JP2010132342A - Packaging bag, packaged food using the same, and method for packaging food using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To disclose a packaging technique capable of packaging a soft food having a triangle shape in a side view such as sandwich or the like. <P>SOLUTION: Two sheets of packaging films are made into an approximately isosceles trapezoidal bag having an opening on the bottom side. A foldable fold piece is formed on the bottom side of each film to clog the opening. The margin end of one fold piece is further folded toward the opposite side to form an extended overlap piece with whose inner surface the inner surface of another fold piece overlaps. A heat-sensitive or pressure-sensitive adhesive layer is mounted on at least the overlapped inner surface of one fold piece and another fold piece. The overlapped piece of the surplus film folded and spread to both the outer sides of the bonded part is sealed by welding and cutting to form a pair of ear parts. The overlapped piece is turned up at the tip end of a spatulate folding fixture as a base end, and another fold piece is pressed and bonded to the overlapped piece at the tip end as a receiving part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a packaging bag suitable for a triangular-shaped food such as a sandwich, a packaged food using the same, and a packaging method for the packaging bag. It is about.

  In the present invention, a conventional packaging technique will be described by taking a sandwich whose side view scheduled as one of the contents is cut into a right triangle as an example. The general packaging body includes two transparent films for packaging, and a short side. The upper bottom part of the side and a bag with a substantially isosceles trapezoidal shape with both sides closed, and after opening the lower bottom part of the long side and inserting the sandwich from the tip on the acute angle side, the excess film generated around the opening It was folded inward so as to close from four sides, and as a result, a label, a cellophane tape, or the like was attached to the portion where the film was folded to seal the opening (for example, Patent Document 1).

  This general packaging bag not only has a raised appearance due to the film in which the sealed opening is folded, but also has poor stability to make it self-supporting as a bottom surface, and the opening is not completely sealed. The communication with the water caused the content to dry (wet), and sometimes even foreign objects and insects could be mixed in the bag.

  Therefore, the present applicant has proposed a technique of coating or laminating a low melting point resin on the film surface corresponding to the surplus portion and bonding the folded films by heating and pressing at the folding stage of the surplus film ( Patent Document 2). According to the packaging technique disclosed in Patent Document 1, since the folded portion of the surplus film is bonded, the sealing performance is exhibited, and the rise of the folded portion is somewhat lowered by pressing in the bonding process. Can do.

Japanese Utility Model Publication No. 6-35144 JP-A-7-206064

  However, the above-described conventional packaging technique is to fold the surplus film inward from the four sides of the opening anyway, and since the folded surplus film has the maximum number of overlaps in the vicinity of the center of the opening, In order to make the sealing surface of the opening self-supporting, the stability is still insufficient, and if the sealing structure is to be improved, it is necessary to use a thicker film to increase the strength of the side surface. Affects production costs. In addition, folding of the surplus film is performed by the procedure of folding a pair of opposite sides and then folding the remaining opposite sides, so the number of steps is complicated and the number of films is increased by the previous folding. Increases, and a larger folding force is required, and there is a possibility that the corners of the sandwich may be crushed or deformed by the folding force. Also, while maintaining the previous fold, the next fold must be done so as not to deform the contents, so skill is required to do it manually, and if you try to do it mechanically, Is extremely complicated.

  The present invention has been made to solve the above-mentioned problems. In short, it can be packaged without deforming a food having a triangular shape such as a sandwich, as viewed from the side, and is stable after packaging even if the film thickness is reduced. It is an object of the present invention to disclose a packaging technique that can stand up and can perform the packaging form in a simpler process than before.

  In order to achieve the above-described object, in the present invention, two front and back packaging films are formed in a substantially isosceles trapezoidal shape with an opening on the lower bottom side, and the opening is folded on the lower bottom side of each of the films so as to be closed. The bent piece is formed to bend, and the folded piece on one side of the front and back is further folded back to the opposite side, and the other folded piece and the inner surface are overlapped with each other. A packaging bag was formed by means of providing an adhesive layer having heat sensitivity or pressure sensitivity on at least one overlapping inner surface of the overlap piece or the other folded piece.

