JPH1149236A - Liquid packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a body-swelling of the side wall of an external box from arising by a method wherein the length of the apparent outer periphery of an internal cylinder is made approx. the same length as the length of a circle which inscribes the internal dimension of the external box, and the height direction of the internal cylinder is made a height which does not exceed the internal dimensional height of the external box. SOLUTION: For this liquid packaging container R1, in an approx. equilateral square external box A1 comprising body parts A11, A13, a cylindrical internal cylinder B1 made of one-sided corrugated fiberboard sheet is fitted. The internal cylinder B1 is formed by bonding both ends of the one-sided corrugated fiberboard sheet, and the length of the outer periphery of the cylindrical shape is made approx. the same as the length of the circumference which inscribes the external box A1. In the liquid packaging container R1, an internal bag P1 made of a plastic being rich in flexibility is housed. The outer peripheral length of the internal cylinder B1 is approx. the same length as the length of the circumference which inscribes the external box A1. By this method, a body swelling of the liquid packaging container R1 can be prevented from arising.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging container in which an inner bag or the like containing liquid or fluid powder or granules (hereinafter referred to as "liquid or the like") is stored in an outer box.

[0002]

2. Description of the Related Art Conventionally, when storing or transporting a liquid or the like, there is a liquid packaging container in which the liquid or the like is stored in a plastic inner bag or the like, and the inner bag is further stored in a cardboard or paperboard outer box. in use. These liquid packaging containers are called back-in-boxes, and their demand is expanding because they are lighter in weight than drums and the like, and are easier to dispose of.

[0003] In the liquid packaging container as described above, the internal pressure of the liquid or the like in the inner bag is directly applied to the inner wall of the outer box. There was a problem that a box had to be used. That is, if the strength of the side wall of the outer box is not sufficient, there arises a problem that the side wall curves outward, that is, a so-called bulge or the side wall buckles when products are stacked. To solve this problem,
U.S. Pat. No. 4,056,223 discloses a storage container provided with reinforcing members to increase strength.

However, also in this liquid packaging container, since the internal pressure of the inner bag is directly applied in the direction of expanding the side wall, the blister on the side wall cannot be fundamentally solved. Therefore, it is necessary to use a strong outer box also in this storage container. By the way, such a high-strength outer box has a high manufacturing cost, and cannot be easily folded when discarded, and is difficult to dispose.

Japanese Patent Application Laid-Open No. Hei 7-315436 discloses that the bottom 4
A rectangular paper inner cylinder made of cardboard or paperboard is disposed inside a paper outer box having four side walls connected to sides, and one side of the inner cylinder is connected to the outer box by After arranging obliquely between adjacent side walls, and fixing both ends of the oblique side to the inner surface of the adjacent side wall, a flexibility equal to or larger than the diameter of the inner cylinder is provided inside the inner cylinder. It features a soft plastic inner bag provided.

However, the internal pressure of the inner bag housed in the liquid packaging container pushes and spreads the side not joined to the inner cylinder, but also pushes the side of the inner cylinder joined to the outer box. That is, since it is applied in the direction of expanding the inner wall of the outer box, the blister of the side wall cannot be fundamentally solved. In addition, since it is an essential condition that the outer box and the inner cylinder are joined with an adhesive or the like, the actual process of box making becomes complicated, and mass production requires automatic box making. Requires a dedicated high-precision machine. Therefore, it is not suitable as a large-capacity liquid packaging container.

[0007] Japanese Patent Application Laid-Open No. 8-282735 discloses a square outer box having a bottom part and a lid and a body part formed of four outer plates, an n-sided frame mounted inside the outer box, An attempt is made to prevent blistering by sandwiching a support plate between a side wall of the frame and a side wall corresponding to the frame of the outer box. However, since the internal pressure of the inner bag of the liquid packaging container is applied in a direction in which the inner wall of the outer box is pushed and spread through the supporting plate sandwiched between the side wall of the frame and the inner bag, the blisters on the side wall of the outer box are fundamentally removed. It cannot be solved. Therefore, it is necessary to use a high-strength outer box also in this liquid packaging container.

