JPH07137160A - Method of sealing/mouth of container made of synthetic resin/for transportation of liquid - Google Patents

Abstract

PURPOSE:To form a container made of synthetic resin by blow molding, fill the container with grout, seal a mouth of the container and further fit a rubber stopper for preventing the grout from leaking at the time of use into the upper part of the mouth of the container. CONSTITUTION:A container 1 made of a synthetic resin is formed by blow molding and filled with grout. A mouth 2 of the container is sealed and, in a semi-molten state, or by heating the mouth of the container with a heater after cure, a rubber stopper 3 for preventing the grout from leaking at the time of use is inserted under pressure into the upper part of the mouth of the container. An overhanging part 5 of the synthetic resin, which is caused at the upper part of the mouth of the container by the insertion of the rubber stopper, is pressed by using a force 7 and curved inward, whereby the top end of the overhanging part of the synthetic resin is fitted into a ring-shaped recess 8 provided at the outer peripheral part of the upper surface of the rubber stopper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of closing a synthetic resin container container for infusion, in which a rubber stopper for preventing liquid leakage during use can be inserted into the container container while the container container is sealed after being filled with a chemical solution. .

[0002]

2. Description of the Related Art Conventionally, a method for closing the mouth of a synthetic resin container of this kind is disclosed in Japanese Patent Publication No. 3-289 of the present invention.
There is one disclosed in Japanese Patent Publication No. 44-44.

In this publication, a synthetic resin container for infusion is sealed with a synthetic resin cap for sealing the container and a rubber stopper for preventing liquid leakage during use, and the upper part of the mouth is sealed. By heating and pressing the upper part of the synthetic resin plug using a welding heater or the like, the respective parts are curved and integrated inward, and the rubber plug is fixedly supported.

Further, as disclosed in, for example, Japanese Utility Model Publication No. 58-41964, a rubber plug is fitted into the mouth of a plastic container body via a sealing member, and the rubber plug The annular projection of the plug holding member is fitted in the annular groove, and the mouth of the container body and the brim formed on the plug holding member are welded by heat sealing using high frequency, ultrasonic waves, or the like. .

[0005] Then, as disclosed in Japanese Utility Model Publication No. 58-41964, there is a plastic container body in which a sealing member is not provided at the mouth portion, and is disclosed in Japanese Utility Model Laid-Open Publication No. 1-16846.
There is one as shown in Japanese Patent Publication No.

[0006] Further, as disclosed in, for example, Japanese Utility Model Laid-Open No. 3-94234, an upper lid separately molded and manufactured on a lower lid having a sealing film disposed on the upper edge of the opening is sealed. There is one in which a rubber stopper is interposed on a film for use and the both are welded by ultrasonic heating or the like to be integrally molded.

Further, there is a method in which a synthetic resin is extruded in a tube shape into a mold, a synthetic resin container is molded by a well-known blow molding and a chemical solution is filled, and a mouth part of the container is cut and closed by a separate sealing mold. is there.

[0008]

In each of the prior art publications, when heating and welding are insufficient, there is a serious problem that a portion not welded occurs at the mouth portion, and the chemical liquid leaks out.

Further, if microorganisms or the like are attached to the sealing member such as a rubber stopper or a synthetic resin mouthpiece for sealing, which is in direct contact with the chemical solution, the chemical solution is contaminated, which is a great drawback. is there.

Further, in a case where a synthetic resin container is molded and a chemical liquid is filled by blow molding, since the container mouth can be closed between the container molding and the chemical liquid filling without opening, the chemical liquid is contaminated by microorganisms or the like. However, there is a problem that it cannot be used for an infusion container because there is no equipment such as a rubber stopper for preventing liquid leakage during use.

The present invention molds a synthetic resin container by blow molding, fills a chemical solution and seals the mouth portion, and further, a synthetic resin container mouth for infusion in which a rubber stopper for preventing leakage during use is interposed in the container mouth portion. It is an object of the present invention to provide a part closing method.

Further, according to the present invention, a rubber stopper for preventing liquid leakage during use can be interposed without providing a special device at the mouth of the container, and a simple and inexpensive method for closing the mouth of the synthetic resin container for infusion. The purpose is to provide.

Another object of the present invention is to provide a method for closing the mouth of synthetic resin containers for infusion, which is free from contamination of chemicals by microorganisms and the like.

[0014]

In order to achieve the above-mentioned object, the present invention forms a synthetic resin container by blow molding, fills a chemical solution and seals the mouth part, and the upper part of the container mouth part in a semi-molten state. Insert a rubber stopper to prevent liquid leakage during use under pressure.

