JPH0329757A - Container - Google Patents

Abstract

PURPOSE: To unify heating of high frequency closure by constituting a foil closure membrane of a material except metal foils in the region of its tear-off tag. CONSTITUTION: The secondary seal in a lid 3 is formed of a cardboard layer 5 and a corrosionproof layer 6 and a non-metallic foil membrane 13 forming a tear-off tag 8 exists on an opening 1 of a container below this laminated materials. An aluminum layer 11 is bonded on the underside of this membrane 13 through a sealing layer 10 and this aluminum layer 11 has its shape whose dimension fits to the shape of the circumference 2 of the opening of the container. In addition, another sealing layer 12 is applied on the underside of the aluminum layer 11 and the aluminum layer 11 bonded on the non-metallic foil membrane 13 is hermetically sealed on the edge 2 of the opening 1 of the container through this layer 12. As the foil membrane with a tear-off tag is made of a paper or a synthetic material and is a non-metal, it is possible thereby to perform uniformly heating during sealing by a high frequency process and to eliminate failure of sealing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that the opening of the container on the underside of the lid is closed with a tear-off or pull-away foil membrane, and the foil membrane is sealed to the edge of the opening by a sealing layer to prevent the opening of the container from tearing or pulling away. Relating to a container made of glass, ceramic or laminated wood having a screw-fit or push-fit lid, provided with a tear-off knob for release. Containers with such foil sealing membranes for use in foodstuffs and consumer goods such as coffee are known (e.g. European Patent No. 0148527), which preserve aromas and A sealing foil membrane is provided to seal the mouth of the container to ensure the integrity of the container contents. For sealing, the foil membrane is provided with a sealing layer of synthetic material. Sealing the foil membrane at the rim of the container mouth is performed in two different ways. One method is to seal with pressure and heat a foil membrane placed over the green of the container's mouth before closing. Another method involves applying a lid and sealing by high-frequency heating of the sealing layer, which requires providing the foil membrane with a metal layer and applying the necessary pressure with the lid. Metallic layers are typically desirable for encapsulating fragrances and are typically
It is an element of thin film. Radiofrequency sealing has the advantage that it can be carried out as part of the filling process, with the lid still in place, within a very short period of time. Known metal foil membranes have the same foil structure as the membrane itself or are formed integrally with the membrane, and tear tabs are often stamped or surface-mounted, so that non-uniformity of the sealing layer during radio frequency sealing is avoided. A problem exists with these membranes in that the metal tear tabs affect the induced eddy currents in a manner that results in excessive heating and therefore incomplete sealing. Conventionally, high-frequency sealing of containers with foil membranes has been practiced for containers whose foil membranes do not have a tear tab. However, such tear-off tabs are preferable to quickly and easily open the quality seal. As a result of the above problem, the tear tab may be at the mouth of the container or
Traditionally, foil membranes with tear tabs have been sealed in such a way that they are always placed at specific locations around the mouth. For problem-free sealing, an induction coil was required here, taking into account the metal aggregation in the region of the tear knob and the resulting deformation current flow. These procedures are expensive and cost-increasing. The present invention provides a container of the above-mentioned type with a foil membrane flanked in such a way that high-frequency sealing is possible in a simple and cost-effective manner, even with the provision of tear-off tabs. It is based on the purpose of giving. According to the invention, the above object is achieved in that the foil membrane is substantially metal-free, at least in the fJ region of its tear tab, ie it is deposited without a metal layer. Such a metal membrane does not interfere with high frequency sealing even if there is a knob. Thus, the core of the invention is that instead of the metal foil laminate as an integral tear-tab sealing membrane, the container opening is sealed with the help of a separate disc-shaped metal foil or a disc-shaped metal foil mounted on a foil membrane. The advantage comes from the use of a substantially metal-free foil as a foil membrane as a quality-preserving seal, which is sealed to the edges of the product. The term "substantially metal-free" refers to the construction of the tear tab of the foil membrane which does not create distortions of the dielectric S electric field that would impair the sealing function, in an advantageous embodiment of the container according to the invention. The foil membrane can be constructed with a metal-free tear tab. In this context, the metal layer required for high-frequency sealing can be formed by a disk-shaped metal foil placed above or below the foil membrane, the overall shape of the metal foil being adapted to the container mouth, i.e. It follows the edge of the container mouth and does not deviate significantly from it. Since only such a metal boil guarantees a uniform amount of metal f over the entire area of the rim of the container mouth,
The reason for this is to provide a uniform heating of the sealing layer of the foil membrane and therefore a uniform seal. In this connection, a disc-shaped metal foil can be placed in the container lid and fixed in several places with adhesive beforehand.

