JP5140921B2 - Microwave packaging bag - Google Patents

Description

The present invention does not peel off due to pressure or impact applied during transportation or storage, and does not cause rupture, with the contents wrapped and self-supporting when heated in a microwave oven. In particular, the present invention relates to a packaging bag for a microwave oven that can reduce the internal pressure.
More specifically, it is used for hermetically wrapping the contents of solids, liquids, and viscous bodies, and the steam is quickly discharged without the contents blowing out of the bag. This invention relates to a packaging bag for a microwave oven that can be sealed with high productivity and has an excellent display effect at a store.

In recent years, with the widespread development of microwave ovens and in response to the demand for simplified cooking, cooked processed foods are packaged in plastic packaging bags, etc., sealed, and distributed in a form that preserves them. ing.
However, when such foods are heated in a microwave oven, if the packaging bag remains sealed, the internal pressure in the bag increases due to the water vapor generated from the contents by heating, and eventually the contents are ruptured. It was often scattered in the range.
Prior to the filing of the present application, the applicant provided a U-shaped seal portion in connection with the top seal portion or the trunk seal portion as a packaging container that prevents such rupture of the packaging bag. Disclosed is a self-supporting microwave packaging bag configured to have a steaming opening in an unsealed portion surrounded by a cylindrical seal portion. (For example, refer to Patent Document 1).
As shown in FIG. 9, the packaging bag for microwave ovens of Patent Document 1 peels back from the lowermost end of the U-shaped seal portion 9 due to an increase in internal pressure when the microwave oven is heated. It reaches the unsealed portion initial arrival point 21 surrounded by, and the steam is discharged from the steaming port 17 formed in the unsealed portion.
Incidentally, the size of a conventional蒸通port holes, there varied from 3.1mm ² ~80mm ² degrees, were not designed in particular calculated.
In addition, the length from the conventional U-shaped seal part 9 to the steaming port 17 was a length of about 0 mm to 10 mm.
JP 2005-59872 A

  However, in the conventional packaging bag (Patent Document 1), by using a microwave oven with high output and the kind of contents to be cooked in a microwave oven, when heating a packaging bag containing the contents in a microwave oven, As a result of the sudden increase in the pressure in the packaging bag, as shown in FIG. 10, there is a case where the lower end of the U-shaped seal part peels back from the vicinity of the notch, and when the steam is discharged, the contents There is a drawback that liquids such as carreru and sauce and viscous bodies are blown out of the bag through the steaming port 17.

The purpose of the present invention is to prevent rupture even when heated in a microwave oven without detachment due to pressure or impact applied during transportation or storage, while packaging the contents and leaving the packaging bag self-supporting. It is a packaging bag for microwave ovens that can automatically reduce the internal pressure without causing it, it can seal and wrap the contents of solid, liquid, viscous material, has self-supporting stability, without spilling the contents, To provide a packaging bag for a microwave oven, in which steam is quickly discharged, can be cooked hygienically and safely, can be easily taken out from a microwave oven, can be sealed with good productivity, and has an excellent display effect at a store.
Among other things, the object of the present invention is to provide an electronic device that can discharge only vapor out of the bag without blowing out the liquid or sticky substance such as carreaux or sauce, even if the pressure in the bag is higher than necessary. It is to provide a packaging bag for a range.

Therefore, in order to solve the above-described problems, the microwave packaging bag according to the present invention is a bag for heating with a microwave oven, and uses a laminated film having at least one surface formed of a sealant layer, and sealant surfaces In the sealed packaging bag with the peripheral part sealed and facing, the U-shaped seal part connected to the peripheral seal part as means for venting steam by heating in the microwave oven above the packaging bag The unsealed portion surrounded by the U-shaped seal portion is provided with at least one steaming port, and from the steaming port to the unsealed portion initial arrival point of the U-shaped seal portion. , That is, the length to the lower right corner of the U-shaped seal part is 10 mm or more and 25 mm or less, and is heated in the vicinity of the steaming opening in the U-shaped seal part with a microwave oven. Contents when A seal portion for preventing the blowout is provided, and a seal portion for preventing the content from being blown out is formed below the steaming port surrounded by the U-shaped seal portion. The seal portion for preventing the contents from blowing out is formed integrally with the trunk seal portion, and the shape of the seal portion is not surrounded by the U-shaped seal portion from the trunk seal portion. Between the seal between the sticking tip part and the U-shaped seal part , which is sticking out in the seal part in the form of a linear stick seal, curved arcuate seal, semicircle or ellipse The shortest distance is 1.5 mm to 10 mm.

Moreover, the microwave oven packaging bag of the present invention is the microwave oven packaging bag characterized in that, in the above-described configuration, the size of the hole of the steaming opening is 12 mm ² or more and 51 mm ² or less. .

  Further, the microwave packaging bag of the present invention, in any one of the above-described configurations, when the circle centered on the center portion of the bag is drawn, the outermost portion of the U-shaped seal portion from the center of the bag. The microwave oven packaging bag is provided at a position where a radius of a circle in contact with an inner edge of the lower end is shorter than a radius of a circle in contact with an inner edge of the body seal portion.

  In addition, the microwave packaging bag of the present invention is characterized in that, in any of the above-described configurations, the lowermost end of the U-shaped seal part forms a protruding end with a protruding shape. It is a bag.

