JP6953782B2 - Liquid paper container - Google Patents

Description

The present invention relates to a liquid paper container, and in particular, it is provided with a spout for pouring out the contents and a dispenser pump so that the contents can be dispensed into a small amount and used. Regarding liquid paper containers that can be used for a period of time.

Conventionally, as a container for shampoo and conditioner, a plastic bottle container having a certain degree of rigidity has been generally used. This is because these containers are often left in a water-wet environment such as in the bathroom for a long period of time. Since these containers are costly, it is often the case that a product containing a pouch for refilling is separately prepared and only the contents are refilled when the contents are exhausted.

In order to save the trouble of refilling and reduce the cost of the container, it has been proposed to use a paper container instead of a plastic bottle. The paper container with a dispenser described in Patent Document 1 is a paper container provided with a dispenser mounting portion on which the dispenser is mounted on the container body and a support portion for supporting the dispenser mounting portion.

Further, in the liquid paper container for pumping described in Patent Document 2, a general Goebel top type paper container is turned upside down, the pump is attached to a flat top surface, and a bottom stabilizing member is attached to the bottom of the gable roof. Is fitted to give it independence.

Jikkenhei 5-65862 Japanese Unexamined Patent Publication No. 10-147335

In the paper container with a dispenser described in Patent Document 1, since the end face of the folded paper is exposed on the bottom surface during molding, water penetrates from the end face of the paper when it is wet with water for a long period of time, and the container There is a problem that the paper becomes vulnerable and the paper grows.

In the liquid paper container for pumping described in Patent Document 2, this problem can be avoided to some extent by using a water-resistant material for the bottom stabilizer used for the bottom surface, but the cost required for the bottom stabilizer is not included. Therefore, in terms of total cost, it has to be halfway.

An object to be solved by the present invention is to propose a liquid paper container in which water does not permeate from the end surface of paper even when it is placed in an environment where it gets wet with water without using a special member.

As a means for solving the above problems, the invention according to claim 1 is a liquid paper container obtained by molding a laminate in which a water-resistant synthetic resin film is bonded to the front surface and the back surface of the paper. A liquid paper having a spout on the top surface, no end face of the paper within a height of 3 mm from the bottom surface, and the end face of the paper having a portion inclined with respect to the bottom surface. It is a container.

The liquid paper container according to the present invention has a water-resistant layer on the front and back surfaces of the paper, and the end face of the paper does not exist within a height of 3 mm from the bottom surface. Water does not seep from the front and back surfaces and end faces of the paper. Further, since the end face of the paper has a portion inclined with respect to the bottom surface, even if water is splashed from the upper part of the container, the water reaching the end face of the paper flows and stays along the inclined end face. There is no need to worry about the end face of the paper being exposed to water for a long time.

The invention according to claim 2 is the liquid paper container according to claim 1, wherein the end face of the paper is inclined with respect to the bottom surface in all portions.

The invention according to claim 3 is the liquid paper container according to claim 1, wherein the shape of the container is a rectangular parallelepiped shape.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the spout is a pump that dispenses a certain amount of liquid by pressing from above. Liquid paper container.

The invention according to claim 5 is the liquid paper container according to any one of claims 1 to 4, wherein the laminate includes a barrier layer for preventing the permeation of water vapor and oxygen. be.

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

Further, since the end face of the paper has a portion inclined with respect to the bottom surface, even if water is splashed from the upper part of the container, the water reaching the end face of the paper flows and stays along the inclined end face. There is no need to worry about the end face of the paper being exposed to water for a long time.

The liquid paper container according to the present invention is excellent in terms of cost because it does not use any special member other than the spout. Therefore, it can be thrown away when the contents are exhausted, and the trouble of refilling can be saved. In addition, it has all the advantages of a paper container, such as being able to be recycled or discarded as a paper container at the end of use.

As described in claim 2, when the end face of the paper is inclined with respect to the bottom surface in all parts, the retention of water on the end face of the paper is minimized, and the drainage is excellent. Become.

As described in claim 3, when the shape of the container is a rectangular parallelepiped shape, the container itself can be easily molded, and there is an effect that it does not take up a place for storage when used.

As described in claim 4, when a pump is provided as a spout, it can be used for many purposes used in the bathroom such as shampoo, conditioner, and body soap.

