JP2002249177A - Packaging bag for microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag for a microwave oven which can carry out a retort sterilizing treatment. SOLUTION: In a packaging bag with a bag seal part which packages food and is heated by a microwave oven, a packaging bag 10 comprises a lamination film 11 in which a base material layer 12 and a sealant layer 13 are laminated, and a seal part 22 for opening which can be peeled and opened by an internal pressure of the packaging bag formed in a part of an area in a back seal part 21 with a narrow seal width is provided. In the back seal part, an easily peeled insertion tape 30 in which a cohesive breaking type CPP film layer 31a is formed on one side face is projected inner side of the packaging body from the back seal part of the packaging bag 10 and inserted the whole area.

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 storing foods to be heated and eaten.
The present invention relates to a packaging bag for storing food and the like to be heated by a microwave while being packaged, and to a packaging bag for a microwave oven capable of performing high-temperature and high-pressure sterilization such as retort sterilization.

[0002]

2. Description of the Related Art The inventors of the present invention have invented a packaging bag which can be heated in a microwave oven by freezing and chilled distribution.
No. 57 has been disclosed. As shown in FIG. 5, 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 using a soft packaging film 101, and a part of the back seal portion 102. An opening seal portion 102a that can be peeled open by the internal pressure of the packaging bag formed with a narrow seal width in the region is provided, and a cut portion or cutout portion 102c is cut in the region of the seal portion to form the opening seal portion 102a. It is a provided food packaging bag for a microwave oven.

According to the present invention, an opening seal portion 102a which can be peeled and opened by the internal pressure of a packaging bag formed with a narrow seal width is provided in a partial region of a back seal portion 102, and a cut portion or Since it has a configuration in which the cutout portion 102c is cut and the opening seal portion 102a is provided,
When an internal pressure equal to or higher than a predetermined pressure is generated in a sealed bag during microwave cooking, the inner surfaces of the narrow seal portion that are adhesively sealed with a seal width in the narrow seal portion are peeled off from the unsealed portion side for opening. It can be opened from the seal part,
By providing the cutout (or cutout) so as to make the seal width narrower, it is possible to facilitate the peeling opening due to the internal pressure generated in the bag.

[0004] However, in the present invention, the packaging bag developed for the microwave oven does not have heat resistance enough to cope with retort sterilization.
For this reason, it was difficult to distribute the packaging bag at room temperature depending on the stored items.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems relating to food packaging bags for microwave ovens. The purpose is to provide packaging bags.

[0006]

According to a first aspect of the present invention, there is provided a packaging bag having a back seal portion for packaging food and heating the food in a microwave oven, wherein the packaging bag comprises a base material layer and a sealant layer. An opening seal portion formed of a laminated laminated film and formed in a partial area of the back seal portion with a narrow seal width and capable of being peeled open by the internal pressure of the packaging bag is provided. An easy-peeling insertion tape having an unstretched polypropylene film layer of cohesive failure type formed on one surface protrudes inside the packaging bag main body from the back seal portion of the packaging bag and is inserted over the entire area. Microwave packaging bag.

As described above, the packaging bag is formed of a laminated film in which the base material layer and the sealant layer are laminated, and is formed with a small seal width in a part of the back seal portion. The opening seal portion is provided, and the easy-peeling insertion tape having a cohesion failure type unstretched polypropylene film layer formed on one surface of the back seal portion is provided in the packaging bag more than the back seal portion of the packaging bag. Since the protruding portion is inserted into the entire area while protruding into the inside of the main body, even if the repacking process is performed on the packaging bag, the packaging bag does not break and the peeling can be easily performed.

According to a second aspect of the present invention, in the first aspect of the present invention, the back seal portion is such that the sealant layer of the packaging bag and the unstretched polypropylene film layer of the cohesive failure type of the easily peelable insertion tape face each other. A packaging bag for a microwave oven, characterized in that the packaging bag is folded down on the side where it is adhered.

