JP6205932B2 - Paper container - Google Patents

Description

  The present invention mainly includes liquids such as liquor, juice, lactic acid beverages, liquids such as shampoos, body soaps, house detergents, liquid fertilizers, herbicides, cat repellents, non-food such as granular fertilizers, powders, granules The present invention relates to a paper container using paper as a base material for storing a body and the like.

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 excellent in heat sealability. 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, it is molded into a gable top type, a container formed into a quadrangular column having a so-called triangular top surface, a flat type, or a container formed with a flat top surface.
The paper container is not bulky with respect to its capacity, but it has the same volume after the contents are discharged, so it must be disassembled to facilitate resource recovery.
However, while the contents are stored in the paper container, drop strength and buckling strength are required. For this purpose, the inner and outer fused parts have been made of a material that has high adhesion strength and is not easily peeled off. It took time and effort.

In order to solve such a problem, Patent Document 1 includes a laminate in which a thermoplastic resin layer, a paper layer, an adhesive resin layer, a gas barrier layer, and a thermoplastic resin layer are laminated in order from the outer surface. And a bevel top type paper container comprising both side plates, a top forming plate, and a bottom forming plate, all areas where the outer surfaces of the top forming plates of the paper container are in contact with each other and all the outer surfaces of the bottom forming plates are in contact with each other. The liquid paper container is characterized in that the adhesive strength adjusting layer is partially formed in the region.
However, in this container, the shape and position of the region in which the adhesion adjusting layer is partially formed are not clarified, and the area of the adhesive strength adjusting layer is simply the shape of a square or the like, and the area of the paper container Only the area range of 10% or more of the area of the area where the outer surfaces of the bottom forming plate and the top forming plate are in contact with each other is presented.

As shown in this patent, in the case of folding, since it does not forcefully peel off, there is no problem because a fusion strength that peels off the fusion part with a large force is not required.
However, when peeling and reusing paper fibers, it is unavoidable to measure the strength at which the peeled portion is peeled at once, and actually peels from one side to the other as a trigger. Therefore, even if there is a low fusion strength part such as an adhesive strength adjustment layer in the center of the large fusion area, if the periphery of the fusion part is the same, there will be no significant change to start peeling, and it will be easy to peel off There is a problem that should not be.
In particular, a large 2 liter or 3 liter sake sake container has a high fusing strength, and the laminated sheet is stiff, and such a method of Patent Document 1 is ineffective for peeling. was there.

In Patent Document 2, in a liquid paper container having a gable roof shape formed by folding a blank made of a laminated board having a paperboard layer as a base material layer and having a heat sealing layer on the front surface layer and the back surface layer, the left panel of the blank and It is characterized in that a peeling varnish coating film is partially formed on one side part from the center of the surface of the top seal part of the right panel, and an easy peel tape is stuck on the back surface of the top seal part of the front panel and the back panel. A liquid paper container is proposed.
If this peeling varnish and easy peel tape are used, there will be a step on the fusion surface, which will cause a significant drop in peel strength, drop strength and buckling strength, and damage due to multi-stage loading. Will occur.

Japanese Patent No. 3853457 Japanese Patent No. 3255075

  Therefore, in the paper-belt type or flat-top type paper container, a paper container that can be easily opened between the inner surfaces without causing a decrease in strength such as loading strength and drop strength at the top seal portion or the bottom seal portion is obtained. That is the subject of the present invention.

The invention according to claim 1 of the present invention is a paper bell type or flat top type paper container,
Out of the fusion range of the inner surface sealant layer , the outer periphery parallel to the outer periphery, the vicinity of the ruled line made of the mountain fold line, and the valley fold line of the inner bent part from the outer periphery near the ruled line made of the valley fold line of the inner bent part A range of more than half of the length of the ruled line, and a valley fold line of the inner bent portion from the outer peripheral side of the portion to be fused in the vicinity of the ruled line consisting of the valley fold line of the inner bent portion of the end surface fused portion The paper container is characterized in that an adhesion-inhibiting varnish is applied to a range excluding a range that is at least half the length of the ruled line .

