JP2014148349A - Paper container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a paper container which is a flat-top type but in which any weak portion such as a perforation or a half-cut is not created and further of which the top face part can be easily opened by a hand as a whole, and to effectively utilize a normal flat-top manufacture line as it is.SOLUTION: In a flat-top paper container, a seal shape in a top seal part of the paper container is chevron-shaped and a non-fused part is included in the vicinity of a top end of the chevron-shaped top seal piece. A width of the non-fused part is set to 10 mm or more.

Description

  The present invention mainly includes liquids such as foods such as liquor, juice and lactic acid beverages, non-foods such as shampoos, body soaps and house detergents, and granules and powders such as granulated sugar, salt and toner. The present invention relates to a paper container that stores and uses paper as a base material.

Conventionally, a laminated sheet used for a paper container has a configuration in which paper is used as a base material, and an inner side surface and an outer side surface are made of a polyolefin resin having excellent heat sealability. Depending on the components of the contents, a gas barrier property can be obtained. A layer to impart was added. For example, in juice and liquor, it is composed of a laminated sheet 5 such as [container outside] polyethylene / paper / polyethylene / inorganic oxide vapor deposition layer / polyethylene terephthalate (hereinafter abbreviated as PET) film / polyethylene [container inside]. Such a configuration is widely used as a container for filling with a fragrance-retaining material or a content that easily oxidizes.
Usually, after such a laminated sheet 5 is punched out, a container formed into a rectangular column having a gable top type, so-called triangular upper surface, is generally used. However, when this container is filled and transported, it is difficult to stack up and down, and space is created, which increases the volume, requires a separate large tray, requires its collection, etc. Secondary problems also occurred and became a major bottleneck.

  As a countermeasure against these problems, a flat top type paper container having a flat upper surface has been proposed. If it is a flat top, there is no need to prepare a separate tray, and even wrapping is possible as a packaging for loading enough, so problems such as tray collection do not occur, and because of the square pillar shape, There is no extra space for loading, which is very efficient.

However, in the case of this flat top type paper container, when it is used up, if the upper surface of the container is fully opened and the contents are taken out, there is a problem that it cannot be opened easily as in the case of the gobeltop type. Opening the upper surface of the container is not only necessary for completely using the contents, but also important for improving the disposal property when the paper resource is effectively used.
In other words, in the case of the govel top type, in order to open the folded top part, the two pieces of the top of the fused top are opened to the left and right, so that the opening of the container can be grasped, and the fusion power of that part is reduced. When the two pieces of paper are pressed toward the center of the opening, the fused half is peeled off so that the opening can be made.

However, in the case of a flat top, the inner surfaces are completely fused together, so it was very difficult to open. For this purpose, a spout stopper is provided on the upper surface, or a hole is made in the paper of the base material in a part to make only a thin film part, and a straw is inserted from there. The content was poured out by cutting it with a method.
However, finally, in order to completely discharge the contents and make it easy to discard the contents, it is necessary to open the entire upper surface portion. In the case of a flat top, it was very difficult to perform this full opening without using a tool such as a bag.

On the other hand, in Document 1, two cuts are provided at the upper edge of the triangular ear formed at both ends of the upper part where the top part is hermetically sealed, and from the outside extending from the cut to the seal part. This is achieved by forming a half-open opening start portion reaching the middle of the paper layer and a planned opening portion connecting the lower ends of the opening start portion. And it has proposed that the opening start part may be perforated or continuous half-cut.
However, such opening start parts and planned opening parts cause a significant decrease in strength, such as when receiving loads from the top during loading, up / down vibrations during transfer, drop impacts, etc. If there is a shortage, there are problems such as liquid leakage and breakage from the opening start portion and the planned opening portion.
Also, if the laminated sheet contains a polyamide-based resin layer, etc., in order to improve the storage suitability of the contents, it is a very difficult task to open it by hand for problems such as difficulty in cutting. there were.

In Reference 2, the inner surfaces of the upper portions of the left and right folded plates and the front and rear upper plates are heat-sealed, the left and right folded plates are respectively folded back and bonded to the upper portions of the left and right side plates. In the left and right folded plates, the upper edge notch, the upper half cut line, and the upper half cut line connecting the lower ends of the upper cut line, respectively. It is provided continuously.
In this method, as in Document 1, the notch of the edge and the semi-cut line of the upper side cause a significant decrease in strength, and when receiving a load from above during loading when transporting, If there are not enough bows, such as up / down vibration during transportation, drop impact, etc., there will be problems such as liquid leakage and breakage problems from the notch on the edge and the semi-cut line on the upper side. there were.
Moreover, the point which becomes very difficult to cut | disconnect depending on a lamination sheet was also the same as literature 1.

Japanese Patent No. 3747500 JP-A-8-143026

  Therefore, although it is a flat-top type paper container, make a paper container that does not create fragile parts such as perforations and half-cuts, and can easily open the entire top surface by hand. It is also an object of the present invention that a normal flat top production line can be used as it is.

  A flat top type paper container, wherein the top seal portion of the paper container is formed in a chevron shape, and an unfused portion is provided in the vicinity of the upper end of the top seal piece formed in the chevron shape. It is.

  The width of the unfused part is 10 mm or more.

  The innermost layer of the top seal piece is an easy peel sealant layer.

  The paper container is characterized in that an overhanging portion that protrudes upward from the top seal piece is provided.

Since the liquid paper container of the present invention is a flat top type paper container having no fragile parts such as perforations and half-cuts, it can withstand vibrations and loads during loading and conveyance, and can increase the number of loaded paper. Moreover, it can be opened easily by pulling the unsealed part without using tools such as scissors.
Furthermore, since it is a flat-top type, no special tray is required, so that it can be distributed even when wrapped in a simple packaging form wrapped with wraps.
In addition, since a special process is not required, an effect such as being able to cope with conventional paper container production facilities can be obtained.

It is an external view of the paper container of this invention. It is a blank when creating an example of the paper container of the present invention, and is a development view of the paper container. It is sectional drawing of the seal | sticker vicinity of the state which sealed the upper surface in the middle of producing an example of the paper container of this invention. It is sectional drawing of the upper surface vicinity of the paper container of this invention. It is an external view in the state where the seal part of the upper surface was raised from the upper surface in order to disassemble and discard the contents of the paper container of the present invention. FIG. 3 is an external view of a state in which an unfused portion is expanded in order to peel and open the seal portion on the upper surface in order to disassemble and discard the contents of the paper container of the present invention. It is sectional drawing of the upper surface vicinity of the state which raised the sealing part of the upper surface from the upper surface in order to decompose | disassemble and discard after discharging the contents of the paper container of this invention. It is sectional drawing of the upper surface vicinity of the state which opened the unsealed part in order to peel and open the sealing part of an upper surface in order to disassemble / dispose after discharging the contents of the paper container of this invention. FIG. 3 is a cross-sectional view of the vicinity of the upper surface in a state in which the unfused portion on the upper surface is expanded and the seal portion begins to be peeled and opened in order to disassemble and discard the contents of the paper container of the present invention. It is sectional drawing of the whole container of the state which expanded the unfused part of the upper surface, and peeled and opened the sealing part in order to decompose | disassemble and discard after the contents of the paper container of this invention were discharged | emitted. It is a figure which shows the shape of the unsealed part provided in the upper surface of the paper container of this invention. It is a figure which shows the example of the seal | sticker shape which seals the upper surface of the paper container of this invention. It is a figure which shows the seal | sticker shape which seals the upper surface of the paper container of a comparative example.

Hereinafter, embodiments of the paper container of the present invention will be described in detail with reference to the drawings.
The paper container body used in the embodiment is a rectangular parallelepiped container as shown in FIG. 1 and uses a laminated sheet. The body part is a side adhesive part 41, and the top part and the bottom part are upper upper side adhesive parts. The paper container having the rectangular parallelepiped container main body 3 is formed by bonding at the bottom side surface bonding part 43 and bonding the four top parts and bottom parts together.
The upper surface has a flat shape, and is a paper container in which a stopper plug mounting hole 2 is opened on the upper surface, and the spout stopper 1 is projected from the stopper plug mounting hole portion. Of course, a paper container without such a spout 1 may be used. The left and right portions of the upper surface portion of the laminated sheet are folded and fused to the side surfaces.

