JP5686565B2 - Packaging bag that also serves as a container for eating - Google Patents

Description

  The present invention relates to a packaging bag that also serves as a container for eating, and more specifically, the packaging bag heated from a microwave oven or the like is transferred from the surface of the filling without transferring the packing to other tableware or the like. The present invention relates to a packaging bag that is cut at the upper position to make it shallow and also serves as a tableware.

Solid foods, solid-liquid mixed foods, dried foods, etc. filled in packaging bags such as standing pouches and flat pouches are heated in a microwave oven while filling the packaging bag, and the heated fillings are used as tableware. It is generally performed to move to etc. and eat.
This packaging bag is opened or opened for ventilation before heating in order to avoid thermal expansion of the heated filling and increase in internal pressure due to the generation of water vapor, and to prevent breakage of the packaging bag.
In general, the position of opening before heating or the position of the cut of the ventilation notch is determined in the uppermost region of the packaging bag in fear of spilling of the filling material from the opening or the cut.

  Conventionally, a weakening line is provided at a desired opening position of a packaging bag in order to easily open for ventilation before heating. The weakening line is a linear region having a small width that can be easily torn with a force smaller than that of other portions.

  As a conventional technique related to weakening lines, a laminated film in which a first resin layer and a second resin layer having a higher melting point than the first resin layer are laminated on one side of a substrate as a laminate material constituting a packaging bag And providing a groove-shaped thinned weakened portion on the first and second resin layer sides can be opened linearly and easily, the sealing property is maintained, and the manufacture is easy. An easy-open packaging bag has been proposed (see, for example, Patent Document 1).

  As another conventional weakening-line technique, at least the outer surface layer and / or the intermediate layer is formed by superposing a laminate made of a molecularly oriented thermoplastic resin, and the upper sheet and the lower sheet have at least line tear scheduled portions. In the easily tearable packaging bag partially weakened, the outer surface resin layer and / or the intermediate resin layer of the linear tear scheduled portion has a width in the direction crossing the tear direction over a range larger than 1 mm. A melt-weakening resin layer is formed continuously in the transverse direction or intermittently in the transverse direction, and the outer surface resin layer and / or the intermediate resin layer of the linear tear planned portion has a water content of 0. JIS K0068. An easy-open packaging bag in which 1% by weight or more of a thermoplastic resin is weakened by foaming the resin has been proposed (see, for example, Patent Document 2). .

  As another conventional weakening wire technology, a linear opening continuous to the intermediate layer is provided at the opening position of the packaging bag made of a laminate in which a surface base material layer, an intermediate layer, and a thermoadhesive resin layer are sequentially laminated. In a packaging bag in which a notch is formed and a notch is provided in at least one of the side edge thermal adhesive portions of the packaging bag at both ends of the opening break, the notch is provided at a position away from the opening break, The side edge thermal bonding portion is formed such that the tip is located at the opening cut and the “edge-shaped” cut is formed through the laminate with respect to the outer edge of the side edge thermal bonding portion. A packaging bag has been proposed (see, for example, Patent Document 3).

Japanese Patent Laid-Open No. 10-081341 JP 2004-136980 A JP 2007-106497 A

  These weakening lines start at an arbitrary height position of the heat seal part on one side, extend horizontally, and end at the same height position of the heat seal part on the other side. No particular consideration is given other than minimizing spillage.

Notch portions are formed in the weakening line start portions on both side edges of the packaging bag, and the weakening line can be started to be cut relatively easily by a small gripping force and tearing force.
On the other hand, the heat-sealed heat-sealed portions on both sides of the packaging bag are about twice as thick as the other non-heat-welded bag portions, and the tear strength is also compared to the bag portions. Nearly twice as much. Therefore, when the tear line along the weakening line reaches the terminal heat seal portion, the unsealed person suddenly feels a large resistance, that is, a catch. As a result, the opener strengthens the gripping force by the finger gripping the bag body part below the weakening line containing much of the filling, and the gripping force by the finger gripping the top of the bag above the weakening line, The tearing power must be increased.

