JPS6038513Y2 - Pull-open tab - Google Patents

Description

[Detailed description of the invention] This invention relates to a tab used for a pull oven type container lid.

Pull-open containers that are easy to open are widely used in drinking water cans and other applications.

The lid used for this pull-open container is usually made of aluminum or tinplate, and the surface of the lid has a score to give it tearability. A tab made of tin or the like is attached.

The tab is generally attached to the lid by plastically working the lid to form a button, and then riveting the metal tab to the button.

When opening or opening the can, the tab is pulled up using the riveted part as a fulcrum, and an initial break is caused at the starting point of the score on the lid body at a specific point called a point such as the tip of the tab on the opposite side of the fulcrum, and then the tab is pulled up. Pull up and tear the lid along the score to open the can.

However, in recent years, due to demands for resource conservation and price reduction, instead of the above-mentioned rigid metal containers, single-layer or multi-layer plastic materials, plastic materials and metal foils such as aluminum foil, tin foil, steel foil, etc. It is conceivable that semi-rigid containers or soft three-dimensional containers made of composite materials laminated in multiple layers with paper and/or paper materials may be used for beverage cans, snacks, and other purposes, and at the same time, such semi-rigid containers or For soft three-dimensional containers, it is conceivable to use a tab made of the same kind of material as mentioned above.

In this case as well, a score for cutting is formed on the container lid and a corresponding tab is attached, but it is quite difficult to open or open the can.

In other words, even such semi-rigid containers or flexible three-dimensional containers need to withstand a certain level of drop strength when filled with contents, and must also withstand the internal pressure generated when the contents are sterilized by heating. It is also necessary to withstand the negative pressure generated in the head space of the can or container when the hot filled contents are cooled, so it is impossible to increase the depth of the score beyond a certain limit. be.

Therefore, even if the tab is completely welded to the lid, or even if it is firmly attached to the lid with a strong adhesive, the score will not be damaged unless the starting point of the score is first punctured to cause initial destruction. An easy and smooth pull-open along is not possible.

However, for tabs made of flexible plastic materials or composite materials made of laminated plastic materials, metal foil, and/or paper materials, it is necessary to drill holes at the starting points of such scores to give initial failure. For this reason, it is desired to develop a pull-open tab that is made of plastic or composite material and that can provide initial breakage by drilling at the starting point of the score.

This idea was made in view of the above circumstances, and although it is made of plastic material or a composite material made of laminated plastic material and metal foil and/or paper material, it still does not require drilling at the starting point of the score. The object of the present invention is to provide a tab that can be easily and smoothly pulled open.

Corresponding to this purpose, the pull-open tab of the present invention includes a tab body made of a multilayer composite material to be attached to the lid body at the joint point, and a tab body located before and after the joint point of the tab body. It is characterized by comprising a reinforcement material that is included and connected between the layers of the main body.

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 tab, which is arranged on the surface of the lid body 2, and is located at a joint point O in the middle of the longitudinal direction.
It is attached to the lid body 2.

The tab 1 includes a tab body 3.

The tab body 3 is made of a single-layer or multi-layer plastic material, or a composite material made of laminated plastic material, metal foil, and/or paper material, and is cut into a desired shape.

Commercially available materials can be used as such materials.

A reinforcing member 4 is provided in the tab body 3. Reinforcement material 4 is at junction O
It is located longitudinally through the central part of the tab body 3 and is included between any layers of the material constituting the tab body 3 or attached to the surface of the tab body 3.

As will be described later, this reinforcing material 4 functions as a member for perforating the starting point of the score 5 of the lid body 2 and providing initial destruction. It is necessary to select the material and dimensions so as to maintain rigidity against the bending stress caused by the force required for the initial failure of the reinforcing material 4. Examples of such reinforcing material 4 include metal wire, metal rod,
Alternatively, as shown in Fig. 4, a narrow metal plate or a hard plastic rod can be used, especially a metal plate with a diameter of 0.2 mm.
Ordinary iron wire of 5TrrIn to 1.07rrIn or 0.
2rIr! A common steel plate with a thickness of n~0.4m+y+ is suitable.

When manufacturing the tab 1, these reinforcing bars 4 are embedded in the material constituting the tab 1, as shown in FIGS. 3 and 5.
Alternatively, it is pasted onto the surface of the material and then punched out into a tab shape using a punch die or the like.

The tab 1 is bonded to the lid 2 at the joint O.

The bonding may be done using an adhesive, but at least one of the lid body 2 and the tab body 3 of the tab 1 may be made of a thermofusible plastic material, or at least one surface layer may be made of a thermofusible plastic layer. When the tab 1 is made of a multilayer plastic material or a composite material, the plastic on the surface layer of the material may be melted by heat using a heating device such as high frequency heating, and then bonded under pressure. 2 may be sutured.

In the lid body 2 using the tab 1 configured in this way, when the lid body 2 is opened, as shown in FIG. The tip P of score 4 is displaced downward and presses down the starting point of score 5, and eventually that part is perforated and initial failure occurs.

If the tab 1 is pulled up further after this initial destruction occurs, the lid 2 attached to the tab 1 will be torn along the score 5 and opened.

As is clear from the above explanation, according to this invention, the container lid and pull-open tab are constructed of a single-layer or multi-layer plastic material, or a composite material made of a laminated layer of plastic material, metal foil, and/or paper material. In some cases, the starting point of the score can also be perforated to provide an initial failure, thus obtaining a tab that allows easy and smooth pull-opening.

[Brief explanation of the drawings] Figure 1 is a plan view showing the state in which the tab is attached to the container lid;
Figure 2 is a plan view of the tab, Figure 3 is ■-■ in Figure 2.
Fig. 4 is a plan view of a tab according to another example, Fig. 5 is a sectional view taken along the line -V in Fig. 4, and Fig. 6 is an explanatory longitudinal sectional view showing the tab in use. 1...Tab, 2...Additive, 3...
...Tab body, 4...Reinforcement, 5...Score

Claims (2)

[Scope of utility model registration request] (1) A tab body made of a multilayer composite material that is to be attached to the lid body at the joint point, and a reinforcing material that is located across the front and back of the joint point of the tab body and is included and connected between the layers of the tab body. A pull-open tab characterized by comprising: (2) The reinforcing material is a metal wire, metal rod, narrow metal plate, or plastic material configured to maintain rigidity against bending stress caused by the force necessary for initial failure of the score part of the lid body. A pull oven tab according to claim 1 of the utility model registration claim, characterized in that: