JPH1179241A - Sheet for blister pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure packaging and to facilitate to take out an article by forming the titled sheet of a flat film made of a styrene resin and a molded film consisting of a thermoplastic resin such as polyamide and polycarbonate on which a number of recessed parts for storing articles are separately formed each with a specified thickness. SOLUTION: This sheet for blister pack consists of a flat film 1 and a molded film 2 and the flat film 1 is a film made of a styrene resin with a thickness of 20-70 μm and the molded film 2 has a thickness in a range of 60-200 μm which is the same as or larger than the thickness of the flat film and is made of a polyamide, a polycarbonate, a thermoplastic polyester resin or an olefin resin and a number of recessed parts for storing articles are separately formed thereon. In addition, a heat-weldable thin film made of a low mol.wt. ethylene- vinyl acetate copolymer, ethylene-maleic acid copolymer, etc., may be formed on one face of the flat film 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blister pack sheet.

[0002]

2. Description of the Related Art A blister pack is a packaging form used for packaging tablets and the like. For example, a blister pack is provided with a number of independent foam-like depressions in a plastic film, a tablet is placed in each depression, and an aluminum foil is laminated thereon and stuck, and a tablet is placed in each depression. It is in the form of being confined and packaged individually. Blister packs are widely used because it is convenient to take out and take tablets one by one.

As described above, a blister pack requires a film having a depression (hereinafter referred to as a molded film) and a flat film (hereinafter referred to as a flat film). Of these, plastic films such as polypropylene are used for molded films, but flat films must be easily ruptured, so plastic films have not been used and paper or aluminum foil has been used. Used exclusively.

[0004] Blister-packing of medical supplies such as tablets, injection needles and syringes has been performed. Before blister-packing such medical supplies, the formed film and the flat film are subjected to a sterilization treatment. As a method of the sterilization treatment, a method of treating with an ethylene oxide gas, an ultraviolet ray, an electron beam or γ
A method of irradiating a line or the like is performed. Among them, the method of sterilizing with ethylene oxide gas (hereinafter referred to as gas method) requires special care in handling ethylene oxide gas, and is difficult to handle. (Hereinafter referred to as irradiation method).

[0005] In the blister pack method using paper for a flat film, there is a problem that if sterilized by a gas method, the paper absorbs ethylene oxide, causing damage after packaging. Also, when paper was used, when the user broke the pack and took out the object, the paper became powder and could be scattered.

Therefore, aluminum foil is often used for the flat film. However, when attempting to sterilize an aluminum foil by the irradiation method, the aluminum foil does not transmit light, so it is necessary to irradiate the aluminum foil one by one, so that there is a disadvantage that sterilization cannot be performed efficiently.

[0007]

The inventor of the present invention has noticed the above-mentioned problems associated with the blister pack, and has sought to develop a blister pack method free of the above-mentioned problems. The inventor has sought to provide a blister pack sheet that can be efficiently sterilized by an irradiation method.

[0008]

Means for Solving the Problems Up to now, plastic films have been used for forming blister packs, but plastic films have not been used for flat films. I'm not sure why,
This is probably because using a plastic film as the flat film made it difficult to break the flat film.

[0009] The inventor of the present invention has proposed various plastics having various properties. Therefore, if a plastic having inherently fragile properties is selected as a flat film and this is used as a thin film, We thought we could break the old idea as described above. In addition, the inventor of the present invention believes that if a plastic having inherently difficult to break properties is selected and used for a formed film as compared with a flat film, the above-mentioned conventional idea can be reliably broken. Was.

Specifically, the inventor of the present invention has made a flat film made of styrene resin and having a thickness of 20 to 70 μm, and a molded film made of polyamide, polycarbonate, thermoplastic polyester resin, or olefin resin. It has been found that the above problem can be solved by setting the thickness within the range of 60 to 200 μm and equal to or greater than the thickness of the flat film. In addition, it has been found that it is effective to apply a fusible thin film to at least one of the two films on the adhesive surface. The present invention has been completed based on such knowledge.

The present invention comprises a flat film and a formed film, wherein the flat film is a styrene resin film having a thickness of 20 to 70 μm, and the formed film has a thickness of 60 to 200 μm. It has a thickness equal to or greater than the thickness of the film, is made of polyamide, polycarbonate, thermoplastic polyester resin, or olefin resin, and is formed by separating a number of depressions for accommodating articles. A blister pack sheet is provided.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway perspective view showing a use state of a blister pack sheet according to the present invention. FIG. 2 is a perspective view showing a state when the blister pack is formed using the blister pack sheet shown in FIG. FIG. 3 is a perspective view showing a state when articles are taken out of the blister pack shown in FIG. FIG. 4 is a side view showing a stacked state of the blister pack shown in FIG.

In FIG. 1, 1 is a flat film,
Reference numeral 2 denotes a molded film, and reference numeral 3 denotes an injection needle placed in a container, which is an article to be blister-packed. The blister pack sheet according to the present invention comprises a flat film 1 and a formed film 2.

The flat film 1 is made of a styrene resin. The styrene-based resin includes not only a homopolymer of styrene, but also a copolymer of styrene and another monomer copolymerizable therewith. The copolymer means one in which styrene accounts for 50 mol% or more. Other monomers include, for example, acrylonitrile and butadiene. Among them, it is preferable to use a homopolymer of styrene.

The flat film 1 has a thickness of 20 to 70 μm. Among them, those having a thickness as small as possible are preferable. This film can be made by extrusion. A fusible thin film is formed on one surface of the flat film 1.

A fusible thin film is a thin film made of a resin that, when heated or sonicated, melts and adheres to each other or to another object. This thin film can be formed by melting and applying a fusible resin. The fusible resin is, for example, a low molecular weight ethylene / vinyl acetate copolymer, an ethylene / maleic acid copolymer, or the like. This is also called modified polyethylene. The thickness of the thin film is preferably as thin as possible.
It is of the order of μm.

The molded film 2 has a thickness of 60 to 200 μm.
m and has a thickness equal to or greater than the thickness of the flat film. The molded film 2 is made of polyamide, polycarbonate, thermoplastic polyester resin, or olefin resin.

Among them, the polyamide has an amide bond -C
It is a polymer having ONH- and is a resin generally called nylon. Polycarbonate is a polymer having a carbonate bond -OC (= O) -O in its main chain. Thermoplastic polyester resin is generally a PET (PE
T) is a resin referred to as a high molecular weight resin obtained by causing an esterification reaction between an aromatic dibasic acid such as terephthalic acid and an aliphatic alcohol such as ethylene glycol. It is a linear polyester. The olefin-based resin means a homo- or copolymer of a lower olefin such as ethylene, propylene, and butene-1. Among these resins, it is preferable to use polyamide.
The reason is that the use of polyamide makes it easy to form deep depressions.

The molded film 2 is formed with a large number of recesses for accommodating articles. That is, as shown in FIG. 1, a large number of depressions are formed just enough to accommodate the injection needles 3 one by one. Since the depression is formed by vacuum forming, compression molding or pressure forming of the film, when viewed from the side opposite to the depression, the protrusion 2 is formed as shown in FIG.
It looks like 1.

A fusible thin film is formed on a flat portion located on the opening side of the depression of the molded film 2. Here, the surface 22 located on the opening side of the dent is a surface on the invisible side of the molded film 2 in FIG. That is, the protrusion 21
This is the surface on the opposite side to the protruding surface. The fusible thin film may be formed on the entire surface 22, but is preferably formed on a plane other than the recess.

The fusible thin film to be formed on the molded film 2 is of the same type as the fusible thin film to be formed on the flat film 1. The fusible thin film on the molded film 2 and the fusible thin film on the flat film 1 may have exactly the same composition, or may have different compositions. Further, the formed film 2 and the flat film 1 may have the fusible thin film formed only on one of them, and may not be formed on the other.

The blister pack sheet according to the present invention comprises a flat film 1 and a molded film 2 as described above.
It consists of: In this sheet, as shown in FIG. 1, one article is placed in each recess of the molded film 2 and its surface is covered with the flat film 1, and the adhesiveness between the flat film 1 and the molded film 2 is increased. By laminating with a thin film interposed, the flat part of the molded film 2 is brought into close contact with the flat film 1, and the flat part is heated or ultrasonic waves are applied to the flat part,
Used to form a blister pack by fusing a fusible thin film.

The blister pack sheet according to the present invention is used to blister pack one injection needle at a time, for example, as shown in FIG. In FIG. 2, a flat film 1 is fused to a molded film 2 at a flat portion to be integral with each other.
Are housed one by one and sealed. That is, the fusible thin film on the flat film 1 and the fusible thin film on the molded film 2 are fused and united on the fusion surface 4 to form an airtight package. Flat film 1 between depressions
And a perforation provided penetrating through the molded film 2, and it is easy to separate only one recessed portion as necessary.

As shown in FIG. 2, the blister-packed injection needle is cut along perforations 5 to take out the package for one injection needle, and a part of the pack is bent as shown in FIG. By breaking the flat film 1, the injection needle 3 contained in the container can be easily taken out.

According to the present invention, the molded film 2 is composed of a laminated body of a plurality of films made of different resins, and one of the plurality of films is made of a barrier resin having a low moisture or oxygen permeability. Thus, the blister pack can be made to have a barrier property. Examples of the barrier resin include EVOH (a copolymer of ethylene and vinyl acetate obtained by saponifying vinyl acetate) and MX nylon (a polyamide resin obtained by co-condensing meta-xylylenediamine and adipic acid). ) Can be used.

In this case, the reason why the blister pack can be made to have a barrier property only by giving the molded film 2 a barrier property is as follows. The blister packs as shown in FIG. 2 are stored or transported in a stack, for example, as shown in FIG. More specifically, one blister pack A in FIG. 4 is closely contacted with the same type of blister pack B back to back, in other words, the flat film side is brought into contact, and the phase of the projection 21 is shifted. The same type of blister pack C is placed in the same direction as the blister pack A. (Specifically, the blister pack C is placed facing the blister pack B, and the protrusion 21 of the blister pack C is 21), and the next blister pack D is laid in the same direction as the blister pack B and is stacked closely back to back with the blister pack C. In such a state, only the molded film 2 comes into contact with air, and the flat film 1 hardly comes into contact with air. Therefore, the blister pack can be made to have a barrier property only by giving the molded film 2 a barrier property. Note that the phase shift of the projections 21 can be easily performed by attaching a half-end portion P to one end of each blister pack.

[0027]

According to the present invention, the blister pack sheet is composed of a flat film and a formed film, the flat film is formed of a styrene resin film having a thickness of 20 to 70 μm, and the formed film is formed of a thin film. 60 ~
Within the range of 200μm and equal to or greater than the thickness of the flat film, and because the molded film is made of polyamide, polycarbonate, thermoplastic polyester resin, or olefin resin, the flat film is It is easier to tear than molded film. Also, a large number of dents for accommodating articles are formed separately in the molded film, articles to be packaged are put in the dents, and a fusible thin film is placed between the flat film located on the opening side of the dents and the flat film. The fusible thin film is melted by applying heat or ultrasonic waves by interposing them in close contact with each other to easily perform blister pack.

At this time, if a fusible thin film is formed in advance on one surface of the flat film or on a plane portion located on the opening side of the dent in the molded film, the blister pack becomes even easier.

The blister pack thus obtained does not break the flat film even if it is transported or stocked in a pile, so that the packaging is reliably maintained. In particular,
When transported or stocked as shown in FIG. 4, a large amount of blister packs can be stored in a narrow space,
Further, the blister pack can have barrier properties. On the other hand, if one of the packages is taken out and the pack is twisted so that the corner of the article protrudes from the flat film, the flat film breaks immediately and the article can be taken out.
Thus, because of the ease of removal of the article, the needle can be connected to the syringe at the same time as, for example, removal from the blister pack, so that the operation can be performed quickly.

Furthermore, since the blister pack sheet according to the present invention is made of a synthetic resin, it has the property of transmitting electron beams, ultraviolet rays, γ rays, etc.
Therefore, sterilization can be efficiently performed by the irradiation method.
This is particularly convenient for packaging medicines or medical aids. The present invention provides such benefits.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a use state of a blister pack sheet according to the present invention.

FIG. 2 is a perspective view when a blister pack is formed using the blister pack sheet shown in FIG.

FIG. 3 is a perspective view showing a state when articles are taken out of the blister pack shown in FIG. 2;

4 is a side view showing a stacked state of the blister pack shown in FIG.

[Description of Signs] 1 Flat film 2 Molded film 3 Article (injection needle placed in container) 4 Fused surface 5 Perforation 21 Projection 22 Surface of molded film 2 located on opening side of depression

Claims (4)

[Claims] The flat film is a film made of a styrene resin having a thickness of 20 to 70 μm, and the formed film has a thickness of 60 to 2 μm.
Within the range of 00 μm, having a thickness equal to or greater than the thickness of the flat film, made of polyamide, polycarbonate, thermoplastic polyester resin, or olefin resin, the recess for housing the article is A blister pack sheet, which is formed by separating a large number of sheets. 2. The blister pack sheet according to claim 1, wherein a fusible thin film is formed on one surface of the flat film. 3. The blister pack sheet according to claim 1, wherein a fusible thin film is formed on a flat portion located on the opening side of the depression in the formed film. 4. A barrier, wherein a molded film is composed of a laminated body of a plurality of films made of different resins, and one of the plurality of films is made of a barrier resin having a low moisture or oxygen permeability. The blister pack sheet according to any one of claims 1 to 3, wherein the blister pack is provided with a property.