JPH1129181A - Food packaging bag for microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make steam dischargable without any processing except setting the back seal part of a bag under upward condition by providing a peelably openable seal part for opening having a narrow seal width caused by the inner pressure of a packaging bag on a partial region of the back seal part of the packaging bag for a microwave oven made of a flexible packaging material film. SOLUTION: A seal part 2a for opening having a narrow seal width is provided on an approximately middle part in the longitudinal direction of the back seal part 2 of a packaging bag A in such a way that when heat cooking is performed in a microwave oven and an inner pressure of at least specified pressure is generated in the bag under sealed condition, the adhesively sealed inner faces are peeled off and opened each other. It is possible to set peelability and openability of the seal part 2a caused by the inner pressure generated in the bag by the narrowness of the seal width of the seal part 2a for opening. Steam filled in the bag can be rapidly discharged outside of the bag and breakage can be avoided without applying any processing except setting the back seal part under upward condition in the microwave oven.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food packaging bag for a microwave oven that hermetically seals and packages food to be cooked in a microwave oven.

[0002]

2. Description of the Related Art Conventionally, there is a sealed bag made of a soft wrapping material sheet made of a flexible synthetic resin film or a composite film for sealingly packing foods for microwave ovens.

[0003] Conventionally, foods containing seasonings and the like are hermetically sealed in a packaging bag made of soft packaging material, and the food is cooked in a microwave oven at a high frequency without being taken out of the packaging bag. In this case, the seasoning liquid and water vapor generated from the food are saturated in the bag, and the bag expands rapidly.

[0004] For this reason, unspecified portions of the bag are easily broken, and when the purpose is to cook the contents such as raw fish together with the seasoning solution, the seasoning solution spills to the outside or the bag expands rapidly. Risk of rupture in microwave oven.

Therefore, as shown in FIG. 6, for example, a flat bag-shaped hermetically sealed packaging bag A using a soft wrapping material 1 of a polyolefin film, the bottom seal portion of which is hermetically sealed at the bottom end. 3 and side seal portions 5 and 5 in which both right and left end portions are hermetically sealed, and a side seal formed in one side end portion of a sealed packaging bag in which contents are filled from an upper opening 1a. Part of the part 5 is provided with a narrow seal width part (opening seal part 5a that is peeled open by internal pressure) in which the sealant layer for bag making is provided with an easy peel function, and the part is destroyed by the steam pressure in the bag. In addition, there is a bag provided with a function of releasing water vapor to the outside.

In such a sealed packaging bag in which a narrow seal portion is provided in the side seal of the bag, the narrow seal portion at the side end of the bag is broken to release steam to the side.
The seasoning liquid in the bag is also easily released to the outside from the side of the bag at the same time.

In addition, in addition to the above, a hole is made in advance in the center of the bag instead of the side, and the bag is resealed with an adhesive tape. The tape is removed at the time of heating and cooking, and the hole is turned upward in that state. There is a bag having a function of releasing the water vapor in the bag out of the bag by cooking with heating.

[0008] In this method, since the water vapor is released upward from the center of the bag, the seasoning liquid in the bag is relatively difficult to be discharged to the outside of the bag. For example, the sealed bag making process becomes complicated, and the bag becomes expensive. In addition, there is a method in which a user uses a tool to open a vapor discharge hole immediately before heating with a microwave oven, but it is troublesome and troublesome.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a packaging bag in which food is hermetically sealed in a packaging bag made of a soft wrapping material together with a seasoning without heating the food in a microwave oven without removing the food from the bag. When cooking, except that the back seal portion of the bag is set in a microwave oven in an upward state, the steam filled in the bag can be quickly released to the outside of the bag without any processing on the packaging bag. Is to do so.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a food packaging bag for a microwave oven provided with at least a back seal portion, which is a packaging bag made by using a soft packaging material film 1. Seal portion 2a which can be peeled open by the internal pressure of a packaging bag formed with a narrow seal width in a partial area of
And a food packaging bag for a microwave oven.

The present invention also provides the food packaging bag for a microwave oven according to the present invention, wherein the opening seal portion 2a is provided in a partial area of the back seal portion 2 from an inner end of the back seal portion 2 to an outer end side. It is a food packaging bag for a microwave oven formed by providing an unsealed area 2b facing the same.

The present invention also provides the food packaging bag for a microwave oven according to the above invention, wherein the opening seal portion 2a is provided in a partial area of the back seal portion 2 at an inner end side of an outer end of the back seal portion 2. It is a food packaging bag for a microwave oven formed by providing an unsealed area 2b facing the same.

The present invention also provides the food packaging bag for a microwave oven according to the present invention, wherein the opening seal portion 2a is provided in a part of the back seal portion 2 at an inner end side of an outer end of the back seal portion 2. It is a food packaging bag for a microwave oven formed by providing a notch 2c facing the same.

The present invention also provides the food packaging bag for a microwave oven according to the present invention, wherein the opening seal portion 2a is provided in a partial area of the back seal portion 2 at an inner end side of an outer end of the back seal portion 2. It is a food packaging bag for a microwave oven formed by providing a cut line portion 2d toward the package.

The present invention also provides the food packaging bag for a microwave oven according to the present invention, wherein the opening seal portion 2a is provided in a partial area of the back seal portion 2 at an inner end side from an outer end of the back seal portion 2. Unsealed areas 2 from the inner end toward the outer end
b, Food packaging bags for microwave ovens formed by providing 2b.

The present invention also provides the food packaging bag for a microwave oven according to the present invention, wherein the unsealed areas 2b, which are provided from the outer end of the back seal portion 2 toward the inner end and from the inner end to the outer end, respectively. Among the 2b, the unsealed area 2b provided toward the inner end side from the outer end is a food packaging bag for a microwave oven having a larger unsealed area width.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A food packaging bag for a microwave oven according to the present invention is a packaging bag A having a shape as shown in the plan view of FIG.

In the packaging bag A of the present invention, a rectangular soft packaging material film 1 having a sealant layer (a heat-fusible resin layer capable of bonding and sealing the inner surfaces to each other by hot pressing) on its inner surface is formed by parallel folding. a, b are folded in three, and overlapped at an appropriate position such as a center portion or an end portion closer to the center portion, and the same inner surfaces of both ends of the three-folded soft packaging material film 1 are overlapped with each other in a palm-split form, The back seal portion 2 is formed by adhesively sealing the inner surface of the overlap with hot pressure.

At the lower end of the three-fold soft packaging material film 1, a bottom seal portion 3 is formed, which is adhesively sealed by heat and pressure in a direction perpendicular to the back seal portion 2. An unsealed upper opening 1a for filling an object is provided, and the top seal portion is formed by adhesively sealing with hot pressure later. The lower end of the back seal 2 that intersects with the bottom seal 3 and / or the upper end that intersects with the top seal 4 are superimposed on the bottom seal 3 and top seal 4, respectively. The bags may be integrally sealed and sealed, or may be separated from each other. Such a separated state occurs because the outermost film of the soft wrapping material film 1 used for bag making has a higher melting point than the innermost sealant layer, and is thus fused by a heat seal. .

An opening seal portion 2a having a narrow seal width is provided at a substantially middle portion of the back seal portion 2 in the longitudinal direction.

Since the opening seal portion 2a has a narrow seal width, when an internal pressure exceeding a predetermined pressure is generated in the sealed bag during microwave cooking, the adhesively sealed inner surfaces are separated from each other. The opening seal portion 2a can be opened, and the ease with which the seal portion 2a can be peeled open due to the internal pressure generated in the bag can be set by the narrow seal width of the opening seal portion 2a. .

The opening seal portion 2a is, for example, as shown in FIG.
As shown in FIG. 3, an inner end I-2 of the back seal portion 2 is provided in a part of the back seal portion 2 which is a substantially middle portion in the longitudinal direction.
It is formed by providing the unsealed area 2b toward the outer end O-2 side (from the inside of the packaging bag to the outside).

In the food packaging bag A for a microwave oven according to the present invention, when the internal pressure of a predetermined pressure or more is generated in the sealed bag, the opening seal portion 2a is reliably opened. A sealant layer that is more releasable than the sealant layer formed on the inner surface of the area other than the area 2a is formed on the inner surface of the area 2a, and when an internal pressure of a predetermined pressure or more is generated in the sealed bag, an adhesive seal is formed. It is desirable that the formed inner surfaces be easily separated from each other so that the opening seal portion 2a can be reliably opened.

Soft packaging material film 1 for making the packaging bag A
Is a laminated film (composite film) of two or more layers in which a sealant layer is formed at least on the innermost surface side (adhesive seal side), and as a synthetic resin of the innermost surface sealant layer, Suitable is a polyolefin resin such as polyethylene and polypropylene having a relatively low melting point and good heat fusion properties, and the sealant layer can be peeled off after heat sealing of the sealant layer by cohesive peeling (cohesive failure). The peel strength is 500
g / 15 mm to 1000 g / 15 mm is appropriate, and the synthetic resin laminated on the outer surface side thereof has a predetermined suitability as a packaging bag (gas barrier property, moisture permeability, tear strength, flexibility, etc.). There is no particular limitation as long as the synthetic resin is retained. In addition, the lamination example of the soft packaging material film 1 and its layer thickness are shown below. Polyethylene terephthalate (12 µm) / unstretched polypropylene (50 µm) unstretched polypropylene (CMPS
013C; manufactured by Tocelo Co., Ltd.) Nylon (15 μm) / Unstretched polypropylene (25 μm)
m) Unstretched polypropylene (TX254N; manufactured by Dainippon Ink Co., Ltd.) Polyethylene terephthalate (25 μm) / unstretched polypropylene (25 μm) unstretched polypropylene (TX25
4N; manufactured by Dainippon Ink Co., Ltd.)

In particular, by applying a heat-fusible synthetic resin having a higher melting point than the synthetic resin for the sealant layer to the inner surface of the area of the opening seal portion 2a,
The opening seal portion 2a can have an easy peeling / unsealing performance with certainty due to the internal pressure of the bag.

Further, on the inner surface of the area of the opening seal portion 2a,
By applying a silicone resin, paraffin, or a synthetic resin containing one or both of them, the opening seal portion 2a can have a reliable peeling / opening performance due to the pressure in the bag.

FIG. 2 (a) shows that a food packaging bag A for a microwave oven according to the present invention is filled with food for microwave cooking through an upper opening 1a, and the upper opening 1a is used as an inner sealant layer. FIG. 4 is a perspective view of a sealed packaging bag in which a top seal portion 4 is provided by adhesively sealing with hot and pressure to form a sealed package.

When the food in the sealed packaging bag is to be cooked by heating in a microwave oven, the packaging bag is placed on a tray made of paper or earthenware, with the back seal portion 2 facing upward. Set within range. Also, it is appropriate that the back seal portion 2 is first raised from the surface of the packaging bag and then placed in the microwave oven.

Water vapor is generated from the food and the seasoning liquid in the sealed packaging bag by heating by the microwave oven, and the packaging bag is expanded and saturated by the steam, and the internal pressure is generated in the bag and tension is applied to the film of the packaging bag. Hang on.

Then, as shown in FIG. 2 (b), due to the internal pressure and tension of the sealed packaging bag, pressure is applied to the unsealed area 3b from the inside of the packaging bag, and the sealing portion 2a of the back seal portion 2 is opened. The inner surface of the adhesively sealed film is peeled off, an opening 6 for exhaust is formed in the back seal portion 2, the hermetically sealed packaging bag is released from the hermeticity, and can be prevented from bursting. Since the opening 6 is formed on the upper surface of the packaging bag A, it is held in the packaging bag A.

Further, as another embodiment of the present invention,
As shown in FIG. 3 (a), the sealing portion 2 for opening the packaging bag A
a is attached to the back seal portion 2 in a partial area of the back seal portion 2.
From the outer end O-2 to the inner end I-2 side
It is formed by providing b.

Further, as another embodiment of the present invention, as shown in FIG. 3B, the opening seal portion 2a of the packaging bag A is provided in a partial area of the back seal portion 2. Notch 2c from outer end O-2 to inner end I-2 side of seal portion 2
Is formed.

As another embodiment of the present invention, as shown in FIG. 3 (c), an opening seal portion 2a of the packaging bag A is provided in a partial area of the back seal portion 2. From the outer end O-2 of the back seal portion 2 toward the inner end I-2 side,
It is formed by providing a cut line portion 2d cut into a continuous line or a dotted line.

In another embodiment shown in FIG. 3A, water vapor is generated from the food and the seasoning liquid in the sealed packaging bag A by heating by the microwave oven, and the packaging bag is expanded by the steam and saturated. As a result, an internal pressure is generated in the bag and tension is applied to the film of the packaging bag.

Then, due to the internal pressure and tension of the sealed packaging bag, tension is applied to the back seal portion 2 in the direction of peeling the seal over its entire length in the longitudinal direction, and peeling gradually occurs from the inner side to the outer side. .

At this time, the opening seal portion 2a having a narrow seal width is separated from the outer end O-2 of the back seal portion 2 toward the inner end I-2 at a point earlier than the other back seal portions 2. When the packaging bag A reaches the unsealed portion 2b as shown in FIG.
The opening 6 is formed in the same manner as in the embodiment shown in (b), and the sealing property of the packaging bag A is released, so that the packaging bag A can be prevented from bursting.

In the other embodiment shown in FIG. 3B, steam is generated from the food and seasoning liquid in the sealed packaging bag A by heating by the microwave oven, and the packaging bag is expanded and saturated by the steam. As a result, internal pressure is generated in the bag, and tension is applied to the film of the packaging bag.

Then, due to the internal pressure and tension of the sealed packaging bag, tension is applied to the back seal portion 2 in the direction of peeling the seal over the entire length in the longitudinal direction, and peeling gradually occurs from the inner side to the outer side. .

At this time, peeling of the opening seal portion 2a having a narrow seal width is formed in a direction closer to the inner end I-2 than the outer end O-2 of the back seal portion 2 at a point earlier than the other back seal portions 2. When the package bag A reaches the cutout 2c, the packaging bag A is opened, and FIG.
The opening 6 is formed in the same manner as in the embodiment shown in FIG. 7, and the sealing property of the packaging bag A is released, so that the packaging bag A can be prevented from bursting.

In another embodiment shown in FIG. 3C, heating by a microwave oven
Water vapor is generated from the food and the seasoning liquid in the sealed packaging bag A, and the packaging bag expands and saturates with the water vapor, thereby generating internal pressure in the bag and applying tension to the film of the packaging bag.

Then, due to the internal pressure and tension of the sealed packaging bag, tension is applied to the back seal portion 2 in the direction in which the seal is peeled over its entire length in the longitudinal direction, and peeling gradually occurs from the inner side to the outer side. .

At this time, the opening seal portion 2a having a narrow seal width is separated from the outer end O-2 of the back seal portion 2 toward the inner end I-2 at a point earlier than the other back seal portions 2. Upon reaching the cut line portion 2c, the inside of the packaging bag A communicates with the outside, whereby the sealing of the packaging bag A is released, so that the bursting can be avoided.

Further, as another embodiment of the present invention,
As shown in FIG. 4, the opening seal portion 2 a of the packaging bag A is
An unsealed area 2b is provided in a partial area of the back seal part 2 from the outer end O-2 to the inner end I-2 side of the back seal part 2, and the inner end I- of the back seal part 2 is provided. Outer end O than 2
This is formed by providing another unsealed area 2b toward -2 side.

The unsealed areas 2b, 2b provided from the outer end O-2 and the inner end I-2 in this manner.
Each of the unsealed widths DO and DI may be either large or small, or may be substantially equal.

The lengths LO and LI of the unsealed areas 2b and 2b may be either longer or shorter or substantially equal.
The unsealed area 2b on the inner end I-2 side is for improving the upright position of the back seal portion 2 when the packaging bag A is inflated, and the size of the packaging bag A (in other words, the length of the back seal portion 2). The length of the unsealed area 2b on the outer end O-2 side is determined by the internal pressure when the packaging bag A is inflated.
When a is peeled off, it is sufficient that at least the function of releasing the air in the bag A to the outside can be achieved.

However, in the present invention, as shown in FIG. 4, the unsealed width DO of the unsealed area 2b formed particularly from the outer end O-2 side is changed to the unsealed area provided from the inner end I-2 side. Large for the unsealed width DI of 2b (DO> D
I) is preferred.

In the present invention, the outer end O-2
Unseal length L0 of the unseal area 2b formed from the side
Is preferably shorter than the unsealed length LI of the unsealed area 2b provided from the inner end I-2 side.

As described above, the unseal widths DO, DI,
By appropriately setting the unseal lengths LO and LI, the internal pressure generated in the bag when heating and cooking in a microwave oven applies an appropriate tension to the film of the packaging bag, and the back seal portion 2 Can be accelerated, and the desired tension for peeling the seal of the opening seal portion 2a can be activated more quickly for the opening seal portion 2a than the top and bottom seal portions 3 and 4. Reliable peeling at the seal portion 2a can be caused.

In the packaging bag A shown in FIG. 4, the vertical length H, the horizontal width W, the width S of the back seal portion 2 (the length of the back seal portion 2 corresponds to the vertical length H), the outer When the width DO of the seal portion 2b and the width DI of the inner unsealed portion 2b are set, the following relationship is established. DO ≤ width DI Width of opening seal portion 2a = S-(DO + DI)

Then, in order to ensure that the adhesive seal strength is maintained in the sealing portion 2a for the opening of the packaging bag A filled with the contents, and that the opening of the packaging bag A is reliably peeled off by the internal pressure at the time of expansion in the heating cooking. Proper opening seal part 2
The width of a is, for example, 2 mm ≦ S− (DO + DI) ≦ 3.5 mm.

When the length L0 of the outer unsealed portion 2b and the length LI of the inner unsealed portion 2b are respectively set, the relationship for improving the rising of the back seal portion 2 when the packaging bag A is inflated is good. For example, the following relational expression can be set as the expression. LI / H = 0.5 to 0.9 For example, a specific example of the packaging bag A shown in FIG. 4 is shown below. H = 170 mm W = 160 mm S = 10 mm DO = 5 mm DI = 2 mm LO = 5 mm to 45 mm
LI = 110mm

FIG. 5 shows a packaging bag A of the present invention in which a back seal portion 2 is formed on the packaging bag A, a bottom seal portion 3 is formed at the lower end of the packaging bag A, and side seal portions 5 are formed on both left and right ends. 5 shows a packaging form in which 5 is formed;
The opening seal portion 2a of the back seal portion 2 is the same as that of the above-described embodiment of the packaging bag A of the present invention without the side seal portion 5.

[0053]

According to the food packaging bag for a microwave oven of the present invention, the food is hermetically packaged together with a seasoning in a packaging bag made of a soft packaging material, and the food is cooked in a microwave oven as it is without removing the food from the bag. Water vapor filled in the packaging bag without any processing except that the packaging bag is provided with an opening seal on the back seal and the back seal is set in a microwave oven with the back seal facing upward. Can be quickly released to the outside of the bag to avoid rupture, and the heated seasoning liquid or the like does not leak out because the opening is formed on the top surface of the bag. There is an effect that it can be favorably held within.

The food packaging bag for a microwave oven according to the present invention
At the end of cooking by microwave oven, the back seal part is opened by the saturated steam pressure inside the bag, and the film on both sides of the opening part is pulled to both outsides. Thus, there is an effect that the packaging bag can be easily and safely expanded and opened like a saucer without spilling the seasoning liquid or the like outside.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a food packaging bag for a microwave oven according to the present invention.

FIG. 2 (a) is a perspective view of a sealed packaging bag in which food is hermetically sealed using the food packaging bag for a microwave oven of the present invention, and FIG. 2 (b) illustrates the sealed packaging bag in a state of being heated and cooked in a microwave oven. Perspective view.

FIG. 3A is a perspective view showing another embodiment of the food packaging bag for a microwave oven according to the present invention, and FIGS. 3B and 3C are perspective views showing other embodiments.

FIG. 4 is a plan view showing another embodiment of the food packaging bag for a microwave oven according to the present invention.

FIG. 5 is a plan view showing another embodiment of the food packaging bag for a microwave oven according to the present invention.

FIG. 6 is a plan view of a conventional food packaging bag for a microwave oven.

[Explanation of symbols]

A: Food packaging bag for microwave oven 1: Soft packaging material film 2: Back seal part 2a: Seal part for opening with narrow seal width 2b: Unsealed area 2c: Notch part 2d: Cut line part 3
... Bottom seal part 4 ... Top seal part 5 ... Side seal part 5a ... Seal part for opening with narrow seal width 6 ... Peel opening part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hiroshi Sasaki, Inventor, 1-5-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (72) Sumio Abe 1-1-1, Taito, Taito, Taito-ku, Tokyo Letterpress Printing Co., Ltd.

Claims (7)

[Claims] 1. A packaging bag made by using a soft packaging material film 1 and provided with a food packaging bag for a microwave oven provided with at least a back seal portion. A food packaging bag for a microwave oven, comprising an opening seal portion 2a which can be peeled and opened by the internal pressure of the packaging bag formed as described above. 2. The opening seal part 2a is formed by providing an unsealed area 2b in a partial area of the back seal part 2 from the inner end of the back seal part 2 to the outer end side. The food packaging bag for a microwave oven according to claim 1. 3. The sealing portion for opening 2a is formed by providing an unsealed region 2b in a partial region of the back seal portion 2 from the outer end to the inner end side of the back seal portion 2. The food packaging bag for a microwave oven according to claim 1. 4. The opening seal portion 2a is formed by providing a cutout 2c in a partial area of the back seal portion 2 from the outer end to the inner end side of the back seal portion 2. Item 4. A food packaging bag for a microwave oven according to Item 1. 5. The opening seal portion 2a is formed by providing a cut line portion 2d in a partial area of the back seal portion 2 from the outer end to the inner end side of the back seal portion 2. Item 4. A food packaging bag for a microwave oven according to Item 1. 6. An unsealed area 2b is formed in a partial area of the back seal part 2 toward the inner end side from the outer end and toward the outer end side from the inner end of the back seal part 2. , 2
The food packaging bag for a microwave oven according to claim 1, which is formed by providing b. 7. In the unsealed areas 2b, 2b provided from the outer end to the inner end and from the inner end to the outer end of the back seal portion 2, the back seals 2 are provided from the outer end toward the inner end. 7. The unsealed area 2b has a larger unsealed area width.
The food packaging bag for a microwave oven as described in the above.