KR100624714B1 - Reverse osmosis frp vessel producted by filament winding molding method - Google Patents

Abstract

The present application relates to a molded rice method of the FRP pressure vessel produced by the FILAMENT WINDING molding method and articles of manufacture thereof.

More specifically, the present application relates to a pressure vessel made by the FILAMENT WINDING molding method listed below to provide a pressure vessel for reverse osmosis membrane filling and operating reverse osmosis membrane element in reverse osmosis treatment equipment which is a kind of industrial water treatment apparatus. will be.

The process of manufacturing the pressure vessel to be obtained in this order is summarized in order to prepare epoxy resin and non-woven glass fiber as raw materials, prepare a mold for mechanical mounting, apply a release agent to the MOLD surface and primary molding HAND LAY-UP process is carried out as follows, FILAMENT WINDING process is carried out as the secondary molding, and after hardening in the hardening furnace, demolding process is performed from MOLD, and cutting, tapping, and other processing processes are performed. Pressure test and quality inspection are provided to check whether the final product made through the product inspection and assembly process of each component such as END CAP is secured the desired properties in this application.

Pressure Vessel, Epoxy Resin, Non-Woven Fabric, Glass Fiber, Filtration Winding Molding

Description

Glass fiber reinforced plastic pressure vessel for reverse osmosis membrane made by filament winding molding method {reverse osmosis FRP vessel producted by filament winding molding method}

1 is a manufacturing process of the pressure vessel by the FILAMENT WINDING molding method.

2 is a perspective view of a pressure vessel to be obtained herein.

3 is an illustration of FILAMENT WINDING M / C

Figure 4 is an illustration of the mold and INNER LAYER molding used in the present application

5 is a structural diagram of a pressure vessel formed on the mold of the present application

6 is a structural diagram of a demolding machine used herein

7 is a diagram illustrating the fastening of the pressure vessel and the bolt after the mold demoulding

** Description of the symbols for the main parts of the drawings **

10: central axis 20: mold

30: inner layer 40: reinforced layer

50: demolding machine 51: hydraulic cylinder

52: winch 53: transfer bracket

54: demolding plate 55: connecting jack

60: FILAMENT WINDING M / C 61: roving grill

62: roving fiber yarn 63: primary guide roll

64: secondary guide roll 65: impregnation tank

66: EPOXY RESIN Raw Material 66: Induction Guide

70: pressure vessel center portion 80: pressure vessel outer portion

81: end plate fixing screw 82: tightening bolt

90: end plate 100: pressure vessel

In the manufacturing process of high-density ICs such as semiconductors, particularly high purity water is required. The technology for manufacturing ultrapure water for integrated circuit manufacturing has made rapid progress and growth with the introduction of film treatment technology.

The present application relates to a FRP pressure vessel produced by using a filament winding molding method of the pressure vessel used as a device for producing ultra pure water in the semiconductor industry.

Reverse osmosis (R / O) device for producing ultrapure water is affected by osmotic pressure, and RO device is usually operated at about 15 ~ 30 kg / ㎠. In this application, FRP is maintained at a pressure of 40 kg / ㎠ or more. To provide a pressure vessel.

In general, the FILAMENT WINDING pressure vessel, which is made of reinforcing fibers with high specific strength and non-rigidity such as glass fiber, kevlar and carbon fiber, and resin such as epoxy, has a weight of 40 ~ 60% and the same volume as the conventional metal pressure vessel. It can contain gases and has strong corrosion resistance.

In addition, in the aspect of failure, the FILAMENT WINDING pressure vessel has the characteristics of breakage stability because the FILAMENT WINDING pressure vessel has many breakdowns of internal fluid leakage.

Stainless steel, aluminum alloy and titanium alloy were used as general materials of high pressure pressure vessels. These metal pressure vessels usually have efficiency ratios of 7.6 ~ 15.2 × 10 ⁶ mm in terms of structural efficiency. WINDING FRP pressure vessels have an efficiency ratio of 12.3 ~ 30.5 × 10 ⁶ mm, much better than metal pressure vessels, depending on the liner and the type of reinforcing fibers used.

Since the FILAMENT WINDING structure is directional, it is difficult to apply the principles applied to structures made of isotropic materials such as metal or plastic.

