JPH11321937A - Pressure regulation valve and packaging body having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically and safely regulate the pressure in a process even when the heating treatment is effected without taking any action in advance by storing a diaphragm valve in a receiving pan so that a pressing part is pressed against a recessed part of the receiving pan in a mutually airtight manner. SOLUTION: In a pressure regulating valve, a diaphragm valve 3 is stored in a receiving pan 2 so that a pressing part 31 of the diaphragm valve 3 is pressed against a recessed part 21 of the receiving pan 2 in a mutually airtight manner. In the receiving pan 2, a large number of fine through holes 22 are provided in the recessed part 21 of a center part, and a flange part 23 slightly expanded inward as necessary is provided on an upper edge of an opening. In the pressure regulating vale, when a silicone oil is interposed in a pressed part between the recessed part 21 of the receiving pan 2 and the pressing part 31 of the diaphragm valve 3, the airtightness is improved to minimize the degradation of a content during the storage of a packaged body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure regulating valve and a package with a pressure regulating valve suitable for microwave heating.

[0002]

2. Description of the Related Art Today, various types of cooked foods are aseptically packaged in plastic containers and sold on the market. Many of these foods are heated before being served. As for the heating method, there are a boiling method in which the package is left in hot water and a microwave heating method in which the packaging material can be heated in a microwave without including an electromagnetic wave reflecting layer in the composition. In particular, cooked foods of the microwave heating type are most welcomed by consumers because they can be easily heated and eaten.

[0003] Heretofore, there has not been a package in which an unfamiliar elderly person or the like can heat a microwave oven with ease.

[0004] Here, the procedure will be described by taking as an example a case where "rice" sealed in a tray is heated using a microwave oven. Generally, however, the corners of the tray are slightly opened beforehand. After all, measures have been taken to pinch the top lid film with a pointed object to form some openings. This is for discharging steam generated from "rice" to the outside of the package as the temperature rises. If this measure is neglected, the package may burst and be extremely dangerous.

[0005] That is, a package suitable for heating in a microwave oven includes not only an electromagnetic wave reflection layer such as an aluminum foil but also a complete sealing property and an easy opening property (opening property) in addition to not including at least an electromagnetic wave reflection layer such as an aluminum foil in the composition of the packaging material. To satisfy the conflicting demands of having the same).

[0006]

SUMMARY OF THE INVENTION The present invention pays particular attention to its easy opening property (opening property), and slightly opens the corners of the tray before heating the microwave oven as in the above-mentioned conventional technique. There is no need to take measures such as holding the top lid film with a pointed object and making several openings, that is, even if the heat treatment is performed as it is, it will be automatic and safe in the process. An object of the present invention is to provide a pressure regulating valve and a package with the pressure regulating valve which can regulate the pressure.

[0007]

Means for Solving the Problems A first invention of the present invention is:
A diaphragm valve 3 having a central pressing part 31 and a vent hole 32 arranged on the outer side of the central part is provided with a diaphragm valve 3 having a plurality of fine through-holes 22 in a central concave part 21. The pressure regulating valve 1 is characterized in that the pressing portion 31 of the diaphragm valve 3 is housed in the airtight member 21 so as to be pressed against each other in an airtight manner.

According to a second aspect of the present invention, the pressure adjusting valve mounting window 42 provided in the package 4 is pressed into the tray 2 having a large number of fine through holes 22 in the central recess 21 so as to press the central portion. A diaphragm valve 3 having a portion 31 and a vent hole 32 arranged on the outer side thereof is provided with a pressure adjustment in which the pressing portion 31 of the diaphragm valve 3 is housed in the concave portion 21 of the tray 2 so as to be pressed against each other in an airtight manner. It is a package with a pressure regulating valve, wherein the valve 1 is attached.

Further, the present invention is the pressure regulating valve 1 according to the first aspect of the present invention, in which silicone oil is interposed in a pressure contact portion between the concave portion 21 of the tray 2 and the pressing portion 31 of the diaphragm valve 3.

