JP4997759B2 - Microwave packaging bag - Google Patents

Description

The present invention does not cause peeling due to pressure or impact applied during transportation or storage, and also reduces the internal pressure automatically without rupturing when the contents are packaged when heated in a microwave oven. The present invention relates to a packaging bag for a microwave oven.
More specifically, it is used for hermetically wrapping the contents of solids, liquids, and viscous materials, and the steam is quickly discharged without the contents blowing out of the bag, providing superior hygiene and safe cooking. The present 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. A self-supporting microwave packaging bag configured to have a notch or the like in an unsealed portion surrounded by a cylindrical seal portion is disclosed. (For example, refer to Patent Document 1).
As shown in FIG. 10, the microwave packaging bag of Patent Document 1 forms a peeling portion 24 by peeling 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. The steam reaches the unsealed portion 19 surrounded by the U-shaped seal portion, and the steam is discharged from the steaming port 17 formed in the unsealed portion.
JP 2005-59872 A

  However, in the conventional packaging bag, the pressure in the packaging bag is heated when the packaging bag containing the content is heated in the microwave oven by using the type of the contents cooked in the microwave oven or the microwave oven with high output. As a result of the rapid rise, as shown in FIG. 11, there may be a case where the lower end of the U-shaped seal portion 9 peels back from the vicinity of the steaming port 17, and when the steam is discharged, There was a drawback that liquids and viscous bodies such as certain carreaux and sauces were blown out of the bag.

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 And provided with at least one steaming opening in the portion surrounded by the U-shaped seal portion, and the outer periphery of the U-shaped seal portion and / or the inner side of the U-shaped seal portion. Is a packaging bag for a microwave oven, which is formed by a weak seal portion.

  Moreover, the microwave oven packaging bag of the present invention is the microwave oven packaging bag according to the above structure, wherein the weak seal portion has a strength in the range of 1 N / 15 mm or more and 23 N / 15 mm or less. is there.

  Further, in the microwave oven packaging bag of the present invention, in any one of the above configurations, the weak seal portion is formed in a range of 3 mm or more and less than 20 mm from the peripheral portion of the U-shaped seal portion. There is a packaging bag for a microwave oven.

  The microwave packaging bag according to the present invention may further include the packaging bag according to any one of the above-described configurations, wherein the packaging bag is folded in a reverse V shape on the front surface and the bottom surface of the quadrangle constituting the body portion. A self-supporting packaging bag in which the front part, the rear part, and the peripheral part of the bottom face are respectively heat sealed to form a peripheral seal part, and the bottom part expands back and forth with the filled contents and can stand on its own. There 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, the packaging bag for microwave ovens of the present invention can prevent the liquid and mucus from the contents such as carreru and sauce from adhering to the vicinity of the U-shaped seal part, and the contents are filled into the packaging bag. When the sealed package is heated in a microwave oven, if the internal pressure of the packaging bag exceeds a predetermined value, a weak seal portion is formed on the outer periphery of the U-shaped seal and / or on the inner side of the U-shaped seal portion. By forming the opening, the opening does not become abrupt as compared with the case where the weak seal portion is not formed, and the opening is gently performed, so that the contents can be prevented 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.
FIG. 4 is an explanatory view of a formation position of the U-shaped seal portion 9 in the microwave packaging bag 1 of the present invention, and FIG. 5 is formed in the outer peripheral portion of the U-shaped seal portion 9. FIG. 6 is a view showing the weak seal portion 16A, FIG. 6 is a view showing the weak seal portion 16B formed in the inner portion surrounded by the U-shaped seal portion 9, and FIG. Furthermore, it is a figure which shows the seal | sticker part 18 formed in order to prevent that the content blows out to the downward side of a steaming port, FIG. 8 shows as a steaming port formed inside the U-shaped seal | sticker part 9. FIG. FIG. 9 is a cross-sectional view taken along the line XX in FIG. 1, and FIGS. 10 and 11 are U-shaped seals of a conventional packaging bag for a microwave oven. FIG. 12 is a schematic view for explaining the peeling and opening of the part 9, and FIG. 12 is a state of being housed in an outer packaging box of a microwave packaging bag. It is explanatory drawing for making it stand in a state.

