JPH11301743A - Pressure regulating valve and package with pressure regulating valve - Google Patents

Abstract

(57) [Summary] [PROBLEMS] When heating a microwave oven, it is not necessary to take a measure such as opening a corner of a tray in advance, that is, even if the heating process is performed as it is, it is automatically and safely performed in the process. It is an object of the present invention to provide a pressure regulating valve and a package with the pressure regulating valve, which can regulate the pressure in the container. A rubber plate is placed in a valve tray having a first ventilation hole in a central portion so as to cover the first ventilation hole, has a second ventilation hole at one end from above, and has a lower surface at the other end. Of the valve mechanism, in which the first ventilation hole is formed on the upper or lower surface as a sealing film from the upper or lower surface, and the whole or part thereof has an electromagnetic wave absorbing layer. To form a pressure regulating valve entirely sealed, and a package to which the pressure regulating valve is attached.

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 suitable for microwave oven heating and to a package basically made of plastic with a pressure regulating valve.

[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. In other words, a measure is taken in which the top lid film is pinched with a pointed object to form some openings. This is to discharge water vapor and the like generated from “rice” as the temperature rises out of the package.
If this is not done, the package can explode, which is 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. Must meet the conflicting demands of having

[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 valve (3) is placed in a valve tray (2) having a first ventilation hole (21) at the center portion so as to cover the first ventilation hole (21), and a second ventilation hole ( 41) and the first ventilation hole (21) of the valve mechanism having a lid (4) fitted with a valve retainer (42) on the lower surface of the other end portion is sealed from above or below. A pressure regulating valve (1) characterized in that the entire surface is sealed with a functional film piece (51) having an electromagnetic wave absorbing layer on the upper or lower surface as a piece (5), either entirely or partially.

According to the present invention, in the above-mentioned invention, a valve (3) is placed in a valve tray (2) having a first ventilation hole (21) at a center portion so as to cover the first ventilation hole (21). A first ventilation hole of a valve mechanism having a lid (4) having a second ventilation hole (41) at one end from above and a valve retainer (42) at the lower surface of the other end. (21) is sealed from above or below with a supporting film piece (52) as a sealed film piece (5), and a functional film piece having an electromagnetic wave absorbing layer on the upper or lower surface of the supporting film piece (52). (51) is a pressure regulating valve (1) laminated.

According to a second aspect of the present invention, the thin portion (53) is placed in a valve tray (2) having a thin portion (53) which is opened at the center to become a first ventilation hole (21). The valve (3) is placed so as to cover the second vent hole (4) at one end from above.
The function of the valve mechanism having the above (1) and fitting the lid (4) having the valve retainer (42) on the lower surface of the other end, with the electromagnetic wave absorbing layer on the upper or lower surface of the thin portion (53). A pressure regulating valve (1) characterized by attaching a conductive film piece (51).

[0010] The third invention of the present invention provides the package body side (61).
A pressure-regulating valve-equipped package (6) in which the pressure-regulating valve according to any one of claims 1 to 3 is mounted on a pressure-regulating valve mounting window (62) provided in (1).

Further, according to the present invention, there is provided a valve tray (2) having a first air hole (21) in a central portion or a thin portion (53) which is opened to become the first air hole (21). A valve (3) is placed so as to cover the first vent (21), and has a second vent (41) at one end from above,
A functional film piece (51) having an electromagnetic wave absorbing layer on the lower surface of the first ventilation hole (21) of a valve mechanism formed by fitting a lid (4) having a valve retainer (42) on the lower surface of the other end. A package (6) with a pressure regulating valve in which the attached pressure regulating valve (1) is attached to the outer surface of the package body side (61).

