JPH084417Y2 - Easy to open lid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention relates to an easy-open lid that can be opened without using a device such as a can opener.

"Prior Art" Fig. 5 shows a conventional easy-open lid. In this case, the plastic layer 2 is laminated on the surface side of the gas barrier material 1. As the gas barrier material 1, a composite film in which an unstretched polypropylene film is laminated on both front and back surfaces of an aluminum foil having gas barrier properties is used. The plastic layer 2 is made of polypropylene. A to-be-opened portion 4 surrounded by a weakening line 3 is formed in the center of the easy-open lid. The weakening line 3 is a portion weakly formed so as to tear when opened, and in the lid of this example, the weakening line 3 is formed by forming a groove in which the gas barrier material 1 is exposed in the plastic layer 2. The weakening line 3 divides the plastic layer 2 into the unsealed portion side plastic layer 2a and the flange side plastic layer 2b.

A tab 5 is provided on the opened portion 4 of the lid.
The tab 5 is a portion that is pulled when tearing the weakening line 3 and has a hole 6 for hooking a finger on one end side thereof. The tab 5 is formed separately from the plastic layer 2a and is fixed to the unsealed portion side plastic layer 2a by caulking using a boss, ultrasonic welding or the like.

[Problems to be solved by the invention] In such a conventional easy-open lid, when the tab 5 and the unsealed portion side plastic layer 2a are fixed due to variations in work, However, there is a problem to be solved that the tab 5 may come off from the plastic layer 2 when the tab 5 is pulled for opening.

As an easily openable lid intended to solve such a problem, the one shown in FIGS. 6 to 8 has been proposed. In this case, the unsealed portion-side plastic layer 2a is divided into two parts, that is, a cleaving plate part 15 and a cover plate part 16.
As shown in FIG. 7, the cleaving plate portion 15 is formed in a ring shape along the weakening line 3, and the tab 5 is integrally provided at one end portion thereof. The cover plate portion 16 is formed in a circular shape as shown in FIG. And this cover plate part 16
Are connected to the flange portion side plastic layer 2b at three locations through thin liner portions 23 ....

In this easy-open lid, since the rupture plate portion 15 of the plastic layer 2a to be opened and the tab 5 are integrally formed, the fixed state is strong and the tab 5 does not fall off during opening. .

However, in this easy-open lid, since the plastic layer 2b on the flange side and the cover plate portion 16 are joined by the liner portions 23 in order to reduce the number of parts, the line of weakness 3 is crossed by these liner portions 23. The liner part is
It becomes necessary to cut 23 ... And this liner part 23
In order to cut the… smoothly and comfortably,
One of these liner portions 23 ... and the tab 5 of the cleaving plate portion 10
I had to match the position of the line.

Therefore, in the above-mentioned easily-openable lid proposed above, when the cleaving plate portion 15 is attached to the integrally molded product of the flange-side plastic layer 2b and the cover plate portion 16, the position of the tab 5 becomes the above-mentioned position. As described above, it was necessary to align the positions with each other, and there was a complaint that it took time to manufacture the lid.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an easily-openable lid in which there is no fear that the tab will be removed during opening and which does not require positioning during manufacturing.

[Means for Solving the Problem] The easy-open lid of the present invention is formed into two molded products, a plastic layer on the part to be opened in which the plastic layer is surrounded by a weakening line and a plastic layer on the flange side outside the weakening line. A cleaving plate, which is separated, in which the unsealed portion side plastic layer forms at least a part of a portion in contact with a weakening line and has a hole, and a tab whose tip side is located on the hole is integrally formed on the surface. And a cover plate part that closes the hole from the back surface side of the cleave plate part, and the cleave plate part and the cover plate part are edges along the weakening line of the cleave plate part. The parts are connected to each other via a hinge.

[Operation] In this easy-open lid, the plastic layer is formed by fitting the unsealed portion side plastic layer into the ring of the flange side plastic layer.

Further, in this easily openable lid, the unsealed portion side plastic layer is formed in a state in which the hinge connecting the cleaving plate portion and the supplementary cover plate portion is opened. Then, when the hinge of this molded product is closed, the rupture plate portion and the cover plate portion naturally have a predetermined positional relationship, and the unsealed portion side plastic layer can be fitted into the ring of the flange side plastic layer.

