JP4769421B2 - Easy-to-open gusset type packaging bag - Google Patents

Description

  The present invention relates to a so-called gusset-type packaging bag made of a plastic film and suitable for packaging three-dimensional contents, and more particularly to a gusset-type packaging bag having an easy-open property that allows a package to be easily opened with fingers.

  A gusset-type packaging bag is a packaging bag that uses a plastic film as a typical packaging material and can be packaged beautifully in accordance with 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.

  However, it is troublesome to use tools for opening each time. In addition, when the film is cut with fingers, the contents may fall down due to the reaction of the cut. 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 gusset-type packaging bag that can maintain the sealed state of the contents in the package, can be easily opened with fingers, and can be easily separated from 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-A-2002-104439

  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 intimate contact, such as sheep and castella. It is an object of the present invention to provide an easily openable gusset type packaging bag that can be easily separated.

  The first of the invention is a laminated film having a base material layer and a heat-adhesive resin layer, and has a 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 part and an end part 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 faces constituting the side part. Two sides along the axial direction of the cylinder are joined to sides of the other surface by thermal bonding, and an opening tab is provided at the end of the one surface, and two sides along the axial direction are provided. The packaging bag is characterized in that the heat-bonding portion converges in a substantially square shape toward the opening tab and the heat-bonding portion is easily openable.

  Here, 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 Is converged into a generally square shape toward the opening tab, and among the four sides of the heat-bonding portion, at least two adjacent seal strengths are 2N / 15 mm width or more and 20 N / 15 mm width or less. It is preferable that there is. 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.

  A second aspect of the invention is a laminated film having a base material layer and a heat-adhesive resin layer, and a side part in which contents are stored in a substantially rectangular tube shape with the heat-adhesive resin layer inside. , A gusset-type package having both ends of the square tube sealed by thermal bonding, wherein at least one of the ends has a substantially dormitory roof shape provided with an opening tab. None, two sides along the axial direction of the square tube included in at least one of the four surfaces constituting the side surface portion are joined to the sides of the other surface by thermal bonding, and along the axial direction A package characterized in that two heat-bonding portions converge toward the opening tab along the ridgeline of the ridge roof shape, and the heat-bonding portion is easily openable. .

  Even if the contents are fragile, they can be opened easily and reliably without damaging the contents, and even in a package where the contents and the film are in close contact, such as yokan and castella. An easily openable gusset-type packaging bag in which the product and the film can be easily separated is obtained.

  Embodiments of the present invention will be specifically described with reference to the drawings. 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 thermal bonding portion is indicated by hatching. The same applies to FIGS.

  The packaging bag 1 includes a side surface portion 40 that forms a cylindrical space for storing the contents, and end portions 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 an oblique line forming an acute angle R with respect to the end sides 10, 12 and the like of the side surface portion 40, and has a “C” shape converging toward the symmetry axis or It has an almost isosceles trapezoidal shape. Along the “C” -shaped or isosceles trapezoidal legs, there are strip-like heat-bonding portions 24 to 27 that are continuous from the side seals 20 to 23 (hereinafter, these may be referred to as “end seals”). Is provided. Thereby, the force applied at the time of opening can be utilized efficiently. That is, it can be opened 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 45 ° or less, more preferably 30 ° or more and 45 ° 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.

  On the upper end portion of the “C” -shaped upper end portion or the short side of the isosceles trapezoidal shape of the end portion 41, there are peeling start portions 30 and 35 that serve as knobs when the package is opened with fingers. It protrudes from the part or upper bottom part. The peeling start portions 30 and 35 are separated by extending the films of the side surface 2 and the side surface 3 in the axial direction, only the upper end portion or the upper bottom portion 28 is thermally bonded to each other, and the other portions are not thermally bonded. It remains in a state. The thermal bonding portion 28 is provided continuously with the end seals 24 and 25. Opening of the package starts by picking each of the peeling start portions 30 and 35 with fingers of both hands and pulling them left and right.

  Here, as for the size of the peeling start portions 30 and 35, it is preferable that the width in the direction perpendicular to the axial direction is 5 mm or more and the length along the axial direction is 5 mm or more toward FIG. More preferably, the width is 7 mm or more and the length is 7 mm or more, and further 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.

  Of the heat-bonded portions of the packaging bag 1, a continuous belt-shaped heat-bonded portion composed of the upper bottom portion 28 that is the outer edge of the side surface 2, the end seals 24 and 25, and the side seals 20 and 21 is easily opened. It is sealed with a relatively low sealing strength. 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 can 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 easily 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 A-A '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 opening start is inserted into the peeling start portion of the sealed end portion 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. The opening start film 48 is bonded to a peeling start portion connected to the film on the side to be peeled off at the time of opening, of the 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 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 peeling start portions 30 and 35 in the heat bonding portion 28 in the upper bottom portion. The opening start film 49 may be inserted partway through the heat bonding portion 28, or the tip 52 may reach the inside of the packaging bag 1 beyond the heat bonding portion 28. 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 thermal bonding portion 28 in the portion overlapping the thermal bonding portion 28, and the size of the other portions is within a range that can be used effectively. Is optional. 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. The end 41 serving as the unsealing end is cut into an isosceles trapezoidal shape using an appropriate die blade if necessary, and if necessary, the unsealing start film is sandwiched between the end 41 and a heat as shown in FIG. What is necessary is just to adhere.

