JP2017047952A - Package for microwave-heating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package which is constituted by superimposing a plurality of films including a front side film 11 and a back side film 12 and hermetically sealing a periphery thereof, has a bending portion b11 at a part of a seal line b1 of the periphery, and can ensure a discharge channel of steam during microwave-heating while preventing the front side film and the back side film from adhering to each other.SOLUTION: At a part of an area B surrounded by a bending portion b11 and film end edges 11x and 12x, embossments 21 and 22 are provided on either one of a front side film or a back side film, and a clearance C is formed between the front side film and the back side film by the embossments 21 and 22.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a package in which contents are contained and sealed in a packaging bag. This package can be cooked by heating in a microwave while packaging the contents.

  When cooking by heating in a microwave oven with the food contents packed in a packaging bag, water vapor is generated from the food contents with heating, so it is necessary to release this water vapor to the outside of the package. Become. Many types of such steam venting mechanisms are known. For example, in Patent Document 1, a part of a packaging bag is peeled off due to an increase in internal pressure caused by microwave heating, and is provided at this peeling position. A package that discharges water vapor from the vent holes is described.

  The package described in Patent Document 1 has a structure as shown in FIG. That is, the packaging bag used for this package is composed of three members: a front film 11, a back film 12, and a bottom film 13 folded in half. The bottom film 13 is sandwiched between the front film 11 and the back film 12 so that the fold line 13x faces upward, and is heat-sealed around the periphery. In the drawing, a and b indicate side seal lines arranged above the folding line 13x. Here, since the bottom film 13 does not exist, the front film 11 and the back film 12 are directly heat sealed. . Further, since the bottom film 13 exists below the folding line 13x, the bottom seal line c1 in which the front film 11 and the bottom film 13 are heat-sealed, and the back film 12 and the bottom film 13 are heated. A sealed bottom seal line is formed. And in the position above the bending line 13x, the side seal line b is provided with a bent part b1 bent so as to form a convex part from the film edge toward the inside of the package.

  When the contents are accommodated and sealed in this packaging bag and heated in a microwave oven, the package body expands due to an increase in internal pressure accompanying microwave heating, and the bent portion b1 peels off due to the expansion pressure. And the inside and outside of the package communicate with each other at the bent portion b1, and water vapor can be released to the outside of the package.

Japanese Utility Model Publication No. 04-10079

  However, in the package described in Patent Document 1, after the bent portion is peeled off due to the expansion pressure accompanying microwave heating, the front side film and the back side film are wet by the condensed water vapor, and thus the wet front side film and the back side film are mutually attached. Adhering to each other, the release of water vapor was sometimes disturbed.

  Therefore, the present invention has an object of providing a package in which the front film and the back film are not in close contact with each other even when condensation occurs on the front film or the back film after the bent portion is peeled off by microwave heating. To do.

That is, the invention according to claim 1 is a packaging body configured by stacking a plurality of films including a front side film and a back side film and sealing the periphery to seal a part of the surrounding seal line. In the packaging body having a bent portion bent so as to form a convex portion from the film edge toward the inside of the packaging body,
In a part of the region surrounded by the bent portion and the film edge, either one of the front film and the back film is embossed,
By this embossing, a gap is formed between the front side film and the back side film.

  Next, the invention according to claim 2 is configured such that the emboss forms a convex portion from one film toward the other film, and a front side film and a back side film are formed around the convex portion. The microwave oven packaging body according to claim 1, wherein a gap is formed between the two.

  The invention according to claim 3 is configured such that the emboss forms a recess from one film toward the other film, and a gap is formed between the front film and the back film in the recess. It is formed, It is the package for microwave oven heating of Claim 1 characterized by the above-mentioned.

  According to the present invention, a part of the region surrounded by the bent portion and the film edge is embossed, and by this embossing, a gap is formed between the front film and the back film, Even when condensation occurs on the front film and the back film, a gap is maintained between the front film and the back film. For this reason, the close contact between the two is hindered, and a water vapor discharge passage is reliably secured.

