JP2018002226A - Package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package excellent in convenience by preventing outflow of contents with fluidity after opening.SOLUTION: A package 1 includes a tetrahedral storage part 9 for housing contents, and first and second seal parts 5 and 6, the inner layers of which are thermally bonded together along two sides, torsionally facing each other at an angle of 90°, of the storage part 9. Both extension-direction ends of the first seal part 5 have protrusions 50 protruding toward the second seal part 6, respectively. An inner edge 50a, which faces the storage part 9, of the protrusion 50 is inclined with respect to the extension direction of the first seal part 5.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a tetrahedral package for packaging foods and the like.

  A conventional package is disclosed in Patent Document 1. The package formed by the laminated film of Patent Document 1 has a tetrahedral storage portion in which contents are stored. Further, the storage portion is twisted by 90 ° and two opposite sides are thermally bonded by the seal portions.

  The package is opened by breaking the laminated film along one seal portion, and the contents are taken out.

  Further, when the laminated film is broken from the central portion of one seal portion, two surfaces to be thermally bonded by the seal portion of the storage portion are torn. When the both ends of the broken seal part are expanded in the direction away from each other, the opening opening reaches both side ends of the other seal part, and the package is opened in a boat shape. Thereby, the package after opening can be used as a container (dish), and the contents can be taken out.

Japanese Utility Model Publication No. 3-90874

  However, according to the conventional package, the package formed by the laminated film is easily deformed. For this reason, when the contents have fluidity and the package is opened in a boat shape, the contents leak out from both side ends of the second seal portion. For this reason, there was a problem that the convenience of the package was poor.

  In view of the above problems, an object of the present invention is to provide a package that is excellent in convenience by preventing leakage of contents having fluidity.

  In order to achieve the above object, the present invention provides a package formed of a laminated film having at least an outer layer and an inner layer made of a heat-adhesive resin, and is a tetrahedron-shaped storage unit in which contents are stored. And a first seal part and a second seal part that thermally bond the inner layers along two opposing sides twisted by 90 ° of the storage part, and the first seal part faces the second seal part. The projecting portions projecting at both ends in the extending direction, and the inner edge of the projecting portion facing the storage portion is inclined with respect to the extending direction of the first seal portion.

  Further, the present invention is characterized in that, in the package having the above-described configuration, the inner edge is formed of a straight line and has an angle of 5 ° or more and 80 ° or less with respect to the extending direction of the first seal portion.

  Moreover, the present invention is characterized in that, in the package having the above-described configuration, the protruding amount of the protruding portion is 3 mm or more.

  Moreover, the present invention is characterized in that, in the package having the above-described configuration, the inner edge is formed of a convex curve in a direction away from the storage portion.

Moreover, this invention is a package of the said structure WHEREIN: One end part extends from the said 1st seal | sticker part in the direction orthogonal to the said 1st seal | sticker part, and the other end part from said 2nd seal | sticker part is said 2nd. A third seal portion extending in a direction orthogonal to the seal portion and thermally bonding the inner layers to each other;
The laminated film has an easy tear property in a direction parallel to the extending direction of the third seal portion.

  Moreover, the present invention is characterized in that, in the package body configured as described above, an opening start means is provided at a central portion in the extending direction of the second seal portion.

  Further, the present invention is characterized in that, in the package having the above-described configuration, at least one layer constituting the laminated film is a uniaxially stretched film stretched in the extending direction of the third seal portion.

  Moreover, the present invention is characterized in that, in the package having the above structure, the inner layer is a uniaxially stretched film stretched in the extending direction of the third seal portion.

  Moreover, the present invention is characterized in that in the package having the above-described structure, a barrier layer having gas barrier properties is provided between the outer layer and the inner layer.

  According to the present invention, two sides of the tetrahedron-shaped storage portion that are twisted by 90 ° are bonded to each other by the first seal portion and the second seal portion, and the inner edges of the protruding portions provided at both ends of the first seal portion are the first. It inclines with respect to the extending direction of a seal part. Thereby, when it breaks from the center part of a 2nd seal | sticker part and a package body is opened by boat shape, the leakage of the content which has fluidity | liquidity by a protrusion part is prevented. Further, since wrinkles are unlikely to occur at the time of opening due to the inclination of the inner edge of the protruding portion, the package can be stably placed and the residue of fluid contents can be reduced. Therefore, the convenience of the package can be improved.

