JPH06293369A - Pressure-resistant container - Google Patents

Abstract

PURPOSE:To prevent fire arising from concave mirror effect of a concave bottom of a pressure-resistant container by a method wherein light reflection reducing treatment for forming a low reflectance coat is applied to the surface of the concave bottom. CONSTITUTION:A low reflectance coat 10 is formed to the surface of a concave bottom 7. The low reflectance coat 10 is formed over the surface of the concave bottom 7 with paint, dye, pigment, ink or the like in low reflectance color such as black by well-known method of coating or printing. The low reflectance coat 10 is formed partly, for instance in island shapes, over the surface of the concave bottom 7. In the case where the low reflectance coat 10 is formed over the surface of the concave bottom 7, the amount of light reflectance over the surface of the concave bottom 7 can be reduced by the low reflectance coat 10 and the amount of light convergence on the focal point of the concavity is also reduced. Therefore, concave mirror effect arising from the surface of a concave bottom in high reflectance can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various pressure resistant containers whose inside is used under high pressure, and more particularly to a pressure resistant container having a concave bottom.

[0002]

2. Description of the Related Art Conventionally, pressure-resistant containers of this type include various spray cans containing paints, insecticides, etc., beverage cans containing carbonated beverages, or various gas cylinders containing liquefied gas for fuel or liquefied gas for refrigerant. Etc.

FIG. 4 is a cross-sectional view of the main parts of the pressure-resistant container with the upper part omitted. The pressure-resistant container 4 has a structure in which a cylindrical container side portion 6 made of a thin steel plate and a concave bottom portion 7 are airtightly fixed to each other. Further, when the pressure-resistant container 4 is formed of a material capable of deep drawing such as aluminum or stainless steel, the container side portion 6 and the concave bottom portion 7 are integrally processed. Since these pressure-resistant containers 4 are used in a state where the internal pressure is equal to or higher than the atmospheric pressure, the pressure-resistant structure for supporting the pressure inside the container is formed by forming the bottom portion in a concave shape in this way.

On the surface of the concave bottom portion 7, the surface of the thin steel plate or the like, the plated surface applied to the surface of the thin steel plate, aluminum, stainless steel, etc. are exposed as they are,
It looks like a so-called concave mirror.

[0005]

In these pressure-resistant containers 4, when the concave bottom portion 7 is irradiated with a light ray 8 such as sunlight or an infrared lamp, the light ray 8 reflected by the surface of the concave bottom portion 7 is a concave surface. It is focused on the focal point 9 of. When a combustible material such as paper is present at a position close to the focal point 9, there is a risk that the combustible material will be ignited by the condensed light beam 8 and a fire will occur.

For example, in a waste treatment facility or the like, it has been reported that a suspicious fire whose cause is unknown occurs when combustible substances such as paper scraps are mixed in non-combustible substances including the pressure resistant container. It is presumed that some of these are due to the so-called concave mirror effect, which is the concentration of sunlight by the concave bottom surface of the pressure vessel.

An object of the present invention is to solve the above-mentioned inconvenience due to the formation of the concave bottom of the pressure vessel.

[0008]

In order to solve the above-mentioned problems, the pressure-resistant container according to claim 1 of the present invention is characterized in that the concave bottom portion is subjected to a light reflection reducing treatment. Claim 2
In the pressure resistant container of No. 3, the light reflection reducing treatment is characterized in that a low reflectance coating is formed on the surface of the concave bottom portion. In the pressure-resistant container according to claim 3, the light reflection reducing process is characterized in that a convex portion is formed on the surface of the concave bottom portion. In the pressure-resistant container according to claim 4, the light reflection reduction treatment is roughening of at least a part of the surface of the concave bottom portion.

[0009]

By performing light reflection reduction processing on the concave bottom, the amount of light collected at the focus of the concave surface of the concave bottom is reduced, and temperature rise at the focus is prevented. When the light reflection reduction process is performed by forming the low reflectance coating, the amount of light rays reflected on the surface of the concave bottom portion is reduced, and the amount of light condensed at the focal point of the concave surface is reduced. Further, in the case where the light reflection reduction process is performed by forming a convex portion or roughening at least part of the surface,
The reflection directions of light rays on the surface of the concave bottom are dispersed, and the amount of light collected at the focal point of the concave surface is reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First to third embodiments of the present invention will be described below with reference to the drawings. In the drawings for explaining the embodiments, the same parts as those in FIG. 4 for explaining the conventional technique are designated by the same reference numerals, and the duplicated description thereof will be omitted.

First, the pressure resistant container of the first embodiment realizes claim 2, and is based on the sectional view of the main part of FIG. 1 (a) and the plan view of the concave bottom part of FIG. 1 (b). Explain.
The characteristic feature of the pressure resistant container 1 of the first embodiment is the low reflectance coating 10 formed on the surface of the concave bottom portion 7. The low reflectance coating 10 is formed, for example, by painting or printing a low reflectance paint such as black, a dye, a pigment or an ink on the surface of the concave bottom portion 7 by a known method.

