JP2003002374A - Retortable package bag for microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retortable package bag for a microwave oven which has an automatic releasing means for inside steam against rapture when heated in a microwave oven. SOLUTION: A fin portion 3 raised by mating and sealing opposing inner surfaces of a laminated plastic film at three-side perimeter S remaining a non- sealing portion N is formed on one surface of a packaging pouch composed of the laminated plastic film, and the automatic releasing means for inside steam is provided at the non-sealing portion N of the fin portion 3. The automatic releasing means is formed by one of forming a point sealing portion with a through-hole at the center, forming an annular sealing portion around a point non-sealing portion with a through-hole at the center, and forming an annular sealing portion around a dotted pattern sealing portion with a through-hole at the center. The point sealing portion or annular sealing portion has a adjusted sealing strength of >=23 N/15 mm at room temperature and <=20 N/15 mm at >=90 deg.C after retort treatment.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD [0001] The present invention not only does not burst when heated or cooked by a microwave oven and allows stable handling without spilling of the contents, but also enables retort treatment of the contents. The present invention relates to a pouch-shaped packaging bag.

[0002]

2. Description of the Related Art Conventionally, in order to prevent rupture due to an increase in internal pressure of a packaging bag that occurs when heating or cooking food in a microwave oven while packaging food, a part of the packaging bag is heated before heating or cooking. Means for cutting through with scissors or for forming a through hole with a sharp tip (Japanese Patent Laid-Open No. 9-
24075), means for providing a layer of a non-woven fabric through which steam escapes in a part of the packaging bag in the manufacturing process of the packaging bag (Japanese Patent Laid-Open No. Hei 9 (1998) -96952)
-240753), means for providing a weak seal portion that is easy to open (JP-A-9-142541), means for providing a notch that is easy to open in the seal portion, or means for partially narrowing the seal width (JP 2000-72189, JP-A-10-147371, JP-A-10-101154) and the like have been put to practical use or proposed.

[0003]

However, it is troublesome to open a through hole in the packaging bag, cut a part of the packaging bag, or cut out the packaging bag before heating or cooking, and forgetting it is a pouch packaging bag. Is dangerous to burst during heating. In addition, when a nonwoven fabric is used, a completely closed system cannot be obtained, and in the case of frozen foods, there is a problem that freeze-drying occurs, and the use of a nonwoven fabric causes a problem that the cost for bag making increases. is there. Furthermore, if a cutout is provided in the seal part around the pouch packaging bag or if the seal width is partially narrowed, in the case of food containing juice, the contents will spill in the range. , It is troublesome to hold the pouch packaging bag in a standing state in a microwave oven. Further, since the retort pouch packaging bag is required to have a sealing strength of 23 N / 15 mm or more, there is a problem that conventional microwave packaging bags cannot be used for retort applications. The present invention has been made in view of the above problems, the present invention,
As a retort pouch, it withstands retort processing, and even if it is heated or cooked in a microwave oven as it is, steam is automatically released and it does not burst, and it is placed horizontally in the microwave oven. It is an object of the present invention to provide a retort-compatible packaging bag for microwave ovens in which juice does not spill even in a state.

[0004]

