JPH0751493Y2 - Easy-open container lid - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container lid, and more particularly to an easily openable container lid which is sealed by a means such as a heat seal in a molded container for containing foods and the like.

[0002]

2. Description of the Related Art In recent years, cup containers and tray containers using a plastic material as at least a part thereof have been used as containers for hermetically storing foods and other articles. Such a container is lightweight and has the same shelf life as a can or bottle.
It is widely used because it meets the demand for resource saving at low cost and is easy to handle. Easy opening is one of the most important requirements for easy handling. There is a great demand for an easily-openable container lid that can be easily opened with only fingers without using other tools for such a container.

As a general technique for realizing the easy-opening property of such an easily-openable container lid, it is considered that the sealing strength of the lid with respect to the container is lowered to such an extent that it can be opened only by fingers. On the other hand, for a container that is filled with the contents and sealed, it is necessary to retort the container, but during this retort process, since the inside of the container is heated and the internal pressure rises, the sealing strength between the container and the lid is It must be able to withstand the rise in internal pressure during retort processing. The pressure resistance strength (seal strength) against peeling of the seal portion between the container and the lid due to this increase in internal pressure is set to 2.3 kg or more in a width of 15 mm, which is considerably high. Therefore,
It is considerably difficult to achieve both easy-open property and seal strength.

An example of a container lid that achieves both the seal strength and the easy-opening property is disclosed in JP-A-63-294368. This Japanese Patent Laid-Open No. 63-294368
As shown in FIG. 6, the technique described in the above publication comprises a lid 101 to be sealed on a container 100, which is composed of an outer surface material 102 and an inner surface material 103, and the outer surface material 102 and the inner surface material 103 are high-sealed. Inner surface material 1 sealed with a tight seal 104 with strength
03 and the container 100 are sealed by the easily openable seal portion 105 having a low seal strength, and the easily openable seal portion 105 is provided.
The inner peripheral side edge 106 is located closer to the center 112 of the container opening 111 than the inner peripheral side edge 107 of the tight seal portion 104. With this configuration, in consideration of the deformation of the lid 101, the internal pressure during the retort is mainly the tight seal portion 104 rather than the easily openable seal portion 105.
However, due to the high seal strength of the tight seal portion 104, peeling of the lid 101 is prevented, and the prescribed seal strength can be satisfied. On the other hand, the lid 101 of the container 100
When opening the lid, the outer peripheral edge of the lid 101 is picked up with fingers, and the easy-open seal portion 105 having a low seal strength is obtained.
Is peeled off and the container 100 is opened. This container lid is
It is possible to achieve both strength and easy opening property, and has a remarkable technical effect as an easily openable container lid.

[0005]

In the above technique, however, the easy-open seal portion 105 is formed by the internal pressure during retort.
In order to avoid peeling, the inner edge 106 of the easy-open seal portion 105 is positioned closer to the center of the container opening end 111 than the inner edge 107 of the tight seal portion 104. Strict dimensional accuracy control is required to
A high-precision mechanism is required for the operation and positioning of the louver,
There is a problem that the production of the container lid becomes complicated, and measures against this point are desired.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an easy-open container lid which can achieve both easy-open property and seal strength and is easy to manufacture. Has an aim.

[0007]

Corresponding to the SUMMARY OF THE INVENTION This object, easy-open container lid of this invention is heating the opening edge of the container in the sealing region of the peripheral portion provided by laminating the outer members and the inner surface material
Are collected by sealing a container lid for closing the open end of said container, said outer members has a contour that can cover the entire surface of the open end of said container, said outer members are the inner surface thereof an inner surface The inner surface material is made of a material that does not have a heat-sealing property with respect to the outer surface of the material, and the inner surface material forms an annular body that extends over the seal area, and the inner peripheral edge is located closer to the center of the opening end than the inner peripheral edge of the seal area. using an adhesive to the inner surface of the outer members in a state a sealable by peelable seal portion in the seal region at the open end of the Rutotomoni the container is tight sealed by the tight seal portion, the easy-open to The inner peripheral edge of the seal portion is more predetermined than the inner peripheral edge of the tight seal portion.
It is characterized in that a distance of the center toward the open end.

