JPH11278556A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize generated air and vapor to allow uniform thawing and heating by forming protruding hot-bonded parts respectively at corner end rim hot-bonded parts to divide a packaging bag into two portions including a small corner section and a remaining large space while they are communicated with each other and by preventing air from directly flowing from the large space to an air inlet. SOLUTION: Protruding hot-bonded parts 5, 6 protruding from end rim hot- bonded parts 2, 3 at corners of the packaging bag 1a are formed to divide the bag into two portions including a small space 4 and a remaining large space 8 wherein a gap serves as a communication port 1. An air inlet forming cut 9 and a V-shaped notch 10 are provided across the small space 4, and an anti-tearing wall 40 is provided at an end of the cut 9. A V-shaped unsealing port forming notch 20 and an unsealing port forming cut 19 are formed on a peripheral side of a hot-bonded part 11. The communication port 7 and the small space 4 are of such a size that a sphere of a diameter of at least 5 mm can move through, so that internal pressure can be smoothly discharged from the communication port 7 to the air inlet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag for a microwave oven, and more particularly, to a proper air permeability when the contents such as food are thawed and heated by a microwave oven in a state where the contents are kept in the packaging bag. And relates to a packaging bag for a microwave oven that does not break.

[0002]

2. Description of the Related Art Conventionally, as a package generally provided as a microwave oven package, for example, when packaging solids such as cooked rice and red rice, for example, a polyethylene film is applied to a film of nylon or polyester. Or a laminated film made by laminating polypropylene or polypropylene film, the inner surface of which is laminated with a polyethylene film or polypropylene film, and the required peripheral portion is thermally bonded. When thawing or heating an object in a microwave oven, it is necessary to provide a vent to release the air that expands due to thawing or heating and prevent the bag from breaking. Or tear the package completely from the opening and transfer the contents to dishes, etc. Has been Nari heating Nari be thawed in a microwave oven after by wrapping the tableware and the like in the absence of such.

[0003] Further, in the case where the contents are liquid contents or liquid contents, and the contents are thawed or heated together with the package, the contents may be thawed or heated in a microwave oven. A package having a shape-retaining property so that the liquid substance of the content does not spill, for example, a standing pouch, a blister pack, or a tray-pack package is used, and expands by thawing or heating as described above. Since it is necessary to provide an air vent for releasing air and preventing the bag from being broken, the package is used by tearing a part of the package from an opening part and opening the package. In the same manner as described above, the package is completely torn from the opening portion, the contents are transferred to tableware or the like, the tableware or the like is wrapped with a film or the like, and then thawed in a microwave oven or heated.

However, when the contents are transferred to tableware or the like and then thawed and heated in a microwave oven, it takes time and effort to package the tableware and the like, so the meaning of the package for a microwave oven is meaningful. Although it can not be understood, on the other hand, by wrapping the tableware etc. with the contents with a film etc., the heat is spread evenly to the contents,
It provides uniform thawing and heating.

[0005] This is common to the case where the contents are thawed and heated together with the package. However, in the case where a vent is provided by tearing a part of the package from the opening and opening the package as in the conventional case. However, it is extremely difficult to provide an air vent of an appropriate size for thawing or heating the contents.

Therefore, for example, a groove-shaped unbonded portion of an appropriate size serving as a vent is provided in advance in the heat bonded portion of the package,
A method has been devised in which the groove-shaped unbonded portion is configured to be torn so as to provide a vent that does not cause individual differences. However, this method is effective for packages such as blister packs and tray packs, but is not suitable for standing pouches, three-way seals,
In the one-side sealed packaging bag, the portion formed with the ventilation opening is bent by the expansion of the packaging bag by thawing or heating, and the ventilation opening is closed, so that the intended effect cannot be obtained.

In a conventional microwave oven package, a vent is provided by tearing a part of the opening from the opening to open the package, and after thawing or heating the contents, the package has an opening provided with the vent. It is configured to tear off all remaining portions and transfer them to tableware or the like. However, the part provided with the vent is thawed or heated, for example, the oil contained in the contents or water droplets mixed with the contents is attached, and when the package is opened and transferred to tableware, etc. There are problems such as that the fingers become dirty, slimy with oil or the like, that the remaining portion cannot be torn, and that water vapor comes out of the vent, and that it cannot be held immediately because it is hot. .

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method for thawing or heating the contents of a food or the like stored in a packaging bag using a microwave oven together with the packaging bag. Vents can be easily formed to discharge the air to the outside, and the air and water vapor generated by thawing and heating can be effectively used to spread the heat evenly to the contents. In addition to being able to perform thawing and heating without thawing, even if the packaging bag expands due to thawing or heating, it is possible to reliably secure a vent, and furthermore, it is generated from the contents attached to the packaging bag after thawing or heating. An object of the present invention is to provide a packaging bag that can be easily opened and its contents taken out without contamination of fingers with oil or the like and without contact with hot air or water vapor discharged to the outside from a vent.

[0009]

The present inventors have conducted various studies to solve the above problems, and as a result, the packaging bag according to the first aspect of the present invention has two corners forming a corner. In a packaging bag formed by thermal bonding having an intersecting edge thermal bonding portion, the packaging bag is formed into two space portions including a small space portion formed on the corner portion side and another large space portion. 2
A projecting thermal bonding portion projecting from each of the edge thermal bonding portions is formed so as to be divided and the two space portions have a communication port, and a packaging bag is provided on a corner side of the small space portion. It is characterized in that, when a vent for removing air from inside is provided, the air in the large space does not flow linearly into the vent. With this configuration, it is possible to provide a small space formed on the side of the corner portion serving as a ventilation port at the time of thawing or heating as a packaging bag by thermal bonding. In addition, the shape of the small space portion formed on the corner portion side can be appropriately selected depending on the content accommodated in the packaging bag, so that the heat is evenly distributed to the content, and there is no unevenness. Thawing and heating can be enabled.

According to a second aspect of the present invention, in the packaging bag of the first aspect, the small space portion and the communication port are configured so that a sphere having a diameter of 5 mm is at least movable. It is. With this configuration, the internal space passes through the small space portion without being bent by the internal pressure that is increased during thawing or heating, because the small space portion formed on the corner portion side that becomes a ventilation port during thawing or heating does not bend due to the internal pressure that increases during thawing or heating. And can escape smoothly to the outside.

[0011] The invention according to claim 3 is based on claim 1,
2. The packaging bag according to any one of 2, wherein the small space portion is provided with a vent forming notch serving as a tearing start end for forming a ventilation opening for releasing air in the packaging bag by communicating with the outside of the packaging bag. The packaging bag is provided on the peripheral edge of the edge thermal bonding portion. With this configuration, the tearing start end for providing the ventilation port becomes clear and a trigger for tearing can be given.

[0012] The invention described in claim 4 is the first invention.
3. The packaging bag according to any one of 3, wherein the packaging bag is composed of at least a two-layer laminate of an outer layer and an inner layer, and when the packaging bag is formed into a synthetic resin film constituting the outer layer of the laminate. The cutout for vent opening is formed on the corner side of the small space portion so that the small space portion communicates with the outside of the packaging bag to form a ventilation hole for removing air in the packaging bag. It is characterized by being carved so as to cross. With this configuration, the packaging bag can be smoothly torn without resistance when the packaging bag is torn in order to provide the ventilation hole.

According to a fifth aspect of the present invention, in the packaging bag according to the fourth aspect, the notch for forming the vent is formed so as to be connected to the notch for forming the vent. It is. With such a configuration, the tearing start end for providing the ventilation port becomes clear, a trigger for tearing can be given, and the packaging bag can be smoothly torn without resistance when tearing.

[0014] The invention according to claim 6 is the first invention.
5. The packaging bag according to any one of 5, wherein a tear opening start end for forming a tear opening for taking out the contents contained in the large space portion at a predetermined position on a peripheral edge of the thermal bonding portion of the packaging bag. A notch for forming is formed. With such a configuration, the tearing start end for providing the opening can be clearly defined and a trigger for tearing can be given. Also, by separating the opening opening notch from the position where the vent is provided,
After thawing and heating the packaging bag, your fingers will not get dirty,
It is possible to easily open the bag without blowing hot water by blowing steam or the like to provide an opening, and take out the contents.

[0015] Further, the invention according to claim 7 is based on claims 1 to
6. In the packaging bag according to any one of 6, the plastic resin film constituting the outer layer of the laminate is provided with an opening for taking out the contents contained in the large space when the packaging bag is formed. As described above, the cutout for forming the opening is formed at a predetermined position. With this configuration, the packaging bag can be smoothly torn without resistance when tearing the packaging bag to provide the opening.

The invention according to claim 8 is characterized in that, in the packaging bag according to claim 7, the notch for forming the opening is connected to the notch for forming the opening. It is. With this configuration, the tearing start end for providing the opening can be clearly defined, a trigger for tearing can be given, and the packaging bag can be smoothly torn without resistance when tearing.

The invention according to claim 9 is the invention according to claim 4,
The packaging bag according to any one of 5, 7, and 8, wherein the cut for forming the vent or the opening is formed as at least one continuous or discontinuous cut line by a pulsed laser. Things. With this configuration, by selecting the wavelength of the pulsed laser, it is possible to form a cut for forming a vent or an opening in only the film constituting the outer layer.

