JP2000142720A - Flexible packaging container with ribs - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve self-standing ability and resistance to buckling while suppressing an increase in cost by folding a sheet material into a container-like form, forming a longitudinal rib heat-sealed along a corner on the corner in a longitudinal direction and forming a hollow part inside the longitudinal rib along its longitudinal direction. SOLUTION: The soft packaging container comprises side plates 1a, 1b and a bottom plate 2. A longitudinal heat seal 3 on aligned faces of the side plates 1a, 1b is formed by folding an end of one of the side plates to form a longitudinal rib 4, then interposing it between both side plates 1a, 1b, and then heat- welding. As a result, the longitudinal rib 4 is formed over a full longitudinal length along the heat seal 3a, so that a section modulus on this region remarkably increases compared to a case without the longitudinal rib 4, resistance to buckling and flexural rigidity against vertical pressure increases, and self- standing ability when the container is placed by itself in a showcase or the like is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft packaging container for containing a liquid or a fluid.

[0002]

2. Description of the Related Art As soft packaging containers for storing liquids and fluids, there are mainly pouches without spouts for storing refillable products, pouches with spouts used for drinking, box-shaped containers having a substantially rectangular parallelepiped and having a separate straw. Has been put to practical use. Functional requirements for these flexible packaging containers include sealability, quality retention, hygiene, etc., as well as independence, which has a product display effect, and buckling resistance, which prevents them from being easily crushed during transportation or drinking. , Rigidity and ease of disposal.

Conventionally, as a method of imparting self-supporting properties to a pouch without a spout (refillable pouch), the rigidity of the whole packaging container is increased by increasing the thickness of a film used as a packaging material, There has been a method of securing the stability of the entire container by indenting a part of the container or further providing a non-linear rib by a protruding mold.

[0004]

However, as described above, increasing the thickness of the entire film in order to increase the rigidity results in an increase in material cost, and the rigidity of the non-linear rib increases. In some cases, it was not enough.

Further, in a pouch with a spout,
There are problems that spouts are costly, that the spouts make it difficult to secure sealing properties, that it is difficult to reduce the volume at the time of disposal, and that incineration is a composite material and that combustion efficiency is poor.

The present invention has been devised in order to solve the above problems, and in the above-mentioned flexible packaging container, it is necessary to improve the self-sustainability and buckling resistance while suppressing an increase in cost.
Alternatively, the purpose is to eliminate the separate spout and reduce costs.

[0007]

The flexible packaging container according to claim 1 is formed by bending a sheet material into a container shape and heat-sealing the heat-sealed material, and heat-sealing the corner portion along the longitudinal direction along the corner portion. Vertical ribs are formed, and in the vertical ribs, a hollow portion is formed along the length direction, and since the vertical ribs increase the section modulus, the rigidity against bending is increased, and the bottom plate is formed. Independence, rigidity, and buckling resistance are improved regardless of the presence or absence. The flexible packaging container according to claim 2, wherein the vertical ribs are formed by folding an intermediate portion of the sheet material and heat-sealing an edge of the folded portion. The rigidity can be further improved as compared with a rib having a configuration in which a hollow portion is formed. The flexible packaging container according to claim 3 is characterized in that a flow passage for communicating the vertical rib with the inside of the flexible packaging container is provided at a bottom portion,
Since the vertical rib functions as a straw, a separate straw is unnecessary, and if replaced with a pouch with a spout, the abolition of the spout eliminates concerns about the sealing properties around the spout, and the volume at the time of disposal can be reduced. Cost can be reduced. The flexible packaging container according to claim 4 is formed in a box shape,
The upper end of the vertical rib is bent along the top plate portion from the box-shaped side plate portion and is joined to the top plate portion, and a weakened portion capable of tearing the upper end of the vertical rib and the top plate portion is formed. Since there is no protruding portion until the weakened portion is cut and the upper end of the vertical rib is raised, the straw integrally formed with the container can function without impairing the packing property. The soft packaging container according to claim 5 is characterized in that a weakened portion that can be torn to the inside of the soft packaging container is formed in the heat seal portion,
By tearing the heat seal portion along the weakened portion, an air hole is formed in the upper part of the container, and the suction of the contents is facilitated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. In the figure, a hatched portion attached to the soft packaging container indicates a heat-sealed heat-sealed portion. FIG. 1 is a perspective view according to a first embodiment of the present invention, and FIGS.
FIG. 2 is a cross-sectional view taken along the line AA in FIG. The flexible packaging container according to the present embodiment includes side plates 1 a and 1 b and a bottom plate 2. Heat seal portion 3a in the vertical direction of the mating surface of side plates 1a and 1b
Is formed by folding the end of one of the side plates to form the vertical ribs 4, then sandwiching the end between the two side plates 1a and 1b, and then heating and welding. As a result, the vertical ribs 4 are formed along the entire length in the vertical direction along the heat seal portion 3a, and the section modulus of the portion is significantly increased as compared with a conventional flexible packaging container having no vertical ribs 4. In addition, buckling resistance and bending rigidity against vertical compression force are increased, and self-sustainability when placed alone on a display shelf or the like is improved. The inner diameter of the vertical rib 4 is practically 1 to 10 mm in a container displayed at a store, and preferably about 2 to 5 mm. FIG. 2 (b) shows (a)
(A) in which both ends of one of the side plates (1a in this figure) are folded,
In (b), only one end of each of the side plates 1a and 1b is folded back, so that the two side plates are completely the same and do not require identification or the like, so that the cost can be reduced.

