JPH0651343B2 - Manufacturing method of plastic container for infusion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a plastic container for transfusion containing an infusion solution for intravenous injection such as blood and plasma substitute solution, and in particular, a plug body is sealed at one end of the container. The present invention relates to a method for producing a plastic container for infusion, in which an injection needle is inserted into the stopper at the time of use to extract the infusion solution in the container.

[Conventional technology]

As the above-mentioned plastic container for infusion, JP-A-63-9
There is one disclosed in Japanese Patent No. 6051.

In this conventional plastic container for infusion, a container body having an opening having a flange at one end is formed by a blow molding method, and a rubber stopper is previously sealed on the flange surface of the opening to form a hat shape. The flange surface of the outer plug is heat-welded to close one end of the container body with the outer plug having the rubber plug.

[Problems to be Solved by the Invention]

In the above conventional method for producing a plastic container for infusion, in addition to the blow molding step for producing the container body, a step for producing a stopper body enclosing a rubber stopper, and the opening of the container body for opening the stopper body. The manufacturing cost was high because it required a plurality of steps such as a step of heat welding to the flange surface of the portion. Further, when the above-mentioned plug body is welded to the container body side, foreign matter such as welding dust easily enters the container body, which is a sanitary problem.

The present invention has been made in view of the above, the welding process of the plug can be omitted and the manufacturing process can be simplified, and foreign matter due to the welding of the plug does not enter the container,
An object of the present invention is to provide a method for producing a plastic container for infusion which can be manufactured hygienically and can be integrally welded to a predetermined position of the plastic container for infusion without peeling it off. Is.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, a method for producing a plastic container for infusion according to the present invention is a method for producing an infusion plastic container in which one end of the container is closed by a stopper, by a blow molding method, in the vicinity of a rubber stopper. A plug body obtained by previously coating a film made of the same material as that of the plastic container is placed in the parison in advance, and this plug body is fused and integrated with the parison at the time of blow molding.

[Action]

The plug body is sealed at a predetermined position of the molded body by clamping the split mold during blow molding. At this time, the plastic coating covering the periphery of the stopper is made to be the same as the plastic of the container body by heat welding.

〔Example〕

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

In the figure, reference numerals 1 and 2 denote split dies arranged so as to face each other on the left and right, and 3 denotes an extrusion die that hangs a parison 4 between the split dies 1 and 2. Cavities for blow-molding the plastic container for infusion are formed on the facing surfaces of the split molds 1 and 2, and these cavities are from the upper side, and the cavities 1a and 2a for plugs and the cavities 1b and 2b for necks are
Body cavities 1c, 2c, bottom cavity 1d,
It consists of 2d.

The plug cavities 1a and 2a are open upward. Further, the bottom cavities 1d and 2d are provided with the blow nozzle 5
It is shaped so as to surround the and pinch off the Parison 4.

Reference numeral 6 denotes a stopper driving device provided downwardly and vertically movable at a position separated laterally from the position where the extrusion die 3 is installed. This device 6 is a mold clamping state of the split molds 1 and 2. And a driving sleeve 8 having a shape that closes the upper sides of the plug cavities 1a and 2a, and a driving urged by a spring 9 so as to be slidable in the axial center portion of the driving sleeve 8 and projecting downward. It consists of a core 10. A vacuum hole 11 is provided at the tip end at the axial center of the driving core 10.

Reference numeral 12 denotes a plug body having a rubber plug inserted into the mold cavity 1a, 2a for the plug body. The plug body 12 is covered with a thin plastic coating 12a made of the same material as the parison 4.

A method of manufacturing the plastic container for infusion according to the present invention using the above apparatus will be described below.

(1) Parison hanging (Fig. 1) Separate the molds 1 and 2, and separate the molds 1 and 2.
The parison 4 is hung down from the extrusion die 3 so as to cover the blowing nozzle 5 while the blowing nozzle 5 is arranged in the lower part between the two.

(2) Clamping and moving The split molds 1 and 2 are clamped, and then the upper part of the parison 4 is cut. Next, the split molds 1 and 2 are moved to the stopper driving position where the stopper driving device 6 is provided.

(3) Plug driving (FIG. 2) The plug driving device 6 is moved upward so as not to interfere with the movement of the split molds 1 and 2, and the plug is attached to the lower end surface of the driving core 10. 12 is adsorbed by the vacuum hole 11.