According to a tenth aspect of the present invention, in the packaging bag according to the first aspect, one of the protruding thermal bonding portions projecting from each of the edge thermal bonding portions is formed so as to cover the other. When a vent is provided at the corner of the small space portion to release air from the packaging bag, the vent is formed by the one protruding thermal bonding portion and the other protruding thermal bonding portion. It is characterized in that the air in the large space portion does not flow linearly from the mouth.

The invention according to claim 11 is the packaging bag according to claim 1, wherein the island having a longer length than the communication port at a position facing the communication port in the small space portion or the large space portion. A buffered heat-bonded portion is formed, and a gap between the buffered heat-bonded portion and the protruding heat-bonded portion is configured such that a sphere having a diameter of 5 mm is at least movable, and is packaged on the corner side of the small space portion. When a vent is provided to release air from the bag,
It is characterized in that the air in the large space does not flow linearly into the vent.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. First, the material constituting the packaging bag of the present invention may be a resin having a thermal adhesive property as the inner layer, as long as it can be melted and fused together by heat, for example, low-density polyethylene, Medium-density polyethylene, high-density polyethylene, linear (linear) low-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene- Methacrylic acid copolymer, ethylene-polypropylene copolymer, etc., can be used as a resin or a resin made of one or more of these resins, or a sheet made of these resins, and the thickness is suitably 20 to 200 μm. .

Further, since the outer layer is a basic material constituting the packaging bag of the present invention, a synthetic resin having excellent properties in mechanical, physical, chemical and the like can be used. Resins such as resin, polyamide, polypropylene, polycarbonate, and polyacetal can be used. In addition, as a film using these resins, any one of an unstretched film, a uniaxially stretched film, a biaxially stretched film and the like can be used. It is only necessary to have a thickness that can be kept to the minimum necessary.If it is too thick, laser processing failure etc. will occur and the tearability will decrease, and there is also a disadvantage that the cost will increase. , Rigidity and the like are undesirably reduced. In the present invention, about 12 to 25 μm is appropriate for the above reasons. Also,
The film made of the synthetic resin may be a film coated with polyvinylidene chloride as necessary, or a film formed with a deposited layer of silicon oxide. Further, the synthetic resin film used as the outer layer,
In general, printing is often performed on the inner layer side of the synthetic resin film, and therefore, the synthetic resin film used as the outer layer is required to have printability, and a uniaxially stretched or biaxially stretched film is used. It is suitable.

Further, in the present invention, an intermediate layer may be provided between the inner layer and the outer layer, and the intermediate layer usually cannot sufficiently function as a packaging bag with only the inner layer and the outer layer. It is provided in cases and the like. The functions include gas barrier properties, mechanical toughness, bending resistance, puncture resistance, impact resistance, abrasion resistance, cold resistance, heat resistance, chemical resistance, etc., and are required for packaging bags. These final functions are achieved by providing an intermediate layer. As the base material used as the intermediate layer, for example, polyethylene terephthalate, polyamide, polyethylene,
Polyolefins such as polypropylene, polyvinyl chloride,
Films of polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, saponified ethylene-vinyl acetate copolymer, etc., or films coated with polyvinylidene chloride, or films coated with silicon oxide, or films of polyvinylidene chloride, etc. Can be used. If necessary, one or more of these base materials can be used in combination. Note that the thickness of the base material is not particularly limited as long as the function required for the package is satisfied, and can be appropriately selected as needed.

Next, in the present invention, as a method of engraving a cut for forming a vent or an opening when forming a packaging bag in the synthetic resin film used as the outer layer, for example, a heated needle is used. Needle punching method, embossing roll method, hot-melt perforation method for melting and perforating a film using a polishing roll, a whetstone, polishing tape, etc., physical perforation method using a knife, cutter, etc., laser beam processing, corona discharge , Plasma discharge or the like. Thus, in the present invention, in forming a cut for forming a vent or an opening in a synthetic resin film used as an outer layer, the synthetic resin film is used alone or as an outer layer as an inner layer. Heat-sealing resin or a sheet obtained by laminating the resin into a film 2
State of a laminated body composed of layers, or a state of a laminated body composed of at least three layers provided with the above-mentioned intermediate layer between the outer layer and the inner layer. It may be engraved in any state such as a state, whereby a cut for forming a vent or an opening can be provided in a synthetic resin film used as an outer layer.

