JP2709354B2 - Method and apparatus for molding liquid container by hollow molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for forming a liquid container by hollow molding, and more particularly, to pressing a parison end portion with a rod projecting from an air blowing nozzle to easily form a thin film on the liquid container. The present invention relates to a novel improvement for integrally forming the same.

[0002]

2. Description of the Related Art Generally, antibiotics and blood products include:
Due to the problem of pharmaceutical stability, it is supplied to medical care as a solid preparation, dissolved immediately before use, and administered intravenously as an injection.In this case, the drug dissolution operation is performed in drug vials sealed with rubber stoppers, respectively. And the solution container are communicated with each other by a hollow double-ended needle having cutting edges at both ends. Therefore, in this communication operation, if each rubber stopper and the double-ended needle are touched to the outside air, there is a risk that the medicine is contaminated. Therefore, various medical containers have been proposed in which the communication operation can be performed in a sealed system. For example, Japanese Patent Publication No. 3-49262 discloses a configuration in which a capsule containing a drug vial and a flexible dissolving solution container are connected by a conduit means, and the conduit means is provided with a communicating means. Also, Japanese Patent Application Laid-Open No. 2-1277 discloses that
There has been disclosed a medical container in which the communication mechanism is improved so that the communication operation can be performed easily and reliably. The present invention
The present invention relates to a dissolving solution container as shown in FIG. 11 of Japanese Patent Application Laid-Open No. Hei 2-1277.
No. 2, Japanese Unexamined Patent Publication No. Hei 4-190133 and Japanese Unexamined Patent Publication No. Hei.
There is an inflation method disclosed in Japanese Patent Application Laid-Open No. 185264/1992. In this inflation method, a base member (corresponding to an insert part) is attached to two film sheet materials or an inflation tube material, and heat sealing or high-frequency sealing is performed as a subsequent process. Welded. In the blow molding method disclosed in JP-B-63-36798 and JP-A-5-92479, the above-described base member is attached to two sheet parisons or tubular parisons.
Blow molding.

[0003]

Since the conventional method is configured as described above, there are the following problems. That is, in the case of the above-mentioned inflation method, in a method in which a die member and a film sheet material or an inflation tube material are bonded by heat sealing or high-frequency sealing, poor welding of both is likely to occur, and the manufacturing process involves two steps of molding and welding. Is required, and labor and time increase, resulting in an increase in cost. In addition, there is a danger of foreign matter or the like being mixed during the sealing operation, which is unsuitable for chemicals. Further, in the case of the above-mentioned blow molding method, in each case, a base member is attached to a parison or a tubular parison, air is blown through the base member, and hollow molding is performed, so that a thin film is formed on the base member. However, it has not been possible to satisfy the requirement to maintain the sealing property and the requirement to form a closure in the base member of the container.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in particular, a parison end is pressed by a rod projecting from an air blowing nozzle to easily form a thin film on a stopper of a liquid container. It is an object of the present invention to provide a method and an apparatus for forming a liquid container by hollow molding, which are formed in the following manner.

[0005]

According to the method of molding a liquid container by hollow molding according to the present invention, a parison from a crosshead is sandwiched between mold cavities, and air is supplied into the parison through an air blowing nozzle. In the method for forming a liquid container by hollow molding, whereby a liquid container made of a hollow molded product is obtained, the parison end of the parison located at the end of the cavity is operably connected to the air blowing nozzle. This is a method of forming a thin film on the end of the parison by deforming the provided bar.

More specifically, the bar is a method of forming the thin film before, simultaneously with, or after blowing the parison.

More specifically, after the air is blown into the parison by the air blowing nozzle and pre-blown, the bar is pressed against the end of the parison, and then the parison is blow-molded. is there.

More specifically, there is provided a method for controlling the thickness of the thin film by variably setting a descending stroke at which the rod descends.

More specifically, there is a method in which the air blowing nozzle is positioned above the mold and the rod is lowered.

More specifically, there is provided a method in which the air blowing nozzle is positioned below the mold and the rod is raised.

The apparatus for molding a liquid container by hollow molding according to the present invention is characterized in that a parison from a crosshead is sandwiched between mold cavities, and air is supplied into the parison through an air blowing nozzle to form a hollow molded article. In a molding apparatus for a liquid container by hollow molding so as to obtain a liquid container comprising: a rod body operably provided by an actuating means provided in the air blowing nozzle, wherein the rod body is provided in the cavity. It is configured to be pushed into

More specifically, the rod is located at the axis of the air blowing nozzle.

More specifically, the operating means is constituted by an air or hydraulic cylinder.

[0014] More specifically, the operating means is constituted by a servomotor and a gear.

