JP3883157B2 - Manufacturing method of double package - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a package having a double structure, and more specifically, a small package filled with another content is inserted into and integrated with a large package filled with a certain content, The present invention relates to a method for producing a double package suitable for uses such as pharmaceuticals and foods.
[0002]
[Prior art]
In the fields of pharmaceuticals and foods, a method may be employed in which a plurality of raw materials are separately packaged in advance and mixed immediately before use. In particular, if the raw materials are mixed and then stored, such packaging methods may be used if there is a risk of aging during storage due to the effects of light, heat, etc., or contamination with bacteria or the like during mixing. It is valid.
[0003]
As one specific method, there is known a packaging body in which containers containing two contents as described in JP-A-2-4671 are connected in series and the connecting portions are communicated in use. Yes. This method is a preferred packaging method if both containers are approximately the same size, but sometimes one packaging container must be made extremely small compared to the other, in which case the balance is balanced. It is difficult to adopt because it lacks and is difficult to use.
[0004]
As another packaging method improved in this respect, there is a double package in which a small package is enclosed in a large package. In use, the contents in the small package are operated so as to flow into the large package, both contents are mixed in the large package, and then the mixture is taken out and used. When the mixture is a substance that easily changes with time or it is desired to avoid contamination by bacteria or the like until just before use, the packaging form by this method is advantageous.
[0005]
However, when manufacturing this double package, the outer surface of the small package to be sealed must be sterilized in advance, and an efficient sealing technique is required when integrating the two packages. There are many difficulties.
[0006]
For example, heat sealing technology as a method of sealing plastics can realize reliable sealing with extremely simple operations, but in order to proceed efficiently, it can be sealed at low temperatures and a sealing jig (seal bar) When using an automatic liquid filling machine, it is necessary to have a layer that does not melt or soften at the heat sealing temperature because the film is sealed after filling while moving under tension. Requested from the aspect. Therefore, as a plastic, a two or more layers plastic film consisting of a low melting point resin layer as a heat seal layer and a high melting point resin layer that does not adhere to the seal bar and does not melt and stretch is often used. used. However, when another film is heat sealed on the high melting point resin side of the two or more layers of plastic film, it is necessary to dispose a higher melting point plastic film. At that time, the low melting point resin layer that has already been sealed may be melted and peeled again at a high heat sealing temperature, and the resin in a large packaging bag will melt at a high heat sealing temperature, resulting in seal leakage. This is a difficult and difficult heat seal molding technology.
[0007]
[Problems to be solved by the invention]
Therefore, in the present invention, when manufacturing a double-structured package, in order to increase the manufacturing efficiency and ensure sealing, a small package when a small package is enclosed and integrated in a large package. Various studies have been repeated for the purpose of improving the heat sealing method when integrated with the prevention of contamination of the outer surface, and the present invention has been achieved.
[0008]
[Means for Solving the Problems]
  That is, the present invention has two or more layers.(Excluding double layer)Film(Hereafter, it may be referred to as “a film having two or more layers”.)The innermost layer of the filled bag layer of the film has a lower melting point than the release layer resin, and the outermost layer resin of the filled bag layer is formed of a resin having poor adhesion to the release layer resin. Then, the packaging container is filled with the contents, and filling is performed using an automatic liquid filling machine and the opening is heated under the condition that the innermost layer resin of the filling bag layer is melted and the release layer resin is not melted. The package is hermetically sealed by sealing, and after that, the release layer film is peeled off to change to an interpolated package composed of only the filled bag layer film, while the innermost layer resin that can be heat-sealed with the interpolated package A packaging container having the above-described structure, and filling the contents different from the above to form an external package, inserting at least one interpolated package into the external package, and opening the external package Overlap the end of the insert package By heat sealing by a method for manufacturing a double wrapper, characterized by sealing the integrating both and external packaging.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Method for producing an interpolated package
The insertion package enclosed in the double package is manufactured through the following steps.
First, a film of two or more layers comprising a filling bag layer and a release layer is prepared, and a packaging container is manufactured to fill the contents. The film of two or more layers used here consists of a filling bag layer disposed on the inner side and a release layer disposed on the outer side when it becomes a packaging container. The filling bag layer may be a single layer or multiple layers, but the resin forming the innermost layer has a lower melting point than the release layer resin, and the resin forming the outermost layer of the filling bag layer is the release layer resin. Resin with poor adhesive strength is selected.
