JP6065444B2 - Liquid paper container - Google Patents

Description

  The present invention relates to a liquid paper container that stores liquid contents, and more particularly to a liquid container that stores liquid contents containing hydrogen peroxide.

  Conventionally, as for hair color, a two-pack type product using a first agent of a color agent and a second agent of an oxidizing agent is commercially available. In particular, the second agent is an aqueous solution containing hydrogen peroxide as a main component and is relatively stabilized at a temperature of about 20 ° C., but has a problem of gradually decomposing while generating oxygen gas.

  The packaging container for storing the second agent has a problem that it expands due to the generation of oxygen gas, and requires rigidity. Therefore, a bottle container made of polyethylene resin is used.

  However, when such a bottle container is disposed of after use, there is a problem that it is bulky because it cannot be crushed and reduced in volume.

  In order to solve these problems, a packaging container containing the second agent, wherein the oxygen permeability of the packaging container is equal to the amount of oxygen gas generated per unit time generated by the decomposition of hydrogen peroxide, or There is a proposal for a packaging container made of a film that is larger than that and has a water vapor transmission rate substantially equal to a value obtained by dividing the mass by which hydrogen peroxide decomposes per unit time is divided by the hydrogen peroxide content (Patent Document) 1).

  However, this packaging container is a gusset type packaging container, and has a form in which a through hole and a connector that can be opened and closed are connected to a part of the lower part of the packaging container. The film constituting the packaging container may be selected from oxygen permeability and water vapor permeability, but the packaging form is complicated, and the packaging container is a flexible laminated film. There are problems that are difficult to handle.

  Therefore, there is a demand for a packaging container for the second agent that has rigidity, is easy to handle, and can be crushed and reduced in volume during disposal.

  In order to meet these requirements, there is a liquid paper container as a packaging container. The paper container has rigidity, can be easily poured out if a mouth plug is attached, and can be reduced in volume after use.

  The liquid paper container, which is usually used for milk or the like, is simply composed of a laminate comprising a polyethylene layer / paper substrate layer / sealant layer. However, the laminated plate can permeate oxygen gas generated from the second agent and suppress the expansion of the paper container. However, there is a problem that the rigidity of the paper container is insufficient. Pinholes may occur. If a pinhole occurs, there is a concern that the contents may leak.

  Moreover, in order to improve these, there exists what laminated | stacked the polyester film on the intermediate | middle layer. For example, in the laminated sheet of polyethylene layer / paper substrate layer / polyethylene layer / polyester film / sealant layer, heat resistance is improved by laminating polyester film, so that pinholes are prevented from occurring during sealing. However, since the polyester film has a lower oxygen permeability than the polyethylene layer (film) and the sealant layer (film), there is a problem that the paper container expands due to the generated oxygen gas.

  Therefore, there is a need for a liquid paper container that stores the second agent and does not expand due to oxygen gas, is rigid and easy to handle, and can be reduced in volume after use.

JP 2003-267454 A

  In view of the problems of the background art, the present invention is a paper container for storing a hair color second agent, a liquid paper container that does not expand by oxygen gas, has rigidity, is easy to handle, and can be reduced in volume after use. It is to provide.

  In order to solve the above problems, the inventors have intensively studied and completed the present invention.

The invention according to claim 1 of the present invention is a blank comprising a laminated board in which a paperboard is used as a base material layer, and a thermal adhesive resin layer / base material layer / adhesive resin layer / gas barrier layer / adhesive layer / sealant layer are sequentially laminated. A rectangular cylindrical liquid paper container having a sealant layer as an inner surface, a fold line is folded and sealed,
In the liquid paper container, a large number of fine holes are formed only in the gas barrier layer.

The invention according to claim 2 of the present invention, the size of the micropores is in the range of 0.01 to 10 mm ^2, the ratio of the surface area of the blank and the total area of the fine pores of from 0.01 to 50% 2. The liquid paper container according to claim 1, wherein the liquid paper container is formed from a range.

