JPH04142259A - Composite container lid - Google Patents

Abstract

PURPOSE:To permit an effective protection of the edges of a thin metal plate and combine the advantages of plastic and metallic caps by a method wherein the diameter of the thin metal plate of an inner lid is made larger than the inside diameter of a container opening part and smaller than the outside diameter thereof and the edges of the thin metal plate are covered with the liner material applied to its inner surface integrally therewith. CONSTITUTION:An inner lid 20 consists of a thin metal plate 21 such as tinplate and chromic acid treated steel plate and a liner 22 for retaining the sealability of a container lid. The diameter of the thin metal plate 21 is made larger than the inside diameter of a container opening part to be covered therewith to maintain its sealability. The liner 22 is made thin at the central part 22a of the inner lid and thick around the outer peripheral part 22b thereof so as to maintain the sealability between the liner and the mating container opening part. The outer peripheral part 22b of the liner is provided with a locking projection 23 for engaging the inner and outer lids and a covering part 24 for preventing the cut edge faces of the thin metal plate from exposure, both being formed integrally. The inner lid is supported within the outer lid 1 by a retaining projection 7 therein and the central opening part 2 of the outer lid 1 is completely closed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a composite container lid consisting of a combination of an outer lid and an inner lid.

(Prior Art) Composite container lids consisting of a combination of an outer lid and an inner lid have been known (for example, in Japanese Utility Model Publication No. 57-20523 and Japanese Unexamined Patent Publication No. 61-259960). Since the outer cover is made of synthetic resin and the inner cover is made of metal, it has both the advantages of a metal cap and the advantages of a plastic cap.

However, since the metal inner lid of this container lid is created by press molding, the inner lid edge is defined by a sharp cut edge, so when combining the inner lid and outer lid, the inner lid There is a risk that the inner surface of the skirt portion of the outer cover may be damaged by the sharp edges of the outer cover.

Further, when the inner cover is formed from a thin tin plate or a thin steel plate treated with chromic acid, there is a risk that the anti-corrosion coating will be damaged at the cut edge of the inner cover, and therefore rust will develop from the edge of the inner cover. In such a case, when the package is opened, the occurrence of rust can be easily detected, causing discomfort to the consumer.

As a method for treating the cut edge of the inner lid, it has been adopted to curl the edge of the inner lid outward to protect the edge and solve the above problem (Japanese Patent Laid-Open No. 1986-1999). 45264).

(Problem to be Solved by the Invention) However, with the inner lid made of the metal material mentioned above and having curled edges, the size of the inner lid becomes larger due to the curled portion, and therefore, the container opening needs to be stepped. In addition, when considering the ease of setting, a problem arises in that the outer diameter of the cap and the wall thickness of the bottle must be increased.

Another drawback is that the amount of material used for the inner lid increases at the curled portion, which is not economically desirable.

Therefore, an object of the present invention is to provide an economical composite container lid that combines the advantages of both plastic caps and metal caps.

Still another object of the present invention is to provide a composite container lid consisting of an outer lid body identified at the container mouth and an upper lid detachably held to the outer lid body, which has excellent sealing performance and opening performance, and is resealable. To provide a composite container lid to which an inner lid is applied which can later be used as an inner lid of the composite container lid.

(Means for Solving the Problems) According to the present invention, the present invention includes an annular top wall having an opening in the center and a cylindrical skirt portion hanging down from the periphery of the top wall, and the inner circumferential surface of the skirt portion has a holding part. A composite container lid comprising an outer lid in which a protrusion and a threaded portion that engages with the container mouth are formed in the lower part thereof, and an inner lid held by the holding protrusion inside the outer lid. , the inner lid is composed of a thin metal plate and a liner material applied to the inner surface of the thin metal plate, and the diameter of the thin metal plate is larger than the inner diameter of the container mouth and less than or equal to the outer diameter of the container mouth, There is provided a composite container lid characterized in that the edge of the thin metal plate is integrally covered with a liner material applied to the inner surface of the thin metal plate.

According to the present invention, there is also provided an outer cover comprising an outer cover main body which is fixed in position on the container mouth and is provided with an opening for discharging contents, and an upper cover which is detachably held on the outer cover main body; In a composite container lid consisting of a combination with an inner lid that is detachably held inside the lid, the inner lid is composed of a thin metal plate and a liner material applied to the inner surface of the thin metal plate. The diameter is larger than the inner diameter of the container mouth and less than the outer diameter of the container mouth, and the edge of the thin metal plate is integrally covered with a liner material applied to the inner surface of the thin metal plate. There is provided a composite container lid characterized in that the inner lid can fit into the inner surface of the upper lid top plate of the outer lid after opening.