With the mold halves 1 and 2 that have been clamped moved to the lower side of the stopper driving device 6, the stopper driving device 6 is moved downward to move the stopper 12
Is pushed into the parison 4 through the upper opening of the parison 4, and is positioned in the plug cavities 1a and 2a of the split molds 1 and 2.

(4) Sealing and Blowing of Plug (FIG. 3) The plug driving device 6 is further moved downward to seal the plug cavities 1a and 2a at the lower end of the driving sleeve 8. At this time, the driving core 10 slides against the driving sleeve 8 against the spring 9, and the plug body 12 is held in a pressed state. Then, by the downward movement of the driving sleeve 8, the parison 4'above the stopper body 12 of the stopper body cavities 1a, 2a is confined in the stopper body cavities 1a, 2a to fill the upper side of the stopper body 12, The whole 12 is completely sealed, whereby the outer peripheral side and the side surface of the upper and lower surfaces of the stopper 12 are covered with plastic. At this time, since the plug body 12 is covered with the plastic having the same material value as the material of the Pasulin 4, the plug body 12 is made the same as the plastic of the parison 4 by heat welding.

Then, a pressure fluid is blown from the blowing nozzle 5 to perform blow molding.

(5) Mold release The molds are opened in a state where the molded bodies in the split molds 1 and 2 are solidified to some extent, the blowing nozzle 5 is removed, and the blow hole is closed.

Through the above steps, as shown in FIG. 5, the plug body portion 13a enclosing the plug body 12, the neck portion 13b, the body portion 13c, and the bottom portion 13d.
The infusion liquid plastic container 13 is blow molded.

(5) Infusion filling The infusion plastic container 13 molded in the above step is cut along the line AA at the bottom side end at the filling line to open the bottom, and the infusion is filled from this opening. After that, the opening is closed by heat sealing or the like.

In this infusion filling, since the entire bottom side end of the container 13 is opened and the infusion is filled from here, a predetermined amount of the infusion can be filled at once and in a short time, and bubbles are not entrained, and the cycle In addition to being able to improve the performance, it is possible to eliminate the occurrence of problems in the automatic inspection line due to the inclusion of bubbles.

In the above-described embodiment, an example is shown in which the stopper driving device 6 is provided at a position separated from the hanging position of the parison 4, and the stopper 12 is driven into the upper part of the parison after the mold is clamped by this device. The stopper body is attached to the lower end surface of the extrusion die of the parison 4, and the stopper body 12 is attached to the stopper body cavity 1 during the mold clamping process.
It may be arranged in a and 2a.

FIG. 4 shows this embodiment, in which a plug body suction member 14 is provided at the tip of the extrusion die 3 ', and the plug body 12 is sucked by the plug body suction member 14 and then the diameter larger than that of the plug body 12 is obtained. The parison 4 is extruded and hung down from the extrusion die 3, then the split molds 1 and 2 are tightened, and a pressure fluid is blown from the blowing nozzle 5 to perform blow molding.

According to this embodiment, the plug driving device 6 is not necessary, and the step of moving from the Paris hanging position to the plug driving device is also unnecessary.

〔The invention's effect〕

According to the present invention, the stopper 12 can be sealed in a predetermined position in the infusion plastic container in the blowing step, whereby the welding step of the stopper can be omitted and the manufacturing process can be simplified. Further, foreign matter due to the welding of the plug 12 does not enter the container, and the infusion plastic container can be manufactured hygienically. Further according to the invention,
A plug body, which is obtained by previously coating a film of the same material as the plastic container around the rubber stopper, is placed in the parison in advance and sealed, so that the plug body can be peeled to a predetermined position of the plastic container. It can be welded in one piece without.

[Brief description of drawings]

1, 2 and 3 are sectional views showing the manufacturing process of the first embodiment of the present invention, FIG. 4 is a sectional view showing the second embodiment of the present invention, and FIG. It is a front view of the plastic container for infusion produced by the method of the invention. 1 and 2 are split molds, 1a and 2a are stopper cavities,
3, 3'is an extrusion die, 4 is a parison, 5 is a blowing nozzle, 6 is a plug driving device, and 12 is a plug.

Claims (1)

[Claims] 1. A method for producing a plastic container for infusion by closing one end of the container with a stopper by blow molding, wherein a rubber stopper is preliminarily coated with a film made of the same material as the plastic container. A method for producing a plastic container for infusion, wherein the stopper is pre-arranged in a parison and the stopper is fused and integrated with the parison during blow molding.