JP2594744Y2 - Liquid paper container - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid paper container, such as milk, juice or a refillable liquid detergent, which can be boxed from a single blank made of a paper laminated material and is less likely to leak. Things.

[0002]

2. Description of the Related Art Conventionally, liquid paper containers made of paper laminated material having a roof shape or a flat rectangular parallelepiped top surface, such as milk, juice and alcoholic beverages, have been widely used.
In addition, a self-standing container for liquids such as juice, oils and fats, and a liquid detergent for refilling, which is generally called a standing pouch and made of a resin film whose bottom is W-folded, is used.

[0003]

[Problems to be Solved by the Invention] In connection with recent waste disposal problems related to the global environment, in the case of milk, juice and liquid detergent for refilling, conventional plastic liquid bottle containers and resin are used. There is an increasing tendency to adopt a liquid paper container made of a paper laminated material, which is easy to process and dispose at the time of disposal, instead of a film-made self-contained container for liquid.

However, in the case of the liquid paper container made of a paper laminated material having a roof shape or a flat rectangular parallelepiped top surface, the side surface of the liquid paper container is heated while the end surface of the paper laminated material is in contact with the contents. It is made by fusing and box making,
In addition, the upper or lower surface of the liquid paper container is formed by stacking three or more paper laminated materials and heat-sealing them to make a box, and further, the lower side surface of the vertically long rectangular parallelepiped liquid paper container is the weight of the contents. As a result, the liquid paper container swells (referred to as swelling), which causes liquid leakage or damage of the liquid paper container, and is not preferable in appearance.

[0005] In the case of a self-standing container for liquid made of a resin film whose bottom is generally W-folded, which is commonly referred to as a standing pouch, since the resin film is soft, the self-standing container for liquid is opened and the contents are opened. There is no problem in using up all at once, but there is a problem that the self-supporting container for liquid loses its independence when a part of the contents remains.

[0006]

In order to solve the above-mentioned problems, the present invention, as shown in FIG. 1, uses rectangular fold lines (b, b) to form rectangular, oblique Crease line
An upper front plate (10) in which upper folded pieces (11, 11) provided with (d) are connected to the left and right sides, and a front plate (20) in which side front plates (21, 21) are connected to the left and right sides. , Bottom folded pieces (3, 3) with diagonal fold lines (d, d)
(31) on the left and right sides and a slightly drum-shaped bottom plate (30) with a horizontal fold line (e) in the center and rear side plates (41, 41) on the left and right sides Rear plate (50) with upper folded pieces (51, 51) with diagonal fold lines (d) connected to the left and right sides
And a horizontal fold line (g), a horizontal fold line (f, f) having two bent portions (i, i) and a horizontal fold line (g) , Left, right, up and down, the side heat fusion piece (60, 60) and the upper heat fusion piece (61, 61) with the vertical fold line (c, c)
And the horizontal fold line (h, h) and the front plate (20)
Lower part, upper part of bottom plate (30) and rear plate (40) (lower part in FIG. 4)
And the bent part (i, i) of the horizontal fold line (f, f)
A liquid paper container blank made of a paper laminated material having at least an inner surface laminated with a heat-fusible resin layer, provided with two vertical fold lines (a, a) passing through the blank. First, the horizontal fold line (e) is mountain-folded, and the inner surfaces of the left and right side heat fusion pieces (60, 60) are heat-sealed to each other in a plane, and the respective fold lines (b, b, c , c, d, d, d, d, f, f) are folded in a mountain or valley, and as shown in FIG. 4, the blank of this liquid paper container is made into a rectangular parallelepiped box having an open upper surface. Fold the left and right bottom folded pieces (31, 31) that protrude in a triangular shape and
0), the contents are filled, the inner surfaces of the upper upper heat-fused pieces (61, 61) are heat-sealed in a flat shape and sealed, and the remaining fold lines (d, d , d, d, g, g, h, h) are folded in a mountain or valley, and the upper front plate (10) and the upper rear plate (50) are boxed in the same plane, and formed into a triangular shape. Left and right upper folded pieces (1
1,51,11,51) is folded back and adhered to the side plate (21,41,21,41). It is to provide a liquid paper container with less worry.

[0007] The present invention, as shown in FIGS.
A slightly drum-shaped bottom plate (32) is continuously provided instead of the slightly drum-shaped bottom plate (30) of the liquid paper container blank shown in FIG. The present invention provides a liquid paper container having a different shape which can be box-formed from a single blank made of the same and is less likely to leak liquid.