The blister amount of the liquid packaging container depends on the stacked load and the internal pressure of the liquid or the like stored in the container, but the influence of the internal pressure is particularly large. In other words, even if the container does not cause blistering with a general stacking load,
Blistering occurs when liquid is stored. In addition, blistering tends to occur as the size and capacity of the container increase.
That is, since the bending strength of a plate such as a corrugated cardboard sheet is inversely proportional to the distance, as the capacity of the container increases, the liquid packaging container requires a higher strength container.

[0009]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a liquid packaging container which can prevent a blister on the side wall of an outer box even when a product generating internal pressure is stored. .

[0010]

That is, a first invention of the present invention is a liquid container for storing an inner bag filled with a liquid or the like, wherein a body having a bottom and a lid has four side walls. And a liquid packaging container formed of a cylindrical inner cylinder made of paper to be mounted inside the outer box, wherein the apparent outer peripheral length of the inner cylinder is The present invention relates to a liquid packaging container having a length substantially equal to a length of a circle inscribed in the inner size of the outer box, and a height of the inner cylinder not exceeding the inner size height of the outer box.

[0011] In a second aspect of the present invention, the inner cylinder comprises:
The liquid packaging container according to claim 1, which is a single-sided cardboard made of any one of the flutes of A, B, C, and E, and the flute direction of the single-sided cardboard is vertical.

According to a third aspect of the present invention, an apparent outer peripheral length of the inner cylinder or the square inner cylinder is smaller than 110% of a length of a circle inscribed in an inner dimension of the outer box. 4. A liquid packaging container according to 1 or 3.

According to a fourth aspect of the present invention, there is provided a liquid container for storing an inner bag filled with liquid or the like, wherein the body having a bottom and a lid has a substantially square shape having four side walls. An outer box, a liquid packaging container formed of a cylindrical square inner cylinder made of an eight- to sixteen-sided polygon made of a cardboard sheet mounted inside the outer box, wherein the flute of the cardboard sheet is The square inner cylinder is disposed so as to be orthogonal to the top and bottom directions, and the apparent outer circumference of the square inner cylinder is substantially the same as the length of a circle inscribed in the inner size of the outer box, A liquid packaging container whose height direction does not exceed the inner height of the outer box.

The fifth invention of the present invention relates to the liquid packaging container according to the fourth aspect, wherein the square inner cylinder is made of a double-sided cardboard, a double-sided cardboard, and a double-sided cardboard again.

In a sixth aspect of the present invention, the sum of the outer circumferences of the sides of the square inner cylinder corresponding to each side of the side wall of the outer box is equal to the length of the inner dimension of each side of the side wall of the outer box. 4. The method according to claim 3, wherein the ratio is less than 95%.
Or a liquid packaging container according to item 5.

According to a seventh aspect of the present invention, there is provided the liquid packaging container according to any one of the first to sixth aspects, wherein an aspect ratio of an inner dimension of the outer box does not exceed 1.2.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a method for forming an outer peripheral length of a circle inscribed around an inner dimension of an outer box of a square outer body of a cardboard box such as a type A or a type C formed of a cardboard sheet or the like. A paper sheet of approximately the same length as the above is folded into a cylindrical or polygonal cylinder and attached as a square cylinder, and the internal pressure from the inner bag is absorbed by the cylinder etc. to prevent the outer box from bulging Is what you do. In the present invention, the apparent outer peripheral length of a cylindrical inner cylinder or a square inner cylinder is a case where the outer circumference of these inner cylinders is measured with a tape measure so as to measure the outer peripheral length of a cylinder without considering its irregularities. Is the length of In this case, only the length of the hypotenuse of the triangle is measured at the step portion of the bonded portion, and the length is not exactly the length of the step portion of the bonded portion.

In a so-called liquid packaging container in which a liquid or the like is put in a soft packaging bag such as a plastic bag and stored in a packaging container made of a cardboard sheet, the side wall of the container is pushed outward due to the internal pressure of the stored liquid or the like. , Bulging easily. A blistered container has a weaker compressive strength, which further promotes blistering. Therefore, it is the most general method of reinforcing the side wall by using a so-called double structure in which the inner box is mounted inside the outer box to prevent the blister from bulging. However, this method also does not prevent fundamental blistering because the internal pressure directly affects the side wall of the outer case via the side wall of the inner case.

One element of the present invention is that the inner cylinder or the like is formed of a paper sheet having a length substantially equal to the length of the circumference inscribed in the inner size of the outer box. . Generally, the elongation ratio of paper sheet to tension is relatively small, and therefore the elongation to internal pressure of a liquid or the like stored in a liquid packaging container is small and almost negligible. For this reason, if a plastic bag containing liquid, etc., is stored in a cylinder, etc., having a length almost the same as the circumference inscribed in the inner size of the outer box, the inner cylinder will be exposed to the internal pressure of the liquid, etc. It swells in a columnar shape that is almost a perfect circle, but does not swell any further due to the drag of the inner cylinder or the like. In other words, if the inner cylinder or the like has a shorter outer circumference than the circumference inscribed in the inner dimension of the outer box, and the inner cylinder or the like has strength greater than the internal pressure stress, the internal pressure stress is also reduced. As a result, if the elongation of the inner cylinder or the like is negligibly small, the internal pressure is absorbed by the inner cylinder or the like and does not affect the blister of the outer box.

Further, the height in the height direction of the inner cylinder or the like does not exceed the inner height of the outer box. If the height of the inner cylinder is higher than the inner dimension height of the outer box, when the flap of the outer box is bent, the flap will be obstructed by the inner cylinder etc. and cannot be bent. Etc. are crushed.

Further, by forming the inner cylinder and the like from a sheet made of paper, it is possible to mass-produce at low cost.

Another invention is that the inner cylinder is made of one-sided cardboard, and the flute direction of the one-sided cardboard is used in the vertical direction. A single-sided cardboard is made by laminating a corrugated core to one side of a single liner, and is in the process of producing a double-sided cardboard. Waveforms are commonly called flutes,
A single-sided cardboard having a liner on only one side of the flute can be rolled freely in the direction parallel to the flute. The liner bonded to the flute has a basis weight of 150.
g of base paper of about g or more, and the elongation when the liner is subjected to tensile stress is extremely small and negligible. Further, the tensile strength of the liner in the vertical direction is several kgf or more in a width of 15 mm, and when the height of the inner cylinder is 30 cm, the tensile strength is 200 kgf or more. Therefore, the inner cylinder made of single-sided cardboard can completely absorb the internal pressure of the inner bag.

Another advantage of using the single-sided cardboard is that the flute step height of the single-sided cardboard serves as a cushioning material, and the buffering effect reduces the sudden increase in internal pressure due to various impacts, thereby preventing buckling and crushing of the outer box. As a result, the outer box can be protected from blistering. That is,
Since the flute serves as a cushioning spacer between the outer case and the inner bag, the outer case can be protected from fluctuations in the internal pressure due to vibrations and shocks during transportation by trucks or ships.

Another element in the present invention is that the single-faced cardboard is made of any one of A flute, B flute, C flute and E flute. The A flute has a wave step height of about 5 mm and has a cushioning property when subjected to an impact, and can absorb vibration when a liquid packaging container is transported and shock when a product is unloaded and loaded. B-flute and C-flute have a low step height, and the ability to absorb vibration and shock is A
Although not as good as flutes, the number of flutes per unit length is large, and as a result, the ability to absorb internal pressure is excellent. Further, since the E-flute has a step height of only about 1 mm, the actual volume after the inner cylinder is mounted is large, which is often advantageous depending on the size and volume of the liquid packaging container. That is, these flutes are actually produced, and can be selected according to the type of liquid or the like, the size of the box, the transport method, and the like.

Another aspect of the present invention is that the outer circumference of the cylinder corresponding to the inner circumference of the outer box has a length of 1 to the inner circumference of the outer box.
That is, less than 10%. If the outer circumference of the cylinder is shorter than 100% of the inner circumference of the outer box, the circle becomes theoretically smaller than the circle inscribed on the side wall of the outer box. The outer box does not swell due to the internal pressure of the inner bag because the side wall of the outer bag is not pushed. For this reason, shortening the outer circumference of the cylinder is advantageous for preventing the outer case from bulging, but it is necessary to increase the outer circumference of the inner cylinder within a range that does not cause the swelling because the storage volume of the container is actually reduced. There is. If the outer peripheral length of the cylinder exceeds 110% of the inner circumference of the outer box, the contact ratio between the side wall of the outer box and the side wall of the cylinder increases, and the degree to which the expansion of the side wall of the cylinder affects the expansion of the outer box. Undesirably increases.

Another aspect of the present invention is that an inner cylinder is provided with an octagonal or a 12
By mounting the outer case as a square inner cylinder with a square or hexagonal shape, it is possible to prevent the outer case from bulging.

Although the internal pressure acts to spread the square cylinder, the bending strength of the inner cylinder is greatly improved by folding the corrugated cardboard sheet into a polygonal square. In addition, since the container is a double-walled cardboard box that uses a cardboard sheet for both the outer box and the square cylinder, the pressure resistance is greatly improved, and it can be used as a large liquid packaging container. Can be stacked in two tiers.

Another element of another invention is that the flute direction of the square cylinder is arranged perpendicular to the top and bottom. As a result, the bending strength of the square cylinder is significantly improved, so that the square cylinder can be prevented from expanding outward due to internal pressure. The swelling is also absorbed in the gap provided between the cylindrical side walls, and the influence of the internal pressure on the side wall of the outer box is extremely small, so that no blistering occurs in the outer box. The number of side walls of the square cylinder is 8, 12, or 16 and is a multiple of four. This is because the outer box is composed of four side walls, and unless the side wall of the square cylinder is a multiple of 4, the side wall of the square cylinder does not correspond to the shape of the side wall of the outer box. When the number of the side walls of the square cylinder is four, the length per one side wall of the square cylinder is almost the same as the size of the outer box. Therefore, the effect of improving the bending strength is not so large. When the number of the side walls of the square cylinder is 16, the width per side wall becomes sufficiently small, and it is not necessary to increase the number of side walls any more.

Further, the present invention is that the corrugated cardboard sheet used for the square inner cylinder is any one of a double-sided corrugated cardboard sheet, a double-sided corrugated cardboard, and a double-sided corrugated cardboard. The volume required for the liquid packaging container ranges from a small capacity within 10 liters to a large container exceeding 1 cubic meter, and the container is required to have strength corresponding to each capacity. For this reason, the liquid packaging container is made from a box made of a normal double-faced corrugated cardboard sheet of B flute or A flute, 2A,
A high-strength cardboard box such as double-sided corrugated cardboard such as 3A and double-sided corrugated cardboard is required. Similarly, for the corrugated cardboard sheet used for the square inner cylinder, it is necessary to select the type of corrugated cardboard sheet according to the contents and the capacity to be stored.

Another element of the present invention is that the sum of the outer perimeters of the sides of the square inner cylinder corresponding to each side of the side wall of the outer box is 95% of the inner length of each side of the side wall of the outer box. It is smaller. When the sum of the outer dimensions of each side of the square cylinder is less than 80% of the length of the inner dimension of each corresponding side wall of the outer box, the length becomes substantially the same as the circumference inscribed in the side wall of the outer box, and As a result, the actual capacity of the outer box becomes small, and it cannot be said that it is advantageous. However, the swelling of the outer box can be almost completely prevented. Conversely, when the total length of the outer dimensions of each side of the square inner cylinder exceeds 95% of the inner dimension of each side wall of the corresponding outer box, the side wall of the outer box and the square Since there is almost no gap between the side wall of the cylinder and the swelling of the side wall of the square cylinder which affects the swelling of the outer box, it is not preferable. Not preferred.

Another aspect of the present invention is a liquid packaging container characterized in that the aspect ratio of the inner dimensions of the outer box does not exceed 1.2. When the aspect ratio of the inner dimensions of the outer box is 1 to 1, the inscribed circle is a perfect circle. As the inner bag of the liquid container, a flexible plastic bag is used. When the inner bag is filled with liquid or the like, the inner bag becomes substantially a perfect circle due to the internal pressure. When the inner bag has a shape close to a perfect circle due to the internal pressure, the outer box is also a square-shaped box, which is effective in preventing bulging of the body, and the outer cylinder has an outer cylinder inscribed in the outer box. Bulking can be prevented most effectively when the length is shorter than the length.

