JPH03236932A - Container and method and apparatus for preparing the same - Google Patents

Abstract

PURPOSE:To reduce manufacturing cost by reducing the number of manufacturing processes by integrally molding an internally partitioned bottomed cylindrical blow-moldable part and a mouth part and blowing a high pressure fluid in the molded one to perform blow molding. CONSTITUTION:A mold member 12 and a molding core 13 are respectively heated to definite temp. while an injection mold 10 is clamped in such a state that a split mold 12a is cooled. A molten resin is injected in the cavity C1 and parison cavity C2 formed by the mold member 12 and the molding core 13 from a heated cylinder through a sprue 15 and a gate 14. By this method, the molten resin in the cavity C1 is cooled and solidified after injection to be molded into the mouth part Pb of a container Pa and the screw part Pb1 provided to the outer periphery of the mouth part Pb. Subsequently, a blow mold 20 in a cooled state is combined with the split mold 12a. When air is blown in the molds from an air supply port 13a1, a parison 30 is stretched while expanded to be closely brought into contact with the inner wall surface of a blow cavity 21 to be molded into the shape of the blow cavity 21.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to a container, a method for manufacturing the container, and an apparatus for manufacturing the container, and more specifically, the container is wider inside than the mouth and has a plurality of storage sections formed by a partition wall inside. The container, which is divided into two parts, can be integrally molded including the bottom part and the partition wall part.

<Prior Art> Conventionally, as a container for accommodating a plurality of types of cosmetics, etc., as shown in FIGS. It is known that the device is partitioned into a plurality of sections (two in the drawing) by a partition wall 52.

Since the container is provided with a partition wall 52 inside the container body 50,
It is difficult to use blow molding, which involves blowing high-pressure air into a molded product made by stacking two sheet-like plastic members into a container shape, so injection molding has been adopted.

In the case of manufacturing by this injection molding method, the container body 5
Since the inside of the container 0 is wider than the mouth 51, it is necessary to remove the molded core from the bottom side of the container body 50.
It is not possible to integrally mold the container body 50 including the bottom part.

For this reason, for example, in an injection mold, the container body 5 excluding the bottom part
0 and the partition wall 52 are integrally molded, and the bottom of the container body 50 ← the bottom lid 50a molded in a separate mold is fixed with adhesive, or by ultrasonic bonding, undercut fitting, etc. A method of fixing is used.

<Problems to be Solved by the Invention> However, when fixing the bottom cover 50a with an adhesive or the like, it is difficult to maintain airtightness between each storage chamber partitioned by the partition wall 52, and the container body 50 is This method requires a molding step, a step of molding the bottom lid 50a, and a step of fixing the bottom lid 50a to the container body 50, resulting in a large number of steps and an increase in manufacturing costs.

The present invention has been made in order to solve the problems of the prior art described above, and its purpose is to maintain airtightness between each partitioned housing section, reduce the number of manufacturing steps, and reduce manufacturing costs. It is an object of the present invention to provide a container that can be manufactured at low cost, a method for manufacturing the container, and an apparatus for manufacturing the same.

Means for Solving the Problem> In order to achieve the above-mentioned object distantly, the container of the present invention has a main body portion that is wider inside than the mouth portion and partitioned into a plurality of storage portions by a partition wall, and has a bottom portion. It is characterized in that it is formed integrally with the main body portion and the partition wall.

Further, in the manufacturing method of the present invention, a bottomed cylindrical blow-moldable part whose interior is partitioned into a plurality of parts by a partition wall and a mouth part are integrally molded, and then a high-pressure fluid is blown into the blow-moldable part. It is characterized by blow molding.

Furthermore, the manufacturing apparatus of the present invention integrally injects the mouth part and the bottomed cylindrical blow-moldable part, which has a cavity and a core inserted into the cavity, and whose interior is partitioned into a plurality of parts by a partition wall. It is characterized by comprising an injection molding mold for molding, and a blow molding mold for blow molding the blow moldable part, and forming a passage for blowing high pressure fluid for blow molding into the core. There is.

<Operation> According to the above means, after the blow-moldable part having the bottom and the partition wall is molded, the inside of the blow-moldable part is expanded and stretched by blow molding to form the product shape. There is no need to mold it separately and fix it to the main body of the container.