Further, as shown in FIGS. 3 and 6, the present invention provides rectangular front side plates (21, 21) and rear side plates (41) of the liquid paper container blanks shown in FIGS. , 41), instead of trapezoidal side front plates with a slightly narrow upper part
(22, 22) and side rear plates (42, 42) are connected in series. Similarly, it is possible to make a box from a single blank made of paper laminated material, and there is less fear of liquid leakage. A liquid paper container having a different shape is provided.

[0009]

FIG. 1 is a plan view of a blank of a liquid paper container according to a first embodiment of the present invention. That is, the vertical fold line (b, b)
The upper front plate (1) in which upper folded pieces (11, 11) each having a rectangular, oblique fold line (d)
0) and the front plate (20) with the side front plates (21, 21) connected to the left and right sides
And a slightly folded bottom plate (e.g., a bottom folding plate (31, 31) with diagonal fold lines (d, d) connected to the left and right sides and a horizontal fold line (e) in the center) 30), the rear plate (40) with side rear plates (41, 41) connected to the left and right sides, and the upper folded pieces (51, 51) with diagonal fold lines (d) connected to the left and right sides With the rear plate (50)
The left and right sides of the blank successively arranged via the horizontal fold line (g) and the horizontal fold line (f, f) having the two bent portions (i, i) and the horizontal fold line (g), On all upper and lower sides, side heat-sealed pieces (60,6
0) and the upper heat-fused piece (61, 61) are connected continuously through the vertical fold line (c, c) and the horizontal fold line (h, h), and the lower part of the front plate (20) 2 passing through the bent portion (i, i) of the horizontal fold line (f, f) over the bottom plate (30) and the upper portion (the lower portion in FIG. 4) of the rear plate (40).
A liquid paper container blank made of a paper laminated material having a heat fusible resin layer laminated on at least the inner surface thereof, provided with a vertical fold line (a, a) of a book, and a 30 μm polyethylene layer laminated on the inner surface. Using 310 g / m ² unbleached kraft cardboard,
Normal printing on the outer surface, using a punching die in a normal punching process, with a height, width, height of about 5cm, 9cm and 13cm, and a refillable liquid detergent with a capacity of 500ml. FIG. 1 shows a state in which a blank of a liquid paper container for use is manufactured.

FIG. 4 is a perspective view showing the liquid paper container according to the first embodiment in a state where the contents are filled and the container is made. That is, first, the horizontal fold line (e) of the liquid paper container blank shown in FIG. 1 is mountain-folded (the outer surface (printing surface) side becomes a mountain, the same applies hereinafter) and the left and right side heat-fused pieces (60 , 60) are heat-sealed to each other in a plane, and the respective fold lines (b,
b, c, c, d, d, d, d, f, f) are folded in a mountain or valley (outside (printed side)
(The sides are troughs, the same applies hereinafter.) Then, the blank of this liquid paper container is made into a rectangular parallelepiped box with the top open, and the left and right bottom folded pieces (31, 31) protruding in a triangular shape are folded back to form a bottom plate. (3
0), the contents are filled, the inner surfaces of the upper upper heat-fused pieces (61, 61) are heat-sealed in a flat shape and sealed, and the remaining fold lines (d, d , d, d, g, g, h, h) are folded in a mountain or valley, and the upper front plate (10) and the upper rear plate (50) are boxed in the same plane, and formed into a triangular shape. Left and right upper folded pieces (1
1, 51, 11, 51) are folded back and adhered to the side plates (21, 41, 21, 41).

In the liquid paper container of this embodiment, first, the horizontal fold line (e) is mountain-folded so that the right and left side heat-sealing pieces (60, 60)
After the inner surfaces of the upper heat-fused pieces (61, 61) are heat-sealed in a plane, and after the contents are filled with a refill liquid detergent, Because the sealing is performed by heat sealing in a state where the end face of the paper laminated material does not come into contact with the contents, and because three or more paper laminated materials are not stacked and thermally fused. Thus, a liquid paper container is obtained in which these planar heat seals are complete and can be made from one blank made of a paper laminate material, and are less likely to leak.

