JPS6242897Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Purpose of the invention [Field of industrial application] This invention relates to lids for cans and other containers for filling and sealing foods, beverages, etc., particularly easy-open lids.

[Conventional technology]

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.
In addition, a pull tab is riveted to the can lid, and when the can is opened, the can lid is pulled up and the can lid is torn from the score part, so that the can can be opened.

[Problem that the invention attempts to solve]

However, in such easy-open cans, the pull tab is separated from the can body and thrown away after the can is opened, polluting the environment. An opening for taking out the contents is formed in advance in the can, and this opening is sealed by pasting a sealing tape, and when opening the can, a hole is made in the sealing tape or the sealing tape is peeled off. Seal lids have been developed. Since this tape seal lid does not use a metal pull tab, there is no problem of environmental pollution caused by a discarded pull tab after use.

However, since the tape seal lid closes the opening only by the attached seal tape, its strength is low and its range of application is relatively narrow. In addition, in the case of this tape seal lid, it is possible to reseal it by peeling off the tape seal lid, opening it, and then pasting the tape seal lid again to make it appear unused. There were also problems.

From this point of view, the conventional metal tear open with tear pieces defined by scores has a wide range of applications and has excellent properties. However, even in such tear-open type lids, thinning is being considered in response to requests for resource conservation, but the problem remains that the presence of scores reduces the strength of the lid.

This idea was made in view of the above circumstances, and while maintaining the advantages of the tear-open lid, it does not use a metal pull tab and reinforces weak parts such as the score. It is an object of the present invention to provide a container lid that can be made thinner.

(b) Structure of the invention [Means for solving the problem] Corresponding to this purpose, the tear-open container lid of this invention includes a lid member that includes a tear piece along at least a part of the outline of the tear piece for tearing the hole. forming a weak part, and adhering a film-like pull tab piece including a plastic layer to the surface of the lid member corresponding to the tear piece and the weak part, the pull tab piece being a main body to be stuck to the tear piece; The pull tab piece includes a knob located at one end of the pull tab piece, and a connecting part located on the opposite side of the knob across the main body, and the adhesion strength between the pull tab piece and the tear piece is set as described above. The breaking strength is greater than the breaking strength of the weak part, and the adhesion strength of the connecting part is made greater than the adhesion strength of the remaining part of the part of the pull tab other than the main body that is attached to the lid body. It is characterized by

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 is made of a material normally used for a lid body, such as tin plate, TFS or other metal plate, a metal plate coated with plastic material, or a plastic film or a laminated material containing a plastic film. has been done. This can lid 1 is integrally equipped with a tear piece 3 that is torn when opening the hole 2 (FIG. 6) for taking out the contents. A weak portion 4 such as a score or slit is formed along the line.

A pull tab 5 is attached to the outer peripheral edge 9 of the tear piece 3 and the weakened portion 4. The pull tab 5 is made of plastic film or a commercially available laminate material containing plastic film, aluminum foil, or steel foil, and includes a connecting portion 6, a main body 7, and a knob portion 8 integrally and continuously. The knob 8 is folded back and located on the upper side of the main body 7. The connecting portion 6 is located on the opposite side of the knob portion 8 across the main body 7.

The main body 7 includes the tear piece 3, the weak part 4, and the weak part 4 of the can lid 1.
cover the outer peripheral edge 9 of and adhere to them. In this case, the adhesion strength between the tear strip 3 and the adhesive surface 12 of the corresponding portion 11 of the pull tab 5 is as follows:
The adhesion strength should be greater than that of the adhesion surface 13 of No.9. Furthermore, it is particularly important that the adhesion strength between the tear piece 3 and the adhesion surface 12 be greater than the breaking strength of the weak portion 4. In other words, the relationship between the adhesion strength between the tear piece 3 and the adhesive surface 12 and the breaking strength of the weak portion 4 is such that when the pull tab 5 is pulled up, the tear piece 3 is attached to the adhesive surface 12.
2, the tear piece 3 is pulled up along with the pull tab 5, and as a result, the weak portion 4 is destroyed and the tear piece 3 is separated from the can lid 1. In order to realize such a relationship, the adhesive surface 12 may be a heat-seal adhesive surface, and the adhesive surface 13 may be configured as an adhesive adhesive surface. In such a case, a heat seal adhesive is applied to the adhesive surface 12 and an adhesive adhesive is applied to the adhesive surface 13 to form a heat seal adhesive surface and an adhesive adhesive surface. .

Heat-sealable adhesives are adhesives that are bonded by heating and fusing, and are heated and bonded using a heating source such as a hot plate, an impulse energizing device, an ultrasonic vibration device, or other heater, and then pressurized. The main ingredients of such heat-sealable adhesives include polyvinyl acetate,
Polyvinyl alcohol, polyvinyl acetal and other commercially available products may also be utilized.

