JP3745072B2 - Microwave packaging bag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a microwave oven packaging bag that performs cooking in a packaging bag.
[0002]
[Prior art]
Instead of taking frozen frozen foods, chilled foods, etc. out of the packaging bags and transferring them to tableware and simply cooking them in a microwave oven, the packaging bags can be used as cooking utensils, and the whole packaging bag can be cooked in a microwave oven as it is or tableware There is a growing need for serving meals instead of food. This can be done by replacing the packaging bag instead of tableware, saving the time for dishing and washing, and depending on the food, the packaging bag may be heated at high internal pressure and steamed for a while with heated steam. This is because there are foods that can be eaten more deliciously. In order to meet such needs, packaging design must be made for each food menu so that optimum cooking is completed in the packaging bag. However, most microwave packaging bags simply wrap the contents and open a portion of the packaging bag to prevent rupture in the microwave just before heating, or automatically release heated steam. A ventilation hole is formed.
Regarding the latter, for example, Japanese Patent Laid-Open No. 63-138975 shown in FIG. 4A, Japanese Patent Laid-Open No. 4-40005 shown in FIG. 4B, and Japanese Patent Laid-Open No. 8-80979 shown in FIG. 4C. There are examples of publications and the like, and in each case, a vent hole is opened in the side seal portion. In the case of FIG.4 (b), it opens from the front-end | tip part of the side seal where stress concentrates.
In general, the basic shape of the packaging bag generally used is the pillow packaging bag and the four-side seal bag, and the finished shape is often square.
[0003]
[Problems to be solved by the invention]
However, the packaging bags proposed in each of the above publications are not suitable for cooking such as high-temperature cooking of the contents or cooking of the contents food for a while at a high temperature because there is no internal pressure resistance. There's a problem.
In addition, because the side seal part is provided with a vent, there is no problem in the case of solids, but when cooking food with a lot of moisture is packed directly without using a tray, the liquid juice is heated and steamed from the vent. The problem of blowing out together and polluting the inside of the microwave oven occurs.
In addition, there is a problem of burning or discoloration in a portion where microwaves are likely to concentrate, such as a viscous food that tends to remain at the corner of the packaging bag, or an irregular food corner.
The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a packaging bag for a microwave oven in which the contents food is difficult to burn, there is no squirt of juice, and high-temperature heating or steaming is continued with high pressure. .
[0004]
[Means for Solving the Problems]
The present invention made to solve the above problems
The inner contour line of the peripheral seal part of the packaging bag that contains food and is cooked as it is in a microwave oven is a curve at least at the corner part and the back seal part of the packaging bag,
By forming a vent by tearing the protruding piece provided in the peripheral seal part of the packaging bag,
In the back seal portion, an arcuate region defined by the inner contour line and a straight line connecting both ends thereof is weakly bonded so as to be peelable,
Match the tear direction of the protruding piece and the straight cut direction of the film having straight cut property in at least one direction used for the packaging bag;
Apply weakening along the tear line of the protruding piece,
Consists of.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in more detail with reference to the drawings.
FIG. 1 is an explanatory view when a four-side sealed bag of a microwave oven packaging bag according to the present invention is used.
Fig.1 (a) is a top view of the four-way seal bag 10-1 by this invention.
As shown to Fig.1 (a), as for the four-side seal bag 10-1 by this invention, the inner side outline of the side seal part 2 is exhibiting the curve in the four corners of a packaging bag at least. The two upper and lower laminated films 1 constituting the four-side seal bag are firmly bonded to each other at the side seal portion 2 (shown by diagonal lines). Such a contour line which is nearly circular as a whole can be easily obtained by changing the shape of the heat seal bar. In addition, a protruding piece 3 is connected to one side along the flow direction of the raw film indicated by a large arrow through a tear line 6, and a ventilation hole 4 is formed across the tear line 6. Shaped heat seal.
The thickness, number, pitch, and the like of the vent holes 5 are appropriately determined according to the microwave heating conditions of the content food.
The mounting position of the protruding piece 3 and the vent hole 4 may be any of the four sides as long as the protruding piece 3 can be torn, but it is preferably provided on the side along the flow direction of the original film. . Moreover, the protrusion piece 3 may be provided in multiple places.
The contents are filled in the central circular portion with one of the four-way seals being opened, and finally the filling side is sealed, and the four sides are completely sealed as shown by the hatched lines in FIG. This part is strongly bonded and cannot be peeled off.
