JPH0999976A - Bag in box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of pin holes in a corner of an inner bag during the storage and carriage by keeping a prescribed relationship between the length and width of the bottom surface, and the height of an outer box, keeping the inner bag in a flat shape, and sealing its periphery in a flat manner. SOLUTION: An inner bag B is of a flat shape in which face and back sheets 1, 2 are attached to each other by sealing the periphery (a sealed part 3) in a flat manner, and the face sheet 1 is provided with a mouth plug 4 for taking out the content. An outer box A is provided with a top face 12 to the upper part parallel to a bottom face 10, and side walls 13-16 in the vertical direction. The relationship of W/H=4-5, or L/H=4-5 are established, where H, L and W are the length, width and height of the outer box A. Thus, the outer box A is also flat, capable of storing the whole inner bag B without forming any excessive space, and of the shape suitable for protection of the inner bag B. No concentrated load is applied to the inner bag by the vibration during the carriage, and generation of pin holes can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag-in-box, and more particularly to a bag-in-box which prevents pinholes from being formed in the corners of an inner bag when the contents are stored or when the contents are stored and transported. .

[0002]

2. Description of the Related Art As shown in FIGS. 4 (a), (b) and (c), as a conventional container for storing liquids, a rigid outer box has a linear low density polyethylene (LLDPE) and a stretched nylon. A bag-in-box that is made of a soft packaging material such as (O-NY) and that stores an inner bag with a volume of 5 to 20 liters that is gusset-folded is used. Usually, the shape of the outer box of the bag-in-box is such that the relationship between the heights H and H of the bottom and the lengths L and W of the bottom is W / H = 0.8 to 1.2 L / W = 0. Those of 8 to 1.2 are often used. That is, the shape is close to a cube. The inner bag to be inserted therein had a shape similar to a cube when the contents were stored.

[0003]

However, in the case of the contents to be stored, particularly dairy products such as milk and cream, the resin used as the inner bag is limited by the law such as the Ordinance of the Ministry of Milk, etc. Resin with pinhole property may not be used. In such a case, a resin that is originally unsuitable for the inner bag of the bag-in-box, such as a hard resin, may be used. With this resin,
When the inner bag is formed by gusset folding and stored in an outer box with a shape close to a cube, the inner bag also becomes a cube when the contents are stored, and triangular pyramid-shaped corners 5 are formed on the inner bag, which causes shaking during transportation, The vibration caused corner 5 to hit the outer box, resulting in a pinhole. Therefore, it is an object of the present invention to disclose a bag-in-box in which pinholes are unlikely to occur regardless of what resin is used for the inner bag.

[0004]

In order to achieve the above object in the present invention, a first aspect of the present invention is a bag-in-box in which an inner bag made of a soft packaging material is housed in a rigid outer box. In the outer box, the heights H and the lengths L and W of the bottom of the outer box respectively have a relationship of W / H = 4 to 5 or L / H = 4 to 5, and the inner bag is The bag-in-box is characterized in that the shape is flat and the periphery is flatly sealed.

Further, the present invention is the bag-in-box of the first invention, wherein the surface of the inner bag is provided with a spout for extracting contents.

[0006]

According to the bag-in-box of the present invention, the outer box A
And the inner bag B has the above-mentioned configuration. Therefore, the inner bag B has a flat shape because its periphery is flatly sealed, and the inner bag B has a vertical length L and a horizontal length L of the bottom surface, respectively.
No corner is formed on the inner bag even if the inner bag is accommodated in the outer box A in which the relationship between W and the height H is W / H = 4 to 5 or L / H = 4 to 5. Therefore, the shape becomes flat, and vibration during transportation,
A concentrated load is not applied to the inner bag due to shaking and pinholes do not occur.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to Examples. FIG. 1 shows a bag-in-box of the present invention. B is an inner bag, and the inner bag B has a flat shape in which the front and back two sheets 1 and 2 are laminated by sealing the periphery (sealing portion 3) flatly. Is provided with a spout 4 for taking out contents.

Here, as the resin forming the inner bag, a resin having a high pinhole resistance such as linear low density polyethylene (LLDPE) and drawn nylon (O-NY) can be used, and of course, low density polyethylene. Resins with low pinhole resistance such as (LDPE) and high density polyethylene (HDPE) can also be used. Other than this, the resin conventionally used as the inner bag of the bag-in-box can also be used.

FIG. 2 is a perspective view of the outer box of the bag-in-box of the present invention. A is the outer box, 10 is the bottom,
Reference numeral 12 is a top surface provided on the top of the bottom surface 10 in parallel with the bottom surface 10, and reference numerals 13 to 16 are side surfaces provided perpendicularly to the bottom surface 10 and the top surface 12. The vertical, horizontal, and height dimensions are H, L, and
If W is set, the following formula is established between the respective dimensions. W / H = 4 to 5 (1) L / H = 4 to 5 (2) Since there is a relation that the above equation holds between the respective dimensions of the outer box A,
The outer box A also becomes flat, and the entire inner bag B can be stored without forming an extra space, and has a shape suitable for protecting the inner bag B.

As the material of the outer box A, a highly rigid material such as corrugated board or paper board can be used.

FIG. 3 is a sectional view showing a state in which the inner bag B is housed in the outer box A in the bag-in-box of the present invention. In the bag-in-box of the present invention in which the inner bag B is housed in the outer box A satisfying the above formulas (1) and (2), the entire inner bag B is housed in the outer box A without forming triangular pyramid-shaped corners. ing. Therefore, even if there is vibration or the like during transportation, a concentrated load is not applied to the inner bag B. Therefore, even if a resin having no pinhole resistance is used for the inner bag B, the occurrence of pinholes can be prevented. Further, according to the bag-in-box of the present invention, it is possible to cope with a volume of 5 to 20 l, for example.

[0012]

【Example】

<Example> Dimensions are 500 mm in length, 440 mm in width, and height 1
In an outer box made of corrugated cardboard with a diameter of 05 mm, 5 ° C. water 20
The inside dimension of the seal is 590 mm ×
Insert the inner bag B of 526 mm, made of 3 layers of LDPE / HDPE / LDPE, each layer having a thickness of 40 μ, and apply acceleration of 1 G, vertical direction, amplitude 2.2 mm, vibration of frequency 15 Hz to 60 It was given for a minute, and the number of through pinholes was measured. As a result, the number of through pinholes is 0 to 1
The number was 1 / bag, which was at a practical level.

<Comparative Example> The dimensions are 257 mm in length and 257 in width.
mm, height 325 mm, in an outer box made of corrugated paper,
Sealed with 20 liters of water at 5 ° C, the inner dimensions of the seal are 590 mm × 526 mm, and the material is LDPE / HDPE.
The inner bag B having a three-layer structure of / LDPE and each layer having a thickness of 40 μ is inserted, and the acceleration is 1 G, the vertical direction, and the amplitude is 2.
The number of penetrating pinholes was measured by applying a vibration of 2 mm and a frequency of 15 Hz for 60 minutes. As a result, the number of through pin holes was 4 to 7 per bag, which was not suitable for practical use.

[0014]

As described above, the present invention has the following effects. That is, in the outer box, since the relationship between the heights H and H of the bottom and the lengths L and W of the bottom, respectively, is W / H = 4 to 5 or L / H = 4 to 5, When stored, it does not create a wasteful space in the outer box, and is therefore the optimum shape for protecting the inner bag.In addition, the inner bag has a flatly sealed shape with no corners formed, so it can be concentrated. Since no load is applied to the pin, even if a resin with weak pinhole resistance is used, pinholes do not occur due to shaking or vibration during transportation.

[Brief description of drawings]

FIG. 1A is a perspective view of an outer bag when the inner bag is stored in the outer box, and FIG. 1B is a perspective view of the inner bag when the inner bag is stored in the outer box. It is a figure.

FIG. 2 is a perspective view showing the outer appearance of the outer box of the bag-in-box of the present invention.

FIG. 3 is a cross-sectional view showing a state in which the inner bag of the bag-in-box of the present invention is stored in the outer box.

4A is a perspective view of an outer box, FIG. 4B is a perspective view of an inner bag, and FIG. 4C is a perspective view showing a stored state of the inner bag and the outer box.

[Explanation of symbols]

 A: Outer box of bag-in-box of the present invention B: Inner bag of bag-in-box of the present invention C: Outer box of conventional bag-in-box D: Inner bag of conventional bag-in-box 1 Sheet 2 Back sheet 3 Seal part 4 Stopper 5 Corner 10 Bottom 12 Top 13 to 16 Side

Claims (2)

[Claims] 1. A bag-in-box in which an inner bag B made of a soft wrapping material is housed in an outer box A having rigidity, and the outer box A has bottom and lengths L and W, respectively, of its bottom surface. The relationship with H is W / H = 4 to 5 or L / H = 4 to 5, and the inner bag B is flat in shape and has a configuration in which the circumference is flatly sealed. Inbox. 2. The bag-in-box according to claim 1, wherein the inner bag B is provided with a spout for extracting contents.