JP2923671B2 - Method of manufacturing container filled with contents - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a plastic product filled with highly hygienic contents that require heat treatment for sterilization or sterilization during production of foods and pharmaceuticals. The present invention relates to a method for manufacturing a container.

[Prior Art] Conventionally, as a plastic container of this type, Japanese Patent Application Laid-Open
What is described in -245392 is known.

The container has a cylindrical mouth formed by blow molding, and a burr for closing the surface is formed at an end of the mouth, and when filling the container with a drug solution as a medicine, the burr is formed. After resection and filling with a drug solution, a pull-top cap is welded to the open end of the mouth to seal the container. At the time of opening, the pull-top having the thin fragile portion is cut off to open.

[Problems to be Solved by the Invention] In the conventional container as described above, since the insertion hole of the blow nozzle is opened in the burr portion at the mouth of the container to be blow-molded, the container is completely sealed. However, there is a problem in the process that fine dust and the like may enter from outside during storage and transportation, and the inside of the container must be washed when filling with a chemical solution. Further, in the case where the pull-top cap is welded to the opening end of the mouth in this way, after opening the mouth and filling the liquid medicine, when welding the pull-top cap to the mouth, welding burrs are generated. The welding burrs fall into the chemical solution during storage and transport of the container, which not only causes a problem with the hygiene of the chemical solution, but also keeps the pull-top cap from being held externally during welding and cooling of the pull-top cap. Has to be kept compressed in the mouth.

As described above, this type of conventional container has problems in terms of hygiene after the blow molding until filling of the contents and after filling the contents, respectively, and the present invention aims to solve such problems. The blow-molded container is melt-sealed at a blow hole, which is an insertion mark of a blowing nozzle formed in a burr portion formed by a parison at the time of blow molding, to make the container a completely sterile sealed state. Storage,
Hygiene during transportation is maintained, so that the contents can be filled without washing the container, and burrs fall from the mouth into the contents after filling the contents. In addition, the present invention provides a method for producing a container filled with contents capable of keeping the contents hygienic.

In addition, this kind of conventional container has a problem that the plug must be kept pressed from the outside during the period from welding of the plug to cooling, and the present invention solves such a problem. Another object of the present invention is to manufacture a container filled with contents that can lock and seal a stopper without the need to keep pressing the stopper from the outside, by locking and sealing the mouth and the stopper during welding. It provides a method.

[Means for Solving the Problems] The present invention employs the following method as means for achieving the above object.

That is, a method of producing a plastic container having a cylindrical mouth portion formed by blow molding, filling the container with the contents, and then sealing the cylindrical mouth portion with a stopper, using a pressurized gas. A mouth with a locking part is formed on the outer peripheral surface by blow molding, and the blow hole, which is the insertion mark of the blow nozzle formed in the burr formed by the parison during blow molding, is melt-sealed to completely sterilize the container. When filling the contents, cut off the burr part, open the mouth and fill the contents, and after filling the contents, fill the contents, and between the mouth and the stopper to be locked to the mouth. The mouth is locked and sealed with a stopper with a low-melting resin interposed, and then the container is heat-sterilized, and the low-melting resin is melted by the heat of the sterilization to fix the stopper to the mouth. Of a container filled with It is a production method.

In the present invention, a stopper is a sealing device that seals a mouth, and a stopper that encloses a rubber stopper in a top plate portion mainly used for medicine or a cap that mainly seals a mouth used for food is used. It is assumed that each of them is opened at a fragile portion of a thin wall or the like.

In addition, the heat sterilization treatment is performed at a temperature of about 80 ° C. or more for 1 second or more, and is a heat treatment mainly for sterilization or sterilization performed after filling the contents, but not necessarily for the purpose of sterilization or sterilization. You may.

Further, in the present invention, the engagement between the mouth and the plug is
This includes a lock for fitting the convex portion and the concave portion formed on the mouth and the plug, and a screw-locking with a screw formed on the mouth and the plug.

[Operation] According to the method for manufacturing a container filled with contents according to the present invention, a blow hole, which is an insertion mark of a blowing nozzle formed in a burr portion formed by a parison during blow molding of a container, is melt-sealed to form a container. Is completely sterile and sealed, so that hygiene during storage and transportation is maintained, and the contents can be filled without washing the container.

