JPH0464266B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a plastic container for infusions and a method for manufacturing the same, and more particularly to a plastic container for infusions having a stopper containing a rubber stopper in the opening and manufacturing thereof. It is about the method.

PRIOR TECHNOLOGY When a rubber stopper comes into direct contact with an infusion, harmful components such as sulfur can be leached out, resulting in an extremely unsuitable hygiene situation.In general, the surface of the rubber stopper is coated and sealed to prevent direct contact with the infusion. There is. One method for this purpose is to form a synthetic resin film directly on the surface of the rubber stopper (Japanese Patent Publication No. 38-24545), and as shown in Figure 5, a thin film b is placed on the bottom surface of the rubber stopper a, and A technique is known in which the top surface c of the stopper is sealed by injection molding (Japanese Utility Model Publication No. 37396/1983).

Problems to be Solved by the Invention However, the above-mentioned prior art plastic containers for infusion still have problems. In other words, since the plastic container for infusion according to the prior art mentioned above is made of a synthetic resin coating, the thickness of the plastic container is inevitably thin, and the strength of the coating is low, so it is easily torn, exposing the rubber stopper, and impairing hygiene. In addition, in the latter conventional plastic container for infusion fluid, the rubber stopper a is sealed by injection molding through the thin film b, which prevents bacteria from entering from the outside. However, the infusion inside is a thin film b
The infusion liquid enters the rubber stopper very easily between the injection molded part C' and the rubber stopper, and the infusion liquid contains the above-mentioned harmful components of the rubber stopper, and the infusion liquid returns to the internal infusion liquid, impairing the hygiene of the internal infusion liquid. There was a problem that it was damaged.

On the other hand, the above-mentioned conventional method for manufacturing a plastic container for infusion has the following problems. In other words, the manufacturing method described above has the problem that since the surface of the rubber stopper is coated with synthetic resin, the coating process takes time, and it takes time to finish a particularly thick one. The latter manufacturing method involves injection molding by inserting a resilient rubber plug a, which has the problem that the rubber plug a is deformed by the injection pressure and the rubber decomposes by the heat of melting the synthetic resin.

Therefore, the plastic container for infusion of the present invention is
The sealing condition of the rubber stopper should not be compromised even with excessive use; in other words, the rubber stopper should have an extremely high sealing performance, so that the material covering the rubber stopper does not easily tear and the infusion solution does not easily enter. The purpose is to provide a plastic container for infusion having
In addition, the method for manufacturing a plastic container for infusions of the present invention allows the rubber stopper to be easily sealed in an extremely short period of time, maintains the sealed state for a long period of time, and does not cause deformation of the rubber stopper during manufacturing. The purpose is to obtain the state.

Means and Effects for Solving the Problems Therefore, the plastic container for infusions of the present invention has a plastic container for infusions which has a stopper containing a rubber stopper in its mouth, and has the following features: A tall plastic sheet is arranged, the ends of which are brought into close contact with each other are extended laterally, and this end is pressed between the flange of the container mouth and an annular outer plug, and a welded part is formed on the outside of the sheet. Since it is a sealed rubber stopper, the sealing properties of the rubber stopper are achieved by the close contact between two highly hygienic plastic sheets, and this sheet is strong so it will not tear due to excessive use. Moreover, since the outer stopper and the flange of the container mouth are welded together, the seal is even more perfect, completely preventing the intrusion of bacteria from the outside, and also preventing the infusion from entering the inside. , it must pass between the bottom sheet and the flange at the mouth of the container, reach the outermost end, and then enter between the two sheets, and the infusion liquid inside must enter the rubber stopper. Intrusion can be prevented.

Further, the method for manufacturing a plastic container for infusion according to the present invention includes a method for manufacturing a plastic container for infusion having a stopper containing a rubber stopper in the opening, and the method includes forming a highly hygienic plastic sheet on the upper and lower surfaces of the rubber stopper. Cover the rubber stopper with this sheet, overlap the ends of the two sheets, place this end on the flange of the container mouth, and secure it with the annular outer stopper, connecting the outer stopper and the container mouth. Since the rubber stopper is sealed by welding the outer flange of the container, the rubber stopper can be easily covered by placing a plastic sheet. This allows for a strong seal, and since no heat is applied to the rubber stopper, the rubber stopper does not deform or decompose.

EXAMPLE An example of the plastic container for infusion according to the present invention will be described based on the drawings. Reference numeral 1 denotes a plastic container for infusion, which is composed of a container body 2 and a stopper 3. The container body 2 has a hanger 4 on the bottom side, and a flange 5 extending outward on the mouth side. The container body 2 is required to be transparent because it is necessary to accurately read the condition inside the infusion, and it is also required to have heat resistance against steam sterilization, so the plastic material used for this is wire-free. Compositions consisting of low-density polyethylene, ethylene-propylene random copolymers, polypropylene, etc., and blends mainly composed of these plastics, as well as ethylene-vinyl alcohol copolymers, polyvinylidene chloride, nylon, polyester This applies to laminates in combination with etc. The upper part of the flange 5 has a plastic sheet 6 made of a highly hygienic plastic material, and further above it has a rubber stopper 7, and a plastic sheet 6 made of a highly hygienic plastic material is provided to wrap around the rubber stopper 7. It has a sheet 8 made of Here, highly hygienic plastic materials include linear low-density polyethylene, ethylene-propylene random copolymer, polypropylene, etc., as exemplified in the container body 2 above, compositions made of blends mainly composed of these, and these plastics. This includes a laminate consisting mainly of ethylene-vinyl alcohol copolymer, polyvinylidene chloride, nylon, polyester, etc. The plastic sheets 6, 8 have their ends 6
a, 8a overlap each other and are in close contact with each other to form a close contact end 9
An annular outer plug 10 is welded to the flange 5 at a welded portion 11 so as to sandwich this end. This weld is formed by ultrasonic welding. The outer plug 10 is preferably made of the same plastic material as the container body 2 because it provides good welding strength.

When the plastic container 11 for infusion is used, a needle is inserted from above the plastic sheet 6 to penetrate the plastic sheet 6, the rubber stopper 7, and the plastic sheet 8 to reach the inside of the container body. . At this time, considering the penetrability of the needle, the thickness of the plastic sheets 6 and 8 is preferably 0.1 mm to 1 mm.

Next, a method for manufacturing a plastic container for infusion according to the present invention will be explained. As shown in FIG. 3, a flange 5 is formed on the mouth side of the container body 2 formed by blow molding. Next, plastic sheet 6
is placed on the flange 5 so as to cover the mouth of the container, a rubber stopper 7 is placed above the plastic sheet 6, and a plastic sheet 8, which has been previously formed into a sheet having the same external shape as the rubber stopper 7, is placed over the rubber stopper. 7
The end 8a of the plastic sheet 6 is brought into close contact with the end 6a of the plastic sheet 6 to form a close contact end 9. Further, the annular outer plug 10 is pressed against the flange 5 so as to clamp the close end 9, and ultrasonic vibrations of 10 KHz to 50 KHz are applied to the outer plug 10 to form a welded part 11. be.

FIG. 4 shows an embodiment of another plastic container for infusion. The container main body 2 had the same structure as the above embodiment, but had a flange 5 on the mouth side, and a plastic sheet 12 made of a highly hygienic plastic material on the upper side.
It has a rubber stopper 13 on it. This plastic sheet 12 has a protrusion 12b that enters into the mouth of the container body, and the flat end of the protrusion 12b has a relatively thin-walled portion 12b'. The rubber stopper 13 is made of this plastic sheet 1.
It has a protrusion 13b corresponding to the protrusion 12b of No. 2.
Ends 12a of plastic sheets 12, 14,
They are in close contact with each other at 14a, and an annular outer plug 15 is welded to the flange 5 so as to sandwich this portion.

In the above embodiments, welding by ultrasonic vibration was used as the welding means of the present invention, but the present invention is not limited to this, and other welding methods such as hot plate welding, hot air welding, etc. can be used as appropriate.

Further, in the above embodiments, the container body was formed by blow molding, but the present invention is not limited thereto, and bags formed by forming films from the various plastic materials mentioned in the embodiments can also be used. .

Furthermore, in the above embodiment, the ends of the two sheets sealing the rubber stopper were brought into close contact by the pinching pressure between the outer stopper and the flange, but to further strengthen the sealing performance, the ends of the two sheets were sealed at these ends. It is also possible to weld the sheets. In this case, it is preferable to seal the rubber plug by welding the ends before placing the rubber plug on the flange.

Effects of the Invention As constructed as described above, the plastic container for infusion of the present invention achieves the sealing performance of the rubber stopper by the close contact between the two highly hygienic plastic sheets, and the sheet itself has high strength. Not only does it have the effect of not tearing due to excessive use, but it also has an adhesive part between the flange of the container mouth and the outer stopper on the outside of the sheet, which completely prevents the intrusion of bacteria from the outside and prevents the infusion from inside. This also prevents water from entering the rubber stopper.

Furthermore, in the method of manufacturing a plastic container for infusions of the present invention, the rubber stopper can be easily covered by arranging the plastic sheet, and the seal can be firmly sealed by welding the flange of the container opening to the outer stopper. In addition, since no heat is applied to the rubber stopper, the rubber stopper does not deform or decompose.

[Brief explanation of drawings]

1 to 4 illustrate an embodiment of the present invention, and FIG. 5 illustrates a conventional example. FIG. 1 is a side view of the plastic container for infusion according to the present invention, and FIG.
FIG. 3 is an assembled view of the stopper shown in FIG. 2, FIG. 4 is an enlarged sectional view of the stopper of a plastic container for infusion according to another embodiment, and FIG.
The figure is a sectional view of a main part explaining a conventional example. 1... Plastic container for infusion, 5... Flange, 6... Plastic sheet, 7... Rubber stopper, 8... Plastic sheet, 10... Outer stopper.

Claims (1)

[Scope of Claims] 1. A plastic container for infusion having a stopper containing a rubber stopper at its mouth, in which highly hygienic plastic sheets are placed on the top and bottom surfaces of the rubber stopper, and the sheets are brought into close contact with each other. A plastic container for infusions, characterized in that an end extends laterally, the end is clamped between a flange at the mouth of the container and an annular outer stopper, and a welded part is formed on the outside of the end to seal the rubber stopper. . 2. A method for manufacturing a plastic container for infusions having a stopper containing a rubber stopper at the mouth, in which highly hygienic plastic sheets are placed on the top and bottom surfaces of the rubber stopper, and the rubber stopper is covered with the sheet. The ends of the two sheets are stacked together, this end is placed on the flange of the container mouth, the annular outer stopper is clamped, and the outer stopper and the flange of the container mouth are welded to form a rubber stopper. A method for producing a plastic container for infusion, characterized in that the plastic container is sealed.