[0012]

According to the first aspect of the present invention, in the pressure regulating valve (1) and the package (6) with the pressure regulating valve, the valve tray (2) is provided.
A functional film piece (51) having an electromagnetic wave absorbing layer on the upper or lower surface as a sealing film piece (5) or a sealing film piece (5) from above or below the first ventilation hole (21) provided in the center of the device. 5) The upper or lower surface of the thin portion which becomes the first ventilation hole by sealing or opening the entire surface using the supporting film piece (52) in which the functional film piece (51) having the electromagnetic wave absorbing layer is laminated on the upper or lower face as 5). A functional film piece having an electromagnetic wave absorbing layer is attached to the package. When microwave heating of the package (6) is started, the electromagnetic wave absorbing layer of the functional film piece (51) efficiently converts electromagnetic wave energy. It absorbs and converts it into thermal energy, which causes this part to reach a very high temperature in a short time. The electromagnetic wave absorbing layer portion of the sealed film piece (5) whose entire surface is sealed from the upper side or the lower side of the first ventilation hole (21) in this way generates heat and the functional film piece (51) as well as the supporting film adjacent thereto. The plastic film forming the piece (52) and the package body side (61) is melted by the extremely high temperature and is thermally destroyed together with the rise in the internal pressure of the package body (6). One to an unspecified number of minute holes penetrating in the vertical direction are formed. When microwave heating of the package (6) is started, excess steam and the like generated from the article to be packaged are discharged out of the package through one or an unspecified number of micropores formed therein. The internal pressure of the package (6) is adjusted.

According to a second aspect of the present invention, in the pressure adjusting valve (1) and the package (6) with the pressure adjusting valve, the central portion is formed into a thin-walled portion (53) in the valve tray (2). And a valve (3) is placed over the thin portion (53), a second vent hole (41) is provided at one end from above, and a valve retainer (42) is provided at the lower surface of the other end. (4) A functional film piece (51) having an electromagnetic wave absorbing layer in whole or in part on the upper surface or lower surface of the valve mechanism from above or below the thin portion (53). The pressure-regulating valve (1) having the pressure-regulated valve attached thereto is attached to a pressure-regulating valve mounting window (62) provided on the package body side (61) or an arbitrary part on the package body side (61) (6). It is. Further, according to the present invention, in the above invention, the thin portion (53) in the center portion of the valve tray (2) has a rib (54) in a lattice shape or the like, and from the side opposite to the rib (54). A force adjusting valve (1) having a functional film piece (51) having an electromagnetic wave absorbing layer on the upper surface or lower surface is attached to a pressure adjusting valve mounting window (62) provided on the package body side (61). Or a package (6) with a pressure regulating valve attached to an arbitrary position on the package side (61). In the present invention, when the microwave heating of the package (6) is started, the electromagnetic wave absorbing layer of the functional film piece (51) efficiently absorbs the electromagnetic wave energy and converts it into heat energy. This causes this part to reach a very high temperature in a short time. In this manner, the functional film piece (51) having the electromagnetic wave absorbing layer on the upper surface or lower surface in whole or in part is not only the functional film piece itself but also the adjacent thin portion (53) or the package body side. Even the plastic film constituting (61) is melted and broken by this extremely high temperature, and in this portion, there are a large number of unspecified small holes penetrating in the thickness direction in conjunction with the rise in the internal pressure of the package (6). It will be formed. Excessive steam and the like generated from the packaged object by the microwave oven are discharged out of the package through an unspecified number of small holes formed therein, whereby the internal pressure of the package (6) is adjusted. It is. In the package (6) of the present invention, the thin portion (5) at the center portion inside the valve tray (2).
3) has a rib (54) in a lattice shape or the like, and the rib (54)
In the case where a pressure regulating valve (1) in which a functional film piece (51) having an electromagnetic wave absorbing layer is entirely or partially adhered to the upper or lower surface from the side opposite to the side where the pressure control is performed, a microwave oven is used. The thin portion (53) does not swell greatly due to heating, and the thin portion (53) is successively and efficiently destroyed between the ribs (54). As a result, the mesh formed by the rib (54) This prevents part of the packaged object from jumping out due to boiling.

