JP2019206360A - Packaging container - Google Patents

Abstract

To acquire a packaging container which can pour with only a simple operation such as tilting the packaging container without allowing the outside air to enter an inner bag with contents, and in which a residual amount of the contents is small.SOLUTION: A packaging container comprises: an inner bag (2) which is formed by fusing a spout (22) having a backflow prevention function at one end of the packaging bag where sealant surfaces of a front film (211) and a rear film (212) are faced with each other and the periphery is sealed; and an outer box (1) which is outside of the inner bag, which is fitted with the spout, and which can pour the contents to the outside. In the packaging container, at least 5 percent of a gas is added and filled in the inside of the inner bag with respect to the liquid filling amount of the inner bag.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging container comprising an inner bag having a spout stopper and an outer box covering the outside thereof, wherein the residual content is reduced.

Since ancient times, it has been sold in glass bottles as containers for filling and selling liquids such as sake, soy sauce, taste phosphorus, and wine. However, glass bottles have a problem that they are heavy and easily broken, and in recent years, containers using plastics that are difficult to break even when dropped have been adopted. However, it has become necessary to reduce the amount of plastic used in response to environmental considerations and disposal properties.
On the other hand, paper boxes having a sealant layer on the inside have also been adopted, but these containers have problems such as the outside air entering the inside of the container after the contents have been poured out and the contents causing oxidative deterioration. It was.
However, in the case of a sealed flexible container, it becomes a container that squeezes out the contents, and is not suitable for an application that requires a large amount to be poured out at a time. For this reason, it is necessary to use a non-squeeze container that can be poured out by simply tilting the container, such as sake or soy sauce.
Therefore, a packaging container composed of an inner bag and an outer box mainly composed of a film has been devised.

  For example, in Patent Document 1, a container-forming plate-like member cut into a predetermined shape and size that forms a box-shaped container having a bottom wall, a top wall, and a side wall, and impermeable to liquid and gas And has the same shape and dimensions as the container-forming plate-like member, and at least the entire outer peripheral edge is fixed in a liquid-tight and air-tight manner to the assembly-joining portion of the container-forming plate-like member or a peripheral portion adjacent thereto. The container forming plate-like member is folded along each fold line defining the bottom wall, the top wall, and the side wall, and the glue part is fixed and assembled into a box-shaped container. In addition, the container-forming plate-like member is provided with a stopper mounting hole for taking out the contents and a vent for introducing air between the container and the film in contact with the inside when the contents are taken out. Proposing a sealed assembly container One, it is proposed to outlet consists of spout having attached check valve function.

Even if this sealed assembly container is a large-capacity container, it can cope with any rigidity by improving the material strength of the outer box-shaped container.
Moreover, this sealed assembly container can introduce air between a box-shaped container and a film. For this reason, by making the extraction port a stopper with a backflow prevention function, the amount of ambient air in contact with the contents is not increased, and the internal pressure is not reduced. It becomes a container that can be poured into.
However, in the case of such a non-squeeze container, there is a new problem that a large amount remains even though the contents have been poured out to the end.

Japanese Patent No. 1618165

Therefore, it is possible to obtain a packaging container that can be poured out by a simple operation such as tilting the packaging container without intruding outside air into the inner bag containing the contents, and having a small residual amount of contents. This is an object of the present invention.

The present invention has an inner bag formed by fusing a spout having a backflow preventing function to one end of a packaging bag having a sealant surface facing the front film and the rear film facing each other and sealing the periphery.
An outer box that is outside the inner bag, mates with the spout, and can pour the contents to the outside;
In a packaging container consisting of
It is a packaging container characterized by being filled by adding at least 5 percent of gas into the inner bag with respect to the liquid filling amount of the inner bag.

  The packaging container of the present invention can dispense the contents to the end simply by tilting the packaging container.

It is the longitudinal cross-sectional view which shows the embodiment of the packaging container of this invention, and its enlarged view. It is an external view which shows the example of embodiment of the packaging container of this invention. It is the longitudinal cross-sectional view which shows the stopper with a backflow prevention function and cap which are used for the packaging container of this invention, and the bottom view of a stopper. It is a top view of the inner bag used for the packaging container of this invention, and the stopper with a backflow prevention function used for it. It is a longitudinal cross-sectional view which shows the state which pours the content from the stopper with a backflow prevention function used for the packaging container of this invention, and the state which stopped pouring and the backflow of external air. It is the blank in the embodiment example of the outer box used for the packaging container of this invention.