In general, the FILAMENT WINDING structure increases the strain when subjected to high stress due to internal pressure, causing resin cracks between the fiber and the fiber to leak, so that the internal fluid leaks. COATING treatment is used.

The liner used is metal liner such as aluminum or stainless steel and ELASTOMER liner such as rubber.For low pressure vessels, the stress applied to the fiber by the internal pressure of the pressure vessel is only about 10% of the fiber strength. Since the elongation rate is small, cracking of the resin does not occur under the working pressure.

Since there is no need for LINER in these pressure vessels, the inside of GEL COATING, which makes a thin resin layer inside, prevents the fluid penetration inside, and ELASTOMER LINER like BUTYL RUBBER has good STRAIN characteristics at room temperature and high temperature. Used for pressure vessels.

When ELASTOMER LINER is used for high pressure and low temperature, ELASTOMER shows brittleness at low temperature and it is not suitable to use because it does not prevent gas penetration at high pressure. This is because a blister is formed between the layer and the elastomer.

In order to provide the pressure vessel used for the operation of the reverse osmosis membrane facility in consideration of the various conditions of the FILAMENT WINDING molding method, this product is manufactured by FILAMENT WINDING method using raw materials such as EPOXY RESIN and glass fiber, but without LINER inside. It is to provide a molding method of FRP pressure vessel that can withstand light and high pressure without COATING.

The present invention is a method for producing a FRP pressure vessel using the FILAMENT WINDING molding method, preparing a resin resin, non-woven fabric, glass fiber as raw materials, preparing a MOLD for mechanical mounting, and applying a release agent to the MOLD side 1 Performs HAND LAY-UP process to wind the nonwoven fabric on the surface of MOLD by secondary molding, performs FILAMENT WINDING process using glass fiber and resin as secondary molding, cures in curing furnace, demoulds from MOLD, and cuts Through the processing process such as & TAPPING, it is to provide the FRP pressure vessel through the product inspection and assembly process of each component such as HOUSING, BOLT, END CAP.

In addition, the pressure vessel produced by the above method is to provide a FRP pressure vessel having physical properties without physical deformation of the LEAK or pressure vessel of water for at least 10 minutes under the conditions of water pressure 40kg / cm ² .

The present invention is to provide a molding rice method of the FRP pressure vessel produced by the FILAMENT WINDING molding method.

More specifically, the present application is a molding method for forming a reverse pressure osmosis membrane element of a reverse osmosis facility, which is a kind of water treatment apparatus, to make a pressure winding molding method listed below for the purpose of providing a reverse osmosis operation. It is to provide a pressure vessel made by the molding method.

Our company manufactures MOLD using thick SEAMLESS PIPE without seam or seam, and then performs HAND LAY-UP process to wind nonwoven fabric on MOLD surface by primary molding, and glass fiber and resin by secondary molding. It is intended to obtain a pressure vessel manufactured through the FILAMENT WINDING operation, the pressure vessel is to provide a pressure vessel having a characteristic that does not cause the LEAK of water or physical deformation on the appearance of the product at a water pressure of 40kg / cm2.

Looking at the raw materials used in the present application, first of all, the resin of the used material (RESIN) intends to use EPOXY RESIN excellent in mechanical strength, and will be described below with reference to the embodiments of the present application and the technical configuration of the present application.

In the present embodiment, EPOXY RESIN is intended to be used as a raw material of resin, and EPOXY RESIN is intended to use a compressive strength of 1,290 kg / cm ² and a tensile strength of 1,220 kg / cm ² .

In addition, the material used for the INNER LAYER layer in the lamination process of the present application was a non-glass type, which was intended to use non-woven fabric or NEXUS VEIL of about 30 g / m ^2, and the STRUCTURE WALL ROVING for FILAMENT WINDING was treated with SILANE. 2200 TEX was used as TYPE "E" GLASS to impregnate with EPOXY RESIN.

In order to make the content ratio of GLASS FIBER and EPOXY RESIN and the total thickness uniform, the amount of raw material used to apply the molding standard of this application is GLASS FIBER (ROVING): RESIN content ratio as the weight ratio of about 7: 3 and the thickness of the pressure vessel 5. At 5 mm, the tolerance was adjusted to be within 10%.