[Embodiment] FIG. 1 shows a first embodiment of the easy-open lid of the present invention. This lid is formed by a gas barrier material 30 and a plastic layer 31 laminated on the surface thereof. The outer peripheral portion of the easy-open lid is formed in an inverted L-shaped cross section and serves as a flange portion 32. The weakening line 3 is formed on the inner peripheral side of the flange portion 32, and the inside thereof is the opened portion 33. The weakening line 3 divides the plastic layer 31 into an unsealed portion side plastic layer 31a and a flange side plastic layer 31b.

The unsealed portion side plastic layer 31a is shown in FIGS.
As shown in the figure, the cleaving plate portion 34 and the cover plate portion 35 are formed by two parts. The cleaving plate portion 34 is formed in such a shape that the outer circumference thereof is in contact with the weakening line 3 over the entire circumference and a hole 36 is provided at a position slightly deviated from the center. A thick portion (thickness of about 2 mm) is formed in an arcuate shape on the side of the cleaving plate portion 34 where the hole 36 is brought near, and this portion serves as a cleaving start end portion 38. This crack start 38 and the rest (thickness approx.
1.5 mm) is formed with hinge lines 39, 39 for improving the opening property of the lid. Again hole 36
A fitting recess 40 into which a later-described cover plate portion 35 is fitted is formed by cutting out the back side of the cleaving plate portion 34 at the periphery thereof.

A tab 41 is integrally provided on the surface of the cleaving plate portion 34. The tab 41 is provided such that the base end portion is connected to the cleaving start end portion 38 and the tip end portion side is located in the hole 36.

The supplementary cover plate portion 35 is a substantially disc-shaped member formed so as to fit in the fitting recess 40 of the cleaving plate portion 34 and has a thickness of about
It is 1 mm. On the back surface of the cover plate 35, the hinge line 4
2 is formed. The position of the hinge line 42 is substantially linear with the hinge lines 39, 39 provided on the cleaving plate portion 34 when the covering plate portion 35 is accommodated in the fitting recess 40 of the cleaving plate portion 34. Has been defined.

A part of the supplementary cover plate portion 35 is bulged to form a connecting portion 43. The connecting portion 43 is connected to the rupture starting end portion 38 of the rupturing plate portion 34 via a hinge 44, and when the connecting portion 43 is bent by the hinge 44, the connecting portion 43 also fits in the fitting recess 40.

 Next, a method for manufacturing the easy-open lid will be described.

In order to manufacture this easy-open lid, first, the gas barrier material 30
Is molded into a predetermined shape. Also, the flange portion side plastic layer 31b is injection molded, and apart from this, the unsealed portion side plastic layer 31a, that is, the cleaving plate portion 34, the tab 41, and the cover plate portion 35.
It is injection-molded as a unit with. Then, the molded unsealed portion side plastic layer 31a is bent from the hinge 44 portion as shown by an arrow A in FIG.
35 is housed in the fitting recess 40 of the cleaving plate portion 34. In this way, the hole 36 is closed from the rear surface side of the cleaving plate portion 34.

Then, after the unsealed portion side plastic layer 31a is fitted in the ring of the flange side plastic layer 31b, these are adhered to the gas barrier material 31 by a high frequency welding method or the like to obtain an easily-openable lid. It is desirable that this bonding be performed under a reduced pressure atmosphere. To open the easy-open lid, the tab 41 is pulled up. Then, the unsealed portion side plastic layer 31a is bent at the hinge lines 39, 39, 42 and the outer peripheral edge of the crush start end portion 38 is pushed down, whereby the gas barrier material 30 is crushed at the weakened line 3. Then, when the tab 41 is subsequently pulled, the gas barrier material 30 is cut along the weakening line 3 and the lid is opened.

In this easy-open lid, the tab 41 and the cleaving plate portion of the opened portion 33 are used.
Since 34 and the tab 41 are integrated, the attachment strength of the tab 41 to the cleaving plate portion 34 is extremely strong and its reliability is also high. Therefore, according to this easy-open lid, the tab 41 can be prevented from falling off when opening.

