JP2003010650A - Method and apparatus for producing fluid separation membrane element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for producing a fluid separation membrane element whereby a laminate such as a separation membrane can be uniformly wound in a roll without forming wrinkles in the inner layer part of the roll. SOLUTION: There are provided a method and an apparatus wherein a fluid separation membrane element 10 is formed by winding a laminate 2 prepared by alternatingly laying a separation membrane unit composed of separation membranes between which a raw fluid flow passage is disposed with a permeate flow passage material around a water collection pipe 1. The method and the apparatus are characterized in that the torque at which the laminate 2 is wound around the pipe 1 is constant or decreasing from the beginning of winding to the end of winding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a fluid separation membrane element, and more particularly to a fluid separation membrane element for preventing a wrinkle from being generated in an inner layer portion around which a laminate such as a separation membrane is wound. Manufacturing method and device.

[0002]

2. Description of the Related Art Generally, a spiral type fluid separation membrane element using a reverse osmosis membrane forms a separation membrane unit by sandwiching a raw material flow path material between separation membranes, and the separation membrane unit and a sheet-like permeation liquid. It is formed by spirally winding a laminated material in which flow path materials are alternately stacked around a water collecting pipe in a roll shape of a plurality of layers. When the raw water to be treated is pressed into the fluid separation membrane element from the part of the raw material flow passage material, the permeated water filtered by the separation membrane leaches out to the permeate flow passage material side, and further into the permeate flow passage material. It is collected along the water collection pipe.

Conventionally, when the above-mentioned fluid separation membrane element is manufactured, a laminated material on which separation membranes and the like are stacked is wound around a water collecting pipe while maintaining a constant tension. However, according to this conventional manufacturing method, the winding tension of the laminated material is constant from the start of winding to the end of winding.
As shown in, the winding torque gradually increased as the winding diameter increased due to the winding of the laminated material. Therefore, the inner layer portion of the laminated material wound in a roll shape is gradually tightened, and as a result, wrinkles are generated in the inner layer portion, which causes reduction in filtration efficiency.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to manufacture a fluid separation membrane element which allows a laminated body such as a separation membrane to be wound up uniformly without wrinkling in the inner layer portion wound in a roll shape. A method and apparatus are provided.

[0005]

A method for manufacturing a fluid separation membrane element of the present invention that achieves the above object is such that a separation membrane unit in which a stock solution flow path material is disposed between a separation membrane and a permeate flow path material are alternated. A method for producing a fluid separation membrane element, comprising forming a fluid separation membrane element by winding a laminated body laminated on a water collecting pipe around a water collecting pipe, wherein a winding torque of the laminated body around the water collecting pipe is wound from the beginning. It is characterized in that the winding is performed so as to be constant or taper to the end.

Further, in the apparatus for producing a fluid separation membrane element of the present invention, a laminated body in which a separation membrane unit in which a stock solution flow passage material is disposed between separation membranes and a permeate flow passage material are alternately stacked is used as a water collection pipe. A device for manufacturing a fluid separation membrane element, which is provided with a winding means for winding a roll around the circumference, wherein a winding torque for the water collecting pipe of the laminate is fixed to the winding means from the beginning to the end of winding. Alternatively, it is characterized in that a torque control means for gradually decreasing it is provided.

