JP2011235968A - Easily openable packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag which is easily and surely opened even when a content is easily damaged and which allows the content to be easily separated from a film even when they are tightly adhered to each other.SOLUTION: An easily openable packaging bag is a gassete type packaging bag comprising a laminated film having a substrate layer and a thermally adhesive resin layer. The easily openable packaging bag includes: a side face part formed into a roughly axially-symmetric deformed hexagonal cylinder shape in which two sides opposite to each other with the thermally adhesive resin layer therebetween are folded inward; and an end in which one of both ends of the deformed hexagonal cylinder is sealed by thermal adhesion. Two sides along the axial direction included in at least one surface of six surfaces constituting the side face part are bonded to the sides of the other surfaces by thermal adhesion between the thermally adhesive resin layers. A picking piece for opening is disposed in the end of the one surface. At the end, the thermally adhered parts extending from the two sides in the axis direction include at least one reverse-V shape converging toward the leading edge of the end. and the thermally adhered parts are easily openable.

Description

  The present invention relates to a packaging bag made of a plastic film and suitable for packaging three-dimensional contents, and more particularly, to a packaging bag having an easy-opening property capable of easily opening a package with fingers.

  A plastic package is used as a typical packaging material, and the package is sealed with the contents stored in a packaging bag. The contents are contained in a bag-shaped product made of packaging materials according to the shape and size of the contents. The both ends of the cylindrical object are housed and hermetically sealed.

  Such packaging bags are known in various shapes, but it is troublesome to use a tool such as scissors when opening. However, when the film is cut with fingers, the contents may fall down due to the reaction of the cut. In addition, if the contents are fragile confectionery such as castella, or if it is a whole package of processed marine products, the contents may be damaged when opened, Sometimes it was difficult to remove from the packaging bag.

  In particular, the gusset-type packaging bag is a packaging bag that uses a plastic film as a typical packaging material and can be packaged beautifully according to the shape of a three-dimensional content such as a box or Japanese confectionery. A sealed package containing the contents stored in a gusset-type packaging bag is stored in a cylindrical object made of packaging material in accordance with the shape and size of the contents, and both ends of the cylindrical object. A part is partially folded and hermetically sealed.

  Such a gusset-type package is relatively difficult to open, and the folded seal portion tends to become resistance during opening. Therefore, the part between the fold seal part and the contents is cut using a tool such as scissors, or the fold seal part is cut and the film is torn from the cut with fingers. It was normal.

  In addition, in the case of a gel-like material that has been cooled and solidified after filling the packaging bag with a fluid such as sheep, since the film and the contents are in close contact with each other, It sometimes took time to separate the contents. The same thing has been pointed out, as in Castella, in which an oxygen absorbent is enclosed together during filling, so that the inside of the package is depressurized and the packaging bag and the contents are in close contact with each other. Therefore, there has been a demand for a packaging bag that can maintain the sealed state of the contents of the package, can be easily opened with fingers, and can easily separate the contents and the packaging bag.

  As an easy-opening technique for a gusset-type packaging bag, a bag-like container provided with gusset folds folded into V-shapes on both the left and right sides of a cylindrical film provided with a vertical seal portion, and filled with at least the contents In the gusset bag-like container in which a rectangular cylindrical side portion and a flat rectangular bottom portion are formed, an unsealed portion is provided in a partial region on the film outer end side of the vertical seal portion, and the upper film of the unsealed portion A gazette-type packaging bag in which an opening for cutting in a direction orthogonal to the vertical seal portion is cut at the outer end edge is disclosed (for example, see Patent Document 1). However, since the direction in which the film is torn and the level of force required for tearing is unstable, the contents may fall down or be damaged due to unexpected opening. Furthermore, the problem of the adhesion between the packaging bag and the contents has not been solved.

JP 2002-104439 A

  The present invention can be opened easily and reliably even if the contents are fragile, and the contents and the film can be opened even in a package in which the contents and the film are in close contact, such as sheep and castella. It is an object to provide an easy-open packaging bag that can be easily separated.

  The present invention is composed of a laminated film having a base material layer and a heat-adhesive resin layer, and has a substantially axisymmetric deformed hexagonal cylinder shape in which two opposite sides are folded inward with the heat-adhesive resin layer inside. A gusset-type packaging bag having a side surface portion and an end portion in which one of both ends of the deformed hexagonal cylinder is sealed by thermal bonding, and is included in at least one of the six surfaces constituting the side surface portion Two sides along the axial direction are joined to sides of the other surface by thermal bonding, and an opening knob is provided at the end portion of the one surface, and the end portion extends along the axial direction. The thermal bonding portion extended from the two sides includes at least one inverted V shape that converges toward the distal end direction of the end portion, and the thermal bonding portion is easily openable. It is a packaging bag.

