JP2923574B2 - Manufacturing method of chemical liquid container - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a disposable liquid medicine container for enclosing a liquid or ointment liquid medicine such as a suppository.

Conventionally, a drug solution such as a suppository is usually sold in the market by being enclosed in a drug solution container with a disposable nozzle, and a user opens the nozzle, inserts it into the anus, and inserts the drug into the container. The entire amount of the drug solution can be extruded and used.

It is preferable that such a drug solution container can easily open the nozzle portion at the time of use, and during storage and the like,
The nozzle section must not be inadvertently opened. Therefore, a chemical solution container is known in which a stopper is protruded from a tip of a nozzle portion via a thin portion, and a cap-shaped or plate-shaped stopper member is attached integrally with the stopper. I have. In this device, the thin portion is easily broken by twisting or causing the opening member with fingers, and the stopper portion can be separated from the nozzle portion to open the nozzle portion.

Problems to be Solved by the Invention According to such a conventional technique, there is a problem that even when the chemical solution container is made by injection molding, it is not always possible to suitably apply the chemical liquid container when it is made by blow molding. That is, in the injection molding, the outer mold and the inner mold are used, and not only the outer surface of the chemical solution container, but also the shape of the inner surface is actively molded by the mold, so that the thickness control of the thin portion is easy, Therefore,
The thickness of the thin portion is optimally set so that the stopper portion does not accidentally come off and can be opened with a small operating force, so that a product of constant quality can be easily mass-produced. On the other hand, in the blow molding, since the inner mold does not exist, the small-diameter thin-walled portion tends to be excessively thick.
Moreover, it is difficult to control this constant, and it is therefore difficult to keep the quality constant.

In addition, blow molding, compared with injection molding,
Not only can the mold cost be small, but it is not necessary to remove the inner mold, so any external shape can be made, and if necessary, a bottomed empty container can also be easily made. Therefore, there is little chance that the inside is soiled before filling the chemical solution, and furthermore, the thickness of the body part is made extremely thin, the overall hardness is reduced, and the remaining amount of the chemical solution at the time of use can be reduced. is there.

Therefore, an object of the present invention is to form a notch mechanically around the base of the stopper after molding, so that even in the case of blow molding, it is possible to easily mass-produce a product of constant quality. It is an object of the present invention to provide a method for manufacturing a chemical solution container.

Means for Solving the Problems According to a configuration of the present invention for achieving the above object, a container body including a hollow cylindrical nozzle portion and a stopper plug projecting from the tip of the nozzle portion is blow-molded to form a container. A circular notch is formed around the base of the plug, a cap having a fitting hole at the top is fitted to the nozzle, and the tip of the plug that penetrates the fitting hole is thermally deformed. The gist is to attach them together.

In addition, an annular concave portion may be formed at the base of the stopper portion, and a drooping ring that fits the concave portion may be formed below the fitting hole. , A plurality of engagement projections can be formed.

Operation With this configuration, the finished liquid medicine container has the nozzle portion sealed by the stopper, but a circular cut is formed around the base of the stopper after molding. The plug portion is continuous with the nozzle portion via a thin portion having a thickness determined by the cutting depth. Therefore, the stopper portion can be easily separated from the nozzle portion by opening the cap integrated therewith in an arbitrary direction or by pushing it upward, and the nozzle portion can be opened.

In the case of blow molding, the diameter of the continuous portion between the stopper and the nozzle is extremely small compared to the main body of the chemical solution container (the portion that stores the chemical solution, the same applies hereinafter). Even if a relief part is made, it is inevitable that the part tends to be unnecessarily thick. However, in the present invention, since the cut is formed mechanically by secondary processing after blow molding, a thin portion having an optimum thickness can be easily formed by appropriately setting the cut depth. .