  The invention according to claim 3 of the present invention is the liquid paper container according to claim 1 or 2, wherein the fine holes are engraved by a laser.

  The invention according to claim 4 of the present invention is the liquid paper container according to any one of claims 1 to 3, wherein the gas barrier layer is a polyester film having an inorganic oxide vapor deposition layer. is there.

  The invention according to claim 5 of the present invention is the liquid paper container according to claim 4, wherein the inorganic oxide is silicon oxide or magnesium oxide.

  The invention according to claim 6 of the present invention is the liquid paper container according to any one of claims 1 to 5, wherein the liquid paper container is a gable top type paper container or a flat top type paper container. is there.

Liquid paper container of the present invention, only the gas barrier layer, since a large number of micropores formed by engraved, oxygen gas generated from the second agent is reasonably transparent, is intended to suppress the expansion of the paper container . Moreover, it is a liquid paper container that is easy to handle due to the rigidity of the paper container and can be reduced in volume after use.

According to claim 1 of the present invention, a blank comprising a laminated board in which a paperboard is used as a base material layer and a thermal adhesive resin layer / base material layer / adhesive resin layer / gas barrier layer / adhesive layer / sealant layer are sequentially laminated, This is a rectangular cylindrical liquid paper container with the sealant layer as the inner surface, the fold line is folded and sealed, and it is generated from the second agent by engraving a large number of fine holes only in the gas barrier layer. Oxygen gas can be appropriately permeated from the paper container to suppress expansion.

According to claim 2 of the present invention, the size of the micropores is in the range of 0.01 to 10 mm ^2, the ratio of the surface area of the total area and the blank of the micropores is in the range of 0.01 to 50% Thus, oxygen gas can be permeated appropriately, and expansion of the paper container can be suppressed. Further, the water vapor permeability does not change greatly, and the quality of the contents can be maintained. There is no expansion of the paper container due to oxygen gas, and a paper container capable of maintaining the quality of the contents can be obtained.

  According to the third aspect of the present invention, since the fine holes are engraved by the laser, the continuous production can be stably performed. Stable continuous production is possible without causing clogging of the micropores.

  According to claim 4 of the present invention, when the gas barrier layer is a polyester film having an inorganic oxide vapor deposition layer, when producing a paper container, there is no occurrence of pinholes at the time of sealing, and liquid leakage A paper container can be formed without worry. Moreover, by having an inorganic oxide vapor deposition layer, the barrier property of oxygen gas and water vapor | steam is provided, and the preservability of the content can be improved. In addition, the rigidity of the paper container can be improved to facilitate handling.

  According to Claim 5 of this invention, productivity can be improved because an inorganic oxide is a silicon oxide or a magnesium oxide. It is preferable also from a price side. In addition, it can be recycled even after disposal.

  According to the sixth aspect of the present invention, when the liquid paper container is a gable top type paper container or a flat top type paper container, a normal molding line of the paper container can be used. Moreover, in order to make it easy to pour the contents, a liquid paper container that can be reclosed and is easy to handle can be obtained by providing a stopper at the top. Further, the volume can be reduced at the time of disposal after use.

It is explanatory drawing which shows an example of the cross section of the blank for forming the liquid paper container of this invention. It is explanatory drawing which shows an example of the blank (surface is shown) for forming the liquid paper container of this invention. It is explanatory drawing which shows an example of the blank (the back surface is shown) for forming the liquid paper container of this invention. It is explanatory drawing which shows an example of the liquid paper container (gable top type) which assembled the blank of FIG. It is explanatory drawing which shows an example of the liquid paper container (gable top type) of FIG. It is explanatory drawing which shows an example of the liquid paper container (flat top type) of this invention. It is explanatory drawing which shows an example of the liquid paper container (flat top type) of FIG.

  Hereinafter, modes for carrying out the present invention will be described. A blank for producing a gable top type paper container will be described as an example.