As described above, since the back seal portion falls on the side where the sealant layer of the packaging bag and the unstretched polypropylene film layer of the cohesive failure type of the easily peelable insertion tape are opposed and adhered to each other, Even if the seal strength between the sealant layer of the bag and the unstretched polypropylene film layer of the cohesive failure type of the easily peelable insertion tape is weak, the interface between the both is protected and even if the retort sterilization treatment is performed at 120 ° C. for about 40 minutes, the interface between the both is maintained. The packaging bag will not break.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A packaging bag for a microwave oven according to the present invention will be described below in detail based on one embodiment. In the packaging bag for a microwave oven of the present invention, for example, as shown in FIGS. 1 (a), (b), and FIG. In the packaging bag 10 having an opening seal portion 22 provided in a partial area of the back seal portion 21, the easily peelable insertion tape 30 is provided on the back seal portion more than the back seal portion of the packaging bag. It protrudes inside the bag body and is inserted over the entire area.

The base material layer 12 is made of aluminum foil (A
The material is not particularly limited as long as it is a material having heat resistance other than the metal foil as in l), but a plastic film such as a nylon (Ny) film or a polyethylene terephthalate (PET) film can be preferably used. Is about 12 to 15 μm.

More specifically, as the Ny film, Harden N1100 (manufactured by Toyobo Co., Ltd.), Boneal RX series (manufactured by Kojin Co., Ltd.), Emblem ON series (manufactured by Unitika Ltd.), and the like can be preferably used. The layer 12 may include a deposited layer (not shown) of an inorganic compound such as silicon oxide, aluminum oxide, etc. The base layer may be provided with a printing layer (not shown) as necessary.

When it is necessary to improve the drop strength, piercing strength and gas barrier property, an intermediate layer 14 may be provided between the base material layer 12 and the sealant layer 13 as shown in FIG. In this case, as the intermediate layer 14, a plastic film such as a PET film and a Ny film can be preferably used. The intermediate layer may include a deposited layer of an inorganic compound such as silicon oxide and aluminum oxide.

The sealant layer 13 is required to withstand the retort sterilization treatment and to have a heat-sealing property.
An unstretched polypropylene (CPP) film of about 0 to 60 μm can be suitably used. More specifically, RXC (manufactured by Tosero Corporation), Allomer (manufactured by Showa Denko KK),
Pyrene P1153 (manufactured by Toyobo Co., Ltd.) or the like can be used.

The base material layer 12 and the sealant layer 13 or the base material layer 12 and the intermediate layer 14 and the sealant layer 13 can be laminated by a known laminating method such as a dry lamination method.

The laminated film 11 thus produced
Is formed by heat sealing using a vertical pillow wrapping machine or a horizontal pillow wrapping machine with a jointed palm so that the sealant layer 13 becomes the inner surface.
(A) Packaging bag 10 having back seal 21 as shown in FIG.
It can be.

An opening seal portion 22 formed with a small seal width and capable of being peeled open by the internal pressure of the packaging bag is provided in a partial area of the back seal portion 21. Specifically, when the width of the back seal is about 8 to 10 mm, the width of the opening seal is about 7 to 8 mm, and the length is 5 to 5 mm.
It is preferably about 20 mm. Further, the easy-peeling insertion tape 30 is inserted over the entire area of the back seal portion 21 so as to protrude inside the packaging bag from the back seal portion of the packaging bag. The width of the easy-peeling insertion tape protruding inside the packaging bag is 5
mm is preferable.

The opening seal portion 22 is not limited to one at the back seal portion, and may be provided at a plurality of positions. Specifically, when the width of the back seal portion is about 8 to 10 mm,
A large number of seal portions for opening can be provided, for example, at intervals of about 20 mm. This makes it possible to easily change the size of the packaging bag in 20 mm increments without replacing the heat seal bar of the back seal portion (see FIG. 4).

