JP2018177327A - Paper container for liquid and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper container for liquid in which an upper surface is a flat and wide surface to which a pump dispenser can be easily attached, and a bottom surface has a local recess and an inclined surface inclined toward the recess to reduce the residual liquid.SOLUTION: A paper container for liquid which is formed using paper as a base material and in which both ends of a layered sheet with a sealant layer made of thermoplastic resin are fusion-bonded to at least an inner surface thereof and are formed into the cylindrical shape, and the cylindrical both ends are closed, has: a pump dispenser (2) on a discharging surface at an upper end of the paper container; a recess (131) in which a bottom surface plate (13) at a lower end thereof protrudes outwardly so as to be recessed inward; and an inclined surface (132) which is inclined to the recess, wherein a tip of a sucking tube of the pump dispenser is close to an inner surface of the recess of the bottom surface plate.SELECTED DRAWING: Figure 1

Description

  The present invention mainly stores food such as liquor, juice, lactic acid drink and non-food such as shampoo, body soap, household detergent, liquid fertilizer etc., and uses the pump dispenser provided at the upper end of the container BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper-based liquid paper container which is made pourable.

Conventionally, mounting a pump dispenser on the top side of a liquid paper container causes many problems.
For example, if the top side is a commonly used gable-shaped gable top shape, it is necessary to align the mounting angles using an angled flange to orient the pump dispenser vertically downwards Well, it was very complicated.
When the top plate side is flat top shape, a simple-shaped pump dispenser flange can be used. However, since it is necessary to fix within a very narrow range of half or less of the top plate and a small flange is used, there is a problem that force is applied to the mounting portion of the pump dispenser and it is easily deformed .
Furthermore, since the bottom side is generally flat, there is a problem that the remaining amount after pouring out the content is increased.

  In order to solve such problems, Patent Document 1 proposes a paper container main body comprising a head provided with a pump attaching / detaching means and a bottom of an inverted gable roof shape, and the bottom as a bottom stabilizer. We have proposed a pump-delivery liquid paper container equipped with a weir that is fitted over it.

This pump dispensing liquid paper container is flat by forming a recess on the bottom inside and collecting in the recess after dispensing most of the contents, so that the suction tube tip of the pump dispenser is brought close to this. The remaining amount of contents can be less than in the case of the bottom.
However, since the contents are still contained in the container's width-long groove, it is difficult to completely dispense the contents, and it is difficult to completely drain the contents, and it is more reliable to reduce the remaining amount of liquid paper A container was required.
In addition, since the flange fusion surface of the pump dispenser can not be widely taken, the occurrence of wobble due to lack of strength at the pump dispenser attachment portion is apt to occur.
Furthermore, since the paper of the base material is exposed at the end face of the bottom, water may penetrate the base material, mold may be generated, and there was also a problem of unsanitary.

Japanese Patent Application Laid-Open No. 10-147335

  Therefore, it is possible to obtain a liquid paper container having a flat wide surface where the upper surface is easy to mount the pump dispenser, and a bottom surface having a local recess and a slope inclined toward it, so that the amount of remaining liquid is small. It is a subject of the invention.

The present invention relates to a paper container in which paper is used as a base material and both ends of a laminated sheet having a sealant layer made of thermoplastic resin at least on the inner surface are fused to form a cylindrical shape and the cylindrical ends are closed.
It has a pump dispenser on the pouring surface of the upper end of the paper container,
The bottom plate of the lower end has a recess which protrudes outward and is recessed inward, and an inclined surface which inclines in the recess,
It is a liquid paper container characterized in that the suction tube tip of the pump dispenser is close to the inner surface of the recess of the bottom plate.

The paper container of the present invention has the pump dispenser on the pouring surface at the upper end of the paper container, and the bottom of the lower end protrudes outward and has the inclined surface inclining in the recess and the recess, so the remaining of the liquid content Even if the amount decreases, the contents can be collected in the recess along the inclined surface.
And since the tip of the suction tube of the pump dispenser is close to the surface concave portion, most of the content can be sucked and dispensed by the pump dispenser even if the content becomes small.