  The large resistance force that suddenly appears to tear when the above-mentioned tear line reaches the heat seal part near the end, and the larger tear force to exceed the resistance force, push the lower part of the bag below the weakening line. There is a high risk of crushing and spilling the filling. If the filling material overflows after heating with a microwave oven or hot water, problems such as burns will occur.

  Furthermore, the large resistance force that suddenly appears with respect to the tearing force when the above-described tear line reaches the end heat seal part is the constituent material such as the front side film of the bag part that is not thermally welded, and the back side film etc. When the tear line of the constituent material reaches different height positions, it becomes larger and its adverse effect becomes larger.

(Object of invention)
The present invention has been made in view of the above-described problems relating to tearing and opening of a package, and in view of changing the packaging bag into a packaging bag that can be used conveniently as a food container. In view of the depth as a container for eating, an object is to provide a packaging bag that also serves as a container for eating that can perform predetermined tearing along a weakening line.

The first invention includes at least a vertical seal portion provided at both left and right ends and an upper horizontal seal portion provided at the upper end, and the length of the vertical seal portion is not shorter than the length of the upper horizontal seal portion and is filled. A food bag that is heated by a microwave oven in a self-supporting state and also serves as a container for eating,
A weakening line that extends horizontally in a straight line between the vertical seal portions on the left and right side ends is provided at a position of 1/3 to 2/3 in height relative to the inner edge of the upper horizontal seal portion,
At least one inner edge of the vertical seal portion is provided with a protruding seal portion protruding inward and provided with a bag breakage preventing through-hole so as to cross the weakening line,
On the outer edge portion of the vertical seal portion, a tear start portion connected to the weakening line is provided,
On the inner edge of the projecting seal portion, a seal recess that intersects the weakening line is formed,
The packaging bag according to claim 1, wherein the bag breaking prevention through-hole is at a position on an extension line of an inner edge of the vertical seal portion or a position further entering the projecting seal portion.
The second invention comprises at least a vertical seal portion provided at both right and left ends and an upper horizontal seal portion provided at the upper end, and the length of the vertical seal portion is not shorter than the length of the upper horizontal seal portion and is filled. The food in a packaging bag that is heated by a microwave oven in a self-supporting state and also serves as a container for eating,
A weakening line that extends horizontally in a straight line between the vertical seal portions on the left and right side ends is provided at a position of 1/3 to 2/3 in height relative to the inner edge of the upper horizontal seal portion,
At least one inner edge of the vertical seal part is provided with a projecting seal part projecting inward so as to cross the weakening line,
On the outer edge portion of the vertical seal portion, a tear start portion connected to the weakening line is provided,
On the inner edge of the projecting seal portion, a seal recess that intersects the weakening line is formed,
The tear start portion is a position where the top portion is at least on the extension line of the inner edge of the vertical seal portion,
The packaging bag is filled with food so that the top surface of the food after heating is below the weakening line.

  According to the packaging bag serving also as the eating container of the present invention, the packaging bag can be easily cut along the weakening line with a smooth tearing force in consideration of the depth as the eating container. Can be configured. That is, it has the effect that it can be set as the container for eating by the smooth predetermined tear along the said weakening line.

Further, by setting the position of the weakening line to a height position 1/3 to 2/3 with reference to the inner edge of the upper horizontal seal portion of the packaging bag, the packaging bag having a suitable depth as a container for eating The amount of food filling is not too small, and conversely it is not too much.
Note that the fact that the filled food is heated in a self-supporting state includes methods such as heating the filled food with a microwave oven and heating with hot water injection, and the like. In the case of heating mixed food, it is heated in a microwave oven, but in the case of heating powdered food (such as soup) and dried food (such as puffed rice), it is heated by hot water injection.

(Embodiment of the Invention)
In the first invention, the packaging bag is a standing pouch.

  1st invention WHEREIN: The said packaging bag is a packaging bag which maintains a self-supporting state with a standing holder, It is characterized by the above-mentioned.

It is a top view of the packaging bag of a 1st embodiment. FIG. 2 is an enlarged plan view of a protruding seal portion in FIG. 1. It is a top view of the packaging bag of 2nd Embodiment. It is a top view of the packaging bag of this invention used in the comparative experiment. It is a top view of the packaging bag other than this invention used by the comparative experiment.

Below, the packaging bag of embodiment of this invention is demonstrated based on drawing.
(Packaging bag of the first embodiment)
The packaging bag 100 of 1st Embodiment is what is called a standing pouch which consists of a flat packaging bag, as shown in FIG.

The material of the packaging bag 100 is not particularly limited, but a laminate including at least a base film and a heat sealable film is used.
Specific examples of the base film include polyester resins, polyamide resins, polyaramid resins, polyolefin resins, polycarbonate resins, polystyrene resins, polyacetal resins, and fluorine resins.
As the plastic film or sheet made of these materials, either an unstretched film or a stretched film stretched in a uniaxial direction or a biaxial direction can be used. Moreover, what made gas permeability small by various methods can also be used for these films.

Examples of the heat sealable film include low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer. Polymers, ethylene-ethyl acrylate copolymers, ethylene-methacrylic acid copolymers, ethylene-methyl methacrylate copolymers, ethylene-propylene copolymers, methylpentene polymers, polybutene polymers, polyolefins such as polyethylene or polypropylene Acid-modified polyolefin resin, polyvinyl acetate resin, poly (meth) acrylic resin, polychlorinated resin modified with unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid Vinyl resin It can be a film or using the sheet.
The packaging bag 100 uses the above-mentioned laminated body, and is folded by facing the inner heat-sealable resin layer facing each other, or by superimposing them and heat-sealing the peripheral edge. Configured.

  Moreover, as a base film used as an intermediate | middle layer, the film which gave vapor deposition of inorganic substances, such as polyethylene, a polypropylene, a polycarbonate, an ethylene-propylene copolymer, an ethylene-vinyl acetate copolymer, silicon oxide, aluminum oxide, for example Or, there are paper, synthetic paper, and the like.

  As a bag-making method, the inner layer surface of the above laminate is opposed and folded, or the inner layer surfaces of the two laminates are overlapped, and the peripheral edge of the outer periphery is, for example, a side seal type, two Heat seal by heat seal type such as side seal type, three side seal type, four side seal type, envelope sticker seal type, jointed seal type (pillow seal type), pleated seal type, flat bottom seal type, square bottom seal type, etc. Various types of flexible packaging bags (not shown) constituting the composite container (not shown) according to this embodiment are manufactured. The above heat sealing method is known, and examples thereof include a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, and an ultrasonic seal.

As shown in FIG. 1, the packaging bag 100 of 1st Embodiment is equipped with at least the vertical seal | sticker part 102 provided in the right-and-left both ends, and the upper horizontal seal | sticker part 104 provided in the upper end, and the filled food is a self-supporting state. It is a packaging bag that also serves as a container for eating, and has a laminated structure shown as transparent vapor-deposited biaxially stretched polyester / biaxially stretched polyamide / unstretched polypropylene. In the packaging bag 100, the outer surface height v of the packaging bag is equal to or longer than the outer surface lateral width h of the packaging bag. For example, v = 165 mm and h = 129 mm. The vertical seal width w of the vertical seal portion 102 is equal to the upper horizontal seal w of the upper horizontal seal portion 104. For example, w = 6 mm.
The vertical seal width w is preferably 4 to 8 mm. When the width of the vertical seal is less than 4 mm, sufficient seal strength, that is, a seal strength of 2.3 kg / 15 mm or more required for retort food packaging bags according to Ministry of Health and Welfare Notification No. 370 “Standard for Food, Additives, etc.” There is a possibility that it cannot be obtained. When the width | variety of a vertical seal | sticker part is larger than 8 mm, the seal | sticker intensity | strength required as a packaging bag will be exceeded and an unnecessary seal | sticker part will be included.