The electromagnetic wave absorbing layer is not particularly limited as long as it efficiently generates heat in a high frequency range. Generally, the electromagnetic wave absorbing layer is a thin film layer of a conductive metal such as aluminum formed by a vacuum evaporation method or the like. A thin film layer made of a mixture containing a conductive metal as a main component, a thin film layer made of a magnetic material such as ferrite, and a thin film layer made of a ferroelectric material such as barium can be used.

Here, the case where the functional film piece (51) of the present invention generally has a case where the electromagnetic wave absorbing layer is a vacuum deposited layer of aluminum will be described. Its surface resistivity is about 0.4 to 8 Ω /. Square inch (about 700-
(Equivalent to about 40 ° thickness). For example, in the case of having a surface resistivity of about 4 Ω / square inch, 20 to 3 after starting the microwave heating (about 600 watts).
It has been confirmed that the temperature reaches 200 ° C. or higher within 0 seconds, and then the temperature rises in proportion to the passage of time.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. In the pressure regulating valve and the package with the pressure regulating valve of the present invention, both the package side and the pressure regulating valve are basically made of plastic. FIG.
FIG. 3 is a schematic perspective view of a pressure adjusting valve portion of the package with a pressure adjusting valve according to the first invention of the present invention. FIG. 2 is a schematic cross-sectional view of a portion along a line AA of the pressure regulating valve unit in FIG. (A) shows the case of a pressure regulating valve in which the first ventilation hole is entirely sealed from the lower side with a functional film piece having an electromagnetic wave absorbing layer on the whole, except for the pressure regulating valve mounting window (pressure regulating valve). (Because the valve mounting window is not formed). (B)
Shows the case of a pressure regulating valve in which the first vent hole is also sealed from the lower side, and a functional film piece having an electromagnetic wave absorbing layer over the entire surface is sealed from the lower surface with a partially laminated support film piece. Adhered to the adjustment valve mounting window. FIG. 3 is a schematic perspective view of a pressure regulating valve portion of a package with a pressure regulating valve according to a second invention of the present invention. FIG. 4 is a schematic cross-sectional view of a portion along a line AA of the pressure regulating valve unit in FIG. (A) shows the thin part,
This is a case in which a pressure adjusting valve using a thin valve receiving plate with a rib attached to the lower surface is adhered to the outside of the pressure adjusting valve mounting window with the flange portion of the valve receiving plate. In (b), the functional film is adhered to the lower surface of the thin film portion. In this case, the functional film is adhered to the package at the bottom of the valve tray adjacent to the package. FIG.
It is a perspective view schematic diagram of the package with a pressure regulation valve of the present invention. 1 to 5, 1 is a pressure regulating valve, 2 is a valve tray, 21 is a first ventilation hole, 22 is a flange portion, 3 is a valve,
4 is a lid, 41 is a second ventilation hole, 42 is a valve retainer, 5 is a sealing film piece, 51 is a functional film piece, 52 is a supporting film piece, 53 is a thin portion, 54 is a rib, 6 is a package, 6
Reference numeral 1 denotes a package body side, and 62 denotes a pressure adjusting valve mounting window.

The pressure regulating valve (1) is generally composed of a valve tray, a valve, a lid and a sealing film piece each having a circular shape in a plan view, and a pressure regulating valve mounting window provided on the package body side. With the flange portion, the outer surface of the pressure adjusting valve mounting window and the lower surface of the flange portion or the inner surface of the peripheral edge of the pressure adjusting valve mounting window and the upper surface of the flange portion are bonded.

The valve tray (2) is a dish-shaped plastic molded product having a first ventilation hole at the center, and a flange may be provided at the periphery.

The first ventilation hole (21) is an opening formed in the center of the valve tray, and is sealed from the upper or lower side by a sealing film piece or has a thin portion. When the sealing film piece or thin-walled part and the package side adjacent to it are thermally broken by the electromagnetic wave irradiation and the seal is released, the water vapor generated from the packaged object is discharged out of the package as a channel here. Become.

The flange portion (22) is provided as necessary on the peripheral portion of the valve tray, and is used for bonding to the package.