The present invention is also provided with a pressure control valve according to the second invention, wherein the pressure control valve 1 in which silicone oil is interposed at a pressure contact portion between the concave portion 21 of the tray 2 and the pressing portion 31 of the diaphragm valve 3 is attached. It is a package.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A pressure regulating valve and a package with a pressure regulating valve according to the present invention will be described in detail below based on one embodiment. FIG. 1 is a schematic diagram for explaining the structure of a pressure regulating valve portion of a package with a pressure regulating valve of the present invention in an unheated state, in which (a) is a schematic perspective view and (b) is a cross-sectional view. It is a schematic diagram. FIG. 2 is a schematic diagram illustrating the structure of the pressure regulating valve portion in a heated state of the package with the pressure regulating valve of the present invention, showing a state where the inside of the package communicates with the outside (outside world) of the package. (A) is a schematic perspective view,
(B) is a schematic view in cross section. FIG. 3 is a schematic perspective view of a package with a pressure regulating valve of the present invention. Figure 1
In FIG. 3, 1 is a pressure regulating valve, 2 is a tray, 21 is a concave portion, 22 is a fine through hole, 23 is a flange portion, 3 is a diaphragm valve, 31 is a pressing portion, 32 is a vent, 4 is a package,
41 is a package side, and 42 is a pressure adjusting valve mounting window.

The pressure regulating valve 1 is configured such that a diaphragm valve is housed in a receiving pan so that the pressing portions of the diaphragm valve are pressed against each other in an airtight manner in a concave portion of the receiving pan.

The tray 2 is provided with a large number of fine through-holes in a central concave portion, and a rigid short cylindrical plastic molded product having a flange portion which is also provided on the upper edge of the opening as needed to slightly protrude inward. The diaphragm valve is housed inside the recess so that the pressing portions of the diaphragm valve are pressed against each other in the recess of the tray in a gas-tight manner.

The recess 21 is formed by cutting the center of the bottom of the tray from the inside, and has a number of fine through holes formed therein.

The fine through-holes 22 are a large number of fine through-holes formed in the concave portion of the pan, and these are closed with a certain pressure by the pressing portion of the diaphragm valve.

The flange portion 23 is provided so as to protrude slightly inward along the upper edge of the opening of the pan, and in the case of internal attachment, the flange portion 23 is adhered to the package body side. The portion of the flange portion that slightly protrudes inward functions as a stopper for the accommodated diaphragm valve.

The diaphragm valve 3 is a flexible polymer molded article having a substantially "M" cross section, and has a pressing portion at the center and several ventilation holes arranged on the outer side thereof. The pressing portions of the diaphragm valve are housed in the recesses of the receiving tray so as to be in airtight contact with each other.

The pressing portion 31 forms a central portion of the diaphragm valve, and its outer surface has a curvature approximated so as to be in airtight contact with the concave portion of the tray, and is thinner toward the center thereof.

The ventilation holes 32 are several through holes formed on the outer periphery of the pressing portion, and serve as passages for discharging water vapor and the like that have pushed up the pressing portion of the diaphragm valve through the fine through holes to the outside. .

The package 4 is basically made of plastic and can cover almost all existing sealed packaging forms such as pouches, rocket packaging, deep drawing packaging, tray packaging, cup packaging and the like. As a kind of plastic, polypropylene is most commonly used as a heat-resistant resin, and polypropylene is often used because it is easy to add functions such as sealing by heat sealing and easy-opening properties. The heat resistance of this resin can be further improved (about 20%) by adding an inorganic filler.

The package body side 41 refers to the pressure regulating valve forming surface of the package body, has a pressure regulating valve mounting window at a predetermined location, and it is sufficient if there is no inconvenience in bonding and fixing the pressure regulating valve to be adhered.
This may be a flexible film surface or a surface showing some rigidity.

The pressure adjusting valve mounting window 42 is a circular window or the like formed on the package body side. The window 42 covers the pressure adjusting valve mounting window 42 at the bottom of the receiving pan when the pressure adjusting valve is externally mounted. In this case, the upper surface of the flange portion is adhered to the package body side.

In the pressure regulating valve 1 of the present invention, when the internal pressure of the package becomes equal to or higher than a predetermined value due to the increase of the internal pressure due to the temperature rise, the pressing portion 31 of the diaphragm valve 3 that closes the fine through hole 22 is pushed up. As a result, the airtightness is released to form a gap, and the inside of the package communicates with the outside world. Then, when the internal pressure decreases, the diaphragm valve returns and airtightness is maintained again. Further, in the pressure regulating valve 1 of the present invention, the concave portion 21 of the pan 2 and the pressing portion 3 of the diaphragm valve 3
In the case where silicone oil was interposed in the press-contact portion between the two, airtightness was further improved, and deterioration of contents during storage of the package could be minimized.

