JP2007168872A - Packaging container, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging container which is easily unsealed, and to prevent the quality of a food with fluidity from being deteriorated. <P>SOLUTION: The packaging container is formed by forming a packaging material having an outermost layer and an innermost layer composed of a resin in a predetermined shape, and heating and fusion-bonding parts to be heated which are set at predetermined parts. Low-temperature fusion-bonded parts which is fusion-bonded at the temperature lower than that of other parts is formed in predetermined parts out of the parts to be heated. In this case, as the low-temperature fusion-bonded parts fusion-bonded at the temperature lower than that of other parts are formed on the predetermined parts out of the parts to be heated, the packaging container 71 is easily unsealed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a packaging container and a manufacturing method thereof.

  Conventionally, when producing a food having fluidity such as milk and soft drinks, for example, a gable-top type packaging container containing liquid food, a plate-shaped blank for one packaging container formed by die cutting, A cylindrical carton is sealed in the longitudinal direction, and the cylindrical carton is set in a filling machine.

  In the filling machine, the bottom part of the cylindrical carton is sealed to form a bottomed carton, liquid food is filled from the opening of the carton top part of the bottomed carton, and hot air is applied to the mating part formed at the top part. And the carton top portion is sealed by fusing the mating portion.

  FIG. 2 is a perspective view of a conventional gable top type packaging container.

  In the figure, 71 is a packaging container, 72 is a front wall, 73 and 74 are side walls, 75 is a rear wall, 76 and 77 are inclined upper walls formed by being inclined above the front wall 72 and the rear wall 75, 78. Is an inclined upper wall formed to be inclined above the side wall 73 (an inclined upper wall is also formed above the side wall 74), and 79 is a mating portion formed above the inclined upper walls 76 and 77. is there. Z is a fold for opening formed on each of the inclined upper walls 76 and 77 (see, for example, Patent Document 1).

  When opening the packaging container 71, put a finger on the edges eg1, eg2 on one side of the inclined upper walls 76, 77, open the triangular part from the edges eg1, eg2 to the crease z on both sides, Along with this, when the mating portion 79 is peeled off to the central bent portion 81, an inclined upper wall 78 appears. Subsequently, when the inclined upper wall 78 is peeled off, an opening can be formed at the top of the packaging container 71.

  By the way, it is necessary to peel off the inclined upper wall 78 as the packaging container 71 is opened. However, if the fusion force of the mating portion 79 is large, it becomes difficult to peel off the inclined upper wall 78. .

Therefore, a non-heated region is set at the heating portion of the mating portion 79, and the non-heated region is not heated to reduce the fusion force.
Japanese Patent Laid-Open No. 10-101003

  However, in the conventional packaging container 71, hot air is applied to a heated portion other than the non-heated region, but the hot air may hit the non-heated region, and in that case, the fusion force in the non-heated region is large. It becomes difficult to open the packaging container 71.

  In addition, it is conceivable to reduce the fusing force by applying a peeling agent instead of the non-heated area. However, when the peeling agent touches the liquid food, the quality of the liquid food deteriorates. .

  An object of the present invention is to solve the problems of the conventional packaging containers, and to provide a packaging container that can be easily opened and does not deteriorate the quality of food having fluidity, and a method for producing the same. And

  Therefore, in the packaging container of the present invention, a packaging material having an outermost layer and an innermost layer made of resin is formed into a predetermined shape, and a heating part set at a predetermined part is heated and fused. Is to be formed.

  And the low-temperature melt | fusion site | part fused | fused by the low temperature from the other part is formed in the predetermined heating site | part of the said heating site | part.

  In the manufacturing method of the packaging container of the present invention, the packaging material provided with the outermost layer and the innermost layer made of resin is molded into a predetermined shape, and the heating part set at a predetermined location of the packaging material is heated, In addition to the fusion, a predetermined portion of the heating portion is fused at a lower temperature than other portions to form a fusion suppression portion having a reduced fusion force.

  In another method of manufacturing a packaging container according to the present invention, the fusion suppression portion is formed by injecting a coolant.

  In still another packaging container manufacturing method of the present invention, the coolant is a sterile gas.

  In still another method for manufacturing a packaging container according to the present invention, the coolant is an inert gas.

  According to the present invention, in the packaging container, the packaging material having the outermost layer and the innermost layer made of resin is formed into a predetermined shape, and the heating portion set at the predetermined location is heated and fused. Is to be formed.

  And the low-temperature melt | fusion site | part fused | fused by the low temperature from the other part is formed in the predetermined heating site | part of the said heating site | part.

  In this case, since the low temperature fusion | melting site | part melt | fused by the low temperature from the other part is formed in the predetermined heating site | part of the said heating site | part, a packaging container can be opened easily.

