JP2003075279A - Simple atmospheric pressure detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple atmospheric pressure detector capable of easily and certainly recognizing the generation of a pinhole and usable in a package or the like exerting no adverse effect on a material to be packaged by the presence of a pinhole detector. SOLUTION: The simple atmospheric pressure detector is constituted so as to be capable of easily sensing a change in atmospheric pressure on an opening side by combining a cylinder hermetically closed at one end thereof and opened at the other end thereof and the slider slidable in the cylinder.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a device for easily detecting atmospheric pressure.

[0002]

2. Description of the Related Art In order to protect a substance that is easily adversely affected by oxygen in the air or a substance that easily releases a component gas or the like into the air, it is necessary to hermetically package a flexible gas impermeable packaging material. It is being appreciated. These packages may sometimes lose their original purpose due to pinholes generated during the transportation process, and it is necessary to detect the presence or absence of pinholes easily and reliably. As a remedy for this, conventionally, a plastic container containing a hydrogen carbonate containing a chemical solution is wrapped with a packaging material having a high gas barrier property, and an oxygen scavenger and an oxygen detector are stored in the space between the container and the packaging material, and A container (Japanese Unexamined Patent Publication (Kokai) No. 8-164185) in which this space is made to have a substantially oxygen-free gas atmosphere, or a package in which a carbon dioxide-generating oxygen absorber is placed in place of such an oxygen absorber ( Patent 2
505329) and a package (WO97 / 48365) in which a pH indicator is enclosed in the space between the container and the packaging material are known. However, these are not sensitive to discoloration when pinholes occur, are difficult to distinguish easily if they are not used, and the space between the container and the package is oxygen-free and has a carbon dioxide gas atmosphere. Therefore, there are problems that the composition of the chemical liquid is adversely affected, and that the oxygen scavenger and the oxygen detector become expensive.

[0003]

DISCLOSURE OF THE INVENTION The present invention overcomes the problems of these conventional techniques, and can easily and surely recognize the occurrence of pinholes. The present invention provides a simple atmospheric pressure detection tool that can be used for a package or the like that does not adversely affect the package.

[0004]

SUMMARY OF THE INVENTION The present invention comprises a cylinder and a slider capable of sliding in the cylinder, one end of the cylinder is hermetically sealed, and the other end is a slider that is built in and slides. It has been found that the above-mentioned problems can be solved by using a simple atmospheric pressure detector characterized by being opened to such an extent that it does not fall off.

That is, 1. It is composed of a cylinder and a slider that can slide in the cylinder. One end of the cylinder is sealed, and the other end is open to the extent that the built-in / sliding slider does not fall off. Simple atmospheric pressure detector, 2. 2. A simple atmospheric pressure detector according to claim 1, characterized in that a standard of atmospheric pressure is written on the cylinder. 3. A simple atmospheric pressure detector according to claim 1 or 2, wherein a part of the cylinder is transparent so that the slider can be observed from outside the cylinder. 4. The simplified barometric pressure detector according to claims 1 to 3, wherein the slider is clearly colored. 5. The simplified atmospheric pressure detector according to any one of claims 1 to 4, wherein the cross section of the slider is a circle or an ellipse. The simple atmospheric pressure detection tool according to claim 1, wherein the tubular body having a built-in tube has a flat outer cross-section.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described with reference to the drawings.
1 to 3 are schematic diagrams showing the principle of the present invention. One end 5 of a cylinder 1 is sealed, and a slider 2 and a sealing port 5 are a closed system 3.
Has become. The other end 6 is open to the extent that the built-in / sliding slider 2 does not fall off, forming an open system.
When such a simple atmospheric pressure detector is placed under pressure, the slider moves to the right in the figure, that is, the capacity of the closed system decreases, and when placed under reduced pressure, the slider moves to the left in the figure, that is, Move to increase the capacity of the closed system. Therefore, as shown in FIG. 1, if the scale 4 and other marks are provided on the cylinder, it is possible to detect the change in atmospheric pressure in the open system portion of the atmospheric pressure detector.

For example, as shown in FIG. 4, the opaque portion 7 of the cylinder
The transparent portion 8 may be provided so that the slider 2 moves to the transparent portion when the atmospheric pressure in the open system portion increases. In this case, the change in atmospheric pressure may be recognized by coloring the slider with vivid red or blue.

The cross-sections of the cylinder 1 and the slider 2 may be of any shape as long as the slider slides smoothly due to changes in atmospheric pressure, but a circular or elliptical shape is convenient. Further, by devising the shape of the opening, for example, the tire air pressure can be easily measured. Such cylinders and sliders are made of, for example, plastic, glass, aluminum, iron,
Any material such as copper or the like may be used as long as it can be slid while keeping the cylinder and the slider airtight.

