JP2001301845A - Food packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a food packaging bag of a deep drawn shape exhausting quietly vapor from a sealing section of the packaging bag to the outside of the bag without breaking the bag when being heated by a microwave oven. SOLUTION: The packaging bag of the deep drawn shape is used for packaging the food and formed of a main body film 1 heating the food in the microwave oven and a cover material film 2, and a vapor plenum 12 processed to be easily unsealed is formed on a central section of at least one sealing section 11 constituting the packaging bag 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for sealing a food product together with a seasoning in a packaging bag made of a synthetic resin film, without transferring the contents from the packaging bag as it is, and for allowing the consumer to store the content in the packaging bag. The present invention relates to a deep-drawn food packaging bag that can be heated and cooked in a microwave oven without any modification.

[0002]

2. Description of the Related Art Several methods have been considered for a deep drawing packaging bag in which saturated steam in the bag is used to release steam from the periphery of the sealed portion to the outside of the packaging bag. For example, by setting a material configuration that gives an easy-open function to the laminated film constituting the packaging bag, and setting the seal strength to a width of 2.94 to 7.84 N / 15 mm,
The sealing part is easily broken by the saturated water vapor pressure in the packaging bag,
Water vapor is released outside the packaging bag to prevent the packaging bag from bursting. In addition, before performing microwave heating, a small hole in the shape of a needle is formed in the packaging bag, a part of the lid material is peeled off, and a steam outlet is provided in advance.

[0003] However, these packaging bags have the following problems. That is, in the former method, the steam outlet is not specified, and there is a possibility that steam may be blown out from a place that the cook cannot predict, and there is a problem in terms of safety. Further, the latter method has a problem that a steam outlet must be provided in advance.

[0004] When the contents contain liquid,
The liquid boils in the packaging bag due to the microwave treatment, and if the broken seal portion is set in the horizontal direction (horizontal direction), there is a possibility that the heated liquid may blow out in the horizontal direction.

[0005]

SUMMARY OF THE INVENTION The present invention focuses on the above-mentioned problems relating to food packaging bags which can be cooked in a microwave oven without the consumer having to take any action on the packaging bags. It is made and, in addition to pre-determining the outlet of the steam generated when heating the microwave,
An object of the present invention is to provide a deeply drawn food packaging bag capable of gently discharging the bag from the sealing portion of the packaging bag to the outside without breaking the bag.

[0006]

Means for Solving the Problems A first invention of the present invention is:
In a deep-drawing-shaped packaging bag composed of a main body film and a lid material film for packaging the food and heating it in a microwave oven, a steam outlet is provided near the center of at least one of the seals constituting the packaging bag. It is a food packaging bag characterized by being made.

As described above, since the steam outlet is provided near the center of at least one of the seal portions constituting the packaging bag, the steam generated when the microwave oven is heated breaks the bag from the steam outlet. Released without doing.

It is preferable that the steam outlet is provided in a seal in the longitudinal direction of the packaging bag, since the steam is gently discharged. Further, the steam outlet is not limited to one location, but may be provided at two locations facing each other in the longitudinal direction.

According to a second aspect of the present invention, there is provided the food packaging bag according to the first aspect, wherein the steam outlet is a narrow seal portion having a narrow seal width.

[0010] In a third aspect based on the first aspect, the steam outlet is provided with a slit penetrating a seal portion having a length of 3 to 5 mm in a longitudinal direction of the seal portion.
A food packaging bag characterized by slit processing in which a plurality or a plurality of slits are provided.

As described above, one or a plurality of slits penetrating the seal portion having a length of 3 to 5 mm in the longitudinal direction of the seal portion are provided near the central portion of at least one of the seal portions constituting the packaging bag. Since it is provided, steam generated when the microwave is heated is released from the slit having a relatively weaker sealing strength than the surroundings without breaking the bag.
The length of the slit is preferably 3 to 5 mm.
It can be used even if it is enlarged up to 10 mm. In general, the length of the connecting portion between the slits is about 2 to 3 mm.

According to a fourth aspect of the present invention, in the first, second or third aspect, the seal portion provided with at least the steam outlet is a seal portion having an outwardly upward inclination. It is a food packaging bag characterized by the above.

[0013] As described above, since the seal portion having the steam outlet is a seal portion having a slope facing outward, when the microwave oven is heated, a food containing a large amount of liquid is filled. However, the vapor of the contents does not blow out from the steam outlet in the lateral direction.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments. The food packaging bag of the present invention is, for example, shown in FIG.
As shown in (b), the main body film 1 and the lid film 2
And has a structure in which a steam outlet 12 is provided in the vicinity of the center of at least one of the seal portions 11 constituting the packaging bag.

The main body film 1 is not particularly limited as long as it is a material other than a metal foil such as aluminum foil (Al), but a nylon film (N
y) / Unstretched polypropylene film (CPP), Ny
/ Ny / CPP, Ny / ethylene / vinyl alcohol copolymer film (EVOH) and the like can be preferably used.

As the cover material film 2, a coextruded film based on a cohesion failure type polypropylene film, and more specifically, a toughened polyethylene terephthalate film (OPET) or a stretched nylon film (ONy) is used. TAF650C (trade name, manufactured by Tocelo Co., Ltd.) and Trefan CF9501A
(Trade name, manufactured by Toray Synthetic Film Co., Ltd.) or the like as a sealant layer can be preferably used.

As a steam outlet, for example, FIG.
Structures shown in (a) and (b) are mentioned.

