JPH0426332Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid paper container made of thermoplastic resin-coated paperboard, and more particularly to a structure of the container that reduces the gap formed in the container closure.

[Conventional technology]

Such paper containers are made by forming a container body having a square cross section, a top closure, and a bottom closure from thermoplastic coated paperboard. The container body has four side panels separated by vertical fold lines and a joining panel. The top closure of thermoplastic coated paperboard includes a pair of folded closure panels separated from the container body by a common horizontal fold line and their bifold sealing flaps, a pair of closure panels folded into a roof shape and these panels. and a sealing flap of the joining panel.
The container body is formed by heat-sealing the bonding panel and the side panel opposite the bonding panel, and the top closure is formed by attaching the bonding panel to the inner side panel to be bonded. After overlapping and heat-sealing to the fold-in closure panel, the fold-in closure panel is triangularly folded between the roof closure panels via its substantially U-shaped diagonal fold line, and similarly folds into the bi-fold seal flap and the seal flap of the joining panel. is formed by folding the sealing flaps between the sealing flaps of the roof closure panel via vertical fold lines and heat sealing the sealing flaps together in this condition.

[Problem that the invention attempts to solve]

The top closure of such a liquid paper container consists of a double fold of relatively short sealing flaps of an infold closure panel and a joining panel that are folded between relatively tall sealing flaps of a roof closure panel. At this point, it is installed in a filling and sealing machine and sealed.

However, since the thickness of the sealing flap part is different between the folded part of the double-folded sealing flap and the other part, the part of the sealing flap where the paper thickness changes is filled with a filling sheet that is strictly adjusted to correspond to the paper thickness change. The top closing part could not be reliably sealed unless it was positioned and attached with high precision to the stepped part of the mold of the mold. For this reason, such sealing work is complicated and time-consuming.

Therefore, it is an object of the present invention to widen the range of paper thickness changes at both ends of the overlapping portion of seal flaps for forming a top closure, and to reduce the change in paper thickness at both ends of the overlapping portion. It is an object of the present invention to provide a liquid paper container suitably constructed so as to eliminate the above-mentioned problems by reducing the gap formed between the parts.

[Means for solving problems]

The invention consists of bonding one side bonding panel of thermoplastic-coated paperboard to the opposite side edge, folding the fold-in closure panel into a triangular shape, and folding the roof closure panel into a roof shape. In a liquid paper container formed by overlapping and heat-sealing sealing flaps, the upper edge of the sealing flap of the folded closure panel and the joining panel and the upper edge of the sealing flap of the roof closure panel are connected by an inclined edge extending before and after the fold line between these panels. The seal flaps are joined together to form dam portions located at both ends of the seal flap overlapping portion.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings. FIG. 1 is a perspective view showing the structure of an example of a liquid paper container according to the present invention, and FIG. 2 is a developed view of this liquid paper container. The thermoplastic resin-coated paperboard used for liquid paper containers has first to fourth side panels 1 to 4, which are divided by vertical fold lines 5 and form the main body of the container;
Closure panels 8-11 separated from each side panel by a common horizontal fold line 6, 7 and forming a top closure and sealing flaps 12 of these closure panels 8-11.
~15 and a closure panel 17-2 separated from each side panel by a lower horizontal fold line 16 and forming a bottom closure.
0, separated from the side panel by a vertical fold line, and the fourth
It consists of a side panel 4, a joining panel 21 which continues on the side of the closing panels 11, 20, and a sealing flap 22 separated from the joining panel by a horizontal fold line 7. The closing panels 9 and 11 both have a center line of the horizontal fold line 7 on the panel and a horizontal line 6 on the panel.
There is a diagonal fold line 22 connecting both ends of the flap, and a fold line 23 that is aligned with the fold line 22 is also included in the joining flap.
These panels can be folded into a triangular shape between the roof closure panels 8, 10 along the fold lines 22, 23.

The upper sealing flaps of the closing panels 9, 11 also have a vertical fold line 24 in the center of these flaps, so that they can be folded in half and folded between the roof sealing flaps 12, 14. Roof sealing flaps 12, 14
is higher than the height of the bifold sealing flaps 13, 15 and the sealing flap 22 of the joining flap, and the sealing flaps 13, 15, 22 are completely folded into the sealing flaps 12, 14. Adjacent tall seal flaps and short seal flaps are connected smoothly, i.e., the upper edges of these seal flaps of different heights are connected by a curved line extending before and after the fold line between the panels. Dam portions are formed at both ends of the sealing flaps 13, 15, 22 at the inclined edges 25. Since the dam part has a constant width in the height direction, the range in which the paper thickness of the seal flap overlapping part changes has a constant width in the height direction.

The bottom closing portion is formed by heat-sealing the closing panels 18, 20 by partially overlapping each other while folding the closing panels 17, 19 into a triangular shape along the diagonal fold line 24.

In a liquid paper container having such a structure, the container is mounted on a sealing machine and sealed so that a portion of the dam portion is aligned with the stepped portion of the mold of the filling and sealing machine.

Further, in a liquid paper container having such a structure, changes in paper thickness can be reduced at both ends of the overlapping portion of the seal flaps for forming the top closing portion of the container. That is, at one end of the overlapping part,
From the stack of 5 seal flaps 14, 15, 15, 22, 12, the seal flap 14, the inclined edge 25
The dam consists of four flaps 12, and further changes to two flaps 14 and 12.

Flaps 12, 13, 1 at the other end of the overlapping part
It changes in the same way from the 4-ply stack of 3 and 14. Therefore, the gap created at the portion where the paper thickness changes in the overlapping portion of the sheets becomes extremely small.

FIG. 3 is a developed view showing the structure of another example of the liquid container according to the present invention. Since this embodiment differs from the embodiment shown in FIG. 2 only in the shape of the dam part, similar parts are given the same reference numerals and similar explanations will be omitted. In this example, a straight beveled edge 26 is formed between a relatively tall sealing flap and a relatively short flap that smoothly connects both sealing flaps.

[Effect of idea]

As is clear from the above description, according to the liquid paper container according to the present invention, an inclined edge is provided between the relatively tall seal flap and the relatively short seal flap of the top closing portion to smoothly connect these seal flaps. Therefore, at both ends of the overlapped portion of these seal flaps, the area where the paper thickness changes can have a constant width in the height direction, and the change in paper thickness at the overlapped portion can be reduced, making it possible to create a part where the paper thickness changes. The gap can be made considerably smaller. Therefore, when sealing a container, the folded container blank can be easily mounted on a filling and sealing machine to reliably seal the container. This has the advantage of shortening working time and lowering manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the configuration of an example of a paper container for liquid according to the present invention, FIG. 2 is a developed view of the paper container for liquid shown in FIG. 1, and FIG. FIG. 2 is a developed diagram showing the configuration of an example. 1... liquid paper container, 12, 14... relatively tall sealing flap, 13, 15, 22... relatively short sealing flap, 25, 26... sloping edge.

Claims (1)

[Scope of utility model registration request] One side bonded panel of thermoplastic coated paperboard,
In a liquid paper container, the inner folding closure panel is folded into a triangular shape, the roof closure panel is folded into a roof shape, and the sealing flaps of these panels are overlapped and heat sealed. The upper edge of the sealing flap of the folding closure panel and the joining panel and the upper edge of the sealing flap of the roof closing panel are joined by an inclined edge extending before and after the fold line between these panels, and a dam part is located at both ends of the overlapping area of the sealing flap. A liquid paper container characterized by forming a liquid paper container.