JP2934777B2 - Sealing structure of plastic container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a carbohydrate infusion, an electrolyte infusion, a plasma expander,
Intravenous infusions such as osmotic diuretics, amino acid infusions, fat emulsions, and high-calorie infusions, and enteral high-calorie nutritional products such as enteral nutrition, high protein nutrition, component nutrition, and liquid food. The present invention relates to a sealed plug structure of a plastic container filled with a chemical solution.

[Prior Art] Conventionally, as a plastic container of this type, a plastic container having a tubular mouth at one end of a body portion, and a plug being screwed into the tubular mouth to seal it is known. .

[Problem to be Solved by the Invention] By the way, in the conventional container as described above, after filling the medicinal solution from the mouth, a stopper is screwed into the mouth to seal the mouth. If your body is made of plastic,
It has been pointed out that the contact surface between the two members is deformed over a long period of time, and the sealing performance of the screwed plug is reduced.

Then, this invention aims at solving such a problem, and further interposes a sealing body between a mouth part and the plug body screwed to it, and also the whole or at least the sealing body. The contact sealing part has a melting point of 10 ° C. or less than the ambient temperature of the heat sterilization treatment of the container and high-pressure low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, ionomer resin, low-molecular-weight polyester resin The low melting point resin selected from the low melting point resin, after filling the container with the chemical solution, screwing a stopper on the mouth and sealing, heat sterilizing the container, the process of low melting point resin Welding between the mouth and the plug by melting or sealing with high strength between them is achieved, and the rubber plug tightly fitted to the sealing body is strongly and securely held between the plug and the plug. Between the head and the plug In addition to the sealing by screwing, they are completely sealed, and even if the mouth and the plug are deformed over a long period of time, the tightly closed structure of the plastic container with the rubber stopper is not impaired. To provide.

[Means for Solving the Problems] The present invention is configured as follows as technical means for achieving the above object.

That is, the configuration has a cylindrical mouth at one end, and in a plastic container that is sealed by screwing a plug into the cylindrical mouth, between the mouth and the plug that is screwed into the mouth. A sealing body which is tightly fitted with a rubber plug and which is compressed in the direction by tightening of the plug body, separately from the closure body or integrally with the closure body, and the whole or at least a contact sealing portion of the closure body The melting point is lower than 10 ° C or lower than the ambient temperature of the heat sterilization treatment of the container and selected from high-pressure low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, ionomer resin, and low-molecular-weight polyester resin. A plastic container hermetic plug structure characterized by comprising a melting point resin.

[Action] According to the sealed structure of the plastic container according to the present invention,
A seal in which a rubber plug is tightly fitted between the mouth portion and the stopper body screwed to the mouth portion, separately from the stopper body or integrally with the stopper body, and compressed in that direction by tightening the stopper body. Since the body is provided, after filling the container with the drug solution from the mouth, the closure is screwed by interposing a sealing body between the mouth and the closure, or the closure is formed with the closure. When the stopper is screwed in the one piece, the contact sealing portion of the low melting point resin of the sealing body is compressed to the sealing contact portion.

Then, if the container is heat-sterilized, the contact sealing portion of the low-melting-point tree of the sealing body melts during that time, and the contact sealing portion between the mouth and the plug or the mouth is welded or sealed. In particular, since the low melting point resin is compressed in that direction by the tightening of the plug, it is welded even at a low temperature.

In this way, after filling with the chemical solution, in addition to the screw portion of the stopper to which the mouth is screwed, the sealing body is sealed by welding or sealing by melting the low-melting resin, so that the sealing body is sealed for a long time. Even if the mouth and the plug are deformed due to the passage of time, the sealing performance with the rubber plug tightly fitted to the sealing body is not impaired, and the container is kept in a completely sealed state.

Embodiment An embodiment of the present invention will be described with reference to the drawings.