As described in claim 5, when the laminate includes a barrier layer that prevents the permeation of water vapor and oxygen, long-term storage stability and durability at the product stage or the use stage are improved.

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

Hereinafter, the liquid paper container according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective explanatory view showing an embodiment of the liquid paper container 1 according to the present invention. Further, FIG. 5 is a schematic cross-sectional view showing an example of the layer structure of the laminate 10 used in the liquid paper container according to the present invention. Further, FIG. 3 is a schematic plan view showing a blank 20 of the liquid paper container shown in FIG.

The liquid paper container 1 according to the present invention is a liquid paper container formed by molding a laminate 10 in which water-resistant synthetic resin films 11 and 14 are bonded to the front surface and the back surface of the paper layer 12, and is formed on the top surface 21. It is characterized in that it has a spout 6, the end surface 8 of the paper does not exist in a range within 3 mm in height from the bottom surface 3, and the end surface of the paper has a portion inclined with respect to the bottom surface. In FIG. 1, the end face 8 of the inclined paper is represented by a double line.

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 end surface 8 of the paper on the side surface is 25 mm. According to the experiment, if the end face of the paper is not within a height of 3 mm from the bottom surface, water does not permeate from the end face of the paper even if the paper container is left in a wet place. It turned out to be.

Ideally, the distance from the bottom surface to the edge surface of the paper should be 5 mm or more to obtain better results.

In the example shown in FIG. 1, the end faces of all the papers are inclined with respect to the bottom surface, and the angle (α) with respect to the bottom surface is about 3 °.

The shape of the paper container is not limited to the rectangular parallelepiped shape as in this example, but may be arbitrary such as a cube shape or a square pillar shape.

In the example shown in FIG. 1, the injection port 6 provided on the top surface 2 is a fixed-quantity discharge pump, and a fixed amount of contents can be injected by pushing the upper part once. The spout 6 is not limited to such a pump, and can be arbitrarily selected from a general internal spout, an external spout, a spray spout, and the like. Further, in the case of a pump, a flange with a screw is attached to the paper container side, and the pump is attached and made removable so that only the pump can be used repeatedly.

As the laminate 10 used for the paper container, it is essential that at least the front surface synthetic resin film 11 and the back surface synthetic resin film 16 are provided 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 surface synthetic resin film 16, a polyolefin resin layer 13 for adhering the paper layer and the barrier layer, and the barrier layer 14 and the back surface synthetic resin film. An adhesive layer 15 for adhering the 16 is provided. Further, printing with ink 17 is performed 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. The paper basis weight ^{200g / m 2 ~500g / m 2} , about a density 0.6g ^/ cm ³ ~1.1g ^/ cm 3 are suitable.
As the surface synthetic resin film, low density polyethylene resin (LDPE) and linear low density polyethylene resin (LLDPE) are preferable. It can be extruded and laminated on the surface of the paper layer 12. It is advisable to apply corona treatment to the extruded surface in order to improve the adhesion of the ink during printing.

When the barrier layer 14 is used, volatilization of the contents is prevented, and the storage stability and durability as a paper container are improved. As the barrier layer 14, a polyethylene terephthalate film (PET) in which alumina, silica, aluminum or the like is vapor-deposited is preferably used in addition to the aluminum foil. The thickness of the thin-film deposition layer is preferably 5 nm to 100 nm, and the thickness of the PET film is preferably about 6 to 25 μm. When an 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 for adhering 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 methacrylate copolymer resin. (EMAA), ethylene acrylic acid copolymer resin (EAA), ionomer, polypropylene resin (PP) and the like can be used.

The thickness of the adhesive resin layer 13 is preferably 10 μm to 60 μm. If it is less than 10 μm, sufficient strength is generally not obtained. Corona treatment, ozone treatment, and anchor coating treatment may be performed on the paper surface or film surface to be bonded in order to improve the adhesive strength.

The back surface synthetic resin film 16 is a layer generally called a sealant layer, and HDPE, LDPE, MDPE, and LLDPE can be used, but 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 containing some polybutene. The thickness of the back surface synthetic resin film 16 is appropriately 30 μm to 100 μm, and the film is formed by the T-die method or the inflation method.

