JPH0230954B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a PTP package that allows the contents to be seen through and prevents unauthorized use by children. Conventionally, in PTP packaging, the tearing part is made of aluminum foil provided with a heat seal lacquer or a heat sealable resin layer such as polyethylene. PTP packaging equipped with such aluminum foil is easy to break when taking out the contents,
Although it has excellent moisture resistance, it is more expensive than general-purpose plastic films such as polyethylene and polypropylene, and it is not transparent.
Additionally, PTP packaging made of aluminum foil has excellent breakability, allowing even children to easily remove the contents by simply pressing on it, which poses a risk of misuse of medicines. Moreover, aluminum foil
It is easily scratched and must be handled with care during printing, coating, etc., resulting in poor manufacturing efficiency. In view of these drawbacks, PTP packaging using plastic film instead of aluminum foil
It is described in Utility Model Publication No. 54-11256 and Utility Model Publication No. 54-11258. In this Japanese Utility Model Publication No. 54-11256, a molded sheet having a storage portion and a tear-resistant film are releasably adhered to each other. The ease of peeling of this package may vary depending on how it is handled.
Since the adhesion property is impaired and the sealing property is lost, there is a risk that the content protection effect such as moisture proofing will be lost. Furthermore, when the film is a single layer, there is a risk that the seal may be broken by an external impact. In Utility Model Publication No. 54-11258, a molded sheet having a storage part and an axially stretched film are heat-sealed, and the directionality of the uniaxially stretched film is used to make it easier to take out the contents, and it is only effective as an alternative to aluminum foil. cannot prevent unauthorized use by children,
It is unsuitable for use in packaging for drugs, etc. In both of these methods, the molded sheet and the sealing film are bonded together via an adhesive, which is undesirable because the adhesive containing residual solvent comes into contact with the contents. In view of these conventional drawbacks, the present invention is a PTP package that is made of transparent plastic film in both the molded sheet and the sealing film, and has the function of being unbreakable under normal conditions, but only during use. It is also a PTP package whose contents cannot be easily removed by children. The present invention will be described in detail below with reference to the drawings. First, as shown in FIGS. 1 and 2, a transparent plastic sheet made of polyvinyl chloride, polypropylene, polycarbonate, etc. is vacuum-formed, pressure-formed, etc. to form a housing part 2 into a desired shape such as a circle, ellipse, or oval. The containing part 2 of the molded sheet 1 having a molded sheet 1 is filled with contents 3 and is a PTP package formed by adhering a sealing film 10 with a part leaving an unbonded part 11.
The molded sheet 1 is preferably a plastic sheet with a thickness of 100 to 300 microns in terms of strength, and the sheet may be printed or colored to an extent that does not impede transparency. Further, the sealing film 10 maintains the sealing function during transportation, and also has a tear prevention layer 6 and a tear prevention layer 6 that prevent the seal from being easily broken by children or the like.
It consists of an opening layer 9 which is peeled off and then broken to take out the contents. This anti-breakage layer 6 is composed of a moisture-proof layer 4 having moisture-proof properties and a release layer 5 for facilitating separation from the unsealing layer 9. Moreover, the opening layer 9 includes a take-out layer 7 and a take-out layer 7 from which the contents can be taken out easily.
The adhesive layer 8 has adhesive properties on both the molded sheet 1 and the molded sheet 1. The moisture-proof layer 4 is made of a biaxially oriented polypropylene film, a biaxially oriented polyethylene terephthalate film,
Consists of films that have both mechanical strength and moisture resistance, such as biaxially stretched nylon film, polyvinylidene chloride coated polypropylene film, and cellophane. The release layer 5 is made of polyethylene, polypropylene,
It consists of polyolefin such as ethylene-vinyl acetate copolymer. The interlayer adhesion strength between the unsealing prevention layer 6 and the unsealing layer 9 is 10 to 100 g/15 mm. In addition, the take-out layer 7 is made of a plastic film having an elongation rate of 5% or less and an Izo impact strength of 5 kg cm/cm or less with a notch, in order to easily take out the contents by breaking the seal. , a styrene-acrylonitrile copolymer is used. The adhesive layer 8 is made of modified polyolefin. As mentioned above, when the package according to the present invention is used, after peeling off the anti-tearing layer 6 consisting of the moisture-proof layer 4 and the peeling layer 5, the tearing layer consisting of the take-out layer 7 and the adhesive layer 8 is ruptured to remove the contents. In order to take out, it is necessary to have an adhesive layer 8 such that the adhesive strength b between the release layer 7 and the adhesive layer 8 is greater than the adhesive strength a between the release layer 5 and the release layer 7. This adhesive layer 8 must have adhesive properties with the molded sheet 1 by means of adhesion with the extraction layer 7 and heat sealing. The modified polyolefin used for the adhesive layer 8 having such properties is a copolymer resin of ethylene and an unsaturated mono- or dicarboxylic acid or an ester or anhydride thereof, or a copolymer resin in which a part of these comonomers is replaced with vinyl alcohol. It is a copolymerized polyolefin. The selected comonomers include acrylic acid, methacrylic acid, maleic acid, maleic anhydride, itaconic anhydride, ethyl acrylate, methyl acrylate, methyl methacrylate, vinyl acetate,
Glycidyl acrylate or glycidyl methacrylate. The adhesive layer 8 is made of modified polyolefin alone, as well as
To this, a tackifier consisting of rosin, ester gum, cyclopentadiene, terpene resin, petroleum resin, alkylphenol resin, or any of these modified resins is applied to the modified polyolefin.
A resin containing 30% by weight can be used. Here, the adhesive strength b between the extraction layer 7 and the adhesive layer 8 is 105
g/15mm or more is required. This adhesive strength b is 105
If it is less than g/15 mm, the releasability from the tear-preventing layer 6 will be poor, and the difference in elongation between the take-out layer 7 and the adhesive layer 8 will cause interlayer peeling during opening, which will impede the unsealability. This adhesive layer 8 has a greater elongation than the extraction layer 7, so its thickness should be 20 μm or less. Release layer 5/ of sealing film 10 used in the present invention
The take-out layer 7/adhesive layer 8 is molded by coextrusion. Coextrusion molding methods include multi-manifold method, combine adapter method, multi-slot method, etc., using T-dies, or multilayer inflation methods using cylindrical dies. manufactured by The three-layer film and the moisture-proof layer 4 may be laminated by a known dry lamination method, or the three layers may be laminated on the moisture-proof layer 4 by a co-extrusion coating method. When taking out the contents from the package of the present invention, as shown in FIG.
After peeling off the anti-breakage layer 6 consisting of the moisture-proof layer 4 and peeling layer 5 of the sealing film 10 by bending the unbonded part 11 of the sealing film 10, the contents are pressed from the accommodating side to release the take-out layer 7 and the adhesive layer 8. The opening layer 9 consisting of the following is broken and the contents are taken out. In order to facilitate this seal breaking, the thickness of the extraction layer 7 and the adhesive layer 8 must be within a certain range.
It is preferable that the extraction layer 7 has a thickness of 10 to 100 μm, and the adhesive layer 8 has a thickness of 20 μm or less. In order to separate the moisture-proof layer 4 and release layer 5 of the sealing film 10 from the unsealing layer 9, in addition to providing an unbonded part at a position adjacent to the perforation 12 as shown in FIGS. 1 and 2, as shown in FIG. As shown in FIG.
A dividing line 13 such as a perforation may be provided on the side. When the package is divided into individual pieces by the perforations 12 and folded from the parting line 13, the sealing film 10 is formed.
The moisture-proof layer and release layer of the container are peeled off, and the contents can be taken out in the same manner as above. Since the package of the present invention has the above-described structure, it has become possible to see through the contents, which was difficult with packages using aluminum foil. In addition, the sealing prevention effect is obtained by laminating the sealing film, and compared to a single layer film, the sealing property is improved.
A package with excellent breakage resistance was obtained. This sealing film is laminated using a coextrusion method, which improves workability compared to the conventional dry lamination method or single-layer extrusion coating method, and allows for thinner films, so the opening layer used to take out the contents can be made thinner. can do. Furthermore, since the contact surface between the sealing film and the contents is manufactured as described above, there is no concern about residual solvent, and the package is excellent in terms of hygiene. Next, examples of the present invention will be described. Example Using the three-layer coextrusion device shown in Figure 6, three layers of two types of resin combinations as shown in Table 1 were injected into vinylidene chloride-coated polypropylene film (moisture-proof layer) (22μ) at a die temperature of 230°C. A sealing film was obtained by coextrusion coating with a vinyl acetate adhesive (Adcoat PR152 manufactured by Toyo Morton Co., Ltd.) such that the release layer was on the polypropylene film side.

