JP2019182446A - Multilayered film and package - Google Patents

Abstract

To provide a multilayered film improved in curl prevention, and a package using the same.SOLUTION: A multilayered film can provide; when used for a test piece made with a 17 μm-thick aluminum film stuck onto a surface of the multiple layered film directed opposing protruded tablet storing parts, and statically placed on a plain face under an ordinary temperature environment with the tablet storing parts facing upward; an average height of four corners of the test piece from the plain face is 4.0 mm or less, sheet moisture permeability is 0.3 g/m/day or less. The multilayered film comprises: a barrier layer formed of alternately and repeatedly laminated first unstretched film layers containing a first resin and second unstretched film layers containing a second resin different from the first resin, At least one of the first resin and the second resin is a polyolefin-based resin.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a multilayer film and a package.

  In general, foods, pharmaceuticals, and the like are packaged by a packaging body such as a packaging bag or packaging container at the time of sale. Such a package is required to have various performances in order to protect the contents. For this reason, in some packages, a multilayered film is used.

  The multilayer film used for the package is required to have impact resistance and gas barrier properties in order to give the package a function such as protection of contents. For example, Patent Document 1 discloses a method of orienting crystals in a multilayer film by stretching a multilayer film made of a polymer material as means for improving impact resistance and gas barrier properties.

JP 2007-28369 A

  However, the multilayer film disclosed in Patent Document 1 has a problem that since the crystals in the multilayer film are oriented, the impact resistance and gas barrier properties are excellent, but the curl prevention property of the entire film is inferior.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the multilayer film by which the curl prevention property was improved, and a package using the same.

In order to solve the above problems, the present invention employs the following configuration.
[1]. The planar shape is rectangular, the size is 40 mm × 95 mm, and there are two rows of 5 tablet storage portions per row protruding in the thickness direction. The tablet storage portion has an inner diameter of 10.0 mm and a depth. A test piece which is a recess of 4.5 mm and a 17 μm-thick aluminum film is bonded to the surface opposite to the protruding side of the tablet storage part, and the test piece is placed under normal temperature in the tablet When the storage part is faced upward and left on a flat surface, the average height of the four corners of the test piece from the flat surface is 4.0 mm or less, and the sheet moisture permeability is 0.3 g / m ² · day. A barrier in which an unstretched first film layer containing a first resin and an unstretched second film layer containing a second resin different from the first resin are alternately and repeatedly laminated. A layer of the first resin and the second resin At least one Chi is a polyolefin-based resin, a multilayer film.
[2]. The multilayer film according to [1], wherein an average thickness per layer of the first film layer is 10 to 1000 nm, and an average thickness per layer of the second film layer is 10 to 1000 nm.
[3]. Furthermore, it is a multilayer film provided with a pair of unstretched first outer layers sandwiching the barrier layer, and each of the first outer layers is a resin layer containing the first resin and an elastomer [1] or [ 2].
[4]. The multilayer film according to [3], further comprising a pair of unstretched second outer layers sandwiching the pair of unstretched first outer layers.
[5]. The multilayer film according to any one of [1] to [4], wherein the number of laminated first film layers in the barrier layer is in the range of 50 to 5000.
[6]. The multilayer film according to [4] or [5], wherein each of the second outer layers is a resin layer containing the first resin.
[7]. The multilayer film according to any one of [1] to [6], wherein the barrier layer has a thickness in the range of 10 to 500 μm.
[8]. The multilayer film according to any one of [3] to [7], wherein a total thickness of the pair of unstretched first outer layers is in a range of 5 to 125 μm.
[9]. The multilayer film according to any one of [4] to [8], wherein the total thickness of the pair of unstretched second outer layers is in the range of 5 to 125 μm.
[10]. The multilayer film according to any one of [3] to [9], wherein the elastomer is an olefin elastomer.
[11]. The multilayer film according to any one of [1] to [10], wherein the first resin and the second resin are polyolefin resins.
[12]. The multilayer film according to any one of [1] to [11], wherein the first resin is polypropylene.
[13]. The multilayer film according to any one of [1] to [12], wherein the second resin is high-density polyethylene.
[14]. A package provided with the multilayer film as described in any one of [1]-[13].

The multilayer film of the present invention has a rectangular planar shape, a size of 40 mm × 95 mm, and two rows of 5 tablet storage portions protruding in the thickness direction, wherein the tablet storage portion is A test piece having an inner diameter of 10.0 mm and a depth of 4.5 mm and a 17 μm-thick aluminum film bonded to the surface opposite to the protruding side of the tablet storage portion was prepared, When the test piece was allowed to stand on a flat surface with the tablet storage portion facing upward, the average height of the four corners of the test piece from the flat surface was 4.0 mm or less, and the sheet moisture permeability was 0. .3 g / m ² · day or less, an unstretched first film layer containing the first resin, and an unstretched second film layer containing a second resin different from the first resin, A barrier layer that is alternately and repeatedly stacked; Since at least one of the resin the second resin is a polyolefin resin, the film as a whole, excellent in anti-curling properties.

  Moreover, since the package of this invention is equipped with the said multilayer film, it is excellent in curl prevention property.

It is sectional drawing which shows typically one Embodiment of the multilayer film of this invention. It is a perspective view which shows typically one Embodiment of the package of this invention. It is sectional drawing in the II line of the package shown in FIG.

  Hereinafter, a multilayer film which is an embodiment to which the present invention is applied and a package using the same will be described in detail. In addition, in the drawings used in the following description, in order to make the features easy to understand, there are cases where the portions that become the features are enlarged for the sake of convenience, and the dimensional ratios of the respective components are not always the same as the actual ones. Absent.

<< Multilayer film >>
First, the characteristic of the multilayer film 1 of this embodiment is demonstrated.
The multilayer film 1 of the present embodiment has a rectangular planar shape, a size of 40 mm × 95 mm, and includes two rows of five tablet storage portions protruding in the thickness direction, and the tablet storage portion Is a concave portion having an inner diameter of 10.0 mm and a depth of 4.5 mm, and a test piece in which an aluminum film having a thickness of 17 μm is bonded to the surface opposite to the protruding side of the tablet storage portion is prepared in a room temperature environment. When the test piece is allowed to stand on a flat surface with the tablet storage portion facing upward, the average height of the four corners of the test piece from the flat surface is 4.0 mm or less, and the sheet moisture permeability Is 0.30 g / m ² · day or less. That is, the multilayer film of this embodiment has improved anti-curl properties and excellent water vapor barrier properties.

  The average value of the height of the four corners of the test piece from the plane is preferably 3.5 mm or less, more preferably 2.8 mm or less, and may be 0 mm.

  The sheet moisture permeability can be obtained, for example, by measuring the water vapor transmission rate of the multilayer film of the present embodiment by a known method, as in the case of the examples described later.

The sheet moisture permeability is preferably not more than 0.25g ^/ m 2 · day, and more preferably less 0.23g ^/ m 2 · day.

Then, the structure of the multilayer film 1 of this embodiment is demonstrated.
FIG. 1 is a schematic cross-sectional view of a multilayer film 1 of the present embodiment. As shown in FIG. 1, the multilayer film 1 of this embodiment includes a barrier layer 11, a pair of unstretched first outer layers 12 sandwiching the barrier layer 11, and the pair of unstretched first layers. A pair of unstretched second outer layers 13 sandwiching one outer layer. Thereby, the curl prevention property is excellent as the whole film.

  In the present specification, “anti-curl” means warpage resistance of the end of the package unless otherwise specified. For example, in the case of a package having a square planar shape, It means the warping resistance of the four corners of the package.

<Barrier layer>
In the multilayer film 1 of the present embodiment, the barrier layer 11 includes an unstretched first film layer 111 containing a first resin, and an unstretched second film containing a second resin different from the first resin. The layer 112 is alternately and repeatedly stacked. The rigidity of the barrier layer can be improved by alternately and repeatedly laminating film layers containing different resins. As a result, the entire film is excellent in curl prevention.
In addition, since the crystals are oriented without a stretching step during production, the gas barrier property and the moldability are excellent.

  At least one of the first resin and the second resin is a polyolefin resin. Since the polyolefin-based resin is softer than other materials, the tablet can be easily taken out when the tablet storage portion provided in the multilayer film of the present embodiment is pushed in. In addition, it is environmentally friendly because there is no need to use halogen such as fluorine or chlorine. Furthermore, the cost can be reduced.

<First film layer>
The first film layer 111 is alternately laminated with the second film layer 112 described later, and imparts excellent gas barrier properties and molding processability to the multilayer film 1. The first film layer 111 is an unstretched film layer and contains a first resin.
The first film layer 111 may include only the first resin (that is, may include the first resin), or may include components other than the first resin and the first resin. (That is, it may be composed of a first resin and components other than the first resin).

The content of the first resin in the first film layer 111 is preferably in the range of 60 to 100% by mass, more preferably in the range of 80 to 100% by mass, and in the range of 90 to 100% by mass. Is more preferable. When the content of the first resin in the first film layer 111 is in the range of 60 to 100% by mass, it assists the crystal orientation that constitutes the resin of the second film layer 112 described later, and exhibits high barrier properties. Can contribute.

  Examples of the first resin include crystalline resins. Specifically, polyolefin resins such as polyethylene, polypropylene, and polymethylpentene; polyamide resins such as nylon 6 and nylon 66; polyethylene terephthalate, polybutylene Polyester resins such as terephthalate, polybutylene succinate, polyethylene-2,6-naphthalate; polyacetal resin; polylactic acid resin; polyglycolic acid resin; polycaprolactone resin; copolymer resin containing monomers that form the resin Is mentioned. The first resin can be used alone or in combination of two or more thereof.

  Among these, the first resin is preferably a polyolefin resin, and more preferably polypropylene. Since polypropylene is a general-purpose resin among polyolefin-based resins, it is possible to reduce the cost. Moreover, higher heat resistance and moldability can be imparted to the barrier layer 11.

  1 type of 1st resin which the 1st film layer 111 contains may be only 1 type, 2 or more types, and when it is 2 or more types, those combinations and ratios can be arbitrarily selected according to the objective.

  The component other than the first resin included in the first film layer 111 may be a resin component or a non-resin component, but when it is a resin component, it is a resin other than the second resin. Preferably there is.

Among the components other than the first resin, examples of the non-resin component include additives known in the art.
Examples of the additive include antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, organic particles, thickeners, thickeners, heat stabilizers, lubricants, infrared absorbers, ultraviolet absorbers, and the like. Can be mentioned.

  Components other than the first resin included in the first film layer 111 may be one type or two or more types, and in the case of two or more types, the combination and ratio thereof are arbitrarily selected according to the purpose. it can.

  The number of laminated first film layers 111 in the barrier layer 11 is preferably 50 to 5000, more preferably 250 to 4500, for example, 300 to 4000, 450 to 3500, 600 to 3000, 750. Any of 2500 and 750-2000 may be sufficient.

  The number of layers of the first film layer 111 can be confirmed by, for example, cutting the multilayer film 1 using a microtome and observing the cross section of the multilayer film 1 generated by the cutting using an electron microscope. Moreover, it is also possible to calculate the number of layers of the first film layer without observing the cross section from the method for producing a multilayer film described later.

The average thickness per layer of the first film layer 111 is preferably 10 to 1000 nm, more preferably 10 nm or more and less than 500 nm, further preferably 10 to 490 nm, and more preferably 10 to 400 nm. Particularly preferred is 15 to 300 nm, and it may be, for example, any of 15 to 250 nm, 15 to 200 nm, 15 to 150 nm, and 15 to 120 nm.
Here, the “average thickness per layer of the first film layer 111” means that the total thickness of all the first film layers 111 existing in the barrier layer 11 is present in the barrier layer 11. Value divided by the number of layers of the first film layer 111 ([total value of the thickness of all the first film layers 111 present in the barrier layer 11] / [first film layer 111 present in the barrier layer 11) Number of layers]).

<Second film layer>
The second film layer 112 is an unstretched film layer and includes a second resin of a type different from the first resin.
The second film layer 112 may include only the second resin (that is, may include the second resin), or may include components other than the second resin and the second resin. (That is, it may be composed of a second resin and a component other than the second resin).

  The content of the second resin in the second film layer 112 is preferably in the range of 60 to 100% by mass, more preferably in the range of 80 to 100% by mass, and in the range of 90 to 100% by mass. Is more preferable. When the content of the second resin in the second film layer 112 is in the range of 60 to 100% by mass, the crystals constituting the resin can be oriented in a specific direction and high barrier properties can be expressed.

  Examples of the second resin include crystalline resins, and specifically, polyolefin resins such as polyethylene resin, polypropylene resin (PP resin), and polymethylpentene resin; nylon 6 resin, nylon 66 resin, and the like. Polyamide resin; Polyester resin such as polyethylene terephthalate resin, polybutylene terephthalate resin, polybutylene succinate resin, polyethylene-2,6-naphthalate resin; polyacetal resin; polylactic acid resin; polyglycolic acid resin; polycaprolactone resin; Examples thereof include a copolymer resin containing a monomer that forms the resin. One or more of these can be used in combination.

  Among these, the second resin is preferably a polyolefin resin, more preferably polyethylene, and even more preferably high density polyethylene (HDPE). Since polyethylene is a general-purpose resin among polyolefin-based resins, cost reduction is possible. Moreover, a higher barrier property can be expressed by orienting polyethylene.

  The second resin included in the second film layer 112 may be only one kind or two or more kinds, and when there are two or more kinds, the combination and ratio thereof can be arbitrarily selected according to the purpose.

The component other than the second resin included in the second film layer 112 may be a resin component or a non-resin component, but when it is a resin component, it is a resin other than the first resin. Preferably there is.
Among the components other than the second resin, examples of the non-resin component include the additives as components other than the first resin.