FIG. 2 shows the shape of a blank produced for producing the paper container of FIG. 1, and the laminated sheet 5 is drawn into this shape and molded to produce a paper container.
In this blank, the side-folding fusion portion 410, the top-side folding fusion portion 420, and the bottom-side folding fusion portion 430 that are fused on the inside are folded outward, and the inner layers of the respective fusion-bonding portions are respectively the back side surface portion 311, This is a type in which the heat-sealing resin layer and the inner layer of the back upper surface portion 321 and the back bottom surface portion 331 are fused together, and a skive-hemming type blank is formed by skiving the outer layer outside this innermost layer. But it does n’t matter.
The spout 1 is fused to the blank plug mounting hole 2 shown in FIG. 2, and a fold line 6 shown by a solid line and a valley fold line 7 shown by a broken line are folded, and the bottom and top surfaces are fused. The container is ready.
In the paper container, the right upper surface portion 322 and the left upper surface portion 324 are bent and fused to the right side surface 312 side and the left side surface portion 314 side, respectively.

FIG. 3 shows a state in which a laminated sheet 5 is used in which paper is a base material and the inner surface fusion layer 51 and the outer surface fusion layer 53 are thermoplastic resins having excellent heat sealability, and the upper surface portion is fused at the time of manufacture. In the cross-sectional view, the back upper surface portion 321 and the front upper surface portion 323 are approximately centered and top-sealed. At this time, the right upper surface portion 322 and the left upper surface portion 324 are each folded in half, and the inner surfaces of each are sealed.
However, in these seals, the top seal portion 8 near the container body is fused, but an unsealed portion 9 is provided at the tip.

  FIG. 4 shows such a state in which the mating portion including the top seal portion of the upper surface portion in FIG. 3 is brought down to the opposite side of the spout stopper 1 and the outer layers are fused so weakly that they can be easily separated from each other. Then, after filling the contents, the upper seal part is processed.

  FIG. 5 is a perspective view showing the state of the top seal portion 8 and the unsealed portion 9 of FIG. The top seal portion 8 is formed in a mountain shape. That is, the top seal portion 8 has a long seal width at the mating portion of the back upper surface portion 321 and the front upper surface portion 323, and the seal width of the top seal portion 8 is narrow at the mating portion of the right upper surface portion 322 and the left upper surface portion 324. However, the seal width is gradually reduced from the center toward both ends so that the seal width is gradually reduced.

  FIG. 6 shows that the contents are used, and finally the entire top surface of the paper container is opened, so that the top seal portion 8 of the top surface portion is raised and the outer layers of the back top surface portion 321 are very weakly bonded to each other. It ’s just a natural thing.

  FIG. 7 shows an initial opening state in which the unsealed portion 9 on the upper surface portion of the paper container is opened by hand and the back upper surface portion 321 side and the front upper surface portion 323 side are separately held in the hand. While opening the unsealed portion 9 so as to push it down, hold the unsealed portion 9 firmly with the left and right hands.

  FIG. 8 is a perspective view of the paper container in the state of FIG. 7. The right upper surface portion 322 is peeled off from the right side surface portion 312, the left upper surface portion 324 is peeled off from the left side surface portion 314, and the lower end of the top seal portion 8 is straight. It has become. It is preferable to hold the vicinity of the highest portion of the top seal portion 8 by hand and peel it off.

  FIG. 9 shows a state in which the unsealed portion 9 on the upper surface portion of the paper container has been pulled by hand to start peeling. While lowering the unsealed portion 9 downward, it is opened by pulling left and right.

  FIG. 10 shows a state where the upper surface of the paper container is almost fully opened. When the top seal portion 8 between the back upper surface portion 321 and the front upper surface portion 323 is peeled off, the back upper surface portion 321 and the front upper surface portion 323 which are the inner surfaces of the container are opened widely, The inner surface top seal portion 8 between the surface portions 324 is peeled off.

FIG. 11 is a view showing a seal portion 8 and an unsealed portion 9 on the upper surface portion, and FIG. 11-1 is an example of a seal created by the orthodox blank of FIG. The shape of the top seal portion 8 on the top surface is a mountain shape, and the height gradually decreases from the apex 81 of the top seal portion 8 toward both ends.
Further, the unsealed width 91 of the unsealed portion 9 from the apex 81 of the top seal portion 8 is set to a width of 10 mm or more so that it can be grasped with a sufficient force at least by hand.
FIG. 11B is an example in which the width is set wider only from the apex 81 of the top seal portion 8 to the portion of the unsealed portion 9 ahead to facilitate peeling. Thus, it is not necessary to make the combined width of the top seal part 8 and the unsealed part 9 constant.
FIG. 11C is an example in which the mating surfaces are shifted without making the shape of the unsealed portion 9 symmetrical between the back surface portion 321 side and the front surface portion 323. By this, it will be provided an area where each upper surface part became a single part, it is easy to make a chance to grab each, and the place to grasp is protruding, so it is an example that makes it easy to grasp firmly . of course,
Depending on the configuration of the laminated sheet 5, even if the width of the unsealed portion 9 is not narrow, it is difficult to grip and peel each other due to the waist and slippage of the sheet. .
As described above, the shape of the unsealed portion 9 requires a certain width above the vertex 81 of the top seal portion 8, but even if it is difficult to open due to the properties of the laminated sheet 5 used, The workability can be improved by changing.