Hereinafter, the packaging container of this invention is demonstrated in detail using figures.
FIG. 1 is a longitudinal sectional view showing an embodiment of a packaging container according to the present invention, which is composed of an outer box 1 and an inner bag 2 housed therein.
In the inner bag 2, a spout 22 having a backflow prevention function is fused to one end of the packaging bag 21 whose front surfaces 211 and 212 are opposed to each other and whose periphery is sealed.
The outer box 1 has an opening 111 in the upper mounting plate 11, the spout 22 of the inner bag 2 can be locked in the opening 111, and the packaging bag 21 can be stored therein.
For this reason, with the inner bag 2 stored in the outer box 1, the inner bag 2 communicates with the outside through the spout 22 so that the contents can be poured out. In addition, since the spout is not in close contact with the opening, ventilation can be performed inside and outside the outer box 1 so that the inside of the outer box does not have airtightness in the opening or in the vicinity of the upper surface or the bottom surface.
Normally, a cap 23 is screwed or plugged into the spout 22 as shown.

FIG. 2 is an external view showing an embodiment of the packaging container of the present invention.
One surface above the outer box 1 is used as a mounting plate 11 for the spout 22, and the mounting plate 11 has an opening 111, and is locked in a state where the top of the spout 22 protrudes from the opening 111.
In FIG. 2, the mounting plate 11 provided with the opening 111 is an inclined surface, but it may be a horizontal upper surface.
The outer box 1 may be simply a box made of paper. As an example, the blank 10 of the outer box 1 is shown in FIG. Since such an outer box 1 is not hermetically sealed, outside air can easily flow into the inner bag 2.
In addition, the outer box 1 may be a high-strength outer box provided with a sealant layer on the front and back of a paper base material and fused around the outer side, and is an outer box made of polyethylene terephthalate or polypropylene as a base material. It doesn't matter.

The shape and configuration of the plug and the packaging container body are not limited to those shown in FIGS. For example, a cap may not be provided, or instead of a cap to be screwed, a stopper type or a hinge cap may be used. Further, the packaging container may be a container stored in a cardboard box or a paper box.
The spout can be attached to a chamfered corner between the top plate and the front plate, and the spout can be fused as shown in FIG. 2, but the spout is fused directly to the top plate. It doesn't matter how.
In addition, a packaging bag in which the lower part of the spout is not a boat-shaped fusion part, but as a fusing flange, a hole for a spout is formed in the surface of the front film or the rear film, and the fusing flange is fused there. It doesn't matter.

FIG. 3 is a longitudinal sectional view showing an embodiment of the spout 22 with a backflow preventing function and an embodiment of the cap 23 used in the packaging container of the present invention, and a bottom view of the spout 22.
The spout 22 with the backflow prevention function is sandwiched between the front film 211 and the rear film 212 that constitute the inner bag 2 below, and can be fused in a sealed state. A thin boat-shaped fusion part 222 is formed.
The spout with a backflow prevention function used in the present invention is a squeeze backflow prevention function that pushes the outside of the inner bag 2 fitted with the spout 22 and opens the contents when the internal pressure is higher than the outside air, and pours out the contents. It is preferable that the non-squeeze backflow preventing function be opened by tilting the entire container.

The pouring path 221 has a first channel 2211 having a small diameter on the lower side and a second channel 2212 having a larger diameter on the upper side, and has a tapered portion 2213 inclined in the middle thereof.
The tapered portion 2213 has a spherical valve body 226, and the valve body 226 has a diameter larger than the diameter of the first flow path 2211 and smaller than the diameter of the second flow path 2212.
The valve body pressing part 223 is locked on the upper side of the second flow path 2212, and the claw 2231 provided on the inner diameter side of the valve body pressing part 223 prevents the valve body 226 from jumping to the dispensing side. Yes. For this reason, the valve body 226 is loosely inserted in the vicinity of the tapered portion 2213.
A trumpet-shaped pour tube tip 2232 is formed on the upper side of the valve body pressing portion 223, and when the contents are poured out, the pour tube is easy to run out of liquid, and the contents adhere to the tip of the spout 22; I try not to solidify.

A cylindrical portion 224 is provided around the second flow path 2212. In this drawing, a screw portion 2241 that is screwed into the cap 23 is provided on the outer surface.
In addition, a flange 225 is formed below the screw portion 2241 through a gap 2251 in which a mounting plate that forms an opening of the outer box can be inserted between the boat-shaped fusion portion 222 and the boat-shaped fusion portion 222.