According to the present invention, there is provided a retort packaging bag for a microwave oven, wherein a pouch-shaped packaging bag made of laminated plastic films is provided on one surface thereof with the inner surfaces of the plastic films facing each other located in the center. The non-sealing portion is left, and the three peripheral portions are sealed together to form a fin portion that rises substantially vertically on the surface, and the non-sealing portion of the fin portion is provided with an automatic opening means for internal steam. The automatic opening means, at least one point-shaped seal portion having at least one through hole consisting of a cutting edge or a notch is formed in the central portion, and at least one of the central sealing portion is formed. Forming an annular seal part around the dot-like non-seal part having a through hole, and around the dot pattern seal part having at least one through hole in the center It can be achieved either by forming the annular seal portion. Further, in the packaging bag for a microwave oven compatible with a retort according to the present invention, the seal strength after the retort treatment in the point seal portion or the annular seal portion is 23 N / 15 mm or more at room temperature and 20 N / 15 mm or less at 90 ° C. or more. That, the reach distance from the center point of one surface of the pouch-shaped packaging bag to the point seal portion or the annular seal portion, the distance from the center portion to the inner edge of the nearest side seal portion for bag making Within the range, the shortest distance between the through hole and the outer edge of the point seal portion and the shortest width of the annular seal portion are 3 to 1.
Within the range of 0 mm, the shorter one of the distances between the fin portion formed on one surface of the pouch-shaped packaging bag and the inner edges of both side seal portions substantially parallel to the fin portion is the longer one. Is less than 1/2 of the distance.

[0005]

The present invention will be described in more detail with reference to the drawings. FIG. 1 is a perspective view of a retort-compatible microwave packaging bag according to the present invention. FIG. 1A is a perspective view before bag making, and FIG. 1B is an explanatory view of a film piece for bag making. As shown in Fig. 1 (a), the retort-compatible microwave packaging bag 10 according to the present invention has side seal portions 2 on three sides before filling the contents, and one side is open but the contents are filled. Sealed to form the side seal portion 2 '. What is characteristic of this pouch packaging bag is that the fin portion 3 that can be raised substantially vertically is formed on one surface 1 of the pouch packaging bag. The fin portion 3 is provided at a position deviated from the center of the surface 1 in the longitudinal direction, and is normally tilted to one side. The fin portion 3 is formed by sealing the peripheral portions S of the three sides in a gas-sealed manner, leaving the non-sealed portion N in the center of the inner surfaces of the opposing film pieces, and the internal steam is contained in the non-sealed portion N. The processing section 4 is provided to realize the automatic opening means. The retort-compatible microwave oven packaging bag 10 according to the present invention as described above can be generally made from three pieces of plastic films including films 1 to 3 as shown in FIG. 1 (b).

FIG. 2 is an explanatory view of the automatic opening means in the packaging bag for a microwave oven compatible with a retort according to the present invention. The non-sealing portion N of the fin portion 3 of the retort-compatible microwave oven packaging bag 10 according to the present invention is provided with any one of first to third means described below.
The first means, as shown in FIG. 2 (a), is to form a point-shaped seal portion 5 having at least one through hole 8 or 8'consisting of a cutting edge or a notch in the central portion. As shown in FIG. 2 (b), the second means forms a point-shaped non-sealing portion 7 having at least one through hole 8 or 8'consisting of a cutting edge or a notch in the central portion thereof, and surrounding the periphery thereof with an annular shape. This is because it is surrounded by the seal portion 6. As shown in FIG. 2 (c), the third means is to form a dot pattern seal portion 9 having at least one through hole 8 or 8'consisting of a cutting edge or a notch in the center thereof, and surrounding the periphery thereof with an annular shape. This is because it is surrounded by the seal portion 6. The number and shape of the through holes 8 and 8'are arbitrary, and the shapes of the point seal portion 5 and the annular seal portion 6 are not limited to the circular shape, the circular shape shown in the figure, and may be an elliptical shape, a rectangular shape, or the like. You can choose to. The seal pattern used for the pattern seal portion 9 is not limited to the polka dots shown in FIG.
It can be freely selected from the shape of a turtle shell. Through hole 8,
8'can be processed by a cutting blade or a punching blade simultaneously with the sealing of the dot seal portion 5 and the annular seal portion 6 at the time of bag making, and it is not necessary to perform another step, which is efficient. The seal strength after the retort treatment in the above point-shaped seal portion 5 or the annular seal portion 6 is 23 N / 1 at room temperature.
It is controlled to be 20 N / 15 mm or less at 5 mm or more and 90 ° C. or more. This is a requirement for a retort-compatible microwave packaging bag, and the sealing strength will be described in more detail later.