Surface treatment of MOLD is treated with PVA (polyvinyl alcohol) and SILICONE, and air bubbles are removed by using rubber chisel because it causes the strength decrease, and the ratio of RESIN, hardener and accelerator is about 100: 80: 3 Special attention should be paid to mixing and mixing.In this application, the acid anhydride type was used as the high-temperature curing agent for EPOXY RESIN, and the accelerator used benzyl dimethyl dimethyl amine for EPOXY RESIN, and the ratio of RESIN, curing agent, and accelerator was 100%. If the ratio of: 80: 3 is not achieved, special attention should be paid to the mixing ratio and mixing as not only proper curing is achieved but also the strength of the product.

RO VESSEL, the pressure vessel to be manufactured here, should be uniformly smooth and have no flat distortion and maintain a flat surface. Therefore, no foreign substances should be mixed during the manufacturing process and there should be no exposure of GLASS FIBER. When installed and operated, it is appropriately performed without mixing the treated water and raw water when operating the RO element filled inside.

The present invention is a method of manufacturing a FRP pressure vessel using the FILAMENT WINDING molding method, preparing a resin and non-woven glass fiber as raw materials, to prepare a PIPE-type MOLD for mounting the machine, the release agent of PVA or SILICON on the MOLD surface HAND LAY-UP process is applied by primary molding and non-woven fabric is evenly wound on MOLD, and WINDING process by secondary molding is glass fiber immersed in EPOXY RESIN and WINDING by FILAMENT WINDING technique on primary molded MOLD. After hardening for 4 hours while maintaining 120 ℃ ~ 150 ℃ in the hardening furnace, perform demolding process from housing, go through additional processing such as cutting, tapping, etc. of each component such as HOUSING, BOLT, END CAP The product is inspected and assembled to provide a pressure vessel.

In addition, the pressure vessel of the present application is to provide a pressure vessel having a characteristic of no physical deformation or LEAK of water for at least 10 minutes under conditions of water pressure 40kg / cm ² .

The technical spirit of the present application will be described for each process with reference to the accompanying drawings in order to explain and explain the pressure vessel manufacturing process in more detail.

Figure 1 shows the manufacturing process of the pressure vessel by the FILAMENT WINDING molding method of the present application.

The pressure vessel manufacturing process shown in Figure 1 is a resin, non-woven fabric, glass fiber raw material, preparing a mold, a mold release step, a primary, secondary molding step, curing step, demolding step, processing step, product inspection step It is shown that the FRP pressure vessel can be provided through an assembly step, a test step such as a pressure test, a product packaging and a shipping step. Hereinafter, the present invention will be described by dividing each major process into an embodiment.

As a raw material for providing the pressure vessel of the present application, resin, which is a raw material, is intended to use EPOXY RESIN having characteristics of compressive strength of 1,290 kg / cm2 and tensile strength of 1,220 kg / cm2 as a resin (RESIN) material, and the nonwoven fabric uses NEXUS VEIL. The glass fiber was prepared by using 2200 TEX ROVING with SILANE treated TYPE "E" GLASS.

MOLD to be used herein as a preparatory step of the next MOLD can be produced in each of the wooden, FRP type, metal material according to the shape and size, the thickness and type of the molded product, bar of Figure 1 of the present application In the mold of the present application, the surface of the mold is precisely cut on the lathe using SEAMLESS PIPE as a material to obtain the exact diameter of the mold, and Cr coating is applied to smooth the upper surface thereof. The surface was cleaned with a rag to prevent foreign matters from falling off, to maintain a smoother surface.

After the release material is applied to the next process, a thin coating of silicon or polyvinyl alcohol (PVA) is applied to the surface of the polished MOLD. After the release material is applied, it is dried at room temperature for at least 30 minutes and then the next process is performed. .

Looking at the HAND LAY-UP process as the primary molding, as shown in Figure 4, the surface layer of Cr-coated MOLD with a HAND LAY-UP to overlap the non-woven fabric or NEXUS VEIL of weight 30g / m2 slightly to each other HAND LAY-UP molding process is carried out once, and the same RESIN as used for WINDING is applied by using roller. At this time, the amount of RESIN compared to nonwoven fabric or NEXUS VEIL is at least 95% by weight ratio. Apply as much as possible.