FIG. 1 is a perspective view showing an embodiment of a packaging bag 1 for a microwave oven according to the present invention.
The packaging bag for microwave oven 1 according to the present invention uses a laminate composed of at least an inner sealant layer, faces the inner sealant layer facing each other, and folds them or two of them. Overlap, further heat seal the peripheral edge portion to provide a seal portion to constitute a bag body, and further provide a U-shaped seal portion 9 connected to the body seal portion 6 to provide a U-shaped seal At least one steaming port 17 is provided on the inner side surrounded by the portion 9, and further, the outer peripheral portion of the U-shaped seal portion 9 and the inner side of the U-shaped seal portion are formed by weak seal portions 16 A and 16 B. It is a packaging bag.
The form of the microwave packaging bag 1 according to the present invention includes, for example, a side seal type, a two-side seal type, a three-side seal type, a four-side seal type, an envelope-attached seal type, and a palm-attached seal type (pillow seal type). It is possible to manufacture various types of packaging bags according to the present invention by heat-sealing with a pleated seal type, flat bottom seal type, gusset type, standing pouch type, etc.
As an embodiment of the packaging bag 1 for a microwave oven according to the present invention, as shown in FIG. 1, the bottom surface 4 is folded in an inverted V shape on the bottoms of the front surface 2 and the rear surface 3 that form the body. Then, the peripheral portions of the front surface 2, the rear surface 3 and the bottom surface 4 are heat sealed to form the body seal portion 5 and the bottom seal portion 6, and after filling the contents, the top seal portion 7 is This is a self-supporting packaging bag that is sealed by heat sealing and can be self-supported by expanding the bottom surface 4 back and forth with the filled contents.
When the packaging bag 1 for a microwave oven according to the present invention is a self-supporting packaging bag, it can be heated in a microwave oven while the packaging bag is in a self-supporting state, and can be easily taken out from the microwave oven, and can be safely removed. Even if it is liquid, it is a preferable bag form because it is easy for consumers to take out the contents.

In the present invention, when the microwave packaging bag 1 according to the present invention is a flat packaging bag other than a self-supporting bag, as shown in FIG. The packaging bag can be housed in such a manner that the packaging bag can be self-supporting and can be cooked in a microwave oven.
In addition, as the above-mentioned self-supporting assisting means 30, sleeve-shaped cardboard or the like having a shape that exposes the steaming means formed in the packaging bag to the outside is used, and the self-supporting assisting of the packaging bag is accommodated in this. Can be made.
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 configuring the steaming means formed in the packaging bag 1 to be exposed to the outside, the means for improving the refrigeration efficiency and for venting the steam and preventing the contents from blowing out are provided 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.
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.

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. Since it passes between the seal part or the top seal part and the independent seal part, it is difficult to efficiently apply pressure to the independent seal part, which is not preferable because automatic opening does not occur smoothly. 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. 5, the U-shaped seal portion 9 has a protruding end 20 that protrudes from the lowermost end of the seal portion. Is preferred.
If the protrusion 20 is formed, the shape is not limited to a U-shape, and although not illustrated, a trapezoidal shape or a triangular shape may be used.
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 oven packaging bag 1 according to the present invention, the unsealed portion 19 or the weakly sealed portion 16B surrounded by the strong seal U-shaped seal portion 9 is formed in the unsealed portion 19. Even if the positions where the steaming ports 17 and 18 are formed are shifted, the distance at which the seal peels and retreats is constant, and the steaming port formed in the unsealed portion 19 when the peeling reaches the unsealed portion 19. Since the openings 17 and 18 can be wide open at once, there is an advantage that when the heating is performed in a microwave oven, the steam can be surely, 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 of the same strong seal as the U-shaped seal portion is formed, the steaming ports 17 and 18 are formed. When the position is shifted, the distance of the seal peeling and retreating is changed. As a result, the seal peeling is not always stable, which is not preferable.
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 oven packaging bag 1 according to the present invention, it is necessary to form the steaming ports 17 and 18 in the unsealed portion 19 in the U-shaped seal portion 9.
By forming the steam openings 17 and 18, the internal pressure rises due to the heating of the microwave oven, and then peels back from the lowermost end of the U-shaped seal portion 9, reaches the unsealed portion 19, and reaches the unsealed portion 19. The vapor filled in the bag is diffused out of the bag through the formed steam openings 17 and 18, the internal pressure of the bag can be reduced, and rupture can be avoided.
Next, the shape of the steaming openings 17 and 18 formed in the unsealed portion 19 surrounded by the U-shaped seal portion 9 is not particularly limited. For example, as shown in FIG. A notch 18 such as a U-shape or a notch 17 such as a circle, a triangle, or a rectangle can be formed.
The number of the notches 17 or the notches 18 is not limited to one and may be plural.
Further, as shown in FIG. 9, the steaming ports 17 and 18 may be provided so as to penetrate through two members constituting the opposed body parts, or may be provided only on one side.
The steam openings 17 and 18 can be formed by laser processing or punching.