FIG. 1 shows an example of a packaging bag according to the present invention, FIG. 1 (a) is a front view thereof, and FIG. 1 (b) is a sectional explanatory view showing components of the packaging bag separated for convenience of explanation. is there. FIG. 2 relates to an example of a packaging bag according to the present invention, and both FIG. 2 (a) and FIG. FIG. 3 relates to an example of a packaging bag according to the present invention, and FIGS. 3A to 3F are explanatory diagrams showing examples of embossed patterns. FIG. 4 is an explanatory view showing an example of a bent portion. FIG. 5 shows an example of a conventional packaging bag, FIG. 5 (a) is a front view thereof, and FIG. 5 (b) is a cross-sectional explanatory view showing components of the packaging bag separated for convenience of explanation.

  The package of the present invention is configured by accommodating and sealing the contents in a packaging bag. This package is used for the purpose of heating in a microwave oven without taking out the contents. For this reason, as the contents, food contents to be cooked are desirable. For example, it is Shumai which cooks by steaming.

  Further, the packaging bag is configured by stacking a plurality of films including a front side film and a back side film and sealing the periphery.

  The form of the packaging bag may be arbitrary, for example, a four-side sealed bag or a three-side sealed bag. In this case, the packaging bag is composed of two films including a front film and a back film. The seal lines formed by the seal are five side seal lines, two side seal lines, two bottom seal lines, and a top seal line.

The packaging bag may have a standing pouch shape. Drawing 1
Is an example of a packaging bag having the form of a standing pouch. In this case, the packaging bag 1 needs to use a double-folded bottom film 13 in addition to the front film 11 and the back film 12. The bottom film 13 is sandwiched between the front film 11 and the back film 12 so that the fold line 13x faces upward, and is heat-sealed around. The seal lines formed by the seal are five seal lines including two side seal lines a and b, two bottom seal lines c1 and c2, and a top seal line d. Since the bottom film 13 does not exist at the side seal lines a and b above the fold line 13x, the front film 11 and the back film 12 are directly heat sealed. Further, since the bottom film 13 exists at the bottom seal lines c1 and c2 below the folding line 13x, the front film 11 and the bottom film 13 are heat-sealed, and the back film 12 and the bottom film 13 are Heat sealed.

  Regardless of the form of the packaging bag 1, it is necessary to provide a bent portion in a part of the surrounding seal line. This bent portion is peeled off when heated in a microwave oven, and has a function of forming a water vapor discharge channel by communicating the inside and outside of the package. For this reason, as shown to Fig.1 (a), the bending part b1 needs to be bent so that a convex part may be formed toward a package body inside direction from a film edge.

  In addition, as for this bending part, it is desirable to be provided in the sealing wire by which the front side film 11 and the back side film 12 were directly heat-sealed. When the packaging bag 1 has the form of a standing pouch, it is a part of the side seal lines a1 and b1 as shown in FIG. Further, a bent portion may be provided in a part of the top seal line d.

  In this example, the bent portion b1 has a U shape, but may have a V shape as shown in FIG.

  And the packaging bag which concerns on this invention is embossed in any one of the said front side film 11 and the back side film 12 in a part of area | region B enclosed by the bending part b1 and film edge 11x, 12x. The gap C needs to be formed between the front film 11 and the back film 12 by the embossing.

  The embossing may be convex in any direction. FIG. 2A is a cross-sectional explanatory view of a main part showing a state where the back film 12 is provided with an emboss 21 so as to form a convex portion toward the front film 11. As can be seen from this figure, since the front film 11 has a smooth cross-sectional shape so as to contact the convex portion, a gap C is formed between the front film 11 and the back film 12 around the convex portion. The height of the emboss 21 is preferably 0.1 mm or more.

  On the other hand, FIG. 2B shows a state in which the emboss 22 is applied to the front film 11 so as to form a convex portion on the opposite side of the back film 12, that is, to form a concave portion toward the back film 12. FIG. As can be seen from this figure, a gap C is formed between the front film 11 and the back film 12 in this recess. It is desirable that the depth of the recess is 0.1 mm or more.

  In addition, although embossing can also be given to both the front side film 11 and the back side film 12, an embossing must be formed so that the clearance gap C may be formed also in this case. For example, it is a case where it forms in another position which does not correspond mutually. Alternatively, an emboss is formed on the front film 11 so as to form a convex portion from the front film 11 toward the back film 12, while a back film 12 is formed so as to form a convex portion from the back film 12 toward the front film 11. The embossing is formed on the two and the two convex portions are arranged so as to face each other.

