JPH09202357A - Bag-in-box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow contents to be discharged with little wrinkles on a film in a bag-in-box with a reinforcing material provided on an inner face of a carton by fixing an upper rim on a face having an ejection port of a plastic inner bag and upper and lower rims oh a face opposite to one having the ejection port to an inner face of the reinforcing material. SOLUTION: An inner bag 5 is pasted via an adhesive part 6 to an inner frame 4 as a reinforcing material along an inner face of a carton, while the inner bag 5 and the inner frame 4 are pasted to each other at upper and lower rims of the inner frame 4 on an opposite side to a face with an ejection port 2. By assembling the inner frame 4 to form a cube and putting this into the carton 1, a bag-in-box having the ejection port 2 on a top face of the carton 1 can be obtained. When contents are discharged by this box with the ejection port 2 facing downward, since the inner bag 5 is pasted to the reinforcing material 4 on a rear of the ejection port 2 and in the vicinity of the ejection port 2, the inner bag 5 can maintain its state, thereby preventing the inner bag 5 from closing the ejection port 2 for stabilizing a discharge rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back-in box composed of a substantially rectangular or cubical carton and an inner bag accommodated in the carton, and particularly, to easily discharge contents such as liquid, viscous substance or powder. Regarding the back-in-box made possible.

[0002]

2. Description of the Related Art A back-in box (Bag-in-box) in which an inner bag made of a plastic film is housed in a substantially rectangular or cubic carton made of cubic cardboard.
Box) has been widely known as a packaging container for liquid, viscous body or powder. However, in the conventional back-in-box, since the inner bag made of plastic film is not fixed to the carton, as the contents are discharged, the plastic film of the inner bag is broken and the spout is blocked, making it difficult to take out the contents. There is a problem that the contents remain on the wrinkles of the inner bag. In order to solve this point, for example, a back-in-box in which an inner bag is attached and fixed to the inner surface of an outer box is known (for example, JP-A-7-187).
235). However, such back-in-box is usually for small capacity, and the pressure resistance of the exterior is low,
For example, when a liquid of more than 5 liters is stored, there are problems such as blistering and crushing of the exterior during stack storage. In addition, there are some that use a corrugated cardboard carton to have pressure resistance, but since this type of carton is used to paste the sheet with a machine, if the inner bag is fixed to the carton, it will not hang on the machine and will not stick to the machine. However, the inner bag is fixed manually, and the workability is extremely poor.

[0003]

As a result of various studies to solve the above-mentioned drawbacks, the present inventor provided a reinforcing material along the inner surface of the carton, and fixed the inner bag to the reinforcing material so as to spout the spout. It has been found that the pressure resistance of the exterior can be increased by providing a reinforcing material, and that the present invention has been completed, and the object of the present invention is to easily discharge the contents, In addition, a back-in box having high pressure resistance that can be easily performed is provided.

[0004]

The object of the present invention is to provide a back-in-box comprising a carton of a substantially rectangular parallelepiped or a cube, a reinforcing member having a rectangular cross section along the inner surface of the carton, and a plastic inner bag having a spout. In the plastic inner bag, the upper edge portion of the surface having the spout and the upper edge and the lower edge portion of the surface opposite to the surface having the spout are fixed to the inner surface of the reinforcing member. It is a back-in-box.

The present invention will be described in more detail. The back-in-box in the present invention is not different from the conventionally used carton and inner bag in size, material, etc., but in the present invention, a reinforcing material is provided along the inner peripheral surface of the carton, and Glue and fix the inner bag. Further, the reinforcing material and the inner bag are adhered so that the contents in the inner bag can be discharged from the discharge port without delay, and specifically, at least the upper edge portion of the surface having the spout The upper edge and the lower edge of the surface opposite to the surface having the spout may be fixed to the inner surface of the reinforcing material. The adhesive between the reinforcing material and the inner bag of the plastic film is not particularly limited, and for example, a vinyl acetate emulsion adhesive is preferable.