  In addition, since it is not necessary to reduce the fusing force by applying a release agent, the quality of food having fluidity is not deteriorated.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 3 is a view showing a web-like packaging material according to the embodiment of the present invention, FIG. 4 is a view showing a main part of the front side of the blank in the embodiment of the present invention, and FIG. 5 is a blank in the embodiment of the present invention. FIG. 6 is a conceptual diagram of a packaging container forming apparatus according to an embodiment of the present invention, and FIG. 7 is a perspective view showing a molded state of a carton top portion according to the embodiment of the present invention.

  In the figure, 10 is a web-like packaging material, 15 is a blank for producing a gable-top packaging container, and the blank 15 is formed by die-cutting the packaging material 10 with a slitter. The packaging material 10 has a multilayer structure, and includes a paper base material, and an innermost layer and an outermost layer formed by coating the paper base material with a resin film. If necessary, a gas barrier layer made of a gas barrier resin, aluminum foil, or the like can be formed between the paper base and the innermost layer.

  As the resin film for forming the innermost layer and the outermost layer, a thermoplastic resin, a thermosetting resin or the like can be used, and a thermoplastic resin such as polyolefin, polyamide, or polyester is preferably used. Moreover, as said thermoplastic resin, it is preferable to use polyolefin, such as polyethylene, a polypropylene, an ethylene propylene copolymer, and polybutene-1. The polyolefin is particularly preferably polyethylene, and examples of the polyethylene include high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene (hereinafter referred to as “mLLDPE”). Polyethylene and mLLDPE are preferred.

  The blank 15 includes first to fifth panel portions P1 to P5 formed adjacent to each other, and the fifth panel portion P5 constitutes a vertical seal portion.

  The first panel portion P1 includes a rectangular portion a1 that forms the side wall of the packaging container, a rectangular portion b1 that forms the inclined upper wall of the packaging container, and a rectangular shape (not shown) that forms the bottom wall of the packaging container. And a rectangular portion d1 that constitutes the mating portion of the packaging container.

  The second panel portion P2 includes a rectangular portion a2 constituting the side wall of the packaging container, triangular portions e2, f2, g2 constituting the inclined upper wall of the packaging container, and a triangle not shown constituting the bottom wall of the packaging container. And rectangular portions k2 and m2 constituting the mating portion of the packaging container.

  Further, the third panel portion P3 includes a rectangular portion a3 that constitutes the side wall of the packaging container, a rectangular portion b3 that constitutes the inclined upper wall of the packaging container, a rectangular portion (not shown) that constitutes the bottom wall of the packaging container, and the packaging The rectangular part d3 which comprises the matching part of a container is provided.

  The fourth panel portion P4 includes a rectangular portion a4 that constitutes the side wall of the packaging container, triangular portions e4, f4, and g4 that constitute the inclined upper wall of the packaging container, and a triangle (not shown) that constitutes the bottom wall of the packaging container. And rectangular portions k4 and m4 constituting the mating portion of the packaging container.

  Further, the fifth panel portion P5 includes a rectangular portion a5 that constitutes the side wall of the packaging container, a rectangular portion b5 that constitutes the inclined upper wall of the packaging container, a rectangular portion (not shown) that constitutes the bottom wall of the packaging container, and the packaging The rectangular part d5 which comprises the matching part of a container is provided. Note that x is a mountain fold fold, and y is a valley fold fold.

  In the blanks 15 having the above-described configuration, when the first panel portion P1 and the fifth panel portion P5 are fused and sealed in the vertical direction, the blanks 15 become a cylindrical carton 16 having a rectangular cross section. When the cylindrical carton 16 is formed, the carton top portion 22 is formed by the upper rectangular portions b1, b3, d1, d3, k2, k4, m2, m4 and the triangular portions e2, e4, f2, f4, g2, g4. The carton bottom portion 23 is configured by a lower rectangular portion and a triangular portion (not shown).

  Then, operation | movement of a packaging container shaping | molding apparatus is demonstrated.

  In FIG. 6, 17 is a shaft, 18 is a boss, and the boss 18 is intermittently rotated in the direction of arrow A by a drive unit (not shown). Six mandrels 21 are arranged on the outer peripheral edge of the boss 18 so as to protrude radially outward at an equal pitch angle, and the mandrels 21 are rotated as the boss 18 rotates. They are sequentially placed at positions S1 to S6 set in the packaging container forming apparatus. The shaft 17, the boss 18, and the mandrel 21 constitute a mandrel unit.

  In the packaging container forming apparatus having the above-described configuration, when the mandrel 21 is placed at the position S1 as the loading unit, the cylindrical carton 16 is set on the mandrel 21 in the direction of arrow B by a loading apparatus (not shown). In this case, the cylindrical carton 16 is externally fitted to the mandrel 21 so that the carton top portion 22 faces the boss 18 and the carton bottom portion 23 faces radially outward.

