JPH0523458Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a paper container that can be used as an easily assembled paper container containing liquid, a moisture-proof container for powders or solids, a self-supporting retort pouch, or the like.

(Prior Art) In recent years, methods for selling and storing liquid beverages and foodstuffs have become more diverse and sophisticated, and paper containers that are easy to assemble and have high liquid-tightness are needed as they require less storage space. is required in various fields.

Conventional paper containers of this type include, for example, those with a double structure that uses a paper box and a synthetic resin bag, or those that use paper coated with thermoplastic resin and have the bottom heat-sealed using a molding machine. .

(Problem that the invention aims to solve) However, since such conventional paper containers had a double structure of a paper box and a synthetic resin bag, it was necessary to properly place the bag inside the paper box to prevent liquid leakage. There was a problem in that it required work to put it on, which worsened workability.

For containers made of paper coated with thermoplastic resin, there is no need to attach a bag, but the bottom or top of the container is heated using an expensive molding machine.
Because it needed to be folded and heat sealed,
There were problems in that the material cost increased, the process became complicated, and productivity deteriorated. Furthermore, since the heat sealing is done at the same time as the container is assembled, it is natural that the heat sealing is done immediately before filling the contents, which may leave the effects of heat on the contents, resulting in a decrease in quality. There was a problem.

(Purpose of the invention) Therefore, the present invention uses paper coated with a heat-sealable resin film and heat-seals only this resin film before assembly, thereby creating a paper container that is easy to assemble and does not leak. The aim is to obtain it at low cost.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a plurality of side panels formed on a paper material having vertical fold lines and continuous from one end to the other end, and one end of the paper material. from the side panel to cover the joining flap formed through the vertical fold line and joined to the other end of the paper material, and the open end of the top or bottom of the paper material joined in a cylindrical shape by the joining flap. A pair of extension flaps extending through the fold line, and a thermoplastic resin film covering the paper surface on the inside of the cylinder of the cylindrical paper material, the thermoplastic resin film extending from the side panel to the The extension flap has an extension part extending toward the side of the extension flap, and the extension part is heat-sealed to seal the opening at the top or bottom part, and the pair of extension flaps are folded in from the transverse fold line. One extension flap that can cover the entire surface of the top or bottom opening, and the other extension flap that has approximately half the area of the top or bottom opening and can be folded over the outside of one extension flap. The pair of extending flaps are assembled into a concave shape inside the cylinder by a curved line or a plurality of straight horizontal tangent lines formed on the side panel.

(Function) In the present invention, the thermoplastic resin film that covers the paper surface on the inside of the cylinder of the side panel and extension flap is extended from the side panel to the extension flap side, and this extension is heat-sealed to form the paper container. The top or bottom is sealed before assembly. Therefore, a paper container that does not leak can be assembled by simply folding in one and the other extended flaps, and it becomes possible to manufacture a paper container at low cost that does not require folding or pressing.

(Example) Hereinafter, the present invention will be explained based on the drawings.

1 to 4 are diagrams showing a first embodiment of a paper container according to the present invention.

First, the configuration will be explained. In Figure 1, 1
a, 1b, 2a, 2b, 3, 4a and 4b are side panels, each of which has a vertical fold line 5.
10 and is formed on a paper material P that is continuous from one end 11 to the other end 12. A joining flap 14 is formed at one end 11 of the paper material P via a vertical fold line 13, and the joining flap 14 is designed to make the paper material P into a cylindrical shape, as shown in the flat blank state in FIG. It is joined to the other end 12 of the paper material P. From each side panel 1a, 1b, 3 downward in FIG.
8a and 18b are extended, and the extension flap 1
7 is an opening 20 on the bottom 19 side (see FIG. 3) of the paper material P bonded together in a cylindrical shape by the joining flap 14.
The other extended flap is formed in a shape that covers approximately half the area of the flap. As shown in FIG. 3, the extension flaps 18a and 18b are formed large so as to cover the entire surface of the opening 20 on the bottom 19 side of the paper material P bonded together in a cylindrical shape by the joining flap 14. A joining flap 23 formed at one end 21 via a vertical fold line 22 forms an extension flap 18a.
By being joined to the other end 24, the transverse fold line 15
One extension flap 18 is completed which covers the entire surface of the opening 20 through the opening.

Furthermore, when the paper material P is made into a cylinder, a thermoplastic resin film 25 is laminated (coated) on the paper surface that becomes the inside of the cylinder of the paper material P, and the thermoplastic resin film 25 extends from each side panel. It has an extension portion 25a extending toward the installation flap 17, extension flap 18a, and extension flap 18b. This extension 25
After the paper material P is formed into a cylindrical shape as shown in FIG. 2, it is heat-sealed (the heat-sealed portion is indicated by 26), so that the opening 20 in the bottom portion 19 is sealed.

Next, the effect will be explained.

3 and 4 are diagrams showing the assembled state of the paper container of this embodiment.