In the liquid paper container of this embodiment, as shown in FIG. 1, a slightly drum-shaped bottom plate (30) is provided.
Connected through horizontal fold lines (f, f) having bent portions (i, i) at the lower part of the front plate (20), the bottom plate (30) and the rear plate (40)
And two vertical fold lines (a, a) passing through the bent part (i, i) of the horizontal fold line (f, f) over the upper part (the lower part in FIG. 4).
Is provided, and each fold line is mountain-folded or valley-folded to form a rectangular parallelepiped box, as shown in FIG.
A rectangular parallelepiped liquid with the lower part of the front plate (20) and the rear plate (40) slightly depressed and the bottom plate (30) slightly expanded along the two vertical fold lines (a, a) A paper container was obtained, and a liquid paper container having a preferable appearance was obtained, in which the swelling of the lower portion of the front plate (20) and the rear plate (40) was prevented with respect to the weight of the contents. Things.

As for the paper laminated material of the present invention, in which a heat-fusible resin layer is laminated on at least the inner surface, an appropriate heat is applied to the inner surface by using a suitable paperboard of 190 to 400 g / m ² having rigidity. In addition to laminating the fusible resin layer, an appropriate tough resin layer, low-adsorption resin layer, aluminum foil layer, etc., depending on the type of contents to be filled and the required characteristics, on the outer surface or inner surface
The paper laminated material laminated on the (intermediate layer) side can be used without restriction.

<Embodiment 2> FIG. 2 shows a slightly drum-shaped bottom plate (30) of the liquid paper container blank shown in FIG. 1 in Embodiment 2 of the present invention. It is a top view of the blank of the liquid paper container provided with the bottom plate (32) in a row. That is, the vertical fold line
oblique fold lines (d), each rectangular through (b, b)
Front plate (10) with upper folded pieces (11, 11) provided on the left and right sides with front, and front plate with side front plates (21, 21) connected on the left and right sides
(20) and the bottom folded piece (31,3) with the diagonal fold line (d, d)
After the 1) is connected to the left and right sides and a slightly drum-shaped bottom plate (32) with a horizontal fold line (e) in the center and the side rear plates (41, 41) are connected to the left and right sides Top plate (50) with a face plate (40) and upper folded pieces (51, 51) with diagonal fold lines (d) connected to the left and right sides
And a horizontal fold line (g), a horizontal fold line (f, f) having two bent portions (i, i) and a horizontal fold line (g) , Left, right, up and down, the side heat fusion piece (60, 60) and the upper heat fusion piece (61, 61) with the vertical fold line (c, c)
And the horizontal fold line (h, h) and the front plate (20)
Lower part, bottom plate (32) and upper part of rear plate (40) (lower part in FIG. 5)
And the bent part (i, i) of the horizontal fold line (f, f)
A liquid paper container blank made of a paper laminated material having at least an inner surface laminated with a heat-fusible resin layer, provided with two vertical fold lines (a, a) passing through the same as in Example 1. Using a non-bleached kraft cardboard of 310 g / m ² in which a 30 μm polyethylene layer is laminated on the inner surface, a normal printing is performed on the outer surface side, and a vertical punching process using a punching die is performed. This figure shows a state in which a blank of a liquid paper container for a refillable liquid detergent having a height of about 5 cm, 9 cm, and 13 cm and a content of 500 ml is prepared.

FIG. 5 is a perspective view of the liquid paper container according to the second embodiment in a state where the contents are filled and the container is made. That is, as in the first embodiment, the horizontal fold line (e) of the blank of the liquid paper container shown in FIG. Heat-sealed in a plane, and each fold line (b, b, c, c, d, d, d, d, f,
f) is folded in a mountain or in a valley, the blank of this liquid paper container is made into a rectangular parallelepiped box with an open top, and the left and right bottom folded pieces (31, 31) protruding in a triangular shape are folded back to form a bottom plate. (32)
After adhering to the contents, filling the contents
The inner surfaces of (61, 61) are heat-sealed and sealed in a plane,
The remaining fold lines (d, d, d, d, g, g, h, h) are folded in a mountain or valley, and the upper front plate (10) and the upper rear plate (50) are formed in the same plane. After making the box, the left and right upper folded pieces (11,5
1,11,51) are folded back and adhered to the side plates (21,41,21,41).

In the liquid paper container of the present embodiment, as in the first embodiment, the horizontal fold line (e) is firstly mountain-folded so that the inner surfaces of the left and right side heat fusion pieces (60, 60) are flat. After filling with a liquid detergent for refilling, the inner surfaces of the upper heat-sealed pieces (61, 61) are heat-sealed flat and sealed together. As a result, heat-sealing is performed in a state where the end face of the paper-laminated material does not contact the contents, and heat-sealing of three or more paper-laminated materials is not performed. The liquid paper container obtained was completely heat-sealed, was similarly box-formed from one blank made of a paper laminate material, and was less likely to leak liquid.