The bag-in-box of the present invention will be specifically described with reference to the drawings. 1 is a partial cross-sectional perspective view of a bag-in-box according to the present invention, FIG. 2 is a plan view of a folded inner frame with an inner bag, and FIG. 3 is an explanation of a state in which contents are being discharged. It is a figure. Inner frame 4 as shown in FIG.
An inner bag 5 is adhered to the inner frame 5 by an adhesive portion 6 on the upper edge of the inner frame 4. The inner bag and the inner frame are bonded to each other at the upper edge and the lower edge of the inner frame on the side opposite to the side having the spout. This inner frame 4
Open and fold it along the key line 7 to assemble it into a quadrilateral section,
The portion of the inner bag 5 protruding from the inner frame forms a retracted cube. When this is loaded inside the outer carton 1,
A bag-in-box having a spout 2 on the top surface of the outer box 1 as shown in FIG. 1 is obtained. In the assembled bag-in-box carton, the reinforcing material 4 is present along the inner surface of the carton 1, and the plastic film bag 5 is adhered and fixed to the reinforcing material 4 by the adhesive portion 6. The bonding portion 6 has an upper edge portion and a lower edge portion on the back surface of the spout, and only the upper edge portion is adhered on the side where the spout is located. It should be noted that by providing the grasping hole 3 on the bottom of the carton on the side opposite to the side where the spout is provided, the container can be easily tilted and the contents can be easily dispensed. Also, the inner bag is of a gusset type or is provided with a corner seal at the bottom so that the inner bag can be easily formed into a square shape when the inner frame is opened. A cross-sectional view of the pouring out state is shown in FIG. FIG.
At, when the contents are discharged with the spout 2 facing downward,
Since the back surface of the spout and the vicinity of the spout are adhered to the reinforcing member 4 in the plastic inner bag 5, the same state can be maintained even when the content is poured out. As the volume decreases, the plastic film bag blocks the outlet and the wrinkles that occur make it difficult for the contents to come out.The outflow amount is stable, and the conventional inner bag is fixed as residual liquid. Much less than without it.

[0007]

EXAMPLES AND COMPARATIVE EXAMPLES Hereinafter, the present invention will be specifically described with reference to Examples. Example 1 In a bag-in-box having an internal volume of about 20 liters, the amount of the residual liquid was tested with water as the content. The average was 60 cc to 40 cc or less, and almost no water remained in the inner bag. For example, the content was a film. In the case of high-viscosity substances that tend to adhere to, the difference will be more significant. Further, since the holding hole for hooking a finger is formed on the bottom surface of the case, the outer box can be tilted in a state that it is easy to hold and the pouring work can be easily performed.

[0008]

The effects of the present invention are as follows. (1) Since the plastic film bag is partially fixed to the reinforcing material, the shape of the plastic film bag can be changed according to the decrease in the contents, and the film can be discharged with few wrinkles that hinder the discharge of the contents. It is also possible to prevent it from being discharged vigorously. (2) Since the plastic film bag is partially fixed to the reinforcing material, the plastic film bag can be easily separated from the reinforcing material even at the time of disposal, and it is easy to separate and discard. (3) It is possible to change the area, shape, and number of the holes on the bottom surface of the case according to the strength of the case to be used, strong usability, and the like. (4) Since the plastic film bag and the inner frame are configured as described above, the plastic film bag and the inner frame can be set with one touch.

[Brief description of drawings]

FIG. 1 is a perspective view of a back-in-box according to the present invention.

FIG. 2 is a plan view of the inner frame with the inner bag folded.

FIG. 3 is an explanatory cross-sectional view of a state where the contents are poured out from the back-in box according to the present invention.

[Explanation of symbols]

1 carton 2 spout of inner bag 3 hole for gripping 4
Reinforcement material (inner frame) 5 Plastic film bag (inner bag) 6 Adhesive part 7
K line

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masaaki Murashi 1-4-1 Nihonbashi Bakurocho, Chuo-ku, Tokyo Fujimori Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A back-in box comprising a substantially rectangular parallelepiped or cubic carton, a reinforcing member having a rectangular cross section along the inner surface of the carton, and a plastic inner bag having a spout, wherein the spout of the plastic inner bag is A back-in-box, wherein an upper edge portion of a certain surface and an upper edge portion and a lower edge portion of a surface opposite to a surface having a spout are fixed to an inner surface of the reinforcing material.