  Here, it is preferable that the opening tab is provided along the inverted V-shaped thermal bonding portion. Moreover, it is preferable that the seal strength of the thermal bonding portion is 2N / 15 mm width or more and 20 N / 15 mm width or less. Moreover, it is preferable that the said one surface was comprised with the easily peelable film. Moreover, it is preferable that a film separate from the laminated film is inserted as the opening tab. The gusset-type packaging bag is a four-corner seal gusset-type packaging bag in which the four sides in the axial direction excluding the two opposite sides of the deformed hexagonal shape are joined by thermal bonding, and the four-sided thermal bonding portion The thermal bonding portions of the end portions extended from the sides converge toward the axis of the hexagonal cylinder and intersect with each other to form inverted V-shapes, and at least adjacent among the thermal bonding portions of the four sides It is preferable that the sealing strength of the two sides is 2N / 15 mm width or more and 20 N / 15 mm width or less. Moreover, it is preferable that the seal | sticker intensity | strength of the remaining two sides is 20 N / 15mm width or more among the four sides of the heat-bonded portions. Moreover, it is preferable that other surfaces except the said one surface are comprised from the said one laminated film.

  Even if the contents are fragile, they can be opened easily and reliably without damaging the contents, especially in gazette-type packaging where the contents and the film are in close contact, such as sheep and castella. However, an easily openable packaging bag in which the contents and the film can be easily separated is obtained. Opening is particularly smooth.

It is the (a) front view, (b) right view, (c) perspective view, (d) perspective view which showed the structural example of the gusset type packaging bag. It is sectional drawing of (a) AA 'which showed the layer structure and arrangement | positioning direction of the laminated | multilayer film of a gusset type packaging bag, (b) It is an enlarged view of B part. (A) It is sectional drawing which showed one example in which the opening start film was inserted in the peeling start part, (b) It is sectional drawing which showed the other example. It is the figure which enumerated the other structural example of the gusset type packaging bag. It is the (a) front view, (b) right view, (c) perspective view, (d) perspective view which showed the structural example of the package. It is a figure explaining the opening state of a package. It is (a) front view and (b) perspective view which showed the example of a structure of the flat bag type packaging bag. It is the (a) front view and (b) perspective view which showed the other structural example of the flat bag type packaging bag.

Embodiments of the present invention will be specifically described with reference to the drawings. First, a gusset type packaging bag will be described as an example. FIG. 1 is a schematic diagram showing a schematic configuration of a gusset type packaging bag.
1 (a) is a front view of the packaging bag 1, FIG. 1 (b) is a right side view of the same packaging bag, and FIG. 1 (c) shows the packaging bag 1 from the direction of the end portion 42 that is not sealed. FIG. 1D is a perspective view of the packaging bag 1 viewed from the sealed end 41 direction. In FIG. 1, the heat-bonded portion is represented by diagonal lines. The same applies to FIGS.

  The packaging bag 1 includes a side surface portion 40 that forms a cylindrical space for storing contents, and end portions 41 and 42 that are positioned at both ends in the axial direction of the cylinder of the side surface portion 40 and are sealed by thermal bonding. . In the example shown in FIG. 1 (a), one end 41 is thermally bonded and sealed, while the other end 42 remains open to fill the contents. After the end portion 42 is filled with the contents, it is thermally bonded and sealed. The side surface portion 40 constitutes a hexagonal cylinder composed of six side surfaces 2 to 7 that are sequentially connected to each other with six sides 10 to 15 substantially parallel to the axial direction, and two opposite sides 14 of these six sides. , 15 is a fold line, and the side surfaces 4 to 7 have a deformed hexagonal cylinder shape that is folded inside the hexagonal cylinder. Here, the axial direction means a parallel direction with respect to the symmetry axis of the packaging bag 1 that is generally symmetrical about the axis, as indicated by an arrow in FIG.

  The packaging bag is stored in a state in which the side surface portions 4 to 7 including the folds 14 and 15 are folded into a fold until the contents are filled. When the contents are filled from the opening 43, the folded state between the side surfaces 4 and 5 and the side surfaces 6 and 7 disappears, and each of them is transformed into one plane. Thus, the side surface portion 40 is deformed from a substantially hexagonal cylinder shape to a substantially square tube shape. The contents are filled inside the rectangular tube shape. Such a packaging bag is called a gusset type packaging bag.

  In the example shown in FIG. 1, the six side surfaces 2 to 7 constituting the side surface portion 40 include side surfaces 2 and 6, side surfaces 7 and 3, and side surfaces 3 and 5. The belt-like heat-bonding portions 20 to 23 (hereinafter also referred to as “side seals”) along the lines 10 to 13 are heat-bonded and joined to each other. Further, the side surfaces 4 and 5 and the side surfaces 6 and 7 are joined to the other side surfaces in a state in which one film is folded in two at the sides 14 and 15 in the axial direction. Such a packaging bag 1 uses a laminated film having a base material layer and a heat-adhesive resin layer, and the heat-adhesive resin layer is on the inside of the packaging bag so as to be cut, folded, heat-bonded or the like. It can be created by processing.