[0015]

In the method and apparatus for forming a liquid container by hollow molding according to the present invention, the parison hanging from the crosshead is sandwiched by a mold, the mold is closed and the mold is closed, and the mold is positioned at a position corresponding to the air blowing nozzle. Move up to. In this state, the air blow nozzle is driven into the parison, and a small amount of air is blown into the parison before the original blow molding to inflate the parison. Next, in this state, by pushing the rod in the air blowing nozzle into the parison, the tip of this rod presses the end of the parison located at the end of the cavity. A thin film is formed. Thereafter, after the cooling period has elapsed, the mold is opened to form a liquid container formed of a hollow molded product having a thin film at one end.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method and an apparatus for forming a liquid container by blow molding according to the present invention will be described below in detail with reference to the drawings. In the figure, reference numeral 1 denotes a crosshead connected to an extruder 2, and a mold 3 which is openable and closable is disposed below a nozzle port 1a of the crosshead 1. The mold 3 is configured to reciprocate along the arrow A by moving means (not shown) so as to correspond to the air blowing nozzle 10 provided adjacent to the crosshead 1.

The air blowing nozzle 10 is configured as shown in FIGS. That is, in a through hole 12 formed in the axis of the cylindrical main body 11 of the air blowing nozzle 10, a rod 13 having a round bar shape or the like is operably provided so as to be able to move up and down. A nozzle 16 communicating with a supply port 15 for supplying a pressurized fluid 14 such as air is formed at an outer position, and an inlet 18 and an outlet 1 for circulating a cooling medium 17 are provided at this outer position.
9 is formed.

An operating means 21 such as an air cylinder is mounted on an upper portion 11a of the cylindrical main body 11 via a holding member 22, and the rod 13 can be moved up and down by the operating means 21. ing.

The cylindrical body 11 is vertically movable by an actuator 31 such as an air cylinder fixed to a base 30 of a hollow molding machine (not shown). In addition,
The above-mentioned operating means 21 is not limited to the configuration of FIG.
For example, as shown in FIG.
The rod body 13 is connected to a moving nut 34 provided on a screw screw 33 of a mounting body 32 provided at a, and the screw screw 33 is driven via a servomotor 35 and a pair of gears 36 and 37. In this case, the same operation as in FIG. 10 can be obtained.

Next, the case of performing hollow molding using the apparatus for molding a liquid container by hollow molding having the above-described configuration will be described. First, the heated and melted parison 1A discharged from the extruder 2 through the crosshead 1 hangs between the cavities 3a and 3b of the mold 3 in the mold open state shown in FIGS.
Next, as shown in FIG. 3, after closing the mold 3 and closing the mold, the parison 1A is cut into a predetermined length by the cutter 1B.

In the state described above, the mold 3 is moved to a position immediately below the air blowing nozzle 10 by a moving means (not shown) as shown in FIGS. 4 and 5, and the actuator 31 shown in FIG. The air blowing nozzle 10 is driven into the parison 1A, and blows the pressurized fluid 14 from above the parison 1A into the inside to blow the parison 1A.

In the case described above, when the operating means 21 shown in FIG. 10 is operated slightly before blowing the parison 1A, at the same time as blowing, or after blowing, the tip 13a of the bar 13 is turned on. However, as shown in FIGS. 6 to 8, the front end 13 a of the parison 1 A of the parison 1 A covering the ends 3 aA and 3 bA of the cavities 3 a and 3 b is particularly pressed as shown in FIG. As a result, the parison end 1Aa is crushed and partially thinned,
A thin film 41 is formed. In this case, the burr 42 protrudes from the upper part 3A and the lower part 3B of the mold 3.

The parison 1A is pressed against the inner surfaces of the cavities 3a and 3b by
a, 3b are formed along the inner surface. After a predetermined time,
The parison 1A is cooled and solidified, and when the mold 3 is opened after the pressure fluid 14 is discharged, as shown in FIG.
The liquid container 40 composed of a hollow molded article having the following formula is obtained.

In the above configuration, the case where the air blowing nozzle 10 is disposed above the mold 3 and the rod 13 is lowered from above has been described.
May be positioned below the mold 3 and the rod 13 may be raised from below.

Further, as shown in FIG.
Since the height H of the rod 1 is constant by the mold 3,
The thickness of the thin film 41 can be controlled to an arbitrary thickness by adjusting the stroke of the third operating means 21. Note that the parison 1A
By using the liquid container 40 upside down during molding, a liquid container 40 composed of a hollow molded article having a thin film 41 in the upper part can be obtained. The chemical solution outlet 40b disclosed in FIG. 1 of JP-A-2-1277 is attached. further,
As an actual use example, the liquid container 40 is shown in FIG.
As shown in FIG.
Connected via a liquid passage 52 to a capsule 51 having
By actuating the hollow needle 53 provided in the capsule 51 to break the thin film 41, the solid preparation in the drug vial 50 falls into the liquid container 40 to obtain a predetermined drug solution.