In the present invention, the shape of the cut for forming the vent or the opening may be any shape such as a straight line, a curved line, a perforated line, or a broken line.
It may be one or more, and even if it is continuous,
Any of discontinuous shapes and the like may be used. Further, the structure of the cut for forming the vent or the opening for opening may be any state of a through hole, a half cut state, or a state in which they are mixed. In the present invention, the cut part is weakened and the ventilation of the packaging bag is weakened. What is necessary is just to function as a cut for opening or opening.

In the present invention, as a method of forming a cut for forming a vent or an opening in a synthetic resin film used as an outer layer, a method for forming a perforated vent using a pulse oscillation type laser is used. Alternatively, a method of engraving a notch for forming an opening is the most suitable method.
The type of laser used for this can be, for example, a carbon dioxide laser, a YAG laser, a semiconductor laser, an argon ion laser, or the like, and is not particularly limited. However, when a cut for forming a vent or opening is formed in a synthetic resin film used as an outer layer, it is necessary that the resin film used absorbs a laser oscillation wavelength. For example, when using a carbon dioxide laser, the wavelength of 10.6 microns of the carbon dioxide laser light is converted to a polyamide film (nylon-6 film).
The film mainly containing linear low-density polyethylene or ethylene-vinyl acetate copolymer allows most of the light to pass through. Therefore, a film mainly composed of linear low-density polyethylene or ethylene-vinyl acetate copolymer is used as the heat-sealing film of the inner layer, and a biaxially stretched polyamide film (nylon-6 film) is used as the outer layer of the synthetic resin film. ) Is used, and a two-layer laminate obtained by laminating the two in combination is used, and the laminate is irradiated with a carbon dioxide gas laser and subjected to laser processing, whereby the biaxially stretched polyamide film (nylon-6 film) is obtained. Only the cut for forming the vent or the opening can be selectively formed only on the cut, and the cut for forming the vent or the opening is mainly made of linear low-density polyethylene or ethylene-vinyl acetate copolymer. The film to be melted does not close the cut for forming the vent or opening It can be provided with a vent or opening port tore very good package. Further, the same result as described above can be obtained even when laser processing is performed by irradiating a carbon dioxide gas laser in the state of a packaging bag using the laminate. As described above, by selecting the wavelength by laser processing, a cut for forming a vent or an opening can be selectively formed only in a synthetic resin film used as an outer layer.

The form of the packaging bag of the present invention can be arbitrarily selected from a three-sided seal type, a four-sided seal type, a standing pouch, a gusset type, an envelope-attached seal type, a pillow type and the like. However, it is suitable for standing pouches, three-sided sealing type, and four-sided sealing type packaging bags.In particular, the standing pouch itself is a self-supporting packaging bag, and can be used to stand when thawing or heating in a microwave oven. Thawing and heating can be performed in a defrosted state, and even if the content is a liquid substance, or even if it contains a liquid substance, there is no fear that the liquid substance leaks after thawing or heating, and the packaging bag of the present invention Is the most suitable.

Next, in the packaging bag of the present invention, as a method of forming the protruding thermal bonding portion or the buffering thermal bonding portion, for example, the protruding thermal bonding portion or the buffering thermal bonding portion is formed by a hot plate seal. In this case, by using a hot plate having a convex portion of a desired shape formed on the hot plate of the hot plate seal by heat bonding, a protruding heat bonding portion having various shapes can be easily formed. Or a buffered heat bonding portion.

In the packaging bag of the present invention, a method for forming a notch for forming a vent or an opening can be, for example, performed by using a known die having a male die and a female die. , Can be easily formed. Also, as the shape of the notch for ventilation or opening,
It is sufficient that the portion of the notch for ventilation or opening which is connected to the cut for forming the ventilation opening or opening is formed at an acute angle. Generally, a notch such as a triangular (V-shaped) or pentagonal shape is used.

[0029]

Next, an embodiment will be described in detail with reference to the drawings. FIG. 1 is a plan view of a first embodiment of a packaging bag according to the present invention, and FIG.
FIG. 3 is a plan view of a second embodiment of the packaging bag according to the present invention, FIG. 3 is an enlarged view of a main part of the third embodiment of the packaging bag according to the present invention, and FIG. FIG. 5 is an enlarged view of a main part of a fifth embodiment of the packaging bag according to the present invention, and FIG. 6 is an enlarged view of a main part of a sixth embodiment of the packaging bag according to the present invention. FIG. 7 is a sectional view showing the layer structure of the packaging bag of FIGS. 1 to 6, wherein 1A, 1B, 1C, 1D, 1E, 1F in the figure.
Is a packaging bag, 2 and 3 are edge thermal bonding portions, 4 is a small space portion, 4 'is a grooved space portion, 5, 6, 15, and 16 are protruding thermal bonding portions, 7, 17 are communication ports, and 8 is a communication port. Large space portion, 9 is a notch for forming a vent, 10 is a notch for forming a vent, 11 is a thermal bonding portion, 12 and 13 are thermal bonding portions for buffer, 19 is a notch for forming an opening, and 20 is a notch for forming an opening. , 30
Denotes an embossed portion, 40 denotes a tear prevention wall, 50 denotes an outer layer, 60 denotes an inner layer, and 70 denotes a laminate.