The perspective view of the package which concerns on 1st Embodiment of this invention. The front view of the package which concerns on 1st Embodiment of this invention. The expanded view of the package which concerns on 1st Embodiment of this invention. Sectional drawing which shows the layer structure of the laminated | multilayer film laminated | stacked which comprises the blank sheet | seat of the package which concerns on 1st Embodiment of this invention. The top view of the elongate laminated film with which the blank sheet of the package which concerns on 1st Embodiment of this invention continued. The perspective view which shows the state after opening the package which concerns on 1st Embodiment of this invention. The top view which expands and shows a part of 1st seal | sticker part of the package which concerns on 2nd Embodiment of this invention. Sectional drawing which shows the laminated constitution of the laminated | multilayer film which comprises the package which concerns on 3rd Embodiment of this invention.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the package 1, and FIG. 2 is a front view of the package 1. The package 1 is formed of a blank sheet 102 (see FIG. 2), and has a tetrahedron-shaped storage portion 9 composed of a triangular bottom surface 3 and side surfaces 4a to 4c. A content 10 is hermetically stored in the storage portion 9. A bottom seal portion (first seal portion) 5 is formed by thermal bonding along one side 13 connecting the bottom surface 3 and the side surface 4c. Further, a top seal portion (second seal portion) 6 is formed by thermal bonding along one side 14 connecting the side surfaces 4a and 4b. The bottom seal portion 5 and the top seal portion 6 are twisted by 90 ° and face each other.

  Further, a back seal portion (third seal portion) 7 is formed by thermal bonding continuously from the top seal portion 6 to the bottom seal portion 5. One end of the back seal portion 7 extends from above the top seal portion 6 in a direction orthogonal to the top seal portion 6. The other end of the back seal portion 7 extends from above the bottom seal portion 5 in a direction perpendicular to the bottom seal portion 5. Further, the back seal portion 7 extends so as to straddle one side 11 connecting the bottom surface 3 and the side surface 4a. In addition, the front surface of the package 1 is a non-formation surface of the back seal portion 7, and is a side surface 4c in which the bottom seal portion 5 is disposed on the bottom side. The bottom seal portion 5, the top seal portion 6 and the back seal portion 7 are formed by causing inner layers 23 of a laminated film 2 described later to face each other and thermally bonding with a predetermined width.

  Protruding portions 50 that protrude toward the top seal portion 6 are provided at both ends in the extending direction of the bottom seal portion 5. The inner edge 50 a of the protruding portion 50 facing the storage portion 9 is formed with a curved line that is inclined with respect to the extending direction of the bottom seal portion 5 and is away from the storage portion 9. Moreover, the protrusion amount of the protrusion part 50 is 3 mm or more. When the protruding amount is smaller than 3 mm, the height of a side wall 9b (see FIG. 6) of the storage unit 9 described later is formed low, and the fluid content 10 may leak from the side wall 9b.

  In addition, an opening notch (V notch) 6 a is provided at the center in the extending direction of the top seal portion 6.

  FIG. 3 is a development view of the package 1, and the package 1 is formed from one rectangular blank sheet 102. As will be described later, the side surfaces 4a and 4b are formed in the same triangular shape by thermally bonding the blank sheet 102, and the bottom surface 3 and the side surface 4c are the same in which two corners are formed in an arc shape by the inner edge 50a of the protruding portion 50. It is formed in a triangular shape. Further, a bottom seal portion 5, a top seal portion 6, and a back seal portion 7 are arranged so as to surround the bottom surface 3 and the side surfaces 4a to 4c. The side surface 4a and the bottom surface 3 are partially divided. The side 11 connecting the bottom surface 3 and the side surface 4a, the side 12 connecting the bottom surface 3 and the side surface 4b, the side 15 connecting the side surfaces 4a and 4c, and the side 16 connecting the side surfaces 4b and 4c are formed in a tetrahedral shape. 9 is a ridge line when 9 is formed.

