TWI707807B - Mountain top packaging container - Google Patents

Abstract

The object of the present invention is to provide a gable-top type packaging container that can be easily folded with less burden on fingers during folding operation. The gable-top packaging container includes: a box top plate, a folding plate folded under the box top plate, a side panel connected to the lower end of the folding plate, and a bending line formed in a predetermined range on the boundary line of the folding plate and the side panel. The fold line is not provided at a predetermined length in the center in the longitudinal direction of the boundary line.

Description

Mountain top packaging container

The invention relates to a mountain-shaped top packaging container.

A gable-top type paper packaging container in which a sheet including a paper base material layer is bent into a box shape, the ends are overlapped and sealed, and the top portion is formed into a gable roof type (see Patent Document 1).

In addition, by arranging a folding line on the gable-top paper packaging container, the user can easily fold the packaging container when the packaging container is discarded. Paper packaging containers that reduce the volume of garbage are also known (see patent Literature 2, 3).

Prior art literature Patent literature

Patent Document 1 JP 2015-85945 A

Patent Document 2 Japanese Unexamined Publication No. 56-43717

Patent Document 3 Japanese Unexamined Publication No. 61-137516

When folding the gable-top type paper packaging container, when the side panel 111 of the box body 102 of the packaging container is to be folded into the inside of the packaging container, as shown in Figure 9, the method is to use your fingers to place between the pair of box top plates 106 The corner 120 where the turn-back plate 108 meets the side panel 111 is pressed into the packaging container. However, in the operation of pressing the corners of the packaging container with fingers, a certain amount of force is required, and during the folding operation, the corners may be trapped by the fingers and hinder the folding operation.

The present invention was developed in view of this problem, and its purpose is to provide a gable-top packaging container that can be easily folded with less burden on fingers during folding operations.

In order to solve the above-mentioned problems, one aspect of the present invention is a mountain-shaped top packaging container, comprising: a box top plate, a folding plate folded under the box top plate, a side panel connected to the lower end of the folding plate, and a side panel formed on the folding plate and The bending line of the predetermined range on the boundary line of the side panel However, the bending line is not provided at the predetermined length portion in the center of the longitudinal direction of the boundary line.

According to the present invention, it is possible to provide a gable-top type packaging container that can be easily folded with less burden on fingers during folding operation.

100‧‧‧Mountain top packaging container

101‧‧‧Top

102‧‧‧Box Body

103‧‧‧Bottom

105‧‧‧Weakened part

106, 106a, 106b‧‧‧Box top plate

107‧‧‧Fold-in board

108‧‧‧Back Folding Plate

110, 110a, 110b, 110c‧‧‧ plain board

111a, 111b‧‧‧ side panel

112‧‧‧Bottom panel

113‧‧‧Sealing Department

116‧‧‧Intermittent

117‧‧‧Protrusion

118‧‧‧Concave

119‧‧‧thumb

120‧‧‧Corner

121‧‧‧Bending line

122 to 124‧‧‧Auxiliary bending line

125‧‧‧Boundary

200‧‧‧Sheet

201‧‧‧Thermoplastic resin layer

202‧‧‧Paper substrate layer

203‧‧‧Adhesive resin layer

204‧‧‧Barrier layer

204a‧‧‧Substrate film

204b‧‧‧evaporated layer

204c‧‧‧Metal foil

205‧‧‧Adhesive layer

206‧‧‧Sealant layer

207a, 207b‧‧‧Wound Processing Department

208‧‧‧Printing layer

Fig. 1 is a perspective view of a gable top packaging container according to an embodiment of the present invention.

Fig. 2 is a front view and a cross-sectional view of a folded back plate and a side panel according to an embodiment of the present invention.

Fig. 3 is a plan view of a plain board according to an embodiment of the present invention.

Fig. 4 is a schematic cross-sectional view of a laminate structure of a sheet according to an embodiment of the present invention.

Fig. 5A is a diagram showing a method for disassembling a gable-top packaging container according to an embodiment of the present invention.

Fig. 5B is a diagram showing a method for disassembling a gable top packaging container according to an embodiment of the present invention.

Fig. 5C is a diagram showing a method of disassembling a gable top packaging container according to an embodiment of the present invention.

Fig. 5D is a diagram showing a method of disassembling a gable top packaging container according to an embodiment of the present invention.

Fig. 6 is a top view of a modification of the plain board of the present invention.

Fig. 7 is a top view of a modification of the plain board of the present invention.

Fig. 8 is a plan view of a modification of the plain board of the present invention.

Fig. 9 is a diagram showing a method of disassembling a gable-top packaging container in the prior art.

