JP2015221680A - Packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging container in which deformation does not occur in a lid material even when the air pressure in the packaging container becomes lower than the air pressure in an exterior part.SOLUTION: A packaging container 1 comprises: a container body 8; and a lid material 2 which seals the container body 8. The lid material 2 is formed by laminating an outer lid 3 on a flange part 6 of the container body 8 and an inner lid 4 having sealability through an easily peelable adhesion layer 22. The easily peelable adhesion layer 22 is formed in a portion that corresponds to the flange part 6. Further, a through hole 7 which penetrates through the outer lid 3 is formed at an area of the outer lid 3 which is located at the inner side relative to the flange part 6.

Description

  The present invention relates to a packaging container including a container body that contains beverages, foods, and the like, and a lid that seals the container body.

  2. Description of the Related Art Conventionally, many packaging containers for storing contents such as beverages and foods are used in which a lid material is sealed and sealed to a flange portion of a container body. If the container is peeled off when eating or drinking, if the handling is wrong, the contents may spill out and the hands and clothes may be soiled.

  In order to improve these, there is a lid member in which a partial opening as a drinking mouth or a spout is formed. For example, a lid material in which an outer lid and an inner lid are bonded to each other via an easily peelable adhesive layer is sealed to the flange portion of the container body. When eating or drinking, after removing the outer lid from the inner lid, the inner lid is separated. It is pierced with a body straw to form a partial opening and drink.

  In addition, there is a type in which a hole serving as a drinking mouth or a spout is provided in the inner lid in advance and the hole is bonded to the outer lid via an easily peelable adhesive layer. After the outer lid is peeled off from the inner lid, a drinking mouth and a spout are formed on the inner lid (Patent Document 1, Patent Document 2).

  Some of these packaging containers are hot-filled with contents in order to maintain the quality of taste and fragrance. For example, there are beverages such as coffee, tea, and tea. When the contents cool down, the pressure inside the container becomes lower than the outside pressure, so that the container body is rigid, and plastic containers, glass containers, paper containers combined with plastic films, etc. are used. ing. However, since the lid member is made of a material having high flexibility, there is a problem that the lid member is drawn into the container and deformed. That is, the lid member is recessed into the container. The appearance of the packaging container may deteriorate, and at the same time, a part of the outer lid and the inner lid may peel off. If it becomes such a state, it will become a serious defect as a cover material.

  An example of such a packaging container 30 will be described with reference to FIGS. 6, 7, and 8. FIG. 6 is an explanatory view showing a plane of a conventional packaging container 30. The lid member 40 is formed to be approximately the same as the shape of the opening of the container body, the knob 5 protruding outward is formed on the outer peripheral edge, and sealed by the flange portion 6 of the container body to seal the container body. . A peeling half-cut 41 penetrating the inner lid is formed at the base of the knob 5 in order to peel the outer lid and the inner lid. This plan view shows the outer shape of the outer lid 3.

  FIG. 7 is an explanatory view showing a cross section taken along line MM ′ of the packaging container of FIG. 6. The outer lid 3 and the inner lid 4 shown in FIG. 7A are formed by being bonded via an easily peelable adhesive layer 22, and the inner lid is sealed by the flange portion 6 of the container body 8, and the container body 8 is sealed. It shows the state. 7-2 is explanatory drawing which shows an example of the state which the atmospheric | air pressure in the packaging container of FIGS. 7-1 fell from the external atmospheric | air pressure. The lid member shows a state 11 that is drawn into the container and recessed. Since the outer lid 3 and the inner lid 4 of the lid are integrated, they are drawn into the container and deformed in this state. A so-called depressed state 11 is obtained. A symbol B indicates a direction in which the wire is drawn. However, since the outer lid 3 that protects the inner lid 4 is more rigid than the inner lid, a repulsive force that tries to return to the outside acts, and if this state continues for a long time, a load is applied to the easily peelable adhesive layer 22. As a result, a part of the outer lid 3 and the inner lid 4 are peeled off, resulting in a peeling portion 12. As shown in FIG. 7-2, the peeling portion 12 is generated. Symbol C indicates the direction of repulsion.

