JPH0427811Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Purpose of the invention [Field of industrial application] This invention relates to an easily peelable and openable lid, particularly to lids for cup-shaped or tray-shaped molded containers for storing food and other items. It is.

[Prior Art] Molded containers in the form of pots or trays, which are made at least partially of plastic materials and are used to store food and other goods, are lightweight, easy to handle, and inexpensive, and can store contents on a par with cans and bottles. It is widely used because of its characteristics.

An important condition for ease of handling of such containers is ease of opening, which means that the contents can be easily opened with just your fingers without the need for other tools or great force. Various types of lids have been considered.

[Problems to be solved by the invention] As this type of easy-to-open lid, there are two types of easy-to-open lids: tear-open lids that are opened by tearing the lid, and peel-open lids that are opened by peeling the lid. However, tear-openable lids tend to increase costs due to the increase in materials and processes, and also require a certain amount of force to open, which may cause the contents to spill out. In addition, in the case of peel-openable lids, it is difficult to achieve both easy peelability and complete sealing of the filling seal, and in order to maintain easy peelability, complete heat is required. There was a problem that a seal could not be formed and it became somewhat unstable in terms of complete sealing.

This idea was made in view of the above circumstances, and it is possible to completely heat-seal the filling seal part and seal it completely, and the opening operation can be performed only with fingers and requires almost no force. The purpose of the present invention is to provide an easy-to-peel and open lid which has a simple structure, has a well-shaped opening, has a well-shaped opening, has no fear of contents flying out due to the force of opening, and has a simple structure and is inexpensive.

(b) Structure of the invention [Means for solving the problem] In response to this purpose, the easily peelable and openable lid of this invention is a lid that is sealed in a seal area at the peripheral edge of the opening end of the container to close the opening. The lid has an outer layer material having an outer edge contour that can cover the opening end of the container, and an inner layer material that is bonded to the outer layer material in a band shape substantially along the sealing area, and the inner layer material is bonded to the outer layer material. The material is composed of a laminate material consisting of multiple layers, and the lamination strength between the innermost layer adhered to the sealing area of the container and its adjacent layer is smaller than the adhesive strength between the sealing area and the innermost layer. , and the inner edge of the inner layer material is located inside the inner edge of the seal area.

The details of this invention will be explained below with reference to the drawings showing one embodiment.

In FIGS. 1 and 2, reference numeral 1 indicates an easily peelable lid. The easily peelable lid 1 is sealed to the flange portion 3, which is the peripheral edge of the opening end of the molded container 2, in the annular sealing area 8 by means such as heat sealing, thereby sealing the opening 4 of the molded container 2. be.

The easily peelable and openable lid 1 is provided by laminating and bonding an outer layer material 5 and an inner layer material 6, particularly as shown in FIGS. 2, 3, and 4.

The outer layer material 5 has an outer edge contour that is approximately the same as the outer edge contour of the flange portion 3 of the molded container 2 and may cover the opening 4 of the container 2 . The outer layer material 5 is composed of a flexible single layer or laminated film. In the illustrated case, as an example, it is composed of a laminated film consisting of three layers: a surface layer 11, an intermediate layer 12, and a back layer 13. Inner layer material 6
is a band-shaped body having a width W having an inner edge 15 and an outer edge 16, and is bonded to the back surface of the outer layer material 5 so as to be located substantially along the sealing area 8. In the illustrated case, the inner layer material 6 is a ring-shaped body in which band-shaped bodies each having a width W are connected in an endless manner. The outer edge 16 of the inner layer material 6 almost coincides with the outer edge 23 of the sealing area 8, and both the outer edge 16 of the inner layer material 6 and the outer edge 23 of the sealing area 8 are inner than the outer edge 25 of the flange portion 3 ( It is located near the center axis of the molded container 2. Inner layer material 6 includes front material 17 and backing material 1
What is particularly important is that the adhesive strength between the front material 17 and the back side 18 is selected to a predetermined value so that they can be peeled off. The adhesive strength between the outer layer material 5 and the backing material 18 is determined to be smaller than the adhesive strength between each layer 11, 12, and 13 in the outer layer material 5 and the adhesive strength between the outer layer material 5 and the inner layer material 6. Furthermore, the adhesive strength between the front material 17 and the backing material 18 is determined to be smaller than the adhesive strength of heat sealing between the backing material 18 and the flange portion 3, which will be described later. The outer edge 16 of the inner layer material 6 is located inside the outer edge contour 21 of the outer layer material 5 (closer to the central axis of the molded container 2), and the inner edge 15 is located within the sealing area 8.
It is located inside the inner edge 22 of.

A backing material 18 of the inner layer material 6 is adhered to the flange portion 3 of the molded container 2 in the sealing area 8 by heat sealing.

The inner layer material 6 is heat sealed with the outer layer material 5,
In addition, the flange portion 3 is made of a laminated material that can be completely heat-sealed. Examples of the constituent materials of the outer layer material 5 and the inner layer material 6 include the following.