Providing an opening seal portion in a partial area of the back seal portion and inserting an easy-peeling insertion tape into the back seal portion can be achieved by using a part of the vertical pillow packaging machine or the horizontal pillow packaging machine described above. It can be easily implemented by remodeling.

The easy-peeling insertion tape 30 has one surface 31a.
A cohesion failure type unstretched polypropylene (CPP) film layer having a thickness of about 20 to 30 μm is formed on the other side 31b, and a layer made of the same material as the innermost surface of the packaging bag (having a thickness of 20 to 30 μm) Degree) is formed.

Specifically, when the innermost surface of the packaging bag is a CPP film, a cohesive failure type CPP (9501A (manufactured by Toray Synthetic Film Co., Ltd.), 013C (manufactured by Tocelo Co., Ltd.), E3310T (manufactured by Dainippon Ink and Chemicals, Inc.) E3800T (manufactured by Dainippon Ink and Chemicals, Inc.)
Etc.) A two-layer tape composed of a laminated film of 31a / CPP (3931 (manufactured by Toray Synthetic Film Co., Ltd.)) 31b can be preferably used. This easily peelable insertion tape 3
A laminated film composed of two layers constituting layer 0 can also be laminated by a known laminating method such as a dry lamination method.

Further, at the time of preparing the packaging bag, as shown in FIG. 1 (b) and FIG. 2, the back seal portion 21 is made of the innermost sealant layer 13 of the packaging bag and the cohesive failure type CP of the easily peelable insertion tape.
Even if the sealing strength between the sealant layer and the cohesive failure type CPP film layer of the easily peelable insertion tape is weak, the packaging bag can be folded down by falling down on the side where the P film layer 31a is opposed and adhered. Even if the retort sterilization treatment is performed at 120 ° C. for about 40 minutes, the packaging bag does not break at that point.

The sealing strength of the top seal portion (or bottom seal portion) 23 of the completed packaging bag is not less than 19.6 N / cm width, and the sealant layer of the back seal portion 21 and the sealant layer of the packaging bag of the easily peelable insertion tape are used. The seal strength of the layer made of the same material is 19.6 N / cm width or more, and the cohesive failure type CP of the sealant layer of the back seal part and the easily peelable insertion tape
The sealing strength of the P film layer is 1.5 to 19.0 N / cm.
The width is appropriate.

[0024]

The present invention will be described in more detail with reference to the following examples. << Experiment 1 >><Example1> First, 15 μm thick N was used as the base material layer 12.
y film (Harden N1100, manufactured by Toyobo Co., Ltd.) as a sealant layer 13 with a thickness of 50 μm CPP
Films (RXC, manufactured by Tosero Corporation) were prepared.

Then, the base material layer 12 and the sealant layer are bonded by a dry lamination method, and Ny (15 μm) /
A two-layer film for a packaging bag main body having a CPP (50 μm) configuration was prepared, and finally slit into a desired width to obtain a packaging bag main body roll.

Separately, a cohesive failure type CPP film having a thickness of 30 .mu.
m CPP film (9501C, manufactured by Toray Synthetic Film Co., Ltd.) as a CPP film having a thickness of 30 μm
P3931 (manufactured by Toray Synthetic Film Co., Ltd.) was prepared.

The two films were laminated by a dry lamination method to prepare a two-layer film for an easily peelable insertion tape having a CPP (30 μm) / cohesion failure type CPP (30 μm) structure, and finally slit to a width of 15 mm. To form a roll for an easily peelable insertion tape.

A Ny / CPP two-layer film slit to a desired width is 140 m wide using a pillow-type wrapping machine of a self-adhesive type with the CPP film side facing the inside.
The packaging bag of Example 1 having a m, a length of 200 mm, and a back seal portion having a width of 10 mm was produced.