FIG. 3 is a state explanatory view at the time when the automatic opening means of the retort-compatible microwave oven packaging bag according to the present invention functions. The vapor pressure generated by the internal heating by the microwave oven acts so as to peel off the point-like seal portion 5 or the annular seal portion 6 from their outer circumferences, and the peeling occurs at the central through holes 8, 8 ′ or the dot-like non-sealing portion. At the moment when the temperature reaches 6, the internal steam is automatically discharged from the through holes 8 and 8 '. FIG. 3 is a cross-sectional view of the packed retort-compatible microwave oven packaging bag 10 according to the present invention that passes through the processing section 4 of the automatic opening means, and shows the retort pouch immediately before heating shown in FIG. Causes the fin portion 3 to rise as it is heated, and the steam is released from the through holes 8 and 8'as shown in FIG. 3 (b). After the heating is completed,
As shown in (c), since it returns to the original state again, it suffices to cut a part of the packaging bag and take out the contents. As can be seen from this figure, according to the retort-compatible microwave oven packaging bag 10 of the present invention, even in the case of foodstuffs containing a large amount of juice, liquid leakage, spillage, and the like are less likely to occur during heating or cooking, The microwave can always be used in a clean state.

FIG. 4 is a dimensional explanatory view of the main part of the packaging bag for a retort-compatible microwave oven according to the present invention. In order to make the above-mentioned first to third automatic opening means in the retort-compatible microwave oven packaging bag 10 according to the present invention function stably and effectively, the point seal part 5 or the annular seal part 6 should be kept inside the seal. It is necessary to concentrate the peeling stress due to vapor pressure. For this purpose, it is preferable to set the dimensions of each part of the packaging bag as follows. That is, as shown in FIG. 4 (a), the reaching distance E from the center point X on the one surface 1 of the pouch-shaped packaging bag to the point seal part 5 or the annular seal part 6 in the processing part 4 of the automatic opening means is , The central part X
Is preferably set to be within the range of the distance F from to the inner edge of the nearest side seal portion 2 for bag making. Further, of the distances A and B between the fin portion 3 formed on the one surface 1 of the pouch-shaped packaging bag and the inner edges of the side seal portions 2 and 2 ′ substantially parallel thereto, the shorter distance is longer. It is preferable that the distance is set to 1/2 or less of the other distance.
By providing such a positional relationship, the peeling stress is most likely to concentrate on the processed portion 4 of the automatic opening means, and the internal steam can be released within a faster heating elapsed time. Further, as shown in FIGS. 2A and 2B, the shortest distance H from the through holes 8 and 8 ′ in the point seal part 5 and the annular seal part 6 to the outer edge of the dot seal part 5 and the annular seal part. Setting the shortest width H of 6 within the range of 3 to 10 mm is also an important requirement for the automatic opening means to function within a predetermined heating time. If the shortest distance H or the shortest width H is larger than 10 mm, it becomes impossible to release the steam from the processing portion 4 of the automatic opening means, and the side seal portions 2 and 2 '(width of about 10 mm) is broken. May occur. If it is smaller than 3 mm, the sealing strength is too weak and the possibility of bag breakage during distribution increases. Furthermore, in order to effectively concentrate the peeling stress of the internal steam on the processed portion 4 of the automatic opening means in the fin portion 3, FIG.
A guide seal portion G having a shape as shown in the explanatory view of the guide seal in the fin portion may be provided instead of the three peripheral portions S shown in the fin portion 3 in FIG.

The laminated plastic film constituting the retort-compatible microwave oven packaging bag 10 according to the present invention has at least an innermost sealant layer and a barrier layer, and further comprises a base layer, an intermediate layer and the like in an appropriate combination. is there. To give an example of the laminated structure, for example, barrier layer / sealant layer, barrier layer / intermediate layer /
A sealant layer, a base material layer / barrier layer / sealant layer and the like. The thickness of this sealant layer is 40 to 100 μm,
It is preferably 60 to 80 μm. The method for laminating each layer is not particularly limited, but for example, an extrusion laminating method, a dry laminating method, or the like can be used. The selection of the sealant layer in this layer constitution is one of the points of the present invention, and is 23 N / at room temperature.
At 15 mm or more and 90 ° C. or more, it is necessary to have a sealing strength of 20 N / 15 mm or less, preferably 15 N / 15 mm or less. It is 23N / 15 at room temperature
If it is less than 10 mm, it cannot be used for retort applications, and if it has a sealing strength of 20 N / 15 mm or more at 90 ° C. or higher, automatic opening of internal steam does not occur and bursting easily occurs. In order to provide a stable automatic opening function, 20 N / 15 mm or less, preferably 1
It is desirable to control to 5 N / 15 mm or less. For the sealant layer, a polyolefin resin such as polypropylene and a copolymer mainly composed of propylene and ethylene or α-olefin, or a polyester resin such as polyethylene terephthalate is suitable because it is necessary to endure the high temperature during retort. Further, a polyolefin resin such as ethylene, an ethylene-α-olefin copolymer, or polypropylene, which is synthesized by using a metallocene catalyst or a late transition metal complex catalyst, is also used. As the barrier layer, aluminum foil that interferes with microwave heating, aluminum vapor deposition film, etc. cannot be used, but silica vapor deposition polyethylene terephthalate film, alumina vapor deposition polyethylene terephthalate film, silica vapor deposition stretched nylon film, alumina vapor deposition stretched nylon film, polyvinyl alcohol A coated stretched polypropylene film, a nylon 6 / meta-xylenediamine nylon 6 co-extruded co-stretched film, a polypropylene / ethylene-vinyl alcohol copolymer co-extruded co-stretched film, or the like can be used. Base material layer,
As the intermediate layer, for example, polyethylene terephthalate film, silica vapor deposition polyethylene terephthalate film, alumina vapor deposition polyethylene terephthalate film, stretched nylon film, silica vapor deposition stretched nylon film, alumina vapor deposition stretched nylon film, stretched polypropylene film, polyvinyl alcohol coated stretched polypropylene film, It can be appropriately selected and used from nylon 6 / meta xylene diamine nylon 6 co-extruded co-stretched film, polypropylene / ethylene vinyl alcohol copolymer co-extruded co-stretched film and the like.

