JP2012152717A - Method for manufacturing spiral type fluid separation element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a spiral type fluid separation element 1 in which telescope preventing plates 8 can be easily inserted into a center of water collecting tube 3 even in the case there is a fluctuation in a gap between the outer diameter size of the water collecting tube 3 and the inscribed diameter of the telescope preventing plates 8, a time for fixing the telescope preventing plates 8 to the water collecting pipe 3 can be remarkably shortened, and further the telescope preventing plates 8 can be inserted without damaging the water collecting pipe 3.SOLUTION: In the method for manufacturing the spiral type fluid separation element 1 constituted by arranging the telescope preventing plates 8 at both ends of a winding and surrounding body constituted by winding a plurality of separation membrane units 7 in a spiral shape around the water collecting pipe 3 having water collecting holes 2, resin 11 is arranged in advance such that there are parts where the resin 11 is not arranged between the arranged resin 11 in a bonding part of the telescope preventing plates 8 in the water collecting pipe 3, when the telescope preventing plates 8 is inserted in the water collecting pipe 3 and bonded with the separation membrane units 7.

Description

  The present invention is a fluid separation element that is used by loading a plurality of pressure vessels into a pressure vessel, and is used in a reverse osmosis device, an ultrafiltration device, a microfiltration device, and further a spiral type used in a gas separation device The present invention relates to a method for manufacturing a fluid separation element.

  In recent years, in various applications including seawater desalination, ultrapure water use in the semiconductor field, general brine use, organic matter separation, wastewater reuse, etc., fluid separation treatment using membranes and use of permeate To be done. In this separation process using a membrane, a spiral fluid separation element using a separation membrane is used, and its use is rapidly increasing.

  Generally, a spiral type fluid separation element is provided with a telescope prevention plate at each end of a wound body in which a plurality of separation membrane units are wound in a spiral shape around a water collection pipe having a water collection hole, It is a structure in which an exterior body made of fiber reinforced resin is attached to the outer periphery of the separation membrane unit.

  When fluid separation is actually performed using a spiral fluid separation element, a plurality of spiral fluid separation elements are connected in series and loaded into a pressure vessel to be used as a separation membrane module. In order to efficiently flow the supplied stock solution into the spiral fluid element, the gap between the pressure vessel and the telescope prevention plate is blocked by a stock solution mixing prevention member such as a U seal.

  Since the supplied stock solution flows from the telescope prevention plate into the separation membrane unit without leakage, it is used in a state where the telescope prevention plate and the separation membrane unit are in close contact with each other. As a prior art, it is known to apply and bond an adhesive to the inner peripheral surface of the telescope prevention plate and the outer peripheral portion of the water collecting pipe in order to bring the telescope prevention plate and the separation membrane unit into close contact (for example, Patent Document 1). reference).

Further, the outer diameter of the water collecting pipe is designed to be slightly smaller than the inscribed diameter of the telescope prevention plate so that the telescope prevention plate can be easily inserted, and this gap may vary in the manufacturing process. In consideration of such variations, the telescope prevention plate is inserted into the center of the water collection pipe without eccentricity. Therefore, there are inclined surfaces on the insertion side of the water collection pipe at three or more positions on the inner peripheral surface of the telescope prevention plate. And the method of forming the protrusion which can deform | transform when inserting a water collection pipe | tube with a larger outer diameter than an inscribed diameter is known. (For example, see Patent Document 2)
However, the conventional method using an adhesive requires a drying time of about 30 minutes to 120 minutes in order to fix the adhesive, and during that time, there is a problem that the process cannot be shifted to the next step. Further, in the method of forming a deformable protrusion on the inner peripheral surface of the telescope prevention plate, it takes a cost to newly manufacture a mold for molding the telescope prevention plate, and the hardness is equal or of the hardness. There was a risk of damaging the water collecting pipe when inserting the telescope prevention plate due to the close protrusion.

JP-A-11-165048 JP 2007-289830 A

  Therefore, the object of the present invention is to easily insert the telescope prevention plate into the center of the water collection pipe even when there is a variation in the gap between the outer diameter of the water collection pipe and the inscribed diameter of the telescope prevention plate. In addition, it provides a method for manufacturing a spiral fluid separation element that can significantly reduce the time until the telescope prevention plate is fixed to the water collecting pipe and that can be inserted without damaging the water collecting pipe. There is to do.

  In order to solve the above problems, the present invention provides a telescope prevention plate at each end of a wound body that surrounds a plurality of separation membrane units in a spiral shape around a water collection pipe having a water collection hole. In the spiral fluid separation element manufacturing method, when the telescope prevention plate is inserted into the water collecting pipe and joined to the separation membrane unit, the resin is disposed at the joint portion of the water collection pipe with the telescope prevention plate. It arrange | positions beforehand so that it may have a part where resin is not arrange | positioned between resin to be arranged. In the present invention, by providing a space between the arranged resins, when the telescope prevention plate is inserted, the pressure generated when the resin is crushed is blocked by the space and does not propagate to the neighboring resin. It is possible to suppress the resin peeling that tends to occur when the coating is applied on one surface.

