JPH04124967U - Easy-open container lid - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] It is possible to obtain an easy-to-open container lid that can achieve both easy-to-open properties and seal strength, and is easy to manufacture. [Structure] The container lid 1 has three types of adhesive surfaces:
3: seal surface, easy-open seal surface 15, tight seal surface 14
A tight-sealing surface 14 is provided adjacent to the non-sealing surface that forms the gap where pressure is most likely to act, and the tight-sealing surface 14 is provided in the layer structure of the container lid 1 to increase the sealing strength. The sealing surface 14 supports the sealing surface, or the easy-opening sealing surface 15, on which internal pressure acts less easily than the non-sealing surface, supports the easy-opening property. [Effect] The easy-to-open container lid can achieve both ease of opening and seal strength. Moreover, we achieved both of these using adhesive application technology that is easy to perform with high precision.
Since there is no need to depend on the dimensional accuracy of the operation and positioning of the container lid, manufacturing of the container lid becomes easier.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is related to container lids, especially for molded containers for storing food and other items. This invention relates to an easy-to-open container lid that is sealed by means such as the above.

0002

[Conventional technology]

In recent years, cup containers and tray containers that use at least a portion of plastic materials have become popular. Containers are used as sealed storage containers for food and other items. like this Containers are lightweight, have the same shelf life as cans and bottles, and are low-cost and resource-saving. It is widely used because it meets the requirements and is easy to handle. One of the most important requirements for ease of handling is ease of opening. This kind of capacity Demand for easy-to-open container lids that can be opened easily with just your fingers without the need for other tools There are many points.

0003 General technology and technology to achieve easy-opening of such easy-open container lids. The strength of the seal of the lid against the container is reduced to the extent that it can be opened with just your fingers. It is possible that On the other hand, containers that have been filled and sealed must be recorded. It is necessary to perform tort treatment, but during this retort treatment, the inside of the container is heated. As the internal pressure increases, the strength of the seal between the container and the lid will depend on the strength of the internal pressure during retort processing. It must be durable. To prevent peeling of the seal between the container and the lid. The pressure resistance (seal strength) is set at 2.3 kg or more for a 15 mm width, which is quite high. . Therefore, it is extremely difficult to achieve both ease of opening and seal strength.

0004 For example, as a container lid that has both seal strength and easy opening, There is one shown in No. 3-294368. The technique described in JP-A No. 63-294368 is as shown in FIG. A lid 101 that is sealed at 100 is composed of an outer material 102 and an inner material 103, The material 102 and the inner material 103 are sealed at a tight seal portion 104 with high sealing strength. The inner material 103 and the container 100 have an easy-to-open seal portion 1 with low sealing strength. 05, and the inner peripheral edge 106 of the easily openable seal portion 105 is a tight seal. located closer to the center 112 of the container opening 111 than the inner peripheral edge 107 of the round portion 104. It is configured so that With this configuration, considering the deformation of the lid 101, , the internal pressure during retort is mainly in the tight seal part 1 rather than in the easy-open seal part 105. 04, but due to the high sealing strength of the tight seal portion 104, the lid 101 is Peeling is prevented and the specified seal strength can be satisfied. On the other hand, container 100 When opening the lid 101, pick up the outer edge of the lid 101 with your fingers, and the lower The easy-to-open seal portion 105 having sealing strength is peeled off, and the container 100 is opened. This container lid has both seal strength and ease of opening, making it an easy-to-open container lid. It has remarkable technical effects.

[0005]

[Problem that the idea aims to solve]

However, in the above technique, the easy-open seal portion 105 is damaged due to the internal pressure during retorting. In order to avoid peeling, the inner peripheral edge 10 of the easy-to-open seal portion 105 must be 6 is located closer to the center of the container opening end 111 than the inner peripheral edge 107 of the tight seal portion 104. Strict control of dimensional accuracy is required to ensure the seal bar is positioned in the desired position. There is a problem that a high-precision mechanism is required for positioning, making the manufacturing of container lids complicated. Countermeasures for these points are desired.

[0006] This idea was made in view of the above circumstances, and it is easy to open and seal. To provide an easy-to-open container lid that is both strong and easy to manufacture. It is an object.