Another embodiment of the container according to the invention is possible, comprising:
The foil membrane is constructed such that only the area of the tear tab is substantially metal-free, while the remaining area, precisely shaped to the container opening, forms a laminate with metal foil. . This metal foil is not present on the tear tab and therefore does not deviate significantly from the shape of the container surroundings, so it does not affect the high frequency seal in the area of the tear tab.

The foil membrane can be made from paper or solid materials such as polyester, polycarbonate, etc., or transparent foil. As for the metal in one of the two embodiments, the metal layer can be shaped for this purpose, for example by laminating aluminum, by vapor depositing or by powder coating.

The sealing layer, which serves to seal a foil membrane or metal layer to the rim of a container mouth or to bond a metal layer to a non-metallic layer of a metal case, can be made from sealable materials, laminated, painted, or extruded. It can be applied by painting. In the container according to the invention, the foil membrane is therefore sealable or is coated with a sealable coating and has one or more tear tabs so that the foil membrane can be opened without regard to a particular orientation. A composite material that can be applied to seal the container mouth in a manner that allows quick and simple radio-frequency sealing during the filling process, without the need for special radio-frequency sealing heads for this purpose. Can be foil or transparent foil. The present invention will be explained in more detail below with reference to the accompanying drawings. In all three embodiments shown, a container is provided in which the container opening l is closed by a screw-fitting lid 3 of lumber, metal, etc., which is fitted onto the rim 2 of the container. In the embodiment of FIG.
If desired, this layer 5 can be provided with an anti-corrosion layer 6 of synthetic material.

Below these layers is a foil P47 with tear knob 8.
is arranged, this foil membrane 7 is made of a synthetic material, for example polyethylene, terephthalate or paper, over the entire area, including the tearing tab 8, on the side facing the edge of the container opening l.
A heat sealing layer 9 is provided which is mainly made of a synthetic material, for example a thermoplastic ionomer resin. With this heating sealing layer 9, the foil film 8 is sealed to the edge 2 of the container mouth 1 by high frequency heating by the aluminum layer 5. After tearing off the foil membrane 7 together with its sealing layer 9 with the help of a tear-off knob 8, a shape is formed from the cardboard layer 4, the aluminum layer 5 and the anti-corrosion layer 6, which is inserted into the container lid 3. The laminated material acts as a secondary seal for the container. In the embodiment illustrated in FIG. 2, this secondary seal present in the lid 3 is formed only from the cardboard layer 5 and the anti-corrosion II 6. Below this laminate there is a non-metallic foil 115113 extending over the container mouth 1 and in which a tear tab 8 is formed, to the underside of this membrane 13 an aluminum 7111 is glued by means of a seal 1110; The aluminum layer 11 is adapted in its shape to the shape and dimensions of the circumference 2 of the container mouth, ie it follows the lip of the mouth and does not extend beyond the lip as the tear tab 8 does. Another sealing layer 12 is applied on the underside of the aluminum layer II, which seals the aluminum layer 1l, which is bonded to the non-metallic foil membrane l3, to the edge 2 of the container opening 1.
It will be sealed. In this embodiment as well, since the foil membrane with tear tabs is made of paper or synthetic material and is non-metallic, even if the tear tabs 8 are provided, the foil membrane with the tear tabs 8 can be removed by the high frequency process.
It is possible to seal without any defects. In this example,
The tear tab 8 is attached to the top surface of the foil membrane so that it extends between the foil membrane and the cardboard 1 composite laminate inserted into the lid.

In the embodiment illustrated in FIG. 3, a secondary seal is inserted into the lid 3 in the form of a laminate consisting of a cardboard layer 4 and a composite layer 6, similar to the embodiment according to FIG. ．． The quality preservation seal of the foil membrane is formed by a non-metallic foil membrane 14 with a tear knob 15, and a sealing layer l
Sealed by 6.

