JPH0847986A - Production of lid device for wide-mounted container - Google Patents

Abstract

PURPOSE:To enhance gas barrier properties at the place of a closure element in a lid device constituted so that an opening hole is provided to a lid element made of a metal plate to be closed by the closure element made of a synthetic resin and the closure element is torn by pulling a pull ring to open the opening hole. CONSTITUTION:A lid element 2 is held between first and second molds 7, 10 and a film 3 is arranged between the lid element 2 and the second mold 10 and, in this state, a molten synthetic resin 12 is injected into the cavity 6 for molding a closure element of the first mold 7 under pressure. The film 3 is broken through by the pressure of the molten synthetic resin and the molten synthetic resin 12 flows in a cavity 9 for molding a pull ring to be molded and the film 3 becomes the state bonded to the entire outer surface of the closure element.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin material provided with an opening hole in a cover made of a metal plate with respect to a mouth for a wide-mouthed container, and provided with an opening holding tab (tab) in the cover. The present invention relates to a method of manufacturing a pull-open type lid device, wherein a closing body is integrally formed so as to close the opening hole, and the opening is opened by pulling the holding piece to tear the closing body. It is.

[0002]

2. Description of the Related Art Conventionally, a pull-open type lid for a wide-mouth container is formed of a single metal plate, and a thin weakening line is formed on the lid in a closed loop shape. A cut portion is formed by providing the cut portion, and a pull ring formed by separately bending a ring-shaped metal plate is caulked to a portion of the outer surface of the cut portion adjacent to the weakening line, and the pull ring is pulled to cut the cut portion. It is designed to be opened by separating the parts.

However, in such a lid formed entirely of a metal plate, after the cutout is cut off, the outer peripheral edge of the cutout and the opening of the opening formed by cutting the cutout are cut off. Because the inner periphery becomes sharp and angular,
Accidents such as injuries caused by the body touching the cut off part, or injuries of fingers at the inner periphery of the opening when putting fingers into and out of the opening of the lid, etc. Not only is there a problem in terms of safety, but it also requires a high degree of technology to bend the ring-shaped metal plate into a smooth state so that people do not hurt the finger, which increases the manufacturing cost. There was also a problem.

Regarding this point, US Pat. No. 4,746,659 as a prior art discloses that a cover made of a metal plate is provided with an opening hole and a cover made of a synthetic resin with a gripping piece is provided on the cover. There is disclosed a lid device that is integrally formed so as to close the opening hole, pulls the holding piece, and tears the closure along the edge of the opening hole to open the lid.

[0005]

According to this prior art, since the seal is opened at the closed portion made of synthetic resin, it is possible to prevent injuries from the closed portion cut off from the container and to prevent the inner peripheral edge of the opening hole from being injured. Can reduce finger injuries. However, since the synthetic resin has a small amount of moisture permeability, in the configuration in which the opening hole is simply closed by the closing body as in the above-mentioned prior art, if the container is stored for a long time in a sealed state, The infiltrated water may cause a problem that the contents are altered or the odor of the contents leaks to the outside.

An object of the present invention is to solve this problem with an extremely simple configuration.

[0007]

In order to achieve this object, the present invention provides an opening in a cover made of a metal plate which is fitted to the mouth of a wide-mouthed container, and the cover has a holding portion for opening. As a method of manufacturing a lid device formed by integrally molding a closing member made of a synthetic resin provided with a piece so as to close the opening, `` the lid is provided with a cavity for molding the closing member. Between the first mold and the second mold having a cavity for molding the holding piece, the outer surface of the lid faces the second mold and the inner surface faces the second mold. A film such as a moisture-impermeable film that closes the opening hole is disposed between the lid and the second mold, and in this state, the film is formed in the cavity for forming the closed body. Inject molten synthetic resin. "

[0008]

In this configuration, in the state where the lid is sandwiched between the two dies, the molten synthetic resin injected into the cavity for forming the closing body in the first mold is used to remove the film from the second mold. While filling the cavity for forming the closed body. In this case, in a state where the lid is sandwiched between the first mold and the second mold, the film-forming cavity in the first mold and the cavity for forming the holding piece in the second mold are formed of a film. However, since the molten synthetic resin is injected into the cavity for molding the lid with high pressure, the holding piece is held in a state where the film is pressed against the second mold with a strong force. A strong pressure is applied to the molding cavity, so that the film is pierced by the molten synthetic resin at the entrance of the gripping piece molding cavity, and the molten synthetic resin enters the gripping piece molding cavity. As a result, the gripping piece is integrally formed on the outer surface of the closing body.