Also, after filling the contents, the stopper is locked in the mouth, and a low melting point resin is interposed between the mouth and the stopper, and in the process of heating and sterilizing the container after filling the contents. Then, the low melting point resin is melted by sterilizing heat and the stopper is fixed to the mouth. As described above, after filling the contents, the mouth is sealed with the stopper to be engaged, so that there is no danger of the welding burrs falling into the container, and the contents in the container are kept hygienic. .

Furthermore, since the fixing of the stopper is performed in a state where the low melting point resin is interposed between the mouth and the stopper locked to the mouth and the mouth is locked and sealed with the stopper, during the period from welding to cooling, Both can be compressed and held without any external force.

Example A method for manufacturing a container filled with a chemical solution according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a blow molding mode of the container, FIG. 2 shows a mode of cutting off a burr portion at the mouth of the blow molded container, FIG. 3 shows a mode of filling the container with a chemical solution, and FIG. FIG. 5 shows the container after filling with the chemical, and FIG. 5 shows the configuration of the mouth of the container after filling with the chemical.

In FIG. 1, reference numeral 1 denotes a container, and this container 1 is formed by blow molding of a thermoplastic resin. Reference numeral 2 denotes a trunk, and a cylindrical mouth 3 is integrally formed at one end of the trunk 2, and a hanging piece 4 is integrally formed at the other end. Reference numeral 5 denotes a split mold for blow molding the container 1. The above container 1
The mouth 3 has a thread 6 formed on the outer peripheral surface thereof, and the opening end of the mouth 3 is sealed by a burr 7 formed by a parison at the time of blow molding. Reference numeral 8 denotes a blowing nozzle. Aseptic pressure gas is blown into the parison by the blowing nozzle 8, and the container 1 is blow-molded in the closed split mold 5. When the blowing nozzle 8 is pulled out after blowing, the burr portion is formed. 7 has a blow hole 7a as an insertion mark,
The blow hole 7a is melted by being brought into contact with the heated plate body, and moves and closes the surrounding resin to form a sealed portion, thereby bringing the container 1 into a completely sterile sealed state. Mouth 3
A flange portion 9 is formed at the lower part of the frame.

The heating means for melting and sealing the blow hole 7a is
In addition to the direct heating by the plate body, it is also possible to perform indirect heating by blowing out high-temperature air. Further, the blow nozzle 8 is pulled out at the time of blow molding, and the die is sealed by sliding the die. It is also possible.

Since the blow-molded container 1 is completely sterilized and sealed as described above, the container 1 is kept hygienic even during storage or transportation.

When filling the container 1 with the chemical solution, the burr 7 is cut off by the cutting blade 10 and the opening 3 is opened as shown in FIG. That is, while holding the container 1 so that the mouth portion 3 faces down, while rotating the container 1, the cutting blade 10 is inserted between the mouth portion 3 and the burr portion 7, and the burr portion 7 is dropped. To separate.
In this case, if the cutting blade 10 is heated, the burr portion 7 can be easily cut off.

Next, as shown in FIG. 3, the chemical solution filling nozzle 11 is inserted into the container 1 from the opened mouth portion 3, and the chemical solution filling nozzle
From 11, the medicine is filled into the container 1.

After filling the container 1 with the liquid medicine, the stopper 3 is screwed into the mouth 3 to seal the mouth 3, but when the stopper 12 is screwed, the stopper 3
A low melting point resin 13 is interposed between the flange portion 9 and the lower portion of the plug 12, and the plug 12 is screwed in a tightened state. When the plug 12 is tightened, as shown in FIG. 5, a low melting point resin 13 is interposed between the flange 9 of the mouth 3 and the lower portion of the plug 12 in a compressed state. 14 is a thread of the plug 12.

As described above, the sealed container 1 filled with the chemical is
It is placed in a sterilization tank (not shown) and heat-sterilized for a certain period of time. During this heat-sterilization processing, the low-melting resin 13 is melted by the heat of sterilization, and the low-melting point of the mouth 3 and the plug 12 is melted. Resin 13
Welded by The sterilization tank heats the container 1 to 115 ° C. As the low melting point resin 13, those having a melting point of 120 ° C. or less, for example, ethylene vinyl acetate copolymer, high pressure method low density polyethylene, linear low density polyethylene, linear extremely low density polyethylene, ionomer resin, low molecular weight polyester Resin or the like is used.

The plug 12 screwed into the mouth 3 is provided with a pull ring 15 as shown in FIGS. 4 and 5, and the top plate is pulled by pulling the pull ring 15 as shown in FIG. The part 16 can be cut off.
17 is a score which is a thin fragile part. A rubber stopper 18 is closely fitted in the stopper 12.

