JP2015209215A - Container for sealing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container for sealing, which enables a drinking straw to easily pierce through a lid body and which can be heated in a microwave oven.SOLUTION: A container 1 for sealing has a lid body 6, the opening 2 of which is sealed and which is opened by a drinking straw. The lid body 6 comprises a first base material layer 9 in which a fragile part 8 for being pierced by the drinking straw is formed, a second base material layer 10 which is superposed on a surface on one side of the first base material layer 9 via an adhesive 11 and made of a polyester resin film, and a seal layer 12 which is formed on a surface, on the other side of the first base material layer 9, of the second base material layer 10.

Description

  The present invention relates to a sealing container having a lid that seals an opening and is opened by a straw.

  An example of a lid used for this type of container is described in Patent Document 1. The lid includes a plastic film base material layer in which a cut portion is formed and an easy peel layer to be bonded to the opening of the container, and these layers are laminated through an adhesive. The cut portion is for easily inserting a straw into the lid, and is formed by irradiating the lid of the above configuration with laser light from the plastic film substrate layer side.

  Patent Document 2 describes a method for producing a laminated film that can be easily pierced by a straw. The laminated film includes a first laminated film in which an opening for inserting a straw is formed and a second laminated film having heat sealability, and the laminated film is an extrusion lamination method through a molten polyolefin resin. Are stacked. The first laminated film is formed by laminating a stretched plastic film and a polyolefin-based plastic film by a dry laminating method, and laminating a metal foil and a polyolefin-based heat-sealable plastic film by the same method as above. The second laminated film is configured.

JP 7-61469 A JP 59-178247 A

  In the configuration described in Patent Document 1, if the thickness of the plastic film base layer changes due to manufacturing variations, if the laser output or the amount of light is constant, depending on the thickness of the plastic film base layer There is a possibility that the depth of the cut portion changes. For example, when the actual thickness of the plastic film substrate layer is thinner than the design value, the cut portion is formed up to the easy peel layer, and the cut portion is easily damaged. On the other hand, when the actual thickness of the plastic film base layer is thicker than the above-described design value, the depth of the cut portion becomes shallow and it becomes difficult to pierce the straw.

  Moreover, in the structure described in patent document 2, since a 2nd laminated film is bonded together to the 1st laminated film which formed the opening part previously, an opening part can be formed only in a 1st laminated film. However, since the above bonding is performed by an extrusion laminating method, there is a possibility that the melted polyolefin-based resin enters the opening and the opening is blocked. In that case, there is a possibility that it is difficult to pierce the straw into the lid constituted by the laminated film having the above configuration. In addition, the heat-sealable plastic film of the second laminated film may be deteriorated and discolored by the heat at the time of bonding, or the lid body may be distorted by bending. As a result, the heat sealability of the lid may deteriorate and the container cannot be sealed. Furthermore, since the 2nd laminated | multilayer film has metal foil, the contents with which the said lid | cover was filled with the container cannot be heated with a microwave oven.

  This invention was made paying attention to said technical subject, Comprising: It aims at providing the container for sealing which can stab a straw easily in a cover body, and can be heated with a microwave oven. Is.

  In order to achieve the above object, the invention of claim 1 is a sealing container having a lid that seals an opening and is opened by a straw, wherein the lid is a fragile portion for piercing the straw. A first base material layer on which is formed, a second base material layer that is laminated on one surface of the first base material layer via an adhesive and is constituted by a polyester resin film, and the second base layer And a sealing layer formed on a surface of the material layer opposite to the first base material layer and closely attached to the opening.

  According to a second aspect of the present invention, in the sealing container according to the first aspect, the sealing layer is a coating film of a synthetic resin material having thermoplasticity.

  According to a third aspect of the present invention, in the sealing container according to the first or second aspect, the first base material layer is provided with a heating element layer that generates heat upon irradiation with electromagnetic waves, and the heat generated by the heating element layer. The sealing container is configured so as to soften the sealing layer.

  According to a fourth aspect of the present invention, in the sealing container according to any one of the first to third aspects, the fragile portion is formed by a through-hole penetrating the first base material layer, and the adhesive is placed in the through-hole. Is a container for sealing.

  According to a fifth aspect of the present invention, in the method of manufacturing a sealing container having a lid that seals an opening and is opened by a straw, the lid includes a first base material layer and a first base material layer. A second base material layer laminated on one surface with an adhesive and made of a polyester resin film, and formed on the surface of the second base material layer opposite to the first base material layer. A first step of forming a fragile portion for piercing the straw in the first base material layer, and the first base material layer in the second base material layer. A second step of forming the adhesive layer on the side surface and forming the sealing layer on the surface of the second base material layer opposite to the first base material layer; A third step of bonding the one base material layer and the second base material layer through the adhesive; and Is a manufacturing method characterized by a subsequent second base layer and said opening and a fourth step of bonding via the seal layer.

  According to a sixth aspect of the present invention, in the manufacturing method of the fifth aspect, the sealing layer is formed by coating a synthetic resin material having thermoplasticity on one side of the second base material layer. It is a manufacturing method of the container for use.

  According to invention of Claim 1, since a weak part is formed only in the 1st base material layer, the 2nd base material layer can maintain the intensity | strength. Therefore, it is possible to easily pierce the straw and obtain a lid body having the desired strength. Moreover, the 2nd base material layer is comprised by the polyester-type resin film which has the heat resistance superior to the polyolefin-type resin film. Therefore, the second base material layer deteriorates due to heat and is unlikely to discolor or bend. That is, the thermal deformation of the lid body can be suppressed.

  According to the invention of claim 2, in addition to the effect similar to the effect of the invention of claim 1, since the seal layer is a coating film of a synthetic resin material having thermoplasticity, when the seal layer is constituted by a film, In comparison, the thickness can be reduced. Thereby, the thickness of the whole cover body can be made thin and the openability by a straw can be improved.

  According to the invention of claim 3, in addition to the effect similar to the effect of the invention of claim 1 or 2, a heating element that generates heat by receiving electromagnetic waves is provided, and the seal layer is formed by the heat generated by the heating element. It is designed to soften. When the sealing layer is softened, the adhesive strength is reduced, and thus the lid can be easily peeled from the opening. For example, the sealing container filled with the contents by a microwave oven can be heated together with the lid, and then the heated contents can be taken out by peeling off the lid from the opening.

  According to the invention of claim 4, in addition to the same effect as that of any one of the inventions of claims 1 to 3, the adhesive penetrates into the through hole serving as the fragile portion. The adhesion between the layer and the second substrate layer is improved. In addition, by suppressing the so-called elongation of the first base material layer and the second base material layer around the through hole, it is possible to improve the unsealing property by the straw.

  According to invention of Claim 5, in order to laminate | stack a 2nd base material layer on the 1st base material layer which formed the weak part, after forming each base material layer, a weak part is formed in a 1st base material layer. Compared to the case, the fragile portion can be formed only in the first base material layer. Further, the strength of the second base material layer can be maintained. Therefore, it is possible to easily pierce the straw and obtain a lid body having the desired strength. Moreover, since said 2nd base material layer is comprised with the polyester-type resin film, it can suppress that a 2nd base material layer discolors or bends with a heat | fever. That is, the change by the heat | fever of said cover body can be suppressed.

  According to the invention of claim 6, in addition to the same effect as that of the invention of claim 5, since the seal layer is a coating film, the seal layer and the lid body are compared with the case where the seal layer is constituted by a film. The overall thickness can be reduced. Thereby, the opening property by a straw can be improved.

It is sectional drawing of an example of the cover body in this invention. It is a figure which shows the back surface of the cover body in this invention. It is a figure which shows the surface of the cover body in this invention. It is sectional drawing of the other example of the cover body in this invention. It is a perspective view of the container for sealing concerning this invention.

  Next, the present invention will be specifically described. The container for sealing which concerns on this invention is a container for food packaging which can peel and open a cover body, when a cover body is opened with a straw and it heats with a microwave oven. FIG. 5 is a perspective view of a sealing container according to the present invention. In the example shown here, the container 1 is formed in a cup shape, and the body 4 is formed in a tapered shape so that the outer diameter gradually decreases from the opening 2 toward the circular bottom 3. have. A flange portion 5 is formed at the end of the body portion 4 on the opening 2 side, and a lid 6 having a diameter larger than that of the flange portion 5 is thermocompression bonded to the upper surface 5a. By doing so, the space formed by the container 1 and the lid 6 is sealed. The lid 6 is formed with a knob portion 7 that protrudes outward in the radial direction. As will be described later, when the container 1 is heated together with the lid body 6, the knob 5 is lifted to raise the upper surface 5 a. The lid body 6 is peeled off. In addition, an insertion portion 8 for piercing the straw is formed at the center of the lid body 6.

  The container 1 is preferably formed of a polyolefin resin such as a polyethylene resin or a polypropylene resin, a polyester resin such as a polyethylene terephthalate resin, a thermoplastic resin material such as a nylon resin, or a styrene resin. Moreover, when the container 1 can be used with a microwave oven and the contents of the container 1 are heated by the microwave oven, it is preferably formed of a material that is not easily deformed by heat, that is, can maintain the shape of the container 1.

  FIG. 1 is a cross-sectional view of an example of a lid body 6 according to the present invention. The lid 6 is configured by laminating a second base material layer 10 on one surface of the first base material layer 9 which is an outer layer with an adhesive. As shown in FIG. 1, the adhesive forms an adhesive layer 11 between the first base material layer 9 and the second base material layer 10. In addition, a seal layer 12 that is in close contact with the upper surface 5a of the flange portion 5 described above is formed on the surface of the second base material layer opposite to the first base material layer 9.

  Said 1st base material layer 9 is provided with the 1st resin film layer 13 arrange | positioned at the outermost side, ie, surface, of the cover body 6, and the 2nd resin film layer 14 arrange | positioned inside the container 1 rather than this. ing. The first resin film layer 13 is made of a polyester resin film such as polyethylene terephthalate resin or a nylon resin film. One surface of the first resin film layer 13 is a printing surface on which predetermined printing is performed, and a layer of paint obtained by the printing is the printing layer 15.

  The second resin film layer 14 is made of a polyester resin film such as polyethylene terephthalate resin. A heating element layer 16 that generates heat by receiving electromagnetic waves is formed on the surface of the second resin film layer 14 opposite to the first resin film layer 13. The heating element layer 16 is configured by evaporating a metal such as aluminum, tin, zinc, iron, copper, or an oxide thereof, for example.

  A method for forming the heating element layer 16 will be briefly described. The second resin film layer is formed by selecting one or more kinds of metals or oxides from the various metals and their oxides as a deposition material and evaporating or sublimating the deposition material in the chamber. It vapor-deposits on the surface of one side. In addition, the metal vapor deposition method with respect to the resin film may be a conventionally known method. Next, a protective layer 17 having a predetermined pattern is formed on the metal film deposited as described above, that is, on the heating element layer 16 by printing or painting. So-called masking is performed. Thereafter, the heating element layer 16 that is not covered with the protective layer 17 with a predetermined agent is removed. As a result, a heating element layer 16 having a predetermined pattern shape is formed on one surface of the second resin film layer. For example, as shown in FIG. 2, the heating element layer 16 is formed in a lattice shape.

  The printing layer 15 of the first resin film layer 13 and the other surface of the second resin film layer 14 are bonded to each other through an adhesive mainly composed of a thermosetting resin. The adhesion method may be a conventionally known method such as a dry laminating method. The adhesive forms an adhesive layer 18 as shown in FIG. And in the predetermined range in the center part of the 1st base material layer 9 of the said structure, as shown in FIG. 3, multiple through-holes 19 are formed, and the 1st base material layer 9 in the said predetermined range of The strength is reduced. As an example, the predetermined range is a range corresponding to the outer shape of the straw, and therefore, the predetermined range is an insertion portion 8 for piercing the straw. Each through hole 19 can be formed by, for example, laser processing. The insertion portion 8 corresponds to the fragile portion in the present invention.

  Said 2nd base material layer 10 is comprised by polyester-type resin films, such as a polyethylene terephthalate resin. The thickness is preferably in the range of 10 μm to 20 μm. If the thickness of the second base material layer 10 is thinner than 10 μm, the strength of the lid 6 may be insufficient. On the other hand, when it is thicker than 20 μm, the strength of the lid 6 can be ensured, but there is a possibility that it is difficult to pierce the straw.

  The sealing layer 12 described above is formed on the surface of the second base material layer 10 opposite to the first base material layer 9, that is, the surface disposed inside the container 1. In the example shown here, the seal layer 12 is a coating film of a polyolefin resin having thermoplasticity such as polypropylene resin or polyethylene resin. For example, a solution in which a polypropylene resin is dispersed is used as the second base material layer 10. Is applied to one surface of the substrate, and then heated to dry the solvent and melt the polypropylene resin to form the polypropylene resin into a thin film. Before forming the seal layer 12, the second base material layer 10 is subjected to corona discharge treatment to make the surface hydrophilic, or an oxide film such as silica or alumina is formed. Good. By doing so, the adhesion or adhesion of the seal layer 12 to the second base material layer 10 can be improved. The thickness of the sealing layer 12 is preferably in the range of 1 μm to 10 μm. When the thickness of the sealing layer 12 is less than 1 μm, there is a possibility that the adhesive strength of the lid body 6 will be insufficient. On the other hand, when the thickness is larger than 10 μm, the adhesive strength of the lid body 6 is strong. It may become too much and the lid opening property may decrease.

  The first base material layer 9 is laminated on the surface of the second base material layer 10 on the first base material layer 9 side through an adhesive mainly composed of a thermosetting resin. The adhesive forms the adhesive layer 11 as described above. As an example, the adhesive is composed of an epoxy resin, a polyester resin, a copolymer resin of an epoxy resin and a polyester resin, and the like, and a curing agent such as a melamine resin or an isocyanate resin is added thereto. As will be described later, this adhesive is heated and dried after being applied to the other surface of the second base material layer 10. Thus, the adhesive layer 11 is formed, and the first base material layer 9 is bonded to the adhesive layer 11.

  A method for manufacturing the lid 6 will be briefly described. The first base film 9 is configured by laminating the first resin film 13 and the second resin film 14 as described above. A plurality of through holes 19 are formed within a predetermined range in the first base material layer 9. Each through hole 19 is formed by, for example, laser processing. Separately, a polyester-based resin film is prepared, and first, the polyolefin-based resin having the thermoplasticity described above is applied to one surface of the polyester-based resin film, and heated and melted to form the polyolefin-based resin in a thin film shape. That is, the seal layer 12 is formed. Next, an adhesive mainly composed of a thermosetting resin is applied to the other surface of the second base material layer 10. The adhesive is dried for 5 minutes at a temperature lower than the melting point temperature of 150 ° C. of the polyolefin resin constituting the seal layer 12, for example, 100 ° C., to form the adhesive layer 11. In this way, the second base material layer 10 is configured. Thereafter, the second resin film 14 of the first base material layer 9 is overlaid on the adhesive layer 11, and the first base material layer 9 and the second base material layer 10 are rotated at a linear pressure of 50 N / cm in that state. Crimping is performed by passing between a pair of crimping rollers. Under this pressure bonding condition, the adhesive constituting the adhesive layer 11 is less likely to enter the through hole 19. In this way, a sheet having a laminated structure is formed, and the sheet is formed into a predetermined shape to form a lid 6. And the sealing layer 12 of the cover body 6 is thermocompression-bonded to the upper surface 5a of the flange part 5 so as to seal the opening 2 of the container 1 filled with the contents. For example, this is performed at 170 ° C. and 2 MPa for 1 second. The step of forming the through hole 19 corresponds to the first step in the present invention, and the step of forming the seal layer 12 and the adhesive layer 11 on the second base material layer 10 is the second step in the present invention. It corresponds to. Further, the step of bonding the base material layers 9 and 10 corresponds to the third step in the present invention, and the step of bonding the lid 6 to the container 1 corresponds to the fourth step in the present invention.