  The end portion 41 of the packaging bag 1 is a portion that becomes a starting point of opening when the packaging body in which the contents are sealed in the packaging bag 1 is opened with fingers. As shown in FIG. 1A, the end portion 41 is a diagonal line forming an acute angle R with respect to the end sides 10, 12, etc. of the side surface portion 40, and converges toward the symmetry axis of the hexagonal cylinder. , 25. The thermal bonding portions 24 and 25 intersect with each other at a point 28 on the extension line to form one inverted V-shape. The thermal bonding portions 24 and 25 are band-shaped thermal bonding portions that are continuous from the side seals 20 to 23. Hereinafter, these may be referred to as “end seals”. Thus, by making it an inverted V shape, the force applied in the case of opening can be utilized efficiently. That is, since the force concentrates on the point 28 where the heat-bonding portions intersect at the time of opening, the opening can be started with a relatively small tearing force. On the other hand, it is difficult to waste the packaging bag material.

  Here, the range of the acute angle R is preferably 20 ° or more and 60 ° or less, more preferably 30 ° or more and 50 ° or less, and further preferably 45 °. Further, the seal widths of the side seals 20 to 23 and the end seals 24 to 27 are each preferably 2 mm or more and 20 mm or less, more preferably 3 mm or more and 15 mm or less, and further preferably 3 mm or more and 10 mm or less. . This makes it easier to achieve easy opening while maintaining the necessary sealing properties.

  The peeling start parts 30 and 39 used as the picking piece at the time of opening a package body with fingers are provided along the outer periphery of the reverse V-shaped thermobonding parts 24 and 25 of the edge part 41. As shown in FIG. The peeling start part 30 is provided at the tip on the axis of symmetry, and this part is mainly the knob end. Further, the peeling start portion 39 converges toward the symmetry axis at an angle smaller than the angle R with respect to the edges 10 and 12 of the side surface portion 40, and fingers are moved along the thermal bonding portions 24 and 25. A substantially trapezoidal pick end that can be picked is formed. By having this part, it becomes easier to find the end of the knob when opening, and it becomes easier to pick. In FIG. 1, the peeling start portion 39 connects the end points of the end sides 14 and 15 folded inside the deformed hexagonal cylinder and the end points of the outer end sides 10 and 12 with a single oblique line. However, it may be connected by a plurality of straight lines, or a curved line may be used. In short, the outer peripheral part of the peeling start part 39 should just become a free end, and can be picked with a finger.

  In such peeling start portions 30 and 39, the films of the side surface 2 and the side surface 3 are respectively extended in the axial direction, and the inverted V-shaped portions 24, 25 and 28 are thermally bonded on the front and back, and the other portions are It is in the state of a free end that is not thermally bonded but remains separated. Opening of the package is started by picking each of the front and back portions (for example, 35) of the peeling start portions 30 and 39 with fingers of both hands and pulling them left and right.

  Here, the size of the peeling start portion 30 is such that the width of the tip portion perpendicular to the axial direction is 5 mm or more and the length along the axial direction from the point 28 is 5 mm or more toward FIG. It is preferable that the width is 7 mm or more and the length is 7 mm or more, and more preferably the width is 10 mm or more and the length is 10 mm or more. The upper limit is not particularly defined, but it is natural that it does not exceed the size of the packaging bag, and may be a common sense size suitable for opening with fingers.

  Among the heat-bonded portions of the packaging bag 1, a continuous belt-shaped heat-bonded portion composed of the intersection 28, the end seals 24 and 25, and the side seals 20 and 21 is sealed with a relatively low sealing strength that is easy to open. Has been. In this case, the side surface 2 is peeled off from the package at the time of opening. Such seal strength is preferably 2 N / 15 mm width or more and 20 N / 15 mm width or less. When the seal strength is 2 N / 15 mm width or more, the strength required for a packaging bag can be ensured, and bag breakage is unlikely to occur during filling of the contents, transportation after packaging, and storage. Further, the seal strength is 20 N / 15 mm width or less, and it becomes possible to peel off the heat-bonded portion with the finger when opening. A more preferable range of the seal strength is 2N / 15 mm width or more and 17 N / 15 mm width or less, and preferably 3 N / 15 mm width or more and 15 N / 15 mm width or less.

  On the other hand, the band-like heat-bonded portion formed by the end seals 26 and 27 and the side seals 22 and 23 that are the outer edges of the side surface 3 opposite to the side surface 2 does not need to be peeled off when opened. However, it may be peeled off. Therefore, the seal strength of the end seals 26 and 27 and the side seals 22 and 23 may be within the range of easy opening or may be stronger. If the seal strength of this part is 20 N / 15 mm width or more, a seal part that does not need to be peeled off at the time of opening becomes difficult to peel off, which is preferable. In place of the side surface 2, the side surface 3 may be peeled off, or the side surfaces 6 and 7 or the side surfaces 4 and 5 may be peeled off. Furthermore, all the side surfaces may be peeled off.

  FIG. 2 is a diagram illustrating the layer configuration of the laminated film and the arrangement direction of the front and back of the film when the packaging bag 1 is created. Fig.2 (a) is AA 'sectional drawing of the packaging bag 1 in Fig.1 (a). FIG. 2B is an enlarged view of a portion surrounded by a circle B in FIG. 2A, and shows a state where the side surface 5 and the side surface 3 are bonded by the heat bonding portion 22. The composite film to be the side surface 5 is composed of the base material layer 44 and the heat adhesive resin layer 45, and the composite film to be the side surface 3 is composed of the base material layer 46 and the heat adhesive resin layer 47. The composite film on the side surface 5 and the composite film on the side surface 3 are arranged so that the respective heat-adhesive resin layers are in contact with each other, that is, the heat-adhesive resin layer is inside the packaging bag 1. The films on the side surfaces constituting the side surface portion may be different from each other, but using the same film is preferable because the manufacture of the packaging bag 1 is simplified.

