JPS6341351Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a so-called back-in box, which is a paper container with a built-in bag body and which stores liquid.

BACKGROUND ART Conventionally, paper containers with built-in bags, known as back-in-boxes, have been used in a wide variety of ways as liquid storage containers. At least the spout part of the inner bag stored inside the outer case is fixed to the case, and the outer case and inner bag are partially glued together during the manufacturing process. In the vicinity of the spout, the inner bag is fixed to the outer case, and the other parts of the inner bag expand as liquid is injected and expand along the wall of the case and fall into the case. It will become like this. Unlike the outer box, which is made of a relatively strong material, the inner bag stored inside the outer case is made of laminated films such as polyethylene and aluminum foil, and is stored on the inner wall of the outer case by injecting liquid. Therefore, the inner bag and the outer case are only joined at the portion where the spout projects outward from the inner bag and the side wall portion near the portion.

Problem to be solved by the invention Therefore, in the conventional technology, when liquid is stored in the inner bag, the outer case is closed, and the product is transported, the inner bag jumps inside the outer case, causing relative movement. However, as the inner bag is compressed and stretched, it becomes wrinkled and pinholes form in the inner bag, which is made of a material like aluminum foil, allowing bacteria to enter the liquid stored inside the container. Otherwise, the contents may deteriorate due to exposure to air.

The pinholes mentioned above are most likely to be found near the spout or in the part farthest from the fixing point between the outer case and the inner bag, i.e., in the upper and lower parts of the sides that have a large amount of relative movement, opposite to the part where the spout is installed. It has been experimentally confirmed that there are many risks that occur, but due to the manufacturing process, it is difficult to easily eliminate the relative movement between the inner bag of a back-in-box container and the side wall of the outer box. The inner bag must be stored in a stable state inside the outer case.

Means for Solving the Problems Therefore, the paper container with a built-in bag body according to this invention has an inner wall folding piece that continues to the upper part of the rear wall surface on the opposite side of the spout wall surface of the outer case in which the bag body is housed, and an inner wall folding piece that continues from this. It is equipped with a bag pushing piece and an upper wall surface that continues to the upper part of the spout wall surface, and a punched hole is provided at the bending line part of the boundary between the inner wall folding piece and the inner bag pushing piece. A vertical bending line is provided from the punched hole toward the wide tip of the bag pushing piece.

Then, the inner wall folding piece is folded into the outer case at the folding line at the boundary with the rear wall surface, the inner bag pushing piece is folded back inside the outer case at the folding line at the boundary with the inner wall folding piece, Moreover, it is bent and curved along the vertical bending line, and the upper wall surface continuing from above to the upper part of the spout wall surface is covered.

Function: The inner bag pushing piece slopes and presses the top surface of the inner bag filled with liquid, and the inner bag pushing piece is fixed inside the outer case by pushing its tip from above. Ru. In this way, the movement of the inner bag filled with liquid within the outer case is regulated by the inner bag pushing piece, so the occurrence of pinholes as mentioned in the problem to be solved by the above-mentioned invention is prevented. .

Example An embodiment of this invention will be described with reference to the drawings.

Figure 1 is an exploded view of the container outer box based on this invention.
Front wall 1 in the center, folded joints 2, 2 on both edges
There are a spout wall surface 4 having a spout hole 3 in the center, and a top wall surface 5, a folding joint 6 at the bottom of the front wall, a folding joint 7 at the tip of the top wall surface 5, and a front wall surface. Following 1, both side wall surfaces 8, 9, a rear wall surface 10, and a folding joint 11 are provided as shown in the figure, and furthermore, on the bottom side of both side wall surfaces 8, 9, there is a bottom wall surface 12, which overlaps to form the bottom of the box. 13. Fold-in joint 14, 1 on the upper side
5 are provided in succession, a folding joint 16 is provided on the lower side of the rear wall surface 10, an inner wall folding piece 17 is placed on the upper side, and an inner bag is connected to the inner bag through the folding line 18 and the punching hole 19 following the inner wall folding piece 17. A pushing piece 20 is provided. The tip portion 21 of the inner bag pushing piece 20 is slightly wider than the widths of the rear wall surface 10 and the front wall surface 1, and a bending line 22 is formed in the center thereof so as to reach the punched hole 19. It is provided from the edge of the tip portion 21. This is because when the inner bag pushing piece 20 is pushed into the upper opening, as shown in FIGS. As a result, it is slightly bent along the bending line 22 and is pushed between both side walls, and remains in that position in an almost stable state, with the upper left part of the liquid storage inner bag serving as the spout part. It is designed to maintain a symmetrical shape.