However, the type of the inner bag of the liquid packaging container is generally made from a pillow type bag. The shape of the pillow-type bag after the liquid is filled is likely to take the shape of a pillow (pillow) due to the influence of the sealing portion of the bag, and the cross-sectional shape is not a perfect circle but a shape close to an ellipse. Therefore, the cross-sectional shape of the container is slightly more rectangular than a regular square, which is more practical. However, when the inner bag is stored in a box, the aspect ratio is 1.2.
Hardly ever exceed. Therefore, it is preferable that the aspect ratio of the box storing the inner bag does not exceed 1.2. When the aspect ratio of the box exceeds 1.2, the area ratio where the side wall of the inner cylinder contacts the side wall of the outer box increases, and the inner pressure of the inner bag pushes the side wall of the outer box through the side wall of the inner cylinder, It is not preferable for the blister of the outer box.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1, 2, 6, and 7 are perspective views of the present invention during assembly, and FIGS. 3 and 8 are outer boxes A of the present invention.
4 and FIG. 9 are development views of the cylindrical inner box of the trunk portion of the present invention. FIG. 5 is a sectional view of FIG. 1 and FIG. 10 is a sectional view of FIG. Is shown.

As shown in FIGS. 1 and 2, the liquid packaging container R1 of the first embodiment has a body portion of A11, A12, A13, A14.
A single-sided cardboard cylindrical inner cylinder B1 is mounted on a substantially square outer box A1 made of Further, the outer box A1 is a wrap round type cardboard box, and is manufactured by a normal method. FIG. 3 is a development view of the outer box A. The inner cylinder B1 is formed by joining both ends of a single-sided corrugated cardboard sheet, and the length of the outer periphery of the cylinder is substantially the same as the length of the inscribed circumference of the outer box A1. FIG. 4 is a development view of the inner cylinder B1.
A plastic inner bag P1 filled with flexibility and sealed with a liquid or the like is stored in the liquid packaging container R1. FIG. 5 is FIG.
FIG. 3 is a cross-sectional view of the liquid package container R1 taken along the line YY, which is manufactured so that gaps S1 are formed between the outer box A1 and the respective side walls of the inner cylinder B1. The inner bag P1 takes a cylindrical shape when housed in the inner cylinder by the internal pressure of a liquid or the like.
Further, the side wall of the inner cylinder B1 is also expanded into a cylindrical shape by the internal pressure of the inner bag P1, but the outer peripheral length of the inner cylinder B1 is substantially the same as the length of the circumference inscribed in the outer box A1. Is made of a material with small elongation like a single-sided cardboard, so that the side wall of the inner cylinder B1 does not spread any more. In addition, inner cylinder B
Since the liquid packaging container R1 is absorbed by the gap S1 even if it slightly expands, the liquid packaging container R1 does not bulge as a result.

The outer dimensions of the inner cylinder B1 in which the liquid packaging container R1 does not swell, the length of the circle inscribed in the outer box A1 is 11
Less than 0%. 110% outer circumference of inner cylinder B1
When the length is longer, the contact area between the side wall of the inner cylinder B1 and the side wall of the outer box A1 increases. As a result, the internal pressure applied to the side wall of the outer box increases, and the side wall of the outer box A1 is pushed open. Therefore, in order to prevent body swelling, a strong box must be used for the outer box A1, which is not economical. The dimension of the inner cylinder B1 in the height direction is preferably a height that holds the inner flap when the flap of the outer box A1 is closed. A height that is sufficient to support the inner flap is a preferable height because the total compressive strength of the box is improved. The height of the inner cylinder B1 is box A
If the height of the inner bag 1 is lower than 60%, the effect of absorbing the internal pressure of the inner bag P1 is reduced, so that it should be avoided.

