JPH0723051Y2 - Center block for forming aluminum foil folding containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a center block used for forming a container by folding an aluminum foil.

[Background of the invention]

As shown in FIG. 9, a target aluminum foil folding container 1 includes a bottom wall 2, a side wall 3 rising from the peripheral edge thereof,
It is composed of a flange 5 and an edge winding 6 provided around the opening 4.

When folding such a container 1, the side wall 3 is first erected and the surplus corner portion 7 is bent from the edges 8 and 8 of the adjacent side walls 3 and 3 as shown in FIGS. 10 and 11. Overlap the end portions of the side walls 3 and 3, and further fold back portions 9 and 9
I fold it over and make it a triple layer to make it adhere.

[Challenges for devising]

The above-described molding is performed by a molding die. However, when the corner portion of the center block (male mold) that molds the inner surface of the container has a square shape, the folded portions 9, 9 that follow the bottom wall 2 are formed.
The starting point 10 is concentrated at one point as shown in FIG. 10, and there is a drawback that it is easily damaged.

For this reason, the corner portion of the center block is rounded, but the folded-back portion 9 following the bottom wall 2,
It is not possible to predict where the starting points 10 and 10 of 9 will start in the rounded shape, and the folding lines of the folding portions 9 and 9 will bend or intersect, resulting in a disadvantage that the finish of the corner portion 7 of the container is not good. .

Therefore, an object of the present invention is to provide a center block in which a corner portion of a folding container is not damaged and which has a good finish.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention relates to a center block for molding a folding container in which an aluminum foil is folded to form a bottom wall and a side wall, and a surplus portion is overlapped with a corner portion between adjacent side walls. A bottom wall and a side wall of the container, and a top surface, a side surface, and a corner that are pressed against the inner surface of the corner portion, respectively, and a chamfered portion having a substantially triangular shape is provided at a corner portion where the top surface and the corner intersect. Was adopted.

[Action]

When folding an aluminum foil blank, first, each side wall is bent from the bottom wall. At this time, the surplus portion naturally bulges between the adjacent side walls.

When the surplus portion is bent and overlapped on both side walls adjacent to each other, the chamfered portion having a substantially triangular shape is provided at the corner portion of the center block. Therefore, while the top surface of the center block is pressed against the bottom wall, the surplus portion is formed. When pressing and stacking on both side walls, the starting point from the bottom wall of the folded back part becomes two points of the bottom side of the substantially triangular shape, so that it is almost equally divided and overlapped on the end parts of both side walls, and the starting point Does not concentrate, so it will not be damaged.

〔Example〕

First, an outline of an example of a mold for a folding container will be described with reference to FIGS. 1 and 2.

As shown in the figure, the forming die comprises an upper die 20 and a lower die 30, and the upper die 20 has a first guide 21 for bending the side wall 3.
And a guide recess 22 for folding the corner 7 of the container into a bag shape.
And a second guide 23 for superposing the corner portion 7 on the side wall 3.

On the other hand, the lower mold 30 comprises a center block 31 and a ring 32 for molding the flange 5 of the container. The molding member for the edge winding 6 is omitted.

Now, as shown in FIG. 1, the blank B made of aluminum foil is inserted into the upper die 20 and the lower die 30 at predetermined positions, and the upper die 20
When approaching the lower mold 30, the center block of the lower mold 30
As the top surface 33 of 31 abuts on the blank B and the upper die 20 descends, the first guide 21 raises the side wall 3 of the container.

At this time, a gap is provided between the end edges of the adjacent guides 21 and 21, as can be understood from FIG.
As shown, the excess portion 11 of the side wall 3 of the container bulges outward from the guide 21.

The bulging portion 11 fits into the guide recess 22 descending from the outside of the first guide 21, is gradually folded along the guide recess 22 into a flat shape as shown in FIG. 4, and further descends. By the second guide 23, as shown in FIG. 5, the corner portions 7 are formed by being superposed so as to be in close contact with the end portions of the side walls 3.

In the process as described above, the center block 31 is
Upper mold first guide 21, second guide 23 and guide recess
In cooperation with 22, the inner surface of the bottom wall 2 and the inner surface of the side wall 3 and the space between the corner portions 7 of the container are pressed to form these, and as shown in FIGS. 6 and 7, as shown in FIGS. Since a chamfered portion 35 having a substantially triangular shape is provided at a corner portion where the top surface 33 intersects, as shown in FIGS. 3 to 5, when the bulging portion 11 is gradually folded, the substantially triangular shape is provided. Since the bottom side (side on the top surface 33 side) is pressed against the corner of the bottom wall 2 of the container, as shown in FIG. The parts 9, 9 are equally divided into a linear shape.

The corner 36 of the center block 31 may have a rounded shape as shown in FIG. 6 or an angular shape as shown in FIG. 7, and the planar shape is not limited to a quadrangle.

〔effect〕

According to this invention, as described above, since the chamfered portion having a substantially triangular shape is provided at the corner where the corner and the top surface of the center block intersect, it becomes the bottom wall of the container when the aluminum foil is folded and formed. Since the bottom side of the triangular chamfer is pressed against the corner of the surface and the starting point of the folding part when bending the corner of the container is two points, the starting point is not damaged and the folding part Is bisected and the folding line is linear, so that a folded container having a favorable appearance can be obtained.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an example of a molding die, FIG. 2 is a bottom view of the same, FIG. 3 to FIG. 5 are diagrams showing a folding process, and FIGS. 6 and 7 are center blocks. Perspective view of the eighth
FIG. 9 is an enlarged perspective view of the corner portion of the container, FIG. 9 is a perspective view of the container, and FIGS. 10 and 11 are plan views showing the corner portions of the container molded using the center block. 20 …… Upper mold, 21 …… First guide, 22 …… Guide recess,
23 …… Second guide, 30 …… Lower mold, 31 …… Center block, 33 …… Top surface, 34 …… Side surface, 35 …… Chamfer, 36 ……
corner.

Claims (1)

[Scope of utility model registration request] 1. A center block for molding a folded container, in which a bottom wall and a side wall are formed by folding an aluminum foil, and a surplus portion is superposed on a corner portion between adjacent side walls. Aluminum having a top surface, a side surface, and a corner that are pressed against the wall, the side wall, and the inner surface of the corner portion, respectively, and a chamfered portion having a substantially triangular shape is provided at a corner portion where the top surface and the corner intersect. Center block for forming foil folding containers.