  Moreover, the blank sheet 102 has linear easy tearability (linear tearability) in the extending direction of the back seal portion 7. This easy tear direction coincides with the MD direction (longitudinal direction: Machine Direction = film flow direction), and the tear propagation resistance value in the MD direction is larger than that in the TD direction (transverse direction = transverse direction = film width direction). Small.

  The easy tear direction (MD direction) extends in a direction orthogonal to the extending direction of the top seal portion 6 on the side surfaces 4a and 4b where the top seal portion 6 is one side in the package 1 of FIG. The bottom seal portion 5 extends in a direction orthogonal to the extending direction of the bottom seal portion 5 on the side surface 4c and the bottom surface 3 forming one side. For this reason, when the side surfaces 4 a and 4 b are torn straightly from the opening notch 6 a of the top seal portion 6 in the easy tear direction, the tear line reaches the protruding portion 50.

  FIG. 4 is a cross-sectional view showing a laminated structure of the laminated film 2 constituting the blank sheet 102. The laminated film 2 is a laminated body in which an outer layer 22 and an inner layer 23 made of a thermal adhesive (thermoplastic) resin layer are laminated.

  Since the outer layer 22 is a basic material constituting the package 1, a synthetic resin film having excellent properties in mechanical, physical, chemical and the like can be used. For example, polyester, polyamide, A polypropylene resin or the like can be used. The thickness of the film constituting the outer layer 22 may be determined in consideration of cost and the like, but about 12 to 25 μm is appropriate.

  As a specific example of the outer layer 22, a single body such as a uniaxially stretched nylon film, a biaxially stretched nylon film, a polypropylene film (OPP), a polyester resin film, or a laminate thereof is used. Specific examples of the polyester resin film include polyethylene terephthalate resin (PET), polybutylene terephthalate resin, polyethylene-2, 6-naphthalate resin, polybutylene-2, 6-naphthalate, and polycyclohexanedimethylene terephthalate resin. Various polyester resins can be used.

  The outer layer 22 may be formed with a print layer to which a desired print pattern such as a character, graphic, symbol, or pattern is added. The printing layer is formed by printing a desired printed pattern on the back surface of the outer layer 22 by a printing method such as gravure printing, offset printing, letterpress printing, screen printing, transfer printing, flexographic printing or the like using the ink composition.

  The ink composition contains one or more ordinary ink vehicles as a main component, and if necessary, a plasticizer, a stabilizer, an antioxidant, a light stabilizer, an ultraviolet absorber, a curing agent, a crosslinking agent, and a lubricant. In addition, one or more additives such as antistatic agents and fillers are optionally added, and further colorants such as dyes and pigments are added, and the mixture is sufficiently kneaded with a solvent, a diluent, and the like. .

  The inner layer 23 is a layer made of a heat-adhesive (thermoplastic) resin, and is melted by heat to fuse the laminated film 2. Examples of the heat-adhesive resin used for the inner layer 23 include low density polyethylene (LDPE), medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene (LLDPE), polypropylene (CPP), and vapor deposition layer. (Silica, alumina, aluminum, etc.) provided polypropylene (VMPP), ethylene-α olefin copolymer, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, Ester copolymers of ethylene and acrylic acid esters, ethylene-methacrylic acid copolymers, ethylene-propylene copolymers, methylpentene polymers, polyolefin resins (polyethylene, polypropylene, etc.) with unsaturated carboxylic acids (acrylic acid, methacrylic acid, Anhydrous male It can be to one not selected from modified acid-modified polyolefin resins in fumaric acid, etc.) using two or more kinds.

  The thickness of the inner layer 23 may be appropriately determined in consideration of required physical properties (heat sealability), cost, and the like, and is preferably about 10 μm to 100 μm, particularly preferably about 15 μm to 50 μm. As a method for forming the inner layer 23, a method of laminating a single layer or a multilayer film of the above-mentioned thermoadhesive resin, or a method of laminating the thermoadhesive resin by a melt extrusion method is used.

  Furthermore, by using a stretched uniaxially stretched film for at least one of the outer layer 22 and the inner layer 23, the tear propagation resistance value in the tear direction of the laminated film 2 is reduced, and the tearability of the laminated film 2 is improved. Can do. In particular, the heat-adhesive resin constituting the inner layer 23 tends to be sticky by heating, and the tearability tends to be reduced. For this reason, in particular, in the case where the package 1 is used for cooking while the contents 10 are filled, it is preferable to use a uniaxially stretched film for the inner layer 23 to improve the tearability.

