JPH0530703B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Object of the Invention [Field of Industrial Application] The present invention relates to a method of forming a stopper to be attached to the contents outlet of an infusion container or the like.

[Prior Art] When taking out the contents of an infusion solution from an infusion container, a hollow liquid collection needle is inserted through a stopper attached to a content outlet located at the bottom of the container to communicate the inside and outside of the container. It is necessary to keep this liquid collection needle from falling out of the stopper.

For this reason, the stopper is made of an elastic material such as rubber and can be inserted into the stopper body that seals the content outlet, and is capable of holding the inserted liquid collection needle so that it does not fall out. It is generally constructed with an elastic plug material.

Here, this elastic plug material receives a pushing force from the tip side when piercing the liquid collection needle, and receives a force pushing it toward the tip side while removing the contents, so the plug resists both of these forces. It must be configured so that it does not fall off the body.

In addition, it is desirable that the surface of the stopper through which the liquid collection needle is pierced is not exposed to the outside before use, and that it is easy to handle and open.

Conventionally, as such a plug, for example, the first
There is a stopper 101 as shown in FIG.

The plug body 101 includes a flange 102 for adhesion to the container mouth, a first cylinder body 103, and a first cylinder body 10.
3, a lower stopper 105 integrally formed with a lower presser portion 104 extending inwardly from the inner circumferential surface of the second cylinder body 106, and an upper presser member extending inwardly from the inner circumferential surface of the second cylinder body 106. An upper plug body 108 integrally formed with a portion 107 is connected to the first cylindrical body 10.
3 and the second cylindrical body 106 are integrated by fitting, and at the same time, the lower presser part 104 and the upper presser part 107
A rubber stopper 111 is supported with clamping pressure between them.

The first cylindrical body 103 and the second cylindrical body 106 cooperate to form a plug cylindrical portion 112 that forms a cylindrical outer peripheral wall,
A flow path 1 in the direction of the axis 113 is provided inside the stopper cylinder portion 112.
14 may be formed, but the flow path 114 is blocked by a thin film-like partition wall 115. The partition wall 115 is a part of the lower presser part 104.
It can be pierced with a liquid sampling needle, thereby forming a flow path 114.

The lower plug body 105 and the upper plug body 108 are joined by a welding member 116. That is, the welding member 116 is welded across the outer surfaces of the lower plug body 105 and the upper plug body 108 near the height position where the rubber plug 111 is supported in the direction of the axis 113, and joins them together to form a plug body. 110 to prevent the rubber stopper 111 from falling off from the stopper body 110 even if the rubber stopper 111 is pulled outward in the direction of the shaft 113.

In the stopper 101 configured in this manner, when the stopper 101 is adhered to a bottle of an infusion container at the flange 102, the rubber stopper 111 is isolated from the liquid contained therein, making it sanitary.

When using the liquid content, insert the liquid sampling needle into the rubber stopper 11.
1 and the partition wall 115 at the same time, handling is extremely easy. In this state, the rubber stopper 11
1 is held down by the upper and lower holding parts 107 and 104 and does not fall off either inward or outward in the direction of the shaft 113.

[Problems to be solved by the invention] Although the plug 101 is excellent as described above,
Since the welding member 116 is formed and welded by injection molding on the outer surface near the rubber stopper 111, the injection pressure during this molding is applied to the rubber stopper 111, and the rubber stopper 111 is compressed from the outer periphery toward the center. Since the welding member 116 is subjected to a force f, and the magnitude of f varies depending on the distance from the injection gate on the circumference of the welding member 116, the welding member 116 is flexed and deformed in a distorted state, and the injected resin may flow into areas other than the designated areas and solidify. There is a problem that air bubbles may be generated, and there is also a risk that the rubber stopper of the product stopper may easily fall off to one side.

The present invention was developed in view of the above circumstances, and the elastic stopper 111 is hygienic because it can be isolated from the outside air before use, and is extremely easy to handle. An infusion stopper that is stably supported without falling off either inwardly or outwardly, and is free from distortion and deformation of the elastic stopper body, resulting in problems such as resin flowing into unnecessary areas and the generation of air bubbles. The purpose is to provide a body shaping method.