The packaging bag 100 has a linear shape extending between the vertical seal portions 102 at both left and right ends at a position of 1/3 to 2/3 in height relative to the inner edge of the upper horizontal seal portion 104. A weakening line 132 extending horizontally is provided. As will be described later, the weakening line 132 has an effect of cutting the packaging bag 100 along the weakening line 132 so that the packaging bag 100 can be used as tableware.
A projecting seal portion 110 projecting inward of the packaging bag 100 is formed at the center in the height direction of the vertical seal portions 102 on both sides. That is, the protruding seal part 110 is provided so as to intersect the weakening line. The protruding seal part 110 is a trapezoid having a height p, an upper side ts, and a bottom side bs. For example, p = 3 mm, ts = 20 mm, and bs = 32 mm.

  As shown in FIGS. 1 and 2, a pouch-breaking through-hole 120, which is a through-hole, is provided in the lower portion of the pouch height direction in the seal area of the protruding seal portion 110. The position of the bag breakage prevention through-hole 120 is a position slightly below the weakening line 132 and a position on the extension line of the inner edge of the vertical seal portion 102 or a position further entering the protruding seal portion 110. . In addition, as mentioned above, the shape of the bag breakage preventing through-hole can be a circular hole shape, a cross shape, a U-shape, or a modification thereof.

The packaging bag 100 further includes an upper cut 130 as shown in FIG.
The upper notch 130 is used for opening the packaging bag 100 prior to heating in order to prevent broken bags. The upper notch 130 may have a U shape, a straight line, or an arc shape in addition to the V shape.

Prior to heating by microwave oven or hot water injection or the like, the packaging bag 100 is used by cutting a part or all of the upper part from the upper notch 130 with the upper notch 130 so that part or all of the upper part of the packaging bag 100 is removed. Open.
Thereafter, the filling in the packaging bag 100 is heated by a microwave oven, hot water injection, or the like. Water vapor generated from the filling by heating is released out of the packaging bag 100 through an opening formed by cutting the upper cut 130.

  In the case of heating by microwave oven or hot water injection, in the case of microwave oven heating, if heating is performed without performing the opening by the upper notch 130 prior to the heating, as the microwave oven heating proceeds, water vapor from the filled solid food etc. This occurs and the inside of the packaging bag 100 becomes high pressure, and the packaging bag 100 expands. The bulge of the packaging bag 100 is spherical or nearly spherical. That is, in the plan view of FIG. 1, the central portion C of the packaging bag 100 has the greatest thickness.

When heating further proceeds from this state, the packaging bag 100 expands further, and a force (hereinafter referred to as bag breaking force) that causes the packaging bag 100 to rupture or peel off the bonded portion is shown in FIG. As shown by a dotted line 150 centering on the central portion C, it spreads concentrically.
As a result, the bag breaking force acts on the protruding seal portion 110 first, and the protruding seal portion 110 is peeled off. When peeling of the protruding seal part 110 proceeds, the peeling eventually reaches the bag breaking prevention through-hole 120 and aeration is performed, and there is no possibility of bag breaking. During this time, since the distance from the center portion C of the portion other than the protruding seal portion 110 of the vertical seal portion is larger than the protruding seal portion 110, the protrusion of the vertical seal portion protrudes from the portion other than the protruding seal portion 110 of the vertical seal portion. A bag breaking force larger than the bag breaking force acting on the seal portion 110 does not act.