Therefore, if the protruding piece 3 is torn from the notch 6 along the tear line 5 before the four-side sealed bag 10-1 is heated by the microwave oven, the vent hole 4 for releasing the heated steam to the outside can be formed. . By providing this, the four-side sealed bag 10-1 can be prevented from bursting in the microwave oven, and the internal pressure and heating temperature can be reduced according to the total opening area (see FIG. 1B). Can be controlled.
In order to take out the contents that have been cooked under optimum conditions, the packaging bag 10-1 may be cut along the cut line 7 from the notch 6.
A film having a straight cut property in at least one direction is used for the base material layer of the raw fabric, and the straight cut direction is generally an arrow direction, and the tear line 6 and the tear line 7 are easily torn in the arrow direction. ing.
Instead of a film having a straight cut property in at least one direction, a half cut line from the surface by laser processing or the like may be formed in advance at the position of the tear line 5 and the cut line 7.
In addition, when using a film that has a straight cut property in at least one direction, an infinite number of scars are provided on either of the left and right sides in FIG. May be.
[0006]
FIG. 1B is a side view showing a state in which the internal pressure is increased.
Since the shape of the storage part of the four-side seal bag 10-1 approaches a spherical shape, unlike the conventional four-side seal bag with corners, the content covering area is reduced, and the internal stress due to internal pressure is substantially equal to the inner wall. As a result, the pressure resistance is improved, and the contents can be cooked at a high temperature accordingly.
Further, by eliminating the corners, the heating is also made uniform, and the occurrence of charring and discoloration due to excessive heating is extremely reduced.
[0007]
As shown in FIG. 1 (b), the vent hole 4 of the four-sided seal bag 10-1 is not at a high position, and thus has no effect of preventing the squirt of the juice. It can process suitably as target food.
Further, the thickness, length, and number of the vent holes 4 may be appropriately selected depending on foods that do not want to release moisture from the contents, foods that can be eaten deliciously when steaming time is increased by high-heat steam. As a matter of course, when the total area of the vent holes 4 is increased, the condition becomes the same as that in the case of transferring to tableware and heating without a packaging bag.
[0008]
FIG. 2 is an explanatory view when a pillow packaging bag is used for the microwave packaging bag according to the present invention.
The pillow packaging bag 10-2 according to the present invention is obtained by side-sealing both end portions of a cylindrical body that is affixed by a back seal, and is used with the back seal portion S facing up. FIG. 2A is a plan view of the pillow packaging bag 10-2, and the back seal portion S is laid in either direction.
As shown in FIG. 2 (a), the pillow packaging bag 10-2 according to the present invention is deformed as indicated by the hatched portion so that the inner contour lines of the side seal portions 2 at least at the four corners of the packaging bag are curved. Heat sealed and strongly bonded. Accordingly, when the internal pressure is increased and the internal space is expanded, the central filling space is expanded. However, in the case of the pillow packaging bag 10-2 according to the present invention, the four-side sealed bag 10-1 according to the present invention is used. In addition, means for making it closer to a spherical shape is provided. This is the configuration of the back seal portion S, which will be described in the next column.
Further, the projecting piece 3 is connected to the back seal portion S formed along the flow direction of the raw film indicated by the arrow through the tear line 5, and is passed through the tear line 5 by a comb heat seal. A pore 4 is formed.
Therefore, by tearing the tear piece 3 from the notch 6 along the tear line 5 before heating in the microwave oven, the vent hole 4 for releasing the heated steam to the outside can be formed, and the burst in the microwave oven can be prevented. It can be prevented. The number and size of the vent holes 4 may be determined as appropriate according to the heating conditions of the content food.
When cooking is finished, the packaging bag 10-2 can be opened along the cut line 7 to take out the contents.
In addition, in order to tear smoothly according to the tear line 5 and the cut line 7, the tear direction and the straight cut direction of the original base material layer may be matched as described above, or a half cut line from the surface should be provided. May be.
[0009]
FIG. 2 (b) is a side view of the pillow packaging bag 10-2 according to the present invention during cooking. As shown in FIG. 2B, the back seal portion S that has been laid rises, and the vent hole 4 comes to the top portion of the packaging bag. Therefore, even if the content is rich in moisture, it is very rare to be ejected from the vent hole 4 together with the heating steam.