An aluminum layer 18 is laminated on the surface of this foil film 4 with a sealing layer l7 interposed therebetween. This aluminum layer is shaped to the corresponding contour of the rim 2 of the container opening 1 and does not extend over the tearing knob l5. For this reason,
In this embodiment, in which the aluminium layer 18 required for the high-frequency seal does not impair the production of an accident-free seal, the tearing knob l5 is removed from the free space l9 between the edge of the container opening 1 and the edge of the container lid 3. folded inside.

[Brief explanation of drawings]

1 to 3 are vertical sectional views of the container mouth with attached lid of three different advantageous embodiments of the container according to the invention. 1... Container mouth, 2... Edge of container mouth, 3
... Container lid, 4... Cardboard layer, 5...
Disc-shaped metal foil, 6... Corrosion protection layer, 7... Foil film, 8... Tear knob, 11... Disc-shaped metal foil, 12... Sealing layer, 13. 14... Foil membrane, 15... Tear knob, 16... Sealing layer, 18... Disc-shaped metal foil, 19...
・Free space, 20...lid edge.

Claims (1)

[Claims] 1. The container opening below the lid is closed by a tear-off or tear-off foil membrane that is sealed to the edge of the container mouth by a sealing layer and is provided with a tear-off knob for tearing or pulling away. , a container having a lid, the foil membrane (
7, 13, 14) at least the tearing knob (8,
15) A container characterized in that the region of item 15) is substantially metal-free. 2. The entire foil film (7, 13, 14) together with the tearing knob (8, 15) is substantially metal-free, and the disc-shaped metal foil (5, 1) has an overall shape that matches the container opening.
1, 18) is arranged above or below the iphor membrane. 3. The disc-shaped metal foil (5) is the container lid (3)
3. A container according to claim 2, wherein the container is mounted in a container. 4. Container according to claim 3, wherein the disc-shaped metal foil (5) mounted in the container lid (3) is laminated to a layer (4) of cardboard or similar flexible material. 5. According to claim 4, the multilayer composite formed from said metal foil (5) and said layer (4) of cardboard or similar flexible material further comprises an anti-corrosion layer (6) of synthetic material. container. 6. The foil film (7, 13, 14) is paper;
consisting of synthetic material, transparent foil or similar non-metallic materials;
The container according to claim 1. 7. The foil film (13, 14) is substantially metal-free only in the region of the tearing knob (8, 15), and the remaining region is covered with a metal foil that matches the shape of the container lid (1). 2. The container according to claim 1, wherein (11, 18) are stacked. (Figures 2 and 3). 8. The foil film (13, 14) is connected to the metal layer (11,
18) A container according to claim 7, wherein the container is glued thereon. 9. The metal layer (11, 18) is connected to the foil film (13,
14) A container according to claim 7, which is vapor deposited or powder coated thereon. 10. The metal foil (11) is arranged on the side of the foil membrane (13) facing the edge (2) of the container opening (1), and the sealing layer (12) arranged on this side seals the container edge. 8. Container according to claim 7, characterized in that the sealing layer is applied on the side of the metal foil facing the edge (2). (Figure 2). 11. Said metal foil (18) is arranged on the side of said foil membrane (14) facing away from the edge (2) of said container mouth (1), said foil membrane (14) being arranged on the opposite side thereof; 8. Container according to claim 7, wherein the container is sealed to the edge (2) of the container via a sealing layer (16) that is sealed to the edge (2) of the container. (Figure 3). 12. Container according to claim 7, characterized in that the tearing tab (8) arranged on the foil membrane (13, 14) is applied to the upper side of the foil membrane. (Figure 2). 13. The tear-off knob (8) arranged on the foil membrane (13, 14) closes the free space (19) between the lid edge (20) and the edge (2) of the container opening (1). 8. The container of claim 7, wherein the container extends into a container. (Figure 3). 14. A container according to claim 7, wherein a layer (4) of cardboard or similar flexible material extending beyond the foil membrane (7, 13, 14) is arranged in the container lid (3). container.