JPH10230978A - Packaging bag for microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a packaging bag for a microwave oven by which food can be heated and cooked at a high temperature in a short time by increasing the inner pressure and further, in which broth does not scatter through vent holes. SOLUTION: The inside outline of the seal part of the packaging bag containing food heated and cooked in a microwave oven as it is, is formed to have a curved line bent inward at the corners, the back seal part S, and the top seal part of the packaging bag. And a vent hole 3 is formed by tearing a projection 3 provided in the seal part which comes to a high level in the state the packaging bag has expanded. A bow-shaped zone 9 partitioned by the inside outline and the line L connecting both ends thereof in the back seal part S is peelably and weakly stuck.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag for a microwave oven which performs cooking in a packaging bag.

[0002]

2. Description of the Related Art Instead of taking out cooked frozen foods, chilled foods, etc. from packaging bags and transferring them to tableware and simply heating and cooking them in a microwave oven, the packaging bags are used as cooking utensils and cooked in a microwave oven together with the packaging bags. There is an increasing need to use the table as it is or transfer it to tableware. This means that if the packaging bag is replaced with tableware, it can be relocated, served, and hassle-free washing.In addition, depending on the food, the inside pressure of the packaging bag may be increased to an internal pressure, heated to a high temperature, or steamed with heated steam for a while. However, there are foods that can be eaten more deliciously. In order to respond to such needs, packaging design must be made for each food menu so that optimal 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 vent is formed. The latter is described, for example, in JP-A-63-1 shown in FIG.
No. 38975, JP-A-4-400 shown in FIG.
Japanese Patent Application Laid-Open No. 05-80579 and Japanese Patent Application Laid-Open No. 8-80979 shown in FIG. 4 (c), all of which have vent holes opened in the side seal portions. In the case of FIG. 4B, the side seal is opened from the tip of the side seal where the stress is concentrated. The basic shape of the packaging bag generally used is overwhelmingly the pillow packaging bag and the four-side seal bag, and the finished shape is often a square shape.

[0003]

However, the packaging bags proposed in the above publications are structurally insensitive to internal pressure, so that the contents are cooked at a high temperature or the contents are steamed for a while at a high temperature. There is a problem that such cooking is unsuitable. In addition, since there is a vent hole in the side seal part, there is no problem in the case of solids, but when cooking foods with a lot of moisture are packed directly without using a tray, the sap will be mixed with heated steam from the vent hole. A problem arises that the inside of the microwave oven is contaminated by blowing out air. In addition, there is a problem that the food is easily burnt or discolored in a portion where microwaves tend to concentrate, such as a viscous food which is likely to remain on a corner of the packaging bag and a corner of an irregular food. The present invention has been made in view of the above-described problems, and has as its object to provide a packaging bag for a microwave oven in which content foods are hardly scorched, sap is not spouted, and high-temperature heating or steaming is continued at high pressure. .

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The present invention is directed to a packaging bag for storing foods and heating and cooking in a microwave oven as it is. A straight line connecting the inside contour and both ends of the back seal is formed as a curved line at least at the corners and the back seal, tearing a protruding piece provided on the peripheral seal of the packaging bag. Weakly bond the arcuate area defined by
The tear direction of the projecting piece and the straight cutting direction of the film having the straight cutting property in at least one direction used for the packaging bag are matched, and the weakening line processing is performed along the tear line of the projecting piece. Configure.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings. FIG. 1 is an explanatory view of a case where a four-side seal bag of a packaging bag for a microwave oven according to the present invention is used. FIG.
(A) is a plan view of a four-side seal bag 10-1 according to the present invention. As shown in FIG. 1A, the four-side seal bag 10-1 according to the present invention has at least four corners of the packaging bag.
The inner contour of the side seal portion 2 has a curved line. The upper and lower two laminated films 1 constituting the four-side seal bag are firmly bonded at the side seal portions 2 (shown by oblique lines). Such a contour line having a shape close to a circle can be easily obtained by changing the shape of the heat seal bar. Further, a protruding piece 3 is connected to one side along the flow direction of the raw film indicated by the large arrow via a tear line 6, and a vent hole 4 is formed across the tear line 6. Heat seal. The thickness, number, pitch, etc. of the ventilation holes 5 are appropriately determined according to the microwave heating conditions of the content food. Projection piece 3
The mounting position of the vent hole 4 may be any of the four sides as long as the protruding piece 3 can be torn, but is preferably provided on the side along the flow direction of the raw film. Further, the projecting pieces 3 may be provided at a plurality of locations.
The contents are filled in the central circular portion with one of the four-side seals opened, and finally the filling side is sealed, and the four sides are completely sealed as shown by the oblique 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 seal bag 10-1 is heated by the microwave oven, the ventilation hole 4 for releasing the heated steam to the outside can be formed. By providing this, the four-side seal bag 1
0-1 can be prevented from bursting in the microwave oven, and the internal pressure and the heating temperature can be controlled according to the total opening area (see FIG. 1B). In order to take out the cooked contents under the optimum conditions, the packaging bag 10-1 may be cut along the cutout 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 material, and the straight cut direction is generally the direction of the arrow, and the tear line 6 and the cut line 7 are easily torn in the direction of the arrow. ing. Instead of the film having the straight cutting 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 positions of the tear line 5 and the cut line 7. When a film having a straight cut property in at least one direction is used, an infinite number of scars are provided on either of the left and right sides in FIG. 1A instead of the notch 6 so that the film can be torn from a desired position. You may.