  Subsequently, when the mandrel 21 is placed at the position S2 as the heating part, hot air is jetted from the hot air nozzle 24 as the first heating member disposed at the position S2, and the hot air blows the carton bottom part 23. The heating part set to the predetermined position of the front and back is heated, and the innermost layer and the outermost layer of the packaging material 10 are melted. For this purpose, the hot air nozzle 24 is connected to an air heating device (not shown) through a pipe 25, and hot air is generated by the air heating device.

  Next, when the mandrel 21 is placed at a position S3 as a processing portion, the carton bottom portion 23 is set in a folding device 26 as a processing means, and is bent along the folds x and y. While the mandrel 21 is moved from the position S3 to the position S4 as the pressure seal portion, the carton bottom portion 23 is further bent by the guide 27 disposed between the positions S3 and S4. When the mandrel 21 is placed at the position S4, the seal plate 30 as a seal member is advanced inward in the radial direction to form a bottom wall. In this way, the cylindrical carton 16 becomes the bottomed carton 31.

  Thereafter, the bottom wall of the bottomed carton 31 is cooled while the mandrel 21 is moved from the position S4 to the position S6 via the position S5 as a cooling unit.

  When the mandrel 21 is placed at the position S6 as the take-out portion, a suction device as take-out means (not shown) sucks the bottomed carton 31 and removes it from the mandrel 21. A conveyor 32 is disposed at the position S6, and the bottomed carton 31 removed from the mandrel 21 is sent to a filling processing unit (not shown) by the conveyor 32. In the filling processing unit, the bottomed carton 31 Liquid food is filled from the top opening.

  Subsequently, the bottomed carton 31 is sent to a heat treatment unit (not shown), in which hot air is jetted from a plurality of nozzle holes of a top sealer (not shown) as a second heating member, The heating part set to the predetermined position of the front and back of the carton top part 22 is heated, and the innermost layer and the outermost layer of the packaging material 10 are melted. Thereafter, the bottomed carton 31 is sent to a seal processing unit (not shown), and the carton top portion 22 is molded by a molding device (not shown) disposed between the heat processing unit and the seal processing unit, The top of the packaging container is formed. FIG. 7 shows a state where the carton top portion 22 is molded in the molding processing unit.

  4 and 5, the rectangular portions k2, m2, k4, and m4 are formed on the front side of the blanks 15, and the rectangular portions d1, k2, and m2 are formed on the back side of the blanks 15. , D3, k4, m4, d5 are set as the heating parts. And, the nozzle hole can apply hot air toward the rectangular portions k2, m2, k4, m4 on the front side of the blanks 15, and the rectangular portions d1, k2, m2, d3 on the back side of the blanks 15, In order to apply hot air to k4, m4, and d5, they are distributed in a predetermined pattern.

  Therefore, the rectangular portion k2 and the rectangular portion m2 are opposed to each other on the front side of the blanks 15 by the sealing device (not shown), the rectangular portion k4 and the rectangular portion m4 are opposed to each other, and the rectangular portion is fused on the back side of the blanks 15. d1 and the rectangular parts k2 and m4 are opposed to each other, the rectangular part d3 and the rectangular parts m2 and k4 are opposed to each other, and the rectangular part d1 and the rectangular part d3 are opposed to each other and fused, and the top of the bottomed carton 31 Can be sealed. Thus, a packaging container can be manufactured.

  By the way, when the packaging container is opened, if the mating part above the inclined upper wall formed by the triangular part e4 is peeled off to the central bent part, the rectangular part k2 and the rectangular part m2 Are separated, and the rectangular part d1 and the rectangular part d3 above the rectangular parts k2 and m2 are separated on the back side of the blanks 15. Subsequently, when the inclined upper wall is peeled off, the rectangular part d1 and the rectangular part k2 and the rectangular part d3 and the rectangular part m2 are separated on the back side of the blanks 15.

  However, when the bonding force at the rectangular portions d1, k2, m2, and d3 is large in the mating portion, it becomes difficult to peel off the inclined upper wall.

  Therefore, in the present embodiment, in the predetermined portion of the mating portion, in the present embodiment, the rectangular portions d1, k2, m2, and d3 on the back side of the blanks 15 are regions that suppress the fusion force, that is, the low-temperature fusion portions d11, k12, and m12. , D13 are set and formed, and the low-temperature fusion sites d11, k12, m12, and d13 are fused at a lower temperature than other portions.

  The low-temperature fusion sites k12 and m12 are formed in a predetermined area that is close to the center of the rectangular portions k2 and m2 and is 50% or more of the area of the rectangular portions k2 and m2. The fusion sites d11 and d13 are formed in the rectangular portions d1 and d3 at positions facing the low temperature fusion sites k12 and m12 with the same area as the low temperature fusion sites k12 and m12.