In FIG. 2A, reference numeral 14 denotes a narrow seal portion, which has a seal width which is about half as narrow as that of the normal seal portion 11. More specifically, for example, in the case of a deep drawing packaging bag having a size of 200 mm in length, 150 mm in width, and a seal width of 9 to 10 mm, the outer side of the central portion of one of the seal portions 11 in the longitudinal direction, Upper bottom 5-10m
A trapezoidal notch 15 having a length of 5 m, a lower base of 10 to 20 mm, and a height of 5 to 6 mm is provided to form an easy opening 12.

The cutout 15 may be replaced with a semicircular unsealed portion 18 instead of the cutout (FIG. 2).
(B)).

When the main body film 1 is formed by deep drawing, the flange portion at the side edge of the molding container serving as a seal portion is inclined outward and upward as shown in FIG. 1 (b). It is preferable that the molding is carried out. The inclination angle may be, for example, about 45 °, but is not limited to 45 °. By doing so, when the microwave oven is heated, even if the food containing a large amount of liquid is filled, the vapor of the content does not blow out from the steam outlet in the lateral direction.

In FIG. 3 (a), reference numeral 21 denotes a slit, which acts in place of the above-mentioned notch. Specifically, when a packaging bag having the same dimensions as the embodiment of FIG. 2 (a) is considered. It is good to provide in the center part of the outer edge of the steam outlet provided over 80-100 mm in length with a length of 1-10 mm, preferably 3-5 mm.

The number of slits is not limited to one. For example, a plurality of slits may be provided continuously with a connecting portion having a length of about 2 to 3 mm (see FIG. 3B).

The slit is formed at a location on the lid material film which becomes a flange portion when formed into a deep drawing packaging bag.
Alternatively, it can be substituted by providing it endlessly in advance (see FIG. 4). In this case, the number of rows is not limited to two as shown in FIG. 4, and may be one or three or more. When slitting is continuously performed on the lid material film, there is an advantage in that it does not require modification of a deep drawing vacuum forming machine and can cope with all dimensions. However, the slit processing needs to be provided in the longitudinal direction, and needs to be provided along the flow direction of the deep drawing vacuum forming machine.

[0024]

EXAMPLES Examples will be further described in detail. Example 1 First, a laminated film (thickness: 200 μm) made of unstretched nylon (CNy) / PP (co-extruded) was used as a main film, and Ny / special CPP (PP-based co-extruded film) was used as a cover film. (Thickness: 75 μm) was prepared.

The main body film and the lid material film are set in a deep drawing vacuum packaging machine (MULTIBACK R-230, Nakamura Sangyo Co., Ltd.), and the length is 200 mm, the width is 150 mm, the drawing depth is 15 mm, and the seal width is 10 mm. The deep drawn packaging bag of Example 1 was produced. At this time, as an easy opening process, a length of 15 mm and a depth of 6 mm as shown in FIG.
A semi-circular unsealed portion of mm was provided. In addition, a waste containing about 5 to 10 ml of tap water was used as the filler.

<Example 2> Tap water was added to the filler in an amount of 5 to 10%.
A deep drawn bag of Example 2 was produced in the same manner as in Example 1, except that 100 grams of processed meat was used instead of the waste containing about milliliters.

<Example 3> The deep drawn packaging bag of Example 3 was prepared in the same manner as in Example 1 except that the steam outlet was replaced by a slit having a length of 5 mm instead of the semicircular unsealed portion. Produced.

The deep drawn packaging bags of the three examples thus prepared were separately placed in a household microwave oven (output: 500 watts) and heated. As a result, in all three types, the steam was smoothly released from the portion where the easy opening process was performed with a heating time of about 90 seconds. In addition, the sealing strength of the sealing portion of the deep drawn packaging bag of the three types of examples, in both the vertical and horizontal directions,
It was stable at 5.2 to 6.9 N / cm.

[0029]

As described above, according to the present invention, the saturated steam pressure in the deep-drawing packaging bag when the microwave oven is heated can be smoothly discharged from an arbitrarily designated portion, and the steam to be blown out can be arbitrarily selected. Since the product can be discharged at an angle, the user can safely cook the microwave even in a product in which the content is mixed with a liquid without any modification by himself / herself.

[Brief description of the drawings]

FIG. 1 shows one embodiment of a food packaging bag of the present invention, (a).
Is a plan explanatory view, and (b) is a schematic explanatory view of the AA ′ section of (a).

FIGS. 2A and 2B are schematic explanatory views showing one embodiment of a steam outlet provided in a seal portion of a food packaging bag according to the present invention.

FIGS. 3 (a) and 3 (b) are schematic illustrations showing another embodiment of the steam outlet provided in the seal portion of the food packaging bag of the present invention.

FIG. 4 is an example in which a food packaging bag is manufactured using a lid film preliminarily processed with a continuous slit at a predetermined position, and an arrow indicates a flow direction of a deep drawing vacuum forming machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1} Body film 2> Lid material film 10> Food packaging bag 11> Seal part provided with steam outlet 12> Steam outlet 14> Narrow seal part 15> Notch 17> It Other seal parts 18 ‥‥ Unsealed part 21 ‥‥ Slit

Claims (4)

[Claims] 1. A deep drawing packaging bag comprising a main body film and a lid material film for packaging food and heating it in a microwave oven, wherein the packaging bag is provided in the vicinity of the center of at least one of the sealing portions constituting the packaging bag. A food packaging bag provided with a steam outlet. 2. The food packaging bag according to claim 1, wherein said steam outlet is a narrow seal portion having a narrow seal width. 3. The method according to claim 1, wherein the steam outlet is formed by slitting one or a plurality of slits penetrating a seal portion having a length of 3 to 5 mm in a longitudinal direction of the seal portion. The food packaging bag according to 1. 4. The food package according to claim 1, wherein the seal portion provided with the steam outlet is a seal portion having an outward upward slope. bag.