  Further, in the manufacturing method of the present invention, before the telescope prevention plate is inserted, the resin is arranged so that the outer diameter of the water collecting pipe including the resin is larger than the inscribed diameter of the telescope prevention plate. It is preferable. For example, before the telescope prevention plate is inserted, resin is applied to the outer peripheral portion of the water collection pipe so that the outer diameter of the water collection pipe is larger than the inscribed diameter of the telescope prevention plate. When the telescope prevention plate is inserted, the resin is hardened, and the resin is fixed by being crushed between the inscribed surface of the telescope prevention plate and the outer peripheral portion of the water collecting pipe. .

  Resins that can be used here include ethylene vinyl acetate copolymer resin, polyester resin, polyamide resin, polyimide resin, vinyl acetate resin, acrylic resin, polyurethane resin, styrene / rubber resin, ether cellulose resin, etc. Thermosetting resins such as plastic resins, epoxy resins, silicone resins, and melamine resins are preferred. Acrylonitrile, butadiene, styrene copolymer resins, polyethylene resins, polypropylene resins, and noryl resins used for telescope prevention plates and water collection pipes. By using a material having a lower hardness than the above, there is no risk of damaging the telescope prevention plate or the water collecting pipe when the telescope prevention plate is inserted.

  Here, the hardness of the joint between the resin and the telescope prevention plate with the water collecting pipe and the joint with the telescope prevention plate in the water collection pipe is determined by measuring the Rockwell hardness in the Rockwell test (JISG 0202). Can be sought.

  Further, from the viewpoint of the curing time of the resin, a heat fusion method using a thermoplastic resin such as an ethylene vinyl acetate copolymer resin or a polyester resin is more preferable. When the above method is used, the curing time is about 3 to 10 seconds, which is shorter than that of the thermosetting resin, and the materials used are usually two types of the thermosetting resin, that is, the main agent and the curing agent. The fusing method is only resin and is easy to handle.

  In addition, these resins can be supplied in various shapes such as lump, pellet, flake, rod, cylinder, powder, string, film, etc. Can be reduced.

  Furthermore, when the telescope prevention plate is inserted, the surface of the resin cured by frictional heat is softened, and it is possible to reinforce the fixation of the telescope prevention plate and the water collecting pipe with adhesive force again.

  These resins are preferably arranged in a dot shape, a stripe shape, or a wave shape when arranged in the water collecting pipe.

  At this time, it is preferable to apply the resin by using a spraying device while rotating the water collecting pipe side at a constant speed so that the water can be arranged uniformly.

  As another means, when the resin is disposed in the water collecting pipe, thermal transfer may be performed using a release sheet and a heating device to which the resin has been applied in advance. It is preferable that the release sheet is provided with a resin in any of dot shape, stripe shape, and wave shape.

  According to the present invention, when manufacturing a spiral type fluid separation element, even if there is a variation in the gap between the outer diameter of the water collecting pipe and the inscribed diameter of the telescope prevention plate, the telescope can be easily prevented at the center of the water collecting pipe. The plate can be inserted, and the time until the telescope prevention plate is fixed to the water collecting pipe can be greatly shortened. Further, the telescope prevention plate can be inserted without damaging the water collecting pipe.

It is a partial exploded perspective view showing one mode of spiral type fluid separation element concerning the present invention. It is a top view of the telescope prevention board which concerns on this invention. It is a perspective view of a water collection pipe concerning the present invention. It is a schematic diagram which shows sectional drawing of resin arrange | positioned at the water collection pipe | tube in the manufacturing method of the spiral type fluid separation element of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. A spiral fluid separation element 1 of the present invention includes a separation membrane 4, a permeate flow path around a water collection pipe 3 having a water collection hole 2, as shown in a perspective view of a partially exploded body of the spiral fluid separation element of FIG. 1. A plurality of separation membrane units 7 including a material 5 and a stock solution flow path material 6 are wound in a spiral shape, and telescope prevention plates 8 each having an annular portion are arranged at both ends of the wound body. An exterior body (not shown) made of fiber reinforced resin is attached to the outer periphery of the separation membrane unit 7.

  As shown in FIG. 2, the telescope prevention plate 8 has an inscribed portion 9 for insertion into the water collecting pipe 3, and the inscribed diameter thereof is usually 0.1 to less than the outer diameter of the water collecting pipe 3. 3.3mm larger.

  As a molding material for the telescope prevention plate 8 and the water collecting pipe 3, acrylonitrile / butadiene / styrene copolymer resin, polyethylene resin, polypropylene resin, noryl resin, or the like is used.