Further, since the film is strongly pressed against the second mold by the molten synthetic resin, the film is fused to the closing member due to the adhesiveness of the molten synthetic resin.
Therefore, the film can be firmly attached to the entire outer surface of the closing body without using an adhesive or the like. As described above, according to the present invention, the film can be adhered to the entire outer surface of the closure at the same time as the closure is integrally molded with the lid, so that the lid device for a wide-mouthed container maintaining the safety after opening is achieved. This has an effect that extremely improving the gas barrier property can be achieved extremely easily. In addition, since various types of printing can be performed on the film to make the lid device colorful, there is an effect that the decorativeness can be improved and the commercial value can be increased.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 7 show a first embodiment. In these figures, reference numeral A denotes a wide-mouthed container formed of an appropriate material such as metal or synthetic resin, and reference numeral 1 denotes a lid device for closing the wide-mouthed container A. First, the structure of the lid device 1 will be described.

The lid device 1 has a lid 1 made of a metal plate, and a lower U-shaped engaging portion 2a to be fitted to the mouth of the wide mouth container 1 is formed on the outer peripheral edge of the lid 2. ing. The cover 2 is provided with a large-diameter opening 2b substantially concentric with the cover 2, and the periphery of the opening 2b is folded inward. As shown in FIGS. 6 and 7, the lid 2 includes
A closing body 5 made of synthetic resin for closing the opening 2b is integrally formed. An annular thin portion 13 extending along the inner peripheral edge of the opening hole 2b is formed on the inner surface of the closing body 5, while the outer surface of the closing body 5 is covered with a moisture impermeable material. Film 3 is attached. Further, a pull ring 8 as an example of a holding piece is protruded from a portion of the outer surface of the closing body 5 close to the thin portion 13 in a state where the pull ring 8 pierces the film 3.

In this embodiment, as shown in FIG. 5, the film 3 is made of an aluminum foil 3a having a thickness capable of completely blocking the ventilation.
Coat the synthetic resin layer 3b such as polyethylene on both sides of the
Although it is formed in three layers by sticking, sticking or laminating, it may be constituted by one aluminum foil or only by synthetic resin. next,
An example of a method of manufacturing the lid device 1 will be described with reference to FIGS.

As shown in FIG. 2, the lid device 1 includes a closing member 5
Both molds are formed using a first mold 7 having a closed body molding cavity 6 for molding the same and a second mold 10 having a pull ring molding cavity 9 for molding a pull ring 8. 7 and 8, the film 3 is disposed between the outer surface of the cover 2 and the second mold 10, and in this state, the center of the first mold 7 is placed. It is manufactured by injecting a molten synthetic resin 12 such as polyethylene at a high pressure from a sprue 11 drilled into a closed body molding cavity 6.

In this case, in the embodiment, on the outer surface of the lid body 2,
The film 3 is attached in advance with the adhesive 4 so as to close the opening hole 2a, so that the film 3 is arranged between the lid body 2 and the second mold 10. There is. When the molten synthetic resin 12 is injected from the sprue 11, the molten synthetic resin 12 fills the closed body molding cavity 6 while pressing the film 3 against the second mold 10,
The closing body 5 is molded.

A film 3 is provided between the two dies 7, 10.
However, since the pressure of the molten synthetic resin 12 is high, when the molten synthetic resin 12 fills the closed body molding cavity 6, the film 3 is melted by the molten synthetic resin 12 to the second position.
Since a strong pressure acts on the pull ring molding cavity 9 in a state where the film 3 is pressed against the mold 10, the film 3
Is pierced by the pressure of the molten synthetic resin 12 at the entrance of the pull ring molding cavity 9, and the molten synthetic resin 12 fills the pull ring molding cavity 9 through the hole. Will be integrally molded.

At the same time, the film 3 is a molten synthetic resin 1
The film 3 is strongly pressed against the lower surface of the second mold 10 by the pressure of 2, and in that state the synthetic resin is solidified to form the closing body 5, so that the film 3 is formed without using an adhesive or the like.
Firmly attached to the entire outer surface of the. When the film 3 is attached to the lid 2 in advance, the film 3 is peeled off from the lid 2 by the pressure of the molten synthetic resin 12 and the second
Since the film 3 is pressed against the lower surface of the mold 10, the entire film 3 is stuck to the outer surface of the closing body 5.

On the upper surface of the first mold 7, a projection 14 for forming a thin portion 13 for tearing off the closing body 5 is formed in an annular shape, and a pull ring molding in the second mold 10 is performed. The cavity 9 is formed by inserting a core 16 slidably up and down into a hole 15 formed in the second mold 10, and is formed by sliding the core 16 upward. The pull ring 8 can be die-cut.