In the package with a pressure regulating valve according to the present invention, when the internal pressure of the package becomes equal to or higher than a predetermined value due to the increase of the internal pressure due to the temperature rise, the fine through hole 22 is formed.
The pressure portion 31 of the diaphragm valve 3 that closes the airtight box is pushed up, airtightness is released, a gap is created, and the inside of the package communicates with the outside world.
Unnecessary measures such as opening the corners of the tray a little in advance, or piercing the top lid film with a sharpened object and making several openings are not necessary, so unfamiliar elderly people etc. Even if processed, safety is ensured.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A package with a pressure regulating valve according to the present invention will be described in detail with reference to specific embodiments.

<Example 1> Outside the pressure adjusting valve mounting window provided at the corner of the pillow-packed pillow bag made of polypropylene film on the side of the package (for example, the side opposite to the wrapped together), in the central recess. A rubber-made elastomer diaphragm valve having a central pressing portion and a ventilation hole disposed on the outer periphery of the pressing portion of the diaphragm valve is provided in a receiving plate having a large number of fine through holes. Were attached so as to be pressed against each other in an airtight manner to obtain a packaging bag. The content of “rice” was aseptically packaged in the packaging bag obtained here, and they were subjected to a microwave heating experiment (the temperature of rice was set to an appropriate temperature, ie, 93 to 98 °).
C), but when the internal pressure of the package becomes higher than a preset value due to the increase of the internal pressure due to the temperature rise, the pressing portion of the diaphragm valve that closes the fine through hole is pushed up for all the specimens. As a result, the airtightness was released to form a gap, and the inside of the package communicated with the outside world. Due to this, the inside of the package was opened to the outside world, and none of the water vapor excessively generated in the package was discharged to the outside of the package along the route secured here and burst.

[0027]

According to the present invention, the package with the pressure regulating valve to which the pressure regulating valve is attached has a large number at the center of the pan when the internal pressure of the package becomes a predetermined value or more due to the increase of the internal pressure due to the temperature rise. The pressing portion of the diaphragm valve that closes the provided fine through-hole is pushed up to release the airtightness and to form a gap so that the inside of the package communicates with the outside (outside world) of the package. As a result, the inside of the package is opened to the outside (outside world) of the package, and the excessively generated water vapor inside the package is discharged to the outside of the package along the route secured here. There was none. Excessive water vapor generated inside the package is discharged to the outside of the package along the route secured here (that is, the location and direction of the vapor discharge are regulated and safe). As a result, the internal pressure of the package almost reaches the equilibrium with the atmospheric pressure, and the burst of the package is avoided. That is, in the present invention, in the package with a pressure regulating valve fitted with a pressure regulating valve suitable for microwave oven heating, when heating the microwave oven, the corner of the tray may be opened a little in advance, or the top cover film may be removed. Since it is not necessary to take measures such as providing several openings with a sharp-pointed object, safety is ensured even if an unfamiliar elderly person or the like directly heat-treats.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining the structure of a pressure regulating valve in a non-heated state of a package with a pressure regulating valve of the present invention;
(A) is a schematic perspective view, and (b) is a schematic sectional view.

FIG. 2 is a schematic diagram illustrating a structure of a pressure regulating valve portion in a heated state of the package with a pressure regulating valve of the present invention, showing a state where the inside of the package communicates with the outside (outside world) of the package;
(A) is a schematic perspective view, and (b) is a schematic sectional view.

FIG. 3 is a schematic perspective view of a package with a pressure regulating valve of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pressure adjustment valve 2 ... Receiving tray 21 ... Concave part 22 ... Fine through-hole 23 ... Flange part 3 ... Diaphragm valve 31 ... Pressing part 32 ... Vent hole 4 ... Packaging 41 ... Packaging side 42 ... Pressure adjustment valve mounting window

Claims (3)

[Claims] 1. A diaphragm provided with a central pressing portion and a vent disposed on an outer side thereof in a tray provided with a large number of fine through holes in a central concave portion. A pressure regulating valve, wherein the pressure regulating valves are housed so as to be in pressure contact with each other. 2. The pressure regulating valve according to claim 1, wherein a silicone oil is interposed in a pressure contact portion between the concave portion of the tray and the pressing portion of the diaphragm valve. 3. A package with a pressure regulating valve, wherein the pressure regulating valve according to claim 1 or 2 is attached to a pressure regulating valve mounting window provided in the package.