Therefore, the airtightness between the respective storage sections partitioned by the partition wall is maintained.

<Example> Hereinafter, a preferred example of the present invention will be described with reference to the drawings.

[First Example] Figures 1 to 3 show process explanatory diagrams of the manufacturing method according to this example, and Figures 4 (a), (b), and (C)
indicates a container manufactured by the same manufacturing method.

First, a manufacturing apparatus according to this embodiment will be explained. 1st
In the figures, 10 is an injection mold, and 20 is a blow mold.

The injection mold 10 has a cavity 1 as shown in FIG.
1, and a molding core 13 inserted into the cavity 11, and the cavity 11 and the molding core 13 form a gap C0 that molds the mouth part Pb of the container Pa, and a blow A parison cavity C2 is formed in which the parison 30, which is a moldable portion, is formed.

Here, the upper end portion of the portion of the mold member 12 forming the gap C4 is configured into a split mold 12a that is divided into two parts. On the inner circumferential surface of this split mold 12a, a concave groove 12 is formed to form a threaded portion pb provided on the outer circumference of the mouth portion pb of the container Pa.
aI is formed. Further, a gate 14 and a sprue 15 communicating with the cavity 11 are provided at the bottom of the mold member 12, and molten resin flows from a heating cylinder (not shown) through the sprue 15 and the gate 14 into the cavity 11.
It is ejected inside.

Further, the molded core 13 includes a substrate portion 13a and a core portion 13.
b, and a recess 1 for forming a partition wall Pc portion in the container Pa at the center position of the bottom of the core portion 13b.
3c is formed. Further, the core portion 13b is provided with an air blowing hole 13d that penetrates in the axial direction.

This air blowing hole 1.3d is located in the storage area Pd inside the container Pa.
Figure 4 (a), (
When forming the container Pa (not shown in b) and (C), two pieces are provided. The upper end portion of the air blow hole 13d communicates with the air supply hole 13a+ in the base plate portion 13a.

Further, a countersunk pin 13e is inserted into the air blowing hole 13d so as to be movable in the axial direction. An opening/closing plate 1 for opening and closing an open end 13d of an air blowing hole 13d provided on the bottom side of the molding core 13 is attached to the lower end of the countersunk pin 13e.
3c1 is provided. The outer diameter of the countersunk pin 1.3e is set smaller than the inner diameter of the air blowing hole 13d,
When the countersunk pin 13e is moved downward so that the opening/closing tray 13e1 is separated from the opening end 13dl (see Fig. 2), the high pressure rush for blow molding supplied from the air supply hole 13a1 is caused to contact the countersunk bottle 13e. The air flows into the parison 30 through the gap between the air blowing hole 13d and the open end 13d.

A recess 13a2 into which the split mold 12a fits during mold clamping is provided around the core portion 13b of the substrate portion 13a.

Moreover, the blow molding mold 20 is assembled to the split mold 12a portion when the injection mold 10 is released leaving the split mold 12a portion, and is assembled to the mouth portion p of the container Pa.
Blow cavity 21 having the shape of the main body part except b
is provided.

Next, the manufacturing method of this example will be explained.

First, the mold member 12 and the molding core 13 are heated to a constant temperature, while the split mold 12a is cooled.
As shown in the figure, the injection mold 10 is clamped, and in this state, a sprue 15,
The molten resin is passed through the gate 14 to the gap C1 formed between the mold member 12 and the molding core 13 and the parison gap C2.
eject into. As a result, the molten resin in the gap C1 surrounded by the split mold 12a is cooled and solidified after injection into the container P.
The opening part pb of a and the threaded part Pb on the outer periphery of the opening part pb are formed. Further, the molten resin in the parison gap C2 is molded into a parison 30 maintained at a temperature that allows blow molding.

Next, as shown in FIG. 2, the mold member 12 is removed by rotating or sliding, and the cooled blow molding mold 20 is fitted to the split mold 12a. Thereafter, the plate pin] and 3e are moved downward to separate the opening/closing plate 13e+ from the opening end 13a+ and open it.

When high-pressure air for blow molding is blown from the air supply hole 13a into the parison 30 through the opening end 13d1 from the gap between the dish bottle 1.3e and the air blowing hole 13d, the parison 30 expands and It is stretched and brought into close contact with the inner wall surface of the blow cavity 21, and is molded into the shape of the blow cavity 21.