  As a production method of the laminated film 2, a lamination method used when producing a normal packaging material, for example, a dry lamination method, a wet lamination method, a solventless lamination method, a coextrusion lamination method, an inflation method, or the like is used. it can.

  Further, when the above layers are laminated, if necessary, pretreatment such as corona discharge treatment, ozone treatment, flame treatment, blast treatment, etc. can be optionally applied to the surface of the substrate to be laminated.

  FIG. 5 is a plan view of the long laminated film 2 in which the blank sheets 102 are continuous. In the manufacturing method of the package 1, first, a long laminated film 2 having a shape in which a plurality of blank sheets 102 are continuous at the bottom seal portion 5 and the top seal portion 6 is set in a filling machine.

  The laminated film is formed with an easy tear direction (MD direction) parallel to the back seal portion 7. Moreover, the adjacent blank sheet | seat 102 is arrange | positioned so that the bottom face 3 and the side surfaces 4a-4c may become symmetrical in MD direction on both sides of the bottom seal part 5 or the top seal part 6. FIG.

  Next, while sequentially feeding the laminated film 2 from the tip, the back seal portions 7 are continuously thermally bonded to each other by curving in the width direction (vertical direction in FIG. 4) so that the inner layer 23 faces. By dividing the back seal portion 7 by thermal bonding, the divided bottom surface 3 and side surface 4a are joined.

  Next, both ends of the side surface 4c arranged on the straight line extending in the easy tear direction (MD direction) from the notch 6a for opening the bottom seal portion 5 of the laminated film 2 formed into a ring by thermally bonding the back seal portion 7 It is bent at the portion (position of arrow B in FIG. 3), and is superposed and heat-bonded so that the inner layer 23 faces. At this time, projecting portions 50 projecting toward the top seal portion 6 are formed at both ends of the side surface 4c. Next, a predetermined amount of contents 10 (here, fluid food) is filled from the remaining unsealed portion (top seal portion 6).

  Thereafter, the top seal portion 6 and the top seal portion 6 of the next packaging body 1 are bent at both end portions (positions of arrows A in FIG. 3) of the side surface 4b, overlapped so that the inner layers 23 face each other, and thermally bonded simultaneously. The tetrahedral storage portion 9 is formed. At this time, the bottom seal portion 5 and the top seal portion 6 are twisted by 90 ° and face each other.

  Finally, the space between the top seal portions 6 is cut with a slitter to form the package 1 as shown in FIG. Therefore, in the next package 1, the contents 10 are filled from the bottom seal portion 5 which is an unsealed portion. Thereafter, the above procedure is repeated to form the package 1 continuously.

  In addition, as a method of heat bonding, it can carry out by well-known methods, such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, an ultrasonic seal, for example.

  FIG. 6 is a perspective view showing a state after the package 1 is opened. The package 1 shown in FIG. 1 is torn from the opening notch 6a of the top seal portion 6 as a starting point. Thereby, the side surfaces 4a and 4b continuing to the top seal portion 6 are smoothly torn along the easy tear direction (MD direction) of the laminated film 2.

  Further, when the opening 9a is expanded in a direction in which both ends of the cut top seal portion 6 are separated from each other, a tear line due to tearing reaches the inner edge 50a of the projecting portion 50 and the housing portion 9 stops breaking. As a result, a boat-shaped container having a large opening 9a at the top is formed. The bottom portion 9c of the container is formed by the bottom surface 3 and the side surface 4c, and the side wall 9b of the container is formed by the bottom surface 3 and the side surfaces 4a, 4b, 4c.

  At this time, the side wall 9 b of the storage portion 9 is reinforced by the protruding portions 50 protruding from both ends of the bottom seal portion 5. The lowest part of the side wall 9 b of the storage part 9 is the lowest end of the breaking line and is located at the inner edge 50 a of the protruding part 50. Thereby, even if the bottom part 9c of the storage part 9 is flattened by the weight of the content 10 having fluidity, the side wall 9b of the storage part 9 reinforced by the protruding part 50 is maintained at a constant height. Therefore, leakage of the contents 10 can be prevented, and the package 1 can be placed stably.