It is a longitudinal cross-sectional view which shows the example of 1st Embodiment of the liquid paper container of this invention. It is a liquid paper container of this invention, and it is an expanded view of the paper container main body in 1st Embodiment. It is a liquid paper container of the present invention, and is a sectional view near the bottom in a 1st embodiment when the amount of remaining parts of contents falls. FIG. 1 is a perspective view showing the appearance of a container and a crucible in a first embodiment of a liquid paper container according to the present invention. In the second embodiment of the liquid paper container according to the present invention, the step of deforming the bottom portion to move the recess outward when the remaining amount of the content decreases, and collecting and pouring out the content in the recess of the recess It is sectional drawing which shows. It is a liquid paper container of this invention, and it is a perspective view which shows the expanded view of the paper container main body in 3rd Embodiment, and the external appearance of the paper container formed by fuse | melting it. It is a perspective view showing the appearance of the spout used for the liquid paper container of the present invention, and a pump dispenser.

Hereinafter, embodiments of the liquid paper container of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of the liquid paper container of the present invention.
The paper container main body 1 is a paper container in which paper is used as a base material and both ends of a laminated sheet having a sealant layer made of a thermoplastic resin at least on the inner surface are fused to form a cylindrical shape. There is. The pump dispenser 2 can be attached to the top plate 11 at the upper end of the paper container through a spout 111 having a flange.
Further, the bottom plate 13 of the paper container main body 1 protrudes outward to be a recess inside, and has a recess 131 at the lower end inside and a bottom inclined surface 132 inclined from the periphery of the bottom plate toward the recess 131 .
The shape of the bottom plate is a truncated pyramid or a truncated cone having a truncated cone, an inclined surface such as a pyramid and a cone, and a shape in which a recess is formed at the tip of the inclined surface.
The tip of the suction tube 24 of the pump dispenser 2 is brought close to the inner surface of the recess 131 of the bottom plate 13.
On a bottom plate 13 of the paper container main body 1 protruding outward, a collar 3 formed of plastic or the like is fitted to be able to stand.

FIG. 2 is a developed view of a paper container main body in the first embodiment of the liquid paper container of the present invention.
The blank 10 of the paper container main body is made of a laminated sheet having paper as a base material and having a sealant layer made of thermoplastic resin on the inner surface and the outer surface. Of course, it is desirable to provide an inner side with a barrier layer that prevents deterioration of the contents, and a stretchable layer such as a polyamide layer so as not to be easily broken by embossing.

The blank 10 according to the first embodiment has an upper surface plate 11 at the center of the right, and is connected to the left surface plate 12, the bottom surface plate 13, the right surface plate 14 and the upper surface inner plate 1101 to the left following the upper surface plate 11 ing. The upper surface inner plate 1101 bends and fuses the end portion and performs end face processing so that the base end portion of the laminated sheet is not exposed inside.
A front outer plate 113 is formed on the upper side of the upper surface plate 11 through a crease, and further to the left following the front outer plate 113 through a crease, a front upper folding plate 121, a front inner plate 134, and a front lower The folding plate 141 and the front outer inner plate 1131 are connected. The front outer inner plate 1131 bends and fuses the end portion and performs end face processing so that the base end portion of the laminated sheet is not exposed to the inside.
Under the upper surface plate 11, there is a rear outer plate 114 through a ruled line, and further, through each of the ruled lines, to the left following the rear outer plate 114, a rear upper folding plate 122, a rear inner plate 135, a rear The lower folding plate 142 and the rear outer inner plate 1141 are connected. The rear outer inner plate 1141 bends and fuses the end portion, and performs end surface treatment so that the base end portion of the laminated sheet is not exposed to the inside.
The bottom plate 13 is embossed so that the central recess 131 protrudes to the outside of the container and the bottom inclined surface 132 is formed to be inclined from the periphery of the formed central recess 131 to the recess.

In order to make the shape of the paper container main body of the first embodiment, first, the opening hole 112 is pressed and opened at the center of the top plate 11 of the blank 10. The spout 111 is inserted into the opening hole 112 from the inside, and the flange of the spout 111 is fused to the sealant on the inner peripheral edge of the opening hole 112.
Next, the end plate of the left end portion of the blank 10 and the end plate of the right end portion are fused. That is, when both ends of the upper surface inner plate 1101, the front outer plate 113 and the front outer inner plate 1131, and the rear outer plate 114 and the rear outer inner plate 1141 fused to the upper surface plate 11 provided at the right end are fused, It can be in the shape of a square tube.