  The application range of the resin 11 is preferably the entire contact surface between the telescope prevention plate 8 and the water collecting pipe 3 as shown in FIG. However, in the present invention, the resin 11 needs to be arranged so as to have a portion where the resin 11 is not arranged between the arranged resins 11. In addition, it is more preferable to arrange the resin so that the height of the resin 11 gradually increases from the insertion side of the telescope prevention plate 8 toward the separation membrane unit 7.

  As shown in FIG. 4, the resin 11 is preferably arranged in a pattern of (a) dots, (b) stripes, or (c) waves. For example, in the case of (a) dots, the dot height A houndstooth shape having a dot diameter of 0.1 mm to 5.0 mm and a dot interval of 0.2 mm to 20.0 mm is preferable. More preferably, the dot height is 0.08 mm or more and 0.35 mm or less, the dot diameter is 2.0 mm or more and 4.0 mm or less, and the dot interval is 5.0 mm or more and 15.0 mm or less.

  As described above, the resin 11 is preferably a thermoplastic resin, and more preferably an ethylene vinyl acetate copolymer resin or a polyester resin from the viewpoint of processability and cost.

  Further, before the telescope prevention plate 8 insertion step, a heating and melting device for heating and melting the resin 11 and a spraying device are arranged, and the water collecting tube is rotated at a constant speed around the water collecting tube 3 of the spiral fluid separation element 1. 3 can be applied in a predetermined arrangement pattern.

  In addition, in the insertion process of the telescope prevention plate 8, the method of inserting so that the telescope prevention plate 8 may be pushed into the water collection pipe | tube 3 without rotating may be preferable from the point that the arrangement pattern of the resin 11 may be destroyed. For the same reason, it is preferable that the contact portion of the telescope prevention plate 8 with the water collecting pipe 3 has no resistance such as a step as much as possible.

  When the telescope prevention plate 8 is inserted into the water collecting pipe 3 as described above, the resin 11 sandwiched between the two easily fixes the telescope prevention plate 8 and the water collection pipe 3 by frictional heat and crushing at the time of insertion. can do.

  Thus, the spiral type fluid separation element 1 of the present invention is manufactured. In the spiral type fluid separation element 1 of the present invention, the outer periphery of the surrounded separation membrane unit 7 is made of a fiber reinforced resin or the like. Covering with is also a preferred embodiment.

[Other Embodiments]
Hereinafter, other embodiments of the present invention will be described.

  In the above-described method, before the telescope prevention plate 8 is inserted, a heat melting device and a spray device for the resin 11 are arranged, and the water collection tube 3 is rotated while rotating at a constant speed around the water collection tube 3 of the spiral fluid separation element 1. Although the method of applying the resin 11 with the preset arrangement pattern is shown above, the resin 11 with the preset arrangement pattern applied to the release sheet may be thermally transferred to the water collecting pipe 3 with a heating roll or the like. Here, as the release sheet, a laminated resin sheet having a surface coated with a silicone coating can be preferably used.

  Compared with the above-described method, the heating and melting device and the spraying device for the resin 11 are not required, and the space of the facility can be saved.

  Further, the arrangement pattern may be other forms as long as the resin 11 can be arranged in the water collecting pipe 3, even if it is not in the form of dots, stripes, or waves.

DESCRIPTION OF SYMBOLS 1 Spiral type fluid separation element 2 Water collecting hole 3 Water collecting pipe 4 Separation membrane 5 Permeate flow path material 6 Stock solution flow path material 7 Separation membrane unit 8 Telescope prevention plate 9 Inscribed part 11 Resin

Claims (6)

  In a method for manufacturing a spiral fluid separation element, in which a telescope prevention plate is provided at each end of a wound body in which a plurality of separation membrane units are wound in a spiral shape around a water collection pipe having a water collection hole, When the telescope prevention plate is inserted into the water collection pipe and joined to the separation membrane unit, the resin is placed at the joint portion of the water collection pipe with the telescope prevention plate between the arranged resins. A method of manufacturing a spiral fluid separation element, wherein the spiral fluid separation element is disposed in advance.   2. The method for manufacturing a spiral fluid separation element according to claim 1, wherein the resin is disposed such that an outer diameter of the water collecting pipe including the resin is larger than an inscribed diameter of the telescope prevention plate.   The hardness of the resin is lower than the hardness of the joint portion with the water collecting pipe in the telescope prevention plate, and lower than the hardness of the joint portion with the telescope prevention plate in the water collection pipe. 3. A method for producing a spiral fluid separation element according to 2.   The method for manufacturing a spiral fluid separation element according to any one of claims 1 to 3, wherein the resin is disposed in a dot shape, a stripe shape, or a wave shape.   The method for manufacturing a spiral fluid separation element according to any one of claims 1 to 4, wherein a heating and melting device and a spraying device are used when arranging the resin.   The method for producing a spiral fluid separation element according to any one of claims 1 to 4, wherein, when the resin is disposed, thermal transfer is performed using a release sheet and a heating device to which the resin has been applied in advance.

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