  Moreover, since the inner edge 50a of the protrusion part 50 inclines with respect to the extending direction of the bottom seal part 5, when the side surfaces 4a and 4b are folded along the inner edge 50a, wrinkles are not easily generated inside the storage part 9. For this reason, the residue of the content 10 can be reduced inside the storage unit 9. At this time, the inner edge 50a of the projecting portion 50 has a convex curve in a direction away from the storage portion 9. Thereby, the wrinkles inside the storage part 9 when the side surfaces 4a and 4b are folded back can be further reduced. Moreover, since the inclination angle of the inner edge 50a becomes large at both ends of the bottom seal portion 5, it is possible to prevent leakage of the contents when the boat-shaped container with the package 1 opened is inclined.

  According to the present embodiment, the inner edges of the protrusions 50 provided at both ends of the bottom seal portion 5 (first seal portion) are inclined with respect to the extending direction of the bottom seal portion 5. Thereby, when the packaging body 1 is opened in a boat shape by breaking from the center portion of the top seal portion 6 (second seal portion), leakage of the fluid content is prevented by the protruding portion 50. Moreover, since wrinkles are unlikely to occur at the time of opening due to the inclination of the inner edge of the protrusion 50, the residue of the fluid content can be reduced. Therefore, the convenience of the package 1 can be improved.

  Moreover, since the protrusion amount of the protrusion part 50 was 3 mm or more, the leakage of the fluid content can be more reliably prevented.

  Moreover, since the inner edge 50a of the protrusion part 50 consists of a convex curve in the direction away from the storage part, the wrinkles inside the storage part 9 when the side surfaces 4a and 4b are folded back can be further reduced. Moreover, since the inclination angle of the inner edge 50a becomes large at both ends of the bottom seal portion 5, it is possible to prevent leakage of the contents when the boat-shaped container with the package 1 opened is inclined.

  Further, since the easy tear direction (MD direction) of the laminated film 2 is arranged in a direction parallel to the extending direction of the back seal portion 7 (third seal portion), the lamination is performed with the center portion of the top seal portion 6 as the opening start point. The storage part 9 can be smoothly torn along the easy tear direction (MD direction) of the film 2. Therefore, the package 1 can be easily opened to form a boat-shaped container.

  In addition, by providing the opening notch 6a (opening start means) at the center in the extending direction of the top seal portion (second seal portion) 6, the packaging body 1 can be easily opened to improve convenience. Can do.

Second Embodiment
Next, a second embodiment of the present invention will be described. FIG. 7 is an enlarged plan view showing a part of the bottom seal portion 5 of the package 1 of the second embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. In the present embodiment, the shape of the protrusion 50 is different from that of the first embodiment. Other parts are the same as those in the first embodiment.

  The inner edge 50a of the protruding portion 50 protruding from both ends of the bottom seal portion 5 is formed by a straight line. Further, the inclination angle θ of the inner edge 50a of the protruding portion 50 with respect to the extending direction of the bottom seal portion 5 is formed to be 5 ° or more and 80 ° or less.

  When the inclination angle θ of the inner edge 50a is smaller than 5 °, the contents easily leak out when the boat-shaped container with the package 1 opened is inclined. Moreover, when the inclination | tilt angle (theta) of the inner edge 50a is larger than 80 degrees, when the package 1 is opened, it will become difficult to return | fold the side surfaces 4a and 4b along the inner edge 50a. For this reason, wrinkles are likely to occur inside the storage portion 9, and residues of the contents 10 are likely to occur.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. FIG. 8 is a cross-sectional view showing the layer structure of the laminated film 2 constituting the package 1 of the third embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. In the present embodiment, a barrier layer 24 is provided between the outer layer 22 and the inner layer 23. Other parts are the same as those in the first embodiment.

