JPS6314847Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stopper for a plastic container for liquid such as blood.

Conventionally, after a liquid such as blood is filled into a container, the container is sealed with a plastic cap, sterilized, and then a rubber stopper is fitted or covered, and a heat-shrinkable overlapping portion is formed on top of the container. A major drawback of this configuration is that the rubber stopper is not included in the sterilization process. If sterilization is carried out with a rubber stopper attached, cooling water during the process will enter between the plastic cap and the rubber stopper, making it unsanitary, and the rubber stopper itself will deteriorate due to high-temperature moisture.

Further, even if the rubber stopper and the plastic cap are fitted together, there are drawbacks such as liquid leakage from the boundary when inserting and removing the needle.

This invention was developed in consideration of these drawbacks, and is extremely hygienic as it prevents the contents from leaking during use and can be sterilized in a sealed state, and is extremely easy to handle during the filling and sealing process. It has the advantage of being

The present invention will be explained in detail by means of illustrated embodiments.

Fig. 1 is an explanatory view showing a cross section of the stopper of the plastic container for transfusion of blood or other fluids of the present invention, and Fig. 2 is a perspective view of the same. The stopper A is fitted into the opening of the plastic container B to seal it. It is something. 1 is a rubber stopper,
2 and 2' are thermoplastic plastic thin films, 3 is an annular body that fits tightly inside the container opening, 4 is a flange that is in close contact with the upper edge of the periphery of the container opening, and a is the thin film 2 and plug resin. 5 is an opening for inserting an injection needle or the like. 6 is fused to a thin film, and the reinforcing portion passing through at least the center thereof is necessary when sealing the plug A and the plastic container B using ultrasonic waves. That is, the plastic thin films 2, 2' fused with the injection resin are lifted from one surface of the rubber stopper (particularly the center part) due to contraction as the molded product cools, and are vibrated by the ultrasonic waves during ultrasonic sealing. .
If this vibration is large, the plastic membranes 2, 2' are destroyed and holes are formed. The degree of this destruction is more likely as the lifting is larger and the plastic thin films 2, 2' are thinner, and the plastic film 2, 2' is integrally molded for the purpose of suppressing this lifting.

3 and 4 show different shapes of the reinforcing part 6. In Fig. 3, the reinforcing part 6 is straight and the injection needle insertion part b is made wider, and in Fig. 4, the reinforcing part 6 is straight. The needle insertion part b is made round and narrow, and the strength of the reinforcing part 6 is made sufficiently strong, so that the lifting of the plastic thin films 2 and 2' from the rubber stopper 1 is reduced.

The plug of the present invention can be manufactured using a general injection molding machine. A vertical type is easier to use due to the insert. The mold presses the injection needle insertion part b with the upper and lower cores by positioning and pressing the plastic thin films 2 and 2' vertically around the rubber stopper 1, and fills the empty cavity with the injection resin. The height of the cavity between the upper core and the lower core is set to be 0.1 to 0.2 mm lower than the thickness of the rubber plug 1 and the plastic thin films 2, 2', and the rubber plug 1 and the thin films 2, 2' are separated by mold clamping. so that it is firmly pressed down. In other words, the mold may be either a pin gate type or a side gate type, but if there is only one gate opening, it is necessary to prevent the insert from shifting from the center due to injection pressure, and to prevent the insert from shifting from the center due to the injection pressure. This is to prevent air from remaining between the two. For example, rubber stopper 1
is made of butyl rubber with a thickness of 3 mm, and the plastic thin films 2 and 2' are made of two ordinary polypropylene sheets with a thickness of 0.2 mm.The injection resin is polypropylene (Show Aroma MA610, trade name).The injection molding machine is a general-purpose injection molding machine. The machine is vertical type, 1 ounce, the mold has one side gate type, and the molding conditions are resin temperature.
The temperature was 260° C., the injection pressure was 50 Kg/cm ² , the injection time was 8 seconds, and the cooling time was 20 seconds. As shown in FIG. 1, a rubber stopper 1 formed in this way has thin plastic films 2, 2' placed on top and bottom (because the adhesion between rubber and thin films is not good, plastic thin films 2, 2' are placed on top and bottom).
Since the thin film 2' and the injected resin are of the same quality, they will be fused at the fused part a) and are completely surrounded by plastic, so that moisture and dust will not be absorbed inside during sterilization (by hot water or steam). It is extremely hygienic and does not get wet. Polypropylene is the most suitable injection resin and plastic film. Further, since the rubber stopper 1 is not exposed on the surface, there are advantages that deterioration of the rubber stopper surface due to sterilization is prevented and that the rubber stopper is not contaminated until it is used. The rubber stopper 1 should have a thickness of 2 to 6 mm to ensure the insertion force of the needle and to prevent liquid leakage, and the appropriate thickness of the plastic thin films 2 and 2' is 0.1 to 0.4 mm. The fused part a is held down by the injection pressure and there is no liquid leakage from the surrounding area. Moreover, since the plastic thin film within the opening 5 is fused to the injection resin at the reinforcing portion 6, it will not be destroyed by ultrasonic vibrations.

c is a rib for ultrasonic sealing, that is, when the plug A is fused to the plastic container B by ultrasonic waves,
By providing such ribs c, uniform fusion can be easily achieved. d is a sealing collar integrally molded during molding of the plastic container B, and the collar 4 is sealed to the collar d.

Furthermore, in the ultrasonic sealing, it is desirable to provide steps 7 and 7' on the stopper A and the plastic container B as shown in FIG. 5 in order to prevent melted plastic from scattering and entering the container.

As mentioned above, this invention focuses on the rubber stopper 1.
The thermoplastic thin films 2, 2' are placed over and above the thermoplastic thin films 2, 2'.
The key point is that the outer periphery of the rubber stopper 1 is integrally molded with a thermoplastic resin of the same quality as the plastic thin films 2 and 2', with the surface of the rubber stopper 2 exposed at two or more places. The stopper does not come off (it will come off if you cover it like before or put it in later). Foreign matter does not get in, it is easy to sterilize and is strong, it is fused to the container so there are fewer parts, so there is no need for an overcap, it is small, and the needle insertion part, which is the exposed surface of the thermoplastic thin film, is large. The needle can be easily inserted. Furthermore, since the stopper of the present invention presses the rubber stopper 1 from the outer periphery, the area around the inserted needle is tightly sealed with rubber, so it has excellent advantages such as there is no fear of liquid leakage.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the stopper of the plastic container of the present invention, Fig. 2 is a perspective view showing the external appearance, Figs. 3 and 4 are plan views of the stopper with different shapes of reinforcing portions, and Fig. 5 The figure is a partially cutaway side view of a suitable plug of an ultrasonic seal. 1...Rubber stopper, 2,2'...Plastic thin film,
3... Annular body, 4... Flange, 5... Opening, 6...
...Reinforcement part, 7, 7'...Step, A...Plug body,
B... Container, a... Fusion part, b... Syringe needle insertion part, c... Rib, d... Collar.

Claims (1)

[Scope of utility model registration request] In a stopper for a plastic container for liquid such as blood, a rubber stopper 1 whose upper and lower sides are covered with thermoplastic thin films 2 and 2' is located at the center, and at least one rubber plug is fused to the thermoplastic thin films 2 and 2'. A plastic container is formed by integrally surrounding and molding the outer periphery of the rubber stopper 1 with thermoplastic resin of the same quality as the plastic thin films 2 and 2', with its surface exposed at two or more places through a reinforced portion passing through its center. Plug body.