JP3319810B2 - Hollow container and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow molded hollow container for storing foods, pharmaceuticals, cosmetics, industrial chemicals, and the like, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, this kind of hollow container is closed by closing a blow hole formed by a blow nozzle at the time of blow molding so as to prevent foreign matter or the like from entering before the contents are stored. . However, in this method, when the blow hole is opened at the time of blow molding, there is a drawback that a part of the parison scatters and enters the hollow container, so the present applicant has proposed a method described below. .

As shown in FIG. 6, a body 102 of a hollow container 101, a mouth 103 connected to the body 102, and a mouth 10
3 and a dome-shaped head 104 and a head 104
Molds 108, 1 each having a cavity for forming a bag-shaped portion 105 connected to a narrow portion 106 via a narrow portion 106.
After placing the melted parison between the opened molds 108 and 109 by using a mold 09, the mold is closed, and then a blowing nozzle 107 is inserted into the bag-shaped portion 105 to pressurize the pressurized fluid. The molds 108 and 10 are inserted into a parison.
Press-fit vertically to the mating surface of No. 9 and blow-mold along the cavity. After the molding, the mold is opened and the hollow container 101 is taken out.
The opening communicating with the opening is cut by a heating blade and sealed by welding at the same time to obtain a sealed hollow container (Japanese Patent Laid-Open No. 61-6343).
No. 1).

[0004]

However, Japanese Patent Application Laid-Open No.
According to the method disclosed in Japanese Patent Application Publication No. 1-63431, small pieces of parison pierced by the blowing nozzle do not adhere to the bag-like portion or are prevented from moving in the narrow portion and mixed into the hollow container. Since the narrow portion is exposed, it may be broken when the molded product is taken out or when it comes into contact with another member thereafter. Also, since the bag-shaped portion is merely connected to the head via the narrow portion, the narrow portion is easily bent when cutting the boundary line between the narrow portion and the head with a heating blade, so that cutting work is not easy. There is an unresolved issue.

The present invention has been made in view of the above-mentioned unsolved problems of the prior art, and has an object to provide a hollow container in which the communicating portion is not exposed and the communicating portion is hardly bent, and a method of manufacturing the same. It is intended to be realized.

[0006]

In order to achieve the above object, a hollow container according to the present invention comprises a body, a mouth connected to the body, and a portion serving as an opening of the mouth. A continuous reinforcing portion, a void formed substantially at the center of the reinforcing portion ,
The swelling portion includes a swelling portion that is partitioned from the reinforcing portion, and the swelling portion is connected to the reinforcing portion and a communication portion through a communication passage formed in the communication portion.
It is characterized in that the communicated Te.

Further, the method for manufacturing a hollow container according to the present invention comprises a trunk, a mouth connected to the trunk, a reinforcing portion connected to a portion to be an opening of the mouth, and the reinforcing portion. , A bulge formed in substantially the center of the vacancy, a bulge part in the vacancy partitioned from the reinforcing part, and a bulge formed in the communication part while connecting the bulge and the reinforcing part . Connecting passage
Using a divided mold having a cavity for forming a communicating portion communicating with the mold, a molten parison is arranged between the opened molds, the mold is closed, and the mold is closed by at least the expansion. out portion to form the communicating portion communicating with connecting the said reinforcing portion and the bulging portion,
Next, the parison is blow-molded along the cavity by introducing a pressurized fluid from the bulging portion.

[0008]

The reinforcing portion is formed so as to surround the bulging portion located in the central space, and has a large strength because it is connected to the opening portion of the mouth. For this reason, the communicating portion having relatively low strength is guarded by the reinforcing portion having high strength.

[0009]

An embodiment of the hollow container of the present invention will be described.

FIG. 1 is an elevational view of the hollow container of the present embodiment. The hollow container 1 has a body 2 and a mouth portion having a thread 3a on an outer peripheral surface connected to the body 2. 3, a reinforcing portion 4 connected to a cutting portion 3b which is a portion to be an opening of the mouth portion 3, a void formed substantially in the center of the reinforcing portion 4, and a reinforcing portion 4 in the void. Is provided with a hemispherical bulging portion 7 which is partitioned, and the reinforcing portion 4 and the bulging portion 7 are connected to each other by communicating portions 5 and 6 extending from the bulging portion 7 in the vertical direction in the figure. At the same time, the communication passages 5a, 6
a are formed to communicate with each other.

The bulging portion 7 is provided for introducing a pressurized fluid such as air into the parison through a blowing nozzle (see FIG. 5) or a blowing needle. The pressurized fluid is introduced into the parison by bringing the tip of the blow nozzle into contact with the side wall of the blow nozzle 7 or piercing the blow needle into the parison, and the pressurized fluid is passed through the communication passages 5a and 6a of the communication portions 5 and 6 to the mouth 3.
And it plays the role of leading to the trunk portion 2 side and the reinforcing portion 4 side to expand. Therefore, the blow hole 8 is left on the side wall of the bulging portion 7.