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Paper container of the present invention is a step for preparing a normal blank of the fusing range of the inner surface sealant layer, parallel to the outer peripheral portion from the outer peripheral edge, a border neighborhood consisting of convex fold, valley fold of the inner bent portion It is fused from the outer peripheral side in the vicinity of the ruled line consisting of lines to the range of more than half the length of the ruled line consisting of the valley fold line of the inner bent part, and in the vicinity of the ruled line consisting of the valley fold line of the inner bent part of the end face fusion part. A paper that allows easy opening of the inner surfaces only by applying the adhesion-inhibiting varnish to a range excluding the range of the ruled line formed by the valley fold line of the inner folded part from the outer peripheral side of the part to be removed. A container can be obtained. Therefore, when the container is discarded, it can be disassembled and washed to a blank state, which has a great advantage in paper recycling and the like.
In addition, although this container is easy to open, it is a paper container having characteristics that do not cause a decrease in strength such as loading strength and drop strength, so the conventional distribution method can be used as it is.

It is an external view of the gobbel top type paper container of the present invention. It is an external view of the flat top type paper container of this invention. It is a development view showing the inner surface of the blank of the first reference example in the gobber top type paper container of the reference example of the present invention. It is a development view showing the inner surface of the blank of the second reference example in the gobeltop type paper container of the reference example of the present invention. FIG. 3 is a development view showing the inner surface of the blank of the first embodiment example 1 in the bevel top type paper container of the present invention. It is a development view showing the inner surface of the blank of Comparative Example 2 in a gobber top type paper container. It is sectional drawing which shows the layer structure of the paper container of this invention. It is a development view showing the inner surface of the blank of the third reference example in the gobeltop type paper container of the reference example of the present invention. It is a development view which shows the inner surface of the blank of the 4th reference example in the bevel top type paper container of the reference example of the present invention. It is an expanded view which shows the inner surface of the blank of a 5th reference example and a 6th reference example by the flap top type paper container of the reference example of this invention. It is an external view which shows two types of examples in the bottom part of the paper container of this invention.

Hereinafter, embodiments of the paper container of the present invention will be described in detail with reference to the drawings.
One of the paper container main bodies used in the embodiment is a paperbell top paper container, as shown in FIG. 1, which has a rectangular parallelepiped shape with a mountain-shaped roof. Using a laminated sheet, the body is bonded to one side corner, the top and bottom are bonded to each other on the top side of the top, and one side corner on the bottom, and the top and bottom of the four sides are folded together. As a result, the paper container has a container body 3 which is shaped like a mountain roof at the end of a rectangular parallelepiped shape. The top surface portion 323 of the top surface having a chevron shape has a stopper mounting hole 2, which is a paper container in which the spout stopper 1 protrudes from the stopper mounting hole.
The right upper surface portion and the left upper surface portion 324 of the top surface of the laminated sheet are folded and fused between the top front surface portion 323 and the back upper surface portion.

The second paper container main body used in the embodiment is a flat top paper container as shown in FIG. 2 and has a rectangular parallelepiped shape. It is a high container. This paper container also uses a laminated sheet, and the body portion is fused so that one side corner portion is aligned, and similarly, the top surface and bottom surface side seal portions are fused.
The top surface is fused so that the inner surfaces of the right upper surface portion 322 and the left upper surface portion on the top side are folded together so that the inner surfaces of the front upper surface portion 323 and the rear upper surface portion 321 are joined together, and the right upper surface portion 322 and the left upper surface portion are respectively The right side surface portion 312 and the left side surface portion are fused.
Also, on the bottom side, the right bottom part and the left bottom part are folded and sandwiched between the front and back bottom parts, bonded together, and the bottom parts of the four sides are also fused together. Thus, a paper container having a rectangular parallelepiped container body 30 is formed.
The top surface has a flat shape, and a cap attachment hole 2 is opened in the top surface portion 323 of the top surface, which is a paper container in which the spout stopper 1 is projected from the plug attachment hole portion. .

FIG. 3A is a development view of the paper container shown as a first reference example of the present invention, as viewed from the inner surface side of the blank of the gobbel-top paper container of FIG.
The laminated sheet 5 used in this container has a top part adhesion-inhibiting varnish application part 81 and a bottom part adhesion-inhibiting varnish application part 82 applied in advance at the time of production of the laminated sheet.
FIG. 3-2 is a diagram showing the fusion range, and the fusion range c of the top portion is located on the back inner surface 321, the right upper surface 322, the front upper surface 323, and the left upper surface 324 on the blank inner surface. This is the part on the band. Further, in addition to the upper portion of the band line, as the top inner fusion range c1, the portion of the right upper surface portion 322 and the left upper surface portion 324 except the folded triangular portion and the back upper surface portion 321 that matches the surface correspondingly. The left and right sides of the top surface portion 323 may be set as the fusion range. In FIG. 3A, the fusion range c of the top portion of the band-like portion is the fusion range.
Further, the fusion range d of the bottom portion is a strip-like portion located below the back bottom surface portion 331, the right bottom surface portion 332, the front bottom surface portion 333, and the left bottom surface portion 334 on the blank inner surface. In addition, in addition to the right bottom surface portion 332 and the left bottom surface portion 334, the portion excluding the triangular portion to be folded, the back bottom surface portion 331 and the left and right surfaces of the front bottom surface portion 333 that match the corresponding surfaces. It is good also as a fusion | melting range. In FIG. 3A, in addition to the band-shaped portion, the right bottom surface portion 332 and the left bottom surface portion 334 except for the triangular portion that is folded, and the back bottom surface portion 331 that matches the surface correspondingly. The left and right sides of the front bottom surface portion 333 are set as a fusion range.
Further, the side fuselage fusion range e includes a band-like portion provided on the outer peripheral side of the back side surface portion 311, the back top surface portion 321, and the back bottom surface portion 331.
Further, as the side surface folding fusion range f, the side surface folding fusion portion 410, the upper surface folding fusion portion 420, the bottom surface folding fusion portion 430, and the upper side surface matching portion 42 and the top portion are adjacent to the fusion range c. There is a portion adjacent to the band-like fusion range of the portion or the bottom portion of the bottom side mating portion 43. Further, in addition to this, a trapezoidal portion at the center of the upper side surface matching portion 42 that matches the surface corresponding to a portion excluding the triangular portion folded at the left upper surface portion 324 and the left bottom surface portion 334, and The trapezoidal portion may be used as the fusion range.

The adhesion inhibiting varnish application part of the first reference example applies the adhesion inhibiting varnish 8 partially in the fusion range in parallel to the periphery of the fusion range and on the fusion surface excluding a certain range. In FIG. 3, in particular, an outer periphery fusion portion 51 is provided in which the non-application portion of the adhesion-inhibiting varnish 8 provided in parallel with the outer periphery rim a of the fusion range is set to 2 to 3 millimeters from the outer periphery rim. The adhesion inhibiting varnish 8 is applied to the other fusion range.
The reason why the outer peripheral fusion part 51 is set to 2 to 3 millimeters from the peripheral edge is that if it is 2 millimeters or less, it becomes too narrow due to variations in positional deviation during printing, and the fusion part may be peeled off and opened. Because.
Moreover, when the outer periphery fusion | melting part 51 is 3 millimeters or more from a periphery, it is because the force for opening becomes high rapidly, and unsealing property falls remarkably.

  Here, the adhesion-inhibiting varnish 8 is composed of ethylene-vinyl acetate copolymer, chlorinated ethylene-vinyl acetate copolymer, chlorinated polyethylene, chlorinated polypropylene, cyclized rubber, polyamide resin, urethane resin, acrylic resin, cellulose. It is a varnish composed of a simple resin or alkyd resin, or a mixture thereof.

The blank laminated sheet 5 is subjected to fold line processing along the valley fold line 6 and the mountain fold line 7, and the outer shape is extracted with a punching blade.
In the manufacturing method for assembling the paper container, in the case of a paper container provided with the spout stopper 1, first, the spout stopper 1 is fused to the spigot attachment hole 2. Then, the fold line portion between the side surface matching portion 41 and the side surface folded fusion portion 410 at the corner portion of the body portion is aligned with the fold line portion between the upper side surface matching portion 42 and the upper side surface folded fusion portion 420 or the bottom side surface alignment. Along with the fold line between the portion 43 and the bottom side folded-back fusion portion 430, the outer surface side corresponding to each is sealed. That is, the side-surface folded portion 410, the upper-side folded portion 420, and the bottom-side folded portion 430 are fused to the inner surfaces of the side-surface fused portions e of 311, 321, and 331, respectively. Thus, the folded portion can prevent the end face of the laminated sheet from coming out of the container. Thereafter, the bottom part is fused, the contents are filled, and the top part is fused to finish.
Thus, except for the step of applying the adhesion inhibiting varnish 8, the conventional production line can be used as it is, as is the case with the production of the conventional paper container.

FIG. 4 is a developed view of the paper container shown as the second reference example of the present invention, as viewed from the inner surface side of the blank of the gobbel top type paper container of FIG.
It is characterized in that the adhesion inhibiting varnish 8 is applied in the form of stripes that are parallel to the inner peripheral edge b of the inner surface sealant layer and are alternately provided with a constant width.
It is preferable that the width of the application portion and the non-application portion of the adhesion inhibiting varnish 8 be approximately 1 millimeter.
The paper container in which the adhesion-inhibiting varnish 8 is applied in a stripe shape has an uncoated portion in parallel from the inner peripheral edge of the fusion range, so that there is no leakage of the contents and a certain peel strength, and a drop strength And it is designed to keep the loading strength.

FIG. 5A is a development view of the paper container shown as a first example of the present invention, as viewed from the inner surface side of the blank of the gobbel-top paper container of FIG.
As shown in FIG. 5B and FIG. 5C, the adhesion inhibiting varnish 8 application portion of the first example includes the outer peripheral portion 51 parallel to the outer peripheral edge in the fusion range of the inner surface sealant layer, and the mountain fold line 7. The area near the ruled line 71 including the valley fold line 6 of the inner folding part 63 and the outer peripheral side of the ruled line 6 including the valley fold line 6 of the inner folding part 63 to the range of more than half the length of the ruled line composed of the valley fold line 6 of the inner folding part. Except for a range that is not less than half the length of the ruled line formed by the valley fold line 6 of the inner bent part 63 from the outer peripheral side of the portion that is fused in the vicinity of the ruled line formed by the valley fold line 6 of the inner bent part 63. The range of fusion of the inner surface sealant layer.
Then, a border neighborhood consisting of valley fold lines 6 of the inner bent portion 63 which is bent, and the portion of the end surface fusion part 64 which borders near the fusion consisting of valley fold lines 6 of the inner bent portion 63, bent inner side The inner bent portion adhesion inhibiting varnish applying portion 83 and the inner bent portion end face adhesion inhibiting varnish applying portion 830 have substantially the same length within a range not exceeding one half of the length of the ruled line composed of the valley fold line 6 of the portion 63. Apply so that

FIG. 6A is a development view of the paper container used in Comparative Example 2 of the present invention, as viewed from the inner surface side of the blank of the gobbel-top paper container of FIG.
As shown in FIG. 6B, in the fusion range, the bottom portion is provided with an adhesion-imparting varnish non-applied portion having a width of 0.5 mm only in the vicinity of the outer peripheral peripheral edge portion and the ruled line, and the top portion is parallel to the top folding line 34. Only the peripheral edge of the outer periphery is provided with an adhesion-imparting varnish-uncoated portion having a width of 0.5 mm.

FIGS. 7-1 and FIGS. 7-2 have shown the structure of the lamination sheet in the cross section.
FIG. 7A is an example in which the adhesion-inhibiting varnish 8 is applied to the front and back, and the surface of the base paper 91 is coated with a sealant layer 92. A polyethylene terephthalate film layer 94 with silicon oxide vapor deposition is laminated on the back surface side of the base paper 91 via a low density polyethylene layer 93, and a thick sealant layer 95 is further stuck on the inner surface.
In this example, the surface of the sealant layer 92 is printed. Printing on the front side is a case where there is a merit that it is easy to cope even when the production lot of the base paper is small.
The back adhesion inhibiting varnish layer 97 and the front adhesion inhibiting varnish layer 98 are applied because the sealant layer is printed in a state where the adhesion inhibiting varnish 8 is transparent by printing and is the foundation of the adhesion inhibiting varnish layer. Therefore, even if there is some inhibitory substance, there is a possibility that the layer surface will be firmly fused. Therefore, the adhesion inhibiting varnish 8 is applied to the same position on the front and back sides in a place where it is desired to reliably inhibit strong fusion.
There is a merit that the same plate can be turned upside down when the adhesion inhibiting varnish 8 is applied to the same position on the front and back sides. However, there are many places where the surface side is not fused, so only the part that is fused on the outside is limited. preferable.

FIG. 7-2 is an example in which a printing layer 96 is provided on the surface of the base paper 91 and a sealant layer 92 is provided thereon. Then, a polyethylene terephthalate film layer 94 with silicon oxide vapor deposition is bonded to the inner surface side by extruder lamination via a low density polyethylene layer 93, and a sealant layer 95 is bonded to the inner layer. A back adhesion inhibiting varnish layer 97 is printed on the inner surface.
In the case where the adhesion-inhibiting varnish layer only needs to cause a decrease in fusion power of about 10 to 30 percent, the inner surface can be dealt with only the adhesion-inhibiting varnish layer.

FIG. 8 shows a paper container of a third reference example in which a non-application portion is provided 4 to 6 millimeters wide from the inner peripheral edge b of the fusion range of the inner surface sealant layer, and an adhesion inhibiting varnish 8 is applied to the outside thereof.
In the case of a large-capacity paper container that requires drop strength and buckling strength, the bottom portion has a larger width of the non-coated portion, and the non-coated portion is 6 to 15 mm wide from the inner peripheral edge of the fusion range. Is provided. By firmly fusing the portion in contact with the contents, the penetration of the contents is blocked, and it is possible to cope with contents that are stored for a long period of time or contents that are easily penetrated.
Further, by applying the adhesion-inhibiting varnish 8 on the outer side, when the paper container is disassembled, it is easy to create a trigger for peeling, so there is an advantage that it is easy to disassemble.
However, on the contrary, in the vicinity of the portion bent inward, the repulsive force is large, and fusion is performed against the repulsive force, so that there is a problem that it is difficult to narrow the strong fusion width.

FIG. 9 is a developed view of the inner surface of a blank of a paper container having higher drop strength and buckling strength than the paper container of FIG.
As shown in FIGS. 9-2 and 9-3, the adhesion inhibiting varnish 8 application part of the fourth reference example is provided with a non-application part at a width of 4 to 6 mm from the inner peripheral edge of the inner surface sealant layer fusion range, It is a paper container in which an adhesion inhibiting varnish 8 is applied to the outside.
Adhesion inhibitory varnish 8 application part, of the inner surface sealant layer fusing range, the inner peripheral portion 52 parallel from the inner circumferential periphery, and border near 71 consisting of convex fold 7, the valley fold lines 6 of the inner bent portion 63 In the vicinity of the ruled line formed by the valley fold line 6 of the inner bent part 63 of the end face fusion part 64 and the range of more than half of the length of the ruled line formed by the valley fold line 6 of the inner bent part from the inner peripheral side in the vicinity of the ruled line A fusion range of the inner surface sealant layer excluding a range of at least half of the length of the ruled line formed by the valley fold line 6 of the inner bent portion 63 from the inner peripheral side of the portion to be fused .
Then, a border neighborhood consisting of valley fold lines 6 of the inner bent portion 63 which is bent, and the portion of the end surface fusion part 64 which borders near the fusion consisting of valley fold lines 6 of the inner bent portion 63, bent inner side An inner bent portion adhesion inhibition varnish application portion (fourth reference example) 831 is provided within a range not exceeding one half of the length of the ruled line formed by the valley fold line 6 of the portion 63, and the inner bent portion end surface adhesion inhibition varnish is provided. The application part (fourth reference example) 832 is also set so as to be applied to substantially the same position as the inner bent part adhesion inhibition varnish application part 831 .
In the case of a large-capacity paper container that requires drop strength and buckling strength, the bottom portion has a larger width of the non-coated portion, and the non-coated portion is 6 to 15 mm wide from the inner peripheral edge of the fusion range. Is the same as in the third example.
Further, a slight adhesion-inhibiting varnish is applied to the outer peripheral portion of the ruled line vicinity 71 . This makes it easy to perform peeling continuously, and it may be about 1 to 3 millimeters.

10 is a blank of a flat top paper container, FIG. 10-1 is an example in which an adhesion inhibiting varnish application part is provided on the inner periphery of the fusion range, and FIG. 10-2 is an adhesion inhibition on the outer periphery of the fusion range. This is an example in which a varnish application part is provided.
The bottom is the same as the top of the bell and the shape in the vicinity of the top has changed to a flat top.

FIG. 11 is an external view of the bottom surface of the paper container.
FIG. 11A shows a normal bottom state in the paper container of the present invention. The bottom right bottom surface portion 332 and the left bottom surface portion 334 are folded inward to form a bottom surface fusion portion 43 in which the inner bottom surfaces of the back bottom surface portion 331 and the front bottom surface portion 333 are fused. In the drawing, the front and bottom surface portions 333 are folded back to form a bottom surface folded and fused portion 430.
In FIG. 11-2, an unsealed opening hook 3311 is provided to facilitate opening at the tip of the back bottom surface portion 331 of the bottom surface fusion portion 3310 that is not folded back. The opening ridge 3311 may be coated with the adhesion-inhibiting varnish 8 on the inner surface, but it is preferable to perform a non-fusing treatment so as not to be surely fused.
FIG. 11C shows a cross section slightly shifted in the 332 direction from the center.
In addition, when opening, it is necessary to take measures such as providing a circular arc at the base or widening the shape as a strong shape so that the opening trough 431 is not cut.

The laminated sheet 5 used in the paper container of the present invention may be made of a thermoplastic resin on the outermost surface and the innermost surface, and paper may be used as the base material, but the storage performance of the contents is enhanced. A structure having a layer containing a polyethylene terephthalate layer or a polyethylene terephthalate film having a vapor deposition layer such as silicon oxide or aluminum in the layer structure, or a structure having a sealant layer inside the polyethylene terephthalate layer, Also good.
For example, polyethylene / paper / polyethylene / polyethylene terephthalate / release varnish (partial) / sealant,
Polyethylene / paper / polyethylene / inorganic oxide vapor-deposited polyethylene terephthalate / peeling varnish (partial) / sealant,
Polyethylene / paper / polyethylene / aluminum-deposited polyethylene terephthalate / release varnish (partial) / sealant,
Polyethylene / paper / polyethylene / aluminum foil / urethane adhesive / polyethylene terephthalate / peeling varnish (partial) / sealant,
Such a configuration is conceivable.

As the front side thermoplastic resin in the laminated sheet 5 of the paper container, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, ethylene / propylene copolymer, etc. can be used in addition to the 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 200 g / m ² to 500 g / m ² .

  Between the paper and the sealant layer in the laminated sheet 5 of the paper container, an aluminum-deposited polyethylene terephthalate film, an aluminum oxide-deposited polyethylene terephthalate film, a silicon oxide-deposited polyethylene terephthalate film, an ethylene-vinyl alcohol copolymer film, an aluminum foil and polyethylene A terephthalate laminate film or the like is used, and a thickness of 5 μm to 25 μm can be used.

  The barrier layer and the base paper in the laminated sheet 5 of the paper container are usually melted by laminating the molten resin as an adhesive while extruding the molten resin between the barrier layer and the paper with an extruder laminator. Put on. The molten resin to be used 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. An acid copolymer, an ethylene-acrylic acid copolymer, an ethylene-methyl acrylate copolymer, an ionomer resin, or the like can be used. The molten resin used for this lamination is used in a thickness of 10 μm to 50 μm, preferably 20 μm to 40 μm, depending on the surface properties of the paper and the strength of the waist.

A dry lamination adhesive may be used between the barrier layer and the innermost sealant layer in the laminated sheet 5 of the paper container. 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 between the barrier layer and the innermost sealant layer by extruding a molten resin with an extruder laminating machine. In addition to high-pressure low-density polyethylene, this molten resin includes linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, ethylene / propylene copolymer, ethylene / vinyl acetate copolymer, and ethylene-methacrylic acid copolymer. A polymer, an ethylene-acrylic acid copolymer, an ethylene-methyl acrylate copolymer, an ionomer resin, or the like can be used. The molten resin used for this lamination is used in a thickness of 10 μm to 40 μm.

As the innermost sealant layer in the laminated sheet 5 of the paper container, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, ethylene / propylene copolymer, and the like can be used in addition to the high pressure method low density polyethylene. 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 dissimilar materials such as polybutene-1, polypropylene, cyclic polyolefin, polystyrene, and tackfire are mixed with high-pressure low-density polyethylene or linear low-density polyethylene. It is a resin layer that can be easily fused and easily opened. 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.
Similarly, a similar thermoplastic resin layer is provided on the outside of the base paper. In this case, printing is performed on the outside of the surface side thermoplastic resin or on the inside of the surface side thermoplastic resin.
The thickness of the sealant layer used for the innermost layer is suitably 20 μm to 80 μm, preferably 30 μm to 70 μm, and the thickness of the outermost surface side thermoplastic resin is 5 μm to 60 μm, preferably 10 μm to 40 μm.

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 include 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, and ethylene vinyl acetate. A resin obtained by adding and mixing a polymer to 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.
The material of the spout stopper 1 described above is molded by injection molding, and is fused to the stopper plug mounting hole 2 in the sleeve state in which the side end portion of the paper container is molded.

As shown above, the adhesion inhibiting varnish 8 used for the top seal portion and the bottom seal portion in the present invention is composed of ethylene-vinyl acetate copolymer, chlorinated ethylene-vinyl acetate copolymer, chlorinated polyethylene, chlorinated It is a varnish composed of a simple substance of polypropylene, cyclized rubber, polyamide resin, urethane resin, acrylic resin, cellulose resin, alkyd resin, or a mixture thereof. The adhesion-inhibiting varnish 8 is applied by applying a pattern using a gravure printing machine or a silk screen printing machine.
At this time, if the adhesion inhibiting varnish 8 is slightly colored, the position can be easily confirmed in the next step.

Hereinafter, specific examples and comparative examples of the present invention will be described.
(Example 1) A laminated sheet was prepared from the outside in the following configuration.
First layer: low density polyethylene 20 μm
Second layer: 320 g / m ² of paper (printed product)
Third layer: low density polyethylene 30 μm
Fourth layer: Polyethylene terephthalate 12 μm
5th layer: Aluminum vapor deposition layer: 20 nm by vapor deposition on polyethylene terephthalate film
Sixth layer: dry lamination adhesive 3 g / m ²
Seventh layer: low density polyethylene 50 μm
Eighth layer: Adhesion inhibition varnish of ethylene-vinyl acetate copolymer 0.5 g / m ²
The manufacturing process was created in the order of the following 1) to 6).
1) Aluminum vapor-deposited polyethylene terephthalate and the seventh layer of low-density polyethylene are bonded together with an adhesive using a dry lamination machine.
2) The film pasted in 1) and the paper on which the pattern has been printed are pasted together by an extrusion laminating machine through low density polyethylene.
3) Extrude low density polyethylene on paper and paste it together with a laminator.
4) The adhesion-inhibiting varnish 8 is printed on the low density polyethylene of the outermost layer and the innermost layer.
5) Pull out the outer shape with a punching blade and provide crease lines.
6) Form into a paper container shape while bonding.
The printed pattern of the adhesion-inhibiting varnish 8, the ruled lines, and the outline extraction pattern were the blank shape shown in FIG.

( Reference Example 1 ) The laminated sheet was the same as in Example 1.
The printing pattern of the adhesion-inhibiting varnish 8, the ruled lines, and the outline extraction pattern were the blank shape shown in FIG.

(Comparative Example 1) The laminated sheet was the same as in Example 1.
However, the adhesion-inhibiting varnish 8 was not printed at all, and the ruled line and outer shape extraction pattern was the blank shape of FIG.

(Comparative Example 2) The laminated sheet was the same as in Example 1.
The printed pattern of the adhesion-inhibiting varnish 8, the ruled lines, and the outline extraction pattern were the blank shape shown in FIG.

<Evaluation method>
The moldability was checked with a paper container molding machine.
Ease of disassembly was confirmed by the total score of five panelists who disassembled the paper container with bare hands and evaluated the ease of disassembly with two easy points, one intermediate point, and zero difficult points. (Full score is 10 points)
The container water vapor permeability was measured by measuring the weight change in an environment where the temperature was 40 ° C. and the relative humidity was 90% with calcium chloride enclosed in the container.

<Evaluation results>
Example 1 of the present invention, reference example 1 both formability, easy disassembly may, container water vapor permeability was also comparable to Comparative Example 1 paper container did not adhesion inhibited varnish 8.
In Comparative Example 1, the ease of dismantling was remarkably poor and could not be easily opened manually.
In Comparative Example 2, the easy disassembly was good, but the moldability was inferior, the container water vapor permeability was remarkably large, and the content protection performance was problematic.

本発明の紙容器は、以上のようなもので、ブランクを製造する時に、予め、必要な箇所にだけ、接着阻害ニスを印刷しておくことで、落下強度、座屈強度、密封性などを保持しながら、解体する時には、容易に解体しやすいように、設計された紙容器である。
このような解体しやすい紙容器を提供できれば、紙容器の再利用も図りやすくなると共に、紙容器の利便性が向上し、より、紙容器の普及が図られることになると期待される。

The paper container of the present invention is as described above, and when manufacturing a blank, by printing an adhesion-inhibiting varnish in advance only at necessary places, the drop strength, buckling strength, sealing performance, etc. It is a paper container designed to be easily disassembled when dismantling while holding.
If such a paper container that can be easily disassembled can be provided, it is expected that the paper container can be easily reused, the convenience of the paper container is improved, and the paper container is more widely used.

1 ·······································································································································・ Flat top type paper container main body 300 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal surface 311 ・ ・ ・ ・ ・ ・ Back side surface portion 312 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Right side surface portion 313 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Front side surface portion 314・ ・ ・ ・ ・ Left side 321... Back upper surface 322 .. Right upper surface 323 .. .. Front upper surface 324. ··················································································································· Front bottom 334 ······ Left bottom 41 ··· Side weld (body)
410 ···· Folded side fused portion 42 ····················································· Matching portion 430... Bottom folded fusion portion 5... Laminated sheet 51. Circumferentially fused portion 6 ······························· 61・ ・ End face fusion part 7 ・ ・ ・ ・ Valley fold line 71 ・ ・ ・ ・ ・ ・ Rule line fusion part 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Adhesion inhibition varnish 80 ... Fusion part 81 without adhesion inhibiting varnish ......... Top adhesion inhibiting varnish application part 82 ......... Bottom adhesion inhibition varnish application part 83 ......... Inner bent area adhesion inhibition varnish coating Part 830 ....... inner folded end surface adhesion inhibiting varnishing unit 831 ....... inner bent part adhesion-inhibiting varnishing unit (fourth example)
832 ・ ・ ・ ・ ・ ・ ・ Inner bent part End face adhesion inhibition varnish application part (4th example)
84... Side adhesion inhibiting varnish application section 91... Paper 92... Surface sealant layer 93. ........ Silicon oxide-deposited polyethylene terephthalate 95 ..... Inner surface sealant layer 96 ..... Printing layer 97 ..... Back adhesion inhibiting varnish layer 98 ... Surface adhesion inhibiting varnish layer a ... Outer peripheral edge (inner surface sealant layer) of fusion range
b ..... Inner peripheral edge (inner surface sealant layer) of fusion range
c ······················································································································· ··· Body fusion range f ··· Side fold fusion range

Claims (1)

In a paper container of a gobel top type or a flat top type,
Out of the fusion range of the inner surface sealant layer , the outer periphery parallel to the outer periphery, the vicinity of the ruled line made of the mountain fold line, and the valley fold line of the inner bent part from the outer periphery near the ruled line made of the valley fold line of the inner bent part A range of more than half of the length of the ruled line, and a valley fold line of the inner bent portion from the outer peripheral side of the portion to be fused in the vicinity of the ruled line consisting of the valley fold line of the inner bent portion of the end surface fused portion A paper container in which an adhesion-inhibiting varnish is applied to a range excluding a range that is at least half the length of a ruled line .

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