According to the manufacturing method according to the present embodiment, since the blow hole 7a formed in the burr portion 7 of the mouth portion 3 at the time of blow molding is sealed by heat welding, the blow molded container 1 is completely sealed, and the aseptic condition is maintained. Will be kept. Therefore, after the container 1 is stored and filled with the drug solution after transportation, the container 1
Need not be washed, and the chemical solution can be filled as it is.

After filling with the chemical, a plug 12 is screwed into the mouth 3 and a low-melting resin 13 is interposed between the mouth 3 and the plug 12. In the process of heat sterilization, the low-melting resin 13 is melted by the heat of sterilization, and the plug 12 is fixed to the mouth 3. In this way, after filling the liquid medicine, the mouth part 3 is sealed with the stopper 12 which is screwed.
There is no danger that the welding burr will fall into the container 1, and the chemical solution in the container 1 is kept hygienic.

Further, since the low melting point resin 13 is interposed between the flange 9 of the mouth 3 and the lower part of the plug 12 in a compressed state, the low melting point resin 13
Can be shortened until it is melted and welded.

The filling of the contents of the present invention can be performed simultaneously with the blow molding. In this manner, the filling can be performed in an aseptic state without washing the inside of the container at the time of filling.

In addition, although the container 1 shown in the said Example showed the thing of a bottle shape, this invention is not limited especially if it is a container which has a mouth part, In addition to a bottle shape, for example, a bag This includes shapes.

[Effects of the Invention] The present invention relates to a method for producing a plastic container comprising forming a container having a cylindrical mouth by blow molding, filling the container with the contents, and sealing the cylindrical mouth with a stopper. So,
An opening having an engaging portion on the outer peripheral surface is formed by blow molding with a pressurized gas, and a blow hole, which is an insertion mark of a blowing nozzle formed in a burr formed by a parison during blow molding, is melt-sealed to seal the container. With a completely sterile sealed state, when filling the contents, cut off the burr part, open the mouth, fill the contents, fill the contents, and then lock the mouth and the stopper with the mouth. The mouth is locked and sealed with a plug with a low-melting resin interposed between them, and then the container is heat-sterilized, and the low-melting resin is melted by the heat of the sterilization to fix the plug to the mouth. Since this is a method of manufacturing a container filled with a product, the blow-molded container is completely sterilized by melting and sealing the blow hole, which is the insertion mark of the blow nozzle formed in the burr formed by the parison during blow molding. Sealed As it is possible to maintain the hygiene during storage and transportation, the contents can be filled as it is without washing the container, and the burrs fall from the mouth into the contents after filling the contents Therefore, the effect of keeping the contents hygienic can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a blow molding mode of a container according to a method of manufacturing a container filled with a chemical solution according to one embodiment of the present invention, and FIG. 2 shows a burr portion of the blow molded container. FIG. 3 is a partially cutaway front view showing an embodiment in which the container is filled with a drug solution, FIG. 4 is a front view of the container showing an embodiment after the drug solution is filled, FIG. FIG. 5 is an enlarged sectional view showing a mouth portion of the container and a peripheral portion thereof in FIG. DESCRIPTION OF SYMBOLS 1 ... Container, 2 ... Body part, 3 ... Mouth part, 5 ... Split mold, 6 ... Screw thread, 7 ... Burr part, 8 ... Blowing nozzle, 9
…… Flange part, 10… Cutting blade, 11… Chemical liquid filling nozzle, 12… Plug body, 13 …… Low melting point resin, 14… Thread

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B65D 35/00-55/16 B65B 55/00-55/24 B67B 3/00-3/28 B65B 7 / 28

Claims (1)

(57) [Claims] 1. A method for producing a plastic container, comprising: forming a container having a cylindrical mouth by blow molding; filling the container with contents; and sealing the cylindrical mouth with a stopper.
An opening having an engaging portion on the outer peripheral surface is formed by blow molding with a pressurized gas, and a blow hole, which is an insertion mark of a blowing nozzle formed in a burr formed by a parison during blow molding, is melt-sealed to seal the container. With a completely sterile sealed state, when filling the contents, cut off the burr part, open the mouth, fill the contents, fill the contents, and then lock the mouth and the stopper with the mouth. The mouth is locked with a stopper with a low-melting resin interposed between them, and then the container is heat-sterilized, and the low-melting resin is melted by the heat of the sterilization to fix the stopper to the mouth. A method for producing a container filled with contents.