FIG. 1 is an explanatory view showing an example of a cross section of a blank for forming the liquid paper container of the present invention. The laminate 1 constituting the blank is made of paper as a base material layer, and is composed of a thermal adhesive resin layer 3 / base material layer 4 / adhesive resin layer 5 / gas barrier layer 6 / adhesive layer 7 / sealant layer 8. The gas barrier layer 6 is made of a polyester film 10 having an inorganic oxide vapor deposition layer 9. The gas barrier layer 6 is provided with a large number of fine holes 20. The fine holes 20 are formed so as to penetrate the gas barrier layer 6, that is, the inorganic oxide deposition layer 9 and the polyester film 10. Moreover, when using pattern printing etc., the printing layer 2 can be provided on the surface of the thermoadhesive resin layer 3. That is, the laminated plate 1 has a printing layer 2 / thermal adhesive resin layer 3 / base material layer 4 / adhesive resin layer 5 / inorganic oxide vapor deposition layer 9 / polyester film 10 / adhesive layer 7 / sealant layer 8 sequentially laminated. The inorganic oxide vapor-deposited layer 9 and the polyester film 10 are made of a laminated plate 1 in which fine holes are formed.

  FIG. 2 is an explanatory view showing an example of a blank (showing the surface) for forming the liquid paper container of the present invention. The blank 30 shows the surface. It consists of a back panel 110, a left panel 120, a front panel 130, a right panel 140, and a back panel 150 through a vertical fold line a. Each panel has a body part through a lateral fold line b. C, a top portion B is formed at the upper portion of the body portion C, and a bottom portion D is formed at the lower portion. A folding line c is formed at the top of the left panel 120 and the right panel 140, and a top seal portion A is formed at the top of the top B, respectively. Further, a plug mounting hole 160 for mounting a plug is formed on the top B of the front panel 130.

  FIG. 3 is an explanatory view showing an example of a blank (showing the back surface) for forming the liquid paper container of the present invention. A blank 40 indicates the back surface. It is explanatory drawing which shows the area | region 200 (it shows with dot shape) in which the micropore of the gas barrier layer was engraved. The region 200 in which the fine holes are engraved is engraved on the entire blank. By setting the size of the micropores and the ratio of the total area of the micropores to the surface area of the blank, the barrier property of oxygen gas and water vapor can be selectively adjusted.

The area for engraving the fine holes can be determined in consideration of the amount of oxygen gas generated from the contents and the amount (permeability) of the oxygen gas permeating from the paper container. In other words, the paper container does not expand if the amount of the paper container that permeates from the paper container is equal to or greater than the amount generated. That range size of 0.001～10Mm ² of micropores, the ratio of the surface area of the total area and the blank of micropores may be in the range 0.01 to 50%.

  FIG. 4 is an explanatory view showing an example of a liquid paper container (gable top type) in which the blank of FIG. 2 is assembled. After sealing the outer surface of the blank back panel and the inner surface of the back panel to form a square cylindrical sleeve (not shown), seal the bottom D, fill the contents, and seal the top seal A The gable-top type liquid paper container 50 is sealed. In order to facilitate the pouring of the contents, a cap 170 is attached to the top B of the front panel. The liquid paper container of the present invention is a paper container that is rigid and easy to handle.

  FIG. 5 is an explanatory view showing an example of the liquid paper container (gable top type) of FIG. A region 200 (shown as a dot) in which fine holes are engraved in the paper container is shown. It is a paper container that allows oxygen gas generated from the contents to permeate appropriately and does not significantly change the water vapor permeability. Since the expansion of the paper container is suppressed and the stopper 170 is provided, the paper container is easy to pour.

  FIG. 6 is an explanatory view showing an example of the liquid paper container (flat top type) of the present invention. The liquid paper container of the present invention can be a flat-top liquid paper container.

  FIG. 7 is an explanatory view showing an example of the liquid paper container (flat top type) of FIG. A region 200 (shown as a dot) in which fine holes are engraved in the paper container is shown. Similar to the gable top type liquid paper container, oxygen gas generated from the contents is appropriately permeated to suppress the expansion of the paper container. Moreover, since it is provided with the stopper 170, it is a paper container that is easy to pour.