After the heating is completed, the packaging bag 100 is cut along the weakening line 132, and the packaging bag 100 having an appropriate depth is used as tableware, which is heated by the microwave oven, hot water injection, or the like. Eat things.
At both ends of the weakening line 132, that is, at the outer edge of the vertical seal part 102, arc-shaped tear start parts 134 are provided in order to make it easy to start cutting the weakening line 132.
The inner end of the packaging bag of the arc-shaped tear start portion 134, that is, the top of the arc shape, is determined so as to be outside the packaging bag with respect to the inner edge of the vertical seal portion 102. The arc-shaped tear start portion 134 may be U-shaped, V-shaped, straight, or the like other than the arc shape, as in the case of the upper notch 130 described above.

On the inner edge of the packaging bag of the projecting seal portion 110, a concave portion that is not thermally welded, that is, a circular arc recess 136 is formed so as to cross the weakening line.
The arc recess 136 is cut when the cut starting from the arc cutting start portion 134 on the other side reaches the arc recess 136 on the other side at different height positions between the front film and the back film of the packaging bag 100. Has a function of making the cuts whose height positions are different on the front and back surfaces to the same height position while proceeding from the arc recess 136 to the arc-shaped tear start portion 134.

(Packaging bag of the second embodiment)
As shown in FIG. 3, the packaging bag 200 of the second embodiment is bilaterally symmetric, and the same reference numerals as those of the packaging bag 100 of the first embodiment are the same as those of the packaging bag 100 of the first embodiment. The description is omitted.

When the height a inside the packaging bag is 153 mm, it intersects the weakened line 232 provided at a distance of a / 3 from the inner edge of the upper horizontal seal portion, that is, 51 mm from the inner edge of the upper horizontal seal portion. Projecting seal portions 210 projecting inward are formed at the inner edge portions of the vertical seal portions 202 on both sides. The protruding seal part 210 is a trapezoid having a height p, an upper side ts, and a bottom side bs. For example, p = 3 mm, ts = 20 mm, and bs = 32 mm.
As shown in FIG. 3, a substantially v-shaped notch 234 for preventing bag breaking is formed in the central portion in the height direction of the protruding seal portion 210. The notch 234 for preventing bag breaking on both sides is connected by a cut 232 made of a weakening line such as a half-cut line for facilitating cutting and opening.

  The depth of the substantially v-shaped notch 234 for preventing bag breaking is determined so that at least the top 238 of the notch 234 is located on the extension line of the inner edge of the vertical seal portion 202. Note that the notch 234 for preventing bag breaking is not limited to a substantially v shape, and may be a U shape or the like.

(Comparative experiment)
The experimental packaging bag shown in FIGS. 4 and 5 is composed of a laminate including a transparent vapor-deposited biaxially stretched polyester, a base film that is a biaxially stretched polyamide, and a heat-sealable film that is an unstretched polypropylene. In order to confirm the effect of the cut and the arc recess, using a packaging bag having an outer surface height v = 165 mm, a lateral width h = 129 mm of the packaging bag, and a vertical seal width w = 6 mm of the longitudinal seal portion 102. A comparative experiment was conducted.
The experimental packaging bag is a standing pouch and has a gusset portion 250 having a width of 34 mm.

  The protruding seal portion 110 at the center in the height direction of the vertical seal portions 102 on both sides is a trapezoid having a height p = 3 mm, an upper side ts = 20 mm, and a bottom side bs = 32 mm. An arc-shaped cut 252 having a radius of 1.5 mm was provided on the outer edge of the vertical seal portion 102.

  As shown in FIG. 4, the first experimental packaging bag 300 has a semicircular arc recess 136 having a radius of 3 mm. As shown in FIG. 5, the second experimental packaging bag 400 does not have an arc recess, and other configurations are the same as those of the first experimental packaging bag 300.