[0008]

[Function] The internal pressure during retort causes the lid to bulge outward,
It acts in the direction of peeling between the inner surface material and the outer surface material and between the inner surface material and the container. Since the inner peripheral edge of the easy-open seal portion is located closer to the center side than the inner peripheral edge of the tight seal portion, the starting end of the bulging deformation of the lid is the inner peripheral edge of the tight seal portion. However, this peeling progresses and reaches the inner peripheral edge of the tight seal portion, but the peel strength of the tight seal portion is large, so the peeling does not proceed any further and satisfies the prescribed peel strength during retort. .

On the other hand, when opening the lid of the container, if the outer peripheral edge of the lid is picked up with fingers, the easy-open seal portion having low sealing strength is peeled off and the container is opened. In this way, the securement of the seal strength and the easy opening property are compatible. retort
The easy-to-open seal part peels off due to internal pressure
In order to avoid this, the inner edge of the easy-to-open seal part should be
Closer to the center of the container opening end than the inner edge of the seal
Strict dimensional accuracy control is required for positioning,
The tight seal part is not printed or coated with adhesive.
Strict dimensional accuracy because it can be done using technology
Is easy to manage.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings showing an embodiment. 1 and 2, reference numeral 1 denotes a container lid, which is a sheet having a width W on the upper surface of the flange 10 of the container 100.
It is attached to the container area 9 to seal the open end of the container 100. The container lid 1 is provided with an outer surface material 3 and an inner surface material 4 that are adhered and laminated.

The outer surface member 3 has a substantially circular contour capable of covering the opening of the container 100 and the entire surface of the flange 10.
The performance of the container closure such as the outer surface material 3 protects the contents against external forces satisfy the, a structure having such a strength, for example, as shown in FIG. 3, PET toward the inner surface from the outer surface It has a laminated structure in which a layer of, a layer of Al, a layer of PP, a layer of PET and the like are laminated. It is particularly important that the innermost surface of the outer surface material 3 has a non-heat-sealing property such that good heat sealing cannot be performed with the outer surface of the inner surface material 4. In order to provide this non-heat sealability, in the outer surface material 3 shown in FIG.
It is composed of T layers.

The inner surface member 4 forms an annular body that extends over the seal area 9, and its inner peripheral edge 11 is located closer to the center 13 of the container than the inner peripheral edge 12 of the seal area 9. The inner surface material 4 constitutes a tight seal portion 14 using the adhesive 5 on the outer surface material 3 on the outer surface in the seal area 9, and the container 10 on the inner surface.
An easily openable seal portion 15 formed by heat sealing on the flange 10 of No. 0 provides an easily openable seal. Here, the tight seal part has a seal strength that does not peel off due to the internal pressure during retort, and the easy-open seal has a peel strength smaller than that of the tight seal part, and has a seal strength that peels by the force applied by normal fingers. It is a seal. However, the adhesive 5 is not provided over the entire area of the seal area 9, and the adhesive 5 does not exist in the portion 9a having the width X near the inner peripheral edge of the seal area 9, and therefore, in the seal area 9. , A tight seal portion 1 between the outer surface material 3 and the inner surface material 4
4 is the outer peripheral edge 17 of the seal area 9 to the inner peripheral edge 16 of the adhesive 5.
Up to (Point A). Therefore, the inner peripheral edge 16 of the tight seal portion 14 is positioned outside the container opening end by the distance X from the inner peripheral edge 12 of the easily-sealable seal portion 15. In this way, the inner surface material 4 has a different sealing strength between the outer surface and the inner surface.
In order to provide one sealing surface, the inner surface member 4 has a PP layer on the outer surface, as shown in FIG.
A laminated structure in which a layer of a mixture of PP and PE is provided on the inner surface is adopted.

Next, the operation of the thus constructed container lid will be described. The container lid 1 is the flange 1 of the container 100.
It is piled up on 0 and heated and pressurized in the seal area 9 by the heat bar 22 and heat-sealed to the flange 10. At this time, since the inner surface of the inner surface member 4 has a layered structure capable of being easily opened and sealed by a heat seal with respect to the surface of the flange 10, the flange 1 in the seal area 9 is formed.
0 and the inner surface material 4 are easily opened and sealed in the easily opened seal portion 15. However, between the outer surface material 3 and the inner surface material 4, since the innermost surface of the outer surface material 3 is a non-heat seal material, it is not heat sealed, and the range of the adhesive 5 becomes a tight seal portion. ing.

Next, when the container 100 sealed with the container lid 1 is retort-treated, the internal pressure of the container 100 rises and acts on the container lid 1. As shown in FIG. 4, the container lid 1 is deformed in a state of bulging outward, and the outer surface material 3 and the inner surface material 4 are sealed between the inner peripheral edge 11 of the inner surface material 4 and the point A. Since there is no gap, a gap 21 is formed between them. Therefore container 1
The internal pressure of 00 acts on the point A, and then acts in the direction of separating the outer surface material 3 and the inner surface material 4, but the tight seal portion 14 is formed between the outer surface material 3 and the inner surface material 4. Therefore, both do not peel. On the other hand, in the easy-open seal portion 15, the point A, which is the starting point of the deformation of the container lid 1, is outside the inner edge 12 of the easy-open seal portion 15 by the distance X, and A
Since the point is located in the middle of both side edges of the easy-open seal portion 15, the tensile force acting on the point A is simultaneously dispersed in a wide area of the easy-open seal portion 15, and Since stress concentration does not occur on the inner peripheral edge 12 of the unsealing seal portion 15, the easy-open sealing portion 15 also does not open due to an increase in internal pressure during the retort process. That is, the container lid 1 can maintain the airtightness of the container 100 against the retort process.

Next, when opening the container 100, as shown in FIG. 5, the edge of the container lid 1 is picked up with fingers, and the container lid 1 is peeled off from the easy-open seal portion 15. Container 10
0 can be opened.

[0016]

EFFECTS OF THE INVENTION In the container lid of the present invention, three types of contact surfaces, that is, a non-seal surface, an easily-openable seal surface, and a tight seal portion surface, are layered on the container lid. The tight seal part surface is provided adjacent to the non-seal surface that forms the gap where the pressure is most likely to act, and the seal strength is carried by the tight seal part surface, or the internal pressure is Easy-opening property that is less likely to act than the sealing surface By supporting the easy-opening property on the sealing surface, both easy-opening property and sealing strength can be achieved. Moreover, this compatibility is realized by the application technique of the adhesive agent, which is easy to perform with high precision, and it is not necessary to depend on the dimensional accuracy of the operation and positioning of the seal bar, which facilitates the manufacture of the container lid.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing a container lid according to an embodiment of the present invention.

FIG. 2 is a cross-sectional explanatory view showing a container lid in a state where the container lid is separated from the container.

FIG. 3 is an explanatory cross-sectional view showing a layer structure of a container lid.

FIG. 4 is an explanatory cross-sectional view showing a container lid in a state where internal pressure is applied.

FIG. 5 is a cross-sectional explanatory view showing a container lid at the time of peeling.

FIG. 6 is a cross-sectional explanatory view showing a conventional container lid.

[Explanation of symbols]

 1 Container Lid 3 Outer Surface Material 4 Inner Surface Material 5 Adhesive 10 Flange 11 Inner Edge 12 Inner Edge 13 Center of Container 14 Tight Seal 15 Easy-Open Seal 16 Inner Edge 17 Outer Edge 21 Gap 22 Heater

Claims (1)

[Scope of utility model registration request] 1. A container lid, which comprises an outer surface material and an inner surface material laminated to each other and is heat- sealed to an opening edge of the container in a sealing region of a peripheral portion to close the opening end portion of the container, the outer surface material Has a contour capable of covering the entire surface of the opening end of the container, and the outer surface material is made of a material whose inner side surface does not have heat sealability to the outer surface of the inner surface material, and the inner surface material is Tightly sealed by the tight seal portion using an adhesive on the inner surface of the outer surface material in a state where the inner peripheral edge of the annular member is located closer to the center of the opening end than the inner peripheral edge of the seal area. Tei Rutotomoni wherein a sealable by peelable seal portion in the seal region to the open end of the container, prior to a predetermined distance from the inner peripheral edge inner peripheral edge of the easy-open seal part of the tight seal portion <br /> Center of open end Easy-open container lid, characterized in that Riniaru.