In this case, if it is less than 95%, it may cause a problem that the surface of the product is rough or demoulding is not easily performed.

Secondary molding is performed on the MOLD where the primary molding is completed by the FILAMENT WINDING technique, and the molding is performed on the STRUCTURE WALL by the FILAMENT WINDING method. In this case, the angle between the MOLD and the glass fiber is about 55 ± 2 degrees. You can maintain high strength by maintaining WINDING.

The process may be used as the FILAMENT WINDING M / C as shown in Figure 3 after the work of the inner surface layer is completed, in this application used a process of continuous WINDING using TYPE "E" GLASS 2200 TEX ROVING, EPOXY RESIN and ROVING maintains the ratio of 3: 7 by weight and WINDING ANGLE is carefully operated to maintain the optimum angle of 55 ± 2 degrees.

Next, the hardening process is carried out. The hardening process in the present application is performed while rotating the MOLD at a low speed of about 30 ± 10 rpm in a closed hardening furnace, and the internal temperature of the hardening furnace is maintained at about 120 ° C. to 150 ° C. and the hardening time. Was performed within 4-5 hours.

In addition, the demolding process in the present application may be performed using a hydraulic cylinder and a winch through the demolding machine having the structure of FIG. 6, and the MOLD transfer pedestal enables self-rotation using a rotatable transfer roller and RO VESSEL. JIG to fit the size was to be performed using a release plate made of FRP material.

In addition to the above main process, the cutting work performed by the secondary process can be performed by using a high speed cutter when cutting both ends, paying attention to the straightness of the processing cross section, chamfering the inner and outer surfaces, and the cutting work At the end, slow down and stop slowly so that ROVING can be pulled out to avoid groove digging.

In the tapping work process, the bolt hole processing for inserting the bolt is processed by horizontal tapping machine, but the processing by high speed is that the thread part is broken, so it is desirable to rotate and process at a low speed of about 100rpm. The BOLT is made of STS 304 material. The corners of the inserts are chamfered on the shelves and the opposite edges are rounded off. At this time, care should be taken not to scratch the threads and the surface should be polished.

In addition, in the END CAP process, the material of the END CAP can be fabricated using STS 304 and PVC, and it is desirable to work carefully to prevent discoloration of STS PIPE welding parts and to maintain gloss by chemical treatment.

In this case, if PVC plate is used, the surface must be processed to prevent the warpage of the plate, and when combined with the STS plate, the flatness must be maintained.

In the assembly process of this application, it is necessary to fasten using JIG so that the height and spacing of bolts are kept constant for each product, and care should be taken not to flow out of the hole by using the proper amount of BOND when tightening bolts. BOND "and" EPOXY RESIN for normal temperature hardening "can be used.

Testing and inspection of the finished product of the present application is based on whether or not the pressure vessel meets or exceeds the above characteristics based on whether the pressure vessel has a characteristic of no leakage of water and no physical deformation in appearance under water pressure of 40 kg / cm < 2 > They will have procedures to prepare the product for shipment without defects or contamination.

The manufacturing process of each pressure vessel is described in detail through the above description, but when described with reference to the drawings showing an embodiment of each process,

Figure 2 shows a perspective view of the pressure vessel article to be obtained herein, the pressure vessel 100 of the present application is horizontal to the center portion 70 and formed in the rear portion relatively relative to the center portion with both outer portions (80). The end plate fixing screw 81 is interpolated, the end plate (90) is coupled to the end plate (END plate) at both ends of the pressure vessel (100) to form a structure in which the bolt 82 is fastened and the pressure vessel (100) It can be provided.

FIG. 3 shows the general structure of the FILAMENT WINDING M / C 60, in which a plurality of strands of roving fiber yarn 62 are released from the roving grill 61 and impregnated through the first and second guide rolls 63 and 64. The guide fiber 67 moves while the roving fiber yarn 62 in which the EPOXY RESIN raw material 66 stored in the tank 65 is adsorbed and impregnated with the EPOXY RESIN maintains the angle set by the computer. A schematic diagram of a general winding machine 60 which can be wound to the mold 20 of the present application at an angle is shown.