  The base layer of the laminated film is a layer having strength and other functions, and in terms of strength, it is generally a stretched film made of polypropylene (hereinafter referred to as PP) (hereinafter referred to as OPP), nylon resin such as nylon 6, nylon 66 and nylon 12. A biaxially stretched film of a polyester resin such as a stretched film (hereinafter referred to as Ny) (hereinafter referred to as ONy), polyethylene terephthalate (hereinafter referred to as PET), or polybutylene terephthalate is preferably used. Moreover, films other than these can also be used as needed.

As another function of the base material layer, for example, it is preferable to provide gas barrier properties, particularly oxygen barrier properties. As a method for imparting barrier properties, for example, a film obtained by coating the surface of the OPP, ONy, or PET film with a layer having a barrier property such as polyvinylidene chloride (hereinafter, PVDC), polyvinyl alcohol (hereinafter, PVA), or organosiloxane is used. be able to. Also, a film in which aluminum (hereinafter referred to as Al) is vapor-deposited on the surface of the OPP, ONy, PET film, or a film in which an inorganic oxide such as aluminum oxide or silicon oxide is vapor-deposited on the surface of the ONy, PET film can be used. Further, a film obtained by laminating and stretching PP and ethylene-vinyl alcohol copolymer resin (hereinafter EVOH) instead of OPP, or a film obtained by laminating and stretching Ny and metaxylene adipamide resin instead of ONy, A film obtained by laminating and stretching Ny and EVOH can be used. In addition, the OPP, ONy, and PET films can be laminated with films having gas barrier properties such as PVDC films, EVOH films, and Al foils. May be laminated. Moreover, in order to promote consumers' willingness to purchase or to display information on the packaged food, printing may be performed on a part of the base material layer such as the OPP, ONy, or PET film described above.

  The heat-adhesive resin layer of the laminated film can use a heat-sealable thermoplastic resin, and is generally low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene resin, ethylene- A vinyl acetate copolymer, an ethylene-acrylic acid copolymer, an ethylene-acrylic acid ester copolymer, and the like can be used. These general heat-sealable resins have a relatively strong seal strength under the original heat-sealing conditions, so the conditions such as heat-sealing temperature, pressure, and time can be used to control the above-mentioned easy-opening seal strength. It is important to control precisely.

  It is preferable from the viewpoint of control of the sealing strength that the heat-adhesive resin layer is made of an easily peelable film. Examples of easily peelable films include those produced by weakening the strength of the resin layer such as TAF-650C manufactured by Tosero Co., Ltd. or SMX-Y03 manufactured by J Film Co., Ltd., and DIFAREN manufactured by Dainippon Ink & Chemicals, Inc. -E3700T is a laminate structure in which the interlayer adhesive strength is weakened and delamination is performed at the time of peeling. The heat-adhesive resin layer comprises a layer (A) mainly composed of a high melting point resin having a melting point of 135 ° C. to 180 ° C., and a mixed resin of a low melting point resin and a high melting point resin having a melting point of 80 ° C. to 135 ° C. And the difference between the melting point of the high melting point resin of the layer (A) and the highest melting point of the low melting point resin of the layer (B) is 20 ° C. or more. You may use the film laminated | stacked in order of (B) and a layer (A). In this case, if the thermal bonding temperature is lower than the melting point of the high melting point resin, it becomes easy to open, and if it is high, it becomes difficult to open. In any case, it may be appropriately selected according to the suitability for the contents.

  It is preferable that another film for facilitating the start of opening is inserted at the position of the intersection point 28 of the sealed end 41 of the packaging bag 1. FIG. 3 is a cross-sectional view showing such an example. First, FIG. 3A is a cross-sectional view showing an example in which a film 48 for starting opening is inserted between the peeling start portions 30 and 35 on the front and back sides. The opening start film 48 is bonded to the peeling start portion connected to the film on the side peeled off at the time of opening, of the front and back peeling start portions 30 and 35. For example, in the case where the side surface 2 is the side surface to be opened, the side surface 2 is bonded to the thermal adhesive resin layer 32 of the peeling start portion 30 connected to the side surface 2 by the bonding surface 33. By providing such an opening start film, the opening method is easier to understand and easier.

  The opening start film 48 needs to be strong enough to withstand the pulling at the start of opening, and an OPP, ONy, PET film or the like is preferably used. Adhesion between the opening start film 48 and the laminated film may be performed by thermal bonding between the thermal adhesive resin layer of the laminated film and the opening starting film 48, or an adhesive or a pressure-sensitive adhesive may be interposed therebetween. In order for the opening start film 48 to heat seal with the laminated film, the base layer composed of the OPP, ONy, PET film, etc., and low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene series A film obtained by laminating a heat bonding resin layer made of a resin, an ethylene-vinyl acetate copolymer, an ethylene-acrylic acid copolymer, an ethylene-acrylic acid ester copolymer, or the like is preferable. The size of the opening start film 48 may be the same as that of the peeling start portions 30 and 35, or may be large, and the width may be narrow and the length may be long. The opening start film 48 is preferably colored for easy discrimination.

