JPS5827927Y2 - Bottom structure of the container - Google Patents

Description

[Detailed description of the invention] The present invention is a liquid container that is assembled from a paperboard material with a thermoplastic synthetic resin coating on both sides, has a rectangular cross section, and has a spout that can be folded and unfolded at the top, forming the bottom part. Fold and/or fold each row to form the bottom.
Alternatively, the present invention relates to a bottom structure of a container that provides a bottom with no pinholes without damaging the thermoplastic synthetic resin on the inner surface of the piece constituting the bottom during molding.

In a conventional container of this kind, as shown in FIG. 1, the bottom B' is connected to the left and right ends of the elongated rising piece 6' connecting the apexes of the triangular pieces 1' and 3', and the bottom piece 4' and the glue margin, respectively. Piece 5'
and P' are smooth sloped surfaces, so when these bottom component pieces are folded along the fold lines to assemble the bottom, the end surfaces of the materials interfere with each other during the temporary folding and/or forming stage.
After molding and filling, the thermoplastic synthetic resin such as polyethylene, aluminum foil, etc. on the surface in contact with the contents will peel off, causing liquid leakage.

That is, at the time of temporary folding, as shown in FIG.
The lower end of the rising piece 6', which corresponds to the apex extension of ', is bent, and the tips 9' and 10' of this bent part interfere with the inner surface of the bottom piece 4' and damage the thermoplastic synthetic resin. 1, which comes into contact with the contents as shown in Figure 3.
A pinhole is generated at 5', causing liquid leakage.

In particular, there was no problem with this point in the conventional process of temporarily folding and then heating to melt the thermoplastic synthetic resin. The folding process is a big problem because the thermoplastic synthetic resin is easily damaged.

The present invention, which was conceived in view of the above points, will be explained in detail based on the embodiments shown in the drawings.

First, as shown in FIG. 4, the container bottom B of the present invention has rectangular bottom pieces 1, 2, 3.4 attached to the side walls 11, 12, 13, 14 of the body through horizontal fold lines. The side wall 11. A glue margin piece 5 is connected to the free end of the bottom piece 1 via a vertical fold line, and each of the bottom pieces 1 and 3 is an apex of a right-angled isosceles triangle whose base is the horizontal fold line. Each of the above 2 sides with the two sides sandwiching the corner as the inward fold line of the container.
A folding line is provided on the line connecting the two right-angled vertices, and the bottom piece 2 and the bottom pieces 1 and 3 adjacent to the bottom piece 2 are bent inward through the folding line over approximately half the width of the bottom piece 2 and the bottom pieces 1 and 3 adjacent to the bottom piece 2. A series of rising pieces 6 are provided.

In addition, pieces 7 and 8 having lower ends inclined downward starting from the left and right lower ends of the rising piece 6 are connected to the lower ends of the bottom pieces 1 and 3 on both the left and right sides of the bottom piece 2, respectively. The degree of inclination of the lower end changes at the intermediate point, and among the lower ends of the pieces 7 and 8, the inclination of the half farther from the rising piece 6 is gentler than that of the nearer half.

Here, the horizontal fold line forming the rising piece 6 at the tip of the bottom piece 2, the extension line thereof, the lower end of the rising piece 6, the adjacent point between the rising piece 6 and pieces 7 and 8, and pieces 7.8 c, l), a and C', b', a, respectively.
', then (1) a>b>c a'>b'>C' (2) a=a', b=b', and c=c'.

The bottom structure of the present invention is as described above, but when assembling the bottom, the shape of the mandrel is carved in a conventional manner so that the shape of the bottom as described above fits perfectly. The outside of the bottom is heated and pressurized using a backing plate so that it is flat.

As described above, the present invention has a rising piece 6 and pieces 7 and 8 on both the left and right sides.
The lower end is inclined downward, and among the lower ends of pieces 7 and 8,
Since the slope of the half farthest from the rising piece 6 is gentler than that of the nearer half, when folding the bottom piece 1.3 into the bottom pieces 2, 4 and/or completely folding it in, the bottom In the molded state, the material end faces of the bent tips 9 and 10 of the pieces 7 and 8 on the extension of the apex of the triangular piece in the bottom piece 1.3 are the same as shown in Fig. 5. Since it is on a flat surface, the thermoplastic synthetic resin on the inner surface of the bottom piece 4 will not be damaged and pinholes will not be generated, and even if a scratch occurs, the scratch will come into direct contact with the contents as shown in Figure 6. This has an excellent effect in that liquid leakage does not occur because the liquid is located in the area 15 where the liquid does not leak.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and are shown in Figures 1 to 3.
The figure is an explanatory diagram showing the bottom structure of a conventional container, Fig. 4 is a partially cutaway developed plan view showing the present invention, Fig. 5 is a partially cut away perspective view showing the process of assembling the present invention, and Fig. 6 FIG. 1 is a partially cutaway vertical cross-sectional view of the present invention. 1, 1', 2.2', 3.3', 4.4'...
・Bottom piece, 5,5'...Glued piece, 6.6'...
...Rising piece, 7, 8... piece, 9.9',
10", 10'...Tip, 15'...
Points that come into contact with the contents, 15... Points that do not come into contact with the contents.

Claims (1)

[Scope of utility model registration request] Bottom structure of a container with a rectangular cross section, made of a material having thermoplastic synthetic resin layers on both sides and having a spout that can be folded and expanded at the top, bottom pieces 1, 2, 3.4 forming the bottom.
Of these, the bottom piece 4 and the glued piece 5 at the end of the bottom piece 1 are formed longer in the vertical direction than the remaining bottom pieces 1, 2.3, and a rising piece 6 is provided at the lower end of the bottom piece 2 via a broken line. , the rising pieces 6 are provided at the lower ends of the bottom pieces 1 and 3 on both the left and right sides of the bottom piece 2, respectively.
Pieces 7 and 8 having lower ends sloping downward starting from the left and right ends of are arranged in a row, and of the slanted lower ends, the half of each farthest from the rising piece 6 is sloped more gently than the half of the nearer half. After forming a cylindrical body from the raw material, fold the bottom pieces 1 and 3 so that they are located inside the bottom pieces 2 and 4, and insert a piece 7°8 between the rising piece 6 and the lower part of the bottom piece 4. The bottom structure of the container is made by adhering the two pieces to each other in a sandwiched state, and then folding the rising piece 6 onto the bottom piece 2 and adhering it.