Further, in the case of detecting a pinhole in the case where the packaged object is hermetically packaged with a flexible gas impermeable packaging material, for example, as shown in FIGS. It is desirable to make the surface flat so that there is no space between the detector and the packaging material. Such a simple atmospheric pressure detecting device may be sealed at an arbitrary position, for example, it may be closely attached to the packaged object or may be hermetically packaged at a position apart from the packaged object. You may make it come to the space of the shoulder part of the to-be-packaged object produced at the time of hermetically packaging with an impermeable packaging material. Further, the packaging position of the atmospheric pressure detecting device may be designated by applying a material such as iron powder that is sensitive to magnetic force to the atmospheric pressure detecting device. In such a case, if a pinhole occurs and air enters between the packaged material and the packaging material, the atmospheric pressure of the open system of the simple atmospheric pressure detection tool changes and the slider moves, so You can know the occurrence.

The object to be packaged using the simple atmospheric pressure detecting device of the present invention is easily affected by oxygen in the air,
It is a substance that easily emits component gases and the like into the air to be deteriorated.
In addition, it can be used together with a specific gas component to maintain the freshness of vegetables and fruits, or to promote or suppress ripening. These are due to the occurrence of pinholes
It may not be able to achieve its original purpose and may become unusable or may become rotten.

In this case, the object to be packaged and the simple atmospheric pressure detector are
Pinholes can be detected by sealing and wrapping them in different positions so that they do not move, or by sealing the packaged object and the simple atmospheric pressure detector side by side. In these cases, a flexible material is preferable in order to reduce the area that cannot be sealed as much as possible. Further, as shown in FIG. 12, a seal band 11 may be provided between the simple detection tool and the article to be packaged, in which a ventilation passage having a width such that the simple detection tool cannot move toward the article to be packaged is left. In this case, when a pinhole is generated, the change in atmospheric pressure can be detected, but the simple detection tool does not enter the portion to be packaged.

[0012]

As described above, the simple atmospheric pressure detecting device of the present invention can detect a change in atmospheric pressure with a simple structure. For example, it is easy to detect a pinhole in a vacuum package and cut off. Regardless of the type of gas you want to use, it is not necessary to replace the inside of the packaged body with an inert gas, etc., and no complicated and expensive substances such as oxygen detectors and pH indicators are used, so it is easy, inexpensive, and reliable Pinholes can be detected. Moreover, if a detecting tool that is sensitive to magnetic force is used, the detecting tool can be easily enclosed at a predetermined position.

[Brief description of drawings]

FIG. 1 is a simple detection tool of the present invention.

FIG. 2 is a simple detection tool of the present invention at the time of pressurization.

FIG. 3 is a simple detection tool of the present invention when decompressing.

FIG. 4 is an application example 1 of the present invention.

[Fig. 5] Example of slider movement when a pinhole occurs

FIG. 6 is a side view of an application example 2 of the present invention (a detection tool for hermetic packaging).

FIG. 7 is a plan view of application example 2 of the invention.

FIG. 8 is a sectional view taken along line AA ′ of the side view of the application example 2 of the invention.

FIG. 9 is a cross-sectional view taken along the line BB ′ of the plan view of Application Example 2 of the invention.

FIG. 10 is a plan view of a slider of Application Example 2 of the invention.

FIG. 11 is a cross-sectional view taken along the line AA ′ of the slider of Application Example 2 of the invention.

FIG. 12: Example of hermetically packaging with a flexible packaging material

[Explanation of symbols]

1 tube 2 slider 3 closed system 4 scale 5 Sealing mouth 6 opening 7 Opaque part of the cylinder 8 transparent parts 9 cylinder 10 seal parts 11 seal belt 12 Simple atmospheric pressure detector 13 Package

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2F055 AA12 BB19 CC06 DD01 DD07                       DD11 EE01 FF05 GG03 GG11                 2G067 AA44 BB32 CC01 DD14                 3E067 AB08 AB09 AB99 BA03B                       BA12C BC03B BC03C BC07B                       CA10 EA09 EE60 FA01 FB11                       FC01 GD10

Claims (6)

[Claims] 1. A cylinder and a slider capable of sliding in the cylinder, wherein one end of the cylinder is sealed, and the other end is opened to the extent that a slider that is built in and slides does not fall off. A simple atmospheric pressure detector characterized in that 2. The simple atmospheric pressure detector according to claim 1, wherein a standard of atmospheric pressure is written on the cylinder. 3. A part of the cylinder is transparent so that the slider can be observed from the outside of the cylinder.
Simple atmospheric pressure detector. 4. The simple atmospheric pressure detector according to claim 1, wherein the slider is clearly colored. 5. The simple atmospheric pressure detector according to claim 1, wherein the cross section of the slider is a circle or an ellipse. 6. A simple barometric pressure detecting tool according to claim 1, wherein the outer shape of the tubular body having the built-in barrel is flat in cross section.