  In the container 1 having the above-described configuration, since the insertion portion 8 is formed only in the first base material layer 9 in the insertion portion 8, the strength of the lid 6 is not particularly impaired. Further, since the heating element layer 16 is provided, when the container 1 is heated together with the lid body 6 by a microwave oven, the heating element layer 16 can generate heat, and the heat can soften or melt the sealing layer 12. it can. Thereby, the lid body 6 can be easily peeled off from the container 1, and for example, a beverage filled in the container 1 can be drinked without using a straw. The heat of the heating element layer 16 is transmitted to the sealing layer 12 through the adhesive layer 11 and the second base material layer 10. Furthermore, since the adhesive layer 11 is mainly composed of a thermosetting resin, it is hardly deformed by heat and is not easily deteriorated by heat. And since said 2nd base material layer 10 is comprised by the polyester-type resin film, compared with the case where the 2nd base material layer 10 is formed with polyolefin resin, the 2nd base material layer 10 is also thermally deformed. Hateful. As a result, the lid 6 is difficult to be thermally deformed. Further, since the adhesive constituting the adhesive layer 11 is dried at a temperature lower than the melting point temperature of the polyolefin resin constituting the seal layer 12, the adhesive strength of the seal layer 12 is not impaired.

  FIG. 4 is a cross-sectional view of another example of the lid body 6 according to the present invention. The example shown here is an example in which the first base material layer 9 and the second base material layer 10 are pressure-bonded so that the adhesive constituting the adhesive layer 11 enters each through-hole 19. After forming the adhesive layer 11 as described above, the base material layers 9 and 10 are passed between a pair of pressure rollers rotating at a linear pressure of 150 N / cm so that the adhesive enters the through hole 19. Crimp with this. In the lid body 6 having the configuration shown in FIG. 4, the adhesive enters the through hole 19 from the end adjacent to the adhesive layer 11 to the middle of the through hole 19 in the through hole 19. The adhesiveness between the material layer 9 and the second base material layer 10 is improved. Further, the so-called elongation of the second resin film 14 and the second base material layer 10 around the through hole 19 is suppressed as compared with the example shown in FIG. That is, their strength or hardness is improved. In other words, the insertion portion 8 is more fragile than the example shown in FIG. As a result, when a straw is inserted into the insertion portion 8, each film can be easily broken by the straw, and the unsealing property by the straw can be improved.

  DESCRIPTION OF SYMBOLS 1 ... Container for sealing, 2 ... Opening part, 6 ... Cover body, 9 ... 1st base material layer, 10 ... 2nd base material layer, 11 ... Adhesive layer, 12 ... Sealing layer, 19 ... Through-hole.

Claims (6)

In a sealing container having a lid that seals the opening and is opened by a straw,
The lid is configured by a first base material layer in which a fragile portion for piercing the straw is formed, and a polyester-based resin film that is laminated on one surface of the first base material layer with an adhesive. The second base material layer, and a seal layer formed on a surface of the second base material layer opposite to the first base material layer and closely attached to the opening. Container for sealing.   The sealing container according to claim 1, wherein the sealing layer is a coating film of a synthetic resin material having thermoplasticity. The first base material layer is provided with a heating element layer that generates heat upon irradiation with electromagnetic waves,
The sealing container according to claim 1, wherein the sealing layer is configured to be softened by heat generated by the heating element layer.   The said weak part is formed of the through-hole which penetrates the said 1st base material layer, The said adhesive has penetrated into the said through-hole, The Claim 1 thru | or 3 characterized by the above-mentioned. Sealing container. In the method of manufacturing a sealing container having a lid that seals the opening and is opened by a straw,
The lid includes a first base material layer, a second base material layer that is laminated on one surface of the first base material layer with an adhesive and is formed of a polyester resin film, and the second base material layer. A sealing layer that is formed on the surface of the base material layer opposite to the first base material layer and is in close contact with the opening;
A first step of forming a fragile portion for piercing the straw in the first base material layer;
The adhesive layer is formed on the surface of the second base material layer on the first base material layer side, and the seal is formed on the surface of the second base material layer opposite to the first base material layer. A second step of forming a layer, a third step of subsequently bonding the first base material layer and the second base material layer via the adhesive, and further thereafter the second base material layer and the And a fourth step of adhering the opening to the sealing layer via the sealing layer.   6. The method for manufacturing a sealing container according to claim 5, wherein the sealing layer is formed by coating a synthetic resin material having thermoplasticity on one side of the second base material layer.

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