FIG. 12 shows the shape of the top seal portion 8 on the upper surface portion of the paper container.
FIG. 12A is a shape having a vertex 81 and is the most preferable shape. However, even if the shape of the seal bar that seals the top surface of the paper container is made into a corner, in order to stabilize the seal, the height of the seal bar is changed, unevenness is applied, and the air between the inner surfaces is sandwiched. When processing such as extrusion is performed, it is not always easy to form the sharp apex 81.
Therefore, as shown in FIG. 12-2, a vertex having a plane with a slight width or a vertex having an arc as shown in FIG. 12-3 may be used.

Although the present invention is as described above, the configuration of the laminated sheet 5 forming the container is that the outermost surface and the innermost surface are made of thermoplastic resin, and if paper is used as the intermediate layer, it is deposited on the paper. A film having a high barrier property may be an intermediate layer under lamination, and the material is not particularly limited.
For example, from the outside, polyethylene / paper / polyethylene,
Polyethylene / paper / polyethylene / inorganic oxide vapor-deposited polyethylene terephthalate / polyethylene,
Polyethylene / paper / polyethylene / aluminum-deposited polyethylene terephthalate / polyethylene,
Polyethylene / paper / polyethylene / aluminum foil / polyethylene terephthalate / polyethylene,
Configurations of polyethylene / paper / polyethylene / ethylene vinyl acetate copolymer saponified product / polyethylene, polyethylene / paper / polyethylene / adhesive resin / polyamide / adhesive resin / polyethylene, and the like are conceivable.

As the front side thermoplastic resin, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, ethylene / propylene copolymer, and the like can be used in addition to high pressure method low density polyethylene.
Further, the thickness of the base paper is adjusted according to the container capacity, and the thickness is increased as the paper container capacity is increased. Usually, the basis weight which is the thickness of paper can be used in the range of 80 g / m ² to 500 g / m ² . In particular, when the paper thickness of the substrate is set to a basis weight of 80 g / m ² to 200 g / m ² , this range is preferable because sealing is possible under normal heat sealing conditions.

A barrier layer may be provided between the paper and the innermost thermoplastic resin. As the barrier layer, an aluminum vapor-deposited polyethylene terephthalate film, an aluminum oxide vapor-deposited polyethylene terephthalate film, a silicon oxide vapor-deposited polyethylene terephthalate film, or the like is used, and the thickness of the polyethylene terephthalate film can be 6 μm to 25 μm.
Further, although not vapor deposition, the barrier layer may be a film obtained by dry-lamination of aluminum foil on a polyethylene terephthalate film, or may be a stretched polyamide film instead of the polyethylene terephthalate film.

The barrier layer and the base paper are usually fused by laminating the molten resin instead of the adhesive while extruding the molten resin between the barrier layer and the paper with an extruder laminator. This molten resin includes high-pressure low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, ethylene / propylene copolymer, ethylene / vinyl acetate copolymer, ethylene-methacrylic acid. Copolymers, ethylene-acrylic acid copolymers, ethylene-methyl acrylate copolymers, ionomer resins and the like can be used. The molten resin used for this lamination is used in a thickness of 3 μm to 60 μm, although it depends on the surface properties of the paper and the strength of the waist.

The barrier layer and the innermost thermoplastic resin may be bonded using a dry lamination adhesive. The amount of the adhesive used for dry lamination is preferably 1 g / m ² to 5 g / m ² . Further, it may be fused by laminating between the barrier layer and the innermost thermoplastic resin while extruding the molten resin with an extruder laminating machine. As this molten resin, in addition to high-pressure method low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, ethylene / propylene copolymer, ethylene / vinyl acetate copolymer, ethylene-methacrylic acid Copolymers, ethylene-acrylic acid copolymers, ethylene-methyl acrylate copolymers, ionomer resins and the like can be used. The molten resin used for this lamination is used in a thickness of 10 μm to 40 μm, depending on the surface properties of the vapor deposition surface.

As the innermost thermoplastic resin, high-pressure low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, ethylene / propylene copolymer, and the like can be used. Furthermore, an easy peel sealant layer can be used for part or all of the innermost layer to improve openability. This easy peel sealant layer is a resin layer in which different materials such as polybutene-1, polypropylene, cyclic polyolefin, and polystyrene are mixed with high pressure low density polyethylene or linear low density polyethylene, and is fused at a low temperature. It is a resin layer that is easy to open and easy to open. The easy peel sealant layer can be used by being laminated on the barrier layer side with a thermoplastic resin such as high-pressure low-density polyethylene, laminated on the innermost surface side, or laminated from the front and back sides.
Of course, it can be used even without a barrier layer.
Printing is performed on the outside of the surface side thermoplastic resin or on the inside of the surface side thermoplastic resin.

The material of the spout 1 is a material that has good adhesion to the sealant layer used in the container body, has high resistance to stress cracking, is hardly affected by the contents, and has a moderate rigidity. There must be something easy to capping.
Further, when a pull ring is formed on the spout 1, the tensile strength needs to be high, and the annular thin brittle wire needs to have various characteristics that break at a constant tensile strength. In particular, when a spout plug integrated with a cap such as a hinge cap is used, the fluidity (MIF) upon melting must be high.
Therefore, materials that can be used for the spout stopper 1 are low-density polyethylene of high pressure method, linear low-density polyethylene, medium-density polyethylene, mixed resin of low-density and high-density polyethylene, ionomer resin, ethylene vinyl acetate copolymer A resin in which a coalescence is added to and mixed with the above. Among these, linear low density polyethylene is preferable. When actually used, after molding using various resins, it is fused to the paper container body, and the content to be filled is used to conduct an environmental stress cracking test and make a judgment.

  Specific examples of the present invention will be described below.

<Example 1>,
As the laminated sheet 5, the lower density polyethylene 20 μm than the outer first layer, the paper 250 g / m ^{2 for} the second layer, the low density polyethylene 20 μm for the third layer, the polyethylene terephthalate 12 μm for the fourth layer, the fifth Low-density polyethylene 30 μm in the layer, sealant layer 30 μm in which 70% low-density polyethylene and 30% polybutene-1 are mixed in the sixth innermost layer
Create a sheet of
A paper container having a square bottom with a side of 60 millimeters and a capacity of 500 milliliters was cut out and formed into a blank shape shown in FIG. 7 to obtain a flat top type paper container.
The shape of the seal portion was the shape of FIG. 12-1, and the unsealed portion was 10 millimeters.

<Example 2>,
As the laminated sheet 5, the lower density polyethylene 20 μm than the outer first layer, the paper 250 g / m ^{2 for} the second layer, the low density polyethylene 20 μm for the third layer, the polyethylene terephthalate 12 μm for the fourth layer, the fifth Create a sheet of low-density polyethylene 50 μm in the layer,
A paper container having a square bottom with a side of 60 millimeters and a capacity of 500 milliliters was cut out and formed into a blank shape shown in FIG. 7 to obtain a flat top type paper container.
The shape of the seal portion was the shape of FIG. 12-2, and the unsealed portion was 10 millimeters.

<Example 3>,
As the laminated sheet 5, the lower density polyethylene 20 μm than the outer first layer, the paper 250 g / m ^{2 for} the second layer, the low density polyethylene 20 μm for the third layer, the polyethylene terephthalate 12 μm for the fourth layer, the fifth Create a sheet of 30 μm of low density polyethylene in the layer, 30 μm of the sealant layer in which 70% of the low density polyethylene and 30% of polybutene-1 are mixed in the sixth innermost layer,
A paper container having a square bottom with a side of 60 millimeters and a capacity of 500 milliliters was cut out and formed into a blank shape shown in FIG. 7 to obtain a flat top type paper container.
The seal part shape was the shape of FIG. 12-3, and the unsealed part was 10 millimeters.

<Comparative Example 1>
As the laminated sheet 5, the lower density polyethylene 20 μm than the outer first layer, the paper 250 g / m ^{2 for} the second layer, the low density polyethylene 20 μm for the third layer, the polyethylene terephthalate 12 μm for the fourth layer, the fifth Create a sheet of low-density polyethylene 50 μm in the layer,
A paper container having a square bottom with a side of 60 millimeters and a capacity of 500 milliliters was cut out and formed into a blank shape shown in FIG. 7 to obtain a flat top type paper container.
The shape of the seal part is the shape of FIG.

<Comparative example 2>
As the laminated sheet 5, the lower density polyethylene 20 μm than the outer first layer, the paper 250 g / m ^{2 for} the second layer, the low density polyethylene 20 μm for the third layer, the polyethylene terephthalate 12 μm for the fourth layer, the fifth Create a sheet of 30 μm of low density polyethylene in the layer, 30 μm of the sealant layer in which 70% of the low density polyethylene and 30% of polybutene-1 are mixed in the sixth innermost layer,
A paper container having a square bottom with a side of 60 millimeters and a capacity of 500 milliliters was cut out and formed into a blank shape shown in FIG. 7 to obtain a flat top type paper container.
The shape of the seal part is as shown in FIG. 13-2.

<Comparative Example 3>
As the laminated sheet 5, the lower density polyethylene 20 μm than the outer first layer, the paper 250 g / m ^{2 for} the second layer, the low density polyethylene 20 μm for the third layer, the polyethylene terephthalate 12 μm for the fourth layer, the fifth Create a sheet of 30 μm of low density polyethylene in the layer, 30 μm of the sealant layer in which 70% of the low density polyethylene and 30% of polybutene-1 are mixed in the sixth innermost layer,
A paper container having a square bottom with a side of 60 millimeters and a capacity of 500 milliliters was cut out and formed into a blank shape shown in FIG. 7 to obtain a flat top type paper container.
The shape of the seal portion was the shape shown in FIG.

<Evaluation results>
The openability evaluation was conducted by employing 10 housewives from ordinary households as evaluators, opening the top seal portion, and testing whether it could be opened without tools in 30 seconds.
For liquid leakage evaluation, 100 paper containers were cut at the top and bottom center, the top seal side container was turned upside down, 100 ml of penetrating solution colored with dye was put in, and a white tissue was laid on the space. Set aside and left at room temperature for 48 hours.
After leaving for 48 hours, the permeation solution was discarded, and it was confirmed that there was no leakage into the tissue or permeation into the paper cross section outside the paper container, and the color permeation state.
The evaluation results of the examples and comparative examples are as shown in the following table.

The paper container of the present invention is as described above, and it is possible to fully open the top of the flat top by hand after discharging the contents easily without using a tool such as a bag. it can.
And even when effectively utilizing paper resources, the flat top portion can be easily fully opened, improving the suitability for cleaning and reusing the inside.
In addition, since it is a flat-top type, the advantages such as reduction of packing, loading, and transportation costs can be fully utilized.
Moreover, the merit of the present invention is great, for example, it is possible to manufacture a flat top type paper container that can use a conventionally used molding line.

1 ······················ • ·························································································・ ・ ・ ・ ・ ・ ・ Right side 313 ・ ・ ・ ・ ・ ・ ・ Front side 314 ・ ・ ・ ・ ・ ・ Left side 321 ・ ・ ・ ・ ・ ・ Back top 322 ・ ・ Upper right Surface portion 323... Upper surface portion 324 .. Left upper surface portion 331... Back bottom surface portion 332. ..Front bottom surface portion 334 ........ Left bottom surface portion 41...
410 ···· Folded side fused portion 42 ··· Upper side adhesive portion 420 ······· Folded top fused portion 43 ········· Side adhesion part 430... Bottom folded fusion part 5 ... Laminated sheet 51 ... Inner surface fusion layer 52 ... Base material layer 53 ... Outer surface fusion layer 6 ... Mountain fold line 7 ... Valley fold line 8 ... Top seal part 81 ..... vertex (seal part)
9 ... Unsealed part 91 ... Unsealed width

Claims (4)

  A flat top type paper container, wherein the top seal portion of the paper container is formed in a chevron shape, and an unfused portion is provided in the vicinity of the upper end of the top seal piece formed in the chevron shape. .   The paper container according to claim 1, wherein a width of the unfused portion is 10 millimeters or more.   3. The paper container according to claim 1, wherein the innermost layer of the top seal piece is an easy peel sealant layer.   The paper container according to any one of claims 1 to 3, further comprising an overhanging portion that protrudes upward from the top seal piece.