Example samples and comparative example samples of the retort-compatible microwave oven packaging bag 10 according to the present invention were prepared in the following manner, and the state of automatic release of steam generated by heating in a 500 W microwave oven was checked. (Example) First, using a laminated film obtained by laminating the example sample with a polyethylene terephthalate film having a thickness of 12 μm, a silica vapor-deposited stretched nylon film having a thickness of 15 μm, and a 60 μm unstretched polypropylene film A in this order from the surface (see FIG. A pouch packaging bag as shown in a) was manufactured. In this bag making, the outer dimension of the pouch packaging bag is 150 × 220 mm, the height D of the fin portion 3 is 40 mm, and the distance A, B that determines the position distribution of the fin portion 3 in the longitudinal direction of the one surface 1 Shorter distance B
However, A is 140 so that it is less than 1/2 of the longer distance A.
mm and B are 60 mm, the inner dimension C of the opposing shorter side seal portions 2 and 2'is 130 mm, the distance F from the center point X of the surface to the nearest seal portion, and the processing portion of the automatic opening means. The distance E to 4 is 65mm, 4
The bag was made as 5 mm. Furthermore, the side seal portion 2,
The width of 2'is approximately 10 mm. As the automatic opening means, a dot-shaped seal portion 5 having a size as shown in FIG. 4B, which has a through hole 8 formed by a single cut in the center, is adopted. The shortest distance H between the through hole 8 and the outer edge of the dot-shaped seal portion 5 was set to 5 mm and was kept within the range of 3 to 10 mm. In addition, the seal strength of the point seal portion 5 of this example sample is 4 at room temperature.
4.0N / 15mm, 13.5N / 15mm at 90 ° C
Met. The open ends of the above example samples (see FIG.
From the front side of (a)), fill 200g of curry roux and
After sealing with a 0 mm width side seal and heating with a microwave oven, vapor was gently discharged from the through hole after about 2 minutes. At this time, there was no spilling of the contents. (Comparative Example 1) Next, as a comparative sample, the same sample as the example sample was prepared except that the unstretched polypropylene film B was used for the sealant layer. The seal strength of the point seal portion 5 of this comparative example sample is 59.4 at room temperature.
N / 15 mm and 27.8 N / 15 mm at 90 ° C. When this comparative sample was heated in the same manner as the example sample, after about 2 minutes, a part of the side seal part broke the bag and the contents were spilled. (Comparative Example 2) The same sample as that of the example was prepared except that the through hole 8 formed by cutting was not provided in the central portion of the dot-shaped seal portion 5. As a result of heating this in the same manner, the side seal part broke, ruptured with a loud noise, and the contents were scattered. (Comparative Example 3) A of the dimensions of the packaging bag in FIG.
And B were 100 mm and C was 130 mm. As a result of heating this in the same manner, the side seal part broke, ruptured with a loud noise, and the contents were scattered. (Comparative Example 4) Of the dimensions of the packaging bag in FIG.
And B are 160 mm and 40 mm respectively, and C is 130 m
The same thing as the example was prepared except that m and E were 95 mm and F was 65 mm. As a result of heating this in the same manner, the side seal part broke, ruptured with a loud noise, and the contents were scattered.

The retort-compatible microwave oven packaging bag 10 according to the present invention is not limited to the above description of the embodiments and drawings, and can be variously modified without departing from the gist of the present invention. For example, the structure of the pouch-shaped packaging bag may be any one as long as it can form a fin portion on one surface 1 thereof, and it does not necessarily have to be the films 1 to 3 as shown in FIG. The center seal portion of the packaging bag may be long-sealed and applied to the fin portion 3 according to the present invention. The packaging bag 10 for a microwave oven suitable for retort according to the present invention is also sufficiently applied as a packaging bag for a boil processed under milder temperature conditions.

[0012]

According to the packaging bag for a microwave oven compatible with the retort according to the present invention, the fin portion 3 is provided on one surface 1 of the pouch-shaped packaging bag, and the non-sealing portion N has at least one cutting blade or notch at the center thereof. First automatic opening means by forming a point-like seal part 5 having a through-hole 8, 8 ', and forming a point-like non-seal part 7 having at least one through-hole 8, 8'in its central part. Then, the second automatic opening means by surrounding the periphery thereof with the annular seal portion 6, the dot pattern seal portion 9 having at least one of the through holes 8 and 8'in the central portion is formed, and the periphery thereof is annular seal. By providing any of the third automatic opening means by being surrounded by the portion 6, the seal strength of the point seal portion 5 or the annular seal portion 6 is 23 N / 15 mm at room temperature.
Above, control to 20N / 15mm or less at 90 ° C or higher,
The distance from the center point X on the one surface 1 of the pouch-shaped packaging bag to the point seal portion 5 or the annular seal portion 6 is the distance from the center portion to the inner edge of the nearest side seal portion 2 for bag making. And the shortest distance H between the through holes 8 and 8 ′ and the outer edge of the point-like seal portion and the shortest width H of the annular seal portion are 3 to 10 mm.
By setting within the range of,
Of the distances between the fin portion 3 formed on the upper end and the inner edges of the side seal portions 2 and 2'substantially parallel to the fin portion 3, the shorter distance is set to 1/2 or less of the longer distance. As a result, it is a pouch-like packaging bag for retort use, but it does not burst even if it is heated in a microwave oven as it is, and it is easy to use even for contents with a lot of juice and it is easy to use. It is possible to provide a packaging bag for heating by a microwave oven or cooking.