At the cylindrical ends, the front upper folding plate 121 and the front lower folding plate 141 enter the inside of the front inner plate 134 and the front outer plate 113 while folding inward a portion surrounded by a triangle with a ruled line, Once the front end is fused and closed respectively, and it is folded downward at the fused inner end.
Similarly, the rear upper folding plate 122 and the rear lower folding plate 142 get into the inner side of the rear inner plate 135 and the rear outer plate 114 while folding the portion surrounded by the triangle with the ruled lines inward, and temporarily move the rear side. Each end is fused closed and folded down at the fused inner end.
Thus, the paper container main body 1 folded in while being fused is screwed with the pump dispenser at the spout and attached, and the weir 3 is fitted and stood on the bottom plate 13.

FIG. 3 is a cross-sectional view in the vicinity of the bottom portion in the first embodiment when the remaining amount of the contents is low in the liquid paper container of the present invention.
On the bottom plate 13 of the paper container main body 1 protruding outward, a collar 3 formed of plastic or the like is fitted so as to be erected, and the bottom plate is horizontally fixed.
In addition, the bottom plate 13 of the paper container main body 1 protrudes outward, and a concave portion 131 is provided at the tip of the bottom inclined surface 132 which inclines from the peripheral edge of the bottom toward the center.
Since the tip of the suction tube 24 of the pump dispenser 2 is in close proximity to the inner surface of the recess 131 of the bottom plate 13, the contents are collected at the tip of the suction tube 24 until the end. For this reason, the contents can be reliably sucked and discharged until the end.

FIG. 4 is a perspective view showing the appearance of the liquid sheet container 1 and the weir 3 in the first embodiment of the liquid sheet container of the present invention.
In the liquid paper container of FIG. 4-1, the pump dispenser 2 is attached to the paper container main body 1. As shown in this figure, the upper surface plate 11 has the upper surface inner plate 1101 fused at one side and the end, but most of the upper surface plate 111 is formed of a single blank material, so a large area flange The spout with the can be fused.
For example, the shape of a normal disk-shaped flange shown to FIGS. 7-1 may be sufficient. However, as shown in FIG. 7B, if the flange is widely expanded to have a rectangular shape extended to the front outer plate side and the rear outer plate side, it is easy to receive the pressure pressing the pump dispenser and easily resist deformation. As described above, if the flange of the spout is other than the upper inner plate 1101 fusion-bonded portion of the upper surface plate 11, the fusion of the entire area is possible, and a wide fusion area can be provided.

A crucible 3 shown in FIG. 4B covers the bottom plate of the paper container main body 1 and can be erected, and may be made of plastic or a paper-made rattan having a paper base.
A structure in which the whole is supported by being applied to the bottom plate peripheral edge of the paper container main body is preferable.
In FIG. 4-2, a step 31 is provided in the middle of the side wall of the weir 3 and has a structure in which the corner of the bottom plate edge is placed.
The inside is supported by the ribs 32 and 33, but since the bottom plate protrudes outward, it is set lower accordingly.
In order to give strength to the crucible 3, it is preferable to have a bottom, but it is preferable that the side wall of the peripheral edge be slightly extended downward to facilitate stable fixing. (See Figure 1 and Figure 3)
FIG. 5 shows a second embodiment of the liquid paper container of the present invention, which can be set up without using a weir.
In the second embodiment, the entire bottom plate is in the form of a quadrangular truncated pyramid formed by embossing, and the bottom plate is a bottom plate that protrudes inward, protrudes outward, or is movable.
In addition, a recess 130 is further embossed in the center of the recess 131 at the center of the bottom plate.
5-1 is a longitudinal sectional view showing a state in which the liquid paper container is pressed to the side of the liquid paper container when the remaining amount of the content is low, and the bottom portion is deformed to protrude by the increase of the internal pressure thereof. FIG. By pushing the side surface, the inside of the bottom is made to project downward, a recess is formed inside, and the state is maintained. Then, the contents are transmitted along the inclined surface, and the contents 5 are collected in the recess 130. FIG. 5-1 is a longitudinal cross-sectional view showing a state in which the contents are collected in the recess 130.

FIG. 5-2 is a vertical cross-sectional view showing a state in which the recess 131 having the recess 130 is drawn inward by lowering the internal pressure, which is also a normal standing condition.
In this liquid paper container, the tip of the suction tube 24 of the pump dispenser 3 approaches the recess 130 in a steady state in which the internal pressure is lowered and drawn inward.
In this state, the contents collected in the recess 130 in the center of the bottom plate can be sucked from the tip of the suction tube 24 and can be dispensed by the pump function of the pump dispenser 2.
In this liquid paper container, the contents 5 are accumulated at the periphery of the bottom plate 13 in a steady state, so it is necessary to deform the bottom plate 13 many times and perform the operation of collecting the contents in the recess of FIG. 5-1. There is. Such a bottom plate 13 may be a square frustum like the bottom plate 13 of FIG. 6-1, but it may be a frustum shape, a hexagonal frustum, an octagonal frustum, etc. Absent.
The recess 130 is provided on the inner side of the center of the recess, and the entire recess 131 moves in parallel while the recess 130 is recessed in the inside, and is movable in an inwardly convex state and an outwardly convex state.