The valve (3) is formed of an elastic material such as rubber, and when the pressure in the package increases due to water vapor or the like generated from the package by microwave heating, the valve protrudes from the lower surface of the end of the lid. The part held by the holder acts as a valve with the fulcrum as a fulcrum, and the water vapor or the like is released to the outside. Further, when the microwave heating is completed, the inflow of the outside air is prevented to contribute to the long-term preservation of the packaged object again.

The lid (4) is a plastic molded article having a second ventilation hole at one end and a valve retainer on the lower surface at the other end. Is fixed.

The second vent hole (41) is a through hole formed at the end of the cover opposite to the valve retainer, and the sealing film piece or the thin portion and the side of the package adjacent thereto are heated by electromagnetic wave irradiation. When the package is broken and the hermetic seal is released, water vapor and the like generated from the article to be packaged are discharged out of the package as a channel here.

The valve retainer (42) is a projection provided on the lower surface of the end opposite to the second ventilation hole of the lid, and fixes the valve.

The sealing film piece (5) is composed of a functional film piece or a supporting film piece in which the functional film pieces are partially laminated, and is used for sealing the first vent from above or below. Things.

The functional film piece (51) is often made of a heat-resistant film such as a polyester film having an electromagnetic wave absorbing layer on the entire upper surface or lower surface or partially.

The support film (52) is a plastic film in which a functional film piece having an electromagnetic wave absorbing layer is entirely or partially laminated on the upper or lower surface.

In the second invention, the thin portion (53) is
This is a thin film part provided in the center of the valve tray, and the functional film piece and the package side adjacent to the functional film piece (when the functional film piece is adjacent to the package side) are thermally destroyed and sealed by electromagnetic wave irradiation. Is released, the water vapor and the like generated from the article to be packaged are discharged out of the package as a channel here. Further, if necessary, the ribs are formed in a lattice shape or the like on the thin film portion.

The rib (54) is a rib provided on one side of the thin portion in a lattice or the like as necessary, and is reinforced as a whole so that the thin film portion does not bulge significantly. The thin film portion is sequentially and efficiently destroyed between them, and as a result, the mesh formed by the ribs prevents a part of the packaged object from jumping out due to boiling.

The package (6) 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 the type of plastic, polypropylene is most commonly used as a heat-resistant resin, and polypropylene is often used because it is easy to add a function such as sealing property and easy open property by heat sealing. The heat resistance of this resin can be further improved (about 20%) by adding an inorganic filler.

The package body side (61) refers to the surface of the package body where the pressure regulating valve is adhered. If necessary, a pressure regulating valve mounting window may be provided at a predetermined location. It is sufficient if there is no inconvenience, and it may be a flexible plastic film surface or a surface showing some rigidity.

The pressure adjusting valve mounting window (62) is a circular window or the like provided at a predetermined position on the side of the package as necessary, and the pressure adjusting valve is adhered from outside or inside with a flange portion of the valve receiving plate. Is done.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The pressure regulating valve and the package with the pressure regulating valve of the present invention will be described in detail with reference to specific examples.

<Example 1> The first ventilation hole is provided inside a valve tray having a first ventilation hole at the center on the outside of the package body side (for example, the side opposite to the palming) of a pillow-packed pillow bag made of polypropylene film. The valve is mounted over the valve, and a second vent hole is provided at one end from above, and the first vent hole of the valve mechanism formed by fitting a lid having a valve retainer at the lower surface of the other end is fitted. From the bottom side, the electromagnetic wave absorbing layer (thickness 2
A pressure regulating valve, which was entirely sealed with a functional film piece having a vacuum deposition layer of aluminum (100 to 300 ° C.), was adhered with the flange portion of the valve tray to obtain a packaging bag. As a content, "rice" was aseptically packaged in the packaging bag obtained here, and they were subjected to a microwave heating experiment (approximately 2 minutes and 30 seconds at an output of about 600 watts, and the temperature of the rice was adjusted to an appropriate temperature, ie, 93 to 98 ° C). However, in all the specimens, when microwave heating of the package was started, the electromagnetic wave absorbing layer of the functional film piece efficiently absorbed electromagnetic wave energy and converted it into heat energy. In this way, this portion reaches a very high temperature in a short time, and not only the functional film piece which has completely sealed the first air hole but also the plastic film constituting the adjacent package body side, Both of them were melted by this extremely high temperature, and both were thermally destroyed together with the rise in the pressure inside the package. Micropores are formed. As a result, the inside of the package was opened to the outside world, and none of the excess steam generated in the package pushed up the valve along the path secured here and was discharged to the outside of the package and burst. Was.