Further, in the case of this pillow packaging bag, the back seal portion S is defined by the strong adhesion portion 8 whose inner contour line is curved inward and presents a curved shape, and the inner side thereof, that is, the straight line L connecting the inner contour line and both ends thereof. The arcuate portion is indicated by a dotted dot, and this arcuate portion constitutes a weakly bonded portion 9 that is weakly bonded in a peelable manner.
The weakly bonded portion 9 is provided in order to release the heated steam from the vent hole 4 to the outside only when the internal pressure increases and reaches a predetermined level. As the weakly bonded portion 9 is peeled off, the internal space becomes more spherical. Such is shown by FIG. 2 (b), and the weakly bonded part peeled off is indicated by 9 '.
Therefore, until the weakly bonded portion 9 is peeled off, the contents can be processed in a state where the heated steam is stored inside at a higher temperature and higher pressure. In addition to shortening the heating time, it is possible to contribute to the development of new foods that can be eaten even more deliciously by completely cooking the half-cooked food in a pillow packaging bag.
As the means for weak adhesion in the weak adhesion part 9, strong adhesion is made in a dotted line shape with an appropriate size and pitch on the straight line L connecting both ends of the contour line, and the contents do not enter the weak adhesion region. As described above, the weak adhesive portion 9 may be partially coated with a low melting point heat sealant, or the adhesive strength may be lowered by a cross-cut seal or the like. This latter means can be simultaneously heat-sealed with the same heat-seal bar at the same time as the strong adhesion portion 8.
[0010]
FIG. 3 is an explanatory view when a self-supporting bag is used for the microwave oven packaging bag according to the present invention.
Although the bottom B of the self-supporting bag 10-3 according to the present invention is not spherical, but is formed in a ship shape close to a spherical surface, the inner shape of the ship shape is used as it is, but the inner contour of the shoulder is curved. Such a heat seal bar is used for strong adhesion, and the projecting piece 3 is connected to the head via a tear line 5, and a comb-like heat seal is formed across the tear line 5. Therefore, if the protruding piece 3 is torn along the tear line 5 before being heated in the microwave oven, the vent hole 4 for releasing the heated steam to the outside can be formed at the top, preventing the explosion in the microwave oven. It can be done.
Moreover, after heat-processing with a microwave oven, if a shoulder part is cut off with the cut line 7, it can open.
According to this self-supporting bag 10-3, it is further away from the sphere than the four-side sealed bag 10-1 and the pillow packaging bag 10-2, but the heating is made more uniform than the conventional self-supporting bag, and there is no scorching. The splash of liquid juice is the least.
In addition, in order to tear smoothly according to the tear line 5 and the cut line 7, the tear direction and the straight cut direction of the original base material layer may be matched as described above, or a half cut line from the surface should be provided. May be.
The vent hole 4 does not necessarily have to be a straight line in the vertical direction as shown in FIG.
In the case of the self-supporting bag 10-3, the shape of the packaging bag is suitable for a viscous product such as a carrero, and exhibits an excellent function particularly when dispensing after cooking.
[0011]
The laminated film 1 used for the microwave packaging bag 10 according to the present invention may be selected in consideration of packaging suitability such as rigidity, barrier properties, puncture resistance, etc. that are desired to be given to the packaging bag, depending on the type of food in the contents. Well, for example, the laminated structure is as follows in order from the outside.
ON15 / DL / PEF
ON15 / DL / CPP50
ON15 / DL / LLDPEF50
OPP15 / DL / LLDPE
OPP15 / CPP50
PET12 / DL / ON15 / DL / CPP50
PET12 / DL / ON15 / DL / LLDPEF50
PET12 / DL / OPP / CPP
Each symbol means the following material, and the number indicates the thickness of each layer in μm.
ON: stretched nylon CPP: unstretched polypropylene OPP: stretched polypropylene PET: polyethylene terephthalate PEF: polyethylene film LLDPEF: linear low density polyethylene DL: dry laminate adhesive It is preferable to use a film having a straight cut property in at least one direction. As a base film having a straight cut property in at least one direction, it is stretched in a uniaxial direction or a biaxial direction. For example, a biaxially stretched special nylon film (trade name, manufactured by Idemitsu Petrochemical Co., Ltd.) "Uniathlon") can be used. This is an environmentally friendly barrier base material that retains the practical strength peculiar to nylon resin, has excellent straight-cut properties in the flow direction, has easy tearability, and does not contain chlorine. is there.