  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 unsealing end of the package 100 has a generally roofed roof shape formed by substantially isosceles trapezoidal surfaces 120 and 122 and substantially isosceles triangular surfaces 121 and 123, and the ridgeline is thermally bonded. It has become. Moreover, the peeling start parts 30 and 35 are located in the top part of the ridge 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 has the shape of the ridgeline of the dormitory roof, and the film itself does not have to be cut into the ridge roof shape. However, it is desirable to cut the film itself into the shape of the roof as shown in the drawing from the viewpoint of preventing unexpected bag breakage and aesthetics.

  The other end 42 of the package 100 need not be an open end. Therefore, the film at the end is folded at a folding line 103 and 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 immediately before starting opening, (b) is the perspective view which showed the state in the middle of opening. Opening is performed as follows. First, the picking pieces 30 and 35 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 thermal bonding portion 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. 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.

  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 gusset-type packaging bag with folds as shown in FIG. The width of the bag is 60 mm, the width of the fold is 20 mm, the total length of the bag is 250 mm, the seal width of the thermal bonding portion 28 is 7 mm, the seal width of the other end seals and side seals is 3 mm, the peeling start portion 30, The width of 35 was 20 mm, the length was 15 mm, and the angle R of the end seal in the oblique direction was 45 °. The seal strength of each seal part was 6 N / 15 mm width.

  Next, castella of width 50mm, height 30mm, length 150mm 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 gusseted packaging bag with a fold as shown in FIG. The width of the bag is 60 mm, the width of the fold is 20 mm, the total length of the bag is 250 mm, the seal width of the heat-bonding portion at the base of the opening start portion is 7 mm, and the seal width of the other end seals and side seals is 3 mm. The width of the start part was 20 mm, the length was 15 mm, and the angle R of the end seal in the oblique direction was 45 °. The seal strength of each seal portion was 6 N / 15 mm width.

  Next, castella of width 50mm, height 30mm, length 150mm 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.

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) A-A '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. It is sectional drawing which showed the example (a) by 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.

Explanation of symbols

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 Thermal bonding part (end seal or top bottom part)
30, 35 Peeling start part 31, 36 Base material layer 32, 37 Thermal adhesive resin layer 33 Adhesive surface 34, 38 Contact surface 40 Side surface part 41 End part (opening 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 Folded 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 Isosceles trapezoidal surface 121, 123 Isosceles triangular surface 140-142 Peeling surface

Claims (8)

A hexagon consisting of a laminated film having a base material layer and a heat-adhesive resin layer, comprising six side surfaces connected to each other at six sides substantially parallel to the axial direction so that the heat-adhesive resin layer is on the inner side A side surface portion constituting a cylinder, wherein a side surface portion having a deformed hexagonal cylinder shape in which four side surfaces are folded inside a hexagonal cylinder with two opposite sides of the six sides as creases, and the deformed hexagonal cylinder A gazette-type packaging bag having one end of both ends and sealed by thermal bonding , and two sides of six sides substantially parallel to the axial direction of the hexagonal cylinder, said side portions dihedral two sides that is part of at least one surface of which is not folded inside out of the six surfaces constituting the is by thermal bonding are bonded to the sides of the other side, to the end portion of the one surface Is the end portion of the opening tab having one surface extended in the axial direction? Protrudes, which converge in the shape of a substantially C thermal bonding portion of the end portion continuous to the thermal bonding portion of the substantially parallel two sides in the axial direction toward the opening for the tab, the dihedral Of these, the other end of the surface other than the one surface is provided with another opening tab protruding from the end, the other surface extending in the axial direction, and the opening. The gripping piece for cutting and the other opening picking piece are thermally bonded to each other only at the upper bottom portion of the end portion, and the heat bonding portion of the two sides substantially parallel to the axial direction and the heat of the end portion. A packaging bag characterized in that the adhesive part is easily openable.   The packaging bag according to claim 1, wherein the sealing strength of the heat-bonded portion is 2N / 15mm width or more and 20N / 15mm width or less.   The packaging bag according to claim 1, wherein the one surface is made of an easily peelable film.   The packaging bag according to any one of claims 1 to 3, 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 the thermal bonding portion of the four sides is the Converging in a generally square shape toward the opening tab, and the seal strength of at least two adjacent sides of the four sides of the heat-bonded portion is not less than 2N / 15 mm width and not more than 20 N / 15 mm width The packaging bag according to any one of claims 1 to 4.   6. The packaging bag according to claim 5, 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.   5. The packaging bag according to claim 1, wherein the other surface excluding the one surface is composed of a single laminated film. A side surface portion that is composed of a laminated film having a base material layer and a heat-adhesive resin layer, has a substantially rectangular tube shape with the heat-adhesive resin layer inside, and stores contents, and both ends of the square tube Is a gusset-type package having an end portion sealed by thermal bonding, wherein at least one end portion of the end portion has a substantially dormitory roof shape provided with a tab for opening, The two sides along the axial direction of the square cylinder included in at least one of the two surfaces having the larger area among the four surfaces constituting the side surface part are joined to the sides of the other surface by thermal bonding, The heat-bonded portion at the one end continuous with the two-side heat-bonded portions along the axial direction converges toward the opening tab along the ridgeline of the ridge roof shape, and the unsealing The knob for the above-mentioned one side extends in the axial direction from the substantially laid roof shape. Of the two surfaces, other opening tabs with the other surface extending in the axial direction project from the end portion of the other surface other than the one surface. The opening tab and the other opening tab are thermally bonded to each other only at the upper bottom portion of the end portion, and two-sided thermal bonding along the axial direction is provided. The packaging body characterized in that the portion and the heat-bonded portion at the one end are easily openable.

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