(B) Structure of the invention [Means for solving the problem] In response to this objective, the method for forming an infusion stopper of the present invention includes a stopper cylinder portion whose flow path is closed with an elastic stopper material. A method for molding an infusion stopper, the lower stopper and the second cylinder comprising a first cylinder and a lower holding part extending inward from the inner circumferential surface of the first cylinder, which are integrally molded. and an upper stopper body integrally formed with a body and an upper holding part extending inward from the inner circumferential surface of the second cylindrical body, and arranged concentrically with respect to the center line in the vertical direction of the stopper cylinder part. The first cylindrical body and the second cylindrical body are fitted together to form the plug cylindrical part which can be integrated to form the axial flow passage inside, and the lower presser part and the upper presser part together form the stopper cylinder part. An integration process in which the elastic plug material is clamped to close the flow path, and then a welding member that spans and welds the outer surface of the lower plug body and the outer surface of the upper plug body to join them is radially moved at the welding point. a state in which the mold is in contact with the outer surface of the first cylindrical body and the inner surface of the second cylindrical body in a region surrounded by It is characterized in that it includes a welding process of molding.

Hereinafter, details of the present invention will be explained with reference to the drawings showing one embodiment.

In FIGS. 1, 2, 3, and 4, reference numeral 1 indicates an infusion stopper molded by the infusion stopper molding method of the present invention. To form the infusion stopper 1, first the flange 2 for adhesion to the container opening and the first
A lower stopper body 5 integrally includes a cylinder body 3 and an annular lower presser portion 4 extending inward from the inner circumferential surface of the first cylinder body 3, a second cylinder body 6, An upper plug body 8 integrally formed with an annular upper presser part 7 extending inward from the inner circumferential surface is integrated by fitting the first cylinder body 3 and the second cylinder body 6, As a result, an integration process is performed in which the elastic plug material 11 is supported between the lower presser part 4 and the upper presser part 7 under pressure.

As a result, the first cylindrical body 3 and the second cylindrical body 6 cooperate to form a plug cylindrical portion 12 forming a cylindrical outer peripheral wall,
A flow path 14 extending in the direction of the axis 13 may be formed inside the plug cylinder portion 12, and the flow path 14 is formed of a thin film located along the inner surface of the elastic plug material 11 and integrally formed with the lower presser portion 4. The partition wall 9 is located along the outer surface of the elastic plug material 11 and is formed integrally with the upper holding part 7, and has a pull ring 10 on the outer surface and a cutting score 20 on the inner surface. Since the flow path 14 is heavily blocked, the pull ring 10 is pulled to cut out the score 20 and the septum 9 is removed, and then a hollow liquid collection needle is inserted through the elastic stopper 11 and at the same time, the septum 15 is pierced. It is designed so that it can be opened by.

Thereafter, a welding process for welding the welding member 16 is performed. This process is shown in detail in FIG.
That is, the unwelded plug body 23, in which the lower plug body 5, the upper plug body 8, and the elastic plug body 11 are combined into one body through the above-mentioned integration step, is set on the male mold 22 (see FIG. 5a). ), and a female mold 24 for injection molding placed opposite to this is fitted, and the molten resin is injected and solidified from the gate 25 (Fig. 5b).
A stopper 1 for infusion is obtained.

What is important in this process is that the welding member 16
The welding member 16 is formed at the tip 23a of the unwelded plug body 23 in a state in which the mold 24 for molding is in contact with the inside, and the welding member 16 is formed between the outer surface of the lower plug body 5 and the upper plug body 5. It straddles the outer surface of the body 8 and is welded to join them together. As a result, the injection pressure of the molten resin is received by the mold 24, and the injection pressure is not applied to the elastic stopper 11 portion.

The molding method explained above is shown in Figures 6, 7, and 8.
The infusion stopper 1a shown in FIGS.
It is also applicable to the molding of the infusion stopper 1b shown in FIGS. 11, 12, and 13.

The infusion stopper 1a shown in FIG. 6 does not have a diaphragm 15, and a lower stopper 5a and an upper stopper 8a are fitted together, and an elastic stopper 11a is supported under pressure by the lower support part 4a and the upper holding part 7a. The welding member 16a is molded in the lower part 23b of the unwelded plug, and the injection pressure is received by the mold.