Then, the synthetic resin overhanging portion generated at the upper portion of the container mouth portion by the pressure insertion of the rubber stopper is curved inward by pressing with a pressing die or the like, and the upper mouth portion and the rubber stopper are integrated. Turn into.

Alternatively, a synthetic resin container is molded by blow molding, a chemical solution is filled, and a mouth is sealed. After hardening, the container mouth is heated by a heater, and a rubber stopper for preventing liquid leakage during use is provided on the container mouth. Insert with pressure.

Then, the synthetic resin overhanging portion generated at the upper portion of the container mouth portion by the pressure insertion of the rubber stopper is curved inward similarly to the above, and the mouth portion upper portion and the rubber stopper are integrated.

[0018]

Since the synthetic resin container 1 is molded by blow molding, the chemical solution is filled, and the mouth portion 2 is sealed, the container 1 is provided with the rubber stopper 3 for preventing liquid leakage during use, which is then pressure-inserted in the upper portion of the mouth portion. There is no direct contact with the drug solution inside, and the drug solution is not contaminated by microorganisms.

Further, the container 1 is hermetically sealed by the separate sealing molds 4 and 4 at the time of blow molding, and the rubber stopper 3 is press-inserted by the rubber stopper pressing rod 6 on the upper portion of the container mouth portion 2 in the semi-molten state. The upper portion of the portion 2 is easily deformed into the shape of the pressed rubber plug 3.

Then, the synthetic resin deformed into the shape of the rubber stopper by the pressure insertion of the rubber stopper 3 protrudes to the upper portion of the container mouth portion 2 to form the synthetic resin overhang portion 5.

By pressing the synthetic resin overhanging portion 5 with a pressing die 7 into which a rubber plug pressing rod 6 is fitted, the overhanging portion 5 is curved inward (in the direction of the center of the rubber plug 3) and its tip end is bent. Can be fitted into the annular recess 8 formed on the outer peripheral portion of the upper surface of the rubber plug 3, and the container opening 2 and the rubber plug 3 can be integrated.

Alternatively, the synthetic resin container 1 is molded by blow molding, the chemical solution is filled, and the mouth 2 is sealed, and after curing, the synthetic resin container 1 is again provided with a rubber stopper 3 for preventing liquid leakage during use. In the case of mounting, the container mouth 2 is heated by a heater (not shown), and the rubber stopper 3 is press-inserted into the softened container mouth 2 upper part. It easily transforms into the shape of.

By pressing the synthetic resin overhanging portion 5 similar to the above with a pressing die 7 into which a rubber plug pressing rod 6 is inserted, the overhanging portion 5 is inward (in the direction of the center of the rubber plug 3).
It can be bent into a curved shape, and its tip can be fitted into the annular recess 8 formed on the outer peripheral portion of the upper surface of the rubber stopper 3 to integrate the container opening 2 and the rubber stopper 3.

[0024]

Embodiments will be described in detail with reference to the accompanying drawings showing an example of a method for closing the opening of a synthetic resin container for infusion according to the present invention.

FIG. 1 shows a state in which the mold is closed with respect to the tubular synthetic resin extruded into the mold and the bottom is hermetically sealed. FIG. 2 shows the blowing / filling nozzle lowered to the mold neck. Then
Shows a state in which compressed air is blown in.

FIG. 3 shows a state in which the mouth is molded and the upper part of the mouth is sealed, and FIG. 4 shows a state before the rubber stopper for preventing liquid leakage during use is pressed onto the sealed upper part of the mouth. Is.

FIG. 5 shows a state in which the synthetic resin overhang is formed at the upper part of the mouth by inserting the rubber plug under pressure.
FIG. 6 shows a state in which the synthetic resin overhanging portion is curved inward by a pressing die, and FIG. 7 shows a state in which it is completed as an infusion container.

Reference numeral 1 denotes a synthetic resin container molded by well-known blow molding. A thermoplastic synthetic resin is extruded in a tube shape into the molds 9, 9 and the molds 9, 9 are closed to form a tube-shaped synthetic resin 10. The bottom of the mold is sealed, and the molds 9 and 9 have necks 11,
The blowing / filling nozzle 12 is lowered to 11 and compressed air is blown into the molding 11.

Reference numeral 2 denotes a mouth portion of the synthetic resin container 1, which is a mold 9,
It has a cylindrical shape and is molded by mouth molding dies 13, 13 provided on the upper surface of 9.

Then, the upper end of the mouth portion 2 is cut from the tubular synthetic resin 10 by the separate sealing dies 4, 4 provided on the upper surface of the mouth portion forming dies 13, 13 to seal the upper portion of the mouth portion 2.

3 is a rubber stopper for preventing liquid leakage during use, which is a mold 9,
The lower surface is molded so as to have a convex step 3a so that it can be inserted into the neck portions 11, 11, and an annular concave portion 8 is molded on the outer periphery of the upper surface. Adsorbed.