After that, as shown in FIG. 3, the blow molding die 20 is removed, and the container Pa, which is the molded product, is then removed together with the split mold 12a.
is released from the molding core 13, and then released from the split mold 12a.

As shown in FIGS. 4(a) to 4(C), the container Pa thus formed is partitioned into two parts by a partition wall Pc at the center, and the bottom part Pe is the main body of the container Pa. It is formed integrally with the partition wall Pc.

Therefore, the airtightness between the storage parts Pd partitioned by the partition wall Pc is maintained, and the stored items do not mix or change in quality.

In addition, the manufacturing process is only an injection molding process and a blow molding process, and the molding core 13 for injection molding has air blow holes 13d and air supply holes 13a for blow molding.
1 is provided, and the mold member 12 and the blow molding mold 20 are replaced when changing from injection molding to the blow molding mold 20, so it is not only possible to do so without reducing the manufacturing process, but also to Work efficiency can be improved, and manufacturing costs can be significantly reduced compared to the conventional method of fixing the bottom cover after forming the container body.

In addition to the containers Pa shown in FIGS. 4(a) to (C), for example, as shown in FIGS. 5(a) to (C), three radially extending partition walls Pc are used to divide the interior into three It is also possible to form a partition into the housing portion Pt1.

In this case, the cross-sectional shape of the recess 13c of the molded core 13 is formed to match the planar shape of the partition wall Pc as shown in FIG.
Air blow hole 13 for blowing high pressure air into the area.
Three pieces d may be formed on the molded core 13.

Even in this case, the bottom Pe of the container Pa is
Since it is formed integrally with the main body portion and the partition wall Pc, the airtightness between the respective accommodating portions Pe is maintained.

[Second Embodiment] FIGS. 6 to 8 are process explanatory diagrams showing the manufacturing method of the second embodiment of the present invention, and FIGS. 9(a), 0), and (C)
indicates a container manufactured by the same manufacturing method.

Note that the same components as those shown in Figures 6 to 9 (a), (1)), and (C) are the same as those shown in Figures 1 to 5 (a), (b), and (C). The same reference numerals are used to omit the detailed explanation.

In this second embodiment, a ring-shaped recess 13c1 is formed at the center of the bottom of the molded core 13, and the four parts 1
At 3c1, the partition wall Pc is formed concentrically with the container Pa.

Further, the air blowing hole 13d is formed to penetrate inside the molded core 13 in the axial direction so as to be located outside the recess 13c1. In this case, only one air blowing hole 13d is required, but a plurality of air blowing holes may be provided in order to ensure that high-pressure air is blown in evenly.

The method for molding the container Pa is the same as in the case of the first embodiment. First, the mold member 12 and the molding core 13 are heated to a constant temperature, while the split mold 12a is cooled, as shown in FIG. In this state, the injection mold 10 is clamped as shown in FIG. Inject into the gap C2. As a result, the molten resin in the gap C7 surrounded by the split mold 12'a is cooled and solidified after injection, and the threaded part P on the outer periphery of the mouth part pb and the cough opening part pb of the container Pa is cooled and solidified after injection.
It is molded into bl. Further, the molten resin in the parison gap C2 is molded into a parison 30 maintained at a temperature that allows blow molding.

Next, as shown in FIG. 7, the mold member 12 is removed and the cooled blow molding mold 20 is placed in the split mold 12a.
The parts are assembled and a parison 30 is blow-molded.

After that, as shown in FIG. 8, the blow molding die 20 is removed, and the container Pa, which is a molded product, is then removed together with the split mold 12a.
is released from the molding core 13, and then released from the split mold 12a.

As shown in FIGS. 9(a) to 9(C), the container Pa formed in this manner is partitioned into two concentric storage portions Pd by a ring-shaped partition wall Pc, and has a bottom portion. Pe is formed integrally with the main body portion of the container Pa and the partition wall Pc.

Therefore, the airtightness between the storage parts Pd partitioned by the partition wall Pc is maintained, and the stored items do not mix or change in quality.

Also, the same effects as in the first embodiment can be obtained in the manufacturing process.