  In addition, the packaged food of the present invention in which a food product having a triangular shape in a side view, such as a sandwich, which has been formed in a triangular shape in a side view is put into the packaging bag and the opening is closed, the overlap piece of the packaging bag is folded back. A pair of left and right ears are formed by fusing and sealing the front and back overlapping portions of the surplus film folded on both sides of the bonding portion while being bonded to the other folded piece.

  Furthermore, as a packaging method for sandwiches and the like using the packaging bag, in the present invention, food in a triangular shape in a side view is introduced into the packaging bag, and the surplus film formed on both sides of the folded pieces on both the front and back sides is provided. It is more preferable to use a means of bending and folding the overlap piece in the left and right direction, fusing and sealing the front and back overlapped portions of the surplus film folded to the left and right after folding the overlap piece and bonding with the other folded piece. As a selective means, a folding tool having a spatula-like tip is placed along the surface of one folding piece, the overlap piece is folded with the leading end as a base end, and the other folding piece is received with the folding jig as a receiving portion. Is pressed so as to adhere to the overlap piece. In the present invention, the “melting seal” is a concept including a mode in which cutting and sealing are performed after sealing, in addition to a mode in which sealing and cutting of an excess film are performed simultaneously. Specifically, the former is to cut while welding a surplus film using a heat cutter with a heated blade, for example, and the latter is a separate process after sealing by heat sealing, ultrasonic sealing, high frequency sealing, etc. In any case, conventionally known techniques can be employed.

  According to the above means, the overlap piece and the folded piece are bonded together, and the surplus film on both sides thereof is fused and sealed, so that the opening is closed in a sealed state. In addition, when the opening is closed, the front and back films only overlap the overlap between the overlap piece and the folded piece, and the number of overlaps is smaller than before, and the left and right ears folded on both sides expand the bottom area. To increase the independence of prepackaged food. Further, the spatula-shaped folding jig forms a folding line for folding the overlap piece in the same direction when the other folded piece is folded, and the overlap piece and the folded piece as a receiving part at the time of bonding. Is firmly clamped between the pressurizing machine and the pressure machine. In addition, by using the spatula tip of the folding jig as a heat-resistant conductive material, it is possible to prevent the heat at the time of bonding from being transmitted to the food side.

  By the way, according to the means described so far, the overlap piece and the other folding piece are superposed and the right and left sides are fused and sealed, so that the bag is completely sealed and no foreign matter is mixed inside. There is a gap between the overlap piece and one folded piece. This gap is a portion into which the tip of the folding jig is inserted when the overlap piece and the other folding piece are bonded. After packaging is completed, a label with product information or the like is usually affixed to this part, so there is almost no gap and basically no foreign matter is likely to enter this part. When the label is not attached, or when the label is not attached properly, foreign matter may enter the gap. And, as described above, this foreign matter is merely entering the gap between the overlap piece and one of the folded pieces, and does not directly touch the food, but it is mistakenly opened after opening. Since the foreign matter may adhere to food, it is preferable to prevent such foreign matter from entering.

  Therefore, in the present invention, a means of providing a heat-sensitive second adhesive layer also on the outer surface of the overlap piece is employed. Then, as a packaged food and food packaging method using the packaging bag with the configuration, after the overlap piece and the other folded piece are bonded, the outer surface of the overlap piece is further bonded to the one folded piece I used the means. According to these means, since the overlap piece is bonded to one and the other folding pieces, the above-described gap is not formed, and foreign matters can be completely excluded. Here, the “outer surface of the overlap piece” means a surface opposite to the “inner surface” and may be expressed as “surface” in the present invention.

  When the overlap piece is bonded to one folded piece by the second adhesive layer, it is easy to increase the degree of pulling of the surplus film that is folded to the left and right sides, preferably by pulling the surplus film slightly downward. In this state, the overlap piece and the folded piece can be adhered to each other by the second adhesive layer by heating from above.