To assemble such a paper container, each side panel shown in FIG.
The joining flap 23 and the other end 24 are joined and pasted together in a cylindrical shape, and the extension part 2 of the thermoplastic resin film 25 is formed.
The opening 20 in the bottom part 19 is sealed by heat-sealing 5a. At this time, the thermoplastic resin film 2
The remaining portion of 5 (indicated by arrow A in FIG. 2) is truncated. Next, the flat plank shown in FIG. 2 is opened as shown in FIG. 3, one extension flap 18 is folded in the direction shown by arrow B to close the opening 20, and the other extension flap 17 is extended. Fold it to the outside of the flap 18. At this time, the extension flap 17 is folded so as to cover approximately half the area of the extension flap 18. Then the fourth
As shown in the figure, when the extension flap 17 and the extension flap 18 are pushed in the direction of arrow C, the transverse fold line 15a,
Since the flaps 15b and 16 are curved and concave toward each side panel, the extending flaps 17 and 18 are formed along the curved transverse fold line 1.
5 and 16 in a concave shape on the inside of the cylinder (inside each side panel). Although the thermoplastic resin film 25 is not shown in FIGS. In this embodiment, the extended flaps 17 and 18 are formed at the bottom of the paper container. However, it goes without saying that it may be formed on the top of the paper container.

In this way, in this embodiment, the extension flap 17
A paper container that does not leak can be assembled by simply folding in the extension flap 18, and there is no need to heat seal the top or bottom of the paper container during assembly, making it possible to obtain a paper container at low cost.

5 to 8 are diagrams showing a second embodiment of the paper container according to the present invention, and the same components as in the first embodiment are given the same numbers and their explanations will be omitted. In this embodiment, instead of making the horizontal folding lines curved, a plurality of straight horizontal folding lines 31a to 31d are used, and one of the extending flaps 32 consisting of the extending flaps 32a and 32b is formed in a hexagonal shape, and the other one is formed in a hexagonal shape. Extension flap 3
3 is formed into a half shape. In this embodiment, as shown in FIGS. 5 to 8, each side panel is made into a blank by joining the joining flap and the other end 12, and then the extension flap 32 is connected to the arrow D.
After folding the extension flap 33 in the direction shown in FIG. is a plurality of straight horizontal fold lines 31a to 3
1d, it is assembled on the inside of the cylinder, and the same effects as in the first embodiment can be obtained.

9 and 10 are views showing a third embodiment of the present invention, in which one of the extension flaps 41a and 41b is made into an octagonal shape,
The other extended flap 42 is half the shape of the other extended flap 42. In this embodiment, the same effects as in the first and second embodiments can be obtained.

(Effects of the invention) According to the invention, the thermoplastic resin film that covers the paper surface on the inside of the cylinder of the side panel and extension flap is extended from the side panel to the extension flap side, and this extension is heat-sealed. In particular, since the top or bottom of the paper container is sealed before assembly, a leak-proof paper container that is extremely simple to assemble can be obtained at low cost.

[Brief explanation of the drawing]

1 to 4 are diagrams showing a first embodiment of the paper container according to the present invention, in which FIG. 1 is a developed view thereof, FIG. 2 is a blank finished view thereof, and FIG. 3 is an explanatory diagram of its assembly;
Fig. 4 is an assembled and finished drawing of the same, Figs. 5 to 8 are drawings showing a second embodiment of the paper container according to the present invention, Fig. 5 is a developed view thereof, and Fig. 6 is a blank finished drawing of the same. 7 is an explanatory diagram of the assembly, FIG. 8 is a finished assembly diagram, and FIGS. 9 and 10 are diagrams showing the third embodiment of the paper container according to the present invention.
Figure 0 is the blank finished diagram. 1a, 1b...Side panel, 2a, 2b...Side panel, 3...Side panel, 4a, 4b...Side panel, 5...Vertical fold line, 6...Vertical fold line, 7...
Vertical fold line, 8... Vertical fold line, 9... Vertical fold line, 10...
Vertical fold line, 11...one end, 12...other end, 13...
Vertical fold line, 14...Joining flap, 15...Horizontal fold line, 16...Horizontal fold line, 17...Other extension flap, 18...One extension flap, 19...Bottom, 20...Opening, 25 ...Thermoplastic resin film, 2
5a... Extension portion, P... Paper material, 32, 41... One extension flap, 33, 42... Other extension flap.

Claims (1)

[Scope of utility model registration request] a plurality of side panels formed on the paper material having longitudinal fold lines and continuous from one end to the other; and a joining flap formed on one end of the paper material via the longitudinal fold line and joined to the other end of the paper material; and a pair of extension flaps extending from the side panel via a horizontal fold line so as to cover the open end of the top or bottom of the paper material joined in a cylindrical shape by the joining flap, and a cylindrical paper material. a thermoplastic resin film that covers a paper surface on the inside of the cylinder, the thermoplastic resin film having an extension part extending from the side panel to the extension flap side, and the extension part being heat-sealable. the top or bottom opening, and the pair of extending flaps includes one extending flap that can be folded in from the horizontal fold line to cover the entire surface of the top or bottom opening; A pair of extended flaps formed on a side panel, each having an area approximately half the area of the bottom opening and consisting of one extended flap that can be folded over the outside of the other extended flap. Or, a paper container characterized in that it is assembled in a concave shape on the inside of the cylinder by a plurality of straight horizontal tangent lines.