Moreover, FIG. 8 is explanatory drawing which shows an example of the other conventional packaging container. As shown in FIG. 8A, the outer lid 3 and the inner lid 4 are bonded to each other through an easily peelable adhesive layer 22 at a portion corresponding to the flange portion 6. The inner lid 4 is sealed and sealed by the flange portion 6 of the container body 8. 8-2 is explanatory drawing which shows an example of the state which the air pressure in the packaging container of FIG. 8-1 fell from the external air pressure. The outer lid 3 and the inner lid 4 are both drawn into the container and deformed into a depressed state 11. A symbol B indicates a direction in which the wire is drawn. However, since the outer lid 3 that protects the inner lid 4 is more rigid than the inner lid, a repulsive force that tries to return to the outside works, and if this state continues for a long time, the easily peelable adhesive layer A load is applied, and a part of the outer lid 3 and the inner lid 4 are peeled off, resulting in a peeling portion 12. As shown in FIG. 8B, the peeling portion 12 is generated. Symbol C indicates the direction of repulsion.

Japanese Utility Model Publication No. 61-3810 Japanese Patent Laid-Open No. 2003-237811

  In view of the above problems, an object of the present invention is to provide a packaging container in which the lid member is not deformed even when the atmospheric pressure in the packaging container is lower than the external atmospheric pressure.

  In order to solve the above-mentioned problems, the inventors have conducted intensive studies and completed the present invention.

The invention according to claim 1 of the present invention is a packaging container comprising a container body and a lid member for sealing the container body,
The lid material is formed by laminating an outer lid, a flange portion of the container body, and an inner lid having a sealing property via an easily peelable adhesive layer,
The easily peelable adhesive layer is formed on a portion corresponding to the flange portion,
And the through-hole which penetrates the said outer cover is formed in the area | region inside the said flange part of the said outer cover, It is a packaging container characterized by the above-mentioned.

  The invention according to claim 2 of the present invention is the packaging container according to claim 1, wherein the outer lid has a knob portion protruding from an outer peripheral edge.

  The invention according to claim 3 of the present invention is the packaging container according to claim 1 or 2, wherein the inner lid is laminated with a film having gas barrier properties.

  In the packaging container of the present invention, even if the atmospheric pressure in the container is lower than the external atmospheric pressure, the lid material is not deformed and the outer lid and the inner lid are not peeled off.

  In the packaging container of the present invention, the lid material is formed by laminating the outer lid, the flange portion of the container main body, and the inner lid having a sealing property via the easy-peeling adhesive layer, and the easy-peeling adhesive layer is the flange part. Even if the atmospheric pressure in the container is lower than the external atmospheric pressure by forming a through-hole penetrating the outer lid in the inner region from the flange portion of the outer lid, The outer lid is drawn into the container and is not deformed and recessed, so that it looks good. Further, the outer lid and the inner lid are not peeled off.

The outer lid and the inner lid are laminated in a double structure through an easily peelable adhesive layer at the portion corresponding to the flange portion, and the outer lid has a through hole in the inner region from the flange portion. In addition, even if the atmospheric pressure in the container is lower than the external atmospheric pressure, air enters the space between the outer lid and the inner lid from the outside through the through hole, and creates a buffer part having the same atmospheric pressure as the outside. It will not be pulled in and will not be deformed.

  In addition, since the outer lid has a knob that protrudes from the outer peripheral edge, the outer lid can be easily peeled off from the inner lid by picking the knob.

  In addition, since the inner lid is laminated with a film having gas barrier properties, the oxygen gas barrier property and water vapor barrier property of the packaging container can be improved, and the quality storage period of the contents can be extended.