FIG. 1B is a side view showing a state where the internal pressure is increased. Since the shape of the storage portion of the four-side seal bag 10-1 approaches a sphere, unlike the conventional four-side seal bag having a corner,
The covering area of the contents is reduced, and the internal stress due to the internal pressure is applied substantially evenly to the inner walls. As a result, the pressure resistance is improved, and the contents can be cooked at a high temperature correspondingly. Further, the elimination of the corners makes the heating uniform, and extremely reduces the occurrence of scorching and discoloration due to excessive heating.

The vent hole 4 of the four-side seal bag 10-1 is
As shown in FIG. 1 (b), since it is not at a high position, there is no squirting prevention effect, but corn,
Gyoza, Shumai, etc. can be suitably treated as target foods. Further, the thickness, length, and number of the ventilation holes 4 may be appropriately selected depending on foods that do not want moisture to escape from the contents and foods that can be eaten more deliciously when the steaming time by the high-temperature steam is increased. As a matter of course, as the total area of the ventilation holes 4 increases, the same conditions as in the case where the food is transferred to tableware and heated without a packaging bag are approached.

FIG. 2 is an explanatory view showing a case where a pillow packaging bag is used as a packaging bag for a microwave oven according to the present invention. The pillow packaging bag 10-2 according to the present invention is obtained by side-sealing both ends of a cylindrical body stuck with a back seal, and is used with the back seal portion S facing upward. FIG. 2 (a)
Is a plan view of the pillow packaging bag 10-2, and the back seal portion S is laid down in any direction. FIG. 2 (a)
As shown in the figure, the pillow packaging bag 10-2 according to the present invention comprises:
At least at the four corners of the packaging bag, the inner contour of the side seal portion 2 is deformed and heat-sealed as shown by oblique lines so as to be curved, and is strongly bonded. Therefore, as the internal pressure increases and the internal space expands, the central filling space expands.
In the case of 0-2, the four-side seal bag 10 according to the present invention is used.
Means for making the shape more spherical than -1 is provided.
It is in the configuration of the back seal part S.
This will be explained in the next column. Further, a protruding piece 3 is connected to a back seal portion S formed along the flow direction of the raw film indicated by an arrow via a tear line 5, and passes through the tear line 5 by a comb-shaped heat seal. Pores 4 are formed. Therefore, if the tear piece 3 is torn from the notch 6 along the tear line 5 before heating in the microwave oven, the ventilation hole 4 for releasing the heating steam to the outside can be formed, and the rupture in the microwave oven can be prevented. It can be prevented. The number and size of the ventilation holes 4 may be appropriately determined according to the heating conditions of the content food. After cooking,
The contents can be taken out by opening the packaging bag 10-2 along the perforation line 7. Further, in order to tear smoothly along the tear line 5 and the cut line 7, the tear direction and the straight cut direction of the base material layer of the raw material may be matched as described above, or a half cut line from the surface may be provided. You may.