  These embossed patterns are arbitrary. For example, it is possible to employ embossing having a pattern as shown in FIGS. FIG. 3A shows a pattern of circular embosses 21 and 22. FIG. 3B shows a triangular emboss pattern. FIG. 3C shows an emboss pattern in which a plurality of straight lines are arranged radially, and FIG. 3D shows an emboss pattern in which a plurality of wavy lines are arranged in parallel. FIG. 3E shows a polka dot emboss pattern in which a plurality of dots are arranged, and FIG. 3F shows a convex emboss pattern.

  In addition, as a material of the front side film 11 and the back side film 12, as long as it can permeate | transmit the microwave of a microwave oven, arbitrary films can be employ | adopted. For example, it is a laminated film constituted by laminating a sealant layer on a base film. Moreover, when the packaging bag 1 has the form of a standing pouch, as the film 13 for bottom parts, the film of the material similar to the front side film 11 and the back side film 12 can be used.

  Here, as a base film, the film of a single layer or a laminated structure can be used. For example, it is a single layer film such as a polyester film, a polyamide film, or a polyolefin film. Moreover, the film of the multilayer structure which laminated | stacked these may be sufficient. Moreover, you may use the film in which inorganic vapor deposition layers, such as aluminum foil and a silicon oxide, were formed. It is also possible to use a film on which various coating films are formed. Examples of the coating film include a gas barrier coating film formed by applying a coating liquid containing a metal alkoxide and heating and curing.

  As the sealant layer, a polyolefin-based resin is suitable. For example, low density polyethylene resin, linear low density polyethylene resin, polypropylene resin, mixed resin of polyethylene resin and polybutene resin, and the like.

  The package of the present invention can be manufactured by storing the contents in the packaging bag 1 and sealing the contents. In FIG. 1 (a), A has shown the storage chamber which accommodates the content. And the package which accommodated and sealed the content in this way can be heated in a microwave oven as it is, without taking out the content from now on. The bending part b11 peels off by the expansion pressure accompanying microwave heating, and the inside and outside of the package communicate with each other to form a water vapor discharge channel. At this time, since the gap C by embossing is formed in the region B surrounded by the bent portion b1 and the film edge, the front film 11 and the back film 12 do not adhere to each other, and the discharge flow path is reliably ensured. can do.

  For all of the front film 11, the back film 12, and the bottom film 13, a standing pouch 1 shown in FIG. 1 was manufactured using a laminated film in which a base film and a sealant layer were laminated. Note that six types of standing pouches 1 having the patterns of FIGS. 3A to 3F were manufactured as embossed patterns. The base film is obtained by laminating a polyamide film on the vapor deposition surface of a metal vapor deposited polyester film. The sealant layer is an unstretched polypropylene film.

  This standing pouch 1 was filled and sealed with 200 ml of water, heated in a microwave oven at 500 W for 2 minutes, and then checked whether or not the front film 11 and the back film 12 were in close contact with each other in the region B. In the patterns 3 (a) to (f), adhesion was not observed.

For comparison, a standing pouch that was not embossed was manufactured and confirmed in the same manner. As a result, in the region B, the front film 11 and the back film 12 were in close contact with each other, and the water vapor discharge passage was closed.

1: Packaging bag 11: Front side film 11x: Film edge 12: Back side film 12x: Film edge 13: Film for bottom 13x: Folding line 21: Emboss 22: Emboss a: Side seal line a1: Upper side seal line a2 : Lower side seal line b: Side seal line b1: Upper side seal line b11: Bent part b2: Lower side seal line c: Bottom seal line d: Top seal line A: Housing chamber B: Bent part and film edge Area surrounded by edge C: Gap

Claims (3)

A packaging body configured by stacking a plurality of films including a front side film and a back side film and sealing the periphery to seal, and a part of the surrounding sealing line is directed from the film edge to the inside of the packaging body In a package having a bent portion bent so as to form a convex portion,
In a part of the region surrounded by the bent portion and the film edge, either one of the front film and the back film is embossed,
A package for heating a microwave oven, wherein a gap is formed between the front film and the back film by the embossing.   The emboss is configured to form a convex portion from one film to the other film, and a gap is formed between the front film and the back film around the convex portion. The microwave oven packaging body according to claim 1.   The embossing is configured to form a recess from one film toward the other film, and a gap is formed between the front film and the back film in the recess. The package for heating a microwave oven according to 1.