JPH0710568B2 - Method for manufacturing stopper body including rubber stopper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a sugar infusion agent, an electrolyte infusion agent, a plasma extender, an osmotic diuretic agent, an amino acid infusion agent, a fat emulsion, a high-calorie nutrition agent, and the like. The present invention relates to a method for producing a stopper body containing a rubber stopper for sealing a mouth portion of a plastic container for a fluid for a fluid such as a fluid for a vein or an intestine or a plastic container for a fluid for storing a blood or the like. .

[Prior Art] In general, in a plastic container for ring fluid or blood, the mouth of the container is sealed with a plastic plug body containing a rubber plug inside (Jitsuko Sho 58-3739).
(See Publication No. 6).

[Problems to be Solved by the Invention] As described in the above publication, in the conventional plastic plug of this type of plastic container, a rubber plug is inserted into a mold and a plastic plug is injection-molded. The rubber stopper contained in the stopper is a flat plate, and since the peripheral portion thereof is simply sandwiched between the stoppers, an injection needle is attached to the rubber stopper. There is a possibility that the rubber stopper may fall out of the stopper due to the bending of the rubber stopper when piercing.

Therefore, in order to prevent the rubber stopper from falling off, as shown in FIG. 5, an annular recessed groove 103 is formed in the peripheral portion of the rubber stopper 102 contained in the upper stopper 101, and injection molding is performed in the upper stopper 101. Stopper 10
By devising a part of 4 into the annular recessed groove 103, it was devised that the engagement of the rubber plug 102 with the plug body is strengthened.

By the way, the rubber stopper 102 having high elasticity is deformed by the pressure when the lower stopper 104 is injection-molded, and the rubber stopper 102 and the lower stopper 104 are deformed.
Since molten resin permeates between the mold and the cavity of the mold forming a molding defect, the rubber plug 102 is compressed in advance by the mold by the amount c that suppresses its elasticity.
Must be injection molded, for that purpose, a rubber stopper
Due to the compressive strain of 102, a part of the annular groove 103 is closed, and the lower stopper 10
The molten resin at the time of injection molding 4 does not completely enter the annular concave groove 103, and a cavity 105 is formed in the annular concave groove 103, and the rubber plug 102
It was found that the retaining effect of the was impaired.

Therefore, in view of the problem in the stopper body having the structure shown in FIG. 5, the present invention compresses only the central portion of the rubber stopper with a core mold for forming the lower stopper and injection-molds the lower stopper. By doing so, even if it is compressed to suppress the elasticity of the rubber stopper, the compression strain does not spread to the concave groove in the peripheral portion, and moreover, the molten resin is completely allowed to enter the annular concave groove, Manufacture for obtaining a stopper body containing a rubber stopper that can firmly prevent the falling of the stopper even when the rubber stopper is bent when the injection needle is pierced into the rubber stopper. The method is proposed here.

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

That is, that is, the upper plug is injection-molded in advance using a split mold composed of an upper mold and a lower mold, then the lower mold is pulled out, and inside the injection-molded upper plug, a peripheral portion of the lower surface is formed. A rubber mold having an annular groove formed therein is attached to the core mold, and a core mold having a projection for compressing the central part of the rubber plug and a cavity for forming a lower plug on the outer peripheral surface of the core mold is compressed by the projection. As described above, it is mounted on the upper mold to seal the lower plug forming cavity, and then a molten resin is injected into the lower plug forming cavity to form a lower plug for sandwiching the rubber stopper with the upper plug. And a method for producing a stopper body containing a rubber stopper.

[Operation] According to the method for manufacturing a stopper body including a rubber stopper according to the present invention, the rubber stopper is mounted in the pre-injection-molded upper stopper, and the rubber stopper is formed by the core mold for molding the lower stopper. Since the lower plug is injection-molded with only the central part of the rubber being compressed, the elasticity of the rubber plug is suppressed, but the compression strain does not spread to the annular concave groove in the peripheral part, and therefore the molten resin has an annular concave shape. The lower plug is formed in a state where the rubber plug completely enters the groove, and the rubber plug is in a state of being firmly engaged with the plug body.

[Embodiment] An embodiment of a method for manufacturing a stopper body including a rubber stopper according to the present invention will be described with reference to the drawings.

In FIG. 1, 1 is an upper mold, 2 is a lower mold, and these upper mold 1 and lower mold 2 constitute a split mold 3 for injection molding a plastic upper plug. There is. This split mold 3 is of a vertical split type, and the split mold 3
Cavity 4 that forms an upper plug inside it with the inside closed
Are formed. A mold 6 for forming a pull ring is detachably attached to a hole 5 formed in the central portion of the upper surface of the upper mold 1, and 7 is a pull ring forming portion. The lower mold 2 has an injection port 8 in the lower part thereof, and a score forming projection 9 is formed on the upper surface thereof.

In order to perform injection molding of the upper plug 10 using the split mold 3, the split mold 3 is closed as shown in FIG. 1, and the molten thermoplastic resin is injected and filled from the injection port 8 into the cavity 4. As shown in FIG. 2, the cavity 4 of the split mold 3
The upper plug 10 is formed together with the pull ring 11.

Next, when the upper plug 10 is first formed in this way, the lower mold 2 is pulled out, and the rubber plug 12 is mounted in the upper mold 1 (see FIG. 2). The rubber plug 12 has an annular groove 13 formed in the peripheral portion of the lower surface thereof, and a shallow recess 14 formed in the central portion of the lower surface, which is inward of the annular groove 13 by b. Then, as shown in FIG. 3, the core mold 15 is mounted. The core mold 15 includes a recess 14 at the center of the lower surface of the rubber stopper 12.
Corresponding to, has a protrusion 16 that compresses that portion by a,
The outer peripheral surface of the projecting portion 16 serves as a cavity 17 for injection-molding a lower stopper, and an injection port 18 is provided on the lower surface thereof. After mounting the core mold 15, the molten thermoplastic is injected from the injection port 18 into the sealed cavity 17 to form the lower plug 19 with the rubber plug 12 sandwiched between the upper plug 10. Therefore, when the core mold 15 is pulled out, the compression of the central portion of the rubber stopper 12 is removed, and that portion is compressed a.
Only by being restored downward, a plug body containing the rubber plug 12 is formed as shown in FIG. 20 is the score. In addition,
In FIG. 4, 21 is the mouth of the container, and the plug is welded and integrated with the mouth 21 of the container.

High-density polyethylene, polypropylene, or a mixture of these with an inorganic filler such as calcium carbonate is used as the thermoplastic for molding the plug. The rubber elastic material forming the rubber plug 12 is an olefin-based, styrene-based, amide-based, urethane-based, ester-based, or other elastomer, synthetic rubber such as silicon rubber, butyl rubber, or isoprene rubber, or natural rubber.

According to the method for manufacturing a stopper body containing a rubber stopper as described above, the rubber stopper 12 is mounted in the pre-injection-molded upper stopper 10 and the rubber stopper 12 is formed by the core mold 15 for molding the lower stopper 19. Since the lower stopper 19 is injection molded with only the central part of the
Although the elasticity of 12 is suppressed, the compressive strain does not spread to the annular concave groove 13 in the peripheral portion, so that the lower plug 19 is formed in a state where the molten resin completely enters the annular concave groove 13, and the rubber plug 12 Is firmly engaged with the stopper. For this reason,
Even when the rubber stopper 12 bends when the rubber stopper 12 is pierced with an injection needle, a stopper body capable of completely preventing the rubber stopper 12 from coming off can be obtained.

[Effect of the Invention] According to the method for producing a stopper body including a rubber stopper according to the present invention, the upper stopper is pre-injection-molded using a split mold including an upper mold and a lower mold, and then the lower mold is used. After removing the mold, attach a rubber stopper with an annular groove on the periphery of the lower surface inside the injection-molded upper stopper. A core mold having a forming cavity is attached to the upper mold so that the protruding portion compresses the rubber stopper, the lower stopper forming cavity is sealed, and then the molten resin is placed in the lower stopper forming cavity. To form a lower stopper that sandwiches the rubber stopper with the upper stopper, so that even if the rubber stopper is compressed to suppress its elasticity, the compression strain does not spread to the annular recessed groove in the peripheral portion. Allows molten resin to completely enter the concave groove to firmly engage the rubber plug with the plug It is possible to obtain a stopper body including a rubber stopper capable of completely preventing the rubber stopper from slipping off even when the rubber stopper is bent when the injection needle is pierced into the rubber stopper.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical cross-sectional view of a split mold for injection-molding an upper stopper, and FIG. 2 shows a mode in which a rubber stopper is inserted after the upper stopper is molded. Longitudinal section,
FIG. 3 is a vertical cross-sectional view showing a mode in which a core mold for injection molding the lower plug is mounted, FIG. 4 is a vertical cross-sectional view of the molded plug body, and FIG. 5 explains the problem of the present invention. FIG. 1 ... upper mold, 2 ... lower mold, 3 ... split mold, 4 ...
Cavity, 8 ... Injection port, 10 ... Top plug, 12 ... Rubber plug, 13 ... Annular groove, 15 ... Core mold, 16 ... Projection part,
17 …… cavity, 18 …… injection port, 19 …… bottom stopper

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29K 21:00 B29L 31:56

Claims (1)

[Claims] 1. An upper plug is injection-molded in advance by using a split mold composed of an upper mold and a lower mold, and then the lower mold is pulled out so that the inside of the injection-molded upper plug is around the lower surface. A rubber mold having an annular groove formed in its part is attached, and a core mold having a protrusion for compressing the center of the rubber stopper and a cavity for forming a lower stopper on the outer peripheral surface of the core mold is compressed by the protrusion. To the upper mold to seal the lower plug forming cavity,
Next, a method for producing a stopper body containing a rubber stopper, characterized in that a molten resin is injected into the lower stopper forming cavity to form a lower stopper that sandwiches the rubber stopper with the upper stopper.