FIG. 2B is a side view of the pillow packaging bag 10-2 according to the present invention at the time of cooking. As shown in FIG. 2 (b), the back seal portion S that has been laid up rises,
Vent 4 is at the top of the packaging bag. Therefore, even if the content has a large amount of water, it is extremely unlikely that the content will be ejected from the vent hole 4 together with the heated steam. Further, in the case of this pillow packaging bag, the back seal portion S is defined by the strong adhesive portion 8 whose inner contour is curved inward and presents a curved shape and a straight line L connecting the inner contour, that is, the inner contour and both ends. The arc-shaped area is represented by a dot, and the arc-shaped portion constitutes a weakly bonded portion 9 which is weakly bonded in a peelable manner. The weakly bonded portion 9 is provided for peeling off the heated steam from the ventilation hole 4 to the outside when the internal pressure increases and reaches a predetermined level. When the weak adhesive portion 9 is peeled off, the internal space further approaches a spherical shape. Such is shown by FIG. 2 (b), and the peeled weakly bonded portion is shown by 9 '. Therefore, the contents can be processed at a higher temperature and a higher pressure while heating steam is stored therein until the weak adhesive portion 9 is peeled off. In addition to shortening the heating time, by completely cooking a partially cooked food in a pillow packaging bag, it is possible to contribute to the development of a new food that can be eaten even more deliciously. As a means of weak bonding in the weak bonding portion 9, strong bonding is performed in a dotted line on a straight line L connecting both ends of the contour line with an appropriate size and pitch, and contents do not enter the weak bonding region. As described above, the weak bonding portion 9 may be partially coated with a low-melting-point heat sealing agent, or the bonding strength may be reduced by a grid seal or the like. This latter means is based on the strongly adhesive part 8
At the same time, heat sealing can be performed simultaneously with the same heat sealing bar.

FIG. 3 is an explanatory view when a self-standing bag is used as the packaging bag for a microwave oven according to the present invention. Although the bottom portion B of the self-standing bag 10-3 according to the present invention is not spherical, but is formed into a ship shape close to a spherical surface, the inner shape of the ship shape is used as it is, but the shoulder has a curved internal contour. Such a heat-sealing bar is used for strong bonding, and the protruding piece 3 is connected to the head via a tear line 5, and a comb-like heat seal is made across the tear line 5. Therefore, if the protruding piece 3 is torn along the tear line 5 before heating in the microwave oven, the vent hole 4 for allowing the heated steam to escape to the outside can be formed at the top, preventing rupture in the microwave oven. I can do it. In addition, after the heat treatment in the microwave oven, if the shoulder is cut off along the cutout line 7, it can be opened. According to the self-standing bag 10-3, it is farther from the sphere than the four-side seal bag 10-1 and the pillow packaging bag 10-2, but the heating is more uniform than the conventional self-standing bag, and no scorching is observed. The scattering of sap is the least. Further, in order to tear smoothly along the tear line 5 and the cut line 7, the tear direction and the straight cut direction of the base material layer of the raw material may be matched as described above, or a half cut line from the surface may be provided. You may. The ventilation hole 4 does not necessarily need to be a straight line in the vertical direction as shown in FIG. In the case of the self-standing bag 10-3, the shape of the packaging bag is suitable for a viscous material such as curry, and exhibits an excellent function particularly when dispensing after cooking.

The laminated film 1 used in the packaging bag 10 for a microwave oven according to the present invention is prepared according to the type of the food contained therein.
What is necessary is just to select in consideration of the appropriateness of packaging such as rigidity, barrier property, puncture resistance and the like to be imparted to the packaging bag. For example, the lamination structure is as follows 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 Means the following materials, and the numbers indicate the thickness of each layer in μm
Indicated by ON: stretched nylon CPP: unstretched polypropylene OPP: stretched polypropylene PET: polyethylene terephthalate PEF: polyethylene film LLDPEF: linear low-density polyethylene DL: dry laminate adhesive The base film of the packaging bag for a microwave oven according to the present invention includes:
It is preferable to use a film having a straight cutting property in at least one direction. The substrate film having a straight-cutting property in at least one direction is a film stretched uniaxially or biaxially. 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 material that has excellent straight cutability in the flow direction and easy tearing while retaining the practical strength unique to nylon resin, and does not contain chlorine etc. is there. The food to be covered by the microwave packaging bag according to the present invention is wide, and includes a wide range of foods, such as cooked or retorted cooked or semi-cooked foods, in addition to cooked frozen foods that are simply heated and eaten. In addition, when oxygen barrier properties are required during storage, a silicon oxide deposited layer,
An ethylene / vinyl alcohol copolymer layer or the like may be interposed in the above-mentioned laminated structure.