[0010]
The relationship between the low melting point and the high melting point here means that when two or more films are heat-sealed under a certain temperature condition, the innermost layer resins of the filling bag layer melt and adhere to each other, and the release layer resin Refers to such a temperature relationship that does not melt at that time, and therefore does not adhere to the seal bar, and that the film of two or more layers is not stretched even when a tension is applied. When selecting the resin for forming the filling bag layer and the release layer, the resin is first selected from the resins satisfying the heat sealing relationship. Under normal heat-sealing conditions, the innermost layer resin of the filled bag layer should have a melting point or softening point than the release layer resin (the following is expressed only as a high melting point, but since there is no melting point, it should be called a high softening point) Resin is also included, and the term “melting” also includes a softening state).
[0011]
Further, the outermost layer resin and the release layer resin of the filling bag layer are required to have poor adhesion to each other. Here, the poor adhesion to each other means that the outermost layer of the filling bag layer and the release layer do not adhere completely during the production of two or more films and under the above-mentioned heat sealing conditions, It means such an adhesive strength between the resins that the release layer is easily peeled off from the filling bag layer or has a relationship of being easily peeled off. The delamination strength between the outermost layer and the release layer of the filling bag is usually preferably 100 gf / 1.5 cm width or less, more preferably 50 gf / 1.5 cm width or less.
[0012]
The resin used for the production of the film of two or more layers has a wide range as long as it satisfies the properties required for the interpolated package, for example, hygiene, moldability, mechanical strength, transparency, flexibility, etc. Selected from plastics. Examples of such plastics include polyolefin resins, polyester resins, polyamide resins, acrylonitrile resins (for example, trade name Barex manufactured by Mitsui Chemicals, Inc.), and the like. Among them, types suitable for the filling bag layer resin and the release layer resin are selected. Particularly, since the polyolefin resin satisfies the above-mentioned performance, it is preferably selected for any layer. In particular, the innermost layer resin of the filling bag layer in contact with the contents filled in the container is preferably a low melting point polyolefin resin.
[0013]
Polyolefin resins include high density polyethylene, low density polyethylene, linear low density polyethylene, branched linear low density polyethylene, ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer, polypropylene, propylene. An α-olefin copolymer, poly-4-methyl-1-pentene, cyclic polyolefin and the like are preferably used, and a blend thereof may be used.
[0014]
Examples of the ethylene-α-olefin copolymer include 0.1 to 20 mol of an α-olefin unit such as propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, and 1-octene. % Ethylene copolymer is preferable, and can be produced in a range from low density to high density using a Ziegler catalyst or a metallocene catalyst. As the propylene-α-olefin copolymer, a propylene copolymer containing 0.1 to 20 mol% of an α-olefin unit such as ethylene and 1-butene can be produced using the above catalyst system. I can do it.
[0015]
Examples of the cyclic polyolefin include 0.1 to 50 mol% of α-olefin units such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene and 1-octene, and cyclic olefins. A certain tetracyclododecene or a derivative thereof or a copolymer with norbornene or a derivative thereof is preferable. Further, a ring-opening polymer of tetracyclododecene or its derivative, norbornene or its derivative, which is a cyclic olefin, is desirable.
[0016]
As a preferable combination example of the filling bag layer resin and the release layer resin, when the inner layer of the filling bag is polyethylene, the intermediate layer is cyclic polyolefin, and the outer layer is polyethylene, the release layer resin is poly-4-methyl-1-pentene, nylon- 6 resin, nylon-66 resin, polyethylene terephthalate resin, etc. are selected from the viewpoints of their melting points or softening points and adhesive strength.
[0017]
As a specific structure of two or more layers, a copolymer of ethylene and 4-methyl-1-pentene, a copolymer of ethylene and 1-butene, or a copolymer of ethylene and 1-hexene A linear low density polyethylene is selected as the inner and outer layer resin of the filled bag layer, a copolymer resin of ethylene and tetracyclododecene is selected as the intermediate layer of the filled bag layer, and poly-4-methyl-1- When pentene is selected, the heat seal between the inner layer resins is firmly bonded to each other at a low temperature of about 115 to 140 ° C., for example, and the outer layer resin adheres to the seal bar, and the film is stretched when using the automatic filling machine. In addition, the release layer resin can be easily peeled from the packaging container when the interpolated package is manufactured.
[0018]
Since the filling bag layer resin becomes a container part of the interpolated package, flexibility, impact resistance, or transparency as a container is required in addition to heat sealability. Thus, for example, when polyethylene is used as part of a filled bag layer resin, the polyethylene has a molecular weight sufficient to form a film and has a density and crystallinity that provides adequate flexibility, impact resistance, or transparency. It is desirable to have Such polyethylene has a melt flow rate measured by ASTM D-1238 (190 ° C., 2.16 kg) of 0.1 to 50 g / 10 min, preferably 0.5 to 20 g / 10 min. Density measured by ASTM D-1505 is 0.90 to 0.95 g / cm^Three, Preferably 0.91 to 0.94 g / cm^ThreeIt is chosen from the range. In order for the inner layer resin to have such physical properties, it may be one kind of polyethylene or a blend system of two or more kinds of polyethylene. For example, high-density polyethylene or high-pressure method low-density polyethylene can be mixed with a linear low-density ethylene-α-olefin copolymer, and the melt flow rate and density range can be adjusted.
[0019]
Also, in order to stably fill and heat-seal the inner layer package using an automatic filling machine, it is filled with polypropylene, cyclic polyolefin, polyamide, polyethylene vinyl alcohol, poly-4-methylpentene-1, etc. that do not melt at the sealing temperature. The technique used as at least one of the bag layers is excellent. Among these, it is selected from those having a melting point of 120 ° C. or higher. Among polypropylene and cyclic polyolefin, cyclic polyolefin is superior in improving the bag breaking property of the insert package.
If the filling bag layer is multilayer. The innermost layer has a low melting point or low softening point of 5 ° C. or more, preferably 10 ° C. or more than the outer layer, and at the time of heat sealing, at least a part of the outer layer remains unmelted, and after the release layer is peeled off It is effective in preventing leakage of contents.
When the filling bag layer is a multilayer, the delamination strength is usually 300 gf / 1.5 cm width or more, more preferably 500 gf / 1.5 cm width or more.
[0020]
In addition, if an easy peel property is imparted to the interlayer adhesive part (heat seal part) between the innermost resin layers of the filled bag layer, if force is applied to the interpolated package when using the double package, the interlayer adhesive part Since the contents flow out and move into the outer package, it is suitable for mixing both contents. When using in such a manner, as an innermost layer resin of the filling bag layer, if a predetermined amount of polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-pentene, polyamide, etc. is blended, easy peel Since sex appears, it is convenient.
[0021]
The resin constituting the release layer has a molecular weight having film formability. When polypropylene is used, its melt flow rate is 0.1 to 50 g / 10 min, preferably 0.5 to 20 g / 10, as measured according to ASTM D-1238 (230 ° C., 2.16 kg). It is desirable to be in the range of minutes. The crystallinity by X-ray diffraction method is 40% or more, preferably 50% or more, and the melting point (Tm) by DSC method is preferably 100 to 165 ° C, more preferably 110 to 140 ° C. Even when poly-4-methyl-1-pentene is used, it is desirable that the melt flow rate be in the range of 0.1 to 50 g / 10 minutes, preferably 0.5 to 30 g / 10 minutes, and ASTM D- The density measured at 1505 is 0.810 to 0.850 g / cm^Three, Preferably 0.820 to 0.840 g / cm^ThreeIs preferred. . In addition, since it is temporarily in the shape of a container and filled with the contents, it has mechanical properties that can withstand it and a tensile strength that does not break when it is peeled off from the inner resin layer.
[0022]
The film of two or more layers is manufactured by coextrusion inflation molding, coextrusion T-die molding, extrusion laminating processing, pressure bonding processing between films, or the like. The thickness of the film is 20 to 150 μm, preferably 40 to 100 μm, and the filling bag layer is 40 to 90%, preferably 50 to 80% of the total thickness.
[0023]
These two or more layers are intended to be continuously filled with an automatic liquid filling machine, but the bottom and the necessary peripheral parts are heat-sealed to form a container such as a bag, tube or bottle. It is also possible to form, then fill the contents, heat seal the opening, and seal the contents to form a package. Alternatively, a film of two or more layers can be formed into a container shape such as a bag while heat-sealing, and the contents can be filled at the same time to form a package. Furthermore, a packaging container can be manufactured at once by a blow molding method, and the contents can be filled to form a sealed package.
[0024]
Next, a peeling layer part is peeled off from this package, and it changes into the insertion package which consists only of a filling layer film. When a package filled with contents from two or more layers is continuously produced, it can be easily peeled off by continuously winding up the end of the release layer to be peeled off. .