  For the barrier layer 24, it is preferable to use a material having excellent water vapor barrier properties and gas barrier properties when the content 10 to be sealed is easily altered by moisture or oxygen. Specifically, resin films such as ethylene / vinyl alcohol copolymer (EVOH), polyvinylidene chloride (PVDC), polyacrylonitrile (PAN), biaxially stretched polyethylene terephthalate (PET), and biaxially stretched polypropylene (OPP) are used. Can be used. In addition, a vapor-deposited layer (silica, alumina, aluminum, etc.) having a barrier property, a metal foil (aluminum, etc.), a coating layer (polyvinylidene chloride, etc.) on a base material layer made of a resin film such as polyethylene terephthalate and biaxially stretched nylon ) Etc. may be provided.

  Since the film provided with the aluminum foil or the aluminum vapor deposition layer is opaque, it can also serve as a light shielding layer. As the aluminum foil used for the barrier layer 24, an annealed aluminum foil is appropriate, and a thickness of about 6 to 15 μm is appropriate.

  Also, a biaxially stretched nylon film used as the outer layer 22, a vapor-deposited layer of silica, alumina, aluminum or the like, or a coating layer of polyvinylidene chloride, ethylene / vinyl alcohol copolymer (EVOH), etc. on the back surface of the polyester resin film. It may be provided as the barrier layer 24.

  Further, as the outer layer 22, a nylon / EVOH / nylon laminated film, a nylon / metaxylylenediamine / adipic acid copolymer (MXD) / nylon laminated film, or the like may be used to form a barrier property with a multilayer structure. .

  The physical properties required for the package 1, such as mechanical toughness, flex resistance, puncture resistance (pinhole resistance), impact resistance, cold resistance, heat resistance, chemical resistance, etc. Therefore, a material having excellent physical properties may be used for the barrier layer 24.

  Specifically, stretched films of polyolefin such as polyester, polyamide, polyethylene, polypropylene, and ethylene-propylene copolymer can be used.

  Furthermore, by using a film having high heat resistance as the laminated film 2, the contents 10 can be cooked by heating in a state where the package 1 is filled. For example, the contents 10 can be boiled by putting the unopened package 1 in hot water.

  In addition, by using the laminated film 2 that does not include a metal layer as the barrier layer 24 and has a melting point of 100 ° C. or higher, cooking by a microwave oven is also possible. In this case, in order to prevent the package 1 from being ruptured due to an increase in internal pressure during heating, a small hole may be formed in the storage portion 9 by slightly breaking the side surfaces 4a and 4b from the top seal portion 6.

  Alternatively, the barrier layer 24 may be configured by laminating a plurality of the above-mentioned base materials listed as the barrier layer 24. In addition, by using a stretched uniaxially stretched film for at least one of the outer layer 22, the inner layer 23, and the barrier layer 24, the tear propagation resistance value in the tear direction of the laminated film 2 is reduced, and the tearability of the laminated film 2 is reduced. Can be improved.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, in the above-described embodiment, the opening notch 6a is formed as a V-notch as opening opening means, but an I-notch or a U-notch may be used instead of the V-notch. Moreover, it can replace with the notch 6a for opening and can provide the scar group area | region which consists of a some fine piercing hole in the top seal | sticker part 6. FIG.

  Further, a printing mark that guides the user to start opening the central portion of the top seal portion 6 without providing the top seal portion 6 with the opening start means may be provided. The user can open the package 1 so as to form a boat-shaped container by forming a notch with a scissor or the like in the center of the top seal portion 6 with the printed mark as a mark to form an opening start point. Moreover, the end surface of the top seal portion 6 may be formed in a saw shape, and a plurality of opening notches (V notches) 6a may be provided in parallel in each extending direction. In this case, the user can open the package 1 at an arbitrary position, and the user can freely select the size of the opening 9a.

  Moreover, in the said embodiment, although the package 1 was opened from the notch 6a for opening formed in the top seal part 6, while forming the protrusion part 50 in both the top seal part 6 and the bottom seal part 5, it is the bottom seal part 5 An opening notch may be provided at the center in the extending direction. In this case, when the packaging body 1 is inverted so that the side surface 4a faces downward, the bottom seal portion 5 and the top seal portion 6 are interchanged. Accordingly, the bottom surface 3 and the side surface 4c can be broken from the opening notch formed in the bottom seal portion 5 in place of the top seal portion 6, and the package 1 can be opened to form a boat-shaped container.

  Hereinafter, the effects of the present invention will be described in more detail using examples.