When a recess is formed at the base of the stopper and a hanging ring is formed at the lower part of the fitting hole, when the cap is fitted to the nozzle, the hanging ring is fitted to the recess to form the nozzle. In contrast, the cap can be positioned correctly, and when the tip of the plug is thermally deformed, the hanging ring fits into the recessed part and the two closely adhere to each other, so that when the cut is formed, Even if a pinhole or the like occurs in the thin portion, it is possible to reliably prevent the leakage of the chemical solution.

If the engaging projection is formed on the upper inner surface of the fitting hole, the engaging strength between the cap and the stopper can be sufficiently increased.

Embodiments Hereinafter, embodiments will be described with reference to the drawings.

The chemical solution container is provided with a cap 20 on the nozzle 11 of the container body 10.
(See FIG. 1).

The container body 10 is formed by projecting a hollow cylindrical nozzle portion 11 to the bottomed body portion 12, for example, using a soft thermoplastic material such as low-density polyethylene,
It is manufactured by blow molding. However, a small-diameter air blowing hole (not shown) is opened at the bottom of the main body 12,
Also, the overall shape of the main body 12 is such that a good finished shape is obtained when the bottom is cut off, filled with a chemical solution and sealed by heat bonding (two-dot chain line in FIG. 1). It has an appropriate streamline.

The container body 10 to be blow-molded has a stopper 13 protruding from the tip of the nozzle 10 irrespective of FIG.
Figure). The spigot 13 is formed concentrically with the nozzle 11 and
At the base of 13, an annular recess 13a having a substantially trapezoidal cross section
Are formed. In this state, the stopper part
13 and the nozzle portion 11 are connected via a lower portion of the recess 13a,
Since the entire circumference of the base of the stopper 13 is continuous, the nozzle 11
Is, of course, not open.

Subsequently, a circular cut 13b is formed at the base of the plug 13 by the cutter F having the ring-shaped cutting edge Fa (FIGS. 2 and 3). The cutter F has a round hole Fb in the center,
The cutting edge Fa is formed on the periphery of the round hole Fb. The inner diameter d of the cutting edge Fa is substantially equal to the outer shape of the stopper 13, and the height h of the cutting edge Fa is set such that when the lower surface of the cutter F hits the tip of the nozzle portion 11 (two-dot chain line in FIG. 2). Cut depth d1 of cut 13b
Is determined to be optimal (FIG. 3).

When forming the cut 13b, the cutter F is advanced while rotating with respect to the container body 10, and the cut 13b causes a thin portion having a predetermined thickness below the cut 13b.
13c can be made.

Next, the cap 20 is fitted to the nozzle portion 11 (third part).
Figure).

The cap 20 is a cap-shaped member in which knurls 21, 21... Are engraved on the outer peripheral portion (FIGS. 3 and 4).
A fitting hole 22 through which the stopper 13 is inserted is formed. Mating hole
A plurality of engaging projections 22a, 22a,... Are formed on the upper inner surface of the upper part 22, and a hanging ring 22b is formed below the fitting hole 22. The shape of the upper inner surface of the cap 20 including the outer surface of the hanging ring 22b is different from that of the nozzle portion 11 including the concave portion 13a.
Shall conform to the shape of the tip of

Next, the plug 13 projecting from the top of the cap 20 is thermally deformed, and the cap 20 is integrally attached to the nozzle 11 (FIG. 5). However, as a means of thermal deformation, for example, softening and pressurizing deformation by a general heater or ultrasonic bonding can be applied. At this time, the hanging ring 22b of the cap 20 fits into the recess 13a of the nozzle 11 and
13a is expanded somewhat in the outer peripheral direction, the tip of the nozzle portion 11 is in close contact with the upper inner surface of the cap 20, and the stopper portion 13 fills the entire fitting hole 22 of the cap 20, so that the cap 20 It is assumed that the volume of the plug 13 is determined so as to be smoothly integrated with the outer shape of the plug.

Thus, the container body 10 with the cap 20 attached
Is cut off at the bottom, opened, filled with a predetermined amount of a drug solution, and sealed by heat bonding to obtain a product (two-dot chain line in FIG. 1).