When the winding torque of the laminated body around the water collecting pipe is made constant from the beginning of winding to the end of winding as described above, the winding tension gradually decreases as the winding diameter increases, as shown in FIG. The tightening force for the inner layer portion of the laminated body wound in a roll shape is kept substantially constant throughout the time so that wrinkles and breaks do not occur in the inner layer portion. If the winding torque is gradually reduced from the beginning to the end of winding,
As shown in Fig. 5, the winding tension gradually decreases as the winding diameter increases, and the tightening force for the inner layer portion of the laminated body wound in a roll shape is made substantially constant in the initial stage of winding and gradually decreases in the latter period of winding. Make sure that the inner layer does not wrinkle or crumble. Therefore, the filtration efficiency of the fluid separation membrane element can be favorably maintained.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the constant wrapping torque includes a wrapping torque that varies within a range of ± 20% from the set value at the start of winding. Further, to gradually reduce the winding torque means to reduce the winding torque within the maximum range of 80% of the winding torque at the beginning of winding at the end of winding. It is preferable to reduce the winding torque to 10 to 50% of the winding torque at the start of winding. By constantly or gradually reducing the winding torque of the laminate from the start to the end of winding in such a range, the tightening force for the inner layer portion is constantly or gradually reduced as described above, and wrinkles or wrinkles are formed in the inner layer portion. Try not to generate it.

The winding torque is controlled by gradually reducing the pressing force of the pressing roll that is in contact with the opposite side of the drive roll when the laminated body is wound around the water collection pipe while the surface is being driven by the drive roll, or by supporting the water collection pipe. This can be done by applying a brake to the shaft and gradually reducing the braking force, or by sandwiching the leaf end of the laminate with a nip roll or the like and applying tensile tension to the laminate being wound.

Further, the water collecting pipe is attached to the drive shaft, the laminated body is wound while the surface of the laminated body wound in a roll shape is brought into contact with the brake roll, and the braking force of the brake roll is gradually reduced from the beginning to the end of winding. Can be done by

Although depending on the size of the fluid separation membrane element, as described above, the pressing force by the pressing roll for constant or gradually reducing the winding torque is in the range of 1 to 20 kgf, and the braking force is 1 to 50 kgf. And the holding pressure of the nip rolls is preferably in the range of 10 to 200 kgf.

When the water collecting pipe is mounted on the spindle and the laminated body is wound while directly driving the shaft, the driving torque of the drive motor of the spindle may be made constant or gradually reduced from the winding start to the winding end. .

In the present invention, the winding torque means the torque applied to the drive shaft of the drive roll when the drive roll is surface-driven, and the drive shaft is loaded when the water collecting pipe is axially driven. Refers to torque. The winding tension refers to the tension applied to the outermost layer of the laminated body which is being wound into a roll.

1A, 1B to 3A, 3B
10 and 10 respectively show a method and an apparatus for producing a fluid separation membrane element according to the present invention, but before explaining them, first, a laminated body wound around a water collecting pipe will be explained.

The laminate used in the present invention is constructed by alternately stacking a separation membrane unit in which a stock solution flow channel material is disposed between two folded separation membranes and a sheet-shaped permeate flow channel material. . This laminate may be prepared manually or by an automatic process (for example, JP-A-11-22636).
The automatic process disclosed in Japanese Patent No. 6) or the like may be used. A reverse osmosis membrane such as a cross-linked aromatic polyamide composite membrane is used for the separation membrane used in the laminate, and a raw material flow passage material and a permeate flow passage material are made of resin filaments such as polyethylene and polypropylene. A knitted net material is used.

As shown in FIG. 4, a separation membrane unit 22 for forming a laminated body has a stock solution channel material 21 superposed on the upper surface of a sheet-shaped separation membrane 20 which is spread on a flat surface, on a substantially half surface thereof. Then, the remaining half surface is formed so as to be folded back on the stock solution flow path material 21. At the bent portion of the separation membrane 20, the ends of the stock solution flow path members 21 may be welded 23 by an ultrasonic welder or the like to be joined to each other.

Separation membrane unit 22 formed as described above
On the other hand, as shown in FIGS. 5 (A) and 5 (B), the permeated liquid flow path members 24 are stacked, and this is alternately repeated a plurality of times,
The laminated body 2 as shown in FIG. 6 is formed. Separation membrane unit 22
The number of times of alternately stacking the permeate liquid flow path member 24 and the permeate liquid flow path member 24 is not particularly limited, but is 4 to 4 depending on the scale of the fluid separation membrane element.
36 times is preferable. The laminated body 2 thus formed is
Then, the water collecting pipe 1 having the water collecting holes 1a is spirally wound around the water collecting pipe 1 to form a roll-shaped fluid separation membrane element 10.