Further, in the liquid paper container of the present embodiment, as shown in FIG. 2, a slightly drum-shaped bottom plate (32) is provided.
In the same manner as in the first embodiment, the lower part of the front plate (20) and the bottom plate (32) are connected to each other via a horizontal fold line (f, f) having two bent portions (i, i). 2 through the bent portion (i, i) of the horizontal fold line (f, f) across the upper portion (the lower portion in FIG. 5) of the rear face plate (40).
By providing the vertical fold lines (a, a) of the book, and folding each fold line into a rectangular parallelepiped box by folding in a mountain or valley, as shown in FIG. 5, two vertical fold lines are formed. A liquid box having a rectangular parallelepiped shape in which the lower part of the front plate (20) and the rear plate (40) is slightly swelled and the bottom plate (32) is slightly depressed along (a, a) A liquid paper container having a shape different from that of the first embodiment, which makes the swelling of the lower part of the front plate (20) and the rear plate (40) inconspicuous with respect to the weight of the contents, and is also preferable in appearance. It is obtained.

<Embodiment 3> FIGS. 3A and 3B show a rectangular front side plate (21, 21) and a side rear plate of the liquid paper container blank shown in FIGS. 1 and 2, respectively, in Embodiment 3 of the present invention. (41, 41), and the trapezoidal front side plates (22, 22) and the rear side plate (4
2, 42) is a plan view of a blank of the liquid paper container provided in series. That is, the upper folded piece (1) provided with oblique fold lines (d) each having a rectangular shape through the vertical fold lines (b, b).
The front plate (10) with the upper and lower sides (1,11) connected to the left and right sides, and the front plate (20) with the trapezoidal side front plates (22,22) with a slightly narrow upper part connected to the left and right sides. A slightly drum-shaped bottom plate (32) having bottom folded pieces (31, 31) with diagonal fold lines (d, d) connected to the left and right sides and a horizontal fold line (e) in the center. ), A rear plate (40) with a trapezoidal side rear plate (42, 42) whose upper part (the lower part in FIG. 3) is slightly narrower on the left and right sides, and an oblique fold line (d) are provided. The upper back plate (50) in which upper folded pieces (51, 51) are continuously provided on the left and right sides is combined with a horizontal fold line (g) and a horizontal fold line having two bent portions (i, i) ( f, f) and the horizontal fold line (g), the side heat-sealed pieces
(60, 60) and the upper heat-fused piece (61, 61) are connected via a vertical fold line (c, c) and a horizontal fold line (h, h), and the front plate (20 ), The bottom plate (32), and the upper portion (the lower portion in FIG. 6) of the rear plate (40), each passing through the bent portion (i, i) of the horizontal fold line (f, f). A liquid paper container blank made of a paper laminated material having at least an inner surface laminated with a heat-fusible resin layer provided with a vertical fold line (a, a) of 270 g having a 20 μm polyethylene layer laminated on the inner surface. / m ² , using the back white manila cardboard, performing normal printing on the outer surface side in the same manner as in Examples 1 and 2, and performing vertical, horizontal, and high This figure shows a state in which a blank of a liquid paper container for juice containing pulp having a size of about 5 cm, 6 cm, and 15 cm and a content of 360 ml is prepared.

FIG. 6 is a perspective view showing the liquid paper container of the third embodiment in a state where the contents are filled and the container is made. That is, similar to the first and second embodiments, FIG.
First, the horizontal fold line of the liquid paper container blank shown in
(e) is mountain-folded and the inner surfaces of the left and right side heat-sealed pieces (60, 60) are heat-sealed to each other in a plane, and each fold line (b, b, c, c,
d, d, d, d, f, f) are mountain-folded or valley-folded, and the blank of this liquid paper container is made into a rectangular parallelepiped box with an open upper surface, and left and right bottom folded pieces protruding in a triangular shape. After the (31, 31) is folded back and adhered to the bottom plate (32), the contents are filled, and the inner surfaces of the upper heat-fused pieces (61, 61) in the upper portion are heat-sealed flat to each other and sealed. Then, the remaining fold lines (d, d, d, d, g, g, h, h) are folded in a mountain or valley, and the upper front plate (10) and the upper rear plate (50) are made to be the same. It shows a state in which the box is made into a flat shape, the left and right upper folded pieces (11, 51, 11, 51) protruding in a triangular shape are folded back and adhered to the side plates (22, 42, 22, 42). is there.