The infusion stopper 1b shown in FIG. 10 has a welded member 16b formed at an axially intermediate portion 23c of an unwelded stopper. In this case as well, the injection pressure for molding is received by the mold.

[Function/Effect] From the above explanation, according to the method for molding the infusion stopper configured as described above, when molding the welding member that joins the lower stopper and the upper stopper, the injection pressure of the resin is adjusted to the molding level. Since it is received by the mold used, no injection pressure is applied to the elastic stopper, and distortion of the elastic stopper is prevented. Therefore, the elastic plug body is stably supported and does not fall off either inwardly or outwardly during use, and there is no problem of resin flowing into unnecessary areas or generating bubbles.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an infusion stopper formed by a method for forming an infusion stopper according to an embodiment of the present invention, and FIG. 2 is a half longitudinal cross-sectional view of the infusion stopper shown in FIG. 1. Figure 3 is a plan view of the infusion stopper shown in Figure 1, Figure 4 is a bottom view of the infusion stopper shown in Figure 1, and Figure 5a shows the state before the welding process. An explanatory diagram, FIG. 5b is an explanatory diagram showing the welding process, FIG. 6 is a longitudinal cross-sectional view showing another infusion stopper formed by the infusion stopper forming method of the present invention, and FIG. FIG. 6 is a plan view of the infusion stopper shown in FIG. 6, FIG. 8 is a front view of the infusion stopper shown in FIG. 6, FIG. 9 is a bottom view of the infusion stopper shown in FIG. 6, and FIG. 10 is a bottom view of the infusion stopper shown in FIG. A longitudinal sectional view showing still another infusion stopper formed by the infusion stopper molding method of the present invention, FIG. 11 is a plan view of the infusion stopper shown in FIG. 10, and FIG. 12 is a top view of the infusion stopper shown in FIG. FIG. 13 is a bottom view of the infusion stopper shown in FIG. 10, and FIG. 14 is a half longitudinal sectional front view of a conventional infusion stopper. DESCRIPTION OF SYMBOLS 1... Infusion stopper, 2... Adhesive flange, 3... First cylindrical body, 4... Lower presser part, 5... Lower stopper, 6...
Second cylindrical body, 7... Upper presser part, 8... Upper plug body, 9
...diaphragm, 10...pull ring, 11...elastic plug material, 1
2... Plug cylinder part, 13... Shaft, 14... Flow path, 15... Partition wall, 16... Welding member, 17... Plug body, 18... Bead part, 21... Mold, 22... Mold, 23... Unwelded plug body , 24... Mold, 25... Gate, 101... Plug body,
102...flange, 103...first cylindrical body, 104
...Lower presser part, 105...Lower stopper, 106...Second
cylindrical body, 107... upper presser part, 108... upper stopper body, 111... elastic stopper body, 112... stopper cylinder part, 113
...Axis, 114...Flow path, 115...Diaphragm, 116...
Welding member, 117...Sealing material.

Claims (1)

[Claims] 1. A method for forming an infusion stopper having a stopper cylinder portion whose flow path is closed with an elastic stopper material, which comprises a first cylinder body and a lower presser extending inward from the inner peripheral surface of the first cylinder body. and an upper stopper body integrally formed with a second cylindrical body and an upper presser part extending inward from an inner circumferential surface of the second cylindrical body. The first cylindrical body and the second cylindrical body may be disposed concentrically with respect to the vertical center line of the stopper cylinder portion and integrated by fitting the first cylindrical body and the second cylindrical body to form the axial flow passage inside. an integration step of forming a stopper cylinder part and sandwiching the elastic stopper material between a lower holding part and an upper holding part to close the flow passage, and then straddling the outer surface of the lower stopper body and the outer surface of the upper stopper body. The welding member is in contact with the outer surface of the first cylindrical body and the inner surface of the second cylindrical body in a region radially surrounding the welding point of the welding member that welds and joins the two, and the welding member is welded. A method for forming an infusion stopper, comprising a welding step of forming the part in a position shifted from the elastic stopper material in the vertical direction.