  As is clear here, the adhesion by the second adhesive layer depends on how the overlap piece is folded back flatly. Therefore, in the present invention, means for forming a folding guide line in advance at the boundary with the overlap piece is used for at least one folding piece extending the overlap piece. According to this means, the overlap piece can be folded more flatly along the folding guide line, and even if there is no support by the folding jig, the outer surface of the overlap piece can be moved to one side only by heating from above. It can be securely bonded to the folded piece. Further, it is more preferable to form a folding guide wire in advance for the other folded piece. This is because the other folding piece can be easily folded to the one folding piece side by the folding guide line, and therefore it is possible to prevent a relatively soft food such as a sandwich from being crushed when the other folding piece is folded.

  According to the present invention, since the adhesive portion of the overlap piece and the folding piece only overlap, the opening can be closed in a form that is substantially flat, and the left and right ears are fused and sealed, so that there is little The four sides of the opening can be completely sealed by the number of folding and the number of overlapping. In addition, since the left and right ears are folded outward, it does not crush the corners of the food in the shape of a triangle such as a sandwich during molding, and the bottom area of the packaged food increases, Even when a thin film is used, the independence can be improved.

  Further, the spatula-shaped folding jig firmly holds the adhesive portion with the folded piece as a receiving portion when the overlap piece is adhered to the pressurizer, so that the adhesive force is increased and the pressure of the pressurizer is increased. The food can be protected from heat for softening the heat-sensitive adhesive layer.

  Furthermore, a second adhesive layer is provided on the outer surface of the overlap piece so that the folded overlap piece is bonded to one of the folded pieces, so there is no gap between them, and foreign matter enters. Was completely eliminated.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a packaging bag according to the first embodiment of the present invention, and the two sides of the packaging film 1, 2 on the front and back sides are sealed on the short side upper base 3 and both sides 4, 5, The bag is formed in a substantially isosceles trapezoidal shape with only the bottom 6 on the long side opened. Folding pieces 7 and 8 that can close the opening are extended on the bottom of the films 1 and 2 on both the front and back sides. The folded piece 8 of the film 2 on one side (the back side in the drawing) is further folded at its edge to the opposite side, and the folded piece 7 of the other film 1 and an overlap piece 9 that can be polymerized with each other are extended. ing. Further, the inner surface of the folded piece 7 of the other film 1 is part-coated with a belt-like adhesive layer 10 having heat sensitivity or pressure sensitivity in the polymerization range with the overlap piece 9.

  FIG. 2 shows a first embodiment of the present invention relating to a packaged food in which a sandwich is packaged using the above packaging bag, and the opening of the packaging bag after the sandwich is inserted is folded over the overlap piece 9. The other film 1 is sealed by fusing and sealing the front and back overlapping portions of the surplus film 12 that is spread on both sides of the bonding portion 11 while being bonded to the folded piece 7 of the film 1. Therefore, the opening of the packaging bag can be completely sealed from all sides. In addition, since the melt film seal of the surplus film 12 has left and right ear portions 13 and 14 left and right, the bottom area is enlarged by the ear portions 13 and 14 and stable independence is obtained.

  Note that the adhesive layer 10 may have any heat-sensitive or pressure-sensitive adhesive performance, and the adhesive layer 10 may be provided on the polymerization inner surface of the overlap piece 9. However, in the case where the adhesive layer 10 has heat sensitivity, a material that is bonded at a lower temperature (for example, 100 ° C.) than the softening temperature (for example, 130 ° C.) of the packaging films 1 and 2 to be used is used. Moreover, although the well-known thing, such as a polypropylene (PP), can be employ | adopted for the raw material of the packaging films 1 and 2, adoption of thinner biaxially-stretched polypropylene (so-called OPP) makes it possible to improve the tensile strength and rigidity. It is preferable because of excellent mechanical properties, heat resistance, transparency, and barrier properties. Furthermore, the top bottom 3 of the bag and the seals of both sides 4 and 5 can also employ conventionally known means and have different lengths on the top and bottom 3 as shown in FIG. It is also possible to extend the flaps 15 and 16 and form a cut 17 in the longer flap 16.