When a single-sided cardboard is used for the cylindrical inner cylinder B1, the inner cylinder B1 is arranged so that the flute direction is the top and bottom direction, as shown by a partial cutout in FIG. Therefore, the inner cylinder B1 is easily formed into a tubular shape, and can be easily mounted on the box A1. Further, the inner cylinder B1 easily becomes cylindrical in accordance with the inner pressure of the inner bag P1, so that the inner pressure can be efficiently absorbed. Further, the single-sided cardboard can easily maintain the tubular shape by the flute effect, and has a high tensile strength, so that the inner cylinder B1 is not torn by the internal pressure of the inner bag P1. Further, since the inner cylinder B1 made of a single-sided corrugated cardboard has a small expansion, the expansion does not affect the blister.
Further, since the flute of the single-faced cardboard reliably functions as a spacer between the outer box A1 and the inner bag R1, the danger of bulging of the outer box A1 is further reduced.

As shown in FIGS. 6 and 7, a liquid packaging container R2 according to another embodiment of the present invention has a body portion of A21, A2.
A square inner cylinder B2 formed by applying a ruled line to a double-faced corrugated cardboard sheet and forming a polygonal cylindrical shape is mounted on a rectangular outer box A2 composed of 2, A23 and A24. The total length of the outer side of the side wall of the cornered inner cylinder B2 corresponding to the inner size of the side wall of each side of the outer box A2 is a length larger than 95% of the inner side wall size of the outer box A2. Further, the dimension in the height direction of the square inner cylinder B2 is substantially the same as the position where the inner flap a is horizontally held when the flaps a21 to a24 of the outer box A2 are closed as lids. The liquid packaging container R2 is composed of an outer box A2 and a square inner cylinder B2.
It becomes the box of the double structure which consists of. Therefore, the box strength of the liquid packaging container R2 is greatly improved, and particularly the pressure resistance is improved, so that the material of the outer box A2 and the square inner cylinder B2 can be reduced.

The side wall of the square inner cylinder B2 has a large number of side walls (8, 12 or 1) as shown by a partial cutout in FIG.
6), the width of each side wall is short, and the flute direction of the double-sided corrugated cardboard sheet is arranged perpendicular to the vertical direction, so that the bending strength of the side wall of the square inner cylinder B2 is greatly increased. As shown in FIG. 9, the square inner cylinder B2 is made of one double-faced corrugated cardboard sheet and has a high tensile strength and a small expansion, so that there is no tearing or elongation due to the internal pressure, and the square inner cylinder B2 bulges. Very little. Further, even if the squared inner cylinder B2 swells, the outer box A2 and the squared inner cylinder B2
Since the gap S2 between the two absorbs the blister of the square inner cylinder B2, the outer box A2 does not bulge.

[0039]

As described above, in the liquid packaging container of the present invention, even when the inner bag filled with liquid or the like is stored, the blister caused by the internal pressure is kept at the side wall of the cylindrical inner cylinder or the square inner cylinder. In addition, since it is absorbed by the gap between the outer case and the inner cylinder, the swelling of the outer case can be prevented. That is, since the length of the outer periphery forming the inner cylinder is substantially the same as the length of the circumference inscribed in the inner dimension forming the outer box, and because a gap is provided between the outer box and the inner cylinder. Since the internal pressure is largely absorbed by the gap between the inner cylinder and the inner cylinder, the inner pressure of the inner bag does not have such an effect as to cause the outer box to bulge.

Further, by using the single-sided cardboard for the side wall, the flute of the single-sided cardboard becomes a spacer between the inner bag and the outer box and does not come into direct contact with the outer box. Further, the flute of the single-sided cardboard serves as a buffer against internal pressure.
The outer box can be protected from the shock of vibration and drop.

The bending strength of the square inner cylinder is improved by using a double-sided corrugated cardboard for the square inner cylinder, providing a large number of ruled lines on the side wall of the square inner cylinder and bending to provide a large number of short side walls. In addition, the internal pressure can be absorbed by the square inner cylinder, and the outer box can be prevented from bulging.

Further, by using the flute direction of the square inner cylinder perpendicular to the top and bottom, the bending strength of the square inner cylinder is further improved, so that the square inner cylinder can be easily blistered or seated. The outer box does not bulge because it does not bend and the amount of distortion is reduced.