FIG. 6 is a liquid paper container according to the present invention, and a perspective view showing the developed view (FIG. 6-1) of the paper container main body in the third embodiment and the external appearance of the paper container main body formed by fusing it. (FIG. 6-2).
A major difference from the first embodiment of the third embodiment is that the positions of the face plate to be the pouring surface 11 and the face plate to be the bottom plate 13 are different.
Further, the recess 130 is provided in the recess 131 of the bottom plate 13.
Also in the third embodiment, the blank 10 of the paper container main body is made of a laminated sheet having paper as a base material and having a sealant layer made of thermoplastic resin on the inner surface and the outer surface.

The blank 10 of the third embodiment has a right plate 14 at the center of the right, and is connected to the bottom plate 13, the left plate 12, the top plate 11, and the right inner plate 1401 to the left following the right plate 14 via the ruled line. ing. The right inner plate 1401 bends and fuses the end, and performs end face processing so that the base end of the laminated sheet is not exposed inside.
Under the right side plate 14, there is a front outer plate 143 through a ruled line, and further, through the respective ruled lines, following the front outer plate 143 to the left, a front lower folding plate 136, a front inner plate 123, a front The upper folding plate 115 and the front outer inner plate 1431 are connected. The front outer inner plate 1431 is bent and fused at its end, and end face treatment is performed so that the base end of the laminated sheet is not exposed to the inside.
There is a rear outer plate 144 on the upper side of the right side plate 14 via a crease, and further, on the left side following the rear outer plate 144 via a crease, a lower lower folding plate 137, a rear inner plate 124, a rear upper The folding plate 116 and the rear outer inner plate 1441 are connected. The rear outer inner plate 1441 bends and fuses the end portion and performs end face processing so that the base end portion of the laminated sheet is not exposed inside.
The bottom plate 13 is embossed so that the central recess 131 protrudes to the inside of the container, and the bottom inclined surface 132 is formed to be inclined from the periphery of the formed central recess 131 to the recess. Furthermore, at the center of the recess 131 there is a large recess 130. This is also formed by embossing.

  In order to make the shape of the paper container main body of the third embodiment, first, the opening hole 112 is pressed and opened at the center of the top plate 11 of the blank 10. The outlet 111 is inserted into the opening hole 112 from the inside, and the flange of the outlet 111 is fused to the sealant on the inner peripheral edge of the opening hole 112. Next, the blank 10 fuses the inner plate at the left end of the laminated sheet and the plate at the right end. That is, when both ends of the right inner plate 1401, the front outer plate 143 and the front outer inner plate 1431, the rear outer plate 144 and the rear outer inner plate 1441 fused to the right plate 14 provided at the right end are fused, It can be in the shape of a square tube.

At the cylindrical ends, the front upper folding plate 115 and the front lower folding plate 136 enter the inside of the front inner plate 123 and the front outer plate 143 while folding inward the portion surrounded by the triangle with the ruled lines, Once the front end is fused and closed respectively, and it is folded downward at the fused inner end.
Similarly, the rear upper folding plate 116 and the rear lower folding plate 137 enter the inner side of the rear inner plate 124 and the rear outer plate 144 while folding inward the portion surrounded by the triangle with the ruled lines, and temporarily go to the rear side. Each end is fused closed and folded down at the fused inner end.
In this way, the paper container body 1 folded in while being fused is screwed with a pump dispenser attached to the spout, and the bottom plate 13 is made to be able to bend inward and stand up.

In the third embodiment, as shown in FIG. 6B, the top plate 11 and the bottom plate do not have a fusion-bonded portion, and the spout having a large-area flange can be fused.
In addition, the fusion between the front inner plate 123 and the front outer plate 143 and the fusion between the rear inner plate 124 and the rear outer plate 144 run vertically in the center of the front and rear sides of the paper container body 1. , The strength in the vertical direction is stronger.