[0025]
When the above two or more layers of the film are manufactured by coextrusion molding, two or more kinds of resins melted in separate extruders are directly laminated in the die without touching the outside air. When the layer is peeled off, the outer surface of the filled bag layer is in a sterile state as it is. Also in the laminating process, the laminate resin is extruded on the other film in a molten state, and the interface between the two is in an airtight state.
[0026]
Manufacturing method for external packaging
Next, the manufacturing method of an external package is demonstrated.
A packaging container for an external packaging body is formed by forming a film from the above-described interpolated packaging body and a heat-sealable resin, and the bottom and necessary peripheral parts are formed into a bag shape, bag shape, tube shape, bottle by an operation such as heat sealing. Shape into a container. It is good also as a container directly by the blow molding method. Since this external packaging container is integrated with the insertion packaging body and heat sealing in a later step, it is necessary that the resins constituting both packaging bodies be firmly bonded to each other under one sealing condition. For that purpose, it is desirable that the outermost layer of the interpolated package and the innermost layer of the outer packaging container are close in melting point of the resin and similar in chemical structure. Therefore, it is preferable that both portions are substantially similar resins, and are not necessarily limited to the same resin.
[0027]
Unlike the insertion package, the heat sealing operation between the external packaging container and the insertion package is preferably performed under mild conditions and at a low speed. That is, for the external packaging container, a resin that meets the above-described conditions may be selected, and then the container may be directly manufactured.
[0028]
When the interpolated package is manufactured from a packaging container of polyolefin resin such as polyethylene, polypropylene, cyclic polyolefin, etc., the outer package is also a range of polyolefins such as ethylene or propylene homopolymers, copolymers, and blends thereof. Or a laminated film having such a polyolefin resin as a sealant layer.
[0029]
The laminated film is a film of two or more layers in which the sealant layer is bonded to at least one base material layer made of other polyolefin, polyester, polyamide or the like directly or via an adhesive layer.
[0030]
The sealant layer forms at least an adhesive layer with the interpolated package, and sometimes bears a part of the strength. As such a sealant resin, the polyolefin described in the section of the method for producing an interpolated package, particularly a polyethylene resin, can be suitably used. As the physical properties of polyethylene, the melt flow rate measured by ASTM D-1238 (190 ° C., 2.16 kg) is 0.1 to 50 g / 10 min, preferably 0.5 to 20 g / 10 min. The density measured by D-1505 is 0.88 to 0.95 g / cm.^Three, Preferably 0.90 to 0.94 g / cm^ThreeIt is chosen from the range. This polyethylene may be a single type of polyethylene or a blend system of two or more types of polyethylene, or other polyolefins or other polymers. For example, a high pressure process low density polyethylene is mixed with a linear low density ethylene-α-olefin copolymer, or a copolymer of amorphous ethylene and propylene or 1-butene is mixed, It can also be adjusted to the rate and density range.
[0031]
Since the base material layer must satisfy the performance as a container, the resin constituting the base material layer has a molecular weight capable of forming a film and physical properties such as transparency, flexibility, and impact resistance. Typical examples of such resins include polyethylene and polypropylene resins. When the adhesion between the sealant layer and the base material layer is insufficient, it is desirable to provide an adhesive layer in the middle, and graft copolymerization modification with a polar group-containing polyolefin such as acrylic acid, methacrylic acid or maleic anhydride A carboxylic acid-modified polyolefin such as polyethylene may be used for the adhesive layer.
[0032]
The outer packaging container has a layer thickness of 30 to 300 μm, preferably 50 to 200 μm, in order to support the weight of the contents and withstand external impacts. The thickness of the sealant layer when using a laminated film is desirably 10 to 90, preferably 20 to 80% of the whole.
The packaging container is filled with a predetermined amount of contents different from the contents in the interpolated package, or the contents are filled while forming the packaging container, and this is used as the external package.
[0033]
Manufacturing method of double package
Now, at least one interpolated package produced previously is inserted into the external package manufactured in this way. At that time, the end of the insertion package, for example, the opening heat seal part of the insertion package, is overlapped on the inner side of the opening of the outer package, and heat sealing is performed again from the outside of the outer package. By this heat sealing operation, if the outer packaging container has a single-layer structure, the resin melts, and if it is manufactured from a laminated film, the sealant layer melts and adheres firmly to the insertion package. And an insertion package is fixed in an external package, both are integrated, and an external package is sealed simultaneously, and a double package is manufactured. The same can be done even when there are a plurality of insertion packages fixed in the external package.
