JPH0443468Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a paper container for liquids, more specifically, a paper container for liquids, more specifically, it is made of cardboard that has been treated with water resistance, and the main body of the container is long and upright in the vertical direction. This invention relates to the improvement of a rectangular paper container for liquid filling (hereinafter sometimes referred to as a rectangular paper container).

(Prior art and its problems) The cardboard used to form a rectangular paper container is either one whose front and back sides are water-resistant with a polyethylene thin layer, or a polyethylene thin layer is applied to the outside surface of the cardboard when it is made into a container. A cardboard is known in which the surface that will come into contact with the inside when used as a container is waterproofed with a laminate consisting of a polyethylene thin layer, an aluminum foil, and a polyethylene thin layer in this order.

Rectangular paper containers have a shape that is rectangular and has a sloped part on the top of the main body of the container [This type of container has a roof-shaped slope at the top and is used for containers such as milk or juice containers. (see Figure 1), or the shape of a rectangular parallelepiped with one side of the top shaved off to form a slope, and is often used for sake, etc.] Alternatively, a rectangular parallelepiped with a flat upper part (see FIG. 2) is known.

In order to pour out the contents of the above-mentioned upper roof type rectangular paper container, the upper roof type part is pushed out and the sandwiched part is pushed out with the pressure of the fingertips to form a spout. Measures are being taken. However, this type of container has the following problems.

(b) The means of opening the package and forming the spout is complicated, and the operation of applying pressure by pinching between fingers, especially in the process of forming the final spout, requires a certain degree of skill and is difficult for young children and children to perform. Difficult for old people.

(b) When forming the spout, the inner surface of the spout is a part that was glued before opening, so it becomes fluffy and swells when it comes into contact with the liquid inside, which is undesirable from a sanitary standpoint.

In addition, in the case of a rectangular paper container of the upper slope type in which one side of the upper part of the rectangular body is shaved off so as to form a slope, a hole is drilled in the slope and the hole is A cylindrical spout with a lid is attached and fixed, and the contents are poured out from the spout. However, with this container, it is necessary to incorporate the process of attaching the spout into the container production process, which reduces productivity and requires manufacturing the spout separately, increasing production costs. There is a growing problem.

In a rectangular paper container with a flat top, as shown in FIG. 2, the folded part to make the top flat is pulled back when opening.
A corner of the protrusion created by pulling back is cut off with scissors to create a spout for the contents.

Even in this container, it takes a lot of effort to make the spout, and it is difficult for young children to operate it.

(Means for Solving the Problems) The present invention solves the above-mentioned conventional problems by providing a rectangular paper container that can easily form a liquid outlet from which the contents can be easily poured out. It was extremely successful.

Hereinafter, the paper container of the present invention will be explained with reference to the accompanying drawings, but the present invention is not limited to the examples described below unless it deviates from the gist thereof.

FIG. 1 is a schematic perspective view of the main parts of an example of the container of the present invention;
FIG. 2 is a schematic perspective view of the main parts of another example of the container of the present invention;
FIG. 3 is an explanatory diagram showing a cross section taken along the - line in FIG. 1, FIG. 4 is a schematic cross-sectional diagram taken along the -- line in FIG. 1, and FIG. A schematic cross-sectional diagram of the state when it is peeled off,
FIGS. 6 and 7 are explanatory diagrams illustrating the cross-sectional structure of water-resistant cardboard that constitutes the paper container of the present invention, and FIG. 8 is an explanatory diagram showing an example of the shape of the liquid outlet in the paper container of the present invention. It is.

Although only the upper portion of the container is shown in FIGS. 1 and 2, the lower portion thereof may have the same shape and structure as a conventional rectangular paper container.

In the figure, 1 is a rectangular container main body of the container of the present invention, 2 is the upper surface of the container main body 1, 3 is a cardboard core layer of water-resistant cardboard that constitutes the container of the present invention, 4
and 5 is a polyethylene thin layer forming the outermost layer on both sides of the waterproof cardboard that constitutes the container of the present invention, 6 is a polyethylene thin layer that is also a waterproof cardboard, and 7 is also a waterproof cardboard. Aluminum foil, 8 is a liquid outlet, 9 is a sealing sheet that liquid-tightly seals the liquid outlet, 10 is a polyethylene film constituting the sealing sheet, 11 is also an aluminum foil, 12 is a polyethylene film, and 13 is a protective film. It is. 14 is a missing part in the aluminum foil 11; 15 is a knob piece used when peeling the sealing sheet 9; 16 is a strong adhesive part that firmly adheres one end of the sealing sheet 9 to the top surface 2 of the container; 17 is a portion for peeling off the sealing sheet 9. At this time, the fragment 18 torn from the layer of polyethylene film 10 is a bent portion at the boundary between the container body portion 1 and the top surface 2.