[0026]

The method and apparatus for molding a liquid container by hollow molding according to the present invention are configured as described above, so that the following effects can be obtained. That is, by the hollow molding, it is possible to integrally mold the thin film in the hollow molding machine without forming a thin film that seals the liquid passage in a separate process, which reduces labor and time involved in the manufacturing process of this type of container. , Cost reduction can be achieved. In addition, since the thin film is integrally formed, there is no defective bonding or the like, and the quality can be improved. In addition, by molding with a hollow molding machine installed in a clean room, a sanitary safe container free of foreign matter can be produced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an apparatus for molding a liquid container by hollow molding according to the present invention.

FIG. 2 is a configuration diagram of FIG. 1 as viewed from the side.

FIG. 3 is a configuration diagram showing a mold closed state.

FIG. 4 is a configuration diagram showing an air blowing nozzle driving state.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a configuration diagram showing a state where a rod is pushed in.

FIG. 7 is a structural view of FIG. 6 as viewed from the side.

FIG. 8 is a cross-sectional view of a main part showing a rod body pushed-in state in an enlarged manner.

FIG. 9 is a cross-sectional view showing a liquid container.

FIG. 10 is an enlarged sectional view showing an air blowing nozzle.

FIG. 11 is a sectional view taken along the line YY of FIG. 10;

FIG. 12 is a configuration diagram showing a bottom surface of FIG. 10;

FIG. 13 is a sectional view showing another embodiment of the main part of the air blowing nozzle.

FIG. 14 is a cross-sectional view showing an actual use example.

[Explanation of symbols]

 Reference Signs List 1 cross head 1A parison 1Aa parison end 3 mold 3a, 3b cavity 3aA, 3bA end 10 air blowing nozzle 13 rod 21 operating means 35 servomotor 36, 37 gear 40 liquid container 41 thin film

Claims (10)

(57) [Claims] A parison (A) from a cross head (1) is sandwiched between cavities (3a, 3b) of a mold (3), and an air blowing nozzle (1) is sandwiched between the cavities (3a, 3b).
0) through the hollow parison (1A) by supplying air into the parison (1A) to obtain a liquid container (40) made of a hollow molded product, the method of forming a liquid container by hollow molding, wherein the cavity (3a, The parison end (1Aa) of the parison (1A) located at the end (3aA, 3bA) of the air blow nozzle (1
A method for forming a liquid container by hollow molding, characterized in that the thin film (41) is formed on the parison end (1Aa) by deforming the rod (13) operably provided in (0). 2. The thin film (41), wherein the bar (13) forms the thin film (41) before, simultaneously with or after blowing the parison (1A). A method for forming a liquid container by hollow molding according to the above. 3. After the air is blown into the parison (1A) by the air blowing nozzle (10) and pre-blown, the rod (13) is pressed against the parison end (1Aa), The method for molding a liquid container by blow molding according to claim 1 or 2, wherein blow molding of the parison (1A) is performed. 4. The film thickness of the thin film (41) is controlled by variably setting a descending stroke at which the rod (13) descends. A method for forming a liquid container by hollow molding. 5. The air injection nozzle (10) is connected to the mold (3).
The method for forming a liquid container by hollow molding according to any one of claims 1 to 4, wherein the rod (13) is moved downwardly. 6. The air injection nozzle (10) is connected to the mold (3).
The method for forming a liquid container by hollow molding according to any one of claims 1 to 4, wherein the rod body (13) is raised below the base. 7. A parison (A) from a crosshead (1) is sandwiched between cavities (3a, 3b) of a mold (3), and an air blowing nozzle (1) is held.
(0) through the air blow nozzle (1A) to obtain a liquid container (40) made of a hollow molded product by hollow molding to obtain a liquid container made of a hollow molded product, the air blowing nozzle ( 10) is provided with a rod (13) operably provided by an operating means (21), and the rod (13) is configured to be pushed into the cavity (3a, 3b). A molding device for liquid containers by hollow molding. 8. The bar (13) is connected to the air blowing nozzle (10).
8. The apparatus for molding a liquid container by hollow molding according to claim 7, wherein the apparatus is located at the axis of the liquid container. 9. The apparatus for molding a liquid container by hollow molding according to claim 7, wherein said operating means comprises an air or hydraulic cylinder. 10. The operating means (21) includes a servo motor (3).
8. The system according to claim 7, wherein said gear comprises a gear and a gear.
Or a molding apparatus for a liquid container by hollow molding according to 8.