FIG. 7 is a perspective view showing the appearance of the spout and the pump dispenser used for the liquid paper container of the present invention.
Fig. 7-1 shows a normal spout 111, a cylindrical spouted barrel 1111 at the center, an external thread 1112 screwed to a cap attached to the pump dispenser on the outer surface of the spouted barrel, the lower end of the spouted barrel And a flange 1113 that extends flat from the outside to the outside.
The inside of the pouring cylinder 1111 has a large pouring hole 1110, and it is a path through which the contents are poured out while accommodating the pouring cylinder with a valve of the pump dispenser and the like.
The flange 1113 is a circular ring.
FIG. 7-2 is the pouring spout 111 which spreads the flange 1113, is a square flange, and spreads in the range of the top plate to make it easy to withstand the pressure of the pump dispenser.

7-3, the pump dispenser 2 has a pouring nozzle 22 at its upper end, a cap 21 and a pump cylinder 23 at its lower outside, and a suction tube 24 connected further below.
It is preferable to provide a notch 241 at the lower end of the suction tube 24 so as not to be able to aspirate the contents by contacting the bottom plate.
There is a valve and a spring inside the pump cylinder 23. By pushing the pouring nozzle 22, the valve descends and the contents are poured out, and when the pouring nozzle 22 is released, the valve is raised by the spring. Aspirate and store the inside of the pump cylinder.

The laminated sheet of the blank used for the liquid paper container of the present invention may use a thermoplastic resin for the outermost surface and the innermost surface, and may use paper as a substrate, but it improves the storage performance of the contents. Thus, a barrier layer is added in the layer structure, and a polyethylene terephthalate layer or a layer containing a polyethylene terephthalate film having a deposited layer of silicon oxide, aluminum or the like, or a sealant layer inside the polyethylene terephthalate layer It may be a configuration provided.
Moreover, in order to press by high pressure by embossing, you may be the structure which adds a polyamide resin layer etc. between layers so that it may not fracture | rupture by the embossing.
Therefore, as a composition of a lamination sheet, it becomes an ink layer / front sealant layer / paper base material layer / sand polyolefin system resin layer / barrier layer / adhesive agent layer / back sealant layer from front side.

Here, the front sealant layer is a (high pressure method) low density polyethylene or linear low density polyethylene, and is bonded to the paper base layer while extruding the molten resin by the extrusion processing of a T-die extruder.
The surface of the front sealant layer is subjected to corona discharge treatment and printed on the front side to form an ink layer.

The paper base layer uses paper having a basis weight of 200 to 500 g / m ² and a density of 0.6 to 1.1 g / cm ³ .
The sand polyolefin-based resin layer is bonded while extruding the molten resin of the T-die extruder between the paper base layer and the barrier layer.
The sand polyolefin resin to be bonded is high density polyethylene, medium density polyethylene, linear low density polyethylene, (high pressure method) low density polyethylene, polypropylene, ethylene / propylene copolymer, ethylene / methacrylic acid copolymer, ethylene -Resins such as acrylic acid copolymers and ionomers can be used. The thickness is 10 to 60 μm.
The paper substrate or the barrier layer film may be subjected to pretreatment such as corona discharge treatment, ozone treatment, anchor coating, etc. to increase the adhesive strength for bonding.

As the barrier layer, a barrier film in which metal oxide is deposited to 5 to 100 nm on a polyethylene terephthalate film or a polyamide film can be used. As the metal oxide, aluminum oxide, silicon oxide or the like can be used, and a film of 6 to 25 μm is easy to use.
In addition, the film which carried out aluminum vapor deposition to the said film, and the film which bonded aluminum foil may be sufficient. In the case of aluminum foil, one having a size of 5 to 15 μm is easy to use.

The adhesive for bonding the barrier layer and the back sealant layer can be bonded by a dry laminating machine by applying an adhesive for dry laminating or an adhesive for non-solvent type laminating at 0.5 to 7.0 g / m ² . Instead of the adhesive, the above-mentioned sand polyolefin-based resin may be used, and film formation may be performed with a T-die extruder.

  As the back sealant layer, high density polyethylene, medium density polyethylene, linear low density polyethylene, (high pressure method) low density polyethylene can be used. Molding is performed using a T-die extruder or an inflation machine by extrusion, and the thickness is preferably 30 to 100 μm.