FIG. 5 is a view showing a weak seal portion 16 </ b> A formed in the outer peripheral portion of the U-shaped seal portion 9, and FIG. 6 is a weak seal portion 16 </ b> B formed inside the U-shaped seal portion 9. FIG.
As shown in FIG. 5 or FIG. 6, the packaging bag 1 according to the present invention forms a weak seal portion 16 </ b> A on the outer peripheral portion of the U-shaped seal portion 9 or the U-shaped seal portion 9. In order to prevent the contents such as the source from adhering to the weak seal portions 16A and 16B by forming the weak seal portion 16B on the inner side, the content is prevented from blowing out when heated in a microwave oven. There is an advantage that can be.
As shown in FIG. 1, weak seal portions 16 </ b> A and 16 </ b> B may be formed on the outer peripheral portion of the U-shaped seal portion 9 and on the inner side of the U-shaped seal portion 9.
In addition, the packaging bag according to the present invention forms the weak seal portion 16A in the outer peripheral portion of the U-shaped seal portion 9 so that the U-shaped seal portion is gently peeled when heated in a microwave oven. Since it advances, there exists an advantage that it can suppress that the content blows out.
The seal strength of the weak seal portions 16A and 16B formed on the outer peripheral portion of the U-shaped seal portion 9 and / or the inner side of the U-shaped seal portion 9 is in a range of 1 N / 15 mm or more and 23 N / 15 mm or less. It is preferable that when the package is heated in a microwave oven, only the vapor is gently released and the content can be prevented from being blown out, and is preferably in the range of 10 N / 15 mm or more and 23 N / 15 mm or less. More preferably.
It should be noted that the seal strength of the trunk seal portion 5, the bottom seal portion 6 and the top seal portion 7 is 23 N / 15 mm or more, so that the peripheral seal portion can be prevented from peeling off when the packaging bag is heated in a microwave oven. Therefore, it is preferable.
When the strength of the weak seal portions 16A and 16B is less than 1 N / 15 mm, the effect of forming the weak seal portion cannot be exerted, and the content is peeled off from the weak seal portion during filling, retort sterilization, transportation and storage. Depending on the heating conditions of the microwave oven and the contents of the packaging bag, the U-shaped seal part peels off at once and the contents blow out, which is not preferable.
When the strength of the weak seal portions 16A and 16B exceeds 23 N / 15 mm, when the package is heated in a microwave oven, steam is not released smoothly, and the bag swells more than necessary due to the internal pressure of the bag. Since it may give a sense of fear and may break the bag, it is not preferable.
In addition, the formation range of the weak seal portions 16A and 16B is a range of 3 mm or more and less than 20 mm from the peripheral portion of the U-shaped seal portion. Can be released gently and the contents can be prevented from blowing out.
If the formation range of the weak seal portions 16A and 16B is less than 3 mm, the effect of forming the weak seal portion cannot be exhibited, and depending on the heating conditions of the microwave oven or the contents of the packaging bag, the U-shaped seal portion may suddenly Since it peels and the content blows out, it is not preferable.
When the formation range of the weak seal portions 16A and 16B is 20 mm or more, when the package is heated in a microwave oven, steam is not released smoothly, and the bag swells more than necessary due to the internal pressure of the bag. Since it may give a sense of fear and may break the bag, it is not preferable.
The weak seal portions 16A and 16B are not limited to solid seals as long as they are within the above-described range of seal strength, and may be, for example, a seal shape having a pattern such as a dot shape, a line shape, or a lattice shape.

