JP2016088525A - Packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging container capable of producing by a simplified method and having an odor transfer-preventing function to solve such problems that though the instances such that a container is made from three layers or more films, or a deodorant component is added to the container itself are reported to prevent the transfer of odor of food itself to the outside of the container or the odor transfer to other food, such films and the deodorant component are generally expensive and uneconomical.SOLUTION: A packaging container in this invention is characterized by providing an odor transfer preventing layer 3 for preventing the transfer of the odor in the environment to the content in the packaging container on the outside of a base material layer 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging container in which odors in the environment can be mixed into the contents through the packaging container and the quality deterioration of the contents can be suppressed.

  When a consumer opens a packaged food or cosmetic product, an unpleasant odor may be felt. The causes of off-flavors such as food are internal factors such as the deterioration of the food itself and the phenomenon of odor shifting from the packaging material, and external factors such as contamination of the contents and foreign odor components from the external environment. There are important factors. It is difficult for manufacturers to control the storage status after product shipment, and it is difficult to prevent odor transfer due to external factors. For example, because it has been stored in a storage warehouse for a long time, the odor generated in the warehouse has been transferred to the beverage through the container, and the fragrance component such as detergent has moved to the food that the consumer has stored in the kitchen at home. It has been reported (see Non-Patent Document 1).

If the packaging container can be provided with a function for preventing odor transfer, it is possible to reduce or avoid odor transfer due to external factors regardless of the storage environment, and to suppress deterioration in the quality of the contents.
As a method for preventing odor transfer in a packaging container, there is a method in which a laminate obtained by forming a metal foil or a metal deposition layer on a plastic film is formed into a container shape and used. As the metal, aluminum foil is generally used from the viewpoint of performance, cost, and workability. When it is desired to impart transparency to the packaging container, a film having a barrier property in which aluminum oxide or silicon oxide is vapor-deposited on polyester, ethylene-vinyl alcohol copolymer, polyprolene or the like is used. In addition, in order to prevent the odor of the food itself from moving outside the packaging container and the odor to other foods, cases have been reported in which the container is composed of a multilayer film or a deodorant component is added to the container itself. (See Patent Documents 1 and 2).
However, these films and deodorant components are generally expensive, and paper containers require lamination with metal foil or plastic film, which is not economical.

Japanese Patent No. 4258379 Japanese Patent Laid-Open No. 2006-62696

“Food Odor Complaints” Journal of Odor and Kaori Environmental Society, Vol. 41, No. 6, 2010

  Accordingly, an object of the present invention is to provide a packaging container that can be manufactured by a simplified method and has an excellent odor transfer preventing function.

The invention described in claim 1 is characterized in that an odor transfer prevention layer for preventing the odor in the environment from transferring to the contents in the packaging container is provided outside the base material layer of the packaging container. It is a packaging container.
The invention according to claim 2 is the packaging container according to claim 1, wherein the packaging container is a paper container, a plastic container, or a mixed container of paper and plastic.
The invention according to claim 3 is characterized in that the odor-transfer-preventing layer is formed by applying a coating agent containing at least a main component composed of a polyester polyol, a polyisocyanate curing agent, and a dispersion medium. Item 3. A packaging container according to item 1 or 2.

According to the present invention, the odor transfer prevention layer for preventing the odor in the environment from transferring to the contents in the packaging container is provided on the outer side of the base material layer of the packaging container. It is possible to provide a packaging container that can be manufactured by an improved method and has an excellent odor transfer preventing function.
As a material of the packaging container of the present invention, a paper container, a plastic container, a mixed container of paper and plastic, and the like are suitable, and an odor transfer preventing layer can be easily formed.
The odor transfer preventing layer is preferably formed by applying a coating agent containing at least a main component comprising a polyester polyol, a polyisocyanate curing agent, and a dispersion medium. According to this embodiment, the coating agent is applied to the outside, preferably part or all of the outermost layer of a packaging container such as a paper container, a plastic container, or a paper and plastic mixing container, and then dried. It can be formed by a simple method. As the coating method, a printing method, spray coating, dip coating, or the like can be adopted, which is economical. Moreover, with this form, it is possible to more satisfactorily prevent environmental odors from being transferred to the contents in the packaging container, and to prevent the contents from being altered.

It is sectional drawing for demonstrating one form of the packaging container of this invention. It is a top view for demonstrating the packaging container which is a form of a pouch. It is a perspective view for demonstrating the packaging container which is a form of a gable top.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view for explaining one embodiment of the packaging container of the present invention. As shown in FIG. 1, the packaging container of the present invention has a thermal adhesive layer 1, a base material layer 2, and an odor transfer preventing layer 3 in this order. The smell transfer preventing layer 3 is located outside the base material layer 2, that is, on the external environment side.

The base material layer 2 is a main layer of the packaging container, and a plastic film or paper is used. The plastic film is preferably a material having properties such as mechanical strength, tear properties, slip properties, heat resistance and printability, and polyester films such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; 6-nylon, 6, 6 -It is preferable to use a polyamide film such as a nylon film; or a polyolefin film such as a uniaxially or biaxially stretched film of a polypropylene film. A known additive such as an antistatic agent, a slip agent, an antifogging agent, or an ultraviolet absorber can be added to these base material layers as necessary. Moreover, a well-known process, for example, a corona discharge process, an ozone process, a flame process etc., can be performed as needed, and anchor coating agents, such as an isocyanate type compound, a polyethyleneimine, and a modified polybutadiene, can be apply | coated. When paper is used, a coated paper, which is generally called coated paper and is provided with printability by applying a white pigment to the surface of the paper, is used.
A printing layer is usually formed on the packaging container, but printing on the base material layer 2 or printing by separately preparing a base material for printing and laminating with the base material layer using an adhesive Is also possible.

The odor transfer preventing layer 3 is provided on the outer side of the base material layer 2 of the packaging container, preferably on a part or all of the surface of the outermost layer of the packaging container. For example, the main agent composed of at least a polyester polyol, a polyisocyanate curing agent, and a dispersion medium. It is preferable to form by coating a coating agent containing and drying.
As the polyester polyol, for example, one obtained by reacting at least one polybasic acid with at least one diol can be used.
Polybasic acids include succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, brassic acid and other aliphatic dibasic acids, isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid and other aromatics Group dibasic acid and the like.
Diols include ethylene glycol, propylene glycol, butanediol, neopentyl glycol, methylpentanediol, hexanediol, heptanediol, octanediol, nonanediol, decanediol, dodecanediol and other aliphatic diols, cyclohexanediol, hydrogenated xylylene Examples thereof include alicyclic diols such as lenglicol and aromatic diols such as xylylene glycol.
Examples of the polyisocyanate curing agent include 2,4- or 2,6-tolylene diisocyanate, xylylene diisocyanate, 4,4′-diphenylmethane diisocyanate, methylene diisocyanate, isopropylene diisocyanate, lysine diisocyanate, 2,2,4. -Or selected from 2,4,4-trimethylhexamethylene diisocyanate, 1,6-hexamethylene diisocyanate, methylcyclohexane diisocyanate, isophorone diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, isopropylidene dicyclohexyl-4,4'-diisocyanate, etc. Isocyanate compound alone or at least one isocyanate compound selected from the above isocyanate compounds. Adducts, biuret body, isocyanurate and the like.

The molecular weight of the polyester polyol is preferably not more than a certain value from the viewpoint of coating suitability. In order to enhance the effect of preventing odor transfer, it is desirable that the polyester polyol has a smaller molecular weight. Specifically, the molecular weight is 300 to 2000, and the molecular weight is particularly preferably 500 to 1000. By using such a polyester polyol, the crosslinking density of the polyol and isocyanate is increased, and the transmission of odorous components can be suppressed.
The ratio between the main agent and the curing agent is a molar ratio of the functional group (A) in the main agent to the reactive functional group (B) in the curing agent, and (B) / (A) is 0.5 or more and 5.0 or less. It is preferably 0.8 or more and 3.5 or less. If (B) / (A) is more than the said lower limit, a main ingredient can fully be hardened, and if it is below the said upper limit, blocking of an odor transfer prevention layer can be prevented.