<Example 2> A first through-hole is provided at the center outside the pressure regulating valve mounting window provided at the corner of the pillow-packed pillow packaging bag made of polypropylene film on the package body side (for example, the side opposite to the wrap-around). A valve is placed over the first ventilation hole in a valve tray having pores, and a lid having a second ventilation hole at one end from above and a valve retainer at the lower surface at the other end is fitted. The first vent hole of the valve mechanism is sealed from below with a support film piece as a sealing film piece, and a functional film piece having an electromagnetic wave absorbing layer over the entire surface of the support film piece is partially formed on the lower surface. The pressure regulating valve laminated (in a band shape) was sealed with the flange portion of the valve tray to obtain a packaging bag. As a content, "rice" was aseptically packaged in the packaging bag obtained here, and they were subjected to a microwave heating experiment (approximately 2 minutes and 30 seconds at an output of about 600 watts, and the temperature of the rice was adjusted to an appropriate temperature, ie, 93 to 98 ° C). However, in all the specimens, when microwave heating of the package was started, the electromagnetic wave absorbing layer of the functional film piece efficiently absorbed electromagnetic wave energy and converted it into heat energy. This causes this part to reach a very high temperature within a short time, and the functional film piece which has completely sealed the first vent is melted by this very high temperature, and the pressure inside the package increases and the pressure increases. It was destroyed at the same time, and one or an unspecified number of minute holes penetrating in the thickness direction were formed in this portion. As a result, the inside of the package was opened to the outside world, and no water vapor generated excessively in the package pushed up the valve along the route secured here and was discharged to the outside of the package and ruptured. Was.
This means that the first ventilation hole is sealed from above with the supporting film piece as a sealing film piece, and the functional film piece having the electromagnetic wave absorbing layer over the entire surface of the supporting film piece is partially (circularly) formed on the lower surface. The same result could be obtained in the case of the stacked pressure regulating valves.

<Example 3> A central portion and a lower portion of a pillow-packed pillow packaging bag made of a polypropylene film are provided outside a pressure-regulating valve mounting window provided at a corner on a package body side (for example, the opposite side of the wrapped palm). A valve is placed in a valve receiving tray formed in a thin shape with ribs, covering the thin portion with ribs on the lower surface, and a vent hole is provided at one end from above, and the other end is provided. Of a valve mechanism that is fitted with a lid having a valve retainer on the lower surface,
A pressure regulating valve, to which a functional film piece having an electromagnetic wave absorbing layer (a 200-300 mm thick aluminum vacuum deposited layer) is adhered from above to the thin portion, is adhered with the flange portion of the valve tray. A packaging bag with a pressure regulating valve was obtained. As a content, “rice” was aseptically packaged in the packaging bag obtained here, and they were subjected to a microwave heating experiment (approximately 6
For about 2 minutes and 30 seconds at 00 watt output, the temperature of the rice was heated to an appropriate temperature, that is, until the temperature reached 93 to 98 ° C.), but in all the specimens, when microwave heating of the package was started, The electromagnetic wave absorbing layer of the functional film piece efficiently absorbs the electromagnetic wave energy and converts it into heat energy, which causes this portion to reach a very high temperature in a short time, and the functional film piece as well as the And even the thin part adjacent to it was melted by this extremely high temperature, and both were thermally destroyed together with the rise in the pressure inside the package. Small holes were formed. As a result, the inside of the package was opened to the outside world, and none of the excess steam generated in the package pushed up the valve along the path secured here and was discharged to the outside of the package and burst. Was. The ribs reinforced the thin portions so that they did not bulge significantly and helped the thin portions to break sequentially and efficiently between the ribs. Further, as a result, the mesh constituted by the ribs prevented the part of the “rice” from jumping out due to boiling.