  FIG. 3 shows a method of manufacturing the packaged food shown in FIG. 2 using the packaging bag shown in FIG. 1 in the order of steps. First, in the first step S1, the upper bottom 3 is set to the lower side. The food T having a triangular shape in a side view such as a sandwich is introduced into the packaging bag from the opening of the bottom 6, and in the second step S 2, the folded pieces 7 and 8 of both the front and back films are folded in the direction in which the opening is closed, that is, inward. At this time, the one folded piece 8 extending from the overlap piece 9 is folded inward with the spatula-shaped folding jig 18 along the surface thereof, and the overlap piece 9 with the tip as a base end. Is folded simultaneously with the folding of the other folding piece 7. Further, in the second step S2, when the folding pieces 7 and 8 are folded, the surplus film 12 is formed on both sides thereof, but the present invention does not fold it inward as in the prior art, but on the left and right sides. Fold it up.

  In the subsequent third step S3, a pressure / heater 19 is pressed against the overlap portion 9 of the overlap piece 9 folded by the folding jig 18 and the folded piece 7 of the other film 2 that is folded on the overlap piece 9. 9 is adhered. At this time, the folding jig 18 functions as a receiving portion of the pressurizing / heating machine 19 and firmly holds the overlap piece 9 and the folding piece 7 between the pressurizing / heating machine 19, and thus has a high adhesive force. And at the same time, the food T is protected from the pressure and heat of the pressurizing / heating machine 19. Even in this bonding step, the folded state of the excess film 12 on both sides is maintained.

  In the final fourth step S4, the surplus films 12 folded left and right in the second step S2 are fused and sealed to form a pair of left and right ears 13 and 14. The fusing seal in the fourth step S4 may be a two-stage process in which sealing and cutting are performed simultaneously in one process, or separately after sealing.

  FIG. 4 is a plan view showing a packaging bag according to the second embodiment of the present invention. Parts having the same configuration as those of the first embodiment are denoted by the same reference numerals. In particular, only the additional points will be described. In this second embodiment, (1) the outer surface of the overlap piece 9 has heat sensitivity. Two adhesive layers 20 are provided, and (2) a folding guide wire 21 is provided in advance at the boundary between the overlap piece 9 and the one folded piece 8. As in the first embodiment, the second adhesive layer 20 can be part-coated in a strip shape. The folding guide wire 21 can be formed on the molding line of the packaging bag using a molding roller that does not cut the film. In the present embodiment, the folding guide wire 21 is also formed in advance along the adhesive layer 10 on the other folding piece 7.

  Next, when the packaged food using this packaging bag is shown in FIG. 5, this packaged food is the other folding piece 7 and the Au lap piece 9 which comprises the adhesion part 11, and also the 2nd adhesive layer mentioned above. 20 is bonded to one folded piece 8. Therefore, there is no gap between the overlap piece 9 and the one folded piece 8 so that foreign matter enters. In addition, it is the same as that of 1st embodiment to comprise the ear | edge parts 13 * 14 formed by fusing and sealing an excess film on both right and left sides.

  Then, the manufacturing method (packaging method) of the packaged food shown in FIG. 5 will be described according to FIG. 6 using the packaging bag of FIG. In addition, the packaging method which concerns on 2nd embodiment is comprised by the same process to S1-S3 of 1st embodiment shown in FIG. 3, and final process S4 is also the same, and overlap piece 9 is set between S3 and S4. Since only step S5 for adhering to one folded piece 8 is added, only step S5 is shown in FIG. That is, in step S5, the jig 18 is used to weld the overlap portion 9 and the overlapped portion 7 of the other folded piece 7, and then the jig 18 is retracted and overheated by the heat from the heater 19. The second adhesive layer 20 provided on the outer surface of the wrap piece 9 is dissolved, and the outer surfaces of the overlap piece 9 and the one folded piece 8 are bonded to each other.

  At the time of this bonding, the excess film 12 on both sides is pulled to the left and right so that the overlap piece 9 is folded back so as to be in close contact with the one folding piece 8, so that both 9 and 8 are securely bonded. Can do. Here, since the folding guide wire 21 is formed in advance between the overlap piece 9 and the one folding piece 8, the overlap piece 9 can be more easily folded flat. More preferably, the overlap piece 9 can be folded back so as to be more closely attached to the one folded piece 8 by pulling the excess films 12 and 12 slightly downward. In the present embodiment, since the folding guide wire 21 is also formed on the other folding piece 7, the folding piece 7 is moved to the one folding piece 8 side without deforming the food to be packaged (sandwich or the like). Can be folded flat.