It is explanatory drawing which shows an example of the packaging container of this invention. It is explanatory drawing which shows the cross section of the LL 'line of the packaging container of FIGS. 1-2. It is explanatory drawing which shows an example in the state where the atmospheric | air pressure in the packaging container of FIG. 2 fell from the external atmospheric pressure. It is explanatory drawing which shows a cross section when the outer cover of the packaging container of FIG. 3 is opened. It is explanatory drawing which shows an example of the laminated constitution of the cover material of this invention. It is explanatory drawing which shows an example of the conventional packaging container. It is explanatory drawing which shows the cross section of the MM 'line of the packaging container of FIG. It is explanatory drawing which shows an example of the other conventional packaging container.

  Hereinafter, embodiments for carrying out the present invention will be described.

  FIG. 1 is an explanatory view showing an example of the packaging container of the present invention. FIG. 1-1 is an explanatory diagram showing a plane of the packaging container 1. The lid member 2 is formed substantially the same as the shape of the opening of the container body, and is sealed by the flange portion 6 of the container body to form the packaging container 1. This plan view shows the outer shape of the outer lid 3. A through hole 7 is formed in the outer lid 3 in a region inside the flange portion 6. An example in which three through holes 7 are formed is shown. 1-2, the lid 2 is formed to be substantially the same as the shape of the opening of the container body, the knob 5 protruding outward is formed on the outer peripheral edge, and sealed with the flange 6 of the container body. A container 1 is formed. A through hole 7 is formed in the outer lid 3 in a region inside the flange portion 6. An example in which three through holes 7 are formed is shown.

  FIG. 2 is an explanatory view showing a cross section taken along line LL ′ of the packaging container of FIG. 1-2. In the lid member 2, the outer lid 3 and the inner lid 4 are formed through an easily peelable adhesive layer 22 formed in a portion corresponding to the flange portion, and the inner lid is sealed by the flange portion 6 to seal the container body 8. ing. The lid member 2 has a double structure of an outer lid 3 and an inner lid 4. The inner lid 4 is punched out to be slightly larger than the outer peripheral edge of the flange portion 6 of the container body 8 and is sealed by the flange portion 6 to seal the container body 8. Further, the outer lid 3 protects the inner lid 4 and is formed to have a knob 5 equivalent to or slightly larger than the inner lid 4. It is bonded to the inner lid via an easily peelable adhesive layer 22 formed in a portion corresponding to the flange portion on the back surface of the outer lid. The knob 5 is formed by the outer lid 3. Further, the outer lid 3 is formed with a through hole 7 penetrating the outer lid in an inner region from the flange portion.

FIG. 3 is an explanatory diagram showing an example of a state where the air pressure in the packaging container of FIG. 2 is lower than the external air pressure. When the atmospheric pressure in the packaging container drops below the external atmospheric pressure, the inner lid 4 is drawn into the container and becomes deformed and recessed 11, but the outer lid 3 has air through the through-hole 7 from the outside and the inner lid. A state is shown in which the buffer portion 10 is formed between the lid and the same atmospheric pressure as the outside, and is pulled inward and is not deformed. Reference symbol A indicates the inflow direction of air. The lid | cover material 2 has a good appearance without a deformation | transformation. Further, no load is applied to the easily peelable adhesive layer 22 formed in the portion corresponding to the flange portion, and the outer lid 3 and the inner lid 4 are not peeled off.

  4 is an explanatory view showing a cross section when the outer lid of the packaging container of FIG. 3 is opened. The knob is picked and pulled in the opening direction, and the outer lid 3 is peeled off from the inner lid 4 to expose the inner lid 3. A packaging container sealed with an inner lid. For example, the inner lid 4 can be pierced with a straw or the like to form a partial opening such as a drinking mouth or a spout for eating and drinking.

  Furthermore, the form for implementing this invention is demonstrated in detail.

  FIG. 5 is an explanatory diagram illustrating an example of a layer structure of the lid member. As shown in FIG. 5A, the lid 1 is formed by laminating an outer lid 3 and an inner lid 4 with an easily peelable adhesive layer 22 interposed therebetween. Usually, the printed layer 21 is formed on the back surface or the front surface of the outer lid 3 and used. For example, the layer structure is comprised of outer lid 3 / printing layer 21 / easily peelable adhesive layer 22 / inner lid 4. FIG. 5B shows an example of the layer structure of the inner lid 4 in which the gas barrier layer 24 is laminated on the sealant layer 23. The gas barrier layer 24 / adhesive layer 25 / sealant layer 23 has a layer structure. The gas barrier property of the packaging container can be improved.

  The outer lid 3 is used to protect the inner lid. For example, a polyester film (PET), a polyethylene film (PE), a polypropylene film (PP), a nylon film (ONy), a polystyrene film (PS), Examples include polycarbonate film (PC), polyacrylonitrile film (PAN), polyimide film (PI), polyvinyl alcohol film (PVA), and polyvinylidene chloride film (PVDC). These films can be used alone or in combination. There is no particular limitation as long as it has mechanical strength and dimensional stability. A biaxially stretched film is particularly preferable. The thickness of the film constituting the outer lid is preferably in the range of 10 to 100 μm and more preferably in the range of 10 to 50 μm in consideration of workability. Moreover, aluminum foil can also be laminated | stacked on these films, and cosmetics and rigidity can further be provided.

  As the inner lid 4, a sealant layer having a sealing property or a laminate film having the sealant layer as an innermost layer can be used. For example, when a polyethylene film is used for the sealant layer, a layer structure of polyester film / polyethylene film, polyester film / nylon film / polyethylene film, nylon film / polyethylene film, or the like can be used. A gas barrier layer can be laminated on the sealant layer. As the gas barrier layer, an ethylene-vinyl alcohol copolymer film (EVOH film), an aluminum foil, a film on which an inorganic oxide is deposited can be used. When aluminum foil is used, layer formation of aluminum foil / polyethylene film, polyester film / aluminum foil / polyethylene film, or the like can be used. In addition to improving the piercing property such as a straw, a light shielding property and a barrier property can be imparted.

  Examples of inorganic oxides include metal oxides such as silicon oxide, aluminum oxide oxide, magnesium oxide, calcium oxide, potassium oxide, tin oxide, sodium oxide, boron oxide, titanium oxide, lead oxide, zirconium oxide, and yttrium oxide. Can be used. Of these, silicon oxide, aluminum oxide, magnesium oxide and the like are preferable from the viewpoint of productivity and price.

  Moreover, when laminating | stacking the film in which aluminum foil and an inorganic oxide were vapor-deposited, a sealant layer can be extruded and laminated to these materials, or it can laminate by the sand polyethylene method. Moreover, it is possible by a dry laminating method using an adhesive for dry laminating. As the adhesive, it is possible to use a two-component curable urethane adhesive.

  As the easily peelable adhesive layer 22, the outer lid and the inner lid can be bonded to maintain the adhesiveness even during distribution and storage, and when eating or drinking, the outer lid can be easily peeled off from the inner lid, that is, an easy peel property It is what has. The characteristics of the easily peelable resin are not particularly limited, and any of a cohesive peel type and an interfacial peel type may be used. For example, a cohesive failure type obtained by blending low density polyethylene resin with polypropylene or polybutene-1 which causes cohesive failure, an interfacial exfoliation type in which the mixing ratio of ethylene acetate / vinyl acetate copolymer resin is increased, etc. . Which type is selected may be selected from the layer structure of the laminated sheet.

  In addition, as a method of forming an easily peelable adhesive layer, these resins are dissolved by heat and applied in a predetermined shape by hot melt processing, or these resins are dissolved in a solvent to form a coating solution, It is possible by a method such as application to a predetermined shape. What is necessary is just to set as thickness of an easily peelable adhesive layer so that it may have the adhesive strength outstanding at the time of distribution | circulation and storage, and may show easy peelability at the time of eating and drinking. By applying a pattern to a portion corresponding to the flange portion on the back surface of the outer lid, the outer lid and the inner lid are integrated, and a dual-structure lid member can be formed.

  As the sealant layer 23, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), ethylene-methacrylic acid copolymer (EMAA), ethylene- A film made of a polyolefin resin such as ethyl acrylate copolymer (EAA), ethylene-vinyl acetate copolymer (EVA), ionomer, polypropylene (PP) can be used. These resins can be used by forming a film with an extruder. A single layer or a multilayer of two or more layers can be used using the above resin. The film thickness is preferably in the range of 10 to 100 μm, more preferably in the range of 15 to 70 μm.

  A printing layer can be appropriately provided on the film used for the outer lid as necessary. The printing layer 21 is a layer formed of a solvent, an ink obtained by adding a urethane, acrylic, nitrocellulose, rubber, or other binder resin, various pigments, a plasticizer, a desiccant, a stabilizer, and the like. is there. Characters, designs, etc. can be formed by this print layer. As the printing method, for example, known printing methods such as offset printing, gravure printing, flexographic printing, silk screen printing, and ink jet printing can be used. Moreover, the adhesiveness of a printing layer can be improved by giving the corona treatment or the ozone treatment to the surface which prints a film previously. It is preferable to provide a printing layer avoiding the through holes.

  Further, if it is necessary to improve the rigidity of the outer lid, a nylon film or a polyester film can be laminated. As a lamination method, for example, a two-component curable urethane adhesive can be used and a dry lamination method can be used.

  As a method for forming the through hole 7, a method using a Thomson blade or a method using a laser is possible. As the type of laser, a carbon dioxide laser is preferable. Further, the through hole preferably has a through hole diameter φ of 0.3 mm or less, and may be a through scratch as long as air can enter from the outside. Further, the through-hole may be any as long as it is difficult for dust or dust to enter from the outside and does not adversely affect the design of printed pictures and characters.

  Examples of the container body 8 include a paper cup and tray using a paper-based material on which a gas barrier layer is laminated, a plastic cup and tray on which a gas barrier layer is laminated, a glass container, a metal container, and the like.

The packaging container of the present invention does not deform even when the atmospheric pressure inside the container is lower than the external atmospheric pressure, and has a good appearance. Further, the outer lid and the inner lid are not peeled off.

  Hereinafter, specific examples of the present invention will be described.

  A paper cup was prepared using a laminate composed of polyethylene film / paper / aluminum foil / polyester film / polyethylene film as the container body. A paper cup having a top diameter of 70.5 mm, a bottom diameter of 54.5 mm, and a height of 85.5 mm was prepared.

  Next, 7 μm of aluminum foil and 20 μm of low-density polyethylene film were bonded as an inner lid material by a dry laminating method through a two-component curable urethane adhesive.

  Next, the low-density polyethylene film surface of the inner lid member was sealed to the flange portion of the paper cup under the conditions of 180 ° C., 1 second, and 150 kPa. At this time, 170 ml of hot coffee was filled and sealed.

  Next, a paper cup was produced by punching 1.5 mm outside the outer peripheral edge of the flange portion and sealing the inner lid. The punching was performed with a punching machine using a Thomson blade.

  Next, as an outer lid material, a polyester film 12 μm and a nylon film 15 μm were bonded together by a dry laminating method through a two-component curable urethane adhesive.

  Next, the outer lid member was formed with three through holes having a diameter φ of 0.2 mm as shown in FIG. The through hole was formed by a carbon dioxide laser.

  Next, a mixture of a polyethylene resin and an ethylene-methacrylic acid copolymer resin, which is an easily peelable adhesive resin, was thermally melted and applied to the surface of the nylon film by hot melt processing. At this time, it was applied to a portion facing the flange portion. The thickness of the easily peelable adhesive layer was 8 μm. An outer lid was made.