  FIG. 3B is a cross-sectional view showing another example in which an opening start film 49 is inserted between the peeling start portions 30 and 35 on the front and back of the packaging bag 1. The opening start film 49 is different from the opening start film 48 in that the opening start film 49 is sandwiched between the front and back peeling start portions 30 and 35 at the intersection 28. The unsealing start film 49 may be inserted partway through the heat bonding part, or the tip 52 may reach the inside of the packaging bag 1 beyond the heat bonding part. The opening start film 49 and the laminated film may be overlapped and may not be bonded, or may be bonded to the laminated film to be peeled off at the time of opening. The size of the opening start film 49 may be the same as or smaller than the width of the heat-bonding portion, and the size of the other portions is arbitrary as long as it is effective and can be used. It is. The material of the opening start film 49 can be the same as that of the opening start film 48 except for the above-described differences.

  FIG. 4 shows an example of another type of gusset type packaging bag other than the so-called four-corner sealed gusset type packaging bag 1 described in FIGS. 1 and 2. FIG. 4A is a view of the four-corner seal gusset-type packaging bag 1 as viewed from the side of the opening 43 along the axis of symmetry for comparison. Hereinafter, it is the figure seen from the same direction to (b)-(d). As described above, the four-corner seal gazette-type packaging bag 1 of (a) has the side surfaces 2 and 3 and the side surfaces folded inwardly at the folding lines 14 and 15 joined together at the heat-bonding portions 20 to 23. Has been. The lateral width of the side surface 2 and the lateral width of the side surface 3 are the same. In such a configuration, when the thermal bonding portion 20 is thermally bonded, it is efficient to thermally bond the thermal bonding portion 22 at the same time. Therefore, if the heat bonding part is made easy to open, it is easy to make the other heat bonding parts 22 easy to open.

  4B is the same four-corner seal gazette packaging bag, but the width of the other side surface 51 is larger than the width of one side surface 50, and the heat-bonding portions 72 and 73 of the side surface 51 are The point which protrudes on the outer side of the heat bonding parts 70 and 71 differs. In such a configuration, the seal strength can be easily used properly such that the heat-bonded portion of the side surface 50 is easily opened and the heat-bonded portion of the side surface 51 is difficult to open.

  FIG. 4C shows an example in which the side surface 80 is joined to the other side surface by the heat bonding portions 95 and 96, but the other side surfaces 81 to 85 are formed by bending one film. In this case, in order to bend the sides 92 and 93 reliably, it is preferable to provide the thermal bonding portions 97 and 98, but it is not necessary to perform the thermal bonding simply by bending. The configuration (c) is preferable because a portion that does not need to be peeled off at the time of opening is not peeled off. In addition, if the two side seals 95 and 96 are placed at the bottom after display after the package is configured, the side seals can be hidden so that the contents and the printed packaging can be seen well. The display effect can be further increased.

  FIG. 4 (d) shows an example in which the side bag 80 and the other side film are prepared separately and then thermally bonded, instead of the single side film, when the packaging bag of FIG. 4 (c) is prepared. is there. One film is bent at three bent portions including the bent portion 94 to form a deformed hexagon and the like, and the heat bonding portion 95 of the palm end 90 is heat bonded. At that time, the bent portion 94 is bent so as to protrude outward from the side 93. Each of the three bent portions is thermally bonded to ensure that the bending occurs. Finally, the bent portion 94 is cut along the cutting line 99 to obtain the same packaging bag as (c).

  Such a packaging bag may be formed by sequentially cutting, folding and thermally bonding the film in accordance with a conventional method for producing a gusset type packaging bag. As shown in FIG. 1, the end 41 serving as the unsealing end is cut according to the outer peripheral shape of the peeling start portions 30 and 39 using an appropriate mold blade as necessary, and sandwiching the unsealing start film as necessary. What is necessary is just to heat-bond so that it may become a shape.

  FIG. 5 is a diagram showing a schematic configuration of the package 100 in which the opening 43 is sealed by thermal bonding after the contents 101 are put into the gusset-type packaging bag 1 of FIG. 1 from the opening 43. (A) is a front view, (b) is a right side view, (c) is a perspective view seen from the side where the peeling start portion is provided, and (d) is provided with a peeling start portion. It is the perspective view seen from the side which is not.

  Similar to the packaging bag 1, the packaging body 100 includes an end portion 41 that is an opening start end, and an end portion 42 that is sealed by thermal bonding with the side surface portion 40. The side surface portion 40 is deformed from the deformed hexagonal cylinder shape to the square cylinder shape by filling the contents. This is because the side surfaces 4 and 5, 6 and 7 which were folded in the packaging bag 1 are all formed into one plane 110 and 111 by extending the folds 14 and 15, respectively. A three-dimensional content 101 is filled inside the rectangular tube.

