JP2008081191A - Food packaging bag for heat cooking - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a food packaging bag for heat cooking that has superior openability after cooking, has no possibility of contaminating the surroundings when opening the bag and burning a hand, and can be used as a dish for receiving the food after opening the bag so that transferring the food from the bag to another dish can be omitted. <P>SOLUTION: The food packaging bag for heat cooking having a rectangular sheet, that is configured by laminating a base material layer, a middle layer and a sealant layer, is equipped with a back-side sealed portion sticking the rectangular sheet so that the rectangular sheet has a cylindrical shape with the sealant layer being inside, and an end sealed portion that seals an opening end portion of the cylindrical body formed by sticking. The back-side sealed portion is heat-sealed with a sealing strength less than that of the end sealed portion. The middle layer is made of a uniaxially oriented film, and the oriented direction thereof is perpendicular to a length direction of the back-side sealed portion. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a food packaging bag for heat cooking for performing heat cooking in a state of containing food, and relates to a food packaging bag for heat cooking excellent in openability after cooking.

DESCRIPTION OF RELATED ART Conventionally, the food packaging bag for heat cooking which can accommodate foodstuffs, such as a hamburger, can be put into a microwave oven as it is and is heat-cooked is known.
Such food packaging bags for cooking are usually in the form of a so-called palm joint, and a tear notch is often formed at the upper end of the bag (see, for example, Patent Document 1). When the food is taken out by opening the bag, it can be opened by tearing the bag by hand from the notch portion.

However, when opened by such a method, there is a possibility that food sacks or juices in the bag may spill and contaminate the surroundings. In addition, since the food after cooking is heated and heated, there is a risk of sacrificing burns due to dripping, juice, etc. attached to the hands of the unsealed person.
In addition, since it is necessary to transfer food from a bag to tableware after opening, it is troublesome for a single person who wants to eat as easily as possible.

In view of such a problem, a food packaging bag for cooking by heating that can open the bag largely from the back seal portion has been proposed (see Patent Document 2).
The technology disclosed in Patent Document 2 is a technique in which a weak seal portion is formed in a predetermined pattern on a back seal portion that is affixed to a palm. The weak seal portion is provided so that the back seal portion can be easily fully opened by hand. can do.

However, in this disclosed technique, the back seal portion can be easily peeled and opened due to the presence of the weak seal portion, but the seal portion formed along the upper and lower edges of the bag is provided with the weak seal portion. Therefore, it cannot be easily peeled and opened. Therefore, when trying to open the bag largely, a strong force is required to peel off the seal portions at the upper and lower end edges, and the bag cannot be easily opened.
In addition, although a weak seal part can also be provided in order to make peeling of the seal part of an upper-lower-end edge easy, there exists a possibility that a spill may generate | occur | produce from this part.

Japanese Patent Laid-Open No. 5-513013 Japanese Patent Laid-Open No. 10-95472

  The present invention has been made to solve the above-described problems of the prior art, and in a food packaging bag for cooking by heating in a state of containing food, it is easy to open after cooking is completed. It is excellent, and there is no risk of contaminating the surroundings or burns to the hand when opened, and it can be used as a food tray after opening, and it can be used to transfer food from a bag to tableware. A food packaging bag for cooking that can be omitted is provided.

  The invention according to claim 1 is formed of a rectangular sheet formed by laminating a base material layer, an intermediate layer, and a sealant layer, and is formed by a back seal portion in which the sealant layer is used as an inner surface, and a back seal portion that is applied by a hand. An end seal portion that seals the open end of the cylindrical body, and the back seal portion is thermally bonded with a lower sealing strength than the end seal portion, and the intermediate layer is uniaxial. The present invention relates to a food packaging bag for heat cooking, characterized in that it is made of a stretched film, and the stretching direction is orthogonal to the length direction of the back seal portion.

  The invention according to claim 2 is characterized in that a cut in the direction perpendicular to the length direction of the back seal portion is formed at least near the upper and lower ends of the back seal portion. It relates to food packaging bags.

  According to a third aspect of the present invention, a cut in a direction perpendicular to the length direction of the back seal portion is formed at least near the upper end portion of the back seal portion, and further, near the left and right end portions of the bag back surface, The food packaging bag for cooking according to claim 1, wherein a half cut line extending in parallel with the back seal portion is formed.