Next, the manufacturing process of the paper container A with a built-in bag according to this invention will be explained.

Figures 2 a to d show the manufacturing process, and Figure e is a cross-sectional view of Figure d. The paper container A with a built-in bag according to this invention has the inner surface of the blank of the box B shown in Figure 1. Then, insert the spout plug 23 of the inner bag C into the spout wall surface 4.
A part of the inner bag C is glued to the inner surface of the blank around its periphery and front wall surface 1, and then bent appropriately along the double fold line shown by the two-dot chain line and glued. It is manufactured by forming it as shown in Figure a.

In Figure a, a part of the inner bag C is glued to the spout wall 4 and the inner surface of the front wall 1 of the outer case B, and also to the bottom walls 12, 13, folded joints 6, 11, 16.
are also joined appropriately. From this state, the spout wall surface 4 is bent inward to join the folded joints 2, 2 to both side wall surfaces 8, 9, and the inner wall folding piece 17 rising from the rear wall surface 10 is folded along the double fold line (double-dashed line). ) 24 and fold back the inner bag pushing piece 20 along the bending line 18. Inner bag push piece 2
Since the width of the tip 21 is larger than the distance between the side walls 8 and 9, the tip 21 does not sink into the case, and the inner bag pusher piece 20 faces diagonally upward when it is inserted into the side walls 8, 9. 9 is fixed to the upper edge. This inner bag pushing piece 20 is provided with a punched hole 19 along the bending line 18 so as to connect with the central bending line 22, so that the inner bag pushing piece 20 can be easily bent along the bending line 18. , and the bending line 22 imparts appropriate bending elasticity to the inner bag pushing piece 20. Next, as shown in figure c, fold joint 1
4 and 15 are folded in, the tip of the inner bag pushing piece is pressed down, and the inner bag pushing piece is fixed. Then, the top wall surface 5 is covered with a lid and glued to form a paper container A with a built-in bag body as shown in Fig. d.

Note that, depending on the case, the punched hole 19 and the bending line 22 may be omitted, and furthermore, the width of the tip end 21 of the inner bag pushing piece 20 does not need to be larger than the distance between the side wall surfaces 8 and 9.

Effects of the invention Figure e is a cross-sectional view of the paper container A with a built-in bag shown in Figure d, and is shown with liquid stored in the inner bag C. The inner bag pushing piece 20 is joined to the outer case B and is configured to hold down the inner bag C diagonally downward, so that even if the stored liquid moves, the inner bag C hardly moves.
This prevents the inner bag from becoming wrinkled and prevents the occurrence of pinholes in the inner bag.

According to this invention, an inner wall folding piece 1 is attached to the outer box B.
7. Punching hole 19, bending line 22, wide tip 2
By adding the simple structure of providing the inner bag pushing piece 20 having the inner bag pusher 1, the above effects can be achieved.

[Brief explanation of the drawing]

Figure 1 is a developed view of the outer box according to this invention, Figures 2 a to e are explanatory diagrams showing the manufacturing process of the paper container with a built-in bag according to this invention, d is a completed view, and e is a sectional view thereof. It is. A...Paper container with built-in bag, B...Outer box, C...Inner bag, 1...Front wall, 3... Outlet spout, 4... Outlet wall, 10...Rear wall, 17... ...Inner wall folding piece,
18...Bending line, 19...Punching hole, 20...
Inner bag pushing piece, 21...Tip, 22...Bending line.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The inner wall folding piece that continues to the upper part of the rear wall surface on the opposite side from the spout wall surface of the outer case in which the bag is stored, the inner bag pushing piece that continues therefrom, and the spout wall surface The inner wall folding piece is folded into the outer case at the bending line at the boundary with the rear wall surface, and the inner bag pushing piece is folded inside the outer case at the bending line at the boundary with the inner wall folding piece. A paper container with a built-in bag, characterized in that the paper container has a built-in bag and is turned over, and the upper wall surface continuing from above to the upper part of the spout wall surface is covered. (2) A punched hole is provided at the bending line at the boundary between the inner wall folding piece and the inner bag pushing piece, and the inner bag pushing piece is bent from the punched hole toward the wide tip of the outward expanding inner bag pushing piece. A paper container with a built-in bag according to claim 1 of the utility model registration claim, which is provided with a line.