  Moreover, the packaging bag for microwave ovens of the present invention may further include any one of the above-described configurations, wherein the steaming port is formed so as to penetrate through two members constituting the packaging bag, or It is a packaging bag for microwave ovens, which is formed only on one side of two members constituting.

  Further, the microwave oven packaging bag of the present invention, in any one of the above-mentioned configurations, is inserted into the front surface and the bottom surface of the quadrangle constituting the body portion by folding the bottom surface in an inverted V shape, It is a self-supporting packaging bag in which the peripheral portion of the rear surface and the bottom surface is heat sealed to form a peripheral seal portion, and the bottom portion expands back and forth by the filled contents and can stand on its own. It is a packaging bag for a microwave oven.

In the packaging bag for microwave oven of the present invention, it is used for hermetically wrapping the contents of solids, liquids and viscous bodies, and can be cooked safely without spilling the contents. Steam does not rupture due to applied pressure or impact, and does not rupture when the contents are wrapped and the bag is self-supporting when heated in a microwave oven, and steam is quickly generated from the bottom of the U-shaped seal. It is discharged, can automatically reduce the internal pressure, has self-supporting stability, can easily and safely transfer contents, has an excellent display effect at stores, and has the advantage of being able to seal with good productivity .
Furthermore, when the microwave oven is heated in a state where the package body filled with the packaging bag and sealed is self-supported, when the internal pressure of the packaging bag exceeds a predetermined level, only steam is cut out from the bag as a steaming opening. Or, it can be discharged safely through a notch, and further, by forming the steaming port in a predetermined position and a hole in the steaming port in a predetermined size, the contents such as a carrero or sauce It is possible to prevent the liquid and mucus from being blown out.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of a microwave packaging bag 1 of the present invention, and FIG. 2 is a cross-sectional view of a laminate 10 of packaging materials forming the microwave packaging bag 1 of the present invention. FIG. 3 is a cross-sectional view of the laminate 10 of another embodiment of the packaging material forming the packaging bag.
Figure 4 is an explanatory view of a forming position of the U-shaped sealing portion 9 in the microwave packaging bag 1 of the present invention, FIG 5 is unsealed portion of the shaped sealing portion 9 of蒸通port 17 and co It is a figure which shows the shape of the seal part 16 for preventing that the content blows off between the initial arrival points 21, and FIG. 6 is formed in the unsealed part 19 surrounded by the U-shaped seal part 9. FIG. 7 is a diagram showing the shapes of a steaming port (notch) 17 and a steaming port (cut) 18, FIG. 7 is a cross-sectional view taken along the line XX of FIG. 1, and FIG. It is a schematic diagram explaining peeling opening of the U-shaped seal part 9 of the packaging bag 1 for microwave ovens, FIG. 9, FIG. 10 is peeling of the U-shaped sealing part 9 of the conventional packaging bag for microwave ovens It is a schematic diagram explaining opening.

FIG. 1 is a perspective view showing an embodiment of a packaging bag 1 for a microwave oven according to the present invention.
As shown in FIG. 1, a packaging bag 1 for a microwave oven according to the present invention is inserted into a bottom part of a front face 2 and a rear face 3 that form a body part by folding a bottom face 4 in an inverted V shape. 2, the rear surface 3 and the bottom surface 4 are heat sealed to form a body seal portion 5 and a bottom seal portion 6, and after filling the contents, the top seal portion 7 is heat sealed and sealed. It is a self-supporting packaging bag in which the bottom surface 4 can expand and contract independently by the filled contents.
Furthermore, the microwave packaging bag 1 according to the present invention is provided with a U-shaped seal portion 9 connected to the body seal portion 5, and steamed in an unsealed portion 19 surrounded by the U-shaped seal portion 9. A package having a configuration in which at least one passage 17 is provided and a length from the steam passage 17 to an unsealed portion initial arrival point of the U-shaped seal portion is 10 mm or more and 25 mm or less. It is a bag.
In the present invention, the microwave packaging bag 1 according to the present invention is not limited to the standing pouch shown in FIG. 1, and includes, for example, a side seal type, a two-side seal type, a three-side seal type, a four-side seal type, and an envelope-attached seal type. To produce various types of packaging bags according to the present invention by heat-sealing with a heat-sealing type such as a gas-sealed seal type (pillow seal type), a pleated seal type, a flat bottom seal type, a gusset type, etc. Can do.
The packaging bag 1 of various forms as described above uses a laminated body composed of at least the inner sealant layer 13 and folds the inner surface of the inner sealant layer 13 facing each other. A bag body can be formed by stacking two sheets and further heat-sealing the peripheral end portion to provide a seal portion.
In the case of the microwave packaging bag 1 according to the present invention, in the case of a flat packaging bag other than a self-supporting bag, an exterior packaging box is used, and the packaging bag is accommodated in the packaging bag so as to assist the packaging bag independence. It is possible to cook in a microwave oven.