The foods targeted by the microwave oven packaging bags according to the present invention are wide, and include a wide range of foods such as boiled, retorted cooked or semi-cooked foods, as well as cooked frozen foods that are simply heated and eaten.
When oxygen barrier properties are required during storage, a silicon oxide vapor deposition layer, an ethylene / vinyl alcohol copolymer layer, or the like may be interposed in the above laminated structure.
[0012]
【Example】
ON15 / DL / LLDPEF50 stacking structure, which is commercially available as a frozen food that has been cooked, is taken for 6 minutes (600 W), and the “Chinese rice cake” with an internal capacity of 180 g is taken out from a normal four-side sealed bag. Is transferred to a four-side sealed bag 10-1 according to the present invention in which the diameter of the circular storage portion is approximately 150 mm, and four vent holes 5 having a width of 3 mm and a length of 10 mm are provided at equal intervals. Instead, when microwave heating was performed, it was found that heating to an appropriate temperature that can be eaten deliciously in 5 minutes.
When the pillow packaging bag 10-2 according to the present invention was used, the heating time was further shortened to 3.5 minutes.
In either case, the swelled into a nearly spherical shape in the microwave oven, and the steam was smoothly discharged from the vent.
In addition, no scorching was observed even after the proper heating time.
On the other hand, when the same “Chinese bowl” was transferred to tableware or heated on rice, it took 6 minutes as specified to get ready to eat.
In addition, no splashing from the vents due to the heated steam of the juice was observed in the case of the pillow packaging bag or the self-supporting bag.
[0013]
【The invention's effect】
According to the microwave packaging bag 10 of the present invention, the packaging bag swells into a nearly spherical shape in the microwave oven, and a substantially uniform internal pressure is applied to the inner wall. Therefore, the packaging bag has the same specification as the conventional angular packaging bag. Despite being a packaging bag, it can withstand higher pressures. Therefore, since the inside of the packaging bag can be heated to a higher temperature, not only the cooking time can be shortened, but also a means for developing a new food can be provided.
Since the contents are held in a space close to a spherical shape, the heating is performed substantially uniformly and there is no burning.
In addition, it is possible to provide an appropriate inner diameter and the number of vent holes, and furthermore, the jet of heated steam can be stopped by the weak adhesion portion 9 until a certain internal pressure is exceeded. Adjustment, high temperature heating or steaming can be performed. Since the ventilation hole can be provided at the highest position of the packaging bag, the juice is not ejected together with the heating steam, and the microwave oven can be used in a clean state.
Since the packaging bag for microwave ovens according to the present invention can be manufactured by simply changing the seal shape, there is no need to install a special manufacturing apparatus other than the seal type, and the filling and packaging machine can be kept as before, and the new equipment No investment is required.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram when a four-side sealed bag of a microwave packaging bag according to the present invention is used. FIG. 2 is an explanatory diagram when a pillow packaging bag of a microwave packaging bag according to the present invention is used. [Fig. 4] An explanatory diagram of the microwave oven packaging bag according to the present invention when the self-standing bag is used. [Fig. 4] An explanatory diagram of a conventional microwave oven packaging bag. [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Laminated film 2 Side seal part 3 Projection piece 4 Vent hole 5 Tear line 6 Notch 7 Cut line 8 Strong adhesion part 9 Weak adhesion part 10-1 Four-way seal bag 10-2 by this invention Pillow packaging bag 10- by this invention 3 Self-standing bag L according to the present invention Straight line connecting both ends of the contour line S Back seal part

Claims (4)

Food was housed, as the inner contour of the peripheral sealing portion of the packaging bag to be cooked in a microwave oven, at least the corners of the packaging bag, I curve der in the back seal portion and peripheral seal of said packaging bag microwave packaging bag, characterized in Rukoto is formed vents by tearing the protruding piece provided on the part.   The packaging bag for a microwave oven according to claim 1, wherein an arcuate region defined by the inner contour line and a straight line connecting both ends of the back seal portion is weakly bonded to be peelable.   The microwave oven according to any one of claims 1 to 2, wherein a tearing direction of the protruding piece coincides with a straight-cutting direction of a film having straight-cutting properties in at least one direction used for the packaging bag. Packaging bags.   The microwave packaging bag according to any one of claims 1 to 3, wherein a weakening process is performed along a tear line of the protruding piece.

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