As shown in FIG. 7, the means 23 for preventing the contents from being blown out when heated in a microwave oven is specifically below the steaming ports 17 and 18 and the steaming ports 17 and 18. It is necessary to arrange between the U-shaped seal portion 9 and, specifically, the overhang seal portion is formed integrally with the trunk seal portion 5 rather than being formed independently. It is easy to prevent the matter from being blown out of the bag through the steaming ports 17 and 18, and since it can be sealed with the peripheral seal part in one step, it is excellent in productivity of the sealing process, which is preferable.
The shape of the seal portion 23 integrally formed with the trunk seal portion 5 is not particularly limited, and can be, for example, a linear rod-shaped seal, a curved arc-shaped seal, a semicircular shape, or an elliptical shape. .
In addition, the direction in which the seal portion 23 integrally formed with the body seal portion 5 projects is not particularly limited, and although not illustrated, for example, the seal shape may be a horizontal direction, an upper oblique direction, or a lower oblique direction.
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 needs to be about 1.5 mm to 10 mm. Even if the above pressure is applied, the contents are preferably blown out of the bag, and only the vapor can be smoothly discharged out of the bag, which is preferable.
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, if an internal pressure is applied more than necessary, the contents made up of a granular solid, liquid, or viscous body are held below the seal part 23 protruding from the body seal part 5. Further, the U-shaped seal part 9 is peeled and retracted more than necessary, and the contents easily blow out of the bag through the steaming port 17, which is not preferable.
By providing the means 23 for preventing the contents from being blown out, it is possible to keep the contents such as liquid and mucilage such as carreru and sauce under the steam port, and as a result, a microwave oven Even if the heating conditions are higher than usual and the inner part of the U-shaped seal part peels back from the protruding part 20, it prevents the contents of liquids and mucilages such as curry and sauce from blowing out of the bag through the steaming port. At the same time, only the steam can be safely discharged through the steam openings 17 and 18.

Next, FIG. 2, FIG. 3 is sectional drawing of the laminated body 10 of the packaging material which forms the packaging bag 1 for microwave ovens of this invention.
The laminated body 10 which forms the packaging bag for microwave ovens of this invention laminates | stacks the base material layer 11 and the sealant layer 13 sequentially through the contact bonding layer 12, as shown in FIG.
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.

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 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.

Further, in the present invention, as shown in FIG. 3, an intermediate layer 14 may be provided between the base material layer 11 and the sealant layer 13, and the intermediate layer 14 is usually only the base material layer 11 and the sealant layer 13. Then, it is provided when the function as the packaging bag 1 cannot be fulfilled sufficiently.
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 the present invention, it is preferable to form a notch 22 for opening at the edge of the trunk seal portion 5 of the microwave packaging bag 1.
In this case, it is preferable to use a stretched film having a tearing directionality that is easy to tear in the lateral direction via the opening notch 22.
For example, an I-shaped notch or a V-shaped notch can be used as the opening 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.

Although not shown in the drawings, the microwave packaging bag 1 of the present invention forms a wide seal portion on the lower body seal portion 5 on the lower side of the U-shaped seal portion to form the holding means 21. Can do.
By this, when taking out the packaging bag after heating in the microwave oven, the consumer is not burned by the steam released from the notch 17 or the notch 18 in the U-shaped seal part 9, and the wide seal part 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. 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. , Excellent independence, can be safely removed from the microwave oven without being burned by the holding means, easy and safe to transfer the contents, excellent in store display effect, high productivity Those capable Lumpur machining.