The shape of the bulging portion 7 is not limited to a hemisphere, but may be any shape such as a bag. The blow hole 8 can be sealed with a sealing resin or the like in post-processing, but if the outer surface of the side wall where the blow hole 8 of the bulging portion 7 is opened is formed in a mortar shape as in this embodiment, the sealing resin or the like is formed. Is easier to apply.

Further, the number of the communicating portions is not limited to that of the above-described embodiment, and the number and forming portions thereof can be arbitrarily set according to the size of the hollow container and the moldability of the material used. Although the communicating portions of the above embodiments both form a communicating passage inside, at least one communicating portion having a communicating passage is necessary, and the other communicating portion may not have a communicating passage, Further, a portion other than the communication portion having the communication passage may be formed in a plate shape by compression.

Next, a method for manufacturing the hollow container of the above embodiment will be described.

First, the mold to be used will be described.
As shown in FIG. 5, the mold is a divided type including one mold 10 and the other mold 11, and when the mold is closed, the mold is connected to the body 2 and the body 2. A mouth portion 3 having a threaded portion 3a on the outer peripheral surface, a reinforcing portion 4 connected to a cutting portion 3b which is an opening portion of the mouth portion 3, and a void formed substantially in the center of the reinforcing portion 4 And a swelling portion 7 in the space, which is separated from the reinforcing portion 4, and which connects the swelling portion 7 and the reinforcing portion 4 through a communication passage formed in the communication portion. > A cavity for forming the communicating portions 5 and 6 to communicate with each other is formed, and the one mold 10 regulates the side surface of the bulging portion 7 and pressurized fluid such as air. Is provided internally. Next, the steps will be described.

The molds 10 and 11 are opened, and the melted parison is extruded from an extruder head (not shown) and is disposed between the molds 10 and 11. Pinch.

[0017] Thus, mouth cutting portion 3b to consecutively been reinforced portion 4 of 3, the reinforcing portion of the bulging portion 7 which is divided almost the central cavity and the reinforcing portion 4 be in the voids of Also, upper and lower communication portions 5 and 6 for connecting and communicating the reinforcing portion 4 and the bulging portion 7 are substantially formed.

Next, when a pressurized fluid such as air is introduced through the blow nozzle 12, the pressure causes a blow hole 8 to be formed in the side wall of the bulging portion 7, and the pressurized fluid is press-fitted into the parison and is inserted into the cavity. The hollow container 1 is formed along.
When this blow hole 8 is formed, the parison waste in that part is blown off, but it adheres to the inner wall of the bulging part 7 or intrudes into other parts by the small diameter holes of the communicating parts 5 and 6. Is prevented.

[0019]

Since the present invention is configured as described above, the following effects can be obtained.

Since the communicating portion having relatively low strength is guarded by the reinforcing portion having high strength, the communicating portion is not bent or cut.

Also, since the strength of the reinforcing portion is large, the cutting portion can be cut by grasping the reinforcing portion side, and thus the cutting operation is facilitated.

[Brief description of the drawings]

FIG. 1 is an elevation view of one embodiment of a hollow container of the present invention.

FIG. 2 is a partially enlarged view showing a cross section taken along line AA of FIG. 1 and a portion in the vicinity thereof.

FIG. 3 is a partially enlarged view showing a cross section taken along line CC of FIG. 2 and a portion in the vicinity thereof.

FIG. 4 is an enlarged sectional view showing a section taken along line BB of FIG. 1;

FIG. 5 is a sectional view of a main part of a mold, showing one step of the manufacturing method of the present invention.

FIG. 6 is a sectional view of a main part of a mold, showing one step of a conventional manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow container 2 Trunk part 3 Mouth part 3a Screw part 3b Cutting part 4 Reinforcement part 5,6 Communication part 5a, 6a Communication passage 7 Swelling part 8 Blow hole 10,11 Die 12 Blow nozzle

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 1/00 B65D 1/02 B65D 1/09 B29C 49/00 B29C 49/04 B29C 49/24

Claims (2)

(57) [Claims] 1. A body, and a mouth connected to the body,
A reinforcing portion connected to a portion serving as an opening of the mouth, a void formed substantially at the center of the reinforcing portion, and a bulging portion partitioned from the reinforcing portion in the void. A hollow container, wherein the bulging portion is connected to the reinforcing portion by a communication portion, and is communicated via a communication passage formed in the communication portion. 2. A body, a mouth connected to the body, a reinforcing part connected to a portion to be an opening of the mouth, a void formed substantially in the center of the reinforcing part , A bulging portion which is defined in the cavity and is separated from the reinforcing portion, and a bulging portion which connects the bulging portion and the reinforcing portion and is formed in the communication portion.
Using a divided mold having a cavity for forming a communicating portion communicating through the opened communication passage, disposing the molten Paris between the opened molds, and then closing the mold,
At least the bulged portion by closing the mold, the bulge portion and forming said communicating portion communicating with connecting the said reinforcing part, then the Parisun by introducing a pressurized fluid from the bulging portion A method for manufacturing a hollow container, comprising blow molding along the cavity.