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

The thermoplastic resin film on the front and back surfaces is not limited to a single layer and may be composed of a plurality of layers, but the material on the outermost surface is such that it can be heated and welded when molding a paper container. It is desirable that the material on the back surface is the same as or similar to the material on the back surface.

A method of molding a paper container will be described with reference to FIG. FIG. 3 shows a state in which the blank of the liquid paper container shown in FIG. 1 is viewed from the front surface side (outer surface side). The dotted line in the figure shows the mountain fold ruled line, and the alternate long and short dash line shows the valley fold ruled line.

Explaining the blank shown in FIG. 3, a side plate 22, a bottom plate 24, a side plate 23, and a glue allowance 41 are continuously provided from a top plate 21 having a spout mounting hole 7 via a mountain fold ruled line. Side rectangular plates 37 and 38 are connected to the left and right sides of the front plate 21 via mountain fold ruled lines, and side rectangular plates 39 and 40 are connected to the left and right sides of the bottom plate 24 via mountain fold ruled lines.

On the side plates 22 and 23, side triangular plates 25, 26, 27, and 28 are connected to the left and right via a valley fold ruled line, respectively. Side folding plates 29 to 36 are continuously provided on each side of the side triangular plates 25 to 28 that do not come into contact with the side plates via mountain fold ruled lines.

The side folding plates 31 and 33 and the side rectangular plate 39 are connected with a side glue margin 42 via a valley fold ruled line, and the side folding plates 32 and 34 and the side rectangular plate 40 have a side glue margin 43. It is connected continuously via a valley fold ruled line.

In order to mold the paper container shown in FIG. 1 from the blank shown in FIG. 3, first, all the ruled lines in the vertical direction are folded in a mountain shape, and the glue margin 41 is placed on the back surface plate 21 and the back surfaces of the side rectangular plates 37 and 38. Heat seal and make it square columnar. Next, the side glue margin 42 portion is put into the palm of the side rectangular plate 37 and the side folding plates 29 and 35 facing each other and heat-sealed. The side triangular plates 25 and 27 are folded and heat-sealed so that all the ruled lines on the outer circumference are mountain-folded, and the folded side surface 5 is formed. Next, the side glue margin 43 on the opposite side is also molded in the same manner to form the folded side surface 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 formed from the blank shown in FIG. Also in FIG. 2, the end face of the paper is indicated by a double line. In the paper container shown in FIG. 2, most of the end face of the paper is inclined with respect to the bottom surface, but includes a part 9 which is horizontal. Further, the direction of inclination of the end face of the paper is opposite to that of the example shown in FIG. The angle of inclination (α) is 5 °.

As described above, when leaving a horizontal portion on the end face of the paper, the length of the horizontal portion is preferably 15 mm or less.

The folding structure of the liquid paper container according to the present invention is not particularly limited. For example, the example shown in FIG. 6 is the liquid paper container shown in FIG. 1 in the direction of the folding side surface 5. The folded side folding plates 29 and 30 are folded to the side 4 side. In the example shown in FIG. 6, a side plate 22 having no exposed end faces or folds can be obtained.

1 ... Liquid paper container 2 ... Top surface 3 ... Bottom surface 4 ... Side surface 5 ... Folded side surface 6 ... End face 9 ... Horizontal portion of the end face of the paper α ... Angle with respect to the bottom surface 10 ... Laminated body 11 ... Surface synthetic resin film 12 ... Paper layer 13 ... Adhesive resin layer 14 ... Barrier layer 15 ... Adhesive layer 16 ... Backside 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 ... Glue allowance 42, 43 ... Side glue allowance

Claims (5)

A liquid paper container made by molding a laminate with a water-resistant synthetic resin film bonded to the front and back surfaces of the paper. It has a spout on the top surface and is within a height of 3 mm from the bottom surface. A liquid paper container characterized in that there is no end face and the end face of the paper has a portion inclined with respect to the bottom surface. The liquid paper container according to claim 1, wherein the end face of the paper is inclined with respect to the bottom surface in all parts. The liquid paper container according to claim 1 or 2, wherein the shape of the container is a rectangular parallelepiped shape. The liquid paper container according to any one of claims 1 to 3, wherein the spout is a pump that dispenses a certain amount of liquid by pressing from above. The liquid paper container according to any one of claims 1 to 4, wherein the laminate includes a barrier layer that prevents the permeation of water vapor and oxygen.

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