FIG. 1 is a plan view of a first embodiment of a packaging bag according to the present invention, wherein a packaging bag 1A is a standing pouch having a peripheral edge thermally bonded, and a corner portion of the packaging bag 1A. (The upper left corner in the figure) intersecting edge thermal bonding portions 2, 3 projecting from the edge thermal bonding portion 2 are protruding thermal bonding portions 5 between the edge thermal bonding portions 3. A protruding thermal bonding portion 6 is provided so as to form a space, and extends from the edge thermal bonding portion 3 so as to cover the space and form a gap with the tip of the protruding thermal bonding portion 5. A small space portion 4 is formed which is surrounded by the edge thermal bonding portions 2 and 3, the projecting thermal bonding portion 5 and the projecting thermal bonding portion 6. With this configuration, the packaging bag 1A is divided into the small space portion 4 and the other large space portion 8 by the protruding thermal bonding portions 5 and 6, and the gap is formed between the small space portion 4 and the large space portion. It becomes the communication port 7 connecting the unit 8. Further, when the communication port 7 is provided with a vent for removing air in the packaging bag 1A at the corner of the small space 4, the air in the large space 8 is provided from the communication port 7 to the vent. Do not flow linearly, and even if the contents are bumped when the packaging bag 1A in which the contents are stored in the large space portion 8 is thawed or cooked by a microwave oven, So that it does not blow out directly from the vent.

Further, a notch 9 for forming a vent is formed from the peripheral edge of the edge thermal bonding portion 3 so as to cross the small space portion 4 and one end of the notch 9 for forming the vent. A V-shaped notch 10 for forming a ventilation hole is provided at the intersection of the edge thermal bonding portion 3 and the peripheral edge. Further, the other end of the cut 9 for forming the ventilation hole reaches an elongated hole-shaped tear prevention wall 40 provided in the protruding thermal bonding portion 5.
The tear prevention wall 40 can be formed by, for example, embossing a known standing pouch bag making machine that manufactures the packaging bag 1A with a hot plate having the shape of the tear prevention wall 40. It can also be formed by making the portion to be the tear prevention wall 40 of the hot plate forming the thermal bonding portion 5 into a concave shape to be an unbonded portion,
It can also be formed by providing an I-shaped cutting edge or a slotted notch. By the way, the shape of the tear prevention wall 40 may be any shape such as a circular shape, an elliptical shape, and a polygonal shape without being limited to the elongated hole shape. From the notch for forming 10 to the cut 9 for forming the vent, the packaging bag
When 1A is torn, the tear prevention wall 40 serves as a weir, and the tear prevention wall 40 is difficult to tear before the tear prevention wall 40.

On the other hand, a heat bonding portion 11 having a large width is formed at a position facing a side of the edge heat bonding portion 3 provided with the cutout 10 for forming the air vent, and a side facing the side. A V-shaped opening opening notch 20 is formed in a peripheral edge of the heat bonding portion 11, and the V-shaped opening opening notch 20 is formed.
An opening opening notch 19 is formed from the V-shaped vent opening forming notch 10 to the edge thermal bonding portion 3. Further, embossed portions 30 are formed in the thermal bonding portion 11 provided with the V-shaped opening opening notch 20 so as to sandwich the V-shaped opening opening notch 20.

The reason why the heat bonding portion 11 is made wide is to prevent the packaging bag 1A from becoming hot and difficult to hold with fingers when the packaging bag 1A is cooked by thawing or heating in a microwave oven. For this reason, this configuration may be provided as needed. Further, the embossed portions 30, 30 were provided so as to sandwich the V-shaped opening opening notch 20 in the thermal bonding portion 11, because the packaging bag 1A was opened after cooking such as thawing or heating in a microwave oven. This is because when the contents are taken out, it is difficult to slip and open easily. In the case where the embossed portions 30 and 30 are formed only with the opening opening forming cut 19 in the packaging bag 1A and are not provided with the V-shaped opening opening forming notch 20, Although it also functions as an indication of the unsealing position, this configuration may be provided as needed as described above.