1 and 2, reference numeral 1 denotes a mouth of a plastic container, and this mouth 1 is, as shown in FIG.
It is formed so as to protrude from one end of the body 3 of the plastic container 2. The mouth portion 1 is integrally formed with an enlarged-diameter tube portion 4 on the opening end side, and a connecting portion between the mouth portion 1 and the enlarged-diameter tube portion 4 is formed on a flat surface 5. A screw 6 is formed on the outer peripheral surface of the enlarged diameter cylindrical portion 4. Reference numeral 7 denotes a stopper, which is a cap shaped to be screwed to the enlarged-diameter tube portion 4, and is screwed to the thread 6 of the enlarged-diameter tube portion 4 on the inner peripheral surface of the stopper 7. Thread 8
Are formed. An opening 9 is formed in the top plate of the plug 7, and the upper surface thereof is sealed with an easy-opening film 10.

On the other hand, 11 is a sealing body. The sealing body 11 has a sealing film portion 13 which closes a boundary surface between the cylindrical rising portion 12 which is inside the mouth portion 1 and along the inner peripheral surface of the enlarged diameter cylindrical portion 4 and the mouth portion 1. And the whole is made of a low melting point resin. Sealing body 11
The rising portion 12 has a height that is slightly compressed between the flat surface 5 and the top plate of the plug 7 with the plug 7 screwed and tightened to the enlarged-diameter cylindrical portion 4. A rubber stopper 14 is tightly fitted inside the sealing body 11.

The low-melting-point resin constituting the sealing body 11 has a melting point of 10 ° C. or less even if the melting point is higher than the ambient temperature of the heat sterilization treatment of the container. That is, if the ambient temperature is 100 ° C. or higher, the resin has a melting point of 110 ° C. or lower than that temperature. The low melting point resin constituting the sealing body 11 is a resin selected from a high-pressure low-density polyethylene, a linear low-density polyethylene, an ethylene-vinyl acetate copolymer, an ionomer resin, and a low-molecular-weight polyester resin. The sealing strength of the sealing body 11 with respect to the plug 7 is high, and a high-strength seal between them can be achieved. Plastic container 2
Is formed by blow molding a thermoplastic.

In the plastic container 2 configured as described above, after the medicinal solution is filled from the mouth 1, the enlarged diameter cylindrical portion 4 of the mouth 1 is filled.
Then, after fitting the sealing body 11 in which the rubber stopper 14 is closely fitted,
When the plug 7 is screwed and tightened, the enlarged-diameter cylindrical portion 4 of the mouth 1 is
Sealed. In this state, the rising portion of the sealing body 11 is
12 is compressed between the flat surface 5 and the plug 7.

The container 2 filled with the chemical solution and screwed with the stopper 7 is subjected to heat sterilization, and the sterilization is performed at a pressure of 100 ° C. to 125 ° C.
In water vapor. When the sterilization process is performed, the contact sealing portion of the low-melting-point resin sealing body 11 compressed between the flat surface 5 and the plug 7 is melted, and the flat surface 5 and the plug The space between the members 7 is welded by the sealing body 11 and further sealed by the molten resin.

For this reason, after filling with the chemical solution, the mouth 1 is further sealed by welding or sealing the low-melting resin of the low-melting resin of the sealing body 11 in addition to the sealing by the screwing portion of the plug 7,
Even if the mouth 1 and the plug 7 are deformed over a long period of time, the sealing performance with the rubber plug 14 is not impaired, and the container 2 is kept in a completely sealed state.

FIGS. 3 and 4 show other examples of the embodiment shown in FIGS. 1 and 2, respectively.

That is, the one shown in FIG.
Only the low-melting resin part 1
It consists of 5,15. In this example,
An annular projection 16 is formed on the opening end side of the mouth 1 and the plug 7
An annular protrusion 17 is also formed on the top plate of the plug body 7, and the top plate of the plug 7 is opened by a pull ring 18. 19
Is the score of the opened section.

FIG. 4 shows a sealing portion 20 formed integrally with the plug 7 by using the sealing member 11 shown in FIG. Low-melting point resin only at stop
15 is assumed.