The first experimental packaging bag 300 and the second experimental packaging bag 400 of FIG. 4 were filled with 160 g of cooked penne and sauce and subjected to retort processing. Prior to heating by the microwave oven, a ventilation notch was made from the first notch 260 provided at the upper outer edge of the vertical seal portion 102. Thereafter, the first experimental packaging bag 300 and the second experimental packaging bag 400 were both housed in a paper sleeve and heated in a microwave oven at 600 W output for 1 minute, and the following comparative experiments were performed.
The comparative experiment (evaluation) was carried out by a total of 60 people including 30 women in their 20s and 30 women in their 30s. The experimenter cut from the cut 252 on one side to the cut 252 on the other side via the weakening line 132 so that the first experimental packaging bag 300 and the second experimental packaging bag 400 could be eaten. The evaluation of this cut is as follows.

Evaluation First experimental packaging bag 300 (present invention) Second experimental packaging bag 400
Easy to cut 12 (20.0%) 2 (3.3%)
Slightly easy to cut 25 (41.7%) 16 (26.7%)
8 (13.3%) 9 (15.0%)
Not very easy to cut 12 (20.0%) 30 (50.0%)
Hard to cut 3 (5.0%) 3 (5.0%)

  From the above evaluation, it is understood that the first experimental packaging bag 300 (the present invention) can be cut more easily than the second experimental packaging bag 400, and the first experimental packaging bag 300 (the present invention) can be eaten more easily. it can.

(Modification)
Although the embodiment of the packaging bag of the present invention is symmetrical, the packaging bag of the present invention does not require symmetry. The packaging bag of the present invention can effectively obtain the action and effect of the packaging bag of the present invention even if the protruding seal portion is provided only on one vertical seal.

DESCRIPTION OF SYMBOLS 100 Packaging bag 102 Vertical seal part 104 Upper horizontal seal part 110 Projection seal part 120 Bag-breaking prevention through-hole 130 Upper notch 132 Weak line 134 Arc-shaped tearing start part 136 Arc dent

Claims (4)

At least a vertical seal portion provided at both right and left ends and an upper horizontal seal portion provided at the upper end, the length of the vertical seal portion is not shorter than the length of the upper horizontal seal portion, and the filled food is in a self-supporting state A packaging bag that is heated by a microwave oven and also serves as a container for eating,
A weakening line that extends horizontally in a straight line between the vertical seal portions on the left and right side ends is provided at a position of 1/3 to 2/3 in height relative to the inner edge of the upper horizontal seal portion,
At least one inner edge of the vertical seal portion is provided with a protruding seal portion protruding inward and provided with a bag breakage preventing through-hole so as to cross the weakening line,
On the outer edge portion of the vertical seal portion, a tear start portion connected to the weakening line is provided,
On the inner edge of the projecting seal portion, a seal recess that intersects the weakening line is formed ,
The packaging bag, wherein the bag breakage preventing through-hole is at a position on an extension line of an inner edge of the vertical seal portion or a position further entering the protruding seal portion .   The packaging bag according to claim 1, wherein the packaging bag is a standing pouch.   The packaging bag according to claim 1, wherein the packaging bag is a packaging bag that maintains a self-supporting state by a standing holder.   At least a vertical seal portion provided at both right and left ends and an upper horizontal seal portion provided at the upper end, the length of the vertical seal portion is not shorter than the length of the upper horizontal seal portion, and the filled food is in a self-supporting state In addition to being heated by a microwave oven, it is a food in a packaging bag that also serves as a container for eating,
  A weakening line that extends horizontally in a straight line between the vertical seal portions on the left and right side ends is provided at a position of 1/3 to 2/3 in height relative to the inner edge of the upper horizontal seal portion,
  At least one inner edge of the vertical seal part is provided with a projecting seal part projecting inward so as to cross the weakening line,
  On the outer edge portion of the vertical seal portion, a tear start portion connected to the weakening line is provided,
  On the inner edge of the projecting seal portion, a seal recess that intersects the weakening line is formed,
  The tear start portion is a position where the top portion is at least on the extension line of the inner edge of the vertical seal portion,
  A food in a packaging bag, wherein the packaging bag is filled with a food so that the upper surface of the food after heating is below the weakening line.

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