FIG. 4-1 is an inner bag used for the packaging container of the present invention.
The inner bag 2 is a bag having a shape and size matched to the outer box 1. A packaging bag in which the sealant surfaces of the front film 211 and the rear film 212 face each other and the periphery of the top seal 213, the left seal part 214, the right seal part 215, the bottom seal part 216, and the shoulder seal part 217 is sealed. A spout 22 having a backflow prevention function is fused to one end of the shoulder seal portion 217 with the front film 211 and the rear film 212 so as to sandwich both sides of the boat-shaped fusion portion.
The inner bag 2 may be the inner bag without the shoulder seal portion 217, and the spout 22 is fused to the top seal portion 213 so as to sandwich both sides of the boat-shaped fusion portion.

4-2 is a plan view of the spout 22 with a backflow prevention function used for the inner bag 2 as viewed from above.
In this figure, the valve body 226 is loosely fitted by the three claws 2231 of the valve body pressing portion 223. There are two or more nails 2231, preferably three or more.

FIG. 5 shows a state in which the contents 4 are poured out from the spout 22 with a backflow prevention function used in the packaging container of the present invention, and a state in which the pour is stopped and the outside air is stopped from flowing back. It is a longitudinal cross-sectional view showing an example of the outlet 22.
When the container is tilted and the spout 22 is directed downward, the valve body 226 is separated from the tapered portion 2213 as shown in FIG. 5-1, the first flow path 2211 and the second flow path 2212 are connected, and the contents are flow paths. It flows through 221 and pours out from the pour tube tip 2232.
Since there is a gap between the claw 2231 and the valve body 226, the contents flow out.

When the inclination of the container is changed and the spout 22 is directed in the horizontal direction, as shown in FIG. 5B, the contents return to the inside of the container, and the valve body 226 is drawn toward the inside of the container.
The valve body 226 contacts the tapered portion 2213 of the flow path 221, and the first flow path 2211 and the second flow path 2212 are blocked.

When the inclination of the container is changed and further raised and the spout is directed upward, the contents return to the inside of the container as shown in FIG. 5-3, and the valve body 226 is strongly pulled toward the inside of the container.
The valve body 226 strongly abuts against the tapered portion 2213 of the flow path 221 and the content tends to move to the bottom side.
Then, the first flow path 2211 and the second flow path 2212 are blocked, and the contents move downward, so that a negative pressure is generated inside the inner bag and the front film and the rear film are drawn together. Outside air enters between the outer inner bag 2 and the outer box 1.

FIG. 6 is a blank in the embodiment of the outer box used for the packaging container of the present invention.
An opening 111 is opened in the mounting plate 11 to which the spout 22 is attached. The opening has a shape in which a hole having a size for allowing the flange of the spout to pass therethrough and a hole capable of locking the flange overlap each other.
A front plate 12 is secured to the lower side of the mounting plate 11 via a ruled line, and a left plate 13 is secured to the left side of the mounting plate 11 via a ruled line. Are connected via ruled lines.

The left plate 13 has a body part margin 131 on the left, an upper left insertion plate 132 and a left inclined insertion plate 133 on the upper side, and a left bottom plate 134 on the lower side through a ruled line.
The right plate 14 has an upper right insertion plate 141 and a right inclined insertion plate 142 connected to each other via a ruled line.
A front bottom plate 121 is connected to the lower side of the front plate 12, a right bottom plate 143 is connected to the lower side of the right plate 14, and a rear bottom plate 151 is connected to the lower side of the rear plate 15 through ruled lines.

Further, a left pasting tab 1341 is connected to the left bottom plate 134 and a right pasting tab 1431 is connected to the right bottom plate 143 via a ruled line, and the left pasting tab 1341 is attached to the rear bottom plate 151 and a right pasting tab. 143 is affixed to the front bottom plate 121 with an adhesive or the like.
When the container is raised, the bottom portion is engaged with the left bottom plate 162 and the right bottom plate 163 to form the bottom portion.

  In the upper part, the upper left insertion plate 132 and the left inclined insertion plate 133, the upper right insertion plate 141 and the right inclined insertion plate 142 are folded inwardly, and the rear top plate 16 is locked above the rear plate 15. The mounting inner plate 161 is locked via a ruled line.