In addition, as shown in FIGS. 10(a) to 10(C), the container Pa may be formed by further partitioning the inside of the storage part Pd located on the outside into three parts by three partition walls Pc' extending radially. I can do it. In this case, the cross-sectional shape of the recess 13c1 of the molded core 13 may be formed to match the planar shape of the partition walls Pc, Pc' as shown in FIG.

Even in this case, the bottom Pe of the container Pa is
Since it is formed integrally with the main body portion and the partition wall Pc, airtightness between each housing portion Pd is maintained.

<Effects of the Invention> As explained above, according to the container of the present invention, the inside is wider than the mouth and the inside is partitioned into a plurality of storage parts by a partition wall, and the bottom part is connected to the main body part and the main body part. Since it is formed integrally with the partition wall, it is possible to maintain airtightness between each housing section.

Further, according to the manufacturing method of the present invention, a bottomed cylindrical blow moldable part whose inside is partitioned into a plurality of parts by a partition wall and a mouth part are integrally molded, and then a high pressure fluid is introduced into the blow moldable part. Since blow molding is performed by blow molding, the bottom part and the partition wall part of the container are integrally molded, and it is possible to provide a container that can maintain airtightness between each storage part. Furthermore, it is possible to reduce the number of manufacturing steps and reduce manufacturing costs.

Further, according to the manufacturing apparatus of the present invention, the blow moldable part has a cavity and a molding core inserted into the cavity, and has a bottomed cylindrical blow moldable part whose inside is partitioned into a plurality of parts by a partition wall, and a mouth part. It comprises an injection molding mold for integral injection molding and a blow molding mold for blow molding the blow moldable part, and a passage for blowing high pressure fluid for blow molding into the molding core. Therefore, there is no need to provide a dedicated passage for blowing high-pressure fluid for blow molding separately from the molding core, and a container with an integrated bottom and partition wall can be molded with as little equipment as possible.

[Brief explanation of drawings]

1 to 3 are process explanatory diagrams showing the first embodiment of the present invention, and FIG. 4(a) is a plan view of a container molded according to the first embodiment, and FIG. FIG. 5(C) is a plan view of another container molded according to the first embodiment, FIG. 5(C) is a longitudinal sectional view, and FIG. Figure (C) is a cross-sectional view of the same, and Figures 6 to 8
The figure is a process explanatory diagram showing a second embodiment of the present invention, and FIG. 9(a) is a plan view of a container molded according to the second embodiment.
10(b) is a longitudinal cross-sectional view of the same, FIG. 10(C) is a cross-sectional view of the same, and FIG. 10(a) is a plan view of another container molded according to the second embodiment. 11(C) is a longitudinal sectional view of the same, FIG. 11(C) is a plan view of a container molded by the conventional technique, and FIG. Figure (c) is a cross-sectional view of the same. 10 is an injection mold, 11 is a cavity, 12 is a mold member, 12a is a split mold, 13 is a molding core, 13a is a substrate portion, 13a is an air supply hole, 13b is a part of the core, 13c
, 13c+ is a recess, 13d is an air blow hole, 13d1
13e is an open end, 13e is a tray bottle, 13e+ is an opening/closing tray, 14 is a gate, 15 is a sprue, 20 is a blow molding mold, 21
is a blow cavity, 30 is a blow moldable part (parison), C1 is a void, C2 is a void for parison, Pa is a container, pb is an I'' part, Pc is a partition wall, Pd is a housing part, Pe
is the bottom.

Claims (3)

[Claims] (1) The main body part has an interior wider than the mouth part and is partitioned into a plurality of storage parts by a partition wall, and the bottom part is integrally formed with the main body part and the partition wall. container. (2) A bottomed cylindrical blow moldable part whose inside is partitioned into a plurality of parts by partition walls and a mouth part are integrally molded, and then high pressure fluid is blown into the blow moldable part to perform blow molding. Featured container manufacturing method. (3) Injection molding that includes a cavity and a molding core inserted into the cavity, and integrally injects a bottomed cylindrical blow-moldable part whose interior is partitioned into a plurality of parts by a partition wall, and a mouth part. A container comprising: a mold; and a blow molding mold for blow molding the blow moldable part, and forming a passage for blowing high pressure fluid for blow molding into the molding core. Manufacturing equipment.