JP7135273B2 - liquid carton - Google Patents

Description

TECHNICAL FIELD The present invention relates to a paper container for liquid, and in particular, it is provided with a spout for pouring out the contents and a dispenser pump, so that the contents can be poured out little by little and used for a long time even in a wet place such as a bathroom. It relates to paper containers for liquids that can be used for a period of time.

Conventionally, as a container for shampoo, conditioner, etc., a plastic bottle container having a certain degree of rigidity was generally used. This is because these containers are often placed in wet environments such as bathrooms for long periods of time. Since these containers are costly, it is often the case that a product containing a refill pouch is prepared separately, and when the contents are used up, only the contents are refilled and used.

In order to save the trouble of refilling and reduce the cost of containers, proposals have been made to use paper containers instead of plastic bottles. A paper container with a dispenser described in Patent Document 1 is a paper container provided with a dispenser mounting portion to which a dispenser is attached to a container body, and a support portion that suspends the dispenser mounting portion.

In addition, the paper container for pumping out liquid described in Patent Document 2 is a paper container of general gobel top type that is turned upside down, a pump is attached to the flat top surface, and a bottom stabilizing member is attached to the gable roof-shaped bottom. is inserted to give it independence.

Japanese Utility Model Laid-Open No. 5-65862 JP-A-10-147335

In the paper container with a dispenser described in Patent Document 1, the end face of the folded paper is exposed at the bottom during molding, so if it is wet with water for a long time, water will seep from the end face of the paper, and the container will be damaged. There is a problem that it becomes brittle and mold grows.

The liquid paper container for pumping described in Patent Document 2 can avoid this problem to some extent by using a water-resistant material for the bottom stabilizing member used on the bottom, but the cost required for the bottom stabilizing member is extra. For this reason, the total cost is inevitably half-finished.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper container for liquid that does not allow water to permeate through the edges of the paper even when placed in a wet environment without using a special member.

As a means for solving the above problems, the invention according to claim 1 is a liquid paper container formed by molding a laminate in which a water-resistant synthetic resin film is laminated on the front and back surfaces of paper,
The container has a rectangular parallelepiped shape with a top surface, four side surfaces, and a bottom surface,
Equipped with folded side surfaces fixed to two mutually opposing side surfaces of the container side surface,
The end surface of the paper is located at the lower end of the folded side surface substantially parallel to the bottom surface, and
The top surface has a spout, and the edge of the paper does not exist within a height range of 3 mm from the bottom surface,
The paper container for liquid is characterized in that the spout is a pump that dispenses a certain amount of liquid by pressing from above.

The paper container for liquid according to the present invention has a water-resistant layer on the front and back surfaces of the paper, and the edge of the paper does not exist within a height range of 3 mm from the bottom surface. Water does not seep through the front, back, or edges of the paper.

According to a second aspect of the present invention, there is provided the paper container for liquid according to the first aspect, which is formed by molding a single blank made of the laminate .

Further, the invention according to claim 3 is the liquid paper container according to any one of claims 1 or 2 , wherein the laminate includes a barrier layer that prevents permeation of water vapor and oxygen. be.

The paper container for liquid according to the present invention has a water-resistant layer on the front and back surfaces of the paper, and the edge of the paper does not exist within a height of 3 mm from the bottom, so it can be placed in a place where it gets wet with water. Even if it is wet, water will not seep through the front and back surfaces and the edges of the paper. Therefore, it can be used for applications such as those used in the bathroom.

The paper container for liquid according to the present invention does not use special members other than the spout, so it is excellent in terms of cost. For this reason, the container can be discarded when the content is used up, saving the trouble of refilling. In addition, it has all the advantages of a paper container, such as being able to be recycled or discarded as a paper container after use.

As described in claim 2, when the shape of the container is a rectangular parallelepiped, the container itself can be easily molded, and there is an effect that it does not take up much space when used.

As described in claim 3, when a pump is provided as an outlet, it can be used for many uses in the bathroom, such as shampoo, rinse, and body soap.

As described in claim 4, when the laminate contains a barrier layer that prevents the permeation of water vapor and oxygen, the long-term storage stability and durability in the product stage or use stage are improved.

FIG. 1 is a perspective explanatory view showing one embodiment of a paper container for liquid according to the present invention. FIG. 2 is a perspective explanatory view showing another embodiment of the paper container for liquid according to the present invention. FIG. 3 is a schematic plan view showing a blank of the paper container for liquid shown in FIG. FIG. 4 is a schematic plan view showing a blank of the paper container for liquid shown in FIG. FIG. 5 is a schematic cross-sectional view showing an example of the layer structure of the laminate used for the paper container for liquid according to the present invention. FIG. 6 is a perspective explanatory view showing another embodiment of the paper container for liquid according to the present invention. FIG. 7 is a perspective explanatory view showing another embodiment of the paper container for liquid according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION A paper container for liquid according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective explanatory view showing one embodiment of a liquid paper container 1 according to the present invention. Moreover, FIG. 5 is a schematic cross-sectional view showing an example of the layer structure of the laminate 10 used for the paper container for liquid according to the present invention. 3 is a schematic plan view showing the blank 20 of the paper container for liquid shown in FIG.

