JPH0224775Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention generally relates to a structure for preventing damage to the seal of a can with a lid, and more particularly to a structure for preventing damage to a seal of a large can such as a 5-gallon can with a lid.

The fitting part between the lid and the can body of cans with a lid is generally sealed with adhesive tape, for example with Nori and Kutsky cans, and the same thing is done with 5-gallon cans with lids. It was also practiced.

In a typical example of these cans, a headband-shaped protrusion protruding outward is provided close to the upper open end of the body wall of the can body, and an outwardly curled portion is provided at the lower edge of the side wall of the lid body. When the lid body is placed on the can body, the curled portions abut and are supported by the protrusions, and adhesive tape is applied in a headband shape over some width above and below these abutting portions. A hermetic seal was in place.

Such sealed cans provide an adequate seal when the can itself is small or contains light contents, but it is difficult to store heavy contents in a relatively large can such as a 5-gallon can. In such cases, the seals were often damaged during storage and transportation of multiple cans stacked on top of each other.

If the contents are easily deteriorated or putrefied by contact with the outside air, damage to the seal may be caused by external forces during transportation or storage, even if the damage is caused by a minute hole such as a pinhole. As the can repeatedly deforms and restores itself, it acts as a pump, drawing outside air into the can and contaminating the contents. In particular, since the use of food additives is strongly discouraged, it is desired to provide cans with undamaged seals.

The cause of failure of the seal is variable and not all of the causes have been determined; however, the failure of the hermetic seal may occur downwardly from the upper open end of the can body and protrude outward onto the barrel wall of the can body. A protrusion is provided, and the separation distance between the protrusion and the open end is set such that when the lid is placed on the can body, a sealing margin is provided between the lower edge of the side wall of the lid and the protrusion. The above-mentioned drawbacks can be greatly improved by making the protruding distance to the outside sufficient to protrude outward from the outer surface of the side wall of the lid body. I found out.

The above-mentioned features of the present invention can be combined with one or more of the other features described below to further improve seal failure prevention. The present invention will be described in more detail below with reference to the accompanying drawings.

FIG. 1 diagrammatically shows the sections of two conventional lidded cans juxtaposed with a hermetically sealed seal. The upper end of the cylindrical body wall 1 of the can body is curled outward to form an open end 11. A headband-shaped protrusion 12 is formed below the open end and protrudes outward. The lid body 2 has a top wall 21 that covers the open end 11 of the can body, and a side wall 22,
The lower edge 23 of the side wall 22 is curled outward. When the lid body 2 is placed on the can body, the lower edge 23 of the lid body is supported by abutting on the protruding part 12, and the adhesive tape 3 is applied in a headband shape over some width above and below these abutting parts. wrapped around it and sealed tightly. As can be seen from this figure, the hermetic seals of adjacent cans project outwardly from the sides of their respective cans and are susceptible to damage from friction therebetween. In addition, when such sealed cans are transported one by one by hand with a band wrapped around the vertical center, the seal may peel off or break due to the difference in distortion between the can body and the lid. In some cases, especially when the can has a rectangular horizontal cross section, distortion occurs about the diagonal axis, and damage frequently occurs at the corners of the diagonal axis.

FIG. 2 is a diagram showing the basic features of the present invention, in which the upper end of the barrel wall 1 of the can body is curled outward to form an open end 11, and a protrusion 12 protruding outward below the open end 11. The lid 2 has an open end 1 of the can body.
The can structure is identical to the conventional can structure of FIG. 1 in that it has a top wall 21 covering the can, and a side wall 22, the lower edge 23 of the side wall being curled outward. However,
The ridges 12 are spaced apart enough to provide a sealing margin 13 between the lower edge 23 of the lid and the ridges 12 of the can body when the lid 2 is placed on the can body. Furthermore, the protrusion 12 extends outwardly by a sufficient distance from the outer surface of the side wall 22 of the lid. The outward protrusion dimension of the protrusion 12 is made larger than that of conventional cans, and the protrusion 12 and the lower edge 2 of the lid body
By providing a pasting margin 13 for the seal between cans 3 and 3, the seal portion does not come into contact with adjacent cans, and its resistance to distortion is increased, so the effect of preventing breakage of the seal is greatly increased. Ru.

The protrusion 12 may be formed as a single continuous protrusion in the shape of a headband, or may be an intermittent protrusion. When forming the protrusions 12 intermittently,
If the horizontal cross-sectional shape of the can is polygonal, it is preferable to always provide a protrusion in each corner region. This increases the resistance to distortion of the can about the diagonal axis.

Various modifications of the example shown in FIG. 2 are shown at a, b, c ₁ , c ₂ and d in FIG.

In FIG. 3a, a second ridge 14 is provided above the ridge 12 of the can body and spaced downward from the open end 11. The second protrusion 14 is positioned close to the lower edge 23 of the side wall 22 of the lid body, and protrudes to the outside of the body wall 1 by a size such that it comes into pressure contact with the inner surface thereof. This eliminates the play between the can body and the lid 2, and the double protrusion of the protrusion 12 and the second protrusion 14 increases the resistance to distortion of the can due to external force. do. Moreover, there is an effect of reducing the difference in strain between the lower edge 23 of the lid body and the adhesive margin 13 of the sealing seal, and the effect of preventing damage to the seal is further increased.

In FIG. 3b, the curled portion at the lower edge 23 of the lid is press-molded so as to be flush with the outer surface of the side wall 22 of the lid, and the inner surface of the curled portion protrudes inward. . As a result, the lower edge 23 of the lid is tightly fitted and engaged with the lower side of the second protrusion 14, increasing the tightness between the lid 2 and the body wall 1 of the can body. The effect of preventing damage to the seal due to the difference in strain is further improved. Furthermore, the outer surface of the lower edge 23 of the lid body is aligned with the outer surface of the side wall 22, and there is a difference in level between the sealing margin on the side wall 22 of the lid body and the pasting margin 13 on the body wall. As the difference in tension of the seal 3 decreases,
Therefore, there is an effect of preventing damage due to a strain difference between the lid body 2 and the can body.

Figures c ₁ and c ₂ show a specific example in which the outer surface of the sealing margin 13 of the body wall is aligned with the outer surface of the side wall 22 of the lid and its lower edge 23. It shows. In these embodiments, the seal 3 is under uniform tension throughout, and is therefore more effective in preventing damage due to strain differences between the lid 2 and the can body.

In Fig. 3d, the outer surface of the sealing margin 13 of the body wall is the side wall 22 of the lid body and its lower edge 2.
3 shows a specific example in which it protrudes outward from the outer surface of No. 3. In general, damage to the seal 3 due to strain differences between the lid 2 and the can body is caused by outward strain on the side wall 22 of the lid, especially its lower edge 23, and outward strain on the can body portion adjacent thereto. This is often due to the difference between In the example shown in Figure 3d,
The seal portion bonded to the side wall 22 and the outer surface of the lower edge 23 of the lid body is under less tension than the seal portion bonded to the sealing margin 13, and therefore the above-mentioned strain difference is When this happens, the effect of preventing damage to the seal 3 is even more excellent.

Furthermore, in the specific example shown in Fig. 3 c ₁ and d,
A lower edge 23 protruding inwardly from the side wall 22 of the lid body.
However, the second protrusion 14 and the sealing margin 13
It is compressed and fitted into a groove 15 formed between the two.
The ridges 12, the second ridges 14 and the grooves 15 further increase the resistance to deformation of the can and thus prevent the hermetic seal 3 from breaking.

In each of the above embodiments, the curled lower edge 23 of the side wall 22 of the lid body is pressed so that at least its outer surface becomes flat, thereby imparting strong tension to the seal 3 partially. This is effective in preventing breakage.

[Brief explanation of drawings]

Fig. 1 is a diagrammatic diagram showing the parts of two conventional lidded cans juxtaposed with a hermetically sealed seal;
Schematic diagram similar to the figure, Figure 3 a, b, c ₁ , c ₂ , d
1 is a partial schematic diagram showing an embodiment combining various other features of the present invention; FIG. Explanation of symbols: 1... Body wall of can body, 2... Lid, 3... Sealing seal, 11... Open end of can body, 12... Projection, 13... On body wall of sealing seal. Pasting allowance, 14...Second protrusion, 15...Groove, 2
1...Top wall of the lid body, 22...Side wall of the lid body, 23...
...lower edge of side wall.

Claims (1)

[Claims for Utility Model Registration] (1) A can body having a bottom wall and a cylindrical body wall with an open end formed above, a top wall covering the open end, and a top wall that covers the open end. a lid body having a side wall extending downward from the peripheral edge along the outer surface of the body wall of the can body, and after the lid body is placed on the can body, the side wall of the lid body and the body of the can body are In a can with a lid that forms a headband-like seal between the can body and the wall, a protrusion is provided on the body wall that is spaced downwardly from the open end of the can body and projects outward; b The separation distance between the protrusion and the open end is such that when the lid is placed on the can body, there is enough space for a seal to be applied between the lower edge of the side wall of the lid and the protrusion. (c) The protruding distance to the outside of the protrusion is such that when the lid is placed over the can body, the protrusion protrudes sufficiently outward from the outer surface of the side wall of the lid. Features a structure that prevents damage to the sealed cans with lids. (2) In the can with a lid set forth in claim 1 of the utility model registration claim, a. a second protrusion protruding from the can body; and b, the separation distance between the second protrusion and the open end is such that when the lid is placed on the can body, it is close to the lower edge of the side wall of the lid. (c) The distance by which the second protrusion protrudes outward is such that when the lid is placed over the can body, it is pressed into contact with the inner surface of the side wall of the lid; A hermetic seal for cans with a lid that prevents breakage. (3) In the can with a lid set forth in claim 2 of the utility model registration claim, a) it has a curled part wound outwardly on the lower edge of the side wall of the lid, and b the outer surface of the curled part. are press-molded so that they are flush with the outer surface of the side wall of the lid body, and the inner surface of the curled portion protrudes inward; c. A hermetic seal breakage prevention structure for a can with a lid, characterized in that the arrangement and dimensions are such that the curled part protruding inward is tightly fitted. (4) In the can with a lid set forth in any one of claims 1 to 3 of the claims for utility model registration, a. A structure for preventing breakage of a seal for a can with a lid, characterized in that a sealing margin between the side edge and the protrusion is aligned on the same plane. (5) In the can with a lid set forth in any one of claims 1 to 3 of the claims for utility model registration, a. A seal breakage prevention structure for a can with a lid, characterized in that a pasting allowance for the seal protrudes from the outer surface of the lower edge. (6) In the can with a lid set forth in claim 3 of the utility model registration claim, a. A groove is formed between the pasting allowance and the groove for receiving the curled part protruding inwardly, and b the curled part protruding inwardly at the lower edge of the side wall of the lid body is tightly fitted into the groove. A seal breakage prevention structure for a can with a lid, characterized in that: (c) a pasting allowance for the seal is extended outward from an outer surface of the side wall of the lid.