Example 4 A central portion was formed into a thin-walled shape at an arbitrary location on the outer side of the package body side of the pillow-packed pillow packaging bag made of polypropylene film (because the pressure regulating valve mounting window was not formed). In a valve tray, a valve is placed covering the thin portion, and a valve having a ventilation hole at one end from above and a lid having a valve retainer at the lower surface at the other end is fitted. An electromagnetic wave absorbing layer (a 200-300 mm thick vacuum-deposited layer of aluminum) from the lower side of the thin portion.
The pressure regulating valve to which the functional film piece having the above was adhered was adhered with the bottom of the valve tray to obtain a packaging bag with a pressure regulating valve. As a content, “rice” was aseptically packaged in the packaging bag obtained here, and they were subjected to a microwave heating experiment (approximately 6
For about 2 minutes and 30 seconds at 00 watt output, the temperature of the rice was heated to an appropriate temperature, that is, until the temperature reached 93 to 98 ° C.), but in all the specimens, when microwave heating of the package was started, The electromagnetic wave absorbing layer of the functional film piece efficiently absorbs the electromagnetic wave energy and converts it into heat energy, which causes this portion to reach a very high temperature in a short time, and the functional film piece as well as the The very thin part and even the plastic film forming the side of the package were melted by this extremely high temperature, and both were thermally destroyed together with the rise in the pressure inside the package. One or many small holes penetrating through were formed. As a result, the inside of the package was opened to the outside world, and any water vapor generated excessively in the package pushed up the rubber plate along the route secured here and was discharged out of the package, and none of them burst. there were.

[0038]

According to the pressure regulating valve of the present invention and the package to which the pressure regulating valve is attached, the electromagnetic wave absorbing layer of the functional film piece has an electromagnetic wave energy when the microwave heating of the package is started. And efficiently converts it into heat energy, which in this part reaches a very high temperature within a short time, and the electromagnetic wave absorbing layer part of the functional film piece or the supporting film piece. The functional film piece laminated portion, and the plastic film constituting the package body side adjacent thereto are melted by this extremely high temperature, and are thermally destroyed together with the increase in the pressure inside the package at this time,
In this portion, one or an unspecified number of minute holes are formed.

Alternatively, the functional film piece having the electromagnetic wave absorbing layer entirely or partially on the upper surface or the lower surface is not limited to itself (functional film piece) but also to the adjacent thin portion or the plastic film constituting the package body side. Are also melt-ruptured by this extremely high temperature,
In this portion, one to an unspecified number of small holes penetrating in the thickness direction are formed in combination with the increase in the pressure in the package. In the pressure-regulating valve and the package with the pressure-regulating valve of the present invention, the thin portion in the central portion of the valve tray has ribs in a lattice shape or the like, and from the side opposite to the ribs, on the upper surface or the lower surface, In the case where a pressure regulating valve to which a functional film piece having an electromagnetic wave absorbing layer is adhered in whole or in part is attached, the thin-walled portion does not swell greatly due to microwave heating, and the thin-film portion sequentially and efficiently between ribs. Destruction will proceed. In addition, the mesh formed by the ribs can be prevented from being broken, and as a result, a part of the packaged object can be prevented from jumping out due to boiling.