(Function) In the present invention, the diameter of the thin metal plate of the inner lid used is larger than the inner diameter of the container mouth to which it is applied, but not more than the outer diameter of the container mouth, and the edge of the thin metal plate is used. An important feature is that it is integrally covered with a liner material applied to the inner surface of the thin plate.

Since the thin metal plate is formed by press-forming a metal plate such as tinplate, chromic acid-treated steel plate, or aluminum thin plate, its edges are sharp and the untreated portion is exposed. By integrally covering the sharp edges of this thin metal plate at the same time as forming the liner, it is possible to form an inner lid with protected metal edges without the need for special processing of the thin metal plate. be. Therefore, since this inner lid can maintain a flat shape, the outer diameter of the outer lid and the shape of the bottle mouth are not affected, and if the metal plate is larger than the inner diameter of the container mouth, the inner lid will Since the sealing performance is maintained, the amount of metal plates used can be reduced compared to conventional ones, which is also economically advantageous.

(Preferred Embodiments of the Invention) The composite container lid of the present invention will be described in detail based on specific examples shown in the accompanying drawings.

In Fig. 1-A showing the outer cover used for the composite container cover of the present invention, the outer cover, designated as 1 as a whole, has an opening 2 in the center.
It consists of an annular top wall 3 having a cylindrical top wall 3 formed thereon, and a cylindrical skirt portion 4 hanging down from the periphery of the top wall 3.

The top wall 3 and the cylindrical skirt portion 4 are integrally formed by plastic injection molding or the like.

A knurled groove 5 is formed on the outer surface of the cylindrical skirt portion 4 to facilitate gripping and turning by fingers, and a threaded portion 6 is formed on the inner surface of the skirt portion 4.
A plurality of holding protrusions 7 are formed that protrude radially inward at regular intervals. This holding protrusion may be provided in an annular shape.

This outer lid is also provided with a pilfer-proof mechanism, which is known per se, and in this embodiment, the mechanism comprises a narrow width connected by a circumferential perforation-like weakened line 8 at the lower end of the skirt portion. It consists of an annular piece lO, and this annular piece 1
On the inner surface of the container 0, a number of protrusions 11 to be engaged with the jaws of the container are provided at a constant inclination angle inward.

Further, in Fig. 1-B showing the inner cover used in the composite container cover of the present invention, the inner cover, which is indicated as 20 as a whole, includes a thin metal plate 21 such as tin plate or chromic acid-treated steel plate, and a sealing property of the container cover. It is formed from a liner 22 for holding. If the diameter of the thin metal plate 21 is larger than the inner diameter of the mouth of the container to which it is applied, its sealing performance can be maintained. Also liner 2
2, the inner lid central portion 22a is provided thinly, and the outer peripheral portion 2
2b is provided thickly so as to maintain a tight seal with the mouth (not shown) of the container to which it is applied. This outer peripheral portion 22
The liner b is integrally provided with an engaging protrusion 23 for engaging the inner lid and the outer lid, and a covering portion 24 for preventing the cut edge of the thin metal plate from being exposed.

The top surface of the inner lid shown in Figure 1-B has a linear shape, but when filling the contents in a heated state, the inner lid shown in Figure 1-C
If the curved shape shown in the figure is adopted, the center of the top wall of the top cover will have a concave shape that is concave downward due to the reduced pressure before opening, but will become a convex shape that bulges upward when the package is opened. Because it deforms, it is possible to visually recognize that the container lid is well sealed, and it is also possible to hear the sound of the metal inner lid due to the sudden change in internal pressure when opening the container.
It becomes possible to auditorily recognize that the container lid is well sealed.

FIG. 2 shows a composite container lid of the present invention, which is a combination of the above-mentioned outer lid 1 and inner lid 20. In this composite container lid, the inner lid is supported by the holding protrusion 7 in the outer lid within the outer construction, and the central opening 2 of the outer lid l is completely closed, thereby forming the container. In addition to maintaining the sealing performance of the container, as mentioned above, it is also possible to recognize that the container lid has been well sealed by the shape change and sound of the metal inner lid due to the change in internal pressure when the container is opened. .