Outer layer material is a flexible laminated film ◎ Outer layer material surface layer 11: Outer base material is polyester film, biaxially stretched 6-nylon film 2
Axially oriented polypropylene film, paper, etc., thickness 10μ to 50μ ◎ Intermediate layer 12 of outer layer material: Aluminum foil, PVDC, aromatic nylon film, thickness 5μ to 30μ as barrier material ◎ Back layer 13 of outer layer material: Polyethylene film (high , medium, low density), linear polyethylene film, EVA film, etc., thickness 20μ~
100μ ◎ A biaxially stretched 6 or 6-6 nylon film may be inserted as a reinforcing material between the surface layer 11 and the intermediate layer 12 of the outer layer material.

◎ The surface layer 11, intermediate layer 12, and back layer 13 of the outer layer materials are laminated together using a two-component urethane-based adhesive.

The inner layer material 6 is a film in which polyethylene and polypropylene resin are laminated together by coextrusion, a laminated film in which a polyethylene film is extrusion coated with a polypropylene resin, or a laminated film in which a polypropylene film is extrusion coated with a polyethylene resin. At that time, the lamination strength between both resin layers is 100g to 1500g/15mm width, and the optimum lamination strength is 300g to 500g/15mm width.

◎ Surface material 17 of inner layer material 6: Same material as back layer 13 of outer layer material 5, thickness 20μ to 100μ, optimally 40μ ◎ Backing material 18 of inner layer material 6: Polypropylene film (homo, random, block, polyethylene blend, tough) Polymer blend, polybutene-1 blend, etc.), thickness is 20μ to 100μ
Optimum value is 40μ ◎ Innermost surface of molded container 2 (top surface of flange portion 3): same resin material as backing material 18 of inner layer material 6 In the case shown in Fig. 4, easy-open lid 1, outer layer material 5,
Although the inner layer material 6 is circular, it goes without saying that they may be square as shown in FIG.

[Operation/Effect] The easily peelable lid 1 configured as described above is completely heated to the flange portion 3 in the seal area 8 between the heat seal bar 26 and its receiving portion 27, as shown in FIG. Once sealed, the molded container 2 is completely hermetically sealed.

When removing the contents, as shown in Figure 6,
When the easily peelable opening lid 1 is picked up and pulled up, the surface material 1 of the inner layer material 16 is bonded with the smallest adhesive strength.
7 and the backing material 8 are sequentially peeled off from the outer edge 16 and are easily peeled off without requiring much force, and as the peeling progresses, the opening progresses.

Next, considering the sealability against internal pressure, when internal pressure acts on the easily peelable lid 1, a force F that causes peeling acts on the easily peelable lid 1 as shown in FIG. Inner edge 15 of inner layer material 6
is located inside the inner edge 22 of the sealing area 8 by a distance S (see Fig. 3), so as the outer layer material 5 rises due to the action of the force F, the inner layer material 6 also rises within the range of the distance S. The resulting force F mainly acts on the boundary between the inner layer material 6 and the flange portion 3 of the molded container 2, that is, the inner edge of the sealing area 8. width), so it will not peel off. This ensures sufficient sealing performance.

In this way, with this invention, it is possible to obtain an easily peelable and openable lid that can achieve both easy peelability and complete sealability.

[Brief explanation of drawings]

FIG. 1 is a plan view of an easily peelable lid according to an embodiment of the invention, FIG. 2 is a cross-sectional view showing the easily peelable lid shown in FIG. 1 sealed to a container, and FIG. The figure is an enlarged explanatory view of the seal between the easily peelable lid and the container, Figure 4 is an exploded explanatory view of the easy peelable lid, Figure 5 is an exploded explanatory view of another easily peelable lid, and Figure 6 is an exploded explanatory view of the easy peelable lid. The figure is an explanatory cross-sectional view showing the opening state of a container sealed with the easily peelable lid shown in Figure 1, and FIG. 7 is an explanatory cross-sectional view showing the deformed state of the easily peelable lid when internal pressure is applied. be. 1...Easily peelable lid, 2...Molded container, 3...
...Flange part, 4...Opening part, 5...Outer layer material, 6
...Inner layer material, 8...Seal area, 11...Surface layer, 1
2... middle layer, 13... back layer, 15... inner edge,
16... Outer edge, 17... Front material, 18... Back material,
21...Outer edge contour, 22...Inner edge, 23...Outer edge, 25...Outer edge, W...Width, S...Distance,
F...Power.

Claims (1)

[Claims for Utility Model Registration] (1) A lid that closes the opening by being sealed in a sealing area at the peripheral edge of the opening end of the container, the lid including an outer layer material having an outer edge contour capable of covering the opening end of the container. and an inner layer material laminated to the outer layer material in a band shape substantially along the sealing area,
The inner layer material is composed of a laminate material consisting of multiple layers, and the lamination strength between the innermost layer adhered to the sealing area of the container and its adjacent layer is smaller than the adhesive strength between the sealing area and the innermost layer. 1. An easily peelable and openable lid, characterized in that the inner edge of the inner layer material is located inside the inner edge of the sealing area. (2) The easily peelable and openable lid according to claim 1, wherein the outer edge of the inner layer material is located inside the outer edge contour of the outer layer material.