[0034]
The contents to be inserted and filled in the outer package vary depending on the type of medicine, food, etc. For example, if the purpose is a high-calorie infusion bag, glucose, amino acids, and other drugs are combined in predetermined amounts. Can be filled separately. In using this double package, the contents in the interpolated package are moved into the external package, but the method may be arbitrary. For example, the inner package may be broken by applying force from the outside. If the inner layer resin at the time of producing the interpolated package has easy peel properties, it is also possible to apply force to the interpolated package and move the contents from the heat seal part into the external package. it can.
[0035]
Next, the manufacturing method of one Example of the double package concerning this invention is demonstrated with reference to drawings.
FIG. 1 is a schematic cross-sectional view showing a state immediately before the insertion package is manufactured. First, a four-layer water-cooled inflation film composed of three layers of a filling bag layer 2 and a release layer 3 is filled with the content (A) 6 and heat-sealed using a liquid automatic filling machine, and has sealing portions 4 and 7. The packaging container 5 is manufactured. Thereafter, as shown in FIG. 1, the release layer 3 is peeled off from the packaging container 5, and when all the outer resin layers are removed, the insertion package 1 is manufactured.
[0036]
FIG. 2 shows a schematic cross-sectional view of the double package. The bottom portion 10 of the five-layer inflation film composed of the sealant layer 8 and the four-layer base material layer 9 is heat-sealed to form an external packaging container. The outer package 12 is manufactured by filling the contents (B) 11 in the container. Next, the inner package 1 is inserted into the outer package 12, and the outer surface of the opening heat seal portion 7 of the inner package 1 is superimposed on the inner inner surface of the opening 13 of the outer package. Heat sealing is performed from the outside of the outer package opening 13. As a result, the opening heat seal portion 7 of the internal packaging body and the opening portion 13 of the external packaging body are bonded together, and the internal packaging body 1 is fixed at the opening 13 of the external packaging body 12, and they are integrated. . At the same time, the outer package 12 is sealed, and the double package 14 is completed.
[0037]
【The invention's effect】
According to the present invention, the multilayer film used for producing the interpolated package has a lower melting point than that of the release layer resin, so that the release layer is melted when the innermost resin melts during heat sealing. Does not melt and can be filled continuously even with an automatic liquid filling machine, and if a layer that does not melt at the sealing temperature is provided in the intermediate layer of the filling bag layer, a reliable sealing part that does not leak is formed. Since the release layer resin does not melt, it does not adhere to the heat seal bar and does not stretch the film. Therefore, continuous heat seal molding with an automatic liquid filling machine and high-speed filling of contents are possible.
[0038]
In addition, since the film of two or more layers is produced in an aseptic state between the layers, and then the insertion package can be obtained by a simple operation of peeling the release layer from the packaging container manufactured of the film of two or more layers, Even if no special sterilization operation is performed, the outer surface of the insertion package can be made aseptic as it is.
[0039]
Furthermore, since the outer package itself or the sealant layer is made of a resin that can be heat sealed with the inner package, heat sealing with the outer layer of the filled bag layer can be easily and reliably performed at a low temperature. It can be sealed and the contents in the double package can be kept sterile.
[0040]
【Example】
Next, the present invention will be described through examples, but the present invention is not limited to these examples.
The delamination strength was measured by the following method.
Measuring device: Sagawa Digital Shopper
Measurement temperature: After molding a laminated film test piece having a width of 1.5 mm, the sample is allowed to stand at 23 ± 2 ° C. for 1 week, and then measured at 23 ± 2 ° C.
Measuring method: A measuring device is set to a cross speed and a chart speed of 300 mm / min, and the test piece is supported by hand, and each layer is sandwiched by the measuring device and pulled up and down at 180 ° C. for measurement.
Example 1
The first layer is a polyethylene layer having a thickness of 10 μm (ethylene-4-methyl-1-pentene copolymer, melt flow rate 2.0 g / 10 min, density 0.920 g / cm^Three, Melting point 115 ° C. measured by DSC), second layer is cyclic polyolefin (ethylene / tetracyclododecene, melt flow rate 2.0 g / 10 min, density 1.05 g / cm^Three, Heat deformation temperature 125 ° C., third layer is a 10 μm thick polyethylene layer (ethylene / 4-methyl-1-pentene copolymer, melt flow rate 2.0 g / 10 min, density 0.920 g / cm^Three, Melting point 115 ° C. measured by DSC), and the fourth layer was 30 μm thick poly-4-methyl-1-pentene (melt flow rate 26.0 g / 10 min, density 0.834 g / cm^Three, A melting point of 240 ° C.) was produced by a coextrusion molding method, and an amino acid was continuously filled and heat-sealed at a sealing temperature of 120 ° C. using a liquid automatic filling machine to form a bag. Thereafter, the outer poly 4-methyl-1-pentene layer was peeled off to obtain a 30 μm 3-layer polyolefin package. The delamination strength between the filling bag layer and the release layer at this time was 50 gf / 1.5 cm width. Moreover, the delamination strength of the filled bag layer was 800 gf / 1.5 cm width.
[0041]
On the other hand, the first layer is 40 μm polyethylene (sealant layer: ethylene / 1-hexene copolymer, melt flow rate 4.0 g / 10 min, density 0.920 g / cm^Three, Melting point 116 ° C.), second layer is 60 μ ethylene propylene rubber (base layer 1: ethylene propylene copolymer, melt flow rate 4.0 g / 10 min, density 0.870 g / cm^Three, Melting point 80 ° C.), third layer is 40 μm polyethylene (base layer 2: ethylene / 1-hexene copolymer, melt flow rate 4.0 g / 10 min, density 0.940 g / cm^ThreeThe bottom part was heat-sealed into a large bag using a 140 μm three-layer coextruded water-cooled inflation film having a melting point of 121 ° C.). It was filled with glucose. A small bag filled with amino acid was put in the bag first, the mouths of both were overlapped, and heat sealing was performed from the outside at 120 ° C. The small bag was fixed at the mouth of the large bag, and the large bag was also sealed.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing a state immediately before an embodiment of an interpolated package according to the present invention is manufactured.
FIG. 2 is a schematic cross-sectional view of one embodiment of a double package according to the present invention.
[Explanation of symbols]
1 ... Interpolated package
2 ... Filled bag layer
3 ... release layer
6 ... Contents (A)
8 ... Sealant layer
9 ・ ・ ・ Base material layer
11 ... Contents (B)
14 ・ ・ ・ Double package

Claims (8)

A packaging container consisting of two or more layers (excluding two layers) is prepared, and the filled bag layer, which is the inner layer of the film, has a lower melting point than the resin of the release layer, which is the outer layer, and adhesion to the outer layer resin. A package formed by a single layer or multiple layers formed of a small resin, and then sealed by filling the contents into the packaging container and heat-sealing the opening under conditions where only the inner layer resin melts None, then peel off the release layer film to change it into a single layer or more interpolated packaging body consisting only of a filled bag layer film, while preparing a packaging container made of the above-mentioned interpolated packaging body and heat-sealable resin , Filling the contents different from the previous one to form an external package, and then inserting at least one interpolated package consisting only of the filled bag layer film into the external package, into the opening of the external package End of the insert package By heat sealing superimposed, integrating both and manufacturing method of the double package, characterized by sealing the outer packaging. The method for producing a double package according to claim 1, wherein the melting point or softening point of the innermost layer of the filling bag is lower than the melting point or softening point of the release layer, and the difference is 10 ° C or more. The method for producing a double package according to claim 1, wherein the delamination strength between the outermost layer and the release layer of the filling bag is 100 gf / 1.5 cm width or less. The method for producing a double package according to claim 1, wherein the filling bag layer is formed of a single layer or two or more layers having a delamination strength of 300 gf / 1.5 cm or more in the filling bag. In a packaging container composed of a film of two or more layers (excluding two layers) , the filling bag layer is a single layer or a multilayer film composed of at least one of polyethylene resin, polypropylene resin, and cyclic polyolefin, and the release layer is poly. The method for producing a double package according to claim 1, which is a single-layer or multilayer film formed from at least one selected from 4-methyl-1-pentene, polyethylene terephthalate, polyamide, and polypropylene. . The method for producing a double package according to any one of claims 1 to 5, wherein the film of two or more layers (excluding two layers) is formed by a coextrusion method. The said filling bag layer consists of a multilayer film of two or more layers, The innermost layer is 5 degreeC or more lower melting point or a softening point than the outer layer, The two in any one of Claims 1-6 characterized by the above-mentioned. Manufacturing method of heavy package. The method for producing a double package according to any one of claims 1 to 7, wherein the filling bag layer is a multilayer film of two or more layers, and at least one layer thereof is made of cyclic polyolefin.

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