  Components other than the second resin included in the second film layer 112 may be only one type or two or more types, and in the case of two or more types, the combination and ratio thereof are arbitrarily selected depending on the purpose. it can.

The number of laminated second film layers 112 in the barrier layer 11 is preferably 50 to 5000, more preferably 250 to 4500, such as 300 to 4000, 450 to 3500, 600 to 3000, 750. Any of 2500 and 750-2000 may be sufficient.
In addition, the number of layers of the 2nd film layer 112 can be confirmed with the same method as the case of the number of layers of the 1st film layer 111 mentioned above.

In the barrier layer 11, the number of layers of the first film layer 111 and the number of layers of the second film layer 112 may be the same or may differ by 1 (the number of layers of the first film layer 111 is The number of layers of the second film layer 112 may be one more, or the number of layers of the second film layer 112 may be one more than the number of layers of the first film layer 111).
For example, the number of barrier layers 11 is preferably 100 to 10,000.

The average thickness per layer of the second film layer 112 is preferably 10 to 1000 nm, more preferably 10 nm or more and less than 500 nm, further preferably 10 to 490 nm, and more preferably 10 to 400 nm. Particularly preferred is 15 to 300 nm, and it may be, for example, any of 15 to 250 nm, 15 to 200 nm, 15 to 150 nm, and 15 to 120 nm.
Here, the “average thickness per layer of the second film layer 112” means the total thickness of all the second film layers 112 existing in the barrier layer 11. The value divided by the number of layers of the second film layer 112 ([total value of the thickness of all the second film layers 112 present in the barrier layer 11] / [second film layer 112 present in the barrier layer 11) Number of layers]).

  The combination of the first resin and the second resin used in combination in the multilayer film 1 is preferably a polyolefin resin and a polyolefin resin. Examples of such a combination include a combination of polypropylene and high density polyethylene.

  The sum of the thickness of the barrier layer 11, in other words, the total thickness of the first film layer 111 and the total thickness of the second film layer 112 is preferably 10 to 500 μm. The thickness is more preferably 400 μm, still more preferably 20 to 350 μm, and particularly preferably 25 to 300 μm. When the thickness of the barrier layer is 10 to 500 μm, crystals constituting the resin are oriented in a specific direction, and high barrier properties can be expressed.

  The curl prevention property is presumed to be affected by both the thickness of the barrier layer 11 and the number of the first film layer and the second film layer constituting the barrier layer 11. That is, by increasing the thickness of the barrier layer 11, the rigidity of the barrier layer can be improved, and the curl prevention property can be improved. Or increase the number of layers of the first film layer and the second film layer in the barrier layer 11 (in other words, reduce the average thickness per layer of the first film layer 111 and the second film layer 112). Thus, the rigidity of the barrier layer can be improved, and the anti-curling property can be improved.

  Since the barrier layer 11 has low water vapor permeability, the multilayer film 1 exhibits excellent water vapor barrier properties without performing a stretching process during its production. In the first film layer 111, the first resin is oriented in a direction parallel to the surface of the first film layer 111. In the second film layer 112, the second resin is the second film layer. In order to allow water vapor to pass through the first film layer 111 and the second film layer 112 respectively by being oriented in a direction parallel to the surface of 112, in the first film layer 111 and the second film layer 112. It is assumed that this is because it is necessary to pass through a long route.

<First outer layer>
Each of the first outer layers 12 is preferably a resin layer containing the first resin and an elastomer.
The first outer layer 12 may be laminated on both surfaces of the barrier layer 11. In the multilayer film 1, the barrier layer 11 is protected by the pair of resin layers. The first outer layer 12 imparts excellent flexibility to the multilayer film 1.

  Examples of the elastomer include olefin-based elastomers, α-olefin copolymers, and low density polyethylene. Of these, olefin elastomers are preferred. Thereby, the flexibility of the first outer layer can be dramatically improved, and at the same time, the transparency can be maintained or improved.

  Specific examples of the olefin elastomer include Notio SN0285 manufactured by Mitsui Chemicals. Specific examples of the α-olefin copolymer include Tafmer XM7080 manufactured by Mitsui Chemicals.

  20 mass% or more is preferable with respect to the 1st outer layer 12, for example, and, as for content of the elastomer in the 1st outer layer 12, 60 mass% or more is more preferable. Thereby, the softness | flexibility excellent in the multilayer film 1 can be provided.

  The total thickness of the pair of unstretched first outer layers 12 is preferably in the range of 5 to 125 μm, more preferably in the range of 10 to 125 μm, and still more preferably in the range of 20 to 125 μm. Thereby, the softness | flexibility excellent in the multilayer film 1 can be provided.

<Second outer layer>
The second outer layer 13 may be laminated on both surfaces of the first outer layer 12. The second outer layer 13 imparts heat resistance and moldability to the multilayer film 1.

  Each of the second outer layers 13 is preferably a resin layer containing the first resin. Thereby, the heat resistance and the moldability which were excellent in the multilayer film 1 can be provided.

  60 mass% or more is preferable with respect to the 2nd outer layer 13, for example, and, as for content of the polyolefin resin in the 2nd outer layer 13, 80 mass% or more is more preferable. Thereby, the heat resistance and the moldability which were excellent in the multilayer film 1 can be provided.

  The total thickness of the pair of unstretched second outer layers 13 is preferably in the range of 5 to 125 μm, more preferably in the range of 10 to 110 μm, and still more preferably in the range of 15 to 100 μm. Thereby, the heat resistance and the moldability which were excellent in the multilayer film 1 can be provided.

  The total thickness of the multilayer film 1 is preferably in the range of 20 to 750 μm, more preferably in the range of 50 to 600 μm, and still more preferably in the range of 100 to 500 μm. The tablet storage part of a package can be formed because the total thickness of the multilayer film 1 is below the said upper limit. Moreover, the barrier property for protecting the content can be provided because the total thickness of the multilayer film 1 is more than the said lower limit.

<Other layers>
The multilayer film 1 may include other layers in addition to the barrier layer 11, the first outer layer 12, and the second outer layer 13 as long as the effects of the present invention are not impaired. The other layers are not particularly limited and can be arbitrarily selected according to the purpose.
However, in the multilayer film 1, for example, as shown in FIG. 1, the first outer layer 12 is preferably provided in direct contact with the barrier layer 11, and the second outer layer 13 is in direct contact with the first outer layer 12. Are preferably provided.

<< Method for producing multilayer film >>
The multilayer film of the present invention can be produced, for example, by the following method.
That is, first, a first laminated film having a multi-layer structure for finally forming a laminated structure of the first film layer 111 and the second film layer 112 is produced. More specifically, the first laminated film includes a first resin-containing layer that finally becomes the unstretched first film layer 111 and a second resin layer that finally becomes the unstretched second film layer 112. The resin-containing layer is alternately and repeatedly stacked. As the first laminated film, for example, the two outermost layers are both first resin-containing layers, and the number of second resin-containing layers is only one than the number of first resin-containing layers. Contrary to this, the outermost two layers are both the second resin-containing layers, and the number of the first resin-containing layers is the number of the second resin-containing layers. And a multi-layer structure having one less than the number of layers. However, the first laminated film is not limited to these.

Next, after cutting the first laminated film in a direction perpendicular to the surface, the two obtained first laminated films are further laminated in the thickness direction to obtain a second laminated film. Make it.
Next, the second laminated film is stretched and expanded in a direction parallel to the surface, and then the expanded second laminated film is cut and laminated in the same manner as the first laminated film. Three laminated films are produced.
Thereafter, the barrier layer 11 is produced by repeatedly performing such expansion, cutting and lamination of the laminated film. For example, as the first laminated film, when the outermost two layers are both the first resin-containing layer, the first laminated film is laminated to produce a second laminated film. In addition, the two first resin-containing layers that are the outermost layers that are superposed form an apparent first resin-containing layer in the second laminated film. The same applies to the production of the laminated film after the second laminated film and the barrier layer 11. However, the barrier layer 11 shown here is only an example in the multilayer film 1 of the present invention.

The first laminated film may be formed by using, for example, several extruders to melt and extrude a raw material resin or the like, a coextrusion T-die method such as a multi-manifold method, an air-cooling type or a water-cooling type co-extrusion. It can be produced by an inflation method or the like.
In the above-described manufacturing method, the production of the target barrier layer from the subsequent first laminated film can be performed using a multiplier.

Next, for example, the components of the first outer layer 12 such as an elastomer and a first resin are dry blended or melt-kneaded, and the molten resin is put into another feed block by several different extruders. Melt extrusion to form a film. The formed film is used as the first outer layer 12.
Next, the 1st outer layer 12 is laminated | stacked on both surfaces of the barrier layer 11 mentioned above.

Next, for example, the constituent components of the second outer layer 13 such as the first resin are melted, and the melted resin is melt-extruded into another feed block by several different extruders to form a film. To do. The formed film is used as the second outer layer 13.
Next, the second outer layer 13 is laminated on the surfaces (exposed surfaces) of the pair of first outer layers 12 described above.

Next, by cooling and solidifying the laminated film with a cooling roll, the crystal orientation of the laminated film is controlled, and the multilayer film 1 is produced.
The multilayer film 1 produced according to this embodiment is excellent in molding processability because the film is not stretched.

<< Packaging body >>
The package of the present invention includes the multilayer film of the present invention described above.
Since the package of the present invention uses the multilayer film of the present invention having excellent water vapor barrier properties, it has excellent moisture resistance.
Moreover, this multilayer film can produce the test piece by which curling was suppressed as above-mentioned, and since the package of this invention uses such a multilayer film, it can implement | achieve the outstanding curl prevention property. .
The package of the present invention is suitable for use in various applications where moisture and anti-curl properties are required. For example, the package is suitable as a packaging bag or packaging container for packaging foods, pharmaceuticals, and the like.

FIG. 2 is a perspective view schematically showing an embodiment of the package of the present invention, and FIG. 3 is a cross-sectional view taken along line II of the package shown in FIG.
In FIG. 2 and subsequent figures, the same components as those shown in the already explained figures are given the same reference numerals as those in the already explained figures, and their detailed explanations are omitted.

The package 10 shown here includes a molded film 2 and a cover film 101. And the projection part 2c which comprises the accommodating part 10a of the package 10 is formed in the molded film 2. As shown in FIG. The molded film 2 is a molded body of the above-described multilayer film (for example, the multilayer film 1 shown in FIG. 1).
The package 10 is a PTP film (packaging container) as a blister pack, and the tablet 102 can be sealed and stored in the storage unit 10a.

  One surface (which may be referred to as “second surface” in this specification) 2b of the molded film 2 is referred to as one surface (in this specification, “first surface”) of the cover film 101. Is bonded to 101a. However, the molded film 2 protrudes to the other surface (sometimes referred to as “first surface” in this specification) 2a side in a part of the region, and the second surface of the protruding portion 2c. 2b is not bonded to the first surface 101a of the cover film 101, and the storage portion 10a is formed by the second surface 2b of the molded film 2 and the first surface 101a of the cover film 101. .

  Examples of the material of the cover film 101 include aluminum.

  A slit 10 b is formed in the molded film 2 and the cover film 101. The slit 10b is an arbitrary configuration and may not necessarily be formed. However, by forming the slit 10b, the packaging body 10 can be easily divided for each specific accommodation number of the tablets 102 in the storage portion 10a. Therefore, the convenience of the package 10 is improved.

  Here, although the outer shape of the storage unit 10a is a truncated cone as the package 10, the outer shape of the storage unit 10a is not limited to this, and depends on the shape of the tablet 102 that is a storage object. Can be selected arbitrarily. For example, the outer shape of the storage portion 10a may be a polygonal shape such as a triangle, a quadrangle, a pentagon, a hexagon, or the like when viewed in plan so that the packaging body 10 is looked down from the molding film 2 side. Etc.

  In addition, here, the packaging body 10 is shown as having eight storage portions 10a, but the number of the storage portions 10a is not limited to this, and may be one, or two or more (however, Except for the case of eight).

<< Method for manufacturing package body >>
The package of the present invention can be produced by bonding the multilayer films or the multilayer film and another film or the like so as to form the intended storage portion using the multilayer film.

For example, the package 10 shown in FIGS. 2 and 3 can be manufactured using a known PTP packaging machine.
More specifically, first, a projecting portion is formed on the multilayer film 1 by vacuum forming, pressure forming, plug forming, or the like, to produce a formed film 2.
Next, after filling the protrusions 2 c of the molded film 2 with the tablets 102 that are the objects to be stored, the cover film 101 is overlapped with the multilayer film 1, and the molded film 2 and the cover film 101 are bonded.
Next, the slit 10b is formed in the molded film 2 and the cover film 101 using a sewing blade or a half-cut blade, if necessary.
Thus, the package 10 is obtained.

  Hereinafter, the present invention will be described in more detail with reference to specific examples. However, the present invention is not limited to the following examples.

<Manufacture of multilayer film>
[Example 1]
Polypropylene (“E122V” manufactured by Prime Polymer, Inc., sometimes referred to as PP) is used as the first resin, and high-density polyethylene (“3300F” manufactured by Prime Polymer Co., Ltd., sometimes referred to as HDPE) is used as the second resin. Each prepared. Then, using an extruder (manufactured by SunNT Co., Ltd., “SNT40-28 model number”), the first resin and the second resin are each melted at 250 ° C., and using a feed block, The outermost layer has a configuration in which a polypropylene layer that finally becomes an unstretched first film layer and a high-density polyethylene layer that finally becomes an unstretched second film layer are alternately and repeatedly laminated. The two layers were both polypropylene layers, and a five-layer molten laminate (the above-mentioned first laminated film) composed of three layers of the polypropylene layer and two layers of the high-density polyethylene layer was produced.
Next, using a multiplier, the obtained five-layer molten laminate was cut into two pieces, and these two molten laminates after the cutting were further laminated to form a nine-layer molten laminate (the above-mentioned first laminate). 2 laminated film) was produced.
Next, the obtained 9-layer molten laminate was expanded and expanded in a direction parallel to the surface thereof, and then expanded in the same manner as in the case of the 5-layer molten laminate (first laminated film). The nine-layer melt laminate was cut and laminated to prepare a 17-layer melt laminate (the above-mentioned third laminate film).
Thereafter, the same procedure is used to repeat the expansion, cutting and lamination of the molten laminate, and the unstretched first film layer and the unstretched second film layer are alternately and repeatedly laminated. A barrier layer of 2049 layers composed of 1025 layers of the first film layer and 1024 layers of the second film layer was produced.

  Then, an olefin elastomer (“Notio SN-0285” manufactured by Mitsui Chemicals) and the same first resin used for the production of the barrier layer are dry blended or melt-kneaded, and several different extrusions are used. The melted resin was melt extruded into another feed block by a machine to form a film (first outer layer) containing olefin elastomer and polypropylene.

  Next, the same first resin used for the production of the barrier layer is melted, and the melted resin is melt-extruded into another feed block by several different extruders from the above, and a film containing polypropylene ( A second outer layer) was formed.

Next, the first outer layer obtained above is laminated on both sides of the 2049 barrier layer, and the second outer layer obtained above is further laminated on both sides, thereby producing a 2053 layer molten laminate. did. Furthermore, the multilayer film of Example 1 having the structure shown in FIG. 1 was produced by co-extrusion of the molten laminate using a die.
The thickness of the obtained multilayer film is 300 μm, of which the thickness of one first outer layer is 20 μm, the thickness of one second outer layer is 10 μm, and the thickness of the barrier layer is 240 μm. Met. That is, the number of first film layers was 1025, and the average thickness of each first film layer was 100 nm. Moreover, the number of layers of the second film layer was 1024, and the average thickness per layer of the second film layer was 150 nm.

[Comparative Example 1]
Polyvinyl chloride (“S-1008” manufactured by Kaneka Corporation, sometimes referred to as PVC) and polychlorotrifluoroethylene (“Akler” manufactured by Honeywell, Inc., sometimes referred to as PCTFE) are coextruded in this order. A multilayer film of Comparative Example 1 was produced by molding.
The resulting multilayer film having a two-layer structure had a thickness of 223 μm, of which the polyvinyl chloride layer had a thickness of 200 μm and the polychlorotrifluoroethylene layer had a thickness of 23 μm.

[Comparative Example 2]
A multilayer film of Comparative Example 2 was produced by coextrusion of polyvinyl chloride and polychlorotrifluoroethylene in this order.
The thickness of the obtained multilayer film was 301 μm, and among these, the thickness of the polyvinyl chloride layer was 250 μm, and the thickness of the polychlorotrifluoroethylene layer was 51 μm.

<Manufacture of single layer film>

[Comparative Example 3]
By extruding the polyvinyl chloride, a single layer film composed of an unstretched polyvinyl chloride layer having a single layer structure was produced.
The thickness of the obtained single layer film was 250 μm.

[Comparative Example 4]
A single-layer film made of unstretched polypropylene having a single-layer structure was produced by extrusion-molding polypropylene (“E122V” manufactured by Prime Polymer Co., Ltd., sometimes referred to as PP).
The thickness of the obtained single layer film was 300 μm.

<Evaluation of multilayer film and single layer film>
About the multilayer film and single layer film which were obtained above, evaluation of the following item was performed by the following method. The results are shown in Table 1. In addition, description of "-" in the column of the evaluation result in Table 1 means that the item has not been evaluated.

  A test piece provided with the multilayer film produced in each example and each comparative example was produced. Specifically, first, a roll-shaped multilayer film having a width of 100 mm was produced. Using the blister packaging machine (“FBP-300E”, manufactured by CKD), two rows of tablet storage portions each protruding in the thickness direction were formed on the multilayer film. And the said multilayer film was pierce | punched into the rectangle whose plane shape is a magnitude | size of 40 mm x 95 mm, and the 1st test piece was produced. The tablet storage part was a concave part having an inner diameter of 10.0 mm and a depth of 4.5 mm.

(Pocket moisture permeability)
Each of the 10 tablet storage parts of the first test piece is filled with zeolite (φ 7.0 mm × 3.0 mm), and the opening of the tablet storage part is sealed using an aluminum cover film, and the second test. I got a piece. The change in the weight of the zeolite after the second test piece was allowed to stand for 24 hours in an atmosphere of 40 ° C. and 90% RH was measured. The pocket moisture permeability was evaluated by obtaining the water vapor permeation amount of the tablet storage part of the second test piece from this weight change.

(Sheet moisture permeability)
The moisture permeability of the sheet was evaluated by measuring the amount of water vapor permeation of the multilayer film produced in each example and comparative example. The amount of water vapor permeation was measured in accordance with the method described in JIS K7129 (Method B) using PERMATRAN-W (registered trademark) 3/33 manufactured by MOCON (moisture absorption condition: 40 ° C./90%).

(Anti-curling property)
An aluminum film having a thickness of 17 μm was bonded to the surface of the first test piece opposite to the protruding side of the tablet storage portion to obtain a third test piece. In a room temperature environment, the third test piece was allowed to stand on a flat surface with the tablet storage portion facing upward. The average value (mm) of the height from the plane of the four corners of the third test piece was measured. When the average value of the height from the plane was small, it was evaluated that the curl prevention property was good.

  Regarding the anti-curl property, the multilayer film of Example 1 showed a sheet moisture permeability that was reduced as much as the hard multilayer films of Comparative Examples 1 and 2 containing fluorine, which was significantly higher than the single-layer film of Comparative Example 3. A reduced sheet moisture permeability was shown. In addition, the multilayer film of Example 1 exhibited a curl height that was significantly reduced as compared with the single-layer film of Comparative Example 4.

  The present invention can be used for a package used at the time of storage of food, medicine, and the like.

DESCRIPTION OF SYMBOLS 1 ... Multilayer film 2 ... Molded film 2a ... 1st surface of a molded film 2b ... 2nd surface of a molded film 2c ... Projection part of a molded film 11 ... Barrier layer 111 ... -1st film layer 112 ... 2nd film layer 12 ... 1st outer layer 13 ... 2nd outer layer 10 ... Packaging body 10a ... Storage part 10b ... Slit of packaging body 101 ... Cover film 101a ... First surface of cover film 102 ... Tablet

Claims (14)

The planar shape is rectangular, the size is 40 mm × 95 mm, and there are two rows of 5 tablet storage portions per row protruding in the thickness direction. The tablet storage portion has an inner diameter of 10.0 mm and a depth. A test piece which is a recess of 4.5 mm and a 17 μm-thick aluminum film is bonded to the surface opposite to the protruding side of the tablet storage part, and the test piece is placed under normal temperature in the tablet When the storage part is faced up and left on a plane, the average value of the height from the plane of the four corners of the test piece is 4.0 mm or less,
Sheet moisture permeability is 0.3 g / m ² · day or less,
A barrier layer in which an unstretched first film layer containing a first resin and an unstretched second film layer containing a second resin different from the first resin are alternately and repeatedly laminated;
A multilayer film in which at least one of the first resin and the second resin is a polyolefin resin. The average thickness per layer of the first film layer is 10 to 1000 nm,
The multilayer film of Claim 1 whose average thickness per layer of the said 2nd film layer is 10-1000 nm. Furthermore, a multilayer film comprising a pair of unstretched first outer layers sandwiching the barrier layer,
The multilayer film according to claim 1 or 2, wherein each of the first outer layers is a resin layer containing the first resin and an elastomer.   The multilayer film according to claim 3, further comprising a pair of unstretched second outer layers sandwiching the pair of unstretched first outer layers.   The multilayer film as described in any one of Claims 1-4 whose lamination number of the said 1st film layer in the said barrier layer is the range of 50-5000.   The multilayer film according to claim 4 or 5, wherein each of the second outer layers is a resin layer containing the first resin.   The multilayer film as described in any one of Claims 1-6 whose thickness of the said barrier layer is the range of 10-500 micrometers.   The multilayer film according to any one of claims 3 to 7, wherein a total thickness of the pair of unstretched first outer layers is in a range of 5 to 125 µm.   The multilayer film according to any one of claims 4 to 8, wherein a total thickness of the pair of unstretched second outer layers is in a range of 5 to 125 µm.   The multilayer film according to any one of claims 3 to 9, wherein the elastomer is an olefin-based elastomer.   The multilayer film according to any one of claims 1 to 10, wherein the first resin and the second resin are polyolefin resins.   The multilayer film according to any one of claims 1 to 11, wherein the first resin is polypropylene.   The multilayer film according to any one of claims 1 to 12, wherein the second resin is high-density polyethylene.   A package comprising the multilayer film according to any one of claims 1 to 13.

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