FIG. 3 shows an embodiment in which the vertical ribs 4 are added to the pouch having the spout 5, and the self-sustainability is improved as in the embodiment shown in FIG.

FIG. 4 shows an embodiment in which the vertical ribs 4a function as straws. Heat seal portions 3a, 3 on two sides
d, one of the heat seal portions 3d is not connected to the bottom heat seal portion 3b of the pouch, and the vertical rib 4a has a flow passage 6 for allowing the contents to flow between the inside of the pouch, The lower end 8 is connected and sealed to the bottom heat seal portion 3b, and the upper end 9 is also heat sealed. With the above configuration, the vertical ribs 4a have the flow paths 6 communicating with the inside of the pouch in a form shielded from the outside air, and function as straws by cutting the upper end 9 starting from the cuts 7 so that the consumer can enjoy the contents. An object can be sucked.

FIG. 5 shows an embodiment in which a vertical rib 14a of a box-shaped container has a function of a straw. Of the corner heat seal portions 13e and 13f, the heat seal portion 13
f is not connected to the bottom heat seal portion 13g of the box-shaped container, and the vertical rib 14a has a flow passage 16 for allowing the contents to flow between the inside of the box-shaped container and the lower end portion 18 thereof. The bottom heat seal portion 13g is connected and sealed, and the upper end portion 19 is also heat sealed. With the above configuration, the vertical rib 14a has the flow passage 16 communicating with the inside of the box-shaped container while being shielded from the outside air.
By cutting the upper end 19 starting from 7, it functions as a straw, and the consumer can suck the contents.

The straw drinking port 20 is folded together with the top plate 11 from the time of manufacture to the time of display at the store, as shown in FIG. 5B, and does not impair the packing property. Top plate 11
A weakened portion 15 for tearing and a notch 17 are provided between the rib and the vertical rib 14a. Here, the weakened portion means a perforation or a half cut, for example. At the time of drinking, the heat seal portion 13f is torn along the weakened portion 15 to raise the straw drinking port 20.

Next, a method for manufacturing the box-shaped container of the present invention will be described. FIG. 6 is a view showing a manufacturing process of a conventional box-shaped container.
After that, a vertical rib forming step shown in FIG. 7 is introduced. FIG.
Is an overall view of a rib forming process, and FIGS. 8 (a), (b), and (c).
Are AA, BB, and C-
C and (d) represent arrow D. In the vertical rib forming step, as shown in FIG. 7 and FIG.
a table 33 having an upper die 32 having a and a slit 33a of which the distance is narrowed in synchronization with the rib forming projection 32a.
By advancing with the packaging material sheet 31 interposed therebetween,
As shown in FIGS. 8A and 8B, the height of the rib is gradually increased, and in FIG. 8C, the heat seal portion 13e and the vertical rib 14 are formed by the heat welding by the seal head 35 and the pressing action of the pressing plate 34. (D), the packaging material with the vertical ribs is completed. In addition, the seal head 35a heat seals the vertical rib 14a used later as a straw,
In order to form the upstream passage 16 shown in FIG. 5, the heat seal is partially omitted. After the packaging material with ribs is completed, the product is completed through a box folding process, a heat sealing process, a filling of contents, and a final heat sealing process.

Next, an embodiment for improving the fluidity of the contents around the straw of the box-shaped container will be described. FIG. 9 shows FIG.
In the heat sealing step shown in FIG.
By inserting the core 41 into the portion, a sufficient sectional area of the flow passage 16 is ensured. It is also effective to form an emboss 42 on the side plate 12 near the flow passage 16 as shown in FIG. Further, FIG. 11 shows an example of an improvement plan for the flow path blockage due to the bending of the straw, and the vertical heat seal portion 13f
Is partially narrowed, and a wide portion 43 is provided in a hollow portion that is not sealed.