[0007]

[Means to solve the problem]

In response to this purpose, the easy-to-open container lid of this invention has an outer material and an inner material laminated together. The container is sealed to the opening edge of the container in a peripheral sealing area to prevent the container from opening. A container lid that closes a mouth end, wherein the outer surface material covers the entire surface of the opening edge of the container. The outer surface material has a contour that can cover the outer surface material, and the inner surface of the outer surface material is in contact with the outer surface of the inner surface material. The inner material is made of a material that does not have heat-sealing properties, and the inner material is a ring covering the sealing area. The inner peripheral edge is located closer to the center of the opening end than the inner peripheral edge of the sealing area. When forming a tight seal part using an adhesive on the inner surface of the outer material in the state of The open end of the container is sealed by an easy-to-open seal portion in the seal area. possible, and the inner periphery of the easy-to-open seal portion is further away than the inner periphery of the tight seal portion. It is characterized by being located near the center of the opening end.

[0008]

[Effect]

The internal pressure during retort causes the lid to bulge outward, causing the gap between the inner and outer materials and the inner material to It acts in the direction of separating the container and the container. The inner edge of the easy-to-open seal is a tight seal. - Since it is located closer to the center than the inner peripheral edge of the seal part, the beginning of the bulging deformation of the lid is at the tight seal part. It becomes the inner periphery of. However, this peeling progresses and reaches the inner periphery of the tight seal. However, since the peeling strength of the tight seal part is high, the peeling does not progress any further. Satisfies the specified peel strength during retorting.

[0009] On the other hand, when opening the lid of a container, if you pick up the outer edge of the lid with your fingers, it will lower the lid. The easy-to-open seal portion with sealing strength is peeled off and the container is opened. In this way, - Ensures both strength and ease of opening.

0010

【Example】

The details of this invention will be explained below with reference to the drawings showing one embodiment. 1 and 2, 1 is a container lid, and the upper surface of the flange 10 of the container 100. The opening end of the container 100 is sealed by being attached to the seal area 9 having a width W of . The container lid 1 includes an outer surface material 3 and an inner surface material 4 that are laminated together.

[0011] The outer material 3 has a substantially circular shape that can cover both the opening of the container 100 and the entire surface of the flange 10. Has a shape outline. The outer material 3 satisfies the performance as a container lid, such as protecting the contents from external forces. For example, as shown in Figure 3, a structure with such strength is A laminated layer consisting of a layer of PET, a layer of Al, a layer of PP, a layer of PET, etc. It has a laminated structure. It is particularly important that the innermost surface of the outer material 3 The structure has a non-heat sealing property that does not allow good heat sealing with the outer surface of material 4. It is necessary to In order to provide this non-heat sealing property, the outer material 3 shown in Fig. 3 is The inner surface is composed of the above-mentioned PET layer.

0012 The inner surface material 4 forms an annular body extending over the sealing area 9, and the inner peripheral edge 11 thereof is a sealing area 9. It is located closer to the center 13 of the container than the inner peripheral edge 12 of the area 9. Inner material 4 is a seal In region 9, a tight seal portion 14 is formed on the outer surface material 3 using adhesive 5. , and on the inner surface, the flange 10 of the container 100 has an easy-to-open seal part 15. Has an tamper seal. Here, the tight seal part has a seal strength that will not peel off due to internal pressure during retort. The easy-open seal has a lower peel strength than the tight seal. This is a seal that has the strength to peel off with regular finger pressure. However, the adhesive 5 is not provided over the entire area of the seal area 9; There is no adhesive 5 in the portion 9a of width X near the inner peripheral edge of the seal area 9, so the seal In the seal area 9, the tight seal portion 14 between the outer surface material 3 and the inner surface material 4 is in the seal region 9. 9 to the inner peripheral edge 16 of the adhesive 5 (point A). Therefore Thailand The inner peripheral edge 16 of the seal portion 14 is a distance X from the inner peripheral edge 12 of the easy-open seal portion 15. located outside the open end of the container. The inner surface material 4 has an outer surface and an inner surface like this. In order to provide two sealing surfaces with different sealing strengths, the inner surface material 4 must have a As an example, as shown in Figure 3, the outer surface has a PP layer, and the inner surface has a layer of PP and PE. Adopts a laminate structure with layers of mixture.