  In this case, since the fusion force at the low-temperature fusion sites d11, k12, m12, and d13 is suppressed and reduced, the fusion force at the rectangular portions d1, k2, m2, and d3 can be reduced accordingly.

  Next, a method for forming the low temperature fusion sites d11, k12, m12, and d13 will be described.

  FIG. 1 is a diagram showing a method for manufacturing a packaging container according to an embodiment of the present invention.

  In the figure, 31 is a bottomed carton, 22 is a carton top portion, 51 is a top sealer for heating the heating part of the carton top portion 22, and the top sealer 51 is a zenith portion 52 disposed horizontally. , And a pair of outer injection parts 53, 54 and an inner injection part 55 that are formed to hang from the zenith part 52. The outer spraying portion 53 is disposed outside the carton top portion 22 so as to face the fourth panel portion P4, sprays hot air to heat the rectangular portions k4 and m4, and the outer spraying portion 54 It is arranged outside the top portion 22 so as to face the second panel portion P2, and heats the rectangular portions k2 and m2 by injecting hot air. Moreover, the inner side injection part 55 is arrange | positioned facing the 1st-4th panel parts P1-P4 inside the carton top part 22, and injects a hot air and is rectangular part d1, k2, m2, d3, k4. , M4, d5 are heated.

  When the rectangular portions k2, m2, k4, and m4 outside the carton top portion 22 are heated in the heat treatment unit, the bottomed carton 31 is sent to the molding processing unit, and molding is started in step A, and step B Thus, the low temperature fusion sites d11, k12, m12, and d13 are cooled. Therefore, in the present embodiment, the coolant injection unit 58 as a cooling device selectively injects a low-temperature coolant at spots toward the low-temperature fusion sites d11, k12, m12, and d13. As the coolant, aseptic gas such as aseptic air, inert gas such as nitrogen gas, or a small amount of liquid nitrogen droplets is used. In the case of using liquid nitrogen droplets, vaporization is performed before or after reaching the low temperature fusion sites d11, k12, m12, and d13 after being injected by the coolant injection unit 58.

  When the aseptic gas or the inert gas is injected into the inside of the carton top portion 22, the air existing in the space above the liquid food in the bottomed carton 31 before the top portion is sealed is in a sterile state. It can be replaced by gas or inert gas. As a result, it is possible to prevent the quality of the liquid food from being deteriorated.

  In this way, when the low temperature fusion sites d11, k12, m12, d13 are cooled, the bottomed carton 31 is sent to the seal processing unit, the mating unit 59 is sandwiched by the sealing device, and the top seal is performed, A packaging container 71 is formed.

  At this time, the low temperature fusion sites d11, k12, m12, and d13 are fused at a low temperature, and the fusion force is suppressed. That is, since the fusion force at the fusion suppression sites d11, k12, m12, and d13 can be reduced, the packaging container 71 can be easily opened. Note that, in the fusion suppression portions d11, k12, m12, and d13, the fusion force is reduced, but a sealing property that can prevent the liquid food from leaking is ensured.

  Moreover, since it is not necessary to reduce the fusing force by applying the release agent, the quality of the liquid food is not deteriorated.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

It is a figure which shows the manufacturing method of the packaging container in embodiment of this invention. It is a perspective view of the conventional gable top type packaging container. It is a figure which shows the web-shaped packaging material in embodiment of this invention. It is a figure which shows the principal part of the front side of the blanks in embodiment of this invention. It is a figure which shows the principal part of the back side of the blanks in embodiment of this invention. It is a conceptual diagram of the packaging container shaping | molding apparatus in embodiment of this invention. It is a perspective view which shows the molding state of the carton top part in embodiment of this invention.

Explanation of symbols

10 Packaging material 71 Packaging containers d1, d3, d5, k2, k4, m2, m4 Rectangular portions d11, d13, k12, m12

Claims (5)

In a packaging container formed by molding a packaging material having an outermost layer and an innermost layer made of resin into a predetermined shape, heating a heating part set in a predetermined part, and fusing it,
A packaging container, wherein a low temperature fusion part fused at a lower temperature than other parts is formed in a predetermined heating part of the heating parts. (A) A packaging material having an outermost layer and an innermost layer made of resin is molded into a predetermined shape,
(B) heating and fusing the heating part set in the predetermined part of the packaging material;
(C) A method for manufacturing a packaging container, characterized in that a fusion suppression portion having a low fusion force is formed at a predetermined heating portion of the heating portions at a lower temperature than other portions.   The method for manufacturing a packaging container according to claim 2, wherein the fusion suppressing portion is formed by spraying a coolant.   The method for manufacturing a packaging container according to claim 3, wherein the coolant is a sterile gas. The method for manufacturing a packaging container according to claim 3, wherein the coolant is an inert gas.

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