4A is a perspective view of the mold of the present application, and FIG. 4B is a cross-sectional view for showing the inside of the mold. In one embodiment of the present application, an effective length of a water treatment pressure vessel is 6000 mm and a pressure vessel having an internal diameter of 220 mm is obtained. In order to make the pipe for the mold 20, using thick SEAMLESS PIPE as a material, the pipe is precisely processed on a lathe, and the surface is cut to have an outer diameter of 218 mm, and the surface is coated with Cr to make a smooth surface. By inserting the central shaft 10 at both ends of the mold to rotate and drive the mold, it is prepared for later use in demoulding.

The central shaft 10 of the MOLD 20 thus manufactured is subjected to HAND LAY-UP process by INNER LAYER molding while being slowly rotated by the winding machine of FIG. 3. The surface of the polished MOLD is silicon or polyvinyl. After thin coating of alcohol (PVA), the release material was applied and dried at room temperature for more than 30 minutes, and then rolled up once with the 80mm wide nonwoven fabric 15mm overlapped with MOLD to perform HAND LAY-UP molding. At this time, the same RESIN as used for WINDING is applied using a roller and the INNER LAYER layer 30 is formed.

In FIG. 5A, the structure of the pressure vessel on the mold of the present application is shown, and 5B is a cross-sectional view taken along the line A-A ', and the INNER LAYER (HAND LAY-UP) is performed on the mold 20 having the central axis 10. 30) to form the reinforcement layer (STRUCTURE WALL: 40) by performing the second molding by the FILAMENT WINDING technique on the MOLD where the primary molding is completed, and also maintains the forming angle between the mold and the roving yarn of the present application at 55 degrees. The strength of the finished product can be maintained only by maintaining the optimum angle of 55 degrees. In 5a, the molded product having the pressure vessel shape is horizontally in the center part 70 by performing the 1st and 2nd molding process. Is formed in the rear portion relative to the center portion with both outer portions 80, and shows the state before demoulding and cutting, and 5b shows the cut sectional view of A-A '.

6 shows a structural diagram of the demolder 50 used in the present application, the demolding process in the present application may be performed using the hydraulic cylinder 51, the winch 52, and the connection jack 55, and MOLD. (20) The transport base 53 allows the self-rotation using a transport roller that can be rotated, and indicates that the JIG adapted to the RO VESSEL SIZE can be performed by using a release plate 54 made of FRP material. Is showing.

After the demolding process, the cutting process of both ends is carried out. When cutting both ends, it can be performed by using a high speed cutter, paying attention to the straightness of the processing section, and chamfering the inside and outside surfaces, and cutting work. At the end of this time, the speed is reduced and slowly stops, so that the ROVING company is pulled out and the groove digging phenomenon is taken care of, and the pressure vessel shown in FIG. 7 is obtained.

7 is a hollow body pressure vessel obtained by performing the first, second molding process and demolding, cutting process of the present application to maintain the horizontal to the central portion 70 and to form a rear portion relatively to the central portion with both outer portions (80) The pressure vessel 100 is shown, and the outer portion 80 of the pressure vessel performs a bolt insertion process to form a connection portion for connecting with the end plate, and a bolt hole to be inserted in the tapping work process. An illustration of the processing and a perspective view after processing is shown, and the TAPPING work process is processed using a horizontal tapping machine, but the processing by the high speed is preferable to rotate by processing at a low speed of about 100rpm because the thread part is broken. In the bolt processing, BOLT uses STS 304 material, the edge of the insertion part is chamfered on the shelf, and the opposite edge is ROUND treatment. Be sure to close. At this time, care should be taken not to scratch the thread and the surface is preferably treated to be shiny.

As another process, the END CAP shown in FIG. 2 is manufactured. The material of the END CAP can be fabricated using STS 304 and PVC. It is desirable to maintain.

In this case, if PVC plate is used, the surface must be processed to prevent the warpage of the plate, and when combined with the STS plate, the flatness must be maintained.

In the assembly process of this application, it is necessary to fasten using JIG so that the height and spacing of the bolts are kept constant for each product, and care should be taken not to flow out of the hole by using the proper amount of BOND when tightening bolts. BOND "and" EPOXY RESIN for normal temperature hardening "can be used.