[0012]

EXAMPLE A designated cooking time of 6 minutes (in the case of 600 W), which is commercially available as cooked frozen food, and has a content of 180
g of “Chinese bowl” is taken out of a normal four-side seal bag, and the diameter of the circular storage part is approximately 15 using a laminated film having a laminated configuration of ON15 / DL / LLDPEF50.
0 mm, 3 mm wide and 10 mm long vent holes 5
Book, 4-side seal bag 10-1 provided at equal intervals according to the present invention
And heated in a microwave oven, it was found that it could be heated to the appropriate temperature for delicious eating in 5 minutes. Further, 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 each case, the mixture swelled into a shape close to a sphere in the microwave oven, and the steam was smoothly discharged from the ventilation holes. No scorching was observed even after the appropriate heating time had passed. On the other hand, when the same “Chukadon” was transferred to tableware, or heated on the same microwave while being put on rice, it took six minutes as specified to get ready to eat. In addition, scattering of the sap from the vent hole due to the heated steam was not observed in the case of the pillow packaging bag or the self-standing bag.

[0013]

According to the packaging bag 10 for a microwave oven according to the present invention, the packaging bag swells into a nearly spherical state in the microwave oven, and a substantially uniform internal pressure is applied to the inner wall. Compared with the packaging bag of the same specification, it can withstand higher pressure. Therefore, since the inside of the packaging bag can be heated to a higher temperature, the cooking time can be shortened, and a means for developing a new food can be provided.
Since the contents are held in a space close to a sphere, the heating is performed substantially uniformly and there is no scorching. In addition, since an appropriate inner diameter and the number of ventilation holes can be provided, and furthermore, the blowing of the heating steam can be stopped by the weak bonding portion 9 until a certain internal pressure is passed. Adjustment, high-temperature heating or steaming with steam can be performed. Since the ventilation hole can be provided at the highest position of the packaging bag, the microwave can be used in a clean state without squirting the juice with the heated steam. The packaging bag for a microwave oven according to the present invention can be manufactured simply by changing the seal shape, so that there is no need to install a special manufacturing device other than the seal type, and the filling and packaging machine can be the same as the conventional one, and new equipment can be used. No investment is required.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a case where a four-side seal bag of a microwave packaging bag according to the present invention is used.

FIG. 2 is an explanatory view when a pillow wrapping bag of a microwave packaging bag according to the present invention is used.

FIG. 3 is an explanatory view when a self-standing bag of a packaging bag for a microwave oven according to the present invention is used.

FIG. 4 is an explanatory view of a conventional packaging bag for a microwave oven.

[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-side seal bag according to the present invention 10-2 Pillow packaging bag according to the present invention 10- 3. Self-standing bag according to the present invention L Straight line connecting both ends of contour line S Back seal part

Claims (5)

[Claims] 1. The electronic device according to claim 1, wherein an inner contour of a peripheral seal portion of the packaging bag for storing food and heating and cooking in a microwave as it is is a curve at least at a corner portion and a back seal portion of the packaging bag. Microwave packaging bag. 2. The packaging bag for a microwave oven according to claim 1, wherein a ventilation hole is formed by tearing a protruding piece provided on a peripheral seal portion of the packaging bag. 3. An arcuate region defined by said inner contour line and a straight line connecting both ends of said back seal portion is weakly adhered so as to be peelable. 3. The packaging bag for a microwave oven according to any one of 2. 4. The film according to claim 1, wherein a tearing direction of the projecting piece and a straight cutting direction of a film having a straight cutting property in at least one direction used for the packaging bag coincide with each other. A packaging bag for a microwave oven according to claim 1. 5. The packaging bag for a microwave oven according to claim 1, wherein a weakening process is performed along a tear line of the projecting piece.