JPH11189231A - Sealed hollow container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a sealed hollow container in which a blowing hole is sealed completely by a sealing section of thick wall and large mechanical strength and the yield at the time of manufacture is high. SOLUTION: A sealed hollow container 1 is manufactured by blow molding a body section 2, a mouth section 3 with a screw section 3b on the outer peripheral face formed continuously on the body section 2 and a head section 3a formed continuously on a section 3a forming an opening section of the mouth section 3 and removed at the time of filling a content and then sealing a blowing hole formed on the head section 4 by a sealing section 6. The sealing section 6 is formed of a base section 6a of thick wall protruded from a bottom face 5a of a recessed section 5 recessed to the inner side of a chamber formed on a site other than a parting line of the head section 4 toward the outside of the chamber and a swelling section 6b formed continuously on the end of the base section 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to prevent contamination of bacteria and foreign substances by sealing the contents before filling.
The present invention relates to a hermetically sealed hollow container that is configured to be opened at the time of filling contents and filled with contents.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional bottle whose inside is sealed. As shown in FIG. 4A, the bottle 100 includes a bottle body 101, a mouth portion 102 having a screw portion 103 on an outer peripheral surface connected to the bottle body 101,
A removing head 104 which is removed at the time of filling the contents connected to the portion to be the opening of the mouth 102,
In the recessed surface 105 provided in 4, there are formed closing portions 106 and 107 for closing each air hole.

The closures 106 and 107 of the bottle 100
Are divided molds 111 and 11 as shown in FIG.
2 and the hollow needles 115 and 116 are pierced into the recessed surface 105 of the removal head 104 to remove the bottle 10.
0 is blow-molded, and then the blowing needles 114 and 115 are pulled out of the bottle 100 so that the air holes 11 in the recessed surface 105 are formed.
It is formed by melting a hot plate by abutting a hot plate on a resin protruding outward from the periphery of 3,114 (see Japanese Patent Application Laid-Open No. 9-58645).

[0004]

In the above prior art,
Since the resin that protrudes outward from the periphery of the air hole for forming the closure is thin and has a small amount of resin, the formed closure has a small thickness and low mechanical strength. In some cases, a sufficient amount of resin to completely close the air hole cannot be secured, and a defective product with incomplete sealing occurs, resulting in a problem that the production yield is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has been described in detail. It is an object of the present invention to realize a sealed hollow container having a good yield at the time.

[0006]

In order to achieve the above object, a sealed hollow container of the present invention comprises a body, a mouth connected to the body, and a content connected to the mouth. After blow-molding the head removed at the time of filling the article, in a sealed hollow container in which the blowing hole formed in the head is sealed by a closing part, the closing part is other than on the parting line of the head. And a thick base protruding outward from the bottom surface of the recess formed on the indoor side formed in the portion and a bulge connected to the tip of the base.

Further, a thick-walled blowing tubular portion protruding outward from the bottom surface of a recess surrounding the periphery of a blowing hole formed by vacuum suction during blow molding is heated after blow molding. It is formed by crushing.

[0008]

FIG. 1 shows a sealed hollow container according to one embodiment. The sealed hollow container 1 includes a body portion 2, a mouth portion 3 having a threaded portion 3 b on an outer peripheral surface connected to the body portion 2,
After blow molding a head 4 removed at the time of filling the contents, which is connected to a portion 3a to be an opening of the mouth 3, the head 4
Is sealed by a closing portion 6 described later.

The closing portion 6 has a thick base portion 6a protruding to the outside of the room from the bottom surface 5a of the recessed portion 5 formed in a portion other than on the parting line of the head portion 4 and recessed toward the inside of the room, and a tip of the base portion 6a. And a flange-shaped bulging portion 6b continuously provided at the center.

As shown in FIGS. 2 and 3, the closing portion 6 is provided with a recessed portion 5 recessed toward the interior of the room and a bottom surface 5a thereof from the bottom surface 5a to a portion other than on the parting line of the head 4 during blow molding. Is formed, and a blow hole 7b formed when pressurized fluid is press-fitted through the inner diameter portion of the blow cylindrical portion 7 is formed into the blow hole 7b after blow molding. It is formed by heating and crushing the surrounding blowing tubular portion 7.

Next, a method of manufacturing the sealed hollow container shown in FIG. 1 will be described.

First, the mold to be used will be described.
As shown in FIG. 2, the mold is of a split type including one mold 11 and the other mold 12, and is configured as described below.

The cavity surface 11a of one mold 11 and the cavity surface 12a of the other mold 12 form a cavity that regulates the outer surface of a hollow container 20 having a later-described blow-in tubular portion 7 when the mold is closed. In the cavity surface 11a of one of the molds 11, a projection 13 for forming a recess 5 which is recessed toward the room is provided at a portion other than on the parting line of the head 4. .

