JPH1029689A - Preparation of double shell tank made of reinforced plastic and apparatus for preparing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make molding with easy defoaming and being uniform by a method wherein an outer shell is formed by rotating gradually an inner shell on every time after a process wherein cut glass roving and a resin compsn. are mixed and are fed to the outside of the inner shell while it is moved in the axial direction of the inner shell is completed. SOLUTION: This apparatus is installed on the outside of an inner shell and is constituted of a traverse trestle 3 moving back and forth in parallel to the horizontal axis of the inner shell, a trestle driving device 4, a transfer device consisting of rail 5 for traverse, a feeding device 6 carried on the traverse trestle 3, a defoaming device 7 and a roller 8 rotating the inner shell by a definite ratio around the horizontal axis as a center and a roller driving device 9. The feeding and defoaming devices 6 and 7 which feed and defoam cut glass roving 10 and a resin compsn. 11 are moved back and forth in the axial line direction on the outside of the inner shell by means of this apparatus and then, the work which rotates the inner shell by a definite ratio and moves it back and forth is repeated to mold uniformly an FRP layer on the outer peripheral face of the inner shell.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a reinforced plastic double shell tank and an apparatus for manufacturing the same.

[0002]

2. Description of the Related Art Among underground storage tanks installed at refueling stations, a steel tank specified by law is used as a device to detect leakage of dangerous substances from the tank, using a reinforced plastic on the outer surface of the tank. The installation of underground tanks (reinforced plastic double-shell tanks, hereinafter referred to as SF double-shell tanks) that form layers and protect the tanks from soil corrosion has been approved (Dangerous goods regulations in 1993). And some regulations on dangerous goods regulations). The design and manufacturing standards for SF double shell tanks are:
Investigation report on the safety of SF double-shell tanks used as underground tanks (Report of the Review Committee) and Fire Defense No. 66 (September 2, 1993) reinforced plastic double-shell tanks In March 1994, the Petroleum Association of Japan issued "Standard Specifications for Designing and Manufacturing Double Shell Tank Tanks Made of Reinforced Plastics" based on the technical standards of "Operation of such regulations" (Notice of Dangerous Goods Control Division of the Fire and Disaster Management Agency). The SF double-shell tank has a steel inner shell of the underground tank body and an FRP outer shell for forming a gap for detecting leakage of dangerous substances. The gap for leak detection shall be provided up to the part exceeding the maximum liquid level of the tank, and the structure shall be such that the FRP and the steel plate surface are bonded on the outer surface of the gas phase part at the top of the tank to maintain the airtightness of the detection gap. Have been.

As the outer shell FRP molding method, 1) a molded sheet method, 2) a hand lay-up method, 3) a spray-up molding method, 4) and a method based on a combination of the above-mentioned production methods have been established. Here, the spray-up molding method uses a spray gun, and simultaneously mixes a resin and glass fiber (glass roving is made into a predetermined short fiber with a rotary cutter and is called a glass chop). This is a method in which the FRP layer is sprayed to the inner shell tank and the FRP layer is laminated to a predetermined thickness. The spray-up method is a continuous F
Since the RP layer is laminated, a seamless FRP layer can be formed efficiently, but quality and process control compared to the hand lay-up method, such as spray lamination technology, uniformized glass fiber content, and defoaming technology Skilled engineers and work equipment are required. However, there is a problem that it is difficult to secure skilled workers, and that no appropriate working equipment has been developed, so that the FRP layer cannot be suitably formed.

[0004] An SF double shell tank molding method is disclosed in US Patent No. 4,817,817. The method described here involves welding a spindle to the mirror of the inner shell tank,
It is described that the spindle is received by a support and rotated around a tank axis to perform a molding operation. However, it is not shown how to combine with a spray-up machine.

A filament winding method (FW method) is generally known as a method of performing FRP molding by rotating a tank. A method practically used as a FW method for large-diameter pipes is a chop hoop FW method manufactured by Venus Corporation of the United States. This method is a method combining the spray-up method and the FW method (refer to J. Raymer: 37th Ann, Co.
nf.SPl-RP / C, 4B (1982)). In this method, a glass fiber chip and a resin are sprayed on a rotating mandrel, and the roving is wound thereon. By using an inner shell tank instead of the mandrel, the chop hoop FW method can be used. According to this method, a cylindrical FRP can be molded efficiently and uniformly. However, when applied to the molding of the outer shell FRP of the SF double shell tank, the following disadvantages occur and it is difficult to utilize.

1) To rotate the inner shell tank, it is necessary to weld a spindle to the tank mirror. After the FRP is formed by the chop hoop FW method on this spindle, a post-process in which the spindle is cut to form a mirror portion occurs. 2) The inner shell tank is equipped with pipes for taking in and out the contents (gasoline), exhaust pipes, flanges, manholes, and protrusions such as metal fittings for tanks. is there.

[0007] Apart from the chop hoop FW method, there is a molding machine Reciprocater developed by Venus Corporation of the United States as a known technique which is considered to be applicable to the molding of the FRP outer shell of a double shell tank such as an SF double shell tank. In this technology, an endless belt having a constant width or a mold of a finite length is sent at a constant speed, a spray-up machine set at the top of the mold is reciprocated to the mold width, and the glass fiber chop and resin are placed on the mold. This is a method in which a spray-up is performed, and a defoaming roll set on the entire surface of the mold width is operated to automatically defoam, thereby continuously forming an FRP plate. This technology is applied to double shell tanks such as SF double shell tanks.
When applied to the molding of the RP outer shell, the following problems occur and cannot be used.

1) There is a limit to the width that can be formed, and the width of the double shell tank when forming the outer shell of the FRP is about 10,000 mm, making it difficult to form the FRP uniformly. 2) It becomes necessary to attach a defoaming roll over the entire forming width,
It is difficult to drive and handle the defoaming roll. 3) Similar to the chopping hoop FW method, it is necessary to weld a spindle to the inner tank mirror and rotate it at a constant speed.

[0009]

The invention according to claims 1 to 4 solves the above-mentioned problems of the prior art and employs a spray-up method in which defoaming is easy and uniform molding is easy.
An object of the present invention is to provide a method for manufacturing a reinforced plastic double shell tank for forming an RP shell. The invention according to claims 5 to 8 provides a manufacturing apparatus for manufacturing a reinforced plastic double shell tank which solves the above-mentioned problems.

[0010]

According to the present invention, the step of mixing the cut glass roving and the resin composition while supplying the resin composition to the outside of the inner shell and removing the bubbles while moving in the axial direction of the inner shell is performed in this step. A method of manufacturing a reinforced plastic double-shell tank, wherein the outer shell is formed by rotating the inner shell little by little each time the step is completed. Further, according to the present invention, in this production method, the resin composition has air curability and a viscosity of 2.
Production of a reinforced plastic double-shell tank made of a highly reactive isophthalic acid-based unsaturated polyester resin set at 5 to 5.5 poise, a degree of thixability of 2 to 3, and a curing time of 6 to 12 minutes. About the law.

Further, the present invention provides a method for producing a reinforced plastic tank comprising a curable resin composition in which the hardness of a molded product is 40 or more in Barcol hardness 20 minutes after the start of reinforced plastic molding. About the law. Further, in the present invention, in this production method, vinylon cold gauze is applied to the entire outer surface of the bottom portion of the inner shell tank including the detection tube mounting position, and a polyvinylidene chloride film is formed thereon as a release film of the detection layer portion. The present invention relates to a method for producing a reinforced plastic double shell tank in which an outer shell is formed by winding a shell.

Further, the present invention provides a supply defoaming device for mixing and supplying and defoaming a glass roving cut to the outside of an inner shell and a resin composition, and supporting the supply defoaming device in the axial direction of the inner shell. The present invention relates to an apparatus for manufacturing a reinforced plastic double shell tank including a moving device for reciprocating a supply and defoaming device and a driving device for rotating an inner shell. The present invention also provides a defoaming roll (7a) having a groove shape in a circumferential direction, which has a conical shape adapted to the shape of an inner shell tank that rotates in contact with the outer surface of the inner shell. A support arm (7b) for supporting the defoaming roll, a support arm (3a), and a cylinder (7c) are connected to each other at a fulcrum, and the support arm (X2) is centered in the traverse rack traveling direction. 3a) A structure which can be reversed so as to always be rearward with respect to 3a), and is provided with a defoaming device for setting the pressure of the defoaming opening (7a) to 20 to 150 g / cm by the cylinder (7c). Item 5 relates to an apparatus for producing a reinforced plastic double shell tank.

[0013] The present invention also provides a manufacturing apparatus comprising:
The drive unit has a roller that carries the inner shell and drives it to rotate. The number of rollers is two or more, and the load applied per unit length of the width of each roller is 6 kg / cm or less. The present invention relates to an apparatus for manufacturing a plastic double shell tank. Further, according to the present invention, in this manufacturing apparatus, the roller on which the inner shell is mounted and which rotates the inner shell is configured to be movable in the axial direction of the mounted inner shell, and protrusions such as manholes and tank nozzles attached to the inner shell are provided. 8. A manufacturing apparatus for a reinforced plastic double shell tank according to claim 7, wherein the apparatus is fixed so as not to obstruct rotation of the inner shell.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In the apparatus of the present invention, a supply defoaming device for feeding and defoaming a cut glass roving and a resin composition is mechanically reciprocated in the axial direction outside the inner shell. After the inner shell is rotated at a constant rate, it is reciprocated. By repeating this operation over the entire outer surface of the inner shell, the FRP layer can be formed uniformly. The inner shell is made of steel, FRP, or the like.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic front view showing an example of the manufacturing apparatus of the present invention, and FIG. 2 is a side view thereof. This manufacturing apparatus is installed outside a steel inner shell 1 and reciprocates in parallel with a horizontal axis 2 of the steel inner shell.
A moving device including a traverse rail 5, a supply device 6 mounted on a traverse base 3, a defoaming device 7, and an inner shell 1
And a roller driving device 9 for rotating the roller 8 at a fixed rate about the horizontal axis 2. 10 is a glass roving, 11 is a resin composition, 12 is a curing agent, and 13 is a detection device.

FIG. 3 is an explanatory diagram showing an example of the supply device 6. FIG. 3A is a top view and FIG. 3B is a side view. The supply device 6 includes a resin supply pump 6b, a hardener supply pump 6c (all shown in FIG. 1), a supply nozzle 6a, a receiving roller 6d for cutting the glass roving 10, a roller 6e with a cutting blade, and a pinch roller 6f. The glass roving 10, which is a continuous filament, has a receiving roller 6d.
The glass roving 10a (referred to as a glass chop) is supplied between the roller 6f and the pinch roller 6f and cut by the roller 6e with a cutting blade by the driving of the receiving roller 6d. The cutting length of glass roving is roller 6 with cutting blade.
It can be changed by the pitch e between the blades. On the other hand, the resin composition 11 and the curing agent 12 are supplied to the supply nozzle 6a by the resin supply pump 6b and the curing agent supply pump 6c (both shown in FIG. 1), are included in the resin composition 11, and are cut into glass rovings. 10a, and the mixture is dispersed and supplied to the outer surface of the steel inner shell 1 in a mixed state. The mixture of the glass chop 10a and the resin composition 11 supplied to the outer surface of the steel inner shell is impregnated and defoamed by the defoaming roll 7a rotating in contact with the outer surface of the steel inner shell shown in FIG.

FIG. 4 is an explanatory diagram showing an example of the defoaming device 7. FIG. 4A is a top view thereof, and FIG. 4B is a side view thereof. The defoaming device 7 includes a defoaming roll 7a that rotates in contact with the outer surface of the inner shell (shown in FIG. 1), a support arm 7b that supports the defoaming roll 7a, and a cylinder 7c,
It is attached to a support arm 3 a fixed to the traverse base 3. The respective components are connected so as to be rotatable at fulcrums shown at (a), X1 to X4, and Y1 to Y4. The defoaming roll 7a is inverted so as to be located behind the support arm 3a with respect to the traveling direction of the traverse rack,
A single defoaming roll can perform a reciprocating defoaming operation.

Although the structure of the defoaming roll 7a is not particularly limited, it has a cylindrical shape having a diameter of 50 to 250 mmφ and a groove (as shown) conforming to the outer shape of the inner shell, and has a groove in the surface circumferential direction. It is preferable to attach a
A brush or the like may be wound around. Further, a washer-shaped ring may be arranged side by side. The cylinder 7c presses the defoaming roll 7a against the outer surface of the steel inner shell 1 and moves it up and down. As the cylinder 7c, a pressure regulator such as an air cylinder and a hydraulic pressure is used. The pressure of the pressure regulator is preferably set such that the defoaming roll 7a is on the outer surface of the steel inner shell 1 at about 20 to 150 g / cm with respect to the length of the defoaming roll. If the pressure is low, defoaming will not occur, and if the pressure is too high, the FRP laminate will be scratched and cannot be molded.

Next, switching of the traverse stand 3 in the traverse direction will be described. As shown in FIG. 1, the detection devices 13 are installed at both ends of the traverse rail 5 and function to switch the moving direction of the traverse rack 3. As the detection device, a generally used limit switch, photoelectric tube, or the like can be used.

Next, the roller 8 and the roller driving device 9 for rotating the steel inner shell 1 at a fixed rate about the horizontal shaft 2 will be described. The traverse base 3 is moved to the position of the detection device 13 and the glass chop 10 a cut on the outer surface of the steel inner shell 1.
After the supply and defoaming of the resin composition 11 are completed, the roller driving device 9 is operated, and the steel inner shell 1 is rotated around the horizontal shaft 2 at a fixed rate via the roller 8 connected thereto, and stopped. While moving the traverse gantry 3 in a state where the rotation is stopped, the glass chop 10a and the resin composition 11 are supplied to perform a defoaming operation of laminating FRP. FRP by stopping rotation of steel inner shell at a fixed rate and moving traverse rack 3
By repeatedly performing the laminated defoaming of above, the FRP is mechanically laminated and defoamed over the entire outer periphery of the steel inner shell and cured to produce a reinforced plastic double shell tank. The number of rollers 8 for mounting the inner shell tank is two to four or more, and the structure is such that it can slide in the axial direction of the inner shell tank to be mounted, and is located at a position avoiding projections such as manholes and tank nozzles attached to the inner shell tank. Fix so that the inner tank does not hinder rotation.

Next, the relationship between the moving speed of the traverse stand, the capability of the supply device for the glass chop and the resin composition, and the rotation of the steel outer shell will be described. Assuming that the supply amount of the supply device is constant and the moving speed of the traverse gantry is constant, the thickness of the stacking by one movement is constant. The supply width of the glass chop 10a and the resin composition 11 of the supply device is generally 20 to 30.
cm, the central portion is thicker, and the terminal portion is thinner.
It is thicker at the center and thinner at the periphery with a width of cm. In order to make the thickness in the circumferential direction uniform, the steel inner shell is rotated at a fixed rate, laminated, and repeated, so that the thickness in the circumferential direction is made uniform. The smaller the rotation ratio of the steel inner shell (the length of the outer periphery of the steel inner shell that moves by rotation is referred to as the feed width), the more uniform the thickness in the circumferential direction becomes. It is necessary to move the traverse mount quickly to keep it constant. When the supply width is adjusted to 20 to 30 cm, the feed width of the steel inner shell is desirably 5 cm or less. When the feed width is set to 5 cm and the supply width to 20 to 30 cm, 4 to
A predetermined lamination thickness can be obtained by five traverse movements, and a uniform thickness can be formed as a whole. The molding time is determined by the supply capacity of the supply device for the glass roving and the resin composition used in the present invention. If the capacity is small, molding time is required, and molding efficiency is low. If the capacity is large, it is necessary to increase the moving speed of the traverse rack. A suitable supply capacity is about 2 to 15 kg / min.

One example of the production of the FRP outer shell of the SF double shell tank of the present invention will be described with reference to FIG. As shown in FIG. 1, a steel inner shell 1 is installed on a roller 8 for rotating the inner shell 1 about the center of a horizontal shaft 2 with a gas phase portion when used up. The end of the end portion of the FRP head plate which has been FRP molded in advance on the mirror portion of the steel inner shell
A surface of 0 mm or more is roughened by a predetermined method and set so as to cover the tank mirror. Before setting, a release film is wrapped around the body of the steel inner shell, which is the end of the end plate. FR is applied to the gas phase of the steel inner shell by a predetermined method.
A primer treatment for improving the adhesion to the P layer is performed. The terminal of the release film is fastened with an adhesive tape at the boundary between the gas phase portion and the detection layer portion so that the release film can be wound while the FRP is formed on the detection layer portion in use. Thus, preparation for forming the FRP layer of the body portion of the steel inner shell according to the present invention is completed. Lamination defoaming is performed while traversing the traverse stand, and lamination is performed while the body portion of the steel inner shell is rotated clockwise in FIG. It is necessary to adjust the curing time of the cured product so that the laminated product is cured at the time when the laminate is rotated clockwise by about 90 degrees from the upper position. It is preferable to provide a curing device for accelerating the curing, if necessary. When the molding is continued by rotating to the right in order, the formed FRP outer shell is fed so as to bite into the roller 8 of the driving device of the inner shell tank. Rotate to the right sequentially to continue molding, and when it reaches the boundary between the gas phase and the detection layer, cut the release film along the boundary line, stop with adhesive tape, continue molding, and start molding. One rotation until the manufacturing is completed. The manufactured SF double-shell tank has a structure in which the FRP layer is formed on the release film on the detection layer portion, and only the FRP layer is formed on the gas phase portion.

The material for forming the SF double-shelled tank is defined in "Standard Specifications for Designing and Manufacturing Double-Shelled Tank Made of Reinforced Plastic". As the resin, an isophthalic acid-based unsaturated polyester resin, a bisphenol-based unsaturated polyester resin, a vinyl ester resin, an epoxy resin, and the like are used, and the glass fiber is a glass chopped strand mat, glass roving, treated glass cloth, glass roving cloth, and the like. Is used. In the present invention, it is preferable to use a cold-setting resin, for example, an isophthalic unsaturated polyester resin as the resin.

In the present invention, it is preferable to use an isophthalic acid-based unsaturated polyester resin for spray-up molding and glass roving. In particular, it has an air-curing property, and has a viscosity of 2.5 to 5.5 poise at a temperature during molding operation.
When a resin set to have a degree of whisker of 2 to 3 and a gelation time of 6 to 12 minutes is used, a resin layer similar to the top coat layer is obtained on the FRP surface. Therefore, a post-process of the top coat layer can be omitted. When the viscosity and the thixotropic degree are lower than the above values, a top coat layer cannot be obtained, and when the viscosity is higher than the above values, the top coat layer becomes thick, and the unevenness of the roll groove of the defoaming opening during molding and defoaming work. Are left in a streak, resulting in poor appearance.

In the molding method of the present invention, the molded F
The RP outer shell is fed so as to bite into the roller 8 of the driving device in a short time. Since the inner shell tank is made of steel and has a considerable weight, if the FRP formed has poor curability, the mouthpiece 8 and the FRP that has bitten into the inner shell tank will buckle due to the compressive force. To prevent buckling due to this compressive force, 1) harden the FRP biting into the roller 8 and the inner shell tank so as to withstand the compressive force, and 2) disperse the weight of the steel tank to reduce the compressive force applied to the FRP. It is necessary to make it smaller.

The present inventors evaluated the hardening property (degree of hardening) of FRP with a Barcol hardness tester and experimentally determined the relationship between the buckling strength due to compression. FIG. 5 shows the results. 4mm F
An RP plate was prepared for lamination, and a test piece of an FRP plate having a predetermined hardness was subjected to a compression test to determine the buckling load while checking the curability with a Barcol hardness meter at each elapsed time. The buckling strength is obtained by compressing the buckling load with an indenter (shape r = 5mm, length 50mm)
Of the test piece (50 mm). In FIG. 5, the calculated value of the compressive stress at the time of forming a 30 kL tank is the total length of the contact length of the tank mounting roller with the tank, where the load due to the tank's own weight is 7000 kg.
The value is calculated as 00 mm (roller width 150 mm, number of rollers 8). That is, in the present invention, 150
In the case where eight rollers with a width of 8 mm are installed,
A compressive stress of 5.8 kg / mm will be generated. In order that the FRP that bites into the roller does not cause buckling, a hardness of about 40 or more in Barcol hardness is required.

When the time for forming the FRP on the body of the 30 KL steel inner shell tank by using the manufacturing apparatus of the present invention is set to about 1 hour, the FRP formed on the steel inner shell is driven by a tank driving roller. It takes about 20 minutes to dig into 8.
That is, it is necessary to select a curable resin and a hardening agent that have a Barcol hardness of 40 or more in 20 minutes after laminating the FRP. Room temperature-curable unsaturated polyester resins have poor curability at low temperatures, and it is extremely difficult to satisfy such conditions. In addition, when the curing is advanced in a short time, the FRP is distorted due to the curing shrinkage of the resin, which causes a defect that the molded FRP is whitened. The present inventors have conducted various studies to solve these problems, and as a result, have set the roller to a rubber tire and
By increasing the contact area between RP and roller, F
It has been found that the target value of the RP Barcol hardness can be reduced from 40 or more to about 1 or more.

On the other hand, a resin, a hardening agent, a hardening accelerator, a hardening accelerator, etc., having a Barcol hardness of 1 or more in 20 minutes after forming the FRP were examined. Room temperature-curable, highly reactive, isophthalic acid-based unsaturated polyester resin (e.g., Porori set 668 APT, trade name of Hitachi Chemical Co., Ltd.) 10 containing 0.5%.
0 to 0.5 parts by weight of dimethylaniline as a hardening accelerator, 0 to 0.5% by weight, and a hardening agent obtained by combining methyl ethyl ketone peroxide and acetylacetone peroxide (for example, Percure NA, Nippon Oil & Fat)
It has been found that the object can be achieved by combining 0.5 to 3.0% by weight (trade name). Table 1 shows examples of the molding temperature and the proper blending amounts of the co-promoter and the curing agent. Also,
The glass roving in combination with the resin of the present invention has R
2310-06-54 (trade name of Nitto Boseki Co., Ltd.) was particularly suitable.

[0029]

[Table 1]

In the present invention, as a result of various studies, a release film used for forming the detection layer has a thickness of about 40.
Pm films of polyvinylidene chloride are preferred. Further, it is preferable to insert and use vinylon cooling gauze having a width of, for example, about 230 mm over the entire length of the tank body on the outer surface of the bottom including the detection tube mounting position of the inner shell tank as a spacer net.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments.
Using the apparatus shown in FIGS. 1 and 2, a nominal capacity of 30 KL was manufactured under the conditions shown in Tables 2, 3 and 4.

[0032]

[Table 2]

[0033]

[Table 3]

[0034]

[Table 4]

[0035]

According to the production method according to claims 1 to 4,
Since the outer layer portion of the body FRP of the reinforced plastic double shell tank can be formed mechanically, FRP molding with uniform thickness and high molding efficiency becomes possible. It is superior in terms of quality as compared with the conventional molding sheet method and hand lay-up method, and the molding man-hour is reduced by about 1/20. According to the manufacturing apparatus of claims 5 to 8, a reinforced plastic double shell tank can be easily manufactured by the above manufacturing method.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an example of a manufacturing apparatus of the present invention.

FIG. 2 is a schematic side view showing an example of the manufacturing apparatus of the present invention.

FIG. 3 is an explanatory diagram showing an example of a supply device for a resin composition and glass roving.

FIG. 4 is an explanatory diagram showing an example of a defoaming device.

FIG. 5 is a graph showing the relationship between Barcol hardness and buckling strength due to compression.

[Explanation of symbols]

 1: inner shell 2: horizontal axis 3: traverse mount 3a: support arm 4: gantry drive 5: traverse rail 6: supply device 6a: supply nozzle 6b: resin supply pump 6c: curing agent supply pump 6d: receiving roller 6e : Roller with cutting blade 6f: Pinch roller 7: Defoaming device 7a: Defoaming roll 7b: Support arm 7c: Cylinder 8: Roller 9: Roller driving device 10: Glass roving 10a: Glass chop 11: Resin composition 12: Curing Agent 13: Detection device X1 to X4: fulcrum Y1 to Y4: fulcrum

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B29K 105: 08 (72) Inventor Kazuyuki Tsujino 4-3-1-1, Higashicho, Hitachi City, Ibaraki Prefecture Hitachi Chemical (72) Inventor Hirotake Sukekawa 5-1-1, Motomiyacho, Hitachi City, Ibaraki Prefecture Hitachi Chemical Techno Plant Co., Ltd. 5-12-15 Honcho Nikko Chemical Co., Ltd. Namerikawa Plant

Claims (8)

[Claims] 1. A step of mixing a cut glass roving and a resin composition while supplying the resin composition to the outside of the inner shell while moving in the axial direction of the inner shell, and defoaming each time this step is completed. A method for manufacturing a reinforced plastic double shell tank, characterized in that the shell is rotated little by little to form an outer shell. 2. The resin composition has air curability, a viscosity of 2.5 to 5.5 poise, a degree of thixotropicity of 2 to 3, and a curing time of 6-1.
The method for producing a reinforced plastic double shell tank according to claim 1, wherein the highly reactive isophthalic acid unsaturated polyester resin set at 2 minutes is a resin composition. 3. The process for producing a reinforced plastic tank according to claim 1, wherein the resin composition has a curability such that the hardness of the molded product becomes 40 or more in Barcol hardness 20 minutes after the start of reinforced plastic molding. 4. A vinylon cold gauze is applied to the entire outer surface of the bottom portion of the inner shell tank including the position where the detection tube is mounted, and a polyvinylidene chloride film is wound thereon as a release film of the detection layer portion. The method for producing a reinforced plastic double shell tank according to claim 1 to be formed. 5. A supply and defoaming device for mixing and supplying and defoaming a glass roving cut outside the inner shell and a resin composition, supporting a supply and defoaming device, and supplying and defoaming in the axial direction of the inner shell. An apparatus for manufacturing a reinforced plastic double shell tank, comprising a moving device for reciprocating the device and a driving device for rotating the inner shell. 6. A defoaming roll (7a) having a conical shape conforming to the shape of an inner shell tank that rotates in contact with the outer surface of the inner shell, and having a circumferential groove, and a support for supporting the defoaming roll. An arm (7b), a support arm (3a), and a cylinder (7c), each of which is connected at a fulcrum, and is always positioned with respect to the support arm (3a) in the direction of travel of the traverse base around the fulcrum (X2). 6. The reinforced plastic according to claim 5, wherein the reinforced plastic has a structure capable of being inverted so as to be backward, and has a defoaming device for setting a pressure of a defoaming opening (7a) to 20 to 150 g / cm by a cylinder (7c). Equipment for manufacturing double shell tanks. 7. A driving device has a roller on which an inner shell is mounted and which rotates the inner shell. The number of rollers is two or more, and a load applied to a unit length of each roller is 6 kg / cm or less. The apparatus for manufacturing a reinforced plastic double shell tank according to claim 5. 8. A roller having an inner shell mounted thereon and driven to rotate the inner shell has a structure capable of moving in the axial direction of the mounted inner shell.
8. The manufacturing apparatus for a reinforced plastic double shell tank according to claim 7, wherein the structure is fixed so as to avoid a protrusion attached to the inner shell and does not hinder rotation of the inner shell.