In each of these embodiments, the low-melting resin portion 15 of the sealing body 11 or the sealing portion 20 is compressed by screwing and tightening the plug 7, and the low-melting resin is heat-sterilized in the container 2. The portion 15 is melted, and the space between the flat surface 5 and the plug 7 is sealed.
Since it is further sealed by 11 or the sealing part 20, a rubber stopper
The sealing performance associated with 14 is not impaired, and the sealed state of the container 2 is completely maintained for a long period of time.

Further, according to these embodiments, since the portion of the sealing body 11 or the sealing portion 20 to be welded is inside the mouth portion 1, if sterilization is performed in a pressurized state, the pressure in the container 1 is increased. As a result, the molten low melting point resin is added so as to move the resin outward, and acts so as to densely fill the gap between the opening 1 and the sealing body 11 or the sealing part 20. A perfect seal is obtained.

Furthermore, according to these embodiments, since the sealing body 11 or the sealing portion 20 in which the rubber stopper 14 is fitted is fitted in the large-diameter cylindrical portion 14, an injection needle is inserted from outside when used. At this time, the rubber stopper 14 can be prevented from falling into the container 1.

In addition, although the container 1 shown in the said Example showed the thing of a bottle shape, this invention is not specifically limited as long as it is a container which has a mouth, In addition to a bottle shape, for example, a bag shape Things are also included.

In addition, the low melting resin was heated by heat sterilization,
In addition to sterilization processing and sterilization processing, it includes those that are simply heated.

[Effects of the Invention] According to the present invention, a sealing body is further interposed between a mouth portion and a plug body screwed thereto, and the entire sealing body or at least a contact sealing portion has a melting point. At a temperature of 10 ° C. or lower than the ambient temperature of the heat sterilization treatment of the container and a low-melting resin selected from a high-pressure low-density polyethylene, a linear low-density polyethylene, an ethylene-vinyl acetate copolymer, an ionomer resin, and a low-molecular-weight polyester resin. By being composed of melting point resin, after filling the container with the drug solution, a stopper is screwed into the mouth and sealed, and in the process of heat sterilizing the container,
Welding between the mouth and the plug by the melting of the low melting point resin or sealing with high strength between them is achieved, and the rubber plug tightly fitted to the sealing body is strongly and securely held between the plug and the plug. In addition to sealing the mouth and the plug by screwing them together, they can be completely sealed, and even if the mouth and the plug are deformed over a long period of time, sealing with a rubber stopper is possible. It is possible to obtain a tightly-sealed structure of a plastic container whose properties are not impaired.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a part of a container showing one embodiment of the present invention, FIG. 2 is an exploded sectional view of the same, FIG. 3 is a partial sectional view showing another embodiment, and FIG. FIG. 5 is a front view of the entire plastic container of the embodiment shown in FIGS. 1 and 2. FIG. DESCRIPTION OF SYMBOLS 1 ... mouth part, 2 ... container, 3 ... trunk | drum, 4 ... expanded diameter cylinder part, 5 ... flat surface, 6 ... thread, 7 ... plug body, 8 ... thread, 9 ...... Opening, 10 ... easy-opening film, 11 ... sealed body, 12 ... rising part, 13 ... sealing film part, 14 ... rubber stopper,
15 low melting point resin part, 16 annular protrusion, 17 annular protrusion, 18 pull ring, 19 score, 20 sealing part

Claims (1)

(57) [Claims] 1. A plastic container having a cylindrical mouth at one end and sealing a plug by screwing the plug into the cylindrical mouth, wherein a plug is provided between the mouth and the plug screwed into the mouth. A sealing body which is tightly fitted with a rubber stopper and which is compressed in the direction by tightening of the stopper, integrally with the body or the stopper or the stopper, and the whole of the sealing body or at least the contact sealing portion is provided. The melting point is 10 ° C or lower than the ambient temperature of the heat sterilization treatment of the container, and a low melting point selected from high-pressure low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, ionomer resin, and low-molecular-weight polyester resin. A sealed structure of a plastic container, which is made of resin.