Moreover, as said self-supporting auxiliary means 30, as shown in FIG. 11, the sleeve-shaped cardboard etc. which consist of the shape which exposes the steaming means formed in a packaging bag are used, and it is made to accommodate in this In this way, the packaging bag can be self-supporting.
The sleeve-like self-supporting auxiliary means 30 includes a front plate, a back plate, and a bottom plate that forms a gusset portion having a folded-back shape, and the front plate, the bottom plate, and the bottom plate A back plate is provided in order via a fold line, and the front plate and the bottom plate are configured by partially connecting each other at the upper end and the side end.
By constituting the steam outlet 17 formed in the packaging bag to the outside, it is possible to improve the refrigeration efficiency, and to provide means for venting the steam and preventing the contents from blowing out above the packaging bag. Since it can hold | maintain in the state located in this, even if the content is a liquid, it is preferable at the point which can be hard to discharge | emit from a packaging bag at the time of cooking.
In addition, as a material which comprises the packaging box for exteriors used as said independent support means 30, paper, a synthetic paper, the composite material which consists of paper and a plastics, etc. can be used.
As shown in FIG. 11, when the microwave packaging bag according to the present invention is erected using the means for assisting independence, the fold line can be folded and held in an erected state.
Further, as the self-supporting auxiliary means 30 other than the sleeve-shaped exterior packaging box, although not shown, the packaging bag has an opening perforation on the upper surface of the storage box, and an opening connected to the opening perforation on the side surface. An exterior packaging box having a configuration in which a perforation is provided and a fold line connected to the opening perforation on the side surface is provided on the bottom surface of the box can be used.
The self-supporting auxiliary means 30 stores the microwave packaging bag according to the present invention in the outer packaging box, cuts and opens the perforation for opening, and exposes the upper portion of the microwave packaging bag to the outside. In this state, the packaging bag is held at an angle from the bottom of the exterior packaging box that houses the packaging bag in an inclined state.
By using the outer packaging box, the steaming means can be held at a high position, so that the contents can be prevented from leaking from the steaming means of the packaging bag.

Next, FIG. 2 is a cross-sectional view of a laminated body 10 of packaging materials forming the microwave packaging bag 1 of the present invention.
As shown in FIG. 2, the laminate 10 forming the microwave packaging bag of the present invention is a laminate in which a base material layer 11 and a sealant layer 13 are sequentially laminated via an adhesive layer 12.
Note that the adhesive layer 13 is not an essential layer, but is a layer provided as necessary.
In addition, as shown in FIG. 3, an intermediate layer 14 and a printing layer 15 may be provided between the base material layer 11 and the sealant layer 13 as necessary.

In the microwave packaging bag 1 according to the present invention, the U-shaped seal portion 9 shown in FIG. 1 can be integrally sealed with the body seal portion 5 when the seal portion is formed on the periphery. It can be sealed with high productivity.
On the other hand, when the U-shaped seal portion 9 is not connected to the body seal portion 5 and is formed independently, the pressure of the steam generated by heating of the microwave oven is reduced. Because it passes between the seal part and the independent seal part formed independently of the top seal part, it is difficult to apply pressure to the independent seal part efficiently, and it is preferable because automatic opening does not occur smoothly. Absent. Furthermore, when the contents are filled or in the course of distribution, the contents enter between the independent seal portion and the body seal portion 5 or the top seal portion 7 to cause an appearance defect. Further, since the independent seal portion and the peripheral seal portion of the body seal portion 5 and the top seal portion 7 are sealed in two steps, the productivity of the seal processing is inferior, which is not preferable.

Next, in the microwave packaging bag 1 according to the present invention, the position where the U-shaped seal portion 9 is formed, as shown in FIG. 4, when a circle centered on the center of the packaging bag is drawn, The radius r3 of the circle that is in contact with the lowermost end of the U-shaped seal portion 9 from the center of the packaging bag 1 is the radius r1 of the circle that is in contact with the inner edge of the body seal portion 5 or the radius r2 of the circle that is in contact with the inner edge of the top seal portion 7. It is necessary to provide it at a position that is shorter than that.
On the other hand, if the radius r3 is longer than the radius r1 or the radius r2, the internal pressure increases due to heating of the microwave oven, and the internal pressure is applied to the body seal portion 5 and the top seal portion 7 which are the peripheral seal portions of the packaging bag. As a result, the body seal part 5 and the top seal part 7 are peeled and retracted, and the contents may leak due to the broken bag of the packaging bag.

Next, in the microwave packaging bag 1 according to the present invention, as shown in FIG. 1, the U-shaped seal portion 9 has a protruding end 20 that protrudes from the lowermost end of the seal portion. Is preferred.
This is preferable because the internal pressure due to heating is likely to be concentrated on the tip, and the peeling and retreat of the seal portion proceeds reliably and smoothly starting from the tip 20.
On the other hand, if the U-shaped seal portion 9 is circular or semicircular with no corners, the internal pressure generated by heating is dispersed, resulting in more pressure in the separation and retraction of the seal portion. This is not preferable because it is difficult to peel off smoothly and a larger pressure is applied to portions other than the U-shaped seal portion 9.
The seal width of the U-shaped seal portion 9 is preferably about 2 mm to 5 mm because the seal can be smoothly peeled off by internal pressure due to heating.
On the other hand, if the seal width of the U-shaped seal portion 9 is less than 2 mm, the seal strength becomes unstable, which is not preferable. If it exceeds 5 mm, it becomes difficult to peel off the seal smoothly due to internal pressure due to heating. It is not preferable.
Further, in the microwave packaging bag 1 of the present invention, the peripheral seal portion, that is, the seal width of the body seal portion 5, the bottom seal portion 6 and the top seal portion 7 is about 5 mm to 20 mm. It is preferable because it is not broken by pressure or impact applied during storage.

