JPS6238907Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to lids for cans and other containers for filling and sealing foods, beverages, etc., and particularly to tape seal lids.

BACKGROUND OF THE INVENTION It is well known that cans containing foods, beverages, and other articles are sometimes configured as easy-open cans that can be easily opened.

Such easy-open cans generally have a can lid with a score formed around the can body.
A pull tab is riveted to the can lid, and when the can is opened, the pull tab is pulled up to tear the can lid from the score portion. However, with such easy-open cans, after the can is opened, tear pieces and pull tabs are separated from the can body and thrown away, polluting the environment.
In order to avoid this, recently, instead of using a pull tab, an opening for taking out the contents is formed in the can lid in advance, and this opening is sealed with sealing tape. A so-called tape seal lid has been developed in which a hole is made in the seal tape or the seal tape is peeled off. In general, the structure of the adhesive surface when applying seal tape is considered to be a heat seal type adhesive surface or an adhesive sticker type adhesive surface, but there are differences in terms of the difficulty of the pasting operation, price, etc. For consideration, an adhesive sticker type adhesive surface is often used. However, while the adhesive sticker type adhesive surface has the above-mentioned advantages, it has the disadvantage of being reusable (resealable) and therefore having a low pilfer-proof function, which is the ability to guarantee the authenticity of the contents. There is. In other words, adhesive seal tape is easy to apply and peel off from the lid, but if you peel off the seal tape, open the can, and then apply the seal tape again to close the opening. Even if the can is closed, no or no obvious traces of the can being peeled off or opened are left.

For this reason, it is desired to develop a tape seal lid that also has a pilfer-proof function.

This idea was made in view of the above circumstances, and even if the sealing tape that has been peeled off is reused to close the opening of the can lid, traces of peeling will remain clearly, making it pilfer-proof. The object of the present invention is to provide a tape seal container lid that can perform its functions.

Corresponding to this purpose, the tape seal container lid of the present invention has an opening for taking out the contents in the container lid, and the opening is attached to the adhesive adhesive surface formed on the back side of the container lid. The surface of the container is sealed with adhesive tape, and the peripheral edge of the opening on the back side of the container lid and the exposed back side of the seal tape are covered with a backing layer adhered to the back side of the seal tape, and the back side is sealed. A lining layer is releasably adhered to the peripheral edge of the opening, and the adhesive strength of the adhesive portion between the lining layer and the sealing tape is greater than the adhesive strength of the adhesive portion between the lining layer and the container lid. It is characterized by its large structure.

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

In FIGS. 1, 2, and 3, 1 is a can lid, and the can lid 1 is attached at its peripheral edge to the open end flange of a can body (not shown) by means such as seaming. It is used for

The can lid 1 includes a can lid main body 2 and a sealing tape 3.

The can lid body 2 is made of tin, TFS or other metal plate,
Alternatively, it is made of a metal plate coated with a plastic material, a plastic film, or a laminated material containing a plastic film, which is usually used as a lid material.
Particularly important is that the can lid main body 2 is provided with a hole 4 for taking out the contents. This hole 4 is hermetically closed with a sealing tape 3 attached to the can lid main body 2.

The sealing tape 3 includes a main body 5 and a knob 6 integrally continuous with the main body 5. The main body 5 has dimensions that can cover the hole 4 in the can lid main body 2 and the peripheral edge 7 of the hole 4, and is attached to the can lid main body 2 with an adhesive surface 8 formed on the back surface to seal and close the hole 4. do. The adhesive surface 8 of the main body 5 adheres to the can lid main body 2 to seal and close the hole 4. In order to constitute such an adhesive type adhesive surface, a adhesive type adhesive is applied to the adhesive surface 8. Such adhesive adhesives are also called pressure-sensitive adhesives, and the main ingredients are natural rubber, butyl rubber, polyisobutylene, polyvinyl ether, ethyl acrylate, silicone rubber, etc., and commercially available ones can be used. can. However, such an adhesive type adhesion surface may be formed on the entire back surface of the main body 5, but in addition to this, it may be formed on the peripheral edge 8a of the back surface of the main body 5, that is, the peripheral edge 7 of the hole 4 of the can lid main body 2. It may be formed only in the corresponding portion, and the portion 8b corresponding to the hole 4 may be formed as another type of adhesive surface such as a heat seal type adhesive surface.

The knob portion 6 is not bonded to either.

The peripheral edge 7b of the hole 4 on the back surface of the can lid main body 2 and the back surface 8b exposed from the hole 4 of the seal tape 3 are covered with a lining layer 9. The lining layer 9 is the can lid main body 2
It has a size that can cover the peripheral edge 7b of the hole 4 on the back surface of the seal tape 3 and the back surface 8b portion of the seal tape 3. Such a backing layer 9 may be used by cutting a plastic film, or by applying plastisol to the can lid body 2.
It may be formed by applying it to the peripheral edge 7b of the hole 4 on the back surface of the seal tape 3 and the back surface 8b of the seal tape 3. However, in any case, the adhesive strength between the backing layer 9 and the back surface 8b of the seal tape 3 is greater than the adhesive strength between the backing layer 9 and the can lid body 2. Therefore, it is necessary to select the adhesive strength between the two so that when the sealing tape 3 is peeled off from the can lid main body 2, the backing layer 9 is also peeled off from the can lid main body 2 along with the sealing tape 3.
The backing layer 9 and the back surface 8 of the sealing tape 3 are adhered by the adhesive when the back surface 8 is configured as an adhesive adhesive surface, or by the adhesive when the back surface 8 is configured as a heat-sealable adhesive surface. If the adhesive surface is configured as such, it is attached by heat sealing, and if it is configured as another type of adhesive surface, it is adhered by that type.

Such a can lid 1 is completed by pasting a sealing tape 3 that cooperates with a lining layer 9 on the can lid main body 2 and sealing the hole 4, and then wrapping it around a can body (not shown) or the like. It is fixed by tightening or other means.

Next, when opening the hole 4 in the can lid 1 configured as described above, as shown in FIG. is peeled off from the can lid body 2, and the lining layer 9 is peeled off from the can lid body 2 together with the seal tape 3.

Next, if you try to close the hole 4 in the can lid body 2 again using the sealing tape 3, the portion 8a of the sealing tape 3 corresponding to the periphery of the hole 4 in the can lid body 2 will be stuck with an adhesive type. Due to the nature of the surface, it still retains its adhesiveness even after being peeled off from the can lid body 2, so it can be reattached to the can lid body, but as shown in FIG. After that, the portion 8a of the sealing tape 3 and the peripheral edge of the lining layer 8 are positioned directly opposite to each other without the can lid main body 2 being interposed therebetween. Since the backing layer 9 or the sealing tape 3 is flexible, it may not be possible to maintain a mutually facing position due to impact or wrinkles when the sealing tape 3 is peeled off from the can lid main body 2. , the portion 8a of the seal tape 3 and the peripheral edge of the backing layer 9 stick together and cover the sticking surface 8a, and can no longer be stuck to the can lid main body 2. In addition, if you try to re-attach and try to peel off the backing layer 9 from the adhesive surface 8a and pull it against the adhesion force, the seal tape 3 itself will be damaged and you will attempt to re-attach it. It leaves behind traces that indicate. In this way, the seal tape once peeled off from the can lid main body 2 cannot be reused, and thereby the can lid main body 2 can be provided with a pilfer-proof function.

In the embodiments described above, the adhesive to form the adhesive surface is applied to the sealing tape side in advance, but it is also possible to apply these adhesives to the can lid body side. Of course it's good.

[Brief explanation of the drawing]

Figure 1 is a plan view of the can lid, Figure 2 is an enlarged cross-sectional view of the - part in Figure 1, Figure 3 is an enlarged cross-sectional view of the - part in Figure 1, and Figure 4 shows the state in which the sealing tape is peeled off. An enlarged cross-sectional view and FIG. 5 are enlarged cross-sectional views showing a state in which the seal tape is reattached. 1... Can lid, 2... Can lid body, 3... Seal tape, 4... Hole, 9... Lining layer.

Claims (1)

[Claims for Utility Model Registration] (1) A sealing tape that forms an opening for taking out contents in a container lid, and adheres to the surface of the container lid with an adhesive adhesive surface formed on the back side of the opening. The peripheral edge of the opening on the back side of the container lid and the exposed back side of the sealing tape are covered with a backing layer adhered to the backside of the sealing tape, and the backing layer is attached to the opening. The container is releasably adhered to the peripheral edge of the container, and the adhesive strength of the adhesive portion between the lining layer and the seal tape is greater than the adhesive strength of the adhesive portion between the lining layer and the container lid. A tape-sealed container lid. (2) The tape seal container lid according to claim 1, wherein the lining layer is made of a plastic film or coated with plastisol.