In addition, this easy-to-open lid has a plastic layer on the flange side.
31b and the unsealed portion side plastic layer 31a are separately molded, and the plastic layer 31 does not cross the weakening line 3, so that there is no obstacle to the cutting of the weakening line 3 and the tab 41 is located at any position. Even if the same opening property is obtained. Therefore, this easy-open lid is easy to manufacture because it is not necessary to determine the position of the tab 41 during manufacturing.

Furthermore, this easy-to-open lid is a plastic layer on the open side.
Since the cleaving plate part 34 and the supplemental covering plate part 35 forming the part 31a are connected to each other through the hinge 44, it is possible to avoid an increase in the number of parts. Moreover, there is an advantage that the unsealed portion side plastic layer 31a can be manufactured only by bending the hinge 44. Therefore, this easy-open lid has high productivity.

[Effect of the Invention] As described above, the easy-open lid of the present invention has two molded products, the plastic layer on the part to be opened in which the plastic layer is surrounded by the weakening line and the plastic layer on the flange side outside the weakening line. Further, the unsealed portion side plastic layer forms at least a part of a portion in contact with the weakening line and a hole is formed, and a tab whose tip end side is located on the hole is integrally formed on the surface. Formed by a cleaving plate portion and a cover plate portion that closes the hole from the back surface side of the cleaving plate portion, and the cleaving plate portion and the cover plate portion weaken the cleaving plate portion. It is characterized in that it is continuously provided via a hinge at an edge portion along the line.

In the easily-openable lid having such a configuration, the tab and the cleaving plate portion of the opened portion are integrally molded, so that the attachment strength of the tab to the cleaving plate portion is extremely strong and its reliability is also high. high. Therefore, according to the easy-open lid of the present invention, it is possible to prevent the tab from falling off when opening.

Further, in the easy-open lid of the present invention, since the flange side plastic layer and the unsealed side plastic layer are separated, the plastic layer does not cross the weakening line. Therefore, the easy-open lid of the present invention shows the same openability regardless of the position of the tab when the flange side plastic layer and the unsealed side plastic layer are combined, and the position of the tab is determined during manufacturing. It becomes unnecessary and easy to manufacture.

Further, in the easily-openable lid of the present invention, since the cleaving plate part and the supplemental covering plate part forming the plastic layer on the part to be opened are connected via the hinge, it is possible to avoid an increase in the number of parts,
Moreover, there is an advantage that the cleaving plate portion and the supplemental covering plate portion can be combined in a predetermined positional relationship only by bending the hinge portion. Therefore, the easy-open lid of the present invention has good productivity.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the easy-open lid of the present invention,
2 to 4 show the unsealed portion side plastic layer of the same embodiment, FIG. 2 is a front view, FIG. 3 is a sectional view,
FIG. 4 is a back view, FIG. 5 is a cross-sectional view showing a conventional easy-open lid, and FIG. 6 is a cross-sectional view showing the previously proposed easy-open lid.
FIG. 7 is a front view showing a pressing plate portion of the previously proposed easy-open lid, and FIG. 8 is a front view showing a flange-side plastic layer and a cover plate portion of the previously proposed easy-open lid. Is. 3 ... weakening line, 30 ... gas barrier material, 31 ... plastic layer,
31a ... Plastic layer on opened side, 31b ... Plastic layer on flange side, 33 ... Opened portion, 34 ... Cleavage plate portion, 35 ... Cover plate portion, 38 ... Cleavage start end portion, 41 ... Tab, 44 ... Hinge .

Claims (1)

[Scope of utility model registration request] 1. A plastic layer is laminated on a gas barrier material, and an opened portion surrounded by a weakening line is formed in a central portion,
In the easy-open lid in which a tab to be pulled at the time of opening is provided in the opened portion, the plastic layer is surrounded by a weakening line, and the opening-side plastic layer and the flange-side plastic layer outside the weakening line have two sides. Separated into a molded product, the unsealed portion side plastic layer forms at least a part of a portion in contact with the weakening line and a hole is formed, and a tab whose tip side is located on the hole is integrally formed on the surface Formed by a cleaving plate portion that is formed and a cover plate portion that closes the hole from the back surface side of the cleaving plate portion, and these cleaving plate portion and the cover plate portion are An easily-openable lid characterized in that it is continuously provided via a hinge at an edge portion along the weakening line.