  Furthermore, the form for implementing this invention is demonstrated.

  The method of forming the fine holes 20 in the gas barrier layer is preferably a laser. Examples of lasers include carbon dioxide lasers, YAG lasers, and excimer lasers having a continuous or pulsed oscillation format. In the polyester film used for the laminated sheet of the liquid paper container of the present invention, the polyester film absorbs the laser. A carbon dioxide laser with a wavelength of 10.63 μm (infrared rays) is suitable. That is, a carbon dioxide laser is condensed by a condenser lens and irradiated from the back surface of the laminated plate. For example, when a polyester film having an inorganic oxide vapor deposition layer is used, fine holes are formed by laser from the polyester film side. A fine film is formed by penetrating a polyester film having an inorganic oxide vapor deposition layer.

The shape of the fine hole 20 can be continuously engraved in the vertical direction or the horizontal direction in a straight line shape or a dot shape. The line width to be engraved can also be set freely. In particular, the shape is not limited. The ratio of the pore size, the total area of the pores, and the surface area of the blank can be controlled by the permeability of oxygen gas and water vapor. The micropores preferably have a micropore size in the range of 0.01 to 10 mm ² and a ratio of the total area of the micropores to the surface area of the blank in the range of 0.01 to 50%. The permeability of oxygen gas and water vapor can be selectively adjusted.

If the size of the micropores is less than 0.01 mm ² and the ratio of the total area of the micropores to the surface area of the blank exceeds 50%, the paper container does not expand, but there is a problem of causing a change in the weight of the contents. is there. Further, when the size of the fine holes exceeds 10 mm ² and the ratio of the total area of the fine holes to the surface area of the blank is less than 0.01%, there is a problem that the permeability of oxygen gas is lowered and the paper container is expanded. Therefore, if the size of the fine holes is in the range of 0.01 to 10 mm ² and the ratio of the total area of the fine holes to the surface area of the blank is in the range of 0.01 to 50%, the transmission of oxygen gas and water vapor is selected. Can be adjusted. That is, the oxygen gas generated from the second agent can be transmitted through the paper container to suppress the expansion. Moreover, since the water vapor permeability does not change greatly, the quality can be maintained.

As the base material layer 4 used in the present invention, a paperboard having a basis weight of 200 to 500 g / m ² and a density of 0.6 to 1.1 g / cm ³ can be used. For example, milk base paper or cardboard can be used.

As the resin for forming the thermal bonding resin layer 3, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or the like can be used. These resins are extruded and laminated on the base material layer. The thickness of the heat bonding resin layer is preferably in the range of 15 to 30 μm.
Moreover, a printing layer can be provided on the surface of the heat bonding resin layer. Adhesion with the printing layer can be improved by corona treatment and ozone treatment of the surface of the thermal adhesive resin layer.

  As the adhesive resin layer 5, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), ethylene-methacrylic acid copolymer (EMAA), ethylene -Polyolefin resins such as ethyl acrylate copolymer (EAA), ionomer, and polypropylene can be used. These resins can be used by forming a film with an extruder. The thickness is preferably in the range of 10 to 30 μm.

  As the gas barrier layer 6, a film such as a polyester film having an inorganic oxide vapor deposition layer or a stretched polypropylene film can be used. The thickness of the film is preferably in the range of 6 to 25 μm.

As the inorganic oxide, inorganic oxides such as diatom oxide, aluminum oxide, magnesium oxide, calcium, potassium, tin, sodium, boron, titanium, lead, zirconium and yttrium can be used. Of these, silicon oxide and magnesium oxide are preferable in terms of productivity and price. The thickness of the inorganic compound deposition layer is preferably in the range of 5 to 300 nm, and more preferably in the range of 5 to 100 nm. The value may be selected as appropriate. Moreover, the direction of the vapor deposition layer in a laminated board may be either a base material layer side or a sealant layer side.