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).
The laminated film 10 thus obtained was made into a bag by a heat seal method using a bag making machine so that the non-stretched polypropylene film surface as the sealant layer 13 became the inner surface.
First, two wall films of the front surface 2 and the rear surface 3 are overlapped with the sealant surface, and “the body seal portion 5, the U-shaped seal portion 9 connected thereto, the weak seal portion 16A, and the weak seal portion 16B are combined. It was heat-sealed once under the following conditions with an integrally formed sealing mold. Subsequently, heat sealing was performed twice with a “sealing die formed integrally with the body seal portion 5 and the U-shaped seal portion 9 connected thereto”.
As a result, using a bag making machine that is normally used, a weak seal portion is 3 mm from the peripheral portion of the U-shaped seal portion on the outer peripheral portion 16A of the U-shaped seal portion and the inner side 16B of the U-shaped seal portion. As mentioned above, it was able to form in the range below 20 mm.
After that, a notch 17 is formed as a steaming port 17 (diameter 5 mm) in the weak seal portion 16B surrounded by the U-shaped seal portion 9, and the film on the bottom surface 4 is folded inward to form a gusset form. The bottom seal portion 6 was heat-sealed with a boat bottom-shaped seal pattern.
As a result, a stand pouch having an outer dimension of height b 145 mm × width a 155 mm, outer dimension vertical d 23 mm × width c 15 mm of the U-shaped seal part (seal width; trunk seal part, bottom seal part, peripheral seal part of the top seal part) A self-supporting microwave packaging bag 1 according to the present invention shown in FIG. 4 having a width of 10 mm, a seal width of 3 mm of the U-shaped seal portion 9, and a weak seal portion of length f 30 mm × width e 20 mm) under the following conditions. did.
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 1600 W household microwave oven.
The microwave packaging bag 1 according to the present invention can be sealed with high productivity, and without falling on the rotated tray in the microwave oven, the peripheral seal portion is broken and the contents are not blown out. The steam quickly escapes from the steam port of the packaging bag 1 for microwave ovens, there is no dripping of the contents from the steam port of the packaging bag, no liquid is blown out of the contents, and consumers do not feel a sense of fear. It was a packaging bag that can be cooked safely and has excellent appearance and hygiene.

<Heat seal conditions>
1. Weak seal part 16A, 16B
Sealing temperature: 220 ° C., heating time 0.4 seconds, pressure 0.2 MPa.
2. U-shaped seal part Seal temperature: 220 ° C., heating time 0.4 seconds, pressure 0.2 MPa 3 times.
3. Peripheral seal portion Seal temperature: 220 ° C., heating time 0.4 seconds, pressure 0.2 MPa 3 times.

In Example 1, the same packaging material as in Example 1 is used except that the weak seal part 16 is formed only in the outer peripheral part of the U-shaped seal part and the inside of the U-shaped seal part is an unsealed part. Then, a packaging bag for a microwave oven according to Example 2 having the seal shape shown in FIG. 5 was produced by the same manufacturing method under the following heat seal conditions.
Specifically, using the laminated film 10 having the same layer configuration as in Example 1, the bag was made by a heat seal method using a bag making machine so that the non-stretched polypropylene film surface as the sealant layer 13 became the inner surface. .
First, two wall films of the front surface 2 and the rear surface 3 are overlapped with a sealant surface, and “a seal in which a body seal portion 5, a U-shaped seal portion 9 connected thereto, and a weak seal portion 16A are integrally formed. The mold was heat-sealed once under the following conditions. Subsequently, heat sealing was performed twice with a “sealing die formed integrally with the body seal portion 5 and the U-shaped seal portion 9 connected thereto”.
As a result, a weak seal portion is formed only in the outer peripheral portion 16A of the U-shaped seal portion within a range of 3 mm or more and less than 20 mm from the peripheral portion of the U-shaped seal portion, using a bag making machine that is normally used. I was able to.
After that, a notch 17 is formed as a steaming port 17 (diameter 5 mm) in the unsealed portion 19 surrounded by the U-shaped seal portion 9, and the film on the bottom surface 4 is folded inward to form a gusset form. The bottom seal portion 6 was heat-sealed with a boat bottom-shaped seal pattern.
As a result, a stand pouch having an outer dimension of height b 145 mm × width a 155 mm, outer dimension vertical d 23 mm × width c 15 mm of the U-shaped seal part (seal width; trunk seal part, bottom seal part, peripheral seal part of the top seal part) The self-supporting microwave packaging bag 1 according to the second embodiment of the present invention is manufactured under the following conditions: 10 mm, U-shaped seal portion 9 seal width 3 mm, weak seal portion length f 35 mm × width e 20 mm) did.
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 1600 W household microwave oven.
The microwave oven packaging bag 1 according to the second embodiment of the present invention can be sealed with high productivity, and the peripheral seal portion breaks the bag without falling over the rotated tray in the microwave oven, so that the contents are contained. Vapor quickly escapes from the steam port of the microwave packaging bag 1 without spilling, no dripping of the contents from the steam port of the packaging bag, no blowing out of the contents, and consumers are afraid It was a packaging bag that can be cooked safely without feeling, and has excellent appearance and hygiene.