The spout 22 is inserted into the slit 162 of the mounting inner plate 161, and the mounting inner plate 161 is inserted into the gap 2251 below the flange 225 of the spout 22.
Furthermore, the attachment plate 11 is inserted into the gap 2251 of the spout 22 from the front plate 12 side and outside the attachment inner plate 161.
The top plate 112 is secured to the end of the attachment plate 11 via a ruled line, and the insertion portion 113 is provided at the end of the attachment plate 11, and the insertion plate 160 is provided between the rear top plate 16 and the rear plate 15. The outer box 1 is assembled by being inserted.
Of course, the outer box shown in FIG. 6 is an example of the embodiment, and may not necessarily be such an assembly box but may be one in which the bottom is fused and folded.
In the embodiment shown in FIG. 6, chamfered ruled portions are provided on the left and right sides of the front plate 12.
However, it is necessary to be an outer box that allows outside air to easily flow between the outer box 1 and the inner bag 2.

The basic structure of the laminated film constituting the packaging container of the present invention may be a film composed of a base material layer on the outside and a sealant layer on the inside, but as an intermediate layer, a barrier layer that improves the storage stability of the contents In addition, it is preferable to provide a layer that gives flexibility such that the bag is not easily broken when dropped.
In particular, since it is necessary to enclose a gas of 5% or more of the contents in the inner bag, it is necessary to have a barrier property that prevents the gas from permeating or flowing out of the inner bag.
At the same time, it is necessary that the inner bag is made of a material that the gas does not adsorb.

  Examples of the base material layer include a polyester film, a polypropylene film, a polystyrene film, a nylon film, a polycarbonate film, a polyacrylonitrile film, and a polyimide film. There is no particular limitation as long as it has mechanical strength and dimensional stability. A biaxially stretched film is particularly preferable. Moreover, what provided the aluminum vapor deposition layer in these films may be used.

  As the sealant layer, polyolefin resin is generally used. Specifically, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer (EVA), Polyolefin resins such as ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EAA), ionomer, and polypropylene can be used. These resins can be formed into a film by an extruder such as a T-die or inflation. It may be a single layer or multiple layers. The thickness of the film is preferably in the range of 50 to 200 μm.

  As the adhesive layer, an adhesive for dry lamination can be used. For example, a two-component curable urethane adhesive, a polyester urethane adhesive, a polyether urethane adhesive, an acrylic adhesive, a polyester adhesive, a polyamide adhesive, an epoxy adhesive, and the like can be used. . As a bonding method, a dry laminating method can be used, but it may be bonded while forming a film on the sealant layer side with an extruder lamination machine, or may be processed by sand polyethylene.

Further, in order to keep the gas in the inner bag, it is necessary to improve the barrier property. For example, the barrier property can be ensured by using an aluminum foil, an aluminum vapor-deposited polyester film, an inorganic oxide vapor-deposited polyester film, a polyamide resin, or the like as the intermediate layer.
Furthermore, when improving the puncture strength, low temperature drop, etc., a layer of polyamide resin or the like may be provided in the intermediate layer.
In order to laminate the intermediate layer, it can be bonded by a dry laminating method through an adhesive layer.

Examples of inorganic oxides that improve barrier properties include silicon oxide, aluminum oxide, magnesium oxide, calcium oxide, potassium oxide, tin oxide, sodium oxide, boron oxide, titanium oxide, lead oxide, zirconium oxide, and yttrium oxide. Oxides can be used. Of these, silicon oxide, aluminum oxide, magnesium oxide and the like are preferable from the viewpoint of productivity and price.

<Examples 1-4>
As the inner bag, a packaging bag having a length of 280 mm and a width of 160 mm shown in FIG. 1 was used.
The inner bag is composed of silicon oxide-deposited polyethylene terephthalate film 12 μm / polyamide film 15 μm / low density polyethylene 30 μm / extruded low density polyethylene 15 μm / linear low density polyethylene 20 μm / cyclopolyolefin film 10 μm / linear low density. The polyethylene was 10 μm.
The outer box had the shape shown in the blanks of FIGS. 2 and 6, and was formed into a size of 260 mm in height, 105 mm in length, and 60 mm in width by G-stage bonding of 270 g / m ² of coated balls.
The spout is an injection molded product of high density polyethylene, the inner diameter of the first flow path is 6 mm, the inner diameter of the second flow path is 10 mm, the taper angle A of the taper part is 55 degrees, and the average surface roughness (Ra ) Was 0.30 μm, the valve body was made of polypropylene, the diameter of the valve body was φ8 mm, the valve body density was 0.91 g / cm ³ , and the shape shown in FIG.
The valve body holding part used had a shape shown in FIG. 3A with an inner diameter of 8.7 mm and three claws extended inward by 2.3 mm.
The gap B between the upper end of the first flow path and the lower end of the claw of the valve body pressing part was 9 mm.
The contents were sake and the gas to be trapped was air.
In Examples 1 to 3, 720 mL of sake was filled into the inner bag from the upper end of the packaging container, and the top seal was fused and closed.
At this time, the amount of air trapped inside the inner bag was 180 mL in Example 1, 90 mL in Example 2, 60 mL in Example 3, and 40 mL in Example 4.