The end portion 41 serving as the unsealed end of the package 100 has a substantially roofed roof shape formed by a combination of four substantially isosceles triangular surfaces 120, 122, 121, and 123, and the ridgeline thereof is in a thermally bonded state. ing. Moreover, the peeling start part 30 is located in the top part of the near building roof shape, and the peeling start part 39 is provided along each ridgeline of the near building roof shape. By setting it as such a shape, opening of the package 100 becomes easy. Moreover, even when the film and the contents are in close contact with each other, the contents after opening can be easily taken out. What is important here is that the heat-bonded portion forms the shape of the ridgeline of the dormitory roof and intersects in an inverted V shape at the intersection 28. Moreover, it is preferable to provide the peeling start part 39 which can become a knob end along a heat bonding part. As illustrated in FIG. 5, the peeling start portion 39 may be cut along the ridge roof shape, or may have a different form. As illustrated in the figure, it is desirable to cut along the roof shape of the building from the viewpoint of preventing unexpected bag breakage and aesthetics.

  The other end portion 42 of the package 100 need not be an open end, but may be an open end. In FIG. 5, the end film is folded at a folding line 103 to be a sealed end sealed with a band-shaped thermal bonding portion 102 provided in a direction perpendicular to the axial direction. The end 42 may be sealed by a conventionally known method. For example, the end 42 may be formed into a quadrangle by being folded and thermally bonded to the film. In addition, it is good also as an opening end similarly to the edge part 41. FIG.

  It goes without saying that not only the packaging bag 1 but also various easy-opening gusset type packaging bags as illustrated in FIG. 4 may be used to configure the package 100.

  FIG. 6 is a diagram illustrating an operation when opening the package 100. (A) is the perspective view which showed the state before starting opening, (b) is the perspective view which showed the state in the middle of opening. Opening is performed as follows. First, the opening and closing tabs 30 and 35 on the front and back which are peeling start portions not bonded to each other are picked with fingers of both hands, and 35 is pulled in the D direction and 30 is pulled in the C direction. Then, the force from the fingers is applied to the intersection point 28 at the top of the dormitory roof shape via the knob 30 and this portion is peeled off. Subsequently, a force is applied to the thermal bonding portions 24 and 25 forming the ridgeline of the dormitory roof in the directions of arrows E and F, and peeling is continued. At that time, the arrows E and F form an acute angle based on the angle R with respect to the peeling start portion 30. Therefore, the peeling force applied to the peeling start portion 30 is applied to the thermal bonding portions 24 and 25 almost as they are, and can be easily peeled with fingers.

If the peeling is further continued, all of the thermal bonding parts 24 and 25 are peeled off, and then the side seals 20 and 21 continuous to the thermal bonding parts 24 and 25 are pulled by pulling in the direction of arrow G in (b). Peel off sequentially. In this way, the side surface 2 is peeled off in a planar shape from the package 100, and thus is opened. Since the opening is performed in a sheet form, the opening for taking out the contents is also in a sheet form, and the contents can be easily taken out. Moreover, even if the contents are such that the film and the contents are in close contact with each other, the contents and the film can be easily separated because they are opened in a sheet shape when opened.

  Such a package can be opened stably without causing an unexpected failure, as compared to a package that is cut and opened in a conventional linear fashion. The force required for opening is small, and smooth opening can be realized. In addition, since the contents and printing do not become difficult to see, the display effect is also excellent. Furthermore, even if the contents are fragile like a short cake, they can be easily opened without breaking the contents. Furthermore, the film and the contents can be easily separated even in a package body in which the contents and the film are in close contact, such as canola and castella.

  The packaging bag is not limited to the above gusset type, and may be another type. FIG. 7 is a view showing an example of a flat bag-type packaging bag 200 that becomes a four-side sealed package during packaging. FIG. 7A is a front view, and FIG. 7B is a perspective view. From the substantially trapezoidal opening knob 220 having two diagonal lines 221 and 223 inclined at an angle smaller than the acute angle R with respect to the axial direction, and the heat bonding portions 230 and 231 of the side surface portion 210 for storing the contents. The structure of the thermal bonding portions 232 to 234 that converges into one inverted V shape toward the end tip 222 is the same as the thermal bonding portion of the gusset type packaging bag 1 described above. Similarly, after the contents are filled from the opening 212 of the lower end 211, the lower end 211 is heat-sealed and sealed. Even such a flat bag-type packaging bag can be easily opened as in the case of the gusset type.

  Moreover, FIG. 8 is the figure which showed the other example of the flat bag type packaging bag used as the package body of a four-side seal at the time of packaging. FIG. 8A is a front view and FIG. 8B is a perspective view. In this example, the number of the reverse V-shape is not one, but two reverse V-shapes are arranged in the direction substantially perpendicular to the axial direction from the heat-bonding portions 332 to 336 to constitute the heat-bonding portion. As a result, the two apexes 333 and 335 of the inverted V shape are aligned, and the thermal bonding portion is an inverted W shape. Even in this case, at the time of opening, one of the two inverted V-shaped vertices becomes the opening end, so that the package can be easily opened as in the case of one inverted V-shaped. Furthermore, by doing in this way, the length of the axial direction required in order to provide a heat bonding part in the opening edge part becomes short, and it becomes possible to make a packaging bag more compact.