In the liquid paper container of the present embodiment, similarly to the first and second embodiments, the horizontal fold line (e) is firstly folded into a mountain to form the left and right side heat-sealed pieces (60, 60). The inner surfaces of the upper heat-fused pieces (61, 61) are heat-sealed in a plane by heat-sealing the inner surfaces of the upper heat-fused pieces (61, 61) by filling the juice containing the pulp as the contents by heat-sealing the inner surfaces. By sealing,
Since the heat-sealing is performed in a state where the end face of the paper-laminated material does not come into contact with the contents, and the heat-sealing of three or more paper-laminated materials is not performed. And a liquid paper container which can be box-formed from a single blank made of a paper laminate material and is less likely to leak liquid or the like.

Further, in the liquid paper container of the present embodiment, as shown in FIG. 3, a slightly drum-shaped bottom plate (32) is provided.
As in the case of the first and second embodiments, the front plate (20) is continuously connected via a horizontal fold line (f, f) having two bent portions (i, i).
Of the horizontal fold lines (f, f) over the lower part of the base plate (32) and the upper part (the lower part in FIG. 6) of the rear plate (40).
By providing two vertical fold lines (a, a) passing through (i, i), unlike the first and second embodiments, each has a trapezoidal side front plate having a slightly narrow upper portion. 22, 22) and the rear side plates (42, 42) are connected in series, and each fold line is folded in a mountain or valley to form a rectangular parallelepiped box. As shown in FIG. Along the vertical fold line (a, a) of the front panel (20) and the rear panel (4
(0) and a slightly swelled lower portion and a slightly concave bottom plate (32), and a slightly narrower upper rectangular liquid paper container were obtained, with respect to the weight of the contents. , Front panel (20)
A liquid paper container having a different shape from those of the first and second embodiments is obtained, in which the swelling of the lower part of the lower and the rear plate (40) is inconspicuous and the display effect is improved. .

[0022]

[Effects of the Invention] As described above, in the liquid paper container of the present invention, first, the horizontal fold line (e) is mountain-folded so that the inner surfaces of the left and right side heat-fused pieces (60, 60) are connected. By heat sealing in a flat shape, and after filling the contents,
Because the inner surfaces of the upper heat-fused pieces (61, 61) are heat-sealed in a flat shape and sealed, the heat-sealing is performed in a state where the end surface of the paper laminated material does not contact the contents. In order not to heat-bond three or more paper laminated materials,
It is possible to provide a liquid paper container which is completely flat and heat-sealed, can be box-formed from one blank made of a paper laminated material, and is less likely to leak liquid.

In the liquid paper container of the present invention,
As shown in the embodiment, a slightly drum-shaped bottom plate (30) or a slightly drum-shaped bottom plate (32) is formed by a horizontal fold line (f, f) having two bent portions (i, i). Through the lower part of the front plate (20), the bottom plate (32), and the upper part of the rear plate (40), and the bent portions (i, b) of the horizontal fold lines (f, f) respectively. i), two vertical fold lines (a, a) are provided, and each of the fold lines is mountain-folded or valley-folded to form a rectangular parallelepiped box. , a), the front panel (20) and the rear panel (4
(0) and the lower part is slightly concave or swollen and the bottom plate (30 or 3)
A liquid paper container having a rectangular parallelepiped shape, in which 2) is slightly bulged or depressed, is obtained by bulging the lower part of the front plate (20) and the rear plate (40) with respect to the weight of the contents. The present invention can provide a liquid paper container which is prevented from appearing or is less noticeable, and which is also preferable in appearance.

Further, the liquid paper container of the present invention is a liquid paper container which can be boxed from one blank made of paper laminated material, wherein the end face of the paper laminated material does not come into contact with the contents (seepage on the end face). (No need to prevent heat-sealing) and heat-sealing the inner surfaces of the paper laminate material (no heat-fusible resin layer on the outer surface)
Thus, it is possible to provide a liquid paper container made of a paper laminated material, which is easy to treat and dispose at the time of disposal and is inexpensive to manufacture.

[Brief description of the drawings]

FIG. 1 is a plan view of a liquid paper container blank according to a first embodiment of the present invention.

FIG. 2 shows a second embodiment of the present invention, in which a slightly drum-shaped bottom plate (32) is continuously provided instead of the slightly drum-shaped bottom plate (30) of the liquid paper container blank shown in FIG. It is a top view of the blank of the liquid paper container which was made.