Next, an embodiment for facilitating the molding of the box container of the present application into a box will be described. FIG. 12 shows the vicinity of the bent portion of the heat seal portion 13 in the vicinity of the vertical rib 14, and as shown in FIG.
Forming 4 facilitates bending even in the heat seal portion where the packaging material overlaps.

Next, an embodiment of forming air holes for facilitating suction will be described. In the box-shaped container shown in FIG. 5, since the inside of the container becomes negative pressure by suction, it is difficult to drink the contents as it is, and it is desirable to provide an air hole near the top plate 11 of the container. FIG. 13 shows a conventional type as a straw hole, in which an air hole 47 previously opened in the top plate 11 is opened by peeling off the sealing material 46. The example shown in FIG. 14 is the weakened portion 1 on the upper surface in FIG.
5 is bent to release the heat seal portion 13f, and the top plate 11
The weakened portion 15a which is bent
When the heat seal portion 13f is cut along the top plate 11, the top plate 11
Is cut off, and this functions as an air hole. FIG. 15 shows a straw mouthpiece 20 with a weakened portion 15b inserted into the side plate 12 from the straw mouthpiece 20.
After the occurrence of zero, the portion that is further torn along the weakened portion 15b and beyond the heat seal 13f to the side plate 12 functions as an air hole. FIG. 16 shows a structure in which similar vertical ribs 14b are provided in addition to the vertical ribs 14a used as straws. An air introduction passage 16b is formed in the vicinity of the top plate 11 in place of the flow passage 16, and the lower end of the vertical rib 1
8b and the upper end 19b are heat sealed and are provided with cuts 17b. Here, the upper end 19 of the vertical rib 14a is cut off starting from the cut 17 and the upper end 19b of the vertical rib 14b is cut off starting from the cut 17b.
6b functions as an air hole to facilitate suction.

Next, a base film layer used as a packaging material for the above-described flexible packaging container will be described. As the base film layer, any sheet can be used as long as it can have quality maintaining characteristics adapted to the liquid content. For example, polyolefin resins such as polyethylene, polypropylene and polybutylene, and ) Acrylic resin, polyvinyl chloride resin, polystyrene resin, polyvinylidene chloride resin, ethylene-
Saponified vinyl acetate copolymer, polyvinyl alcohol,
Films or sheets of polycarbonate resins, fluorine resins, polyvinyl acetate resins, acetal resins, polyester resins, polyamide resins, and other various resins can be used. The film or sheet of these resins may be uniaxially or biaxially stretched, and has a thickness of 10 to 200 μm.
Is preferable, and about 10 to 100 μm is more preferable. If necessary, the film or sheet may be subjected to a surface treatment by coating the surface with an anchor coat agent or the like.

The resin constituting the heat-sealing property formed on one side (the innermost layer) or both sides (the innermost layer and the outermost layer) of the base film layer may have a quality maintaining property adapted to the liquid content. Possible, and any resin film or sheet that can be fused and mutually fused by heat can be used, and specifically,
Low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (linear) low-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-
Ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer,
Modification of polyolefin resin such as ethylene-propylene copolymer, methylpentene polymer, polybutylene polymer, polyethylene or polypropylene with unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid A resin film or sheet of an acid-modified polyolefin resin, a polyvinyl acetate resin, a poly (meth) acrylic resin, a polyvinyl chloride resin, or the like can be used. The above-mentioned film or sheet can be used in a state of a coating film of a composition containing the resin. The thickness of the film or film or sheet is 5 to
About 300 μm is preferable, and about 10 to 100 μm is more preferable. In the case of a packaging material comprising a single layer of a film having heat sealing properties, the thickness is preferably about 80 to 300 μm.

In general, packaging containers are physically and chemically subjected to severe conditions, so that the packaging material constituting the packaging containers is required to have strict packaging suitability, and has a high degree of deformation prevention strength. Various conditions such as drop impact strength, pinhole resistance, heat resistance, sealability, quality retention, workability, hygiene, etc. are required. For this reason, in the present invention, the above-mentioned various conditions are required. In order to satisfy the requirements, one to three kinds of known resin films or sheets including the above-mentioned films can be arbitrarily selected and used.