A paper container for liquid 1 according to the present invention is a paper container for liquid formed by molding a laminate 10 in which water-resistant synthetic resin films 11 and 14 are bonded to the front and back surfaces of a paper layer 12, and It has a spout 6 and is characterized in that the end face 8 of the paper does not exist within a height range of 3 mm from the bottom face 3. - 特許庁In FIG. 1, the edge face 8 of the paper is represented by double lines.

In the example shown in FIG. 1, the actual height from the bottom surface 3 to the top surface 2 is 85 mm, and the height from the bottom surface to the edge surface 8 of the paper on the side surface is 25 mm. According to experiments, if the edge of the paper does not exist within a range of 3 mm in height from the bottom, even if the paper container is left in a wet place, water will not permeate through the edge of the paper. I found out that I can.

As for the distance from the bottom surface to the edge of the paper, ideally, if the distance is 5 mm or more, even better results can be obtained.

The shape of the paper container is not limited to a rectangular parallelepiped shape as in this example, but may be a cubic shape, a quadrangular prism shape, or the like.

In the example shown in FIG. 1, the spout 6 provided on the top surface 2 is a metered discharge pump, and a certain amount of contents can be spouted by pushing the top once. The spout 6 is not limited to such a pump, and can be arbitrarily selected from general internal plugs, external plugs, spray plugs, and the like. In the case of a pump, a screwed flange is attached to the paper container side, and the pump can be attached and detached so that only the pump can be used repeatedly.

As the laminate 10 used for the paper container, it is essential to provide at least the surface synthetic resin film 11 and the back surface synthetic resin film 16 on the surface of the paper layer 12 . In the example shown in FIG. 5, a barrier layer 14 is further provided between the paper layer 12 and the back synthetic resin film 16, and a polyolefin resin layer 13 for bonding the paper layer and the barrier layer together, the barrier layer 14 and the back synthetic resin film. An adhesive layer 15 for adhering 16 is provided. Ink 17 is printed on the surface synthetic resin film 11 .

As the paper layer 12, thick paper such as milk carton base paper, card base paper, and various cardboards can be used. Suitable paper has a basis weight of 200 g/m ² to 500 g/m ² and a density of 0.6 g/cm ³ to 1.1 g/cm ³ .
Low-density polyethylene resin (LDPE) and linear low-density polyethylene resin (LLDPE) are preferable as the synthetic resin film on the surface. It can be extruded and laminated on the surface of the paper layer 12 . In order to improve the adhesion of ink during printing, it is preferable to apply corona treatment to the extruded surface.

When the barrier layer 14 is used, volatilization of the contents is prevented, and the storability and durability of the paper container are improved. As the barrier layer 14, besides aluminum foil, a polyethylene terephthalate film (PET) deposited with alumina, silica, aluminum, or the like is suitably used. The thickness of the deposited layer is preferably 5 nm to 100 nm, and the thickness of the PET film is preferably about 6 to 25 μm. If aluminum foil is used, the thickness is preferably about 5 to 15 μm.

In this example, the adhesive resin layer 13 is used as a method of bonding the paper layer 12 and the inner layer film including the barrier layer 14 . Materials used for this purpose include high-density polyethylene resin (HDPE), low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), linear low-density polyethylene resin (LLDPE), and ethylene methacrylic acid copolymer resin. (EMAA), ethylene acrylic acid copolymer resin (EAA), ionomer, polypropylene resin (PP), etc. can be used.

The thickness of the adhesive resin layer 13 is preferably 10 μm to 60 μm. If the thickness is less than 10 μm, generally sufficient strength cannot be obtained. In order to improve the adhesive strength, the surface of paper or film to be adhered may be subjected to corona treatment, ozone treatment, or anchor coating treatment.

The back synthetic resin film 16 is a layer generally called a sealant layer, and although HDPE, LDPE, MDPE, and LLDPE can be used, LLDPE is most preferable. In particular, those having a density of 0.925 or less and a melt index of 4 or more are preferable. There may be a layer that partially contains polybutene. A thickness of 30 μm to 100 μm is appropriate for the back synthetic resin film 16, and the film is formed by the T-die method or the inflation method.

The barrier layer 14 and the back synthetic resin film 16 may be laminated in advance to form an interior film. As a bonding method in this case, an adhesive for dry lamination or an adhesive for non-sol lamination is used. The amount of adhesive to be applied is 0.5 to 7.0 g/m ² . The barrier layer 14 and the back synthetic resin film 16 may be bonded together by extrusion using the above-described adhesive resin layer.