  Moreover, the film which bonded aluminum foil as a gas barrier layer can also be used. For example, a film such as a polyester film or a stretched polypropylene film can be used. The thickness of the film can be in the range of 6-25 μm, and the aluminum foil can be in the range of 5-15 μm. However, a paper container using an aluminum foil has a problem of an aluminum residue in a recycling process and a problem of an aluminum residue in incineration. It is preferable to use a film having an inorganic oxide vapor deposition layer.

  As the sealant layer 8, a resin such as low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE) is formed by an extruder and used. Can do. It may be a single layer or multiple layers. A linear low density polyethylene (LLDPE) resin is preferable. The thickness is preferably in the range of 30 to 100 μm.

  As the adhesive layer 7, a dry laminating method can be used using an adhesive. Examples of the adhesive include a polyurethane adhesive and a two-component curable adhesive made of an organic polyol and a polyfunctional polyisocyanate. For the liquid paper container, a two-component curable adhesive that does not easily reduce the adhesive strength due to the chemical components of the contents as well as excellent adhesive strength is mainly used. Moreover, you may bond together using an anchor coat agent (adhesive), extruding a sealant layer with an extruder.

  As a method of forming the printing layer 2, a commonly used printing method such as gravure printing, offset printing, flexographic printing, inkjet printing, silk screen printing, or the like can be used.

  Specific examples of the present invention will be described below.

A low density polyethylene resin was extruded and laminated on the surface of a paperboard having a basis weight of 320 g / m ² . A polyethylene film having a thickness of 20 μm was laminated.

  As the gas barrier layer, a polyester film 12 μm on which silicon oxide was deposited was used. The thickness of silicon oxide was 30 nm.

  As the sealant layer, a linear low density polyethylene resin was formed in advance with an extruder to prepare a linear low density polyethylene film of 60 μm.

  Next, the vapor-deposited surface of the gas barrier layer and the linear low-density polyethylene film 60 μm were bonded together by an adhesive to form a laminated film. As the adhesive, a polyurethane two-component curable adhesive was used.

Fine holes were cut from the polyester film side of the laminated film using a carbon dioxide laser. The fine holes were engraved so that the size of the fine holes was 7 mm ² and the ratio of the total area of the fine holes to the surface area of the blank was 33%. The fine holes were engraved so as to penetrate the polyester film and the inorganic oxide vapor deposition layer from the polyester film side and reach the surface of the sealant layer. An interior film having fine holes formed therein was formed.

  Next, the interior form was laminated on the back surface of the milk base paper via an ethylene-methacrylic acid copolymer (EMAA) resin. Under the present circumstances, ethylene-methacrylic acid copolymer (EMAA) resin was extruded with the extruder, and film thickness was 30 micrometers. A laminate was prepared as described above.

  Next, in order to form a gable top type paper container having an inner volume of 1000 ml and an 85 angle (interval of folding lines in the vertical direction) using the above laminate, a blank as shown in FIG. 2 was prepared. Using a Thomson punching die, bending lines, hole punches for plugging, and external punching were processed and created.

  Next, using the blank, the back panel and the back panel were sealed to form a square cylindrical sleeve. Next, the sleeve was placed on a filling machine, the bottom part was molded, the plug was attached, the contents were filled, and the top seal part was sealed to prepare a liquid paper container.

A liquid paper container was prepared in the same manner as in Example 1 except that the size of the fine holes of the interior film was 3 mm ² and the ratio of the total area of the fine holes to the surface area of the blank was 15%.

A liquid paper container was prepared in the same manner as in Example 1 except that the size of the fine holes in the interior film was 1 mm ² and the ratio of the total area of the fine holes to the surface area of the blank was 4%.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
A liquid paper container was prepared in the same manner as in Example 1 except that fine holes were not formed in the interior film.

  The prepared liquid paper container was evaluated by the following method.

<Filled contents>
Two hair coloring agents (hydrogen peroxide concentration: 6%).
Content: 1000ml.

  The liquid paper container was evaluated based on the expansion of the paper container and the weight change of the contents.