<Heat seal conditions>
1. Weak seal part 16A
Sealing temperature: 220 ° C., heating time 0.4 seconds, pressure 0.2 MPa.
2. U-shaped seal part Seal temperature: 220 ° C., heating time 0.4 seconds, pressure 0.2 MPa 3 times.
3. Peripheral seal portion Seal temperature: 220 ° C., heating time 0.4 seconds, pressure 0.2 MPa 3 times.

In Example 1, except that the weak seal part 16B is formed only on the inner peripheral part of the U-shaped seal part, the same manufacturing method is used under the following heat seal conditions using the same packaging material as in Example 1. Thus, a microwave packaging bag according to Example 3 having a seal shape shown in FIG. 6 was produced.
Specifically, using the laminated film 10 having the same layer configuration as in Example 1, the bag was made by a heat seal method using a bag making machine so that the non-stretched polypropylene film surface as the sealant layer 13 became the inner surface. .
First, two wall films of the front surface 2 and the rear surface 3 are overlapped with a sealant surface, and “a seal formed by integrally forming a body seal portion 5, a U-shaped seal portion 9 connected thereto, and a weak seal portion 16 </ b> B. The mold was heat-sealed once under the following conditions. Subsequently, heat sealing was performed twice with a “sealing die formed integrally with the body seal portion 5 and the U-shaped seal portion 9 connected thereto”.
As a result, a weak seal portion is formed only in the outer peripheral portion 16B of the U-shaped seal portion within a range of 3 mm or more and less than 20 mm from the peripheral portion of the U-shaped seal portion using a bag making machine that is normally used. I was able to.
After that, a notch 17 is formed as a steaming port 17 (diameter 5 mm) in the weak seal portion 16B surrounded by the U-shaped seal portion 9, and the film on the bottom surface 4 is folded inward to form a gusset form. The bottom seal portion 6 was heat-sealed with a boat bottom-shaped seal pattern.
As a result, a stand pouch having an outer dimension of height b 145 mm × width a 155 mm, outer dimension vertical d 23 mm × width c 15 mm of the U-shaped seal part (seal width; trunk seal part, bottom seal part, peripheral seal part of the top seal part) The self-supporting microwave packaging bag 1 according to the third embodiment of the present invention is manufactured under the following conditions: 10 mm, U-shaped seal portion 9 seal width 3 mm, weak seal portion length f 35 mm × width e 20 mm) did.
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 1600 W household microwave oven.
The microwave packaging bag 1 according to the present invention can be sealed with high productivity, and without falling on the rotated tray in the microwave oven, the peripheral seal portion is broken and the contents are not blown out. The steam quickly escapes from the steam port of the packaging bag 1 for microwave ovens, there is no dripping of the contents from the steam port of the packaging bag, no liquid is blown out of the contents, and consumers do not feel a sense of fear. It was a packaging bag that can be cooked safely and has excellent appearance and hygiene.

<Heat seal conditions>
4). Weak seal part 16B
Sealing temperature: 220 ° C., heating time 0.4 seconds, pressure 0.2 MPa.
5. U-shaped seal part Seal temperature: 220 ° C., heating time 0.4 seconds, pressure 0.2 MPa 3 times.
6). Peripheral seal portion Seal temperature: 220 ° C., heating time 0.4 seconds, pressure 0.2 MPa 3 times.

[Comparative Example 1]
In Example 2, using the same packaging material as in Example 1 except that the weak seal part 16 was formed 2.5 mm long by 1.7 mm wide from the peripheral edge of the U-shaped seal part. A microwave oven packaging bag of Comparative Example 1 was produced by the method.