  After the overlap piece 9 is bonded to one folded piece 8 in this way, as described above, the surplus films 12 and 12 are fused and sealed in accordance with S4 of FIG. 13 is formed.

  In addition, the packaging of food is completed by the process so far, but as a final process before shipping as a product, the raw material / expiration date related to the food on any surface of the packaging bag, such as the opening surface after the closure mentioned above It is also possible to attach a label on which information such as this is printed.

The top view which showed 1st embodiment of the packaging bag of this invention The perspective view which showed 1st embodiment of the packaged food of this invention by the said packaging bag Process drawing which shows 1st embodiment of the packaging method of this invention The top view which showed 2nd embodiment of the packaging bag of this invention The perspective view which showed 2nd embodiment of the packaged food of this invention by the said packaging bag. Explanatory drawing which shows only the additional process from 1st embodiment among the packaging methods which concern on 2nd embodiment of this invention.

Explanation of symbols

1.2 Film for packaging 7 and 8 Folded piece 9 Overlap piece 10 Adhesive layer 12 Excess film 13 and 14 Ear part 18 Spatial folding jig 19 Pressurizing and heating machine 20 Second adhesive layer 21 Folding induction wire

Claims (9)

Two packaging films are formed into a substantially isosceles trapezoidal shape with an opening on the bottom side, and a folding piece is formed on each bottom side of the film so as to be able to close the opening. The piece further has its edge folded back to the opposite side, and the other folded piece and the inner surface are overlapped to overlap each other, and at least one of the overlapping piece or the other folded piece is superposed. A packaging bag comprising an inner surface provided with an adhesive layer having heat sensitivity or pressure sensitivity. The packaging bag of Claim 1 which provided the 2nd contact bonding layer which has heat sensitivity also in the outer surface of the overlap piece. The packaging bag according to claim 1 or 2, wherein a folding guide wire is previously formed on the folded piece. A packaged food product in which the opening of the packaging bag according to claim 1 is filled with a food product having a triangular shape in side view such as a sandwich, and the overlapping piece of the packaging bag is folded back and adhered to the other folded piece. A packaged food characterized in that a pair of left and right ears are formed by fusing and sealing the superposed portions of the surplus film folded on both outer sides of the adhesive part. 4. A packaged food in which the opening of the packaging bag according to claim 2 or 3 into which a food product having a triangular shape in a side view, such as a sandwich, is charged, is folded over and overlaps with the other folded piece. In addition, the outer surface of the overlap piece is bonded to one folded piece, and a pair of left and right ears is formed by fusing and sealing the overlapped portion of the surplus film folded on both outer sides of the bonded portion. Prepackaged food. A food product having a triangular shape in side view, such as a sandwich, is placed in the packaging bag according to claim 1, and the folded pieces of the packaging bag are folded in a state where the surplus films formed on both outer sides thereof are folded left and right. A method for packaging food, wherein the overlap piece is folded back and bonded to the other folded piece, and then the superposed portion of the surplus film folded left and right is fused and sealed. A food product having a triangular shape such as a sandwich is put into the packaging bag according to claim 2 or 3, and the folded pieces of the packaging bag are folded in a state where the surplus films formed on both outer sides thereof are folded left and right. In addition, the overlap piece is folded and bonded to the other folding piece, and in this state, after the outer surface of the overlap piece is bonded to the one folding piece, the overlapping portion of the surplus film that is folded left and right is A food packaging method characterized by fusing and sealing. A folding tool having a spatula-like tip is placed along the surface of one folding piece, the overlapping piece is folded with the leading end as a base end, and the other folding piece is used as a receiving portion with the other folding piece as the overlapping piece. The food packaging method according to claim 6 or 7, wherein the food is pressed in such a manner that it can be adhered. The food packaging method according to claim 8, wherein the spatula tip of the folding jig is a heat-resistant conductive material.

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