Further, the V-shaped notch 10 for forming an air vent is provided.
In the case where the cutout 9 for forming the ventilation hole is provided, the cutout 9 may not be provided. Further, embossed portions similar to the embossed portions 30, 30 provided so as to sandwich the cutout 20 for forming the opening in the heat-bonded portion 11 are provided on the edge heat-bonded portion 3 so as to sandwich the cut 9 for forming the vent. It does not matter.

The embossed portion can be easily formed. For example, the embossed portion can be formed by hot-point bonding with hot plates of various shapes. By forming the surface into various irregularities, embossed portions having various irregularities can be formed.

Next, the case where the packaging bag 1A is used will be described. First, a vent is formed by tearing from the vent forming notch 10 along the vent forming notch 9, and thereafter the vent is provided. The packaging bag 1A is put into a microwave oven and cooked such as thawing and heating.After the thawing and heating are completed, the bag is torn along the opening forming notch 19 from the opening forming notch 20 to provide an opening. Then, take out the contents from the opening to tableware. Since the opening opening notch 20 for providing the opening is formed at a position opposite to the side provided with the ventilation hole, the fingers are not stained, and without feeling hot by blowing out steam or the like, The contents can be taken out.
In the case of FIG. 1A, the opening forming notch 20 and the embossed portions 30, 30 are provided at positions opposite to the vent forming notch 10, but although the usability is somewhat inferior to that of FIG. It may be provided on the same side as the notch 10.

When the packaging bag 1A is placed in a microwave oven and cooked such as thawing or heating, the internal pressure is increased due to thermal expansion, and the bag is put on a bread pan. At this time, the small space portion 4 forming the ventilation opening is bent at the communication opening 7 so that the internal pressure cannot be released. The bending is caused by the size of the communication port and the size of the small space portion 4 forming the ventilation port. In order to prevent the bending, the communication port 7 and the small space portion are required. The size of 4 needs to be configured such that at least a sphere having a diameter of 5 mm can move. With such a configuration, even when the internal pressure in the bag increases, the small space portion 4 does not bend at the communication port 7, and passes the internal pressure from the communication port 7 through the small space portion 4. Can escape smoothly to the vent. The communication port 7
And when one of the small space portions 4 is not configured to the above size, the packaging bag 1A
Is bent at the communication port 7, and the internal pressure cannot be released smoothly.

FIG. 2 is a plan view of a packaging bag according to a second embodiment of the present invention. The packaging bag 1B is the same as the packaging bag 1A of the first embodiment shown in FIG. Except that the protruding thermal bonding portions 5 and 6 provided at the respective positions are provided in reverse positions, and the positions at which the vent forming notch 10, the vent forming cut 9 and the tear prevention wall 40 are provided are changed accordingly. This is the same as the first embodiment, and the description is omitted.

FIG. 3 is an enlarged view of a main part of a third embodiment of the packaging bag according to the present invention. The packaging bag 1C is formed by the protruding heat bonding portions 5 and 6 shown in the first embodiment of FIG. The communication port 7 formed is formed as a communication port 17 formed in a groove shape by forming the protruding heat bonding sections 15 and 16 in which the shapes of the protruding heat bonding sections 5 and 6 are changed. Is the same as the configuration shown in the first embodiment, and the description is omitted. With such a configuration, the communication port 17 is connected to the projecting heat bonding portion 15.
And the protruding thermal bonding portion 16 and the protruding thermal bonding portion 16
Is formed in an S-shape by the tip of the protrusion and the protruding heat bonding portion 15, and the steaming effect can be enhanced as compared with the first embodiment. As a matter of course, the communication port 17 and the small space portion 4 are configured such that a sphere having a diameter of at least 5 mm is movable.

FIG. 4 is an enlarged view of a main part of a fourth embodiment of the packaging bag according to the present invention, wherein the packaging bag 1D is formed from each of the edge heat bonding portions 2 and 3 which intersect each other forming a corner portion. The packaging bag 1D is divided into two spaces, each of which is composed of a small space portion 4 formed on the corner portion side and another large space portion 8, and the two space portions define the communication port 7. The thermal bonding portions 5 and 6 are formed so as to protrude, and the buffer thermal bonding portion 12 having a length longer than the island-shaped communication port 7 is provided at a position of the small space portion 4 facing the communication port 7. Is formed,
When a vent is provided on the corner side of the small space portion 4 to release the air in the packaging bag, the air in the large space portion 8 does not flow straight through the vent hole. With this configuration, when the packaging bag 1D containing the contents is thawed or cooked in a microwave oven or the like, even if the contents bump, even if the contents are bumped, the bumped material is directly discharged from the vent. It does not blow out to the inside and does not pollute the inside of the microwave oven.

Further, the packaging bag 1D is provided with a cut 9 for forming a vent so as to cross the corner of the small space portion 4, and the cut 9 for forming the vent and the edge heat bonding portion. A V-shaped vent opening notch 10 is provided at the intersection with the peripheral edge of No. 3. Of course, at least the diameter of the communication port 7 and the distance between the protruding thermal bonding portions 5 and 6 and the buffer thermal bonding portion 12 are at least 5 mm.
The sphere of mm is configured to be movable. FIG. 4 shows an embodiment in which the notch 10 for forming the vent is provided at the intersection of the notch 9 for forming the vent and the peripheral edge of the edge thermal bonding portion 3. May be provided at the intersection of the vent hole forming cut 9 and the peripheral edge of the edge thermal bonding portion 2, or may be provided at both. In the case where the cut 9 for forming the vent is provided, the notch 10 for forming the vent may not be provided. Further, the embossed portion described in the first embodiment may be provided.

FIG. 5 is an enlarged view of a main part of a fifth embodiment of the packaging bag according to the present invention. The packaging bag 1E is a small space portion 4 of the packaging bag 1D shown in the fourth embodiment of FIG. A groove-shaped space portion 4 'is formed on the corner portion side as a ventilation hole with the outside, and a ventilation hole forming cut 9 is provided so as to cross the groove-shaped space portion 4'. A V-shaped vent opening notch at the intersection of one end of the notch 9 and the peripheral edge of the protruding thermal bonding portion 3
10, and a slot-shaped tear prevention wall 40 is provided at the other end of the vent hole forming cut 9, and the slot-shaped tear prevention wall 40 is It is provided near the groove-shaped space portion 4 '. Other than this, the fourth embodiment is the same as the fourth embodiment in FIG. 4 and the description is omitted.

FIG. 6 is an enlarged view of a main part of a sixth embodiment of the packaging bag according to the present invention. The packaging bag 1F is a small space portion 4 of the packaging bag 1E shown in the fifth embodiment of FIG. An island-shaped buffered heat bonding portion 13 having a longer length than the communication port 7 is formed at a position facing the communication port 7 in the large space portion 8 at a position facing the communication port 7 of the large space portion 8. Then, when a vent for removing air from the packaging bag is provided in the groove-shaped space 4 ′ formed on the corner portion side of the small space 4, the air in the large space 8 is supplied to the vent. FIG. 5 except that it is configured not to flow linearly.
The fifth embodiment is the same as the fifth embodiment, and the description is omitted. Also in this case, the communication port 7 and the size between the communication port 7 and the buffered heat bonding portion 13 are configured such that a sphere having a diameter of at least 5 mm is movable.

FIG. 7 is a sectional view showing the layer structure of the packaging bag shown in FIGS. 1 to 6. The packaging bags 1A to 1F each have an outer layer made of a 15 μm biaxially stretched polyamide film (nylon-6 film).
It comprises a two-layer laminate 70 of 50 and 60 μm inner layer 60 made of polypropylene. The laminate 70 of FIG.
Although the inner layer 60 and the inner layer 60 are manufactured by a well-known dry lamination method, they may be manufactured by a well-known T-die extrusion lamination method. In this case, an anchor coating agent can be used as necessary. In order to make the laminate 70 into the packaging bags 1A to 1F, the surfaces of the inner layers 60 of the laminate 70 are opposed to each other by a well-known standing pouch bag making machine to form a body portion, and the bottom portion (FIGS. 1 and 2). (A lower part of the figure), the inner layer 60 of the bottom material made of the laminated body 70 is folded in a V-shape so as to face the inner layer 60 of the laminated body 70 forming the body, thereby forming the body 70. It can be manufactured by inserting between the inner layers 60 and thermally bonding the peripheral portion thereof with a hot plate having a predetermined shape.

The first to sixth embodiments shown in FIGS. 1 to 6 show typical examples of the packaging bag of the present invention, and the present invention is not limited to this. Needless to say, all the packaging bags according to the above configuration are included in the packaging bag of the present invention.

[0046]

According to the present invention, when the contents such as foods contained in a packaging bag are thawed or heated together with a microwave oven, air or water vapor generated by the thawing or heating is removed. Ventilation holes for discharge to the outside can be easily formed, and air and water vapor generated by thawing and heating are effectively used to spread heat evenly to the contents, so that thawing without unevenness Or heating can be performed. Furthermore, even if the packaging bag expands due to thawing or heating, the ventilation holes can be reliably secured, and the hands are not stained with oil or the like generated from the contents attached to the packaging bag after thawing or heating. This has the effect that the contents can be easily opened and the contents taken out without touching the hot air or water vapor discharged to the outside from the vent.

[Brief description of the drawings]

FIG. 1 is a plan view of Embodiment 1A of a packaging bag according to the present invention.

FIG. 2 is a plan view of a second embodiment of the packaging bag according to the present invention.

FIG. 3 is an enlarged view of a main part of a third embodiment of the packaging bag according to the present invention.

FIG. 4 is an enlarged view of a main part of a fourth embodiment of the packaging bag according to the present invention.

FIG. 5 is an enlarged view of a main part of a fifth embodiment of the packaging bag according to the present invention.

FIG. 6 is an enlarged view of a main part of a sixth embodiment of the packaging bag according to the present invention.

FIG. 7 is a sectional view showing a layer configuration of the packaging bag of FIGS.

[Explanation of symbols]

1A, 1B, 1C, 1D, 1E, 1F Packaging bag 2, 3 Edge thermal bonding part 4 Small space part 4 'Groove space part 5, 6, 15, 16 Projecting thermal bonding part 7, 17 Communication port 8 Large space Part 9 Notch for forming vent 10 Notch for forming vent 11 Heat bonding part 12, 13 Buffering heat bonding part 19 Cut notch for forming opening 20 Notch for forming opening 30 Embossed part 40 Tear prevention wall 50 Outer layer 60 Inner layer 70 Laminate

Claims (11)

[Claims] 1. A packaging bag formed in a bag shape by thermal bonding having edge heat bonding portions that intersect each other forming a corner portion, wherein the packaging bag is formed with a small space portion formed on the corner side and other parts. A projecting thermal bonding portion projecting from each of the edge thermal bonding portions is formed so as to be divided into two into two spaces each including a large space portion, and the two spaces have a communication port. When a vent is provided on the corner side of the small space to release air in the packaging bag, the air in the large space does not flow straight through the vent. And packaging bag. 2. The small space portion and the communication port have a diameter of 5 mm.
The packaging bag according to claim 1, wherein the spherical body of mm is configured to be movable at least. 3. A notch for forming a vent, which serves as a tearing start end for forming a vent through which the small space portion communicates with the outside of the packaging bag to release air in the packaging bag, is provided at the end of the packaging bag. The packaging bag according to claim 1, wherein the packaging bag is provided on a peripheral edge of the edge heat bonding portion. 4. The packaging bag according to claim 1, wherein said packaging bag comprises at least an outer layer and an inner layer.
The small space portion communicates with the outside of the packaging bag to form air in the packaging bag when the packaging film is formed of a synthetic resin film that constitutes an outer layer of the layered product. The cutout for forming a vent is formed so as to cross the small space at a corner side of the small space so as to form a vent to be pulled out. The packaging bag described in Crab. 5. The packaging bag according to claim 4, wherein the cut for forming the vent is formed so as to be continuous with the cut for forming the vent. 6. A notch for forming an opening to be a tearing start end for forming an opening for taking out the contents accommodated in the large space portion is formed at a predetermined position on a peripheral edge of the thermal bonding portion of the packaging bag. The packaging bag according to any one of claims 1 to 5, wherein: 7. An opening for forming an opening so as to form an opening for taking out the contents accommodated in the large space portion when a packaging bag is formed in a film made of a synthetic resin constituting an outer layer of the laminate. The packaging bag according to any one of claims 1 to 6, wherein the cut is formed at a predetermined position. 8. The packaging bag according to claim 7, wherein the notch for forming the opening is connected to the notch for forming the opening. 9. The method according to claim 4, wherein the cut for forming the vent or the opening for forming the opening is at least one continuous or discontinuous cut line formed by a pulsed laser. A packaging bag according to any of the above. 10. A protruding thermal bonding portion protruding from each of the edge thermal bonding portions is formed so that one of the thermal bonding portions covers the other, and bleeds the air in the packaging bag toward the corner of the small space portion. When the vent is provided, the air in the large space portion is configured not to flow linearly from the communication port formed by the one protruding thermal bonding portion and the other protruding thermal bonding portion in the vent. The packaging bag according to claim 1, wherein: 11. An island-shaped buffer heat bonding portion having a length longer than the communication port is formed at a position of the small space portion or the large space portion facing the communication port, and the buffer heat bonding portion is formed. The gap between the protrusion and the protruding heat bonding portion is configured such that a sphere having a diameter of 5 mm is at least movable, and when a vent for bleeding air from the packaging bag is provided at the corner of the small space portion, the vent 2. The packaging bag according to claim 1, wherein the air in the large space portion is configured not to flow linearly.