In addition to the above, the low reflectance coating 10 may be formed by bonding or heat-sealing a vinyl tape or a plastic tape having a separately prepared adhesive layer to the concave bottom portion 7. Furthermore, the low reflectance coating 10 may be formed by electrostatic flocking of short fibers or the like, thermal spraying of ceramic powder, black plating, or the like.

FIGS. 1A and 1B show the case where the low reflectance coating 10 is formed in an island shape on a part of the surface of the concave bottom portion 7. However, the low-reflectance coating 10 has, for example, a lattice shape, over the entire surface of the concave bottom portion 7 or over the entire surface.
It may be formed in a stripe shape.

When the low-reflectance coating 10 is formed on the surface of the concave bottom portion 7 as described above, the low-reflectance coating 10 reduces the amount of light rays reflected on the surface of the concave bottom portion 7, thereby reducing the focus of the concave surface. The amount of light collected at is reduced.

Next, the pressure resistant container of the second embodiment realizes claim 3, and is shown in the sectional view of the main part of FIG. 2 (a) and the plan view of the concave bottom part of FIG. 2 (b). It will be explained based on.
The characteristic feature of the pressure resistant container 2 of the second embodiment is the convex portion 20 formed on the surface of the concave bottom portion 7. This convex portion 20
For example, one to a plurality of circular convex portions 20 are formed on the surface of the concave bottom portion 7.

2A and 2B, the circular convex portion 20
The case where a plurality of layers are formed is shown. However, the shape of the convex portion 20 is not limited to this, and may be a rectangular shape or the like.

As described above, the convex portion 2 is formed on the surface of the concave bottom portion 7.
When 0 is formed, the concave bottom 7 is formed by the convex 20.
The direction of reflection of the light rays on the surface of is dispersed, and the amount of light collected at the focal point of the concave surface is reduced.

The pressure resistant container of the third embodiment realizes claim 4, and will be described with reference to the sectional view of the essential part of FIG. The characteristic features of the pressure resistant container 3 of the third embodiment are as follows.
The rough surface 30 is formed on at least a part of the surface of the concave bottom portion 7. The rough surface 30 is formed on the surface of the concave bottom 7 by, for example, blasting sand, glass beads, etching, coining, or the like.

In FIG. 3, the rough surface 30 is shown as a concave bottom portion 7.
It shows the case where it was formed all over the surface of. However, the rough surface 30 has, for example, a lattice shape over the entire surface of the concave bottom portion 7.
It may be formed in stripes or islands.

As described above, the surface of the concave bottom 7 is roughened 3
When set to 0, the rough surface 30 disperses the reflection direction of the light beam on the surface of the concave bottom portion 7, and the amount of light condensed at the focus of the concave surface is reduced.

In the above-described first to third embodiments, when the identification characters such as the manufacturing date and product code are printed on the surface of the concave bottom portion 7, the concave bottom portion 7 is reflected on the surface. An empty area for rate reduction processing is provided, and identification characters such as manufacturing date, product code, etc. are printed in this empty area.

[0022]

As described in detail in the above embodiments, according to the pressure resistant container of the present invention, the amount of reflection of light rays on the surface of the concave bottom portion is reduced or the reflection direction of light rays is dispersed. The amount of light collected at the focal point of is reduced. Therefore, it is possible to avoid or reduce the so-called concave mirror effect, that is, light collection based on the surface of the concave bottom portion having high reflectance, and accidental fire or the like is prevented. Further, in order to obtain the effect of the present invention, it is sufficient to perform the reflectance reduction treatment only on the concave bottom portion of the pressure-resistant container, and the pressure-resistant container main body does not need to be changed in design, which can be achieved at low cost. Further, it is also possible to print identification characters such as the date of manufacture and the product code as in the conventional case.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment.

FIG. 2 is a diagram showing a second embodiment.

FIG. 3 is a diagram showing a third embodiment.

FIG. 4 is a diagram showing a conventional example.

[Explanation of symbols]

 1,2,3 Pressure-resistant container 6 Container side part 7 Concave bottom part 10 Low reflectance coating 20 Convex part 30 Rough surface

Claims (4)

[Claims] 1. A pressure resistant container having a concave bottom portion,
A pressure-resistant container, wherein the surface of the concave bottom portion is subjected to a light reflection reduction treatment. 2. The pressure resistant container according to claim 1, wherein the light reflection reduction treatment is formation of a low reflectance coating on the surface of the concave bottom portion. 3. The pressure resistant container according to claim 1, wherein the light reflection reducing process is a formation of a convex portion on the surface of the concave bottom portion. 4. The pressure-resistant container according to claim 1, wherein the light reflection reduction treatment is roughening of at least a part of the surface of the concave bottom portion.