In the present invention, a method of manufacturing a laminated material using the above-mentioned materials will be described. A method of laminating a usual packaging material, for example, a wet lamination method, a dry lamination method, a solventless dry lamination method Method, extrusion lamination method, T-die extrusion molding method, coextrusion lamination method, inflation method, coextrusion inflation method, and the like. In the present invention, when performing the above-mentioned lamination, if necessary, for example, a corona treatment, pretreatment such as ozone treatment can be performed on the film, for example, urethane-based, polyethyleneimine-based, polybutadiene-based, organic titanium Anchor coating agents such as polyurethane-based, polyacrylic, polyester-based, epoxy-based, polyvinyl acetate-based, cellulose-based adhesives for laminating, etc., known coatings, anchor coating agents, adhesives, etc. Can be used.

[0021]

As described above, claim 1 or claim 2
According to the invention described in (1), a soft packaging container having excellent self-sustainability and buckling resistance can be realized at low cost without changing the thickness of the constituent materials, and as a result, the display effect is improved and the storage is improved. Efficiency can be improved. According to the third aspect of the present invention, in the pouch type container and the box type container, the straw can be formed integrally with the container, and the cost can be reduced as compared with the separate straw type. Also, when used in place of a pouch with a spout, the cost for the spout can be reduced, the seal around the spout can be eliminated, the volume at the time of disposal can be reduced, and the combustion efficiency at the time of incineration can be improved. According to the fourth aspect of the present invention, the straw integrally formed with the container can function without impairing the packing property.
According to the fifth aspect of the present invention, an air hole is formed by cutting the weakened portion of the heat seal portion, and there is an effect that the ease of drinking is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a pouch-type container.

2A is a sectional view taken along line AA in FIG. 1,
(B) is an AA of an embodiment different from (a) in FIG.
FIG.

FIG. 3 is a perspective view of another embodiment of the pouch type container.

FIG. 4 is a perspective view of another embodiment of a pouch type container.

5A is a perspective view of the box-shaped container according to the embodiment after the weakened portion is torn, and FIG. 5B is a perspective view of the box-shaped container according to the embodiment before the weakened portion is torn.

FIG. 6 is a manufacturing process diagram of a conventional box-shaped container.

FIG. 7 is a perspective view of a part of the manufacturing process of the box-shaped container of the present invention.

8A is a sectional view taken along line AA in FIG.
7B is a cross-sectional view taken along line BB in FIG. 7, and FIG.
7 is a cross-sectional view taken along line CC, and FIG. 8D is a view taken in the direction of arrow D in FIG.

FIG. 9 is a perspective view showing a method of forming a flow passage in a box-shaped container straw portion.

FIG. 10 is a front view showing one embodiment of improving the fluidity of the box-shaped container straw portion.

FIG. 11 is a perspective view showing a measure for improving the fluidity of the bent portion of the box-shaped container straw.

FIG. 12 is a perspective view showing a notch for assembling and bending a box-shaped container.

FIG. 13 is a perspective view showing the formation of air holes in the box-shaped container.

FIG. 14 is a plan view showing the formation of air holes in the box-shaped container.

FIG. 15 is a perspective view showing the formation of air holes in a box-shaped container.

FIG. 16 is a perspective view showing the formation of air holes in a box-shaped container.

[Explanation of symbols]

 3a, 13f Heat seal portion 4, 14 Vertical rib 6, 16 Flow passage 16b Air introduction passage 21 Roll material 22 Marking device 23 H2O2 tank 24 Air knife 32a Rib forming protrusion 35 Seal head 41 Core

Claims (5)

[Claims] 1. A soft packaging container formed by folding a sheet material into a container shape and heat-sealing,
A soft package, characterized in that a vertical rib formed by heat sealing along a corner portion is formed in a corner portion along the vertical direction, and a hollow portion along the length direction is formed in the vertical rib. container. 2. The flexible packaging container according to claim 1, wherein the vertical rib is formed by folding an intermediate portion of a sheet material and heat sealing an edge of the folded portion. 3. The flexible packaging container according to claim 1, wherein a flow passage for connecting the vertical rib to the inside of the flexible packaging container is provided at the bottom of the flexible packaging container. 4. In a box-shaped flexible packaging container, an upper end of the vertical rib is bent along a top plate portion from a box-shaped side plate portion and is joined to the top plate portion, and the vertical rib is joined to the vertical rib. The flexible packaging container according to claim 3, wherein a weakened portion capable of tearing off an upper end portion and a top plate portion is formed. 5. The flexible packaging container according to claim 1, wherein a weakened portion that can be torn into the flexible packaging container is formed in the heat sealing portion.