[Comparative Example 2]
In Example 2, except that the weak seal portion 16 is 21 mm long by 21 mm wide from the peripheral edge of the U-shaped seal portion, the same manufacturing method is used as in Comparative Example 2 using the same packaging material as in Example 1. A packaging bag for a microwave oven was prepared.

[Comparative Example 3]
In Example 1, the sealing conditions for forming the weak seal portion 16 in the outer peripheral portion of the U-shaped seal portion and in the U-shaped seal portion are as follows: seal temperature: 220 ° C., heating time: 0.4 seconds, pressure: 0. A packaging bag for a microwave oven of Comparative Example 3 was produced by the same manufacturing method using the same packaging material as in Example 1 except that heat sealing was performed 3 times at 2 MPa.

[Comparative Example 4]
In Example 1, the sealing conditions for forming the weak seal portion 16 in the outer peripheral portion of the U-shaped seal portion and in the U-shaped seal portion are as follows: seal temperature: 190 ° C., heating time: 0.4 seconds, pressure: 0. A packaging bag for a microwave oven of Comparative Example 4 was produced by the same manufacturing method using the same packaging material as in Example 1 except that heat sealing was performed once at 2 MPa.

After filling the packaging bags obtained in Examples 1 to 3 and Comparative Examples 1 to 4 with tomato curry and 205 g, the top seal part 7 was sealed and sealed, and retort sterilized at 121 ° C. for 30 minutes. A bag was made.
The package of tomato curry treated with retort sterilization obtained above is heated in a microwave oven with an output of 1600 W for 2.5 minutes, the liquid dripping from the steaming port of the packaging bag, 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) are used as the contents in the packaging bags obtained in Examples 1 to 3 and Comparative Examples 1 to 4, and after filling the packaging bags, Fifteen bags were produced by retort sterilization under the same retort conditions, and then heated in a microwave oven with an output of 1600 W for 3 minutes. The results are shown in Table 1.

About the laminated film used in Examples 1 to 3 and Comparative Examples 1 to 4, a 15 mm wide strip was cut to prepare a test piece, and the unstretched polypropylene film surfaces as a sealant layer were overlapped with each other, a seal temperature of 220 ° C., A sample heat-sealed once (a sample for measuring the heat seal strength of a weakly sealed portion) under a sealing condition of a heating time of 0.4 seconds and a pressure of 0.2 MPa, and a sample heat-sealed three times (a U-shaped seal portion) And a sample for measuring the heat seal strength of the peripheral seal portion), and heat-sealed once under the sealing conditions of a seal temperature of 220 ° C., a heating time of 0.4 seconds, and a pressure of 0.1 MPa (heat of Comparative Example 4). A sample for measuring seal strength) was prepared.
Thereafter, the peel strength was measured with a tensile tester (Orientec Co., Ltd.) to measure the peel strength, and the peel strength was defined as the heat seal strength.
The tensile speed was 300 mm / min, the knob interval was 50 mm, and the load cell was 5 kgf. The measurement results are shown in Table 1 below.
In Table 1, the heat seal strength per 15 mm (unit: N / 15 mm) is shown.