In addition, in the microwave packaging bag 1 according to the present invention, by forming the unsealed portion 19 surrounded by the U-shaped seal portion 9, formation of the steam ports 17 and 18 formed in the unsealed portion 19. Even if the position to be shifted is shifted, the distance at which the seal peels and retreats is constant, and when the peeling reaches the inside of the unsealed portion 19, the steam openings 17 and 18 formed in the unsealed portion 19 can be opened widely at once. Therefore, when heating in a microwave oven, there is an advantage that steam can be reliably, stably and promptly vented.
On the other hand, if the unsealed portion 19 surrounded by the U-shaped seal portion 9 is not formed and only the solid seal is formed, the distance of the seal peeling and retreating when the position where the steaming ports 17 and 18 are formed is shifted. As a result, it is not preferable because stable seal peeling is not always performed.
The steam openings 17 and 18 are inside surrounded by the U-shaped seal portion 9 and the body seal portion 5, so that the sealing performance can be completely maintained at the distribution stage, which is hygienic.

Next, in the microwave packaging bag 1 according to the present invention, the unsealed portion 19 in the U-shaped seal portion 9 needs to be formed with a notch 17 or a notch 18 as a steaming opening.
By forming the steaming opening, the internal pressure rises due to the heating of the microwave oven, and peels and retreats from the lowermost end of the U-shaped seal portion 9, reaches the unsealed portion 19, and is formed in the unsealed portion 19. The vapor filled in the bag is diffused to the outside of the bag through the steaming port, the internal pressure of the bag can be reduced, and rupture can be avoided.
Next, the shape of the steaming opening formed in the unsealed portion 19 surrounded by the U-shaped seal portion 9 is not particularly limited. For example, as shown in FIG. 6, a cross shape, an I shape, a U shape A cut 18 such as a circle, a triangle, a quadrangle, or the like can be formed.
The number of the notches 17 or the notches 18 is not limited to one and may be plural.
Moreover, as shown in FIG. 7, the notch 17 or the notch 18 which is a steaming opening may be provided so that it may penetrate to the two members which comprise the opposing trunk | drum, or may be provided only on one side.
The notch 17 or the notch 18 can be formed by laser processing or punching.

Next, in the microwave oven packaging bag 1 according to the present invention, the positions at which the steaming ports 17 and 18 are formed in the present invention are from the steaming ports 17 and 18 to the initial unsealed portion of the U-shaped seal portion. The length g up to 21 is 10 mm or more and 25 mm or less . This is because when the internal pressure rises due to heating in the microwave oven and the pressure inside the microwave oven bag body exceeds a predetermined level by cooking, the steam quickly escapes from the steaming opening of the microwave oven packaging bag 1, and the contents There is because it is possible to prevent the blowing out of the bag.
On the other hand, if the length g from the steam inlets 17 and 18 to the initial arrival point of the unsealed portion of the U-shaped seal portion 9 is less than 10 mm, the contents may be blown out of the bag. If it exceeds 25 mm, it is not preferable because it is difficult for the steam to escape smoothly due to the internal pressure due to heating.

Moreover, in the microwave packaging bag 1 according to the present invention, the size of the hole of the notch 17 which is a steaming opening in the present invention is 12 mm ² (hole diameter: 4 mmφ) or more and 51 mm ² (hole diameter: 8 mmφ). ) When the internal pressure rises due to heating in the microwave oven, and the pressure inside the microwave oven bag body exceeds a predetermined level due to cooking, it is promptly introduced from the steaming openings 17 and 18 of the microwave packaging bag 1 It is preferable because the vapor can escape and the contents can be prevented from blowing out of the bag.
In contrast, the magnitude of the U-shaped sealing portion 9 of the hole, 12 mm ² (pore diameter: 4 mm diameter) is less than, is not preferable because the contents are sometimes blown from outside the bag, 51 mm ² ( If the diameter exceeds the diameter of the hole (8 mmφ), it is not preferable because the steam is difficult to escape smoothly due to the internal pressure due to heating.