The dispersion medium is a liquid that dissolves or disperses the main agent and the curing agent, and is not particularly limited as long as it can be dissolved and diluted. As the dispersion medium, an alcohol solvent, a ketone solvent, an ester solvent, a glycol solvent, or a hydrocarbon solvent can be used. Examples of alcohol solvents include methanol, ethanol, isopropanol, n-propanol, 1-butanol, and 2-butanol.
Examples of the ketone solvent include acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and isophorone.
Examples of the ester solvent include methyl acetate, ethyl acetate, n-propyl acetate, n-butyl acetate, isobutyl acetate, and propylene glycol monomethyl ether acetate.
Examples of glycol solvents include butyl cellosolve and propylene glycol monomethyl ether.
Examples of the hydrocarbon solvent include toluene, xylene, n-hexane, and methylcyclohexane. These solvents can be used alone or in a mixture containing two or more thereof. Methyl ethyl ketone and ethyl acetate are preferable from the viewpoint of stability during dissolution and drying after coating.
The solid content concentration of the coating agent is preferably 3 to 50% by mass, more preferably 4 to 40% by mass, and further preferably 5 to 30% by mass. If the solid content concentration of the coating agent is less than or equal to the lower limit, the coating amount is small and the effect cannot be obtained. On the other hand, if it is at least the upper limit value, the viscosity of the coating agent becomes high and becomes unsuitable for coating.

  In addition to the main agent, curing agent and dispersion medium, the coating agent includes an antioxidant, an ultraviolet absorber, a light stabilizer, a pigment, a dye, an antifoaming agent, a leveling agent, an antiblocking agent, etc. It may be added as long as the function is not lost.

  As a method for applying the odor transfer preventing layer 3, a method of printing the coating agent on the base material layer 2, for example, gravure printing, offset printing, flexographic printing, screen printing or the like can be used. Moreover, when apply | coating to a molded object, the dip coat method, the spray coat method, etc. can utilize suitably. In order to improve the adhesion between the base material layer 2 and the odor transfer prevention layer 3, an anchor coat layer is provided on the base material layer 2 as described above, and the odor transfer prevention layer is provided to impart resistance to scratching and rubbing. 3 can be provided with an overcoat layer.

  FIG. 2 is a plan view for explaining a packaging container in the form of a pouch. In FIG. 2, the pouch 4 has a seal portion 5 around it. In order to provide the thermal adhesiveness in the seal portion 5, as shown in FIG. 1, the thermal adhesive layer 1 may be provided as the innermost layer. As the resin having thermal adhesiveness, resins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene methacrylate, ionomer, and modified polyolefin can be used. In addition, as a method of laminating the thermal adhesive layer 1, a method of laminating directly on the base material layer 2 by an extrusion molding method, or a coating agent in which a resin having thermal adhesiveness is dissolved or dispersed in a solvent is applied and dried. There is a method of forming. Moreover, it is also possible to bond the resin film which has heat adhesiveness to the base material layer 2 using urethane or an epoxy-type adhesive agent.

FIG. 3 is a perspective view for explaining a packaging container in the form of a gable top.
The gable top 6 can be a paper container, a plastic container, a paper and plastic mixing container, or the like.
In addition, the packaging container of this invention does not restrict | limit the shape in particular.

  Hereinafter, although the packaging container of this invention is further demonstrated by an Example and a comparative example, this invention is not limited to these examples.

[Coating agent adjustment]
A mixture having the following composition was stirred and mixed to be uniform to prepare a coating agent.
Polyester polyol (main agent) 4.5 parts by mass (“Nipporan 800” manufactured by Nippon Polyurethane Industry Co., Ltd.)
15.5 parts by mass of polyisocyanate curing agent (“Takenate 160N” manufactured by Mitsui Chemicals, Inc.)
80.0 parts by mass of ethyl acetate At this time, the molar ratio of the reactive functional group (A) in the main agent to the reactive functional group (B) in the curing agent, (B) / (A) = 2.0, solid content The concentration was 16.1% by mass.