[Embodiment of Invention] (Packaging container)

Fig. 1 is a perspective view of a gable top type packaging container 100 (hereinafter referred to as a packaging container 100) according to an embodiment of the present invention, and Fig. 2 is a front view and a cross-sectional view of a folding plate 108 and a side panel 111b. In addition, in the following description, for the convenience of description, the vertical direction when the packaging container 100 is erected is right to be up and down.

The packaging container 100 is formed by bending a blank 110 obtained by processing a sheet material into a box shape, and overlapping and sealing the ends thereof. The packaging container 100 includes: the top of the upper part when erected Part 101, the box body part 102 at the side, and the bottom 103 at the lower part. The top 101 includes two box top plates 106 (106a, 106b), a folded-in plate 107 and a return-folded plate 108 that are folded between the box top plates 106. A side panel 111a is connected to the lower end of each box top plate 106. Furthermore, a side panel 111b is connected to the lower end of each turn-back plate 108. In one example, the side panels 111a and 111b belong to the width direction of the left-right direction when the packaging container 100 is erected, and a weakened portion 105 that weakens the cracking strength is formed so as to surround the box body 102 once. In addition, the weakened portion 105 may not be formed.

As shown in FIG. 2, a bending line 121 is formed on the boundary 125 between the folded-back plate 108 and the side panel 111b. The bending line 121 is not provided in the predetermined length portion in the center of the longitudinal direction of the boundary line 125. Hereinafter, a portion where the bending line 121 is not provided with a predetermined length is referred to as a discontinuous portion 116. The discontinuity 116 is preferably provided on the boundary 125 of the two return plates 108 and the side panel 111b, but it may be provided on only one side. The bending line 121 can be formed by a conventional technique, for example, it can be formed by rolling the plain sheet 110 from both sides by a roller or the like.

As shown in the cross-sectional view of FIG. 2, due to the discontinuous portion 116, the corner 120 with a small radius of curvature is not formed between the folded-back plate 108 and the side panel 111b, and the position becomes a gently curved arc shape.

(Vegetarian Plate)

FIG. 3 is a plan view of an example of a plain sheet 110 used as a material of the packaging container 100. The plain board 110 has: a box top plate (106a, 106b) constituting the top part 101, a folded-in plate 107 and a folded-back plate 108, side panels (111a, 111b) constituting the box body 102, a bottom panel 112 constituting the bottom 103, And a sealing portion 113 formed at the end. At the center of the longitudinal direction of the boundary 125 between the folded-back plate 108 and the side panel 111b connected to the lower end of the folded-back plate 108, a discontinuity 116 is formed at a predetermined length without a bending line 121. The weakened portion 105 is formed on the side panels 111a and 111b so as to surround the box body 102 once.

The width of the discontinuous portion 116 is preferably 7 mm or more, but it may be formed in the entire width direction of the side panel 111b. If the width of the discontinuous part 116 is less than 7 mm, when the packaging container 100 is folded, the fingers cannot be completely put into the discontinuous part 116, and the effect cannot be sufficiently obtained.

(Sheet)

4 is a schematic cross-sectional view of an example of the laminated structure of the sheet material 200 as the laminated body for the plain sheet material 110 and the structure of the weakened portion 105. The sheet material 200 has a printing layer 208/thermoplastic resin layer 201/paper substrate layer 202/adhesive resin layer 203/barrier layer 204/adhesive layer 205/sealant layer 206 in order from the outside to the inside of the packaging container 100.

The thermoplastic resin layer 201 can be formed on the paper base layer 202 by an extrusion lamination method or the like using low density polyethylene resin (LDPE) or linear low density polyethylene resin (LLDPE).

A printing layer 208 can also be provided on the outside of the thermoplastic resin layer 201 to display patterns or product information. The printing layer 208 can be formed by gravure printing or offset printing using conventional ink. The thermoplastic resin layer 201 may be subjected to easy adhesion treatment such as corona treatment to improve the adhesion with the printing layer 208. The outer side of the printed layer 208 can also be provided with an overcoat layer in order to improve wear resistance or improve surface decoration.

For the paper base layer 202, board paper such as milk carton base paper can be used. The weight and density per unit square meter can be appropriately selected according to the container capacity or design. For example, a weight per square meter of 200 g/m ² or more and 500 g/m ² or less and a density of 0.6 g/cm ³ or more and 1.1 g/cm ³ or less can be used.