FIG. 5 is a view showing the shape of the seal portion 16 for preventing the contents formed inside the U-shaped seal portion 9 from blowing out.
In the microwave packaging bag 1 according to the present invention, it is necessary to provide a seal portion 16 in the vicinity of the steaming port 17 for preventing the contents from blowing out when heated in the microwave oven. .
As shown in FIG. 5, the seal portion 16 for preventing the contents from being blown out when heated in the microwave oven is specifically formed in a U-shape with the steaming port 17 below the steaming port 17. It is necessary to arrange it between the seal part 9 and it is formed integrally with the trunk part seal part 5, so that the contents can be placed outside the bag through the steaming opening. It is easy to prevent blowout, and since it can be sealed in one step with the peripheral seal portion, it is excellent in productivity of sealing processing, which is preferable.
As shown in FIG. 5, the shape of the seal portion 16 for preventing the contents integrally formed with the body seal portion 5 from blowing out is, for example, a linear stick seal or a curved arc-shaped seal. , Semicircular or elliptical.
Further, the direction in which the seal part 16 projects to prevent the contents integrally formed with the body seal part 5 from blowing out is not particularly limited, and is, for example, the horizontal direction, the upper oblique direction, or the lower oblique direction. It is good also as a seal shape.
Furthermore, the distance F between the seal part 16 and the U-shaped seal part 9 formed to prevent the contents from blowing out when heated in a microwave oven , that is, the contents are prevented from blowing out. The seal part for forming is formed integrally with the trunk part seal part, and the shape thereof is a straight bar-shaped seal in the unsealed part surrounded by the U-shaped seal part from the trunk part seal part, or , And projecting in a curved arcuate seal, semicircular or oval shape, and the shortest distance between the seal between the projecting tip and the U-shaped seal is 1.5 mm to 10 mm By doing so, even if an excessive pressure is applied, the contents are prevented from blowing out of the bag, and only the vapor can be smoothly discharged out of the bag.
When the distance F between the above seals is less than 1.5 mm, the steam passage is narrowed, the internal pressure cannot be smoothly discharged outside the bag, the bag swells, and may give the consumer a sense of fear. Absent.
When the distance F between the seals exceeds 10 mm, when the internal pressure is applied more than necessary, the content of the granular solid, liquid, or viscous body is prevented from blowing out from the body seal portion 5. Because the U-shaped seal part peels and retreats more than necessary, and the contents easily blow out of the bag through the steaming port. It is not preferable.

FIG. 8 is a schematic view for explaining peeling and opening of the U-shaped seal portion 9 of the microwave packaging bag 1 of the present invention shown in FIG.
As shown in FIG. 8, the length g to the unsealed portions initial arrival point-shaped sealing portion 9 of蒸通port 17 or Rako is, 10 mm or more, by at 25mm or less, the heating conditions of the microwave oven Even if the internal pressure is higher than usual and the peeled back from the unsealed part initial arrival point 21 of the U-shaped seal part, it prevents the contents made up of liquid and mucilage such as curry roux and sauce from the steam outlet to the outside of the bag. while, it is possible to safely discharge the only steam through the蒸通port 17.

  Moreover, since the packaging bag 1 for microwave ovens concerning this invention is a self-supporting packaging form, it can be heated with a microwave oven in the state which left the packaging bag self-supporting, and it is easy to take out from a microwave oven, and is safe. Even if the contents are liquid, it is easy for consumers to take out the contents.

Next, the constituent material of the laminated body 10 which forms the packaging bag 1 for microwave ovens of this invention is demonstrated.
First, the base material layer 11 is not particularly limited as long as it has heat resistance and is generally used as a packaging material for food that is heated or cooked in a microwave oven.
For example, stretched polyethylene terephthalate film, silica-deposited stretched polyethylene terephthalate film, alumina-deposited stretched polyethylene terephthalate film, stretched nylon film, silica-deposited stretched nylon film, alumina-deposited stretched nylon film, stretched polypropylene film, polyvinyl alcohol-coated stretched polypropylene film, nylon 6 / Metaxylylenediamine nylon 6 co-extrusion co-stretched film or polypropylene / ethylene-vinyl alcohol copolymer co-extrusion co-stretched film or the like, or a composite film obtained by laminating two or more of these films may be used.
These substrate layers may be single layers or multilayers (laminates), have a melting point and heat resistance of 150 ° C. or higher, and have a thickness of about 10 μm to 50 μm, preferably about 10 μm to 30 μm.

The resin constituting the sealant layer 13 in the present invention is not particularly limited as long as it is a heat-adhesive resin layer and is generally used as a food packaging material heated or cooked in a microwave oven.
For example, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid A resin such as a copolymer, an ethylene-methyl acrylate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-methyl methacrylate copolymer, or an ionomer can be used.
The sealant layer may be formed by extrusion lamination of these resins, or laminated in advance by a heat resistant substrate layer and dry lamination or extrusion lamination as a film formed by T-die method or inflation method. May be.
The thickness of the sealant layer is preferably about 20 μm to 100 μm, and more preferably 40 μm to 70 μm.
The seal strength between the sealant layers 15 is preferably 5 N / 15 mm width to 25 N / 15 mm width at a temperature of 90 ° C. or more, and more preferably 10 N / 15 mm width to 15 N / 15 mm width.
If the seal strength exceeds 25 N / 15 mm width at a temperature of 90 ° C. or higher, the seal retraction does not occur smoothly, automatic opening may not be achieved quickly and reliably, and the bag may be broken.
The state of seal retraction is not particularly defined, but cohesive failure is preferred.
Further, the seal strength between the U-shaped seal portion 9 and the peripheral seal portion, that is, the body seal portion 5, the bottom seal portion 6 and the top seal portion 7 may be different. However, even if they have the same strength, automatic opening is achieved by the shape described above.
Moreover, it is preferable that it has a seal strength of 23 N / 15 mm or more at normal temperature because it can be used without being peeled off by pressure or impact applied during transportation or storage.
The sealant layer 13 has a sufficient sealing strength especially at low temperatures (0 ° C.) and normal temperatures (25 ° C.), and has low sealing strength when heated in a microwave oven (90 ° C. or higher), and can be peeled off quickly. It is preferable to use a heat-adhesive resin layer comprising a resin composition containing a propylene-ethylene block copolymer resin as a main component.