When microwave heating of the package is started, water vapor and the like generated from the article to be packaged are discharged out of the package through one or an unspecified number of minute holes formed therein. As a result, the pressure inside the package almost reaches equilibrium with the atmospheric pressure, and the explosion of the package is avoided. That is, in the present invention, suitable for microwave oven heating, in the package with a pressure regulating valve fitted with a pressure regulating valve, at the time of microwave oven, slightly open the corner of the tray in advance, or the top cover film. Since it is not necessary to take measures such as providing several openings with a sharp-pointed object, safety is secured even if an unfamiliar elderly person or the like directly heat-treats.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a pressure adjusting valve portion of a package with a pressure adjusting valve according to a first invention of the present invention.

FIG. 2 is a schematic cross-sectional view of a portion along a line AA of the pressure regulating valve unit in FIG. (A) shows the case of a pressure regulating valve in which the first ventilation hole is entirely sealed from the lower side with a functional film piece having an electromagnetic wave absorbing layer on the whole, except for the pressure regulating valve mounting window (pressure regulating valve). (Because the valve mounting window is not formed). (B) shows the case of a pressure control valve in which the first vent hole is also sealed from the lower side, and the functional film piece having the electromagnetic wave absorbing layer over the entire surface is entirely sealed from the lower surface with a partially laminated support film piece. , Which is glued to the pressure regulating valve mounting window.

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

FIG. 4 is a schematic cross-sectional view of a portion along a line AA of the pressure regulating valve unit in FIG. 3; (A) shows a case in which a pressure regulating valve using a valve tray formed of a thin film portion into a thin film shape with a rib attached to the lower surface is bonded to the outside of the pressure regulating valve mounting window with the flange portion of the valve tray. It is. In (b), the functional film is adhered to the lower surface of the thin film portion. In this case, the functional film is adhered to the package at the bottom of the valve tray adjacent to the package.

FIG. 5 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 control valve 2 ... Valve tray 21 ... First ventilation hole 22 ... Flange part 3 ... Valve 4 ... Lid 41 ... Second ventilation hole 42 ... Valve holder 5 ... Sealing film piece 51 ... Functional film piece 52 ... Support Film piece 53 ... Thin portion 54 ... Rib 6 ... Packing body 61 ... Packing body side 62 ... Pressure adjustment valve mounting window

Claims (5)

[Claims] 1. A valve is placed in a valve tray having a first vent hole in a central portion so as to cover the first vent hole, and has a second vent hole at one end from above and a lower surface at the other end. A valve mechanism having a valve body fitted with a valve retainer, the first vent hole being sealed from above or below from above or below as a sealed film piece on the upper or lower surface, with a functional film piece having an electromagnetic wave absorbing layer entirely sealed. Pressure regulating valve characterized by the following. 2. A valve is mounted in a valve tray having a first ventilation hole in a central portion so as to cover the first ventilation hole, and a second ventilation hole is provided at one end from above and a lower surface at the other end. The first vent hole of the valve mechanism formed by fitting a lid body having a valve retainer from above or below is entirely sealed with a support film piece as a sealing film piece, and on the upper or lower surface of the support film piece. ,
The pressure regulating valve according to claim 1, wherein a functional film piece having an electromagnetic wave absorbing layer is laminated. 3. A valve is placed in a valve tray having a thin portion which is opened at a central portion to become a first air hole, covering the thin portion, and a second air hole is formed at one end from above. A pressure mechanism, wherein a functional film having an electromagnetic wave absorbing layer is attached to an upper surface or a lower surface of the thin portion of the valve mechanism in which a lid body having a valve retainer is fitted on the lower surface of the other end. tuning valve. 4. A package with a pressure regulating valve, wherein the pressure regulating valve according to claim 1 is attached to a pressure regulating valve mounting window provided in the package. 5. A valve is placed in a central portion of a valve tray having a first ventilation hole or a thin-walled portion that becomes the first ventilation hole by opening the valve so as to cover the first ventilation hole. A portion of the valve mechanism having a second ventilation hole in the portion and a lid having a valve retainer on the lower surface of the other end portion, and a functional film piece having an electromagnetic wave absorbing layer on the lower surface of the first ventilation hole was attached. A package with a pressure regulating valve, wherein the pressure regulating valve is attached to the outer surface of the package.