<Expandable>
Store the liquid paper container in 40 ℃ × 30% RH, constant temperature and humidity chamber for 6 months. The degree of expansion of the liquid paper container was confirmed, and 4 cm or less was determined as “◯”.

<Weight change>
Store the liquid paper container in 40 ℃ × 30% RH, constant temperature and humidity chamber for 6 months. A weight change rate of 3% or less of the contents was determined as “◯”.

  The evaluation results of Examples 1 to 3 and Comparative Example 1 are shown in Table 1.

また実施例１〜３、比較例１の内装フィルムを用いてガスバリア性の評価を行った。

Further, gas barrier properties were evaluated using the interior films of Examples 1 to 3 and Comparative Example 1.

The evaluation method measured oxygen permeability and water vapor permeability.
-Oxygen permeability used MOCON company OXTRAN-2 / 21. Measurement conditions were 20 ° C. and 60% RH.
-The water vapor transmission rate used the measuring apparatus, PERMATRAN-W3 / 33 of MOCON. Measurement conditions were 40 ° C. and 90% RH.

  The evaluation results of Examples 1 to 3 and Comparative Example 1 are shown in Table 2.

表１から、実施例１〜３ともに紙容器の膨張性および内容物の重量変化は良好であった。しかし、比較例１では微細孔が刻設されていないために、紙容器の膨張が観られた。

From Table 1, the expansion | swelling property of the paper container and the weight change of the content were favorable in Examples 1-3. However, in Comparative Example 1, since the fine holes were not engraved, the expansion of the paper container was observed.

  From Table 2, the expansibility of the paper container and the weight change of the contents were not observed in the ranges of oxygen permeability and water vapor permeability of Examples 1 to 3. In Comparative Example 1, the expansion of the paper container was observed. In the paper containers of Examples 1 to 3, both the oxygen permeability and the water vapor permeability were lowered, but it was found that the paper containers did not expand and the contents did not change in weight. It turned out to be a fully usable paper container.

  The liquid paper container of the present invention can be used for contents that generate gas. For example, it can also be used for contents that generate carbon dioxide gas other than oxygen gas.

DESCRIPTION OF SYMBOLS 1: Laminated board 2: Printing layer 3: Thermal adhesive resin layer 4: Base material layer 5: Adhesive resin layer 6: Gas barrier layer 7: Adhesive layer 8: Sealant layer 9: Inorganic oxide vapor deposition layer 10: Polyester film 20: Fine Hole 30: Blank (surface) for forming the liquid paper container of the present invention
40: Blank (back surface) for forming the liquid paper container of the present invention
50: Liquid paper container of the present invention (gable top type)
60: Liquid paper container of the present invention (flat top type)
110: back panel 120: left side panel 130: front panel 140: right side panel 150: back panel 160: hole for plug mounting 170: plug 200: area in which fine holes are engraved (shown in dotted form)
A: Top seal portion B: Top portion C: Body portion D: Bottom portion a: Vertical fold line b: Horizontal fold line c: Fold line

Claims (6)

A paperboard is used as a base material layer, and a blank made of a laminated board in which a thermal adhesive resin layer / base material layer / adhesive resin layer / gas barrier layer / adhesive layer / sealant layer is sequentially laminated, with the sealant layer as the inner surface, and the folding line is folded. A rectangular tubular liquid paper container,
A liquid paper container having a large number of fine holes formed only in the gas barrier layer. The size of the micropores is in the range of 0.01 to 10 mm ^2, the ratio of the surface area of the total area of the fine pores blank, characterized by comprising formed from the range of 0.01 to 50% The liquid paper container according to claim 1.   3. The liquid paper container according to claim 1, wherein the fine holes are engraved by a laser.   The liquid paper container according to claim 1, wherein the gas barrier layer is a polyester film having an inorganic oxide vapor deposition layer.   5. The liquid paper container according to claim 4, wherein the inorganic oxide is silicon oxide or magnesium oxide.   The liquid paper container according to claim 1, wherein the liquid paper container is a gable top type paper container or a flat top type paper container.

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