the ultrasonic horn 1, and thrust (surface pressure) is applied to the hollow object (A) 3a and the hollow object (B) 3b. Walked.

And the whole of the edge part 3c, 3d of the adjacent hollow object (A) 3a and the hollow object (B) 3b is compressively deformed so that the edge part 3c, 3d may overlap each other (refer FIG. 4), In that state, ultrasonic waves were oscillated. Thereby, the hollow body (A) (3a) and the hollow body (B) (3b) were ultrasonically fused together, and the hollow continuous body was obtained. In Example 18, the needle of the syringe which can supply water is inserted into the hollow part from each edge part of the hollow substance A and B similar to Example 16, water is supplied to a hollow part by the pressurization pressure of 200 KPa, and a hollow substance It supplied until water came out from the outer surface of an edge part, and made the hollow object a wet state.

The joint strength of the joint part of the obtained hollow continuous body was measured as follows using the digital force gauge (ZP-500N) by the Corporation.

First, the hook which can hook on both ends of a hollow continuum was made, it hooked on the hook which fixed one ring, and the other hook was hooked on the hook of the digital force gauge. Subsequently, the tension movement direction of the digital force gauge was made to be substantially perpendicular or horizontal direction, the power supply of the digital force gauge was supplied, and zero reset of the display value was carried out in the state that tensile tension is not applied to a hollow continuous body. Then, it was pulled manually and the breaking load was measured using the peak hold function. The breaking load was measured twice, and the average value was obtained. The measurement results are shown in Tables 1-3.

In any of Examples 1-18, the breaking load of the joining part of the obtained hollow continuous body was all high enough. In addition, the cross-sectional shape of the junction part was substantially the same as the cross-sectional shape of the hollow object before compression deformation. Therefore, when the hollow continuous body obtained in Examples 1-11 was passed through the center hole of the annular nozzle, it passed smoothly without being caught by the joining part. Moreover, when the hollow continuous body obtained in Examples 12-18 was passed through the hollow fiber membrane manufacturing process, it passed smoothly, without being caught by a joint part similarly to Examples 1-11. Therefore, the fall of process stability in hollow fiber membrane manufacture was prevented.

Moreover, by comparing Example 16 and Example 18, it turned out that sufficient joining strength is expressed in both a dry type and a wet type hollow object to be bonded.

Industrial Applicability

The manufacturing method of this invention prevents problems, such as a lack of joining strength and large diameter of the joining part of a hollow object, and prevents the fall of process stability at the time of hollow fiber membrane manufacture or processing, without impairing a great flexibility, It is useful for the preparation of continuum.

1: ultrasonic horn
1a:
2: connecting jig
2a: home
3a, 3b: hollow material
3c, 3d: end
A: parallel length
B: width of groove
C: depth of groove
D: ultrasonic horn length
E: ultrasonic horn width
d1: hollow outer diameter
d2: hollow phase internal diameter

Claims (7)

A method for producing a hollow continuous body in which a pair of hollow articles are arranged so that their ends contact each other or each end is in contact with one connecting member at its outer peripheral surface, and then the entire ends are compressed and deformed and joined. . The manufacturing method of the hollow continuous body of Claim 1 which joins an edge part by fusion welding. The manufacturing method of the hollow continuous body of Claim 2 which joins an edge part by ultrasonic welding. The manufacturing method of the hollow continuous body of Claim 1 whose length in the yarn length direction of the joined part is 150 mm or less. The method for producing a hollow continuous body according to claim 1, wherein the hollow substance is any one or more selected from braid, knitted string, and hollow fiber membranes. The method for producing a hollow continuous body according to claim 1, wherein the connecting member is hollow. The manufacturing method of the hollow continuous body of Claim 6 in which the connection member contains the same raw material as a hollow object.

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