  Next, the outer lid member was bonded to the outer surface of the inner lid under the conditions of 140 ° C., 1 second, and 100 kPa, thereby creating a paper cup in which the outer lid member and the inner lid were integrated at a portion corresponding to the flange portion. At this time, the outer lid member was punched 5 mm outside the outer peripheral edge of the inner lid to form a protruding portion of about 15 mm as a knob. The punching was performed with a punching machine using a Thomson blade. A paper cup container in which the outer lid and the inner lid were integrated at a portion corresponding to the flange portion and a knob portion was formed on the outer lid was produced.

  A paper cup container was prepared in the same manner as in Example 1 except that the diameter φ of the through hole was 0.3 mm.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
A paper cup container was prepared in the same manner as in Example 1 except that no through hole was formed.

<Evaluation method>
Thirty paper cup containers were prepared and stored for 7 days at a room temperature of 20 ° C.
-The presence or absence of deformation of the lid material (outer lid) when pulled into the container was evaluated. A circle in which no deformation was observed was marked as ◯, and a circle was marked if even one in 30 was observed.
-The presence or absence of the peeled part of the outer lid and the inner lid was evaluated. The outer lid was peeled from the inner lid, and the presence or absence of a peeled portion between the outer lid and the inner lid was evaluated. The case where the part peeled off in 30 pieces was not seen was marked with ◯, and if one of the 30 pieces was seen, it was marked with x.

  The evaluation results are shown in Table 1.

＜評価結果＞
実施例１〜２では、蓋材（外蓋）が容器内へ引き込まれて変形することは観られなかった。また、外蓋と内蓋の剥がれ部分は、観られなかった。また、ストローによる突き刺し性も良かった。比較例１では、蓋材（外蓋）が容器内へ引き込まれて変形することが３０個中３０個観られた。また、外蓋と内蓋の剥がれ部分が観られる容器が、３０個中６個観られた。

<Evaluation results>
In Examples 1-2, it was not observed that the lid member (outer lid) was drawn into the container and deformed. Moreover, the peeling part of the outer lid and the inner lid was not observed. Moreover, the piercing property with a straw was also good. In Comparative Example 1, 30 out of 30 cases were observed in which the lid member (outer lid) was drawn into the container and deformed. In addition, 6 out of 30 containers were observed where the peeled portions of the outer lid and the inner lid were observed.

  The packaging container of the present invention has good appearance without deformation of the lid even when the atmospheric pressure in the packaging container is lower than the external atmospheric pressure. In particular, it can be used for beverages that are hot-filled such as coffee, tea, and tea, and foods that require an oxygen scavenger.

DESCRIPTION OF SYMBOLS 1 Packaging container 2 Cover material 3 Outer cover 4 Inner cover 5 Knob part 6 Flange part 7 Through-hole 8 Container body 10 Buffer part 11 Recessed state 12 Peeling part 21 Print layer 22 Easy peelable adhesive layer 23 Sealant layer 24 Gas barrier Layer 25 Adhesive layer 30 Conventional packaging container 40 Conventional lid material 41 Peeling half cut A Air inflow direction B Retraction direction C Repulsive force

Claims (3)

A packaging container comprising a container body and a lid for sealing the container body,
The lid material is formed by laminating an outer lid, a flange portion of the container body, and an inner lid having a sealing property via an easily peelable adhesive layer,
The easily peelable adhesive layer is formed on a portion corresponding to the flange portion,
And the through-hole which penetrates the said outer cover is formed in the area | region inside the said flange part of the said outer cover, The packaging container characterized by the above-mentioned.   The packaging container according to claim 1, wherein the outer lid has a knob that protrudes to an outer peripheral edge.   The packaging container according to claim 1 or 2, wherein the inner lid is laminated with a film having gas barrier properties.

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