The composite container lid of the present invention is not limited to combination with the above-mentioned type of outer lid, but can also be combined with plastic outer lids of other shapes. For example, as shown in FIG. 3-A, there is an outer lid main body 31 that is fixed to the container mouth and has an opening for discharging contents, and an outer lid main body 31 that is connected to the outer lid main body 31 by a hinge or the like and is held pivotably. The container lid 30 consists of a top lid 32 and a top lid 32.
The inner lid described above can also be used. Before opening, the inner lid 33 is used as the above-mentioned composite container lid as the inner lid of the outer lid main body, and is sealed with the container opening 34 via the liner material to maintain its sealing performance. The composite container lid, in which the inner lid is held on the inner surface of the outer lid main body 31, is fitted into the container opening, and the pouring opening of the outer lid main body 31 is sealed by the inner lid 33.
Further, the top surface (pour opening) sealed by the inner lid is covered by the upper lid 32.

To open the container lid, first remove the outer lid main body 31 from the container mouth 34, and then remove the inner lid 3 fitted to the inner surface of the outer lid main body.
The inner lid is removed from the outer lid main body 31 by pushing from the top surface (pour opening) of 3. The inner cover 33 that has been removed from the outer cover main body 31 can be fitted onto the top inner surface side 35 of the upper cover 32, and can be opened by fitting the engagement protrusion 23 to the holding protrusion 7 inside the upper cover. It becomes possible to maintain sealing performance even after plugging (Fig. 3-B). By fitting the container lid 30 into the container opening 34 again, the contents can be poured out.

As mentioned above, since the inner lid is made of a thin metal plate and a liner material, it is easier to open than when a conventional aluminum foil laminate is glued to the container mouth. By fitting the inner cover 33 to the inner top surface 35 of the upper cover 32, it is possible to maintain the sealing performance even after the bottle is opened, and even in this case, the above-mentioned combination of the outer cover and the inner cover does not separate. It is possible to obtain the same effect as a container lid.

(Effects of the Invention) According to the present invention, in a composite container lid consisting of a combination of a plastic outer lid and a metal inner lid, the thin metal plate of the inner lid has a diameter larger than the inner diameter of the container mouth. The outer diameter of the thin metal plate is less than or equal to the outer diameter of the container mouth, and the edge of the thin metal plate is integrally covered with a liner material applied to the inner surface of the thin metal plate, thereby effectively protecting the edge of the thin metal plate. It combines the advantages of both plastic caps and metal caps,
It has become possible to provide a composite container lid with excellent economic efficiency.

Further, the outer lid of the composite container lid of the present invention is composed of an outer lid main body having the outer lid fixed to the container mouth and having an opening for discharging contents, and an upper lid detachably held on the outer lid main body. By making the inner lid fit into both the outer lid body and the top lid, it is possible to provide a composite container lid that has excellent sealing performance and opening performance, and also has excellent gas permeability even after resealing. became.

[Brief explanation of the drawing]

Figure 1-A is a side sectional view showing an example of the outer lid used in the composite container lid of the present invention, and Figures 1-B and 1-0 are the inner lids used in the composite container lid of the present invention. FIG. 2 is a side sectional view showing an example of the composite container lid of the present invention, and FIG. 3-A is a side sectional view of an example of the composite container lid of the present invention before opening. Fig. 3-B is a side sectional view showing the state of an example of the composite container lid of the present invention after opening. DESCRIPTION OF SYMBOLS 1-- Outer lid, 3... Top wall, 4... Cylindrical skirt portion, 20-- Inner lid, 22... Liner, 31-...
・Cap body, 32...Top lid, 33...Inner lid.

Claims (2)

[Claims] (1) It includes an annular top surface having an opening in the center and a cylindrical skirt portion hanging down from the periphery of the top wall, and the inner peripheral surface of the skirt portion has a holding protrusion and the lower portion thereof engages with the container mouth. A composite container lid comprising an outer lid formed with a mating screw portion and an inner lid held by the holding protrusion on the inside of the outer lid, wherein the inner lid includes a thin metal plate and a thin metal plate. The diameter of the thin metal plate is larger than the inner diameter of the container mouth and smaller than the outer diameter of the container mouth, and the edge of the thin metal plate is on the inner surface of the thin metal plate. A composite container lid characterized by being integrally covered with a liner material applied to the side. (2) An outer lid consisting of an outer lid main body that is fixed in position on the container mouth and has an opening for discharging contents, and an upper lid that is removably held on the outer lid main body, and on the inside of the outer lid. In a composite container lid that is combined with an inner lid that is detachably held, the inner lid is composed of a thin metal plate and a liner material applied to the inner surface of the thin metal plate, and the diameter of the thin metal plate is the same as the container opening. The inner diameter of the inner lid is larger than the outer diameter of the container opening, and the edge of the thin metal plate is integrally covered with a liner material applied to the inner surface of the thin metal plate, and the inner lid is A composite container lid, characterized in that it can be fitted to the inner surface of the top plate of the outer lid after opening.