Since the laminated body 2 is wound around the water collecting pipe 1, in the laminated body 2, the permeated liquid flow path members 24 of the lowermost layer and the uppermost layer are made longer than the permeated liquid flow path member 24 of the intermediate layer, and the maximum The inner ends of the permeate flow path members 24 of the upper layer and the intermediate layer are respectively attached to the end portions of the permeate flow path member 24 of the lowermost layer by the adhesive tape 2
It is recommended to fix it with 6 (see FIG. 6). Further, when the laminated body 2 is formed as described above, the adhesive W is applied to the permeated liquid channel material 24 in a U-shape (see FIG. 5), and the permeated liquid channel material 24 is applied to the adhesive W. When it is bonded to the separation membrane unit 22 via, it becomes a bag shape with three sides closed, and an opening portion may be formed on the half-folded side of the separation membrane 20. The permeated liquid flow path material 24 allows the permeated water to flow toward the water collecting pipe 1 by such adhesion forming a bag shape.

According to the present invention, since the above-mentioned laminated body is wound around the water collecting pipe to form the fluid separation membrane element, as shown in FIG.
(B) to FIG. 3 (A), (B) or as illustrated in FIG.

In the embodiment shown in FIGS. 1A and 1B,
Reference numeral 1 is a water collecting pipe having a large number of water collecting holes 1a penetrating the surface thereof, 2 is the above-mentioned laminated body, 3 is a driving roll for driving the surface, and 4 is a pair of pressing rolls. The water collection pipe 1 is mounted on a spindle 5s that is horizontally rotatably supported by an end portion of a support arm 5 that can swing about a fulcrum 5p, and the support arm 5
It is able to move up and down with the rocking of.

As described above, the spindle 5 of the support arm 5
After adhering the end portion of the laminated body 2 to the surface of the water collecting pipe 1 supported by s, the surface of the laminated body 2 is driven by the driving roll 3 and the opposite surface of the water collecting pipe 1 is rolled. Is continuously wound while being pressed toward the drive roll 3 side by a pair of pressing rolls 4 and 4 to form a roll-shaped fluid separation membrane element 10. The pressing force of the pressing roll 4 at this time is urged by the cylinder 4a.

In the method of the present invention, when the laminated body 2 is continuously wound around the water collecting pipe 1 as described above, the controller 7 controls the amount of hydraulic oil supplied to the cylinder 4a to open the adjusting valve 6. The pressing force of the pressing roll 4 is gradually reduced from the winding start to the winding end of the laminated body 2 by adjusting the degree. By gradually controlling the pressing force of the pressing roll, the winding torque of the laminated body 2 around the water collecting pipe 1 is made constant from the beginning of winding to the end of winding as shown in FIG. 7, or as shown in FIG. Gradually reduce.

The laminated body 2 is controlled by controlling the winding torque.
Winding tension, that is, from the driving roll 3 to the pressing roll 4
The winding tension generated during the period gradually decreases as the winding diameter of the laminated body 2 increases (see FIGS. 7 and 8). Therefore, when the laminated body 2 is wound in a roll shape, the tightening force for the inner layer portion is substantially constant from the initial winding period to the latter winding period when the winding torque is constant, and the winding torque is gradually reduced. When it does, the initial winding is almost constant, and gradually decreases in the latter winding. Therefore, the winding tightening force does not increase with respect to the inner layer portion, so that the inner layer portion does not wrinkle or collapse, and the fluid separation membrane element 10 that is evenly wound is formed.