  As described above, the number of the inverted V-shapes arranged on the thermal bonding portion of the opening end is not limited to one or two, but three or more are arranged so as to be substantially perpendicular to the axial direction. Also good. In addition, when arranging a plurality, the whole may be handled equally and arranged in a single line, or the inverted V-shaped apex located near the center in the direction substantially perpendicular to the axial direction is located closer to the end. Alternatively, the inverted V-shaped apex located near both ends in a substantially right-angle direction may be positioned farther from the end. In order to have such a plurality of inverted V-shaped thermal bonding portions, regardless of the form of the packaging bag, a flat bag type, a gusset type of four-side seals, and other types are also adopted. be able to. By doing so, the force concentrates on the inverted V-shape located near the center at the time of opening, so that the opening becomes easy and the packaging bag can be made compact.

  Hereinafter, the present invention will be described based on examples. The thermal bond strength was evaluated as follows. First of all, the test pieces were joined to the heat bonding surfaces of two films, one end of which was a heat seal tester TP-701S manufactured by Tester Sangyo Co., Ltd., with a heat bonding time of 1 second, a heat bonding pressure of 98 kPa, and a heat bonding temperature of 180. A test piece was prepared at 0 ° C. The thermal bond strength was measured according to JIS-Z1707 in an environment of 23 ° C. and 50% relative humidity. However, the test speed was 300 ± 30 mm per minute. A plurality of test pieces were measured for each of the film flow direction (MD) and the width direction (TD) and averaged.

  An easily peelable film with a thickness of 50μ (trade name, manufactured by J-Film Co., Ltd.) having a base layer made of a biaxially stretched film of Ny with a thickness of 15μ and metaxylene adipamide resin (trade name Empron M200, manufactured by Unitika Ltd.) SMX-Y03) was used as a heat-adhesive resin layer, and the two films were bonded together with a 2 μm-thick polyurethane-based two-component curable adhesive to form a laminated film constituting a packaging bag.

  This was made into a gusseted packaging bag with a fold as shown in FIG. 1 with the heat-adhesive resin layer inside. The width of the bag is 60 mm, the width of the fold is 20 mm, the total length of the bag is 340 mm, the seal width of the thermal bonding portion is 3 mm, the width of the peeling start portions 30 and 39 is 20 mm, the length from the intersection 28 is 15 mm, and the diagonal direction The end seal angle R was 45 °. The seal strength of each seal part was 6 N / 15 mm width.

  Next, castella of width 50mm, height 30mm, length 200mm is put in the above packaging bag, oxygen absorbent (Mitsubishi Gas Chemical Co., Ltd., trade name Ageless) is put, and the open end is wide. Thermal sealing was performed with a 7 mm linear seal to obtain a sealed package as shown in FIG. Seven days after sealing, when the package was observed, it was in a depressurized state due to absorption of oxygen therein, and the film of the supporting bag was in close contact with the castella. When the peeling start portions 30 and 35 were peeled off and the end seals 28 and 25 and the side seals 20 and 21 were peeled in this order, the package was easily opened. The shape of the castella did not collapse.

  A packaging bag in the same manner as in Example 1 except that a film obtained by depositing aluminum oxide on a biaxially stretched polyester film having a thickness of 12 μm (trade name Pariarox 1011HG, manufactured by Toyo Metallizing Co., Ltd.) was used as the base layer of the laminated film. Got. The seal strength of each seal part was 6 N / 15 mm width. This was sealed with castella and oxygen absorbent in the same manner as in Example 1 to obtain a package. After 7 days after sealing, the packaging was observed and was in a depressurized state due to absorption of oxygen therein, and the packaging bag film was in close contact with the castella. When the peeling start portions 30 and 35 were peeled off and the end seals 28 and 25 and the side seals 20 and 21 were peeled in this order, the package was easily opened. The shape of the castella did not collapse.

  An easily peelable film (product name: SMX, manufactured by J Film Co., Ltd.) with a thickness of 15 μm and a biaxially stretched film of Ny and metaxylene adipamide resin (product name: Enpron M200, manufactured by Unitika Co., Ltd.) as a base layer. -Y03) was used as a heat-adhesive resin layer, and the two films were bonded together with a 2 μm-thick polyurethane two-component curable adhesive to form a laminated film constituting a packaging bag.

  This was made into a gusset-type packaging bag with a fold as shown in FIG. 4C with the heat-adhesive resin layer inside. The width of the bag is 60 mm, the width of the fold is 20 mm, the total length of the bag is 340 mm, the seal width of the thermal bonding portion is 3 mm, the width of the peeling start portion is 20 mm, the length from the intersection 28 is 15 mm, and the end in the oblique direction The seal angle R was 45 °. The seal strength of each seal portion was 6 N / 15 mm width.

  Next, castella of width 50mm, height 30mm, length 200mm is put in the above packaging bag, oxygen absorbent (Mitsubishi Gas Chemical Co., Ltd., trade name Ageless) is put, and the open end is wide. It was heat-bonded with a 7 mm linear seal to form a sealed package. After 7 days after sealing, the packaging was observed and was in a depressurized state due to absorption of oxygen therein, and the packaging bag film was in close contact with the castella. When the peeling start part was pulled and peeled in the order of the end seal, the end seal, and the side seal, the package was easily opened. The shape of the castella did not collapse.