[Brief description of drawings]

FIG. 1 is a perspective view of a packaging bag for a retort-compatible microwave oven according to the present invention.

FIG. 2 is an explanatory view of automatic opening means in the retort-compatible microwave packaging bag according to the present invention.

FIG. 3 is an explanatory view of a state when the automatic opening means of the retort-compatible microwave packaging bag according to the present invention functions.

FIG. 4 is a dimensional explanatory view of a main part of the retort-compatible microwave packaging bag according to the present invention.

FIG. 5 is an explanatory view of a guide seal in the fin portion of the retort-compatible microwave oven packaging bag according to the present invention.

[Explanation of symbols]

1 One side of pouch-shaped packaging bag 2, 2'Side seal part 3 Fin part 4 Processing part of automatic opening means 5 Point seal part 6 Annular seal part 7 Point non seal part 8 Cutting hole through hole 8'Notch Through hole 9 Point-shaped pattern seal portion 10 Peripheral portion of the retort-compatible microwave oven packaging bag S 3 according to the present invention X Center point of one surface of the pouch-like packaging bag G Guide seal portion H From the through hole to the dotted seal portion Shortest distance to the outer edge of /
Minimum width of annular seal

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3E064 AA05 BA16 BA24 BA36 BA40                       BA55 BB03 BC20 EA30 GA01                       HD02 HE10 HN05                 3E067 AB01 BA13A BB14A BB18A                       BB25A BC03A EA09 EE48                       FA01 FB13 FC01 GB02 GC02                 4B021 LA05 LA24 LP01 LP07 MC01

Claims (8)

[Claims] 1. On one surface of a pouch-shaped packaging bag made of laminated plastic films, opposing inner surfaces of the plastic film are sealed together at three peripheral portions, leaving an unsealed portion in the center. A packaging bag for a microwave oven compatible with a retort, wherein a fin portion that rises substantially vertically is formed on the surface, and the non-sealing portion of the fin portion is provided with a means for automatically releasing internal steam. 2. The automatic opening means is formed by forming a point-like seal portion having at least one through hole consisting of at least a cutting edge or a notch in a central portion thereof. Packaging bag for retort microwave oven. 3. The automatic opening means is formed by forming an annular seal portion around a point-like non-seal portion having at least one through hole in a central portion thereof. Retort-friendly microwave packaging bag. 4. The automatic opening means is formed by forming an annular seal portion around a dot-shaped pattern seal portion having at least one through hole in a central portion thereof. Retort-friendly microwave packaging bag. 5. The seal strength of the point seal portion or the annular seal portion after retort treatment is 23 at room temperature.
The retort-compatible microwave packaging bag according to any one of claims 1 to 4, which has a N / 15 mm or more and a temperature of 90 ° C or more and 20 N / 15 mm or less. 6. The reach distance from the center point of one surface of the pouch-shaped packaging bag to the point seal portion or the annular seal portion is from the center portion to the inner edge of the nearest side seal portion for bag making. The retort-compatible packaging bag for a microwave oven according to any one of claims 1 to 5, wherein the packaging bag is for a microwave oven. 7. The shortest distance between the through hole and the outer edge of the dot-shaped seal portion and the shortest width of the annular seal portion are 3 to 1.
7. It is in the range of 0 mm, and it is characterized by the above-mentioned.
A packaging bag for a microwave oven according to any one of 1. 8. Of the distances between the fin portions formed on one surface of the pouch-shaped packaging bag and the inner edges of both side seal portions substantially parallel to the fin portions, the shorter distance is the longer distance. It is 1/2 or less, The packaging bag for microwave ovens corresponding to the retort according to any one of claims 1 to 7.