[0013] Next, the operation of the container lid configured in this way will be explained. The container lid 1 is stacked on the flange 10 of the container 100 and sealed by the heat bar 22. It is heated and pressurized in the seal area 9 and heat-sealed to the flange 10. At this time, the inner surface of the inner material 4 is heat-sealed against the surface of the flange 10. Since the layer structure allows for an easy-to-open seal, there is no flange in the seal area 9. The jacket 10 and the inner surface material 4 are easily sealed at an easy-open seal portion 15. but , between the outer material 3 and the inner material 4, since the innermost surface of the outer material 3 is a non-heat seal material. The adhesive 5 is not heat-sealed, and the area of the adhesive 5 is a tight seal.

[0014] Next, when the container 100 sealed with the container lid 1 is retorted, the contents of the container 100 are Pressure increases and acts on the container lid 1. The container lid 1 bulges outward as shown in Figure 4. The outer material 3 and the inner material 4 are deformed from the inner peripheral edge 11 of the inner material 4 to point A. Since the space between the two is not sealed, a gap 21 is created between the two. So the container 100 of internal pressure acts on point A, and then the direction in which the outer material 3 and the inner material 4 are separated However, a tight seal portion 14 is formed between the outer material 3 and the inner material 4. so the two do not separate. On the other hand, regarding the easy-open seal portion 15, the container lid 1 is deformed. Point A, which is the starting point of Since point A is located in the middle of both side edges of the easy-to-open seal portion 15, point A The tensile force acting on the is simultaneously dispersed over a wide area of the easy-to-open seal portion 15. Therefore, stress concentration does not occur on the inner peripheral edge 12 of the easy-open seal portion 15, so that it is easy to open. The seal portion 15 is also not unsealed due to an increase in internal pressure during retort processing. In other words, capacity The lid 1 can keep the container 100 airtight for retort processing.

[0015] Next, when opening the container 100, as shown in FIG. When the container lid 1 is picked up with It can be opened.

[0016]

[Effect of the idea]

The container lid of this invention has three types of contact surfaces: a non-sealing surface and an easy-to-open seal. Three types of contact surfaces, a seal surface and a tight seal surface, are provided in the layered structure of the container lid to ensure maximum pressure. A tight seal surface is provided adjacent to the non-seal surface that forms a gap where force easily acts. , the seal strength is carried by the tightly sealed surface, or the internal pressure acts more than the non-sealed surface. Easy-openability and strong sealing by supporting easy-openability on the hard-to-open sealing surface. It is possible to balance both degrees. Moreover, this can be achieved by using an adhesive that is easy to apply with high precision. This is achieved using coating technology, and does not require dependence on the dimensional accuracy of seal bar operation and positioning. Since there is no need for this, manufacturing of the container lid becomes easier.

[Brief explanation of drawings]

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

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

FIG. 3 is an explanatory cross-sectional view showing the layered structure of the container lid.

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

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

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

[Explanation of symbols]

1 Container lid 3 Exterior material 4 Inner material 5 Adhesive 10 Flange 11 Inner periphery 12 Inner periphery 13 Center of container 14 Tight seal part 15 Easy-open seal part 16 Inner periphery 17 Outer rim 21 Gap 22 Heat bar

Claims (1)

[Scope of utility model registration request] 1. A container lid comprising a laminated outer material and an inner surface material and sealed to the opening edge of the container in a peripheral sealing area to close the opening end of the container, The outer surface material has a contour capable of covering the entire surface of the opening edge of the container, and the inner surface of the outer surface material is made of a material that does not have heat-sealability to the outer surface of the inner surface material. The inner surface material constitutes an annular body extending over the sealing area, and an adhesive is applied to the inner surface of the outer surface material with the inner peripheral edge being located closer to the center of the opening end than the inner peripheral edge of the sealing area. is used to form a tight seal part, and can be sealed to the open end of the container by an easy-to-open seal part in the seal area, and the inner peripheral edge of the easy-to-open seal part is An easy-open container lid, characterized in that the tight seal portion is located closer to the center of the opening end than the inner peripheral edge of the tight seal portion.