  A 15-μm thick biaxially stretched nylon film (trade name Emblem RT, manufactured by Unitika Co., Ltd.) is used as the base layer film, and aluminum is deposited on a 15 μm-thick biaxially stretched nylon film (trade name emblem MTC, manufactured by Unitika). Is an intermediate layer film, an easily peelable film having a thickness of 40 μm (trade name Differen E7300T, manufactured by Dainippon Ink & Chemicals, Inc.) is used as a heat adhesive resin layer film, and these are polyurethane two-component curable adhesives. The laminated film used for a packaging bag was obtained by bonding together through an adhesive layer applied to a thickness of 2 μm.

  Using this laminated film, a flat bag type packaging bag as shown in FIG. 7 was made with the heat-adhesive resin layer inside. The length of the bag in the axial direction is 370 mm, the width is 130 mm, the width of the thermal bonding part is 10 mm, the width of the tip of the peeling start part is 20 mm, the length from the inverted V-shaped apex to the end of the end is 15 mm, The angle R of the bonded portion was 45 degrees. The heat seal strength of each thermal bonding part was 6 N / 15 mm width.

  Next, after putting the squid offing soaked in a sachet having a length of about 250 mm, a width of about 100 mm, and a thickness of about 30 mm into the packaging bag through the opening, the inside of the bag is deaerated, and then the opening end is a straight line having a width of 10 mm. It was heat bonded on top and sealed. This yielded a sealed package of squid pickled off the coast. When the picking part of the package was picked and peeled off with fingers, the opening could be started smoothly, and it could be easily opened with almost the same force until the end. Opening opened the entire surface of the package, and it was possible to take out the whole squid pickled without damage.

1 Four corner seal gusset type packaging bag 2-7 Side 10-15 Side 14, 15 Crease 20-23 Thermal bonding part (side seal)
24-27 Thermal bonding part (end seal)
28 Intersection points 30 and 35 of the heat-bonding portion Front and back peeling start portions 31 and 36 Base layer 32 and 37 Thermal adhesive resin layer 33 Adhesive surface 34 and 38 Contact surface 39 Peeling start portion 40 Side surface portion 41 End portion (opened end)
42 end (unopened end)
43 Opening 44, 46 Base material layer 45, 47 Thermal adhesive resin layer 50, 51 Side surface 52 Opening start film tip 60-63 Side 70-73 Thermal bonding part 80-85 Side 87, 88 Folding line 90-93 Side 94 Folding part 95-98 Thermal bonding part 99 Cutting line 100 Package 101 Contents 102 Thermal bonding part 103 Folding line 110, 111 Side surface 120, 122, 121, 123 Isosceles triangular surface 140-142 Peeling surface 200, 300 Flat bag type Packaging bag 210, 310 Side surface portion 211, 311 Open end 212, 312 Opening 220, 320 Peeling start portion 221, 223 Side 222, 322 End tip 230, 231, 330, 331 Thermal bonding portion (side seal)
232, 233, 332, 334, 336 Thermal bonding part (end seal)
234, 333, 335 vertex

Claims (8)

  A side surface that is formed of a laminated film having a base material layer and a heat-adhesive resin layer, and has a substantially axisymmetric deformed hexagonal cylinder shape in which two opposite sides are folded inward with the heat-adhesive resin layer inside. Part and one end of the deformed hexagonal cylinder sealed by thermal bonding, and a gusset-type packaging bag in the axial direction included in at least one of the six surfaces constituting the side surface portion. The two sides along the side are joined to the sides of the other surface by heat bonding between the heat-adhesive resin layers, and an opening tab is provided at the end of the one surface. The thermal bonding portion extended from two sides along the axial direction includes at least one inverted V shape that converges toward the tip direction of the end portion, and the thermal bonding portion is easily openable. A packaging bag characterized by that.   The packaging bag according to claim 1, wherein the opening tab is provided along the reverse V-shaped thermal bonding portion.   3. The packaging bag according to claim 1, wherein the sealing strength of the heat-bonded portion is 2 N / 15 mm width or more and 20 N / 15 mm width or less. The packaging bag according to any one of claims 1 to 3, wherein the one surface is formed of an easily peelable film. The packaging bag according to any one of claims 1 to 4, wherein a film separate from the laminated film is inserted as the opening tab. The gusset-type packaging bag is a four-corner seal gusset-type packaging bag in which the four sides in the axial direction excluding the two opposite sides of the deformed hexagonal shape are joined by thermal bonding, and extends from the thermal bonding portion of the four sides The thermally bonded portions of the end portions converged toward the hexagonal cylinder axis and intersected with each other to form inverted V shapes, and at least two adjacent sides of the four heat bonded portions The packaging bag according to any one of claims 1 to 5, wherein the sealing strength is 2N / 15mm width or more and 20N / 15mm width or less. The packaging bag according to claim 6, wherein the seal strength of the remaining two sides of the four sides of the heat-bonded portion is 20 N / 15 mm width or more. 8. The packaging bag according to claim 1, wherein the other surface excluding the one surface is composed of a single laminated film.

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