JP6343482B2 - Sealing container and method for manufacturing the same - Google Patents

Description

The present invention relates to a sealing container and a manufacturing method having the lid is opened an opening by sealed and 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.

The present invention was made in view of the above-described technical problems, to provide a sealing container and a manufacturing method that can be heated in can be and microwaves to pierce the straw easily to the lid It is for the purpose.

To achieve the above object , the present invention provides a sealing container having a lid that seals an opening and is opened by a straw, wherein the lid includes at least a fragile portion for piercing the straw , a first base layer having a heat layer that generates heat by receiving a deposited film electromagnetic radiation have been made form by containing a metal, on one side surface of the first base layer, a thermosetting the a second base layer formed by and polyester resin film is laminated through the adhesives formed of a synthetic resin material having, opposite to the first base layer in the second base layer the surface, e Bei a thermoplastic made form a synthetic resin material having and sealing layer to be brought into close contact with the opening, the heating element layer, the second base layer side of the first base layer Provided on the surface, said The sealing layer is configured to soften by generating heat upon receiving magnetic wave irradiation, and the weakened portion is formed on at least a part of the first base material layer, and the first base material layer and the The heating element layer is formed by a plurality of through holes that penetrate the heating element layer and reach the adhesive, and the heating element layer exposed to the inner surface of the through hole by forming the through hole is formed in the through hole. The adhesive is covered with the infiltrated adhesive .

Is placed in the inventions, the sealing layer is a sealing container, which is a coating film of the synthetic resin material that have a the thermoplastic.

The method of manufacturing this inventions is a method of manufacturing a sealed container having a lid is opened an opening by sealed and straw, the lid includes a first base layer, the first base layer a second base layer formed by either one polyester resin film is adhered by one side against adhesive formed of a synthetic resin material having a thermosetting the surface of the in the second base layer the the first base layer and a sealing layer is brought into close contact with and the opening made form a synthetic resin material having a thermoplastic on the opposite side, the in the first base layer second base layer side Forming a heating element layer that softens the sealing layer by receiving electromagnetic waves on the surface, and then a plurality of layers penetrating the first base material layer and the heating element layer in their thickness direction By forming a through hole, the through hole Exposing said heat generating layer on the surface, and a first step of forming a weak portion for piercing the prior SL straw, of the adhesive to the surface of the first base layer side of said second base layer A second step of forming a sealing layer on the surface of the second base material layer opposite to the first base material layer, and then the first base in the first step. In the state where the heating element layer formed on the material layer and the adhesive layer formed on the second base material layer in the second step are overlapped with each other, the through holes are formed by pressure bonding them. together to penetration of the adhesive into the interior of, by said adhesive agent has penetrated the interior of the through hole, the covering of the heating element layer exposed to the inner surface of the through hole and said before and Symbol first base layer first a third step of the second base layer to contact applied by the adhesive, further thereafter, before Symbol Is a manufacturing method of a sealed container, characterized in that a fourth step of the second base layer and said opening is bonded through the sealing layer.

Te this inventions manufacturing method odor, the sealing layer is a method of manufacturing a sealed container, characterized in that it is formed by coating the synthetic resin material that have a pre-Symbol thermoplastic.

According to this invention, since a weak part is formed only in the 1st base material layer, the 2nd base material layer can maintain the intensity. 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.

Further, according to the present invention, since sheet Lumpur layer is a coating of a synthetic resin material having a thermoplastic, it is possible to reduce the thickness thereof in comparison with the case of constituting the sealing layer by the film. Thereby, the thickness of the whole cover body can be made thin and the openability by a straw can be improved.

Furthermore, according to this inventions, and the heating element is provided for heating receiving electromagnetic waves, so as to soften the sealing layer by heat the heating element emits. 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.

Then, according to the present invention, since the adhesive is introduced into an interior of the through-hole serving as a fragile portion, adhesion between the first base layer and the second base 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 this inventions manufacturing method, forming the first base layer forming the weakened portion, for stacking a second substrate layer, the fragile portion in the first substrate layer after laminating each substrate layer Compared with the case where it does, a weak part can be formed only in the 1st 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.

Further, according to the inventions of the manufacturing method, since shea Lumpur layer is a coating film, it is possible to reduce the thickness of the entire sealing layer and the lid as compared to a case of constituting the sealing layer with a film . Thereby, the opening property by a straw can be improved.

It is sectional drawing of the reference example of the cover body in this invention. It is a figure which shows the back surface of the cover body shown in FIG. It is a figure which shows the surface of the cover body shown in FIG. It is sectional drawing of an 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 a reference example of the lid body 6 in 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 of 14 . 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, the strength of the lid body 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 . Contact Chakuzaiso 11 because it is composed mainly of a thermosetting resin, hardly thermally deformed, also hardly 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 an example of the lid body 6 in 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. This also from the example shown in FIG. 1, is a so-called growth suppression of the second resin film 14 and the second base layer 10 near the through-hole 19, its those of 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 (4)

In a sealing container having a lid that seals the opening and is opened by a straw,
The lid has a weakened portion for piercing the straw, a first base layer having a heat layer that generates heat by receiving a deposited film electromagnetic radiation have been made form by containing at least metals,
The surface of one side of the first base layer, a second base layer formed by and polyester resin film is laminated through the adhesives formed of a synthetic resin material having a thermosetting,
Wherein the surface opposite to the first base layer in the second base layer, Bei example a sealing layer is brought into close contact made form and the opening of a synthetic resin material having a thermoplastic,
The heating element layer is provided on the surface of the first base material layer on the second base material layer side, and is configured to soften the seal layer by generating heat upon receiving the electromagnetic wave,
The fragile portion is formed in at least a part of the first base material layer, and is formed by a plurality of through holes that penetrate the first base material layer and the heating element layer and reach the adhesive. And
The heating container layer exposed to the inner surface of the through-hole by forming the through-hole is covered with the adhesive that has entered the through-hole . The sealing layer is sealed container according to claim 1, characterized in that the coating of the synthetic resin material that have a the thermoplastic. In the method of manufacturing a sealing container having a lid that seals the opening and is opened by a straw,
The lid is configured a first base layer, the one side of which either One polyester resin film bonded by a synthetic resin material contact adhesive formed by having thermosetting properties to the surface of the first base layer a second base layer which is the sealing layer is brought into close contact with and the opening made form a synthetic resin material having a thermoplastic on the opposite side to the first base layer in the second base layer And
A heating element layer that softens the sealing layer by generating heat by receiving electromagnetic wave irradiation on the surface of the first base material layer on the second base material layer side, and then the first base material layer and the the heat generating layer to expose the heat generating layer on the inner surface of the through hole by forming a plurality of through holes penetrating in their thickness direction, and forms a weak portion for piercing the prior SL straw first 1 process,
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, thereafter,
In the state where the heating element layer formed on the first base material layer in the first step and the adhesive layer formed on the second base material layer in the second step are overlapped with each other, The adhesive is allowed to enter the inside of the through hole by crimping them, and the heating element layer exposed to the inner surface of the through hole is covered with the adhesive that has entered the inside of the through hole and a third step of contact wear and serial first substrate layer and said second substrate layer by the adhesive, further thereafter,
Method of manufacturing a sealed container, characterized in that the before and Symbol second base layer the opening and a fourth step of bonding via the seal layer. The sealing layer, the manufacturing method of sealing containers according to claim 3, characterized in that it is formed by coating the synthetic resin material that have a pre-Symbol thermoplastic.

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