[Table] Indicates index.
Next, a polyvinyl chloride sheet (VSS) with a thickness of 250 μ
-1207 (manufactured by Sumitomo Bakelite) was formed into a convex circular accommodating part by vacuum forming to form a molded sheet.
A cylindrical tablet was filled into the housing part of this molded sheet, and the adhesive layer of the sealing film was placed on the molded sheet and thermally bonded using a heat sealer at 150° C. and 3 kg/cm ² for 1 second. The sealing mold used here is provided with a cutting edge for perforating and a pressure relief section. Table 2 shows the performance of the sealing film and package obtained in this manner.

[Table] The interlayer adhesion strength is the strength of 180° peeling using Tensilon at a tensile speed of 300 mm/min. Bursting strength: A Müllen bursting tester (manufactured by Toyo Seiki) was used. As a result, the package of the present invention had good peelability of the sealing film and good unsealability of the opening layer.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention; FIG. 1 is a plan view, FIG. 2 is a sectional view taken along line A-A' in FIG. 1, FIG. Explanatory diagram when taking out the contents from the package shown in Figure 2, Figure 4
5 shows another embodiment of the present invention,
FIG. 4 is a plan view, FIG. 5 is a sectional view taken along line BB' in FIG. 4, and FIG. 6 is an explanatory diagram of a coextrusion die used in an embodiment of the present invention. 1... Molded sheet, 2... Storage part, 3... Contents, 4
...Moisture-proof layer, 5...Peeling layer, 6...Tear prevention layer, 7...Take-out layer, 8...Adhesive layer, 9...Tearing layer, 10...Sealing film, 11...Unbonded part, 12...Perforation, 13...
dividing line.

Claims (1)

[Claims] 1. A moisture-proof layer is laminated on the release layer side of a coextruded three-layer film consisting of an adhesive layer, a take-out layer, and a release layer on the opening side of a molded sheet having a housing section made of a see-through plastic sheet, and the sealing film is sealed. The adhesive layer is a copolymer resin of ethylene and unsaturated carboxylic acid or its ester or anhydride with a thickness of 20μ or less, the take-out layer is 10 to 100μ in thickness, has an elongation rate of 5% or less, and has an Izot impact strength. 5Kg・cm/
The peeling layer is made of either polystyrene or styrene-acrylonitrile copolymer with a notch size of 1 cm.
Consisting of polyolefin which is 10~100g/15mm
PTP packaging.