The water-resistant cardboard forming the container of the present invention has a cardboard core layer waterproofed on both sides, and the outermost layer is laminated with a thin polyethylene layer. Specifically, for example, as shown in FIG.
It may consist of three layers, with polyethylene thin layers 4 and 5 laminated on both sides, respectively, or as shown in FIG. It may be made up of five layers in which a polyethylene thin layer 6 and an aluminum foil 7 are interposed between the cardboard core layer 3 and the polyethylene thin layer 5 to further improve gas barrier properties. The cardboard shown in Figure 7 is used with a thin polyethylene layer 5 on the inside when forming the container. In FIGS. 3 to 5, an example of a container using cardboard with a three-layer structure shown in FIG. 6 will be explained.

In the container of the present invention, a liquid outlet 8 for pouring out the contents is provided on the upper surface 2, and in order to seal the liquid outlet 8, a sealing sheet 9 covers the opening and covers the upper surface of the container. It is glued to 2.

As shown in FIGS. 3 and 4, this sealing sheet 9 is made of a laminate in which a polyethylene film 10, an aluminum foil 11, a polyethylene film 12, and a protective film 13 are laminated in this order. 10 faces are bonded in contact with the top surface 2 of the container. The protective film 13 is for protecting the sealing sheet 9, and specifically, for example, aluminum foil, paper, polyester film, etc. are used alone or in combination of two or more. This protective film 13 may be coated with another thin layer, if necessary.

Aluminum foil 11 constituting sealing sheet 9
As shown in FIGS. 3 and 4, a missing portion 14 is formed at a location corresponding to the opening of the liquid outlet 8. That is, when viewed two-dimensionally,
The aluminum foil 11 is shaped like the frame of a picture frame, and the inner edge of the frame is aligned with the opening edge of the liquid outlet 8 or is slightly inside the opening edge (i.e., as shown in FIGS. 3 to 3). (as in the example shown in Figure 5)
It is better to do so.

The aluminum foil 11 is sandwiched between the polyethylene film 10 and the polyethylene film 12 and laminated and bonded. In the sealing sheet 9 used in the present invention, the aluminum foil 11 and the polyethylene film 10 (A in FIG. 3) are sandwiched between the polyethylene film 10 and the polyethylene film 12 and laminated and bonded.
3) is A and the adhesive strength between the aluminum foil 11 and the polyethylene film 12 (the portion indicated by B in FIG. 3) is B, so that the relationship A>B holds.

For example, the following procedure can be used to provide the adhesive strength relationship of A>B. Since polyethylene film and aluminum foil are different in nature, it is difficult to form a strong bond with them, but fine irregularities can be formed on the surface of aluminum foil by mechanical polishing or chemical corrosion treatment, or By subjecting the surface of the foil to corona discharge treatment, the adhesive strength can be increased compared to those not subjected to these treatments. By such means, the above relationship A>B can be achieved.

One end of the liquid outlet 8 is preferably provided at a position close to the bent portion 18 at the boundary between the container body portion 1 and the upper surface 2, as shown in FIGS. 1 and 2. The sealing sheet 9 is provided with a grip piece 15 at the end near the bent portion 18 to be held between the fingertips when peeling off the sealing sheet 9. As shown in FIG. 4, this tab piece 15 extends outward from the layers constituting the sealing sheet 9, excluding the aluminum foil 11, the polyethylene film 10, the polyethylene film 12, and the protective film 13. However, it is preferable to use a laminate of these three layers.

Knob piece 1 of sealing sheet 9 having the above configuration
5 between the fingertips and pulling the sealing sheet 9 in the direction of peeling, the polyethylene film 10 of the sealing sheet 9 and the thin polyethylene layer 4 on the top surface of the container are bonded together (this bonding is done by heat fusion). Therefore, the polyethylene film 10 is not easily peeled off, and instead, the polyethylene film 10 is torn at the edge of the aluminum foil 11 along the edge line. Then, when a force is further applied to the sealing sheet 9 in the peeling direction, the adhesive strength A between the aluminum foil 11 and the polyethylene film 10 increases, as described above, Since the adhesive strength is greater than B, peeling occurs between the aluminum foil 11 and the polyethylene film 12, leaving the aluminum foil 11 on the container side, as shown in FIG. Blocking sheet 9
As the peeling progresses, the missing portion 1 of the aluminum foil 11
At point 4, as shown in FIGS. 3 and 4, the polyethylene film 10 and the polyethylene film 12 are directly bonded to each other (the bonding here is by heat fusion). Since it is adhesive, the adhesive strength can be increased, and the two are not easily peeled off, and the polyethylene film 12 tears off the polyethylene film 10 to which it is adhered. In this way, the polyethylene film 12 continues to stick to the torn part of the polyethylene film 10 (the part indicated by the reference numeral 17 in FIG. 5), and the sealing sheet 9 is peeled off, and the liquid outlet 8 is opened to the outside. It will be open to the public. When the sealing sheet 9 is peeled off near the inner edge of the aluminum foil 11 in this way, the polyethylene film 10 reaches the point where it is adhered to the thin polyethylene layer 4 on the top surface of the container, and the adhesion here is also due to the bond between the polyethylene films. Because it is adhesive, it is strong, and as shown in Figure 5, aluminum foil 1
Peeling occurs between 1 and the polyethylene film 12. The strong adhesive part 16 at the end of the sealing sheet 9 has a structure in which the layer of aluminum foil 11 is excluded from the constituent layers of the sealing sheet 9,
The polyethylene film 12 and the polyethylene film 10 are directly bonded, and this is bonded to the polyethylene thin layer 4 on the outermost surface of the container, and the mutual bonding strength is increased due to bonding between polyethylenes of the same quality, so that sealing is not possible. When the peeling of the sheet 9 reaches this point, it becomes difficult to proceed further. Thereafter, the strong adhesive portion 16 will serve as a hinge for opening and closing the sealing sheet.

In the above manner, the sealing sheet 9 is peeled off,
A liquid outlet 8 appears, allowing the contents to be poured out.

As shown in FIG. 8, the shape of the liquid outlet 8 may be, for example, a U-shape (FIG. 8a), a V-shape (FIG. 8b), or a U-shape with a step in the middle (FIG. 8c). Preferably, the polyethylene film 10 constituting the sealing sheet 9 is made to have a shape that becomes narrower toward the bottom so that the breakage of the polyethylene film 10 constituting the sealing sheet 9 starts from the narrowed end, since the peeling of the sealing sheet 9 becomes easier. .

The present invention has been described above for a rectangular paper container with an upper roof as shown in FIG. The present invention can be similarly applied to a rectangular paper container with a rectangular top slope or a paper container with a flat top surface as shown in FIG.

(Effects of the invention) (a) In the container of the present invention, the contents can be poured out by simply pinching and pulling the tab of the sealing seal that seals the liquid outlet between the fingertips. This is a paper container whose outer surface is treated with a thin layer of polyethylene, and a sealing sheet made by skillfully combining and laminating aluminum foil and polyethylene film to ensure strong adhesion between the polyethylene films. This was achieved by taking advantage of the fact that the adhesion between polyethylene and aluminum foil is relatively weak. Thus, compared to conventional rectangular paper containers with a top roof type or paper containers with a flat top surface, the paper container of the present invention is simple and requires no skill, and even a small child can easily make a spout.

(b) It is better in terms of hygiene than the conventional rectangular paper container with a top roof.

(c) The manufacturing cost is lower than the conventional rectangular parallelepiped paper container with a lid attached to the slope.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of the main parts of an example of the container of the present invention;
FIG. 2 is a schematic perspective view of the main parts of another example of the container of the present invention;
3 is an explanatory diagram showing a cross section along the - line in FIG. 1, FIG. 4 is an explanatory diagram showing a cross section along the - line in FIG. 1, and FIG. An explanatory diagram showing a cross section when the sealing sheet is peeled off, FIGS. 6 and 7 are explanatory diagrams illustrating the cross-sectional structure of the waterproofed cardboard that constitutes the paper container of the present invention, and FIG. It is an explanatory view showing an example of the shape of the liquid outlet in the devised paper container. In the figure, 1 is the container body, 2 is the upper surface of the container body, 3 is a cardboard core layer, 4 and 5 are polyethylene thin layers, 8 is a liquid outlet, 9 is a sealing sheet, 10 and 12 are polyethylene films, 11 is aluminum foil, 13 is a protective film, 14 is aluminum foil 11
The missing portion 15 is a tab piece, and 16 is a strong adhesive portion provided at the end of the sealing sheet 9.

Claims (1)

[Claims for Utility Model Registration] (a) A container made of water-resistant cardboard with polyethylene thin layers 4 and 5 laminated on the outermost layers on both sides and a cardboard core layer 3 inside, and whose main body is vertically long. In a rectangular container, (b) A liquid outlet 8 is provided on the top surface 2 of the container body.
is provided, and this liquid outlet 8 is connected to a sealing sheet 9
(c) The sealing sheet 9 is made of a laminate in which a polyethylene film 10, an aluminum foil 11, a polyethylene film 12, and a protective film 13 are laminated in this order, and the sealing sheet 9 is (d) Aluminum foil 1 in the sealing sheet 9 is bonded with the side 10 in contact with the upper surface 2 of the container to seal the liquid outlet 8;
1 has a cutout portion 14 formed at a location corresponding to the opening of the liquid outlet 8, and the sealing sheet 9 has a polyethylene film 10 and a polyethylene film 12 adhered to each other in the cutout portion 14. ) When the adhesive strength between the polyethylene film 10 and the aluminum foil 11 in the sealing sheet 9 is A, and the adhesive strength between the aluminum foil 11 and the polyethylene film 12 is B,
The adhesive strength of A is greater than that of B, and (f) the sealing sheet 9 has layers of polyethylene film 10, polyethylene film 12, and protective film 13, which constitute the sealing sheet 9, on the edge thereof. Forming a tab piece 15 extending outward and laminating, (g) the tab piece 15 in the sealing sheet 9;
At the end opposite to the installed end, a polyethylene film 10 constituting the sealing sheet 9,
This liquid paper container is made by firmly adhering a strong adhesive part 16 formed by extending and laminating layers of a polyethylene film 12 and a protective film 13 to the upper surface 2 of the container.