As a result, in the packaging bags 1 of Examples 1 to 3, the contents such as liquids such as carreru and sauce and viscous bodies did not adhere to the vicinity of the U-shaped seal part. In addition, the weak seal portion 16A is formed on the outer peripheral portion of the U-shaped seal portion 9 and the weak seal portion 16B is formed on the inner side of the U-shaped seal portion 9, thereby forming a conventional weak seal portion. Compared to a packaging bag that does not, when the package sealed with the contents filled in the packaging bag is heated with a microwave oven, the internal pressure of the packaging bag becomes a predetermined level or more, and the weak seal portions 16A and 16B are suddenly peeled back. In addition, since it peeled gently, it was possible to prevent the contents from being blown out.
Moreover, in the packaging bag 1 of Examples 1-3, when the internal pressure rises by heating with a microwave oven and the internal pressure of the cooking bag body becomes equal to or higher than a predetermined temperature by cooking, the steaming opening of the packaging bag 1 for the microwave oven The steam quickly escapes from the steam inlet 17, and the content blowout prevention means 16 provided in the vicinity of the steaming opening prevents the U-shaped seal portion 9 from being peeled and retracted. It was confirmed that the contents were not dripping from the vicinity of the entrance 17 and the contents were not contaminated, and the contents were cooked safely and the contents were taken out hygienically.
On the other hand, in the packaging bag of the comparative example 1, since the formation range of weak seal part 16A, B is less than 3 mm from the peripheral part of the said U-shaped seal part, from the U-shaped seal part 9 Although it was possible to prevent the contents from adhering to a range of less than 3 mm, when the output condition of the microwave oven was higher than usual, the U-shaped seal part 9 peeled off at once, and the contents of the There was a thing with the adhesion of dirt, which was not preferable.
Moreover, in the packaging bag of the comparative example 2, since the formation range of weak seal part 16A, B is 20 mm or more from the peripheral part of the said U-shaped seal part, it is a content around the U-shaped seal part 9. Although it was possible to prevent the objects from adhering, when the output conditions of the microwave oven were higher than usual, the steam escape was not released smoothly from the steaming port 17, so the packaging bag swelled more than necessary, and the consumer Since it gives a feeling of fear, it was not preferable.
Moreover, in the packaging bag of the comparative example 3, since the seal strength of the weak seal portions 16A and B exceeds 22.5 N / 15 mm, the content adheres around the U-shaped seal portion 9. Although it was possible to prevent, but when the output condition of the microwave oven is higher than usual, since the steam escape was not released smoothly from the steaming port 17, the packaging bag swells more than necessary, giving consumers a sense of fear, It was not preferable.
Moreover, in the packaging bag of the comparative example 4, since the seal strength of the weak seal portions 16A and B is less than 9.8 N / 15 mm, the contents adhere to the range of less than 3 mm from the U-shaped seal portion 9. However, when the output condition of the microwave oven is higher than usual, the U-shaped seal part 9 may be peeled off at once, and the contents may be adhered to the vicinity of the steaming port 17 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 10 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 weak seal part 16 currently formed in the outer periphery part of the U-shaped seal part 9. FIG. It is a figure which shows the weak seal part 16 currently formed in the inner part enclosed by the U-shaped seal part 9. FIG. In FIG. 5, it is a figure which shows the seal | sticker part 18 formed in order to prevent that the content blows out further to the downward side of a steaming opening. It is a figure which shows the shape of the notch 17 or the notch | incision 18 as a steaming opening formed inside 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 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 making it stand in the state accommodated in the exterior box of the packaging bag 1 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 Adhesive layer 13 Sealant layer 14 Intermediate layer 15 Print layer 16A Weak seal part 16B Weak seal part 17 Steaming opening (notch)
18 Steaming mouth (cutting)
19 Unsealed portion 20 Protruding end portion 22 Opening notch 23 Contents 24 Peeling portion 30 Self-supporting means

Claims (2)

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,
Above the packaging bag, as a means for venting steam by heating in a microwave oven, a U-shaped seal part is provided that is connected to the peripheral seal part and has a protruding end that protrudes from its lowermost end.
At least one steaming opening is provided in the part surrounded by the U-shaped seal part,
And the outer peripheral part of the U-shaped seal part and / or the inner side of the U-shaped seal part are formed by a weak seal part,
Furthermore, the formation range of the weak seal portion is a range of 3 mm or more and less than 20 mm from the peripheral portion of the U-shaped seal portion,
And the intensity | strength of said weak seal part exists in the range of 1N / 15mm or more and 23N / 15mm or less,
The microwave oven packaging bag is characterized in that the strength of the peripheral seal portion is in a range exceeding 23 N / 15 mm. The packaging bag is inserted into the bottom part of the front surface and the rear surface made of a quadrangle that constitutes the body part by folding the bottom surface in an inverted V shape, and heat-sealing the front surface, the rear surface, and the periphery of the bottom surface, respectively. The microwave oven packaging bag according to claim 1, wherein the packaging bag is a self-supporting packaging bag that forms a peripheral seal portion and can be self-supported by extending the bottom portion back and forth with the filled contents.

Images