The adhesive resin layer 203 is a layer composed of a polyolefin resin having a function of bonding the paper base layer 202 and the base film layer 204. Specifically, high density polyethylene resin (HDPE), medium density polyethylene resin (MDPE), LDPE, LLDPE, ethylene-(meth)acrylate copolymer (EMAA), ethylene-acrylate copolymer (EAA) can be used. ), ionomer, polypropylene (PP), etc. In order to improve the bonding strength, corona treatment, ozone treatment, anchor coating, etc. can be applied to the surface of the paper substrate layer 202 or the barrier layer 204. Alternatively, instead of the adhesive resin layer 203, a dry build-up adhesive or the like may be used as the adhesive layer. The thickness is preferably 10 μm or more and 60 μm or less. By using 10μm or more, sufficient bonding strength can be obtained.

The barrier layer 204 can be a vapor-deposited film including a vapor-deposited layer 204b on which a metal such as aluminum, silicon oxide, aluminum oxide, etc. is vapor-deposited, and a base film 204a, or a metal foil 204c such as aluminum laminated on the base film 204a in a dry manner. Laminated film. The thickness of the vapor-deposited layer 204b can be 5 nm or more and 100 nm or less, and when polyethylene terephthalate is used as the base film 204a, the thickness can be 6 μm or more and 25 μm or less.

As the barrier layer 204, a barrier film made of barrier materials such as a barrier coating polyethylene terephthalate film, EVOH, etc., obtained by applying a barrier coating to a polyethylene terephthalate film can be used. When using aluminum foil as the metal foil 204c and polyethylene terephthalate film as the base film 204a for dry lamination, the thickness of the aluminum foil The degree can be 5 μm or more and 15 μm or less, and the thickness of the polyethylene terephthalate layer can be 6 μm or more and 25 μm or less. From the viewpoint of the ease of laser processing described later, the thickness of the polyethylene terephthalate layer is preferably about 12 μm.

In either case, in addition to polyethylene terephthalate (PET), a resin film such as nylon and polypropylene (PP) may be used for the base film 204a. In particular, the biaxially stretched PET film is suitable for the vapor deposition process or the bonding process because it has little expansion and contraction.

The adhesive layer 205 may also be a dry lamination adhesive or a solvent-free lamination adhesive, or a polyolefin-based resin may be bonded by extrusion processing. The coating amount is preferably 0.5 g/m ² or more and 7.0 g/m ² or less.

The sealant layer 206 may use HDPE, MDPE, LDPE, LLDPE, etc. In addition, it may be a layer partially containing polybutene. Among the above materials, LLDPE is particularly suitable. In particular, the density is 0.925 g/cm ³ or less and MI (melt index) 4 or more is preferable. The sealant layer 26 is preferably a non-stretched film formed by a T-die method or an inflation method.

The weakened portion 105 is composed of groove-shaped wound processing portions 207a and 207b formed at least on the paper base layer 202 and the base film layer 204 to a predetermined depth. The wound processing part 207a may be formed at least on the paper base layer 202, and may be formed on the thermoplastic resin layer 201 and the printing layer 208 laminated on the outside of the paper base layer 202 together with the paper base layer 202 as shown in FIG. The wound processing part 207b is preferably formed to a depth that does not penetrate the base film layer 204, but even if it penetrates the base film layer in a narrow range, it has little effect on the barrier properties, so if it is local, it can penetrate the base material. 膜层204。 Film layer 204. The wound processing portions 207a and 207b can be formed by conventional techniques such as laser light or blade molds.

The layered structure of the sheet material 200 is not limited to this structure, and the thickness, layering order, and material of each layer can be arbitrarily changed according to the required functions.

(Dismantling method)

5A to 5D show an example of a method of disassembling the packaging container 100. The steps of the method for disassembling the packaging container 100 are described with reference to FIGS. 5A to 5D.

<Squashing step>

The flattening step of the packaging container 100 is disclosed in FIGS. 5A and 5B. As shown in Fig. 5A, in this step, the user of the packaging container 100 squashes the box body 102 by pressing the two opposing side panels 111a in a direction in which they contact each other. At this time, the side panel 111b is folded toward the inner direction of the packaging container 100.

In this step, the user can use the discontinuity 116. Specifically, as shown in FIG. 5B, by pressing the discontinuous part 116 toward the inside of the packaging container 100 with a thumb 119 or the like, the discontinuous part 116 as a whole will gradually deform, and the return-folding plate 108 and The side panel 111b is folded toward the inside of the packaging container 100.

<Bending Step>

FIG. 5C shows the step of bending the packaging container 100 along the weakened portion 105. In this step, the user first bends the side panel 111 in one direction along the weakened portion 105 (the left image of FIG. 5C). Then, the side panel 111 is bent along the weakened portion 105 in the opposite direction to the previous one (the right diagram of FIG. 5C). The bending action can also be performed multiple times in each direction. Through this step, the weakened portion 105 can be cracked.