Next, lamination | stacking with the base material layer 11 and the sealant layer 13 will not be specifically limited if it is methods, such as a coextrusion laminating method and a dry laminating method.
The adhesive layer 12 is an adhesive by lamination or an adhesive resin layer.
In the above, as the laminating adhesive, for example, one-part or two-part curable or non-cured vinyl type, (meth) acrylic type, polyamide type, polyester type, polyether type, polyurethane type, epoxy type, etc. It is possible to use adhesives for laminating such as rubber type, other solvent type, aqueous type, or emulsion type.
As a coating method of the adhesive for laminating, for example, direct gravure roll coating method, gravure roll coating method, kiss coating method, reverse roll coating method, fountain method, transfer roll coating method, and other methods can be used. .
As the coating ^{amount, 0.1g / m 2 ~10g / m} 2 ( dry state) position are ^{preferred, 1g / m 2 ~5g / m} 2 ( dry state) position is more preferred.
In the above, a resin layer made of a thermoplastic resin layer is used as the adhesive resin layer, and can be used for bonding the respective layers.

Specifically, the material of the adhesive resin layer includes a low density polyethylene resin, a medium density polyethylene resin, a high density polyethylene resin, a linear low density polyethylene resin, and ethylene / α-olefin polymerized using a metallocene catalyst. Copolymer resin, ethylene / polypropylene copolymer resin, ethylene / vinyl acetate copolymer resin, ethylene / acrylic acid copolymer resin, ethylene / ethyl acrylate copolymer resin, ethylene / methacrylic acid copolymer resin, Graft polymerization of unsaturated carboxylic acid, unsaturated carboxylic acid, unsaturated carboxylic acid anhydride, ester monomer to ethylene / methyl methacrylate copolymer resin, ethylene / maleic acid copolymer resin, ionomer resin, polyolefin resin, Or graft copolymerized resin, maleic anhydride to polyolefin resin It can be used sexual resin or the like.
These materials can be used alone or in combination.
The thickness of the resin layer is preferably about 10 to 30 μm.

Furthermore, in this invention, you may provide the intermediate | middle layer 14 between the base material layer 11 and the sealant layer 13, and the intermediate | middle layer 14 is the function as the packaging bag 1 only by the base material layer 11 and the sealant layer 13 normally. It is provided when it is not possible to sufficiently fulfill the above.
The above functions include gas barrier properties, mechanical toughness, bending resistance, puncture resistance, impact resistance, wear resistance, cold resistance, heat resistance, chemical resistance, etc., which are required as a packaging bag 1 These functions are achieved by providing the intermediate layer 14 as an intermediate layer 14.

Examples of the base material used as the intermediate layer 14 include polyolefins such as polyethylene terephthalate, polyamide, polyethylene, and polypropylene, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer. A film such as a saponified product, a film obtained by coating polyvinylidene chloride on these films, a film obtained by depositing an inorganic substance such as silicon oxide or aluminum oxide, or a film such as polyvinylidene chloride can be used.
One or more of these substrates can be used in combination.
It should be noted that the thickness of the base material only needs to satisfy the function required for the package, and can be appropriately selected as necessary.
In addition, when performing said lamination | stacking, if necessary, it can laminate | stack by performing pretreatments, such as a corona treatment, an ozone treatment, a flame | frame treatment, etc., for example.

  The above-mentioned surface pretreatment is carried out as a method for improving the adhesion and the like when laminating each resin film or sheet and each layer. As a method for improving the above adhesion, for example, A primer coat agent layer, an undercoat agent layer, an anchor coat agent layer, and the like can be arbitrarily formed in advance on the surface of various resin films or sheets to form a surface treatment layer.

Furthermore, in this invention, it is preferable to form the notch 22 in the edge of the trunk | drum seal | sticker part 5 of the packaging bag 1 for microwave ovens.
In this case, it is preferable to use a stretched film having a tearing directionality that is easy to tear laterally through the notch 22.

  In the above, as a heat sealing method, for example, a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, an ultrasonic seal, or the like can be used.

Incidentally, the microwave packaging bag 1 of the present invention, although not shown, the barrel seal portion 5 of the lower shaped seal portion of the co, that form a wide seal portion, and retaining means it can.
As a result, when the packaging bag is taken out after being heated in the microwave oven, the consumer is not burned by the steam discharged from the steaming openings 17 and 18 in the U-shaped seal portion 9, and the wide seal portion is Since it does not become hot compared with the surface portion of the bag film in contact with the contents, it can be removed safely and reliably.
In addition, as a seal width of the wide seal portion, about 10 mm to 20 mm is preferable because it can be taken out safely and reliably when the consumer takes out the packaging bag after heating with a microwave oven.

  Although not shown, the packaging bag 1 can be filled with liquid contents in addition to the solid contents. For example, solid foods such as frozen sushi, curry, soup, soy sauce, Various fluid foods such as sauces, soup stocks, spices, cooking liquors, fruit juices, water, etc., can be filled and packaged, and prescribed in a microwave oven with the bags left free when eating foods It can be cooked for a long time, and it prevents liquids and mucilages such as curry roux and sauce that are the contents from being blown out, and quickly discharges only the steam generated by heating, automatically reducing the internal pressure It is easy to stand, can be safely removed from the microwave oven without being burned by holding means, the contents can be easily and safely transferred, the display effect at the store is excellent, and the productivity is good It is those that can seal processing.