The lid 2 manufactured in this way is shown in FIGS.
As shown in FIG. 7, the engaging portion 2 a of the outer peripheral edge is used by caulking and fixing to the mouth portion of the wide-mouthed container 1, or used, for example. 3 blocks the inside and outside of the wide-mouthed container 1 from permeating, so that even if the closing body 5 is made of a low-density polyethylene material such as low-density polyethylene, a high gas barrier property is maintained. It can be maintained over time.

Then, in order to open the sealed container 1,
The pull ring 8 is pulled upward to cut the closure 5 along the weakening line 13, and at the same time, the edge 3a of the film 3 is cut.
Is peeled off from the peripheral portion 5a of the closing body 5 so that the closing body 5
The part surrounded by the weakening line 13 may be cut and cut. In this case, since the closing body 5 is made of synthetic resin, there is no injury to the outer peripheral edge of the removed closing body 5 or finger injury to the inner peripheral edge of the hole formed after opening, and the closing Safety is secured.

A sprue 11 is provided at the center of the first mold 7.
Is formed, the molten synthetic resin 12 moves from the center to the end of the closed body molding cavity 6 during molding using the upper and lower molds 7 and 10. When the film 12 breaks through the film 3, as shown in FIG.

Then, the film 3 is torn first at a portion of the entrance portion of the pull ring molding cavity 9 near the center of the lid 2, and the film piece 3b having the same area as the cross-sectional area of the entrance portion of the pull ring molding cavity 9. Is located at a portion of the inner peripheral surface of the pull ring molding cavity 8 that is closer to the outer side of the lid body 2. Therefore, after die-cutting, the entire film piece 3b is the lid body of the outer peripheral surface of the root of the pull ring 12. It will be attached to the outer side portion of 2.

Then, the adhesion area between the peripheral edge 3a of the film 3 and the pull ring 8 increases, so that when the pull ring 8 is pulled, the edge 3a of the film 3 is prevented from being broken at the base of the pull ring 8. Therefore, at the time of opening, it is possible to prevent a problem that only the vicinity of the pull ring 8 of the edge 3a of the film 3 is peeled off while being adhered to the edge 5a of the closing body 5. .

Although the above embodiment is applied to a method of manufacturing a lid device of a type in which an obstruction body is torn and cut along a thin portion 13, the present invention is, as shown in FIGS. The closing body 5 with the pull ring 8 is configured as a removable inner plug, and the present invention can be applied to a method of manufacturing the lid device 1 in which the film 3 is attached to the outer surface of the closing body 5. That is, as shown in FIG. 10, it is sandwiched between a first mold 7 having a cavity 6 for forming a closed body and a second mold 10 having a cavity 9 for forming a pull ring, and then a cavity for forming a closed body. 6 is manufactured by injecting a molten synthetic resin from the sprue-11 of the first mold 7 toward 6. Also in this embodiment, the film 3 is attached to the lid body 2 in advance.

The lid device 1 shown in FIGS. 8 to 9 is opened by cutting at the thinned weakening line 13 formed at the lower end thereof.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a film is attached to a lid.

FIG. 2 is a cross-sectional view in a state where a lid is sandwiched by a mold.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view showing a flow of a molten synthetic resin.

FIG. 5 is an enlarged sectional view of the film.

FIG. 6 is a perspective view showing a state where the lid is fitted to the container.

FIG. 7 is a sectional view showing an opened state.

FIG. 8 is a plan view of a lid body in which the closing body is configured as an inner plug.

9 is an enlarged sectional view taken along line IX-IX of FIG.

10 is a diagram showing a second embodiment which is a method of manufacturing the lid body in FIGS. 8 and 9. FIG.

[Explanation of symbols]

 1 Wide Mouth Container 2 Lid 2b Hole 3 Non-moisture Permeable Film 5 Closing Body 6 Closing Body Molding Cavity 7 First Mold 8 Pull Ring 9 as an Example of Holding Piece 10 Pull Ring Molding Cavity 10 Second Mold 12 Melt Synthetic Resin

Claims (1)

[Claims] An opening is provided in a cover made of a metal plate which fits into the mouth of a wide-mouthed container, and a cover made of synthetic resin provided with a holding piece for opening is provided on the cover. A method of manufacturing a lid device integrally formed so as to close a hole, wherein the lid is formed by forming a first mold having a cavity for forming the closure, and the holding piece. The outer surface of the lid is located between the second mold having a cavity for
A non-moisture permeable film is provided between the lid and the second mold so as to close the opening, while sandwiching the mold so that the inner surface faces the second mold. And in that state, injecting a molten synthetic resin into the cavity for forming the closed body.