<Separation step of box top plate>

FIG. 5D shows the step of separating a part of the top 101 and the side panel 111 from the packaging container 100 along the weakened portion 105. In this step, the user will tear a part of the side panel 111 from the packaging container 100 along the weakened portion 105 (the left image of FIG. 5D). In the previous step, since the weakened portion 105 has been at least partially cracked, the user can separate the upper part of the side panel 111 with a little force from the weakened portion 105 as a starting point. The separated packaging container 100 is shown in the right figure of FIG. 5D. The upper part of the box body 102 and the top part 101, and the lower part of the box body 102 are separated into separate states.

(Variation example)

By adding auxiliary bending lines to the folded back plate 108 and the side panel 111b, the folding operation can be made easier. 6 to 8 are partial top views of plain plates 110a to 110c provided with auxiliary bending lines.

The plain sheet 110a disclosed in FIG. 6 includes an auxiliary bending line 122 composed of one arc-shaped curve and two straight lines surrounding the discontinuity 116. The plain sheet 110b disclosed in FIG. 7 includes the surrounding discontinuity 116 A diamond auxiliary bending line 123 composed of 4 straight lines. The plain sheet 110c disclosed in FIG. 8 includes four auxiliary bending lines 124 formed in a predetermined range on an imaginary line extending from the discontinuous portion 116 to the outer edge of the return plate 108 or the side panel 111b.

As long as the auxiliary bending line surrounds the discontinuous part 116, or is formed in a predetermined range on an imaginary line extending from the discontinuous part 116 to the outer edge of the return plate 108 or the side panel 111b, its shape or number is not limited to The above form.

By adding each auxiliary bending line, the folding plate 108 and the side panel 111b can be bent from the auxiliary bending line, and the movement of the folding plate 108 and the side panel 111b from pressing in to folding can be performed smoothly. Therefore, the folding operation is easier.

[Example]

The packaging containers of Examples 1 to 4 and Comparative Examples were produced, and sensory evaluation was performed on the ease of folding. Prepare the plain boards required to make the packaging container with a capacity of 2 liters, and prepare the packaging container as follows.

(Example 1)

The width of the discontinuous portion 116 is set to 30 mm.

(Example 2)

The width of the discontinuous portion 116 is set to 30 mm, and an auxiliary bending line 122 is formed.

(Example 3)

The width of the discontinuous portion 116 is set to 30 mm, and an auxiliary bending line 123 is formed.

(Example 4)

The width of the discontinuous portion 116 is set to 30 mm, and an auxiliary bending line 124 is formed.

(Comparative example)

The discontinuity 116 is not provided.

A sensory evaluation of the ease of folding of each packaging container was conducted by 30 adult men and 30 adult women. The easily foldable packaging container for more than 80% of the subjects was judged to be a foldable packaging container.

As a result of the evaluation, in the packaging containers of Examples 1 to 4, more than 80% of the subjects can easily fold the packaging containers. On the other hand, in the packaging container of the comparative example, since the discontinuity 116 was not formed, less than 80% of the subjects who could easily fold the packaging container were not formed.

From the evaluation result, it can be confirmed that by forming the discontinuous portion 116 and the auxiliary bending line, an easily foldable packaging container can be provided.

As explained above, according to the present invention, when the user performs the folding operation of the packaging container, since the user can press his finger or the like on the arc-shaped discontinuity 116 with a gradually curved cross section to fold the packaging container 100, it can provide A gable top type packaging container that is easy to fold and bears less burden on fingers during folding operation.

[Industrial availability]

The present invention is very practical for paper packaging containers that contain liquids and the like.

100: Gable top packaging container

101: top

102: box body

103: bottom

105: Weakened part

106, 106a, 106b: box top plate

107: Fold into the board

108: Folding board

111a, 111b: side panel

112: bottom panel

116: Intermittent

121: bend line

Claims (3)

A mountain-shaped top packaging container, comprising: a box top plate; a folding plate folded under the box top plate; a side panel connected to the lower end of the folding plate; and a bending line formed between the folding plate and the side panel In the predetermined range on the boundary line, the predetermined length in the center of the longitudinal direction of the boundary line is not provided with the bending line. The mountain-shaped top packaging container of claim 1, wherein an auxiliary bending line is formed on the return-folding plate and the side panel to surround an area where the bending line is not provided with a predetermined length. For example, the mountain-shaped top packaging container of claim 1, wherein an auxiliary bending line is formed on the folding plate and the side panel, and the auxiliary bending line is formed from a region where the bending line is not provided with a predetermined length to the A predetermined range on an imaginary line where the outer edge of the folded plate or the aforementioned side panel extends.

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