Reference numeral 5 is a semi-molten resin, or a synthetic resin protruding around the rubber stopper 3 by heating with a heater (not shown) after curing and inserting the rubber stopper 3 into the upper portion of the mouth 2 under pressure. It is an overhang part.

Reference numeral 7 denotes a pressing die into which the rubber stopper pressing rod 6 is inserted and which can be moved up and down along the rubber stopper pressing rod 6, and presses the synthetic resin overhanging portion 5 generated around the rubber stopper 3, Bend toward.

Then, the tip of the inwardly curved synthetic resin overhanging portion 5 is fitted into the annular recess 8 formed on the outer periphery of the upper surface of the rubber plug 3, and as shown in FIG. The mouth 2 is integrated.

[0035]

According to the present invention having the above-mentioned structure, the upper portion of the mouth portion 2 sealed by blow molding is heated in a semi-molten state or with a heater (not shown), and the rubber stopper pressing rod 6 sucks it at its lower end. The rubber stopper 3 for preventing leakage at the time of use is inserted under pressure, and the synthetic resin overhanging portion 5 protruding to the periphery is fitted into the annular recess 8 formed on the outer periphery of the upper surface of the rubber stopper 3, and the mouth portion 2 and the rubber stopper 3 are inserted. Since these are integrated with each other, the rubber stopper 3 for liquid leakage prevention during use can be simply and inexpensively installed without providing a special device.

Further, since the mouth portion 2 is sealed after the chemical liquid is filled and the rubber stopper 3 for preventing liquid leakage during use is pressure-inserted from above, the rubber stopper 3 and the chemical liquid do not come into direct contact with each other, and It is not contaminated with microorganisms.

Further, during blow molding, the container is molded, the chemical solution is filled, and the mouth portion 2 is sealed, and the mouth portion is not heat-welded and closed as in the conventional case. There is no leakage.

[Brief description of drawings]

FIG. 1 is a central longitudinal cross-sectional view of essential parts in a state where a thermoplastic synthetic resin is extruded into a mold into a tube shape and the mold is closed.

FIG. 2 is a central longitudinal cross-sectional view of essential parts in a state where the blowing / filling nozzle is lowered to the mold neck portion of FIG. 1 to finish the blow molding of the container and the filling of the chemical liquid.

FIG. 3 is a central longitudinal cross-sectional view of a main part in a state in which a mouth part is molded with a mouth part molding die, the mouth part is sealed with a separate sealing mold, and a container is cut from a tubular synthetic resin.

FIG. 4 is a central vertical cross-sectional view of a main part of the state before the rubber stopper for preventing liquid leakage during use is pressure-inserted into the upper portion of the mouth of the container.

FIG. 5 is a central longitudinal cross-sectional view of a main part in a state where a rubber stopper for preventing liquid leakage during use is pressure-inserted into an upper portion of a container mouth.

FIG. 6 is a central longitudinal cross-sectional view of a main part in a state where the synthetic resin overhanging portion generated by the pressure insertion of the leakage preventing rubber stopper during use is curved by heating to integrate the rubber stopper and the mouth portion.

FIG. 7 is a central longitudinal cross-sectional view of a main part when the mold is opened and a synthetic resin container for infusion is completed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Synthetic resin container 2 Mouth part 3 Rubber stopper for leakage prevention during use 3a Convex step 4 Separation sealing mold 5 Synthetic resin overhanging part 6 Rubber stopper pressing rod 7 Stamping die 8 Annular recess 9 Mold 10 Tube synthetic resin 11 Neck 12 Blow / Fill Nozzle 13 Mouth Mold

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B65D 39/04 J

Claims (2)

[Claims] 1. A synthetic resin container is formed by blow molding, a chemical solution is filled, and a mouth is sealed, and a rubber stopper for preventing liquid leakage during use is pressure-inserted into the upper part of the semi-molten container mouth, and A synthetic resin for infusion characterized in that the synthetic resin overhanging portion generated by the pressure insertion of the rubber stopper is curved inward by pressing it with a pressing die or the like, and the upper mouth portion and the rubber stopper are integrated. Closure method for container mouth. 2. A synthetic resin container is molded by blow molding, a chemical solution is filled, and a mouth portion is sealed. After curing, the mouth portion of the container is heated by a heater, and a rubber stopper for preventing liquid leakage during use is provided above the mouth portion of the container. By pressing and pressing the synthetic resin overhanging part generated by the pressure insertion of the rubber plug with a pressing die or the like to bend inward, thereby integrating the mouth upper part with the rubber plug. A method for closing the mouth of a synthetic resin container for infusion.