JPH0511011B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application This invention relates to the manufacture of large containers for ships, bathtubs, and tanks, and more specifically, the invention relates to the manufacture of large containers for ships, bathtubs, and tanks, and more specifically, the invention relates to the manufacture of large containers for ships, bathtubs, and tanks, and more specifically, the invention relates to the manufacture of large containers such as ships, bathtubs, and tanks, and more specifically, glass fiber reinforced plastics (FRP) made of a glass fiber layer and an unsaturated polyester resin. ) Concerning the manufacturing method of large containers.

(b) Conventional technology In addition to the hand lay-up method and spray-up method, conventional methods for manufacturing large FRO containers include the resin wicking molding method (Marco method).

In this molding method, a glass fiber is laid and positioned to a predetermined thickness of the molded product on top of a male FRP mold, a female mold is placed on top of this, and a vacuum pump is connected to the top of the female mold. This is a molding method in which resin mixed with a curing agent is supplied from a tank to the bottom of the mold, and the resin is sucked up from the top.

In this molding method, male and female molds are used, so even if atmospheric pressure acts on the mold when sucking up the resin, it cannot be applied sufficiently and uniformly to the product. Therefore, there are problems in that the resin is not sufficiently sucked up and unevenness occurs, and that there is more resin than glass fiber, and as a result, sufficient strength cannot be obtained.

Furthermore, since the amount of resin is large, it is necessary to mix a wax component into the resin in advance to accelerate curing during drying. After molding, this wax component floats to the surface of the product to form a film, which blocks contact with air and accelerates curing.

(c) Problems to be Solved by the Invention The object of the present invention is to provide a method for manufacturing a large-sized container that can obtain uniform and sufficient strength by increasing the amount of glass fiber than the amount of resin.

(d) Means for Solving the Problems This invention lays a glass fiber layer in a predetermined layer on a formwork, covers the glass fiber layer with an airtight sheet material above it to seal the glass fiber layer, and creates a vacuum inside this sealed chamber. This method is characterized in that it is a manufacturing method for a large container in which a resin liquid is injected under pressure, and atmospheric pressure is applied to an airtight sheet to impregnate a glass fiber layer with the resin liquid.

(e) Effects of the invention According to this invention, atmospheric pressure is applied to the airtight sheet material by suction negative pressure, and the product is pressed uniformly, so this pressing action reduces the amount of resin liquid. By increasing the amount of fiber and therefore the glass fiber content, the strength of the product can be significantly improved compared to the conventional manufacturing method in which no pressing is performed.
In addition, because atmospheric pressure acts uniformly on the entire surface of the product, uniform strength can be obtained.

In addition, because sufficient strength is obtained by reducing the amount of resin through the pressing action described above, there is no need to mix a brazing component into the resin liquid in advance to accelerate curing during drying, as is the case with conventional methods. No longer needed.

(F) Embodiment of the Invention An embodiment of the invention will be described in detail below based on the drawings.

The drawings show an apparatus for manufacturing large containers, and in FIG. 1, reference numeral 1 denotes an outer mold (mold) made of metal, the inner peripheral surface of which is formed in the shape of the outer shape of the container to be manufactured.

2 is a resin injection pipe provided at the lower part of the outer mold 1, and has a valve 3.

Numeral 4 is a glass fiber fabric, and a plurality of these fabrics are laid one on top of the other on the inner surface of the outer mold 1.

Reference numeral 5 denotes an inner mold (mold), the outer peripheral surface of which is formed in the shape of the inner shape of the container, and the inner mold 5 shown in the figure is a lower mold 5.
a and an upper airtight sheet 5b,
The airtight sheet 5b is made of a rubber or resin sheet and extends above the mold 5a from the lower surface of the lower mold 5a, and its peripheral edge 5c covers the upper peripheral edge 1a of the outer mold 1 described above.

A pressure ring 7 is pressed from above on the peripheral edge 5c of the airtight sheet 5b via the annular rubber body 6 to seal the space between the inner and outer molds 5 and 1, and this sealed chamber 8
The above-mentioned polymerized glass fiber fabric 4 is embedded in the fiberglass fabric.

Reference numeral 9 denotes a suction pipe, which is connected to a vacuum pump 10, with one end of the suction pipe 9 communicating with the above-mentioned sealed chamber 8 via a valve 11, and the other end communicating with a tank 12 via the vacuum pump 10. ing.

With the configuration as described above, the vacuum pump 10 is operated to suck the sealed chamber 8 through the suction pipe 9,
After creating a negative pressure state, the valve 3 is opened and the unsaturated polyester resin solution is injected into the sealed chamber 8 from the injection pipe 2, and the resin solution is poured into the polymerized glass fiber fabric 4.
and repeat vacuum operation and resin injection several times as necessary.

In the above-described negative pressure injection of the resin solution, the atmospheric pressure applied to the entire surface of the inner frame 5 due to the negative pressure presses the product inside, resulting in significant strength.

In the above-described embodiments, the means for injecting resin after vacuum operation has been described, but this vacuum operation and resin injection may be performed simultaneously.

In addition, as shown in FIG. 2, the above-mentioned vacuum means
Suction may be applied from a plurality of locations on the upper periphery of the container, and depending on the shape of the container, the injection location may be selected at a desired position as shown in FIG.

Note that the glass fiber material 4 is composed of a nonwoven fabric, a woven fabric, a knitted fabric, a braided fabric, or the like made of glass fiber.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, FIG. 1 is a schematic sectional view of a large container manufacturing apparatus, FIG. 2 is an explanatory diagram showing another example, and FIG. 3 is an explanatory diagram showing another example. be. 1... Outer mold, 4... Glass fiber fabric, 5... Inner mold, 5b... Airtight sheet, 8... Sealed chamber, 10
……Vacuum pump.

Claims (1)

[Scope of Claims] 1. A glass fiber material is laid to a predetermined thickness in a formwork in which either the inner peripheral surface or the outer peripheral surface is formed in the shape of the corresponding peripheral surface of the container, and the outer peripheral surface is covered with an airtight sheet. The glass fiber material is sealed by covering it with material, and the inside of this sealed chamber is suctioned with a vacuum pump.
A method for manufacturing a large container characterized by injecting a resin liquid using a suction negative pressure pump to impregnate a glass fiber material with the resin liquid. 2. The method for manufacturing a large container according to claim 1, in which vacuum operation and resin liquid injection are repeated several times. 3. A method for manufacturing a large container according to claim 1, in which vacuum operation and resin liquid injection are performed simultaneously. 4. A method for manufacturing a large container according to claim 1, wherein resin liquid is injected after vacuum operation. 5. The method for manufacturing a large container according to claim 4, wherein the vacuum operation is performed again after the resin liquid is injected.