The width of the back seal portion is approximately 8 m at substantially the center.
The opening seal portion 22 having a length of 20 mm and a length of 20 mm is provided, and the back seal portion has a CPP (30 μm) having a width of 15 mm.
m) / A two-layer easily peelable insertion tape composed of CPP (30 μm) of cohesive failure type is inserted in a state protruding 5 mm from the back seal portion into the inside of the packaging bag. Further, the back seal portion is a CPP (50) which is the sealant layer 13 of the packaging bag.
μm) and cohesive failure type CPP layer 3 of easily peelable insertion tape
1a is folded to the side where it is opposed and adhered (see FIG. 1 (b)).

<Example 2> Instead of a 15 μm-thick Ny film, a 12 μm-thick P
ET film was used (that is, the layer structure of the packaging bag was P
Except for ET (12 μm) / CPP (50 μm) two-layer film), the same material and method as in Example 1 were used to produce a packaging bag of the same dimensions as in Example 1 to obtain a packaging bag of Example 2. .

Example 3 In the configuration of the packaging bag of Example 2, the two-layer film PET (12 μm) composed of PET (12 μm) / CPP (50 μm) and CPP (50 μm) were used.
m), an unstretched nylon film having a thickness of 15 μm was used as the intermediate layer 14 (that is, the layer configuration of the packaging bag was P
ET (12 μm) / unstretched nylon film (15 μm
m) / CPP (50 μm) except for the three-layer film), a packaging bag having the same dimensions as in Example 1 was produced using the same material and method as in Example 2 to obtain a packaging bag of Example 3.

Experiment 2 Example 4 Using the roll for the packaging bag body and the roll for the easy-peeling insertion tape used in Example 1, in the same manner as in Example 1,
A packaging bag of Example 4 having a width of 140 mm, a length of 200 mm, and a plurality of opening seal portions on a back seal portion having a width of 7 mm was produced.

That is, as shown in FIG. 4, for the back seal portion, one seal width (e) is 3 mm, the entrance width (f) of the opening is 3 mm, and the exit width (g) is 10 mm. A plurality of seal portions (22) are provided at intervals of 20 mm.

In the back seal portion, as in Experiment 1,
An easy-peeling tape is inserted in a state protruding about 5 mm into the inside of the packaging bag, and the back seal portion is adhered so that the CPP (50 μm), which is a sealant layer of the packaging bag, and the cohesive failure type CPP layer of the easy-peeling insertion tape face each other. The bag is made by falling down from the position (d) where it is about 3 mm into the packaging bag on the side where the bag is placed.

<Example 5> As in Example 1, a roll having a width of 140 mm, a length of 200 mm and a width of 7 mm was used in the same manner as in Example 1 using the roll for the packaging bag main body and the roll for the easily peelable insertion tape used in Example 2.
A packaging bag of Example 5 having a plurality of opening seal portions similar to that of Example 4 on the back seal portion of mm was produced.

<Example 6> A roll having a width of 140 mm, a length of 200 mm and a width of 7 mm was used in the same manner as in Example 1 by using the roll for the packaging bag main body and the roll for the easily peelable insertion tape used in Example 3.
A packaging bag of Example 6 having a plurality of opening seal portions similar to Example 4 on the back seal portion of mm was produced.

The sealing strength, retort resistance, and microwave resistance of the six types of packaging bags produced in Experiments 1 and 2 were measured and observed under the following conditions. The results are shown in Tables 1 and 2. Seal strength ‥ (1) Top seal part, (2) Sealant layer (CPP; 50 μm thickness) of packaging bag of back seal part and CPP layer (30 μm thickness) of easily peelable insertion tape, (3) Packaging bag of back seal part Sealant layer (CPP; 50 μm thick) and cohesive failure type CPP layer (30 μm)
m), and the seal strength at the above three points was measured at 300 mm / min. Measure the seal strength when pulling both ends at the speed of (180 ° peel, the unit of measurement is N / cm).
After filling 0 g, the retort treatment is performed with the back seal part facing upward at 120 ° C. for 40 minutes, and the packaging bag is observed for a broken state. ○: No damage from the sealing part of the packaging bag ×: Occurrence of damage from the sealing part of the packaging bag
Then, put it in a household microwave oven (output: 500 watts), heat it for 150 seconds, and observe the broken state of the packaging bag. ○: Vapor is smoothly released from the opening seal portion of the back seal portion of the packaging bag, and the packaging bag does not break. ×: Vapor is not smoothly released from the opening seal portion of the back seal portion of the packaging bag, and the packaging bag may be broken.

[0038]

[Table 1]

[0039]

[Table 2]

As can be seen from Tables 1 and 2, the packaging bags of Examples 1 to 6 have suitability for retort treatment in addition to suitability for microwave treatment.

[0041]

As described above, in the packaging bag for a microwave oven according to the present invention, when an internal pressure exceeding a predetermined pressure is generated by heating the microwave oven, the internal pressure escapes from the opening seal portion at the center of the back seal portion. If the content is an appropriate amount, the content such as liquid does not escape from the packaging bag other than the opening seal portion at the center of the back seal portion when the microwave oven is heated.

Even if the contents are filled, the back seal portion having a weak seal strength always falls down on the bag surface, and the back seal portion does not rise when pressure is applied from outside the packaging bag due to general transportation or the like. The back seal is broken and the contents do not go outside. There is no need to suppress the contents,
There is no need to worry about deformation of the packaging bag due to holding down by degassing or vacuum packaging. Retort treatment becomes possible, and the contents in the bag can be distributed at room temperature. By using the back seal bar having a shape in which the opening seal portions are continuously provided at regular intervals, the size of the product can be easily changed, and the productivity can be improved.

[Brief description of the drawings]

1A and 1B show an embodiment of a packaging bag for a microwave oven according to the present invention, wherein FIG. 1A is an explanatory plan view, and FIG.
It is A 'line sectional explanatory drawing.

FIG. 2 is an enlarged sectional explanatory view of a main part of FIG. 1 (b).

FIG. 3 is a cross-sectional explanatory view showing another embodiment of the layer configuration of the packaging bag body of the packaging bag for a microwave oven of the present invention.

4A and 4B show another embodiment of the packaging bag for a microwave oven of the present invention, wherein FIG. 4A is an explanatory plan view and FIG. 4B is an enlarged explanatory view of a portion A of FIG.

FIG. 5 is an explanatory plan view showing a conventional packaging bag for a microwave oven.

[Explanation of symbols]

 Reference Signs List 10 packaging bag 11 laminated film 12 base material layer 13 sealant layer 14 intermediate layer 21 back seal part 22 opening seal part 23 top (ground) seal part 30 {Easy-peeling insertion tape 31a} One surface, cohesive failure type CPP film 31b {Other surface, CPP film 40} Contents 101 {Soft packaging film 102} Back seal 102a {Opening seal 102c ‥ Notch or notch d ‥‥ Fold back line of back seal

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E064 AA08 BA30 BB03 BC01 BC18 EA18 EA30 FA01 FA03 HN05 HP03 3E067 AB01 BA11A BB14A BB16A BB25A CA04 CA24 EA11 EA15 EB21 EE48 FB13 GC02 GD08

Claims (2)

[Claims] 1. A packaging bag having a back seal for packaging food and heating the food in a microwave oven, wherein the packaging bag comprises a laminated film in which a base material layer and a sealant layer are laminated, and a part of the back seal. The area is provided with an opening seal portion that can be peeled open by the internal pressure of the packaging bag formed with a narrow seal width, and the back seal portion has an unstretched polypropylene film layer of a cohesive failure type on one surface. A packaging bag for a microwave oven, wherein the formed easy-peeling insertion tape protrudes inside the packaging bag main body from the back seal portion of the packaging bag and is inserted over the entire area. 2. The method according to claim 1, wherein the back seal portion is laid down on a side where the sealant layer of the packaging bag and the cohesive failure type unstretched polypropylene film layer of the easily peelable insertion tape are opposed and adhered. The packaging bag for a microwave oven according to claim 1.