The present invention will be further described below with reference to examples and comparative examples.
A polyethylene terephthalate film having a thickness of 12 μm is used as the substrate layer 11, a 15 μm stretched nylon film is used as the intermediate layer 14, a 60 μm unstretched polypropylene film is used as the sealant layer 13, and the interlayer is urethane-based Dry lamination was performed with an adhesive, and the layers were sequentially laminated to prepare a laminated film 10 composed of a layer structure, a polyethylene terephthalate film (12 μm) / stretched nylon film (15 μm) / unstretched polypropylene film (60 μm).
Using the laminated film 10 obtained above, the body part is formed by heat-sealing the side edge portions of the two wall films of the front surface 2 and the rear surface 3 with the body seal part 5, and the body seal part 5 The U-shaped seal portion 9 and the seal portion 16 for preventing the contents from blowing out are integrally formed, and the unsealed portion 19 surrounded by the U-shaped seal portion 9 is further formed. After forming one notch 17, it is formed in a gusset form in which the film on the bottom surface 4 is folded inward, and the bottom seal portion 6 is heat-sealed with a boat bottom-shaped seal pattern. A self-supporting microwave packaging bag 1 in this form was manufactured. (Outer dimensions, height b: 145 mm, width a: 155 mm, c: 15 mm, d: 35 mm, g: 17 mm, notch diameter: 5 mm, seal width of U-shaped seal part: 3 mm, seal width of peripheral seal part : 10mm)
Using the packaging bag 1 obtained above, the contents were filled, the top seal portion 7 was sealed and sealed, and then retorted at 121 ° C. for 30 minutes.
The retort-treated package obtained above was placed in a self-supporting state and heated in a 700 W household microwave oven.
As a result, the microwave packaging bag 1 according to the present invention does not fall on the rotated tray in the microwave oven, and the peripheral seal portion breaks and the contents are not blown out. Steam quickly escapes from the steam port of the bag 1, there is no dripping of the contents from the steam port of the packaging bag, no liquid is blown out of the contents, and the consumer cooks safely without feeling afraid. The packaging bag was excellent in appearance and hygiene.

[Comparative Example 1]
In Example 1, the same packaging material as in Example was used except that the length g from the steaming port 17 to the unsealed part initial arrival point 21 of the U-shaped seal part 9 was 3 mm. The packaging bag for microwave ovens of the comparative example 1 was produced with the manufacturing method.

[Comparative Example 2]
In Example 1, except that the length g from the steaming port 17 to the unsealed part initial reaching point 21 of the U-shaped seal part 9 is 27 mm, The packaging bag for microwave ovens of the comparative example 2 was produced with the manufacturing method.

[Comparative Example 3]
In Example 1, except that the diameter φ of蒸通port 17 and 2 mm (3.1 mm ^2), using the packaging material as in the embodiment, the same microwave packaging bag of Comparative Example 3 in the production process Was made.

[Comparative Example 4]
In Example 1, the packaging bag for microwave ovens of the comparative example 4 of the comparative example 4 is manufactured with the same manufacturing method using the packaging material similar to an Example except the diameter (phi) of the steaming opening 17 being 10 mm (78.5 mm < ² >). Was made.

After filling 205 g of tomato curry sauce into the packaging bags obtained in Example 1 and Comparative Examples 1 to 4, the top seal part 7 was sealed and sealed, and 15 bags were sterilized at 121 ° C. for 30 minutes. Produced.
The package of tomato curry treated with retort sterilization obtained above is heated for 4 minutes in a microwave oven with an output of 700 W, the liquid dripping from the steaming port 17 of the packaging bag 1, and the vicinity of the steaming port of the packaging bag The state of soiling was observed.
Next, in the same manner, Chinese soup (195 g) and chige soup (190 g) were used as the contents of the packaging bags obtained in Example 1 and Comparative Example 1, and after filling the packaging bags, the same retort conditions were used. Then, 15 bags were sterilized by retort, and then heated in a microwave oven with an output of 1600 W for 3 minutes. The results are shown in Table 1.

As a result, in the packaging bag 1 of Example 1 provided with means 16 for preventing the contents from blowing out when heated in the vicinity of the steaming port 17 in the microwave oven, the internal pressure rises due to heating in the microwave oven, When the pressure inside the cooking bag becomes equal to or higher than a predetermined value due to cooking, steam can be quickly removed from the steaming opening 17 of the microwave packaging bag 1 and the contents can be prevented from blowing out. It was confirmed that there was no liquid dripping from the vicinity of the mouth 17 and no contamination of the liquid in the contents, and that the contents were cooked safely and the contents were taken out hygienically.
On the other hand, in the packaging bag of Comparative Example 1, there was a case in which liquid dripping of the content occurred from the steaming port 17 of the packaging bag, or contamination of the content was observed near the steaming port 17. .
Moreover, in the packaging bag of the comparative example 2, since steam release was not discharged | emitted smoothly, the seal | sticker peeling | exfoliation retreat might be carried out from the trunk | drum seal part, and it was not preferable.
Moreover, in the packaging bag of the comparative example 3, there was a thing in which the dripping of the content generate | occur | produced from the steaming port 17 of the packaging bag, or the adhesion of the content dirt was seen in the steaming port 17 vicinity.
Moreover, in the packaging bag of the comparative example 4, since steam release was not discharged | emitted smoothly, a seal | sticker peeling | exfoliation retreat might be carried out from the trunk | drum seal part 15, and it was not preferable.