<Comparative Examples 1-2>
The same inner bag and outer box as in Example 1 were used.
The contents used sake and the gas used air.
In Comparative Examples 1 and 2, 720 mL of sake was filled into the inner bag from the upper end of the packaging container, and the top seal was fused and closed.
At this time, the amount of air trapped inside the inner bag was 30 mL in Comparative Example 1 and 0 mL in Comparative Example 2.

<Comparative Example 3>
A paper pack container with a capacity of 1800 mL (width 87 mm, depth 87 mm, height 300 mm) was used without an inner bag, and the plug portion was replaced with the same plug as described above for verification.
In Comparative Example 3, 1800 mL of sake was filled and sealed.

<Evaluation method of gas amount and residual amount during filling>
The cap of the spout was removed, the outer box was grasped by hand, and the spout was placed at an angle facing downward.
Sake was used for the contents and air was used for the gas so that the spout faced downward.
In Examples 1-3 and Comparative Examples 1-2, 720 mL of sake was filled into the inner bag from the upper end of the packaging container, and the top seal was fused and closed.
In Comparative Example 3, 1800 mL of sake was filled.
At this time, the amount of air trapped inside the inner bag is 180 mL in Example 1, 90 mL in Example 2, 60 mL in Example 3, 40 mL in Example 4, 30 mL in Comparative Example 1, and 0 mL in Comparative Example 2. did.

<Evaluation results of gas amount and residual amount during filling>
In Examples 1 to 4, the remaining amount after ejection is less than 5% (Example 1 is 0.6%, Example 2 is 1.8%, Example 3 is 3%, Example 4 is 4.%). 7%) Good results.
The comparative example 1 was 7 percent, the comparative example 2 was 11 percent, and the residual amount was large.
When it was in a sealed state between the inner bag and the outer box of Comparative Example 3, a very large amount of residue was generated.

  According to the above evaluation results, it is preferable that 5% or more of the gas is allowed to flow in during filling. An inert gas such as nitrogen gas is preferable because the gas at the time of filling needs to react with the contents so as not to decrease.

The packaging container of the present invention is as described above, and is a packaging container capable of stably dispensing a large amount of contents simply by tilting the packaging container.
Furthermore, after pouring out the contents, if the packaging container is kept in a standing state, it is possible to suppress the inflow of outside air and the deterioration of the contents. The merit of the plug of the present invention and the packaging container having the plug is great, such as being able to suppress deterioration.

1 ... Outer box 10 ... Blank 11 ... Mounting plate 111 ... Opening 2 ... ... Inner bag 21 ... Packaging bag 211 ... Front film 212 ... Rear film 213 ... Top seal 214 ...・ ・ ・ ・ Left seal 215 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Right seal 216 ・ ・ ・ ・ ・ ・ Bottom seal 217 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder seal 22 ・ ・ ・ ・ ・ ・ Note Outlet 221... Extraction path 2211... First flow path 2212... Second flow path 2213. Boat-shaped fused portion 223 ··· Valve body pressing portion 2231 ··· Claw 2232 ··· Discharge tube tip 224 ···················・ ・Threaded portion 225 ....... flange 2251 ......... gap (mounting plate fitted possible clearance)
226 ... Valve 23 ... Cap 4 ... Content A ... Taper angle B ... .... Gap (gap between first channel inlet and claw)

Claims (3)

An inner bag formed by fusing a spout having a backflow prevention function to one end of a packaging bag having a sealant surface facing the front film and the rear film facing each other, and sealing the periphery;
An outer box that is outside the inner bag, mates with the spout, and can pour the contents to the outside;
In a packaging container consisting of
A packaging container, which is formed by adding at least 5 percent of the gas in the inner bag to the liquid filling amount of the inner bag.   The packaging container according to claim 1, wherein the gas filled in the inner bag is composed of an inert gas.   The packaging container according to claim 1 or 2, wherein the inner bag is formed of a film having a barrier layer with low oxygen permeability.

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