The thermoplastic resin film on the front and back surfaces is not limited to a single layer, and may be composed of multiple layers. It is desirable that the material of the bottom surface and the backmost surface be the same or similar.

A method of forming a paper container will be described with reference to FIG. FIG. 3 shows the blank of the paper container for liquid shown in FIG. 1 as seen from the surface side (outer surface side). In the drawing, dotted lines indicate mountain crease lines, and dashed lines indicate valley crease lines.

Referring to the blank shown in FIG. 3, a side plate 22, a bottom plate 24, a side plate 23, and an adhesive margin 41 are continuously provided from a top plate 21 having a spout mounting hole 7 via mountain crease lines. Rectangular side plates 37 and 38 are connected to the left and right of the front plate 21 via mountain crease lines, and rectangular side plates 39 and 40 are connected to the left and right of the bottom plate 24 via the crease lines.

Side triangular plates 25, 26 and 27, 28 are connected to the side plates 22, 23 on the left and right sides respectively via valley crease lines. Side folded plates 29 to 36 are connected to the sides of the side triangular plates 25 to 28 that are not in contact with the side plates through mountain crease lines.

The side folding plates 31, 33 and the side rectangular plate 39 are provided with side glue margins 42 connected to each other via valley crease lines, and the side folding plates 32, 34 and the side rectangular plate 40 are provided with side glue margins 43. They are connected via valley fold lines.

To form the paper container shown in FIG. 1 from the blank shown in FIG. It is heat-sealed and shaped into a square prism. Next, the side glue margin 42 is brought into contact with the opposing side rectangular plate 37 and the side folding plates 29 and 35 and heat-sealed. The side triangular plates 25 and 27 are folded so that the ruled lines on the outer peripheries are all mountain-folded and heat-sealed to form the folded side face 5.例文帳に追加Next, the side glue margin 43 on the opposite side is formed in the same manner to form the folded side face 5 .

FIG. 2 is a perspective explanatory view showing another embodiment of the liquid paper container 1 according to the present invention. The liquid paper container 1 shown in FIG. 2 is a paper container molded from the blank shown in FIG. Also in FIG. 2, the edge surface of the paper is indicated by double lines. The difference from the paper container shown in FIG. 1 is that the paste margin 41 is folded under the top plate 21 in the example of FIG. folded underneath.

FIG. 6 is a perspective explanatory view showing another embodiment of the paper container for liquid according to the present invention. In this example, the side folding plates 29 to 36 that have been folded into the folding side 5 of the paper container shown in FIG.

FIG. 7 is a perspective explanatory view showing another embodiment of the liquid paper container 1 according to the present invention. In this example, the arrangement of the top panel 21, the side panels 22 and 23, and the bottom panel 24 remains the same, but two sides of the side triangular panels 25 to 28 that are not in contact with the side panels are valley folds, and the side triangular panels 25 to 28 are rectangular. It is folded under the plates 37-40.

As described above, the container shape of the paper container for liquid according to the present invention is not particularly limited, and the object can be achieved as long as the end surface of the paper after molding has a height exceeding 3 mm from the bottom surface. can be done.

REFERENCE SIGNS LIST 1 Liquid paper container 2 Top surface 3 Bottom surface 4 Side surface 5 Folding side surface 6 Spout port 7 Spout mounting hole 8 End surface of paper Reference Signs List 10 Laminate 11 Front synthetic resin film 12 Paper layer 13 Adhesive resin layer 14 Barrier layer 15 Adhesive layer 16 Back synthetic resin film 17 Ink layer 20 Blank 21 Top plate 22, 23 Side plate 24 Bottom plate 25-28 Side triangular plate 29-36 Side folding plate 37-40 .. Side rectangular plate 41 .. Paste margins 42, 43 .. Side paste margins

Claims (3)

A liquid paper container formed by molding a laminate in which water-resistant synthetic resin films are laminated on the front and back sides of paper,
The container has a rectangular parallelepiped shape with a top surface, four side surfaces, and a bottom surface,
Equipped with folded side surfaces fixed to two mutually opposing side surfaces of the container side surface,
The end surface of the paper is located at the lower end of the folded side surface substantially parallel to the bottom surface, and
The top surface has a spout, and the edge of the paper does not exist within a height range of 3 mm from the bottom surface,
A paper container for liquid, wherein the pouring port is a pump for pouring out a certain amount of liquid by pressing from above. 2. The paper container for liquid according to claim 1, wherein the paper container for liquid is formed by molding a single blank made of the laminate. 3. The paper container for liquid according to claim 1, wherein the laminate includes a barrier layer that prevents permeation of water vapor and oxygen.

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