JPS5922015Y2 - Structure of the top or bottom of the paper container - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of the top or bottom of a rectangular cylindrical paper container made of paperboard having heat-adhesive plastic layers on both the front and back sides.

Rectangular cylindrical paper containers are popular as containers for milk, alcoholic beverages, etc., and their bottom structure is generally in the unfolded state shown in FIG.

That is, the 4 side plates 1, 2, 3.4 are connected to each other.
The two bottom plates consist of inner bottom plates 27, 29 and outer bottom plates 26, 28 whose edges are extended to be larger than the inner bottom plates. Folds 34.degree. 38 are provided in the form of isosceles triangles whose bases are the boundary lines with the side panels.

During assembly and molding, the outer bottom plates 26 and 28 are heated and bonded in an overlapping state.

The bottom formed in this way will not cause any problems as a milk container, but it may leak when containing highly permeable contents such as soybean oil or cooking oil, making it impossible to expect a complete seal. could not.

Liquid leakage is most likely to occur at the isosceles triangular fold 34.
．． This is the apex portion of the inner bottom plates 27 and 29 that are bent along the line 38.

The contents leaking from this part gradually permeate each adhesive surface of the bottom plate, and after a long period of time, leak out of the container.

In order to improve this point, the applicant first proposed the
In No. 67135, a container was proposed in which a tongue-like tip piece was connected to the inner bottom plate to improve sealing performance.

Various other improved structures have been proposed, but
In either case, the folding process is complicated, and the folded portion has strong resistance to restoring, so there is a risk that it will deform after heat bonding and cause liquid leakage.

The present invention reduces the resistance at the bending part by providing a tip piece with appropriate notches in parts that do not directly contribute to sealing performance.
The present invention provides a structure for the top or bottom of a paper container that further improves the sealing performance of the abutting portion of the apex of the inner bottom plate.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a developed view of the bottom of the paper container seen from the outside, FIG. 3 is a perspective view of the bottom of the paper container during assembly and molding, and FIG. 4 is a bottom view after assembly and molding.

In FIG. 1, solid lines within the outline indicate mountain folds, and dotted lines indicate valley folds.

The side plates 1, 2, 3.4 and the joint piece 5, which are connected through the folds, have a top plate (not shown) that forms a top part connected to the upper part, and a bottom plate that forms a bottom part to the bottom part. has been done.

The bottom plate consists of a pair of opposing outer bottom plates 6, 8 and a pair of opposing inner bottom plates 7, 9, and the inner bottom plates 7, 9 include:
Isosceles triangular folds 14 and 18 whose bases are the boundaries with the side panels, respectively, to enable folding into the inside of the container.
is provided.

Further, each of these bottom plates 6, 7, 8.9 has a tip piece 1.
0.11.12.13 are arranged in a row, and the tip piece 10 provided on the first outer bottom plate 6 located at the outermost side during assembly molding is connected to the other tip pieces 11. 1
2.13, it is formed to be greatly extended, and the second
A tip piece 12 provided through a fold 17 on the outer bottom plate 8 of the
are formed by notching both ends symmetrically around the center part, and the tip pieces 11 and 13 provided on the inner bottom plates 7 and 9, respectively, are formed by cutting out the ends adjacent to the outer bottom plate 8. It is formed.

These end pieces 11 and 13 each have an inner bottom plate 7 in the central part.
．． It has a fold line 15.19 that continues to the apex of the isosceles triangular fold line 14.18 provided at 9, and has a fold line 16.20 extending from this apex toward the outer sole plate 8.

The length of the notch of the tip piece 11.13 is 215 mm of the total length of each piece.
Requires the following:

In the tip piece 11.13, the portion indicated by length B is the tip piece 1.
Since it has the function of being bonded to the inner surface of 2 and improving the sealing performance, if the notch is too large, this function will be insufficient.

In addition, the length shown by B of the tip piece 11.13 is the length of the tip piece 12.
If the relationship is 1/2 with respect to the length A, it is convenient because the edges of the notches coincide during assembly and molding.

The unfolded paperboard that has been cut and creased as shown in Fig. 2 is first made into a rectangular shape by folding the side plates 1, 2, 3, and 4 into squares and gluing the joint piece 5 to the side plate 1 and the inner surface. make it into a shape.

Next, as shown in Figure 3, fold the inner bottom plates 7 and 9 at 14.1.
8, press until fold 15 and fold 19 touch,
Folded tip piece 11.13 into tip piece 10.12
While sandwiched between them, the entire bottom is pressed from both the inside and outside to be thermally bonded.

At this time, the inner surface of the tip piece 10 is also thermally bonded to the outer surface of the outer bottom plate 8, so that the tip pieces 11, 12.
13 is glued between both surfaces and is not visible on the outside.

FIG. 5 shows different developed views of forming the bottom structure according to the present invention, and even if the arrangement of the joint pieces 5 is changed in this way, the same bottom structure can be formed.

Since the present invention is constructed as described above, the abutting portions of the triangular vertices of the inner bottom plate 7°9 are reinforced by the tip pieces 11.13, and these tip pieces 11.13 are also connected to the tips of the outer bottom plates 6 and 8. Since it is glued by the piece 10.12, the bottom seal is good.

Also, since the tip piece 10 is made larger, the other tip pieces 11,
The cut end of 12.13 is not exposed to the outside and is strong against water and humidity from the outside of the container.

Furthermore, the length that requires bending of the boundary line between the tip piece and the bottom plate is the total length of the tip piece 12 and a portion of the tip piece 11.13.
+, 2B only, the folding work is easy and it is convenient when using a thick paperboard provided with an aluminum foil layer.

Although the present invention is primarily suitable for bottom structures and may be combined with any conventional top structure, it is possible to manufacture a container with even better sealing performance if it is adopted for both the bottom and top structures.

[Brief explanation of the drawing]

Figure 1 is a developed view of a typical conventional bottom structure seen from the outside, Figures 2 to 4 show examples of the present invention, Figure 2 is a developed view seen from the outside, and Figure 3 is a stage in the process of assembly and molding. The perspective view and FIG. 4 are bottom views after assembly and molding, and FIG. 5 is a developed view from the outside of a bottom structure according to another embodiment of the present invention. 1.2, 3.4... Side plate, 5... Joint piece, 6, 8... Outer bottom plate, 7, 9...
・Inner bottom plate, 10, 11, 12.13... Tip piece, 14.18... Isosceles triangular fold, 1
5, 16.17, 19°20...Fold.

Claims (1)

[Scope of utility model registration request] or In the structure of the bottom part, each of the bottom plates is provided with a tip piece, and the tip piece 10 of the first outer bottom plate located at the outermost side during assembly and molding is extended more than the other tip pieces 11, 12, and 13. forming a second outer bottom plate tip piece 12;
are formed by notching the left and right ends, and each tip piece 11 of the inner bottom plate
．． 13 is formed by notching the end portion of the side adjacent to the second outer bottom plate by 215 or less of the total length of each piece, and the remaining part is formed by the inner surface of the tip piece 10 of the first outer bottom plate and the outer surface of the second outer bottom plate. A top or bottom structure of a paper container, characterized in that the tip pieces 11, 12, and 13 of the paper container are sandwiched and thermally bonded.