  The invention according to claim 4 is characterized in that a half-cut line extending in a direction perpendicular to the length direction of the back seal portion and across the back seal portion is formed at least in the vicinity of both upper and lower end portions of the back surface of the bag. The food packaging bag for cooking according to claim 1.

  According to the first aspect of the present invention, the back seal portion is thermally bonded with lower sealing strength than the end seal portion, the intermediate layer is made of a uniaxially stretched film, and the extending direction is the length of the back seal portion. By being orthogonal to the direction, when taking out the food after being cooked in the packaging bag, the back seal portion can be easily peeled and opened with the back seal portion facing up, The bag can be torn linearly from the seal portion in the left-right direction. For this reason, there is no risk of food spills or juice in the bag spilling at the time of opening, contaminating the surroundings, or sticking to the hands of the opening person and causing burns. And since the bag after opening can be used as a saucer of a foodstuff, the operation | work which transfers a foodstuff from a bag to tableware can be abbreviate | omitted.

  According to the second aspect of the present invention, since a cut perpendicular to the length direction of the back seal portion is formed at least in the vicinity of both upper and lower ends of the back seal portion, the back seal is triggered by this cut portion. The bag can be easily torn from side to side in the left-right direction.

  According to the third aspect of the present invention, cuts in the direction perpendicular to the length direction of the back seal portion are formed at least near the upper end portion of the back seal portion, and the back seal is formed near the left and right end portions of the back surface of the bag. By forming the half cut line extending in parallel with the portion, the bag can be easily torn in the vertical direction along the half cut line after the bag is torn from the back seal portion in the left-right direction.

  According to the invention which concerns on Claim 4, the half cut line extended in the direction orthogonal to the length direction of a back seal part and across this back seal part is formed in the vicinity of the upper and lower ends at least on the back surface of the bag. The bag can be easily torn in the left-right direction along the half-cut line from the back seal portion.

Hereinafter, a preferred embodiment of a food packaging bag for cooking according to the present invention will be described with reference to the drawings.
FIG. 1 is a rear view showing a first embodiment of a food packaging bag for cooking according to the present invention, and FIG. 2 is a schematic cross-sectional view taken along line AA of FIG. FIG. 2 illustrates a state where the back seal portion is raised.
The food packaging bag for cooking according to the present invention is formed from a rectangular sheet in which a base material layer (1), an intermediate layer (5), and a sealant layer (2) are laminated, and the sealant layer (2 ) As an inner surface and a back seal portion (3) bonded by thermal bonding and an end seal portion (4) in which the opening end portion of the cylindrical body formed by palm bonding is sealed by thermal bonding. . In addition, although an edge part seal | sticker part (4) is shown only in the lower end part in the figure, after accommodating a foodstuff inside a bag, it is formed also in an upper end part.

The back seal portion (3) is thermally bonded over the entire length with a lower sealing strength than the end seal portion (4). In order to make the sealing strength of the back seal portion (3) lower than that of the end seal portion (4), a method of reducing the amount of heat applied in the heat bonding step may be used.
As described above, the back seal portion (3) is thermally bonded with lower sealing strength than the end seal portion (4), so that it can be easily peeled off compared to the end seal portion (4). It has become. Therefore, when the food is heated together with the bag using a microwave oven, if the pressure of the steam generated in the bag exceeds a certain level, the back seal portion (3) peels off and the steam is released, preventing the bag from bursting. Can be removed.

As the material for the base material layer (1), rayon, PET, nylon, OP, or the like can be used.
As the sealant layer (2), an easy peel film excellent in easy peelability and microwave oven suitability is used. For example, a polypropylene type easy peel film or a polyethylene type easy peel film can be used.
The intermediate layer (5) is made of a uniaxially stretched film, and as a specific material, uniaxially stretched polyethylene, uniaxially stretched polypropylene, or the like can be used.

The stretching direction of the uniaxially stretched film constituting the sheet intermediate layer (5) is a direction (left and right direction of the bag) orthogonal to the length direction of the back seal portion (3).
Thus, when the extending | stretching direction of a uniaxially stretched film is orthogonal to the length direction of a back seal | sticker part (3), when taking out the food after cooking in a packaging bag, a back seal | sticker part (3 ) Can be easily torn in a straight line from side to side.

The back seal portion (3) is formed with a cut (6) in a direction perpendicular to the length direction of the back seal portion.
The cut (6) extends from one end in the width direction of the back seal portion (3) (the end on the side away from the back of the bag) to the other end (on the back of the bag) so as to penetrate all layers of the sheet by scutting. It is formed toward the end on the near side. The cut (6) is formed up to a middle portion in the width direction of the back seal portion (3), but the length is not particularly limited. For example, the cut (6) is 1/2 with respect to the entire width of the back seal portion (3). It can be formed with a length of about 4 to 3/4.

One cut (6) is provided at least in the vicinity of the upper and lower ends of the back seal portion (3). However, the number of cuts (6) is not particularly limited, and one or more cuts (6) may be provided at a position between the upper and lower ends.
Since the cuts (6) are formed in the vicinity of the upper and lower ends of the back seal part (3), the bag is torn to the left and right with the cuts (6) as a trigger in the vicinity of the upper and lower ends of the packaging bag. Is possible. Therefore, as shown in FIG. 3, the bag can be opened to the left and right, and the opened bag can be used as a food tray as it is for a meal.

FIG. 4 is a rear view showing a second embodiment of the food packaging bag for cooking according to the present invention.
The food packaging bag for cooking according to the second embodiment is provided with the configuration of the bag of the first embodiment described above as a basic configuration, and is further provided with a back seal portion (3) in the vicinity of the left and right ends on the back of the bag. A half cut line (7) extending in parallel is formed.

The half-cut line (7) is a line formed by cutting only a part of the sheet in the thickness direction. In the second embodiment, only the base material layer (1) of the sheet is penetrated by laser processing. It is formed in the longitudinal direction of the bag so as to penetrate only the base material layer (1) and the intermediate layer (5).
In addition, although it is preferable to form this half cut line (7) over the full length of the bag longitudinal direction, you may leave a non-half cut part slightly in an upper-lower end. However, the half-cut portion is formed at least in a portion between the cuts (6) formed in the vicinity of both upper and lower ends.
The half cut line (7) is preferably formed in a straight line shape as shown in the figure, but may be formed in another shape such as a wavy line shape.

  In the second embodiment, a cut (6) perpendicular to the length direction of the back seal portion is formed at least near the upper end of the back seal portion (3). That is, in the second embodiment, the cut (6) may or may not be formed near the lower end.

In the bag of the second embodiment, cuts (6) perpendicular to the length direction of the back seal part are formed in the vicinity of at least the upper end part of the back seal part (3). The half cut line (7) extending in parallel with the back seal portion (3) is formed in the vicinity of the portion, so that the bag is torn right and left in the vicinity of the upper end portion of the packaging bag as a trigger (6). Later, it can be torn longitudinally along the half-cut line (7).
Therefore, as shown in FIG. 5, the bag is greatly opened downward, and the opened bag can be used as it is as a food tray for meals.

FIG. 6 is a rear view showing a third embodiment of the food packaging bag for cooking according to the present invention.
The food packaging bag for heat cooking according to the third embodiment is the back seal in the direction perpendicular to the length direction of the back seal portion (3) instead of the cut (6) in the bag of the first embodiment described above. A half cut line (8) extending across the part is formed.

The half-cut line (8) is a line formed by cutting only a part in the thickness direction of the sheet. In the third embodiment, the half-cut line (8) is a base of the sheet by laser processing. It is formed toward the lateral direction of the bag so as to penetrate only the material layer (1) or only penetrate the base material layer (1) and the intermediate layer (5).
The half cut line (8) may be formed over the entire lateral length of the bag (full width of the bag). You may leave the non-half cut part of about 1/4-1/5.

One half cut line (8) is provided at least near each of the upper and lower ends on the back of the bag. However, the number of the half cut lines (8) is not particularly limited, and one or more half cut lines (8) may be further provided at positions between the upper and lower end portions as shown in FIG.
The half cut line (8) is formed in the vicinity of the upper and lower ends on the back of the bag, so that the bag is torn to the left and right along the half cut line (8) near the upper end and the lower end of the packaging bag. Is possible. Therefore, as shown in FIG. 3, the bag is largely opened to the left and right, and the opened bag can be used as it is as a food tray for meals.

Hereinafter, the operation of the food packaging bag for cooking according to the present invention will be described.
When using the food packaging bag for cooking according to the present invention, first, it is cooked or semi-cooked in a bag in which an end seal portion (4) is provided only at the lower end as shown in FIG. After the food (hamburger or the like) is stored, the upper end is thermally bonded to produce a bag in which the food is sealed.
When a user who purchases a bag containing food manufactured in this way puts the bag into a microwave oven and heats it, the internal pressure of the bag rises due to the steam generated from the food, and the bag expands.
When the pressure in the bag becomes a certain value or more, the seal of the back seal portion (3) is peeled off and a part thereof is opened, and steam is released to the outside from the opening portion. Thereby, the bag is prevented from being ruptured, and the heating is subsequently performed, whereby the cooking of the food is completed.

When cooking is complete, remove the bag from the microwave and open it.
In any bag of the first to third embodiments, the intermediate layer (5) is made of a uniaxially stretched film, and the extending direction thereof is orthogonal to the length direction of the back seal portion (3). When taking out the food after being cooked in the bag, the bag can be easily opened by tearing the bag linearly in the left-right direction from the back seal portion (3).

And in the bag of 1st embodiment, as shown in FIG. 3, a bag is open | released largely right and left by tearing a bag right and left in the vicinity of the upper end part and lower end part of a packaging bag as a trigger. can do.
Further, in the bag of the second embodiment, in the vicinity of the upper end portion of the packaging bag, after tearing the bag left and right using the cut (6) as a trigger, the bag is torn in the vertical direction along the half cut line (7). As shown in FIG. 5, the bag can be greatly opened downward.
In the bag of the third embodiment, the bag is largely opened to the left and right as shown in FIG. 3 by tearing the bag left and right along the half cut line (8) in the vicinity of the upper end and the lower end of the packaging bag. can do.
In the bags of the first and third embodiments, the operation of tearing the bag left and right is performed after the back seal portion (3), which has a lower sealing strength than the end seal portion (4), is peeled off. be able to.

As described above, any of the bags of the first to third embodiments can be easily opened by hand, and there is no risk of contaminating the surroundings at the time of opening or causing burns to the opener's hand. .
Moreover, the opened bag can be used as a food tray, and the work of transferring food from the bag to tableware can be omitted.

  INDUSTRIAL APPLICABILITY The present invention is used as a food packaging bag for cooking by storing food such as a hamburger inside and putting it in a microwave oven as it is for cooking.

It is a rear view which shows 1st embodiment of the food packaging bag for heat cooking which concerns on this invention. It is an AA line schematic sectional drawing of FIG. It is a figure which shows the state which opened the bag of 1st and 3rd embodiment. It is a rear view which shows 2nd embodiment of the food packaging bag for heat cooking which concerns on this invention. It is a figure which shows the state which opened the bag of 2nd embodiment. It is a rear view which shows 3rd embodiment of the food packaging bag for heat cooking which concerns on this invention. It is a rear view which shows the example of a change of 3rd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material layer 2 Sealant layer 3 Back seal part 4 End seal part 5 Intermediate layer 6 Cut 7 Half cut line (longitudinal direction)
8 Half-cut line (horizontal direction)

Claims (4)

It consists of a rectangular sheet in which a base material layer, an intermediate layer, and a sealant layer are laminated,
A back seal part with the sealant layer as an inner surface, and an end seal part that seals the opening end of the cylindrical body formed by the palm-attachment,
The back seal part is thermally bonded with a lower seal strength than the end seal part,
The food packaging bag for heat cooking, wherein the intermediate layer is made of a uniaxially stretched film, and the extending direction thereof is orthogonal to the length direction of the back seal portion.   The food packaging bag for heat cooking according to claim 1, wherein a cut in a direction perpendicular to the length direction of the back seal portion is formed at least near both upper and lower end portions of the back seal portion. A notch in the direction perpendicular to the length direction of the back seal portion is formed at least near the upper end of the back seal portion,
The food packaging bag for cooking according to claim 1, wherein a half cut line extending in parallel with the back seal portion is formed in the vicinity of both left and right end portions on the back surface of the bag.   2. The heating according to claim 1, wherein a half cut line extending in a direction perpendicular to the length direction of the back seal portion and extending across the back seal portion is formed at least in the vicinity of both upper and lower end portions of the back surface of the bag. Food packaging bag for cooking.

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