As a method of controlling the winding torque of the laminated body 2 around the water collecting pipe 1 as described above, a brake (brake drum or the like) is attached to the spindle 5s on which the water collecting pipe 1 is mounted, and the brake is applied to the water collecting pipe 1 by this brake. The force may be controlled to be gradually reduced from the start of winding to the end of winding. Further, as in the embodiment shown in FIG. 2, the leaf end of the laminated body 2 wound around the water collection pipe 1 is sandwiched by the nip rolls 8 and 8 to give a tensile tension, and the tensile tension is applied to the nip rolls 8 and 8 by a clamping pressure. May be controlled so as to gradually decrease from the start of winding to the end of winding. The clamping pressure is controlled by controlling the amount of hydraulic oil supplied to the cylinder 8a by the control unit 7a.
Can be done by.

FIG. 3 shows still another embodiment of the present invention.
In this embodiment, the water collection pipe 1 is attached to the spindle 11a, and the spindle 11a is driven by the drive motor 11. That is, the water collecting pipe 1 is directly axially driven to continuously wind the laminated body 2 around the water collecting pipe 1, and the leaf end of the laminated body 2 is gripped by the nip rolls 9 and 9 to apply a winding tension. To do. In this way, when the laminated body 2 is wound around the water collection pipe 1, the drive torque (winding torque) of the drive motor 11 is constant from the beginning to the end of winding as shown in FIG. 7 or as shown in FIG. By gradually decreasing, the winding tension of the laminate 2 is gradually decreased.

Therefore, also in this embodiment, as in the embodiment shown in FIGS. 1 and 2, the tightening force for the inner layer portion of the fluid separation membrane element is not increased,
It is possible to form the fluid separation membrane element 10 that does not cause wrinkles or collapse in the inner layer portion.

FIG. 10 shows still another embodiment of the present invention. In this embodiment, the water collection pipe 1 is connected to the spindle 11
It is mounted on a and its spindle 11a is driven by a drive motor (not shown). Reference numeral 4 is a pressing roll, and 30 is a brake roll. By rotating the laminated body 2 while keeping the surface of the laminated body 2 wound around the water collecting pipe 1 in contact with the surface of the brake roll 30, and gradually decreasing the braking force of the brake roll 30 from the winding start to the winding end, the spindle 11a The driving torque of is constant or gradually reduced from the beginning to the end of winding.

[0028]

As described above, according to the present invention, the winding torque for the water collecting pipe of the laminated body is made constant from the beginning of winding to the end of winding, or is gradually reduced. As the winding tension increases, the winding tension gradually decreases, and the winding force does not increase in the inner layer as in the case of conventional winding with a constant winding tension, and fluid separation that does not cause wrinkles or wrinkles in the inner layer Membrane elements can be formed. As a result, the filtration efficiency of the fluid separation membrane element can be improved.

[Brief description of drawings]

1A and 1B are a schematic side view and a plan view illustrating an apparatus for carrying out a method for manufacturing a fluid separation membrane element according to the present invention.

FIGS. 2A and 2B are a schematic side view and a plan view illustrating an apparatus according to another embodiment of the present invention.

FIGS. 3A and 3B are a schematic side view and a plan view illustrating an apparatus according to still another embodiment of the present invention.

FIG. 4 is an explanatory view illustrating a method for forming a separation membrane unit that constitutes a laminate used in the present invention.

5 is an explanatory view showing an example of stacking the separation membrane unit and the permeate flow path member of FIG.

FIG. 6 is an explanatory view showing an initial state in which the laminated body is wound around the water collecting pipe.

FIG. 7 is a graph showing an example of the relationship between the winding diameter and the torque / tension when the laminated body is wound around the water collecting pipe according to the present invention.

FIG. 8 is a graph showing another example of the relationship between the winding diameter and the torque / tension when the laminated body is wound around the water collecting pipe according to the present invention.

FIG. 9 is a graph showing the relationship between the winding diameter and the torque / tension when the laminated body is wound around the water collecting pipe by the conventional method.

FIG. 10 is a schematic side view illustrating an apparatus according to yet another embodiment of the present invention.

