JPH0212835B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lightweight, high-strength container and a method for manufacturing the same, and in particular to a cylindrical thin-film hollow body made of a thermoplastic synthetic resin while applying internal pressure to the container while interposing a honeycomb core around its outer periphery. By winding the reinforcing layer and heat-bonding it together, high strength can be obtained without increasing the weight of the container, and it can be manufactured at low cost.

This type of container is used as a storage container for liquids, powders, etc. loaded onto aircraft and ships.
As shown in Fig. 1, the structure of a conventional container is such that the inner layer is a synthetic resin sheet 1, the outer periphery is used as a reinforcing layer, and a fiber-reinforced synthetic resin 2 is adhered to the container body, and a cap 5 and a cover are attached to this container body. Ring 6 is attached.

The container body is formed by using a cylindrical paper-shaped or plaster-shaped core, and attaching synthetic resin sheets cut into appropriate sizes to the outer periphery of the core. It is manufactured by winding a reinforced synthetic resin as a reinforcing layer, heating and curing it, and removing a paper-shaped or plaster-shaped core after curing.

However, such conventional manufacturing methods
This method requires many steps to manufacture the core and cut the synthetic resin sheet into sections, which not only increases costs, but also involves cutting the synthetic resin sheet into sections and pasting them around the outer periphery of the core while forming the inner layer. However, this method has disadvantages in that it tends to have uneven thickness and wrinkles, and it is difficult to adhere it in a completely uniform shape.

In addition, since it is necessary to take out the core of the paper mold or plaster mold after molding and hardening, there is also the drawback that the base must be made large.

Furthermore, since the structure is simply a reinforcing layer wrapped around the outer periphery of the inner layer of the synthetic resin sheet and bonded, the shape is unstable and easily deforms when subjected to internal and external pressure, leading to problems in terms of strength. It was hot.

This invention was made to eliminate the above-mentioned drawbacks, and an object of the invention is to provide a container with high strength without increasing the weight; It is an object of the present invention to provide a lightweight, high-strength container that can be manufactured in a simple process, and a further object of the present invention is to significantly reduce the manufacturing cost of the lightweight, high-strength container.

That is, as shown in the illustrated embodiment, the present invention includes reinforcing layers 11 and 12 in which a cylindrical thin film hollow body 10 made of thermoplastic synthetic resin is used as an inner layer of a container body, and a honeycomb core 13 is interposed on the outer periphery of the inner layer. The first invention provides a lightweight, high-strength container characterized in that a cap 50 is attached to the outer peripheral surface of the container body, and a cover ring 60 is attached to both end surfaces. A step of blowing air into the interior of the cylindrical thin film hollow body 10 made of plastic synthetic resin from one of the hollow support shafts attached to both ends of the thin film hollow body 10 to apply internal pressure;
While rotating the thin film hollow body 10 to which internal pressure is applied around a hollow support shaft, a reinforcing layer 11 made of fiber-reinforced synthetic resin and a honeycomb core 13 are added to the outer periphery of the thin film hollow body 10.
and a reinforcing layer 12 made of fiber-reinforced synthetic resin are laminated and wound; and the container body formed by each of the above steps is heated and hardened to bond the thin film hollow body 10 and the reinforcing layers 11 and 12 together. A second invention provides a method for manufacturing a lightweight, high-strength container, which comprises sequentially carrying out the steps of 1) and then attaching a cap 50 and a cover ring 60 to the outer circumferential surface and both end surfaces of the container body, respectively.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a longitudinal sectional view showing an embodiment of the invention. In the figure, reference numeral 10 is a thin film hollow body made of thermoplastic synthetic resin, which forms the inner layer of the container. 11 and 12 are reinforcing layers made of fiber-reinforced synthetic resin, 13 is a honeycomb core sandwiched between the reinforcing layers 11 and 12, and the reinforcing layers 11 and 12 and the honeycomb core 13 are the outer layer of the container. It is becoming. 50 represents a base, and 60 represents a cover ring.

The inner layer 10 is formed into a cylindrical thin film hollow body having a wall thickness of 0.2 to 0.5 mm by inflating a thermoplastic synthetic resin. As the thermoplastic synthetic resin, an appropriate one is selected from, for example, ABS resin, polyethylene, vinyl chloride, and the like.

The reinforcing layers 11 and 12 are made of, for example, GFRP, which is glass fiber impregnated with a thermosetting synthetic resin such as epoxy resin, or Kevlar, roving, or the like impregnated with epoxy resin.

The honeycomb core 13 is preferably made of nylon impregnated with phenol resin or a non-metallic thin plate such as FRP, and is formed by bonding a large number of hexagonal columns with a thickness of 4 to 10 mm to form a honeycomb shape.

Next, the manufacturing process of the container having the above structure will be explained.