  A 12 μm thick silica-deposited polyethylene terephthalate film (IBPET-RB, manufactured by Dai Nippon Printing Co., Ltd.) is used as the outer layer 22 on which the barrier layer 24 is laminated, and a dry laminate layer is laminated on the barrier layer 24 (silica deposition layer). After that, a uniaxially stretched nylon film (emblem NCBC, manufactured by Unitika Co., Ltd.) having a thickness of 15 μm and having an easy tear property was laminated as the barrier layer 24. Next, after laminating a dry laminate layer on the surface of the barrier layer 24, a 40 μm thick polypropylene film (ZK99S, manufactured by Toray Film Processing Co., Ltd.) is laminated as the inner layer 23, and a laminate film having easy tearability in the MD direction. 2 was produced. Using this laminated film 2, a regular tetrahedral package 1 having a side of 100 mm as shown in FIG. 1 was produced. In addition, the easy tear direction of the laminated film 2 was arranged in parallel with the extending direction of the back seal portion 7. Further, the protruding portions 50 are formed at both ends of the bottom seal portion 5. The protruding portion 50 is formed with a width of 30 mm in the extending direction of the bottom seal portion 5, and the inclination angle θ of the inner edge 50a is 30 °.

  As the outer layer 22, a 15 μm thick composite nylon stretched film (BWC15, manufactured by Gunze Co., Ltd.) is used. After laminating a dry laminate layer on the surface of the outer layer 22, the inner layer 23 is uniaxially stretched with a thickness of 50 μm and easy tearing. A laminated film 2 having easy tearability in the MD direction was produced by laminating a polypropylene film. The laminated film 2 had a melting point of 130 ° C. or higher. Using this laminated film 2, a package 1 having the same shape as in Example 1 was produced.

  A 12 μm thick polyethylene terephthalate film (CB-931, manufactured by Kolon Co., Ltd.) is used as the outer layer 22, and a 12 μm thick silica-deposited polyethylene terephthalate film (Part No. 1312, manufactured by Toray Film Processing Co., Ltd.) is used as the barrier layer 24. Then, the outer layer 22 and the barrier layer 24 were bonded via a dry laminate layer. At this time, the deposited silica layer of the barrier layer 24 was disposed on the surface opposite to the outer layer 22. Moreover, after laminating a dry laminate layer on the silica vapor deposition layer side of the barrier layer 24, a laminated film having easy tearability in the MD direction is laminated by laminating a uniaxially stretched polypropylene film having a thickness of 50 μm as the inner layer 23. 2 was produced. Using this laminated film 2, a package 1 having the same shape as in Example 1 was produced. In addition, the protrusion part 50 which concerns on Example 3 was formed in 10 mm width in the extension direction of the bottom seal part 5, and the inclination | tilt angle (theta) of the inner edge 50a was 80 degrees.

[Comparative Example 1]
The laminated film according to Comparative Example 1 has the same layer structure as that of Example 3, and a package having the same shape as that of Example 1 was produced using this laminated film. Note that the package according to Comparative Example 1 does not have the protruding portion 50 formed on the bottom seal portion 5.

[Comparative Example 2]
The laminated film which concerns on the comparative example 2 took the same layer structure as Example 3, and manufactured the package of the same shape as Example 1 using this laminated film. In addition, the protrusion part 50 which concerns on the comparative example 2 was formed in 30 mm width in the extension direction of the bottom seal part 5, and the protrusion amount of the protrusion part 50 was 30 mm. The inclination angle θ of the inner edge 50a was 90 °.

[Comparative Example 3]
The laminated film according to Comparative Example 3 has the same layer structure as Example 1, and a package having the same shape as Example 1 was produced using this laminated film. Note that the package according to Comparative Example 3 does not have the protrusion 50 formed on the bottom seal portion 5.

  The suitability of the packaging body 1 of Examples 1 to 3 and the packaging bodies of Comparative Examples 1 and 2 as containers was evaluated. Moreover, the packaging bodies of Examples 2 and 3 and Comparative Examples 1 and 2 were evaluated for suitability for use after heating.