[Explanation of symbols]

1 water collection pipe 1a Water collection hole 2 laminate 20 separation membrane 21 Undiluted solution flow path material 22 Separation membrane unit 24 Permeate flow channel material 3 drive roll 4 pressure roll 6 adjusting valve 7, 7a, 7b Control unit 8,9 Nip roll 10 Fluid separation membrane element 11 Drive motor 11a spindle

Claims (10)

[Claims] 1. A fluid separation membrane element in which a laminated body in which a separation membrane unit in which a stock solution flow channel material is arranged between separation membranes and a permeate flow channel material are alternately stacked is wound around a water collecting pipe in a roll shape. A method of manufacturing a fluid separation membrane element for forming
A method for producing a fluid separation membrane element, wherein winding is performed so that the winding torque of the laminated body around the water collecting pipe is constant or gradually reduced from the beginning to the end of winding. 2. The laminate is wound while the surface of the roll-shaped laminate is brought into contact with a drive roll, and the opposite surface of the roll-like laminate is pressed toward the drive roll by a pressing roll. 2. The method for producing a fluid separation membrane element according to claim 1, wherein the fluid separation membrane element is rotated and the pressing force of the pressure roll or the braking force on the water collecting pipe is gradually reduced from the beginning to the end of winding. 3. The surface of the laminate wound in the form of a roll is brought into contact with a drive roll, and the opposite surface of the roll-shaped laminate is pressed toward the drive roll by a pressing roll, and The method for producing a fluid separation membrane element according to claim 1, wherein a tension is applied to the leaf ends to wind the laminate, and the tension is gradually reduced from the beginning to the end of winding. 4. The water collecting pipe is mounted on a drive shaft, and
The method for producing a fluid separation membrane element according to claim 1, wherein the drive torque of the drive shaft is constant or gradually reduced from the beginning to the end of winding. 5. The water collecting pipe is mounted on a drive shaft, the laminate is wound while the surface of the laminate wound in a roll shape is in contact with a brake roll, and the braking force of the brake roll is wound from the beginning to the end. The method for producing a fluid separation membrane element according to claim 1, which gradually decreases over time. 6. A winding means for winding a laminated body, in which a separation membrane unit in which a stock solution flow channel material is disposed between separation membranes and a permeate flow channel material, are alternately stacked around a water collecting pipe in a roll shape. A fluid separation membrane element manufacturing apparatus comprising: a fluid separation device, wherein the winding means is provided with torque control means for making the winding torque of the laminated body around the water collecting pipe constant or gradually decreasing from the winding start to the winding end. Membrane element manufacturing equipment. 7. The winding means brings the surface of the roll-shaped laminated body into contact with a drive roll, and presses the opposite surface of the roll-shaped laminated body toward the drive roll with a pressing roll. 7. The method according to claim 6, wherein the laminated body is of a surface drive type that is wound, while the torque control means performs control to gradually reduce the pressing force of the pressing roll or the braking force for the water collecting pipe from the beginning to the end of winding. Fluid separation membrane element manufacturing equipment. 8. The winding means brings the surface of the roll-shaped laminated body into contact with a drive roll, and presses the opposite surface of the roll-shaped laminated body toward the drive roll with a pressing roll. While comprising a surface drive type in which a tension is applied to the leaf end of the laminate to wind the laminate, the torque control means performs control to gradually reduce the tension tension from the beginning to the end of winding. An apparatus for producing the fluid separation membrane element described. 9. The winding means comprises a drive motor having a drive shaft on which the water collection pipe is mounted, and the torque control means keeps the drive torque of the drive shaft constant from the beginning to the end or gradually decreases. The apparatus for manufacturing a fluid separation membrane element according to claim 6, which controls to perform the following. 10. The winding means comprises a drive motor having a drive shaft on which the water collecting pipe is mounted, and the torque control means makes a drive torque of the drive shaft while being in contact with a surface of a laminate wound in a roll shape. The device for producing a fluid separation membrane element according to claim 6, further comprising a brake roll that performs a control of making the winding amount constant or gradually decreasing from the winding start to the winding end.