It is necessary that the material of the pouring spout be a material having high stress cracking resistance and not easily affected by the contents, and that the material has appropriate rigidity and be easily fused to the back sealant layer.
Moreover, it is preferable to change a material from the cap used for a pump dispenser from insertion property.
Materials usable for the injection port include high density low density polyethylene, linear low density polyethylene, medium density polyethylene, mixed resin of low density and high density polyethylene, ionomer resin, ethylene vinyl acetate copolymer Resin added to and mixed with Among them, linear low density polyethylene is preferable. The material of the above-mentioned pouring spout is molded by injection molding.

  When 場合 3 is made of plastic, materials such as polypropylene, high density polyethylene, linear low density polyethylene, polystyrene, acrylonitrile / styrene copolymer, acrylonitrile / butadiene / styrene copolymer, polymethylpentene, polycarbonate Common resins such as polyamide and polymethyl methacrylate can be used, and they can be manufactured by an injection molding machine using an injection mold. Depending on the shape, the sheet of the thermoplastic resin may be used for compression molding, vacuum molding, or the like.

The liquid paper container of the present invention is as described above, and a user-friendly pump dispenser can be used for the paper container. Moreover, there is no problem that the content of the paper container is large, which has been considered conventionally, and it is a container that can be poured out to the last drop, and the appearance is also a good looking container.
In addition, when manufacturing the blank with a molding machine, it is sufficient to add embossing to the bottom plate portion together, so the price hardly increases and can be manufactured using a general-purpose machine, so it is inexpensive and mass-produced. Sex is also high.
Further, as in the second embodiment, the liquid paper container of the present invention has a great advantage such as being able to be a container which can be set up without using a weir.

1 ......... paper container body 10 ........ blank 11 ........ top plate 1101 ...... top internal plate 111 ----- ... spout 1110 ...... Note Deana 1111 ...... pouring cylinder 1112 ...... male threaded portion 1113 ...... flange 112 ....... Opening hole 113 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・··· · · · front upper folding plate 116 · · · · · · · · · · · · · · left plate 121 · · · · · · · · · · · · · · · · · on post-folding plate 123 ....... before the plate 124 ....... rear inner plate 13 ........ bottom plate 130 ....... recess 131 .. ..... Recess 32 ....... bottom inclined surface 134 ....... before the plate 135 ....... rear inner plate 136 ....... lower front folding plates 137 .... lower folding plates 14 ........ right plate 1401 ...... right in plate 141 ....... lower rear lower folding plates 142 ....... before after ... Folding plate 143 ··· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 2 ······································································································································································· − Suction tube 241 ························································································································ ··Contents

Claims (6)

A paper container which is made of paper and which has a sealant layer made of thermoplastic resin on at least the inner surface thereof is fused to form a cylindrical shape, and the cylindrical ends are closed.
It has a pump dispenser on the pouring surface of the upper end of the paper container,
The bottom plate of the lower end has a recess which protrudes outward and is recessed inward, and an inclined surface which inclines in the recess,
A liquid paper container characterized in that a suction tube tip of a pump dispenser is close to an inner surface of a concave portion of a bottom plate. The bottom plate is shaped to have an inclined surface that inclines toward the recess, and has a recess inside the center of the recess,
The liquid paper container according to claim 1, characterized in that the inclined surface is curved outward or inward, and the tip end of the inclined surface is movable outward convexly or inwardly relative to the periphery of the bottom plate. .   The liquid paper container according to claim 1 or 2, further comprising a weir that can be fitted to the bottom plate peripheral edge and can be attached to the paper container.   It is characterized in that it comprises a paper container in which a cylindrical one side plate formed by fusion bonding the end portions of the laminated sheet is a pouring surface, a side plate facing the other is a bottom plate, and both cylindrical ends are closed. The liquid paper container according to any one of claims 1 to 3. In a method of manufacturing a liquid paper container, a laminated sheet having paper as a base material and having a sealant layer made of a thermoplastic resin on at least the inner surface is fused to form a cylindrical shape, and the cylindrical ends are closed. Open a hole in the pouring surface at the top of the container and fix the pump dispenser,
Emboss the bottom plate of the lower end and make it project outward, and make a concave part where the inside part is concave,
A method of manufacturing a liquid paper container, wherein a suction tube tip of a pump dispenser is brought close to an inner side of a concave portion inside a bottom plate.   From a paper container whose liquid paper container has a cylindrical one side plate formed by fusing the end portions of the laminated sheets as a pouring surface, a side plate opposite to the bottom plate, and both cylindrical ends closed. A method of manufacturing a liquid paper container according to claim 5, characterized in that:

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