  The microwave oven packaging bag of the present invention is used for filling and packaging foods and beverages and cooking for a predetermined time in a microwave oven. For example, contents containing liquid other than solid contents are used. For example, in addition to solid foods such as frozen cucumbers, various liquid foods such as curry, soup, soy sauce, sauce, soup stock, spices, liquor for cooking, fruit juices, water, etc. There is no particular limitation as it can be filled and packaged and cooked in a microwave oven.

It is a perspective view which shows the Example of the packaging bag 1 for microwave ovens of this invention. It is sectional drawing of the laminated body 10 of the packaging material which forms the packaging bag 1 for microwave ovens of this invention. It is sectional drawing of the laminated body of another aspect of the packaging material which forms a packaging bag. It is explanatory drawing of the formation position of the U-shaped seal part 9 in the packaging bag 1 for microwave ovens of this invention. It is a figure which shows the shape of the means 16 which prevents the content inside the U-shaped seal part 9 blowing out. It is a figure which shows the shape of the notch 17 or notch 18 formed in the unsealed part 19 enclosed by the U-shaped seal part 9. FIG. It is sectional drawing of the XX line of FIG. It is a schematic diagram explaining peeling opening of the U-shaped seal | sticker part 9 of the packaging bag 1 for microwave ovens of this invention of FIG. It is a schematic diagram explaining peeling opening of the U-shaped seal part 9 of the conventional packaging bag for microwave ovens. It is a schematic diagram explaining peeling opening of the U-shaped seal part 9 of the conventional packaging bag for microwave ovens. It is explanatory drawing for standing up in the state accommodated in the exterior box of the packaging bag for microwave ovens.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Microwave packaging bag 2 Front surface 3 Rear surface 4 Bottom surface 5 Body seal portion 6 Bottom seal portion 7 Top seal portion 8 Bottom film cutout portion 9 U-shaped seal portion 10 Laminate 11 Base material layer 12 seal portion for adhesive layer 13 sealant layer 14 intermediate layer 15 printed layer 16 contents to prevent blown Succoth (projecting seal portion)
17 Steaming entrance (notch)
18 Steaming mouth (cutting)
19 Unsealed portion 20 Protruding end portion 21 Unsealed portion initial arrival point 22 Notch 23 Contents 24 Peeling portion 30 Self-supporting means

Claims (6)

In a bag for heating by a microwave oven, using a laminated film composed of at least one side of a sealant layer, sealing the peripheral part with the sealant surfaces facing each other, and in a sealed packaging bag,
An unsealed portion surrounded by the U-shaped seal portion is provided above the packaging bag as a means for venting steam by heating in a microwave oven in connection with the peripheral seal portion. Equipped with at least one vent
And the length from the said steaming opening to the unsealed part initial arrival point of the said U-shaped seal part , ie, the length to the lower right corner of the U-shaped seal part is 10 mm or more and 25 mm or less Yes,
And, in the vicinity of the steaming opening in the U-shaped seal part, provided with a seal part for preventing the contents from blowing out when heated in a microwave oven,
And the seal part for preventing that the contents blows out is formed under the steaming opening surrounded by the U-shaped seal part,
And the seal part for preventing the contents from blowing out ,
It is integrally formed with the trunk seal part, and the shape thereof is a straight bar-shaped seal or a curved arc-shaped seal in the unsealed part surrounded by the U-shaped seal part from the trunk seal part, An electron that projects in a semicircular or elliptical shape, and the shortest distance between the seal between the projecting tip and the U-shaped seal is 1.5 mm to 10 mm Packaging bag for range. ^2. The microwave oven packaging bag according to claim 1, wherein a size of the hole of the steam opening is 12 mm ² or more and 51 mm ² or less.   When a circle centered on the center of the bag is drawn, the radius of the circle in contact with the innermost edge of the U-shaped seal portion from the center of the bag is larger than the radius of the circle in contact with the inner edge of the trunk seal portion. The packaging bag for microwave ovens according to claim 1, wherein the packaging bag is provided at a position that shortens the length.   The packaging bag for a microwave oven according to any one of claims 1 to 3, wherein a lowermost end of the U-shaped seal part forms a protruding end having a protruding shape.   The above-mentioned steaming opening is formed through two members constituting the packaging bag, or formed on only one surface of the two members constituting the packaging bag. The packaging bag for microwave ovens in any one of Claims 1-4 characterized by the above-mentioned. The packaging bag is inserted into the rectangular front part and the rear bottom part of the body part by folding the bottom part in an inverted V shape and heat-sealing the front part, the rear part and the peripheral part of the bottom part, respectively. The electronic device according to any one of claims 1 to 5, wherein the electronic device according to any one of claims 1 to 5, wherein the electronic device is a self-supporting packaging bag in which a peripheral seal portion is formed and the bottom portion expands back and forth by the filled contents and can stand on its own. Packaging bag for range.

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