Example 1
As a base material layer, the coating agent prepared above was applied to a biaxially stretched polypropylene film having a thickness of 20 μm using wire bar # 8, dried at 80 ° C. for 1 minute, and then subjected to aging treatment at 40 ° C. for 5 days. An odor transfer prevention layer was formed. The coating thickness was about 1 μm. A low-density polyethylene having a thickness of 30 μm is bonded to the base layer side of the coated film using an adhesive to form a heat-adhesive layer, and the heat-adhesive layers are partially heat-sealed. A pouch having an inner surface of 10 cm x 10 cm as shown in Fig. 1 was prepared, and 30 g of tap water was added and sealed with a four-side seal.

(Example 2)
It was molded into a gable-top type container with a configuration of 15 μm low density polyethylene / 300 μm kraft paper / 40 μm low density polyethylene and a paper laminate. The low-density polyethylene of the outer layer was corona-treated in advance, and a polyester urethane anchor coating agent was applied. This laminate was filled with 70 mm (bottom length) × 70 mm (bottom width) × 194 mm (container depth) and 900 ml of tap water as the contents, and sealed. Then, it was immersed in the coating agent adjusted as described above, dried, and this was repeated 5 times, followed by aging treatment at 40 ° C. for 5 days to form an odor transfer preventing layer on the outermost layer of the container.

(Example 3)
A box-shaped paper container with a lid of 10 cm (bottom length) × 10 cm (bottom width) × 5 cm (container depth) was prepared using a coated paper having a basis weight of 260 g / m ² . The coating agent prepared above was sprayed evenly on the outer surface of the paper container by a spraying method on the molded paper container, and an aging treatment was performed at 40 ° C. for 5 days to form an odor transfer prevention layer. A polyethylene pouch having an inner diameter of 10 cm × 10 cm was filled with tap water and sealed, placed in a paper container, and the lid of the paper container was sealed with vinyl tape.

(Comparative Example 1)
A pouch was prepared in the same manner as in Example 1 except that the smell transfer preventing layer was not provided.

(Comparative Example 2)
A container was prepared in the same manner as in Example 2 except that the smell transfer preventing layer was not provided.

(Comparative Example 3)
A container was prepared in the same manner as in Example 3 except that the smell transfer preventing layer was not provided.

[Experiment 1]
A plastic case of a width 40 cm × depth 20 cm × height 20 cm was prepared, and five insect repellents (one 7 g) mainly composed of camphor were placed inside to fill the odor component. The containers of Examples 1 to 3 and Comparative Examples 1 to 3 were put in the plastic case, the plastic case was sealed, and left at room temperature overnight.

[Experiment 2]
As in Experiment 1, about 15 g of methyl salicylate is contained in cotton and placed in a plastic case. The containers of Examples 1 to 3 and Comparative Examples 1 to 3 are placed and the plastic case is sealed. Left overnight.

〔Evaluation method〕
Each container obtained in Experiments 1 and 2 was opened, and water was sampled for sensory evaluation. Further, the water component was qualitatively analyzed by gas chromatography. The results are shown in Table 1.

  In Table 1, ○ indicates that the water does not smell; × means that the water feels odor.

  According to gas chromatography analysis, in Comparative Examples 1 to 3, camphor was detected when stored with an insect repellent, and methyl salicylate was detected when stored with methyl salicylate. In Examples 1 to 3, all were below the detection limit.

  It was found that the packaging container having the odor-transfer-preventing layer of the present invention can maintain the quality of the contents without being transferred to the contents even when stored together with the odor components. If the method for forming the odor-transfer-preventing layer is a solution coating method, the coating amount can be easily adjusted and can be manufactured at low cost.

DESCRIPTION OF SYMBOLS 1 Thermal-adhesion layer 2 Base material layer 3 Odor transfer prevention layer 4 Pouch which has an odor transfer prevention layer 5 Seal part 6 Beverage container which has an odor transfer prevention layer

Claims (3)

  A packaging container comprising an odor-transfer-preventing layer for preventing an odor in the environment from being transferred to the contents in the packaging container on the outside of the base material layer of the packaging container.   The packaging container according to claim 1, wherein the packaging container is a paper container, a plastic container, or a mixed container of paper and plastic.   The packaging container according to claim 1 or 2, wherein the odor transfer preventing layer is formed by applying a coating agent containing at least a main component composed of polyester polyol, a polyisocyanate curing agent, and a dispersion medium. .

Images