The outer case is a general-purpose A-type cardboard box or C type.
A wrap round type box can be used, and the square inner cylinder is a simplified version of the A type cardboard box, so it can be manufactured by applying existing equipment. Furthermore, since the inner cylinder with a square structure is simple, it is 1 m from a small container of about 10 liters.
It can easily handle large containers such as 3.

Further, since the outer box and the inner cylinder can be easily folded, they can be easily folded for transportation and storage until use, or when discarded after use. Can be reduced. The material of the outer box and inner cylinder used for the liquid packaging container is selected from various materials and various types of flutes, such as single-sided cardboard, double-sided cardboard, double-sided cardboard, high-strength cardboard, etc. Since the sheets can be selected separately, the container has a high degree of freedom.

Furthermore, since the total length of the outer dimensions of the inner cylinder and the like is made smaller than the total length of the inner dimensions of the outer box, the inner cylinder and the like can be easily inserted into the outer box. Since it is possible, automation of a machine for inserting the inner cylinder and the like is also easy.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention during assembly.

FIG. 2 is a perspective view of the first embodiment of the present invention during assembly.

FIG. 3 is a development view of the outer box A1 according to the first embodiment of the present invention.

FIG. 4 is a development view of a cylindrical inner cylinder B1 according to the first embodiment of the present invention.

FIG. 5 is a sectional view taken along line YY in FIG. 1 of the first embodiment of the present invention.

FIG. 6 is a perspective view of a second embodiment of the present invention during assembly.

FIG. 7 is a perspective view of a second embodiment of the present invention during assembly.

FIG. 8 is a development view of an outer box A2 according to the second embodiment of the present invention.

FIG. 9 is a development view of a square inner cylinder B2 according to a second embodiment of the present invention.

FIG. 10 is a sectional view taken along line YY in FIG. 6 of a second embodiment of the present invention.

[Explanation of symbols]

 A1, A2 ... outer box B1, B2 ... inner cylinder R1, R2 ... embodiment of the present invention S1, S2 ... gap between outer box side wall and inner box side wall P1, P2 ... inner bag

Claims (7)

[Claims] 1. A liquid container for storing an inner bag filled with liquid or the like, a substantially square outer box having a body having a bottom and a lid and having four side walls, and an inside of the outer box. A liquid packaging container formed of a cylindrical inner cylinder made of paper to be attached to, wherein the apparent outer peripheral length of the inner cylinder is substantially equal to the length of a circle inscribed in the inner dimension of the outer box. A liquid packaging container having the same length, wherein the height direction of the inner cylinder does not exceed the inner dimension height of the outer box and exceeds 60%. 2. The liquid packaging according to claim 1, wherein the inner cylinder is a single-sided cardboard made of any one of A, B, C, and E, and the flute direction of the single-sided cardboard is the top and bottom direction. container. 3. The liquid packaging container according to claim 1, wherein an apparent outer peripheral length of the inner cylinder is smaller than 110% of a length of a circle inscribed in an inner dimension of the outer box. 4. A liquid container for storing an inner bag filled with liquid or the like, a substantially square outer box having a bottom part and a lid part and a body part having four side walls, and an inner part of the outer box. A liquid packaging container formed of a cylindrical inner cylinder (hereinafter referred to as a square inner cylinder) made of an 8- to 16-hexagonal polygon made of a corrugated cardboard sheet to be mounted on a cardboard sheet, wherein the flute of the corrugated cardboard sheet is The outer peripheral length of the apparent inner circumference of the square inner cylinder is substantially the same as the length of a circle inscribed in the inner size of the outer box. A liquid packaging container whose height direction does not exceed the inner height of the outer box. 5. The liquid packaging container according to claim 4, wherein the square inner cylinder is made of a double-sided cardboard, a double-sided cardboard, or a double-sided cardboard. 6. The outer case according to claim 4, wherein the sum of the outer circumferences of the sides of the square inner cylinder corresponding to each side of the side wall of the outer box is smaller than 95% of the inner length of each side of the side wall of the outer box. 6. The liquid packaging container according to 5. 7. An aspect ratio of an inner dimension of the outer box is 1.2.
The liquid packaging container according to any one of claims 1 to 6, which does not exceed the following.