The adhesive type adhesive is also referred to as a pressure-sensitive type adhesive, and natural rubber, butyl rubber, polyisobutylene, polyvinyl ether, ethyl acrylate, silicone rubber, and other commercially available adhesives can be used as the main ingredient.

When the main body 7 is peeled off from the can lid 1, the connecting portion 6 is attached to the can lid 1 to prevent the pull tab 5 and tear piece 3 from dispersing.
Therefore, the adhesive surface 14 of the connecting portion 6 is the adhesive surface 13
It is desirable to use a material with greater adhesion force than the above, for example, a heat-sealed surface.

[Effect]

When opening a can using a can lid configured in this way, first, in order to provide an initial perforation if necessary, the tear piece 3 of the can lid 1 is opened near the starting end 17 of the weak portion 4 of the tear piece 3. (The part indicated by the chain line in FIG. 1) is pressed from above the pull tab 5. This pressure causes the fourth
As shown in the figure, the starting end portion of the weak portion 4 is perforated. clearly indicating the position near the starting end 17 to be pressed;
In addition, in order to facilitate the pressing operation, a button 1 having a shape suitable for pressing is attached to the tear piece 3, as shown in FIG.
8 may be formed protrudingly.

Next, when the knob 8 is pinched and the pull tab 5 is pulled up, the adhesion between the outer peripheral edge 9 of the can lid 1 and the adhesive surface 13 is peeled off, and the pull tab 5 is angularly displaced around the connecting portion 6. Rise. The tear piece 3 rises accompanying this rising pull tab 5, and the weak portion 4 is torn to open the can.

(c) Effect of the invention In such tear-open container lids, the can lid does not have an opening for taking out the contents in advance, and the contents are basically isolated by the can lid itself. This ensures that the contents are protected.
Furthermore, it is economical as it does not use metal tab rings. Furthermore, since the tear pieces can be attached to the can lid together with the flexible pull tab even after the can is opened, there is no pollution of the environment due to their dissipation, and waste materials such as tear pieces can be easily collected. Furthermore, since the flexible pull tab functions to reinforce weak points such as the score of the can lid, it is possible to form the score deeply to make tearing opening easier, or to prevent thinning of the can lid. It is possible to meet the demands of scarce resources.

In addition, the pull tab has a larger shape than the tear piece, and when the tear piece is torn open, the flexible pull tab wraps around the periphery of the tear piece, making it difficult to drink the contents. It is safe because there is no risk of damaging the pull tab, and it is also safe to recover the pull tab if it is scattered outside.

(d) Description of other embodiments What is shown in FIG. 7 is a tear-open container lid according to another embodiment of this invention. In the tear-open container lid according to the embodiment shown in FIG. 7, the slit 20 and the weak portion 4 are formed along the outline of the tear piece 3 of the can lid 1'. Part 3 on the opposite side of the
No slits or weak portions are formed in 0, therefore, in this portion 30, the tear piece 3 and the outer peripheral edge 9 are continuous without a boundary. The state of the open can in the tear-open container lid constructed in this way is as follows.
As shown in the figure, since a slit 20 that penetrates the can lid 1 is formed in a part of the outline of the tear piece 3, there is no need to form an initial hole, which makes opening the can easier. Since the portion 30 is continuous and functions as a hinge when the can is opened, the tear piece 3 does not separate from the can lid 1'.

In addition, in the embodiments described above, the respective adhesives for forming the adhesive-type adhesive surface and the heat-sealable adhesive surface are to be applied to the sealing tape side in advance, but these adhesives Of course, it may be applied to the can lid body side.

[Brief explanation of the drawing]

Figure 1 is an explanatory 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 is a state in which initial perforation is provided. FIG. 5 is a cross-sectional partial explanatory view showing a part of the tear piece, FIG. 6 is an enlarged cross-sectional explanatory view showing a state in which the pull tab is peeled off, and FIG.
The figure is an explanatory plan view of a can lid according to another embodiment, and FIG. 8 is an explanatory cross-sectional view showing the state of the can lid shown in FIG. 7 when the can is opened. 1, 1'... Can lid, 3... Tear piece, 4... Weak part, 5... Pull tab.

Claims (1)

[Scope of utility model registration request] A film-like pull tab piece having a weak part formed along at least a part of the contour of a tear piece for tear perforation in the lid member, and comprising a plastic layer on the surface of the lid member corresponding to the tear piece and the weak part. and the pull tab piece includes a main body that is attached to the tear piece, a knob located at one end of the pull tab piece, and a connecting part located on the opposite side of the knob across the main body. and the adhesion strength between the pull tab piece and the tear piece is made greater than the breaking strength of the weak part, and the connecting part of the part of the pull tab other than the main body that is adhered to the lid body. A tear-open container lid body characterized in that the adhesion strength of the part is greater than the adhesion strength of the remaining part.