When using a chemical, the nozzle 20 is opened by twisting the cap 20 lightly and separating the plug 13 (FIG. 6). At this time, the stopper 13 is
And the nozzle part 11
Since the plug 13 is continuous only through the thin portion 13c below the cut 13b (FIG. 3), the thin portion 13c of the stopper 13 is broken by an extremely light operating force and separated from the nozzle portion 11. Thus, the opening 11a can be formed at the tip of the nozzle portion 11. The thin portion 13c may be broken by pushing the cap 20 lightly in the direction of the tip of the nozzle portion 11.

In the above description, the cutter F forming the cut 13b
Generally has a simple cylindrical cutting edge Fa (FIG. 7 (A)). However, the cutting edge Fa may have a height h that is not constant in the circumferential direction (see FIG.
(C)). Since a part of the cutting edge Fa becomes a cutting edge, the sharpness can be further sharpened. The cross section of the blade edge Fa may be a stepped one (FIG. 8B) other than a simple triangular shape (FIG. 8A).

The cutting depth d1 of the cutting 13b by the cutter F is
The stopper 13 may be restricted by abutting the tip of the plug 13 against the inside of the round hole Fb of the cutter F (FIG. 9). Cutting edge
Since the height h of Fa can be arbitrarily set, even if the cutting edge Fa has a shape other than a simple cylindrical shape, the processing, re-polishing, and the like are easy.

The cut depth d1 of the cut 13b is set so that the thickness of the thin portion 13c is optimized. That is, even if there is a vertical concave groove-shaped parting line on the inner surface of the nozzle part 11, no pinhole or the like is generated in the part of the parting line. 13
Must be separated so that the nozzle portion 11 can be opened. When the container body 10 is low-density polyethylene, the diameter of the cut 13b is about 3 mm, and the outer diameter of the cap 20 is about 8 m
As m, the thickness of the thin portion 13c is preferably about 0.1 to 0.2 mm.

Effects of the Invention As described above, according to the present invention, after molding, a circular cut is mechanically formed around the base of the plug to optimize the continuous portion between the plug and the nozzle. Since the thin part can be reliably formed, even if the container body is blow molded, there is an excellent effect that a container having a constant quality can be easily mass-produced.

[Brief description of the drawings]

1 to 6 show an embodiment, FIG. 1 is an explanatory view of the whole structure in a completed state, FIG. 2 is an explanatory view of a notch forming step, FIG. 3 is an explanatory view of a cap fitting step, and FIG. FIG. 5 is a perspective view of a main part of the cap, FIG. 5 is an explanatory view of a cap attaching step, and FIG. 6 is an explanatory view of a use state. 7 (A) to 7 (C) are perspective views showing different cutters, and FIGS. 8 (A) and (B) are XX of FIG. 7 (A) each showing still another cutter. FIG. 3 is an enlarged cross-sectional view corresponding to a line arrow. FIG. 9 is a sectional view corresponding to FIG. 2 showing another embodiment. 10 Container main body 11 Nozzle part 13 Plug part 13a Recessed part 13b Cut 20 Cap 22 Fitting hole 22a Engagement protrusion 22b Hanging ring

Claims (3)

(57) [Claims] 1. A container body having a hollow cylindrical nozzle portion and a plug portion protruding from the tip of the nozzle portion is blow-molded to form a circular cut around the base of the plug portion. ,
A cap having a fitting hole at a top portion is fitted to the nozzle portion, a tip of the plug portion penetrating the fitting hole is thermally deformed, and the cap is integrally attached to the nozzle portion. Manufacturing method of chemical solution container. 2. The method according to claim 1, wherein an annular concave portion is formed at a base of said stopper portion, and a hanging ring adapted to said concave portion is formed below said fitting hole. 2. The method for producing a drug solution container according to claim 1. 3. The method according to claim 1, wherein a plurality of engaging projections are formed on an upper inner surface of the fitting hole.