First, hollow support shafts (not shown) are attached to both ends of the cylindrical thin film hollow body 10 made of thermoplastic synthetic resin, and air is blown from one of the support shafts to apply internal pressure to the thin film hollow body 10. Inflate. The air pressure is within the range of 0.05 to 3.0 kg/cm ² depending on the thickness of the thin film hollow body 10.

Next, the reinforcing layer 11 made of fiber-reinforced synthetic resin is wound around the outer periphery of the thin film hollow body 10 to which internal pressure is applied while rotating at a constant speed around the hollow support shaft. At this time, the air pressure blown into the thin film hollow body 10 is gradually increased to prevent the thin film hollow body 10 from contracting due to the tension caused by the winding of the reinforcing layer 11. The reinforcing layer 11 can be wound by hoop winding, in which it is wound sequentially from one side end to the other end in the same circumferential direction of the thin film hollow body 10, or from above one side end of the thin film hollow body 10. One of the polar windings, which are wound diagonally downwards at the other end, is appropriately selected and used.

Next, a thin film hollow body 10 is placed around the outer periphery of the reinforcing layer 11.
A honeycomb core 13 having a width shorter than the entire length of the honeycomb core 13 is wound, and a reinforcing layer 12 made of fiber-reinforced synthetic resin is further wound around the honeycomb core 13, sandwiching the honeycomb core 13 therebetween.

After forming in this way, the thin film hollow body 10
While maintaining the internal pressure applied to the material, the material is heated and cured using a heating device.

Through this thermosetting, the thin film hollow body 10 and the fiber-reinforced synthetic resins 11 and 12 are bonded together to produce a container body.

Next, a cap 50 is attached to the outer peripheral surface of the container body.
The container of the present invention is completed by attaching cover rings 60 to the openings after removing the support shafts on both end faces.

In the illustrated embodiment, the cover ring 60 has a concavely curved shape on the inside of the container, but it may instead have a convexly curved shape on the outside of the container.

As explained above, in the container of the present invention, the container body has a cylindrical thin film hollow body made of thermoplastic synthetic resin as an inner layer, and a reinforcing layer sandwiching a honeycomb core is wound around the outer periphery of the inner layer. Constructed by heat bonding.

Therefore, according to the present invention, the reinforcing layer of the container body is made strong by the honeycomb core having high bending rigidity, so that the stability of the shape of the container is maintained and there is no buckling due to the barqueue. Moreover, since the weight of the honeycomb core is extremely light, it is possible to obtain a container that has high strength against internal and external pressure without substantially increasing the weight of the entire container.

In addition, the container of the present invention is produced by rotating a cylindrical thin-film hollow body made of thermoplastic synthetic resin around supporting shafts at both ends while applying internal pressure to the inside of the hollow body, and wrapping a reinforcing layer and a honeycomb core around the outer periphery of the hollow body. Since it is manufactured by spinning, there is no need for paper-shaped or plaster-shaped cores as in the past, and there is no need to divide and cut the synthetic resin sheet that forms the inner layer, so it can be manufactured in a simple process. Not only is it possible to significantly reduce manufacturing costs, but the inner layer has a constant thickness and does not wrinkle, making it possible to obtain a high-quality container.

Further, according to the present invention, there is no need to take out the core after molding and hardening, so there is an advantage that the base portion can be made smaller.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a conventional container, and Fig. 2 is a longitudinal sectional view of a conventional container.
FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the invention. In the figure, 10 is a thin film hollow body, 11 and 12 are reinforcing layers, 13 is a honeycomb core, 50 is a base, and 60 is a covering ring.

Claims (1)

[Scope of Claims] 1 A cylindrical thin film hollow body made of thermoplastic synthetic resin is used as an inner layer of a container body, and a reinforcing layer with a honeycomb core interposed is wound around the outer periphery of the inner layer and is heat-bonded together. A lightweight, high-strength container characterized by a cap attached to the outer circumferential surface of the main body and cover rings attached to both end surfaces. 2. The process of applying internal pressure by blowing air into the inside of a cylindrical thin film hollow body made of thermoplastic synthetic resin from one of the hollow support shafts attached to both ends of the thin film hollow body, and the process of applying internal pressure to the thin film to which the internal pressure is applied. a step of laminating and winding a reinforcing layer made of fiber-reinforced synthetic resin, a honeycomb core, and a reinforcing layer made of fiber-reinforced synthetic resin around the outer periphery of the hollow body while rotating it around a hollow support shaft; The container body formed in the step is heated and cured to bond the thin film hollow body and the reinforcing layer together. After that, a cap and a cover ring are respectively attached to the outer peripheral surface and both end surfaces of the container body. A method for manufacturing a lightweight, high-strength container characterized by attaching the container.