JPH0318330Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a blank for a rectangular parallelepiped sealed container in which milk or the like is stored.

Conventional technology and its problems In the above-mentioned blank, crease lines are formed in a predetermined pattern at locations that are to be occasionally bent during container formation, and by folding the blank along the crease lines, the blank becomes a rectangular parallelepiped. Becomes a container.

By the way, the process of forming a container involves bending the triangular ears that protrude horizontally from the container body downward and fixing them to the side wall of the container body. showed a tendency to return to its original shape due to springback, and a large force was required to fix the triangular ears to the side wall of the container body in order to maintain the bent state of the triangular ears.

The purpose of this invention was to reduce the spring back force when bending the triangular flange as much as possible by improving the fold line pattern, and to create a container blank that requires less force to fix the triangular flange. It is about providing.

Means for solving the problem The rectangular parallelepiped sealed container blank according to this invention is
A bow-shaped fold line that swells downward is formed at the boundary between the side wall of the container body and the triangular ear that is bent downward to overlap the same side wall and fixed there. It is something.

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

First, before explaining the blank, the container made from the blank will be explained. As shown in FIG. 12 and 13. Here, front and rear are defined as the direction diagonally downward to the right in FIG. 4, the front is the opposite side, and the left and right are defined as facing the rear. There are also two triangular ears on the bottom of the container body 11, but these are not shown. The container body 11 has front, rear,
It includes left and right side walls 14 to 17 and a top wall 18. The bottom wall is not shown in FIG.
Seal portions 19 are present on the top wall 18 and the left and right triangular ears 12 and 13. Left and right triangular ears 12,
13 are the same, so to explain the left triangular lug 12, this is a container material 2 consisting of a back side component 21 connected to the upper end of the left side wall 16 and a front side component 22 connected to the left end of the top wall 18. The two components 21 and 22 are both bent downward and overlapped on the left side wall 16, and a part of the overlaid back side component 21 is fixed to the left side wall 21. (See Figures 5 and 6).

Now, the blank that will become the container described above is shown in FIG. 1, and FIG. 1 shows the upper half of the blank as seen from the outside of the container.

The blank is formed with fold lines in a predetermined pattern, which pattern is well known except for the features described below. The characteristic point is that there are bow-shaped fold lines 35, 36 that swell downward at the boundaries of the parts 31, 32 that become the left and right side walls 16, 17 and the parts 33, 34 that become the left and right triangular ears 12, 13. It is being formed. Same fold line 35, 36
The conventional one corresponding to this was a straight line.

FIG. 2 shows an enlarged view of one of the two fold lines 35, 36 mentioned above. The fold line 35 forms a smooth curve so as to be part of the same arc.
As a result, in the portion 33 that will become the triangular lug 12, there is a protrusion 38 that protrudes downward from the straight line 37 connecting both ends of the fold line 35, and the protrusion amount h of the protrusion 38 is determined by the thickness of the container material. It is about 1 to 2 times the size. Moreover, instead of forming the fold line into a smooth curve as described above, the fold line may be formed into a V-shape as shown in FIG.

FIGS. 5 and 6 show in an exaggerated manner the bending process of the triangular ears during container formation. In FIG. 5, the triangular ear 2 is shown in a horizontally protruding state. At this time, triangular ear 12
The back side component 21 is attached to the side wall 16 along the fold line 35.
As a result of the bending, the downward protrusion 38 existing in the portion 33 that will become the triangular lug 12 presses the same side wall 16 inward, and the same side wall It is curved inwardly to include the upper edge of 16. From the state shown in FIG. 5, the triangular ear 12 is bent downward and the sixth
In the state shown in the figure, the degree of curvature of the side wall 16 is further extended. When the triangular lug 12 bent to the state shown in FIG. 6 attempts to return to the original state shown in FIG. However, since a considerable amount of force is required to turn a curved object into a flat one, this force resists the springback force, causing the triangular ear 12 to return to its original shape. It is becoming difficult to return to normal condition.

For comparison, FIG. 8 shows a triangular selvage 41 bent along the fold lines of a conventional pattern, but after the triangular selvage 41 is bent, the side wall 42 remains flat. , the spring back force of the triangular lug 41 acts in a direction to make the triangular lug 41 stand up.

Effects of the invention According to this invention, when a triangular selvage is formed by folding a blank along the crease line, the side wall connected to the base of the triangular selvage is curved so that the horizontal section has an inward bow shape. , the presence of the curved portion reduces the spring back force of the triangular selvedge, and less force is required to fix the triangular selvedge.

[Brief explanation of the drawing]

Figures 1 to 7 show examples of this invention,
Figure 1 is a front view, Figure 2 is an enlarged front view of a part of Figure 1, Figure 3 is a front view equivalent to Figure 2 showing another embodiment, and Figure 4 is a completed container. A perspective view showing the state, FIGS. 5 and 6 are partial vertical sectional views of the container showing the container forming process, FIG. 7 is a sectional view taken along the - line in FIG. 6, and FIG. 8 shows a conventional example. 6 is a longitudinal sectional view corresponding to FIG. 6. FIG. 11... Container body, 12, 13... Ear, 16, 17
...Side wall, 31-34...part, 35, 36...fold line.

Claims (1)

[Scope of utility model registration request] Portion 3 that becomes the side walls 16 and 17 of the container body 11
1 and 32, and triangular ears 1 bent downward so as to overlap on the same side walls 16 and 17 and fixed thereto.
A blank for a rectangular parallelepiped sealed container, in which bow-shaped fold lines 35 and 36 that swell downward are formed at the boundaries of portions 33 and 34 that become parts 2 and 13.