The protruding portion 13 is provided with an insertion hole 18 penetrating in a direction perpendicular to the parting line L.
A suction nozzle 14 having an inner diameter in which an annular suction passage 16 is formed between the insertion hole 18 and the blow nozzle 15 inserted at the center is inserted. And the suction nozzle 14
A permeable member 17 is fitted to the inside of the inner diameter portion at a predetermined distance from the front end so as to close the suction passage 16. As a result, the suction nozzle 1
4 and an annular recess 21 surrounded by the tip of the blowing nozzle 15 and the permeable member 17 are formed.
Thus, the outer surface of the thick-walled blowing tubular portion 7 protruding from the bottom surface 5a of the recess 5 to the outside of the room is regulated.

The gap (width) between the inner surface of the suction nozzle 14 and the outer surface of the blowing nozzle 15 in the recess 21 is preferably set to be about twice the wall thickness of the parison 30.

Next, the steps will be described.

(1) As shown in FIG. 2 (a), one mold 11 and the other mold 12 are opened, and a melt made of a thermoplastic resin is fed from an extrusion head of an extruder (not shown). After the parison 30 is extruded and arranged between the molds 11 and 12, the mold is closed and the parison 30 is clamped.

In this step, the outer diameter of the parison 30 is preferably set so that the outer peripheral surface of the paris 30 abuts on the tip end surface of the protrusion 13 of one of the molds when the mold is completely closed.

(2) After the above (1), FIG.
When vacuum suction is performed by a vacuum source (not shown) through the suction passage 16, a part of the parison 30 is pulled into the recess 21 in a double folded state, and the thin bottom is formed. A thick blowing tubular portion 7 surrounding the wall 7a is formed.

(3) After the above (2), FIG.
As shown in FIG. 5, when a pressurized fluid is supplied from a pressurized fluid supply source (not shown) via a blow nozzle 15, a blow hole 7b is opened in the bottom wall 7a, and the pressurized fluid is introduced into the parison 30 and The parison 30 has the cavity surface 11a,
The hollow container 20 is blow-molded by expanding along 12a.

In this step, since the blowing hole 7b is opened in the thin bottom wall 7a, the blowing hole 7b can be opened without the molten resin protruding into the room side of the head 4.

(4) After the above (3), the mold is opened after cooling in a mold, and the hollow container 20 is taken out and the burr 30 is removed.
a, and as shown in FIG.
Is placed on a jig 40 with the side of the head 4 opposite to the concave portion facing downward, and the blowing tubular portion 7 is heated by a heating means (not shown) such as hot air, a heater, or high-frequency heating. 7 and the heat source are indirectly heated in a non-contact state, and then crushed in the axial direction by an unheated low-temperature pressing tool 41 to form the above-described closing portion 6 to completely seal the blowing hole 7b. A closed sealed hollow container 1 is obtained.

[0023]

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

The blow hole is completely sealed by a closed portion having a large mechanical strength consisting of a thick base portion and a bulge portion connected to the tip of the base portion, and the yield during manufacturing is significantly improved.

[Brief description of the drawings]

FIG. 1 shows a sealed hollow container according to one embodiment;
(A) is a front view, (b) is a partial sectional view along the AA line of (a).

FIG. 2 shows a method for manufacturing the sealed hollow container shown in FIG.
It is explanatory drawing which shows the blow molding process of the hollow container before closing a blowing hole.

FIG. 3 shows a method for producing the sealed hollow container shown in FIG.
It is explanatory drawing which shows the sealing process which seals the blowing hole of the blown hollow container.

4A and 4B show an example of a conventional sealed bottle, wherein FIG. 4A is a partial perspective view of a main part, and FIG. 4B is a schematic sectional view of a blow molding die.

[Explanation of symbols]

 Reference Signs List 1 sealed hollow container 2 trunk 3 mouth 3a opening 3b screw 4 head 5 dent 5a bottom 6 closing 6a base 6b bulging part 7 cylindrical part for blowing 7a bottom wall 7b blowing hole 11 Mold 12 the other mold 11a, 12a cavity surface 13 projecting part 14 suction nozzle 15 blowing nozzle 16 suction passage 17 air-permeable member 18 insertion hole 20 hollow container 30 parison 30a burr 40 jig 41 jig 41

Claims (2)

[Claims] 1. A body, and a mouth connected to the body,
After blow-molding the head removed at the time of filling the contents connected to the mouth portion, in a sealed hollow container in which a blowing hole formed in the head portion is sealed by a closing portion, A thick base protruding outward from the bottom of a recessed portion formed in the room other than on the parting line of the head and depressed toward the inside of the room, and a bulging portion connected to the tip of the base. A sealed hollow container. 2. A blow-molded thick wall portion projecting from the bottom surface of a hollow portion surrounding the blow hole formed by vacuum suction during blow molding to the outside of the room. 2. The sealed hollow container according to claim 1, wherein the container is formed by crushing.