  For the evaluation of the suitability for use, the suitability for use at the time of opening and the suitability for use as a container after opening were evaluated. The applicability at the time of opening is determined visually by checking whether or not there is leakage of the content 10 having fluidity when the package is torn and opened from the center of the top seal portion 6 to both ends of the bottom seal portion 5. evaluated. The evaluation criteria were ◎ when there was no leakage of the contents 10 at the time of opening, Δ when there was a small amount of leakage of the contents, and × when there was a large amount of leakage of the contents.

  As shown in FIG. 5, the suitability for use after opening was evaluated by visual observation whether or not the contents 10 having fluidity were leaked when the package 1 was a boat-shaped container. The evaluation criteria are ◎ when the packaging body 1 can be stably placed and the contents 10 are not leaked, and △ when the packaging body 1 cannot be placed stably and there is a small amount of leakage of the contents. The case where there was a large amount of leakage of the contents was marked as x.

  The suitability for use in Example 1 and Comparative Example 3 was evaluated by storing honey (50 g) inside the package. In addition, the suitability for use in Examples 2 and 3 and Comparative Examples 1 and 2 was obtained by storing 4 pieces of solid chocolate (5 g) inside the package and heating the contents with a microwave oven at 600 w for 20 seconds to dissolve the contents. Evaluation was performed. Table 1 also shows the evaluation results of suitability for use after opening and after opening.

  As is apparent from Table 1, when opening the package 1 containing the flowable contents 10, the package 1 that does not have the protruding portion 50 has a low side wall 9b and is easily deformed. Therefore, the contents 10 leaked out. When the protruding portion 50 having the inclined inner edge 50a is formed, the side wall 9b of the storage portion 9 is reinforced by the protruding portion 50 when the container 10 is used as a container after opening while preventing the contents 10 from flowing out during opening. Leakage of the object 10 could be prevented.

  On the other hand, leakage of contents occurred in the packaging bodies of Comparative Examples 1 and 3 in which the protrusions 50 were not formed. Moreover, in the package of the comparative example 2, it was difficult to place stably after opening, and a small amount of contents leaked out.

  INDUSTRIAL APPLICABILITY The present invention can be used for a package that wraps a fluid food or the like.

DESCRIPTION OF SYMBOLS 1 Package 2 Laminated film 3 Bottom surface 4a-4c Side surface 5 Bottom seal part (1st seal part)
6 Top seal part (second seal part)
7 Back seal (third seal)
DESCRIPTION OF SYMBOLS 9 Storage part 9a Opening opening 9b Side wall 9c Bottom part 10 Contents 22 Outer layer 23 Inner layer 24 Barrier layer 50 Protrusion part 50a Inner edge

Claims (9)

A package formed by a laminated film having at least an outer layer and an inner layer made of a heat-adhesive resin,
A tetrahedron-shaped storage section for storing contents;
Having a first seal part and a second seal part that thermally bond the inner layers along two opposing sides twisted by 90 ° of the storage part,
The first seal portion has protrusions protruding toward the second seal portion at both ends in the extending direction, and an inner edge of the protrusion facing the storage portion extends in the extending direction of the first seal portion. A package characterized by being inclined with respect to the package.   2. The package according to claim 1, wherein the inner edge is formed of a straight line and has an angle of 5 ° to 80 ° with respect to the extending direction of the first seal portion.   The package according to claim 1 or 2, wherein a protruding amount of the protruding portion is 3 mm or more.   The package according to claim 1, wherein the inner edge is formed of a convex curve in a direction away from the storage portion. One end portion extends from the first seal portion in a direction orthogonal to the first seal portion, and the other end portion extends from the second seal portion in a direction orthogonal to the second seal portion. It has a third seal part where the inner layers are thermally bonded together,
The package according to any one of claims 1 to 4, wherein the laminated film has easy tearability in a direction parallel to an extending direction of the third seal portion.   The package according to claim 5, wherein an opening start means is provided at a central portion in the extending direction of the second seal portion.   The package according to claim 5 or 6, wherein at least one layer constituting the laminated film is a uniaxially stretched film stretched in the extending direction of the third seal portion.   The package according to claim 7, wherein the inner layer is a uniaxially stretched film stretched in the extending direction of the third seal portion.   The package according to any one of claims 1 to 8, wherein a barrier layer having a gas barrier property is provided between the outer layer and the inner layer.

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