FIG. 3 shows a third embodiment of the present invention, in which the blanks of the liquid paper container shown in FIGS. 1 and 2 are replaced with rectangular side front plates (21, 21) and rear side plates (41, 41), respectively. The upper and lower sides of the trapezoidal side plates (22, 22) and the rear plate (4
2, 42) is a plan view of a blank of the liquid paper container provided in series.

FIG. 4 is a perspective view of the liquid paper container according to the first embodiment, showing a state in which contents are filled and the container is made;

FIG. 5 is a perspective view showing a state in which a liquid paper container of Example 2 is filled with contents and made into a box.

FIG. 6 is a perspective view of a liquid paper container according to a third embodiment, showing a state where contents are filled and a box is made;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Top front plate 11, 51 ... Top folded piece 20 ... Front plate 21, 22 ... Side front plate 30, 32 ... Bottom plate (30) 31 ... Bottom folded piece 40 ... Rear plate 41, 42 ... Side rear plate 50 ... Upper rear plate 60… side heat fusion piece 61… upper heat fusion piece a, b, c… vertical fold line d… diagonal fold line e, f, g, h… horizontal fold line i… horizontal fold Bent part of line (f)

────────────────────────────────────────────────── ─── Continuing from the front page (72) Noriko Kobayashi 1-5-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (72) Toshiya Naito 5-1-1 Taito, Taito-ku, Tokyo Toppan Printing Inside (72) Inventor Makoto Igarashi 1-1-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (72) Inventor Kira Shirasugi 5-1-1 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. Examiner Motohito Ito (56) Reference: Japanese Utility Model Application No. Sho 60-32221 (JP, U) Japanese Utility Model Application No. 56-24614 (JP, U) Japanese Utility Model Application No. 57-2876 (JP, U) Japanese Utility Model Application No. 6-1219 JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B65D 5/40, 5/42, 5/60

Claims (3)

(57) [Scope of request for utility model registration] 1. Upper folded pieces (11, 11) each having a rectangular, oblique fold line (d) provided through a vertical fold line (b, b).
Front side plate (10) and side front plates (21, 21)
With the front plate (20) connected to the left and right sides, and the oblique fold line (d,
Slightly drum-shaped bottom plate (30) with bottom folded pieces (31, 31) provided with d) connected to the left and right sides and a horizontal fold line (e) provided in the center
And a rear plate (40) with side rear plates (41, 41) connected to the left and right sides
And an upper rear plate (50) having upper folded pieces (51, 51) provided with diagonal fold lines (d) connected to the left and right sides, and a horizontal fold line (g) and two bent portions ( i, i) of the blank sequentially connected via a horizontal fold line (f, f) and a horizontal fold line (g) having left and right,
On all the upper and lower sides, the side heat fusion pieces (60, 60) and the upper heat fusion pieces (6
1,61) via the vertical fold line (c, c) and the horizontal fold line (h, h), and the lower part of the front plate (20), the bottom plate (30) and the rear plate Over the upper part of (40), each horizontal fold line (f, f)
A liquid paper container blank made of a paper laminated material having at least an inner surface laminated with a heat-fusible resin layer, provided with two vertical fold lines (a, a) passing through the bent portions (i, i) of FIG. First, the horizontal fold line (e) of this liquid paper container blank
And heat-sealing the inner surfaces of the left and right side heat-fused pieces (60, 60) in a planar shape, and fold lines (b, b, c, c, d,
d, d, d, f, f) are mountain-folded or trough-folded, and the blank of this liquid paper container is made into a rectangular parallelepiped box having an open upper surface, and left and right bottom folded pieces (31 , 31) is folded back and adhered to the bottom plate (30), and then the contents are filled, and the inner surfaces of the upper heat-fused pieces (61, 61) in the upper portion are heat-sealed flat and sealed. Then, the remaining fold lines (d, d, d, d, g, g, h, h) are folded in a mountain or valley, and the upper front plate (10) and the upper rear plate (50) are in the same plane. A liquid paper container characterized in that left and right upper folded pieces (11, 51, 11, 51) protruding in a triangular shape are folded back and adhered to side plates (21, 41, 21, 41). . 2. In place of said slightly drum-shaped bottom plate (30),
The liquid paper container according to claim 1, characterized in that a slightly drum-shaped bottom plate (32) is continuously provided. 3. The front side plates (21, 2) each having a rectangular shape.
Instead of 1) and rear side plates (41, 41), trapezoidal side front plates (22, 22) and rear side plates (42, 42), each of which has a slightly narrow upper part, were connected in series. The liquid paper container according to claim 1 or 2, wherein: