JPS59167228A - Preparation of composite plastic tank - Google Patents

Abstract

PURPOSE:To provide a tank efficiently by expanding the inner shell of the tank. CONSTITUTION:The outer shell 12 of a tank is prepared by fiber reinforced plastics. A thermoplastic pipe 1 is heated and inserted into the outer shell 12 of the tank. In this case, one end of the pipe 1 is provided so that it is projected out of the outer shell 12 of the tank. Both ends of the pipe 1 are closed tightly by plugs 3, 4. An air pressure pipe 5 is connected to the air passageway 2 of the plug 4, the pressure air pushes and expands the inner part of the pipe 1 and the projected end 1A of the pipe 1 is compressed according to the expansion of the pipe 1 through the plug 3. In this manner, an inner shell 11 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a composite plastic tank used, for example, for storing and transporting chemicals.

This type of tank usually has an inner wall made of thermoplastic, which has chemical resistance but poor mechanical strength, and an outer wall made of fiber-reinforced plastic, which has poor chemical resistance but high mechanical strength. It is.

Conventionally, in order to manufacture this type of tank, a tank base serving as an inner wall was first manufactured by welding and assembling thermoplastic plates, and the outer periphery of the tank base was coated with a fiber-reinforced plastic layer. However, welding and assembling the tank base is mostly done manually, requiring skilled workers, and is extremely inefficient.

The present invention aims to improve the above-mentioned conventional drawbacks and efficiently manufacture this type of tank, and its main feature is to manufacture the tank inner shell by expansion molding.

The invention will be explained in detail below.

The present invention consists of the following five steps.

1. Step 1 of manufacturing a tank shell from fiber-reinforced plastic. 2. Step 2 of heating and softening the thermoplastic pipe. 3. Inserting the heated softened thermoplastic pipe into the tank shell, but step 3.4 of making one end of the thermoplastic pipe protrude from inside the tank shell; step 4.5 of sealing both sides of the thermoplastic pipe; Steps and steps of manufacturing the tank inner shell by applying pressure fluid inside to perform expansion molding while pressing & Step 1. The tank outer shell (6) is manufactured from 1dali fiber-reinforced plastic (hereinafter referred to as FRP).

As a specific manufacturing method, as shown in Section 1 (2), glass fiber, carbon fiber, etc. Roving (c) A consisting of fibers is used as a peroxide catalyst.

After impregnating a resin raw material such as unsaturated polyester, diallylphthalate, or styrene to which a catalyst such as an azo thread catalyst has been added, it is wound and cured by heating or at room temperature.The back core type (e) A is extracted, and then the shell type wire is formed. A method of removing B by dissolving or crushing it, which does not involve adhering the mixture of the resin raw material and fibers to which a catalyst has been added by spraying or centrifugal force to the inner wall of the splittable outer mold, and by splitting the hardened liquid outer mold and removing it. There are general methods, such as the method of forcing.

Engineering grade 2. For example, a pipe made of thermoplastic plastic such as polyvinyl chloride, polyethylene, polypropylene, polytetrafluoroethylene, etc. is heated to a temperature higher than its softening temperature in a heating furnace or the like to soften it.

In step 8, as shown in FIG.
) into the tank shell. At this time, one end of the pipe (1) should be exposed from the outer shell of the tank. This end is called the outer end (1)A.

Step 4. In this case, both ends of the pipe (1) are sealed with plugs (3) and (4) as shown in Figure 3. Plug body (4
) is provided with a ventilation hole (2).

5. In this case, the air pressure pipe (5) is connected to the vent hole (2) of the plug body (4), and pressurized air is applied to the inside of the pipe (1) to make it expand and mold the outside end (1) of the pipe (1). )
A is pressed through the stopper (3) in accordance with the expansion of the pipe (1). As described above, by pressing the outer end of the pipe (1) in accordance with the bulge of the bife tortoise, the thickness of the molded product is prevented from becoming thinner. This state is shown in FIG. In this way, the tank inner shell aη is obtained. After forming the tank inner shell α°C, the pressurized air in the tank inner shell αη is discharged through the vent hole (2) of the plug body (4). Then hot water if desired.

Low-pressure steam, hot air, etc. are sealed inside the tank base side and cooled while annealing is performed in steps 1 to 1. In order to improve the adhesion between the tank inner shell αD and the tank outer shell (2), epoxy resin is applied as a primer to the inner wall of the tank outer shell (6) before forming the tank inner shell αD.

It is also possible to apply acrylic resin, polyester resin, or the like.

Thus, as shown in Fig. 5, a composite plastic tank with an inner wall made of thermoplastic (bivalent plastic) and an outer wall made of FRP is constructed.
If desired, a bottom cover 0e, a top cover α■, a liquid inlet α(A), a liquid outlet 09, etc. can be attached to the tank QQ.

Since the present invention first manufactures the tank outer shell using FRP, no mold such as a tank mold is required at all when blow molding a thermoplastic plastic snack pipe. Since the inner shell of the tank is fabricated by expansion molding of the thermoplastic pipe, laborious manual construction such as welding and assembly that requires skill is completely unnecessary, and the demolding process is also eliminated. This greatly shortens the manufacturing process.

During expansion molding, the end of the pipe that protrudes from the tank mold is pressed in line with the expansion of the pipe, resulting in a tank base with a uniform wall thickness. By reinforcing the outer periphery with FRP, a composite plastic tank suitable for storing and transporting chemicals is manufactured.

[Brief explanation of drawings]

The drawings relate to one embodiment of the present invention, and FIG. 1 shows step 1. 2 is a side sectional view showing step 3; FIG. 3 is a side sectional view showing step 4; FIG. Figure 5 is a cross-sectional view of 01 and 11 of the completed product.
2)...Vent hole, (3), (4)...Plug body,' (5)...Air pressure pipe, θQ...Composite plastic tank, α1)...Tank Inner shell, (2)
...Tank outer shell patent applicant Aron Kasei Co., Ltd. Figure 2 Kaya 4 Figure 〆-12 /

Claims (1)

[Claims] Step 1 of manufacturing a tank shell from fiber-reinforced plastic; Step 2 of heating and softening the thermoplastic pipe; Inserting the heated softened thermoplastic pipe into the tank shell; Step 8: Sealing both ends of the thermoplastic pipe so that one end of the thermoplastic pipe is exposed from the inside of the tank shell. Step 4: Pressing the outside end of the thermoplastic pipe while pushing the inside. A method for manufacturing a composite plastic tank, which comprises steps 1, 2, 8.4.5, which are steps 1, 2, 8, and 4.5, which are steps 1, 2, 8, 4, and 5, of manufacturing a tank inner shell by applying a pressure fluid to the tank and performing expansion molding.