Testing and inspection of the finished product of the present application is based on whether or not the pressure vessel meets or exceeds the above characteristics based on whether the pressure vessel has a characteristic of no leakage of water and no physical deformation in appearance under water pressure of 40 kg / cm < 2 > They will have procedures to prepare the product for shipment without defects or contamination.

This product is applied by transforming the FILAMENT WINDING molding method into the method of making the pressure vessel used for the operation of the reverse osmosis membrane facility, and manufactured by the FILAMENT WINDING method using raw materials such as EPOXY RESIN and glass fiber, but there is no LINER inside and GEL COATING is applied. It is possible to provide a FRP pressure vessel that is light and without pressure.

This is a method of manufacturing FRP pressure vessel using the FILAMENT WINDING molding method, which prepares resin resin, nonwoven fabric, and glass fiber as raw materials, prepares MOLD for machine mounting, and applies mold release agent to MOLD surface HAND LAY-UP process to wind the nonwoven fabric on the surface of MOLD, and after the FILAMENT WINDING process using glass fiber and resin as the second molding, after curing in the curing furnace, demoulding from MOLD, cutting & tapping Through this process, FRP pressure vessel can be provided through product inspection and assembly process of each component such as housing, bolt, and end cap.

In addition, the pressure vessel produced by the above method as an ultimate effect of the present application has the effect of providing an FRP pressure vessel having physical properties without physical deformation of the LEAK of the water or the pressure vessel for more than 10 minutes under the water pressure of 40kg / cm2.

Claims (6)

 In the method of manufacturing a FRP pressure vessel using an filament winding molding method having EPOXY resin, nonwoven fabric (or NEXUS VEIL) and glass fiber,  MOLD precisely cuts the surface using seamless SEAMLESS PIPE with no seams or seams, and performs Cr coating on top of it.  Applying the release material by applying silicone or polyvinyl alcohol on the MOLD surface and drying at room temperature for 30 minutes or more, In the first molding HAND LAY-UP process, HAND LAY-UP molding is performed by winding a non-woven fabric or NEXUS VEIL having a weight of about 30 g / m ^{2 on a} mold and applying resin using a roller. In the second molding, the reinforcing layer is formed by the filing cementing method, but the weight ratio of EPOXY RESIN and ROVING is maintained at a ratio of about 3: 7 Performing a curing process in a closed curing furnace while maintaining a MOLD at a low speed of 30 ± 10 rpm, A method of manufacturing an FRP pressure vessel comprising the steps of an assembling process, such as a housing, bolt, and end cap, after demolding, cutting, and tapping as other auxiliary processes. The method of claim 1, A method of manufacturing an FRP pressure vessel, characterized in that the content of RESIN is maintained at least 95% relative to the nonwoven fabric (or NEXUS VEIL) when the resin is applied using a roller in the first molding process. The method of claim 1, Method of manufacturing an FRP pressure vessel, characterized in that for maintaining the angle between the MOLD and the glass fiber in the second molding process 55 ± 2 degrees. The method of claim 1, The internal temperature of the curing furnace in the curing process is maintained at 120 ℃ ~ 150 ℃ and the curing time is a manufacturing method of the FRP pressure vessel, characterized in that to maintain 4 to 5 hours. In FRP pressure vessel having EPOXY resin, non-woven fabric (or NEXUS VEIL) and glass fiber, made by filament winding forming method, MOLD uses SEAMLESS PIPE as a material to precisely cut the surface, Cr coating is applied on top of it, release material is applied by applying silicon or polyvinyl alcohol on the surface of MOLD, and non-woven fabric or NEXUS VEIL is applied to MOLD as the first molding. HAND LAY-UP molding is carried out by winding the wire, and the second molding is performed by the FILAMENT WINDING method on the reinforcing layer, but the WINDING is maintained by maintaining the angle between MOLD and glass fiber at 55 ± 2 degrees FRP pressure vessel characterized in that the assembly process, such as HOUSING, BOLT, END CAP, etc. after the demoulding, cutting, tapping process as other additional processes. The method of claim 5, The pressure vessel of claim 5, characterized in that the water leakage or more than 10 minutes under the conditions of water pressure 40kg / cm ² FRP pressure vessel characterized in that there is no physical deformation.

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