JPS6128756Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a container made of cardboard.

Corrugated cardboard is extremely lightweight, has insulation and cushioning properties, and has appropriate strength (bursting strength, tensile strength, compressive strength, etc.), and is inexpensive, so it is widely used in various products. Used as packaging material. However, since the main material is paper, it has the disadvantage of being inferior in moisture and waterproof properties, and because the cardboard structure is hollow inside and the cut end opens into the cavity, it is difficult to create a seal with excellent airtightness and watertightness. As a result, they are not suitable for containers that store liquids or hygroscopic powders. On the other hand, containers for storing milk and juice have been developed using waterproof paper with a heat-sealable film attached to the inner surface, but the hollow cardboard structure does not allow heat to be conducted to the heat-sealable film. Due to the slow speed, there was a problem in that it was difficult to adhere the seal pieces.

Therefore, the purpose of this invention is to assemble a container suitable for storing a large amount of liquid or powder using cardboard waterproofed with a heat-sealed film, and to improve the efficiency of the assembly process.

Next, this example of the invention will be explained based on the drawings.

FIG. 1 shows a case where a liquid storage container about the size of a can is assembled using cardboard F, and this will be explained in detail with reference to the following drawings.

As shown in Fig. 2, corrugated board F is made by laminating front and back liners 2 and 3, also made of kraft paper, to a core 1 made of corrugated kraft paper.
A plastic heat-sealed film laminated on the outside is used.

To assemble the container, as shown in Figure 5, make a predetermined crease in a piece of rectangular cardboard F.
The wave traveling direction P of the center core 1 is horizontal and the film 4
Used with the side facing inside the container. Further, each end has seal pieces 5, 6, 7, and 8, and one piece 5 of the both side end seal pieces 5, 6 is formed longer than the other piece 6.

Further, each sealing piece 5, 6, 7, 8 has the front and back liners 2a, 3a adhered to each other by omitting the core 1, so that each end of the corrugated board F is sealed.

Then, the films 4a and 4b of both pieces 5 and 6 are placed so that the seal pieces 56 on both sides face outward.
At the same time, as shown in FIG. 3, the longer piece 5 is heat welded to the side wall 9, and its seal portion 10 is fixed in a face down position. At this stage, it becomes a rectangular cylinder as shown in FIG.

Next, as for the upper seal piece 7 and the lower seal piece 8, the left and right pieces 7a, 7b and 8a, 8b, which are separated at the center of the width, are turned outward in the same manner as described above, and the film 4c, Heat weld 4d together to seal the top and bottom ends.

In this state, the container is completely sealed, but since bag-like pieces 11 are formed on both sides of the top and bottom, the pieces 11 are temporarily fixed to the side wall 9 with simple adhesive as shown in FIG. Alternatively, it may be temporarily attached to the upper or lower wall. In any temporary fixing, the seal portion 12 is necessarily turned upside down.

Note that the actual assembly procedure does not necessarily follow the above-described order; for example, the upper sealing piece 7 is attached after the lower sealing piece 8 is attached because of the need to insert the contents.

In this case, the box is generally provided to the consumer in an assembled state with the top open, and the consumer seals the top after storing the product.

However, in this case, the user needs to be equipped with a heat welding device, so the upper sealing piece 7 may not be provided and the upper opening may be sealed with adhesive tape such as kraft paper. good.

Furthermore, when heat welding cardboard with a film, the heat transfer to the film is slow due to the fact that the cardboard has cavities, but the sealing pieces 5, 6,
Since the core 1 is omitted from the cores 7 and 8, heat can be transferred very quickly and thermal welding can be carried out efficiently. Moreover, since the seal pieces 5, 6, 7, and 8 can be easily bent, assembly is also facilitated.
In this case, the front and back liners 2a and 3 of the seal piece
It is desirable to glue the cardboard F to the corrugated cardboard F and seal the edges.

However, as shown in FIG.
4, and when the sealing piece 15 also has film extension pieces 13a and 14a, there is no need to seal the ends of the sealing piece at the stage of corrugating, and when the sealing pieces are bonded together, By heating the front and back liners 2a and 3a can be bonded together at the same time.

As explained above, in the cardboard container of this invention, the core is removed between the front and back liners of the seal pieces, and the front and back liners are glued together in the missing part, so the seal pieces are attached to each other with a film. When thermally welding, heat is easily transmitted to the film and instant bonding can be achieved, so this invention has the effect of increasing work efficiency in assembling cardboard containers by welding the film.

In addition, the ends of the seal pieces are sealed by adhesion of the front and back liners, and the seal portion has a structure in which the seal pieces are adhered to each other by welding a film on the outside of the container. Since it exits the container without touching the liquid inside, the liquid inside can never seep through the edge of the cardboard into the cavity between its front and back liners, thus preventing damage to the cardboard due to liquid contents. can be transported and stored safely.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway perspective view of the cardboard container of this invention, Figure 2 is an enlarged sectional view of the cardboard used to implement this invention, and Figure 3 is Figure 1A-
FIG. 4 is an enlarged cross-sectional view taken along the line A--B. FIG. 5 is a developed view of the cardboard container according to this invention. FIGS. 6 and 7 are the same cardboard containers. FIG. 3 is a perspective view showing the assembly procedure. FIG. 8 is a partial sectional view of a corrugated board according to another embodiment of this invention. F...Cardboard, P...Wave traveling direction of the center core, 1
... Core, 2, 3 ... Liner, 4 ... Plastic heat-welded film, 5, 6, 7, 8 ... Seal piece, 10 ... Seal part, 12 ... Seal part, 1
3,14...Plastic heat welding film, 1
5... Seal piece, 2a, 3a... Seal piece part front and back liner.

Claims (1)

[Scope of utility model registration request] In a container made of corrugated cardboard, which is assembled with a plastic heat-sealed film bonded to at least one side of the corrugated cardboard, with the film side facing inside; each end of the corrugated cardboard has a core between the front and back liners that is missing; A seal piece for container assembly is provided with the front and back liners glued together at the removal part.
A container made of corrugated cardboard, characterized in that opposing seal pieces of the seal pieces are adhered to each other by welding their films on the outside of the container, and the adhesive seal portion is bent so as to face down on the wall of the container.